:root{color-scheme:light;--page:#f6f6f4;--ink:#1d1d1f;--muted:#70706c;--line:#e1e1dd;--panel:#fff;--dark:#171717}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:32px}
body{margin:0;background:var(--page);color:var(--ink);font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
button{font:inherit}
a,button{touch-action:manipulation}
button:not(:disabled),a{cursor:pointer}
a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:2px solid #52524e;outline-offset:4px}
.wrap{width:min(1160px,calc(100% - 96px));margin-inline:auto}
.serif{font-family:"Songti SC","Noto Serif CJK SC",SimSun,serif;font-weight:500}

/* ---------- Header / footer（与主站一致） ---------- */
.site-header{height:80px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}
.brand{display:inline-flex;align-items:center;gap:10px;white-space:nowrap;font-size:18px;font-weight:650}
.brand b{font-size:17px;font-weight:500;margin-left:4px}
.site-header nav{display:flex;align-items:center;gap:30px;font-size:13px}
.site-header nav>a:not(.button):hover,.text-link:hover,.card-link:hover,.doc-toc a:hover,footer a:hover{text-decoration:underline;text-underline-offset:5px}
.button{display:inline-flex;align-items:center;justify-content:center;gap:18px;border:1px solid var(--dark);background:var(--dark);color:#fff;border-radius:6px;padding:12px 16px;font-size:13px;font-weight:550;line-height:1.2;transition:background .15s,transform .15s}
.button:hover{background:#383834;transform:translateY(-1px)}
.site-footer{border-top:1px solid var(--line);padding-block:28px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.site-footer .brand{font-size:13px}
.site-footer .brand b{font-size:12px}
.footer-message{font-size:11px;color:var(--muted)}
.site-footer>div{display:flex;gap:20px;font-size:10px;color:var(--muted)}
.skip-link{position:fixed;top:8px;left:12px;z-index:30;padding:10px;background:var(--dark);color:#fff;transform:translateY(-200%);border-radius:6px}
.skip-link:focus{transform:translateY(0)}

/* ---------- Hero 与搜索 ---------- */
.help-hero{padding-block:52px 8px;max-width:760px}
.eyebrow{display:flex;gap:10px;align-items:center;font-size:11px;letter-spacing:1.6px;font-weight:600;color:var(--muted);margin:0 0 25px}
.small-line{width:20px;height:1px;background:var(--ink)}
h1{font-size:clamp(40px,4.4vw,58px);font-weight:600;line-height:1.27;letter-spacing:-2.5px;margin:0 0 22px}
.hero-description{color:#666661;font-size:15px;line-height:1.95;margin:0 0 30px}
.search-panel{margin-bottom:10px}
.search-box{display:flex;align-items:center;gap:12px;background:var(--panel);border:1px solid #d6d6d0;border-radius:6px;padding:0 14px;height:54px;box-shadow:0 8px 24px #1d1d1f06;transition:border-color .15s,box-shadow .15s}
.search-box:focus-within{border-color:#8b8b82;box-shadow:0 10px 28px #1d1d1f0a}
.search-box svg{width:18px;height:18px;flex-shrink:0;stroke:var(--muted);stroke-width:1.6;fill:none;stroke-linecap:round}
.search-box input{flex:1;min-width:0;border:0;background:none;font:inherit;font-size:14px;color:var(--ink);height:100%}
.search-box input::placeholder{color:#a3a39b}
.search-box input:focus{outline:none}
.search-box input::-webkit-search-cancel-button{display:none}
.search-clear{border:0;background:#f1f1ed;color:#70706c;width:22px;height:22px;border-radius:50%;font-size:13px;line-height:1;flex-shrink:0}
.search-clear:hover{background:#e7e7e2;color:var(--ink)}
.search-summary{font-size:12px;color:var(--muted);margin:12px 2px 0}
.search-summary b{color:var(--ink);font-weight:600}
.search-summary button{border:0;background:none;color:var(--ink);font-size:12px;padding:0;margin-left:14px;text-decoration:underline;text-underline-offset:4px}
.chip-nav{display:none;gap:8px;flex-wrap:wrap;margin:18px 0 0;padding-bottom:4px}
.chip-nav a{font-size:12px;color:var(--muted);background:var(--panel);border:1px solid var(--line);border-radius:999px;padding:7px 14px;white-space:nowrap;transition:color .15s,border-color .15s}
.chip-nav a:hover{color:var(--ink);border-color:#8b8b82}
.chip-nav a.active{background:var(--dark);border-color:var(--dark);color:#fff}

/* ---------- 文档布局 ---------- */
.doc-layout{display:grid;grid-template-columns:212px minmax(0,1fr);gap:64px;padding-block:44px 40px;align-items:start}
.doc-main{min-width:0}
.doc-sidebar{position:sticky;top:28px;display:flex;flex-direction:column;gap:22px;max-height:calc(100vh - 56px);overflow-y:auto;padding-bottom:8px}
.sidebar-caption{margin:0 0 10px;color:#a1a19b;font-size:9px;font-weight:700;letter-spacing:.19em}
.doc-toc{display:flex;flex-direction:column;gap:2px}
.doc-toc a{display:block;padding:6px 12px;border-radius:6px;color:var(--muted);font-size:12.5px;line-height:1.5;border-left:2px solid transparent}
.doc-toc a:hover{color:var(--ink);background:#efefec}
.doc-toc a.active{color:var(--ink);background:#f0f0ee;font-weight:600}
.doc-toc a.sub{padding-left:24px;font-size:11.5px;color:#8c8c85}
.sidebar-card{border:1px solid var(--line);background:var(--panel);border-radius:6px;padding:16px 16px 18px}
.sidebar-card b{font-size:12.5px;font-weight:600;display:block;margin-bottom:8px}
.sidebar-card p{font-size:11.5px;line-height:1.8;color:var(--muted);margin:0 0 12px}
.text-link{font-size:12px;display:inline-flex;gap:8px;align-items:center;color:#454540}
.card-link{font-size:12px;display:inline-flex;gap:8px;align-items:center;color:#454540}

/* ---------- 通用 section ---------- */
.doc-section{padding-block:38px;border-top:1px solid var(--line)}
.doc-section:first-child{border-top:0;padding-top:0}
.feature-number{color:#85857d;letter-spacing:1.2px;font-size:10px;margin:0 0 14px}
h2{font-size:28px;line-height:1.45;font-weight:550;letter-spacing:-.6px;margin:0 0 12px}
.section-lead{font-size:14px;line-height:1.9;color:var(--muted);margin:0 0 34px;max-width:640px}
mark{background:#f0ede0;color:inherit;padding:0 1px;border-radius:2px}
.no-match{display:none!important}

/* ---------- 认识脉高 ---------- */
.panorama-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.panorama-grid article{background:var(--panel);border:1px solid #dcdcd6;border-radius:6px;padding:22px 24px;transition:border-color .15s}
.panorama-grid article:hover{border-color:#a8a89e}
.panorama-main{grid-column:1/-1;display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:18px 40px}
.panorama-main .feature-number{margin-bottom:10px}
.panorama-main h3{grid-column:1;margin:0;font-size:20px;font-weight:550}
.panorama-main p{grid-column:1;margin:0;font-size:13px;line-height:1.9;color:var(--muted)}
.panorama-main .card-actions{grid-column:1;display:flex;align-items:center;gap:18px;flex-wrap:wrap}
.card-note{font-size:10.5px;color:#a3a39b}
.panorama-grid h3{font-size:15.5px;font-weight:600;margin:0 0 9px}
.panorama-grid p{font-size:12.5px;line-height:1.85;color:var(--muted);margin:0 0 14px}
.card-actions{display:flex;align-items:center;gap:18px;flex-wrap:wrap}

/* ---------- 快速上手 ---------- */
.steps{list-style:none;margin:0;padding:0;display:flex;flex-direction:column}
.steps li{position:relative;display:flex;gap:18px;padding:0 0 30px 2px}
.steps li:not(:last-child):before{content:"";position:absolute;left:17px;top:40px;bottom:6px;width:1px;background:#e3e3dc}
.step-no{position:relative;z-index:1;flex-shrink:0;width:35px;height:35px;border:1px solid #d8d8d1;border-radius:50%;background:var(--panel);display:flex;align-items:center;justify-content:center;font-size:12px;color:#51514b;font-variant-numeric:tabular-nums}
.steps h3{font-size:15px;font-weight:600;margin:7px 0 8px}
.steps p{font-size:13px;line-height:1.9;color:var(--muted);margin:0 0 8px;max-width:600px}
.steps strong{color:var(--ink);font-weight:600}

/* ---------- 功能中心 ---------- */
.feature-group{padding-block:26px 8px}
.feature-group+.feature-group{margin-top:18px}
.group-head{display:flex;align-items:baseline;gap:16px;flex-wrap:wrap;margin-bottom:20px;padding-bottom:14px;border-bottom:1px solid var(--line)}
.group-head h3{font-size:17px;font-weight:600;margin:0}
.group-head p{font-size:12px;color:var(--muted);margin:0}
.group-head p a{color:#454540}
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.card-grid article{background:var(--panel);border:1px solid #dcdcd6;border-radius:6px;padding:18px 19px 16px;display:flex;flex-direction:column;gap:9px;transition:border-color .15s,transform .15s}
.card-grid article:hover{border-color:#a8a89e;transform:translateY(-1px)}
.card-icon{width:34px;height:34px;border-radius:6px;background:#f1f1ed;display:flex;align-items:center;justify-content:center;margin-bottom:3px}
.card-icon svg{width:18px;height:18px;stroke:#3a3a35;stroke-width:1.5;fill:none;stroke-linecap:round;stroke-linejoin:round}
.card-grid h4{font-size:14px;font-weight:600;margin:0}
.card-grid p{font-size:12px;line-height:1.85;color:var(--muted);margin:0;flex:1}
.card-grid p code,.term dd code,.rule-list code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:11px;background:#f1f1ed;border:1px solid #e7e7e1;border-radius:4px;padding:1px 5px}
.card-tag{font-size:10.5px;color:#85857d;margin-top:2px}
.code-line{display:block;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:11.5px;background:#f1f1ed;border:1px solid #e7e7e1;border-radius:4px;padding:7px 10px;color:#454540;width:fit-content;max-width:100%;overflow-x:auto}

/* ---------- 概念词典 ---------- */
.term-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.term{background:var(--panel);border:1px solid #dcdcd6;border-radius:6px;padding:18px 20px;scroll-margin-top:32px}
.term dt{font-size:14.5px;font-weight:600;display:flex;align-items:baseline;gap:9px;flex-wrap:wrap}
.term dt span{font-size:10px;color:#a3a39b;letter-spacing:.4px;font-weight:500}
.term dd{font-size:12.5px;line-height:1.9;color:var(--muted);margin:9px 0 0}
.term dd strong{color:var(--ink);font-weight:600}
.term-related{font-size:11px;color:#8c8c85;margin:11px 0 0}
.term-related a{color:#51514b;border-bottom:1px solid #d8d8d1;padding-bottom:1px}
.term-related a:hover{border-color:#51514b}

/* ---------- 额度与计费 ---------- */
.billing-flow{display:flex;align-items:stretch;gap:0;background:var(--panel);border:1px solid #dcdcd6;border-radius:6px;padding:24px 22px;flex-wrap:wrap}
.flow-node{flex:1;min-width:150px;border:1px solid var(--line);border-radius:6px;background:#fafaf8;padding:15px 16px;display:flex;flex-direction:column;gap:5px}
.flow-tag{font-size:9px;letter-spacing:1.4px;font-weight:600;color:#85857d}
.flow-node b{font-size:15px;font-weight:600}
.flow-node small{font-size:11px;line-height:1.7;color:var(--muted)}
.flow-arrow{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;padding:0 14px;min-width:76px}
.flow-arrow span{font-size:16px;color:#8c8c85}
.flow-arrow i{font-style:normal;font-size:9.5px;color:#a3a39b;white-space:nowrap}
.flow-note{font-size:12px;color:var(--muted);margin:14px 2px 0}
.billing-block{margin-top:36px}
.billing-block h3{font-size:16px;font-weight:600;margin:0 0 14px}
.table-scroll{overflow-x:auto;border:1px solid #dcdcd6;border-radius:6px;background:var(--panel)}
table{width:100%;border-collapse:collapse;font-size:12.5px;min-width:520px}
th{text-align:left;font-size:10px;letter-spacing:.8px;color:#85857d;font-weight:600;padding:12px 16px;border-bottom:1px solid var(--line);background:#fafaf8;white-space:nowrap}
td{padding:12px 16px;border-bottom:1px solid #eaeae7;vertical-align:top;line-height:1.7}
tbody tr:last-child td{border-bottom:0}
td:first-child{font-weight:550;white-space:nowrap}
.pill{display:inline-block;font-size:9px;font-weight:600;letter-spacing:.5px;color:#454540;background:#f1f1ed;border-radius:999px;padding:2px 8px;margin-left:6px;vertical-align:1px}
.table-note{font-size:11.5px;line-height:1.8;color:var(--muted);margin:11px 2px 0}
.rule-list{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.rule-list li{background:var(--panel);border:1px solid #dcdcd6;border-radius:6px;padding:14px 17px;display:flex;flex-direction:column;gap:5px}
.rule-list b{font-size:13px;font-weight:600}
.rule-list span{font-size:12px;line-height:1.85;color:var(--muted)}

/* ---------- 常见问题 ---------- */
.faq-group{padding-block:10px}
.faq-group h3{font-size:15px;font-weight:600;margin:22px 0 10px}
.faq-group details{background:var(--panel);border:1px solid #dcdcd6;border-radius:6px;margin-bottom:8px;overflow:hidden}
.faq-group details[open]{border-color:#a8a89e}
.faq-group summary{list-style:none;display:flex;align-items:center;justify-content:space-between;gap:14px;padding:14px 17px;font-size:13.5px;font-weight:550;cursor:pointer}
.faq-group summary::-webkit-details-marker{display:none}
.faq-group summary:after{content:"+";flex-shrink:0;width:22px;height:22px;border-radius:50%;background:#f1f1ed;display:flex;align-items:center;justify-content:center;font-size:13px;color:#51514b;font-weight:500;transition:transform .18s,background .18s}
.faq-group details[open] summary:after{content:"−";background:var(--dark);color:#fff}
.faq-group details p{font-size:12.5px;line-height:1.95;color:var(--muted);margin:0;padding:0 17px 16px;max-width:680px}
.empty-state{border:1px dashed #c9c9c0;border-radius:6px;padding:30px 24px;text-align:center;margin-top:26px}
.empty-state b{font-size:14px;font-weight:600;display:block;margin-bottom:8px}
.empty-state p{font-size:12.5px;color:var(--muted);margin:0;line-height:1.9}
.empty-state a{color:#454540;text-decoration:underline;text-underline-offset:4px}

/* ---------- 更多入口 ---------- */
.more-strip{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:38px;padding-top:34px;border-top:1px solid var(--line)}
.more-card{background:var(--panel);border:1px solid #dcdcd6;border-radius:6px;padding:18px 20px;display:flex;flex-direction:column;gap:6px;transition:border-color .15s,transform .15s}
.more-card:hover{border-color:#8b8b82;transform:translateY(-1px)}
.more-card b{font-size:14px;font-weight:600}
.more-card span{font-size:11.5px;line-height:1.7;color:var(--muted)}

/* ---------- 回到顶部 ---------- */
.back-top{position:fixed;right:26px;bottom:26px;z-index:20;width:40px;height:40px;border-radius:50%;border:1px solid var(--dark);background:var(--dark);color:#fff;font-size:14px;box-shadow:0 10px 24px #1d1d1f22;transition:background .15s,transform .15s}
.back-top:hover{background:#383834;transform:translateY(-2px)}

/* ---------- 响应式 ---------- */
@media(max-width:1050px){
  .wrap{width:calc(100% - 64px)}
  .doc-layout{grid-template-columns:minmax(0,1fr);gap:8px}
  .doc-sidebar{display:none}
  .chip-nav{display:flex;overflow-x:auto;flex-wrap:nowrap;padding-bottom:10px;scrollbar-width:none}
  .chip-nav::-webkit-scrollbar{display:none}
  .card-grid{grid-template-columns:repeat(2,1fr)}
  .panorama-main{grid-template-columns:1fr}
  .panorama-main h3,.panorama-main p,.panorama-main .card-actions{grid-column:1}
}
@media(max-width:760px){
  .wrap{width:calc(100% - 40px)}
  .site-header{height:72px}
  .site-header nav{gap:16px}
  .site-header nav>a:first-child{display:none}
  .site-header nav>a:nth-child(2){display:none}
  .brand{font-size:15px;gap:7px}
  .brand img{width:27px;height:27px}
  .button.small{font-size:11px;padding:10px;gap:10px}
  .help-hero{padding-top:40px}
  .hero-description{font-size:14px}
  h1{font-size:44px}
  .desktop-break{display:none}
  .search-box{height:50px}
  .doc-layout{padding-block:30px 30px}
  h2{font-size:24px}
  .section-lead{margin-bottom:26px}
  .card-grid,.term-grid,.panorama-grid,.more-strip{grid-template-columns:1fr}
  .billing-flow{flex-direction:column;gap:8px}
  .flow-arrow{flex-direction:row;padding:4px 2px;gap:8px;justify-content:flex-start}
  .flow-arrow span{font-size:14px}
  .steps li{gap:14px}
  .step-no{width:31px;height:31px;font-size:11px}
  .back-top{right:16px;bottom:16px}
  .site-footer{flex-wrap:wrap;gap:16px}
  .footer-message{margin-left:auto}
  .site-footer>div{width:100%;justify-content:flex-end;font-size:11px}
}
@media(max-width:380px){
  .wrap{width:calc(100% - 32px)}
  h1{font-size:40px}
  .card-grid article{padding:16px}
}