/* roulang page: index */
:root{
  --ink-900:#12332C;
  --ink-700:#1E4A40;
  --ink-500:#2F6A5C;
  --clay-600:#C2603C;
  --clay-700:#A34C2C;
  --sage-300:#9BB8AF;
  --paper:#F6F2EA;
  --paper-2:#EDE7DB;
  --line:#DCD3C4;
  --line-soft:#E9E3D7;
  --text:#232824;
  --text-2:#5C635D;
  --text-inv:#F6F2EA;
  --nav-w:240px;
  --radius-card:4px;
  --radius-btn:2px;
  --serif:'Noto Serif SC','Source Han Serif SC','Songti SC',serif;
  --sans:system-ui,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;

  --bs-body-bg:var(--paper);
  --bs-body-color:var(--text);
  --bs-primary:var(--clay-600);
  --bs-primary-rgb:194,96,60;
  --bs-border-color:var(--line);
  --bs-border-radius:4px;
  --bs-font-sans-serif:var(--sans);
  --bs-link-color:var(--ink-700);
  --bs-link-hover-color:var(--clay-600);
  --bs-body-font-family:var(--sans);
  --bs-body-line-height:1.85;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--paper);
  color:var(--text);
  font-family:var(--sans);
  font-size:16.5px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--ink-700);text-decoration:none;transition:color 160ms cubic-bezier(.2,.7,.3,1)}
a:hover{color:var(--clay-600)}
h1,h2,h3,h4{font-family:var(--serif);color:var(--ink-900);line-height:1.3;margin:0 0 .6em;font-weight:700}
h1{font-size:48px;letter-spacing:.01em;line-height:1.25}
h2{font-size:34px;letter-spacing:.02em}
h3{font-size:22px}
h4{font-size:18px;font-weight:600}
p{margin:0 0 1.2em;max-width:68ch}
ul,ol{margin:0;padding:0;list-style:none}
button{font-family:inherit}
:focus-visible{outline:2px solid var(--clay-600);outline-offset:2px}
.container{max-width:1200px;padding-left:24px;padding-right:24px;margin:0 auto;width:100%}

/* ===== 壳层：桌面左侧导航 ===== */
.side-nav{
  position:fixed;top:0;left:0;width:var(--nav-w);height:100vh;
  background:var(--ink-900);color:var(--text-inv);
  display:flex;flex-direction:column;padding:30px 0 24px;
  overflow-y:auto;z-index:1030;
}
.side-nav .brand{padding:0 24px 26px;border-bottom:1px solid rgba(246,242,234,.14)}
.brand-mark{
  display:block;font-family:var(--serif);font-size:19px;font-weight:700;
  color:var(--text-inv);letter-spacing:.02em;line-height:1.4;
}
.brand-mark:hover{color:var(--clay-600)}
.brand-sub{margin:8px 0 0;font-size:12.5px;color:rgba(246,242,234,.62);line-height:1.6;max-width:none}
.side-group{padding:22px 0 6px}
.side-group-title{padding:0 24px;font-size:11.5px;letter-spacing:.16em;color:rgba(246,242,234,.45);margin-bottom:8px}
.side-link{
  position:relative;display:flex;align-items:center;gap:10px;
  padding:11px 24px;font-size:15px;color:rgba(246,242,234,.72);
  transition:color 160ms cubic-bezier(.2,.7,.3,1),background 160ms cubic-bezier(.2,.7,.3,1);
}
.side-link i{width:18px;text-align:center;font-size:14px;color:rgba(155,184,175,.85)}
.side-link:hover{color:var(--text-inv);background:var(--ink-700)}
.side-link.active{color:var(--text-inv)}
.side-link.active::before{
  content:"";position:absolute;left:0;top:6px;bottom:6px;width:3px;
  background:var(--clay-600);border-radius:0 2px 2px 0;
}
.side-link.active i{color:var(--clay-600)}
.side-foot{margin-top:auto;padding:22px 24px 0;border-top:1px solid rgba(246,242,234,.14)}
.side-foot .side-cta{
  display:inline-flex;align-items:center;gap:8px;font-size:14px;color:var(--clay-600);font-weight:600;
}
.side-foot .side-cta:hover{color:var(--text-inv)}
.side-foot .side-meta{margin-top:12px;font-size:12.5px;color:rgba(246,242,234,.55);line-height:1.7}

/* ===== 移动顶栏 ===== */
.top-bar{
  position:fixed;top:0;left:0;right:0;height:56px;z-index:1040;
  background:var(--ink-900);display:flex;align-items:center;
  padding:0 12px;gap:8px;
}
.top-bar .tb-btn{
  width:44px;height:44px;display:inline-flex;align-items:center;justify-content:center;
  background:transparent;border:0;color:var(--text-inv);font-size:17px;border-radius:2px;
}
.top-bar .tb-btn:hover{background:var(--ink-700)}
.top-bar .tb-brand{
  flex:1;text-align:center;font-family:var(--serif);font-size:16px;font-weight:700;color:var(--text-inv);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.offcanvas.drawer{background:var(--ink-900);color:var(--text-inv);width:80vw;max-width:320px;border:0}
.drawer .offcanvas-header{border-bottom:1px solid rgba(246,242,234,.14);padding:18px 20px}
.drawer .offcanvas-title{font-family:var(--serif);font-size:17px;color:var(--text-inv);font-weight:700;line-height:1.45}
.drawer .btn-close{filter:invert(1) grayscale(1) brightness(2);opacity:.7}
.drawer .offcanvas-body{padding:12px 0 24px}
.modal-backdrop.show{opacity:.45;background:var(--ink-900)}

/* ===== 主内容 ===== */
.main{margin-left:var(--nav-w);min-height:100vh}
section{border-bottom:1px solid var(--line-soft)}
.sec{padding:96px 0}
.sec-alt{background:var(--paper-2)}
.sec-head{margin-bottom:48px}
.sec-head .eyebrow{
  display:inline-flex;align-items:center;gap:10px;font-size:12.5px;letter-spacing:.18em;
  color:var(--ink-500);text-transform:uppercase;margin-bottom:14px;font-family:var(--sans);font-weight:600;
}
.sec-head .eyebrow::before{content:"";width:22px;height:1px;background:var(--sage-300)}
.sec-head p{color:var(--text-2);margin-bottom:0;font-size:16px}

/* ===== Hero ===== */
.hero{padding:88px 0 72px;position:relative;overflow:hidden}
.hero::after{
  content:"";position:absolute;right:-60px;bottom:-60px;width:340px;height:340px;
  background:var(--sage-300);opacity:.06;border-radius:12px;pointer-events:none;
}
.hero-title{font-size:48px;line-height:1.25;margin-bottom:18px;max-width:15em}
.hero-sub{font-size:17px;color:var(--text-2);margin-bottom:32px;max-width:24em}
.hero-cta{display:flex;flex-wrap:wrap;gap:14px;margin-bottom:44px}
.hero-trust{display:flex;flex-wrap:wrap;gap:0}
.hero-trust li{padding:0 26px;border-left:1px solid var(--line)}
.hero-trust li:first-child{padding-left:0;border-left:0}
.hero-trust strong{
  display:block;font-family:var(--serif);font-size:32px;color:var(--ink-900);
  font-variant-numeric:tabular-nums;line-height:1.2;
}
.hero-trust span{font-size:13px;color:var(--text-2)}
.hero-figure{position:relative;margin:0}
.hero-figure img{
  width:100%;aspect-ratio:4/5;object-fit:cover;border-radius:4px;
  box-shadow:inset 0 0 0 1px rgba(18,51,44,.18);
}
.hero-figure::after{
  content:"";position:absolute;inset:0;border:1px solid rgba(18,51,44,.18);border-radius:4px;pointer-events:none;
}
.hero-ticks{position:absolute;top:18px;left:-6px;display:flex;flex-direction:column;gap:7px}
.hero-ticks i{display:block;height:1px;background:var(--sage-300)}
.hero-ticks i:nth-child(1){width:34px}
.hero-ticks i:nth-child(2){width:24px}
.hero-ticks i:nth-child(3){width:14px}

/* ===== 按钮 ===== */
.btn{transition:all 160ms cubic-bezier(.2,.7,.3,1);font-weight:600;border-radius:var(--radius-btn)}
.btn-clay{
  background:var(--clay-600);border:1px solid var(--clay-600);color:var(--text-inv);
  padding:14px 26px;font-size:15.5px;
}
.btn-clay:hover{background:var(--clay-700);border-color:var(--clay-700);color:var(--text-inv);transform:translateY(-1px);box-shadow:0 6px 16px rgba(194,96,60,.24)}
.btn-clay:active{transform:translateY(0);box-shadow:none}
.btn-ink{
  background:transparent;border:1px solid var(--ink-900);color:var(--ink-900);
  padding:14px 26px;font-size:15.5px;
}
.btn-ink:hover{background:var(--ink-900);color:var(--text-inv);transform:translateY(-1px);box-shadow:0 6px 16px rgba(18,51,44,.16)}
.btn-ink:active{transform:translateY(0);box-shadow:none}
.btn-ink-inv{
  background:transparent;border:1px solid rgba(246,242,234,.55);color:var(--text-inv);
  padding:14px 26px;font-size:15.5px;
}
.btn-ink-inv:hover{background:var(--text-inv);color:var(--ink-900);border-color:var(--text-inv)}
.link-arrow{display:inline-flex;align-items:center;gap:6px;font-size:14.5px;font-weight:600;color:var(--ink-700)}
.link-arrow i{transition:transform 160ms cubic-bezier(.2,.7,.3,1);font-size:12px}
.link-arrow:hover{color:var(--clay-600);text-decoration:underline;text-underline-offset:3px}
.link-arrow:hover i{transform:translateX(4px)}

/* ===== 徽章 / 标签 ===== */
.badge-line{
  display:inline-block;font-size:12px;padding:4px 10px;border-radius:2px;
  border:1px solid var(--clay-600);color:var(--clay-600);background:transparent;
  font-weight:600;letter-spacing:.02em;
}
.badge-solid{
  display:inline-block;font-size:12px;padding:4px 10px;border-radius:2px;
  background:var(--clay-600);color:var(--text-inv);font-weight:600;
}
.badge-soft{
  display:inline-block;font-size:12px;padding:4px 10px;border-radius:2px;
  background:var(--paper-2);color:var(--ink-700);font-weight:600;
}

/* ===== 功能分组 ===== */
.feature-layout{display:block}
.feature-side{position:sticky;top:48px}
.feature-side .side-tag{
  display:block;font-size:13.5px;padding:9px 0 9px 14px;color:var(--text-2);
  border-left:2px solid var(--line);font-weight:600;
}
.feature-side .side-tag.on{border-left-color:var(--clay-600);color:var(--ink-900)}
.feature-side .side-tag:hover{color:var(--ink-900)}
.feature-row{display:grid;grid-template-columns:64px 1fr;gap:24px;padding:36px 0;border-top:1px solid var(--line-soft)}
.feature-row:first-child{border-top:0;padding-top:0}
.feature-num{font-family:var(--serif);font-size:40px;line-height:1;color:var(--sage-300);font-variant-numeric:tabular-nums}
.feature-row h3{margin-bottom:12px}
.feature-row p{color:var(--text-2);font-size:15.5px;margin-bottom:18px}
.feature-points li{position:relative;padding-left:18px;font-size:15px;color:var(--text);margin-bottom:8px}
.feature-points li::before{content:"";position:absolute;left:0;top:11px;width:6px;height:6px;background:var(--ink-500)}
.feature-img{margin:20px 0 0;border-radius:4px;overflow:hidden;border:1px solid var(--line)}
.feature-img img{width:100%;aspect-ratio:4/3;object-fit:cover}
.feature-wire{
  margin-top:20px;border:1px dashed var(--line);border-radius:4px;height:120px;
  display:flex;align-items:center;justify-content:center;color:var(--text-2);font-size:13px;background:var(--paper);
}

/* ===== 使用场景 ===== */
.steps{position:relative;padding-left:34px}
.steps::before{content:"";position:absolute;left:6px;top:8px;bottom:8px;width:1px;background:var(--line)}
.step{position:relative;padding-bottom:52px}
.step:last-child{padding-bottom:0}
.step::before{
  content:"";position:absolute;left:-34px;top:9px;width:8px;height:8px;background:var(--ink-900);
  outline:4px solid var(--paper);
}
.sec-alt .step::before{outline-color:var(--paper-2)}
.step-num{font-family:var(--serif);font-size:14px;letter-spacing:.14em;color:var(--clay-600);font-weight:700;margin-bottom:8px;display:block;font-variant-numeric:tabular-nums}
.step p{color:var(--text-2);font-size:15.5px;margin-bottom:0}
.step-img{margin-top:20px;border-radius:4px;overflow:hidden;border:1px solid var(--line)}
.step-img img{width:100%;aspect-ratio:16/10;object-fit:cover}

/* ===== 案例 ===== */
.case-main{
  border:1px solid var(--line);border-radius:4px;background:var(--paper);
  padding:24px;height:100%;transition:all 160ms cubic-bezier(.2,.7,.3,1);
}
.case-main:hover{border-color:var(--ink-500);transform:translateY(-2px);box-shadow:0 10px 28px rgba(18,51,44,.08)}
.case-main img{width:100%;aspect-ratio:16/10;object-fit:cover;border-radius:4px;margin:16px 0}
.case-quote{font-family:var(--serif);font-size:18px;color:var(--ink-900);line-height:1.7;margin-bottom:20px}
.case-stats{display:flex;flex-wrap:wrap;border-top:1px solid var(--line-soft);padding-top:18px}
.case-stats div{flex:1;min-width:110px;padding-right:16px}
.case-stats strong{display:block;font-family:var(--serif);font-size:26px;color:var(--clay-600);font-variant-numeric:tabular-nums;line-height:1.3}
.case-stats span{font-size:12.5px;color:var(--text-2)}
.case-mini{
  border:1px solid var(--line);border-radius:4px;background:var(--paper);
  padding:24px;transition:all 160ms cubic-bezier(.2,.7,.3,1);
}
.case-mini:hover{border-color:var(--ink-500);transform:translateY(-2px);box-shadow:0 10px 28px rgba(18,51,44,.08)}
.case-mini h3{font-size:19px;margin:12px 0 10px}
.case-mini p{font-size:15px;color:var(--text-2);margin-bottom:12px}
.case-mini .mini-result{font-size:13.5px;color:var(--ink-700);font-weight:600;font-variant-numeric:tabular-nums}

/* ===== 价格 ===== */
.price-card{
  border:1px solid var(--line);border-radius:4px;background:var(--paper);
  padding:28px 26px;height:100%;display:flex;flex-direction:column;position:relative;
  transition:all 160ms cubic-bezier(.2,.7,.3,1);
}
.price-card:hover{border-color:var(--ink-500);transform:translateY(-2px);box-shadow:0 10px 28px rgba(18,51,44,.08)}
.price-card .p-name{font-family:var(--serif);font-size:20px;color:var(--ink-900);font-weight:700;margin-bottom:6px}
.price-card .p-for{font-size:13.5px;color:var(--text-2);margin-bottom:20px}
.price-card .p-num{font-family:var(--serif);font-size:40px;color:var(--ink-900);line-height:1.15;font-variant-numeric:tabular-nums}
.price-card .p-num small{font-size:14px;font-family:var(--sans);color:var(--text-2);margin-left:6px;font-weight:400}
.price-card .p-list{margin:22px 0 26px;flex:1}
.price-card .p-list li{
  position:relative;padding-left:22px;font-size:14.5px;color:var(--text-2);margin-bottom:10px;
}
.price-card .p-list li::before{
  content:"";position:absolute;left:0;top:9px;width:11px;height:6px;
  border-left:1px solid var(--ink-500);border-bottom:1px solid var(--ink-500);transform:rotate(-45deg);
}
.price-featured{background:var(--ink-900);border-color:var(--ink-900);color:var(--text-inv)}
.price-featured .p-name,.price-featured .p-num{color:var(--text-inv)}
.price-featured .p-for,.price-featured .p-list li{color:rgba(246,242,234,.72)}
.price-featured .p-list li::before{border-color:var(--sage-300)}
.price-featured:hover{border-color:var(--ink-700)}
.price-tag{position:absolute;top:22px;right:22px}
.price-note{margin-top:26px;font-size:14px;color:var(--text-2);text-align:center}

/* ===== 资讯 / 最新信息 ===== */
.news-main{
  border:1px solid var(--line);border-radius:4px;background:var(--paper);
  overflow:hidden;display:flex;flex-direction:column;height:100%;
  transition:all 160ms cubic-bezier(.2,.7,.3,1);
}
.news-main:hover{border-color:var(--ink-500);transform:translateY(-2px);box-shadow:0 10px 28px rgba(18,51,44,.08)}
.news-main .nm-body{padding:24px}
.news-main .nm-body h3{font-size:21px;margin:12px 0 12px}
.news-main .nm-body h3 a{color:inherit}
.news-main .nm-body h3 a:hover{color:var(--clay-600)}
.news-main .nm-sum{
  font-size:15px;color:var(--text-2);margin-bottom:18px;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.news-main img{width:100%;aspect-ratio:16/10;object-fit:cover}
.news-item{
  display:block;padding:18px 0;border-top:1px solid var(--line-soft);
  transition:all 160ms cubic-bezier(.2,.7,.3,1);
}
.news-item:first-child{border-top:0;padding-top:0}
.news-item h3{
  font-size:16.5px;line-height:1.6;margin:10px 0 8px;font-family:var(--sans);font-weight:600;color:var(--ink-900);
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.news-item:hover h3{color:var(--clay-600)}
.news-item .ni-sum{
  font-size:14px;color:var(--text-2);margin-bottom:10px;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
.news-meta{display:flex;align-items:center;justify-content:space-between;font-size:13px;color:var(--text-2)}
.news-meta time{font-variant-numeric:tabular-nums}
.news-meta .arw{color:var(--ink-500);transition:transform 160ms cubic-bezier(.2,.7,.3,1)}
.news-item:hover .arw{transform:translateX(4px);color:var(--clay-600)}
.empty-box{
  border:1px dashed var(--line);border-radius:4px;min-height:160px;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;
  color:var(--text-2);text-align:center;padding:28px;
}
.empty-box i{font-size:24px;color:var(--sage-300)}
.empty-box p{font-size:14px;margin:0}

/* ===== FAQ ===== */
.faq{border-top:1px solid var(--line-soft)}
.faq-item{border-bottom:1px solid var(--line-soft)}
.faq-q{
  width:100%;background:transparent;border:0;text-align:left;
  padding:22px 44px 22px 0;position:relative;font-size:17px;font-weight:600;color:var(--ink-900);
  transition:color 160ms cubic-bezier(.2,.7,.3,1);cursor:pointer;line-height:1.6;
}
.faq-q:hover{color:var(--ink-500)}
.faq-q .ic{
  position:absolute;right:6px;top:50%;transform:translateY(-50%);
  font-size:16px;color:var(--clay-600);transition:transform 200ms cubic-bezier(.2,.7,.3,1);
}
.faq-item.open .faq-q .ic{transform:translateY(-50%) rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height 260ms cubic-bezier(.2,.7,.3,1)}
.faq-a .inner{padding:0 44px 20px 0;font-size:15.5px;line-height:1.85;color:var(--text-2)}

/* ===== CTA + 表单 ===== */
.cta-block{background:var(--ink-900);color:var(--text-inv);padding:96px 0}
.cta-block h2{color:var(--text-inv);font-size:32px;margin-bottom:16px}
.cta-block p{color:rgba(246,242,234,.72);font-size:15.5px}
.cta-list li{position:relative;padding-left:20px;font-size:14.5px;color:rgba(246,242,234,.78);margin-bottom:10px}
.cta-list li::before{content:"";position:absolute;left:0;top:10px;width:6px;height:6px;background:var(--clay-600)}
.form-label{font-size:13px;color:var(--text-2);display:block;margin-bottom:8px}
.cta-block .form-label{color:rgba(246,242,234,.66)}
.field{
  width:100%;background:transparent;border:0;border-bottom:1px solid rgba(246,242,234,.35);
  padding:10px 0;color:var(--text-inv);font-size:15.5px;border-radius:0;
  transition:border-color 160ms cubic-bezier(.2,.7,.3,1);
}
.field::placeholder{color:rgba(246,242,234,.35)}
.field:focus{outline:none;border-bottom:2px solid var(--clay-600)}
.field.err{border-bottom-color:var(--clay-600)}
.err-msg{font-size:13px;color:var(--clay-600);margin-top:6px;display:none}
.err-msg.show{display:block}
.check-row{display:flex;align-items:flex-start;gap:10px;font-size:13.5px;color:rgba(246,242,234,.72)}
.check-row input{margin-top:4px;width:16px;height:16px;accent-color:var(--clay-600)}
.form-success{
  border:1px dashed rgba(246,242,234,.45);border-radius:4px;padding:22px;font-size:15px;
  color:var(--text-inv);display:none;
}
.form-success.show{display:block}

/* ===== 页脚 ===== */
.site-foot{background:var(--ink-900);color:var(--text-inv);padding:72px 0 0}
.site-foot h4{color:var(--text-inv);font-size:14px;letter-spacing:.08em;margin-bottom:18px;font-family:var(--sans);font-weight:600}
.site-foot .f-brand{font-family:var(--serif);font-size:19px;font-weight:700;color:var(--text-inv);margin-bottom:12px}
.site-foot .f-desc{font-size:14px;color:rgba(246,242,234,.62);max-width:30ch;line-height:1.8}
.f-links li{margin-bottom:10px}
.f-links a{font-size:14px;color:rgba(246,242,234,.72)}
.f-links a:hover{color:var(--clay-600)}
.f-contact li{font-size:14px;color:rgba(246,242,234,.72);margin-bottom:10px}
.foot-bar{
  margin-top:56px;border-top:1px solid rgba(246,242,234,.14);
  padding:22px 0;font-size:13px;color:rgba(246,242,234,.5);
  display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;
}
.to-top{
  position:fixed;right:24px;bottom:24px;width:40px;height:40px;z-index:1020;
  border:1px solid var(--line);background:var(--paper);color:var(--ink-900);
  display:flex;align-items:center;justify-content:center;border-radius:2px;
  transition:all 160ms cubic-bezier(.2,.7,.3,1);cursor:pointer;
}
.to-top:hover{background:var(--ink-900);color:var(--text-inv);border-color:var(--ink-900)}

/* ===== 动效 ===== */
.reveal{opacity:0;transform:translateY(12px);transition:opacity 320ms cubic-bezier(.2,.7,.3,1),transform 320ms cubic-bezier(.2,.7,.3,1)}
.reveal.in{opacity:1;transform:translateY(0)}
@media (prefers-reduced-motion:reduce){
  *{transition-duration:0ms !important;animation-duration:0ms !important}
  .reveal{opacity:1;transform:none}
}

/* ===== 响应式 ===== */
@media (max-width:1399.98px){
  .container{max-width:1140px}
}
@media (min-width:992px) and (max-width:1199.98px){
  :root{--nav-w:152px}
  .side-nav .brand{padding:0 16px 20px}
  .brand-mark{font-size:15px}
  .brand-sub{font-size:11.5px}
  .side-link{padding:10px 16px;font-size:14px;gap:8px}
  .side-group-title{padding:0 16px;font-size:11px}
  .side-foot{padding:18px 16px 0}
  .side-foot .side-cta{font-size:13px;gap:6px}
  h1,.hero-title{font-size:40px}
  h2{font-size:30px}
  .sec{padding:72px 0}
}
@media (max-width:991.98px){
  body{font-size:16px}
  .main{margin-left:0;padding-top:56px}
  h1,.hero-title{font-size:34px}
  h2{font-size:26px}
  h3{font-size:19px}
  h4{font-size:17px}
  .sec{padding:52px 0}
  .hero{padding:48px 0 44px}
  .hero::after{display:none}
  .hero-title{max-width:none;margin-bottom:14px}
  .hero-sub{font-size:16px;margin-bottom:26px}
  .hero-cta{margin-bottom:34px}
  .hero-cta .btn{width:100%;text-align:center}
  .hero-trust li{padding:0 16px}
  .hero-trust strong{font-size:26px}
  .hero-figure{margin-top:8px}
  .hero-figure img{aspect-ratio:1/1}
  .sec-head{margin-bottom:32px}
  .feature-side{position:static;margin-bottom:26px;display:flex;gap:20px;overflow-x:auto;scrollbar-width:none;border-bottom:1px solid var(--line)}
  .feature-side::-webkit-scrollbar{display:none}
  .feature-side .side-tag{border-left:0;border-bottom:2px solid transparent;padding:0 0 10px;white-space:nowrap}
  .feature-side .side-tag.on{border-bottom-color:var(--clay-600)}
  .feature-row{grid-template-columns:1fr;gap:10px;padding:28px 0}
  .feature-num{font-size:32px}
  .steps{padding-left:26px}
  .step::before{left:-26px}
  .step{padding-bottom:38px}
  .cta-block{padding:52px 0}
  .cta-block h2{font-size:26px}
  .site-foot{padding:52px 0 0}
  .to-top{width:36px;height:36px;right:16px;bottom:16px}
  .news-main{margin-bottom:20px}
}
@media (max-width:575.98px){
  .container{padding-left:20px;padding-right:20px}
  h1,.hero-title{font-size:30px}
  h2{font-size:23px}
  .hero-trust{flex-direction:column;gap:14px}
  .hero-trust li{padding:0;border-left:0;display:flex;align-items:baseline;gap:10px}
  .hero-trust strong{font-size:24px}
  .case-stats{flex-direction:column;gap:12px}
  .case-stats div{padding-right:0}
  .price-card{padding:24px 20px}
}

/* roulang page: article */
:root{
  --ink-900:#12332C;
  --ink-700:#1E4A40;
  --ink-500:#2F6A5C;
  --clay-600:#C2603C;
  --clay-700:#A34C2C;
  --sage-300:#9BB8AF;
  --paper:#F6F2EA;
  --paper-2:#EDE7DB;
  --line:#DCD3C4;
  --line-soft:#E9E3D7;
  --text:#232824;
  --text-2:#5C635D;
  --text-inv:#F6F2EA;
  --font-serif:'Noto Serif SC','Source Han Serif SC','Songti SC',serif;
  --font-sans:system-ui,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  --radius-card:4px;
  --radius-btn:2px;
  --ease:cubic-bezier(.2,.7,.3,1);

  --bs-body-bg:var(--paper);
  --bs-body-color:var(--text);
  --bs-primary:var(--clay-600);
  --bs-border-color:var(--line);
  --bs-border-radius:4px;
  --bs-font-sans-serif:var(--font-sans);
  --bs-link-color:var(--ink-500);
  --bs-link-hover-color:var(--clay-600);
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--paper);
  color:var(--text);
  font-family:var(--font-sans);
  font-size:16.5px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--ink-500);text-decoration:none;transition:color 160ms var(--ease)}
a:hover{color:var(--clay-600)}
h1,h2,h3,h4{font-family:var(--font-serif);color:var(--ink-900);font-weight:650;line-height:1.3;margin:0}
p{margin:0 0 1.2em}
p:last-child{margin-bottom:0}
button{font-family:inherit}
:focus-visible{outline:2px solid var(--clay-600);outline-offset:2px}
.container{max-width:1200px;padding-left:24px;padding-right:24px;margin:0 auto}
.num{font-variant-numeric:tabular-nums}

/* ---------- 侧栏导航 ---------- */
.side-nav{
  position:fixed;top:0;left:0;bottom:0;width:240px;
  background:var(--ink-900);color:var(--text-inv);
  display:flex;flex-direction:column;
  padding:26px 0 20px;z-index:1040;overflow-y:auto;
}
.side-brand{
  font-family:var(--font-serif);font-size:19px;font-weight:700;color:var(--text-inv);
  padding:0 24px 16px;letter-spacing:.01em;
}
.side-brand span{
  display:block;font-family:var(--font-sans);font-size:11.5px;
  letter-spacing:.18em;color:rgba(246,242,234,.58);font-weight:400;margin-top:6px;
}
.side-nav nav{display:flex;flex-direction:column;padding:18px 0;border-top:1px solid rgba(246,242,234,.12)}
.side-link{
  position:relative;display:flex;align-items:center;gap:12px;
  padding:11px 24px;font-size:14.5px;color:rgba(246,242,234,.72);
  transition:color 160ms var(--ease),background 160ms var(--ease);
}
.side-link i{width:18px;font-size:14px;text-align:center;color:var(--sage-300);transition:color 160ms var(--ease)}
.side-link:hover{color:#fff;background:rgba(246,242,234,.06)}
.side-link:hover i{color:var(--clay-600)}
.side-link.active{color:#fff;background:rgba(246,242,234,.07)}
.side-link.active::before{
  content:"";position:absolute;left:0;top:8px;bottom:8px;width:3px;
  background:var(--clay-600);border-radius:0 2px 2px 0;
}
.side-group-title{
  font-size:11.5px;letter-spacing:.16em;color:rgba(246,242,234,.45);
  padding:16px 24px 8px;margin:0;font-family:var(--font-sans);font-weight:500;
}
.side-foot{margin-top:auto;padding:20px 24px 0;border-top:1px solid rgba(246,242,234,.12)}
.side-cta{
  display:inline-flex;align-items:center;gap:8px;font-size:14px;font-weight:600;
  color:var(--text-inv);padding:9px 0;
}
.side-cta i{transition:transform 160ms var(--ease)}
.side-cta:hover{color:var(--clay-600)}
.side-cta:hover i{transform:translateX(4px)}
.side-note{font-size:12.5px;color:rgba(246,242,234,.55);margin:8px 0 0;line-height:1.7}

/* ---------- 主内容区 ---------- */
.main-area{margin-left:240px;min-height:100vh;background:var(--paper)}
.top-bar{display:none}
.drawer{background:var(--ink-900);color:var(--text-inv);width:80vw;max-width:320px}
.drawer .offcanvas-header{
  border-bottom:1px solid rgba(246,242,234,.12);padding:16px 20px;
}
.drawer-brand{font-family:var(--font-serif);font-size:17px;font-weight:700;color:var(--text-inv)}
.drawer-close{
  background:transparent;border:1px solid rgba(246,242,234,.28);color:var(--text-inv);
  width:36px;height:36px;border-radius:2px;display:flex;align-items:center;justify-content:center;
}
.drawer-close:hover{background:rgba(246,242,234,.12)}
.drawer .offcanvas-body{padding:12px 0 24px;display:flex;flex-direction:column}
.drawer-nav{display:flex;flex-direction:column}
.drawer-nav .side-link{padding:13px 20px;font-size:15px}
.drawer-foot{margin-top:auto;padding:20px;border-top:1px solid rgba(246,242,234,.12);font-size:13px;color:rgba(246,242,234,.62);line-height:1.8}
.offcanvas-backdrop{background-color:var(--ink-900)}
.offcanvas-backdrop.show{opacity:.45}

/* ---------- 面包屑 ---------- */
.crumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-size:14px;color:var(--text-2);padding:28px 0 0;
}
.crumb a{color:var(--text-2)}
.crumb a:hover{color:var(--clay-600)}
.crumb .sep{color:var(--line)}
.crumb-cur{color:var(--ink-900)}

/* ---------- 文章头 ---------- */
.art-hero{padding-bottom:36px;border-bottom:1px solid var(--line-soft)}
.art-head{padding-top:22px}
.badge-cat{
  display:inline-block;font-size:12px;padding:4px 10px;border-radius:2px;
  border:1px solid var(--clay-600);color:var(--clay-600);background:transparent;letter-spacing:.02em;
}
.art-head h1{
  font-size:32px;line-height:1.35;letter-spacing:.01em;
  margin:16px 0 18px;max-width:860px;
}
.art-meta{display:flex;flex-wrap:wrap;align-items:center;gap:18px;font-size:13px;color:var(--text-2)}
.art-meta time{font-variant-numeric:tabular-nums}
.art-meta .dot{width:4px;height:4px;background:var(--sage-300);display:inline-block;border-radius:1px}

/* ---------- 正文 ---------- */
.art-wrap{padding:52px 0 72px}
.article-body{max-width:760px;font-size:17px;line-height:1.9;color:var(--text);overflow-wrap:anywhere}
.article-body h2{font-size:24px;line-height:1.5;margin:40px 0 16px;letter-spacing:.02em}
.article-body h3{font-size:20px;line-height:1.5;margin:32px 0 12px}
.article-body h4{font-size:18px;margin:24px 0 10px}
.article-body h2:first-child,.article-body h3:first-child{margin-top:0}
.article-body p{margin:0 0 1.2em}
.article-body ul,.article-body ol{padding-left:22px;margin:0 0 1.2em}
.article-body li{margin-bottom:8px}
.article-body li::marker{color:var(--clay-600)}
.article-body blockquote{
  border-left:3px solid var(--clay-600);background:var(--paper-2);
  padding:16px 20px;margin:24px 0;color:var(--text-2);
}
.article-body img{border-radius:4px;margin:24px auto;max-width:100%;height:auto}
.article-body figure{margin:24px 0}
.article-body figcaption{font-size:13px;color:var(--text-2);text-align:center;margin-top:10px}
.article-body table{
  width:100%;border-collapse:collapse;font-size:15px;margin:24px 0;display:block;overflow-x:auto;
}
.article-body th,.article-body td{border:1px solid var(--line);padding:10px 12px;text-align:left}
.article-body th{background:var(--paper-2);color:var(--ink-900)}
.article-body a{text-decoration:underline;text-underline-offset:3px}
.article-body a:hover{color:var(--clay-600)}
.article-body pre{background:var(--paper-2);border:1px solid var(--line);border-radius:4px;padding:16px;overflow-x:auto;font-size:14px}
.article-body hr{border:0;border-top:1px solid var(--line-soft);margin:32px 0}
.empty-box{
  border:1px dashed var(--line);border-radius:4px;background:var(--paper-2);
  padding:40px 24px;text-align:center;
}
.empty-box i{font-size:24px;color:var(--sage-300);display:block;margin-bottom:12px}
.empty-box p{font-size:15px;color:var(--text-2);margin-bottom:16px}
.art-actions{margin-top:44px;padding-top:28px;border-top:1px solid var(--line-soft);max-width:760px}

/* ---------- 相关推荐 ---------- */
.rel-band{padding:0 0 72px}
.rel-head{display:flex;align-items:baseline;justify-content:space-between;gap:20px;margin-bottom:8px}
.rel-head h2{font-size:22px}
.rel-list{list-style:none;padding:0;margin:0;max-width:860px}
.rel-list li{border-top:1px solid var(--line-soft)}
.rel-list li:last-child{border-bottom:1px solid var(--line-soft)}
.rel-list a{
  display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding:18px 0;color:var(--text);font-size:16px;
}
.rel-list a:hover{color:var(--clay-600)}
.rel-list a:hover .rel-title i{transform:translateX(4px)}
.rel-title{display:inline-flex;align-items:center;gap:10px;font-weight:600}
.rel-title i{font-size:12px;color:var(--clay-600);transition:transform 160ms var(--ease)}
.rel-date{font-size:13px;color:var(--text-2);font-variant-numeric:tabular-nums;white-space:nowrap}

/* ---------- CTA ---------- */
.cta-band{background:var(--ink-900);color:var(--text-inv);padding:64px 0}
.cta-band .cta-inner{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:28px}
.cta-band h2{color:var(--text-inv);font-size:28px;margin-bottom:10px}
.cta-band p{color:rgba(246,242,234,.72);margin:0;max-width:52ch;font-size:15.5px}
.btn-main{
  display:inline-flex;align-items:center;gap:8px;
  background:var(--clay-600);border:1px solid var(--clay-600);color:#fff;
  border-radius:var(--radius-btn);padding:14px 26px;font-size:15px;font-weight:600;
  transition:background 160ms var(--ease),transform 160ms var(--ease),box-shadow 160ms var(--ease);
}
.btn-main:hover{
  background:var(--clay-700);border-color:var(--clay-700);color:#fff;
  transform:translateY(-1px);box-shadow:0 6px 16px rgba(194,96,60,.24);
}
.btn-main:active{transform:translateY(0);box-shadow:none}
.btn-ghost{
  display:inline-flex;align-items:center;gap:8px;
  background:transparent;border:1px solid var(--ink-900);color:var(--ink-900);
  border-radius:var(--radius-btn);padding:13px 24px;font-size:15px;font-weight:600;
  transition:background 160ms var(--ease),color 160ms var(--ease),transform 160ms var(--ease);
}
.btn-ghost:hover{background:var(--ink-900);color:var(--text-inv);transform:translateY(-1px)}
.btn-inv{
  display:inline-flex;align-items:center;gap:8px;
  background:transparent;border:1px solid rgba(246,242,234,.4);color:var(--text-inv);
  border-radius:var(--radius-btn);padding:13px 24px;font-size:15px;font-weight:600;
  transition:background 160ms var(--ease),color 160ms var(--ease);
}
.btn-inv:hover{background:var(--text-inv);color:var(--ink-900);border-color:var(--text-inv)}

/* ---------- 页脚 ---------- */
.site-foot{background:var(--ink-900);color:var(--text-inv);padding:64px 0 0}
.f-brand{font-family:var(--font-serif);font-size:19px;font-weight:700;color:var(--text-inv);margin-bottom:14px}
.f-desc{font-size:14px;color:rgba(246,242,234,.66);line-height:1.8;max-width:34ch;margin:0}
.site-foot h4{font-family:var(--font-sans);font-size:14px;color:var(--text-inv);margin-bottom:16px;letter-spacing:.04em}
.f-links,.f-contact{list-style:none;padding:0;margin:0}
.f-links li,.f-contact li{margin-bottom:10px;font-size:14px}
.f-links a{color:rgba(246,242,234,.72)}
.f-links a:hover{color:var(--clay-600)}
.f-contact li{color:rgba(246,242,234,.66)}
.foot-bar{
  margin-top:48px;border-top:1px solid rgba(246,242,234,.14);padding:22px 0 28px;
  display:flex;flex-wrap:wrap;gap:14px 28px;font-size:13px;color:rgba(246,242,234,.6);
}
.to-top{
  position:fixed;right:24px;bottom:24px;width:40px;height:40px;z-index:1035;
  background:var(--paper);border:1px solid var(--line);border-radius:2px;color:var(--ink-900);
  display:flex;align-items:center;justify-content:center;cursor:pointer;
  transition:background 160ms var(--ease),color 160ms var(--ease),border-color 160ms var(--ease);
}
.to-top:hover{background:var(--ink-900);color:var(--text-inv);border-color:var(--ink-900)}

/* ---------- 动效 ---------- */
.reveal{opacity:0;transform:translateY(12px)}
.reveal.in{opacity:1;transform:none;transition:opacity 320ms var(--ease),transform 320ms var(--ease)}

/* ---------- 响应式 ---------- */
@media (min-width:992px) and (max-width:1199.98px){
  .side-nav{width:80px;padding-top:22px}
  .side-brand{padding:0 0 14px;text-align:center;font-size:0}
  .side-brand::before{content:"入";font-size:18px;color:var(--text-inv)}
  .side-brand span{display:none}
  .side-link{justify-content:center;padding:13px 0}
  .side-link span{display:none}
  .side-group-title{display:none}
  .side-foot{padding:16px 8px 0;text-align:center}
  .side-cta span,.side-note{display:none}
  .main-area{margin-left:80px}
  .side-link{position:relative}
  .side-link:hover::after{
    content:attr(title);position:absolute;left:74px;top:50%;transform:translateY(-50%);
    background:var(--ink-700);color:var(--text-inv);font-size:12.5px;padding:6px 10px;
    border-radius:2px;white-space:nowrap;z-index:5;
  }
}
@media (max-width:991.98px){
  .side-nav{display:none}
  .main-area{margin-left:0}
  .top-bar{
    display:flex;align-items:center;gap:12px;position:sticky;top:0;z-index:1030;
    height:56px;padding:0 16px;background:var(--paper);border-bottom:1px solid var(--line);
  }
  .tb-btn,.tb-cta{
    width:44px;height:44px;display:flex;align-items:center;justify-content:center;
    background:transparent;border:1px solid var(--line);border-radius:2px;color:var(--ink-900);
  }
  .tb-btn:hover,.tb-cta:hover{background:var(--paper-2)}
  .tb-brand{
    flex:1;text-align:center;font-family:var(--font-serif);font-size:16px;
    font-weight:700;color:var(--ink-900);
  }
}
@media (max-width:767.98px){
  body{font-size:16px}
  .container{padding-left:20px;padding-right:20px}
  .art-head h1{font-size:26px}
  .art-wrap{padding:40px 0 56px}
  .article-body{font-size:16.5px}
  .article-body h2{font-size:22px;margin-top:34px}
  .article-body h3{font-size:19px}
  .rel-list a{flex-direction:column;align-items:flex-start;gap:6px}
  .cta-band{padding:52px 0}
  .cta-band h2{font-size:23px}
  .cta-band .cta-inner{flex-direction:column;align-items:flex-start}
  .site-foot{padding-top:52px}
  .foot-bar{margin-top:36px;flex-direction:column;gap:10px}
  .to-top{width:36px;height:36px;right:16px;bottom:16px}
}
@media (prefers-reduced-motion:reduce){
  *{transition-duration:0ms !important;animation-duration:0ms !important}
  .reveal{opacity:1;transform:none}
  html{scroll-behavior:auto}
}

/* roulang page: category1 */
:root{
  --ink-900:#12332C;--ink-700:#1E4A40;--ink-500:#2F6A5C;
  --clay-600:#C2603C;--clay-700:#A34C2C;--sage-300:#9BB8AF;
  --paper:#F6F2EA;--paper-2:#EDE7DB;
  --line:#DCD3C4;--line-soft:#E9E3D7;
  --text:#232824;--text-2:#5C635D;--text-inv:#F6F2EA;
  --nav-w:240px;
  --serif:'Noto Serif SC','Source Han Serif SC','Songti SC',serif;
  --sans:system-ui,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  --ease:cubic-bezier(.2,.7,.3,1);

  --bs-body-bg:#F6F2EA;
  --bs-body-color:#232824;
  --bs-border-color:#DCD3C4;
  --bs-border-radius:4px;
  --bs-border-radius-sm:2px;
  --bs-font-sans-serif:var(--sans);
  --bs-link-color:#2F6A5C;
  --bs-link-hover-color:#C2603C;
  --bs-primary:#C2603C;
  --bs-primary-rgb:194,96,60;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--paper);color:var(--text);
  font-family:var(--sans);font-size:16.5px;line-height:1.85;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
img{max-width:100%;display:block}
a{color:var(--ink-500);text-decoration:none;transition:color 160ms var(--ease)}
a:hover{color:var(--clay-600)}
h1,h2,h3,h4{font-family:var(--serif);color:var(--ink-900);line-height:1.3;margin:0}
p{margin:0 0 1.2em;max-width:68ch}
ul{margin:0;padding:0;list-style:none}
:focus-visible{outline:2px solid var(--clay-600);outline-offset:2px;border-radius:2px}
.container{max-width:1200px;padding-left:24px;padding-right:24px}
.fade-up{opacity:1;transform:none}
.js .fade-up{opacity:0;transform:translateY(12px);transition:opacity 320ms var(--ease),transform 320ms var(--ease)}
.js .fade-up.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .js .fade-up{opacity:1;transform:none;transition:none}
  *{transition-duration:0ms !important;animation-duration:0ms !important}
}

/* ============ 左侧竖向导航 ============ */
.site-nav{
  position:fixed;top:0;left:0;bottom:0;width:var(--nav-w);
  background:var(--ink-900);color:var(--text-inv);
  display:flex;flex-direction:column;z-index:1040;overflow-y:auto;
}
.nav-brand{padding:30px 22px 22px;border-bottom:1px solid rgba(246,242,234,.14)}
.brand-mark{
  font-family:var(--serif);font-size:19px;font-weight:700;line-height:1.35;
  color:#fff;letter-spacing:.01em;display:block;
}
.brand-mark:hover{color:#fff}
.brand-sub{margin:10px 0 0;font-size:12px;line-height:1.6;color:rgba(246,242,234,.55);letter-spacing:.04em}
.site-nav nav{padding:18px 0 8px;flex:1}
.side-link{
  display:flex;align-items:center;gap:12px;min-height:44px;
  padding:10px 20px 10px 19px;font-size:14.5px;color:rgba(246,242,234,.72);
  border-left:3px solid transparent;transition:all 160ms var(--ease);
}
.side-link i{width:18px;font-size:14px;text-align:center;flex:0 0 18px}
.side-link:hover{color:#fff;background:rgba(246,242,234,.07)}
.side-link.active{color:#fff;border-left-color:var(--clay-600);background:rgba(246,242,234,.06)}
.side-group{padding:14px 0 6px;margin-top:12px;border-top:1px solid rgba(246,242,234,.12)}
.side-group-title{
  font-size:11.5px;letter-spacing:.14em;color:rgba(246,242,234,.42);
  padding:0 22px;margin:0 0 8px;font-family:var(--sans);
}
.nav-foot{padding:18px 22px 26px;border-top:1px solid rgba(246,242,234,.14)}
.nav-cta{
  display:inline-flex;align-items:center;justify-content:center;
  background:var(--clay-600);color:#fff;font-size:14px;font-weight:600;
  padding:11px 18px;border-radius:2px;width:100%;
}
.nav-cta:hover{background:var(--clay-700);color:#fff;transform:translateY(-1px)}
.nav-contact{margin:14px 0 0;font-size:12.5px;line-height:1.7;color:rgba(246,242,234,.5)}

/* ============ 移动顶栏 ============ */
.mobile-bar{
  display:none;position:sticky;top:0;z-index:1035;height:56px;
  background:var(--ink-900);align-items:center;justify-content:space-between;
  padding:0 12px;gap:8px;
}
.menu-btn,.mobile-cta{
  width:44px;height:44px;display:inline-flex;align-items:center;justify-content:center;
  background:transparent;border:0;color:var(--text-inv);font-size:17px;border-radius:2px;
}
.menu-btn:hover,.mobile-cta:hover{background:rgba(246,242,234,.1);color:#fff}
.mobile-brand{font-family:var(--serif);font-size:16px;color:#fff;font-weight:700}
.mobile-brand:hover{color:#fff}

.offcanvas.nav-drawer{background:var(--ink-900);color:var(--text-inv);width:80vw;max-width:320px}
.nav-drawer .offcanvas-header{border-bottom:1px solid rgba(246,242,234,.14);padding:18px 20px}
.nav-drawer .drawer-title{font-family:var(--serif);font-size:17px;color:#fff;margin:0}
.nav-drawer .btn-close{filter:invert(1) grayscale(1) brightness(1.6);opacity:.7}
.nav-drawer .offcanvas-body{padding:12px 0 26px}
.offcanvas-backdrop.show{opacity:.45}

/* ============ 主区域 ============ */
.site-main{margin-left:var(--nav-w);min-height:100vh;display:flex;flex-direction:column}

/* ============ 分类首屏 ============ */
.cat-hero{background:var(--paper-2);border-bottom:1px solid var(--line);padding:56px 0 0}
.crumb{font-size:14px;color:var(--text-2);margin:0 0 18px}
.crumb a{color:var(--text-2)}
.crumb a:hover{color:var(--clay-600)}
.crumb span{margin:0 6px;color:var(--line)}
.cat-hero h1{font-size:44px;font-weight:700;letter-spacing:.01em;max-width:20ch}
.cat-lead{margin:18px 0 0;font-size:16px;color:var(--text-2);max-width:44ch}
.cat-tabs{display:flex;gap:30px;margin-top:30px;overflow-x:auto;scrollbar-width:none}
.cat-tabs::-webkit-scrollbar{display:none}
.cat-tab{
  padding:12px 0;font-size:14.5px;color:rgba(35,40,36,.58);white-space:nowrap;
  border-bottom:2px solid transparent;transition:all 160ms var(--ease);
}
.cat-tab:hover{color:var(--ink-900)}
.cat-tab.active{color:var(--ink-900);border-bottom-color:var(--clay-600);font-weight:600}

/* ============ 正文两栏 ============ */
.cat-main{padding:64px 0 8px;flex:1}
.toc{position:sticky;top:32px}
.toc-title{
  font-size:12.5px;letter-spacing:.12em;color:var(--text-2);
  margin:0 0 16px;font-family:var(--sans);
}
.toc a{
  display:block;padding:11px 0 11px 14px;font-size:14.5px;color:var(--text-2);
  border-left:2px solid var(--line-soft);line-height:1.5;
}
.toc a:hover{color:var(--ink-900);border-left-color:var(--ink-500)}
.toc a.active{color:var(--ink-900);border-left-color:var(--clay-600);font-weight:600}

.c-block{padding-bottom:52px;margin-bottom:52px;border-bottom:1px solid var(--line-soft)}
.c-block:last-child{border-bottom:0;margin-bottom:0;padding-bottom:16px}
.c-block .sec-no{
  font-family:var(--serif);font-size:14px;color:var(--clay-600);
  letter-spacing:.16em;margin:0 0 12px;font-variant-numeric:tabular-nums;
}
.c-block h2{font-size:32px;font-weight:700;letter-spacing:.02em;margin-bottom:20px}
.c-block h3{font-size:20px;margin:34px 0 12px}
.c-block p{color:var(--text);margin-bottom:1.2em}
.c-block p.muted{color:var(--text-2);font-size:15.5px}

.bullets{margin:24px 0 0;display:grid;gap:12px}
.bullets li{
  position:relative;padding-left:20px;font-size:15.5px;line-height:1.8;color:var(--text);
}
.bullets li::before{
  content:"";position:absolute;left:0;top:.68em;
  width:6px;height:6px;background:var(--ink-500);border-radius:1px;
}

.c-figure{margin:30px 0 0}
.c-figure img{
  width:100%;aspect-ratio:16/10;object-fit:cover;border-radius:4px;
  border:1px solid var(--line);
}
.c-figure figcaption{
  margin-top:10px;font-size:13px;color:var(--text-2);text-align:center;
}

.data-bar{
  display:flex;flex-wrap:wrap;gap:36px;margin-top:30px;
  padding:22px 26px;background:var(--paper-2);border-left:3px solid var(--clay-600);
}
.data-item{min-width:110px}
.data-num{
  font-family:var(--serif);font-size:32px;line-height:1.1;color:var(--ink-900);
  font-variant-numeric:tabular-nums;
}
.data-num small{font-size:15px;margin-left:4px;font-family:var(--sans);color:var(--text-2)}
.data-lbl{font-size:13px;color:var(--text-2);margin:6px 0 0;line-height:1.5}

.note-line{
  margin-top:26px;padding:18px 22px;border:1px dashed var(--line);
  border-radius:4px;font-size:15px;color:var(--text-2);background:transparent;
}

/* ============ 结尾 CTA ============ */
.end-cta{background:var(--ink-900);color:var(--text-inv);padding:72px 0 76px;margin-top:72px}
.end-cta h2{color:#fff;font-size:32px;margin-bottom:16px}
.end-cta p{color:rgba(246,242,234,.72);font-size:15.5px;margin-bottom:0}
.end-cta .cta-actions{margin-top:28px;display:flex;flex-wrap:wrap;gap:14px}

.mini-form{margin-top:8px}
.f-label{display:block;font-size:13px;color:rgba(246,242,234,.62);margin-bottom:8px;letter-spacing:.02em}
.f-input{
  width:100%;background:transparent;border:0;border-bottom:1px solid rgba(246,242,234,.28);
  color:#fff;font-size:15px;padding:8px 2px 10px;font-family:var(--sans);
  transition:border-color 160ms var(--ease);
}
.f-input::placeholder{color:rgba(246,242,234,.35)}
.f-input:focus{outline:none;border-bottom:2px solid var(--clay-600);padding-bottom:9px}
textarea.f-input{resize:vertical;min-height:74px;line-height:1.7}
.f-check{
  display:flex;align-items:flex-start;gap:10px;font-size:13.5px;
  color:rgba(246,242,234,.66);line-height:1.6;cursor:pointer;min-height:44px;
}
.f-check input{margin-top:6px;accent-color:var(--clay-600);width:15px;height:15px;flex:0 0 15px}
.f-hint{font-size:13px;color:rgba(246,242,234,.5);margin:12px 0 0}

/* ============ 按钮 ============ */
.btn-clay,.btn-ghost{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-size:15px;font-weight:600;padding:13px 26px;border-radius:2px;
  border:1px solid transparent;cursor:pointer;
  transition:all 160ms var(--ease);min-height:44px;
}
.btn-clay{background:var(--clay-600);border-color:var(--clay-600);color:#fff}
.btn-clay:hover{background:var(--clay-700);border-color:var(--clay-700);color:#fff;transform:translateY(-1px);box-shadow:0 6px 16px rgba(194,96,60,.24)}
.btn-clay:active{transform:translateY(0);box-shadow:none}
.btn-ghost{background:transparent;border-color:var(--ink-900);color:var(--ink-900)}
.btn-ghost:hover{background:var(--ink-900);color:var(--text-inv)}
.btn-ghost.inv{border-color:rgba(246,242,234,.5);color:var(--text-inv)}
.btn-ghost.inv:hover{background:var(--text-inv);color:var(--ink-900);border-color:var(--text-inv)}

.txt-link{
  display:inline-flex;align-items:center;gap:6px;font-size:15px;
  color:var(--ink-500);font-weight:500;
}
.txt-link i{font-size:12px;transition:transform 160ms var(--ease)}
.txt-link:hover{color:var(--clay-600);text-decoration:underline;text-underline-offset:4px}
.txt-link:hover i{transform:translateX(4px)}

/* ============ 页脚 ============ */
.site-foot{background:var(--ink-900);color:var(--text-inv);padding:72px 0 0;margin-top:0}
.site-foot h4{
  font-family:var(--sans);font-size:13px;letter-spacing:.1em;
  color:rgba(246,242,234,.55);margin:0 0 20px;font-weight:600;
}
.f-brand{font-family:var(--serif);font-size:22px;color:#fff;font-weight:700;line-height:1.3}
.f-desc{margin:16px 0 0;font-size:14px;line-height:1.8;color:rgba(246,242,234,.6);max-width:32ch}
.f-links li,.f-contact li{margin-bottom:12px;font-size:14px;line-height:1.6}
.f-links a{color:rgba(246,242,234,.7)}
.f-links a:hover{color:#fff}.f-contact li{color:rgba(246,242,234,.62)}
.foot-bar{
  margin-top:60px;padding:22px 0 26px;border-top:1px solid rgba(246,242,234,.14);
  display:flex;flex-wrap:wrap;gap:14px 32px;font-size:12.5px;color:rgba(246,242,234,.5);
}

/* ============ 返回顶部 ============ */
.to-top{
  position:fixed;right:22px;bottom:22px;width:40px;height:40px;z-index:1030;
  background:transparent;border:1px solid var(--ink-900);border-radius:2px;
  color:var(--ink-900);display:inline-flex;align-items:center;justify-content:center;
  font-size:14px;cursor:pointer;opacity:0;pointer-events:none;
  transition:all 160ms var(--ease);
}
.to-top.show{opacity:1;pointer-events:auto}
.to-top:hover{background:var(--ink-900);color:var(--text-inv)}

/* ============ 响应式 ============ */
@media (max-width:1399.98px){}
@media (max-width:1199.98px){
  :root{--nav-w:206px}
  .cat-hero h1{font-size:38px}
  .c-block h2{font-size:28px}
}
@media (max-width:991.98px){
  .site-nav{display:none}
  .site-main{margin-left:0}
  .mobile-bar{display:flex}
  .to-top{right:16px;bottom:16px;width:36px;height:36px}
  .cat-hero{padding-top:44px}
  .cat-hero h1{font-size:32px;max-width:100%}
  .cat-main{padding-top:48px}
  .toc{position:static;margin-bottom:36px;padding-bottom:24px;border-bottom:1px solid var(--line-soft)}
  .toc a{display:inline-block;margin-right:18px;border-left:0;border-bottom:2px solid var(--line-soft);padding:8px 2px}
  .toc a:hover,.toc a.active{border-left:0;border-bottom-color:var(--clay-600)}
  .toc-title{margin-bottom:10px}
  .data-bar{gap:26px;padding:20px}
  .end-cta{padding:56px 0 60px;margin-top:56px}
  .site-foot{padding-top:56px}
  .foot-bar{margin-top:44px}
}
@media (max-width:767.98px){
  body{font-size:16px}
  .container{padding-left:20px;padding-right:20px}
  .cat-hero h1{font-size:26px}
  .cat-lead{font-size:15px}
  .c-block{padding-bottom:40px;margin-bottom:40px}
  .c-block h2{font-size:23px}
  .c-block h3{font-size:18px}
  .data-bar{gap:22px}
  .data-num{font-size:27px}
  .c-figure img{aspect-ratio:16/10}
  .end-cta h2{font-size:24px}
  .foot-bar{flex-direction:column;gap:10px}
}
@media (max-width:575.98px){
  .cat-hero{padding-top:36px}
  .cat-tab{font-size:14px}
  .btn-clay,.btn-ghost{width:100%}
  .end-cta .cta-actions{flex-direction:column}
}

/* roulang page: category2 */
:root{
  --ink-900:#12332C;
  --ink-700:#1E4A40;
  --ink-500:#2F6A5C;
  --clay-600:#C2603C;
  --clay-700:#A34C2C;
  --sage-300:#9BB8AF;
  --paper:#F6F2EA;
  --paper-2:#EDE7DB;
  --line:#DCD3C4;
  --line-soft:#E9E3D7;
  --text:#232824;
  --text-2:#5C635D;
  --text-inv:#F6F2EA;
  --serif:'Noto Serif SC','Source Han Serif SC','Songti SC',serif;
  --sans:system-ui,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  --r-card:4px;
  --r-btn:2px;
  --t:160ms cubic-bezier(.2,.7,.3,1);
  --bs-body-bg:#F6F2EA;
  --bs-body-color:#232824;
  --bs-primary:#C2603C;
  --bs-border-radius:4px;
  --bs-font-sans-serif:system-ui,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  --bs-link-color:#1E4A40;
  --bs-link-hover-color:#C2603C;
  --bs-body-font-size:16.5px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--paper);
  color:var(--text);
  font-family:var(--sans);
  font-size:16.5px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none;transition:color var(--t),background-color var(--t),border-color var(--t),transform var(--t)}
a:hover{color:var(--clay-600)}
p{margin:0 0 1.2em;max-width:68ch}
h1,h2,h3,h4,h5{font-family:var(--serif);font-weight:600;line-height:1.3;margin:0;color:var(--ink-900)}
ul,ol{margin:0;padding:0;list-style:none}
button{font-family:inherit}
:focus-visible{outline:2px solid var(--clay-600);outline-offset:2px}
::selection{background:rgba(194,96,60,.18)}

/* ---------- 壳层：桌面左栏 ---------- */
.side-nav{
  position:fixed;top:0;left:0;width:240px;height:100vh;
  background:var(--ink-900);color:var(--text-inv);
  display:flex;flex-direction:column;
  padding:28px 20px 24px;z-index:1040;overflow-y:auto;
}
.side-brand{border-bottom:1px solid rgba(246,242,234,.18);padding-bottom:18px;margin-bottom:18px}
.brand-mark{
  display:block;font-family:var(--serif);font-size:19px;font-weight:700;
  letter-spacing:.01em;color:var(--text-inv);word-break:break-word;
}
.brand-mark:hover{color:var(--text-inv)}
.brand-sub{font-size:12.5px;color:rgba(246,242,234,.6);letter-spacing:.12em;margin:8px 0 0;font-family:var(--sans)}
.side-menu{display:flex;flex-direction:column;gap:2px;flex:1}
.side-link{
  position:relative;display:flex;align-items:center;gap:12px;
  padding:11px 12px 11px 15px;font-size:14.5px;line-height:1.5;
  color:rgba(246,242,234,.72);border-radius:var(--r-btn);
}
.side-link i{width:18px;text-align:center;font-size:14px;flex:none}
.side-link:hover{color:var(--text-inv);background:var(--ink-700)}
.side-link.active{color:var(--text-inv);background:rgba(246,242,234,.07)}
.side-link.active::before{
  content:"";position:absolute;left:0;top:9px;bottom:9px;width:3px;
  background:var(--clay-600);border-radius:2px;transition:width var(--t);
}
.side-link.active:hover::before{width:3px}
.side-group{margin-top:18px;padding-top:14px;border-top:1px solid rgba(246,242,234,.14)}
.side-group-title{
  font-family:var(--sans);font-size:12px;letter-spacing:.16em;
  color:rgba(246,242,234,.5);margin:0 0 10px 15px;
}
.side-foot{margin-top:20px;padding-top:18px;border-top:1px solid rgba(246,242,234,.18)}
.side-foot .text-link{color:var(--text-inv);font-size:14.5px;font-weight:600;display:inline-flex;align-items:center;gap:6px}
.side-foot .text-link .arw{transition:transform var(--t)}
.side-foot .text-link:hover{color:var(--clay-600)}
.side-foot .text-link:hover .arw{transform:translateX(4px)}
.side-contact{font-size:12.5px;line-height:1.7;color:rgba(246,242,234,.55);margin:12px 0 0}

/* ---------- 壳层：移动顶栏 ---------- */
.top-bar{
  display:none;position:sticky;top:0;z-index:1030;height:56px;
  background:var(--ink-900);color:var(--text-inv);
  align-items:center;justify-content:space-between;padding:0 10px;
}
.burger{
  width:44px;height:44px;background:none;border:0;color:var(--text-inv);
  font-size:18px;display:grid;place-items:center;border-radius:var(--r-btn);
}
.burger:hover{background:var(--ink-700);color:var(--text-inv)}
.top-brand{font-family:var(--serif);font-size:15px;font-weight:700;color:var(--text-inv);letter-spacing:.01em}
.top-brand:hover{color:var(--text-inv)}
.top-cta{
  width:44px;height:44px;display:grid;place-items:center;
  background:var(--clay-600);color:#fff;border-radius:var(--r-btn);font-size:15px;
}
.top-cta:hover{background:var(--clay-700);color:#fff}

/* ---------- 抽屉 ---------- */
.drawer{background:var(--ink-900);color:var(--text-inv);width:80vw;max-width:320px;border:0}
.drawer .offcanvas-header{border-bottom:1px solid rgba(246,242,234,.16);padding:14px 18px}
.drawer .offcanvas-body{padding:18px;display:flex;flex-direction:column;gap:6px}
.drawer-brand{font-family:var(--serif);font-size:17px;font-weight:700;color:var(--text-inv)}
.drawer-close{width:44px;height:44px;background:none;border:0;color:var(--text-inv);font-size:18px;border-radius:var(--r-btn)}
.drawer-close:hover{background:var(--ink-700);color:var(--text-inv)}
.drawer .side-link{font-size:15px;padding:13px 12px 13px 15px}
.drawer .side-group-title{margin-left:15px}
.drawer-foot{margin-top:auto;padding-top:18px;border-top:1px solid rgba(246,242,234,.18);font-size:13px;color:rgba(246,242,234,.6);line-height:1.8}
.offcanvas-backdrop{background-color:rgba(18,51,44,.45)}

/* ---------- 主内容 ---------- */
.app-main{margin-left:240px;min-height:100vh;display:flex;flex-direction:column}
.container{max-width:1200px;padding-left:24px;padding-right:24px}

/* Hero */
.cat-hero{background:var(--paper-2);border-bottom:1px solid var(--line);padding:52px 0 44px}
.crumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:14px;color:var(--text-2);margin:0 0 18px}
.crumb a{color:var(--text-2)}
.crumb a:hover{color:var(--clay-600)}
.crumb .sep{color:var(--line);opacity:.9}
.cat-hero h1{
  font-size:clamp(27px,3.2vw,38px);letter-spacing:.01em;
  max-width:24ch;color:var(--ink-900);
}
.hero-lead{margin:16px 0 0;font-size:16px;color:var(--text-2);max-width:46ch}

/* Tabs */
.tabs-bar{background:var(--paper);border-bottom:1px solid var(--line-soft);position:sticky;top:0;z-index:1020}
.cat-tabs{display:flex;gap:32px;overflow-x:auto;scrollbar-width:none;-ms-overflow-style:none}
.cat-tabs::-webkit-scrollbar{display:none}
.cat-tabs a{
  padding:16px 0;font-size:15px;white-space:nowrap;
  color:var(--text-2);border-bottom:2px solid transparent;opacity:.72;
}
.cat-tabs a:hover{color:var(--ink-900);opacity:1}
.cat-tabs a.is-active{color:var(--ink-900);border-bottom-color:var(--clay-600);opacity:1;font-weight:600}

/* 内容 */
.sec-wrap{padding:64px 0 0}
.content-narrow{max-width:860px;margin:0 auto}
.sec{padding:56px 0;border-bottom:1px solid var(--line-soft)}
.sec:first-child{padding-top:8px}
.sec:last-child{border-bottom:0;padding-bottom:24px}
.sec-num{
  display:block;font-family:var(--serif);font-size:56px;line-height:1;
  color:var(--sage-300);font-variant-numeric:tabular-nums;margin-bottom:14px;
}
.sec h2{font-size:30px;letter-spacing:.02em;margin-bottom:18px}
.sec p{font-size:16.5px}
.pt-list{display:flex;flex-direction:column;gap:11px;margin:22px 0 10px}
.pt-list li{position:relative;padding-left:18px;font-size:15.5px;color:var(--text-2)}
.pt-list li::before{content:"";position:absolute;left:0;top:11px;width:6px;height:6px;background:var(--sage-300)}
.fig{margin:28px 0 10px}
.fig img{width:100%;aspect-ratio:16/10;object-fit:cover;border-radius:var(--r-card);border:1px solid var(--line)}
.fig figcaption{font-size:13px;color:var(--text-2);margin-top:10px;text-align:center}
.stat-strip{
  display:flex;flex-wrap:wrap;gap:24px;
  border:1px solid var(--line);border-radius:var(--r-card);
  background:var(--paper-2);padding:22px 26px;margin:26px 0 0;
}
.stat-strip > div{flex:1 1 150px}
.stat-strip b{
  display:block;font-family:var(--serif);font-size:30px;line-height:1.2;
  color:var(--ink-900);font-variant-numeric:tabular-nums;
}
.stat-strip span{font-size:13px;color:var(--text-2)}

/* 表格 */
.table-scroll{overflow-x:auto;margin:26px 0 0;border-radius:var(--r-card)}
.price-table{width:100%;min-width:560px;border-collapse:collapse;border:1px solid var(--line);font-size:15px;background:var(--paper)}
.price-table th,.price-table td{border-bottom:1px solid var(--line-soft);padding:14px 16px;text-align:left;vertical-align:top}
.price-table thead th{background:var(--paper-2);font-family:var(--serif);font-size:16px;font-weight:600;color:var(--ink-900)}
.price-table tbody tr:last-child td{border-bottom:0}
.price-table tbody td:first-child{color:var(--text-2);width:32%}
.price-table tbody tr:hover{background:var(--paper-2)}

/* 折叠问答 */
.qa{margin-top:28px;border-top:1px solid var(--line-soft)}
.qa .accordion-item{background:transparent;border:0;border-bottom:1px solid var(--line-soft)}
.qa .accordion-button{
  position:relative;background:transparent;border:0;box-shadow:none;
  padding:19px 44px 19px 0;font-size:16.5px;font-weight:600;
  color:var(--text);font-family:var(--sans);line-height:1.6;border-radius:0;
}
.qa .accordion-button:hover{color:var(--ink-500)}
.qa .accordion-button:focus{box-shadow:none;outline:2px solid var(--clay-600);outline-offset:-2px}
.qa .accordion-button:not(.collapsed){color:var(--ink-700);background:transparent}
.qa .accordion-button::after{
  content:"+";background-image:none;width:auto;height:auto;
  position:absolute;right:6px;top:50%;margin-top:-15px;
  font-size:21px;line-height:1;color:var(--clay-600);
  transition:transform var(--t);
}
.qa .accordion-button:not(.collapsed)::after{transform:rotate(45deg)}
.qa .accordion-body{padding:0 0 22px;font-size:15.5px;line-height:1.85;color:var(--text-2)}
.qa .accordion-body p:last-child{margin-bottom:0}

/* CTA */
.page-cta{background:var(--ink-900);color:var(--text-inv);padding:56px 0}
.page-cta .inner{display:flex;flex-wrap:wrap;gap:28px;align-items:center;justify-content:space-between}
.page-cta h2{font-size:26px;color:var(--text-inv);margin-bottom:10px}
.page-cta p{color:rgba(246,242,234,.75);margin:0;max-width:54ch}
.btn-clay{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  background:var(--clay-600);border:1px solid var(--clay-600);color:#fff;
  border-radius:var(--r-btn);padding:14px 26px;font-size:15px;font-weight:600;
  min-height:44px;transition:background-color var(--t),border-color var(--t),transform var(--t),box-shadow var(--t),color var(--t);
}
.btn-clay:hover{background:var(--clay-700);border-color:var(--clay-700);color:#fff;transform:translateY(-1px);box-shadow:0 6px 16px rgba(194,96,60,.24)}
.btn-clay:active{transform:translateY(0);box-shadow:none}
.btn-line{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  background:transparent;border:1px solid var(--ink-900);color:var(--ink-900);
  border-radius:var(--r-btn);padding:14px 26px;font-size:15px;font-weight:600;min-height:44px;
  transition:background-color var(--t),color var(--t),transform var(--t);
}
.btn-line:hover{background:var(--ink-900);color:var(--text-inv);transform:translateY(-1px)}
.btn-line-inv{background:transparent;border:1px solid rgba(246,242,234,.5);color:var(--text-inv)}
.btn-line-inv:hover{background:var(--text-inv);color:var(--ink-900);border-color:var(--text-inv)}
.text-link{display:inline-flex;align-items:center;gap:6px;font-size:14.5px;font-weight:600;color:var(--ink-700)}
.text-link .arw{transition:transform var(--t)}
.text-link:hover{color:var(--clay-600);text-decoration:underline;text-underline-offset:3px}
.text-link:hover .arw{transform:translateX(4px)}

/* 页脚 */
.site-foot{background:var(--ink-900);color:rgba(246,242,234,.8);padding:64px 0 0;margin-top:auto}
.f-brand{font-family:var(--serif);font-size:20px;font-weight:700;color:var(--text-inv);margin-bottom:14px}
.f-desc{font-size:14.5px;color:rgba(246,242,234,.68);max-width:34ch;margin:0}
.site-foot h4{font-family:var(--sans);font-size:14px;letter-spacing:.1em;color:var(--text-inv);margin:0 0 16px}
.f-links li{margin-bottom:10px}
.f-links a{font-size:14.5px;color:rgba(246,242,234,.72)}
.f-links a:hover{color:var(--clay-600)}
.f-contact li{font-size:14px;color:rgba(246,242,234,.68);margin-bottom:9px;line-height:1.7}
.foot-bar{
  margin-top:48px;border-top:1px solid rgba(246,242,234,.16);
  padding:20px 0;display:flex;flex-wrap:wrap;gap:10px 26px;
  font-size:13px;color:rgba(246,242,234,.58);
}

/* 返回顶部 */
.to-top{
  position:fixed;right:24px;bottom:24px;width:40px;height:40px;
  display:grid;place-items:center;background:var(--paper);
  border:1px solid var(--line);border-radius:var(--r-btn);
  color:var(--ink-900);z-index:1050;opacity:0;visibility:hidden;
  transition:opacity var(--t),visibility var(--t),background-color var(--t),color var(--t),border-color var(--t);
}
.to-top.show{opacity:1;visibility:visible}
.to-top:hover{background:var(--ink-900);color:var(--text-inv);border-color:var(--ink-900)}

/* 进入视口动效 */
.reveal{opacity:0;transform:translateY(12px);transition:opacity 320ms cubic-bezier(.2,.7,.3,1),transform 320ms cubic-bezier(.2,.7,.3,1)}
.reveal.in{opacity:1;transform:none}

/* 断点 */
@media (min-width:992px) and (max-width:1199.98px){
  .side-nav{width:80px;padding:22px 10px 18px}
  .side-link{justify-content:center;padding:13px 0;gap:0}
  .side-link span{display:none}
  .side-link::after{
    content:attr(data-tip);position:absolute;left:calc(100% + 12px);top:50%;
    transform:translateY(-50%);background:var(--ink-700);color:var(--text-inv);
    padding:6px 10px;border-radius:var(--r-btn);font-size:13px;white-space:nowrap;
    opacity:0;pointer-events:none;transition:opacity var(--t);z-index:1060;
  }
  .side-link:hover::after{opacity:1}
  .side-group-title,.brand-sub,.side-contact{display:none}
  .brand-mark{font-size:12px;line-height:1.4;text-align:center;letter-spacing:0}
  .side-foot{margin-top:14px;padding-top:14px;text-align:center}
  .side-foot .text-link{justify-content:center;font-size:0}
  .side-foot .text-link .arw{font-size:16px}
  .app-main{margin-left:80px}
}
@media (max-width:991.98px){
  .side-nav{display:none}
  .top-bar{display:flex}
  .app-main{margin-left:0}
  .tabs-bar{top:56px}
  .cat-hero{padding:40px 0 34px}
}
@media (max-width:767.98px){
  body{font-size:16px}
  .container{padding-left:20px;padding-right:20px}
  .cat-hero h1{font-size:26px}
  .hero-lead{font-size:15px}
  .sec{padding:44px 0}
  .sec h2{font-size:23px}
  .sec-num{font-size:44px}
  .sec-wrap{padding:44px 0 0}
  .cat-tabs{gap:24px}
  .stat-strip{padding:18px 20px;gap:18px}
  .stat-strip b{font-size:26px}
  .qa .accordion-button{font-size:16px;padding:16px 40px 16px 0}
  .page-cta{padding:44px 0}
  .page-cta h2{font-size:22px}
  .site-foot{padding-top:48px}
  .to-top{right:16px;bottom:16px;width:36px;height:36px}
  .foot-bar{margin-top:36px}
}
@media (max-width:575.98px){
  .cat-hero h1{font-size:23px}
  .btn-clay,.btn-line{width:100%}
  .page-cta .inner{flex-direction:column;align-items:flex-start}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:0ms !important;animation-duration:0ms !important}
  .reveal{opacity:1;transform:none}
}