/* roulang page: index */
:root{
  --pine:#0F3A32;
  --pine-deep:#0B2A24;
  --clay:#C4643C;
  --sand:#F7F4EE;
  --sand-deep:#EFEAE0;
  --card:#FFFDF9;
  --line:#E1DACD;
  --ink:#22262A;
  --ink-soft:#4A504C;
  --muted:#6E736F;
  --radius-card:6px;
  --radius-btn:4px;
  --shadow-hover:0 12px 32px rgba(15,58,50,.08);
  --ease:cubic-bezier(.2,.8,.2,1);
  --font-sans:"HarmonyOS Sans SC","PingFang SC","Source Han Sans SC","Noto Sans SC",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,Menlo,monospace;
}
*,*::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:16px;line-height:1.85;
  color:var(--ink-soft);background:var(--sand);-webkit-font-smoothing:antialiased;
}
body.no-scroll{overflow:hidden}
h1,h2,h3,h4{margin:0;color:var(--ink);font-weight:700;letter-spacing:-.01em}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
input,textarea{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--clay);outline-offset:2px;border-radius:2px}
::selection{background:var(--pine);color:var(--sand)}
.container{width:100%;max-width:1240px;margin:0 auto;padding:0 48px}
.section{padding:112px 0}
.section-tight{padding:80px 0}
.bg-alt{background:var(--sand-deep)}
.eyebrow{
  display:inline-block;font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;
  color:var(--clay);text-transform:uppercase;
}
.section-head{max-width:720px}
.section-head h2{font-size:clamp(1.75rem,2.8vw,2.6rem);line-height:1.2;letter-spacing:-.01em;margin-top:14px}
.section-head p{margin-top:16px;color:var(--ink-soft);font-size:16.5px}
.divider{height:1px;background:var(--line);border:0;margin:0}

/* ============ 导航 ============ */
.site-header{
  position:sticky;top:0;z-index:70;background:rgba(247,244,238,.97);
  border-bottom:1px solid var(--line);
  transition:background .2s var(--ease),border-color .2s var(--ease);
}
.site-header.is-scrolled{background:#F4F0E8;border-bottom-color:#D3C9B6}
.nav-wrap{height:72px;display:flex;align-items:center;justify-content:space-between;gap:32px;transition:height .2s var(--ease)}
.site-header.is-scrolled .nav-wrap{height:60px}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0}
.brand-mark{
  font-family:var(--font-mono);font-size:19px;font-weight:700;letter-spacing:.08em;
  color:var(--pine);line-height:1;
}
.brand-sub{
  font-size:12px;letter-spacing:.14em;color:var(--muted);line-height:1;
  padding-left:10px;border-left:1px solid var(--line);
}
.nav-links{display:flex;align-items:center;gap:34px}
.nav-link{
  position:relative;display:inline-block;font-size:15px;color:var(--ink-soft);
  padding:6px 0;transition:color .2s var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:-4px;height:2px;background:var(--clay);
  transform:scaleX(0);transform-origin:left;transition:transform .2s var(--ease);
}
.nav-link:hover{color:var(--pine)}
.nav-link:hover::after,.nav-link.is-active::after{transform:scaleX(1)}
.nav-link.is-active{color:var(--ink);font-weight:600}
.nav-right{display:flex;align-items:center;gap:18px;flex-shrink:0}
.nav-toggle{
  display:none;position:relative;width:44px;height:44px;align-items:center;justify-content:center;
  border-radius:4px;
}
.nav-toggle span{position:absolute;left:11px;width:22px;height:1.5px;background:var(--ink);transition:transform .2s var(--ease),top .2s var(--ease)}
.nav-toggle span:nth-child(1){top:18px}
.nav-toggle span:nth-child(2){top:25px}
.nav-toggle.is-open span:nth-child(1){top:21px;transform:rotate(45deg)}
.nav-toggle.is-open span:nth-child(2){top:21px;transform:rotate(-45deg)}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-size:15px;font-weight:600;letter-spacing:.02em;line-height:1;
  padding:14px 28px;border-radius:var(--radius-btn);border:1px solid transparent;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease);
  min-height:46px;
}
.btn-primary{background:var(--pine);color:var(--sand)}
.btn-primary:hover{background:var(--clay);transform:translateY(-1px)}
.btn-primary:active{transform:translateY(0)}
.btn-ghost{background:transparent;color:var(--ink);border-color:rgba(34,38,42,.55)}
.btn-ghost:hover{background:var(--ink);color:var(--sand);border-color:var(--ink)}
.btn-light{background:var(--sand);color:var(--pine)}
.btn-light:hover{background:var(--clay);color:#fff;transform:translateY(-1px)}
.btn-block{width:100%}
.btn-sm{padding:11px 20px;font-size:14px;min-height:42px}
.link-arrow{
  position:relative;display:inline-flex;align-items:center;gap:8px;
  font-size:14.5px;font-weight:600;color:var(--pine);padding-bottom:3px;
}
.link-arrow::after{content:"→";transition:transform .2s var(--ease)}
.link-arrow::before{
  content:"";position:absolute;left:0;right:14px;bottom:0;height:1px;background:var(--clay);
  transform:scaleX(0);transform-origin:left;transition:transform .2s var(--ease);
}
.link-arrow:hover::after{transform:translateX(4px)}
.link-arrow:hover::before{transform:scaleX(1)}
.link-arrow.on-dark{color:var(--sand)}
.link-arrow.on-dark::before{background:var(--clay)}

/* ============ Hero ============ */
.hero{padding:72px 0 88px;background:var(--sand);border-bottom:1px solid var(--line)}
.hero-grid{display:grid;grid-template-columns:7fr 5fr;gap:64px;align-items:center}
.hero h1{
  font-size:clamp(2.5rem,5.2vw,4.5rem);line-height:1.08;letter-spacing:-.02em;
  margin-top:20px;color:var(--ink);
}
.hero-sub{margin-top:24px;font-size:17px;line-height:1.85;color:var(--ink-soft);max-width:34em}
.hero-actions{display:flex;flex-wrap:wrap;gap:16px;margin-top:36px}
.hero-stats{display:flex;flex-wrap:wrap;gap:0;margin-top:48px;padding-top:28px;border-top:1px solid var(--line)}
.stat{padding:0 32px;border-left:1px solid var(--line)}
.stat:first-child{padding-left:0;border-left:0}
.stat-num{
  display:block;font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:clamp(1.7rem,2.4vw,2.3rem);font-weight:700;color:var(--pine);line-height:1.1;
}
.stat-num em{font-style:normal;font-size:.6em;margin-left:2px;color:var(--muted)}
.stat-label{display:block;margin-top:6px;font-size:12px;color:var(--muted);letter-spacing:.04em}
.hero-media{position:relative;padding:12px;border:1px solid var(--line);border-radius:var(--radius-card);background:var(--card)}
.hero-media .media-anchor{position:absolute;top:-10px;left:-10px;width:22px;height:22px;background:var(--clay);border-radius:3px;z-index:2}
.hero-media img{width:100%;aspect-ratio:16/10;object-fit:cover;border-radius:4px;background:var(--sand-deep)}

/* ============ 信任条 ============ */
.trust{padding:26px 0;border-bottom:1px solid var(--line)}
.trust-inner{display:flex;flex-wrap:wrap;align-items:center;gap:12px 44px}
.trust-item{font-size:13px;color:var(--muted);letter-spacing:.02em;display:inline-flex;align-items:center;gap:8px}
.trust-item::before{content:"";width:5px;height:5px;background:var(--clay);border-radius:1px;flex-shrink:0}

/* ============ 功能区（左标题 + 右编号列表） ============ */
.feature-grid{display:grid;grid-template-columns:5fr 7fr;gap:72px;align-items:start}
.sticky-head{position:sticky;top:104px}
.sticky-head h2{font-size:clamp(1.75rem,2.8vw,2.6rem);line-height:1.2;margin-top:14px}
.sticky-head p{margin-top:18px;font-size:16.5px;color:var(--ink-soft)}
.sticky-head .link-arrow{margin-top:28px}
.num-list{border-top:1px solid var(--line)}
.num-item{
  display:grid;grid-template-columns:64px 1fr;gap:20px;
  padding:28px 16px 28px 0;border-bottom:1px solid var(--line);
  transition:background .2s var(--ease),padding-left .2s var(--ease);
}
.num-item:hover{background:var(--sand-deep);padding-left:16px}
.num-index{
  font-family:var(--font-mono);font-size:14px;font-weight:500;color:var(--clay);
  letter-spacing:.08em;padding-top:4px;
}
.num-item h3{font-size:1.25rem;font-weight:600;color:var(--ink);line-height:1.5}
.num-item p{margin-top:8px;font-size:15.5px;color:var(--ink-soft);line-height:1.85}

/* ============ 场景 ============ */
.scene{display:grid;grid-template-columns:7fr 5fr;gap:56px;align-items:center}
.scene + .scene{margin-top:64px}
.scene.is-reverse{grid-template-columns:5fr 7fr}
.scene.is-reverse .scene-copy{order:2}
.scene-copy h3{font-size:clamp(1.3rem,2vw,1.6rem);line-height:1.35}
.scene-copy p{margin-top:14px;font-size:16px;color:var(--ink-soft)}
.point-list{margin-top:22px;display:grid;gap:10px}
.point-list li{position:relative;padding-left:22px;font-size:15.5px;color:var(--ink-soft)}
.point-list li::before{content:"";position:absolute;left:0;top:.78em;width:14px;height:1px;background:var(--clay)}
.scene-copy .link-arrow{margin-top:26px}
.scene-media{position:relative}
.scene-media img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:var(--radius-card);background:var(--sand-deep);border:1px solid var(--line)}

/* ============ 分类入口 ============ */
.topic-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:48px}
.topic-card{
  display:flex;flex-direction:column;gap:12px;
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius-card);
  padding:32px;transition:border-color .2s var(--ease),transform .2s var(--ease),box-shadow .2s var(--ease);
}
.topic-card:hover{border-color:var(--pine);transform:translateY(-3px);box-shadow:var(--shadow-hover)}
.topic-card h3{font-size:1.3rem;font-weight:600}
.topic-card p{font-size:15px;color:var(--ink-soft)}
.topic-card .link-arrow{margin-top:8px}

/* ============ 案例（深色） ============ */
.dark-block{background:var(--pine-deep);color:var(--sand);padding:104px 0}
.dark-block h2{color:var(--sand)}
.case-grid{display:grid;grid-template-columns:7fr 5fr;gap:64px;align-items:start;margin-top:56px}
.case-quote{
  font-size:clamp(1.4rem,2.3vw,1.75rem);line-height:1.6;font-weight:600;color:var(--sand);
  padding-left:24px;border-left:3px solid var(--clay);
}
.case-quote cite{display:block;margin-top:20px;font-size:13px;font-style:normal;color:#A9BDB6;letter-spacing:.06em}
.metric-list{display:grid;gap:28px}
.metric{border-top:1px solid rgba(247,244,238,.16);padding-top:16px}
.metric-num{
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:clamp(2.2rem,3.4vw,3rem);font-weight:700;color:var(--clay);line-height:1.05;
}
.metric-num em{font-style:normal;font-size:.5em;margin-left:4px;color:#A9BDB6}
.metric-label{display:block;margin-top:8px;font-size:13px;color:#A9BDB6}
.case-names{display:flex;flex-wrap:wrap;gap:12px 40px;margin-top:56px;padding-top:28px;border-top:1px solid rgba(247,244,238,.16)}
.case-names span{font-size:14px;color:#C8D6D1;letter-spacing:.02em}
.dark-block .link-arrow{margin-top:32px}

/* ============ 价格 ============ */
.billing-toggle{display:inline-flex;gap:4px;padding:4px;border:1px solid var(--line);border-radius:999px;background:var(--card);margin-top:28px}
.billing-toggle button{
  padding:8px 20px;font-size:13.5px;border-radius:999px;color:var(--muted);
  transition:background .2s var(--ease),color .2s var(--ease);min-height:38px;
}
.billing-toggle button.is-active{background:var(--pine);color:var(--sand)}
.price-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:56px;align-items:start}
.price-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius-card);
  padding:36px 28px;display:flex;flex-direction:column;
  transition:border-color .2s var(--ease),transform .2s var(--ease),box-shadow .2s var(--ease);
}
.price-card:hover{border-color:var(--pine);transform:translateY(-3px);box-shadow:var(--shadow-hover)}
.price-card.is-featured{
  background:var(--pine);border-color:var(--pine);transform:translateY(-8px);
  box-shadow:0 18px 40px rgba(15,58,50,.16);
}
.price-card.is-featured:hover{transform:translateY(-10px)}
.price-card.is-featured h3,.price-card.is-featured .price-tagline{color:var(--sand)}
.price-badge{
  display:inline-block;font-size:12px;letter-spacing:.08em;padding:3px 10px;border-radius:999px;
  background:rgba(196,100,60,.14);color:var(--clay);margin-bottom:16px;align-self:flex-start;
}
.price-card.is-featured .price-badge{background:rgba(247,244,238,.14);color:#E9C3B0}
.price-card h3{font-size:1.2rem;font-weight:600}
.price-tagline{margin-top:8px;font-size:13.5px;color:var(--muted)}
.price-num{
  margin-top:24px;font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:clamp(2.2rem,3.2vw,2.8rem);font-weight:700;color:var(--pine);line-height:1.05;
}
.price-card.is-featured .price-num{color:var(--sand)}
.price-num em{font-style:normal;font-size:.42em;font-weight:500;margin-left:4px;color:var(--muted)}
.price-card.is-featured .price-num em{color:#A9BDB6}
.price-note{margin-top:8px;font-size:12.5px;color:var(--muted);font-family:var(--font-mono)}
.price-card.is-featured .price-note{color:#A9BDB6}
.price-list{margin-top:24px;padding-top:24px;border-top:1px solid var(--line);display:grid;gap:12px}
.price-card.is-featured .price-list{border-top-color:rgba(247,244,238,.18)}
.price-list li{position:relative;padding-left:22px;font-size:14.5px;color:var(--ink-soft);line-height:1.75}
.price-list li::before{
  content:"";position:absolute;left:2px;top:.66em;width:8px;height:8px;
  border-left:1.5px solid var(--clay);border-bottom:1.5px solid var(--clay);transform:rotate(-45deg);
}
.price-card.is-featured .price-list li{color:#D7DED9}
.price-card .btn{margin-top:28px}

/* ============ 最新信息 ============ */
.news-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:24px}
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:48px}
.news-card{
  display:flex;flex-direction:column;background:var(--card);border:1px solid var(--line);
  border-radius:var(--radius-card);overflow:hidden;
  transition:border-color .2s var(--ease),transform .2s var(--ease),box-shadow .2s var(--ease);
}
.news-card:hover{border-color:var(--pine);transform:translateY(-3px);box-shadow:var(--shadow-hover)}
.news-thumb{background:var(--sand-deep);aspect-ratio:16/10;overflow:hidden}
.news-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .35s var(--ease)}
.news-card:hover .news-thumb img{transform:scale(1.03)}
.news-body{padding:24px;display:flex;flex-direction:column;gap:12px;flex:1}
.badge{
  display:inline-block;font-size:12px;letter-spacing:.06em;padding:3px 10px;border-radius:999px;
  background:var(--sand-deep);color:var(--clay);align-self:flex-start;
}
.news-title{
  font-size:1.05rem;font-weight:600;line-height:1.55;color:var(--ink);
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.news-card:hover .news-title{text-decoration:underline;text-underline-offset:4px;text-decoration-color:var(--clay)}
.news-desc{
  font-size:14.5px;color:var(--muted);line-height:1.8;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.news-meta{
  margin-top:auto;padding-top:14px;border-top:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  font-size:12px;color:var(--muted);font-family:var(--font-mono);
}
.empty-state{
  margin-top:48px;padding:64px 24px;border:1px dashed var(--line);border-radius:var(--radius-card);
  text-align:center;background:var(--card);
}
.empty-state p{font-size:14px;color:var(--muted)}
.empty-state .link-arrow{margin-top:16px}

/* ============ FAQ ============ */
.faq-grid{display:grid;grid-template-columns:4fr 8fr;gap:72px;align-items:start}
.faq-list{border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:24px;
  padding:22px 0;text-align:left;font-size:17px;font-weight:600;color:var(--ink);
  transition:color .2s var(--ease);min-height:44px;
}
.faq-q:hover{color:var(--pine)}
.faq-icon{position:relative;flex-shrink:0;width:14px;height:14px}
.faq-icon::before,.faq-icon::after{content:"";position:absolute;background:var(--pine);transition:transform .2s var(--ease),background .2s var(--ease)}
.faq-icon::before{top:6px;left:0;width:14px;height:1.5px}
.faq-icon::after{left:6px;top:0;width:1.5px;height:14px}
.faq-item.is-open .faq-icon::after{transform:rotate(90deg)}
.faq-item.is-open .faq-icon::before{background:var(--clay)}
.faq-a{display:grid;grid-template-rows:0fr;transition:grid-template-rows .28s var(--ease)}
.faq-a > div{overflow:hidden}
.faq-item.is-open .faq-a{grid-template-rows:1fr}
.faq-a p{padding:0 32px 24px 0;font-size:15.5px;line-height:1.9;color:var(--muted)}

/* ============ 结尾 CTA ============ */
.cta-block{background:var(--pine);color:var(--sand);padding:96px 0}
.cta-grid{display:grid;grid-template-columns:6fr 6fr;gap:64px;align-items:center}
.cta-block h2{color:var(--sand);font-size:clamp(1.75rem,2.8vw,2.6rem);line-height:1.2}
.cta-block p{margin-top:16px;font-size:16px;color:#C8D6D1}
.cta-form{display:grid;gap:16px}
.field label{display:block;font-size:12px;letter-spacing:.06em;color:#A9BDB6;margin-bottom:8px}
.field input,.field textarea{
  width:100%;padding:0 14px;height:48px;border-radius:var(--radius-btn);
  border:1px solid rgba(247,244,238,.26);background:rgba(247,244,238,.06);color:var(--sand);
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.field textarea{height:96px;padding:12px 14px;resize:vertical}
.field input::placeholder,.field textarea::placeholder{color:#8EA49D}
.field input:focus,.field textarea:focus{
  outline:none;border-color:var(--sand);box-shadow:0 0 0 2px var(--clay);
}
.form-note{font-size:12px;color:#8EA49D}

/* ============ 页脚 ============ */
.site-footer{background:var(--pine-deep);color:var(--sand);padding:72px 0 0}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.3fr;gap:48px}
.footer-brand{font-size:20px;font-weight:700;color:var(--sand);letter-spacing:.02em}
.footer-desc{margin-top:14px;font-size:14px;color:#A9BDB6;line-height:1.8;max-width:22em}
.footer-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px}
.footer-tags span{
  font-size:12px;padding:3px 10px;border-radius:999px;
  border:1px solid rgba(247,244,238,.2);color:#C8D6D1;
}
.footer-title{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:#8EA49D;
  margin-bottom:16px;
}
.footer-links li + li{margin-top:10px}
.footer-links a{font-size:14.5px;color:#D7DED9;transition:color .2s var(--ease)}
.footer-links a:hover{color:#fff;text-decoration:underline;text-underline-offset:4px}
.footer-contact li + li{margin-top:12px}
.footer-contact a,.footer-contact span{font-size:14.5px;color:#D7DED9;transition:color .2s var(--ease)}
.footer-contact a:hover{color:#fff;text-decoration:underline;text-underline-offset:4px}
.footer-bottom{
  margin-top:56px;border-top:1px solid rgba(247,244,238,.14);padding:20px 0;
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;
  font-size:12px;color:#8EA49D;
}

/* ============ 移动端抽屉 ============ */
.m-drawer{
  position:fixed;inset:0;z-index:80;background:var(--sand);
  display:flex;flex-direction:column;justify-content:space-between;
  padding:88px 24px 32px;opacity:0;visibility:hidden;transform:translateY(-8px);
  transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s var(--ease);
}
.m-drawer.is-open{opacity:1;visibility:visible;transform:none}
.m-nav{display:flex;flex-direction:column}
.m-link{
  font-size:20px;font-weight:600;color:var(--ink);padding:20px 0;
  border-bottom:1px solid var(--line);
}
.m-link.is-active{color:var(--pine)}
.m-link.is-active::after{content:"· 当前";font-size:12px;font-weight:400;color:var(--clay);margin-left:10px;letter-spacing:.06em}
.m-drawer-foot{padding-top:24px}

/* ============ 动效 ============ */
.reveal{opacity:0;transform:translateY(10px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
.reveal.is-in{opacity:1;transform:none}

/* ============ 响应式 ============ */
@media (max-width:1023px){
  .container{padding:0 32px}
  .section{padding:80px 0}
  .section-tight{padding:64px 0}
  .nav-links,.nav-cta{display:none}
  .nav-toggle{display:inline-flex}
  .hero{padding:56px 0 64px}
  .hero-grid{grid-template-columns:1fr;gap:48px}
  .hero h1{font-size:clamp(2rem,6vw,3rem)}
  .hero-media{order:-1}
  .feature-grid{grid-template-columns:1fr;gap:40px}
  .sticky-head{position:static}
  .scene,.scene.is-reverse{grid-template-columns:1fr;gap:32px}
  .scene.is-reverse .scene-copy{order:0}
  .case-grid{grid-template-columns:1fr;gap:40px}
  .topic-grid{grid-template-columns:1fr}
  .price-grid{grid-template-columns:1fr}
  .price-card.is-featured{transform:none}
  .price-card.is-featured:hover{transform:translateY(-3px)}
  .news-grid{grid-template-columns:repeat(2,1fr)}
  .faq-grid{grid-template-columns:1fr;gap:36px}
  .cta-grid{grid-template-columns:1fr;gap:40px}
  .cta-block{padding:72px 0}
  .footer-grid{grid-template-columns:1fr 1fr;gap:40px}
}
@media (max-width:639px){
  .container{padding:0 20px}
  .section{padding:56px 0}
  .nav-wrap{height:64px}
  .hero-stats{gap:20px 0}
  .stat{padding:0 20px}
  .stat-num{font-size:1.5rem}
  .news-grid{grid-template-columns:1fr}
  .num-item{grid-template-columns:44px 1fr;gap:14px;padding:24px 0}
  .num-item:hover{padding-left:0;background:transparent}
  .hero-actions .btn{width:100%}
  .footer-grid{grid-template-columns:1fr;gap:32px}
  .footer-bottom{flex-direction:column;gap:8px}
  .case-names{gap:10px 24px}
  .faq-a p{padding-right:0}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{transition-duration:.01ms!important;animation-duration:.01ms!important;scroll-behavior:auto!important}
  .reveal{opacity:1;transform:none}
}

/* roulang page: article */
:root{
  --pine:#0F3A32;
  --pine-deep:#0B2A24;
  --clay:#C4643C;
  --sand:#F7F4EE;
  --sand-deep:#EFEAE0;
  --line:#E1DACD;
  --ink:#22262A;
  --ink-soft:#4A504C;
  --muted:#6E736F;
  --card:#FFFDF9;
  --radius-card:6px;
  --radius-btn:4px;
  --shadow-card:0 12px 32px rgba(15,58,50,.08);
  --ease:cubic-bezier(.2,.8,.2,1);
  --font-sans:"HarmonyOS Sans SC","PingFang SC","Source Han Sans SC","Noto Sans SC",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,Menlo,monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--sand);
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.8;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
body.nav-open{overflow:hidden}
img{max-width:100%;display:block;border-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
ul,ol{margin:0;padding:0}
h1,h2,h3,h4,p{margin:0}
:focus-visible{outline:2px solid var(--clay);outline-offset:2px;border-radius:2px}
::selection{background:var(--clay);color:#fff}

.container{width:100%;max-width:1240px;margin-inline:auto;padding-inline:48px}
@media (max-width:1023px){.container{padding-inline:32px}}
@media (max-width:639px){.container{padding-inline:20px}}

/* ============ 导航 ============ */
.site-header{
  position:sticky;top:0;z-index:70;
  background:var(--sand);
  border-bottom:1px solid var(--line);
  transition:border-color .2s var(--ease),background .2s var(--ease);
}
.site-header.is-scrolled{border-bottom-color:rgba(34,38,42,.28)}
.header-inner{display:flex;align-items:center;gap:40px;height:72px;transition:height .2s var(--ease)}
.site-header.is-scrolled .header-inner{height:60px}
.brand{display:inline-flex;align-items:baseline;gap:8px;flex:none}
.brand-mark{font-size:20px;font-weight:700;letter-spacing:.02em;color:var(--pine)}
.brand-text{font-size:13px;font-weight:600;letter-spacing:.04em;color:var(--ink-soft)}
.nav-links{display:flex;align-items:center;gap:32px;margin-left:auto}
.nav-link{position:relative;font-size:15px;color:var(--ink-soft);padding:6px 0;transition:color .2s var(--ease)}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
  background:var(--clay);transform:scaleX(0);transform-origin:left;
  transition:transform .2s var(--ease);
}
.nav-link:hover{color:var(--ink)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link.is-active{color:var(--ink);font-weight:600}
.nav-link.is-active::after{transform:scaleX(1)}
.header-actions{display:flex;align-items:center;gap:20px;flex:none}
.nav-toggle{
  display:none;width:44px;height:44px;flex:none;
  align-items:center;justify-content:center;flex-direction:column;gap:6px;
  border-radius:var(--radius-btn);
}
.nav-toggle span{display:block;width:22px;height:1px;background:var(--ink);transition:transform .2s var(--ease),opacity .2s var(--ease)}
body.nav-open .nav-toggle span:nth-child(1){transform:translateY(3.5px) rotate(45deg)}
body.nav-open .nav-toggle span:nth-child(2){transform:translateY(-3.5px) rotate(-45deg)}

/* ============ 按钮 / 链接 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:14px 28px;border-radius:var(--radius-btn);
  font-size:15px;font-weight:600;letter-spacing:.02em;
  transition:background .2s var(--ease),color .2s var(--ease),transform .2s var(--ease),border-color .2s var(--ease);
}
.btn-primary{background:var(--pine);color:var(--sand)}
.btn-primary:hover{background:var(--clay);transform:translateY(-1px)}
.btn-primary:active{transform:translateY(0)}
.btn-sm{padding:10px 20px;font-size:14px}
.btn-outline{border:1px solid var(--ink);color:var(--ink);background:transparent}
.btn-outline:hover{background:var(--ink);color:var(--sand)}
.btn-invert{background:var(--sand);color:var(--pine-deep)}
.btn-invert:hover{background:var(--clay);color:#fff;transform:translateY(-1px)}
.link-arrow{display:inline-flex;align-items:center;gap:6px;font-size:14px;color:var(--ink-soft);transition:color .2s var(--ease)}
.link-arrow::after{content:"→";transition:transform .2s var(--ease)}
.link-arrow:hover{color:var(--clay)}
.link-arrow:hover::after{transform:translateX(4px)}
.link-arrow-light{color:rgba(247,244,238,.78)}
.link-arrow-light:hover{color:var(--clay)}

/* ============ 面包屑 / 文章头 ============ */
.post-section{padding:44px 0 0}
.crumbs{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:12px;color:var(--muted);letter-spacing:.04em;font-family:var(--font-mono)}
.crumbs a{transition:color .2s var(--ease)}
.crumbs a:hover{color:var(--clay)}
.crumbs .sep{color:var(--line)}
.crumbs .current{color:var(--ink);font-family:var(--font-sans)}
.article-head{padding-top:36px}
.article-meta{display:flex;flex-wrap:wrap;align-items:center;gap:12px;font-size:12px;font-family:var(--font-mono);color:var(--muted);letter-spacing:.04em}
.badge{
  display:inline-flex;align-items:center;height:26px;padding:0 12px;border-radius:999px;
  background:rgba(196,100,60,.1);color:var(--clay);
  font-size:12px;font-weight:600;letter-spacing:.08em;font-family:var(--font-sans);
}
.meta-dot{color:var(--line)}
.article-title{
  margin-top:22px;max-width:940px;
  font-size:clamp(2rem,4vw,3.2rem);font-weight:700;line-height:1.16;letter-spacing:-.02em;color:var(--ink);
}
.rule{height:1px;background:var(--line);margin-top:36px}

/* ============ 正文布局 ============ */
.article-layout{
  display:grid;grid-template-columns:minmax(0,760px) 220px;
  gap:72px;justify-content:center;align-items:start;
  padding:40px 0 0;
}
.article-main{min-width:0}
.article-body{font-size:17.5px;line-height:1.95;color:var(--ink-soft)}
.article-body > * + *{margin-top:1.4em}
.article-body h2{
  position:relative;
  font-size:clamp(1.5rem,2.2vw,1.9rem);font-weight:700;line-height:1.35;color:var(--ink);
  margin-top:48px;margin-bottom:16px;padding-left:16px;letter-spacing:-.01em;
}
.article-body h2::before{content:"";position:absolute;left:0;top:.42em;width:3px;height:20px;background:var(--clay)}
.article-body h3{font-size:1.25rem;font-weight:600;color:var(--ink);margin-top:36px;margin-bottom:12px;line-height:1.5}
.article-body h4{font-size:1.05rem;font-weight:600;color:var(--ink);margin-top:28px;margin-bottom:10px}
.article-body p{margin:0}
.article-body ul,.article-body ol{padding-left:0;margin:1.2em 0}
.article-body ul{list-style:none}
.article-body ul > li{position:relative;padding-left:20px;margin:.55em 0}
.article-body ul > li::before{content:"";position:absolute;left:2px;top:.86em;width:6px;height:6px;background:var(--clay)}
.article-body ol{list-style:decimal;padding-left:1.4em}
.article-body ol > li{margin:.55em 0;padding-left:.3em}
.article-body blockquote{
  margin:2em 0;padding:22px 26px;
  background:var(--sand-deep);border-left:3px solid var(--pine);
  color:var(--ink);font-size:17px;font-weight:500;line-height:1.9;
}
.article-body blockquote p{margin:0}
.article-body img{border-radius:6px;width:100%;height:auto;margin:1.6em 0 .8em}
.article-body figure{margin:1.8em 0}
.article-body figcaption{font-size:12px;color:var(--muted);text-align:center;margin-top:10px;font-family:var(--font-mono)}
.article-body table{width:100%;border:1px solid var(--line);border-collapse:collapse;font-size:15px;margin:1.8em 0;background:var(--card)}
.article-body th{background:var(--sand-deep);text-align:left;padding:12px 16px;border-bottom:1px solid var(--line);color:var(--ink);font-weight:600}
.article-body td{padding:12px 16px;border-bottom:1px solid var(--line)}
.article-body tr:last-child td{border-bottom:0}
.article-body a{color:var(--ink);text-decoration:underline;text-decoration-color:var(--clay);text-underline-offset:3px;transition:color .2s var(--ease)}
.article-body a:hover{color:var(--clay)}
.article-body strong{color:var(--ink);font-weight:600}
.article-body hr{border:0;height:1px;background:var(--line);margin:2.4em 0}
.article-body code{font-family:var(--font-mono);font-size:.9em;background:var(--sand-deep);padding:2px 6px;border-radius:3px;color:var(--ink)}
.article-body pre{background:var(--pine-deep);color:var(--sand);padding:20px;border-radius:6px;overflow-x:auto;font-family:var(--font-mono);font-size:14px;line-height:1.7}
.article-body pre code{background:none;color:inherit;padding:0}

/* ============ 目录 ============ */
.toc{position:sticky;top:96px;font-size:13px}
.toc[hidden]{display:none}
.toc-title{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:var(--muted);margin-bottom:14px}
.toc-list{list-style:none;border-left:1px solid var(--line)}
.toc-list li{margin:0}
.toc-list a{
  display:block;padding:6px 0 6px 14px;margin-left:-1px;
  color:var(--ink-soft);border-left:2px solid transparent;
  line-height:1.6;transition:color .2s var(--ease),border-color .2s var(--ease);
}
.toc-list a:hover,.toc-list a.is-current{color:var(--clay);border-left-color:var(--clay)}

/* ============ 文末 ============ */
.article-foot{margin-top:56px;padding-top:32px;border-top:1px solid var(--line)}
.foot-title{font-size:13px;letter-spacing:.14em;color:var(--muted);font-family:var(--font-mono);margin-bottom:20px}
.rel-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.rel-card{
  display:flex;gap:14px;align-items:center;padding:14px;
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius-card);
  transition:border-color .2s var(--ease),transform .2s var(--ease),box-shadow .2s var(--ease);
}
.rel-card:hover{border-color:var(--pine);transform:translateY(-3px);box-shadow:var(--shadow-card)}
.rel-card img{width:60px;height:60px;object-fit:cover;border-radius:4px;flex:none;background:var(--sand-deep)}
.rel-card .rel-body{min-width:0}
.rel-card .rel-tag{font-size:11px;color:var(--clay);letter-spacing:.1em;font-family:var(--font-mono)}
.rel-card .rel-name{
  font-size:14px;font-weight:600;color:var(--ink);line-height:1.5;margin-top:4px;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.article-actions{display:flex;flex-wrap:wrap;align-items:center;gap:16px;margin-top:32px}

/* ============ 空态 ============ */
.empty-state{
  margin:56px auto 0;max-width:640px;text-align:center;
  border:1px dashed var(--line);border-radius:var(--radius-card);
  padding:64px 32px;background:var(--card);
}
.empty-state h1{font-size:clamp(1.5rem,3vw,2rem);font-weight:700;color:var(--ink);margin-bottom:12px}
.empty-state p{font-size:14px;color:var(--muted);margin-bottom:24px}

/* ============ CTA ============ */
.cta-dark{background:var(--pine-deep);color:var(--sand);padding:96px 0}
.cta-inner{display:grid;grid-template-columns:1.4fr 1fr;gap:48px;align-items:center}
.cta-eyebrow{font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;color:var(--clay);margin-bottom:16px}
.cta-title{font-size:clamp(1.75rem,2.8vw,2.6rem);font-weight:700;line-height:1.2;letter-spacing:-.01em;color:var(--sand)}
.cta-desc{margin-top:16px;font-size:16px;line-height:1.9;color:rgba(247,244,238,.72);max-width:520px}
.cta-actions{display:flex;flex-wrap:wrap;align-items:center;gap:20px;justify-content:flex-end}
@media (max-width:1023px){
  .cta-inner{grid-template-columns:1fr;gap:32px}
  .cta-actions{justify-content:flex-start}
}

/* ============ 页脚 ============ */
.site-footer{background:var(--pine-deep);color:var(--sand);padding:72px 0 32px}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:40px}
.footer-brand{font-size:20px;font-weight:700;letter-spacing:-.01em;color:var(--sand)}
.footer-desc{font-size:14px;line-height:1.9;color:rgba(247,244,238,.68);margin:14px 0 18px;max-width:320px}
.footer-tags{display:flex;flex-wrap:wrap;gap:8px}
.footer-tags span{
  font-size:12px;letter-spacing:.08em;padding:4px 10px;border-radius:999px;
  border:1px solid rgba(247,244,238,.22);color:rgba(247,244,238,.72);
}
.footer-title{font-size:13px;font-weight:600;letter-spacing:.12em;color:rgba(247,244,238,.55);margin-bottom:16px}
.footer-links,.footer-contact{list-style:none;display:grid;gap:10px;font-size:14px}
.footer-links a,.footer-contact a{color:rgba(247,244,238,.78);transition:color .2s var(--ease)}
.footer-links a:hover,.footer-contact a:hover{color:var(--clay)}
.footer-contact span{color:rgba(247,244,238,.55)}
.footer-bottom{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;
  margin-top:56px;padding-top:24px;border-top:1px solid rgba(247,244,238,.14);
  font-size:12px;color:rgba(247,244,238,.5);letter-spacing:.02em;
}

/* ============ 渐显 ============ */
.reveal{opacity:0;transform:translateY(10px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
.reveal.in{opacity:1;transform:none}

/* ============ 响应式 ============ */
@media (max-width:1199px){
  .article-layout{grid-template-columns:minmax(0,760px);gap:0}
  .toc{display:none}
}
@media (max-width:1023px){
  .nav-toggle{display:flex}
  .header-actions{margin-left:auto;gap:12px}
  .header-actions .link-arrow{display:none}
  .nav-links{
    position:fixed;inset:0;z-index:60;
    display:flex;flex-direction:column;align-items:stretch;justify-content:flex-start;
    gap:0;margin:0;padding:104px 24px 40px;
    background:var(--sand);
    opacity:0;visibility:hidden;transform:translateY(-12px);
    transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s var(--ease);
  }
  .nav-links.is-open{opacity:1;visibility:visible;transform:none}
  .nav-link{font-size:20px;padding:18px 0;border-bottom:1px solid var(--line)}
  .nav-link:first-child{border-top:1px solid var(--line)}
  .nav-link::after{display:none}
  .rel-list{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .cta-dark{padding:72px 0}
  .site-footer{padding:56px 0 28px}
}
@media (max-width:767px){
  .post-section{padding-top:28px}
  .article-head{padding-top:24px}
  .article-body{font-size:16.5px;line-height:1.9}
  .article-title{font-size:clamp(1.7rem,6vw,2.2rem)}
  .article-actions .btn{width:100%}
  .article-actions .link-arrow{width:100%;justify-content:flex-start}
  .rel-card img{width:52px;height:52px}
}
@media (max-width:639px){
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer-bottom{flex-direction:column;align-items:flex-start;margin-top:36px}
  .btn{padding:12px 22px;min-height:44px}
  .btn-sm{padding:10px 16px;font-size:13px}
  .cta-dark{padding:56px 0}
  .empty-state{padding:44px 20px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms!important;transition-duration:.001ms!important}
  .reveal{opacity:1;transform:none}
}

/* roulang page: category1 */
:root{
  --pine:#0F3A32;
  --pine-deep:#0B2A24;
  --clay:#C4643C;
  --sand:#F7F4EE;
  --sand-deep:#EFEAE0;
  --card:#FFFDF9;
  --line:#E1DACD;
  --ink:#22262A;
  --ink-soft:#4A504C;
  --muted:#6E736F;
  --r-card:6px;
  --r-btn:4px;
  --ease:cubic-bezier(.2,.8,.2,1);
  --shadow-hover:0 12px 32px rgba(15,58,50,.08);
  --font-sans:"HarmonyOS Sans SC","PingFang SC","Source Han Sans SC","Noto Sans SC",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,Menlo,monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:96px}
body{
  margin:0;
  font-family:var(--font-sans);
  font-size:16.5px;
  line-height:1.85;
  color:var(--ink);
  background:var(--sand);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img{max-width:100%;display:block;border:0}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit}
h1,h2,h3,h4,p,ul,ol,figure{margin:0}
ul,ol{padding:0;list-style:none}
::selection{background:rgba(196,100,60,.22);color:var(--pine)}
:focus-visible{outline:2px solid var(--clay);outline-offset:2px;border-radius:2px}
.container{width:100%;max-width:1240px;margin:0 auto;padding:0 48px}
@media (max-width:1023px){.container{padding:0 32px}}
@media (max-width:639px){.container{padding:0 20px}}

/* ============ Header ============ */
.site-header{
  position:sticky;top:0;z-index:80;
  background:var(--sand);
  border-bottom:1px solid var(--line);
  transition:box-shadow .2s var(--ease),background .2s var(--ease);
}
.site-header.is-scrolled{box-shadow:0 1px 0 rgba(15,58,50,.06)}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:24px;height:72px;transition:height .2s var(--ease)}
.site-header.is-scrolled .header-inner{height:60px}
.brand{display:flex;align-items:baseline;gap:8px;flex:0 0 auto}
.brand-mark{font-size:20px;font-weight:700;letter-spacing:.08em;color:var(--pine);line-height:1}
.brand-sub{font-size:13px;letter-spacing:.1em;color:var(--muted);line-height:1}
.brand:hover .brand-mark{color:var(--clay)}
.brand-mark{transition:color .2s var(--ease)}
.nav-links{display:flex;align-items:center;gap:34px}
.nav-link{
  position:relative;display:inline-block;font-size:15px;color:var(--ink-soft);
  padding:8px 0;transition:color .2s var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;background:var(--clay);
  transform:scaleX(0);transform-origin:left;transition:transform .2s var(--ease);
}
.nav-link:hover{color:var(--pine)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link.is-active{color:var(--pine);font-weight:600}
.nav-link.is-active::after{transform:scaleX(1)}
.header-actions{display:flex;align-items:center;gap:20px;flex:0 0 auto}
.nav-text-link{font-size:14px;color:var(--ink-soft);border-bottom:1px solid transparent;transition:all .2s var(--ease)}
.nav-text-link:hover{color:var(--pine);border-bottom-color:var(--pine)}
.nav-toggle{
  display:none;width:44px;height:44px;background:none;border:0;cursor:pointer;
  flex-direction:column;justify-content:center;align-items:center;gap:6px;
}
.nav-toggle span{display:block;width:20px;height:1px;background:var(--ink);transition:transform .2s var(--ease)}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(3.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){transform:translateY(-3.5px) rotate(-45deg)}

/* ============ Buttons ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:14px 28px;min-height:44px;border-radius:var(--r-btn);
  font-size:15px;font-weight:600;letter-spacing:.02em;
  border:1px solid transparent;cursor:pointer;
  transition:background .2s var(--ease),color .2s var(--ease),transform .2s var(--ease),border-color .2s var(--ease);
}
.btn .arrow{display:inline-block;transition:transform .2s var(--ease)}
.btn:hover .arrow{transform:translateX(4px)}
.btn-primary{background:var(--pine);color:var(--sand)}
.btn-primary:hover{background:var(--clay);transform:translateY(-1px)}
.btn-primary:active{transform:translateY(0)}
.btn-ghost{background:transparent;border-color:var(--ink);color:var(--ink)}
.btn-ghost:hover{background:var(--ink);color:var(--sand)}
.btn-sm{padding:10px 20px;min-height:40px;font-size:14px}
.btn-link{
  display:inline-flex;align-items:center;gap:6px;font-size:15px;font-weight:600;
  color:var(--pine);position:relative;padding-bottom:2px;
}
.btn-link::after{
  content:"";position:absolute;left:0;bottom:0;height:1px;width:100%;background:var(--clay);
  transform:scaleX(0);transform-origin:left;transition:transform .2s var(--ease);
}
.btn-link:hover{color:var(--clay)}
.btn-link:hover::after{transform:scaleX(1)}

/* ============ Page hero ============ */
.page-hero{background:var(--sand);border-bottom:1px solid var(--line);padding:52px 0 64px}
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--muted);
  margin-bottom:30px;
}
.breadcrumb a:hover{color:var(--pine)}
.breadcrumb .sep{color:var(--line)}
.breadcrumb .current{color:var(--ink)}
.eyebrow{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;
  color:var(--clay);margin-bottom:18px;
}
.page-hero h1{
  font-size:clamp(2rem,4.4vw,3.35rem);
  font-weight:700;line-height:1.1;letter-spacing:-.02em;color:var(--pine);
  max-width:19em;margin-bottom:24px;
}
.hero-lead{font-size:17px;line-height:1.9;color:var(--ink-soft);max-width:44em}
.metrics{
  display:grid;grid-template-columns:repeat(3,minmax(0,auto));justify-content:start;
  margin-top:40px;padding-top:26px;border-top:1px solid var(--line);max-width:820px;
}
.metric{padding-right:44px}
.metric + .metric{padding-left:44px;border-left:1px solid var(--line)}
.metric-num{
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:clamp(1.5rem,2.6vw,2.1rem);font-weight:700;line-height:1.15;color:var(--pine);
}
.metric-label{font-size:12px;letter-spacing:.06em;color:var(--muted);margin-top:6px}

/* ============ Doc layout ============ */
.doc-wrap{padding:80px 0 96px}
.doc-layout{display:grid;grid-template-columns:3fr 9fr;gap:56px;align-items:start}
.doc-aside{position:sticky;top:100px}
.idx-label{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--muted);
  margin-bottom:16px;text-transform:uppercase;
}
.idx-list{border-left:1px solid var(--line)}
.idx-list a{
  display:block;margin-left:-1px;padding:9px 0 9px 18px;
  font-size:14px;color:var(--ink-soft);border-left:2px solid transparent;
  transition:color .2s var(--ease),padding-left .2s var(--ease),border-color .2s var(--ease);
}
.idx-list a:hover{color:var(--pine);padding-left:22px}
.idx-list a.is-active{color:var(--clay);border-left-color:var(--clay);font-weight:600}
.doc-aside .aside-note{
  margin-top:28px;padding:18px 20px;background:var(--card);border:1px solid var(--line);
  border-radius:var(--r-card);font-size:13px;line-height:1.8;color:var(--muted);
}
.doc-aside .aside-note strong{display:block;color:var(--ink);font-size:14px;margin-bottom:4px;font-weight:600}

.doc-section{padding-bottom:56px;margin-bottom:56px;border-bottom:1px solid var(--line)}
.doc-section:last-child{padding-bottom:0;margin-bottom:0;border-bottom:0}
.doc-section h2{
  font-size:clamp(1.4rem,2.2vw,1.85rem);font-weight:700;line-height:1.25;
  letter-spacing:-.01em;color:var(--pine);margin-bottom:16px;
  display:flex;align-items:flex-start;gap:14px;
}
.doc-section h2::before{
  content:"";flex:0 0 auto;width:3px;height:1.1em;background:var(--clay);margin-top:.18em;
}
.doc-section .section-lead{font-size:16px;color:var(--ink-soft);line-height:1.9;margin-bottom:8px;max-width:40em}

.num-list{margin-top:30px;border-top:1px solid var(--line)}
.num-item{
  display:grid;grid-template-columns:56px 1fr;gap:18px;
  padding:20px 0;border-bottom:1px solid var(--line);
  transition:background .2s var(--ease),padding-left .2s var(--ease);
}
.num-item:hover{background:var(--sand-deep);padding-left:8px}
.num-no{
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:14px;font-weight:500;color:var(--clay);letter-spacing:.06em;padding-top:2px;
}
.num-title{font-size:1.02rem;font-weight:600;color:var(--ink);line-height:1.6;margin-bottom:4px}
.num-desc{font-size:15px;line-height:1.85;color:var(--ink-soft)}

.doc-banner{margin:0 0 56px;border:1px solid var(--line);border-radius:var(--r-card);overflow:hidden;background:var(--sand-deep)}
.doc-banner img{width:100%;height:auto;aspect-ratio:16/6;object-fit:cover}
.doc-banner figcaption{font-size:12px;color:var(--muted);padding:10px 16px;border-top:1px solid var(--line);background:var(--card)}

/* ============ FAQ ============ */
.faq-block{padding:0 0 96px}
.faq-head{margin-bottom:36px}
.faq-head h2{
  font-size:clamp(1.5rem,2.4vw,2rem);font-weight:700;letter-spacing:-.01em;color:var(--pine);
}
.faq-head p{font-size:15px;color:var(--muted);margin-top:10px}
.faq-list{border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding:22px 0;background:none;border:0;text-align:left;cursor:pointer;
  font-size:17px;font-weight:600;line-height:1.6;color:var(--ink);
  transition:color .2s var(--ease);
}
.faq-q:hover{color:var(--pine)}
.faq-icon{position:relative;flex:0 0 14px;width:14px;height:14px}
.faq-icon::before,.faq-icon::after{
  content:"";position:absolute;background:var(--clay);transition:transform .2s var(--ease);
}
.faq-icon::before{left:0;right:0;top:6.5px;height:1px}
.faq-icon::after{top:0;bottom:0;left:6.5px;width:1px}
.faq-item.is-open .faq-icon::after{transform:scaleY(0)}
.faq-a{display:none;padding:0 0 24px;font-size:16px;line-height:1.9;color:var(--muted);max-width:52em}
.faq-item.is-open .faq-a{display:block}

/* ============ CTA ============ */
.cta-band{background:var(--sand-deep);border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:80px 0}
.cta-grid{display:grid;grid-template-columns:7fr 5fr;gap:56px;align-items:center}
.cta-band h2{
  font-size:clamp(1.6rem,2.6vw,2.3rem);font-weight:700;line-height:1.22;
  letter-spacing:-.01em;color:var(--pine);margin-bottom:16px;
}
.cta-band p{font-size:16px;line-height:1.9;color:var(--ink-soft);max-width:34em}
.cta-actions{display:flex;flex-wrap:wrap;gap:16px;margin-top:28px}
.cta-form{display:grid;gap:16px;background:var(--card);border:1px solid var(--line);border-radius:var(--r-card);padding:28px}
.field{display:grid;gap:8px}
.field label{font-size:12px;color:var(--muted);letter-spacing:.04em}
.field input,.field select{
  height:48px;padding:0 14px;font-family:var(--font-sans);font-size:15px;color:var(--ink);
  background:var(--sand);border:1px solid var(--line);border-radius:var(--r-btn);
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
  width:100%;appearance:none;
}
.field input::placeholder{color:#9AA09B}
.field input:focus,.field select:focus{
  outline:none;border-color:var(--pine);box-shadow:0 0 0 3px rgba(196,100,60,.18);
}
.form-hint{font-size:12px;color:var(--muted);line-height:1.7}

/* ============ Footer ============ */
.site-footer{background:var(--pine-deep);color:var(--sand);padding:64px 0 0}
.footer-grid{display:grid;grid-template-columns:1.8fr 1fr 1fr 1.2fr;gap:48px;padding-bottom:48px}
.footer-brand{font-size:18px;font-weight:700;letter-spacing:.02em;margin-bottom:12px}
.footer-desc{font-size:14px;line-height:1.8;color:rgba(247,244,238,.72);margin-bottom:18px;max-width:24em}
.footer-tags{display:flex;flex-wrap:wrap;gap:8px}
.footer-tags span{
  font-size:12px;padding:3px 10px;border-radius:999px;
  border:1px solid rgba(247,244,238,.24);color:rgba(247,244,238,.82);
}
.footer-title{font-size:13px;letter-spacing:.1em;color:rgba(247,244,238,.55);margin-bottom:16px}
.footer-links,.footer-contact{display:grid;gap:10px}
.footer-links a,.footer-contact a,.footer-contact span{font-size:14px;color:rgba(247,244,238,.82);transition:color .2s var(--ease)}
.footer-links a:hover,.footer-contact a:hover{color:var(--clay)}
.footer-bottom{
  border-top:1px solid rgba(247,244,238,.14);padding:20px 0;
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px;
  font-size:12px;color:rgba(247,244,238,.55);
}

/* ============ Reveal ============ */
.reveal{opacity:0;transform:translateY(10px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
.reveal.is-in{opacity:1;transform:none}

/* ============ Responsive ============ */
@media (max-width:1023px){
  .header-actions .btn-sm,.header-actions .nav-text-link{display:none}
  .nav-toggle{display:flex}
  .nav-links{
    display:none;position:absolute;top:100%;left:0;right:0;
    flex-direction:column;align-items:stretch;gap:0;
    background:var(--sand);border-bottom:1px solid var(--line);
    padding:8px 32px 24px;
  }
  .nav-links.is-open{display:flex}
  .nav-links .nav-link{font-size:18px;padding:16px 0;border-bottom:1px solid var(--line);width:100%}
  .nav-links .nav-link::after{display:none}
  .nav-links .nav-link.is-active{color:var(--clay)}
  .page-hero{padding:36px 0 48px}
  .doc-wrap{padding:56px 0 64px}
  .doc-layout{grid-template-columns:1fr;gap:36px}
  .doc-aside{position:static;top:auto}
  .idx-label{display:none}
  .idx-list{display:flex;gap:8px;overflow-x:auto;border-left:0;padding-bottom:6px;scrollbar-width:thin}
  .idx-list a{
    margin-left:0;border:1px solid var(--line);border-radius:999px;
    padding:7px 16px;white-space:nowrap;font-size:13px;flex:0 0 auto;
  }
  .idx-list a:hover{padding-left:16px;border-color:var(--pine)}
  .idx-list a.is-active{border-color:var(--clay);background:rgba(196,100,60,.08)}
  .doc-aside .aside-note{display:none}
  .cta-grid{grid-template-columns:1fr;gap:32px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:36px}
}
@media (max-width:767px){
  body{font-size:16px}
  .metrics{grid-template-columns:1fr;gap:18px;padding-top:22px;margin-top:32px;max-width:none}
  .metric{padding-right:0}
  .metric + .metric{padding-left:0;border-left:0;padding-top:18px;border-top:1px solid var(--line)}
  .num-item{grid-template-columns:40px 1fr;gap:12px}
  .doc-section h2{gap:12px}
  .doc-banner img{aspect-ratio:16/9}
  .cta-band{padding:56px 0}
  .cta-form{padding:22px}
  .footer-grid{grid-template-columns:1fr;gap:32px}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .faq-q{font-size:16px;padding:18px 0}
}
@media (max-width:520px){
  .page-hero h1{font-size:1.75rem}
  .nav-links{padding:8px 20px 20px}
  .btn{width:100%}
  .cta-actions{flex-direction:column;align-items:stretch}
  .cta-actions .btn{width:100%}
  .header-actions{gap:8px}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important}
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none}
}

/* roulang page: category2 */
:root{
  --pine:#0F3A32;
  --pine-deep:#0B2A24;
  --clay:#C4643C;
  --sand:#F7F4EE;
  --sand-deep:#EFEAE0;
  --card:#FFFDF9;
  --line:#E1DACD;
  --ink:#22262A;
  --ink-soft:#4A504C;
  --muted:#6E736F;
  --radius:6px;
  --radius-sm:4px;
  --shadow:0 12px 32px rgba(15,58,50,.08);
  --ease:cubic-bezier(.2,.8,.2,1);
  --font-sans:"HarmonyOS Sans SC","PingFang SC","Source Han Sans SC","Noto Sans SC",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,Menlo,monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.85;
  color:var(--ink);
  background-color:var(--sand);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,p{margin:0}
::selection{background:var(--clay);color:#fff}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:var(--sand-deep)}
::-webkit-scrollbar-thumb{background:#C9C0AF;border-radius:6px}
::-webkit-scrollbar-thumb:hover{background:var(--pine)}
:focus-visible{outline:2px solid var(--clay);outline-offset:2px;border-radius:2px}

.container{width:100%;max-width:1240px;margin:0 auto;padding:0 48px}
.section{padding:112px 0}
.section-alt{background:var(--sand-deep)}
.section-dark{background:var(--pine-deep);color:var(--sand)}
.section-line{border-top:1px solid var(--line)}

/* ---------- 通用文字与组件 ---------- */
.eyebrow{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.14em;
  color:var(--clay);
  margin-bottom:16px;
}
.section-head{max-width:720px;margin-bottom:48px}
.section-title{
  font-size:clamp(1.75rem,2.8vw,2.6rem);
  font-weight:700;
  line-height:1.2;
  letter-spacing:-.01em;
  color:var(--ink);
}
.section-desc{margin-top:18px;font-size:16.5px;line-height:1.9;color:var(--ink-soft)}
.section-dark .section-title{color:var(--sand)}
.section-dark .section-desc{color:rgba(247,244,238,.74)}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:44px;
  padding:14px 28px;
  border-radius:var(--radius-sm);
  font-size:15px;
  font-weight:600;
  letter-spacing:.02em;
  transition:background-color .2s var(--ease),color .2s var(--ease),transform .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.btn .arrow{transition:transform .2s var(--ease)}
.btn:hover .arrow{transform:translateX(4px)}
.btn-primary{background:var(--pine);color:var(--sand)}
.btn-primary:hover{background:var(--clay);transform:translateY(-1px)}
.btn-primary:active{transform:translateY(0)}
.btn-outline{border:1px solid var(--ink);color:var(--ink)}
.btn-outline:hover{background:var(--ink);color:var(--sand)}
.btn-light{background:var(--sand);color:var(--pine-deep)}
.btn-light:hover{background:var(--clay);color:#fff;transform:translateY(-1px)}
.btn-ghost-light{border:1px solid rgba(247,244,238,.42);color:var(--sand)}
.btn-ghost-light:hover{background:rgba(247,244,238,.12);border-color:var(--sand)}
.btn-sm{padding:10px 20px;font-size:14px;min-height:40px}

.text-link{
  display:inline-flex;
  align-items:center;
  gap:8px;
  position:relative;
  font-size:15px;
  font-weight:600;
  color:var(--pine);
  padding-bottom:4px;
}
.text-link::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:0;
  height:1px;
  background:var(--clay);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .24s var(--ease);
}
.text-link:hover::after{transform:scaleX(1)}
.text-link .arrow{transition:transform .2s var(--ease)}
.text-link:hover .arrow{transform:translateX(4px)}
.section-dark .text-link{color:var(--sand)}

/* ---------- 头部导航 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:rgba(247,244,238,.97);
  border-bottom:1px solid var(--line);
  transition:box-shadow .2s var(--ease),border-color .2s var(--ease);
}
.site-header.is-scrolled{
  box-shadow:0 1px 0 var(--line),0 8px 24px rgba(15,58,50,.05);
}
.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:32px;
  height:72px;
  transition:height .2s var(--ease);
}
.site-header.is-scrolled .header-inner{height:60px}
.logo{display:flex;align-items:baseline;gap:10px;flex:none}
.logo-mark{font-size:20px;font-weight:700;letter-spacing:.06em;color:var(--pine)}
.logo-text{
  font-size:12.5px;
  letter-spacing:.14em;
  color:var(--muted);
  padding-left:10px;
  border-left:1px solid var(--line);
}
.nav-links{display:flex;align-items:center;gap:30px}
.nav-link{
  position:relative;
  display:inline-block;
  font-size:15px;
  color:var(--ink-soft);
  padding:6px 0;
  transition:color .2s var(--ease);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;right:0;bottom:-2px;
  height:2px;
  background:var(--clay);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform .24s var(--ease);
}
.nav-link:hover{color:var(--pine)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link.is-active{color:var(--pine);font-weight:600}
.nav-link.is-active::after{transform:scaleX(1)}
.header-actions{display:flex;align-items:center;gap:16px;flex:none}
.header-actions .text-action{font-size:14px;color:var(--ink-soft)}
.header-actions .text-action:hover{color:var(--clay)}
.nav-toggle{
  display:none;
  width:44px;height:44px;
  align-items:center;
  justify-content:center;
  flex-direction:column;
  gap:6px;
  border:1px solid var(--line);
  border-radius:var(--radius-sm);
  background:var(--card);
}
.nav-toggle span{
  display:block;
  width:18px;height:1px;
  background:var(--ink);
  transition:transform .2s var(--ease),opacity .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(3.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){transform:translateY(-3.5px) rotate(-45deg)}
body.no-scroll{overflow:hidden}

/* ---------- Hero 深色页头 ---------- */
.hero-dark{
  position:relative;
  overflow:hidden;
  background-color:var(--pine-deep);
  color:var(--sand);
  padding:56px 0 88px;
  border-bottom:1px solid rgba(247,244,238,.12);
}
.hero-dark::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:url('/assets/images/backpic/back-2.png');
  background-size:cover;
  background-position:center;
  opacity:.2;
}
.hero-dark::after{
  content:"";
  position:absolute;
  top:0;left:0;
  width:64px;height:64px;
  background:var(--clay);
  opacity:.85;
}
.hero-dark .container{position:relative;z-index:1}
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-size:12px;
  font-family:var(--font-mono);
  color:rgba(247,244,238,.52);
  margin-bottom:36px;
}
.breadcrumb a{color:rgba(247,244,238,.72)}
.breadcrumb a:hover{color:var(--sand)}
.breadcrumb .sep{color:rgba(247,244,238,.32)}
.breadcrumb .current{color:var(--sand)}
.hero-dark .eyebrow{color:#E39A73}
.hero-title{
  font-size:clamp(2.1rem,4.2vw,3.5rem);
  font-weight:700;
  line-height:1.16;
  letter-spacing:-.02em;
  max-width:820px;
  color:var(--sand);
}
.hero-lead{
  margin-top:24px;
  max-width:680px;
  font-size:17px;
  line-height:1.95;
  color:rgba(247,244,238,.76);
}
.hero-actions{display:flex;flex-wrap:wrap;gap:16px;margin-top:40px}
.metrics{
  display:flex;
  flex-wrap:wrap;
  gap:0;
  margin-top:56px;
  padding-top:32px;
  border-top:1px solid rgba(247,244,238,.16);
}
.metric{padding-right:40px;margin-right:40px;border-right:1px solid rgba(247,244,238,.16)}
.metric:last-child{border-right:0;margin-right:0;padding-right:0}
.metric-num{
  font-family:var(--font-mono);
  font-size:clamp(1.8rem,2.6vw,2.4rem);
  font-weight:700;
  line-height:1.1;
  color:var(--clay);
  font-variant-numeric:tabular-nums;
}
.metric-label{margin-top:8px;font-size:12.5px;color:rgba(247,244,238,.62);letter-spacing:.04em}

/* ---------- 流程条 ---------- */
.steps{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:24px;
}
.step{
  position:relative;
  padding-top:24px;
  border-top:1px solid var(--line);
}
.step::before{
  content:"";
  position:absolute;
  top:-1px;left:0;
  width:32px;height:1px;
  background:var(--clay);
}
.step-num{
  display:block;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.1em;
  color:var(--clay);
  margin-bottom:14px;
}
.step-title{font-size:19px;font-weight:600;color:var(--ink);margin-bottom:10px}
.step-text{font-size:15px;line-height:1.85;color:var(--ink-soft)}

/* ---------- 图文交替 ---------- */
.split{
  display:grid;
  grid-template-columns:5fr 7fr;
  gap:64px;
  align-items:center;
}
.split.reverse{grid-template-columns:7fr 5fr}
.split + .split{margin-top:88px}
.split-media{position:relative}
.split-media img{
  width:100%;
  aspect-ratio:16/10;
  object-fit:cover;
  border-radius:var(--radius);
  border:1px solid var(--line);
  background:var(--sand-deep);
}
.split-media::after{
  content:"";
  position:absolute;
  inset:0;
  border:1px solid var(--line);
  border-radius:var(--radius);
  transform:translate(12px,12px);
  z-index:-1;
}
.split-title{
  font-size:clamp(1.35rem,2vw,1.75rem);
  font-weight:700;
  line-height:1.35;
  color:var(--ink);
  margin-bottom:16px;
}
.split-text{font-size:16.5px;line-height:1.9;color:var(--ink-soft)}
.check-list{margin:26px 0 28px}
.check-list li{
  position:relative;
  padding-left:22px;
  margin-bottom:12px;
  font-size:15.5px;
  line-height:1.85;
  color:var(--ink-soft);
}
.check-list li::before{
  content:"";
  position:absolute;
  left:2px;top:10px;
  width:8px;height:8px;
  border-left:1px solid var(--clay);
  border-bottom:1px solid var(--clay);
  transform:rotate(-45deg);
}

/* ---------- 场景要点清单 ---------- */
.notes-grid{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:0 56px;
}
.note-item{
  display:flex;
  gap:14px;
  padding:18px 0;
  border-bottom:1px solid var(--line);
}
.note-item::before{
  content:"";
  flex:none;
  width:6px;height:6px;
  margin-top:11px;
  background:var(--clay);
}
.note-item strong{display:block;font-size:16px;font-weight:600;color:var(--ink);margin-bottom:4px}
.note-item span{font-size:15px;line-height:1.85;color:var(--ink-soft)}

/* ---------- 推荐链接卡 ---------- */
.rec-list{display:grid;gap:20px}
.rec-card{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:32px;
  padding:28px 32px;
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius);
  transition:border-color .2s var(--ease),transform .2s var(--ease),box-shadow .2s var(--ease);
}
.rec-card:hover{
  border-color:var(--pine);
  transform:translateY(-3px);
  box-shadow:var(--shadow);
}
.rec-tag{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.1em;
  color:var(--clay);
  background:rgba(196,100,60,.08);
  border-radius:999px;
  padding:3px 12px;
  margin-bottom:12px;
}
.rec-title{font-size:19px;font-weight:600;color:var(--ink);margin-bottom:8px}
.rec-desc{font-size:15px;line-height:1.85;color:var(--muted);max-width:640px}
.rec-arrow{
  flex:none;
  font-family:var(--font-mono);
  font-size:20px;
  color:var(--clay);
  transition:transform .2s var(--ease);
}
.rec-card:hover .rec-arrow{transform:translateX(6px)}

/* ---------- FAQ ---------- */
.faq-layout{display:grid;grid-template-columns:4fr 8fr;gap:64px;align-items:start}
.faq-item{border-bottom:1px solid var(--line)}
.faq-item:first-child{border-top:1px solid var(--line)}
.faq-q-wrap{margin:0}
.faq-q{
  width:100%;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  padding:24px 0;
  font-size:18px;
  font-weight:600;
  line-height:1.6;
  text-align:left;
  color:var(--ink);
  transition:color .2s var(--ease);
}
.faq-q:hover{color:var(--pine)}
.faq-icon{
  position:relative;
  flex:none;
  width:16px;height:16px;
  transition:transform .24s var(--ease);
}
.faq-icon::before,.faq-icon::after{
  content:"";
  position:absolute;
  background:var(--ink-soft);
  transition:background .2s var(--ease);
}
.faq-icon::before{left:0;top:7.5px;width:16px;height:1px}
.faq-icon::after{left:7.5px;top:0;width:1px;height:16px}
.faq-q[aria-expanded="true"] .faq-icon{transform:rotate(45deg)}
.faq-q[aria-expanded="true"] .faq-icon::before,
.faq-q[aria-expanded="true"] .faq-icon::after{background:var(--clay)}
.faq-a{
  max-height:0;
  overflow:hidden;
  transition:max-height .3s var(--ease);
}
.faq-a-inner{
  padding:0 40px 24px 0;
  font-size:15.8px;
  line-height:1.9;
  color:var(--muted);
}

/* ---------- CTA ---------- */
.cta-block{
  background:var(--sand-deep);
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  padding:96px 0;
}
.cta-layout{display:grid;grid-template-columns:5fr 7fr;gap:64px;align-items:center}
.cta-title{
  font-size:clamp(1.6rem,2.4vw,2.2rem);
  font-weight:700;
  line-height:1.28;
  color:var(--ink);
}
.cta-desc{margin-top:16px;font-size:16px;line-height:1.9;color:var(--ink-soft)}
.cta-note{margin-top:20px;font-size:13px;color:var(--muted)}
.form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.field{display:flex;flex-direction:column;gap:8px}
.field.full{grid-column:1 / -1}
.field label{font-size:12.5px;color:var(--muted);letter-spacing:.04em}
.field input,
.field select{
  height:48px;
  padding:0 14px;
  font-family:inherit;
  font-size:15px;
  color:var(--ink);
  background:var(--card);
  border:1px solid var(--line);
  border-radius:var(--radius-sm);
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.field input::placeholder{color:#A9A79F}
.field input:focus,
.field select:focus{
  outline:none;
  border-color:var(--pine);
  box-shadow:0 0 0 2px rgba(196,100,60,.35);
}
.form-actions{grid-column:1 / -1;display:flex;align-items:center;gap:20px;flex-wrap:wrap;margin-top:4px}
.form-hint{font-size:12.5px;color:var(--muted)}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--pine-deep);color:var(--sand)}
.footer-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1.15fr;
  gap:48px;
  padding:76px 0 48px;
}
.footer-brand{font-size:19px;font-weight:700;letter-spacing:.02em;color:var(--sand)}
.footer-desc{
  margin-top:16px;
  font-size:14px;
  line-height:1.9;
  color:rgba(247,244,238,.7);
  max-width:290px;
}
.footer-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px}
.footer-tags span{
  font-size:12px;
  letter-spacing:.06em;
  color:rgba(247,244,238,.72);
  border:1px solid rgba(247,244,238,.24);
  border-radius:999px;
  padding:3px 12px;
}
.footer-title{
  font-size:12.5px;
  letter-spacing:.14em;
  color:rgba(247,244,238,.5);
  margin-bottom:20px;
}
.footer-links li{margin-bottom:12px}
.footer-links a{
  font-size:14.5px;
  color:rgba(247,244,238,.82);
  transition:color .2s var(--ease);
}
.footer-links a:hover{color:var(--clay)}
.footer-contact li{margin-bottom:12px;font-size:14.5px;color:rgba(247,244,238,.82)}
.footer-contact a{transition:color .2s var(--ease)}
.footer-contact a:hover{color:var(--clay)}
.footer-bottom{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  flex-wrap:wrap;
  padding:22px 0 34px;
  border-top:1px solid rgba(247,244,238,.14);
  font-size:12px;
  color:rgba(247,244,238,.56);
}

/* ---------- 进入视口动效 ---------- */
.reveal{opacity:0;transform:translateY(12px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
.reveal.is-visible{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (max-width:1279px){
  .container{padding:0 36px}
}
@media (max-width:1023px){
  .container{padding:0 32px}
  .section{padding:80px 0}
  .nav-toggle{display:flex}
  .header-actions .text-action{display:none}
  .nav-links{
    position:fixed;
    inset:0;
    z-index:70;
    display:flex;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    padding:100px 32px 120px;
    background:var(--sand);
    overflow-y:auto;
    opacity:0;
    visibility:hidden;
    transform:translateY(-8px);
    transition:opacity .22s var(--ease),transform .22s var(--ease),visibility .22s;
  }
  .nav-links.is-open{opacity:1;visibility:visible;transform:none}
  .nav-link{
    font-size:20px;
    padding:22px 0;
    border-bottom:1px solid var(--line);
    color:var(--ink);
  }
  .nav-link::after{display:none}
  .nav-link.is-active{color:var(--clay)}
  .site-header{z-index:90}
  .hero-dark{padding:44px 0 72px}
  .steps{grid-template-columns:repeat(2,1fr);gap:32px}
  .split,
  .split.reverse{grid-template-columns:1fr;gap:32px}
  .split + .split{margin-top:64px}
  .split-media{order:-1}
  .split-media::after{transform:translate(8px,8px)}
  .faq-layout{grid-template-columns:1fr;gap:32px}
  .cta-layout{grid-template-columns:1fr;gap:40px}
  .footer-grid{grid-template-columns:repeat(2,1fr);gap:40px;padding:56px 0 36px}
  .split-media img{aspect-ratio:16/9}
}
@media (max-width:639px){
  .container{padding:0 20px}
  .section{padding:56px 0}
  .header-inner{height:64px;gap:16px}
  .site-header.is-scrolled .header-inner{height:56px}
  .logo-mark{font-size:18px}
  .logo-text{font-size:11px;letter-spacing:.1em;padding-left:8px}
  .hero-dark{padding:36px 0 56px}
  .hero-dark::after{width:44px;height:44px}
  .hero-title{font-size:clamp(1.75rem,7.4vw,2.3rem)}
  .hero-lead{font-size:15.5px}
  .hero-actions{gap:12px;margin-top:32px}
  .hero-actions .btn{width:100%}
  .metrics{margin-top:40px;padding-top:24px;gap:20px 0}
  .metric{padding-right:20px;margin-right:20px;flex:1 1 auto}
  .metric-num{font-size:1.6rem}
  .metric-label{font-size:11.5px}
  .steps{grid-template-columns:1fr;gap:24px}
  .notes-grid{grid-template-columns:1fr;gap:0}
  .rec-card{flex-direction:column;align-items:flex-start;gap:16px;padding:24px}
  .rec-arrow{display:none}
  .faq-q{font-size:16.5px;padding:20px 0}
  .faq-a-inner{padding-right:0}
  .cta-block{padding:56px 0}
  .form-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:32px;padding:48px 0 28px}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:8px}
  .section-head{margin-bottom:32px}
}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms!important;transition-duration:.001ms!important}
  .reveal{opacity:1;transform:none}
}