/* roulang page: index */
:root{
  --brand-600:#1E6B93;
  --brand-700:#16506E;
  --brand-900:#0E2A3D;
  --brand-100:#E3EEF4;
  --accent:#C97A2B;
  --accent-soft:#F6E7D3;
  --accent-text:#8A5A20;
  --bg:#F7F9FA;
  --surface:#FFFFFF;
  --line:#E1E8ED;
  --text:#16202A;
  --muted:#5C6B77;
  --warn:#B4472F;
  --ok:#2E8B6E;
  --sh-1:0 1px 2px rgba(14,42,61,.05);
  --sh-2:0 8px 24px rgba(14,42,61,.08);
  --sh-3:0 18px 40px rgba(14,42,61,.12);
  --r-nav:20px;
  --r-card:18px;
  --r-md:14px;
  --r-xs:10px;
  --r-badge:8px;
  --sp-section:88px;

  --bs-primary:#1E6B93;
  --bs-primary-rgb:30,107,147;
  --bs-body-color:#16202A;
  --bs-body-bg:#F7F9FA;
  --bs-border-color:#E1E8ED;
  --bs-border-radius:14px;
  --bs-border-radius-lg:18px;
  --bs-body-font-family:system-ui,-apple-system,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:system-ui,-apple-system,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  font-size:16px;
  line-height:1.8;
  color:var(--text);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img{max-width:100%;display:block;border:0;}
a{color:var(--brand-700);text-decoration:none;transition:color .16s ease;}
a:hover{color:var(--brand-600);}
ul,ol{margin:0;padding:0;list-style:none;}
h1,h2,h3,h4{margin:0;color:var(--brand-900);font-weight:600;letter-spacing:0;}
p{margin:0;}
button{font-family:inherit;}
a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:2px;
  border-radius:6px;
}
.container{
  width:100%;
  max-width:1160px;
  margin:0 auto;
  padding:0 20px;
}
[id]{scroll-margin-top:96px;}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:46px;padding:0 22px;border-radius:999px;
  font-size:15px;font-weight:600;line-height:1;
  border:1.5px solid transparent;cursor:pointer;
  transition:background-color .16s ease,color .16s ease,box-shadow .16s ease,transform .16s ease,border-color .16s ease;
  text-decoration:none;
}
.btn-brand{background:var(--brand-600);color:#fff;}
.btn-brand:hover{background:var(--brand-700);color:#fff;box-shadow:var(--sh-2);transform:translateY(-1px);}
.btn-brand:active{transform:none;box-shadow:none;}
.btn-outline-brand{background:transparent;border-color:var(--brand-600);color:var(--brand-700);}
.btn-outline-brand:hover{background:var(--brand-100);color:var(--brand-700);box-shadow:none;transform:none;}
.btn-ghost{background:transparent;border:0;color:var(--brand-700);padding:0;height:auto;font-weight:600;}
.btn-ghost:hover{color:var(--brand-600);}
.btn-ghost .arrow{display:inline-block;transition:transform .16s ease;}
.btn-ghost:hover .arrow{transform:translateX(3px);}
.btn-ghost:hover .ghost-label{text-decoration:underline;text-underline-offset:4px;}
.btn-sm{height:40px;padding:0 18px;font-size:14px;}
.btn[disabled],.btn.disabled{opacity:.5;pointer-events:none;}

/* ---------- 徽章 ---------- */
.badge-soft{
  display:inline-flex;align-items:center;padding:4px 10px;border-radius:var(--r-badge);
  background:var(--brand-100);color:var(--brand-700);font-size:12px;font-weight:600;line-height:1.6;
}
.badge-accent{
  display:inline-flex;align-items:center;gap:6px;padding:6px 12px;border-radius:var(--r-badge);
  background:var(--accent-soft);color:var(--accent-text);font-size:12px;font-weight:600;line-height:1.6;
}

/* ---------- 导航 ---------- */
.site-header{
  position:sticky;top:16px;z-index:1030;
  padding:16px 0 0;background:transparent;
}
.nav-card{
  position:relative;
  display:flex;align-items:center;gap:16px;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--r-nav);
  box-shadow:var(--sh-2);
  padding:10px 14px;
  transition:box-shadow .2s ease,padding .2s ease;
}
.site-header.is-scrolled .nav-card{box-shadow:var(--sh-3);padding:6px 14px;}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0;}
.brand-mark{
  width:36px;height:36px;border-radius:10px;background:var(--brand-600);
  display:grid;place-items:center;color:#fff;flex-shrink:0;
}
.brand-mark svg{width:20px;height:20px;}
.brand-name{display:block;font-size:16px;font-weight:600;color:var(--brand-900);line-height:1.25;}
.brand-sub{display:block;font-size:11px;color:var(--muted);line-height:1.4;letter-spacing:.02em;}
.nav-panel{display:flex;align-items:center;gap:10px;margin-left:auto;}
.nav-chips{display:flex;align-items:center;gap:4px;}
.nav-chip{
  position:relative;display:inline-flex;align-items:center;gap:6px;
  padding:8px 10px;border-radius:12px;font-size:14px;color:var(--muted);line-height:1.4;
  transition:background-color .16s ease,color .16s ease;
}
.nav-chip svg{width:18px;height:18px;flex-shrink:0;stroke:currentColor;fill:none;stroke-width:1.75;}
.nav-chip:hover{background:var(--brand-100);color:var(--brand-700);}
.nav-chip.active{background:var(--brand-100);color:var(--brand-700);font-weight:600;}
.nav-chip.active::after{
  content:"";position:absolute;left:10px;right:10px;bottom:1px;height:2px;
  border-radius:2px;background:var(--accent);
}
.nav-actions{display:flex;align-items:center;gap:10px;}
.nav-toggle{
  display:none;width:44px;height:44px;border:1px solid var(--line);border-radius:12px;
  background:var(--surface);align-items:center;justify-content:center;flex-direction:column;gap:4px;
  cursor:pointer;margin-left:auto;padding:0;
}
.nav-toggle span{display:block;width:18px;height:2px;border-radius:2px;background:var(--brand-900);transition:transform .2s ease,opacity .2s ease;}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(6px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-6px) rotate(-45deg);}

/* ---------- Hero ---------- */
.hero{padding:72px 0 64px;}
.hero-grid{display:grid;grid-template-columns:7fr 5fr;gap:48px;align-items:center;}
.hero h1{
  font-size:40px;line-height:1.25;font-weight:700;color:var(--brand-900);
  margin:18px 0 16px;letter-spacing:0;
}
.hero-sub{
  font-size:16px;color:var(--muted);line-height:1.8;max-width:42ch;margin:0 0 26px;
}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:34px;}
.metrics{
  display:flex;flex-wrap:wrap;gap:0;
  border-top:1px solid var(--line);padding-top:22px;
}
.metric{padding-right:28px;margin-right:28px;border-right:1px solid var(--line);}
.metric:last-child{border-right:0;margin-right:0;padding-right:0;}
.metric-num{font-size:28px;font-weight:700;color:var(--brand-700);line-height:1.15;font-variant-numeric:tabular-nums;}
.metric-label{font-size:12px;color:var(--muted);line-height:1.5;margin-top:2px;}
.hero-visual{position:relative;}
.hero-visual::before{
  content:"";position:absolute;top:-22px;right:-18px;width:132px;height:132px;border-radius:12px;
  background-image:radial-gradient(var(--brand-600) 1.5px,transparent 1.5px);
  background-size:14px 14px;opacity:.12;pointer-events:none;
}
.hero-figure{
  position:relative;border-radius:var(--r-card);overflow:hidden;
  box-shadow:var(--sh-2);aspect-ratio:16/11;background:var(--brand-100);
}
.hero-figure img{width:100%;height:100%;object-fit:cover;}
.float-card{
  position:absolute;left:-18px;bottom:-22px;
  display:flex;gap:12px;align-items:flex-start;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-md);
  box-shadow:var(--sh-2);padding:14px 16px;max-width:268px;
}
.float-card .icon-sq{width:36px;height:36px;border-radius:10px;}
.float-card strong{display:block;font-size:14px;font-weight:600;color:var(--brand-900);line-height:1.4;}
.float-card span{display:block;font-size:12px;color:var(--muted);line-height:1.6;}

/* ---------- 通用板块 ---------- */
.section{padding:var(--sp-section) 0;}
.sec-head{max-width:660px;margin-bottom:40px;}
.sec-head h2{font-size:30px;font-weight:600;line-height:1.35;color:var(--brand-900);margin-bottom:12px;}
.sec-head p{font-size:15px;color:var(--muted);line-height:1.85;max-width:42ch;}
.sec-head-row{
  display:flex;align-items:flex-end;justify-content:space-between;gap:24px;
  flex-wrap:wrap;margin-bottom:40px;
}
.sec-head-row .sec-head{margin-bottom:0;}

/* ---------- 图标方块 ---------- */
.icon-sq{
  width:44px;height:44px;border-radius:12px;flex-shrink:0;
  background:var(--brand-100);color:var(--brand-700);
  display:grid;place-items:center;
}
.icon-sq svg{width:22px;height:22px;stroke:currentColor;fill:none;stroke-width:1.75;stroke-linecap:round;stroke-linejoin:round;}

/* ---------- 卖点 ---------- */
.value-grid{display:grid;grid-template-columns:5fr 7fr;gap:48px;align-items:start;}
.value-sticky{position:sticky;top:120px;}
.value-sticky h2{font-size:30px;line-height:1.35;margin-bottom:14px;}
.value-sticky p{font-size:15px;color:var(--muted);line-height:1.85;max-width:34ch;margin-bottom:20px;}
.value-list{display:flex;flex-direction:column;gap:20px;}
.value-card{
  display:flex;gap:18px;align-items:flex-start;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  box-shadow:var(--sh-1);padding:24px;
  transition:box-shadow .16s ease,transform .16s ease;
}
.value-card:hover{box-shadow:var(--sh-2);transform:translateY(-2px);}
.value-card h3{font-size:20px;font-weight:600;line-height:1.4;margin-bottom:6px;}
.value-card p{font-size:14px;color:var(--muted);line-height:1.75;margin-bottom:10px;}

/* ---------- 流程演示 ---------- */
.demo-grid{display:grid;grid-template-columns:6fr 6fr;gap:48px;align-items:start;}
.demo-figure{
  position:relative;border-radius:var(--r-card);overflow:hidden;
  box-shadow:var(--sh-2);aspect-ratio:4/3;background:var(--brand-100);
}
.demo-figure img{width:100%;height:100%;object-fit:cover;}
.demo-figure .corner{
  position:absolute;top:16px;left:16px;
  background:rgba(255,255,255,.94);color:var(--brand-900);
  font-size:12px;font-weight:600;padding:6px 12px;border-radius:var(--r-badge);
}
.steps{position:relative;margin-top:4px;}
.step{position:relative;padding-left:64px;padding-bottom:28px;}
.step:last-child{padding-bottom:0;}
.step::before{
  content:"";position:absolute;left:19px;top:40px;bottom:0;width:1px;background:var(--brand-100);
}
.step:last-child::before{display:none;}
.step-num{
  position:absolute;left:0;top:0;width:40px;height:40px;border-radius:50%;
  border:1.5px solid var(--brand-100);background:var(--surface);
  display:grid;place-items:center;font-size:13px;font-weight:700;color:var(--brand-700);
  font-variant-numeric:tabular-nums;
}
.step.is-active .step-num{background:var(--brand-600);border-color:var(--brand-600);color:#fff;}
.step h3{font-size:20px;font-weight:600;line-height:1.4;margin-bottom:6px;}
.step p{font-size:14px;color:var(--muted);line-height:1.75;max-width:38ch;}

/* ---------- 证据 ---------- */
.proof-bar{
  display:grid;grid-template-columns:repeat(4,1fr);
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  box-shadow:var(--sh-1);overflow:hidden;margin-bottom:32px;
}
.proof-item{padding:24px;border-right:1px solid rgba(14,42,61,.12);}
.proof-item:last-child{border-right:0;}
.proof-num{font-size:26px;font-weight:700;color:var(--brand-700);line-height:1.2;font-variant-numeric:tabular-nums;}
.proof-label{font-size:13px;color:var(--muted);line-height:1.6;margin-top:4px;}
.rail-wrap{position:relative;}
.rail{
  display:flex;gap:20px;overflow-x:auto;scroll-snap-type:x mandatory;
  padding-bottom:12px;scrollbar-width:thin;
}
.rail::-webkit-scrollbar{height:6px;}
.rail::-webkit-scrollbar-track{background:transparent;}
.rail::-webkit-scrollbar-thumb{background:var(--line);border-radius:3px;}
.quote-card{
  flex:0 0 328px;scroll-snap-align:start;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  box-shadow:var(--sh-1);padding:24px;display:flex;flex-direction:column;gap:14px;
}
.quote-card p{font-size:15px;line-height:1.8;color:var(--text);}
.quote-src{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--muted);margin-top:auto;}
.quote-dot{width:6px;height:6px;border-radius:50%;background:var(--accent);flex-shrink:0;}
.rail-nav{display:flex;gap:8px;justify-content:flex-end;margin-top:4px;}
.rail-btn{
  width:36px;height:36px;border-radius:50%;border:1px solid var(--line);background:var(--surface);
  color:var(--brand-700);display:grid;place-items:center;cursor:pointer;
  transition:background-color .16s ease,box-shadow .16s ease;
}
.rail-btn:hover{background:var(--brand-100);box-shadow:var(--sh-1);}
.rail-btn svg{width:16px;height:16px;stroke:currentColor;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;}

/* ---------- 最新信息 ---------- */
.news-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;}
.news-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  box-shadow:var(--sh-1);overflow:hidden;display:flex;flex-direction:column;
  transition:box-shadow .16s ease,transform .16s ease;
}
.news-card:hover{box-shadow:var(--sh-2);transform:translateY(-2px);}
.news-thumb{
  display:block;aspect-ratio:16/10;overflow:hidden;background:var(--brand-100);
}
.news-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .18s ease;}
.news-card:hover .news-thumb img{transform:scale(1.03);}
.news-body{padding:20px 22px 22px;display:flex;flex-direction:column;gap:10px;flex:1;}
.news-body .badge-soft{align-self:flex-start;}
.news-title{font-size:18px;font-weight:600;line-height:1.45;}
.news-title a{color:var(--brand-900);}
.news-title a:hover{color:var(--brand-700);}
.news-desc{
  font-size:14px;color:var(--muted);line-height:1.75;margin:0;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.news-meta{
  margin-top:auto;padding-top:12px;border-top:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  font-size:13px;color:var(--muted);
}
.news-meta .go{color:var(--brand-700);font-weight:600;display:inline-flex;align-items:center;gap:4px;}
.empty-card{
  min-height:200px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;
  background:var(--surface);border:1px dashed var(--line);border-radius:var(--r-card);
  box-shadow:var(--sh-1);padding:36px 24px;text-align:center;
}
.empty-card svg{width:40px;height:40px;stroke:var(--brand-600);fill:none;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round;opacity:.75;}
.empty-card strong{font-size:15px;color:var(--brand-900);font-weight:600;}
.empty-card span{font-size:12px;color:var(--muted);}

/* ---------- 价格 ---------- */
.price-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;align-items:stretch;}
.price-card{
  position:relative;display:flex;flex-direction:column;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  box-shadow:var(--sh-1);padding:28px 24px;
  transition:box-shadow .16s ease,transform .16s ease;
}
.price-card:hover{box-shadow:var(--sh-2);}
.price-card.featured{
  border:1.5px solid var(--brand-600);box-shadow:var(--sh-2);transform:translateY(-12px);
}
.price-card.featured:hover{transform:translateY(-14px);}
.price-tag{
  position:absolute;top:16px;right:16px;
  background:var(--accent-soft);color:var(--accent-text);
  font-size:12px;font-weight:600;padding:4px 10px;border-radius:var(--r-badge);
}
.price-card h3{font-size:20px;font-weight:600;margin-bottom:6px;}
.price-lead{font-size:13px;color:var(--muted);line-height:1.7;margin-bottom:18px;}
.price-amount{display:flex;align-items:baseline;gap:6px;}
.price-amount .num{font-size:32px;font-weight:700;color:var(--brand-900);line-height:1.1;font-variant-numeric:tabular-nums;}
.price-amount .unit{font-size:12px;color:var(--muted);}
.price-list{display:flex;flex-direction:column;gap:10px;margin:22px 0 26px;}
.price-list li{display:flex;gap:8px;align-items:flex-start;font-size:14px;color:var(--muted);line-height:1.7;}
.price-list svg{width:16px;height:16px;flex-shrink:0;margin-top:5px;stroke:var(--ok);fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;}
.price-card .btn{width:100%;margin-top:auto;}
.price-note{font-size:12px;color:var(--muted);text-align:center;margin-top:12px;line-height:1.7;}

/* ---------- FAQ ---------- */
.faq-wrap{max-width:820px;margin:0 auto;}
.accordion-item{
  background:var(--surface);border:1px solid var(--line);border-radius:16px;
  box-shadow:var(--sh-1);margin-bottom:10px;overflow:hidden;
}
.accordion-item:last-child{margin-bottom:0;}
.accordion-button{
  font-size:16px;font-weight:600;color:var(--brand-900);
  padding:20px 24px;background:var(--surface);box-shadow:none;line-height:1.6;
}
.accordion-button:not(.collapsed){
  background:var(--surface);color:var(--brand-700);box-shadow:inset 3px 0 0 var(--accent);
}
.accordion-button:focus{box-shadow:none;border-color:transparent;}
.accordion-button:not(.collapsed):focus{box-shadow:inset 3px 0 0 var(--accent);}
.accordion-button::after{
  width:14px;height:14px;background-size:14px;opacity:.6;
}
.accordion-body{padding:0 24px 22px;font-size:15px;color:var(--muted);line-height:1.85;}

/* ---------- 联系 ---------- */
.contact-grid{display:grid;grid-template-columns:5fr 7fr;gap:32px;align-items:start;}
.info-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  box-shadow:var(--sh-1);padding:28px 24px;
}
.info-card h2{font-size:22px;line-height:1.4;margin-bottom:10px;}
.info-card .lead{font-size:14px;color:var(--muted);line-height:1.8;margin-bottom:22px;}
.info-row{display:flex;gap:14px;align-items:flex-start;padding:14px 0;border-top:1px solid var(--line);}
.info-row:first-of-type{border-top:0;padding-top:0;}
.info-row .icon-sq{width:38px;height:38px;border-radius:10px;}
.info-row .icon-sq svg{width:19px;height:19px;}
.info-row strong{display:block;font-size:14px;font-weight:600;color:var(--brand-900);line-height:1.5;}
.info-row span{display:block;font-size:13px;color:var(--muted);line-height:1.7;}
.form-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  box-shadow:var(--sh-1);padding:28px 24px;
}
.form-card h3{font-size:20px;margin-bottom:6px;}
.form-card .form-lead{font-size:13px;color:var(--muted);line-height:1.7;margin-bottom:22px;}
.form-label{font-size:13px;font-weight:600;color:var(--brand-900);margin-bottom:6px;}
.form-control,.form-select{
  height:44px;border-radius:var(--r-xs);border:1px solid var(--line);
  font-size:15px;color:var(--text);padding:0 14px;background:var(--surface);
  box-shadow:none;
}
.form-control::placeholder{color:var(--muted);opacity:.85;}
.form-control:focus,.form-select:focus{
  border-color:var(--brand-600);box-shadow:0 0 0 3px var(--brand-100);background:var(--surface);
}
textarea.form-control{height:auto;min-height:122px;padding:12px 14px;line-height:1.75;resize:vertical;}
.form-actions{display:flex;align-items:center;gap:14px;justify-content:flex-end;flex-wrap:wrap;margin-top:6px;}
.form-hint{font-size:13px;color:var(--muted);line-height:1.6;}
.form-status{
  display:none;margin-top:16px;padding:12px 16px;border-radius:var(--r-xs);
  background:var(--brand-100);color:var(--brand-700);font-size:13px;line-height:1.7;
}
.form-status.show{display:block;}

/* ---------- 页脚 ---------- */
.site-footer{
  background:var(--brand-900);color:rgba(255,255,255,.72);
  padding:64px 0 28px;margin-top:0;
}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px;}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:16px;}
.footer-brand .brand-mark{background:rgba(255,255,255,.1);}
.footer-brand .brand-name{color:#fff;}
.footer-brand .brand-sub{color:rgba(255,255,255,.5);}
.site-footer p{font-size:14px;line-height:1.85;color:rgba(255,255,255,.62);max-width:36ch;}
.footer-col h4{font-size:14px;font-weight:600;color:#fff;margin-bottom:14px;letter-spacing:.02em;}
.footer-links{display:flex;flex-direction:column;gap:10px;}
.footer-links a{font-size:14px;color:rgba(255,255,255,.66);}
.footer-links a:hover{color:#fff;}
.footer-bottom{
  margin-top:44px;padding-top:22px;border-top:1px solid rgba(255,255,255,.12);
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:13px;color:rgba(255,255,255,.5);
}

/* ---------- 浮动 CTA ---------- */
.float-cta{
  position:fixed;right:24px;bottom:24px;z-index:1040;
  display:flex;align-items:center;gap:10px;
  opacity:0;visibility:hidden;transform:translateY(8px);
  transition:opacity .2s ease,transform .2s ease,visibility .2s ease;
}
.float-cta.is-visible{opacity:1;visibility:visible;transform:translateY(0);}
.float-btn{
  display:inline-flex;align-items:center;gap:8px;height:46px;padding:0 20px;
  border-radius:999px;background:var(--brand-600);color:#fff;
  font-size:14px;font-weight:600;box-shadow:var(--sh-2);
  transition:background-color .16s ease,box-shadow .16s ease,transform .16s ease;
}
.float-btn:hover{background:var(--brand-700);color:#fff;box-shadow:var(--sh-3);transform:translateY(-1px);}
.float-btn svg{width:18px;height:18px;stroke:currentColor;fill:none;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round;}
.float-top{
  width:44px;height:44px;border-radius:50%;border:1px solid var(--line);
  background:var(--surface);color:var(--brand-700);display:grid;place-items:center;
  box-shadow:var(--sh-2);cursor:pointer;transition:background-color .16s ease,box-shadow .16s ease;
}
.float-top:hover{background:var(--brand-100);}
.float-top svg{width:18px;height:18px;stroke:currentColor;fill:none;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;}
.float-cta.at-bottom .float-btn{display:none;}

/* ---------- Bootstrap 默认覆盖集中区 ---------- */
.btn:focus,.btn:active:focus,.btn.active:focus,.btn.focus,.btn:active.focus,.btn.active.focus{
  outline:2px solid var(--accent) !important;outline-offset:2px !important;box-shadow:none !important;
}
.accordion-button::after{background-image:url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%2316506E'%3e%3cpath fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3e%3c/svg%3e") !important;}
.accordion-button:not(.collapsed)::after{background-image:url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='%23C97A2B'%3e%3cpath fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/%3e%3c/svg%3e") !important;}

/* ---------- 响应式 ---------- */
@media (max-width:1199px){
  .hero h1{font-size:36px;}
  .value-grid,.demo-grid,.contact-grid{gap:36px;}
}
@media (max-width:991px){
  :root{--sp-section:64px;}
  .site-header{top:12px;padding-top:12px;}
  .nav-toggle{display:flex;}
  .nav-panel{
    display:none;position:absolute;top:calc(100% + 10px);left:0;right:0;
    flex-direction:column;align-items:stretch;gap:12px;
    background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
    box-shadow:var(--sh-3);padding:16px;margin-left:0;
  }
  .nav-panel.open{display:flex;}
  .nav-chips{display:grid;grid-template-columns:1fr 1fr;gap:8px;}
  .nav-chip{justify-content:flex-start;padding:12px 10px;}
  .nav-actions{flex-direction:column;align-items:stretch;}
  .nav-actions .btn{width:100%;}
  .hero{padding:40px 0 48px;}
  .hero-grid{grid-template-columns:1fr;gap:44px;}
  .hero h1{font-size:32px;}
  .hero-visual{max-width:560px;}
  .float-card{left:0;bottom:-18px;}
  .value-grid{grid-template-columns:1fr;gap:28px;}
  .value-sticky{position:static;}
  .demo-grid{grid-template-columns:1fr;gap:32px;}
  .demo-figure{max-width:560px;}
  .proof-bar{grid-template-columns:repeat(2,1fr);}
  .proof-item:nth-child(2){border-right:0;}
  .proof-item:nth-child(1),.proof-item:nth-child(2){border-bottom:1px solid rgba(14,42,61,.12);}
  .news-grid{grid-template-columns:repeat(2,1fr);}
  .price-grid{grid-template-columns:1fr;gap:20px;}
  .price-card.featured{transform:none;order:-1;}
  .price-card.featured:hover{transform:none;}
  .contact-grid{grid-template-columns:1fr;gap:24px;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
  .footer-grid > div:first-child{grid-column:1 / -1;}
  .rail-nav{display:none;}
}
@media (max-width:767px){
  :root{--sp-section:48px;}
  body{font-size:15.5px;padding-bottom:64px;}
  .hero h1{font-size:28px;}
  .sec-head h2,.value-sticky h2{font-size:22px;}
  .news-grid{grid-template-columns:1fr;}
  .hero-actions{flex-direction:column;align-items:stretch;}
  .hero-actions .btn{width:100%;}
  .float-cta{
    left:0;right:0;bottom:0;padding:8px 16px calc(8px + env(safe-area-inset-bottom));
    background:rgba(255,255,255,.96);border-top:1px solid var(--line);
    justify-content:center;gap:10px;transform:translateY(0);opacity:1;visibility:visible;
  }
  .float-cta.is-visible{transform:translateY(0);}
  .float-btn{flex:1;justify-content:center;height:44px;}
  .float-top{display:none;}
  .form-actions{justify-content:stretch;}
  .form-actions .btn{width:100%;}
  .footer-grid{grid-template-columns:1fr;}
  .footer-bottom{flex-direction:column;gap:8px;}
  .quote-card{flex:0 0 84%;}
  .value-card,.info-card,.form-card,.price-card{padding:20px 18px;}
  .news-body{padding:18px 18px 20px;}
}
@media (max-width:575px){
  .hero h1{font-size:26px;}
  .metrics{gap:16px 0;}
  .metric{padding-right:20px;margin-right:20px;}
  .metric:last-child{padding-right:0;margin-right:0;}
  .metric-num{font-size:24px;}
  .proof-item{padding:18px;}
  .nav-chips{grid-template-columns:1fr;}
  .demo-figure .corner{top:12px;left:12px;font-size:11px;padding:5px 10px;}
  .float-card{max-width:none;left:0;right:0;bottom:-16px;}
}

/* roulang page: article */
:root{
  --brand-600:#1E6B93;
  --brand-700:#16506E;
  --brand-900:#0E2A3D;
  --brand-100:#E3EEF4;
  --accent:#C97A2B;
  --accent-soft:#F6E7D3;
  --accent-deep:#8A5A20;
  --bg:#F7F9FA;
  --surface:#FFFFFF;
  --line:#E1E8ED;
  --text:#16202A;
  --muted:#5C6B77;
  --danger:#B4472F;
  --ok:#2E8B6E;
  --r-nav:20px;
  --r-card:18px;
  --r-img:14px;
  --r-badge:8px;
  --sh-1:0 1px 2px rgba(14,42,61,.05);
  --sh-2:0 8px 24px rgba(14,42,61,.08);
  --sh-3:0 18px 40px rgba(14,42,61,.12);
  --font-sans:system-ui,-apple-system,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
}

/* ===== Bootstrap 默认外观覆盖（集中） ===== */
:root{
  --bs-primary:#1E6B93;
  --bs-primary-rgb:30,107,147;
  --bs-body-font-family:var(--font-sans);
  --bs-body-color:#16202A;
  --bs-body-bg:#F7F9FA;
  --bs-border-radius:18px;
  --bs-border-color:#E1E8ED;
  --bs-link-color:#1E6B93;
  --bs-link-hover-color:#16506E;
}
.container{
  max-width:1160px !important;
  padding-left:20px !important;
  padding-right:20px !important;
}
.btn{
  --bs-btn-border-radius:999px;
  font-family:var(--font-sans);
  font-weight:600;
  transition:background-color .16s ease,color .16s ease,box-shadow .16s ease,transform .16s ease,border-color .16s ease;
}

/* ===== 基础 ===== */
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  min-height:100vh;
  display:flex;
  flex-direction:column;
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.8;
  color:var(--text);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
main{flex:1 0 auto;}
a{color:var(--brand-600);text-decoration:none;}
a:hover{color:var(--brand-700);}
img{max-width:100%;display:block;}
h1,h2,h3,h4{margin:0;color:var(--brand-900);letter-spacing:0;}
h1{font-size:40px;font-weight:700;line-height:1.25;}
h2{font-size:30px;font-weight:600;line-height:1.35;}
h3{font-size:20px;font-weight:600;line-height:1.45;}
h4{font-size:16px;font-weight:600;line-height:1.5;}
p{margin:0 0 18px;}
p:last-child{margin-bottom:0;}
ul,ol{margin:0;padding:0;}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:6px;}
[id]{scroll-margin-top:96px;}

/* ===== 按钮 ===== */
.btn-brand{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:46px;padding:0 22px;border:1px solid transparent;border-radius:999px;
  background:var(--brand-600);color:#fff;font-size:15px;font-weight:600;
  text-decoration:none;cursor:pointer;box-shadow:var(--sh-1);
}
.btn-brand:hover{background:var(--brand-700);color:#fff;box-shadow:var(--sh-2);transform:translateY(-1px);}
.btn-brand:active{transform:none;box-shadow:var(--sh-1);}
.btn-outline-brand{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:46px;padding:0 22px;border:1.5px solid var(--brand-600);border-radius:999px;
  background:transparent;color:var(--brand-700);font-size:15px;font-weight:600;
  text-decoration:none;cursor:pointer;
}
.btn-outline-brand:hover{background:var(--brand-100);color:var(--brand-700);transform:translateY(-1px);}
.btn-outline-brand:active{transform:none;}
.btn-sm{height:40px;padding:0 18px;font-size:14px;}
.btn-ghost{
  display:inline-flex;align-items:center;gap:6px;color:var(--brand-700);
  font-size:14px;font-weight:600;text-decoration:none;padding:6px 0;
}
.btn-ghost svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;transition:transform .16s ease;}
.btn-ghost:hover{text-decoration:underline;text-underline-offset:4px;color:var(--brand-700);}
.btn-ghost:hover svg{transform:translateX(3px);}

/* ===== 站点头部 ===== */
.site-header{
  position:sticky;top:16px;z-index:1030;margin-top:16px;
  transition:transform .18s ease;
}
.nav-card{
  position:relative;
  display:flex;align-items:center;gap:14px;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--r-nav);
  box-shadow:var(--sh-2);
  padding:10px 14px;
  transition:box-shadow .2s ease,padding .2s ease;
}
.site-header.scrolled .nav-card{box-shadow:var(--sh-3);padding:6px 14px;}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;flex:0 0 auto;}
.brand-mark{
  width:36px;height:36px;flex:0 0 36px;display:grid;place-items:center;
  border-radius:10px;background:var(--brand-600);color:#fff;
}
.brand-mark svg{width:20px;height:20px;}
.brand-text{display:flex;flex-direction:column;line-height:1.2;}
.brand-name{font-size:16px;font-weight:600;color:var(--brand-900);white-space:nowrap;}
.brand-sub{font-size:11px;color:var(--muted);letter-spacing:.2px;}
.nav-toggle{
  display:none;width:44px;height:44px;margin-left:auto;
  border:1px solid var(--line);border-radius:12px;background:var(--surface);
  align-items:center;justify-content:center;flex-direction:column;gap:4px;cursor:pointer;
}
.nav-toggle span{display:block;width:18px;height:2px;border-radius:2px;background:var(--brand-900);transition:transform .2s ease,opacity .2s ease;}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(6px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-6px) rotate(-45deg);}
.nav-panel{display:flex;align-items:center;gap:12px;margin-left:auto;}
.nav-chips{display:flex;align-items:center;gap:4px;list-style:none;}
.nav-chip{
  position:relative;display:inline-flex;align-items:center;gap:6px;
  padding:8px 10px;border-radius:12px;font-size:14px;color:var(--muted);
  text-decoration:none;transition:background-color .16s ease,color .16s ease;
}
.nav-chip svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.75;flex:0 0 18px;}
.nav-chip:hover{background:var(--brand-100);color:var(--brand-700);}
.nav-chip.active{background:var(--brand-100);color:var(--brand-700);font-weight:600;}
.nav-chip.active::after{
  content:"";position:absolute;left:10px;right:10px;bottom:3px;height:2px;
  border-radius:2px;background:var(--accent);
}
.nav-actions{display:flex;align-items:center;gap:10px;}

/* ===== 面包屑 ===== */
.crumb{margin:26px 0 18px;}
.crumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px;list-style:none;font-size:12px;color:var(--muted);}
.crumb a{color:var(--muted);}
.crumb a:hover{color:var(--brand-700);}
.crumb .sep{color:#B6C3CC;}
.crumb [aria-current="page"]{color:var(--brand-700);}

/* ===== 文章头部 ===== */
.article-head{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  box-shadow:var(--sh-1);padding:32px;
}
.head-top{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-bottom:16px;}
.badge-soft{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 12px;border-radius:var(--r-badge);
  background:var(--brand-100);color:var(--brand-700);
  font-size:12px;font-weight:600;
}
.badge-accent{
  display:inline-flex;align-items:center;
  padding:5px 12px;border-radius:var(--r-badge);
  background:var(--accent-soft);color:var(--accent-deep);
  font-size:12px;font-weight:600;
}
.article-title{font-size:34px;font-weight:700;line-height:1.32;color:var(--brand-900);}
.article-meta{
  display:flex;flex-wrap:wrap;align-items:center;gap:14px;
  margin-top:18px;font-size:13px;color:var(--muted);
}
.article-meta .dot{width:4px;height:4px;border-radius:50%;background:#C4D0D8;}
.article-cover{
  margin-top:24px;border-radius:16px;overflow:hidden;aspect-ratio:21/9;background:var(--brand-100);
}
.article-cover img{width:100%;height:100%;object-fit:cover;}

/* ===== 主体两栏 ===== */
.article-layout{
  display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:32px;
  align-items:start;margin-top:28px;
}
.article-body{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  box-shadow:var(--sh-1);padding:36px;min-width:0;
}
.article-body h2{
  position:relative;font-size:24px;font-weight:600;line-height:1.4;
  margin:38px 0 14px;padding-left:14px;color:var(--brand-900);
}
.article-body h2::before{
  content:"";position:absolute;left:0;top:6px;bottom:6px;width:4px;
  border-radius:2px;background:var(--accent);
}
.article-body h2:first-child{margin-top:0;}
.article-body h3{font-size:19px;font-weight:600;margin:26px 0 10px;color:var(--brand-900);}
.article-body h4{font-size:16px;font-weight:600;margin:20px 0 8px;color:var(--brand-700);}
.article-body p{font-size:16px;line-height:1.9;margin:0 0 18px;color:var(--text);}
.article-body a{color:var(--brand-600);text-decoration:underline;text-underline-offset:3px;}
.article-body strong{color:var(--brand-900);font-weight:600;}
.article-body ul,.article-body ol{padding-left:22px;margin:0 0 18px;}
.article-body li{margin-bottom:8px;line-height:1.85;}
.article-body blockquote{
  margin:24px 0;padding:16px 20px;background:var(--brand-100);
  border-left:3px solid var(--brand-600);border-radius:0 12px 12px 0;
  font-size:15px;line-height:1.85;color:var(--brand-900);font-style:normal;
}
.article-body blockquote p{margin:0;font-size:15px;color:var(--brand-900);}
.article-body table{width:100%;border-collapse:collapse;margin:24px 0;font-size:14px;}
.article-body th,.article-body td{padding:12px;border-bottom:1px solid var(--line);text-align:left;}
.article-body thead th{border-top:2px solid var(--brand-600);background:var(--brand-100);color:var(--brand-700);font-weight:600;}
.article-body tbody tr:nth-child(even){background:#FAFCFD;}
.article-body img{border-radius:12px;margin:16px 0;}
.article-body figure{margin:20px 0;}
.article-body figcaption{font-size:13px;color:var(--muted);text-align:center;margin-top:8px;}
.empty-state{text-align:center;padding:64px 24px;}
.empty-state h2{font-size:22px;margin-bottom:12px;padding-left:0;}
.empty-state h2::before{display:none;}
.empty-state p{color:var(--muted);margin-bottom:22px;}

/* ===== 目录 ===== */
.toc-card{
  position:sticky;top:96px;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  box-shadow:var(--sh-1);padding:20px;
}
.toc-card h4{
  display:flex;align-items:center;gap:8px;font-size:13px;font-weight:600;
  color:var(--muted);text-transform:none;letter-spacing:.4px;margin-bottom:12px;
}
.toc-card h4 svg{width:16px;height:16px;fill:none;stroke:var(--brand-600);stroke-width:1.75;}
.toc-list{list-style:none;display:flex;flex-direction:column;gap:2px;}
.toc-list a{
  display:block;padding:7px 10px;font-size:13px;line-height:1.6;color:var(--muted);
  border-left:3px solid transparent;border-radius:0 8px 8px 0;
  transition:background-color .16s ease,color .16s ease,border-color .16s ease;
  overflow:hidden;text-overflow:ellipsis;white-space:nowrap;
}
.toc-list a:hover{background:var(--brand-100);color:var(--brand-700);}
.toc-list a.active{border-left-color:var(--accent);background:var(--brand-100);color:var(--brand-700);font-weight:600;}
.toc-mobile{display:none;margin-top:24px;}

/* ===== 标签 ===== */
.tag-block{margin-top:28px;}
.tag-block h3{font-size:15px;font-weight:600;color:var(--muted);margin-bottom:12px;}
.tag-list{display:flex;flex-wrap:wrap;gap:8px;list-style:none;}
.tag{
  display:inline-flex;align-items:center;padding:6px 14px;border-radius:var(--r-badge);
  background:var(--surface);border:1px solid var(--line);color:var(--brand-700);
  font-size:13px;transition:background-color .16s ease,border-color .16s ease,transform .16s ease;
}
.tag:hover{background:var(--brand-100);border-color:var(--brand-100);transform:translateY(-1px);color:var(--brand-700);}

/* ===== 相关推荐 ===== */
.section{margin-top:56px;}
.section-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:12px;margin-bottom:24px;}
.section-head h2{font-size:24px;}
.section-head p{font-size:14px;color:var(--muted);margin:6px 0 0;}
.card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;}
.rel-card{
  display:flex;flex-direction:column;overflow:hidden;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  box-shadow:var(--sh-1);text-decoration:none;color:inherit;
  transition:box-shadow .16s ease,transform .16s ease,border-color .16s ease;
}
.rel-card:hover{box-shadow:var(--sh-2);transform:translateY(-2px);color:inherit;}
.rel-thumb{aspect-ratio:16/10;overflow:hidden;background:var(--brand-100);}
.rel-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .18s ease;}
.rel-card:hover .rel-thumb img{transform:scale(1.03);}
.rel-body{padding:20px;display:flex;flex-direction:column;gap:10px;flex:1;}
.rel-body h3{font-size:17px;line-height:1.5;color:var(--brand-900);}
.rel-card:hover .rel-body h3{color:var(--brand-700);}
.rel-body p{font-size:14px;line-height:1.75;color:var(--muted);margin:0;}
.rel-more{display:inline-flex;align-items:center;gap:6px;margin-top:auto;padding-top:6px;font-size:13px;font-weight:600;color:var(--brand-700);}
.rel-more svg{width:15px;height:15px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;transition:transform .16s ease;}
.rel-card:hover .rel-more svg{transform:translateX(3px);}

/* ===== 翻页 ===== */
.pager{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:28px;}
.pager a{
  display:flex;flex-direction:column;gap:6px;padding:20px 22px;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  box-shadow:var(--sh-1);color:inherit;text-decoration:none;
  transition:box-shadow .16s ease,transform .16s ease;
}
.pager a:hover{box-shadow:var(--sh-2);transform:translateY(-2px);color:inherit;}
.pager .pager-label{font-size:12px;color:var(--muted);}
.pager .pager-title{font-size:15px;font-weight:600;color:var(--brand-900);}
.pager .pager-sub{font-size:13px;color:var(--muted);}
.pager .align-end{text-align:right;align-items:flex-end;}

/* ===== CTA ===== */
.cta-card{
  margin-top:48px;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:24px;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
  box-shadow:var(--sh-2);padding:32px;
}
.cta-card h2{font-size:22px;margin-bottom:8px;}
.cta-card p{font-size:14px;color:var(--muted);margin:0;max-width:560px;}
.cta-actions{display:flex;flex-wrap:wrap;gap:12px;}

/* ===== 页脚 ===== */
.site-footer{
  margin-top:88px;background:var(--brand-900);color:#C9D6DE;padding:64px 0 28px;flex:0 0 auto;
}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:40px;}
.footer-brand{display:inline-flex;align-items:center;gap:10px;margin-bottom:16px;}
.footer-brand .brand-mark{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.16);color:#fff;}
.footer-brand .brand-name{color:#fff;font-size:16px;font-weight:600;}
.footer-brand .brand-sub{color:#8FA6B4;font-size:11px;}
.site-footer p{font-size:14px;line-height:1.8;color:#9FB4C1;max-width:380px;}
.footer-col h4{color:#fff;font-size:14px;font-weight:600;margin-bottom:16px;}
.footer-links{display:flex;flex-direction:column;gap:10px;}
.footer-links a{color:#9FB4C1;font-size:14px;transition:color .16s ease;}
.footer-links a:hover{color:#fff;}
.footer-bottom{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;
  margin-top:44px;padding-top:22px;border-top:1px solid rgba(255,255,255,.12);
  font-size:12px;color:#8FA6B4;
}

/* ===== 浮动 CTA ===== */
.float-cta{
  position:fixed;right:24px;bottom:24px;z-index:1020;
  display:inline-flex;align-items:center;gap:8px;
  height:48px;padding:0 20px;border-radius:999px;
  background:var(--brand-600);color:#fff;font-size:14px;font-weight:600;
  box-shadow:var(--sh-3);text-decoration:none;
  opacity:0;transform:translateY(8px);pointer-events:none;
  transition:opacity .2s ease,transform .2s ease,background-color .16s ease;
}
.float-cta svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.75;stroke-linecap:round;stroke-linejoin:round;}
.float-cta.show{opacity:1;transform:none;pointer-events:auto;}
.float-cta:hover{background:var(--brand-700);color:#fff;}
.float-cta.to-top{width:48px;height:48px;padding:0;justify-content:center;background:var(--brand-900);}
.float-cta.to-top span{display:none;}

/* ===== 响应式 ===== */
@media (max-width:1199.98px){
  .article-layout{grid-template-columns:minmax(0,1fr) 240px;gap:24px;}
}
@media (max-width:991.98px){
  h1{font-size:30px;}
  .article-title{font-size:28px;}
  .nav-toggle{display:inline-flex;}
  .nav-panel{
    position:absolute;left:0;right:0;top:calc(100% + 10px);
    display:none;flex-direction:column;align-items:stretch;gap:12px;
    background:var(--surface);border:1px solid var(--line);border-radius:var(--r-card);
    box-shadow:var(--sh-3);padding:14px;
  }
  .nav-panel.open{display:flex;}
  .nav-chips{display:grid;grid-template-columns:1fr 1fr;gap:8px;}
  .nav-chip{padding:10px;background:var(--bg);font-size:13px;}
  .nav-chip.active::after{display:none;}
  .nav-actions{justify-content:stretch;}
  .nav-actions .btn{width:100%;}
  .article-layout{grid-template-columns:minmax(0,1fr);}
  .article-head{padding:24px;}
  .article-body{padding:26px;}
  .toc-card{position:static;}
  .toc-desktop{display:none;}
  .toc-mobile{display:block;}
  .toc-mobile summary{
    display:flex;align-items:center;gap:8px;cursor:pointer;
    font-size:14px;font-weight:600;color:var(--brand-700);list-style:none;padding:4px 0;
  }
  .toc-mobile summary::-webkit-details-marker{display:none;}
  .toc-mobile[open] summary{margin-bottom:12px;}
  .card-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
  .footer-grid > div:first-child{grid-column:1 / -1;}
  .section{margin-top:44px;}
  .site-header{top:8px;margin-top:8px;}
  [id]{scroll-margin-top:80px;}
}
@media (max-width:767.98px){
  body{padding-bottom:72px;}
  .btn-brand,.btn-outline-brand{height:44px;}
  .article-title{font-size:24px;}
  .article-body h2{font-size:21px;margin-top:30px;}
  .article-body h3{font-size:18px;}
  .article-body p{font-size:15.5px;}
  .article-meta{gap:10px;font-size:12px;}
  .card-grid{grid-template-columns:minmax(0,1fr);}
  .pager{grid-template-columns:minmax(0,1fr);}
  .pager .align-end{text-align:left;align-items:flex-start;}
  .cta-card{padding:24px;}
  .cta-actions{width:100%;}
  .cta-actions .btn-brand,.cta-actions .btn-outline-brand{width:100%;}
  .site-footer{margin-top:56px;padding:44px 0 24px;}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:28px;}
  .footer-bottom{flex-direction:column;gap:8px;}
  .float-cta{
    left:0;right:0;bottom:0;width:100%;height:56px;border-radius:0;
    justify-content:center;padding:0 16px calc(0px + env(safe-area-inset-bottom));
    box-shadow:0 -6px 18px rgba(14,42,61,.14);
  }
  .float-cta.to-top{left:auto;right:16px;bottom:16px;width:48px;height:48px;border-radius:999px;}
}
@media (max-width:575.98px){
  .article-head{padding:20px;}
  .article-body{padding:18px;}
  .brand-name{font-size:15px;}
}

/* roulang page: category1 */
:root{
  --brand-600:#1E6B93;
  --brand-700:#16506E;
  --brand-900:#0E2A3D;
  --brand-100:#E3EEF4;
  --accent:#C97A2B;
  --accent-soft:#F6E7D3;
  --bg:#F7F9FA;
  --surface:#FFFFFF;
  --line:#E1E8ED;
  --text:#16202A;
  --muted:#5C6B77;
  --danger:#B4472F;
  --ok:#2E8B6E;
  --font:system-ui,-apple-system,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  --r-nav:20px;
  --r-lg:18px;
  --r-md:14px;
  --r-sm:10px;
  --r-badge:8px;
  --sh-1:0 1px 2px rgba(14,42,61,.05);
  --sh-2:0 8px 24px rgba(14,42,61,.08);
  --sh-3:0 18px 40px rgba(14,42,61,.12);
  --bs-primary:#1E6B93;
  --bs-primary-rgb:30,107,147;
  --bs-body-font-family:var(--font);
  --bs-body-color:#16202A;
  --bs-body-bg:#F7F9FA;
  --bs-border-radius:14px;
  --bs-link-color:#16506E;
  --bs-link-hover-color:#1E6B93;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;font-family:var(--font);font-size:16px;line-height:1.8;color:var(--text);
  background:var(--bg);-webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;height:auto}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4,p,ul,ol,figure{margin:0}
ul,ol{padding:0;list-style:none}
button{font-family:inherit}
a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{
  outline:2px solid var(--accent);outline-offset:2px;border-radius:var(--r-sm);
}
.container{width:100%;max-width:1160px;margin:0 auto;padding:0 20px}
[id]{scroll-margin-top:96px}

/* ===== Bootstrap 组件重塑（集中覆盖） ===== */
.btn{
  --bs-btn-font-family:var(--font);
  --bs-btn-font-weight:600;
  --bs-btn-border-radius:999px;
  --bs-btn-padding-y:0;
  --bs-btn-padding-x:22px;
  --bs-btn-font-size:15px;
  min-height:46px;display:inline-flex;align-items:center;justify-content:center;gap:8px;
  transition:background-color .16s ease,color .16s ease,border-color .16s ease,box-shadow .16s ease,transform .16s ease;
}
.btn-brand{
  --bs-btn-bg:#1E6B93;--bs-btn-border-color:#1E6B93;
  --bs-btn-color:#fff;--bs-btn-hover-bg:#16506E;--bs-btn-hover-border-color:#16506E;
  --bs-btn-active-bg:#16506E;--bs-btn-active-border-color:#16506E;
  --bs-btn-hover-color:#fff;--bs-btn-active-color:#fff;
  box-shadow:0 1px 2px rgba(14,42,61,.08);
}
.btn-brand:hover{box-shadow:var(--sh-2);transform:translateY(-1px)}
.btn-brand:active{transform:none;box-shadow:none}
.btn-outline-brand{
  --bs-btn-color:#16506E;--bs-btn-border-color:#1E6B93;--bs-btn-bg:transparent;
  --bs-btn-hover-bg:#E3EEF4;--bs-btn-hover-color:#16506E;--bs-btn-hover-border-color:#1E6B93;
  --bs-btn-active-bg:#E3EEF4;--bs-btn-active-color:#16506E;--bs-btn-active-border-color:#1E6B93;
  border-width:1.5px;
}
.btn-sm{min-height:38px;--bs-btn-font-size:14px;--bs-btn-padding-x:16px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--sh-1)}

/* ===== 导航 ===== */
.site-header{position:sticky;top:16px;z-index:900;padding-top:16px}
.nav-card{
  display:flex;align-items:center;gap:18px;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-nav);
  box-shadow:var(--sh-2);padding:10px 14px;
  transition:box-shadow .2s ease,padding .2s ease;
}
.site-header.is-scrolled .nav-card{box-shadow:var(--sh-3);padding-top:6px;padding-bottom:6px}
.brand{display:flex;align-items:center;gap:12px;flex-shrink:0;min-height:44px}
.brand-mark{
  width:36px;height:36px;flex:0 0 36px;border-radius:10px;background:var(--brand-600);
  color:#fff;display:grid;place-items:center;
}
.brand-mark svg{width:20px;height:20px}
.brand-text{display:flex;flex-direction:column;line-height:1.2}
.brand-name{font-size:16px;font-weight:600;color:var(--brand-900);letter-spacing:0}
.brand-sub{font-size:11px;color:var(--muted);margin-top:3px}
.nav-toggle{
  display:none;margin-left:auto;width:44px;height:44px;border:1px solid var(--line);
  background:var(--surface);border-radius:12px;padding:0;cursor:pointer;
  flex-direction:column;align-items:center;justify-content:center;gap:4px;
}
.nav-toggle span{display:block;width:18px;height:2px;background:var(--brand-900);border-radius:2px;transition:transform .2s ease,opacity .2s ease}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.nav-panel{display:flex;align-items:center;gap:18px;margin-left:auto;flex:1;justify-content:flex-end}
.nav-chips{display:flex;align-items:center;gap:6px;margin:0}
.nav-chip{
  position:relative;display:inline-flex;align-items:center;gap:7px;
  padding:9px 11px;border-radius:12px;font-size:14px;color:#3D4C58;
  transition:background-color .16s ease,color .16s ease;
}
.nav-chip svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.75;flex:0 0 18px}
.nav-chip:hover{background:var(--brand-100);color:var(--brand-700)}
.nav-chip.active{background:var(--brand-100);color:var(--brand-700);font-weight:600}
.nav-chip.active::after{
  content:"";position:absolute;left:11px;right:11px;bottom:3px;height:2px;
  background:var(--accent);border-radius:2px;
}
.nav-actions{display:flex;align-items:center;gap:14px}

/* ===== 通用区块 ===== */
main{padding-bottom:24px}
.section{padding:56px 0}
.section-tight{padding:36px 0}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;font-size:12px;font-weight:600;
  color:var(--brand-700);background:var(--brand-100);border-radius:var(--r-badge);
  padding:6px 12px;line-height:1.4;
}
.eyebrow.accent{background:var(--accent-soft);color:#8A5A20}
h1{font-size:40px;line-height:1.25;font-weight:700;letter-spacing:0;color:var(--brand-900)}
h2{font-size:30px;line-height:1.35;font-weight:600;letter-spacing:0;color:var(--brand-900)}
h3{font-size:20px;line-height:1.5;font-weight:600;color:var(--brand-900)}
h4{font-size:16px;line-height:1.5;font-weight:600;color:var(--brand-900)}
p{color:var(--text)}
.lead{color:var(--muted);font-size:16px;line-height:1.8;max-width:42em}
.muted{color:var(--muted)}

/* ===== 页头卡 ===== */
.page-hero{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  box-shadow:var(--sh-1);padding:32px;margin-top:24px;
  display:grid;grid-template-columns:1.55fr .95fr;gap:32px;align-items:center;
}
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:12px;color:var(--muted);margin-bottom:18px}
.breadcrumb li{display:inline-flex;align-items:center;gap:8px}
.breadcrumb li+li::before{content:"›";color:#A9B7C1}
.breadcrumb a{color:var(--muted)}
.breadcrumb a:hover{color:var(--brand-700)}
.breadcrumb [aria-current]{color:var(--text);font-weight:600}
.page-hero h1{margin:14px 0 16px;font-size:36px}
.page-hero .lead{max-width:40em}
.hero-meta{display:flex;flex-wrap:wrap;gap:10px 22px;margin-top:22px;font-size:13px;color:var(--muted)}
.hero-meta span{display:inline-flex;align-items:center;gap:7px}
.hero-meta svg{width:16px;height:16px;fill:none;stroke:var(--brand-600);stroke-width:1.75}
.hero-figure{position:relative}
.hero-figure img{
  width:100%;aspect-ratio:16/11;object-fit:cover;border-radius:var(--r-lg);
  border:1px solid var(--line);
}
.hero-tag{
  position:absolute;left:16px;bottom:16px;background:rgba(255,255,255,.96);
  border:1px solid var(--line);border-radius:var(--r-md);box-shadow:var(--sh-2);
  padding:10px 14px;display:flex;align-items:center;gap:10px;
}
.hero-tag svg{width:20px;height:20px;fill:none;stroke:var(--brand-600);stroke-width:1.75}
.hero-tag strong{display:block;font-size:13px;color:var(--brand-900);line-height:1.4}
.hero-tag span{display:block;font-size:12px;color:var(--muted);line-height:1.4}

/* ===== 主体：左目录 + 右条目卡 ===== */
.layout{display:grid;grid-template-columns:260px minmax(0,1fr);gap:24px;align-items:start;margin-top:32px}
.toc-card{
  position:sticky;top:112px;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-lg);box-shadow:var(--sh-1);padding:22px;
}
.toc-title{font-size:12px;font-weight:600;color:var(--muted);margin-bottom:12px}
.toc-list{display:flex;flex-direction:column;gap:4px;margin:0}
.toc-link{
  display:block;padding:9px 12px;border-radius:8px;font-size:14px;line-height:1.5;
  color:var(--muted);border-left:3px solid transparent;transition:background-color .16s ease,color .16s ease;
}
.toc-link:hover{background:var(--brand-100);color:var(--brand-700)}
.toc-link.active{background:var(--brand-100);color:var(--brand-700);border-left-color:var(--accent);font-weight:600}
.toc-note{margin-top:16px;padding-top:16px;border-top:1px solid var(--line);font-size:12px;line-height:1.7;color:var(--muted)}

.list-head{margin-bottom:20px}
.list-head h2{font-size:22px;margin:12px 0 8px}
.list-head p{font-size:14px;color:var(--muted);line-height:1.75;max-width:44em}

.entry-list{display:flex;flex-direction:column;gap:20px;margin:0}
.entry-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  box-shadow:var(--sh-1);overflow:hidden;transition:transform .16s ease,box-shadow .16s ease;
}
.entry-card:hover,.entry-card:focus-within{transform:translateY(-2px);box-shadow:var(--sh-2)}
.entry-link{display:grid;grid-template-columns:236px minmax(0,1fr);align-items:stretch}
.entry-thumb{position:relative;min-height:176px;background:var(--brand-100);overflow:hidden}
.entry-thumb img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .2s ease}
.entry-card:hover .entry-thumb img{transform:scale(1.03)}
.entry-num{
  position:absolute;top:12px;left:12px;background:rgba(255,255,255,.95);
  color:var(--brand-700);font-size:12px;font-weight:700;letter-spacing:.02em;
  border-radius:var(--r-badge);padding:4px 9px;border:1px solid rgba(30,107,147,.18);
}
.entry-body{padding:22px 24px;display:flex;flex-direction:column;gap:8px}
.entry-body h3{font-size:19px}
.entry-body p{font-size:14px;line-height:1.75;color:var(--muted);
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.text-arrow{
  display:inline-flex;align-items:center;gap:6px;margin-top:auto;padding-top:6px;
  font-size:14px;font-weight:600;color:var(--brand-700);
}
.text-arrow svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:2;transition:transform .16s ease}
.entry-card:hover .text-arrow svg{transform:translateX(3px)}

/* ===== 适用情形 ===== */
.grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
.info-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  box-shadow:var(--sh-1);padding:24px;transition:transform .16s ease,box-shadow .16s ease;
}
.info-card:hover{transform:translateY(-2px);box-shadow:var(--sh-2)}
.icon-box{
  width:44px;height:44px;border-radius:12px;background:var(--brand-100);color:var(--brand-700);
  display:grid;place-items:center;margin-bottom:16px;
}
.icon-box svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.75}
.info-card h3{font-size:18px;margin-bottom:8px}
.info-card p{font-size:14px;line-height:1.8;color:var(--muted);max-width:38em}

/* ===== 流程 ===== */
.flow-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px;margin-top:28px}
.flow-card{
  position:relative;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  box-shadow:var(--sh-1);padding:24px;transition:transform .16s ease,box-shadow .16s ease;
}
.flow-card:hover{transform:translateY(-2px);box-shadow:var(--sh-2)}
.flow-num{
  width:40px;height:40px;border-radius:999px;border:1px solid var(--brand-100);
  color:var(--brand-700);display:grid;place-items:center;font-size:14px;font-weight:700;
  margin-bottom:14px;background:#fff;
}
.flow-card.is-current .flow-num{background:var(--brand-600);color:#fff;border-color:var(--brand-600)}
.flow-card h3{font-size:17px;margin-bottom:8px}
.flow-card p{font-size:14px;line-height:1.75;color:var(--muted)}

/* ===== FAQ ===== */
.faq-wrap{max-width:820px;margin:0 auto}
.faq-list{display:flex;flex-direction:column;gap:10px;margin-top:24px}
.faq-item{
  background:var(--surface);border:1px solid var(--line);border-radius:16px;
  box-shadow:var(--sh-1);overflow:hidden;transition:box-shadow .16s ease;
}
.faq-item.is-open{box-shadow:var(--sh-2);border-left:3px solid var(--accent)}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  background:transparent;border:0;text-align:left;padding:18px 20px;cursor:pointer;
  font-size:16px;font-weight:600;color:var(--brand-900);line-height:1.5;
}
.faq-q .chev{width:20px;height:20px;flex:0 0 20px;fill:none;stroke:var(--brand-600);stroke-width:2;transition:transform .2s ease}
.faq-item.is-open .faq-q .chev{transform:rotate(180deg)}
.faq-a{display:grid;grid-template-rows:0fr;transition:grid-template-rows .26s ease}
.faq-item.is-open .faq-a{grid-template-rows:1fr}
.faq-a > div{overflow:hidden}
.faq-a p{padding:0 20px 20px;font-size:15px;line-height:1.85;color:var(--muted)}

/* ===== CTA 横向卡 ===== */
.cta-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  box-shadow:var(--sh-1);padding:28px 32px;display:flex;align-items:center;
  justify-content:space-between;gap:24px;flex-wrap:wrap;
}
.cta-card h2{font-size:24px;margin-bottom:6px}
.cta-card p{font-size:14px;color:var(--muted);line-height:1.75;max-width:36em}
.cta-actions{display:flex;gap:12px;flex-wrap:wrap}

/* ===== 浮动 CTA ===== */
.float-cta{
  position:fixed;right:24px;bottom:24px;z-index:800;
  display:inline-flex;align-items:center;gap:8px;height:46px;padding:0 20px;
  background:var(--brand-600);color:#fff;border-radius:999px;box-shadow:var(--sh-2);
  font-size:14px;font-weight:600;opacity:0;transform:translateY(8px);
  pointer-events:none;transition:opacity .2s ease,transform .2s ease,background-color .16s ease;
}
.float-cta.is-visible{opacity:1;transform:none;pointer-events:auto}
.float-cta:hover{background:var(--brand-700);box-shadow:var(--sh-3)}
.float-cta svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.9}

/* ===== 页脚 ===== */
.site-footer{background:var(--brand-900);color:#D7E3EA;margin-top:56px;padding:56px 0 24px}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:40px}
.footer-brand{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.footer-brand .brand-mark{background:rgba(255,255,255,.12);color:#fff}
.footer-brand .brand-name{color:#fff}
.footer-brand .brand-sub{color:#9FB6C4}
.site-footer p{font-size:14px;line-height:1.8;color:#9FB6C4;max-width:34em}
.footer-col h4{color:#fff;font-size:15px;margin-bottom:14px}
.footer-links{display:flex;flex-direction:column;gap:10px}
.footer-links a{font-size:14px;color:#9FB6C4;transition:color .16s ease}
.footer-links a:hover{color:#fff}
.footer-bottom{
  margin-top:36px;padding-top:20px;border-top:1px solid rgba(255,255,255,.12);
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13px;color:#8FA7B6;
}

/* ===== 响应式 ===== */
@media (max-width:1199px){
  .flow-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:991px){
  .nav-toggle{display:flex}
  .nav-panel{
    position:absolute;top:calc(100% + 10px);left:0;right:0;display:none;
    flex-direction:column;align-items:stretch;gap:12px;margin:0;
    background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
    box-shadow:var(--sh-3);padding:14px;
  }
  .nav-panel.is-open{display:flex}
  .nav-chips{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;width:100%}
  .nav-chip{justify-content:flex-start;width:100%;padding:11px 12px}
  .nav-actions{width:100%}
  .nav-actions .btn{width:100%}
  .nav-card{position:relative}
  .page-hero{grid-template-columns:1fr;gap:24px;padding:26px}
  .page-hero h1{font-size:30px}
  .layout{grid-template-columns:1fr}
  .toc-card{position:static;padding:18px}
  .toc-list{flex-direction:row;overflow-x:auto;gap:8px;padding-bottom:4px;scrollbar-width:thin}
  .toc-link{white-space:nowrap;border-left:0;border-bottom:3px solid transparent;border-radius:8px}
  .toc-link.active{border-left:0;border-bottom-color:var(--accent)}
  .toc-note{display:none}
  .section{padding:48px 0}
  h2{font-size:24px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .site-footer{padding-top:44px}
}
@media (max-width:767px){
  body{font-size:15.5px;padding-bottom:64px}
  [id]{scroll-margin-top:80px}
  h1{font-size:28px}
  .page-hero h1{font-size:26px}
  .page-hero{padding:22px;margin-top:16px}
  .entry-link{grid-template-columns:1fr}
  .entry-thumb{min-height:170px;aspect-ratio:16/10}
  .entry-body{padding:18px}
  .grid-2{grid-template-columns:1fr;gap:16px}
  .flow-grid{grid-template-columns:1fr;gap:16px}
  .cta-card{padding:22px;flex-direction:column;align-items:flex-start}
  .cta-actions{width:100%}
  .cta-actions .btn{width:100%}
  .float-cta{
    left:0;right:0;bottom:0;height:56px;border-radius:0;justify-content:center;
    padding:0 16px calc(0px + env(safe-area-inset-bottom));
  }
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer-bottom{flex-direction:column;gap:8px}
}
@media (max-width:575px){
  .container{padding:0 16px}
  .nav-card{padding:8px 10px}
  .brand-name{font-size:15px}
  .info-card,.flow-card{padding:18px}
  .section{padding:40px 0}
  .faq-q{font-size:15px;padding:16px}
  .faq-a p{padding:0 16px 18px}
}

/* roulang page: category2 */
:root{
  --brand-600:#1E6B93;
  --brand-700:#16506E;
  --brand-900:#0E2A3D;
  --brand-100:#E3EEF4;
  --accent:#C97A2B;
  --accent-strong:#B96A22;
  --accent-soft:#F6E7D3;
  --accent-text:#8A5A20;
  --bg:#F7F9FA;
  --surface:#FFFFFF;
  --line:#E1E8ED;
  --line-strong:#CFDDE6;
  --text:#16202A;
  --muted:#5C6B77;
  --warn:#B4472F;
  --ok:#2E8B6E;
  --r-lg:18px;
  --r-md:14px;
  --r-sm:10px;
  --sh-1:0 1px 2px rgba(14,42,61,.05);
  --sh-2:0 8px 24px rgba(14,42,61,.08);
  --sh-3:0 18px 40px rgba(14,42,61,.12);
  --font:system-ui,-apple-system,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
}
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{
  margin:0;
  font-family:var(--font);
  font-size:16px;
  line-height:1.8;
  color:var(--text);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%;}
a{color:var(--brand-700);text-decoration:none;transition:color .16s ease;}
a:hover{color:var(--brand-600);}
button{font-family:inherit;}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px;}
h1,h2,h3,h4{margin:0;color:var(--brand-900);letter-spacing:0;}
h1{font-size:40px;line-height:1.25;font-weight:700;}
h2{font-size:30px;line-height:1.35;font-weight:600;}
h3{font-size:20px;line-height:1.5;font-weight:600;}
h4{font-size:16px;line-height:1.6;font-weight:600;}
p{margin:0;}
ul,ol{margin:0;padding:0;list-style:none;}
.container{width:100%;max-width:1160px;margin:0 auto;padding:0 20px;}
.section{padding:64px 0;}
.section-tight{padding:48px 0;}
[id]{scroll-margin-top:96px;}

/* ---------- 导航 ---------- */
.site-header{position:sticky;top:0;z-index:1030;padding:12px 0;transition:padding .2s ease;}
.nav-card{
  position:relative;
  display:flex;
  align-items:center;
  gap:16px;
  padding:10px 14px;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:20px;
  box-shadow:var(--sh-2);
  transition:box-shadow .2s ease,padding .2s ease;
}
.site-header.is-scrolled .nav-card{box-shadow:var(--sh-3);padding:6px 14px;}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0;}
.brand-mark{
  width:36px;height:36px;flex:0 0 36px;
  display:inline-flex;align-items:center;justify-content:center;
  background:var(--brand-600);
  color:#fff;
  border-radius:10px;
}
.brand-mark svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.75;stroke-linecap:round;stroke-linejoin:round;}
.brand-text{display:flex;flex-direction:column;line-height:1.25;}
.brand-name{font-size:16px;font-weight:600;color:var(--brand-900);letter-spacing:0;}
.brand-sub{font-size:11px;color:var(--muted);}
.nav-panel{display:flex;align-items:center;gap:20px;margin-left:auto;}
.nav-chips{display:flex;align-items:center;gap:6px;}
.nav-chip{
  position:relative;
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 10px;
  border-radius:12px;
  font-size:14px;
  color:var(--text);
  white-space:nowrap;
  transition:background .16s ease,color .16s ease;
}
.nav-chip svg{width:18px;height:18px;flex:0 0 18px;fill:none;stroke:currentColor;stroke-width:1.75;stroke-linecap:round;stroke-linejoin:round;}
.nav-chip:hover{background:var(--brand-100);color:var(--brand-700);}
.nav-chip.active{background:var(--brand-100);color:var(--brand-700);font-weight:600;}
.nav-chip.active::after{
  content:"";position:absolute;left:10px;right:10px;bottom:2px;height:2px;
  background:var(--accent);border-radius:2px;
}
.nav-actions{display:flex;align-items:center;gap:12px;}
.nav-toggle{
  display:none;flex-direction:column;justify-content:center;gap:5px;
  width:44px;height:44px;padding:0 10px;
  background:transparent;border:1px solid var(--line);border-radius:12px;
  cursor:pointer;
}
.nav-toggle span{display:block;height:2px;background:var(--brand-900);border-radius:2px;transition:transform .2s ease,opacity .2s ease;}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg);}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg);}

/* ---------- 按钮 ---------- */
.btn-brand,.btn-outline-brand,.btn-accent{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:46px;padding:0 22px;
  border-radius:999px;
  font-size:15px;font-weight:600;
  border:1px solid transparent;
  cursor:pointer;
  transition:background .16s ease,color .16s ease,box-shadow .16s ease,transform .16s ease,border-color .16s ease;
}
.btn-brand{background:var(--brand-600);color:#fff;}
.btn-brand:hover{background:var(--brand-700);color:#fff;box-shadow:var(--sh-2);transform:translateY(-1px);}
.btn-brand:active{transform:none;box-shadow:var(--sh-1);}
.btn-outline-brand{background:transparent;color:var(--brand-700);border:1.5px solid var(--brand-600);}
.btn-outline-brand:hover{background:var(--brand-100);color:var(--brand-700);}
.btn-accent{background:var(--accent);color:#fff;}
.btn-accent:hover{background:var(--accent-strong);color:#fff;box-shadow:var(--sh-2);transform:translateY(-1px);}
.btn-sm{height:40px;padding:0 18px;font-size:14px;}

/* ---------- 通用小组件 ---------- */
.badge-soft{
  display:inline-flex;align-items:center;
  padding:4px 10px;
  border-radius:8px;
  font-size:12px;font-weight:600;line-height:1.5;
  background:var(--accent-soft);color:var(--accent-text);
}
.badge-blue{
  display:inline-flex;align-items:center;
  padding:4px 10px;
  border-radius:8px;
  font-size:12px;font-weight:600;line-height:1.5;
  background:var(--brand-100);color:var(--brand-700);
}
.card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--r-lg);
  box-shadow:var(--sh-1);
}

/* ---------- 页头 ---------- */
.page-intro{padding-top:28px;padding-bottom:8px;}
.breadcrumb-nav{font-size:12px;color:var(--muted);margin-bottom:16px;}
.breadcrumb-nav ol{display:flex;flex-wrap:wrap;align-items:center;gap:6px;}
.breadcrumb-nav li{display:inline-flex;align-items:center;gap:6px;}
.breadcrumb-nav li+li::before{content:"›";color:var(--line-strong);}
.breadcrumb-nav a{color:var(--muted);}
.breadcrumb-nav a:hover{color:var(--brand-700);}
.breadcrumb-nav [aria-current="page"]{color:var(--text);font-weight:600;}
.page-head{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto;
  gap:28px;
  align-items:start;
  padding:36px;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--r-lg);
  box-shadow:var(--sh-1);
}
.page-head h1{margin:14px 0 16px;max-width:22em;}
.page-lead{color:var(--muted);font-size:16px;line-height:1.85;max-width:44em;}
.meta-row{display:flex;flex-wrap:wrap;align-items:center;gap:14px;margin-top:20px;font-size:13px;color:var(--muted);}
.meta-row li{display:inline-flex;align-items:center;gap:6px;}
.meta-row li+li::before{content:"";width:4px;height:4px;border-radius:50%;background:var(--line-strong);display:inline-block;margin-right:8px;}
.back-home{
  display:inline-flex;align-items:center;gap:6px;
  font-size:14px;font-weight:600;color:var(--brand-700);
  padding:10px 4px;white-space:nowrap;
}
.back-home svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:1.75;stroke-linecap:round;stroke-linejoin:round;transition:transform .16s ease;}
.back-home:hover{color:var(--brand-600);text-decoration:underline;text-underline-offset:4px;}
.back-home:hover svg{transform:translateX(3px);}

/* ---------- 筛选条 ---------- */
.filter-bar{
  display:flex;align-items:center;gap:10px;
  overflow-x:auto;
  padding:6px 2px 14px;
  scrollbar-width:none;
}
.filter-bar::-webkit-scrollbar{display:none;}
.filter-chip{
  flex:0 0 auto;
  display:inline-flex;align-items:center;gap:8px;
  height:40px;padding:0 18px;
  border-radius:999px;
  background:var(--surface);
  border:1px solid var(--line);
  color:var(--text);
  font-size:14px;font-weight:500;
  cursor:pointer;
  transition:background .16s ease,color .16s ease,border-color .16s ease,box-shadow .16s ease;
}
.filter-chip:hover{background:var(--brand-100);border-color:var(--line-strong);color:var(--brand-700);}
.filter-chip.active{background:var(--brand-600);border-color:var(--brand-600);color:#fff;font-weight:600;box-shadow:var(--sh-1);}
.filter-count{font-size:13px;color:var(--muted);margin-left:auto;white-space:nowrap;}

/* ---------- 瀑布卡网格 ---------- */
.gallery{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:24px;
  align-items:start;
}
.g-card{
  display:flex;flex-direction:column;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--r-lg);
  box-shadow:var(--sh-1);
  overflow:hidden;
  color:inherit;
  transition:transform .16s ease,box-shadow .16s ease,border-color .16s ease;
}
.g-card:hover{transform:translateY(-2px);box-shadow:var(--sh-2);border-color:var(--line-strong);color:inherit;}
.g-thumb{aspect-ratio:4/3;overflow:hidden;background:var(--brand-100);border-bottom:1px solid var(--line);}
.g-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .4s ease;}
.g-card:hover .g-thumb img{transform:scale(1.03);}
.g-body{display:flex;flex-direction:column;gap:10px;padding:20px 22px 18px;flex:1;}
.g-body h3{
  font-size:19px;
  line-height:1.5;
  transition:color .16s ease;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.g-card:hover h3{color:var(--brand-700);}
.g-desc{
  font-size:14px;color:var(--muted);line-height:1.75;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.g-foot{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  margin-top:auto;padding:12px 22px 16px;
  border-top:1px solid var(--line);
  font-size:13px;color:var(--muted);
}
.g-more{display:inline-flex;align-items:center;gap:6px;color:var(--brand-700);font-weight:600;}
.g-more svg{width:14px;height:14px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;transition:transform .16s ease;}
.g-card:hover .g-more svg{transform:translateX(3px);}
.g-card.is-hidden{display:none;}
.empty-state{
  display:none;
  padding:48px 24px;
  text-align:center;
  background:var(--surface);
  border:1px dashed var(--line-strong);
  border-radius:var(--r-lg);
  color:var(--muted);
  font-size:15px;
}
.empty-state.show{display:block;}

/* ---------- FAQ ---------- */
.faq-wrap{max-width:820px;margin:0 auto;}
.section-head{max-width:660px;margin:0 auto 32px;text-align:center;}
.section-head h2{margin-bottom:12px;}
.section-head p{color:var(--muted);font-size:15px;line-height:1.85;}
.faq-item{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:16px;
  box-shadow:var(--sh-1);
  margin-bottom:10px;
  overflow:hidden;
  transition:box-shadow .16s ease,border-color .16s ease;
}
.faq-item.open{box-shadow:inset 3px 0 0 var(--accent),var(--sh-1);border-color:var(--line-strong);}
.faq-q{
  width:100%;
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:18px 22px;
  background:none;border:0;
  text-align:left;
  font-size:16px;font-weight:600;color:var(--text);
  cursor:pointer;
  transition:color .16s ease;
}
.faq-q:hover{color:var(--brand-700);}
.faq-item.open .faq-q{color:var(--brand-700);}
.faq-icon{
  flex:0 0 22px;width:22px;height:22px;
  display:inline-flex;align-items:center;justify-content:center;
  border-radius:50%;
  background:var(--brand-100);
  color:var(--brand-700);
  transition:transform .22s ease,background .16s ease;
}
.faq-icon svg{width:13px;height:13px;fill:none;stroke:currentColor;stroke-width:2.2;stroke-linecap:round;}
.faq-item.open .faq-icon{transform:rotate(45deg);background:var(--accent-soft);color:var(--accent-text);}
.faq-a{max-height:0;overflow:hidden;transition:max-height .26s ease;}
.faq-a p{padding:0 22px 20px;font-size:15px;line-height:1.85;color:var(--muted);}

/* ---------- 深色 CTA ---------- */
.cta-band{
  display:flex;align-items:center;justify-content:space-between;gap:32px;
  padding:44px;
  background:var(--brand-900);
  border-radius:var(--r-lg);
  box-shadow:var(--sh-2);
  color:#fff;
}
.cta-band h2{color:#fff;font-size:26px;margin-bottom:12px;}
.cta-band p{color:rgba(255,255,255,.76);font-size:15px;line-height:1.85;max-width:34em;}
.cta-actions{display:flex;flex-direction:column;align-items:flex-end;gap:12px;flex:0 0 auto;}
.cta-link{display:inline-flex;align-items:center;gap:6px;font-size:14px;color:rgba(255,255,255,.82);}
.cta-link:hover{color:#fff;text-decoration:underline;text-underline-offset:4px;}

/* ---------- 浮动 CTA ---------- */
.float-cta{position:fixed;right:24px;bottom:24px;z-index:1020;display:flex;flex-direction:column;align-items:flex-end;gap:10px;}
.float-pill{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:48px;padding:0 22px;
  border-radius:999px;
  background:var(--brand-600);color:#fff;
  font-size:15px;font-weight:600;
  box-shadow:var(--sh-3);
  opacity:0;transform:translateY(8px);pointer-events:none;
  transition:opacity .2s ease,transform .2s ease,background .16s ease;
}
.float-pill svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.75;stroke-linecap:round;stroke-linejoin:round;}
.float-pill:hover{background:var(--brand-700);color:#fff;}
.float-pill.show{opacity:1;transform:none;pointer-events:auto;}
.float-top{
  width:44px;height:44px;
  display:inline-flex;align-items:center;justify-content:center;
  border-radius:50%;
  background:var(--surface);color:var(--brand-700);
  border:1px solid var(--line);
  box-shadow:var(--sh-2);
  opacity:0;transform:translateY(8px);pointer-events:none;
  transition:opacity .2s ease,transform .2s ease,background .16s ease;
}
.float-top svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round;}
.float-top.show{opacity:1;transform:none;pointer-events:auto;}
.float-top:hover{background:var(--brand-100);color:var(--brand-700);}

/* ---------- 页脚 ---------- */
.site-footer{
  margin-top:64px;
  padding:56px 0 24px;
  background:var(--brand-900);
  color:rgba(255,255,255,.78);
}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:40px;}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:16px;}
.site-footer .brand-mark{background:rgba(255,255,255,.14);color:#fff;}
.site-footer .brand-name{color:#fff;}
.site-footer .brand-sub{color:rgba(255,255,255,.6);}
.site-footer p{font-size:14px;line-height:1.85;color:rgba(255,255,255,.7);max-width:34em;}
.footer-col h4{color:#fff;font-size:15px;margin-bottom:16px;}
.footer-links{display:flex;flex-direction:column;gap:10px;}
.footer-links a{color:rgba(255,255,255,.72);font-size:14px;}
.footer-links a:hover{color:#fff;text-decoration:underline;text-underline-offset:4px;}
.footer-bottom{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;
  margin-top:36px;padding-top:18px;
  border-top:1px solid rgba(255,255,255,.14);
  font-size:13px;color:rgba(255,255,255,.55);
}

/* ---------- 响应式 ---------- */
@media (max-width:1199px){
  .gallery{grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;}
}
@media (max-width:991px){
  h1{font-size:32px;}
  h2{font-size:24px;}
  .section{padding:56px 0;}
  .page-head{grid-template-columns:1fr;padding:28px;}
  .back-home{padding-left:0;}
  .gallery{grid-template-columns:repeat(2,minmax(0,1fr));}
  .cta-band{flex-direction:column;align-items:flex-start;padding:32px;}
  .cta-actions{align-items:flex-start;width:100%;}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
  .nav-toggle{display:flex;order:2;margin-left:auto;}
  .nav-panel{
    position:absolute;top:calc(100% + 8px);left:0;right:0;
    display:none;flex-direction:column;align-items:stretch;gap:14px;
    padding:16px;
    background:var(--surface);
    border:1px solid var(--line);
    border-radius:18px;
    box-shadow:var(--sh-3);
  }
  .nav-panel.open{display:flex;}
  .nav-chips{display:grid;grid-template-columns:1fr 1fr;gap:8px;}
  .nav-chip{justify-content:flex-start;padding:10px 12px;background:var(--bg);}
  .nav-chip.active::after{display:none;}
  .nav-actions .btn{width:100%;}
  .nav-card{flex-wrap:wrap;}
}
@media (max-width:767px){
  h1{font-size:28px;}
  h2{font-size:22px;}
  body{padding-bottom:60px;}
  .section{padding:48px 0;}
  .page-head{padding:22px;}
  .gallery{grid-template-columns:1fr;}
  .filter-bar{padding-bottom:12px;}
  .filter-count{display:none;}
  .faq-q{font-size:15px;padding:16px 18px;}
  .faq-a p{padding:0 18px 18px;}
  .cta-band{padding:26px;}
  .cta-band h2{font-size:21px;}
  .footer-grid{grid-template-columns:1fr;}
  .float-cta{right:0;left:0;bottom:0;align-items:stretch;}
  .float-pill{
    width:100%;height:56px;border-radius:0;
    padding:0 20px calc(env(safe-area-inset-bottom,0px));
    justify-content:center;
  }
  .float-top{display:none;}
}
@media (max-width:575px){
  .g-body{padding:18px 18px 14px;}
  .g-foot{padding:10px 18px 14px;}
  .meta-row{gap:10px;}
}