/* roulang page: index */
:root{
  --ink-900:#0E1C1A;
  --brand-700:#14554B;
  --brand-500:#1E7A68;
  --brand-100:#E3F1EC;
  --accent-600:#D4552B;
  --accent-500:#E8763F;
  --accent-100:#FBE7DC;
  --paper:#F7F3EB;
  --surface:#FFFFFF;
  --line:#E4DDD0;
  --text-900:#1A1D1C;
  --text-600:#55605C;
  --text-400:#8A938F;
  --success:#2E7D5B;
  --warn:#B7791F;
  --danger:#B23A2E;
  --r-sm:10px;
  --r-md:14px;
  --r-lg:18px;
  --r-pill:999px;
  --sh-sm:0 1px 2px rgba(16,28,26,.06);
  --sh-md:0 6px 18px -6px rgba(16,28,26,.14);
  --sh-lg:0 18px 40px -18px rgba(16,28,26,.24);
  --grad:linear-gradient(135deg,#14554B 0%,#0E1C1A 100%);
  --font-cn:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--paper);
  color:var(--text-900);
  font-family:var(--font-cn);
  font-size:17px;
  line-height:1.8;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none;transition:color .2s ease,border-color .2s ease,background-color .2s ease}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer;background:none;border:none}
h1,h2,h3,h4{margin:0;line-height:1.35;font-weight:700;letter-spacing:.01em}
h1{font-size:clamp(30px,4.6vw,46px);line-height:1.25}
h2{font-size:clamp(24px,3.2vw,32px)}
h3{font-size:20px;line-height:1.4;font-weight:600}
h4{font-size:17px;line-height:1.5;font-weight:600}
p{margin:0 0 1em}
ul{margin:0;padding:0;list-style:none}
:focus-visible{outline:2px solid var(--brand-500);outline-offset:2px;border-radius:4px}

.container{width:100%;max-width:1200px;margin:0 auto;padding-left:20px;padding-right:20px}
@media(min-width:768px){.container{padding-left:24px;padding-right:24px}}

.section{padding-top:44px;padding-bottom:44px}
@media(min-width:768px){.section{padding-top:64px;padding-bottom:64px}}
@media(min-width:1024px){.section{padding-top:88px;padding-bottom:88px}}

.sec-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:14px;margin-bottom:28px}
.sec-head .sec-kicker{display:inline-flex;align-items:center;gap:8px;font-size:12px;font-weight:600;letter-spacing:.06em;color:var(--brand-700);background:var(--brand-100);border-radius:var(--r-pill);padding:5px 12px;margin-bottom:12px}
.sec-head h2{max-width:760px}
.sec-desc{margin:10px 0 0;color:var(--text-600);font-size:16px;max-width:680px}
.link-more{font-size:15px;font-weight:600;color:var(--brand-700);border-bottom:1.5px solid transparent;padding-bottom:2px}
.link-more:hover{border-bottom-color:var(--brand-700)}

/* 按钮 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-weight:600;font-size:16px;line-height:1;border-radius:var(--r-pill);padding:14px 26px;transition:transform .2s ease,box-shadow .2s ease,background-color .2s ease,border-color .2s ease,color .2s ease;white-space:nowrap}
.btn-primary{background:var(--accent-600);color:#fff;box-shadow:var(--sh-sm)}
.btn-primary:hover{background:#BF4A24;transform:translateY(-1px);box-shadow:var(--sh-md)}
.btn-primary:active{transform:translateY(0);box-shadow:var(--sh-sm)}
.btn-ghost{background:transparent;color:var(--brand-700);border:1.5px solid var(--brand-700);border-radius:12px;padding:12.5px 24px}
.btn-ghost:hover{background:var(--brand-100)}
.btn-light{background:#fff;color:var(--brand-700);border:1.5px solid rgba(255,255,255,.5)}
.btn-light:hover{background:var(--brand-100);border-color:var(--brand-100)}
.btn-sm{padding:11px 20px;font-size:15px}

/* 徽章 */
.badge{display:inline-flex;align-items:center;gap:6px;font-size:12px;font-weight:600;line-height:1.4;border-radius:var(--r-pill);padding:5px 12px}
.badge-brand{background:var(--brand-100);color:var(--brand-700)}
.badge-accent{background:var(--accent-100);color:var(--accent-600)}
.badge-line{background:rgba(255,255,255,.12);color:#DCEAE5;border:1px solid rgba(255,255,255,.22)}

/* 顶部导航 */
.site-header{position:sticky;top:0;z-index:60;background:var(--surface);border-bottom:1px solid var(--line);transition:box-shadow .2s ease,background-color .2s ease}
.site-header.is-scrolled{box-shadow:var(--sh-sm)}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;height:68px}
.logo{display:inline-flex;align-items:center;gap:10px;font-weight:700;font-size:17px;color:var(--ink-900);letter-spacing:.01em}
.logo-mark{width:36px;height:36px;border-radius:11px;background:var(--grad);display:inline-flex;align-items:center;justify-content:center;color:#fff;font-size:15px;font-weight:700;flex-shrink:0}
.nav-links{display:none;align-items:center;gap:4px}
@media(min-width:900px){.nav-links{display:flex}}
.nav-links a{font-size:15px;font-weight:500;color:var(--text-600);padding:9px 14px;border-radius:var(--r-pill);transition:background-color .2s ease,color .2s ease}
.nav-links a:hover{background:var(--brand-100);color:var(--brand-700)}
.nav-links a.is-active{background:var(--brand-100);color:var(--brand-700);font-weight:600}
.header-cta{display:none}
@media(min-width:900px){.header-cta{display:inline-flex}}

/* Hero */
.hero{position:relative;background:var(--ink-900);overflow:hidden;color:#fff}
.hero-bg{position:absolute;inset:0;background-image:url('/assets/images/backpic/back-1.webp');background-size:cover;background-position:center;opacity:.42}
.hero-veil{position:absolute;inset:0;background:linear-gradient(135deg,rgba(20,85,75,.92) 0%,rgba(14,28,26,.9) 70%)}
.hero-inner{position:relative;z-index:2;padding-top:52px;padding-bottom:56px}
@media(min-width:1024px){.hero-inner{padding-top:86px;padding-bottom:92px}}
.hero-grid{display:grid;gap:36px}
@media(min-width:1024px){.hero-grid{grid-template-columns:7fr 5fr;align-items:center;gap:48px}}
.hero h1{color:#fff;margin-bottom:16px}
.hero-sub{font-size:17px;line-height:1.75;color:#CFE0DA;max-width:560px;margin-bottom:26px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-bottom:28px}
.hero-trust{display:flex;gap:10px;overflow-x:auto;padding-bottom:6px;scroll-snap-type:x mandatory;-ms-overflow-style:none;scrollbar-width:none}
.hero-trust::-webkit-scrollbar{display:none}
.hero-trust span{flex:0 0 auto;scroll-snap-align:start}
.hero-panel{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.16);border-radius:var(--r-lg);padding:18px;backdrop-filter:none}
.hero-panel img{border-radius:var(--r-md);width:100%;height:220px;object-fit:cover}
.hero-panel-cap{font-size:14px;color:#B9CEC7;margin:12px 2px 0}
.hero-panel-rows{margin-top:16px;display:grid;gap:10px}
.hero-panel-row{display:flex;align-items:center;justify-content:space-between;gap:12px;background:rgba(14,28,26,.5);border:1px solid rgba(255,255,255,.12);border-radius:var(--r-sm);padding:11px 14px}
.hero-panel-row strong{font-size:15px;color:#fff;font-weight:600}
.hero-panel-row em{font-style:normal;font-size:13px;color:#9FBAB2}

/* 板块通用 */
.band{background:var(--surface);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}

/* 分类入口卡 */
.cat-grid{display:grid;gap:20px}
@media(min-width:768px){.cat-grid{grid-template-columns:repeat(3,1fr)}}
.cat-card{display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);padding:22px;box-shadow:var(--sh-sm);transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease;height:100%}
.cat-card:hover{transform:translateY(-4px);border-color:var(--brand-500);box-shadow:var(--sh-md)}
.cat-card .cat-num{font-size:13px;font-weight:700;color:var(--text-400);letter-spacing:.08em}
.cat-card h3{margin:12px 0 8px;color:var(--ink-900)}
.cat-card p{font-size:15.5px;color:var(--text-600);margin-bottom:18px}
.cat-card .cat-foot{margin-top:auto;font-size:15px;font-weight:600;color:var(--brand-700)}
.cat-card:hover .cat-foot{color:var(--accent-600)}

/* 卖点错列 */
.feature-grid{display:grid;gap:20px}
@media(min-width:1024px){.feature-grid{grid-template-columns:1.15fr 1fr;gap:24px}}
.feature-main{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--sh-sm);padding:24px;display:flex;flex-direction:column;transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease}
.feature-main:hover{transform:translateY(-4px);border-color:var(--brand-500);box-shadow:var(--sh-md)}
.feature-main img{border-radius:var(--r-md);height:236px;width:100%;object-fit:cover;margin-bottom:20px}
.feature-side{display:grid;gap:20px}
.feature-sub{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--sh-sm);padding:22px;transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease}
.feature-sub:hover{transform:translateY(-4px);border-color:var(--brand-500);box-shadow:var(--sh-md)}
.icon-box{width:44px;height:44px;border-radius:12px;background:var(--brand-100);color:var(--brand-700);display:inline-flex;align-items:center;justify-content:center;margin-bottom:14px}
.icon-box.alt{background:var(--accent-100);color:var(--accent-600)}
.feature-main h3,.feature-sub h3{margin-bottom:10px}
.feature-main p,.feature-sub p{font-size:15.5px;color:var(--text-600);margin-bottom:14px}
.text-link{font-size:15px;font-weight:600;color:var(--brand-700);text-decoration:underline;text-underline-offset:4px;text-decoration-thickness:1.5px}
.text-link:hover{color:var(--accent-600)}

/* 场景交替图文 */
.step{display:grid;gap:24px;align-items:center;padding:26px 0;border-bottom:1px solid var(--line)}
.step:last-child{border-bottom:none}
@media(min-width:768px){
  .step{grid-template-columns:7fr 5fr;gap:36px;padding:34px 0}
  .step.reverse{grid-template-columns:5fr 7fr}
  .step.reverse .step-media{order:-1}
}
.step-media img{border-radius:var(--r-md);width:100%;height:250px;object-fit:cover;border:1px solid var(--line)}
.step-num{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:var(--r-pill);background:var(--brand-700);color:#fff;font-size:14px;font-weight:700;margin-bottom:14px}
.step h3{margin-bottom:10px}
.step p{font-size:15.5px;color:var(--text-600);margin-bottom:12px}
.step-list li{position:relative;padding-left:18px;font-size:15px;color:var(--text-600);line-height:1.7;margin-bottom:10px}
.step-list li::before{content:"";position:absolute;left:0;top:11px;width:6px;height:6px;background:var(--brand-500);border-radius:2px}
.step figcaption{font-size:14px;color:var(--text-400);margin-top:10px}

/* 最新信息 CMS */
.news-grid{display:grid;grid-template-columns:1fr;gap:20px}
@media(min-width:768px){.news-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.news-grid{grid-template-columns:repeat(3,1fr)}}
.news-card{display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--sh-sm);overflow:hidden;height:100%;transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease}
.news-card:hover{transform:translateY(-4px);border-color:var(--brand-500);box-shadow:var(--sh-md)}
.news-thumb{height:172px;background:linear-gradient(135deg,var(--brand-100),var(--accent-100));overflow:hidden}
.news-thumb img{width:100%;height:100%;object-fit:cover}
.news-body{padding:20px;display:flex;flex-direction:column;flex:1}
.news-body h3{font-size:18px;margin:12px 0 10px;color:var(--ink-900);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.news-body p{font-size:16px;line-height:1.75;color:var(--text-600);display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;margin-bottom:16px}
.news-foot{margin-top:auto;display:flex;align-items:center;justify-content:space-between;gap:12px;padding-top:14px;border-top:1px solid var(--line)}
.news-foot .arrow{font-size:15px;font-weight:600;color:var(--brand-700)}
.news-card:hover .arrow{color:var(--accent-600)}
.empty-card{grid-column:1/-1;border:1.5px dashed var(--line);border-radius:var(--r-lg);background:rgba(255,255,255,.6);padding:38px 24px;text-align:center;display:flex;flex-direction:column;align-items:center;gap:14px}
.empty-card .empty-icon{width:48px;height:48px;border-radius:14px;background:var(--brand-100);color:var(--brand-700);display:inline-flex;align-items:center;justify-content:center}
.empty-card p{color:var(--text-600);font-size:16px;margin:0}

/* 数据与评价 */
.stat-band{display:grid;gap:18px;background:var(--ink-900);border-radius:var(--r-lg);padding:28px 24px;color:#fff}
@media(min-width:768px){.stat-band{grid-template-columns:repeat(3,1fr);padding:34px 32px}}
.stat-band .stat strong{display:block;font-size:32px;font-weight:700;line-height:1.2;color:#fff;font-family:Inter,system-ui,sans-serif}
.stat-band .stat span{display:block;font-size:14.5px;color:#A9C1BA;margin-top:6px}
.quote-row{display:flex;gap:18px;overflow-x:auto;padding:6px 2px 10px;scroll-snap-type:x mandatory;margin-top:22px}
.quote-row::-webkit-scrollbar{height:6px}
.quote-row::-webkit-scrollbar-thumb{background:var(--line);border-radius:999px}
.quote-card{flex:0 0 88%;max-width:420px;scroll-snap-align:start;background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);padding:22px;box-shadow:var(--sh-sm)}
@media(min-width:768px){.quote-card{flex:0 0 calc(33.333% - 12px)}}
.quote-head{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.quote-avatar{width:40px;height:40px;border-radius:50%;background:var(--grad);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-size:15px;font-weight:600;flex-shrink:0}
.quote-head strong{display:block;font-size:15px;font-weight:600}
.quote-head em{font-style:normal;font-size:13px;color:var(--text-400)}
.quote-card p{font-size:15.5px;color:var(--text-600);margin:0;line-height:1.75}

/* FAQ */
.faq-list{border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;text-align:left;padding:20px 4px;font-size:17px;font-weight:600;color:var(--ink-900)}
.faq-q:hover{color:var(--brand-700)}
.faq-q .pm{flex-shrink:0;width:20px;height:20px;position:relative}
.faq-q .pm::before,.faq-q .pm::after{content:"";position:absolute;background:var(--brand-700);border-radius:2px;transition:transform .2s ease,opacity .2s ease}
.faq-q .pm::before{left:0;top:9px;width:20px;height:2px}
.faq-q .pm::after{left:9px;top:0;width:2px;height:20px}
.faq-item.is-open .pm::after{transform:scaleY(0);opacity:0}
.faq-a{display:none;background:var(--brand-100);border-left:3px solid var(--brand-700);border-radius:0 var(--r-sm) var(--r-sm) 0;padding:16px 20px;margin:0 0 18px}
.faq-a p{margin:0;font-size:16px;line-height:1.8;color:var(--text-600)}
.faq-item.is-open .faq-a{display:block}

/* CTA 通栏 */
.cta-band{background:var(--grad);border-radius:var(--r-lg);padding:32px 24px;color:#fff;display:grid;gap:20px;align-items:center}
@media(min-width:768px){.cta-band{grid-template-columns:1fr auto;padding:40px 40px}}
.cta-band h2{color:#fff;margin-bottom:10px}
.cta-band p{color:#CBDFD8;font-size:16px;margin:0;max-width:620px}

/* 页脚 */
.site-footer{background:var(--ink-900);color:#D7E3DE;padding-top:52px;margin-top:0}
.footer-grid{display:grid;gap:28px;padding-bottom:36px}
@media(min-width:768px){.footer-grid{grid-template-columns:1.4fr 1fr 1fr 1fr}}
.footer-brand .logo{color:#fff;margin-bottom:14px}
.footer-brand p{font-size:15px;color:#9FBAB2;max-width:320px;line-height:1.75}
.footer-col h4{color:#fff;font-size:15px;margin-bottom:14px;letter-spacing:.02em}
.footer-col li{margin-bottom:10px}
.footer-col a{font-size:15px;color:#B7CCC5}
.footer-col a:hover{color:#fff}
.footer-col .muted{font-size:15px;color:#B7CCC5}
.footer-bottom{border-top:1px solid rgba(255,255,255,.12);padding:20px 0 26px;display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;font-size:14px;color:#8FA8A1}

/* 移动底部 Tab */
.tabbar{position:fixed;left:0;right:0;bottom:0;z-index:80;display:flex;background:var(--surface);border-top:1px solid var(--line);height:calc(56px + env(safe-area-inset-bottom));padding-bottom:env(safe-area-inset-bottom);box-shadow:0 -2px 10px -6px rgba(16,28,26,.2)}
@media(min-width:768px){.tabbar{display:none}}
.tabbar a{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;font-size:11.5px;color:var(--text-600);position:relative;font-weight:500}
.tabbar a svg{width:24px;height:24px;stroke-width:1.8}
.tabbar a.is-active{color:var(--brand-700);font-weight:600}
.tabbar a.is-active::before{content:"";position:absolute;top:0;left:50%;transform:translateX(-50%);width:26px;height:2px;background:var(--brand-700);border-radius:0 0 3px 3px}

/* 固定转化条 */
.quick-actions{position:fixed;z-index:70;left:16px;right:16px;bottom:calc(56px + env(safe-area-inset-bottom) + 10px);display:flex;align-items:center;justify-content:space-between;gap:12px;background:var(--ink-900);border:1px solid rgba(255,255,255,.14);border-radius:var(--r-md);height:52px;padding:0 14px;box-shadow:var(--sh-lg);color:#fff}
.quick-actions .qa-text{font-size:14px;color:#C9DAD4;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}
.quick-actions .qa-link{font-size:14.5px;font-weight:600;color:#fff;background:var(--accent-600);border-radius:var(--r-pill);padding:9px 16px;flex-shrink:0}
.quick-actions .qa-link:hover{background:#BF4A24}
@media(min-width:768px){
  .quick-actions{left:auto;right:24px;bottom:24px;gap:10px;background:transparent;border:none;box-shadow:none;height:auto;padding:0}
  .quick-actions .qa-text{display:none}
  .quick-actions .qa-link{box-shadow:var(--sh-md);padding:13px 22px;font-size:15px}
  .to-top{display:inline-flex}
}
.to-top{display:none;align-items:center;justify-content:center;width:46px;height:46px;border-radius:50%;background:var(--surface);border:1px solid var(--line);color:var(--brand-700);box-shadow:var(--sh-md)}
.to-top:hover{background:var(--brand-100)}

@media(max-width:767px){
  main{padding-bottom:calc(108px + env(safe-area-inset-bottom))}
  .site-footer{padding-bottom:calc(8px + env(safe-area-inset-bottom))}
}

@media(prefers-reduced-motion:reduce){
  *{transition:none !important;animation:none !important;scroll-behavior:auto !important}
}

/* roulang page: article */
:root{
  --ink-900:#0E1C1A;
  --brand-700:#14554B;
  --brand-500:#1E7A68;
  --brand-100:#E3F1EC;
  --accent-600:#D4552B;
  --accent-500:#E8763F;
  --accent-100:#FBE7DC;
  --paper:#F7F3EB;
  --surface:#FFFFFF;
  --line:#E4DDD0;
  --text-900:#1A1D1C;
  --text-600:#55605C;
  --text-400:#8A938F;
  --success:#2E7D5B;
  --warn:#B7791F;
  --danger:#B23A2E;
  --r-sm:10px;
  --r-md:14px;
  --r-lg:18px;
  --r-pill:999px;
  --shadow-sm:0 1px 2px rgba(16,28,26,.06);
  --shadow-md:0 6px 18px -6px rgba(16,28,26,.14);
  --shadow-lg:0 18px 40px -18px rgba(16,28,26,.24);
  --font-cn:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
}
*{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body{
  margin:0;
  background:var(--paper);
  color:var(--text-900);
  font-family:var(--font-cn);
  font-size:17px;
  line-height:1.8;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
button{font-family:inherit;}
h1,h2,h3,h4{letter-spacing:.01em;}
:focus-visible{outline:2px solid var(--brand-500);outline-offset:2px;border-radius:6px;}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px;}
@media (min-width:768px){.container{padding:0 24px;}}
.section{padding:44px 0;}
@media (min-width:768px){.section{padding:64px 0;}}
@media (min-width:1024px){.section{padding:88px 0;}}

/* ---------- 页头 ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:var(--surface);
  border-bottom:1px solid var(--line);
  transition:box-shadow .2s ease,background .2s ease;
}
.site-header.is-scrolled{box-shadow:var(--shadow-sm);}
.nav-wrap{display:flex;align-items:center;gap:20px;height:70px;}
.logo{display:inline-flex;align-items:center;gap:10px;font-weight:700;font-size:17px;color:var(--text-900);}
.logo-mark{
  display:inline-flex;align-items:center;justify-content:center;
  width:34px;height:34px;border-radius:var(--r-sm);
  background:var(--brand-700);color:#fff;font-size:13px;font-weight:700;letter-spacing:.02em;
}
.nav-links{display:none;align-items:center;gap:4px;margin-left:auto;}
.nav-links a{
  padding:8px 14px;border-radius:var(--r-pill);font-size:15px;color:var(--text-600);
  transition:background .18s ease,color .18s ease;
}
.nav-links a:hover{background:var(--brand-100);color:var(--brand-700);}
.nav-links a.is-active{background:var(--brand-100);color:var(--brand-700);font-weight:600;}
.header-cta{display:none;}
@media (min-width:1024px){
  .nav-links{display:flex;}
  .header-cta{display:inline-flex;margin-left:8px;}
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-weight:600;font-size:15px;line-height:1;border-radius:var(--r-sm);
  border:1.5px solid transparent;cursor:pointer;padding:12px 22px;
  transition:transform .18s ease,background .18s ease,box-shadow .18s ease,color .18s ease,border-color .18s ease;
}
.btn-primary{background:var(--accent-600);color:#fff;border-radius:var(--r-pill);box-shadow:var(--shadow-sm);}
.btn-primary:hover{background:#BF4A24;transform:translateY(-1px);box-shadow:var(--shadow-md);}
.btn-primary:active{transform:none;}
.btn-secondary{background:transparent;color:var(--brand-700);border-color:var(--brand-700);}
.btn-secondary:hover{background:var(--brand-100);}
.btn-ghost{background:transparent;color:var(--text-600);border-color:var(--line);}
.btn-ghost:hover{background:var(--brand-100);color:var(--brand-700);border-color:var(--brand-500);}
.btn-sm{padding:9px 16px;font-size:14px;}
.btn-block{width:100%;}

/* ---------- 徽章 / 标签 ---------- */
.badge{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 12px;border-radius:var(--r-pill);
  font-size:12px;font-weight:600;line-height:1.4;
  background:var(--brand-100);color:var(--brand-700);
}
.badge-time{background:var(--accent-100);color:var(--accent-600);}
.chip{
  display:inline-flex;align-items:center;
  padding:6px 14px;border-radius:var(--r-pill);
  background:var(--surface);border:1px solid var(--line);
  font-size:13px;color:var(--text-600);
  transition:border-color .18s ease,color .18s ease,background .18s ease;
}
.chip:hover{border-color:var(--brand-500);color:var(--brand-700);background:var(--brand-100);}

/* ---------- 面包屑 ---------- */
.crumb-bar{background:var(--surface);border-bottom:1px solid var(--line);}
.breadcrumb{
  display:flex;align-items:center;flex-wrap:wrap;gap:8px;
  font-size:14px;color:var(--text-400);padding:14px 0;
}
.breadcrumb a{color:var(--text-600);}
.breadcrumb a:hover{color:var(--brand-700);}
.breadcrumb .sep{color:var(--line);}
.breadcrumb .current{color:var(--text-900);max-width:60vw;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}

/* ---------- 文章头 ---------- */
.article-head{padding:32px 0 8px;}
.article-head h1{
  font-size:clamp(26px,4vw,40px);line-height:1.3;font-weight:700;
  margin:16px 0 16px;color:var(--text-900);
}
.article-meta{display:flex;flex-wrap:wrap;align-items:center;gap:12px;font-size:14px;color:var(--text-400);}
.article-meta .dot{width:4px;height:4px;border-radius:50%;background:var(--line);}
.article-lead{
  margin-top:20px;padding:20px 22px;border-radius:var(--r-md);
  background:var(--surface);border:1px solid var(--line);border-left:3px solid var(--brand-700);
  color:var(--text-600);font-size:16px;line-height:1.8;
}

/* ---------- 布局 ---------- */
.article-layout{padding-bottom:24px;}
.article-main{min-width:0;}
@media (min-width:1024px){
  .article-layout{
    display:grid;grid-template-columns:minmax(0,760px) 320px;
    gap:48px;justify-content:center;align-items:start;
  }
}

/* ---------- 正文排版 ---------- */
.article-body{
  margin-top:28px;font-size:18px;line-height:1.9;color:var(--text-900);
  word-break:break-word;
}
.article-body p{margin:0 0 1em;}
.article-body h2{
  position:relative;font-size:clamp(22px,2.6vw,28px);line-height:1.35;font-weight:700;
  margin:40px 0 16px;padding-left:14px;
}
.article-body h2::before{
  content:"";position:absolute;left:0;top:.22em;bottom:.22em;width:4px;border-radius:2px;background:var(--brand-700);
}
.article-body h3{font-size:20px;line-height:1.4;font-weight:600;margin:28px 0 12px;}
.article-body h4{font-size:17px;line-height:1.5;font-weight:600;margin:20px 0 10px;}
.article-body ul,.article-body ol{margin:0 0 1em;padding-left:22px;line-height:1.85;}
.article-body li{margin-bottom:8px;}
.article-body ul li::marker{color:var(--brand-500);}
.article-body a{color:var(--brand-700);text-decoration:underline;text-underline-offset:4px;text-decoration-thickness:1px;}
.article-body a:hover{color:var(--accent-600);}
.article-body strong{font-weight:600;}
.article-body blockquote{
  margin:24px 0;padding:16px 20px;border-left:4px solid var(--accent-500);
  background:var(--accent-100);border-radius:0 var(--r-md) var(--r-md) 0;color:var(--text-900);
}
.article-body blockquote p:last-child{margin-bottom:0;}
.article-body img{border-radius:var(--r-md);margin:24px auto;}
.article-body figcaption{text-align:center;font-size:14px;color:var(--text-400);line-height:1.6;margin-top:8px;}
.article-body hr{border:0;border-top:1px solid var(--line);margin:32px 0;}
.article-body table{display:block;width:100%;overflow:hidden;border-collapse:collapse;border:1px solid var(--line);border-radius:var(--r-md);background:var(--surface);}
.article-body thead{display:none;}
.article-body tbody,.article-body tr,.article-body td{display:block;width:100%;}
.article-body tr{border-bottom:1px solid var(--line);padding:14px 18px;}
.article-body tr:last-child{border-bottom:0;}
.article-body td{border:0;padding:0;}
.article-body td:first-child{font-weight:600;color:var(--text-900);margin-bottom:4px;}
.article-body td:not(:first-child){color:var(--text-600);font-size:16px;}
.article-body code{
  background:var(--brand-100);color:var(--brand-700);
  padding:2px 6px;border-radius:6px;font-size:15px;
}

/* ---------- 空态 ---------- */
.article-empty{
  margin-top:28px;padding:40px 24px;text-align:center;
  background:var(--surface);border:1px dashed var(--line);border-radius:var(--r-lg);
}
.article-empty .empty-icon{
  width:48px;height:48px;margin:0 auto 16px;border-radius:var(--r-md);
  background:var(--brand-100);color:var(--brand-700);
  display:flex;align-items:center;justify-content:center;
}
.article-empty h2{font-size:22px;margin:0 0 10px;}
.article-empty p{color:var(--text-600);margin:0 0 20px;font-size:16px;}

/* ---------- 侧栏 ---------- */
.article-side{margin-top:36px;}
@media (min-width:1024px){
  .article-side{margin-top:56px;position:sticky;top:94px;}
}
.side-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:22px;box-shadow:var(--shadow-sm);margin-bottom:20px;
}
.side-card h3{font-size:16px;font-weight:600;margin:0 0 14px;}
.toc-list{list-style:none;margin:0;padding:0;border-left:2px solid var(--line);}
.toc-list li{margin:0;}
.toc-list a{
  display:block;padding:7px 0 7px 14px;margin-left:-2px;
  border-left:2px solid transparent;font-size:14px;line-height:1.6;color:var(--text-600);
  transition:color .18s ease,border-color .18s ease;
}
.toc-list a:hover{color:var(--brand-700);border-left-color:var(--brand-500);}
.toc-list a.is-current{color:var(--brand-700);font-weight:600;border-left-color:var(--brand-700);}
.toc-empty{font-size:14px;color:var(--text-400);}
.side-thumb{border-radius:var(--r-md);overflow:hidden;margin-bottom:14px;}
.side-thumb img{width:100%;height:150px;object-fit:cover;}
.side-card p{font-size:14px;line-height:1.7;color:var(--text-600);margin:0 0 16px;}

/* ---------- 标签 ---------- */
.tag-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:36px;}
.tag-row .label{font-size:14px;color:var(--text-400);margin-right:4px;align-self:center;}

/* ---------- 上下篇 ---------- */
.pager{display:grid;gap:16px;margin-top:28px;}
@media (min-width:768px){.pager{grid-template-columns:1fr 1fr;}}
.pager-card{
  display:block;padding:20px 22px;background:var(--surface);
  border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow-sm);
  transition:border-color .2s ease,transform .2s ease,box-shadow .2s ease;
}
.pager-card:hover{border-color:var(--brand-500);transform:translateY(-4px);box-shadow:var(--shadow-md);}
.pager-card .kicker{font-size:12px;font-weight:600;color:var(--accent-600);letter-spacing:.04em;}
.pager-card h3{font-size:16px;font-weight:600;line-height:1.5;margin:8px 0 6px;}
.pager-card p{margin:0;font-size:14px;color:var(--text-400);}

/* ---------- 相关推荐 ---------- */
.related-grid{display:grid;gap:20px;margin-top:24px;}
@media (min-width:768px){.related-grid{grid-template-columns:repeat(2,1fr);gap:24px;}}
@media (min-width:1024px){.related-grid{grid-template-columns:repeat(3,1fr);}}
.card{
  display:flex;flex-direction:column;background:var(--surface);
  border:1px solid var(--line);border-radius:var(--r-lg);
  box-shadow:var(--shadow-sm);overflow:hidden;
  transition:border-color .2s ease,transform .2s ease,box-shadow .2s ease;
}
.card:hover{border-color:var(--brand-500);transform:translateY(-4px);box-shadow:var(--shadow-md);}
.card-thumb{aspect-ratio:16/9;overflow:hidden;background:var(--brand-100);}
.card-thumb img{width:100%;height:100%;object-fit:cover;}
.card-body{padding:20px 22px 22px;display:flex;flex-direction:column;flex:1;}
.card-body h3{font-size:17px;font-weight:600;line-height:1.5;margin:12px 0 10px;}
.card-body p{font-size:15px;line-height:1.75;color:var(--text-600);margin:0 0 16px;}
.card-foot{margin-top:auto;display:flex;align-items:center;justify-content:space-between;font-size:13px;color:var(--text-400);}
.card-foot .arrow{color:var(--accent-600);font-weight:600;}

/* ---------- 区块标题 ---------- */
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;flex-wrap:wrap;margin-bottom:8px;}
.section-head h2{font-size:clamp(24px,3.2vw,32px);line-height:1.35;font-weight:700;margin:0;}
.section-head p{margin:10px 0 0;color:var(--text-600);font-size:16px;max-width:720px;}
.text-link{color:var(--brand-700);font-weight:600;font-size:15px;text-decoration:underline;text-underline-offset:4px;}
.text-link:hover{color:var(--accent-600);}

/* ---------- FAQ ---------- */
.faq-list{margin-top:24px;border-top:1px solid var(--line);}
.faq-item{border-bottom:1px solid var(--line);}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:20px 2px;background:none;border:0;cursor:pointer;text-align:left;
  font-size:17px;font-weight:600;color:var(--text-900);line-height:1.6;
}
.faq-q:hover{color:var(--brand-700);}
.faq-sign{
  flex:0 0 auto;width:22px;height:22px;border-radius:50%;
  background:var(--brand-100);color:var(--brand-700);
  display:flex;align-items:center;justify-content:center;font-size:15px;line-height:1;
  transition:transform .2s ease,background .2s ease;
}
.faq-item.is-open .faq-sign{background:var(--accent-100);color:var(--accent-600);transform:rotate(45deg);}
.faq-a{display:none;padding:0 20px 20px;border-left:3px solid var(--brand-700);background:var(--brand-100);margin:0 0 20px;border-radius:0 var(--r-sm) var(--r-sm) 0;font-size:16px;line-height:1.8;color:var(--text-600);}
.faq-item.is-open .faq-a{display:block;}

/* ---------- CTA 通栏 ---------- */
.cta-band{
  background:linear-gradient(135deg,var(--brand-700),var(--ink-900));
  color:#fff;padding:44px 0;
}
@media (min-width:768px){.cta-band{padding:56px 0;}}
.cta-inner{display:flex;flex-direction:column;gap:22px;align-items:flex-start;}
@media (min-width:768px){.cta-inner{flex-direction:row;align-items:center;justify-content:space-between;}}
.cta-inner h2{font-size:clamp(22px,2.8vw,30px);line-height:1.35;font-weight:700;margin:0 0 10px;color:#fff;}
.cta-inner p{margin:0;color:rgba(255,255,255,.78);font-size:16px;line-height:1.75;max-width:620px;}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--ink-900);color:rgba(255,255,255,.82);padding:56px 0 28px;font-size:15px;}
.footer-grid{display:grid;gap:32px;}
@media (min-width:768px){.footer-grid{grid-template-columns:1.5fr 1fr 1fr 1fr;gap:36px;}}
.footer-brand .logo{color:#fff;margin-bottom:14px;}
.footer-brand .logo-mark{background:var(--brand-500);color:#fff;}
.footer-brand p{margin:0;color:rgba(255,255,255,.66);font-size:14px;line-height:1.75;max-width:340px;}
.footer-col h4{font-size:15px;font-weight:600;color:#fff;margin:0 0 14px;}
.footer-col ul{list-style:none;margin:0;padding:0;}
.footer-col li{margin-bottom:10px;font-size:14px;line-height:1.7;}
.footer-col a{color:rgba(255,255,255,.7);transition:color .18s ease;}
.footer-col a:hover{color:#fff;text-decoration:underline;text-underline-offset:4px;}
.footer-col .muted{color:rgba(255,255,255,.55);}
.footer-bottom{
  margin-top:36px;padding-top:20px;border-top:1px solid rgba(255,255,255,.12);
  display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;
  font-size:13px;color:rgba(255,255,255,.5);
}

/* ---------- 移动底部 Tab ---------- */
.mobile-tabbar{
  display:none;position:fixed;left:0;right:0;bottom:0;z-index:60;
  height:calc(56px + env(safe-area-inset-bottom));
  padding-bottom:env(safe-area-inset-bottom);
  background:var(--surface);border-top:1px solid var(--line);
}
.mobile-tabbar .tab-item{
  flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;
  position:relative;font-size:11px;color:var(--text-600);
}
.mobile-tabbar .tab-item svg{width:22px;height:22px;stroke-width:1.8;}
.mobile-tabbar .tab-item.is-active{color:var(--brand-700);font-weight:600;}
.mobile-tabbar .tab-item.is-active::before{
  content:"";position:absolute;top:0;left:50%;transform:translateX(-50%);
  width:26px;height:2px;border-radius:0 0 2px 2px;background:var(--brand-700);
}
@media (max-width:767px){.mobile-tabbar{display:flex;}}

/* ---------- 固定转化条 ---------- */
.float-cta{
  position:fixed;right:24px;bottom:24px;z-index:55;
  display:flex;align-items:center;gap:12px;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-pill);
  padding:10px 14px;box-shadow:var(--shadow-md);
}
.float-cta .float-text{font-size:14px;color:var(--text-600);padding-left:6px;}
@media (max-width:767px){
  .float-cta{
    left:0;right:0;bottom:calc(56px + env(safe-area-inset-bottom));
    border-radius:0;border:0;border-top:1px solid rgba(255,255,255,.14);
    background:var(--ink-900);box-shadow:var(--shadow-lg);
    padding:0 16px;height:52px;justify-content:space-between;gap:10px;
  }
  .float-cta .float-text{color:rgba(255,255,255,.78);font-size:13px;padding-left:0;}
  .float-cta .back-top{display:none;}
  body{padding-bottom:calc(108px + env(safe-area-inset-bottom));}
}
@media (min-width:768px){
  body{padding-bottom:24px;}
}
.btn-ghost.on-dark{color:rgba(255,255,255,.85);border-color:rgba(255,255,255,.28);}
.btn-ghost.on-dark:hover{background:rgba(255,255,255,.12);color:#fff;border-color:rgba(255,255,255,.5);}

/* roulang page: category1 */
:root{
  --ink-900:#0E1C1A;
  --brand-700:#14554B;
  --brand-500:#1E7A68;
  --brand-100:#E3F1EC;
  --accent-600:#D4552B;
  --accent-500:#E8763F;
  --accent-100:#FBE7DC;
  --paper:#F7F3EB;
  --surface:#FFFFFF;
  --line:#E4DDD0;
  --text-900:#1A1D1C;
  --text-600:#55605C;
  --text-400:#8A938F;
  --success:#2E7D5B;
  --warn:#B7791F;
  --danger:#B23A2E;
  --r-sm:10px;
  --r-md:14px;
  --r-lg:18px;
  --r-pill:999px;
  --sh-sm:0 1px 2px rgba(16,28,26,.06);
  --sh-md:0 6px 18px -6px rgba(16,28,26,.14);
  --sh-lg:0 18px 40px -18px rgba(16,28,26,.24);
  --grad:linear-gradient(135deg,var(--brand-700),var(--ink-900));
  --font-cn:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--paper);
  color:var(--text-900);
  font-family:var(--font-cn);
  font-size:17px;
  line-height:1.8;
  letter-spacing:.01em;
  padding-bottom:calc(108px + env(safe-area-inset-bottom));
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
button{font-family:inherit;}
h1,h2,h3,h4{margin:0;line-height:1.35;font-weight:700;color:var(--text-900);}
h1{font-size:clamp(30px,4.6vw,46px);line-height:1.25;}
h2{font-size:clamp(24px,3.2vw,32px);}
h3{font-size:20px;line-height:1.4;font-weight:600;}
h4{font-size:17px;line-height:1.5;font-weight:600;}
p{margin:0 0 1em;}
p:last-child{margin-bottom:0;}
ul,ol{margin:0;padding:0;list-style:none;}
:focus-visible{outline:2px solid var(--brand-500);outline-offset:2px;border-radius:6px;}

.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px;}
@media (min-width:1024px){.container{padding:0 24px;}}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-size:15px;font-weight:600;line-height:1;
  padding:13px 24px;border-radius:var(--r-pill);
  border:1.5px solid transparent;cursor:pointer;
  transition:all .2s ease-out;white-space:nowrap;
}
.btn-primary{background:var(--accent-600);color:#fff;box-shadow:var(--sh-sm);}
.btn-primary:hover{background:#BF4A24;transform:translateY(-1px);box-shadow:var(--sh-md);}
.btn-primary:active{transform:translateY(0);box-shadow:var(--sh-sm);}
.btn-ghost{background:var(--surface);color:var(--brand-700);border-color:var(--brand-700);border-radius:12px;}
.btn-ghost:hover{background:var(--brand-100);}
.btn-light{background:rgba(255,255,255,.14);color:#fff;border-color:rgba(255,255,255,.5);}
.btn-light:hover{background:rgba(255,255,255,.24);}
.btn-sm{padding:10px 18px;font-size:14px;}
.link-more{
  color:var(--brand-700);font-weight:600;font-size:15px;
  text-decoration:underline;text-underline-offset:4px;transition:color .2s;
}
.link-more:hover{color:var(--accent-600);}

/* ============ 页头 ============ */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:60;
  background:rgba(247,243,235,.88);
  border-bottom:1px solid transparent;
  transition:background .2s ease,box-shadow .2s ease,border-color .2s ease;
}
.site-header.is-solid{
  background:var(--surface);
  border-bottom-color:var(--line);
  box-shadow:var(--sh-sm);
}
.nav-wrap{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  height:64px;
}
@media (min-width:768px){.nav-wrap{height:72px;}}
.logo{
  display:inline-flex;align-items:center;gap:10px;
  font-size:17px;font-weight:700;color:var(--text-900);letter-spacing:.01em;
}
.logo-mark{
  width:32px;height:32px;flex:0 0 32px;border-radius:9px;
  background:var(--grad);color:#fff;
  display:inline-flex;align-items:center;justify-content:center;
  font-size:13px;font-weight:700;letter-spacing:.02em;
}
.nav-links{display:none;align-items:center;gap:4px;}
@media (min-width:1024px){.nav-links{display:flex;}}
.nav-links a{
  position:relative;display:inline-block;
  padding:9px 14px;font-size:15px;font-weight:500;color:var(--text-600);
  border-radius:var(--r-pill);transition:color .18s,background .18s;
}
.nav-links a:hover{color:var(--brand-700);background:var(--brand-100);}
.nav-links a.is-active{color:var(--brand-700);font-weight:600;background:var(--brand-100);}
.header-cta{display:none;}
@media (min-width:1024px){.header-cta{display:inline-flex;}}

/* ============ 主内容偏移 ============ */
.page-main{padding-top:64px;}
@media (min-width:768px){.page-main{padding-top:72px;}}

/* ============ 分类 Hero ============ */
.cat-hero{
  background:var(--brand-100);
  border-bottom:1px solid var(--line);
  padding:34px 0 36px;
  overflow:hidden;
}
@media (min-width:768px){.cat-hero{padding:52px 0 56px;}}
.crumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-size:14px;color:var(--text-600);margin-bottom:18px;
}
.crumb a{color:var(--brand-700);}
.crumb a:hover{text-decoration:underline;text-underline-offset:4px;}
.crumb .sep{color:var(--text-400);}
.cat-hero-grid{display:grid;gap:26px;align-items:center;}
@media (min-width:1024px){
  .cat-hero-grid{grid-template-columns:minmax(0,1fr) 320px;gap:44px;}
}
.cat-hero h1{margin-bottom:16px;}
.cat-lead{max-width:64ch;font-size:17px;color:var(--text-600);margin-bottom:20px;}
.cat-tags{display:flex;flex-wrap:wrap;gap:10px;}
.badge{
  display:inline-flex;align-items:center;
  font-size:12px;line-height:1.4;font-weight:600;
  padding:6px 12px;border-radius:var(--r-pill);
  background:var(--surface);color:var(--brand-700);
  border:1px solid rgba(20,85,75,.16);
}
.badge-accent{background:var(--accent-100);color:var(--accent-600);border-color:rgba(212,85,43,.18);}
.cat-hero-figure{
  border-radius:var(--r-lg);overflow:hidden;
  border:1px solid rgba(20,85,75,.12);
  box-shadow:var(--sh-md);background:var(--surface);
}
.cat-hero-figure img{width:100%;height:200px;object-fit:cover;}
@media (min-width:768px){.cat-hero-figure img{height:240px;}}
.cat-hero-figure figcaption{
  font-size:14px;color:var(--text-400);padding:10px 14px;background:var(--surface);
}

/* ============ 锚点条（移动） ============ */
.anchor-bar{
  position:sticky;top:64px;z-index:40;
  background:rgba(247,243,235,.96);
  border-bottom:1px solid var(--line);
  padding:10px 0;
}
@media (min-width:768px){.anchor-bar{top:72px;}}
@media (min-width:1024px){.anchor-bar{display:none;}}
.anchor-bar .scroller{
  display:flex;gap:8px;overflow-x:auto;scroll-snap-type:x proximity;
  -webkit-overflow-scrolling:touch;padding-bottom:2px;
}
.anchor-bar .scroller::-webkit-scrollbar{height:4px;}
.anchor-bar .scroller::-webkit-scrollbar-thumb{background:var(--line);border-radius:99px;}
.anchor-bar a{
  flex:0 0 auto;scroll-snap-align:start;
  font-size:14px;font-weight:500;color:var(--text-600);
  background:var(--surface);border:1px solid var(--line);
  padding:8px 14px;border-radius:var(--r-pill);
}
.anchor-bar a:active{color:var(--brand-700);border-color:var(--brand-500);}

/* ============ 两栏布局 ============ */
.cat-body{padding:40px 0 0;}
@media (min-width:768px){.cat-body{padding:56px 0 0;}}
@media (min-width:1024px){.cat-body{padding:72px 0 0;}}
.cat-layout{display:grid;gap:32px;}
@media (min-width:1024px){
  .cat-layout{grid-template-columns:200px minmax(0,1fr);gap:48px;align-items:start;}
}
.toc{
  display:none;
}
@media (min-width:1024px){
  .toc{display:block;position:sticky;top:104px;}
}
.toc h2{
  font-size:13px;font-weight:600;letter-spacing:.08em;
  color:var(--text-400);text-transform:uppercase;margin-bottom:14px;
}
.toc ol{display:flex;flex-direction:column;gap:2px;}
.toc a{
  display:block;font-size:15px;color:var(--text-600);
  padding:9px 0 9px 14px;border-left:2px solid var(--line);
  transition:color .18s,border-color .18s,background .18s;
}
.toc a:hover{color:var(--brand-700);border-left-color:var(--brand-500);background:linear-gradient(90deg,var(--brand-100),transparent);}
.toc a.is-active{color:var(--brand-700);font-weight:600;border-left-color:var(--brand-700);}

/* ============ 内容区块 ============ */
.content-section{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:var(--r-lg);
  padding:22px 20px 24px;
  box-shadow:var(--sh-sm);
  margin-bottom:24px;
  scroll-margin-top:130px;
}
@media (min-width:768px){.content-section{padding:30px 32px 32px;margin-bottom:28px;}}
@media (min-width:1024px){.content-section{scroll-margin-top:110px;}}
.section-head{display:flex;align-items:flex-start;gap:14px;margin-bottom:16px;}
.section-num{
  flex:0 0 auto;width:38px;height:38px;border-radius:11px;
  background:var(--brand-100);color:var(--brand-700);
  display:inline-flex;align-items:center;justify-content:center;
  font-size:14px;font-weight:700;font-variant-numeric:tabular-nums;
}
.section-head h2{font-size:clamp(21px,2.6vw,26px);}
.section-head .sub{
  display:block;font-size:14px;font-weight:400;color:var(--text-400);margin-top:6px;
}
.section-text{color:var(--text-600);}
.section-text strong{color:var(--text-900);font-weight:600;}

.bullet-list{margin-top:16px;border-top:1px solid var(--line);}
.bullet-list li{
  position:relative;padding:12px 0 12px 22px;
  font-size:16px;line-height:1.75;color:var(--text-600);
  border-bottom:1px solid var(--line);
}
.bullet-list li:last-child{border-bottom:none;}
.bullet-list li::before{
  content:"";position:absolute;left:2px;top:21px;
  width:6px;height:6px;border-radius:1px;background:var(--brand-500);
}
.bullet-list li b{color:var(--text-900);font-weight:600;}

/* 定义式信息行 */
.def-card{
  border:1px solid var(--line);border-radius:var(--r-md);
  background:var(--paper);
  overflow:hidden;margin-top:18px;
}
.def-row{
  display:grid;gap:4px;padding:15px 18px;
  border-bottom:1px solid var(--line);
}
.def-row:last-child{border-bottom:none;}
@media (min-width:768px){
  .def-row{grid-template-columns:150px minmax(0,1fr);gap:20px;align-items:baseline;}
}
.def-row dt{font-weight:600;font-size:16px;color:var(--text-900);}
.def-row dd{margin:0;font-size:16px;line-height:1.75;color:var(--text-600);}

/* 步骤 */
.steps{display:flex;flex-direction:column;gap:0;margin-top:18px;}
.step{
  display:grid;gap:6px;padding:16px 0;
  border-bottom:1px solid var(--line);
}
.step:last-child{border-bottom:none;}
@media (min-width:768px){
  .step{grid-template-columns:78px minmax(0,1fr);gap:20px;}
}
.step-no{
  font-size:13px;font-weight:700;color:var(--accent-600);
  letter-spacing:.06em;padding-top:3px;
}
.step h3{font-size:18px;margin-bottom:6px;}
.step p{font-size:16px;line-height:1.75;color:var(--text-600);margin:0;}

/* 配图 */
.figure{margin:20px 0 0;}
.figure img{width:100%;height:190px;object-fit:cover;border-radius:var(--r-md);}
@media (min-width:768px){.figure img{height:260px;}}
.figure figcaption{font-size:14px;color:var(--text-400);margin-top:10px;}

.note{
  margin-top:18px;background:var(--accent-100);
  border-left:4px solid var(--accent-500);
  border-radius:0 var(--r-md) var(--r-md) 0;
  padding:16px 18px;font-size:16px;line-height:1.75;color:#7A3418;
}
.note b{color:var(--accent-600);}

/* ============ 相关分类 ============ */
.related-wrap{margin-top:12px;}
.related-grid{display:grid;gap:18px;margin-top:20px;}
@media (min-width:640px){.related-grid{grid-template-columns:repeat(2,minmax(0,1fr));}}
@media (min-width:1024px){.related-grid{grid-template-columns:repeat(3,minmax(0,1fr));}}
.rel-card{
  display:flex;flex-direction:column;
  background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-lg);padding:20px;
  box-shadow:var(--sh-sm);
  transition:transform .2s ease-out,border-color .2s ease-out,box-shadow .2s ease-out;
}
.rel-card:hover{transform:translateY(-4px);border-color:var(--brand-500);box-shadow:var(--sh-md);}
.rel-card .badge{align-self:flex-start;background:var(--brand-100);color:var(--brand-700);border-color:transparent;}
.rel-card h3{margin:14px 0 8px;font-size:18px;}
.rel-card p{font-size:15px;line-height:1.7;color:var(--text-600);margin-bottom:16px;}
.rel-card .rel-foot{margin-top:auto;font-size:14px;font-weight:600;color:var(--brand-700);}

/* ============ FAQ ============ */
.faq-section{padding:44px 0;}
@media (min-width:768px){.faq-section{padding:64px 0;}}
.section-title-block{margin-bottom:24px;max-width:720px;}
.section-title-block h2{margin-bottom:10px;}
.section-title-block p{color:var(--text-600);font-size:16px;}
.faq-list{border-top:1px solid var(--line);}
.faq-item{border-bottom:1px solid var(--line);}
.faq-item summary{
  display:flex;align-items:flex-start;justify-content:space-between;gap:16px;
  padding:18px 0;cursor:pointer;list-style:none;
  font-size:17px;font-weight:600;color:var(--text-900);line-height:1.6;
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary .mark{
  flex:0 0 auto;width:22px;height:22px;position:relative;margin-top:2px;
}
.faq-item summary .mark::before,
.faq-item summary .mark::after{
  content:"";position:absolute;background:var(--brand-700);border-radius:2px;
  transition:transform .2s ease,opacity .2s ease;
}
.faq-item summary .mark::before{left:0;top:10px;width:22px;height:2px;}
.faq-item summary .mark::after{left:10px;top:0;width:2px;height:22px;}
.faq-item[open] summary .mark::after{transform:scaleY(0);opacity:0;}
.faq-item[open] summary{color:var(--brand-700);}
.faq-answer{
  background:var(--brand-100);border-left:3px solid var(--brand-700);
  border-radius:0 var(--r-md) var(--r-md) 0;
  padding:16px 18px;margin-bottom:18px;
  font-size:16px;line-height:1.8;color:#20443C;
}

/* ============ 底部 CTA ============ */
.cta-band{background:var(--grad);color:#fff;padding:38px 0;}
@media (min-width:768px){.cta-band{padding:54px 0;}}
.cta-inner{display:grid;gap:22px;align-items:center;}
@media (min-width:768px){.cta-inner{grid-template-columns:minmax(0,1fr) auto;gap:36px;}}
.cta-inner h2{color:#fff;font-size:clamp(22px,2.8vw,28px);margin-bottom:10px;}
.cta-inner p{color:rgba(255,255,255,.78);font-size:16px;margin:0;max-width:56ch;}
.cta-actions{display:flex;flex-wrap:wrap;gap:12px;}

/* ============ 页脚 ============ */
.site-footer{background:var(--ink-900);color:rgba(255,255,255,.72);padding:44px 0 26px;font-size:15px;}
@media (min-width:768px){.site-footer{padding:56px 0 30px;}}
.footer-grid{display:grid;gap:30px;}
@media (min-width:768px){.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:32px;}}
@media (min-width:1024px){.footer-grid{grid-template-columns:1.4fr 1fr 1fr 1fr;gap:36px;}}
.footer-brand .logo{color:#fff;margin-bottom:14px;}
.footer-brand p{color:rgba(255,255,255,.62);font-size:15px;line-height:1.75;margin:0;max-width:38ch;}
.footer-col h4{
  color:#fff;font-size:15px;font-weight:600;margin-bottom:14px;
  letter-spacing:.02em;
}
.footer-col ul{display:flex;flex-direction:column;gap:10px;}
.footer-col a{color:rgba(255,255,255,.72);font-size:15px;transition:color .18s;}
.footer-col a:hover{color:#fff;text-decoration:underline;text-underline-offset:4px;}
.footer-col .muted{color:rgba(255,255,255,.55);font-size:15px;}
.footer-bottom{
  margin-top:34px;padding-top:20px;
  border-top:1px solid rgba(255,255,255,.12);
  display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;
  font-size:14px;color:rgba(255,255,255,.5);
}

/* ============ 移动底部 Tab ============ */
.mobile-tab{
  position:fixed;left:0;right:0;bottom:0;z-index:70;
  display:flex;background:var(--surface);
  border-top:1px solid var(--line);
  height:calc(56px + env(safe-area-inset-bottom));
  padding-bottom:env(safe-area-inset-bottom);
  box-shadow:0 -2px 12px -8px rgba(16,28,26,.28);
}
@media (min-width:768px){.mobile-tab{display:none;}}
.mobile-tab a{
  flex:1 1 0;position:relative;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;
  font-size:11px;color:var(--text-600);line-height:1.2;
}
.mobile-tab a svg{width:22px;height:22px;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;}
.mobile-tab a.is-active{color:var(--brand-700);font-weight:600;}
.mobile-tab a.is-active::before{
  content:"";position:absolute;top:0;left:50%;transform:translateX(-50%);
  width:26px;height:2px;background:var(--brand-700);border-radius:0 0 2px 2px;
}

/* ============ 固定转化条 ============ */
.dock{
  position:fixed;z-index:65;
  left:0;right:0;bottom:calc(56px + env(safe-area-inset-bottom));
  height:52px;background:var(--ink-900);
  border-top:1px solid rgba(255,255,255,.12);
  box-shadow:var(--sh-lg);
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:0 16px;
}
.dock p{margin:0;color:rgba(255,255,255,.8);font-size:14px;}
.dock .dock-actions{display:flex;align-items:center;gap:10px;}
.dock .btn{padding:9px 16px;font-size:14px;}
@media (min-width:768px){
  .dock{
    left:auto;right:24px;bottom:24px;height:auto;
    background:transparent;border-top:none;box-shadow:none;
    padding:0;flex-direction:row;
  }
  .dock p{display:none;}
  .dock .dock-actions{gap:12px;}
  .dock .btn{padding:13px 22px;font-size:15px;box-shadow:var(--sh-md);}
}
.dock-top{
  display:inline-flex;align-items:center;justify-content:center;
  width:44px;height:44px;border-radius:var(--r-pill);
  background:var(--surface);color:var(--brand-700);
  border:1.5px solid var(--brand-700);cursor:pointer;
  transition:background .18s,transform .18s;
}
.dock-top:hover{background:var(--brand-100);transform:translateY(-1px);}
.dock-top svg{width:18px;height:18px;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;}

@media (max-width:519px){
  .btn{width:100%;}
  .cta-actions{flex-direction:column;}
  .dock .btn{width:auto;}
}

/* roulang page: category2 */
:root{
  --ink-900:#0E1C1A;
  --brand-700:#14554B;
  --brand-500:#1E7A68;
  --brand-100:#E3F1EC;
  --accent-600:#D4552B;
  --accent-500:#E8763F;
  --accent-100:#FBE7DC;
  --paper:#F7F3EB;
  --surface:#FFFFFF;
  --line:#E4DDD0;
  --text-900:#1A1D1C;
  --text-600:#55605C;
  --text-400:#8A938F;
  --success:#2E7D5B;
  --warn:#B7791F;
  --danger:#B23A2E;
  --r-sm:10px;
  --r-md:14px;
  --r-lg:18px;
  --r-pill:999px;
  --sh-sm:0 1px 2px rgba(16,28,26,.06);
  --sh-md:0 6px 18px -6px rgba(16,28,26,.14);
  --sh-lg:0 18px 40px -18px rgba(16,28,26,.24);
  --grad:linear-gradient(135deg,var(--brand-700) 0%,var(--ink-900) 100%);
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--paper);
  color:var(--text-900);
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
  font-size:17px;
  line-height:1.8;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;border-radius:var(--r-md);}
a{color:inherit;text-decoration:none;}
a:focus-visible,button:focus-visible{outline:2px solid var(--brand-500);outline-offset:2px;border-radius:6px;}
button{font-family:inherit;}
h1,h2,h3,h4{margin:0;color:var(--text-900);line-height:1.35;}
h1{font-size:clamp(30px,4.6vw,46px);line-height:1.25;font-weight:700;}
h2{font-size:clamp(24px,3.2vw,32px);font-weight:700;}
h3{font-size:20px;font-weight:600;line-height:1.4;}
h4{font-size:17px;font-weight:600;line-height:1.5;}
p{margin:0 0 1em;}
p:last-child{margin-bottom:0;}
ul{margin:0;padding:0;list-style:none;}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px;}
@media(min-width:768px){.container{padding:0 24px;}}

/* ============ 按钮 ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-size:16px;font-weight:600;line-height:1;
  padding:14px 26px;border-radius:var(--r-pill);border:1.5px solid transparent;
  cursor:pointer;transition:transform .2s ease-out,box-shadow .2s ease-out,background-color .2s ease-out,border-color .2s ease-out,color .2s ease-out;
  white-space:nowrap;
}
.btn-primary{background:var(--accent-600);color:#fff;box-shadow:var(--sh-sm);}
.btn-primary:hover{background:#BF4A24;transform:translateY(-1px);box-shadow:var(--sh-md);}
.btn-primary:active{transform:translateY(0);}
.btn-ghost{background:transparent;color:var(--brand-700);border:1.5px solid var(--brand-700);border-radius:12px;}
.btn-ghost:hover{background:var(--brand-100);}
.btn-sm{padding:10px 18px;font-size:15px;}
.link-arrow{color:var(--brand-700);font-weight:600;text-decoration:underline;text-underline-offset:4px;}
.link-arrow:hover{color:var(--brand-500);}

/* ============ 页头 ============ */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:70;
  background:transparent;border-bottom:1px solid transparent;
  transition:background-color .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.site-header.is-solid{background:var(--surface);border-bottom:1px solid var(--line);box-shadow:var(--sh-sm);}
.nav-wrap{display:flex;align-items:center;gap:20px;height:72px;}
.logo{display:inline-flex;align-items:center;gap:10px;font-weight:700;font-size:18px;color:var(--text-900);}
.logo-mark{
  display:inline-flex;align-items:center;justify-content:center;
  width:34px;height:34px;border-radius:10px;
  background:var(--grad);color:#fff;font-size:13px;font-weight:700;letter-spacing:.04em;
}
.nav-links{display:none;align-items:center;gap:6px;margin-left:auto;}
.nav-links a{
  padding:9px 14px;border-radius:10px;font-size:15px;font-weight:500;color:var(--text-600);
  transition:color .2s ease,background-color .2s ease;
}
.nav-links a:hover{color:var(--brand-700);background:var(--brand-100);}
.nav-links a.is-active{color:var(--brand-700);font-weight:600;background:var(--brand-100);}
.header-cta{display:none;margin-left:8px;}
@media(min-width:1024px){
  .nav-links{display:flex;}
  .header-cta{display:inline-flex;}
}

/* ============ 分类页 Hero ============ */
.cat-hero{background:var(--brand-100);padding:104px 0 48px;border-bottom:1px solid var(--line);}
.breadcrumb{display:flex;align-items:center;flex-wrap:wrap;gap:8px;font-size:14px;color:var(--text-400);margin-bottom:18px;}
.breadcrumb a{color:var(--text-600);}
.breadcrumb a:hover{color:var(--brand-700);text-decoration:underline;text-underline-offset:4px;}
.breadcrumb .sep{color:var(--text-400);}
.breadcrumb .current{color:var(--brand-700);font-weight:600;}
.cat-hero-grid{display:grid;gap:28px;}
@media(min-width:900px){.cat-hero-grid{grid-template-columns:1.5fr 1fr;align-items:center;gap:44px;}}
.cat-hero h1{margin:14px 0 16px;}
.cat-hero .lead{font-size:17px;color:var(--text-600);max-width:640px;margin-bottom:0;}
.cat-hero-visual img{width:100%;height:230px;object-fit:cover;border-radius:var(--r-lg);box-shadow:var(--sh-md);}
@media(min-width:900px){.cat-hero-visual img{height:260px;}}
.badge{
  display:inline-flex;align-items:center;gap:6px;
  font-size:12px;font-weight:600;line-height:1.4;
  padding:5px 12px;border-radius:var(--r-pill);
}
.badge-brand{background:var(--surface);color:var(--brand-700);border:1px solid rgba(20,85,75,.16);}
.badge-accent{background:var(--accent-100);color:var(--accent-600);}

/* ============ 主体布局 ============ */
.page-main{padding:48px 0 0;}
@media(min-width:1024px){.page-main{padding:72px 0 0;}}
.cat-layout{display:grid;gap:32px;}
@media(min-width:1024px){.cat-layout{grid-template-columns:196px minmax(0,1fr);gap:52px;align-items:start;}}

.cat-toc{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:16px;box-shadow:var(--sh-sm);
  display:flex;gap:8px;overflow-x:auto;-webkit-overflow-scrolling:touch;
}
.cat-toc::-webkit-scrollbar{height:4px;}
.cat-toc::-webkit-scrollbar-thumb{background:var(--line);border-radius:4px;}
.cat-toc .toc-title{display:none;}
.cat-toc a{
  flex:0 0 auto;font-size:14px;font-weight:500;color:var(--text-600);
  padding:7px 12px;border-radius:var(--r-pill);white-space:nowrap;
  transition:color .2s ease,background-color .2s ease;
}
.cat-toc a:hover{color:var(--brand-700);background:var(--brand-100);}
.cat-toc a.active{color:var(--brand-700);background:var(--brand-100);font-weight:600;}
@media(min-width:1024px){
  .cat-toc{
    position:sticky;top:96px;display:block;overflow:visible;padding:20px 18px;
    border-radius:var(--r-md);
  }
  .cat-toc .toc-title{
    display:block;font-size:13px;font-weight:600;color:var(--text-400);
    letter-spacing:.06em;margin-bottom:12px;padding-left:10px;
  }
  .cat-toc a{
    display:block;font-size:15px;padding:8px 10px;border-radius:8px;
    border-left:3px solid transparent;margin-bottom:2px;white-space:normal;
  }
  .cat-toc a.active{border-left-color:var(--brand-700);border-radius:0 8px 8px 0;}
}

.cat-body > section{margin-bottom:52px;}
.cat-body > section:last-child{margin-bottom:0;}
.cat-body h2{position:relative;padding-left:16px;margin-bottom:18px;}
.cat-body h2::before{
  content:"";position:absolute;left:0;top:.22em;width:4px;height:1em;
  background:var(--brand-700);border-radius:2px;
}
.cat-body h3{margin:26px 0 10px;}
.cat-body p{color:var(--text-600);}
.cat-body .figure{margin:24px 0;border-radius:var(--r-lg);overflow:hidden;background:var(--surface);border:1px solid var(--line);box-shadow:var(--sh-sm);}
.cat-body .figure img{width:100%;height:240px;object-fit:cover;border-radius:0;}
@media(min-width:768px){.cat-body .figure img{height:300px;}}
.cat-body .figure figcaption{padding:12px 18px;font-size:14px;color:var(--text-400);background:var(--surface);}

.point-list{margin:16px 0 0;border-top:1px solid var(--line);}
.point-list li{
  position:relative;padding:11px 0 11px 20px;border-bottom:1px solid var(--line);
  color:var(--text-600);line-height:1.7;
}
.point-list li::before{
  content:"";position:absolute;left:0;top:1.25em;width:6px;height:6px;
  background:var(--brand-500);border-radius:1px;
}
.point-list li strong{color:var(--text-900);font-weight:600;}

.def-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-md);
  padding:0 20px;box-shadow:var(--sh-sm);margin-top:18px;
}
.def-row{display:grid;gap:6px;padding:16px 0;border-bottom:1px solid var(--line);}
.def-row:last-child{border-bottom:0;}
.def-row .term{font-weight:600;color:var(--text-900);font-size:16px;}
.def-row .desc{color:var(--text-600);font-size:16px;line-height:1.75;}
@media(min-width:640px){
  .def-row{grid-template-columns:150px minmax(0,1fr);gap:20px;align-items:start;}
}

.step-list{counter-reset:step;margin-top:18px;}
.step-list li{
  position:relative;padding:14px 0 14px 52px;border-bottom:1px solid var(--line);
  color:var(--text-600);counter-increment:step;
}
.step-list li:last-child{border-bottom:0;}
.step-list li::before{
  content:counter(step,decimal-leading-zero);
  position:absolute;left:0;top:14px;width:34px;height:34px;border-radius:10px;
  display:flex;align-items:center;justify-content:center;
  background:var(--brand-100);color:var(--brand-700);font-size:13px;font-weight:700;
  font-family:Inter,system-ui,sans-serif;
}
.step-list li strong{display:block;color:var(--text-900);font-weight:600;margin-bottom:2px;}

.callout{
  background:var(--accent-100);border-left:4px solid var(--accent-500);
  border-radius:0 var(--r-md) var(--r-md) 0;padding:18px 20px;margin:22px 0;
  color:#6B3418;font-size:16px;line-height:1.8;
}
.callout strong{color:#5A2A12;}

/* ============ 相关分类 ============ */
.related-block{margin-top:64px;padding-top:44px;border-top:1px solid var(--line);}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:22px;flex-wrap:wrap;}
.section-head p{margin:6px 0 0;color:var(--text-600);font-size:16px;}
.card-grid{display:grid;gap:20px;grid-template-columns:1fr;}
@media(min-width:640px){.card-grid{grid-template-columns:repeat(2,1fr);}}
@media(min-width:1024px){.card-grid{grid-template-columns:repeat(3,1fr);gap:24px;}}
.card{
  display:flex;flex-direction:column;background:var(--surface);
  border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden;
  box-shadow:var(--sh-sm);
  transition:border-color .2s ease-out,transform .2s ease-out,box-shadow .2s ease-out;
}
.card:hover{border-color:var(--brand-500);transform:translateY(-4px);box-shadow:var(--sh-md);}
.card img{width:100%;height:172px;object-fit:cover;border-radius:0;}
.card .card-body{padding:20px 22px 22px;display:flex;flex-direction:column;flex:1;}
.card h3{font-size:18px;margin-bottom:8px;}
.card p{font-size:15px;color:var(--text-600);line-height:1.75;margin-bottom:14px;}
.card .card-foot{margin-top:auto;font-size:14px;font-weight:600;color:var(--brand-700);}

/* ============ FAQ ============ */
.faq-block{margin-top:64px;}
.faq-item{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-md);
  overflow:hidden;box-shadow:var(--sh-sm);
}
.faq-item + .faq-item{margin-top:12px;}
.faq-item.is-open{border-color:var(--brand-500);}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:18px 20px;background:none;border:0;cursor:pointer;text-align:left;
  font-size:17px;font-weight:600;color:var(--text-900);line-height:1.5;
}
.faq-q:hover{color:var(--brand-700);}
.faq-icon{position:relative;flex:0 0 auto;width:20px;height:20px;}
.faq-icon::before,.faq-icon::after{content:"";position:absolute;background:var(--brand-700);border-radius:2px;}
.faq-icon::before{left:0;top:9px;width:20px;height:2px;}
.faq-icon::after{left:9px;top:0;width:2px;height:20px;transition:transform .2s ease;}
.faq-item.is-open .faq-icon::after{transform:scaleY(0);}
.faq-a{
  display:none;padding:2px 20px 20px 20px;font-size:16px;line-height:1.8;
  color:var(--text-600);
}
.faq-item.is-open .faq-a{display:block;background:var(--brand-100);border-left:3px solid var(--brand-700);padding-top:16px;}

/* ============ 底部 CTA 通栏 ============ */
.cta-band{
  margin-top:72px;background:var(--grad);border-radius:var(--r-lg);
  padding:32px 26px;display:grid;gap:20px;box-shadow:var(--sh-lg);
}
@media(min-width:768px){
  .cta-band{grid-template-columns:minmax(0,1fr) auto;align-items:center;padding:40px 44px;gap:32px;}
}
.cta-band h2{color:#fff;font-size:clamp(22px,2.6vw,28px);margin-bottom:10px;}
.cta-band p{color:rgba(255,255,255,.78);font-size:16px;margin:0;max-width:640px;}
.cta-band .btn-primary{background:var(--accent-500);}
.cta-band .btn-primary:hover{background:var(--accent-600);}

/* ============ 页脚 ============ */
.site-footer{background:var(--ink-900);color:#fff;margin-top:72px;padding:56px 0 28px;}
.footer-grid{display:grid;gap:32px;}
@media(min-width:768px){.footer-grid{grid-template-columns:1.4fr 1fr 1fr 1fr;gap:28px;}}
.footer-brand .logo{color:#fff;margin-bottom:14px;}
.footer-brand p{color:rgba(255,255,255,.62);font-size:15px;line-height:1.8;max-width:340px;margin:0;}
.footer-col h4{color:#fff;font-size:15px;font-weight:600;margin-bottom:14px;}
.footer-col ul li{margin-bottom:10px;font-size:15px;}
.footer-col ul li a{color:rgba(255,255,255,.66);transition:color .2s ease;}
.footer-col ul li a:hover{color:#fff;text-decoration:underline;text-underline-offset:4px;}
.footer-col .muted{color:rgba(255,255,255,.62);}
.footer-bottom{
  display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;
  margin-top:40px;padding-top:22px;border-top:1px solid rgba(255,255,255,.12);
  font-size:14px;color:rgba(255,255,255,.5);
}

/* ============ 移动端底部 Tab ============ */
.mobile-tabs{
  position:fixed;left:0;right:0;bottom:0;z-index:60;display:none;
  background:var(--surface);border-top:1px solid var(--line);
  height:calc(56px + env(safe-area-inset-bottom));
  padding-bottom:env(safe-area-inset-bottom);
  box-shadow:0 -2px 12px -6px rgba(16,28,26,.16);
}
@media(max-width:1023px){.mobile-tabs{display:flex;}}
.mobile-tabs a{
  flex:1;position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;
  gap:2px;font-size:11px;color:var(--text-600);padding-top:4px;
}
.mobile-tabs a.is-active{color:var(--brand-700);font-weight:600;}
.mobile-tabs a.is-active::before{
  content:"";position:absolute;top:0;left:50%;transform:translateX(-50%);
  width:28px;height:2px;border-radius:2px;background:var(--brand-700);
}
.mobile-tabs svg{width:24px;height:24px;stroke-width:1.8;}

/* ============ 固定转化条 ============ */
.float-bar{
  position:fixed;z-index:61;right:24px;bottom:24px;display:flex;align-items:center;gap:10px;
}
.float-bar .to-top{
  width:44px;height:44px;border-radius:50%;background:var(--surface);color:var(--brand-700);
  border:1px solid var(--line);box-shadow:var(--sh-md);cursor:pointer;
  display:flex;align-items:center;justify-content:center;font-size:18px;line-height:1;
  transition:transform .2s ease-out,box-shadow .2s ease-out,background-color .2s ease-out;
}
.float-bar .to-top:hover{transform:translateY(-2px);box-shadow:var(--sh-lg);background:var(--brand-100);}
@media(max-width:1023px){
  .float-bar{
    left:0;right:0;bottom:calc(56px + env(safe-area-inset-bottom));
    height:52px;background:var(--ink-900);border-top:1px solid rgba(255,255,255,.14);
    border-radius:0;padding:0 16px;gap:12px;box-shadow:var(--sh-lg);
  }
  .float-bar .btn-primary{
    flex:1;height:38px;padding:0 16px;font-size:15px;
    background:var(--accent-500);
  }
  .float-bar .to-top{
    width:36px;height:36px;background:rgba(255,255,255,.12);
    border-color:rgba(255,255,255,.2);color:#fff;box-shadow:none;font-size:16px;
  }
}
body{padding-bottom:calc(108px + env(safe-area-inset-bottom));}
@media(min-width:1024px){body{padding-bottom:0;}}

@media(max-width:520px){
  body{font-size:16px;}
  .cat-hero{padding:92px 0 40px;}
  .card img{height:158px;}
  .cta-band{padding:26px 20px;border-radius:var(--r-md);}
}

/* roulang page: category3 */
:root{
  --ink-900:#0E1C1A;
  --brand-700:#14554B; --brand-500:#1E7A68; --brand-100:#E3F1EC;
  --accent-600:#D4552B; --accent-500:#E8763F; --accent-100:#FBE7DC;
  --paper:#F7F3EB; --surface:#FFFFFF; --line:#E4DDD0;
  --text-900:#1A1D1C; --text-600:#55605C; --text-400:#8A938F;
  --success:#2E7D5B; --warn:#B7791F; --danger:#B23A2E;
  --r-sm:10px; --r-md:14px; --r-lg:18px; --r-pill:999px;
  --sh-sm:0 1px 2px rgba(16,28,26,.06);
  --sh-md:0 6px 18px -6px rgba(16,28,26,.14);
  --sh-lg:0 18px 40px -18px rgba(16,28,26,.24);
  --grad:linear-gradient(135deg,var(--brand-700),var(--ink-900));
  --font-cn:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;background:var(--paper);color:var(--text-900);
  font-family:var(--font-cn);font-size:17px;line-height:1.8;letter-spacing:.01em;
  padding-bottom:calc(108px + env(safe-area-inset-bottom));
}
h1,h2,h3,h4{margin:0;font-weight:700;line-height:1.3;letter-spacing:.01em}
h1{font-size:clamp(30px,4.6vw,46px);line-height:1.25}
h2{font-size:clamp(24px,3.2vw,32px);line-height:1.35}
h3{font-size:20px;line-height:1.4;font-weight:600}
h4{font-size:17px;line-height:1.5;font-weight:600}
p{margin:0 0 1em}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{margin:0;padding:0;list-style:none}
button{font:inherit}
:focus-visible{outline:2px solid var(--brand-500);outline-offset:2px;border-radius:var(--r-sm)}
.container{width:100%;max-width:1200px;margin:0 auto;padding-left:20px;padding-right:20px}
.muted{color:var(--text-400);font-size:14px;line-height:1.6}

/* ---------- 页头 ---------- */
.site-header{
  position:sticky;top:0;z-index:70;
  background:rgba(255,255,255,.86);backdrop-filter:saturate(140%) blur(6px);
  border-bottom:1px solid transparent;transition:background .2s ease,box-shadow .2s ease,border-color .2s ease;
}
.site-header.is-solid{background:var(--surface);border-bottom-color:var(--line);box-shadow:var(--sh-sm)}
.nav-wrap{display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:68px}
.logo{display:inline-flex;align-items:center;gap:10px;font-weight:700;font-size:17px;color:var(--ink-900)}
.logo-mark{
  width:34px;height:34px;border-radius:10px;display:grid;place-items:center;
  background:var(--grad);color:#fff;font-size:13px;font-weight:700;letter-spacing:.04em;
}
.nav-links{display:flex;align-items:center;gap:4px}
.nav-links a{
  position:relative;padding:9px 13px;border-radius:var(--r-sm);
  font-size:15px;color:var(--text-600);transition:color .18s ease,background .18s ease;
}
.nav-links a:hover{color:var(--brand-700);background:var(--brand-100)}
.nav-links a.is-active{color:var(--brand-700);font-weight:600;background:var(--brand-100)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border-radius:var(--r-pill);border:1.5px solid transparent;
  font-size:16px;font-weight:600;padding:12px 26px;cursor:pointer;
  transition:transform .18s ease,box-shadow .18s ease,background .18s ease,color .18s ease,border-color .18s ease;
}
.btn-sm{padding:9px 18px;font-size:15px}
.btn-primary{background:var(--accent-600);color:#fff;box-shadow:var(--sh-sm)}
.btn-primary:hover{background:#BF4A24;transform:translateY(-1px);box-shadow:var(--sh-md)}
.btn-primary:active{transform:translateY(0);box-shadow:var(--sh-sm)}
.btn-ghost{background:#fff;color:var(--brand-700);border-color:var(--brand-700)}
.btn-ghost:hover{background:var(--brand-100)}
.btn-text{color:var(--brand-700);font-weight:600;text-decoration:underline;text-underline-offset:4px;padding:0}
.btn-text:hover{color:var(--brand-500)}

/* ---------- 徽章 / 标签 ---------- */
.badge{
  display:inline-flex;align-items:center;gap:6px;
  font-size:12px;font-weight:600;line-height:1.4;
  padding:5px 12px;border-radius:var(--r-pill);
  background:var(--brand-100);color:var(--brand-700);white-space:nowrap;
}
.badge-accent{background:var(--accent-100);color:var(--accent-600)}
.badge-line{background:#fff;border:1px solid var(--line);color:var(--text-600)}

/* ---------- 分类 Hero ---------- */
.cat-hero{background:var(--brand-100);border-bottom:1px solid var(--line);overflow:hidden}
.cat-hero-inner{
  display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:40px;align-items:center;
  padding-top:52px;padding-bottom:52px;
}
.crumb{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:14px;color:var(--text-600);margin-bottom:16px}
.crumb a{color:var(--brand-700)}
.crumb a:hover{text-decoration:underline;text-underline-offset:4px}
.crumb .sep{color:var(--text-400)}
.cat-hero h1{margin-bottom:14px}
.cat-lead{max-width:640px;color:var(--text-600);font-size:17px;margin-bottom:20px}
.hero-tags{display:flex;flex-wrap:wrap;gap:8px}
.hero-figure{
  position:relative;border-radius:var(--r-lg);overflow:hidden;box-shadow:var(--sh-md);
  border:1px solid rgba(20,85,75,.12);background:#fff;
}
.hero-figure img{width:100%;height:220px;object-fit:cover}
.hero-figure figcaption{font-size:14px;color:var(--text-400);padding:10px 14px;background:#fff}

/* ---------- 主体两栏 ---------- */
.cat-main{padding-top:64px;padding-bottom:24px}
.cat-layout{display:grid;grid-template-columns:200px minmax(0,1fr);gap:44px;align-items:start}
.toc{position:sticky;top:92px}
.toc h4{font-size:14px;color:var(--text-400);font-weight:600;margin-bottom:12px;letter-spacing:.06em}
.toc a{
  display:block;padding:8px 12px;border-left:2px solid var(--line);
  font-size:15px;color:var(--text-600);line-height:1.5;
  transition:color .18s ease,border-color .18s ease,background .18s ease;
}
.toc a:hover{color:var(--brand-700);background:var(--brand-100)}
.toc a.is-active{color:var(--brand-700);border-left-color:var(--brand-700);font-weight:600;background:var(--brand-100)}
.toc-mobile{display:none}

.section-block{margin-bottom:56px;scroll-margin-top:96px}
.section-block > h2{
  position:relative;padding-left:16px;margin-bottom:18px;
}
.section-block > h2::before{
  content:"";position:absolute;left:0;top:.18em;bottom:.18em;width:4px;
  border-radius:2px;background:var(--brand-700);
}
.section-block p{color:var(--text-600)}
.section-block p.strong{color:var(--text-900)}

/* 提示色块 */
.notice{
  background:var(--accent-100);border-radius:var(--r-lg);padding:22px 24px;
  border:1px solid rgba(212,85,43,.16);margin-bottom:22px;
}
.notice h3{margin-bottom:10px;color:var(--accent-600)}
.notice p{margin-bottom:0;color:#7a4429}

/* 定义式信息行 */
.def-list{display:grid;gap:12px;margin:20px 0 8px}
.def-row{
  display:grid;grid-template-columns:180px minmax(0,1fr);gap:18px;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-md);
  padding:18px 22px;box-shadow:var(--sh-sm);transition:border-color .2s ease,box-shadow .2s ease,transform .2s ease;
}
.def-row:hover{border-color:var(--brand-500);box-shadow:var(--sh-md);transform:translateY(-2px)}
.def-term{font-weight:600;color:var(--ink-900)}
.def-desc{color:var(--text-600);font-size:16px}

/* 步骤 */
.steps{display:grid;gap:14px;margin:20px 0 8px}
.step{
  display:grid;grid-template-columns:44px minmax(0,1fr);gap:16px;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:20px 22px;box-shadow:var(--sh-sm);
  transition:border-color .2s ease,box-shadow .2s ease,transform .2s ease;
}
.step:hover{border-color:var(--brand-500);box-shadow:var(--sh-md);transform:translateY(-3px)}
.step-num{
  width:44px;height:44px;border-radius:12px;display:grid;place-items:center;
  background:var(--brand-100);color:var(--brand-700);font-weight:700;font-size:16px;
}
.step h3{margin-bottom:6px}
.step p{margin-bottom:0;font-size:16px}

/* 列表 */
.dot-list{display:grid;gap:12px;margin:18px 0 8px}
.dot-list li{
  position:relative;padding-left:20px;color:var(--text-600);
  padding-bottom:12px;border-bottom:1px solid var(--line);line-height:1.7;
}
.dot-list li:last-child{border-bottom:none;padding-bottom:0}
.dot-list li::before{
  content:"";position:absolute;left:0;top:.62em;width:6px;height:6px;
  background:var(--brand-500);border-radius:1.5px;
}
.dot-list strong{color:var(--ink-900);font-weight:600}

/* 图文块 */
.figure-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  overflow:hidden;box-shadow:var(--sh-sm);margin:22px 0 8px;
}
.figure-card img{width:100%;height:280px;object-fit:cover}
.figure-card figcaption{padding:12px 20px;font-size:14px;color:var(--text-400)}

/* 相关分类卡 */
.related-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin-top:22px}
.rel-card{
  display:flex;flex-direction:column;gap:10px;height:100%;
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:22px;box-shadow:var(--sh-sm);
  transition:border-color .2s ease,box-shadow .2s ease,transform .2s ease;
}
.rel-card:hover{border-color:var(--brand-500);box-shadow:var(--sh-md);transform:translateY(-4px)}
.rel-card h3{font-size:18px}
.rel-card p{margin:0;font-size:15px;color:var(--text-600)}
.rel-card .rel-link{margin-top:auto;color:var(--brand-700);font-weight:600;font-size:15px}
.rel-card .rel-link:hover{text-decoration:underline;text-underline-offset:4px}

/* FAQ */
.faq-wrap{margin-top:22px;border-top:1px solid var(--line)}
.faq-item{border-bottom:1px solid var(--line)}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  background:none;border:none;text-align:left;cursor:pointer;
  padding:20px 4px;font-size:17px;font-weight:600;color:var(--text-900);
  transition:color .18s ease;
}
.faq-q:hover{color:var(--brand-700)}
.faq-icon{
  flex:0 0 auto;width:22px;height:22px;display:grid;place-items:center;
  color:var(--brand-700);font-size:20px;line-height:1;font-weight:400;
}
.faq-a{
  max-height:0;overflow:hidden;transition:max-height .26s ease;
  background:var(--brand-100);border-left:3px solid var(--brand-700);border-radius:0 var(--r-md) var(--r-md) 0;
}
.faq-a p{margin:0;padding:16px 20px;font-size:16px;line-height:1.8;color:var(--text-600)}
.faq-item.is-open .faq-a{max-height:320px}
.faq-item.is-open .faq-q{color:var(--brand-700)}

/* CTA 通栏 */
.cta-band{
  background:var(--grad);border-radius:var(--r-lg);color:#fff;
  padding:34px 32px;display:flex;align-items:center;justify-content:space-between;gap:24px;
  box-shadow:var(--sh-lg);margin:56px 0 0;
}
.cta-band h2{font-size:clamp(22px,2.6vw,28px);color:#fff;margin-bottom:8px}
.cta-band p{margin:0;color:rgba(255,255,255,.78);font-size:16px;max-width:620px}

/* 页脚 */
.site-footer{background:var(--ink-900);color:rgba(255,255,255,.8);margin-top:72px;padding-top:56px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px}
.site-footer .logo{color:#fff;font-size:17px}
.footer-brand p{margin:16px 0 0;font-size:15px;line-height:1.8;color:rgba(255,255,255,.66)}
.footer-col h4{color:#fff;font-size:16px;margin-bottom:14px}
.footer-col ul{display:grid;gap:10px}
.footer-col a{color:rgba(255,255,255,.72);font-size:15px;transition:color .18s ease}
.footer-col a:hover{color:#fff;text-decoration:underline;text-underline-offset:4px}
.footer-col .muted{color:rgba(255,255,255,.56)}
.footer-bottom{
  margin-top:44px;padding:20px 0;border-top:1px solid rgba(255,255,255,.12);
  display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;
  font-size:14px;color:rgba(255,255,255,.56);
}

/* 移动底部 Tab */
.mobile-tab{
  display:none;position:fixed;left:0;right:0;bottom:0;z-index:80;
  height:calc(56px + env(safe-area-inset-bottom));
  padding-bottom:env(safe-area-inset-bottom);
  background:var(--surface);border-top:1px solid var(--line);box-shadow:var(--sh-lg);
}
.mobile-tab-inner{display:grid;grid-template-columns:repeat(4,1fr);height:56px}
.tab-item{
  position:relative;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;
  font-size:11px;color:var(--text-600);line-height:1.2;
}
.tab-item svg{width:22px;height:22px;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.tab-item.is-active{color:var(--brand-700);font-weight:600}
.tab-item.is-active::before{
  content:"";position:absolute;top:0;left:22%;right:22%;height:2px;
  background:var(--brand-700);border-radius:0 0 2px 2px;
}

/* 固定转化条 */
.convert-bar{position:fixed;right:24px;bottom:24px;z-index:75;display:flex;gap:10px;align-items:center}
.convert-bar .btn{box-shadow:var(--sh-md)}
.back-top{
  width:44px;height:44px;border-radius:var(--r-pill);display:grid;place-items:center;
  background:var(--surface);border:1px solid var(--line);color:var(--brand-700);
  box-shadow:var(--sh-md);cursor:pointer;transition:background .18s ease,transform .18s ease;
}
.back-top:hover{background:var(--brand-100);transform:translateY(-1px)}
.back-top svg{width:20px;height:20px;stroke:currentColor;fill:none;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}

/* 响应式 */
@media (max-width:1023px){
  .cat-hero-inner{grid-template-columns:1fr;gap:24px;padding-top:40px;padding-bottom:40px}
  .hero-figure{max-width:520px}
  .cat-layout{grid-template-columns:1fr;gap:24px}
  .toc{display:none}
  .toc-mobile{
    display:flex;gap:8px;overflow-x:auto;padding:4px 0 12px;
    scroll-snap-type:x mandatory;-webkit-overflow-scrolling:touch;
  }
  .toc-mobile a{
    flex:0 0 auto;scroll-snap-align:start;
    padding:8px 14px;border-radius:var(--r-pill);border:1px solid var(--line);
    background:#fff;font-size:14px;color:var(--text-600);
  }
  .toc-mobile a.is-active{background:var(--brand-100);color:var(--brand-700);border-color:var(--brand-500);font-weight:600}
  .related-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
  .cta-band{flex-direction:column;align-items:flex-start}
}
@media (max-width:767px){
  body{padding-bottom:calc(120px + env(safe-area-inset-bottom))}
  .nav-links,.header-cta{display:none}
  .mobile-tab{display:block}
  .cat-main{padding-top:44px}
  .section-block{margin-bottom:44px}
  .def-row{grid-template-columns:1fr;gap:6px}
  .step{grid-template-columns:36px minmax(0,1fr);gap:14px;padding:18px}
  .step-num{width:36px;height:36px;border-radius:10px;font-size:15px}
  .related-grid{grid-template-columns:1fr}
  .figure-card img{height:200px}
  .cta-band{padding:26px 22px}
  .convert-bar{
    left:0;right:0;bottom:calc(56px + env(safe-area-inset-bottom));
    height:52px;padding:0 16px;gap:12px;
    background:var(--ink-900);border-top:1px solid rgba(255,255,255,.1);
    box-shadow:var(--sh-lg);border-radius:0;
    align-items:center;justify-content:space-between;
  }
  .convert-bar .btn{flex:1 1 auto;padding:9px 18px;font-size:15px}
  .convert-bar .back-top{background:rgba(255,255,255,.1);border-color:rgba(255,255,255,.18);color:#fff;width:40px;height:40px}
  .footer-grid{grid-template-columns:1fr;gap:26px}
  .footer-bottom{flex-direction:column;gap:6px}
}
@media (max-width:519px){
  .hero-figure img{height:180px}
  .cat-hero h1{font-size:28px}
  .btn{padding:11px 20px;font-size:15px}
}