/* roulang page: index */
:root{
  --brand:#0F3D3E; --brand-dark:#0A2C2D; --brand-light:#1C5C5A;
  --accent:#C75B33; --accent-soft:#F2D8CB;
  --bg:#F6F3EE; --surface:#FFFFFF; --dark:#101413;
  --text:#151A19; --text2:#5A635F; --text3:#8A918D;
  --border:#E2DCD2; --ph:#E9E5DE;
  --r-card:10px; --r-btn:6px; --r-input:8px; --r-pill:999px; --r-icon:12px;
  --sh-1:0 1px 2px rgba(16,20,19,.05);
  --sh-2:0 12px 32px -12px rgba(16,20,19,.18);
  --ease:cubic-bezier(.22,.61,.36,1);
  --serif:"Noto Serif SC",Georgia,"Songti SC",serif;
  --sans:"Noto Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --bs-primary:#0F3D3E; --bs-primary-rgb:15,61,62;
  --bs-body-font-family:var(--sans);
  --bs-body-color:#151A19;
  --bs-body-bg:#F6F3EE;
  --bs-border-radius:10px;
  --bs-border-color:#E2DCD2;
  --bs-link-color:#0F3D3E;
  --bs-link-hover-color:#C75B33;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:var(--sans);font-size:17px;line-height:1.9;
  font-weight:400;letter-spacing:0;overflow-x:hidden;
}
img{max-width:100%;display:block;}
a{color:var(--brand);text-decoration:none;transition:color .18s var(--ease);}
a:hover{color:var(--accent);}
button,input{font-family:inherit;font-size:inherit;}
h1,h2,h3,h4{font-family:var(--serif);font-weight:700;color:var(--text);margin:0;letter-spacing:-.01em;}
p{margin:0 0 18px;color:var(--text2);}
p:last-child{margin-bottom:0;}
ul{margin:0;padding:0;list-style:none;}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:3px;}

.container-x{width:100%;max-width:1200px;margin:0 auto;padding:0 24px;}
@media (min-width:1400px){.container-x{max-width:1280px;}}
.section{padding:96px 0;}
.section-sm{padding:72px 0;}
.bg-surface{background:var(--surface);}
.bg-deep{background:var(--dark);color:#E7E4DE;}
.bg-deep h2,.bg-deep h3{color:#fff;}
.bg-deep p{color:#A9B0AC;}

/* ---------- 顶部信息条 ---------- */
.topbar{background:var(--brand);color:#fff;font-size:13px;line-height:1;height:40px;display:flex;align-items:center;}
.topbar-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;width:100%;}
.topbar-domain{font-family:var(--sans);letter-spacing:.06em;color:rgba(255,255,255,.78);}
.topbar-note{color:rgba(255,255,255,.86);}
.topbar-cta{color:#fff;border-bottom:1px solid rgba(255,255,255,.45);padding-bottom:2px;white-space:nowrap;}
.topbar-cta:hover{color:var(--accent-soft);border-color:var(--accent-soft);}
@media (max-width:767px){.topbar-note{display:none;} .topbar-domain{font-size:12px;}}

/* ---------- 主导航 ---------- */
.site-header{position:sticky;top:0;z-index:1030;background:rgba(255,255,255,.96);backdrop-filter:saturate(140%) blur(6px);transition:box-shadow .32s var(--ease),border-color .32s var(--ease);border-bottom:1px solid transparent;}
.site-header.is-scrolled{border-bottom:1px solid var(--border);box-shadow:0 6px 24px -18px rgba(16,20,19,.35);}
.nav-inner{height:72px;display:flex;align-items:center;justify-content:space-between;gap:24px;}
.brand{display:flex;align-items:center;gap:10px;color:var(--text);}
.brand:hover{color:var(--brand);}
.brand-mark{width:34px;height:34px;border-radius:8px;background:var(--brand);color:#fff;display:flex;align-items:center;justify-content:center;font-family:var(--serif);font-size:15px;font-weight:700;letter-spacing:.02em;flex:none;}
.brand-text{display:flex;flex-direction:column;line-height:1.15;}
.brand-name{font-family:var(--serif);font-size:19px;font-weight:700;letter-spacing:-.01em;}
.brand-sub{font-size:11px;color:var(--text3);letter-spacing:.14em;text-transform:uppercase;}
.main-nav{display:flex;align-items:center;gap:4px;}
.main-nav a{position:relative;display:inline-block;padding:10px 14px;font-size:15px;color:var(--text2);font-weight:500;border-radius:var(--r-btn);}
.main-nav a::after{content:"";position:absolute;left:14px;right:14px;bottom:4px;height:2px;background:var(--accent);transform:scaleX(0);transform-origin:left;transition:transform .32s var(--ease);}
.main-nav a:hover{color:var(--brand);}
.main-nav a:hover::after{transform:scaleX(1);}
.main-nav a.is-active{color:var(--text);font-weight:700;}
.main-nav a.is-active::after{transform:scaleX(1);}
.nav-right{display:flex;align-items:center;gap:12px;}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:none;border-radius:var(--r-btn);font-size:15px;font-weight:500;padding:11px 22px;line-height:1.4;transition:transform .18s var(--ease),background .18s var(--ease),color .18s var(--ease),box-shadow .32s var(--ease),border-color .18s var(--ease);}
.btn-primary-x{background:var(--brand);color:#fff;}
.btn-primary-x:hover{background:var(--brand-dark);color:#fff;transform:translateY(-1px);box-shadow:var(--sh-2);}
.btn-primary-x:active{transform:translateY(0);}
.btn-ghost-x{background:var(--surface);color:var(--brand);border:1px solid var(--border);}
.btn-ghost-x:hover{color:var(--brand);border-color:var(--brand);transform:translateY(-1px);}
.btn-light-x{background:#fff;color:var(--brand-dark);}
.btn-light-x:hover{background:var(--accent-soft);color:var(--brand-dark);transform:translateY(-1px);}
.btn-sm-x{padding:9px 16px;font-size:14px;}
.nav-search{width:38px;height:38px;border-radius:var(--r-btn);display:flex;align-items:center;justify-content:center;color:var(--text2);border:1px solid var(--border);background:#fff;}
.nav-search:hover{color:var(--brand);border-color:var(--brand);}
.nav-toggle{display:none;width:44px;height:44px;border-radius:var(--r-btn);border:1px solid var(--border);background:#fff;align-items:center;justify-content:center;font-size:17px;color:var(--text);}
.drawer{position:fixed;top:0;right:0;height:100%;width:min(88vw,360px);background:#fff;z-index:1060;transform:translateX(102%);transition:transform .32s var(--ease);padding:24px;overflow-y:auto;box-shadow:-18px 0 48px -24px rgba(16,20,19,.45);}
.drawer.is-open{transform:translateX(0);}
.drawer-mask{position:fixed;inset:0;background:rgba(16,20,19,.45);opacity:0;visibility:hidden;transition:opacity .32s var(--ease);z-index:1050;}
.drawer-mask.is-open{opacity:1;visibility:visible;}
.drawer-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:22px;padding-bottom:16px;border-bottom:1px solid var(--border);}
.drawer-close{width:40px;height:40px;border-radius:var(--r-btn);border:1px solid var(--border);background:#fff;color:var(--text);}
.drawer-nav a{display:block;padding:14px 4px;border-bottom:1px solid var(--border);color:var(--text);font-size:16px;font-weight:500;}
.drawer-nav a.is-active{color:var(--accent);font-weight:700;}
.drawer-note{margin-top:22px;font-size:13px;color:var(--text3);line-height:1.8;}

@media (max-width:991px){
  .main-nav{display:none;}
  .nav-toggle{display:inline-flex;}
  .nav-right .btn-primary-x{display:none;}
}

/* ---------- Hero ---------- */
.hero{padding:76px 0 84px;position:relative;}
.hero::before{content:"";position:absolute;inset:0;background:
  linear-gradient(180deg,rgba(246,243,238,0) 0%,rgba(246,243,238,1) 100%);pointer-events:none;}
.hero-grid{position:relative;display:grid;grid-template-columns:1.05fr .95fr;gap:64px;align-items:center;min-height:calc(88vh - 112px);}
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-size:13px;letter-spacing:.16em;color:var(--accent);text-transform:uppercase;margin-bottom:20px;}
.eyebrow::before{content:"";width:34px;height:1px;background:var(--accent);display:block;}
.hero h1{font-size:clamp(34px,5vw,60px);line-height:1.12;letter-spacing:-.02em;margin-bottom:20px;}
.hero-sub{font-size:18px;line-height:1.85;color:var(--text2);max-width:560px;margin-bottom:32px;}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:44px;}
.hero-figures{display:flex;flex-wrap:wrap;gap:40px;padding-top:28px;border-top:1px solid var(--border);}
.hero-fig span{display:block;font-family:var(--serif);font-size:28px;font-weight:700;color:var(--brand);line-height:1.2;}
.hero-fig small{font-size:13px;color:var(--text3);letter-spacing:.02em;}
.hero-media{position:relative;}
.hero-media img{width:100%;aspect-ratio:4/5;object-fit:cover;border-radius:var(--r-card);border:1px solid var(--border);box-shadow:var(--sh-2);}
.hero-tag{position:absolute;left:-18px;bottom:32px;background:#fff;border:1px solid var(--border);border-radius:var(--r-card);padding:16px 20px;box-shadow:var(--sh-1);max-width:250px;}
.hero-tag strong{display:block;font-family:var(--serif);font-size:15px;color:var(--brand);}
.hero-tag span{font-size:13px;color:var(--text3);line-height:1.7;}
.hero-ticks{position:absolute;top:26px;left:-14px;display:flex;flex-direction:column;gap:8px;}
.hero-ticks i{display:block;width:18px;height:1px;background:var(--accent);}
.hero-ticks i:nth-child(2){width:30px;}
.hero-ticks i:nth-child(3){width:12px;}

@media (max-width:991px){
  .hero-grid{grid-template-columns:1fr;gap:44px;min-height:0;}
  .hero-media img{aspect-ratio:16/10;}
  .hero-tag{left:auto;right:16px;bottom:16px;}
  .hero-ticks{display:none;}
}

/* ---------- 章节标题组件 ---------- */
.sec-head{display:grid;grid-template-columns:1fr auto;align-items:end;gap:24px;margin-bottom:52px;}
.sec-num{font-family:var(--sans);font-size:13px;letter-spacing:.22em;color:var(--accent);margin-bottom:12px;display:block;}
.sec-head h2{font-size:clamp(26px,3vw,40px);line-height:1.2;position:relative;padding-left:20px;}
.sec-head h2::before{content:"";position:absolute;left:0;top:.18em;bottom:.18em;width:3px;background:var(--accent);transform:scaleY(0);transform-origin:top;transition:transform .6s var(--ease);}
.sec-head.is-in h2::before{transform:scaleY(1);}
.sec-head p{margin:12px 0 0;font-size:15px;color:var(--text3);max-width:640px;}
.sec-link{font-size:14px;font-weight:500;color:var(--brand);border-bottom:1px solid var(--border);padding-bottom:3px;white-space:nowrap;}
.sec-link:hover{border-color:var(--accent);}
@media (max-width:767px){.sec-head{grid-template-columns:1fr;align-items:start;gap:16px;margin-bottom:36px;}}

/* ---------- S2 主张 ---------- */
.claim-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:64px;}
.claim-grid h2{font-size:clamp(26px,3.2vw,42px);line-height:1.24;}
.claim-list{display:grid;gap:36px;}
.claim-block{padding-left:22px;border-left:1px solid var(--border);}
.claim-block:nth-child(2){margin-left:56px;}
.claim-block .no{font-size:13px;letter-spacing:.2em;color:var(--accent);display:block;margin-bottom:8px;}
.claim-block h3{font-size:21px;margin-bottom:10px;}
.claim-block p{font-size:16px;line-height:1.85;max-width:520px;}
@media (max-width:991px){.claim-grid{grid-template-columns:1fr;gap:40px;} .claim-block:nth-child(2){margin-left:0;}}

/* ---------- S3 时间轴 ---------- */
.timeline{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border-top:1px solid var(--border);}
.tl-item{padding:32px 24px 8px;border-right:1px solid var(--border);position:relative;}
.tl-item:last-child{border-right:none;}
.tl-item::before{content:"";position:absolute;top:-1px;left:0;width:42px;height:2px;background:var(--accent);}
.tl-no{font-family:var(--sans);font-size:13px;letter-spacing:.2em;color:var(--accent);display:block;margin-bottom:14px;}
.tl-item h3{font-size:19px;margin-bottom:10px;}
.tl-item p{font-size:15px;line-height:1.8;}
@media (max-width:991px){
  .timeline{grid-template-columns:1fr 1fr;}
  .tl-item:nth-child(2){border-right:none;}
  .tl-item:nth-child(1),.tl-item:nth-child(2){border-bottom:1px solid var(--border);}
}
@media (max-width:575px){
  .timeline{grid-template-columns:1fr;}
  .tl-item{border-right:none;border-bottom:1px solid var(--border);}
  .tl-item:last-child{border-bottom:none;}
}

/* ---------- S4 精选卡 ---------- */
.feature-grid{display:grid;grid-template-columns:1.35fr 1fr;gap:28px;align-items:start;}
.feature-side{display:grid;gap:28px;}
.card-x{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-card);overflow:hidden;transition:transform .32s var(--ease),box-shadow .32s var(--ease);height:100%;display:flex;flex-direction:column;}
.card-x:hover{transform:translateY(-2px);box-shadow:var(--sh-2);}
.card-media{position:relative;overflow:hidden;background:var(--ph);}
.card-media img{width:100%;object-fit:cover;transition:transform .6s var(--ease);}
.card-x:hover .card-media img{transform:scale(1.03);}
.card-media::after{content:"";position:absolute;inset:0;background:rgba(16,20,19,0);transition:background .32s var(--ease);}
.card-x:hover .card-media::after{background:rgba(16,20,19,.08);}
.card-media.is-wide img{aspect-ratio:16/9;}
.card-media.is-tall img{aspect-ratio:4/3;}
.card-media.is-small img{aspect-ratio:16/10;}
.card-body{padding:24px;display:flex;flex-direction:column;flex:1;}
.card-tag{position:absolute;top:12px;left:12px;background:var(--accent-soft);color:var(--brand-dark);font-size:12px;font-weight:500;padding:5px 12px;border-radius:var(--r-pill);z-index:2;}
.card-x h3{font-size:20px;line-height:1.4;margin-bottom:10px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.card-x p{font-size:15px;line-height:1.8;color:var(--text2);display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;margin-bottom:16px;}
.card-foot{margin-top:auto;padding-top:14px;border-top:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;font-size:13px;color:var(--text3);}
.card-foot .go{color:var(--brand);transition:transform .32s var(--ease);}
.card-x:hover .card-foot .go{transform:translateX(4px);}
.card-x.is-hero h3{font-size:24px;}
@media (max-width:991px){.feature-grid{grid-template-columns:1fr;}.card-media.is-tall img{aspect-ratio:16/9;}}

/* ---------- S5 资讯列表 ---------- */
.news-list{border-top:1px solid var(--border);}
.news-item{display:grid;grid-template-columns:64px 96px 1fr auto;gap:24px;align-items:center;padding:22px 0;border-bottom:1px solid var(--border);transition:background .32s var(--ease);}
.news-item:hover{background:rgba(15,61,62,.03);}
.news-idx{font-family:var(--serif);font-size:15px;color:var(--text3);letter-spacing:.04em;}
.news-thumb{width:96px;height:64px;border-radius:8px;overflow:hidden;border:1px solid var(--border);background:var(--ph);}
.news-thumb img{width:100%;height:100%;object-fit:cover;}
.news-main h3{font-size:18px;line-height:1.45;margin-bottom:6px;display:-webkit-box;-webkit-line-clamp:1;-webkit-box-orient:vertical;overflow:hidden;}
.news-main p{font-size:14px;color:var(--text2);line-height:1.7;margin:0;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.news-meta{display:flex;align-items:center;gap:16px;font-size:13px;color:var(--text3);white-space:nowrap;}
.news-meta .pill{background:var(--accent-soft);color:var(--brand-dark);border-radius:var(--r-pill);padding:3px 11px;font-size:12px;}
.news-empty{background:var(--surface);border:1px solid var(--border);border-radius:var(--r-card);padding:48px 24px;text-align:center;}
.news-empty i{font-size:26px;color:var(--brand);opacity:.55;}
.news-empty p{margin:14px 0 18px;font-size:15px;color:var(--text3);}
@media (max-width:991px){
  .news-item{grid-template-columns:1fr;gap:12px;}
  .news-idx{display:none;}
  .news-thumb{width:100%;height:180px;}
  .news-meta{gap:12px;}
}

/* ---------- S6 数据与证言 ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border-top:1px solid rgba(255,255,255,.14);border-bottom:1px solid rgba(255,255,255,.14);}
.stat{padding:34px 24px;border-right:1px solid rgba(255,255,255,.14);}
.stat:last-child{border-right:none;}
.stat b{display:block;font-family:var(--serif);font-size:38px;font-weight:700;color:#fff;line-height:1.1;margin-bottom:8px;}
.stat span{font-size:14px;color:#9AA6A2;}
.quotes{display:flex;gap:24px;overflow-x:auto;padding:36px 0 8px;scroll-snap-type:x mandatory;}
.quote{min-width:320px;flex:1 0 320px;scroll-snap-align:start;background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.14);border-radius:var(--r-card);padding:24px;}
.quote p{font-size:15px;line-height:1.85;color:#D3D8D5;margin-bottom:16px;}
.quote span{font-size:13px;color:var(--accent-soft);}
@media (max-width:991px){.stats{grid-template-columns:1fr 1fr;}.stat{border-bottom:1px solid rgba(255,255,255,.14);}.stat:nth-child(2){border-right:none;}.stat:nth-child(3),.stat:nth-child(4){border-bottom:none;}}
@media (max-width:575px){.stats{grid-template-columns:1fr;}.stat{border-right:none;border-bottom:1px solid rgba(255,255,255,.14);}.stat:last-child{border-bottom:none;}}

/* ---------- FAQ ---------- */
.faq-wrap{max-width:880px;margin:0 auto;border-top:1px solid var(--border);}
.faq-item{border-bottom:1px solid var(--border);}
.faq-item summary{list-style:none;cursor:pointer;padding:24px 44px 24px 0;position:relative;font-family:var(--serif);font-size:19px;font-weight:600;color:var(--text);transition:color .18s var(--ease);}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary:hover{color:var(--brand-light);}
.faq-item summary::before{content:"";position:absolute;left:-16px;top:22px;bottom:22px;width:3px;background:var(--accent);transform:scaleY(0);transform-origin:top;transition:transform .32s var(--ease);}
.faq-item[open] summary::before{transform:scaleY(1);}
.faq-item summary::after{content:"";position:absolute;right:8px;top:50%;width:12px;height:1.5px;background:var(--text3);transform:translateY(-50%);transition:background .18s var(--ease);}
.faq-item summary .plus{position:absolute;right:8px;top:50%;width:1.5px;height:12px;background:var(--text3);transform:translateY(-50%);transition:transform .32s var(--ease),background .18s var(--ease);}
.faq-item[open] summary::after{background:var(--accent);}
.faq-item[open] summary .plus{transform:translateY(-50%) rotate(90deg);background:var(--accent);}
.faq-body{padding:0 44px 26px 0;font-size:16px;line-height:1.9;color:var(--text2);}

/* ---------- CTA ---------- */
.cta-band{background:var(--dark);border-radius:var(--r-card);padding:56px;display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center;border:1px solid rgba(255,255,255,.08);}
.cta-band h2{font-size:clamp(24px,2.8vw,34px);line-height:1.25;margin-bottom:14px;}
.cta-band p{font-size:16px;line-height:1.85;color:#A9B0AC;margin:0;}
.subscribe{display:flex;gap:10px;background:#fff;padding:8px;border-radius:var(--r-card);}
.subscribe input{flex:1;border:1px solid var(--border);border-radius:var(--r-input);padding:12px 16px;font-size:15px;color:var(--text);background:#fff;}
.subscribe input::placeholder{color:var(--text3);}
.subscribe input:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 2px var(--accent-soft);}
.form-hint{font-size:13px;color:#8B948F;margin-top:12px;}
@media (max-width:991px){.cta-band{grid-template-columns:1fr;padding:36px;gap:28px;}}
@media (max-width:575px){.subscribe{flex-direction:column;background:transparent;padding:0;gap:12px;}.subscribe .btn{width:100%;}}

/* ---------- Footer ---------- */
.footer{background:var(--dark);color:#98A19C;padding:72px 0 0;font-size:14px;}
.footer h4{color:#fff;font-size:15px;font-family:var(--sans);font-weight:700;letter-spacing:.06em;margin-bottom:20px;}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:44px;padding-bottom:52px;border-bottom:1px solid rgba(255,255,255,.1);}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:18px;}
.footer-brand .brand-mark{background:var(--accent);}
.footer-brand span{font-family:var(--serif);font-size:18px;color:#fff;font-weight:700;}
.footer p{color:#98A19C;font-size:14px;line-height:1.9;}
.footer-links a{display:block;color:#98A19C;padding:7px 0;transition:color .18s var(--ease),transform .18s var(--ease);}
.footer-links a:hover{color:var(--accent-soft);transform:translateX(2px);}
.footer-info li{display:flex;justify-content:space-between;gap:12px;padding:7px 0;border-bottom:1px dashed rgba(255,255,255,.08);}
.footer-info li span:last-child{color:#D5DAD7;}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:24px 0;font-size:13px;color:#7C8681;flex-wrap:wrap;}
.footer-bottom a{color:#7C8681;}
.footer-bottom a:hover{color:var(--accent-soft);}
@media (max-width:991px){.footer-grid{grid-template-columns:1fr 1fr;gap:32px;}}
@media (max-width:575px){.footer-grid{grid-template-columns:1fr;}}

/* ---------- 返回顶部 ---------- */
.to-top{position:fixed;right:24px;bottom:24px;width:44px;height:44px;border-radius:var(--r-btn);background:var(--brand);color:#fff;border:none;display:flex;align-items:center;justify-content:center;opacity:0;visibility:hidden;transform:translateY(8px);transition:opacity .32s var(--ease),transform .32s var(--ease),visibility .32s;z-index:1020;box-shadow:var(--sh-2);}
.to-top.is-show{opacity:1;visibility:visible;transform:translateY(0);}
.to-top:hover{background:var(--brand-dark);}

/* ---------- 入场动效 ---------- */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .6s var(--ease),transform .6s var(--ease);}
.reveal.is-in{opacity:1;transform:none;}
@media (prefers-reduced-motion:reduce){
  *{animation:none !important;transition:none !important;}
  .reveal{opacity:1;transform:none;}
}
@media (max-width:767px){
  .section{padding:48px 0;}
  .hero{padding:48px 0 56px;}
  .container-x{padding:0 16px;}
  body{font-size:16px;}
}

/* roulang page: article */
:root{
  --ink:#0F3D3E;
  --ink-dark:#0A2C2D;
  --ink-light:#1C5C5A;
  --accent:#C75B33;
  --accent-soft:#F2D8CB;
  --bg:#F6F3EE;
  --surface:#FFFFFF;
  --dark:#101413;
  --text:#151A19;
  --text-2:#5A635F;
  --text-3:#8A918D;
  --line:#E2DCD2;
  --ph:#E9E5DE;
  --r-card:10px;
  --r-btn:6px;
  --r-input:8px;
  --r-pill:999px;
  --sh-1:0 1px 2px rgba(16,20,19,.05);
  --sh-2:0 12px 32px -12px rgba(16,20,19,.18);
  --ease:cubic-bezier(.22,.61,.36,1);
  --bs-primary:#0F3D3E;
  --bs-body-font-family:"Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --bs-border-radius:6px;
  --bs-link-color:#0F3D3E;
  --bs-link-hover-color:#C75B33;
  --bs-body-color:#151A19;
  --bs-border-color:#E2DCD2;
  --bs-font-sans-serif:"Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:"Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:17px;line-height:1.9;-webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit}
h1,h2,h3,h4{font-family:"Noto Serif SC",Georgia,serif;font-weight:600;margin:0;color:var(--text);letter-spacing:-.01em}
p{margin:0}
::selection{background:var(--accent-soft);color:var(--ink-dark)}
.container-x{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}
@media (min-width:1400px){.container-x{max-width:1280px}}
@media (max-width:575.98px){.container-x{padding:0 16px}}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* ---------- 顶部信息条 ---------- */
.topbar{background:var(--ink);color:#fff;font-size:13px}
.topbar-in{display:flex;align-items:center;gap:24px;height:38px}
.topbar-brand{letter-spacing:.06em;color:rgba(255,255,255,.72)}
.topbar-note{margin-left:8px;color:rgba(255,255,255,.9);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.topbar-link{margin-left:auto;color:#fff;border-bottom:1px solid rgba(255,255,255,.45);padding-bottom:1px;transition:border-color 180ms var(--ease),color 180ms var(--ease)}
.topbar-link:hover{border-color:var(--accent);color:var(--accent-soft)}
@media (max-width:991.98px){
  .topbar-brand,.topbar-note{display:none}
  .topbar-link{margin-left:auto}
}

/* ---------- 主导航 ---------- */
.site-header{position:sticky;top:0;z-index:60;background:rgba(255,255,255,.94);backdrop-filter:blur(8px)}
.site-header.is-scrolled{box-shadow:0 1px 0 var(--line),0 8px 24px -18px rgba(16,20,19,.4)}
.nav-in{display:flex;align-items:center;gap:32px;height:72px}
.logo{display:flex;align-items:baseline;gap:2px;font-family:"Noto Serif SC",serif;font-size:20px;letter-spacing:-.01em;color:var(--ink-dark)}
.logo-mark{font-weight:700;color:var(--ink);letter-spacing:.02em}
.logo-txt{font-weight:600}
.logo-dot{width:6px;height:6px;background:var(--accent);border-radius:1px;display:inline-block;margin-left:6px;transform:translateY(-2px)}
.main-nav{display:flex;align-items:center;gap:28px;margin-left:auto}
.main-nav a{position:relative;font-size:15px;color:var(--text-2);padding:6px 0;transition:color 180ms var(--ease)}
.main-nav a:hover{color:var(--ink)}
.main-nav a.is-active{color:var(--text);font-weight:600}
.main-nav a.is-active::after{content:"";position:absolute;left:0;right:0;bottom:-4px;height:2px;background:var(--accent);border-radius:2px}
.nav-actions{display:flex;align-items:center;gap:12px}
.icon-btn{width:40px;height:40px;display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--line);background:#fff;border-radius:var(--r-btn);color:var(--text-2);cursor:pointer;transition:all 180ms var(--ease)}
.icon-btn:hover{border-color:var(--ink);color:var(--ink)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-size:15px;font-weight:500;line-height:1;padding:12px 22px;border-radius:var(--r-btn);border:1px solid transparent;cursor:pointer;transition:all 180ms var(--ease);text-align:center}
.btn-primary{background:var(--ink);color:#fff}
.btn-primary:hover{background:var(--ink-dark);color:#fff;transform:translateY(-1px);box-shadow:var(--sh-2)}
.btn-primary:active{transform:translateY(0);box-shadow:none}
.btn-ghost{background:#fff;border-color:var(--line);color:var(--text)}
.btn-ghost:hover{border-color:var(--ink);color:var(--ink)}
.btn-sm{padding:10px 18px;font-size:14px}
.btn-block{width:100%}
.burger{display:none;width:44px;height:44px;border:1px solid var(--line);background:#fff;border-radius:var(--r-btn);cursor:pointer;position:relative}
.burger span{position:absolute;left:12px;right:12px;height:1.5px;background:var(--text);transition:transform 320ms var(--ease),opacity 180ms var(--ease)}
.burger span:nth-child(1){top:15px}
.burger span:nth-child(2){top:21px}
.burger span:nth-child(3){top:27px}
@media (max-width:991.98px){
  .main-nav,.nav-actions .btn{display:none}
  .burger{display:inline-block}
  .nav-in{gap:16px;justify-content:space-between}
}
/* 抽屉 */
.drawer{position:fixed;inset:0 0 0 auto;width:min(86vw,340px);background:var(--surface);z-index:80;transform:translateX(102%);transition:transform 320ms var(--ease);display:flex;flex-direction:column;padding:20px;overflow-y:auto}
.drawer.is-open{transform:translateX(0)}
.drawer-mask{position:fixed;inset:0;background:rgba(16,20,19,.4);opacity:0;visibility:hidden;transition:opacity 320ms var(--ease),visibility 320ms;z-index:70}
.drawer-mask.is-open{opacity:1;visibility:visible}
.drawer-close{align-self:flex-end;width:44px;height:44px;border:1px solid var(--line);background:#fff;border-radius:var(--r-btn);cursor:pointer;color:var(--text-2)}
.drawer h3{font-size:13px;letter-spacing:.14em;color:var(--text-3);font-family:"Noto Sans SC",sans-serif;font-weight:500;margin:24px 0 10px}
.drawer-nav{display:flex;flex-direction:column}
.drawer-nav a{padding:14px 0;border-bottom:1px solid var(--line);font-size:16px;color:var(--text-2)}
.drawer-nav a.is-active{color:var(--ink);font-weight:600}
.drawer .btn{margin-top:24px}
.drawer-note{font-size:13px;color:var(--text-3);margin-top:16px;line-height:1.8}

/* ---------- 面包屑 ---------- */
.crumbs{padding:28px 0 0;font-size:13px;color:var(--text-3);display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.crumbs a{color:var(--text-2);transition:color 180ms var(--ease)}
.crumbs a:hover{color:var(--ink)}
.crumbs .sep{color:var(--line)}

/* ---------- 文章头部 ---------- */
.post-head{padding:28px 0 0}
.cat-pill{display:inline-flex;align-items:center;gap:8px;font-size:13px;color:var(--ink);background:var(--accent-soft);border-radius:var(--r-pill);padding:6px 14px;letter-spacing:.02em}
.post-head h1{font-size:clamp(30px,4vw,50px);line-height:1.2;margin:20px 0 0;letter-spacing:-.02em}
.post-meta{display:flex;flex-wrap:wrap;gap:10px 22px;align-items:center;margin-top:20px;font-size:14px;color:var(--text-3)}
.post-meta .dot{width:4px;height:4px;background:var(--line);border-radius:50%}
.post-rule{height:1px;background:var(--line);margin-top:32px}
.post-cover{margin-top:40px}
.post-cover img{width:100%;aspect-ratio:16/9;object-fit:cover;border:1px solid var(--line);border-radius:var(--r-card)}
.post-cover figcaption{margin-top:12px;font-size:14px;color:var(--text-3);text-align:center}

/* ---------- 正文布局 ---------- */
.post-shell{padding:48px 0 0;display:grid;gap:48px;grid-template-columns:minmax(0,1fr);justify-content:center}
@media (min-width:1200px){
  .post-shell{grid-template-columns:240px minmax(0,760px)}
}
.toc{display:none}
@media (min-width:1200px){
  .toc{display:block;position:sticky;top:120px;align-self:start}
}
.toc-title{font-size:13px;letter-spacing:.14em;color:var(--text-3);font-family:"Noto Sans SC",sans-serif;font-weight:500;margin-bottom:14px}
.toc-list{display:flex;flex-direction:column;border-left:1px solid var(--line)}
.toc-link{display:block;font-size:14px;line-height:1.6;color:var(--text-2);padding:7px 0 7px 16px;border-left:2px solid transparent;margin-left:-1px;transition:color 180ms var(--ease),border-color 180ms var(--ease)}
.toc-link:hover{color:var(--ink)}
.toc-link.is-sub{padding-left:30px;font-size:13px;color:var(--text-3)}
.toc-link.is-active{color:var(--ink);font-weight:600;border-left-color:var(--accent)}

.article-body{font-size:17px;line-height:1.95;color:var(--text);max-width:760px}
.article-body > * + *{margin-top:22px}
.article-body h2{font-size:24px;line-height:1.4;margin-top:48px;margin-bottom:16px;padding-left:16px;position:relative}
.article-body h2::before{content:"";position:absolute;left:0;top:.42em;width:4px;height:1.05em;background:var(--accent);border-radius:2px}
.article-body h3{font-size:20px;line-height:1.45;margin-top:34px;margin-bottom:12px}
.article-body ul,.article-body ol{padding-left:22px;margin:0}
.article-body li{margin:8px 0;line-height:1.85}
.article-body li::marker{color:var(--ink-light)}
.article-body blockquote{margin:28px 0;padding:16px 22px;border-left:3px solid var(--ink);background:#fff;border-radius:0 8px 8px 0;color:var(--text-2)}
.article-body img{border-radius:var(--r-card);border:1px solid var(--line);margin:26px 0 10px}
.article-body figure{margin:26px 0}
.article-body figcaption{font-size:14px;color:var(--text-3);text-align:center}
.article-body a{color:var(--ink);border-bottom:1px solid var(--accent-soft);transition:border-color 180ms var(--ease),color 180ms var(--ease)}
.article-body a:hover{color:var(--accent);border-color:var(--accent)}
.article-body table{width:100%;border-collapse:collapse;font-size:15px;display:block;overflow-x:auto}
.article-body th,.article-body td{border:1px solid var(--line);padding:12px 14px;text-align:left}
.article-body thead th{background:#fff;font-weight:600}
.article-body tbody tr:nth-child(even){background:#FBFAF7}
.article-body code{background:var(--ph);border-radius:6px;padding:2px 7px;font-size:14px}
.article-body pre{background:#fff;border:1px solid var(--line);border-radius:8px;padding:16px;overflow-x:auto}
.empty-state{background:#fff;border:1px solid var(--line);border-radius:var(--r-card);padding:56px 32px;text-align:center}
.empty-state i{font-size:24px;color:var(--ink);display:block;margin-bottom:14px}
.empty-state h2{font-size:22px;margin-bottom:10px}
.empty-state p{color:var(--text-2);font-size:16px;margin-bottom:22px}

/* ---------- 文末 ---------- */
.post-foot{margin-top:56px;padding-top:32px;border-top:1px solid var(--line)}
.tag-row{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.tag-row .label{font-size:13px;color:var(--text-3);letter-spacing:.08em}
.tag{display:inline-flex;align-items:center;font-size:13px;color:var(--ink);background:#fff;border:1px solid var(--line);border-radius:var(--r-pill);padding:6px 14px;transition:all 180ms var(--ease)}
.tag:hover{border-color:var(--ink);background:var(--accent-soft)}
.post-nav{display:grid;gap:20px;margin-top:40px}
@media (min-width:768px){.post-nav{grid-template-columns:1fr 1fr}}
.post-nav a{background:#fff;border:1px solid var(--line);border-radius:var(--r-card);padding:22px;display:flex;flex-direction:column;gap:10px;transition:transform 180ms var(--ease),box-shadow 180ms var(--ease),border-color 180ms var(--ease)}
.post-nav a:hover{transform:translateY(-2px);box-shadow:var(--sh-2);border-color:var(--ink)}
.post-nav .k{font-size:13px;color:var(--text-3);letter-spacing:.08em}
.post-nav .t{font-family:"Noto Serif SC",serif;font-size:18px;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.post-nav .arrow{color:var(--ink);font-size:14px;transition:transform 180ms var(--ease)}
.post-nav a:hover .arrow{transform:translateX(4px)}

/* ---------- 区块通用 ---------- */
.section{padding:96px 0}
@media (max-width:991.98px){.section{padding:72px 0}}
@media (max-width:575.98px){.section{padding:48px 0}}
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:40px}
.sec-head .num{font-family:Inter,system-ui,sans-serif;font-size:13px;letter-spacing:.18em;color:var(--accent);display:block;margin-bottom:10px}
.sec-head h2{font-size:clamp(24px,2.6vw,34px);line-height:1.25}
.sec-head p{margin-top:10px;font-size:15px;color:var(--text-2)}
.link-more{font-size:15px;color:var(--ink);border-bottom:1px solid var(--accent-soft);padding-bottom:2px;white-space:nowrap;transition:border-color 180ms var(--ease),color 180ms var(--ease)}
.link-more:hover{color:var(--accent);border-color:var(--accent)}

/* 卡片 */
.card-list{display:grid;gap:32px;grid-template-columns:repeat(3,minmax(0,1fr))}
@media (max-width:991.98px){.card-list{grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}}
@media (max-width:575.98px){.card-list{grid-template-columns:1fr}}
.card{display:flex;flex-direction:column;background:transparent}
.card-media{position:relative;border-radius:var(--r-card);overflow:hidden;border:1px solid var(--line)}
.card-media img{width:100%;aspect-ratio:16/9;object-fit:cover;transition:transform 600ms var(--ease)}
.card:hover .card-media img{transform:scale(1.03)}
.card-media::after{content:"";position:absolute;inset:0;background:rgba(16,20,19,0);transition:background 320ms var(--ease)}
.card:hover .card-media::after{background:rgba(16,20,19,.08)}
.card-tag{position:absolute;top:12px;left:12px;z-index:2;font-size:12px;color:var(--ink);background:var(--accent-soft);border-radius:var(--r-pill);padding:5px 12px}
.card h3{margin-top:18px;font-size:19px;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.card h3 a:hover{color:var(--ink-light)}
.card p{margin-top:12px;font-size:15px;line-height:1.8;color:var(--text-2);display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.card-foot{margin-top:18px;padding-top:14px;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;font-size:13px;color:var(--text-3)}
.card-foot .go{color:var(--ink);transition:transform 180ms var(--ease)}
.card:hover .card-foot .go{transform:translateX(4px)}

/* ---------- FAQ ---------- */
.faq-wrap{margin-top:48px;border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-q{width:100%;background:none;border:0;display:flex;align-items:center;justify-content:space-between;gap:20px;text-align:left;padding:22px 0;font-size:17px;font-weight:500;color:var(--text);cursor:pointer;position:relative}
.faq-q:hover{color:var(--ink)}
.faq-icon{position:relative;flex:0 0 18px;height:18px}
.faq-icon::before,.faq-icon::after{content:"";position:absolute;background:var(--text-3);transition:background 180ms var(--ease),transform 320ms var(--ease)}
.faq-icon::before{left:0;right:0;top:8px;height:1.5px}
.faq-icon::after{top:0;bottom:0;left:8px;width:1.5px}
.faq-item.is-open .faq-icon::after{transform:scaleY(0)}
.faq-item.is-open .faq-icon::before{background:var(--accent)}
.faq-item.is-open .faq-q{color:var(--ink)}
.faq-a{display:grid;grid-template-rows:0fr;transition:grid-template-rows 320ms var(--ease)}
.faq-item.is-open .faq-a{grid-template-rows:1fr}
.faq-a > div{overflow:hidden}
.faq-a p{padding:0 0 22px 0;font-size:16px;color:var(--text-2);line-height:1.9;border-left:3px solid transparent}
.faq-item.is-open .faq-a p{border-left-color:var(--accent);padding-left:16px}

/* ---------- CTA ---------- */
.cta-band{background:var(--dark);color:#fff;padding:72px 0;margin-top:96px}
.cta-in{display:grid;gap:32px;align-items:center}
@media (min-width:992px){.cta-in{grid-template-columns:1.2fr 1fr}}
.cta-band h2{color:#fff;font-size:clamp(24px,2.6vw,34px);line-height:1.3}
.cta-band p{color:rgba(255,255,255,.72);margin-top:14px;font-size:16px;max-width:520px}
.cta-actions{display:flex;gap:14px;flex-wrap:wrap;justify-content:flex-start}
@media (min-width:992px){.cta-actions{justify-content:flex-end}}
.cta-band .btn-primary{background:var(--accent);color:#fff}
.cta-band .btn-primary:hover{background:#B04E2B}
.cta-band .btn-ghost{background:transparent;border-color:rgba(255,255,255,.28);color:#fff}
.cta-band .btn-ghost:hover{border-color:#fff;color:#fff}

/* ---------- 页脚 ---------- */
.footer{background:var(--dark);color:rgba(255,255,255,.72);padding:72px 0 28px;font-size:15px}
.footer-grid{display:grid;gap:40px;grid-template-columns:repeat(4,minmax(0,1fr))}
@media (max-width:991.98px){.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:575.98px){.footer-grid{grid-template-columns:1fr}}
.footer-brand{display:flex;align-items:baseline;gap:2px;font-family:"Noto Serif SC",serif;font-size:19px;color:#fff;margin-bottom:16px}
.footer-brand .brand-mark{font-weight:700;letter-spacing:.02em}
.footer p{font-size:14px;line-height:1.9;color:rgba(255,255,255,.6)}
.footer h4{font-family:"Noto Sans SC",sans-serif;font-size:14px;font-weight:600;color:#fff;margin-bottom:18px;letter-spacing:.04em}
.footer-links{display:flex;flex-direction:column;gap:12px}
.footer-links a{font-size:14px;color:rgba(255,255,255,.7);transition:color 180ms var(--ease),transform 180ms var(--ease);transform:translateX(0);display:inline-block}
.footer-links a:hover{color:var(--accent-soft);transform:translateX(2px)}
.footer-info{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:12px;font-size:14px}
.footer-info li{display:flex;justify-content:space-between;gap:16px;border-bottom:1px solid rgba(255,255,255,.08);padding-bottom:10px}
.footer-info li span:first-child{color:rgba(255,255,255,.5)}
.footer-info li span:last-child{color:#fff}
.footer-bottom{margin-top:56px;padding-top:22px;border-top:1px solid rgba(255,255,255,.1);display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;font-size:13px;color:rgba(255,255,255,.5)}
.footer-bottom a{color:rgba(255,255,255,.7);border-bottom:1px solid rgba(255,255,255,.25)}
.footer-bottom a:hover{color:var(--accent-soft);border-color:var(--accent-soft)}

/* ---------- 返回顶部 ---------- */
.to-top{position:fixed;right:24px;bottom:24px;width:44px;height:44px;border-radius:var(--r-btn);background:var(--ink);color:#fff;border:0;display:flex;align-items:center;justify-content:center;cursor:pointer;opacity:0;visibility:hidden;transform:translateY(8px);transition:all 320ms var(--ease);z-index:50}
.to-top.is-on{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{background:var(--ink-dark)}

/* ---------- 入场 ---------- */
.reveal{opacity:0;transform:translateY(12px);transition:opacity 600ms var(--ease),transform 600ms var(--ease)}
.reveal.is-in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  .reveal{opacity:1;transform:none}
  html{scroll-behavior:auto}
}

/* roulang page: category1 */
:root{
  --bs-primary:#0F3D3E;
  --bs-body-font-family:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --bs-body-color:#151A19;
  --bs-body-bg:#F6F3EE;
  --bs-border-radius:10px;
  --bs-link-color:#0F3D3E;
  --bs-link-hover-color:#C75B33;

  --ink:#0F3D3E;
  --ink-d:#0A2C2D;
  --ink-l:#1C5C5A;
  --accent:#C75B33;
  --accent-l:#F2D8CB;
  --bg:#F6F3EE;
  --surface:#FFFFFF;
  --dark:#101413;
  --text:#151A19;
  --muted:#5A635F;
  --faint:#8A918D;
  --border:#E2DCD2;
  --ph:#E9E5DE;
  --r-card:10px;
  --r-btn:6px;
  --r-input:8px;
  --shadow-1:0 1px 2px rgba(16,20,19,.05);
  --shadow-2:0 12px 32px -12px rgba(16,20,19,.18);
  --ease:cubic-bezier(.22,.61,.36,1);
  --font-serif:"Noto Serif SC","Songti SC","Source Han Serif SC",Georgia,serif;
  --font-sans:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-num:"Inter",system-ui,-apple-system,"Segoe UI",sans-serif;
  --container:1200px;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.9;
  color:var(--text);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:var(--ink);text-decoration:none;transition:color .18s var(--ease),border-color .18s var(--ease);}
a:hover{color:var(--accent);}
button{font-family:inherit;}
h1,h2,h3,h4{font-family:var(--font-serif);font-weight:600;color:var(--text);margin:0;line-height:1.24;letter-spacing:-.01em;}
p{margin:0;}
ul{margin:0;padding:0;list-style:none;}
input{font-family:inherit;}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;}

.container-x{width:100%;max-width:var(--container);margin:0 auto;padding:0 24px;}
@media (min-width:1400px){.container-x{max-width:1280px;}}
@media (max-width:767px){.container-x{padding:0 16px;}}

/* ============ 顶部信息条 ============ */
.topbar{background:var(--ink);color:#fff;font-size:13px;line-height:1.4;}
.topbar-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;height:38px;}
.topbar-site{font-family:var(--font-num);letter-spacing:.04em;opacity:.82;white-space:nowrap;}
.topbar-note{flex:1;text-align:center;opacity:.82;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.topbar-link{color:#fff;border-bottom:1px solid rgba(255,255,255,.5);padding-bottom:1px;white-space:nowrap;transition:color .18s var(--ease),border-color .18s var(--ease);}
.topbar-link:hover{color:var(--accent-l);border-color:var(--accent-l);}
@media (max-width:767px){
  .topbar-site,.topbar-note{display:none;}
  .topbar-inner{justify-content:flex-end;}
}

/* ============ 主导航 ============ */
.site-header{position:sticky;top:0;z-index:1040;background:#fff;}
.nav-bar{border-bottom:1px solid transparent;background:rgba(255,255,255,.96);backdrop-filter:saturate(120%) blur(6px);transition:border-color .32s var(--ease),box-shadow .32s var(--ease);}
.site-header.is-scrolled .nav-bar{border-bottom-color:var(--border);box-shadow:0 8px 22px -16px rgba(16,20,19,.35);}
.nav-inner{display:flex;align-items:center;gap:36px;height:72px;}
.brand{display:flex;align-items:baseline;gap:5px;flex-shrink:0;}
.brand-mark{font-family:var(--font-num);font-weight:700;font-size:20px;letter-spacing:-.02em;color:var(--ink);}
.brand-mark::after{content:"";display:inline-block;width:5px;height:5px;background:var(--accent);margin-left:4px;vertical-align:2px;}
.brand-text{font-family:var(--font-serif);font-weight:700;font-size:18px;color:var(--ink);}
.main-nav{display:flex;align-items:center;gap:30px;margin-left:auto;}
.main-nav a{position:relative;font-size:15px;font-weight:500;color:var(--muted);padding:26px 0;}
.main-nav a::after{content:"";position:absolute;left:0;right:0;bottom:17px;height:2px;background:var(--accent);transform:scaleX(0);transform-origin:left;transition:transform .32s var(--ease);}
.main-nav a:hover{color:var(--ink);}
.main-nav a:hover::after,.main-nav a.is-active::after{transform:scaleX(1);}
.main-nav a.is-active{color:var(--ink);font-weight:600;}
.nav-actions{display:flex;align-items:center;gap:12px;flex-shrink:0;}
.icon-btn{width:44px;height:44px;display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--border);border-radius:var(--r-btn);background:#fff;color:var(--ink);cursor:pointer;transition:border-color .18s var(--ease),color .18s var(--ease),background .18s var(--ease);}
.icon-btn:hover{border-color:var(--ink);background:var(--bg);}
.icon-btn svg{width:18px;height:18px;}
.hamburger{display:none;width:44px;height:44px;border:1px solid var(--border);border-radius:var(--r-btn);background:#fff;cursor:pointer;position:relative;}
.hamburger span{position:absolute;left:12px;right:12px;height:1.5px;background:var(--ink);transition:transform .32s var(--ease),opacity .18s var(--ease);}
.hamburger span:nth-child(1){top:16px;}
.hamburger span:nth-child(2){top:22px;}
.hamburger span:nth-child(3){top:28px;}
.hamburger.is-open span:nth-child(1){transform:translateY(6px) rotate(45deg);}
.hamburger.is-open span:nth-child(2){opacity:0;}
.hamburger.is-open span:nth-child(3){transform:translateY(-6px) rotate(-45deg);}

.search-strip{border-top:1px solid var(--border);background:#fff;display:none;}
.search-strip.is-open{display:block;}
.search-strip form{display:flex;gap:12px;padding:16px 0;}
.search-strip input{flex:1;height:46px;border:1px solid var(--border);border-radius:var(--r-input);padding:0 16px;font-size:15px;background:#fff;color:var(--text);}
.search-strip input:focus{outline:none;border-color:var(--ink);box-shadow:0 0 0 2px var(--accent-l);}

/* ============ 按钮 ============ */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:46px;padding:0 22px;border-radius:var(--r-btn);border:1px solid transparent;font-size:15px;font-weight:500;cursor:pointer;transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease),box-shadow .18s var(--ease);}
.btn-sm{height:40px;padding:0 18px;font-size:14px;}
.btn-primary{background:var(--ink);color:#fff;}
.btn-primary:hover{background:var(--ink-d);color:#fff;transform:translateY(-1px);box-shadow:var(--shadow-2);}
.btn-primary:active{transform:translateY(0);box-shadow:none;}
.btn-ghost{background:#fff;border-color:var(--border);color:var(--text);}
.btn-ghost:hover{border-color:var(--ink);color:var(--ink);}
.btn-onlight{background:#fff;color:var(--ink);border-color:#fff;}
.btn-onlight:hover{background:var(--accent-l);color:var(--ink-d);border-color:var(--accent-l);}
.btn-outline-light{background:transparent;border-color:rgba(255,255,255,.34);color:#fff;}
.btn-outline-light:hover{border-color:#fff;color:#fff;}
.link-line{position:relative;display:inline-block;color:var(--ink);font-weight:500;}
.link-line::after{content:"";position:absolute;left:0;bottom:-3px;width:100%;height:1px;background:currentColor;transform:scaleX(0);transform-origin:left;transition:transform .32s var(--ease);}
.link-line:hover::after{transform:scaleX(1);}

/* ============ 通用区块 ============ */
.section{padding:96px 0;}
@media (max-width:991px){.section{padding:72px 0;}}
@media (max-width:767px){.section{padding:48px 0;}}
.section-tight{padding-top:0;}
.section-alt{background:var(--surface);border-top:1px solid var(--border);border-bottom:1px solid var(--border);}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:32px;margin-bottom:40px;}
.section-head .num{display:block;font-family:var(--font-num);font-size:13px;letter-spacing:.2em;color:var(--accent);margin-bottom:12px;}
.section-head h2{font-size:clamp(26px,3vw,40px);display:flex;align-items:center;gap:14px;}
.section-head h2::before{content:"";width:0;height:2px;background:var(--accent);transition:width .6s var(--ease);}
.is-visible .section-head h2::before,.section-head.is-visible h2::before{width:28px;}
.section-head .sub{margin-top:10px;font-size:15px;color:var(--muted);max-width:560px;}
.lead{font-size:17px;line-height:1.9;color:var(--muted);max-width:720px;}

.reveal{opacity:0;transform:translateY(12px);transition:opacity .6s var(--ease),transform .6s var(--ease);}
.reveal.is-visible{opacity:1;transform:none;}

/* ============ 面包屑与页头 ============ */
.page-head{padding:44px 0 8px;}
.crumbs{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--faint);margin-bottom:26px;flex-wrap:wrap;}
.crumbs a{color:var(--faint);}
.crumbs a:hover{color:var(--ink);}
.crumbs .sep{color:var(--border);}
.crumbs .now{color:var(--muted);}
.page-head h1{font-size:clamp(30px,4.4vw,50px);line-height:1.14;letter-spacing:-.02em;max-width:900px;}
.page-head .intro{margin-top:20px;font-size:18px;color:var(--muted);max-width:760px;}
.head-meta{display:flex;flex-wrap:wrap;gap:12px 28px;margin-top:26px;padding-top:22px;border-top:1px solid var(--border);font-size:13px;color:var(--faint);}
.head-meta b{color:var(--ink);font-weight:600;font-family:var(--font-num);letter-spacing:.02em;}

/* ============ 指引主体：粘性目录 + 分步卡片 ============ */
.guide-layout{display:grid;grid-template-columns:200px minmax(0,1fr);gap:64px;align-items:start;}
.toc{position:sticky;top:112px;}
.toc-title{font-family:var(--font-num);font-size:12px;letter-spacing:.2em;color:var(--faint);margin-bottom:14px;text-transform:uppercase;}
.toc a{display:block;font-size:14px;color:var(--muted);padding:9px 0 9px 14px;border-left:1px solid var(--border);transition:color .18s var(--ease),border-color .18s var(--ease),padding-left .18s var(--ease);}
.toc a:hover,.toc a.is-current{color:var(--ink);border-left-color:var(--accent);font-weight:600;padding-left:17px;}
.step-flow{position:relative;padding-left:56px;}
.step-flow::before{content:"";position:absolute;left:15px;top:10px;bottom:10px;width:1px;background:var(--border);}
.step-item{position:relative;margin-bottom:24px;}
.step-item:last-child{margin-bottom:0;}
.step-item::before{content:"";position:absolute;left:-48px;top:30px;width:11px;height:11px;border-radius:50%;background:var(--bg);border:1px solid var(--accent);}
.step-card{background:#fff;border:1px solid var(--border);border-radius:var(--r-card);padding:26px 30px;box-shadow:var(--shadow-1);transition:transform .32s var(--ease),box-shadow .32s var(--ease),border-color .32s var(--ease);}
.step-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-2);border-color:#D8D0C3;}
.step-num{font-family:var(--font-num);font-size:13px;letter-spacing:.18em;color:var(--accent);}
.step-card h3{font-size:21px;margin:8px 0 12px;}
.step-card p{color:var(--muted);font-size:16px;line-height:1.85;}
.step-points{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px;}
.tag{display:inline-block;font-size:13px;line-height:1.6;padding:4px 12px;border-radius:999px;background:var(--accent-l);color:#8E3C1E;}
.tag-soft{background:var(--ph);color:var(--muted);}
.tag-line{background:transparent;border:1px solid var(--border);color:var(--muted);}

/* ============ 图文区块 ============ */
.split{display:grid;grid-template-columns:1.02fr 1fr;gap:56px;align-items:center;}
.figure{border:1px solid var(--border);border-radius:var(--r-card);overflow:hidden;background:var(--ph);box-shadow:var(--shadow-1);}
.figure img{width:100%;height:100%;object-fit:cover;border-radius:0;}
.figure-43{aspect-ratio:4/3;}
.figure-11{aspect-ratio:1/1;}
.split h2{font-size:clamp(24px,2.6vw,34px);margin-bottom:18px;}
.split p{color:var(--muted);margin-bottom:16px;max-width:640px;}
.check-list{margin-top:8px;}
.check-list li{position:relative;padding-left:26px;margin-bottom:12px;color:var(--muted);font-size:16px;}
.check-list li::before{content:"";position:absolute;left:0;top:12px;width:12px;height:1px;background:var(--accent);}
.check-list li b{color:var(--text);font-weight:600;}

/* ============ 场景非对称网格 ============ */
.scene-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:24px;}
.scene-card{background:#fff;border:1px solid var(--border);border-radius:var(--r-card);padding:28px 30px;box-shadow:var(--shadow-1);transition:transform .32s var(--ease),box-shadow .32s var(--ease);}
.scene-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-2);}
.scene-card:nth-child(1){grid-column:span 7;}
.scene-card:nth-child(2){grid-column:span 5;}
.scene-card:nth-child(3){grid-column:span 5;}
.scene-card:nth-child(4){grid-column:span 7;}
.scene-card .idx{font-family:var(--font-num);font-size:13px;letter-spacing:.18em;color:var(--accent);}
.scene-card h3{font-size:20px;margin:10px 0 10px;}
.scene-card p{font-size:15px;color:var(--muted);line-height:1.85;}

/* ============ 指标条 ============ */
.metrics{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--border);border-bottom:1px solid var(--border);}
.metric{padding:34px 26px;border-right:1px solid var(--border);}
.metric:last-child{border-right:0;}
.metric .value{font-family:var(--font-serif);font-size:clamp(30px,3.4vw,44px);line-height:1.1;color:var(--ink);}
.metric .value span{font-family:var(--font-num);font-size:15px;color:var(--accent);margin-left:6px;letter-spacing:.04em;}
.metric .label{margin-top:10px;font-size:14px;color:var(--muted);line-height:1.75;}

/* ============ FAQ ============ */
.faq{border-top:1px solid var(--border);}
.faq-item{border-bottom:1px solid var(--border);transition:box-shadow .18s var(--ease);}
.faq-item[open]{box-shadow:inset 3px 0 0 var(--accent);}
.faq-item summary{list-style:none;cursor:pointer;position:relative;padding:22px 52px 22px 22px;font-size:17px;font-weight:600;color:var(--text);}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::before{content:"";position:absolute;right:20px;top:50%;width:14px;height:1.5px;background:var(--ink);transform:translateY(-50%);transition:background .18s var(--ease);}
.faq-item summary::after{content:"";position:absolute;right:26.5px;top:50%;width:1.5px;height:14px;background:var(--ink);transform:translateY(-50%);transition:transform .32s var(--ease),background .18s var(--ease);}
.faq-item[open] summary::after{transform:translateY(-50%) scaleY(0);}
.faq-item[open] summary::before,.faq-item[open] summary::after{background:var(--accent);}
.faq-item summary:hover{color:var(--ink);}
.faq-body{padding:0 52px 24px 22px;color:var(--muted);font-size:16px;line-height:1.9;}

/* ============ CTA 深色条 ============ */
.cta-band{background:var(--dark);color:#fff;padding:76px 0;border-top:1px solid rgba(255,255,255,.08);}
.cta-inner{display:flex;align-items:center;justify-content:space-between;gap:48px;}
.cta-band h2{color:#fff;font-size:clamp(24px,2.8vw,36px);margin-bottom:14px;}
.cta-band p{color:rgba(255,255,255,.72);max-width:600px;font-size:16px;}
.cta-actions{display:flex;gap:14px;flex-wrap:wrap;flex-shrink:0;}

/* ============ 页脚 ============ */
.footer{background:var(--dark);color:rgba(255,255,255,.72);padding:72px 0 28px;font-size:15px;}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:40px;padding-bottom:44px;border-bottom:1px solid rgba(255,255,255,.1);}
.footer-brand{display:flex;align-items:baseline;gap:5px;margin-bottom:16px;}
.footer-brand .brand-mark{color:#fff;font-size:19px;}
.footer-brand span:last-child{font-family:var(--font-serif);font-weight:700;font-size:17px;color:#fff;}
.footer p{font-size:14px;line-height:1.85;color:rgba(255,255,255,.62);max-width:340px;}
.footer h4{color:#fff;font-size:15px;margin-bottom:18px;font-family:var(--font-sans);font-weight:600;letter-spacing:.02em;}
.footer-links a{display:block;color:rgba(255,255,255,.68);font-size:14px;padding:6px 0;transition:color .18s var(--ease),transform .18s var(--ease);}
.footer-links a:hover{color:var(--accent-l);transform:translateX(2px);}
.footer-info li{display:flex;justify-content:space-between;gap:12px;font-size:14px;padding:7px 0;border-bottom:1px dashed rgba(255,255,255,.1);}
.footer-info li span:first-child{color:rgba(255,255,255,.55);}
.footer-info li span:last-child{color:rgba(255,255,255,.82);}
.footer-bottom{display:flex;justify-content:space-between;gap:16px;padding-top:22px;font-size:13px;color:rgba(255,255,255,.5);flex-wrap:wrap;}
.footer-bottom a{color:rgba(255,255,255,.62);}
.footer-bottom a:hover{color:var(--accent-l);}

/* ============ 返回顶部 ============ */
.to-top{position:fixed;right:24px;bottom:24px;width:44px;height:44px;border-radius:var(--r-btn);background:var(--ink);color:#fff;border:0;display:flex;align-items:center;justify-content:center;cursor:pointer;opacity:0;visibility:hidden;transform:translateY(8px);transition:opacity .32s var(--ease),transform .32s var(--ease),visibility .32s var(--ease);z-index:1030;box-shadow:var(--shadow-2);}
.to-top.is-show{opacity:1;visibility:visible;transform:none;}
.to-top:hover{background:var(--ink-d);}
.to-top svg{width:16px;height:16px;}

/* ============ 移动端抽屉 ============ */
.drawer-mask{position:fixed;inset:0;background:rgba(16,20,19,.42);opacity:0;visibility:hidden;transition:opacity .32s var(--ease),visibility .32s var(--ease);z-index:1050;}
.drawer-mask.is-open{opacity:1;visibility:visible;}
.drawer{position:fixed;top:0;right:0;bottom:0;width:min(340px,86vw);background:#fff;z-index:1060;transform:translateX(100%);transition:transform .32s var(--ease);display:flex;flex-direction:column;padding:24px;overflow-y:auto;}
.drawer.is-open{transform:translateX(0);}
.drawer-top{display:flex;align-items:center;justify-content:space-between;padding-bottom:18px;border-bottom:1px solid var(--border);margin-bottom:22px;}
.drawer-close{width:40px;height:40px;border:1px solid var(--border);border-radius:var(--r-btn);background:#fff;color:var(--ink);cursor:pointer;font-size:18px;line-height:1;}
.drawer-nav a{display:block;font-size:16px;color:var(--muted);padding:13px 0;border-bottom:1px solid var(--border);}
.drawer-nav a.is-active{color:var(--ink);font-weight:600;}
.drawer-note{margin-top:24px;padding:16px;border-radius:var(--r-card);background:var(--bg);border:1px solid var(--border);font-size:13px;color:var(--muted);line-height:1.8;}
.drawer-cta{margin-top:20px;}

@media (max-width:1199px){
  .main-nav{gap:22px;}
  .main-nav a{font-size:14px;}
}
@media (max-width:991px){
  .main-nav{display:none;}
  .hamburger{display:block;}
  .nav-inner{gap:16px;}
  .nav-actions .btn{display:none;}
  .guide-layout{grid-template-columns:1fr;gap:32px;}
  .toc{position:static;display:flex;gap:8px;overflow-x:auto;padding-bottom:6px;}
  .toc-title{display:none;}
  .toc a{border-left:0;border:1px solid var(--border);border-radius:999px;padding:8px 16px;white-space:nowrap;padding-left:16px;}
  .toc a:hover,.toc a.is-current{padding-left:16px;}
  .step-flow{padding-left:0;}
  .step-flow::before{display:none;}
  .step-item::before{display:none;}
  .split{grid-template-columns:1fr;gap:32px;}
  .metrics{grid-template-columns:repeat(2,1fr);}
  .metric:nth-child(2){border-right:0;}
  .metric:nth-child(1),.metric:nth-child(2){border-bottom:1px solid var(--border);}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
  .cta-inner{flex-direction:column;align-items:flex-start;gap:28px;}
}
@media (max-width:767px){
  body{font-size:16px;}
  .scene-grid{grid-template-columns:1fr;gap:16px;}
  .scene-card:nth-child(1),.scene-card:nth-child(2),.scene-card:nth-child(3),.scene-card:nth-child(4){grid-column:span 1;}
  .footer-grid{grid-template-columns:1fr;}
  .footer-bottom{flex-direction:column;gap:8px;}
  .page-head h1{font-size:clamp(26px,7vw,34px);}
  .page-head .intro{font-size:16px;}
  .step-card{padding:22px 20px;}
  .faq-item summary{padding:18px 46px 18px 16px;}
  .faq-body{padding:0 46px 20px 16px;}
  .cta-actions{width:100%;}
  .cta-actions .btn{flex:1;}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;}
  html{scroll-behavior:auto;}
  .reveal{opacity:1;transform:none;}
}

/* roulang page: category2 */
:root{
  --ink-teal:#0F3D3E;
  --ink-teal-dark:#0A2C2D;
  --ink-teal-light:#1C5C5A;
  --clay:#C75B33;
  --clay-light:#F2D8CB;
  --bg:#F6F3EE;
  --surface:#FFFFFF;
  --dark:#101413;
  --text:#151A19;
  --text-2:#5A635F;
  --text-3:#8A918D;
  --border:#E2DCD2;
  --ph:#E9E5DE;
  --radius-card:10px;
  --radius-btn:6px;
  --radius-input:8px;
  --shadow-1:0 1px 2px rgba(16,20,19,.05);
  --shadow-2:0 12px 32px -12px rgba(16,20,19,.18);
  --ease:cubic-bezier(.22,.61,.36,1);
  --t-fast:180ms;
  --t-mid:320ms;
  --t-slow:600ms;
}

*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  font-size:17px;
  line-height:1.9;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,.serif{
  font-family:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",Georgia,serif;
  color:var(--text);
  font-weight:600;
  letter-spacing:-0.01em;
}
h1{font-size:clamp(34px,5vw,60px);line-height:1.12;letter-spacing:-0.02em;font-weight:700;}
h2{font-size:clamp(26px,3vw,40px);line-height:1.2;}
h3{font-size:20px;line-height:1.35;}
p{margin:0 0 22px;}
a{color:var(--ink-teal);text-decoration:none;transition:color var(--t-fast) var(--ease);}
a:hover{color:var(--clay);}
img{max-width:100%;display:block;}
ul,ol{margin:0;padding:0;list-style:none;}
button{font-family:inherit;}
:focus-visible{outline:2px solid var(--clay);outline-offset:2px;}

.container-x{
  width:100%;
  max-width:1200px;
  margin:0 auto;
  padding-left:24px;
  padding-right:24px;
}
@media (min-width:1400px){
  .container-x{max-width:1280px;}
}
@media (max-width:575px){
  .container-x{padding-left:16px;padding-right:16px;}
}

.section{padding:96px 0;}
.section-sm{padding:64px 0;}
@media (max-width:991px){
  .section{padding:72px 0;}
  .section-sm{padding:52px 0;}
}
@media (max-width:575px){
  .section{padding:48px 0;}
  .section-sm{padding:40px 0;}
}

/* ---------- 顶部信息条 ---------- */
.topbar{
  background:var(--ink-teal);
  color:#fff;
  font-size:13px;
  line-height:1;
  min-height:38px;
  display:flex;
  align-items:center;
}
.topbar-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  min-height:38px;
  width:100%;
}
.topbar-domain{
  font-family:Inter,system-ui,sans-serif;
  letter-spacing:.06em;
  color:rgba(255,255,255,.78);
  white-space:nowrap;
}
.topbar-note{
  color:rgba(255,255,255,.84);
  white-space:nowrap;
  overflow:hidden;
  text-overflow:ellipsis;
}
.topbar-link{
  color:#fff;
  border-bottom:1px solid rgba(255,255,255,.5);
  padding-bottom:2px;
  white-space:nowrap;
  transition:border-color var(--t-mid) var(--ease),color var(--t-mid) var(--ease);
}
.topbar-link:hover{color:var(--clay-light);border-color:var(--clay-light);}
@media (max-width:767px){
  .topbar-domain,.topbar-note{display:none;}
  .topbar-inner{justify-content:flex-end;}
}

/* ---------- 主导航 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:900;
  background:rgba(255,255,255,.94);
  backdrop-filter:saturate(150%) blur(6px);
  border-bottom:1px solid transparent;
  transition:border-color var(--t-mid) var(--ease),box-shadow var(--t-mid) var(--ease);
}
.site-header.is-scrolled{
  border-bottom-color:var(--border);
  box-shadow:0 1px 2px rgba(16,20,19,.05);
}
.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  min-height:72px;
}
.brand{
  display:inline-flex;
  align-items:baseline;
  gap:8px;
  font-family:"Noto Serif SC","Songti SC",serif;
  font-weight:700;
  font-size:20px;
  color:var(--text);
  letter-spacing:-0.01em;
  white-space:nowrap;
}
.brand:hover{color:var(--ink-teal);}
.brand-mark{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  background:var(--ink-teal);
  color:#fff;
  font-family:Inter,system-ui,sans-serif;
  font-size:14px;
  font-weight:600;
  letter-spacing:.04em;
  padding:4px 9px;
  border-radius:6px;
  text-transform:lowercase;
}
.brand-text{font-size:20px;}

.main-nav{
  display:flex;
  align-items:center;
  gap:28px;
}
.main-nav a{
  position:relative;
  font-size:15px;
  color:var(--text-2);
  padding:6px 0;
  font-weight:400;
  white-space:nowrap;
}
.main-nav a::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:-2px;
  height:2px;
  background:var(--clay);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform var(--t-mid) var(--ease);
}
.main-nav a:hover{color:var(--text);}
.main-nav a:hover::after{transform:scaleX(1);}
.main-nav a.is-active{color:var(--text);font-weight:600;}
.main-nav a.is-active::after{transform:scaleX(1);}

.header-actions{display:flex;align-items:center;gap:12px;}
.icon-btn{
  width:40px;height:40px;
  display:inline-flex;align-items:center;justify-content:center;
  border:1px solid var(--border);
  background:var(--surface);
  border-radius:var(--radius-btn);
  color:var(--text-2);
  cursor:pointer;
  transition:color var(--t-fast) var(--ease),border-color var(--t-fast) var(--ease);
}
.icon-btn:hover{color:var(--ink-teal);border-color:var(--ink-teal-light);}

.nav-toggle{
  display:none;
  width:44px;height:44px;
  align-items:center;justify-content:center;
  border:1px solid var(--border);
  background:var(--surface);
  border-radius:var(--radius-btn);
  cursor:pointer;
  position:relative;
}
.nav-toggle span{
  position:absolute;
  left:12px;right:12px;
  height:1.5px;
  background:var(--ink-teal);
  transition:transform var(--t-mid) var(--ease),opacity var(--t-fast) var(--ease);
}
.nav-toggle span:nth-child(1){top:16px;}
.nav-toggle span:nth-child(2){top:21px;}
.nav-toggle span:nth-child(3){top:26px;}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(5px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-5px) rotate(-45deg);}

@media (max-width:991px){
  .main-nav{display:none;}
  .nav-toggle{display:inline-flex;}
  .header-actions .btn{display:none;}
}

/* 移动抽屉 */
.mobile-drawer{
  position:fixed;
  top:0;right:0;
  width:min(340px,86vw);
  height:100%;
  background:var(--surface);
  border-left:1px solid var(--border);
  transform:translateX(102%);
  transition:transform var(--t-mid) var(--ease);
  z-index:1000;
  padding:88px 24px 32px;
  overflow-y:auto;
}
.mobile-drawer.is-open{transform:translateX(0);box-shadow:var(--shadow-2);}
.mobile-drawer .drawer-title{
  font-size:12px;
  letter-spacing:.14em;
  color:var(--text-3);
  margin-bottom:14px;
  text-transform:uppercase;
}
.mobile-drawer nav{display:flex;flex-direction:column;gap:2px;margin-bottom:28px;}
.mobile-drawer nav a{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:14px 2px;
  border-bottom:1px solid var(--border);
  color:var(--text);
  font-size:16px;
}
.mobile-drawer nav a.is-active{color:var(--ink-teal);font-weight:600;}
.mobile-drawer nav a i{color:var(--text-3);font-size:12px;}
.drawer-note{
  background:var(--bg);
  border:1px solid var(--border);
  border-radius:var(--radius-card);
  padding:14px 16px;
  font-size:13px;
  line-height:1.75;
  color:var(--text-2);
  margin-bottom:20px;
}
body.drawer-open{overflow:hidden;}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  font-size:15px;
  font-weight:500;
  line-height:1;
  padding:13px 24px;
  border-radius:var(--radius-btn);
  border:1px solid transparent;
  cursor:pointer;
  transition:background-color var(--t-mid) var(--ease),color var(--t-mid) var(--ease),
             border-color var(--t-mid) var(--ease),transform var(--t-mid) var(--ease),
             box-shadow var(--t-mid) var(--ease);
  text-decoration:none;
}
.btn-primary{background:var(--ink-teal);color:#fff;}
.btn-primary:hover{background:var(--ink-teal-dark);color:#fff;transform:translateY(-1px);box-shadow:var(--shadow-2);}
.btn-primary:active{transform:translateY(0);box-shadow:none;}
.btn-ghost{background:var(--surface);color:var(--text);border-color:var(--border);}
.btn-ghost:hover{border-color:var(--ink-teal);color:var(--ink-teal);transform:translateY(-1px);}
.btn-ghost:active{transform:translateY(0);}
.btn-sm{padding:10px 18px;font-size:14px;}
.btn-light{background:#fff;color:var(--ink-teal);}
.btn-light:hover{background:var(--clay-light);color:var(--ink-teal-dark);transform:translateY(-1px);}
.btn-outline-light{background:transparent;color:#fff;border-color:rgba(255,255,255,.4);}
.btn-outline-light:hover{border-color:#fff;color:#fff;transform:translateY(-1px);}

.link-more{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-size:15px;
  color:var(--ink-teal);
  position:relative;
  padding-bottom:3px;
}
.link-more::after{
  content:"";
  position:absolute;
  left:0;bottom:0;
  width:100%;height:1px;
  background:currentColor;
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform var(--t-mid) var(--ease);
}
.link-more:hover::after{transform:scaleX(1);}
.link-more i{transition:transform var(--t-mid) var(--ease);font-size:12px;}
.link-more:hover i{transform:translateX(4px);}

/* ---------- 面包屑 ---------- */
.breadcrumb-x{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-size:13px;
  color:rgba(255,255,255,.72);
  margin-bottom:22px;
}
.breadcrumb-x a{color:rgba(255,255,255,.86);}
.breadcrumb-x a:hover{color:var(--clay-light);}
.breadcrumb-x .sep{opacity:.5;}

/* ---------- 页面横幅 ---------- */
.page-banner{
  position:relative;
  min-height:360px;
  display:flex;
  align-items:flex-end;
  overflow:hidden;
  background:var(--ink-teal-dark);
}
.page-banner img{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
}
.page-banner::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(90deg,rgba(10,44,45,.92) 0%,rgba(10,44,45,.74) 46%,rgba(10,44,45,.42) 100%);
}
.banner-content{
  position:relative;
  z-index:2;
  padding-top:64px;
  padding-bottom:56px;
  color:#fff;
  max-width:820px;
}
.banner-kicker{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-size:13px;
  letter-spacing:.14em;
  color:var(--clay-light);
  text-transform:uppercase;
  margin-bottom:16px;
}
.banner-kicker::before{
  content:"";
  width:34px;height:1px;
  background:var(--clay-light);
  display:inline-block;
}
.page-banner h1{color:#fff;margin:0 0 18px;max-width:760px;}
.banner-lead{
  font-size:17px;
  line-height:1.8;
  color:rgba(255,255,255,.84);
  max-width:640px;
  margin:0;
}
@media (max-width:767px){
  .page-banner{min-height:320px;}
  .banner-content{padding-top:48px;padding-bottom:40px;}
}

/* ---------- 引言与速览 ---------- */
.intro-grid{
  display:grid;
  grid-template-columns:minmax(0,1.35fr) minmax(0,1fr);
  gap:56px;
  align-items:start;
}
.intro-grid h2{margin:0 0 20px;}
.intro-grid p{color:var(--text-2);margin-bottom:20px;max-width:720px;}
@media (max-width:991px){
  .intro-grid{grid-template-columns:1fr;gap:36px;}
}

.fact-panel{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius-card);
  box-shadow:var(--shadow-1);
  padding:8px 0;
}
.fact-row{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:18px;
  padding:18px 24px;
  border-bottom:1px solid var(--border);
}
.fact-row:last-child{border-bottom:0;}
.fact-num{
  font-family:Inter,system-ui,sans-serif;
  font-size:26px;
  font-weight:600;
  color:var(--ink-teal);
  letter-spacing:-0.02em;
  white-space:nowrap;
}
.fact-label{
  font-size:14px;
  color:var(--text-2);
  text-align:right;
  line-height:1.6;
}

/* ---------- 章节标题组件 ---------- */
.sec-head{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:24px;
  padding-bottom:22px;
  border-bottom:1px solid var(--border);
  margin-bottom:48px;
}
.sec-head-left{max-width:720px;}
.sec-num{
  display:block;
  font-family:Inter,system-ui,sans-serif;
  font-size:13px;
  letter-spacing:.18em;
  color:var(--clay);
  margin-bottom:12px;
}
.sec-head h2{margin:0 0 10px;position:relative;padding-left:0;}
.sec-head .sec-sub{
  margin:0;
  font-size:15px;
  color:var(--text-2);
  max-width:520px;
}
@media (max-width:767px){
  .sec-head{flex-direction:column;align-items:flex-start;margin-bottom:32px;}
}

/* ---------- 步骤时间轴 ---------- */
.step-list{
  position:relative;
  display:flex;
  flex-direction:column;
  gap:72px;
}
.step-list::before{
  content:"";
  position:absolute;
  left:0;
  top:8px;
  bottom:8px;
  width:1px;
  background:var(--border);
}
@media (max-width:767px){
  .step-list::before{display:none;}
  .step-list{gap:48px;}
}
.step{
  position:relative;
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,1fr);
  gap:56px;
  align-items:center;
  padding-left:56px;
}
@media (max-width:991px){
  .step{grid-template-columns:1fr;gap:28px;padding-left:0;}
}
.step::before{
  content:"";
  position:absolute;
  left:-4px;
  top:14px;
  width:9px;height:9px;
  background:var(--bg);
  border:1px solid var(--clay);
  transform:rotate(45deg);
}
@media (max-width:767px){
  .step::before{display:none;}
}
.step-media{
  margin:0;
  border-radius:var(--radius-card);
  overflow:hidden;
  border:1px solid var(--border);
  aspect-ratio:4/3;
  background:var(--ph);
  box-shadow:var(--shadow-1);
}
.step-media img{
  width:100%;height:100%;
  object-fit:cover;
  transition:transform var(--t-slow) var(--ease);
}
.step:hover .step-media img{transform:scale(1.03);}
.step--reverse .step-body{order:2;}
.step--reverse .step-media{order:1;}
@media (max-width:991px){
  .step--reverse .step-body{order:1;}
  .step--reverse .step-media{order:2;}
}
.step-num{
  display:block;
  font-family:Inter,system-ui,sans-serif;
  font-size:13px;
  letter-spacing:.18em;
  color:var(--clay);
  margin-bottom:12px;
}
.step-body h3{margin:0 0 14px;font-size:23px;}
.step-body p{color:var(--text-2);margin-bottom:16px;max-width:560px;}
.step-points{display:flex;flex-direction:column;gap:10px;}
.step-points li{
  position:relative;
  padding-left:20px;
  font-size:15px;
  line-height:1.8;
  color:var(--text-2);
}
.step-points li::before{
  content:"";
  position:absolute;
  left:0;top:13px;
  width:8px;height:1px;
  background:var(--ink-teal-light);
}

/* ---------- 核对表 ---------- */
.table-wrap{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius-card);
  box-shadow:var(--shadow-1);
  overflow:hidden;
}
.verify-table{
  width:100%;
  border-collapse:collapse;
  font-size:15px;
}
.verify-table thead th{
  background:#EFEAE2;
  color:var(--text);
  font-weight:600;
  text-align:left;
  padding:16px 20px;
  border-bottom:1px solid var(--border);
  font-size:14px;
  letter-spacing:.02em;
}
.verify-table td{
  padding:16px 20px;
  border-bottom:1px solid var(--border);
  color:var(--text-2);
  vertical-align:top;
  line-height:1.8;
}
.verify-table tbody tr:nth-child(even){background:#FBFAF7;}
.verify-table tbody tr:last-child td{border-bottom:0;}
.verify-table td:first-child{color:var(--text);font-weight:500;}
@media (max-width:767px){
  .table-wrap{background:transparent;border:0;box-shadow:none;}
  .verify-table thead{display:none;}
  .verify-table,.verify-table tbody,.verify-table tr,.verify-table td{display:block;width:100%;}
  .verify-table tr{
    background:var(--surface);
    border:1px solid var(--border);
    border-radius:var(--radius-card);
    margin-bottom:16px;
    padding:6px 0;
    box-shadow:var(--shadow-1);
  }
  .verify-table td{
    border-bottom:1px dashed var(--border);
    padding:12px 18px;
  }
  .verify-table td:last-child{border-bottom:0;}
  .verify-table td::before{
    content:attr(data-label);
    display:block;
    font-size:12px;
    letter-spacing:.1em;
    color:var(--text-3);
    margin-bottom:4px;
  }
}

/* ---------- 常见误判 ---------- */
.mis-grid{
  display:grid;
  grid-template-columns:minmax(0,1.4fr) minmax(0,1fr);
  gap:40px;
  align-items:start;
}
@media (max-width:991px){
  .mis-grid{grid-template-columns:1fr;gap:32px;}
}
.mis-list{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:20px;
}
@media (max-width:767px){
  .mis-list{grid-template-columns:1fr;}
}
.mis-card{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius-card);
  padding:24px;
  box-shadow:var(--shadow-1);
  transition:transform var(--t-mid) var(--ease),box-shadow var(--t-mid) var(--ease),border-color var(--t-mid) var(--ease);
}
.mis-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-2);border-color:#D6CFC4;}
.mis-card h3{
  font-size:17px;
  margin:0 0 10px;
  display:flex;
  align-items:baseline;
  gap:10px;
}
.mis-card h3 span{
  font-family:Inter,system-ui,sans-serif;
  font-size:12px;
  letter-spacing:.12em;
  color:var(--clay);
}
.mis-card p{font-size:15px;color:var(--text-2);margin:0;line-height:1.8;}
.mis-aside{
  background:var(--surface);
  border:1px solid var(--border);
  border-left:3px solid var(--ink-teal);
  border-radius:var(--radius-card);
  padding:28px;
}
.mis-aside h3{font-size:19px;margin:0 0 14px;}
.mis-aside p{font-size:15px;color:var(--text-2);margin-bottom:18px;}
.tag-set{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:22px;}
.tag{
  display:inline-flex;
  align-items:center;
  font-size:13px;
  line-height:1;
  padding:7px 12px;
  border-radius:999px;
  background:var(--clay-light);
  color:#8A3A1C;
}

/* ---------- FAQ ---------- */
.faq-layout{
  display:grid;
  grid-template-columns:minmax(0,1.55fr) minmax(0,1fr);
  gap:56px;
  align-items:start;
}
@media (max-width:991px){
  .faq-layout{grid-template-columns:1fr;gap:36px;}
}
.faq-list{border-top:1px solid var(--border);}
.faq-item{border-bottom:1px solid var(--border);border-left:3px solid transparent;transition:border-color var(--t-mid) var(--ease);}
.faq-item.is-open{border-left-color:var(--clay);}
.faq-q{
  width:100%;
  background:transparent;
  border:0;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  padding:22px 20px 22px 18px;
  font-size:17px;
  font-weight:500;
  color:var(--text);
  text-align:left;
  cursor:pointer;
  position:relative;
  transition:color var(--t-fast) var(--ease);
}
.faq-q:hover{color:var(--ink-teal);}
.faq-q span{flex:1;}
.faq-q::before,
.faq-q::after{
  content:"";
  position:absolute;
  right:4px;
  top:50%;
  background:var(--ink-teal);
  transition:transform var(--t-mid) var(--ease),opacity var(--t-mid) var(--ease),background-color var(--t-fast) var(--ease);
}
.faq-q::after{width:14px;height:1.5px;transform:translateY(-50%);}
.faq-q::before{width:1.5px;height:14px;transform:translateY(-50%);}
.faq-item.is-open .faq-q::before{transform:translateY(-50%) rotate(90deg);opacity:0;}
.faq-item.is-open .faq-q{color:var(--ink-teal);font-weight:600;}
.faq-a{
  max-height:0;
  overflow:hidden;
  transition:max-height var(--t-mid) var(--ease);
}
.faq-a-inner{padding:0 20px 24px 18px;color:var(--text-2);font-size:16px;line-height:1.85;}
.faq-a-inner p{margin:0;}

.side-card{
  position:sticky;
  top:104px;
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius-card);
  padding:28px;
  box-shadow:var(--shadow-1);
}
.side-card h3{font-size:19px;margin:0 0 16px;}
.side-card ul{display:flex;flex-direction:column;gap:14px;margin-bottom:24px;}
.side-card li{
  display:flex;
  gap:12px;
  font-size:15px;
  color:var(--text-2);
  line-height:1.75;
}
.side-card li b{
  font-family:Inter,system-ui,sans-serif;
  color:var(--clay);
  font-weight:600;
  font-size:13px;
  letter-spacing:.08em;
  padding-top:3px;
}
.side-card .btn{width:100%;}
@media (max-width:991px){
  .side-card{position:static;}
}

/* ---------- CTA ---------- */
.cta-band{
  background:var(--dark);
  color:#fff;
  border-top:1px solid rgba(255,255,255,.08);
}
.cta-inner{
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,1fr);
  gap:56px;
  align-items:center;
}
@media (max-width:991px){
  .cta-inner{grid-template-columns:1fr;gap:32px;}
}
.cta-inner h2{color:#fff;margin:0 0 16px;}
.cta-inner p{color:rgba(255,255,255,.72);margin:0;max-width:520px;}
.subscribe-form{
  display:flex;
  gap:10px;
  background:rgba(255,255,255,.04);
  border:1px solid rgba(255,255,255,.14);
  border-radius:var(--radius-card);
  padding:12px;
}
.subscribe-form input{
  flex:1;
  min-width:0;
  background:transparent;
  border:1px solid transparent;
  color:#fff;
  font-size:15px;
  padding:12px 14px;
  border-radius:var(--radius-input);
  outline:none;
}
.subscribe-form input::placeholder{color:rgba(255,255,255,.5);}
.subscribe-form input:focus{border-color:var(--clay);background:rgba(255,255,255,.06);}
.cta-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:24px;}
@media (max-width:575px){
  .subscribe-form{flex-direction:column;}
  .subscribe-form .btn{width:100%;}
}

/* ---------- 页脚 ---------- */
.footer{
  background:var(--dark);
  color:rgba(255,255,255,.68);
  padding:72px 0 0;
  font-size:15px;
}
.footer-grid{
  display:grid;
  grid-template-columns:minmax(0,1.5fr) repeat(3,minmax(0,1fr));
  gap:40px;
  padding-bottom:56px;
}
@media (max-width:991px){
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
}
@media (max-width:575px){
  .footer-grid{grid-template-columns:1fr;}
}
.footer-brand{
  display:flex;
  align-items:center;
  gap:10px;
  font-family:"Noto Serif SC","Songti SC",serif;
  font-size:19px;
  color:#fff;
  margin-bottom:16px;
}
.footer p{font-size:14px;line-height:1.85;color:rgba(255,255,255,.6);max-width:340px;margin:0;}
.footer h4{
  color:#fff;
  font-size:15px;
  font-weight:600;
  margin:0 0 18px;
  letter-spacing:.02em;
}
.footer-links{display:flex;flex-direction:column;gap:12px;}
.footer-links a{
  color:rgba(255,255,255,.68);
  font-size:14px;
  display:inline-block;
  transition:color var(--t-mid) var(--ease),transform var(--t-mid) var(--ease);
}
.footer-links a:hover{color:var(--clay-light);transform:translateX(2px);}
.footer-info{display:flex;flex-direction:column;gap:12px;}
.footer-info li{
  display:flex;
  justify-content:space-between;
  gap:14px;
  font-size:14px;
  color:rgba(255,255,255,.68);
  border-bottom:1px solid rgba(255,255,255,.08);
  padding-bottom:10px;
}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.1);
  padding:22px 0 28px;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  font-size:13px;
  color:rgba(255,255,255,.5);
}
.footer-bottom a{color:rgba(255,255,255,.62);}
.footer-bottom a:hover{color:var(--clay-light);}

/* ---------- 返回顶部 ---------- */
.back-top{
  position:fixed;
  right:24px;
  bottom:24px;
  width:44px;height:44px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  border-radius:var(--radius-btn);
  background:var(--ink-teal);
  color:#fff;
  border:0;
  cursor:pointer;
  opacity:0;
  pointer-events:none;
  transform:translateY(8px);
  transition:opacity var(--t-mid) var(--ease),transform var(--t-mid) var(--ease),background-color var(--t-mid) var(--ease);
  z-index:800;
}
.back-top.is-visible{opacity:1;pointer-events:auto;transform:translateY(0);}
.back-top:hover{background:var(--ink-teal-dark);}
@media (max-width:575px){
  .back-top{right:16px;bottom:16px;}
}

/* ---------- 入场动效 ---------- */
.reveal{
  opacity:0;
  transform:translateY(12px);
  transition:opacity var(--t-slow) var(--ease),transform var(--t-slow) var(--ease);
}
.reveal.is-in{opacity:1;transform:none;}

@media (prefers-reduced-motion: reduce){
  *{animation:none !important;transition:none !important;}
  .reveal{opacity:1 !important;transform:none !important;}
  html{scroll-behavior:auto;}
}

/* roulang page: category3 */
:root{
  --bs-primary:#0F3D3E;
  --bs-body-font-family:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --bs-border-radius:10px;
  --bs-link-color:#0F3D3E;
  --bs-link-hover-color:#C75B33;
  --ink:#0F3D3E;
  --ink-deep:#0A2C2D;
  --ink-soft:#1C5C5A;
  --accent:#C75B33;
  --accent-soft:#F2D8CB;
  --bg:#F6F3EE;
  --surface:#FFFFFF;
  --dark:#101413;
  --text:#151A19;
  --muted:#5A635F;
  --faint:#8A918D;
  --border:#E2DCD2;
  --ph:#E9E5DE;
  --r-card:10px;
  --r-btn:6px;
  --r-input:8px;
  --sh-1:0 1px 2px rgba(16,20,19,.05);
  --sh-2:0 12px 32px -12px rgba(16,20,19,.18);
  --ease:cubic-bezier(.22,.61,.36,1);
  --container:1200px;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--bs-body-font-family);
  font-size:17px;
  line-height:1.9;
  font-variant-numeric:tabular-nums;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:var(--ink);text-decoration:none;transition:color .18s var(--ease);}
a:hover{color:var(--accent);}
button{font-family:inherit;}
h1,h2,h3,h4{font-family:"Noto Serif SC","Songti SC",Georgia,serif;color:var(--text);margin:0;font-weight:700;}
h1{font-size:clamp(34px,5vw,60px);line-height:1.12;letter-spacing:-.02em;}
h2{font-size:clamp(26px,3vw,40px);line-height:1.2;letter-spacing:-.01em;}
h3{font-size:clamp(20px,2vw,24px);line-height:1.35;font-weight:600;}
p{margin:0 0 18px;}
p:last-child{margin-bottom:0;}
ul,ol{margin:0;padding:0;list-style:none;}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;}
.container-x{
  width:100%;
  max-width:var(--container);
  margin:0 auto;
  padding-left:24px;
  padding-right:24px;
}
@media (min-width:1400px){:root{--container:1280px;}}

/* ---------- 顶部信息条 ---------- */
.topbar{
  background:var(--ink);
  color:#fff;
  font-size:13px;
  line-height:1.6;
}
.topbar-inner{
  min-height:38px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
}
.topbar-domain{
  letter-spacing:.06em;
  color:rgba(255,255,255,.72);
  font-family:Inter,system-ui,sans-serif;
}
.topbar-note{
  color:rgba(255,255,255,.86);
  text-align:center;
  flex:1 1 auto;
}
.topbar-action{
  color:#fff;
  border-bottom:1px solid rgba(255,255,255,.4);
  padding-bottom:1px;
  white-space:nowrap;
}
.topbar-action:hover{color:var(--accent-soft);border-bottom-color:var(--accent-soft);}

/* ---------- 主导航 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:rgba(255,255,255,.94);
  backdrop-filter:saturate(140%) blur(8px);
  border-bottom:1px solid transparent;
  transition:border-color .32s var(--ease),box-shadow .32s var(--ease);
}
.site-header.is-scrolled{
  border-bottom-color:var(--border);
  box-shadow:var(--sh-1);
}
.header-inner{
  height:72px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:28px;
}
.brand{
  display:flex;
  align-items:baseline;
  gap:8px;
  font-family:"Noto Serif SC","Songti SC",Georgia,serif;
  font-size:20px;
  font-weight:700;
  letter-spacing:-.01em;
  color:var(--text);
  white-space:nowrap;
}
.brand:hover{color:var(--text);}
.brand-mark{
  background:var(--ink);
  color:#fff;
  border-radius:6px;
  padding:3px 8px 4px;
  font-family:Inter,system-ui,sans-serif;
  font-size:16px;
  font-weight:700;
  letter-spacing:.02em;
  display:inline-block;
  line-height:1.2;
}
.brand-text{color:var(--text);}
.brand:hover .brand-text{color:var(--ink-soft);}
.main-nav{
  display:flex;
  align-items:center;
  gap:28px;
  margin:0;
}
.main-nav a{
  position:relative;
  font-size:15px;
  color:var(--muted);
  padding:6px 0;
  font-weight:400;
}
.main-nav a::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:-2px;
  height:2px;
  background:var(--accent);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .32s var(--ease);
}
.main-nav a:hover{color:var(--text);}
.main-nav a:hover::after,
.main-nav a.is-active::after{transform:scaleX(1);}
.main-nav a.is-active{color:var(--text);font-weight:600;}
.header-actions{
  display:flex;
  align-items:center;
  gap:14px;
}
.icon-btn{
  width:40px;height:40px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  border:1px solid var(--border);
  border-radius:var(--r-btn);
  background:#fff;
  color:var(--muted);
  cursor:pointer;
  transition:border-color .18s var(--ease),color .18s var(--ease);
}
.icon-btn:hover{border-color:var(--ink);color:var(--ink);}
.icon-btn svg{width:18px;height:18px;}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  border-radius:var(--r-btn);
  font-size:15px;
  font-weight:500;
  line-height:1;
  padding:13px 22px;
  border:1px solid transparent;
  cursor:pointer;
  transition:transform .18s var(--ease),background-color .18s var(--ease),border-color .18s var(--ease),color .18s var(--ease),box-shadow .18s var(--ease);
}
.btn-primary{
  background:var(--ink);
  color:#fff;
  box-shadow:var(--sh-1);
}
.btn-primary:hover{
  background:var(--ink-deep);
  color:#fff;
  transform:translateY(-1px);
  box-shadow:var(--sh-2);
}
.btn-primary:active{transform:translateY(0);box-shadow:var(--sh-1);}
.btn-ghost{
  background:#fff;
  color:var(--text);
  border-color:var(--border);
}
.btn-ghost:hover{
  border-color:var(--ink);
  color:var(--ink);
  transform:translateY(-1px);
}
.btn-sm{padding:10px 16px;font-size:14px;}
.btn-block{width:100%;}
.btn-link-x{
  display:inline-flex;
  align-items:center;
  gap:6px;
  color:var(--ink);
  font-size:15px;
  padding-bottom:2px;
  position:relative;
}
.btn-link-x::after{
  content:"";
  position:absolute;
  left:0;bottom:0;
  height:1px;width:0;
  background:var(--ink);
  transition:width .32s var(--ease);
}
.btn-link-x:hover::after{width:100%;}

/* ---------- 汉堡与抽屉 ---------- */
.hamburger{
  display:none;
  width:44px;height:44px;
  border:1px solid var(--border);
  border-radius:var(--r-btn);
  background:#fff;
  padding:0;
  cursor:pointer;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:5px;
}
.hamburger span{
  display:block;
  width:18px;height:1.5px;
  background:var(--text);
  transition:transform .32s var(--ease),opacity .18s var(--ease);
}
.hamburger[aria-expanded="true"] span:nth-child(1){transform:translateY(6.5px) rotate(45deg);}
.hamburger[aria-expanded="true"] span:nth-child(2){opacity:0;}
.hamburger[aria-expanded="true"] span:nth-child(3){transform:translateY(-6.5px) rotate(-45deg);}
.drawer{
  position:fixed;
  top:0;right:0;bottom:0;
  width:min(360px,88vw);
  background:#fff;
  border-left:1px solid var(--border);
  box-shadow:-18px 0 48px -24px rgba(16,20,19,.35);
  transform:translateX(100%);
  transition:transform .32s var(--ease);
  z-index:120;
  padding:32px 24px;
  overflow-y:auto;
}
.drawer.is-open{transform:translateX(0);}
.drawer-head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding-bottom:18px;
  border-bottom:1px solid var(--border);
  margin-bottom:22px;
}
.drawer-title{font-size:14px;color:var(--faint);letter-spacing:.08em;}
.drawer-close{
  width:36px;height:36px;
  border:1px solid var(--border);
  border-radius:var(--r-btn);
  background:#fff;
  color:var(--muted);
  cursor:pointer;
  font-size:18px;
  line-height:1;
}
.drawer-close:hover{border-color:var(--ink);color:var(--ink);}
.drawer-nav{display:flex;flex-direction:column;}
.drawer-nav a{
  padding:15px 2px;
  border-bottom:1px solid var(--border);
  font-size:16px;
  color:var(--text);
}
.drawer-nav a.is-active{color:var(--accent);font-weight:600;}
.drawer-cta{margin-top:26px;display:flex;flex-direction:column;gap:12px;}
.drawer-note{
  margin-top:22px;
  font-size:13px;
  color:var(--faint);
  line-height:1.75;
  padding-top:16px;
  border-top:1px solid var(--border);
}
.overlay{
  position:fixed;inset:0;
  background:rgba(16,20,19,.42);
  opacity:0;visibility:hidden;
  transition:opacity .32s var(--ease),visibility .32s var(--ease);
  z-index:110;
}
.overlay.is-open{opacity:1;visibility:visible;}

/* ---------- 页面头部 ---------- */
.page-head{
  padding:56px 0 44px;
  border-bottom:1px solid var(--border);
  position:relative;
}
.page-head::before{
  content:"";
  position:absolute;
  left:24px;top:56px;
  width:56px;height:1px;
  background:var(--accent);
}
.breadcrumb-x{
  display:flex;
  align-items:center;
  gap:10px;
  font-size:13px;
  color:var(--faint);
  margin-bottom:26px;
  flex-wrap:wrap;
}
.breadcrumb-x a{color:var(--muted);}
.breadcrumb-x a:hover{color:var(--ink);}
.breadcrumb-x em{font-style:normal;color:var(--faint);}
.eyebrow{
  display:inline-block;
  font-size:13px;
  letter-spacing:.14em;
  color:var(--accent);
  border:1px solid var(--accent-soft);
  background:#fff;
  border-radius:999px;
  padding:5px 14px;
  margin-bottom:22px;
}
.page-head h1{max-width:900px;}
.lede{
  margin-top:22px;
  max-width:720px;
  font-size:18px;
  line-height:1.85;
  color:var(--muted);
}
.meta-row{
  display:flex;
  flex-wrap:wrap;
  gap:12px 32px;
  margin-top:30px;
  padding-top:22px;
  border-top:1px solid var(--border);
  font-size:14px;
  color:var(--muted);
}
.meta-row li{display:flex;align-items:center;gap:8px;}
.meta-row li::before{
  content:"";
  width:5px;height:5px;
  background:var(--ink);
  transform:rotate(45deg);
  flex:none;
}

/* ---------- 章节标题组件 ---------- */
.sec-head{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  gap:24px;
  margin-bottom:34px;
  flex-wrap:wrap;
}
.sec-head .sec-left{max-width:640px;}
.sec-num{
  display:block;
  font-family:Inter,system-ui,sans-serif;
  font-size:13px;
  letter-spacing:.18em;
  color:var(--accent);
  margin-bottom:10px;
}
.sec-head h2{position:relative;padding-left:18px;}
.sec-head h2::before{
  content:"";
  position:absolute;
  left:0;top:.22em;
  width:3px;height:.86em;
  background:var(--ink);
  transform:scaleY(0);
  transform-origin:top;
  transition:transform .6s var(--ease);
}
.sec-head.is-in h2::before{transform:scaleY(1);}
.sec-sub{
  margin-top:12px;
  padding-left:18px;
  font-size:15px;
  color:var(--muted);
  max-width:640px;
}

/* ---------- FAQ 主体 ---------- */
.faq-section{padding:88px 0 40px;}
.faq-layout{
  display:grid;
  grid-template-columns:minmax(0,1fr) 360px;
  gap:64px;
  align-items:start;
}
.faq-list{
  border-top:1px solid var(--border);
}
.faq-item{
  position:relative;
  border-bottom:1px solid var(--border);
}
.faq-item::before{
  content:"";
  position:absolute;
  left:0;
  top:16px;bottom:16px;
  width:3px;
  background:var(--accent);
  transform:scaleY(0);
  transform-origin:top;
  transition:transform .32s var(--ease);
}
.faq-item[open]::before{transform:scaleY(1);}
.faq-item summary{
  list-style:none;
  cursor:pointer;
  padding:22px 48px 22px 20px;
  font-size:18px;
  font-weight:500;
  line-height:1.55;
  color:var(--text);
  position:relative;
  transition:color .18s var(--ease),padding-left .32s var(--ease);
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary:hover{color:var(--ink);}
.faq-item[open] summary{color:var(--ink);font-weight:600;}
.faq-item summary::after{
  content:"";
  position:absolute;
  right:10px;top:50%;
  width:14px;height:14px;
  margin-top:-7px;
  background:
    linear-gradient(var(--accent),var(--accent)) center/14px 1.5px no-repeat,
    linear-gradient(var(--accent),var(--accent)) center/1.5px 14px no-repeat;
  transition:transform .32s var(--ease);
}
.faq-item[open] summary::after{transform:rotate(90deg);}
.faq-body{
  padding:0 48px 26px 20px;
  font-size:16px;
  line-height:1.9;
  color:var(--muted);
  animation:fadeUp .32s var(--ease) both;
}
.faq-body strong{color:var(--text);font-weight:600;}
@keyframes fadeUp{from{opacity:0;transform:translateY(6px);}to{opacity:1;transform:none;}}

/* ---------- 侧栏速览卡 ---------- */
.faq-side{position:relative;}
.side-card{
  position:sticky;
  top:104px;
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--r-card);
  box-shadow:var(--sh-1);
  padding:24px;
}
.side-card img{
  width:100%;
  aspect-ratio:16/9;
  object-fit:cover;
  border-radius:var(--r-card);
  border:1px solid var(--border);
  margin-bottom:20px;
}
.side-card h3{
  font-size:20px;
  margin-bottom:16px;
  padding-bottom:14px;
  border-bottom:1px solid var(--border);
}
.side-list{display:flex;flex-direction:column;gap:14px;margin-bottom:22px;}
.side-list li{
  display:flex;
  gap:12px;
  font-size:15px;
  line-height:1.75;
  color:var(--muted);
}
.side-list li span:nth-child(1){
  font-family:Inter,system-ui,sans-serif;
  font-size:13px;
  color:var(--accent);
  padding-top:3px;
  flex:none;
}
.side-note{
  margin-top:16px;
  font-size:13px;
  line-height:1.75;
  color:var(--faint);
}
.side-block{
  margin-top:20px;
  background:var(--bg);
  border:1px solid var(--border);
  border-radius:var(--r-card);
  padding:18px 20px;
}
.side-block h4{
  font-size:15px;
  margin-bottom:8px;
  font-family:var(--bs-body-font-family);
  font-weight:600;
}
.side-block p{font-size:14px;color:var(--muted);line-height:1.75;}

/* ---------- 提问前准备（非对称） ---------- */
.prep-section{
  padding:88px 0;
  background:var(--surface);
  border-top:1px solid var(--border);
  border-bottom:1px solid var(--border);
}
.prep-grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:28px;
  margin-top:8px;
}
.prep-card{
  background:var(--bg);
  border:1px solid var(--border);
  border-radius:var(--r-card);
  padding:30px 26px 28px;
  transition:transform .32s var(--ease),box-shadow .32s var(--ease),border-color .32s var(--ease);
}
.prep-card:nth-child(2){margin-top:34px;}
.prep-card:nth-child(3){margin-top:68px;}
.prep-card:hover{
  transform:translateY(-2px);
  border-color:var(--ink);
  box-shadow:var(--sh-2);
}
.prep-card:hover:nth-child(2){transform:translateY(32px);}
.prep-card:hover:nth-child(3){transform:translateY(66px);}
.prep-num{
  font-family:Inter,system-ui,sans-serif;
  font-size:13px;
  letter-spacing:.16em;
  color:var(--accent);
  display:block;
  margin-bottom:16px;
}
.prep-card h3{font-size:21px;margin-bottom:12px;}
.prep-card p{font-size:15px;line-height:1.85;color:var(--muted);}

/* ---------- 处理路径 ---------- */
.flow-section{padding:88px 0;}
.flow-layout{
  display:grid;
  grid-template-columns:minmax(0,1.02fr) minmax(0,.98fr);
  gap:56px;
  align-items:center;
}
.flow-figure{
  position:relative;
  border-radius:var(--r-card);
  overflow:hidden;
  border:1px solid var(--border);
  box-shadow:var(--sh-1);
}
.flow-figure img{
  width:100%;
  aspect-ratio:4/3;
  object-fit:cover;
  transition:transform .6s var(--ease);
}
.flow-figure:hover img{transform:scale(1.03);}
.flow-figure figcaption{
  position:absolute;
  left:0;right:0;bottom:0;
  padding:14px 18px;
  font-size:13px;
  color:#fff;
  background:linear-gradient(180deg,rgba(16,20,19,0),rgba(16,20,19,.72));
}
.flow-steps{
  position:relative;
  padding-left:26px;
  margin-top:28px;
}
.flow-steps::before{
  content:"";
  position:absolute;
  left:5px;top:8px;bottom:8px;
  width:1px;
  background:var(--border);
}
.flow-step{
  position:relative;
  padding-bottom:26px;
}
.flow-step:last-child{padding-bottom:0;}
.flow-step::before{
  content:"";
  position:absolute;
  left:-26px;top:8px;
  width:11px;height:11px;
  background:#fff;
  border:2px solid var(--ink);
  transform:rotate(45deg);
}
.flow-step h3{
  font-size:18px;
  margin-bottom:8px;
  display:flex;
  align-items:baseline;
  gap:10px;
}
.flow-step h3 span{
  font-family:Inter,system-ui,sans-serif;
  font-size:13px;
  color:var(--accent);
  letter-spacing:.12em;
}
.flow-step p{font-size:15px;color:var(--muted);line-height:1.85;}

/* ---------- 反馈表单 ---------- */
.feedback-section{
  padding:72px 0;
  background:var(--surface);
  border-top:1px solid var(--border);
  border-bottom:1px solid var(--border);
}
.feedback-inner{
  display:grid;
  grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);
  gap:48px;
  align-items:center;
}
.feedback-inner h2{font-size:clamp(24px,2.4vw,32px);}
.feedback-inner p{margin-top:14px;font-size:16px;color:var(--muted);}
.form-bar{
  display:flex;
  gap:12px;
  align-items:stretch;
}
.form-bar input{
  flex:1 1 auto;
  min-width:0;
  height:52px;
  padding:0 16px;
  font-size:15px;
  color:var(--text);
  background:#fff;
  border:1px solid var(--border);
  border-radius:var(--r-input);
  transition:border-color .18s var(--ease),box-shadow .18s var(--ease);
}
.form-bar input::placeholder{color:var(--faint);}
.form-bar input:focus{
  outline:none;
  border-color:var(--ink);
  box-shadow:0 0 0 2px var(--accent-soft);
}
.form-bar .btn{height:52px;padding:0 26px;flex:none;}
.form-hint{
  margin-top:14px;
  font-size:13px;
  color:var(--faint);
}
.form-status{
  margin-top:12px;
  font-size:14px;
  color:var(--ink);
  min-height:20px;
}

/* ---------- CTA 条 ---------- */
.cta-band{
  background:var(--dark);
  color:#fff;
  padding:72px 0;
}
.cta-band-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:36px;
  flex-wrap:wrap;
}
.cta-band h2{color:#fff;font-size:clamp(24px,2.6vw,34px);}
.cta-band p{
  margin-top:12px;
  color:rgba(255,255,255,.72);
  font-size:16px;
  max-width:560px;
}
.cta-actions{display:flex;gap:14px;flex-wrap:wrap;}
.btn-outline-light-x{
  background:transparent;
  color:#fff;
  border-color:rgba(255,255,255,.4);
}
.btn-outline-light-x:hover{
  color:#fff;
  border-color:#fff;
  background:rgba(255,255,255,.06);
  transform:translateY(-1px);
}
.btn-accent{
  background:var(--accent);
  color:#fff;
}
.btn-accent:hover{
  background:#b04d29;
  color:#fff;
  transform:translateY(-1px);
  box-shadow:0 12px 32px -14px rgba(0,0,0,.6);
}

/* ---------- 页脚 ---------- */
.footer{
  background:var(--dark);
  color:rgba(255,255,255,.72);
  padding:72px 0 28px;
  font-size:15px;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.4fr 1fr 1fr 1.1fr;
  gap:40px;
  padding-bottom:44px;
  border-bottom:1px solid rgba(255,255,255,.12);
}
.footer-brand{
  display:flex;
  align-items:baseline;
  gap:8px;
  font-family:"Noto Serif SC","Songti SC",Georgia,serif;
  font-size:19px;
  font-weight:700;
  color:#fff;
  margin-bottom:18px;
}
.footer-brand .brand-mark{background:var(--accent);}
.footer p{font-size:14px;line-height:1.85;color:rgba(255,255,255,.62);max-width:340px;}
.footer h4{
  font-size:14px;
  color:#fff;
  letter-spacing:.08em;
  margin-bottom:18px;
  font-family:var(--bs-body-font-family);
  font-weight:600;
}
.footer-links{display:flex;flex-direction:column;gap:12px;}
.footer-links a{
  color:rgba(255,255,255,.66);
  font-size:14px;
  transition:color .18s var(--ease),transform .18s var(--ease);
  align-self:flex-start;
}
.footer-links a:hover{color:var(--accent-soft);transform:translateX(2px);}
.footer-info{display:flex;flex-direction:column;gap:12px;}
.footer-info li{
  display:flex;
  justify-content:space-between;
  gap:14px;
  font-size:14px;
  color:rgba(255,255,255,.6);
  border-bottom:1px dashed rgba(255,255,255,.12);
  padding-bottom:10px;
}
.footer-info li span:last-child{color:rgba(255,255,255,.86);}
.footer-bottom{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px;
  padding-top:24px;
  font-size:13px;
  color:rgba(255,255,255,.5);
  flex-wrap:wrap;
}
.footer-bottom a{color:rgba(255,255,255,.7);}
.footer-bottom a:hover{color:var(--accent-soft);}

/* ---------- 返回顶部 ---------- */
.to-top{
  position:fixed;
  right:20px;bottom:20px;
  width:44px;height:44px;
  border-radius:var(--r-btn);
  border:1px solid var(--border);
  background:#fff;
  color:var(--ink);
  display:flex;
  align-items:center;
  justify-content:center;
  cursor:pointer;
  box-shadow:var(--sh-2);
  opacity:0;
  visibility:hidden;
  transform:translateY(8px);
  transition:opacity .32s var(--ease),visibility .32s var(--ease),transform .32s var(--ease);
  z-index:90;
}
.to-top.is-show{opacity:1;visibility:visible;transform:none;}
.to-top svg{width:16px;height:16px;}

/* ---------- 入场动效 ---------- */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .6s var(--ease),transform .6s var(--ease);}
.reveal.is-in{opacity:1;transform:none;}

/* ---------- 响应式 ---------- */
@media (max-width:1200px){
  .faq-layout{grid-template-columns:minmax(0,1fr) 320px;gap:44px;}
  .flow-layout{gap:40px;}
}
@media (max-width:991px){
  .main-nav{display:none;}
  .hamburger{display:flex;}
  .header-actions .btn{display:none;}
  .topbar-note{display:none;}
  .faq-layout{grid-template-columns:minmax(0,1fr);gap:40px;}
  .side-card{position:static;}
  .faq-section{padding:64px 0 32px;}
  .prep-section,.flow-section{padding:64px 0;}
  .prep-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:22px;}
  .prep-card:nth-child(2),
  .prep-card:nth-child(3){margin-top:0;}
  .prep-card:hover:nth-child(2),
  .prep-card:hover:nth-child(3){transform:translateY(-2px);}
  .flow-layout{grid-template-columns:minmax(0,1fr);}
  .feedback-inner{grid-template-columns:minmax(0,1fr);gap:32px;}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:34px;}
}
@media (max-width:767px){
  body{font-size:16px;}
  .container-x{padding-left:16px;padding-right:16px;}
  .page-head{padding:40px 0 32px;}
  .page-head::before{left:16px;top:40px;width:40px;}
  .faq-item summary{padding:18px 42px 18px 16px;font-size:17px;}
  .faq-body{padding:0 16px 22px 16px;font-size:15px;}
  .faq-section{padding:48px 0 24px;}
  .prep-section,.flow-section{padding:48px 0;}
  .prep-grid{grid-template-columns:minmax(0,1fr);}
  .form-bar{flex-direction:column;}
  .form-bar .btn{width:100%;}
  .cta-band{padding:52px 0;}
  .footer{padding:52px 0 24px;}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:30px;}
  .footer-bottom{flex-direction:column;align-items:flex-start;}
  .side-card{padding:20px;}
  .sec-head h2{padding-left:14px;}
  .sec-sub{padding-left:14px;}
}
@media (max-width:519px){
  .topbar-inner{gap:12px;}
  .topbar-action{font-size:12px;}
  .brand{font-size:18px;}
  h1{font-size:clamp(28px,7vw,34px);}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms !important;
    transition-duration:.001ms !important;
  }
  .reveal{opacity:1;transform:none;}
}

/* roulang page: category4 */
:root{
  --primary:#0F3D3E;
  --primary-d:#0A2C2D;
  --primary-l:#1C5C5A;
  --accent:#C75B33;
  --accent-l:#F2D8CB;
  --bg:#F6F3EE;
  --surface:#FFFFFF;
  --dark:#101413;
  --ink:#151A19;
  --ink-2:#5A635F;
  --ink-3:#8A918D;
  --line:#E2DCD2;
  --ph:#E9E5DE;
  --r-card:10px;
  --r-btn:6px;
  --r-input:8px;
  --r-pill:999px;
  --sh-1:0 1px 2px rgba(16,20,19,.05);
  --sh-2:0 12px 32px -12px rgba(16,20,19,.18);
  --ease:cubic-bezier(.22,.61,.36,1);
  --bs-primary:#0F3D3E;
  --bs-body-color:#151A19;
  --bs-body-bg:#F6F3EE;
  --bs-body-font-family:"Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --bs-font-sans-serif:"Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --bs-border-color:#E2DCD2;
  --bs-border-radius:10px;
  --bs-link-color:#0F3D3E;
  --bs-link-hover-color:#0A2C2D;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:"Noto Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:17px;line-height:1.9;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5{font-family:"Noto Serif SC",Georgia,"Songti SC",serif;font-weight:700;margin:0;line-height:1.25;letter-spacing:-.01em}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none;transition:color 180ms var(--ease)}
button,input{font-family:inherit;font-size:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.num{font-family:"Inter",system-ui,sans-serif;font-weight:600;letter-spacing:-.01em}

/* Bootstrap 默认外观覆盖 */
.btn{--bs-btn-border-radius:6px}
.btn-primary{
  --bs-btn-bg:#0F3D3E;--bs-btn-border-color:#0F3D3E;
  --bs-btn-hover-bg:#0A2C2D;--bs-btn-hover-border-color:#0A2C2D;
  --bs-btn-active-bg:#0A2C2D;--bs-btn-active-border-color:#0A2C2D;
}
.card{--bs-card-border-color:#E2DCD2;--bs-card-border-radius:10px;--bs-card-box-shadow:none}
.accordion{--bs-accordion-border-color:#E2DCD2;--bs-accordion-btn-focus-box-shadow:none}

.container-x{
  width:100%;max-width:1200px;margin:0 auto;padding:0 24px;
}
@media (min-width:1400px){.container-x{max-width:1280px}}
@media (max-width:575.98px){.container-x{padding:0 16px}}

/* ---------- 顶部信息条 ---------- */
.info-bar{
  background:var(--primary);color:rgba(255,255,255,.92);
  height:38px;display:flex;align-items:center;font-size:13px;letter-spacing:.01em;
}
.info-inner{
  display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:16px;width:100%;
}
.info-domain{display:inline-flex;align-items:center;gap:8px;color:rgba(255,255,255,.72)}
.info-domain i{font-size:11px;color:var(--accent-l)}
.info-note{text-align:center;color:rgba(255,255,255,.86)}
.info-right{justify-self:end}
.info-link{
  color:#fff;border-bottom:1px solid rgba(255,255,255,.35);padding-bottom:1px;
  transition:border-color 180ms var(--ease),color 180ms var(--ease);
}
.info-link:hover{border-color:var(--accent-l);color:var(--accent-l)}
@media (max-width:767.98px){
  .info-domain,.info-note{display:none}
  .info-inner{grid-template-columns:1fr;justify-items:end}
}

/* ---------- 导航 ---------- */
.site-header{position:relative;z-index:60}
.nav-shell{
  position:sticky;top:0;background:rgba(255,255,255,.96);
  backdrop-filter:saturate(150%) blur(6px);
  border-bottom:1px solid transparent;
  transition:border-color 320ms var(--ease),box-shadow 320ms var(--ease);
}
.nav-shell.is-scrolled{border-bottom-color:var(--line);box-shadow:0 1px 2px rgba(16,20,19,.05)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;height:72px}
.logo{display:inline-flex;align-items:baseline;gap:2px;font-family:"Noto Serif SC",serif;font-size:21px;font-weight:700;letter-spacing:-.01em;color:var(--ink);white-space:nowrap}
.logo .brand-mark{
  color:var(--primary);letter-spacing:.02em;
  border-bottom:2px solid var(--accent);padding-bottom:2px;
}
.logo .brand-text{color:var(--ink);padding-left:2px}
.main-nav{display:flex;align-items:center;gap:28px}
.main-nav a{
  position:relative;font-size:15px;color:var(--ink-2);padding:26px 0;white-space:nowrap;
  transition:color 180ms var(--ease);
}
.main-nav a::after{
  content:"";position:absolute;left:0;right:0;bottom:16px;height:2px;background:var(--accent);
  transform:scaleX(0);transform-origin:left;transition:transform 320ms var(--ease);
}
.main-nav a:hover{color:var(--ink)}
.main-nav a:hover::after{transform:scaleX(1)}
.main-nav a.is-active{color:var(--ink);font-weight:600}
.main-nav a.is-active::after{transform:scaleX(1)}
.nav-actions{display:flex;align-items:center;gap:12px}
.icon-btn{
  width:40px;height:40px;display:inline-flex;align-items:center;justify-content:center;
  border:1px solid var(--line);border-radius:var(--r-btn);background:#fff;color:var(--ink-2);
  cursor:pointer;transition:all 180ms var(--ease);
}
.icon-btn:hover{border-color:var(--primary);color:var(--primary)}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:var(--r-btn);border:1px solid transparent;
  font-size:15px;font-weight:500;line-height:1;cursor:pointer;
  transition:background 180ms var(--ease),color 180ms var(--ease),border-color 180ms var(--ease),transform 180ms var(--ease),box-shadow 180ms var(--ease);
}
.btn-primary{background:var(--primary);color:#fff;border-color:var(--primary)}
.btn-primary:hover{background:var(--primary-d);border-color:var(--primary-d);color:#fff;transform:translateY(-1px);box-shadow:var(--sh-2)}
.btn-primary:active{transform:translateY(0);box-shadow:none}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--primary);color:var(--primary)}
.btn-sm{padding:10px 18px;font-size:14px}
.btn-lg{padding:15px 28px;font-size:16px}
.link-arrow{
  display:inline-flex;align-items:center;gap:6px;font-size:14px;color:var(--primary);
  border-bottom:1px solid transparent;transition:border-color 320ms var(--ease),gap 180ms var(--ease);
}
.link-arrow:hover{border-bottom-color:var(--primary);gap:10px}
.hamburger{
  display:none;width:44px;height:44px;border:1px solid var(--line);border-radius:var(--r-btn);
  background:#fff;cursor:pointer;position:relative;
}
.hamburger span{
  position:absolute;left:12px;right:12px;height:1.5px;background:var(--ink);
  transition:transform 320ms var(--ease),opacity 180ms var(--ease);
}
.hamburger span:nth-child(1){top:16px}
.hamburger span:nth-child(2){top:21px}
.hamburger span:nth-child(3){top:26px}
.drawer{
  position:fixed;top:0;right:0;width:320px;max-width:88vw;height:100%;
  background:var(--surface);border-left:1px solid var(--line);
  transform:translateX(102%);transition:transform 320ms var(--ease);z-index:80;
  padding:24px;overflow-y:auto;
}
.drawer-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px}
.drawer-title{font-family:"Noto Serif SC",serif;font-size:18px;font-weight:700}
.drawer a.drawer-link{
  display:block;padding:14px 0;border-bottom:1px solid var(--line);font-size:15px;color:var(--ink-2);
}
.drawer a.drawer-link:hover{color:var(--primary)}
.drawer .btn{width:100%;margin-top:24px}
.drawer-note{margin-top:20px;font-size:13px;color:var(--ink-3);line-height:1.75}
.drawer-mask{
  position:fixed;inset:0;background:rgba(16,20,19,.35);opacity:0;pointer-events:none;
  transition:opacity 320ms var(--ease);z-index:70;
}
body.drawer-open .drawer{transform:translateX(0)}
body.drawer-open .drawer-mask{opacity:1;pointer-events:auto}
body.drawer-open{overflow:hidden}
@media (max-width:991.98px){
  .main-nav{display:none}
  .hamburger{display:inline-block}
  .nav-actions .btn-sm{display:none}
}

/* ---------- 面包屑 ---------- */
.crumb{padding:28px 0 0;font-size:13.5px;color:var(--ink-3)}
.crumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:10px}
.crumb li{display:flex;align-items:center;gap:10px}
.crumb li+li::before{content:"/";color:var(--line);font-size:12px}
.crumb a:hover{color:var(--primary)}
.crumb .current{color:var(--ink-2)}

/* ---------- 通用板块头 ---------- */
section{position:relative}
.sec{padding:96px 0}
.sec-tight{padding:72px 0}
@media (max-width:991.98px){.sec{padding:72px 0}.sec-tight{padding:56px 0}}
@media (max-width:575.98px){.sec{padding:48px 0}.sec-tight{padding:44px 0}}
.sec-head{
  display:flex;align-items:flex-end;justify-content:space-between;gap:32px;
  padding-bottom:24px;margin-bottom:40px;border-bottom:1px solid var(--line);
}
.sec-head-left{display:flex;gap:18px;align-items:flex-start}
.sec-no{
  font-family:"Inter",sans-serif;font-size:13px;letter-spacing:.16em;color:var(--accent);
  padding-top:10px;white-space:nowrap;
}
.sec-head h2{font-size:clamp(26px,3vw,40px);line-height:1.2}
.sec-sub{margin-top:10px;font-size:15px;color:var(--ink-2);line-height:1.75;max-width:560px}
@media (max-width:767.98px){
  .sec-head{flex-direction:column;align-items:flex-start;gap:16px}
}

/* ---------- 分类头部 ---------- */
.cat-hero{padding:36px 0 0}
.cat-hero-grid{
  display:grid;grid-template-columns:1.15fr .85fr;gap:56px;align-items:center;
  padding-bottom:64px;
}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;font-size:13px;letter-spacing:.14em;
  color:var(--accent);text-transform:uppercase;
}
.eyebrow::before{content:"";width:28px;height:1px;background:var(--accent);display:inline-block}
.cat-hero h1{
  font-size:clamp(34px,5vw,60px);line-height:1.12;letter-spacing:-.02em;margin:20px 0 0;
}
.cat-lead{margin-top:20px;font-size:17px;color:var(--ink-2);line-height:1.9;max-width:680px}
.cat-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:32px}
.hero-marks{display:flex;gap:10px;margin-top:36px;flex-wrap:wrap}
.hero-mark{
  display:inline-flex;align-items:center;gap:8px;font-size:13px;color:var(--ink-2);
  background:#fff;border:1px solid var(--line);border-radius:var(--r-pill);padding:7px 14px;
}
.hero-mark i{color:var(--accent);font-size:11px}
.hero-media{position:relative}
.hero-media img{
  width:100%;aspect-ratio:1/1;object-fit:cover;border-radius:var(--r-card);
  border:1px solid var(--line);box-shadow:var(--sh-1);
}
.hero-media::before{
  content:"";position:absolute;top:-12px;left:-12px;width:44px;height:44px;
  border-top:1px solid var(--primary);border-left:1px solid var(--primary);
}
.hero-media::after{
  content:"";position:absolute;bottom:-12px;right:-12px;width:44px;height:44px;
  border-bottom:1px solid var(--primary);border-right:1px solid var(--primary);
}
.media-cap{
  position:absolute;left:16px;bottom:16px;background:rgba(255,255,255,.94);
  border:1px solid var(--line);border-radius:var(--r-pill);padding:6px 14px;font-size:13px;color:var(--ink-2);
}
@media (max-width:991.98px){
  .cat-hero-grid{grid-template-columns:1fr;gap:36px;padding-bottom:44px}
  .hero-media img{aspect-ratio:16/10}
}

/* ---------- 指标条 ---------- */
.metrics{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  display:grid;grid-template-columns:repeat(4,1fr);overflow:hidden;box-shadow:var(--sh-1);
}
.metric{padding:32px 28px;border-right:1px solid var(--line)}
.metric:last-child{border-right:0}
.metric .value{
  font-family:"Noto Serif SC",serif;font-size:clamp(30px,3.4vw,42px);line-height:1;color:var(--primary);
}
.metric .value small{font-size:15px;color:var(--ink-3);margin-left:4px;font-family:"Noto Sans SC",sans-serif}
.metric .label{margin-top:12px;font-size:14px;color:var(--ink-2);line-height:1.7}
@media (max-width:767.98px){
  .metrics{grid-template-columns:repeat(2,1fr)}
  .metric:nth-child(2){border-right:0}
  .metric:nth-child(1),.metric:nth-child(2){border-bottom:1px solid var(--line)}
  .metric{padding:24px 20px}
}

/* ---------- 图文交错 ---------- */
.split{
  display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center;
  padding:56px 0;
}
.split+.split{border-top:1px solid var(--line)}
.split-media img{
  width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:var(--r-card);border:1px solid var(--line);
  box-shadow:var(--sh-1);
}
.split-body .kicker{
  font-family:"Inter",sans-serif;font-size:13px;letter-spacing:.16em;color:var(--accent);
}
.split-body h3{font-size:clamp(20px,2.4vw,26px);margin:14px 0 16px;line-height:1.35}
.split-body p{font-size:16px;color:var(--ink-2);line-height:1.95;max-width:560px}
.split-list{margin-top:22px;display:grid;gap:12px}
.split-list li{display:flex;gap:12px;font-size:15px;color:var(--ink-2);line-height:1.8}
.split-list i{color:var(--primary);font-size:12px;margin-top:8px}
.split.reverse .split-media{order:2}
@media (max-width:991.98px){
  .split{grid-template-columns:1fr;gap:28px;padding:40px 0}
  .split.reverse .split-media{order:0}
}

/* ---------- 速查表 ---------- */
.q-wrap{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  overflow:hidden;box-shadow:var(--sh-1);
}
table.q-table{width:100%;border-collapse:collapse;font-size:15px}
.q-table thead th{
  text-align:left;font-family:"Noto Sans SC",sans-serif;font-weight:500;font-size:13px;
  letter-spacing:.1em;color:var(--ink-3);background:#FBFAF7;padding:16px 24px;
  border-bottom:1px solid var(--line);white-space:nowrap;
}
.q-table tbody tr{border-bottom:1px solid var(--line);transition:background 180ms var(--ease)}
.q-table tbody tr:last-child{border-bottom:0}
.q-table tbody tr:nth-child(even){background:#FCFBF9}
.q-table tbody tr:hover{background:#F6F3EE}
.q-table td,.q-table th[scope="row"]{
  padding:22px 24px;vertical-align:top;line-height:1.8;color:var(--ink-2);
  border-right:1px solid var(--line);font-weight:400;font-family:"Noto Sans SC",sans-serif;
}
.q-table td:last-child,.q-table th[scope="row"]:last-child{border-right:0}
.q-table th[scope="row"]{
  width:26%;color:var(--ink);font-weight:500;font-size:15.5px;
}
.q-table td:nth-child(2){width:34%}
.q-tag{
  display:inline-block;margin-left:8px;font-size:12px;color:var(--primary);
  background:#EDF3F2;border-radius:var(--r-pill);padding:2px 10px;vertical-align:2px;
}
@media (max-width:767.98px){
  .q-wrap{background:transparent;border:0;box-shadow:none;border-radius:0;overflow:visible}
  .q-table,.q-table tbody,.q-table tr,.q-table td,.q-table th{display:block;width:auto}
  .q-table thead{display:none}
  .q-table tbody tr{
    background:#fff!important;border:1px solid var(--line);border-radius:var(--r-card);
    padding:20px;margin-bottom:16px;box-shadow:var(--sh-1);
  }
  .q-table td,.q-table th[scope="row"]{border-right:0;padding:0 0 14px}
  .q-table th[scope="row"]:last-child,.q-table td:last-child{padding-bottom:0}
  .q-table td::before,.q-table th[scope="row"]::before{
    content:attr(data-label);display:block;font-size:12px;letter-spacing:.1em;
    color:var(--ink-3);margin-bottom:6px;
  }
  .q-table th[scope="row"]{font-weight:600}
}

/* ---------- 分类导航卡 ---------- */
.cat-grid{display:grid;grid-template-columns:1.4fr 1fr;gap:24px;align-items:start}
.cat-main{
  position:relative;display:block;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-card);overflow:hidden;box-shadow:var(--sh-1);
  transition:transform 320ms var(--ease),box-shadow 320ms var(--ease);
}
.cat-main:hover{transform:translateY(-2px);box-shadow:var(--sh-2)}
.cat-main img{width:100%;aspect-ratio:16/10;object-fit:cover;transition:transform 600ms var(--ease)}
.cat-main:hover img{transform:scale(1.03)}
.cat-main-body{padding:26px 28px 30px}
.cat-main-body h3{font-size:22px;margin:12px 0 10px}
.cat-main-body p{font-size:15px;color:var(--ink-2);line-height:1.85}
.chip{
  display:inline-block;font-size:12px;color:var(--primary);background:#EDF3F2;
  border-radius:var(--r-pill);padding:5px 12px;letter-spacing:.02em;
}
.cat-side{display:grid;gap:24px}
.cat-item{
  display:flex;align-items:center;gap:18px;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-card);padding:22px 24px;box-shadow:var(--sh-1);
  transition:transform 320ms var(--ease),box-shadow 320ms var(--ease),border-color 320ms var(--ease);
}
.cat-item:hover{transform:translateY(-2px);box-shadow:var(--sh-2);border-color:var(--primary)}
.cat-item .idx{
  font-family:"Inter",sans-serif;font-size:13px;letter-spacing:.12em;color:var(--accent);min-width:28px;
}
.cat-item-body h4{font-size:17px;margin-bottom:6px}
.cat-item-body p{font-size:14px;color:var(--ink-3);line-height:1.7}
.cat-item i.arrow{margin-left:auto;color:var(--ink-3);transition:transform 180ms var(--ease),color 180ms var(--ease)}
.cat-item:hover i.arrow{transform:translateX(4px);color:var(--accent)}
@media (max-width:991.98px){
  .cat-grid{grid-template-columns:1fr}
}

/* ---------- CTA 条 ---------- */
.cta-band{
  position:relative;background:var(--dark);color:#fff;border-radius:var(--r-card);
  overflow:hidden;padding:64px 56px;display:grid;grid-template-columns:1.1fr 1fr;
  gap:48px;align-items:center;
}
.cta-band::before{
  content:"";position:absolute;inset:0;
  background-image:url('/assets/images/backpic/back-2.webp');
  background-size:cover;background-position:center;opacity:.22;
}
.cta-band>*{position:relative;z-index:2}
.cta-band h2{font-size:clamp(24px,2.8vw,34px);color:#fff}
.cta-band p{margin-top:14px;font-size:15.5px;color:rgba(255,255,255,.76);line-height:1.9;max-width:520px}
.cta-form{display:flex;gap:12px}
.cta-form input{
  flex:1;height:50px;border-radius:var(--r-input);border:1px solid rgba(255,255,255,.24);
  background:rgba(255,255,255,.08);color:#fff;padding:0 16px;font-size:15px;
  transition:border-color 180ms var(--ease),box-shadow 180ms var(--ease),background 180ms var(--ease);
}
.cta-form input::placeholder{color:rgba(255,255,255,.5)}
.cta-form input:focus{
  outline:none;border-color:#fff;background:rgba(255,255,255,.12);
  box-shadow:0 0 0 2px rgba(199,91,51,.6);
}
.cta-form .btn{background:var(--accent);border-color:var(--accent);color:#fff;height:50px;padding:0 26px}
.cta-form .btn:hover{background:#B14E2A;border-color:#B14E2A;transform:translateY(-1px);box-shadow:none}
.cta-note{margin-top:14px;font-size:13px;color:rgba(255,255,255,.55)}
@media (max-width:991.98px){
  .cta-band{grid-template-columns:1fr;gap:28px;padding:44px 28px}
}
@media (max-width:575.98px){
  .cta-band{padding:36px 20px}
  .cta-form{flex-direction:column}
  .cta-form .btn{width:100%}
}

/* ---------- 页脚 ---------- */
.footer{background:var(--dark);color:rgba(255,255,255,.72);padding:72px 0 0;margin-top:96px}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px;padding-bottom:56px}
.footer-brand{
  display:flex;align-items:baseline;gap:8px;font-family:"Noto Serif SC",serif;
  font-size:20px;font-weight:700;color:#fff;margin-bottom:16px;
}
.footer-brand .brand-mark{
  color:var(--accent-l);border-bottom:2px solid var(--accent);padding-bottom:2px;letter-spacing:.02em;
}
.footer p{font-size:14px;line-height:1.85;color:rgba(255,255,255,.6);max-width:320px}
.footer h4{font-size:15px;color:#fff;margin-bottom:18px;font-family:"Noto Sans SC",sans-serif;font-weight:500;letter-spacing:.02em}
.footer-links{display:grid;gap:12px}
.footer-links a{
  font-size:14px;color:rgba(255,255,255,.68);display:inline-block;
  transition:color 180ms var(--ease),transform 180ms var(--ease);
}
.footer-links a:hover{color:var(--accent-l);transform:translateX(2px)}
.footer-info{display:grid;gap:12px}
.footer-info li{display:flex;justify-content:space-between;gap:16px;font-size:14px;border-bottom:1px solid rgba(255,255,255,.08);padding-bottom:10px}
.footer-info li span:last-child{color:#fff}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.1);padding:22px 0 28px;display:flex;
  justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13px;color:rgba(255,255,255,.5);
}
.footer-bottom a{color:rgba(255,255,255,.7);border-bottom:1px solid rgba(255,255,255,.25)}
.footer-bottom a:hover{color:var(--accent-l);border-color:var(--accent-l)}
@media (max-width:991.98px){
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
}
@media (max-width:575.98px){
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer{padding-top:52px;margin-top:64px}
}

/* ---------- 返回顶部 ---------- */
.to-top{
  position:fixed;right:24px;bottom:24px;width:44px;height:44px;border-radius:var(--r-btn);
  border:1px solid var(--line);background:#fff;color:var(--primary);display:inline-flex;
  align-items:center;justify-content:center;box-shadow:var(--sh-2);cursor:pointer;
  opacity:0;visibility:hidden;transform:translateY(8px);z-index:65;
  transition:opacity 320ms var(--ease),transform 320ms var(--ease),visibility 320ms;
}
.to-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{background:var(--primary);color:#fff;border-color:var(--primary)}

/* ---------- 入场动效 ---------- */
.reveal{opacity:0;transform:translateY(12px);transition:opacity 600ms var(--ease),transform 600ms var(--ease)}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}
  .reveal{opacity:1;transform:none}
}