/* roulang page: index */
/* ===================== 设计变量 ===================== */
:root{
  --ink:#111514;
  --ink-2:#2A312F;
  --paper:#F5F3EC;
  --paper-2:#EBE7DC;
  --line:#D8D3C7;
  --muted:#6E746F;
  --brand:#1F5C55;
  --brand-2:#2F7A70;
  --signal:#D9F24F;
  --danger:#B3402E;
  --success:#2F6F4E;
  --dark:#0E1211;
  --dark-text:#F5F3EC;
  --r-xs:2px;
  --r-sm:4px;
  --r-md:8px;
  --r-lg:12px;
  --shadow:0 12px 32px rgba(17,21,20,.08);
  --ease:cubic-bezier(.2,.7,.2,1);
  --max:1200px;
}

/* ===================== reset / base ===================== */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
  font-size:16px;
  line-height:1.8;
  font-weight:400;
  color:var(--ink);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,p,ul,ol,figure,blockquote{margin:0;}
ul,ol{padding:0;list-style:none;}
a{color:inherit;text-decoration:none;}
img{max-width:100%;display:block;}
button,input,select,textarea{font:inherit;color:inherit;}
button{background:none;border:none;cursor:pointer;}
table{border-collapse:collapse;width:100%;}
svg{display:block;}
:focus-visible{outline:2px solid var(--signal);outline-offset:2px;}
::selection{background:var(--signal);color:var(--ink);}

/* ===================== 容器 ===================== */
.container{
  width:100%;
  max-width:var(--max);
  margin:0 auto;
  padding:0 32px;
}

/* ===================== 头部导航 ===================== */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:rgba(245,243,236,.94);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.header-inner{
  display:flex;
  align-items:center;
  gap:20px;
  height:76px;
}
.logo{display:flex;align-items:center;gap:10px;flex:0 0 auto;}
.logo-mark{
  width:38px;height:38px;
  display:grid;place-items:center;
  background:var(--ink);
  color:var(--paper);
  border-radius:var(--r-sm);
  transition:background .2s var(--ease),transform .2s var(--ease);
}
.logo:hover .logo-mark{background:var(--brand);transform:translateY(-1px);}
.logo-text{display:flex;flex-direction:column;line-height:1.15;}
.logo-text strong{font-size:16px;font-weight:800;letter-spacing:-.01em;}
.logo-text em{font-style:normal;font-size:11px;letter-spacing:.2em;color:var(--muted);}

.main-nav{
  display:flex;
  align-items:center;
  gap:2px;
  margin-left:auto;
}
.main-nav a{
  position:relative;
  padding:8px 12px;
  font-size:14.5px;
  font-weight:500;
  color:var(--ink-2);
  border-radius:var(--r-sm);
  white-space:nowrap;
  transition:color .2s var(--ease),background .2s var(--ease);
}
.main-nav a:hover{color:var(--brand);background:var(--paper-2);}
.main-nav a:active{transform:translateY(1px);}
.main-nav a.active{color:var(--ink);font-weight:700;}
.main-nav a.active::after{
  content:"";
  position:absolute;
  left:12px;right:12px;bottom:1px;
  height:2px;
  background:var(--signal);
  border-radius:2px;
}
.header-actions{display:flex;align-items:center;gap:14px;flex:0 0 auto;}
.btn-text{
  font-size:14.5px;
  font-weight:600;
  color:var(--ink-2);
  padding:6px 2px;
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.btn-text:hover{color:var(--brand);border-bottom-color:var(--brand);}

/* ===================== 按钮 ===================== */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  height:48px;
  padding:0 24px;
  border-radius:var(--r-sm);
  font-size:15px;
  font-weight:600;
  line-height:1;
  border:1px solid transparent;
  cursor:pointer;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease);
}
.btn .arrow{transition:transform .2s var(--ease);}
.btn:hover .arrow{transform:translateX(3px);}
.btn:active{transform:translateY(1px);}
.btn-primary{background:var(--ink);color:var(--signal);border-color:var(--ink);}
.btn-primary:hover{background:var(--signal);color:var(--ink);}
.btn-signal{background:var(--signal);color:var(--ink);border-color:var(--signal);}
.btn-signal:hover{background:var(--ink);color:var(--signal);border-color:var(--ink);}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line);}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand);background:rgba(31,92,85,.05);}
.btn-block{width:100%;}
.btn[disabled],.btn.is-disabled{opacity:.45;cursor:not-allowed;pointer-events:none;}
.btn-sm{height:44px;padding:0 20px;font-size:14.5px;}
.btn.is-loading{pointer-events:none;opacity:.7;}

/* ===================== 通用板块 ===================== */
.section{padding:88px 0;}
.section--tight{padding:56px 0;}
.section--paper2{background:var(--paper-2);}
.section--dark{background:var(--dark);color:var(--dark-text);}
.section-head{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:32px;
  margin-bottom:44px;
  flex-wrap:wrap;
}
.section-head h2{
  font-size:clamp(28px,3.6vw,44px);
  line-height:1.15;
  font-weight:800;
  letter-spacing:-.02em;
}
.section-head p{
  max-width:520px;
  margin-top:12px;
  font-size:15px;
  color:var(--muted);
}
.section--dark .section-head p{color:rgba(245,243,236,.72);}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:12px;
  font-weight:700;
  letter-spacing:.18em;
  color:var(--brand);
  margin-bottom:18px;
}
.eyebrow::before{
  content:"";
  width:22px;height:1px;
  background:var(--brand);
}
.link-more{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-size:14.5px;
  font-weight:600;
  color:var(--brand);
  padding-bottom:4px;
  border-bottom:1px solid transparent;
  transition:border-color .2s var(--ease),gap .2s var(--ease);
}
.link-more:hover{border-bottom-color:var(--brand);gap:10px;}

/* ===================== 徽章 / 标签 ===================== */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  height:26px;
  padding:0 10px;
  font-size:12px;
  font-weight:600;
  letter-spacing:.04em;
  border:1px solid var(--line);
  border-radius:999px;
  color:var(--ink-2);
  background:var(--paper);
}
.tag-signal{background:var(--signal);border-color:var(--signal);color:var(--ink);}
.tag-dark{background:transparent;border-color:rgba(245,243,236,.32);color:var(--dark-text);}

/* ===================== 首屏 ===================== */
.hero{
  padding:64px 0 48px;
  border-bottom:1px solid var(--line);
  background:
    radial-gradient(circle at 12% 0%,rgba(31,92,85,.06),transparent 46%),
    var(--paper);
}
.hero-grid{
  display:grid;
  grid-template-columns:7fr 5fr;
  gap:48px;
  align-items:stretch;
}
.hero-copy{display:flex;flex-direction:column;justify-content:center;}
.hero h1{
  font-size:clamp(34px,4.4vw,56px);
  line-height:1.06;
  letter-spacing:-.02em;
  font-weight:800;
  margin-bottom:24px;
}
.hero h1 .h1-kw{display:inline-block;}
.hero-sub{
  font-size:17px;
  color:var(--ink-2);
  max-width:460px;
  margin-bottom:32px;
}
.hero-actions{
  display:flex;
  align-items:center;
  gap:14px;
  flex-wrap:wrap;
  margin-bottom:36px;
}
.hero-note{
  font-size:13px;
  color:var(--muted);
  display:flex;
  align-items:center;
  gap:8px;
}
.hero-note .dot{
  width:6px;height:6px;border-radius:50%;
  background:var(--success);
}

.hero-visual{
  position:relative;
  display:flex;
  flex-direction:column;
  justify-content:space-between;
  gap:20px;
  min-height:460px;
  padding:26px;
  border-radius:var(--r-md);
  overflow:hidden;
  background-image:url('/assets/images/backpic/back-1.png');
  background-size:cover;
  background-position:center;
  color:var(--dark-text);
}
.hero-visual::before{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,rgba(14,18,17,.30) 0%,rgba(14,18,17,.88) 100%);
}
.hero-visual > *{position:relative;z-index:1;}
.hv-top{display:flex;justify-content:flex-end;}
.hv-badge{
  display:inline-flex;
  align-items:center;
  gap:8px;
  height:30px;
  padding:0 12px;
  font-size:12px;
  font-weight:600;
  letter-spacing:.06em;
  border:1px solid rgba(245,243,236,.34);
  border-radius:999px;
  background:rgba(14,18,17,.42);
  backdrop-filter:blur(6px);
}
.hv-card{
  margin-top:auto;
  display:flex;
  gap:14px;
  align-items:center;
  padding:14px;
  border-radius:var(--r-md);
  background:rgba(245,243,236,.10);
  border:1px solid rgba(245,243,236,.22);
  backdrop-filter:blur(8px);
}
.hv-card img{
  width:76px;height:76px;
  object-fit:cover;
  border-radius:var(--r-sm);
  background:var(--paper-2);
  flex:0 0 auto;
}
.hv-card-body strong{display:block;font-size:15px;font-weight:700;margin-bottom:2px;}
.hv-card-body span{font-size:13px;line-height:1.6;color:rgba(245,243,236,.76);}
.hv-cta{margin-top:4px;}
.hv-cta .btn{width:100%;}

/* 数据条 */
.hero-stats{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:0;
  margin-top:56px;
  border-top:1px solid var(--line);
}
.stat{
  display:flex;
  align-items:baseline;
  gap:14px;
  padding:22px 24px 0 0;
}
.stat + .stat{padding-left:24px;border-left:1px solid var(--line);}
.stat-num{
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  font-size:13px;
  font-weight:700;
  letter-spacing:.1em;
  color:var(--brand);
}
.stat-label{font-size:14.5px;font-weight:600;color:var(--ink-2);}

/* ===================== 权益阶梯 ===================== */
.tier-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.tier{
  display:flex;
  flex-direction:column;
  gap:16px;
  padding:40px 32px;
  border-right:1px solid var(--line);
  transition:background .2s var(--ease),transform .2s var(--ease);
}
.tier:last-child{border-right:none;}
.tier:hover{background:var(--paper-2);}
.tier-top{display:flex;align-items:center;justify-content:space-between;gap:12px;}
.tier-num{
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  font-size:13px;
  font-weight:700;
  letter-spacing:.12em;
  color:var(--muted);
}
.tier-name{font-size:22px;font-weight:800;letter-spacing:-.01em;}
.tier-for{font-size:14px;color:var(--muted);}
.tier-list{display:flex;flex-direction:column;gap:10px;margin-top:4px;}
.tier-list li{
  position:relative;
  padding-left:18px;
  font-size:14.5px;
  line-height:1.7;
  color:var(--ink-2);
}
.tier-list li::before{
  content:"";
  position:absolute;
  left:0;top:11px;
  width:7px;height:1px;
  background:var(--brand-2);
}
.tier .btn{margin-top:auto;align-self:flex-start;}
.tier-featured{
  background:var(--ink);
  color:var(--paper);
}
.tier-featured:hover{background:var(--ink);}
.tier-featured .tier-name{color:var(--paper);}
.tier-featured .tier-for{color:rgba(245,243,236,.66);}
.tier-featured .tier-num{color:rgba(245,243,236,.55);}
.tier-featured .tier-list li{color:rgba(245,243,236,.86);}
.tier-featured .tier-list li::before{background:var(--signal);}
.tier-featured .btn-ghost{color:var(--paper);border-color:rgba(245,243,236,.34);}
.tier-featured .btn-ghost:hover{background:var(--signal);color:var(--ink);border-color:var(--signal);}

/* ===================== 对比表格 ===================== */
.table-shell{
  border:1px solid var(--line);
  border-radius:var(--r-md);
  background:#fff;
  overflow:hidden;
}
.table-scroll{overflow-x:auto;}
.compare-table{min-width:820px;font-size:15px;}
.compare-table th,
.compare-table td{
  padding:16px 20px;
  text-align:left;
  border-bottom:1px solid var(--line);
  vertical-align:middle;
}
.compare-table thead th{
  background:var(--paper-2);
  font-size:12.5px;
  font-weight:700;
  letter-spacing:.1em;
  color:var(--muted);
  white-space:nowrap;
}
.compare-table thead th.is-reco{
  background:var(--ink);
  color:var(--signal);
}
.compare-table tbody th{
  width:200px;
  font-weight:600;
  color:var(--ink-2);
  background:#fff;
  position:sticky;
  left:0;
  z-index:1;
  border-right:1px solid var(--line);
}
.compare-table tbody tr:hover th,
.compare-table tbody tr:hover td{background:var(--paper-2);}
.compare-table tbody tr:last-child th,
.compare-table tbody tr:last-child td{border-bottom:none;}
.compare-table td{color:var(--ink-2);}
.cell-mark{color:var(--success);font-weight:700;}
.cell-dim{color:var(--muted);}

/* ===================== 最新信息（CMS 区） ===================== */
.post-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:24px;
}
.post-card{
  display:flex;
  flex-direction:column;
  border:1px solid var(--line);
  border-radius:var(--r-md);
  background:var(--paper);
  overflow:hidden;
  transition:transform .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.post-card:hover{
  transform:translateY(-2px);
  border-color:var(--brand);
  box-shadow:var(--shadow);
}
.post-cover{
  position:relative;
  aspect-ratio:16/9;
  background:var(--paper-2);
  overflow:hidden;
}
.post-cover img{
  width:100%;height:100%;
  object-fit:cover;
  transition:transform .24s var(--ease);
}
.post-card:hover .post-cover img{transform:scale(1.02);}
.post-cover .tag{
  position:absolute;
  left:12px;top:12px;
  background:rgba(245,243,236,.94);
  backdrop-filter:blur(4px);
}
.post-body{
  display:flex;
  flex-direction:column;
  gap:10px;
  padding:20px;
  flex:1;
}
.post-title{
  font-size:17px;
  font-weight:700;
  line-height:1.5;
  display:-webkit-box;
  -webkit-line-clamp:2;
  -webkit-box-orient:vertical;
  overflow:hidden;
}
.post-card:hover .post-title{text-decoration:underline;text-underline-offset:4px;text-decoration-thickness:1px;}
.post-summary{
  font-size:14px;
  line-height:1.75;
  color:var(--muted);
  display:-webkit-box;
  -webkit-line-clamp:2;
  -webkit-box-orient:vertical;
  overflow:hidden;
}
.post-foot{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  margin-top:auto;
  padding-top:8px;
  font-size:12.5px;
  color:var(--muted);
}
.post-arrow{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:26px;height:26px;
  border:1px solid var(--line);
  border-radius:50%;
  transition:transform .2s var(--ease),background .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease);
}
.post-card:hover .post-arrow{transform:translateX(3px);background:var(--ink);color:var(--signal);border-color:var(--ink);}
.empty-state{
  grid-column:1/-1;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:14px;
  padding:56px 24px;
  border:1px dashed var(--line);
  border-radius:var(--r-md);
  text-align:center;
  color:var(--muted);
}
.empty-state svg{color:var(--brand-2);}
.empty-state p{font-size:15px;}

/* ===================== 限时入口（深色） ===================== */
.band-grid{
  display:grid;
  grid-template-columns:7fr 5fr;
  gap:48px;
  align-items:center;
}
.band-grid h2{
  font-size:clamp(28px,3.4vw,40px);
  line-height:1.16;
  font-weight:800;
  letter-spacing:-.02em;
  margin:16px 0 14px;
}
.band-grid p{font-size:15px;color:rgba(245,243,236,.74);max-width:520px;}
.band-meta{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-top:24px;
}
.band-right{
  display:flex;
  align-items:center;
  gap:20px;
  flex-wrap:wrap;
  justify-content:flex-end;
}
.qr-box{
  width:104px;height:104px;
  display:grid;
  place-items:center;
  border:1px solid rgba(245,243,236,.26);
  border-radius:var(--r-md);
  background:
    repeating-linear-gradient(45deg,rgba(245,243,236,.10) 0 6px,transparent 6px 12px),
    rgba(245,243,236,.05);
  color:rgba(245,243,236,.7);
  font-size:12px;
  letter-spacing:.06em;
  text-align:center;
  line-height:1.5;
}

/* ===================== 咨询表单 ===================== */
.consult-grid{
  display:grid;
  grid-template-columns:5fr 7fr;
  gap:48px;
  align-items:start;
}
.consult-info h2{
  font-size:clamp(28px,3.4vw,40px);
  line-height:1.16;
  font-weight:800;
  letter-spacing:-.02em;
  margin-bottom:16px;
}
.consult-info > p{font-size:15px;color:var(--muted);max-width:420px;}
.consult-points{display:flex;flex-direction:column;gap:18px;margin-top:32px;}
.consult-points li{
  display:flex;
  gap:14px;
  align-items:flex-start;
  padding-bottom:18px;
  border-bottom:1px solid var(--line);
}
.consult-points li:last-child{border-bottom:none;padding-bottom:0;}
.cp-index{
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  font-size:12px;
  font-weight:700;
  letter-spacing:.1em;
  color:var(--brand);
  padding-top:3px;
}
.cp-body strong{display:block;font-size:15px;font-weight:700;margin-bottom:2px;}
.cp-body span{font-size:14px;color:var(--muted);line-height:1.7;}

.form-card{
  border:1px solid var(--line);
  border-radius:var(--r-md);
  background:#fff;
  padding:32px;
}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:20px;}
.field{margin-bottom:20px;}
.field label{
  display:block;
  font-size:14px;
  font-weight:600;
  margin-bottom:8px;
  color:var(--ink-2);
}
.field .req{color:var(--danger);margin-left:2px;}
.input,.select,.textarea{
  width:100%;
  height:48px;
  padding:0 14px;
  border:1px solid var(--line);
  border-radius:var(--r-sm);
  background:var(--paper);
  font-size:15px;
  color:var(--ink);
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease),background .2s var(--ease);
}
.select{appearance:none;background-image:none;cursor:pointer;}
.textarea{
  height:auto;
  min-height:124px;
  padding:12px 14px;
  line-height:1.7;
  resize:vertical;
}
.input:hover,.select:hover,.textarea:hover{border-color:var(--brand-2);}
.input:focus,.select:focus,.textarea:focus{
  outline:none;
  background:#fff;
  border-color:var(--brand);
  box-shadow:0 0 0 3px rgba(31,92,85,.12);
}
.input::placeholder,.textarea::placeholder{color:#9AA09B;}
.field.has-error .input,
.field.has-error .select,
.field.has-error .textarea{border-color:var(--danger);}
.err-msg{
  display:none;
  margin-top:6px;
  font-size:13px;
  color:var(--danger);
}
.field.has-error .err-msg{display:block;}
.checkbox-row{
  display:flex;
  align-items:flex-start;
  gap:10px;
  font-size:14px;
  color:var(--muted);
  line-height:1.7;
}
.checkbox-row input{
  width:18px;height:18px;
  margin-top:4px;
  accent-color:var(--brand);
  flex:0 0 auto;
  cursor:pointer;
}
.form-foot{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  flex-wrap:wrap;
  margin-top:8px;
}
.form-foot small{font-size:12.5px;color:var(--muted);max-width:320px;line-height:1.6;}
.form-msg{
  display:none;
  margin-top:18px;
  padding:12px 16px;
  border-radius:var(--r-sm);
  font-size:14px;
  border:1px solid transparent;
}
.form-msg.is-success{
  display:block;
  background:rgba(47,111,78,.08);
  border-color:rgba(47,111,78,.32);
  color:var(--success);
}
.form-msg.is-error{
  display:block;
  background:rgba(179,64,46,.07);
  border-color:rgba(179,64,46,.3);
  color:var(--danger);
}

/* ===================== FAQ ===================== */
.faq-wrap{
  display:grid;
  grid-template-columns:5fr 7fr;
  gap:48px;
  align-items:start;
}
.faq-intro h2{
  font-size:clamp(28px,3.4vw,40px);
  line-height:1.16;
  font-weight:800;
  letter-spacing:-.02em;
  margin-bottom:14px;
}
.faq-intro p{font-size:15px;color:var(--muted);max-width:380px;}
.faq-intro .btn{margin-top:24px;}
.faq-list{border-top:1px solid var(--line);}
.faq-item{border-bottom:1px solid var(--line);}
.faq-q{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  width:100%;
  padding:22px 0;
  text-align:left;
  font-size:18px;
  font-weight:600;
  color:var(--ink);
  transition:color .2s var(--ease);
}
.faq-q:hover{color:var(--brand);}
.faq-icon{
  flex:0 0 28px;
  width:28px;height:28px;
  display:grid;place-items:center;
  border:1px solid var(--line);
  border-radius:50%;
  color:var(--ink-2);
  transition:transform .2s var(--ease),background .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease);
}
.faq-item.is-open .faq-icon{
  transform:rotate(45deg);
  background:var(--signal);
  border-color:var(--signal);
  color:var(--ink);
}
.faq-a{
  max-height:0;
  overflow:hidden;
  transition:max-height .28s var(--ease);
}
.faq-a p{
  padding:0 60px 22px 0;
  font-size:15px;
  line-height:1.85;
  color:var(--muted);
}

/* ===================== 页脚 ===================== */
.site-footer{
  background:var(--dark);
  color:var(--dark-text);
  border-top:1px solid rgba(245,243,236,.14);
  padding:72px 0 0;
}
.footer-grid{
  display:grid;
  grid-template-columns:2fr 1fr 1fr 1fr;
  gap:40px;
  padding-bottom:48px;
}
.footer-logo{display:flex;align-items:center;gap:10px;margin-bottom:16px;}
.footer-logo .logo-mark{background:var(--signal);color:var(--ink);}
.footer-logo .logo-text strong{color:var(--dark-text);}
.footer-logo .logo-text em{color:rgba(245,243,236,.55);}
.footer-brand p{
  font-size:14px;
  line-height:1.8;
  color:rgba(245,243,236,.66);
  max-width:340px;
}
.footer-col h4{
  font-size:13px;
  font-weight:700;
  letter-spacing:.14em;
  color:rgba(245,243,236,.5);
  margin-bottom:16px;
}
.footer-col ul{display:flex;flex-direction:column;gap:10px;}
.footer-col li{font-size:14px;color:rgba(245,243,236,.74);line-height:1.7;}
.footer-col a{
  position:relative;
  display:inline-block;
  transition:color .2s var(--ease);
}
.footer-col a::after{
  content:"";
  position:absolute;
  left:0;bottom:-2px;
  width:0;height:1px;
  background:var(--signal);
  transition:width .22s var(--ease);
}
.footer-col a:hover{color:var(--signal);}
.footer-col a:hover::after{width:100%;}
.footer-bottom{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  flex-wrap:wrap;
  padding:22px 0;
  border-top:1px solid rgba(245,243,236,.14);
  font-size:12.5px;
  color:rgba(245,243,236,.5);
}

/* ===================== 动效 ===================== */
.js .reveal{
  opacity:0;
  transform:translateY(12px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
.js .reveal.is-in{opacity:1;transform:none;}

/* ===================== 移动导航 ===================== */
.nav-toggle{
  display:none;
  width:44px;height:44px;
  align-items:center;
  justify-content:center;
  border:1px solid var(--line);
  border-radius:var(--r-sm);
  color:var(--ink);
  transition:border-color .2s var(--ease),background .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--brand);background:var(--paper-2);}
.nav-toggle span{
  position:relative;
  display:block;
  width:18px;height:2px;
  background:currentColor;
  transition:background .2s var(--ease);
}
.nav-toggle span::before,
.nav-toggle span::after{
  content:"";
  position:absolute;
  left:0;
  width:18px;height:2px;
  background:currentColor;
  transition:transform .22s var(--ease);
}
.nav-toggle span::before{top:-6px;}
.nav-toggle span::after{top:6px;}
.nav-toggle.is-open span{background:transparent;}
.nav-toggle.is-open span::before{transform:translateY(6px) rotate(45deg);}
.nav-toggle.is-open span::after{transform:translateY(-6px) rotate(-45deg);}
.nav-mask{
  position:fixed;
  inset:0;
  background:rgba(17,21,20,.45);
  opacity:0;
  visibility:hidden;
  transition:opacity .22s var(--ease),visibility .22s var(--ease);
  z-index:65;
}
.nav-mask.is-open{opacity:1;visibility:visible;}

/* ===================== 1200 ===================== */
@media (max-width:1200px){
  .container{padding:0 28px;}
  .hero-grid{gap:36px;}
  .main-nav a{padding:8px 10px;font-size:14px;}
  .header-actions{gap:10px;}
}

/* ===================== 992 ===================== */
@media (max-width:992px){
  .section{padding:72px 0;}
  .hero{padding:48px 0 40px;}
  .hero-grid{grid-template-columns:1fr;gap:36px;}
  .hero-visual{min-height:360px;}
  .hero-stats{grid-template-columns:1fr;margin-top:40px;border-top:1px solid var(--line);}
  .stat{padding:16px 0;}
  .stat + .stat{padding-left:0;border-left:none;border-top:1px solid var(--line);}
  .tier-grid{grid-template-columns:1fr;border-bottom:none;}
  .tier{border-right:none;border-bottom:1px solid var(--line);padding:32px 24px;}
  .post-grid{grid-template-columns:repeat(2,1fr);}
  .band-grid{grid-template-columns:1fr;gap:32px;}
  .band-right{justify-content:flex-start;}
  .consult-grid,.faq-wrap{grid-template-columns:1fr;gap:32px;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:36px;}
  .main-nav{
    position:fixed;
    top:0;right:0;
    width:min(330px,86vw);
    height:100vh;
    height:100dvh;
    margin-left:0;
    padding:88px 22px 32px;
    display:flex;
    flex-direction:column;
    align-items:stretch;
    gap:2px;
    background:var(--paper);
    border-left:1px solid var(--line);
    transform:translateX(102%);
    transition:transform .26s var(--ease);
    overflow-y:auto;
    z-index:70;
  }
  .main-nav.is-open{transform:translateX(0);}
  .main-nav a{
    padding:14px 12px;
    font-size:16px;
    border-bottom:1px solid var(--line);
    border-radius:0;
  }
  .main-nav a:hover{background:transparent;color:var(--brand);}
  .main-nav a.active::after{
    left:auto;right:12px;top:50%;
    bottom:auto;
    width:6px;height:6px;
    margin-top:-3px;
    border-radius:50%;
    background:var(--signal);
  }
  .nav-toggle{display:flex;}
  .btn-text{display:none;}
}

/* ===================== 768 ===================== */
@media (max-width:768px){
  .container{padding:0 20px;}
  .header-inner{height:68px;gap:12px;}
  .logo-mark{width:34px;height:34px;}
  .logo-text strong{font-size:15px;}
  .logo-text em{font-size:10px;letter-spacing:.16em;}
  .header-actions .btn-nav{padding:0 16px;font-size:14px;height:42px;}
  .section{padding:56px 0;}
  .section-head{margin-bottom:28px;gap:16px;}
  .hero h1{font-size:clamp(30px,6.4vw,40px);line-height:1.12;margin-bottom:18px;}
  .hero-sub{font-size:15.5px;margin-bottom:26px;}
  .hero-actions{gap:10px;margin-bottom:26px;}
  .hero-actions .btn{flex:1 1 auto;}
  .post-grid{grid-template-columns:1fr;}
  .form-row{grid-template-columns:1fr;gap:0;}
  .form-card{padding:24px;}
  .faq-q{font-size:16.5px;padding:18px 0;}
  .faq-a p{padding-right:20px;font-size:14.5px;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px;}
  .compare-table tbody th{position:static;border-right:none;}
  .qr-box{width:88px;height:88px;font-size:11px;}
}

/* ===================== 480 ===================== */
@media (max-width:480px){
  .container{padding:0 16px;}
  .header-actions .btn-nav span.btn-label{display:none;}
  .header-actions .btn-nav{padding:0 14px;}
  .hero-stats .stat{gap:10px;}
  .stat-label{font-size:14px;}
  .tier{padding:26px 18px;}
  .tier-name{font-size:20px;}
  .btn{width:100%;}
  .btn-inline{width:auto;}
  .hero-actions .btn{width:100%;}
  .form-foot{flex-direction:column;align-items:stretch;}
  .form-foot .btn{width:100%;}
  .footer-grid{grid-template-columns:1fr;}
  .footer-bottom{flex-direction:column;align-items:flex-start;}
  .hv-card{flex-direction:column;align-items:flex-start;}
  .hv-card img{width:100%;height:120px;}
}

/* ===================== 降低动效 ===================== */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .js .reveal{opacity:1;transform:none;}
}

/* roulang page: category1 */
:root{
  --ink:#111514;
  --ink-2:#2A312F;
  --paper:#F5F3EC;
  --paper-2:#EBE7DC;
  --line:#D8D3C7;
  --muted:#6E746F;
  --brand:#1F5C55;
  --brand-2:#2F7A70;
  --signal:#D9F24F;
  --danger:#B3402E;
  --success:#2F6F4E;
  --dark:#0E1211;
  --dark-text:#F5F3EC;
  --r-sm:2px;
  --r-md:8px;
  --r-lg:12px;
  --shadow:0 12px 32px rgba(17,21,20,.08);
  --ease:cubic-bezier(.2,.7,.2,1);
  --header-h:76px;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
  font-size:16px;
  line-height:1.8;
  color:var(--ink);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
}
body.nav-locked{overflow:hidden;}
img{display:block;max-width:100%;height:auto;}
a{color:var(--brand);text-decoration:none;transition:color .2s var(--ease);}
a:hover{color:var(--brand-2);}
h1,h2,h3,h4{margin:0;font-weight:800;letter-spacing:-.01em;line-height:1.2;color:var(--ink);}
p{margin:0;}
ul,ol{margin:0;padding:0;list-style:none;}
button{font-family:inherit;font-size:inherit;cursor:pointer;}
:focus-visible{outline:2px solid var(--signal);outline-offset:2px;border-radius:2px;}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px;}

/* ---------- header ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:rgba(245,243,236,.92);
  backdrop-filter:saturate(140%) blur(8px);
  border-bottom:1px solid var(--line);
}
.header-inner{
  display:flex;
  align-items:center;
  gap:24px;
  height:var(--header-h);
}
.logo{
  display:flex;
  align-items:center;
  gap:10px;
  color:var(--ink);
  flex-shrink:0;
}
.logo:hover{color:var(--ink);}
.logo-mark{
  display:grid;
  place-items:center;
  width:38px;
  height:38px;
  border:1px solid var(--ink);
  border-radius:var(--r-md);
  color:var(--ink);
  transition:background .2s var(--ease),color .2s var(--ease);
}
.logo:hover .logo-mark{background:var(--ink);color:var(--signal);}
.logo-text{display:flex;flex-direction:column;line-height:1.15;}
.logo-text strong{font-size:16px;font-weight:800;letter-spacing:.01em;}
.logo-text em{font-style:normal;font-size:11px;letter-spacing:.22em;color:var(--muted);}
.main-nav{
  display:flex;
  align-items:center;
  gap:6px;
  margin-left:auto;
}
.main-nav a{
  position:relative;
  display:inline-block;
  padding:8px 12px;
  font-size:15px;
  color:var(--ink-2);
  border-radius:var(--r-sm);
  white-space:nowrap;
  transition:color .2s var(--ease),background .2s var(--ease);
}
.main-nav a::after{
  content:"";
  position:absolute;
  left:12px;
  right:12px;
  bottom:2px;
  height:2px;
  background:var(--signal);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .22s var(--ease);
}
.main-nav a:hover{color:var(--ink);background:var(--paper-2);}
.main-nav a:hover::after{transform:scaleX(1);}
.main-nav a.active{color:var(--ink);font-weight:700;}
.main-nav a.active::after{transform:scaleX(1);}
.header-actions{display:flex;align-items:center;gap:12px;flex-shrink:0;}
.btn-text{
  font-size:15px;
  color:var(--ink-2);
  padding:8px 4px;
  border-bottom:1px solid transparent;
}
.btn-text:hover{color:var(--ink);border-bottom-color:var(--ink);}
.nav-toggle{
  display:none;
  width:44px;
  height:44px;
  padding:0;
  border:1px solid var(--line);
  border-radius:var(--r-md);
  background:transparent;
  position:relative;
}
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after{
  content:"";
  position:absolute;
  left:50%;
  width:18px;
  height:2px;
  background:var(--ink);
  transform:translateX(-50%);
  transition:transform .22s var(--ease),opacity .22s var(--ease);
}
.nav-toggle span{top:50%;margin-top:-1px;}
.nav-toggle span::before{top:-6px;}
.nav-toggle span::after{top:6px;}
.nav-toggle.is-open span{background:transparent;}
.nav-toggle.is-open span::before{transform:translateX(-50%) translateY(6px) rotate(45deg);}
.nav-toggle.is-open span::after{transform:translateX(-50%) translateY(-6px) rotate(-45deg);}
.nav-scrim{
  position:fixed;
  inset:0;
  background:rgba(17,21,20,.42);
  opacity:0;
  pointer-events:none;
  transition:opacity .22s var(--ease);
  z-index:70;
}
.nav-scrim.is-open{opacity:1;pointer-events:auto;}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  height:48px;
  padding:0 22px;
  border:1px solid transparent;
  border-radius:var(--r-sm);
  font-size:15px;
  font-weight:700;
  letter-spacing:.02em;
  cursor:pointer;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .12s var(--ease);
}
.btn:active{transform:translateY(1px);}
.btn .arrow{display:inline-block;transition:transform .2s var(--ease);}
.btn:hover .arrow{transform:translateX(3px);}
.btn-primary{background:var(--ink);color:var(--signal);border-color:var(--ink);}
.btn-primary:hover{background:var(--signal);color:var(--ink);border-color:var(--signal);}
.btn-signal{background:var(--signal);color:var(--ink);border-color:var(--signal);}
.btn-signal:hover{background:var(--ink);color:var(--signal);border-color:var(--ink);}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line);}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand);background:var(--paper-2);}
.btn-sm{height:40px;padding:0 16px;font-size:14px;}
.btn-nav{height:44px;padding:0 18px;}
.btn-block{width:100%;}
.btn[disabled],.btn.is-disabled{opacity:.45;cursor:not-allowed;pointer-events:none;}

/* ---------- badges & pills ---------- */
.badge{
  display:inline-flex;
  align-items:center;
  gap:6px;
  height:24px;
  padding:0 10px;
  font-size:12px;
  font-weight:700;
  letter-spacing:.04em;
  border:1px solid var(--line);
  border-radius:999px;
  color:var(--ink-2);
  background:var(--paper);
}
.badge-signal{background:var(--signal);border-color:var(--signal);color:var(--ink);}
.badge-brand{background:transparent;border-color:var(--brand);color:var(--brand);}
.badge-dark{background:var(--ink);border-color:var(--ink);color:var(--signal);}
.pills{display:flex;flex-wrap:wrap;gap:10px;}
.pill{
  display:inline-flex;
  align-items:center;
  gap:6px;
  height:38px;
  padding:0 16px;
  font-size:14px;
  color:var(--ink-2);
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:999px;
  transition:border-color .2s var(--ease),color .2s var(--ease),background .2s var(--ease);
}
.pill:hover{border-color:var(--brand);color:var(--brand);background:var(--paper-2);}
.pill.active{background:var(--ink);border-color:var(--ink);color:var(--paper);}

/* ---------- breadcrumb ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-size:13px;
  color:var(--muted);
  padding:20px 0 0;
}
.breadcrumb a{color:var(--muted);}
.breadcrumb a:hover{color:var(--brand);}
.breadcrumb span.sep{opacity:.6;}
.breadcrumb .current{color:var(--ink-2);font-weight:600;}

/* ---------- page hero ---------- */
.page-hero{
  position:relative;
  padding:28px 0 48px;
  border-bottom:1px solid var(--line);
  background:linear-gradient(180deg,var(--paper) 0%,var(--paper-2) 100%);
}
.hero-grid{
  display:grid;
  grid-template-columns:1.12fr .88fr;
  gap:48px;
  align-items:center;
  margin-top:24px;
}
.hero-eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:12px;
  letter-spacing:.2em;
  color:var(--brand);
  font-weight:700;
  margin-bottom:16px;
}
.hero-eyebrow::before{content:"";width:26px;height:2px;background:var(--brand);}
.page-hero h1{
  font-size:clamp(32px,4.6vw,56px);
  line-height:1.08;
  letter-spacing:-.02em;
  margin-bottom:18px;
}
.page-hero h1 .accent{color:var(--brand);}
.hero-lead{
  font-size:17px;
  line-height:1.85;
  color:var(--ink-2);
  max-width:56ch;
  margin-bottom:24px;
}
.hero-meta{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-bottom:26px;
}
.hero-figure{
  position:relative;
  border:1px solid var(--line);
  border-radius:var(--r-md);
  overflow:hidden;
  background:var(--paper-2);
}
.hero-figure img{
  width:100%;
  aspect-ratio:4/3;
  object-fit:cover;
  transition:transform .4s var(--ease);
}
.hero-figure:hover img{transform:scale(1.02);}
.hero-figure figcaption{
  position:absolute;
  left:14px;
  bottom:14px;
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:6px 12px;
  font-size:12px;
  font-weight:700;
  color:var(--paper);
  background:rgba(14,18,17,.78);
  border-radius:999px;
  letter-spacing:.03em;
}

/* ---------- sections ---------- */
.section{padding:72px 0;}
.section-tight{padding:48px 0;}
.section-head{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:24px;
  margin-bottom:36px;
  flex-wrap:wrap;
}
.section-head h2{font-size:clamp(26px,3.2vw,40px);line-height:1.15;}
.section-head p{color:var(--muted);font-size:15px;margin-top:10px;max-width:60ch;}
.section-kicker{
  display:block;
  font-size:12px;
  letter-spacing:.22em;
  font-weight:700;
  color:var(--brand);
  margin-bottom:10px;
}

/* ---------- split layout ---------- */
.split{
  display:grid;
  grid-template-columns:minmax(0,7fr) minmax(0,5fr);
  gap:36px;
  align-items:start;
}

/* ---------- steps timeline ---------- */
.timeline{position:relative;}
.step{
  position:relative;
  display:grid;
  grid-template-columns:64px minmax(0,1fr);
  gap:20px;
  padding:0 0 34px;
  border-bottom:1px dashed var(--line);
  margin-bottom:34px;
}
.step:last-child{border-bottom:0;margin-bottom:0;padding-bottom:0;}
.step-num{
  display:grid;
  place-items:center;
  width:64px;
  height:64px;
  border:1px solid var(--line);
  border-radius:var(--r-md);
  background:var(--paper);
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:20px;
  font-weight:700;
  color:var(--brand);
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.step:hover .step-num{background:var(--ink);color:var(--signal);border-color:var(--ink);}
.step h3{font-size:21px;margin-bottom:8px;}
.step p{color:var(--ink-2);font-size:15.5px;margin-bottom:12px;}
.step-list{display:grid;gap:8px;}
.step-list li{
  position:relative;
  padding-left:20px;
  font-size:15px;
  color:var(--muted);
}
.step-list li::before{
  content:"";
  position:absolute;
  left:0;
  top:11px;
  width:8px;
  height:8px;
  border:1px solid var(--brand);
  border-radius:2px;
}

/* ---------- sticky download card ---------- */
.aside-sticky{position:sticky;top:calc(var(--header-h) + 20px);}
.dl-card{
  border:1px solid var(--line);
  border-radius:var(--r-md);
  background:var(--paper);
  padding:24px;
  box-shadow:var(--shadow);
}
.dl-card-top{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:16px;}
.dl-card h3{font-size:19px;}
.dl-card .ver{
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:22px;
  font-weight:700;
  color:var(--brand);
  letter-spacing:.02em;
  margin:4px 0 16px;
}
.dl-spec{
  display:grid;
  gap:0;
  border-top:1px solid var(--line);
  margin-bottom:20px;
}
.dl-spec div{
  display:flex;
  justify-content:space-between;
  gap:16px;
  padding:11px 0;
  border-bottom:1px solid var(--line);
  font-size:14px;
}
.dl-spec dt{color:var(--muted);}
.dl-spec dd{margin:0;font-weight:600;color:var(--ink-2);text-align:right;}
.dl-actions{display:grid;gap:10px;}
.dl-note{
  margin-top:16px;
  font-size:12.5px;
  color:var(--muted);
  line-height:1.7;
  border-top:1px dashed var(--line);
  padding-top:14px;
}
.qr-box{
  margin-top:18px;
  display:flex;
  align-items:center;
  gap:14px;
  padding:14px;
  border:1px dashed var(--line);
  border-radius:var(--r-md);
  background:var(--paper-2);
}
.qr-box .qr{
  width:64px;
  height:64px;
  flex-shrink:0;
  border:1px solid var(--line);
  border-radius:var(--r-sm);
  background:
    repeating-linear-gradient(90deg,var(--ink) 0 4px,transparent 4px 8px),
    repeating-linear-gradient(0deg,var(--ink) 0 4px,transparent 4px 8px);
  background-blend-mode:multiply;
  opacity:.75;
}
.qr-box span{font-size:13px;color:var(--ink-2);line-height:1.6;}

/* ---------- scenario cards ---------- */
.card-grid{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:20px;
}
.info-card{
  border:1px solid var(--line);
  border-radius:var(--r-md);
  background:var(--paper);
  padding:22px;
  transition:transform .22s var(--ease),border-color .22s var(--ease),background .22s var(--ease);
}
.info-card:hover{transform:translateY(-2px);border-color:var(--brand);background:var(--paper-2);}
.info-card .icon{
  display:grid;
  place-items:center;
  width:40px;
  height:40px;
  border:1px solid var(--line);
  border-radius:var(--r-md);
  color:var(--brand);
  margin-bottom:14px;
}
.info-card h3{font-size:18px;margin-bottom:8px;}
.info-card p{font-size:14.5px;color:var(--muted);line-height:1.75;}

/* ---------- table ---------- */
.table-wrap{
  overflow-x:auto;
  border:1px solid var(--line);
  border-radius:var(--r-md);
  background:var(--paper);
  -webkit-overflow-scrolling:touch;
}
table{width:100%;border-collapse:collapse;min-width:640px;font-size:14.5px;}
thead th{
  text-align:left;
  padding:14px 18px;
  font-size:12px;
  letter-spacing:.14em;
  font-weight:700;
  color:var(--muted);
  background:var(--paper-2);
  border-bottom:1px solid var(--line);
  white-space:nowrap;
}
tbody td{
  padding:14px 18px;
  border-bottom:1px solid var(--line);
  color:var(--ink-2);
  vertical-align:top;
}
tbody tr:last-child td{border-bottom:0;}
tbody tr:hover td{background:var(--paper-2);}
tbody th{
  text-align:left;
  padding:14px 18px;
  border-bottom:1px solid var(--line);
  font-weight:700;
  color:var(--ink);
  white-space:nowrap;
  background:var(--paper);
}

/* ---------- notice bar ---------- */
.notice{
  display:flex;
  gap:16px;
  align-items:flex-start;
  padding:20px 22px;
  border:1px solid var(--line);
  border-left:3px solid var(--signal);
  border-radius:var(--r-md);
  background:var(--paper-2);
}
.notice .notice-icon{
  flex-shrink:0;
  display:grid;
  place-items:center;
  width:32px;
  height:32px;
  border-radius:999px;
  background:var(--ink);
  color:var(--signal);
}
.notice h3{font-size:16px;margin-bottom:6px;}
.notice p{font-size:14.5px;color:var(--ink-2);line-height:1.8;}

/* ---------- faq ---------- */
.faq-list{border-top:1px solid var(--line);}
.faq-item{border-bottom:1px solid var(--line);}
.faq-q{
  width:100%;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  padding:22px 0;
  background:transparent;
  border:0;
  text-align:left;
  font-size:18px;
  font-weight:700;
  color:var(--ink);
  transition:color .2s var(--ease);
}
.faq-q:hover{color:var(--brand);}
.faq-icon{
  flex-shrink:0;
  display:grid;
  place-items:center;
  width:30px;
  height:30px;
  border:1px solid var(--line);
  border-radius:999px;
  position:relative;
  transition:transform .22s var(--ease),border-color .22s var(--ease),background .22s var(--ease);
}
.faq-icon::before,
.faq-icon::after{
  content:"";
  position:absolute;
  background:currentColor;
  transition:opacity .22s var(--ease);
}
.faq-icon::before{width:12px;height:1.6px;}
.faq-icon::after{width:1.6px;height:12px;}
.faq-item.open .faq-icon{transform:rotate(45deg);background:var(--signal);border-color:var(--signal);color:var(--ink);}
.faq-a{
  display:grid;
  grid-template-rows:0fr;
  transition:grid-template-rows .24s var(--ease);
}
.faq-item.open .faq-a{grid-template-rows:1fr;}
.faq-a > div{overflow:hidden;}
.faq-a p{
  padding:0 0 24px;
  font-size:15px;
  line-height:1.85;
  color:var(--muted);
  max-width:70ch;
}

/* ---------- dark cta ---------- */
.cta-block{
  background:var(--dark);
  color:var(--dark-text);
  padding:64px 0;
  position:relative;
  overflow:hidden;
}
.cta-block::after{
  content:"";
  position:absolute;
  inset:0;
  background-image:
    linear-gradient(rgba(245,243,236,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(245,243,236,.05) 1px,transparent 1px);
  background-size:48px 48px;
  pointer-events:none;
}
.cta-inner{
  position:relative;
  z-index:1;
  display:grid;
  grid-template-columns:1.3fr .7fr;
  gap:40px;
  align-items:center;
}
.cta-block h2{
  color:var(--dark-text);
  font-size:clamp(26px,3.2vw,38px);
  line-height:1.2;
  margin-bottom:14px;
}
.cta-block p{color:rgba(245,243,236,.72);font-size:15.5px;max-width:58ch;}
.cta-actions{display:flex;flex-direction:column;gap:12px;}
.cta-actions .btn-ghost{color:var(--dark-text);border-color:rgba(245,243,236,.32);}
.cta-actions .btn-ghost:hover{background:rgba(245,243,236,.1);border-color:var(--signal);color:var(--signal);}

/* ---------- footer ---------- */
.site-footer{
  background:var(--dark);
  color:rgba(245,243,236,.72);
  border-top:1px solid rgba(245,243,236,.1);
  padding:56px 0 0;
  font-size:14px;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.6fr 1fr 1fr 1fr;
  gap:40px;
  padding-bottom:44px;
}
.footer-logo{display:flex;align-items:center;gap:10px;margin-bottom:16px;color:var(--dark-text);}
.footer-logo .logo-mark{border-color:rgba(245,243,236,.32);color:var(--signal);}
.footer-logo .logo-text strong{color:var(--dark-text);}
.footer-logo .logo-text em{color:rgba(245,243,236,.5);}
.footer-brand p{line-height:1.85;max-width:38ch;color:rgba(245,243,236,.62);}
.footer-col h4{
  color:var(--dark-text);
  font-size:13px;
  letter-spacing:.14em;
  font-weight:700;
  margin-bottom:16px;
}
.footer-col ul{display:grid;gap:10px;}
.footer-col a{color:rgba(245,243,236,.7);}
.footer-col a:hover{color:var(--signal);}
.footer-col li{line-height:1.7;}
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  justify-content:space-between;
  align-items:center;
  padding:20px 0 26px;
  border-top:1px solid rgba(245,243,236,.1);
  font-size:12.5px;
  color:rgba(245,243,236,.5);
}

/* ---------- reveal ---------- */
.js .reveal{opacity:0;transform:translateY(12px);transition:opacity .5s var(--ease),transform .5s var(--ease);}
.js .reveal.in{opacity:1;transform:none;}

/* ---------- responsive ---------- */
@media (max-width:1200px){
  .container{padding:0 20px;}
  .main-nav a{padding:8px 10px;font-size:14.5px;}
}
@media (max-width:1024px){
  .hero-grid{grid-template-columns:1fr;gap:32px;}
  .hero-figure{max-width:560px;}
  .split{grid-template-columns:1fr;gap:32px;}
  .aside-sticky{position:static;}
  .cta-inner{grid-template-columns:1fr;gap:28px;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
}
@media (max-width:992px){
  .main-nav{
    position:fixed;
    top:0;
    right:0;
    bottom:0;
    width:min(320px,86vw);
    margin-left:0;
    padding:calc(var(--header-h) + 16px) 24px 28px;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    background:var(--paper);
    border-left:1px solid var(--line);
    box-shadow:-12px 0 32px rgba(17,21,20,.14);
    transform:translateX(100%);
    transition:transform .24s var(--ease);
    z-index:75;
    overflow-y:auto;
  }
  .main-nav.is-open{transform:translateX(0);}
  .main-nav a{padding:15px 4px;border-bottom:1px solid var(--line);font-size:15.5px;border-radius:0;}
  .main-nav a::after{left:4px;right:auto;width:20px;bottom:8px;}
  .nav-toggle{display:block;}
  .header-actions{margin-left:auto;}
  .btn-text{display:none;}
}
@media (max-width:768px){
  .section{padding:56px 0;}
  .section-tight{padding:40px 0;}
  .page-hero{padding:16px 0 36px;}
  .step{grid-template-columns:48px minmax(0,1fr);gap:16px;}
  .step-num{width:48px;height:48px;font-size:17px;}
  .card-grid{grid-template-columns:1fr;}
  .section-head{align-items:flex-start;}
  .footer-grid{grid-template-columns:1fr 1fr;}
  .btn{width:auto;}
  .hero-lead{font-size:16px;}
  .btn-nav{padding:0 14px;font-size:13.5px;}
}
@media (max-width:480px){
  .container{padding:0 16px;}
  .logo-text strong{font-size:15px;}
  .logo-text em{letter-spacing:.16em;font-size:10px;}
  .header-inner{gap:12px;}
  .cta-actions .btn{width:100%;}
  .dl-card{padding:18px;}
  .footer-grid{grid-template-columns:1fr;gap:28px;}
  .footer-bottom{flex-direction:column;align-items:flex-start;}
  .faq-q{font-size:16px;padding:18px 0;}
  .pills{gap:8px;}
  .pill{height:34px;font-size:13px;padding:0 13px;}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none !important;animation:none !important;}
  html{scroll-behavior:auto;}
  .js .reveal{opacity:1;transform:none;}
}

/* roulang page: article */
:root{
  --ink:#111514;
  --ink-2:#2A312F;
  --paper:#F5F3EC;
  --paper-2:#EBE7DC;
  --paper-3:#FBF9F4;
  --line:#D8D3C7;
  --muted:#6E746F;
  --brand:#1F5C55;
  --brand-2:#2F7A70;
  --signal:#D9F24F;
  --danger:#B3402E;
  --success:#2F6F4E;
  --dark:#0E1211;
  --radius:8px;
  --radius-sm:4px;
  --shadow-float:0 12px 32px rgba(17,21,20,.08);
  --ease:cubic-bezier(.2,.7,.2,1);
  --container:1200px;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
  font-size:16px;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img{max-width:100%;display:block;border:0}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,p,figure{margin:0}
input,textarea,select{font:inherit;color:inherit}
::selection{background:var(--signal);color:var(--ink)}
:focus-visible{outline:2px solid var(--signal);outline-offset:2px}

.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 32px}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(245,243,236,.94);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.header-inner{display:flex;align-items:center;gap:28px;height:76px}
.logo{display:flex;align-items:center;gap:10px;flex-shrink:0}
.logo-mark{
  display:grid;place-items:center;width:38px;height:38px;border-radius:10px;
  background:var(--ink);color:var(--signal);transition:background .2s var(--ease);
}
.logo:hover .logo-mark{background:var(--brand)}
.logo-text{display:flex;flex-direction:column;line-height:1.15}
.logo-text strong{font-size:16px;font-weight:800;letter-spacing:-.01em}
.logo-text em{font-style:normal;font-size:11px;letter-spacing:.18em;color:var(--muted)}

.main-nav{display:flex;align-items:center;gap:4px;margin-left:auto}
.main-nav a{
  position:relative;padding:9px 12px;border-radius:var(--radius-sm);
  font-size:15px;color:var(--ink-2);
  transition:color .2s var(--ease),background .2s var(--ease);
}
.main-nav a:hover{color:var(--brand);background:var(--paper-2)}
.main-nav a.active{color:var(--ink);font-weight:700}
.main-nav a.active::after{
  content:"";position:absolute;left:12px;right:12px;bottom:2px;height:2px;
  background:var(--brand);border-radius:2px;
}

.header-actions{display:flex;align-items:center;gap:12px;flex-shrink:0}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:46px;padding:0 22px;border-radius:var(--radius-sm);
  border:1px solid transparent;font-size:15px;font-weight:600;line-height:1;letter-spacing:.01em;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .15s var(--ease);
}
.btn .arrow{transition:transform .2s var(--ease)}
.btn:hover .arrow{transform:translateX(3px)}
.btn:active{transform:translateY(1px)}
.btn:disabled{opacity:.45;cursor:not-allowed;transform:none}
.btn-primary{background:var(--ink);color:var(--signal)}
.btn-primary:hover{background:var(--brand);color:#FFFFFF}
.btn-ghost{border-color:var(--line);background:transparent;color:var(--ink)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand);background:var(--paper-2)}
.btn-sm{height:44px;padding:0 18px;font-size:14px}
.btn-block{width:100%}
.btn-text{
  position:relative;font-size:15px;color:var(--ink-2);padding:8px 4px;
}
.btn-text::after{
  content:"";position:absolute;left:4px;right:4px;bottom:4px;height:1px;background:currentColor;
  transform:scaleX(0);transform-origin:left;transition:transform .2s var(--ease);
}
.btn-text:hover{color:var(--brand)}
.btn-text:hover::after{transform:scaleX(1)}

.nav-toggle{
  display:none;position:relative;width:44px;height:44px;border:1px solid var(--line);
  border-radius:6px;background:transparent;
}
.nav-toggle span{
  position:absolute;top:50%;left:50%;width:18px;height:2px;background:var(--ink);
  transform:translate(-50%,-50%);transition:background .2s var(--ease);
}
.nav-toggle span::before,.nav-toggle span::after{
  content:"";position:absolute;left:0;width:18px;height:2px;background:var(--ink);
  transition:transform .2s var(--ease),top .2s var(--ease);
}
.nav-toggle span::before{top:-6px}
.nav-toggle span::after{top:6px}
.nav-toggle[aria-expanded="true"] span{background:transparent}
.nav-toggle[aria-expanded="true"] span::before{top:0;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] span::after{top:0;transform:rotate(-45deg)}

/* ---------- breadcrumb ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding:30px 0 0;font-size:13px;color:var(--muted);
}
.breadcrumb a{transition:color .2s var(--ease)}
.breadcrumb a:hover{color:var(--brand)}
.breadcrumb .sep{opacity:.45}
.breadcrumb .current{color:var(--ink-2);max-width:420px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

/* ---------- article head ---------- */
.article-hero{padding:20px 0 0}
.article-meta{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin-bottom:20px}
.tag{
  display:inline-flex;align-items:center;height:26px;padding:0 11px;
  border:1px solid var(--line);border-radius:999px;background:var(--paper-2);
  font-size:12px;letter-spacing:.04em;color:var(--ink-2);
}
.tag-signal{background:var(--signal);border-color:var(--signal);color:var(--ink);font-weight:700}
.meta-time{font-size:13px;color:var(--muted);letter-spacing:.02em}
.meta-dot{width:4px;height:4px;border-radius:50%;background:var(--line)}

.article-title{
  font-size:clamp(30px,4.2vw,52px);line-height:1.16;letter-spacing:-.02em;
  font-weight:800;max-width:920px;
}
.article-lead{
  max-width:780px;margin-top:20px;font-size:16px;line-height:1.85;color:var(--ink-2);
}

.article-cover{
  margin:36px 0 0;border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;background:var(--paper-2);aspect-ratio:16/9;
}
.article-cover img{width:100%;height:100%;object-fit:cover}

/* ---------- article layout ---------- */
.article-layout{
  display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:56px;
  align-items:start;padding:56px 0 0;
}
.article-main{min-width:0}

.article-body{max-width:800px;font-size:17px;line-height:1.95;color:var(--ink-2)}
.article-body > *:first-child{margin-top:0}
.article-body h2{
  position:relative;font-size:26px;line-height:1.35;font-weight:800;color:var(--ink);
  margin:48px 0 18px;padding-left:16px;border-left:4px solid var(--brand);
  letter-spacing:-.01em;scroll-margin-top:100px;
}
.article-body h3{
  font-size:20px;line-height:1.5;font-weight:700;color:var(--ink);
  margin:34px 0 12px;scroll-margin-top:100px;
}
.article-body h4{font-size:17px;font-weight:700;color:var(--ink);margin:26px 0 10px}
.article-body p{margin:0 0 20px}
.article-body ul,.article-body ol{margin:0 0 22px;padding-left:24px}
.article-body ul{list-style:disc}
.article-body ol{list-style:decimal}
.article-body li{margin-bottom:10px;padding-left:2px}
.article-body li::marker{color:var(--brand)}
.article-body strong{color:var(--ink);font-weight:700}
.article-body a{color:var(--brand);border-bottom:1px solid rgba(31,92,85,.35);transition:border-color .2s var(--ease)}
.article-body a:hover{border-bottom-color:var(--brand)}
.article-body blockquote{
  margin:28px 0;padding:20px 24px;background:var(--paper-2);
  border-left:3px solid var(--brand);border-radius:0 6px 6px 0;color:var(--ink);font-size:16px;
}
.article-body blockquote p:last-child{margin-bottom:0}
.article-body img{border-radius:var(--radius-sm);margin:26px 0;width:100%;height:auto}
.article-body table{
  width:100%;border-collapse:collapse;margin:26px 0;font-size:15px;line-height:1.7;
  background:var(--paper-3);
}
.article-body th,.article-body td{border:1px solid var(--line);padding:12px 14px;text-align:left}
.article-body th{background:var(--paper-2);font-size:13px;font-weight:700;letter-spacing:.04em;color:var(--ink-2)}
.article-body tr:hover td{background:var(--paper-2)}
.article-body hr{border:0;border-top:1px solid var(--line);margin:36px 0}
.article-body code{
  background:var(--paper-2);color:var(--ink);padding:2px 6px;border-radius:3px;font-size:.92em;
}
.article-body pre{
  background:var(--dark);color:var(--paper);padding:20px;border-radius:var(--radius);
  overflow-x:auto;margin:24px 0;font-size:14px;line-height:1.7;
}
.article-body pre code{background:none;color:inherit;padding:0}

/* ---------- empty state ---------- */
.empty-state{
  border:1px dashed var(--line);border-radius:var(--radius);background:var(--paper-3);
  padding:56px 28px;text-align:center;max-width:800px;
}
.empty-state h2{font-size:22px;font-weight:800;color:var(--ink);margin-bottom:12px}
.empty-state p{color:var(--muted);font-size:15px;line-height:1.85;margin-bottom:24px}
.empty-icon{
  width:56px;height:56px;margin:0 auto 20px;border-radius:50%;
  display:grid;place-items:center;border:1px solid var(--line);color:var(--brand);background:var(--paper-2);
}

/* ---------- sidebar ---------- */
.sidebar{position:sticky;top:100px;display:flex;flex-direction:column;gap:18px}
.side-card{
  border:1px solid var(--line);border-radius:var(--radius);background:var(--paper-3);padding:20px;
}
.side-card h3{
  font-size:12px;font-weight:700;letter-spacing:.16em;color:var(--muted);
  margin-bottom:14px;text-transform:uppercase;
}
.toc{display:flex;flex-direction:column;gap:9px;border-left:1px solid var(--line);padding-left:14px}
.toc a{
  font-size:14px;line-height:1.6;color:var(--ink-2);
  transition:color .2s var(--ease),transform .2s var(--ease);display:block;
}
.toc a:hover{color:var(--brand);transform:translateX(2px)}
.side-related{display:flex;flex-direction:column;gap:14px}
.side-related a{display:flex;gap:12px;align-items:flex-start}
.side-related .thumb{
  width:66px;height:50px;flex-shrink:0;border-radius:var(--radius-sm);overflow:hidden;background:var(--paper-2);
}
.side-related .thumb img{width:100%;height:100%;object-fit:cover;transition:transform .3s var(--ease)}
.side-related a:hover .thumb img{transform:scale(1.05)}
.side-related .txt{font-size:14px;line-height:1.55;color:var(--ink-2);transition:color .2s var(--ease)}
.side-related a:hover .txt{color:var(--brand)}

.side-cta{background:var(--dark);border-color:var(--dark);color:var(--paper)}
.side-cta h3{color:rgba(245,243,236,.55)}
.side-cta p{font-size:14px;line-height:1.75;color:rgba(245,243,236,.76);margin-bottom:18px}
.side-cta .btn{width:100%;background:var(--signal);color:var(--ink)}
.side-cta .btn:hover{background:var(--paper);color:var(--ink)}

/* ---------- article foot ---------- */
.article-tags{
  display:flex;flex-wrap:wrap;gap:10px;margin:44px 0 0;padding-top:26px;border-top:1px solid var(--line);
  max-width:800px;
}
.article-back{
  display:inline-flex;align-items:center;gap:8px;margin-top:26px;
  font-size:14px;color:var(--brand);font-weight:600;
}
.article-back .arrow{transition:transform .2s var(--ease)}
.article-back:hover .arrow{transform:translateX(-3px)}

/* ---------- related ---------- */
.related{padding:80px 0 0}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:28px}
.section-head h2{font-size:clamp(24px,3vw,34px);line-height:1.2;font-weight:800;letter-spacing:-.02em}
.section-head .link-more{
  display:inline-flex;align-items:center;gap:6px;font-size:14px;color:var(--brand);font-weight:600;
}
.section-head .link-more .arrow{transition:transform .2s var(--ease)}
.section-head .link-more:hover .arrow{transform:translateX(3px)}

.related-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.related-card{
  display:flex;flex-direction:column;border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;background:var(--paper-3);
  transition:transform .2s var(--ease),border-color .2s var(--ease);
}
.related-card:hover{transform:translateY(-2px);border-color:var(--brand)}
.related-card .cover{aspect-ratio:16/9;overflow:hidden;background:var(--paper-2)}
.related-card .cover img{width:100%;height:100%;object-fit:cover;transition:transform .3s var(--ease)}
.related-card:hover .cover img{transform:scale(1.02)}
.related-card .body{padding:18px 18px 20px;display:flex;flex-direction:column;gap:10px;flex:1}
.related-card .body .tag{align-self:flex-start}
.related-card h3{font-size:17px;line-height:1.5;font-weight:700;color:var(--ink)}
.related-card p{font-size:14px;line-height:1.7;color:var(--muted);flex:1}
.related-card .go{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:600;color:var(--brand)}
.related-card .go .arrow{transition:transform .2s var(--ease)}
.related-card:hover .go .arrow{transform:translateX(3px)}

/* ---------- cta band ---------- */
.cta-band{
  margin-top:80px;background:var(--dark);color:var(--paper);border-radius:12px;
  padding:48px;display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap;
  position:relative;overflow:hidden;
}
.cta-band::before{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(245,243,236,.055) 1px,transparent 1px),linear-gradient(90deg,rgba(245,243,236,.055) 1px,transparent 1px);
  background-size:44px 44px;pointer-events:none;
}
.cta-band > *{position:relative;z-index:1}
.cta-band h2{font-size:clamp(24px,3vw,34px);line-height:1.25;font-weight:800;letter-spacing:-.02em;max-width:560px}
.cta-band p{margin-top:12px;font-size:15px;line-height:1.8;color:rgba(245,243,236,.72);max-width:560px}
.cta-actions{display:flex;gap:14px;flex-wrap:wrap}
.cta-band .btn-primary{background:var(--signal);color:var(--ink)}
.cta-band .btn-primary:hover{background:var(--paper);color:var(--ink)}
.cta-band .btn-ghost{border-color:rgba(245,243,236,.35);color:var(--paper)}
.cta-band .btn-ghost:hover{background:rgba(245,243,236,.1);border-color:var(--paper);color:var(--paper)}

/* ---------- footer ---------- */
.site-footer{
  background:var(--dark);color:var(--paper);margin-top:96px;
  border-top:1px solid rgba(245,243,236,.1);
}
.footer-grid{
  display:grid;grid-template-columns:1.7fr 1fr 1fr 1fr;gap:40px;
  padding:64px 0 40px;
}
.footer-logo{display:flex;align-items:center;gap:10px}
.footer-logo .logo-mark{background:rgba(245,243,236,.08);color:var(--signal)}
.footer-logo .logo-text strong{color:var(--paper)}
.footer-logo .logo-text em{color:rgba(245,243,236,.55)}
.footer-brand p{
  margin-top:18px;max-width:340px;font-size:14px;line-height:1.85;color:rgba(245,243,236,.66);
}
.footer-col h4{
  font-size:12px;font-weight:700;letter-spacing:.16em;color:rgba(245,243,236,.5);
  margin-bottom:16px;text-transform:uppercase;
}
.footer-col ul{display:flex;flex-direction:column;gap:11px}
.footer-col li,.footer-col a{font-size:14px;line-height:1.6;color:rgba(245,243,236,.72)}
.footer-col a{transition:color .2s var(--ease)}
.footer-col a:hover{color:var(--signal)}
.footer-bottom{
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  border-top:1px solid rgba(245,243,236,.12);padding:20px 0 28px;
  font-size:13px;color:rgba(245,243,236,.5);
}

/* ---------- motion ---------- */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .55s var(--ease),transform .55s var(--ease)}
.reveal.is-visible{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:1200px){
  .container{padding:0 24px}
  .article-layout{grid-template-columns:minmax(0,1fr) 288px;gap:40px}
}
@media (max-width:992px){
  .article-layout{grid-template-columns:1fr;gap:36px;padding-top:44px}
  .article-body{max-width:none}
  .sidebar{position:static;top:auto;flex-direction:row;flex-wrap:wrap}
  .side-card{flex:1 1 260px}
  .related-grid{grid-template-columns:1fr 1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .cta-band{padding:36px}
}
@media (max-width:900px){
  .main-nav{
    position:fixed;top:76px;left:0;right:0;bottom:0;
    flex-direction:column;align-items:stretch;gap:0;margin-left:0;
    padding:16px 24px 96px;overflow-y:auto;
    background:var(--paper);border-top:1px solid var(--line);
    transform:translateX(100%);transition:transform .26s var(--ease);z-index:70;
  }
  .main-nav.is-open{transform:translateX(0)}
  .main-nav a{
    padding:16px 4px;font-size:17px;border-radius:0;border-bottom:1px solid var(--line);
  }
  .main-nav a.active::after{display:none}
  .main-nav a.active{color:var(--brand)}
  .nav-toggle{display:block}
  .header-actions .btn-text{display:none}
}
@media (max-width:768px){
  .container{padding:0 20px}
  .header-inner{height:68px;gap:14px}
  .main-nav{top:68px}
  .logo-text em{display:none}
  .article-title{font-size:clamp(26px,6.4vw,36px)}
  .article-cover{margin-top:28px}
  .related{padding-top:56px}
  .related-grid{grid-template-columns:1fr}
  .article-body{font-size:16px;line-height:1.9}
  .article-body h2{font-size:22px;margin-top:38px}
  .article-body h3{font-size:18px}
  .cta-band{padding:30px 24px;border-radius:10px;margin-top:56px}
  .footer-grid{padding:48px 0 32px}
  .sidebar{flex-direction:column}
  .side-card{flex:1 1 auto}
}
@media (max-width:520px){
  .container{padding:0 16px}
  .header-actions .btn-nav{display:none}
  .breadcrumb{padding-top:20px}
  .article-meta{gap:10px}
  .article-lead{font-size:15px}
  .related-grid{gap:16px}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer-bottom{flex-direction:column;gap:8px;font-size:12px}
  .cta-actions{width:100%}
  .cta-actions .btn{width:100%}
  .empty-state{padding:40px 20px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms !important;transition-duration:.001ms !important}
  .reveal{opacity:1;transform:none}
}

/* roulang page: category3 */
:root{
  --ink:#111514;
  --ink-2:#2A312F;
  --paper:#F5F3EC;
  --paper-2:#EBE7DC;
  --line:#D8D3C7;
  --muted:#6E746F;
  --brand:#1F5C55;
  --brand-2:#2F7A70;
  --signal:#D9F24F;
  --danger:#B3402E;
  --success:#2F6F4E;
  --dark:#0E1211;
  --radius-s:2px;
  --radius-m:6px;
  --radius-l:8px;
  --radius-xl:12px;
  --shadow-float:0 12px 32px rgba(17,21,20,.08);
  --ease:cubic-bezier(.2,.7,.2,1);
  --dur:200ms;
  --font:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font);
  font-size:16px;
  line-height:1.8;
  color:var(--ink);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
button{font-family:inherit;font-size:inherit;cursor:pointer;border:0;background:none;color:inherit}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,p{margin:0}
svg{display:block}
:focus-visible{outline:2px solid var(--signal);outline-offset:2px}
::selection{background:var(--signal);color:var(--ink)}
.container{
  width:100%;
  max-width:1200px;
  margin:0 auto;
  padding:0 32px;
}

/* ---------- header ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:100;
  background:rgba(245,243,236,.88);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.header-inner{
  display:flex;
  align-items:center;
  gap:24px;
  min-height:76px;
}
.logo{
  display:inline-flex;
  align-items:center;
  gap:10px;
  flex-shrink:0;
  color:var(--ink);
}
.logo-mark{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:40px;
  height:40px;
  border:1px solid var(--line);
  border-radius:var(--radius-m);
  background:var(--paper-2);
  color:var(--brand);
  transition:background var(--dur) var(--ease),border-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.logo:hover .logo-mark{background:var(--ink);border-color:var(--ink);color:var(--signal)}
.logo-text{display:flex;flex-direction:column;line-height:1.15}
.logo-text strong{font-size:17px;font-weight:800;letter-spacing:-.01em}
.logo-text em{font-style:normal;font-size:11px;letter-spacing:.18em;color:var(--muted);text-transform:uppercase}
.main-nav{
  display:flex;
  align-items:center;
  gap:4px;
  margin-left:auto;
  flex-wrap:wrap;
}
.main-nav a{
  position:relative;
  padding:10px 12px;
  font-size:14.5px;
  font-weight:600;
  color:var(--ink-2);
  border-radius:var(--radius-m);
  transition:color var(--dur) var(--ease),background var(--dur) var(--ease);
  white-space:nowrap;
}
.main-nav a::after{
  content:"";
  position:absolute;
  left:12px;
  right:12px;
  bottom:4px;
  height:2px;
  background:var(--signal);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform var(--dur) var(--ease);
}
.main-nav a:hover{color:var(--brand);background:var(--paper-2)}
.main-nav a:hover::after,
.main-nav a.active::after{transform:scaleX(1)}
.main-nav a.active{color:var(--ink);font-weight:800}
.nav-cta-mobile{display:none}
.header-actions{
  display:flex;
  align-items:center;
  gap:12px;
  flex-shrink:0;
}
.btn-text{
  font-size:14px;
  font-weight:600;
  color:var(--ink-2);
  border-bottom:1px solid transparent;
  padding-bottom:2px;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.btn-text:hover{color:var(--brand);border-color:var(--brand)}
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:13px 22px;
  font-size:15px;
  font-weight:700;
  line-height:1.2;
  border-radius:var(--radius-m);
  border:1px solid transparent;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.btn .arrow{transition:transform var(--dur) var(--ease)}
.btn:hover .arrow{transform:translateX(3px)}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--ink);color:var(--signal);border-color:var(--ink)}
.btn-primary:hover{background:var(--signal);color:var(--ink);border-color:var(--signal)}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand);background:rgba(31,92,85,.06)}
.btn-sm{padding:10px 18px;font-size:14px}
.btn-nav{min-height:44px}
.btn-signal{background:var(--signal);color:var(--ink);border-color:var(--signal)}
.btn-signal:hover{background:transparent;color:var(--signal);border-color:var(--signal)}
.nav-toggle{
  display:none;
  width:44px;
  height:44px;
  border:1px solid var(--line);
  border-radius:var(--radius-m);
  position:relative;
  background:var(--paper);
}
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after{
  position:absolute;
  left:50%;
  width:18px;
  height:2px;
  background:var(--ink);
  transform:translateX(-50%);
  transition:transform var(--dur) var(--ease),opacity var(--dur) var(--ease);
}
.nav-toggle span{top:50%;margin-top:-1px}
.nav-toggle span::before{content:"";top:-6px;left:0;transform:none}
.nav-toggle span::after{content:"";top:6px;left:0;transform:none}
.nav-toggle[aria-expanded="true"] span{background:transparent}
.nav-toggle[aria-expanded="true"] span::before{transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span::after{transform:translateY(-6px) rotate(-45deg)}

/* ---------- breadcrumb ---------- */
.breadcrumb{
  padding:22px 0 0;
  font-size:13px;
  color:var(--muted);
  display:flex;
  align-items:center;
  gap:8px;
  flex-wrap:wrap;
}
.breadcrumb a{color:var(--muted);transition:color var(--dur) var(--ease)}
.breadcrumb a:hover{color:var(--brand)}
.breadcrumb .sep{color:var(--line)}
.breadcrumb .current{color:var(--ink-2);font-weight:600}

/* ---------- hero ---------- */
.page-hero{padding:36px 0 72px}
.hero-grid{
  display:grid;
  grid-template-columns:1.15fr .85fr;
  gap:56px;
  align-items:center;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:6px 14px;
  font-size:12px;
  font-weight:700;
  letter-spacing:.14em;
  color:var(--brand);
  background:rgba(31,92,85,.08);
  border:1px solid rgba(31,92,85,.22);
  border-radius:999px;
  margin-bottom:24px;
}
.eyebrow .dot{width:6px;height:6px;border-radius:50%;background:var(--brand)}
h1{
  font-size:clamp(34px,5vw,60px);
  line-height:1.08;
  letter-spacing:-.02em;
  font-weight:800;
  color:var(--ink);
}
.hero-sub{
  margin-top:22px;
  font-size:17px;
  line-height:1.85;
  color:var(--ink-2);
  max-width:36em;
}
.hero-actions{
  display:flex;
  flex-wrap:wrap;
  gap:14px;
  margin-top:32px;
}
.anchor-chips{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-top:34px;
  padding-top:26px;
  border-top:1px solid var(--line);
}
.anchor-chips a{
  padding:7px 16px;
  font-size:13px;
  font-weight:600;
  color:var(--ink-2);
  border:1px solid var(--line);
  border-radius:999px;
  background:var(--paper);
  transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.anchor-chips a:hover{border-color:var(--brand);color:var(--brand);background:rgba(31,92,85,.06)}
.hero-figure{
  position:relative;
  border-radius:var(--radius-l);
  overflow:hidden;
  border:1px solid var(--line);
  background:var(--paper-2);
  aspect-ratio:4/3;
}
.hero-figure img{width:100%;height:100%;object-fit:cover}
.hero-badge{
  position:absolute;
  left:16px;
  bottom:16px;
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:8px 14px;
  font-size:12px;
  font-weight:700;
  color:var(--ink);
  background:var(--signal);
  border-radius:var(--radius-m);
}
.hero-badge .mono{font-family:var(--mono);font-size:11px;letter-spacing:.04em}

/* ---------- section basics ---------- */
.section{padding:80px 0}
.section--tight{padding:64px 0}
.section-head{max-width:760px;margin-bottom:44px}
.section-head h2{
  font-size:clamp(26px,3.4vw,40px);
  line-height:1.16;
  letter-spacing:-.02em;
  font-weight:800;
}
.section-head p{margin-top:16px;color:var(--ink-2);font-size:16px}
.kicker{
  display:block;
  font-size:12px;
  font-weight:700;
  letter-spacing:.2em;
  color:var(--brand);
  margin-bottom:14px;
}

/* ---------- precheck ---------- */
.precheck{
  background:var(--paper-2);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.precheck-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:0;
  border-left:1px solid var(--line);
}
.check-item{
  padding:28px 24px;
  border-right:1px solid var(--line);
  transition:background var(--dur) var(--ease);
}
.check-item:hover{background:rgba(245,243,236,.7)}
.check-item .num{
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.12em;
  color:var(--brand);
  font-weight:700;
}
.check-item h3{
  font-size:17px;
  font-weight:800;
  margin:10px 0 8px;
  line-height:1.4;
}
.check-item p{font-size:14px;color:var(--muted);line-height:1.75}

/* ---------- steps ---------- */
.steps-wrap{display:grid;gap:72px}
.step{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:56px;
  align-items:center;
}
.step--flip .step-media{order:2}
.step-media{
  position:relative;
  border-radius:var(--radius-l);
  overflow:hidden;
  border:1px solid var(--line);
  background:var(--paper-2);
  aspect-ratio:16/10;
}
.step-media img{width:100%;height:100%;object-fit:cover;transition:transform 420ms var(--ease)}
.step-media:hover img{transform:scale(1.02)}
.step-num{
  font-family:var(--mono);
  font-size:clamp(48px,7vw,92px);
  font-weight:800;
  line-height:1;
  letter-spacing:-.04em;
  color:rgba(31,92,85,.16);
  -webkit-text-stroke:1px rgba(31,92,85,.32);
  margin-bottom:14px;
}
.step-body h3{
  font-size:clamp(21px,2.4vw,26px);
  font-weight:800;
  line-height:1.3;
  letter-spacing:-.01em;
}
.step-body p{margin-top:16px;color:var(--ink-2);font-size:16px;line-height:1.85}
.tick-list{margin-top:22px;display:grid;gap:12px}
.tick-list li{
  position:relative;
  padding-left:30px;
  font-size:15px;
  color:var(--ink-2);
  line-height:1.75;
}
.tick-list li::before{
  content:"";
  position:absolute;
  left:0;
  top:8px;
  width:16px;
  height:16px;
  border-radius:3px;
  background:var(--signal);
  box-shadow:inset 0 0 0 1px rgba(17,21,20,.18);
}
.tick-list li::after{
  content:"";
  position:absolute;
  left:5px;
  top:12px;
  width:6px;
  height:3px;
  border-left:1.6px solid var(--ink);
  border-bottom:1.6px solid var(--ink);
  transform:rotate(-45deg);
}
.step-note{
  margin-top:24px;
  padding:14px 18px;
  border-left:2px solid var(--brand);
  background:rgba(31,92,85,.06);
  font-size:14px;
  color:var(--ink-2);
  border-radius:0 var(--radius-m) var(--radius-m) 0;
}

/* ---------- faq ---------- */
.faq-section{background:var(--paper-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.faq-list{
  max-width:900px;
  border-top:1px solid var(--line);
}
.acc-item{border-bottom:1px solid var(--line)}
.acc-item summary{
  list-style:none;
  cursor:pointer;
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:20px;
  padding:24px 4px;
  font-size:18px;
  font-weight:700;
  line-height:1.55;
  color:var(--ink);
  transition:color var(--dur) var(--ease);
}
.acc-item summary::-webkit-details-marker{display:none}
.acc-item summary::after{
  content:"+";
  flex-shrink:0;
  width:26px;
  height:26px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  font-size:20px;
  font-weight:400;
  line-height:1;
  color:var(--brand);
  border:1px solid var(--line);
  border-radius:50%;
  background:var(--paper);
  transition:transform var(--dur) var(--ease),background var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.acc-item summary:hover{color:var(--brand)}
.acc-item summary:hover::after{border-color:var(--brand)}
.acc-item[open] summary::after{transform:rotate(45deg);background:var(--ink);color:var(--signal);border-color:var(--ink)}
.acc-body{padding:0 4px 26px;max-width:70ch}
.acc-body p{font-size:15px;line-height:1.85;color:var(--ink-2)}

/* ---------- cta ---------- */
.cta-band{
  position:relative;
  background:var(--dark);
  color:var(--paper);
  padding:76px 0;
  overflow:hidden;
}
.cta-band::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:linear-gradient(180deg,rgba(14,18,17,.88),rgba(14,18,17,.94)),url("/assets/images/backpic/back-1.png");
  background-size:cover;
  background-position:center;
  opacity:.85;
}
.cta-band::after{
  content:"";
  position:absolute;
  inset:0;
  background-image:linear-gradient(rgba(245,243,236,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(245,243,236,.05) 1px,transparent 1px);
  background-size:56px 56px;
  pointer-events:none;
}
.cta-inner{
  position:relative;
  z-index:1;
  display:grid;
  grid-template-columns:1.2fr .8fr;
  gap:48px;
  align-items:center;
}
.cta-inner h2{
  font-size:clamp(26px,3.4vw,40px);
  line-height:1.18;
  letter-spacing:-.02em;
  font-weight:800;
  color:var(--paper);
}
.cta-inner p{margin-top:16px;color:rgba(245,243,236,.72);font-size:16px;max-width:34em}
.cta-actions{display:flex;flex-wrap:wrap;gap:14px;justify-content:flex-end}
.cta-band .btn-ghost{color:var(--paper);border-color:rgba(245,243,236,.35)}
.cta-band .btn-ghost:hover{border-color:var(--signal);color:var(--signal);background:rgba(217,242,79,.08)}

/* ---------- footer ---------- */
.site-footer{
  background:var(--dark);
  color:var(--paper);
  border-top:1px solid rgba(245,243,236,.12);
  padding:64px 0 28px;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.6fr 1fr 1fr 1fr;
  gap:40px;
}
.footer-logo{display:inline-flex;align-items:center;gap:10px;margin-bottom:18px}
.footer-logo .logo-mark{background:rgba(245,243,236,.08);border-color:rgba(245,243,236,.2);color:var(--signal)}
.footer-logo .logo-text strong{color:var(--paper);font-size:17px;font-weight:800}
.footer-logo .logo-text em{color:rgba(245,243,236,.55)}
.footer-brand p{font-size:14px;line-height:1.85;color:rgba(245,243,236,.66);max-width:34em}
.footer-col h4{
  font-size:13px;
  font-weight:700;
  letter-spacing:.14em;
  color:rgba(245,243,236,.5);
  margin-bottom:18px;
}
.footer-col ul{display:grid;gap:11px}
.footer-col li{font-size:14px;color:rgba(245,243,236,.72);line-height:1.6}
.footer-col a{
  color:rgba(245,243,236,.78);
  border-bottom:1px solid transparent;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.footer-col a:hover{color:var(--signal);border-color:var(--signal)}
.footer-bottom{
  margin-top:48px;
  padding-top:22px;
  border-top:1px solid rgba(245,243,236,.12);
  display:flex;
  justify-content:space-between;
  gap:16px;
  flex-wrap:wrap;
  font-size:13px;
  color:rgba(245,243,236,.5);
}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(12px);transition:opacity 420ms var(--ease),transform 420ms var(--ease)}
.reveal.is-in{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:1200px){
  .container{padding:0 28px}
  .main-nav a{padding:10px 9px;font-size:14px}
  .hero-grid{gap:40px}
}
@media (max-width:992px){
  .main-nav{display:none}
  .nav-toggle{display:inline-flex;align-items:center;justify-content:center}
  .main-nav{
    position:fixed;
    top:76px;
    right:0;
    left:0;
    bottom:0;
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding:20px 24px 32px;
    background:var(--paper);
    border-top:1px solid var(--line);
    overflow-y:auto;
    z-index:99;
  }
  .main-nav.is-open{display:flex}
  .main-nav a{
    padding:16px 4px;
    font-size:16px;
    border-bottom:1px solid var(--line);
    border-radius:0;
    display:flex;
    align-items:center;
    justify-content:space-between;
  }
  .main-nav a::after{display:none}
  .main-nav a::before{
    content:"";
    width:5px;height:5px;border-radius:50%;
    background:var(--line);
    margin-right:12px;
    flex-shrink:0;
    order:-1;
  }
  .main-nav a.active::before{background:var(--signal)}
  .main-nav a:hover{background:transparent;color:var(--brand)}
  .nav-cta-mobile{
    display:flex;
    margin-top:24px;
    justify-content:center;
    padding:15px 22px;
    background:var(--ink);
    color:var(--signal);
    border:1px solid var(--ink);
    border-radius:var(--radius-m);
    font-weight:700;
    font-size:15px;
  }
  .nav-cta-mobile::before{display:none}
  .nav-cta-mobile:hover{background:var(--signal);color:var(--ink);border-color:var(--signal)}
  .btn-text{display:none}
  .hero-grid{grid-template-columns:1fr;gap:36px}
  .hero-figure{aspect-ratio:16/9}
  .precheck-grid{grid-template-columns:repeat(2,1fr);border-top:1px solid var(--line)}
  .check-item{border-bottom:1px solid var(--line)}
  .step{grid-template-columns:1fr;gap:28px}
  .step--flip .step-media{order:0}
  .step-media{aspect-ratio:16/9}
  .cta-inner{grid-template-columns:1fr;gap:28px}
  .cta-actions{justify-content:flex-start}
  .footer-grid{grid-template-columns:1fr 1fr;gap:36px}
  .footer-brand{grid-column:1 / -1}
  .section{padding:64px 0}
  .section--tight{padding:52px 0}
  .page-hero{padding:28px 0 56px}
}
@media (max-width:768px){
  .container{padding:0 20px}
  .header-inner{min-height:68px;gap:14px}
  .main-nav{top:68px}
  .logo-text strong{font-size:15.5px}
  .logo-text em{font-size:10px;letter-spacing:.14em}
  .logo-mark{width:36px;height:36px}
  .btn-nav .btn-label{display:none}
  .btn-nav{padding:0;width:44px;min-width:44px;justify-content:center}
  .btn-nav .arrow{transform:none}
  h1{font-size:clamp(30px,7.4vw,40px)}
  .hero-sub{font-size:16px}
  .steps-wrap{gap:52px}
  .acc-item summary{font-size:16.5px;padding:20px 2px;gap:14px}
  .acc-body{padding-bottom:22px}
  .cta-band{padding:56px 0}
  .site-footer{padding:48px 0 24px}
  .footer-bottom{flex-direction:column;gap:8px}
}
@media (max-width:480px){
  .hero-actions{flex-direction:column;align-items:stretch}
  .hero-actions .btn{width:100%}
  .anchor-chips{gap:8px}
  .anchor-chips a{font-size:12px;padding:6px 12px}
  .precheck-grid{grid-template-columns:1fr}
  .cta-actions{flex-direction:column;align-items:stretch}
  .cta-actions .btn{width:100%}
  .footer-grid{grid-template-columns:1fr;gap:30px}
  .step-num{font-size:56px}
  .section{padding:52px 0}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
  .reveal{opacity:1;transform:none}
}

/* roulang page: category2 */
:root{
  --ink:#111514;
  --ink-2:#2A312F;
  --paper:#F5F3EC;
  --paper-2:#EBE7DC;
  --line:#D8D3C7;
  --muted:#6E746F;
  --brand:#1F5C55;
  --brand-2:#2F7A70;
  --signal:#D9F24F;
  --danger:#B3402E;
  --success:#2F6F4E;
  --dark:#0E1211;
  --r-card:8px;
  --r-img:4px;
  --r-btn:4px;
  --shadow:0 12px 32px rgba(17,21,20,.08);
  --font:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --ease:cubic-bezier(.2,.7,.2,1);
  --header-h:76px;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font);
  font-size:16px;
  line-height:1.8;
  color:var(--ink);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;border-radius:var(--r-img);}
a{color:inherit;text-decoration:none;}
h1,h2,h3,h4,p,ul,ol,figure,blockquote{margin:0;}
ul,ol{padding:0;list-style:none;}
button{font-family:inherit;font-size:inherit;color:inherit;background:none;border:0;cursor:pointer;}
input,textarea,select{font-family:inherit;font-size:inherit;color:inherit;}
:focus-visible{outline:2px solid var(--signal);outline-offset:2px;border-radius:2px;}
::selection{background:var(--signal);color:var(--ink);}

.skip-link{
  position:absolute;left:-9999px;top:0;z-index:200;
  background:var(--ink);color:var(--signal);
  padding:10px 16px;border-radius:0 0 var(--r-btn) 0;
}
.skip-link:focus{left:0;}

.container{
  width:100%;
  max-width:1200px;
  margin:0 auto;
  padding:0 28px;
}

/* ---------- header ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:rgba(245,243,236,.92);
  backdrop-filter:saturate(140%) blur(10px);
  border-bottom:1px solid var(--line);
}
.header-inner{
  display:flex;
  align-items:center;
  gap:24px;
  min-height:var(--header-h);
}
.logo{
  display:inline-flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
}
.logo-mark{
  width:38px;height:38px;
  display:inline-flex;align-items:center;justify-content:center;
  border:1px solid var(--ink);
  border-radius:50%;
  color:var(--ink);
  transition:background .2s var(--ease),color .2s var(--ease),transform .2s var(--ease);
}
.logo:hover .logo-mark{background:var(--ink);color:var(--signal);transform:translateY(-1px);}
.logo-text{display:flex;flex-direction:column;line-height:1.15;}
.logo-text strong{font-size:16px;font-weight:800;letter-spacing:-.01em;}
.logo-text em{font-size:11px;font-style:normal;color:var(--muted);letter-spacing:.16em;}

.main-nav{
  display:flex;
  align-items:center;
  gap:22px;
  margin-left:auto;
  font-size:14.5px;
}
.main-nav a{
  position:relative;
  padding:6px 0;
  color:var(--ink-2);
  transition:color .2s var(--ease);
  white-space:nowrap;
}
.main-nav a::after{
  content:"";
  position:absolute;
  left:0;bottom:0;
  width:0;height:2px;
  background:var(--signal);
  transition:width .22s var(--ease);
}
.main-nav a:hover{color:var(--ink);}
.main-nav a:hover::after{width:100%;}
.main-nav a.active{color:var(--ink);font-weight:600;}
.main-nav a.active::after{width:100%;}
.drawer-cta{display:none;}

.header-actions{
  display:flex;
  align-items:center;
  gap:12px;
  flex:0 0 auto;
}
.btn-text{
  font-size:14px;
  color:var(--ink-2);
  padding:6px 2px;
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.btn-text:hover{color:var(--brand);border-color:var(--brand);}

.nav-toggle{
  display:none;
  width:44px;height:44px;
  border:1px solid var(--line);
  border-radius:var(--r-btn);
  position:relative;
  background:var(--paper);
}
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after{
  position:absolute;
  left:50%;top:50%;
  width:18px;height:1.6px;
  background:var(--ink);
  content:"";
  transform:translate(-50%,-50%);
  transition:transform .22s var(--ease),opacity .18s var(--ease);
}
.nav-toggle span::before{transform:translate(-50%,-7px);}
.nav-toggle span::after{transform:translate(-50%,5px);}
body.nav-open .nav-toggle span{background:transparent;}
body.nav-open .nav-toggle span::before{transform:translate(-50%,-50%) rotate(45deg);}
body.nav-open .nav-toggle span::after{transform:translate(-50%,-50%) rotate(-45deg);}
.nav-backdrop{
  position:fixed;inset:0;
  background:rgba(14,18,17,.42);
  opacity:0;visibility:hidden;
  transition:opacity .22s var(--ease),visibility .22s var(--ease);
  z-index:85;
}
body.nav-open .nav-backdrop{opacity:1;visibility:visible;}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  min-height:46px;
  padding:0 22px;
  border-radius:var(--r-btn);
  border:1px solid transparent;
  font-size:15px;
  font-weight:600;
  letter-spacing:.01em;
  cursor:pointer;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .16s var(--ease);
}
.btn .arrow{transition:transform .2s var(--ease);}
.btn:hover .arrow{transform:translateX(3px);}
.btn:active{transform:translateY(1px);}
.btn-primary{background:var(--ink);color:var(--signal);}
.btn-primary:hover{background:var(--signal);color:var(--ink);}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--ink);}
.btn-ghost:hover{background:var(--ink);color:var(--paper);}
.btn-signal{background:var(--signal);color:var(--ink);}
.btn-signal:hover{background:var(--paper);color:var(--ink);}
.btn-sm{min-height:38px;padding:0 16px;font-size:14px;}
.btn-block{width:100%;}
.btn[disabled],.btn.is-disabled{opacity:.45;cursor:not-allowed;transform:none;}

/* ---------- page head ---------- */
.page-head{
  position:relative;
  color:var(--paper);
  background:
    linear-gradient(100deg,rgba(14,18,17,.96) 0%,rgba(14,18,17,.86) 46%,rgba(14,18,17,.62) 100%),
    url("/assets/images/backpic/back-2.webp") center/cover no-repeat;
  border-bottom:1px solid var(--line);
  overflow:hidden;
}
.page-head::after{
  content:"";
  position:absolute;
  inset:0;
  background-image:linear-gradient(rgba(245,243,236,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(245,243,236,.05) 1px,transparent 1px);
  background-size:64px 64px;
  pointer-events:none;
  opacity:.55;
}
.page-head .container{position:relative;z-index:2;}
.head-inner{padding:36px 0 64px;max-width:820px;}
.breadcrumb{
  display:flex;
  align-items:center;
  gap:8px;
  font-size:13px;
  color:rgba(245,243,236,.66);
  margin-bottom:26px;
  flex-wrap:wrap;
}
.breadcrumb a{color:rgba(245,243,236,.82);transition:color .2s var(--ease);}
.breadcrumb a:hover{color:var(--signal);}
.breadcrumb .sep{opacity:.5;}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:12px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--signal);
  border:1px solid rgba(217,242,79,.4);
  border-radius:999px;
  padding:5px 12px;
  margin-bottom:20px;
}
.eyebrow i{
  width:6px;height:6px;border-radius:50%;
  background:var(--signal);
  font-style:normal;
}
.page-head h1{
  font-size:clamp(34px,5.2vw,60px);
  line-height:1.08;
  letter-spacing:-.02em;
  font-weight:800;
  margin-bottom:20px;
}
.page-head h1 span{color:var(--signal);}
.head-lead{
  font-size:16.5px;
  line-height:1.9;
  color:rgba(245,243,236,.78);
  max-width:660px;
  margin-bottom:30px;
}
.head-actions{
  display:flex;
  flex-wrap:wrap;
  gap:12px;
  margin-bottom:34px;
}
.head-actions .btn-ghost{color:var(--paper);border-color:rgba(245,243,236,.5);}
.head-actions .btn-ghost:hover{background:var(--paper);color:var(--ink);border-color:var(--paper);}
.head-facts{
  display:flex;
  flex-wrap:wrap;
  gap:14px 34px;
  padding-top:24px;
  border-top:1px solid rgba(245,243,236,.16);
  font-size:13px;
  color:rgba(245,243,236,.7);
}
.head-facts b{
  display:block;
  font-family:var(--mono);
  font-size:19px;
  font-weight:600;
  color:var(--paper);
  letter-spacing:.02em;
  margin-bottom:2px;
}

/* ---------- version tabs ---------- */
.ver-tabs-wrap{
  position:sticky;
  top:var(--header-h);
  z-index:60;
  background:rgba(245,243,236,.95);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.ver-tabs{
  display:flex;
  align-items:center;
  gap:10px;
  padding:14px 0;
  overflow-x:auto;
  scrollbar-width:thin;
}
.ver-tabs .tab-label{
  font-size:12px;
  letter-spacing:.14em;
  color:var(--muted);
  margin-right:6px;
  white-space:nowrap;
}
.ver-tab{
  display:inline-flex;
  align-items:center;
  gap:8px;
  min-height:38px;
  padding:0 16px;
  border:1px solid var(--line);
  border-radius:999px;
  font-size:14px;
  color:var(--ink-2);
  background:var(--paper);
  white-space:nowrap;
  transition:border-color .2s var(--ease),background .2s var(--ease),color .2s var(--ease);
}
.ver-tab .num{font-family:var(--mono);font-size:12px;color:var(--muted);}
.ver-tab:hover{border-color:var(--brand);color:var(--brand);}
.ver-tab.is-active{
  background:var(--ink);
  color:var(--signal);
  border-color:var(--ink);
}
.ver-tab.is-active .num{color:rgba(217,242,79,.75);}

/* ---------- section base ---------- */
.section{padding:76px 0;}
.section.tight{padding:56px 0;}
.section.alt{background:var(--paper-2);}
.sec-head{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:24px;
  margin-bottom:38px;
  flex-wrap:wrap;
}
.sec-head h2{
  font-size:clamp(26px,3.4vw,40px);
  line-height:1.16;
  letter-spacing:-.015em;
  font-weight:800;
}
.sec-head p{
  font-size:15px;
  color:var(--muted);
  max-width:620px;
  margin-top:12px;
}
.sec-kicker{
  display:inline-block;
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.2em;
  color:var(--brand);
  margin-bottom:12px;
}
.link-more{
  font-size:14px;
  font-weight:600;
  color:var(--brand);
  display:inline-flex;
  align-items:center;
  gap:6px;
  border-bottom:1px solid transparent;
  transition:border-color .2s var(--ease),gap .2s var(--ease);
}
.link-more:hover{border-color:var(--brand);gap:10px;}

/* ---------- compare table ---------- */
.table-wrap{
  overflow-x:auto;
  border:1px solid var(--line);
  border-radius:var(--r-card);
  background:var(--paper);
  scrollbar-width:thin;
}
table.compare{
  width:100%;
  min-width:760px;
  border-collapse:collapse;
  font-size:14.5px;
}
table.compare caption{
  text-align:left;
  padding:16px 18px;
  font-size:13px;
  color:var(--muted);
  border-bottom:1px solid var(--line);
}
table.compare th,
table.compare td{
  padding:15px 18px;
  text-align:left;
  border-bottom:1px solid var(--line);
  vertical-align:top;
}
table.compare thead th{
  font-size:12px;
  letter-spacing:.14em;
  color:var(--muted);
  font-weight:600;
  background:var(--paper-2);
  white-space:nowrap;
}
table.compare thead th .ver-name{
  display:block;
  font-family:var(--mono);
  font-size:14px;
  letter-spacing:0;
  color:var(--ink);
  margin-top:4px;
}
table.compare thead th.is-current{
  background:var(--ink);
  color:rgba(245,243,236,.7);
}
table.compare thead th.is-current .ver-name{color:var(--signal);}
table.compare tbody th{
  font-weight:600;
  color:var(--ink-2);
  white-space:nowrap;
}
table.compare tbody tr{transition:background .18s var(--ease);}
table.compare tbody tr:hover{background:var(--paper-2);}
table.compare tbody tr:last-child th,
table.compare tbody tr:last-child td{border-bottom:0;}
table.compare td.is-current{background:rgba(31,92,85,.06);font-weight:600;color:var(--brand);}
.badge{
  display:inline-block;
  font-size:12px;
  line-height:1.6;
  padding:2px 9px;
  border-radius:999px;
  border:1px solid var(--line);
  color:var(--muted);
  background:var(--paper);
}
.badge.signal{background:var(--signal);border-color:var(--signal);color:var(--ink);font-weight:600;}
.badge.brand{border-color:rgba(31,92,85,.35);color:var(--brand);background:rgba(31,92,85,.07);}

/* ---------- version cards ---------- */
.ver-cards{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:24px;
}
.ver-card{
  display:flex;
  flex-direction:column;
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  overflow:hidden;
  transition:transform .22s var(--ease),border-color .22s var(--ease),box-shadow .22s var(--ease);
}
.ver-card:hover{transform:translateY(-2px);border-color:var(--brand);box-shadow:var(--shadow);}
.ver-card.is-current{border-color:var(--ink);box-shadow:0 0 0 1px var(--ink) inset;}
.ver-card .thumb{
  position:relative;
  aspect-ratio:16/9;
  background:var(--paper-2);
  overflow:hidden;
}
.ver-card .thumb img{
  width:100%;height:100%;
  object-fit:cover;
  border-radius:0;
  transition:transform .35s var(--ease);
}
.ver-card:hover .thumb img{transform:scale(1.02);}
.ver-card .thumb .badge{
  position:absolute;
  left:12px;top:12px;
  background:rgba(245,243,236,.94);
  border-color:transparent;
}
.ver-card .body{
  padding:22px 22px 24px;
  display:flex;
  flex-direction:column;
  gap:14px;
  flex:1;
}
.ver-card h3{
  font-size:21px;
  font-weight:800;
  letter-spacing:-.01em;
  display:flex;
  align-items:baseline;
  gap:8px;
}
.ver-card h3 .vnum{font-family:var(--mono);font-size:14px;color:var(--brand);font-weight:600;}
.ver-card .desc{font-size:14.5px;color:var(--muted);line-height:1.8;}
.feat-list{
  display:flex;
  flex-direction:column;
  gap:9px;
  font-size:14px;
  color:var(--ink-2);
}
.feat-list li{
  display:flex;
  gap:9px;
  align-items:flex-start;
  line-height:1.7;
}
.feat-list li::before{
  content:"";
  flex:0 0 auto;
  width:6px;height:6px;
  margin-top:8px;
  border-radius:50%;
  background:var(--brand);
}
.ver-card .card-foot{
  margin-top:auto;
  padding-top:16px;
  border-top:1px solid var(--line);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
}
.ver-card .meta{font-size:12.5px;color:var(--muted);font-family:var(--mono);}

/* ---------- compatibility ---------- */
.compat-grid{
  display:grid;
  grid-template-columns:minmax(0,7fr) minmax(0,5fr);
  gap:40px;
  align-items:start;
}
.compat-list{
  border:1px solid var(--line);
  border-radius:var(--r-card);
  overflow:hidden;
  background:var(--paper);
}
.compat-row{
  display:grid;
  grid-template-columns:minmax(0,1.15fr) minmax(0,1fr) minmax(0,1.4fr);
  gap:16px;
  padding:15px 18px;
  border-bottom:1px solid var(--line);
  font-size:14px;
  transition:background .18s var(--ease);
}
.compat-row:last-child{border-bottom:0;}
.compat-row:hover{background:var(--paper-2);}
.compat-row.head{
  background:var(--paper-2);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--muted);
  font-weight:600;
}
.compat-row .key{font-weight:600;color:var(--ink-2);}
.compat-row .val{color:var(--muted);}
.compat-row .ver{font-family:var(--mono);font-size:13px;color:var(--brand);font-weight:600;}

.side-notes{
  background:var(--dark);
  color:var(--paper);
  border-radius:var(--r-card);
  padding:30px 28px;
  border:1px solid rgba(245,243,236,.12);
}
.side-notes h3{
  font-size:19px;
  font-weight:800;
  margin-bottom:16px;
  letter-spacing:-.01em;
}
.side-notes ul{
  display:flex;
  flex-direction:column;
  gap:14px;
  font-size:14px;
  line-height:1.8;
  color:rgba(245,243,236,.76);
}
.side-notes li{
  padding-left:16px;
  position:relative;
}
.side-notes li::before{
  content:"";
  position:absolute;
  left:0;top:9px;
  width:7px;height:1.6px;
  background:var(--signal);
}
.side-notes .note-foot{
  margin-top:22px;
  padding-top:18px;
  border-top:1px solid rgba(245,243,236,.14);
  font-size:12.5px;
  color:rgba(245,243,236,.55);
  font-family:var(--mono);
}

/* ---------- update timeline ---------- */
.timeline{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:0;
  border-top:1px solid var(--line);
}
.tl-item{
  padding:28px 26px 30px 0;
  border-right:1px solid var(--line);
  position:relative;
}
.tl-item:last-child{border-right:0;}
.tl-item .dot{
  position:absolute;
  top:-4.5px;left:0;
  width:8px;height:8px;
  border-radius:50%;
  background:var(--brand);
}
.tl-item .date{
  font-family:var(--mono);
  font-size:12.5px;
  color:var(--muted);
  margin-bottom:10px;
  display:block;
}
.tl-item h3{font-size:17px;font-weight:700;margin-bottom:8px;}
.tl-item p{font-size:14px;color:var(--muted);line-height:1.8;}

/* ---------- faq ---------- */
.faq-list{
  border-top:1px solid var(--line);
  max-width:900px;
}
.faq-item{border-bottom:1px solid var(--line);}
.faq-q{
  width:100%;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  padding:22px 4px;
  text-align:left;
  transition:color .2s var(--ease);
}
.faq-q h3{
  font-size:17.5px;
  font-weight:700;
  line-height:1.6;
  letter-spacing:-.01em;
}
.faq-q:hover{color:var(--brand);}
.faq-icon{
  flex:0 0 auto;
  width:26px;height:26px;
  border:1px solid var(--line);
  border-radius:50%;
  position:relative;
  transition:transform .24s var(--ease),border-color .2s var(--ease),background .2s var(--ease);
}
.faq-icon::before,
.faq-icon::after{
  content:"";
  position:absolute;
  left:50%;top:50%;
  width:11px;height:1.4px;
  background:var(--ink);
  transform:translate(-50%,-50%);
  transition:transform .24s var(--ease),background .2s var(--ease);
}
.faq-icon::after{transform:translate(-50%,-50%) rotate(90deg);}
.faq-item.is-open .faq-icon{transform:rotate(45deg);border-color:var(--ink);background:var(--signal);}
.faq-a{
  max-height:0;
  overflow:hidden;
  transition:max-height .3s var(--ease),opacity .25s var(--ease);
  opacity:0;
}
.faq-item.is-open .faq-a{opacity:1;}
.faq-a p{
  padding:0 4px 24px;
  font-size:15px;
  line-height:1.85;
  color:var(--muted);
  max-width:760px;
}

/* ---------- cta band ---------- */
.cta-band{
  background:var(--dark);
  color:var(--paper);
  position:relative;
  overflow:hidden;
}
.cta-band::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:linear-gradient(rgba(245,243,236,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(245,243,236,.045) 1px,transparent 1px);
  background-size:56px 56px;
  pointer-events:none;
}
.cta-inner{
  position:relative;
  z-index:2;
  display:grid;
  grid-template-columns:minmax(0,1.35fr) minmax(0,1fr);
  gap:48px;
  align-items:center;
  padding:72px 0;
}
.cta-inner h2{
  font-size:clamp(26px,3.4vw,38px);
  line-height:1.16;
  letter-spacing:-.015em;
  font-weight:800;
  margin-bottom:14px;
}
.cta-inner p{font-size:15px;color:rgba(245,243,236,.72);max-width:520px;}
.cta-actions{display:flex;flex-wrap:wrap;gap:12px;}
.cta-actions .btn-ghost{color:var(--paper);border-color:rgba(245,243,236,.4);}
.cta-actions .btn-ghost:hover{background:var(--paper);color:var(--ink);border-color:var(--paper);}
.cta-note{
  margin-top:16px;
  font-size:12.5px;
  color:rgba(245,243,236,.5);
  font-family:var(--mono);
}

/* ---------- footer ---------- */
.site-footer{
  background:var(--dark);
  color:var(--paper);
  border-top:1px solid rgba(245,243,236,.12);
  padding:64px 0 0;
}
.footer-grid{
  display:grid;
  grid-template-columns:minmax(0,1.6fr) repeat(3,minmax(0,1fr));
  gap:40px;
  padding-bottom:48px;
}
.footer-logo{
  display:flex;
  align-items:center;
  gap:10px;
  margin-bottom:16px;
}
.footer-logo .logo-mark{border-color:rgba(245,243,236,.5);color:var(--paper);}
.footer-logo .logo-text strong{color:var(--paper);}
.footer-logo .logo-text em{color:rgba(245,243,236,.55);}
.footer-brand p{
  font-size:14px;
  line-height:1.85;
  color:rgba(245,243,236,.62);
  max-width:360px;
}
.footer-col h4{
  font-size:12px;
  letter-spacing:.16em;
  color:rgba(245,243,236,.5);
  font-weight:600;
  margin-bottom:16px;
}
.footer-col ul{display:flex;flex-direction:column;gap:11px;}
.footer-col a,
.footer-col li{
  font-size:14px;
  color:rgba(245,243,236,.78);
  transition:color .2s var(--ease);
}
.footer-col a:hover{color:var(--signal);}
.footer-bottom{
  border-top:1px solid rgba(245,243,236,.12);
  padding:22px 0;
  display:flex;
  justify-content:space-between;
  gap:16px;
  flex-wrap:wrap;
  font-size:12.5px;
  color:rgba(245,243,236,.5);
}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .5s var(--ease),transform .5s var(--ease);}
.reveal.is-in{opacity:1;transform:none;}

/* ---------- responsive ---------- */
@media (max-width:1200px){
  .container{padding:0 24px;}
  .main-nav{gap:16px;font-size:14px;}
}
@media (max-width:1024px){
  .ver-cards{grid-template-columns:repeat(2,minmax(0,1fr));}
  .compat-grid{grid-template-columns:1fr;gap:28px;}
  .cta-inner{grid-template-columns:1fr;gap:30px;}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:32px;}
  .timeline{grid-template-columns:1fr;border-top:0;}
  .tl-item{border-right:0;border-top:1px solid var(--line);padding:24px 0 24px 22px;}
  .tl-item .dot{left:0;top:30px;}
}
@media (max-width:992px){
  .main-nav{display:none;}
  .nav-toggle{display:inline-block;}
  .main-nav{
    display:flex;
    position:fixed;
    top:0;right:0;
    height:100vh;
    width:min(84vw,340px);
    background:var(--paper);
    border-left:1px solid var(--line);
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding:calc(var(--header-h) + 18px) 24px 28px;
    transform:translateX(105%);
    transition:transform .26s var(--ease);
    z-index:90;
    overflow-y:auto;
    box-shadow:-16px 0 40px rgba(17,21,20,.12);
  }
  body.nav-open .main-nav{transform:translateX(0);}
  .main-nav a{
    padding:14px 2px;
    border-bottom:1px solid var(--line);
    font-size:16px;
  }
  .main-nav a::after{display:none;}
  .main-nav a.active{color:var(--brand);font-weight:700;}
  .drawer-cta{
    display:flex;
    margin-top:auto;
    border-bottom:0 !important;
    padding-top:22px !important;
  }
  .drawer-cta .btn{width:100%;}
  .btn-nav{display:none;}
  .page-head .head-inner{padding:28px 0 48px;}
}
@media (max-width:768px){
  .section{padding:56px 0;}
  .section.tight{padding:44px 0;}
  .ver-cards{grid-template-columns:1fr;}
  .head-facts{gap:12px 24px;}
  .head-facts b{font-size:17px;}
  .ver-tabs{padding:12px 0;}
  .compat-row{grid-template-columns:1fr;gap:4px;padding:14px 16px;}
  .compat-row.head{display:none;}
  .compat-row .key{font-size:13px;color:var(--muted);}
  .sec-head{margin-bottom:28px;}
  .cta-inner{padding:56px 0;}
  table.compare{min-width:680px;}
  table.compare th:first-child,
  table.compare td:first-child{
    position:sticky;
    left:0;
    background:var(--paper);
    z-index:3;
    box-shadow:1px 0 0 var(--line);
  }
  table.compare thead th:first-child{background:var(--paper-2);}
}
@media (max-width:520px){
  .container{padding:0 18px;}
  .btn{width:100%;}
  .head-actions .btn,
  .cta-actions .btn{width:100%;}
  .header-actions{gap:8px;}
  .btn-text{display:none;}
  .footer-grid{grid-template-columns:1fr;gap:28px;}
  .footer-bottom{flex-direction:column;gap:8px;}
  .page-head h1{font-size:clamp(30px,8.6vw,40px);}
  .ver-card .body{padding:18px 18px 20px;}
  .faq-q h3{font-size:16px;}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .reveal{opacity:1;transform:none;}
}

/* roulang page: category5 */
:root{
  --ink:#111514;
  --ink-2:#2A312F;
  --paper:#F5F3EC;
  --paper-2:#EBE7DC;
  --line:#D8D3C7;
  --muted:#6E746F;
  --brand:#1F5C55;
  --brand-2:#2F7A70;
  --signal:#D9F24F;
  --danger:#B3402E;
  --success:#2F6F4E;
  --dark:#0E1211;
  --radius:8px;
  --radius-sm:4px;
  --shadow-float:0 12px 32px rgba(17,21,20,.08);
  --ease:cubic-bezier(.2,.7,.2,1);
  --t:220ms;
  --container:1200px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
  font-size:16px;
  line-height:1.8;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,p,ul,ol,figure,blockquote{margin:0;padding:0}
ul,ol{list-style:none}
img{max-width:100%;display:block;border-radius:var(--radius-sm)}
a{color:inherit;text-decoration:none;transition:color var(--t) var(--ease),border-color var(--t) var(--ease),background-color var(--t) var(--ease)}
button{font:inherit;color:inherit}
svg{display:block}
::selection{background:var(--signal);color:var(--ink)}
:focus-visible{outline:2px solid var(--signal);outline-offset:2px;border-radius:2px}

.container{
  width:100%;
  max-width:var(--container);
  margin:0 auto;
  padding:0 32px;
}

/* ---------- Header ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:50;
  background:rgba(245,243,236,.94);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.header-inner{
  display:flex;
  align-items:center;
  gap:24px;
  min-height:76px;
}
.logo{
  display:flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
}
.logo-mark{
  width:38px;
  height:38px;
  display:grid;
  place-items:center;
  background:var(--ink);
  color:var(--paper);
  border-radius:6px;
  transition:background-color var(--t) var(--ease),color var(--t) var(--ease);
}
.logo:hover .logo-mark{background:var(--brand);color:var(--signal)}
.logo-text{display:flex;flex-direction:column;line-height:1.15}
.logo-text strong{font-size:15.5px;font-weight:800;letter-spacing:.01em}
.logo-text em{font-style:normal;font-size:11px;letter-spacing:.2em;color:var(--muted);margin-top:2px}
.main-nav{
  display:flex;
  align-items:center;
  gap:22px;
  margin-left:auto;
}
.main-nav a{
  position:relative;
  font-size:14.5px;
  color:var(--ink-2);
  padding:6px 2px 8px;
  white-space:nowrap;
}
.main-nav a::after{
  content:"";
  position:absolute;
  left:0;
  bottom:0;
  height:2px;
  width:0;
  background:var(--signal);
  transition:width var(--t) var(--ease);
}
.main-nav a:hover{color:var(--brand)}
.main-nav a:hover::after{width:100%}
.main-nav a.active{color:var(--ink);font-weight:700}
.main-nav a.active::after{width:100%;background:var(--signal)}
.header-actions{
  display:flex;
  align-items:center;
  gap:14px;
  margin-left:8px;
  position:relative;
  z-index:2;
}
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  height:46px;
  padding:0 22px;
  border-radius:var(--radius-sm);
  border:1px solid transparent;
  font-size:14.5px;
  font-weight:600;
  cursor:pointer;
  transition:background-color var(--t) var(--ease),color var(--t) var(--ease),border-color var(--t) var(--ease),transform var(--t) var(--ease);
}
.btn .arrow{transition:transform var(--t) var(--ease)}
.btn:hover .arrow{transform:translateX(3px)}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--ink);color:var(--signal);border-color:var(--ink)}
.btn-primary:hover{background:var(--signal);color:var(--ink)}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand);background:#fff}
.btn-sm{height:44px;padding:0 18px;font-size:14px}
.btn-nav{height:44px}
.btn-text{
  position:relative;
  font-size:14.5px;
  font-weight:600;
  color:var(--ink-2);
  padding:4px 0;
}
.btn-text::after{
  content:"";
  position:absolute;
  left:0;bottom:0;height:1px;width:0;
  background:var(--brand);
  transition:width var(--t) var(--ease);
}
.btn-text:hover{color:var(--brand)}
.btn-text:hover::after{width:100%}
.nav-toggle{
  display:none;
  position:relative;
  width:44px;height:44px;
  border:1px solid var(--line);
  border-radius:6px;
  background:transparent;
  cursor:pointer;
}
.nav-toggle span,
.nav-toggle::before,
.nav-toggle::after{
  content:"";
  position:absolute;
  left:12px;right:12px;
  height:1.6px;
  background:var(--ink);
  transition:transform var(--t) var(--ease),opacity var(--t) var(--ease);
}
.nav-toggle span{top:50%;transform:translateY(-50%)}
.nav-toggle::before{top:15px}
.nav-toggle::after{bottom:15px}
.nav-toggle[aria-expanded="true"] span{opacity:0}
.nav-toggle[aria-expanded="true"]::before{transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"]::after{transform:translateY(-6px) rotate(-45deg)}

/* ---------- Hero ---------- */
.page-hero{
  position:relative;
  background:var(--dark);
  color:var(--paper);
  padding:64px 0 76px;
  overflow:hidden;
  border-bottom:1px solid rgba(245,243,236,.08);
}
.page-hero::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:url('/assets/images/backpic/back-3.webp');
  background-size:cover;
  background-position:center;
  opacity:.3;
}
.page-hero::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,rgba(14,18,17,.72),rgba(14,18,17,.95));
}
.page-hero .container{position:relative;z-index:1}
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-size:12.5px;
  color:rgba(245,243,236,.62);
  margin-bottom:28px;
}
.breadcrumb a{color:rgba(245,243,236,.78)}
.breadcrumb a:hover{color:var(--signal)}
.breadcrumb .sep{color:rgba(245,243,236,.34)}
.hero-grid{
  display:grid;
  grid-template-columns:1.45fr .85fr;
  gap:56px;
  align-items:end;
}
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  height:28px;
  padding:0 12px;
  border:1px solid rgba(217,242,79,.42);
  border-radius:999px;
  font-size:12px;
  letter-spacing:.14em;
  color:var(--signal);
  margin-bottom:22px;
}
.eyebrow::before{
  content:"";
  width:6px;height:6px;
  border-radius:50%;
  background:var(--signal);
}
.page-hero h1{
  font-size:clamp(32px,4.4vw,54px);
  line-height:1.12;
  letter-spacing:-.02em;
  font-weight:800;
  max-width:16em;
}
.page-hero .hero-lead{
  margin-top:22px;
  max-width:34em;
  font-size:16px;
  line-height:1.9;
  color:rgba(245,243,236,.78);
}
.hero-actions{
  display:flex;
  flex-wrap:wrap;
  gap:14px;
  margin-top:34px;
}
.hero-actions .btn-ghost{
  border-color:rgba(245,243,236,.34);
  color:var(--paper);
}
.hero-actions .btn-ghost:hover{
  background:rgba(245,243,236,.1);
  border-color:var(--signal);
  color:var(--signal);
}
.hero-aside{
  border:1px solid rgba(245,243,236,.18);
  border-radius:var(--radius);
  padding:24px;
  background:rgba(245,243,236,.04);
}
.hero-aside h2{
  font-size:13px;
  letter-spacing:.14em;
  color:rgba(245,243,236,.6);
  font-weight:600;
  margin-bottom:16px;
}
.hero-aside li{
  display:flex;
  gap:10px;
  align-items:flex-start;
  font-size:14px;
  line-height:1.7;
  color:rgba(245,243,236,.86);
  padding:9px 0;
  border-bottom:1px solid rgba(245,243,236,.1);
}
.hero-aside li:last-child{border-bottom:0;padding-bottom:0}
.hero-aside li svg{flex:0 0 auto;margin-top:3px;color:var(--signal)}

/* ---------- Sections ---------- */
.section{padding:88px 0}
.section-tight{padding:64px 0}
.section-alt{background:var(--paper-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.section-head{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:32px;
  margin-bottom:44px;
}
.section-head h2{
  font-size:clamp(24px,2.9vw,36px);
  line-height:1.22;
  letter-spacing:-.01em;
  font-weight:800;
  max-width:24em;
}
.section-head p{
  margin-top:12px;
  color:var(--muted);
  font-size:15px;
  max-width:36em;
}
.link-more{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:14px;
  font-weight:600;
  color:var(--brand);
  white-space:nowrap;
  padding-bottom:2px;
  border-bottom:1px solid transparent;
}
.link-more:hover{border-bottom-color:var(--brand)}
.link-more .arrow{transition:transform var(--t) var(--ease)}
.link-more:hover .arrow{transform:translateX(3px)}

/* ---------- Badge grid ---------- */
.badge-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:24px;
}
.badge-card{
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:var(--paper);
  padding:26px 22px;
  transition:transform var(--t) var(--ease),border-color var(--t) var(--ease),background-color var(--t) var(--ease);
}
.badge-card:hover{
  transform:translateY(-2px);
  border-color:var(--brand);
  background:#fff;
}
.badge-icon{
  width:44px;height:44px;
  display:grid;
  place-items:center;
  border-radius:var(--radius-sm);
  background:var(--paper-2);
  color:var(--brand);
  margin-bottom:18px;
  transition:background-color var(--t) var(--ease),color var(--t) var(--ease);
}
.badge-card:hover .badge-icon{background:var(--ink);color:var(--signal)}
.badge-card h3{
  font-size:17px;
  font-weight:700;
  margin-bottom:8px;
}
.badge-card p{
  font-size:14px;
  line-height:1.75;
  color:var(--muted);
}

/* ---------- Document list ---------- */
.doc-list{
  border-top:1px solid var(--line);
}
.doc-item{
  display:grid;
  grid-template-columns:44px 1fr auto;
  gap:20px;
  align-items:center;
  padding:22px 16px;
  border-bottom:1px solid var(--line);
  transition:background-color var(--t) var(--ease);
}
.doc-item:hover{background:var(--paper-2)}
.doc-index{
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:12px;
  color:var(--muted);
  letter-spacing:.1em;
}
.doc-main h3{
  font-size:16px;
  font-weight:700;
  margin-bottom:4px;
}
.doc-main p{
  font-size:13.5px;
  color:var(--muted);
  line-height:1.7;
}
.doc-action{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-size:13.5px;
  font-weight:600;
  color:var(--brand);
  padding:8px 14px;
  border:1px solid var(--line);
  border-radius:999px;
  background:var(--paper);
  transition:border-color var(--t) var(--ease),background-color var(--t) var(--ease),color var(--t) var(--ease);
}
.doc-item:hover .doc-action{border-color:var(--brand);background:var(--brand);color:var(--paper)}

/* ---------- Table ---------- */
.table-wrap{
  border:1px solid var(--line);
  border-radius:var(--radius);
  overflow-x:auto;
  background:var(--paper);
  -webkit-overflow-scrolling:touch;
}
table{
  width:100%;
  min-width:760px;
  border-collapse:collapse;
  text-align:left;
}
thead th{
  font-size:12px;
  letter-spacing:.12em;
  color:var(--muted);
  font-weight:600;
  padding:16px 20px;
  border-bottom:1px solid var(--line);
  background:var(--paper-2);
  white-space:nowrap;
}
tbody td{
  padding:16px 20px;
  font-size:14.5px;
  border-bottom:1px solid var(--line);
  color:var(--ink-2);
  vertical-align:top;
}
tbody tr:last-child td{border-bottom:0}
tbody tr{transition:background-color var(--t) var(--ease)}
tbody tr:hover{background:var(--paper-2)}
tbody td:first-child{
  font-weight:700;
  color:var(--ink);
  position:sticky;
  left:0;
  background:var(--paper);
  z-index:1;
}
tbody tr:hover td:first-child{background:var(--paper-2)}
thead th:first-child{position:sticky;left:0;z-index:2}
.table-note{
  margin-top:14px;
  font-size:13px;
  color:var(--muted);
}

/* ---------- Check flow ---------- */
.flow{
  display:grid;
  grid-template-columns:.9fr 1.1fr;
  gap:56px;
  align-items:center;
}
.flow-figure{
  border-radius:var(--radius);
  overflow:hidden;
  border:1px solid var(--line);
  background:var(--paper-2);
}
.flow-figure img{
  width:100%;
  aspect-ratio:4/3;
  object-fit:cover;
  border-radius:0;
  transition:transform 400ms var(--ease);
}
.flow-figure:hover img{transform:scale(1.02)}
.flow-steps li{
  display:grid;
  grid-template-columns:56px 1fr;
  gap:18px;
  padding:20px 0;
  border-bottom:1px solid var(--line);
}
.flow-steps li:first-child{padding-top:0}
.flow-steps li:last-child{border-bottom:0;padding-bottom:0}
.step-num{
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;
  font-size:26px;
  line-height:1;
  color:var(--line);
  font-weight:700;
  letter-spacing:-.02em;
  transition:color var(--t) var(--ease);
}
.flow-steps li:hover .step-num{color:var(--brand)}
.flow-steps h3{
  font-size:17px;
  font-weight:700;
  margin-bottom:6px;
}
.flow-steps p{
  font-size:14px;
  color:var(--muted);
  line-height:1.75;
}

/* ---------- FAQ ---------- */
.faq-list{
  border-top:1px solid var(--line);
  max-width:860px;
}
.faq-item{border-bottom:1px solid var(--line)}
.faq-q{
  width:100%;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  padding:22px 4px;
  background:none;
  border:0;
  cursor:pointer;
  text-align:left;
  font-size:17px;
  font-weight:700;
  line-height:1.5;
  color:var(--ink);
  transition:color var(--t) var(--ease);
}
.faq-q:hover{color:var(--brand)}
.faq-icon{
  position:relative;
  flex:0 0 auto;
  width:22px;height:22px;
  border:1px solid var(--line);
  border-radius:50%;
  transition:transform var(--t) var(--ease),border-color var(--t) var(--ease),background-color var(--t) var(--ease);
}
.faq-icon::before,
.faq-icon::after{
  content:"";
  position:absolute;
  top:50%;left:50%;
  background:var(--ink-2);
  transform:translate(-50%,-50%);
  transition:background-color var(--t) var(--ease);
}
.faq-icon::before{width:9px;height:1.4px}
.faq-icon::after{width:1.4px;height:9px}
.faq-item.is-open .faq-icon{transform:rotate(45deg);border-color:var(--brand);background:var(--signal)}
.faq-item.is-open .faq-icon::before,
.faq-item.is-open .faq-icon::after{background:var(--ink)}
.faq-a-wrap{
  overflow:hidden;
  max-height:0;
  transition:max-height 300ms var(--ease);
}
.faq-a{
  padding:0 4px 24px;
  font-size:14.5px;
  line-height:1.85;
  color:var(--muted);
  max-width:44em;
}

/* ---------- CTA ---------- */
.cta-panel{
  border:1px solid var(--line);
  border-left:3px solid var(--brand);
  border-radius:var(--radius);
  background:#fff;
  padding:44px;
  display:grid;
  grid-template-columns:1.3fr .7fr;
  gap:40px;
  align-items:center;
}
.cta-panel h2{
  font-size:clamp(22px,2.6vw,32px);
  line-height:1.25;
  font-weight:800;
  letter-spacing:-.01em;
}
.cta-panel p{
  margin-top:14px;
  font-size:15px;
  color:var(--muted);
  max-width:34em;
}
.cta-actions{
  display:flex;
  flex-direction:column;
  gap:12px;
}
.cta-actions .btn{width:100%}
.cta-meta{
  margin-top:16px;
  font-size:12.5px;
  color:var(--muted);
  letter-spacing:.02em;
}

/* ---------- Footer ---------- */
.site-footer{
  background:var(--dark);
  color:rgba(245,243,236,.72);
  padding:64px 0 28px;
  border-top:1px solid var(--line);
  margin-top:0;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1fr;
  gap:40px;
  padding-bottom:44px;
  border-bottom:1px solid rgba(245,243,236,.12);
}
.footer-logo{
  display:flex;
  align-items:center;
  gap:10px;
  margin-bottom:16px;
}
.footer-logo .logo-mark{
  width:36px;height:36px;
  background:rgba(245,243,236,.1);
  color:var(--signal);
  border-radius:6px;
}
.footer-logo .logo-text strong{color:var(--paper);font-size:15px;font-weight:800}
.footer-logo .logo-text em{color:rgba(245,243,236,.5)}
.footer-brand p{
  font-size:13.5px;
  line-height:1.85;
  max-width:30em;
  color:rgba(245,243,236,.62);
}
.footer-col h4{
  font-size:12.5px;
  letter-spacing:.14em;
  color:rgba(245,243,236,.5);
  font-weight:600;
  margin-bottom:16px;
}
.footer-col li{
  font-size:14px;
  padding:6px 0;
  color:rgba(245,243,236,.72);
}
.footer-col a{color:rgba(245,243,236,.78)}
.footer-col a:hover{color:var(--signal)}
.footer-bottom{
  display:flex;
  justify-content:space-between;
  gap:16px;
  flex-wrap:wrap;
  padding-top:24px;
  font-size:12.5px;
  color:rgba(245,243,236,.46);
}

/* ---------- Reveal ---------- */
.reveal{transition:opacity .55s var(--ease),transform .55s var(--ease)}
.js-reveal .reveal{opacity:0;transform:translateY(12px)}
.js-reveal .reveal.is-visible{opacity:1;transform:none}

/* ---------- Responsive ---------- */
@media (max-width:1200px){
  .container{padding:0 24px}
  .header-inner{gap:16px}
  .main-nav{gap:16px}
  .main-nav a{font-size:14px}
  .hero-grid{gap:40px}
  .flow{gap:40px}
}
@media (max-width:992px){
  .hero-grid{grid-template-columns:1fr;align-items:start}
  .hero-aside{max-width:520px}
  .badge-grid{grid-template-columns:repeat(2,1fr)}
  .flow{grid-template-columns:1fr}
  .flow-figure{order:2}
  .cta-panel{grid-template-columns:1fr;padding:36px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .section{padding:72px 0}
  .section-tight{padding:56px 0}
  .main-nav{gap:14px}
  .header-actions .btn-text{display:none}
}
@media (max-width:768px){
  .container{padding:0 20px}
  .site-header{position:sticky}
  .nav-toggle{display:block}
  .header-actions{margin-left:auto}
  .main-nav{
    position:fixed;
    top:0;right:0;
    height:100vh;
    width:min(320px,86vw);
    background:var(--paper);
    border-left:1px solid var(--line);
    flex-direction:column;
    align-items:stretch;
    gap:0;
    margin:0;
    padding:96px 24px 32px;
    overflow-y:auto;
    transform:translateX(100%);
    transition:transform var(--t) var(--ease);
    z-index:40;
    box-shadow:var(--shadow-float);
  }
  .main-nav.is-open{transform:none}
  .main-nav a{
    width:100%;
    padding:14px 0;
    font-size:15px;
    border-bottom:1px solid var(--line);
  }
  .main-nav a::after{display:none}
  .main-nav a.active{color:var(--brand)}
  .main-nav a.active::before{
    content:"";
    display:inline-block;
    width:6px;height:6px;
    border-radius:50%;
    background:var(--signal);
    margin-right:8px;
    vertical-align:middle;
  }
  .page-hero{padding:40px 0 56px}
  .breadcrumb{margin-bottom:22px}
  .page-hero h1{font-size:clamp(28px,7vw,40px)}
  .hero-actions .btn{flex:1 1 100%}
  .section{padding:56px 0}
  .section-tight{padding:48px 0}
  .section-head{flex-direction:column;align-items:flex-start;gap:16px;margin-bottom:32px}
  .badge-grid{grid-template-columns:1fr;gap:16px}
  .doc-item{grid-template-columns:1fr;gap:12px;padding:20px 8px}
  .doc-index{display:none}
  .doc-action{justify-self:start}
  .flow-steps li{grid-template-columns:44px 1fr;gap:14px}
  .step-num{font-size:22px}
  .cta-panel{padding:28px 22px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
  .footer-bottom{flex-direction:column;gap:8px}
}
@media (max-width:480px){
  .container{padding:0 16px}
  .logo-text strong{font-size:14px}
  .logo-text em{font-size:10px;letter-spacing:.16em}
  .btn-nav .btn-label{display:none}
  .btn-nav{width:44px;padding:0;justify-content:center}
  .btn-nav .arrow{transform:none}
  .hero-actions .btn{width:100%}
  .footer-grid{grid-template-columns:1fr}
  .faq-q{font-size:15.5px;padding:18px 2px}
  .faq-a{font-size:14px}
  .cta-actions .btn{width:100%}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  .js-reveal .reveal{opacity:1;transform:none}
}

/* roulang page: category4 */
:root{
  --ink:#111514;
  --ink-2:#2A312F;
  --paper:#F5F3EC;
  --paper-2:#EBE7DC;
  --line:#D8D3C7;
  --muted:#6E746F;
  --brand:#1F5C55;
  --brand-2:#2F7A70;
  --signal:#D9F24F;
  --danger:#B3402E;
  --success:#2F6F4E;
  --dark:#0E1211;
  --r-xs:2px;
  --r-sm:4px;
  --r-md:8px;
  --r-lg:12px;
  --shadow:0 12px 32px rgba(17,21,20,.08);
  --ease:cubic-bezier(.2,.7,.2,1);
  --container:1200px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
  background:var(--paper);
  color:var(--ink);
  font-size:16px;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;border-radius:var(--r-sm)}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit}
h1,h2,h3,h4,p,ul,ol,figure{margin:0}
ul,ol{padding:0;list-style:none}
em{font-style:normal}
:focus-visible{outline:2px solid var(--signal);outline-offset:2px}
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 24px}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:200;
  background:var(--paper);
  border-bottom:1px solid var(--line);
}
.header-inner{display:flex;align-items:center;gap:28px;height:76px}
.logo{display:inline-flex;align-items:center;gap:10px;flex-shrink:0}
.logo-mark{
  display:inline-flex;align-items:center;justify-content:center;
  width:38px;height:38px;border:1px solid var(--ink);border-radius:var(--r-md);
  color:var(--ink);
}
.logo-text{display:flex;flex-direction:column;line-height:1.15}
.logo-text strong{font-size:15.5px;font-weight:800;letter-spacing:-.01em}
.logo-text em{font-size:11px;letter-spacing:.22em;color:var(--muted);font-weight:500}
.main-nav{display:flex;align-items:center;gap:22px;margin-left:8px}
.main-nav a{
  position:relative;padding:6px 0;font-size:14.5px;font-weight:500;color:var(--ink-2);
  transition:color .2s var(--ease);white-space:nowrap;
}
.main-nav a::after{
  content:"";position:absolute;left:0;right:0;bottom:-3px;height:2px;background:var(--signal);
  transform:scaleX(0);transform-origin:left center;transition:transform .22s var(--ease);
}
.main-nav a:hover{color:var(--ink)}
.main-nav a:hover::after,.main-nav a.active::after{transform:scaleX(1)}
.main-nav a.active{color:var(--ink);font-weight:700}
.header-actions{display:flex;align-items:center;gap:12px;margin-left:auto}
.btn-text{
  font-size:14px;font-weight:600;color:var(--ink-2);padding:8px 4px;
  border-bottom:1px solid transparent;transition:color .2s var(--ease),border-color .2s var(--ease);
}
.btn-text:hover{color:var(--ink);border-bottom-color:var(--ink)}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:46px;padding:0 22px;border:1px solid transparent;border-radius:var(--r-sm);
  font-size:14.5px;font-weight:600;cursor:pointer;text-align:center;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .12s var(--ease),opacity .2s var(--ease);
}
.btn .arrow{transition:transform .2s var(--ease)}
.btn:hover .arrow{transform:translateX(3px)}
.btn:active{transform:translateY(1px)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.45;cursor:not-allowed;transform:none}
.btn-primary{background:var(--ink);color:var(--signal);border-color:var(--ink)}
.btn-primary:hover{background:var(--signal);color:var(--ink);border-color:var(--signal)}
.btn-signal{background:var(--signal);color:var(--ink);border-color:var(--signal)}
.btn-signal:hover{background:var(--paper);color:var(--ink);border-color:var(--paper)}
.btn-outline{background:transparent;color:var(--ink);border-color:var(--line)}
.btn-outline:hover{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.btn-ghost{background:transparent;color:var(--paper);border-color:rgba(245,243,236,.45)}
.btn-ghost:hover{background:var(--paper);color:var(--ink);border-color:var(--paper)}
.btn-sm{height:40px;padding:0 16px;font-size:13.5px}
.btn-nav{height:42px;padding:0 16px}
.nav-toggle{
  display:none;width:44px;height:44px;border:1px solid var(--line);border-radius:var(--r-sm);
  background:transparent;cursor:pointer;padding:0;
}
.nav-toggle span{display:block;width:18px;height:2px;background:var(--ink);margin:0 auto;position:relative;transition:background .2s var(--ease)}
.nav-toggle span::before,.nav-toggle span::after{
  content:"";position:absolute;left:0;width:18px;height:2px;background:var(--ink);
  transition:transform .22s var(--ease);
}
.nav-toggle span::before{top:-6px}
.nav-toggle span::after{top:6px}
.nav-toggle[aria-expanded="true"] span{background:transparent}
.nav-toggle[aria-expanded="true"] span::before{transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span::after{transform:translateY(-6px) rotate(-45deg)}

/* ---------- hero ---------- */
.page-hero{padding:44px 0 64px;background:var(--paper);border-bottom:1px solid var(--line)}
.breadcrumb{display:flex;align-items:center;gap:8px;font-size:12.5px;color:var(--muted);margin-bottom:28px;flex-wrap:wrap}
.breadcrumb a{color:var(--muted);border-bottom:1px solid transparent;transition:color .2s var(--ease),border-color .2s var(--ease)}
.breadcrumb a:hover{color:var(--ink);border-bottom-color:var(--ink)}
.breadcrumb span{color:var(--line)}
.breadcrumb em{color:var(--ink-2);font-weight:600}
.hero-grid{display:grid;grid-template-columns:1.35fr .85fr;gap:56px;align-items:start}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;font-size:12px;font-weight:700;letter-spacing:.16em;
  color:var(--brand);background:rgba(31,92,85,.08);border:1px solid rgba(31,92,85,.18);
  padding:6px 12px;border-radius:999px;margin-bottom:20px;
}
.page-hero h1{
  font-size:clamp(34px,4.6vw,58px);line-height:1.06;letter-spacing:-.02em;font-weight:800;
  margin-bottom:20px;
}
.hero-lede{font-size:17px;line-height:1.85;color:var(--ink-2);max-width:660px;margin-bottom:32px}
.search-bar{position:relative;max-width:620px;margin-bottom:20px}
.search-bar svg{position:absolute;left:16px;top:50%;transform:translateY(-50%);color:var(--muted)}
.search-bar input{
  width:100%;height:54px;padding:0 16px 0 46px;border:1px solid var(--line);border-radius:var(--r-sm);
  background:#FFFDF8;font-size:15px;color:var(--ink);
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.search-bar input::placeholder{color:#9A9F98}
.search-bar input:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(217,242,79,.55)}
.filter-pills{display:flex;flex-wrap:wrap;gap:8px;max-width:640px}
.pill{
  height:36px;padding:0 14px;border:1px solid var(--line);border-radius:999px;background:transparent;
  font-size:13.5px;font-weight:600;color:var(--ink-2);cursor:pointer;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.pill:hover{border-color:var(--brand);color:var(--brand)}
.pill.is-on{background:var(--ink);border-color:var(--ink);color:var(--signal)}
.search-hint{margin-top:16px;font-size:13px;color:var(--muted);min-height:22px}
.hero-figure{
  position:relative;border:1px solid var(--line);border-radius:var(--r-md);overflow:hidden;background:var(--paper-2);
}
.hero-figure img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:0;transition:transform .28s var(--ease)}
.hero-figure:hover img{transform:scale(1.02)}
.hero-figure figcaption{
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  padding:14px 16px;font-size:12.5px;color:var(--muted);border-top:1px solid var(--line);background:var(--paper);
}
.hero-figure figcaption b{color:var(--ink);font-weight:700}

/* ---------- stat strip ---------- */
.stat-strip{background:var(--paper-2);border-bottom:1px solid var(--line)}
.stat-grid{display:grid;grid-template-columns:repeat(4,1fr)}
.stat{padding:26px 24px 26px 0;border-right:1px solid var(--line)}
.stat:last-child{border-right:0}
.stat strong{display:block;font-size:26px;font-weight:800;letter-spacing:-.02em;color:var(--ink);line-height:1.2}
.stat span{display:block;margin-top:4px;font-size:12.5px;color:var(--muted)}

/* ---------- section base ---------- */
.section{padding:88px 0}
.section-tight{padding:56px 0}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:32px;margin-bottom:40px}
.section-head h2{font-size:clamp(26px,3.2vw,40px);line-height:1.16;letter-spacing:-.02em;font-weight:800;max-width:720px}
.section-head p{margin-top:12px;font-size:15px;color:var(--muted);max-width:640px}
.link-more{
  flex-shrink:0;font-size:14px;font-weight:700;color:var(--brand);
  border-bottom:1px solid transparent;display:inline-flex;align-items:center;gap:6px;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.link-more:hover{border-bottom-color:var(--brand)}
.link-more .arrow{transition:transform .2s var(--ease)}
.link-more:hover .arrow{transform:translateX(3px)}

/* ---------- qa layout ---------- */
.qa-section{padding:72px 0 88px}
.qa-layout{display:grid;grid-template-columns:290px minmax(0,1fr);gap:52px;align-items:start}
.qa-index{
  position:sticky;top:104px;background:var(--paper);border:1px solid var(--line);
  border-radius:var(--r-md);padding:22px 22px 20px;
}
.index-title{font-size:13px;font-weight:800;letter-spacing:.14em;color:var(--muted);margin-bottom:14px}
.qa-index ul li a{
  display:flex;align-items:center;justify-content:space-between;gap:10px;
  padding:11px 0;font-size:14.5px;color:var(--ink-2);border-bottom:1px dashed var(--line);
  transition:color .2s var(--ease),transform .2s var(--ease);
}
.qa-index ul li:last-child a{border-bottom:0}
.qa-index ul li a i{font-style:normal;font-size:12px;color:var(--muted);font-family:ui-monospace,monospace}
.qa-index ul li a:hover{color:var(--brand);transform:translateX(3px)}
.index-note{
  margin-top:16px;padding-top:16px;border-top:1px solid var(--line);font-size:13px;color:var(--muted);
}
.index-note a{color:var(--brand);font-weight:700;border-bottom:1px solid var(--brand)}

.qa-group{margin-bottom:44px;scroll-margin-top:104px}
.qa-group:last-child{margin-bottom:0}
.qa-group > h2{
  display:flex;align-items:center;gap:12px;font-size:21px;font-weight:800;letter-spacing:-.01em;
  padding-bottom:14px;border-bottom:2px solid var(--ink);margin-bottom:6px;
}
.qa-group > h2 .num{
  font-family:ui-monospace,monospace;font-size:12px;font-weight:700;color:var(--brand);
  border:1px solid rgba(31,92,85,.3);border-radius:var(--r-xs);padding:2px 6px;letter-spacing:.06em;
}
.faq-item{border-bottom:1px solid var(--line)}
.faq-head{margin:0;font-size:inherit;font-weight:inherit}
.faq-q{
  position:relative;display:block;width:100%;text-align:left;padding:18px 44px 18px 0;
  background:none;border:0;cursor:pointer;font-size:17.5px;font-weight:600;line-height:1.6;color:var(--ink);
  transition:color .2s var(--ease);
}
.faq-q:hover{color:var(--brand)}
.faq-icon{position:absolute;right:2px;top:50%;width:16px;height:16px;transform:translateY(-50%)}
.faq-icon::before,.faq-icon::after{
  content:"";position:absolute;background:var(--ink);transition:transform .24s var(--ease),background .2s var(--ease);
}
.faq-icon::before{left:0;top:7px;width:16px;height:2px}
.faq-icon::after{left:7px;top:0;width:2px;height:16px}
.faq-item.is-open .faq-icon::after{transform:rotate(90deg)}
.faq-item.is-open .faq-q{color:var(--brand)}
.faq-a{display:grid;grid-template-rows:0fr;transition:grid-template-rows .26s var(--ease)}
.faq-a > .faq-a-inner{overflow:hidden}
.faq-item.is-open .faq-a{grid-template-rows:1fr}
.faq-a p{font-size:15px;line-height:1.85;color:var(--ink-2);padding:0 40px 20px 0;max-width:760px}
.qa-empty{
  border:1px dashed var(--line);border-radius:var(--r-md);padding:40px 24px;text-align:center;
  color:var(--muted);font-size:14.5px;background:var(--paper-2);
}
.qa-empty strong{display:block;color:var(--ink);font-size:16px;margin-bottom:6px}

/* ---------- topic cards ---------- */
.topics{background:var(--paper-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.topic-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.topic-card{
  display:flex;flex-direction:column;background:var(--paper);border:1px solid var(--line);
  border-radius:var(--r-md);overflow:hidden;
  transition:transform .22s var(--ease),border-color .22s var(--ease),box-shadow .22s var(--ease);
}
.topic-card:hover{transform:translateY(-2px);border-color:var(--brand);box-shadow:var(--shadow)}
.topic-card img{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:0;background:var(--paper-2);transition:transform .28s var(--ease)}
.topic-card:hover img{transform:scale(1.02)}
.topic-body{padding:20px 22px 22px;display:flex;flex-direction:column;gap:10px;flex:1}
.badge{
  display:inline-flex;align-items:center;height:24px;padding:0 9px;border:1px solid var(--line);
  border-radius:var(--r-xs);font-size:11.5px;font-weight:700;letter-spacing:.06em;color:var(--brand);
  background:rgba(31,92,85,.06);align-self:flex-start;
}
.topic-body h3{font-size:18.5px;font-weight:700;line-height:1.45;letter-spacing:-.01em}
.topic-body p{font-size:14px;line-height:1.8;color:var(--muted)}
.topic-link{
  margin-top:auto;padding-top:10px;font-size:13.5px;font-weight:700;color:var(--brand);
  display:inline-flex;align-items:center;gap:6px;
}
.topic-link .arrow{transition:transform .2s var(--ease)}
.topic-card:hover .topic-link .arrow{transform:translateX(3px)}

/* ---------- cta band ---------- */
.cta-band{
  background:var(--dark);color:var(--paper);position:relative;overflow:hidden;
  border-top:1px solid rgba(245,243,236,.12);
}
.cta-band::before{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.35;
  background-image:linear-gradient(rgba(245,243,236,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(245,243,236,.06) 1px,transparent 1px);
  background-size:56px 56px;
}
.cta-inner{position:relative;display:flex;align-items:center;justify-content:space-between;gap:48px;padding:80px 0}
.cta-inner h2{font-size:clamp(26px,3.2vw,38px);line-height:1.18;letter-spacing:-.02em;font-weight:800;max-width:620px}
.cta-inner p{margin-top:14px;font-size:15px;line-height:1.85;color:rgba(245,243,236,.72);max-width:600px}
.tag-signal{
  display:inline-flex;align-items:center;height:26px;padding:0 10px;border-radius:var(--r-xs);
  background:var(--signal);color:var(--ink);font-size:11.5px;font-weight:800;letter-spacing:.1em;
  margin-bottom:18px;
}
.cta-actions{display:flex;gap:12px;flex-shrink:0;flex-wrap:wrap}

/* ---------- footer ---------- */
.site-footer{background:var(--dark);color:rgba(245,243,236,.72);border-top:1px solid rgba(245,243,236,.12);padding:64px 0 0}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px;padding-bottom:48px}
.footer-logo{display:inline-flex;align-items:center;gap:10px;margin-bottom:16px}
.footer-logo .logo-mark{border-color:rgba(245,243,236,.45);color:var(--paper)}
.footer-logo .logo-text strong{color:var(--paper);font-size:15.5px;font-weight:800}
.footer-logo .logo-text em{color:rgba(245,243,236,.55)}
.footer-brand p{font-size:13.5px;line-height:1.85;max-width:340px}
.footer-col h4{font-size:13px;font-weight:800;letter-spacing:.12em;color:var(--paper);margin-bottom:16px}
.footer-col ul li{font-size:13.5px;padding:6px 0;color:rgba(245,243,236,.66)}
.footer-col ul li a{transition:color .2s var(--ease)}
.footer-col ul li a:hover{color:var(--signal)}
.footer-bottom{
  display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;
  padding:20px 0;border-top:1px solid rgba(245,243,236,.12);font-size:12.5px;color:rgba(245,243,236,.5);
}

/* ---------- reveal ---------- */
.js .reveal{opacity:0;transform:translateY(12px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
.js .reveal.in{opacity:1;transform:none}

/* ---------- responsive ---------- */
@media (max-width:1200px){
  .header-inner{gap:20px}
  .main-nav{gap:18px}
  .main-nav a{font-size:14px}
}
@media (max-width:992px){
  .hero-grid{grid-template-columns:1fr;gap:36px}
  .hero-figure{max-width:560px}
  .qa-layout{grid-template-columns:1fr;gap:32px}
  .qa-index{position:static}
  .qa-index ul{display:grid;grid-template-columns:1fr 1fr;gap:0 24px}
  .topic-grid{grid-template-columns:1fr 1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .cta-inner{flex-direction:column;align-items:flex-start;padding:64px 0}
  .section{padding:68px 0}
}
@media (max-width:900px){
  .main-nav{
    position:fixed;top:0;right:0;width:min(320px,84vw);height:100vh;
    background:var(--paper);border-left:1px solid var(--line);
    padding:92px 24px 32px;display:flex;flex-direction:column;gap:0;align-items:stretch;
    transform:translateX(102%);transition:transform .26s var(--ease);z-index:120;
    overflow-y:auto;box-shadow:-16px 0 40px rgba(17,21,20,.14);margin-left:0;
  }
  .main-nav a{padding:14px 0;border-bottom:1px solid var(--line);font-size:16px;font-weight:600}
  .main-nav a::after{display:none}
  .main-nav a.active{color:var(--brand)}
  .main-nav a.active::before{content:"●";font-size:8px;margin-right:8px;vertical-align:middle;color:var(--brand)}
  .main-nav.open{transform:translateX(0)}
  .nav-toggle{display:block}
  .header-actions .btn-text{display:none}
  body.nav-open::after{
    content:"";position:fixed;inset:0;background:rgba(14,18,17,.44);z-index:150;
  }
}
@media (max-width:768px){
  .header-inner{height:68px;gap:12px}
  .logo-mark{width:34px;height:34px}
  .logo-text strong{font-size:14px}
  .logo-text em{font-size:10px;letter-spacing:.18em}
  .page-hero{padding:28px 0 48px}
  .hero-lede{font-size:15.5px}
  .filter-pills{gap:6px}
  .pill{height:34px;padding:0 12px;font-size:13px}
  .stat-grid{grid-template-columns:1fr 1fr}
  .stat{padding:20px 16px 20px 0}
  .stat:nth-child(2){border-right:0}
  .stat:nth-child(1),.stat:nth-child(2){border-bottom:1px solid var(--line)}
  .stat strong{font-size:22px}
  .section-head{flex-direction:column;align-items:flex-start;gap:16px;margin-bottom:28px}
  .topic-grid{grid-template-columns:1fr}
  .qa-index ul{grid-template-columns:1fr}
  .faq-q{font-size:16px;padding:16px 40px 16px 0}
  .faq-a p{padding-right:0;font-size:14.5px}
  .qa-group > h2{font-size:18.5px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
  .footer-brand{grid-column:1 / -1}
  .footer-brand p{max-width:none}
  .cta-actions{width:100%}
  .cta-actions .btn{flex:1 1 auto}
}
@media (max-width:520px){
  .container{padding:0 16px}
  .btn-nav{padding:0 12px;font-size:13px;height:40px}
  .btn-nav .btn-label{display:none}
  .page-hero h1{font-size:clamp(30px,8vw,38px)}
  .stat-grid{grid-template-columns:1fr}
  .stat{border-right:0;border-bottom:1px solid var(--line);padding:16px 0}
  .stat:last-child{border-bottom:0}
  .search-bar input{height:50px;font-size:14.5px}
  .topic-body{padding:18px 16px 20px}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:6px}
  .cta-actions .btn{width:100%}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
  .js .reveal{opacity:1;transform:none}
}

/* roulang page: category6 */
:root{
  --ink:#111514;
  --ink-2:#2A312F;
  --paper:#F5F3EC;
  --paper-2:#EBE7DC;
  --line:#D8D3C7;
  --muted:#6E746F;
  --brand:#1F5C55;
  --brand-2:#2F7A70;
  --signal:#D9F24F;
  --danger:#B3402E;
  --success:#2F6F4E;
  --dark:#0E1211;
  --dark-text:#F5F3EC;
  --radius:8px;
  --radius-sm:4px;
  --shadow-float:0 12px 32px rgba(17,21,20,.08);
  --t:180ms cubic-bezier(.2,.7,.2,1);
  --f-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
  --f-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:var(--f-sans);
  font-size:16px;
  line-height:1.8;
  font-weight:400;
  color:var(--ink);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,p,ul,ol,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block;object-fit:cover}
button{font-family:inherit;font-size:inherit;cursor:pointer;border:0;background:none;color:inherit}
input,select,textarea{font-family:inherit;font-size:inherit;color:inherit}
svg{display:block}
:focus-visible{outline:2px solid var(--signal);outline-offset:2px;border-radius:2px}

.container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(245,243,236,.92);
  backdrop-filter:saturate(140%) blur(8px);
  border-bottom:1px solid var(--line);
}
.header-inner{
  min-height:76px;
  display:flex;align-items:center;gap:20px;
}
.logo{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.logo-mark{
  width:36px;height:36px;border-radius:var(--radius-sm);
  display:grid;place-items:center;
  background:var(--ink);color:var(--paper);
  transition:background var(--t),color var(--t);
}
.logo:hover .logo-mark{background:var(--brand);color:#fff}
.logo-text{display:flex;flex-direction:column;line-height:1.15}
.logo-text strong{font-size:16px;font-weight:800;letter-spacing:-.01em}
.logo-text em{font-style:normal;font-size:11px;letter-spacing:.18em;color:var(--muted);font-weight:600}
.main-nav{display:flex;align-items:center;gap:4px;margin-left:auto}
.main-nav a{
  position:relative;
  padding:8px 10px;border-radius:var(--radius-sm);
  font-size:14px;font-weight:600;color:var(--ink-2);
  transition:color var(--t),background var(--t);
}
.main-nav a:hover{color:var(--brand);background:var(--paper-2)}
.main-nav a.active{color:var(--ink)}
.main-nav a.active::after{
  content:"";position:absolute;left:10px;right:10px;bottom:2px;height:2px;
  background:var(--signal);border-radius:2px;
}
.header-actions{display:flex;align-items:center;gap:10px;flex:0 0 auto;margin-left:8px}
.btn-text{
  font-size:14px;font-weight:600;color:var(--ink-2);
  padding:6px 4px;border-bottom:1px solid transparent;
  transition:color var(--t),border-color var(--t);
}
.btn-text:hover{color:var(--brand);border-bottom-color:var(--brand)}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 22px;border-radius:var(--radius-sm);
  font-size:15px;font-weight:700;line-height:1.2;
  border:1px solid transparent;
  transition:background var(--t),color var(--t),border-color var(--t),transform var(--t),box-shadow var(--t);
}
.btn .arrow{transition:transform var(--t)}
.btn:hover .arrow{transform:translateX(3px)}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--ink);color:var(--signal);border-color:var(--ink)}
.btn-primary:hover{background:var(--signal);color:var(--ink);border-color:var(--signal)}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--ink);background:var(--paper-2)}
.btn-signal{background:var(--signal);color:var(--ink);border-color:var(--signal)}
.btn-signal:hover{background:transparent;color:var(--signal);border-color:var(--signal)}
.btn-sm{padding:10px 16px;font-size:14px}
.btn-nav{height:44px;padding:0 18px}
.btn-block{width:100%}
.btn[disabled],.btn.is-disabled{opacity:.45;cursor:not-allowed;transform:none}
.nav-toggle{
  display:none;width:44px;height:44px;border:1px solid var(--line);border-radius:var(--radius-sm);
  position:relative;background:transparent;
}
.nav-toggle span,.nav-toggle span::before,.nav-toggle span::after{
  position:absolute;left:50%;top:50%;width:18px;height:2px;background:var(--ink);border-radius:2px;
  transform:translate(-50%,-50%);transition:transform var(--t),opacity var(--t);
}
.nav-toggle span::before,.nav-toggle span::after{content:"";left:0;top:0;transform:translateY(-6px)}
.nav-toggle span::after{transform:translateY(6px)}
.nav-toggle[aria-expanded="true"] span{background:transparent}
.nav-toggle[aria-expanded="true"] span::before{transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] span::after{transform:rotate(-45deg)}

/* ---------- page hero ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding:22px 0 0;font-size:13px;color:var(--muted);
}
.breadcrumb a{color:var(--muted);transition:color var(--t)}
.breadcrumb a:hover{color:var(--brand)}
.breadcrumb .sep{color:var(--line)}
.breadcrumb .current{color:var(--ink-2);font-weight:600}

.page-hero{position:relative;margin-top:16px;overflow:hidden;border-radius:var(--radius);background:var(--dark)}
.page-hero::before{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(180deg,rgba(14,18,17,.86),rgba(14,18,17,.72)),url("/assets/images/backpic/back-2.webp");
  background-size:cover;background-position:center;
}
.page-hero-inner{position:relative;padding:64px 0 56px;display:grid;grid-template-columns:1.35fr .65fr;gap:40px;align-items:end}
.hero-tag{
  display:inline-flex;align-items:center;gap:8px;
  padding:5px 12px;border:1px solid rgba(217,242,79,.5);border-radius:999px;
  color:var(--signal);font-size:12px;font-weight:700;letter-spacing:.12em;
}
.page-hero h1{
  margin-top:18px;color:var(--dark-text);
  font-size:clamp(34px,4.6vw,58px);line-height:1.06;letter-spacing:-.02em;font-weight:800;
  max-width:16em;
}
.page-hero h1 .hl{color:var(--signal)}
.hero-lead{margin-top:18px;max-width:34em;color:rgba(245,243,236,.78);font-size:16px;line-height:1.85}
.hero-chips{display:flex;flex-wrap:wrap;gap:10px;margin-top:26px}
.hero-chips a{
  padding:8px 14px;border:1px solid rgba(245,243,236,.24);border-radius:999px;
  font-size:13px;font-weight:600;color:rgba(245,243,236,.9);
  transition:border-color var(--t),background var(--t),color var(--t);
}
.hero-chips a:hover{border-color:var(--signal);color:var(--signal);background:rgba(217,242,79,.08)}
.hero-side{
  border-left:1px solid rgba(245,243,236,.18);padding-left:28px;
  display:flex;flex-direction:column;gap:18px;
}
.hero-side .side-item{display:flex;flex-direction:column;gap:4px}
.hero-side .side-num{font-family:var(--f-mono);font-size:22px;color:var(--signal);font-weight:700;letter-spacing:-.02em}
.hero-side .side-label{font-size:13px;color:rgba(245,243,236,.7)}

/* ---------- sections ---------- */
.section{padding:88px 0}
.section.tight{padding:64px 0}
.section.paper2{background:var(--paper-2)}
.section-head{max-width:720px;margin-bottom:40px}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-size:12px;font-weight:700;letter-spacing:.2em;color:var(--brand);
}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--signal)}
h2.sec-title{
  margin-top:14px;
  font-size:clamp(28px,3.4vw,42px);line-height:1.16;letter-spacing:-.02em;font-weight:800;
}
.sec-desc{margin-top:14px;color:var(--muted);font-size:16px;line-height:1.85}

/* ---------- support layout ---------- */
.support-grid{display:grid;grid-template-columns:1.4fr .85fr;gap:32px;align-items:start}
.panel{
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:32px;
}
.panel-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;margin-bottom:6px}
.panel h3{font-size:22px;line-height:1.3;font-weight:800;letter-spacing:-.01em}
.panel .panel-note{margin-top:8px;color:var(--muted);font-size:14px}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin-top:26px}
.field{display:flex;flex-direction:column;gap:8px}
.field.full{grid-column:1 / -1}
.field label{font-size:13.5px;font-weight:700;color:var(--ink-2)}
.field label .req{color:var(--danger);margin-left:2px}
.field .hint{font-size:12.5px;color:var(--muted)}
.field input,.field select,.field textarea{
  width:100%;height:48px;padding:0 14px;
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-sm);
  font-size:15px;color:var(--ink);
  transition:border-color var(--t),box-shadow var(--t),background var(--t);
}
.field textarea{height:126px;padding:12px 14px;line-height:1.7;resize:vertical}
.field select{appearance:none;background-image:linear-gradient(45deg,transparent 50%,var(--ink-2) 50%),linear-gradient(135deg,var(--ink-2) 50%,transparent 50%);background-position:calc(100% - 20px) 21px,calc(100% - 14px) 21px;background-size:6px 6px,6px 6px;background-repeat:no-repeat}
.field input::placeholder,.field textarea::placeholder{color:#9AA09B}
.field input:focus,.field select:focus,.field textarea:focus{
  outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(31,92,85,.14);
}
.field.invalid input,.field.invalid select,.field.invalid textarea{border-color:var(--danger);background:#FDF6F4}
.field-error{display:none;font-size:12.5px;color:var(--danger);font-weight:600}
.field.invalid .field-error{display:block}
.check-row{display:flex;align-items:flex-start;gap:10px;margin-top:18px}
.check-row input{width:18px;height:18px;margin-top:4px;accent-color:var(--brand);flex:0 0 auto}
.check-row label{font-size:13.5px;color:var(--ink-2);line-height:1.7}
.check-row a{color:var(--brand);border-bottom:1px solid rgba(31,92,85,.35)}
.form-foot{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-top:24px;flex-wrap:wrap}
.form-foot .privacy-note{font-size:12.5px;color:var(--muted);max-width:22em}
.form-status{
  display:none;margin-top:18px;padding:12px 16px;border-radius:var(--radius-sm);
  font-size:14px;font-weight:600;
}
.form-status.ok{display:block;background:rgba(47,111,78,.1);color:var(--success);border:1px solid rgba(47,111,78,.35)}
.form-status.bad{display:block;background:rgba(179,64,46,.08);color:var(--danger);border:1px solid rgba(179,64,46,.35)}

.side-stack{display:flex;flex-direction:column;gap:20px;position:sticky;top:100px}
.info-card{
  border:1px solid var(--line);border-radius:var(--radius);background:var(--paper);
  padding:24px;transition:border-color var(--t),transform var(--t);
}
.info-card:hover{border-color:var(--brand);transform:translateY(-2px)}
.info-card h3{font-size:17px;font-weight:800;display:flex;align-items:center;gap:10px}
.info-card h3 .ic{
  width:30px;height:30px;border-radius:50%;display:grid;place-items:center;
  background:var(--paper-2);color:var(--brand);flex:0 0 auto;
}
.hours{display:flex;flex-direction:column;margin-top:16px}
.hours li{
  display:flex;justify-content:space-between;gap:12px;
  padding:10px 0;border-bottom:1px dashed var(--line);font-size:14px;color:var(--ink-2);
}
.hours li:last-child{border-bottom:0}
.hours li span:last-child{font-family:var(--f-mono);font-size:13px;color:var(--brand);font-weight:700}
.flow{margin-top:16px;display:flex;flex-direction:column;gap:14px}
.flow li{display:flex;gap:12px;font-size:14px;color:var(--ink-2);line-height:1.7}
.flow .num{
  font-family:var(--f-mono);font-size:12px;font-weight:700;color:var(--brand);
  border:1px solid var(--line);border-radius:var(--radius-sm);
  width:26px;height:26px;display:grid;place-items:center;flex:0 0 auto;background:var(--paper-2);
}
.contact-list{display:flex;flex-direction:column;gap:14px;margin-top:16px;font-size:14px}
.contact-list li{display:flex;gap:10px;align-items:flex-start;color:var(--ink-2)}
.contact-list .k{color:var(--muted);min-width:5em;font-size:13px}
.contact-list .v{font-weight:600}

/* ---------- scenarios ---------- */
.scene-wrap{display:grid;grid-template-columns:.9fr 1.1fr;gap:40px;align-items:center}
.scene-media{position:relative;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line)}
.scene-media img{width:100%;aspect-ratio:4/3;object-position:center}
.scene-media figcaption{
  position:absolute;left:0;right:0;bottom:0;padding:14px 18px;
  background:linear-gradient(180deg,rgba(14,18,17,0),rgba(14,18,17,.82));
  color:rgba(245,243,236,.92);font-size:13px;
}
.scene-list{display:flex;flex-direction:column}
.scene-item{
  display:grid;grid-template-columns:64px 1fr auto;gap:18px;align-items:start;
  padding:22px 0;border-top:1px solid var(--line);
  transition:background var(--t);
}
.scene-item:last-child{border-bottom:1px solid var(--line)}
.scene-item:hover{background:rgba(235,231,220,.55)}
.scene-item .idx{font-family:var(--f-mono);font-size:13px;font-weight:700;color:var(--brand);padding-top:4px}
.scene-item h3{font-size:17.5px;font-weight:800;letter-spacing:-.01em}
.scene-item p{margin-top:6px;font-size:14px;color:var(--muted);line-height:1.75;max-width:34em}
.scene-item .tag{
  align-self:start;white-space:nowrap;
  font-size:12px;font-weight:700;color:var(--ink-2);
  border:1px solid var(--line);border-radius:999px;padding:4px 12px;background:var(--paper);
}

/* ---------- dark cta ---------- */
.dark-cta{background:var(--dark);color:var(--dark-text);position:relative;overflow:hidden}
.dark-cta::before{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(245,243,236,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(245,243,236,.06) 1px,transparent 1px);
  background-size:48px 48px;
  opacity:.5;pointer-events:none;
}
.dark-cta .container{position:relative}
.cta-grid{display:grid;grid-template-columns:1.3fr .7fr;gap:36px;align-items:center;padding:64px 0}
.dark-cta h2{font-size:clamp(26px,3.2vw,38px);line-height:1.2;letter-spacing:-.02em;font-weight:800}
.dark-cta p{margin-top:14px;color:rgba(245,243,236,.72);font-size:15px;line-height:1.85;max-width:36em}
.cta-actions{display:flex;flex-direction:column;gap:12px;align-items:stretch}
.cta-note{font-size:12.5px;color:rgba(245,243,236,.55);text-align:center}

/* ---------- faq ---------- */
.faq-list{border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding:22px 4px;text-align:left;
  font-size:18px;font-weight:700;line-height:1.5;color:var(--ink);
  transition:color var(--t);
}
.faq-q:hover{color:var(--brand)}
.faq-q .pm{
  position:relative;flex:0 0 auto;width:26px;height:26px;border-radius:50%;
  border:1px solid var(--line);transition:transform var(--t),background var(--t),border-color var(--t);
}
.faq-q .pm::before,.faq-q .pm::after{
  content:"";position:absolute;left:50%;top:50%;width:11px;height:1.6px;background:var(--ink-2);
  transform:translate(-50%,-50%);transition:background var(--t);
}
.faq-q .pm::after{transform:translate(-50%,-50%) rotate(90deg)}
.faq-q[aria-expanded="true"] .pm{transform:rotate(45deg);background:var(--signal);border-color:var(--signal)}
.faq-a{max-height:0;overflow:hidden;transition:max-height 240ms cubic-bezier(.2,.7,.2,1)}
.faq-a p{padding:0 4px 24px;max-width:52em;font-size:15px;line-height:1.85;color:var(--ink-2)}
.faq-a p a{color:var(--brand);border-bottom:1px solid rgba(31,92,85,.35)}

/* ---------- fade in ---------- */
.fade-up{opacity:0;transform:translateY(12px);transition:opacity 500ms cubic-bezier(.2,.7,.2,1),transform 500ms cubic-bezier(.2,.7,.2,1)}
.fade-up.in{opacity:1;transform:none}

/* ---------- footer ---------- */
.site-footer{background:var(--dark);color:var(--dark-text);border-top:1px solid rgba(245,243,236,.12);padding:64px 0 28px}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:36px}
.footer-logo{display:flex;align-items:center;gap:10px}
.footer-logo .logo-mark{background:rgba(245,243,236,.1);color:var(--signal)}
.footer-logo .logo-text strong{color:var(--dark-text)}
.footer-logo .logo-text em{color:rgba(245,243,236,.55)}
.footer-brand p{margin-top:16px;font-size:14px;line-height:1.85;color:rgba(245,243,236,.62);max-width:30em}
.footer-col h4{font-size:13px;letter-spacing:.14em;color:rgba(245,243,236,.5);font-weight:700;margin-bottom:16px}
.footer-col ul{display:flex;flex-direction:column;gap:10px}
.footer-col li{font-size:14px;color:rgba(245,243,236,.7)}
.footer-col a{font-size:14px;color:rgba(245,243,236,.72);border-bottom:1px solid transparent;transition:color var(--t),border-color var(--t)}
.footer-col a:hover{color:var(--signal);border-bottom-color:var(--signal)}
.footer-bottom{
  margin-top:44px;padding-top:22px;border-top:1px solid rgba(245,243,236,.12);
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:12.5px;color:rgba(245,243,236,.45);
}

/* ---------- responsive ---------- */
@media (max-width:1200px){
  .container{padding:0 20px}
  .main-nav a{padding:8px 8px;font-size:13.5px}
  .header-actions{margin-left:4px}
}
@media (max-width:1024px){
  .nav-toggle{display:block}
  .main-nav{
    position:fixed;top:0;right:0;bottom:0;width:min(320px,86vw);
    background:var(--paper);border-left:1px solid var(--line);
    flex-direction:column;align-items:stretch;gap:0;
    padding:96px 22px 24px;margin:0;
    transform:translateX(100%);transition:transform 240ms cubic-bezier(.2,.7,.2,1);
    box-shadow:var(--shadow-float);z-index:70;overflow-y:auto;
  }
  .main-nav.open{transform:translateX(0)}
  .main-nav a{
    padding:14px 6px;font-size:15px;border-bottom:1px solid var(--line);
    border-radius:0;display:flex;align-items:center;justify-content:space-between;
  }
  .main-nav a::before{
    content:"";width:5px;height:5px;border-radius:50%;background:var(--line);margin-right:10px;flex:0 0 auto;
  }
  .main-nav a.active::before{background:var(--signal)}
  .main-nav a.active::after{display:none}
  .header-actions .btn-text{display:none}
  .header-inner{justify-content:space-between}
  .main-nav{margin-left:0}
  .page-hero-inner{grid-template-columns:1fr;gap:28px;padding:52px 0 44px}
  .hero-side{border-left:0;border-top:1px solid rgba(245,243,236,.18);padding-left:0;padding-top:22px;flex-direction:row;gap:32px;flex-wrap:wrap}
  .support-grid{grid-template-columns:1fr;gap:26px}
  .side-stack{position:static}
  .scene-wrap{grid-template-columns:1fr;gap:28px}
  .cta-grid{grid-template-columns:1fr;gap:26px;padding:52px 0}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
}
@media (max-width:768px){
  .section{padding:60px 0}
  .section.tight{padding:48px 0}
  .panel{padding:24px 20px}
  .form-grid{grid-template-columns:1fr;gap:16px}
  .form-foot{flex-direction:column;align-items:stretch}
  .form-foot .btn{width:100%}
  .scene-item{grid-template-columns:44px 1fr;gap:14px}
  .scene-item .tag{grid-column:2;justify-self:start;margin-top:4px}
  .faq-q{font-size:16.5px;padding:18px 2px;gap:14px}
  .page-hero h1{font-size:clamp(30px,7vw,40px)}
  .footer-bottom{flex-direction:column;gap:8px}
}
@media (max-width:520px){
  .container{padding:0 16px}
  .logo-text strong{font-size:15px}
  .btn-nav{height:42px;padding:0 14px;font-size:13.5px}
  .header-actions{gap:8px}
  .hero-chips{gap:8px}
  .hero-chips a{font-size:12.5px;padding:7px 12px}
  .cta-actions .btn{width:100%}
  .footer-grid{grid-template-columns:1fr 1fr;gap:26px}
  .footer-brand{grid-column:1 / -1}
  .hours li{font-size:13.5px}
}
@media (prefers-reduced-motion:reduce){
  *{transition-duration:.01ms !important;animation-duration:.01ms !important}
  .fade-up{opacity:1;transform:none}
}