:root{
  --brand:#1f5fa8;
  --brand-dark:#164a86;
  --brand-light:#eaf2fb;
  --accent:#c95f1e;
  --accent-light:#fdf1e8;
  --ink:#23303f;
  --ink-2:#5a6b7d;
  --ink-3:#8496a8;
  --line:#dfe7ef;
  --bg:#f5f8fb;
  --card:#ffffff;
  --ok:#1c7a52;
  --ok-bg:#e9f6f0;
  --warn:#a86412;
  --warn-bg:#fdf4e3;
  --radius:10px;
  --sidebar:264px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:"Microsoft YaHei","PingFang SC","Hiragino Sans GB","Source Han Sans SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:15px;
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.page{display:flex;align-items:flex-start;min-height:100vh}

/* ---------- 侧边目录 ---------- */
.side{
  position:sticky;top:0;flex:0 0 var(--sidebar);width:var(--sidebar);
  height:100vh;overflow-y:auto;
  background:#fff;border-right:1px solid var(--line);
  padding:26px 18px 40px;
}
.side-brand{display:flex;align-items:center;gap:10px;padding:0 8px 18px;border-bottom:1px solid var(--line);margin-bottom:18px}
.side-mark{width:34px;height:34px;border-radius:9px;background:linear-gradient(135deg,#2b6cb8,#1f5fa8);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:15px;letter-spacing:1px;flex:none}
.side-brand b{display:block;font-size:15px;line-height:1.4}
.side-brand span{display:block;font-size:12px;color:var(--ink-3);line-height:1.4}
.side h4{font-size:12px;color:var(--ink-3);font-weight:600;letter-spacing:.08em;margin:18px 8px 8px}
.side a.nav-item{display:block;padding:6px 10px;border-radius:7px;color:var(--ink-2);font-size:13.5px;line-height:1.6;border-left:2px solid transparent}
.side a.nav-item:hover{background:var(--brand-light);color:var(--brand-dark);text-decoration:none}
.side a.nav-item.sub{padding:5px 8px 5px 26px;font-size:12.5px;color:var(--ink-3);position:relative;border-left:0}
.side a.nav-item.sub::before{content:"";position:absolute;left:14px;top:50%;width:4px;height:4px;border-radius:50%;background:#c3d4e6;transform:translateY(-50%)}
.side a.nav-item.sub:hover{color:var(--brand-dark);background:var(--brand-light)}

/* ---------- 正文 ---------- */
.main{flex:1;min-width:0;padding:0 0 80px}
.wrap{max-width:1000px;margin:0 auto;padding:0 42px}
.hero{background:#fff;border-bottom:1px solid var(--line);padding:44px 0 34px;margin-bottom:34px}
.hero h1{font-size:30px;line-height:1.4;margin:0 0 10px;letter-spacing:.5px}
.hero .sub{font-size:15.5px;color:var(--ink-2);margin:0 0 18px}
.meta{display:flex;flex-wrap:wrap;gap:10px}
.tag{display:inline-flex;align-items:center;gap:6px;padding:4px 11px;border-radius:999px;font-size:12.5px;line-height:1.6;background:var(--brand-light);color:var(--brand-dark);border:1px solid #cfe0f3}
.tag.gray{background:#f1f4f8;color:var(--ink-2);border-color:#e2e9f1}

h2.sec{font-size:22px;margin:46px 0 14px;padding-top:8px;line-height:1.5;letter-spacing:.3px;border-top:1px solid var(--line)}
h2.sec:first-of-type{border-top:0}
h2.sec .num{color:var(--brand);font-weight:700;margin-right:8px}
h3{font-size:17px;margin:28px 0 10px;line-height:1.6}
h4{font-size:15px;margin:20px 0 8px}
p{margin:10px 0}
ul,ol{margin:10px 0;padding-left:22px}
li{margin:5px 0}
strong{font-weight:700}
.muted{color:var(--ink-2)}
.small{font-size:13px;color:var(--ink-3)}

.callout{display:flex;gap:12px;background:var(--card);border:1px solid var(--line);border-left:4px solid var(--brand);border-radius:var(--radius);padding:15px 18px;margin:18px 0}
.callout .ico{flex:none;width:24px;height:24px;border-radius:50%;background:var(--brand-light);color:var(--brand-dark);display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;margin-top:2px}
.callout.warn{border-left-color:var(--warn);background:var(--warn-bg)}
.callout.warn .ico{background:#f7e4c4;color:var(--warn)}
.callout.ok{border-left-color:var(--ok);background:var(--ok-bg)}
.callout.ok .ico{background:#cfeadd;color:var(--ok)}
.callout p{margin:0}
.callout p+p{margin-top:6px}

.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:16px 0}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px}
.card h4{margin:0 0 6px;font-size:15px}
.card p{margin:0;font-size:13.8px;color:var(--ink-2);line-height:1.75}

table{width:100%;border-collapse:collapse;margin:14px 0;background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;font-size:14px}
th,td{padding:10px 13px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top;line-height:1.7}
th{background:#f3f7fc;font-weight:600;color:var(--ink);white-space:nowrap}
tr:last-child td{border-bottom:0}
td.c{white-space:nowrap}
.badge{display:inline-block;padding:1px 9px;border-radius:999px;font-size:12px;line-height:1.7;white-space:nowrap}
.badge.free{background:var(--ok-bg);color:var(--ok)}
.badge.pay{background:var(--accent-light);color:var(--accent)}
.badge.info{background:var(--brand-light);color:var(--brand-dark)}

.steps{counter-reset:step;list-style:none;padding-left:0;margin:14px 0}
.steps>li{position:relative;padding:2px 0 14px 40px;margin:0}
.steps>li:before{counter-increment:step;content:counter(step);position:absolute;left:0;top:1px;width:24px;height:24px;border-radius:50%;background:var(--brand);color:#fff;font-size:13px;font-weight:700;display:flex;align-items:center;justify-content:center}
.steps>li:after{content:"";position:absolute;left:11.5px;top:29px;bottom:2px;width:1px;background:var(--line)}
.steps>li:last-child{padding-bottom:0}
.steps>li:last-child:after{display:none}
.steps strong{display:inline}

details{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:0 16px;margin:10px 0}
details summary{cursor:pointer;padding:13px 0;font-weight:600;font-size:14.5px;list-style:none;position:relative;padding-right:28px}
details summary::-webkit-details-marker{display:none}
details summary:after{content:"+";position:absolute;right:2px;top:11px;color:var(--brand);font-size:18px;font-weight:400}
details[open] summary:after{content:"－"}
details .ans{padding:0 0 14px;color:var(--ink-2);font-size:14px;border-top:1px dashed var(--line);padding-top:12px}
details .ans p{margin:6px 0}

.checklist{list-style:none;padding-left:0}
.checklist li{position:relative;padding-left:26px}
.checklist li:before{content:"";position:absolute;left:6px;top:11px;width:6px;height:6px;border-radius:50%;background:var(--brand)}

.table-note{font-size:12.5px;color:var(--ink-3);margin:-6px 0 16px}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:24px}
footer.doc{margin-top:60px;padding:26px 0 0;border-top:1px solid var(--line);color:var(--ink-3);font-size:12.5px;line-height:1.9}

/* ---------- 配图 ---------- */
.figure{margin:18px 0;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:10px}
.figure a{display:block}
.figure img{display:block;width:100%;height:auto;border:1px solid #eef3f8;border-radius:6px}
.figure figcaption{margin-top:8px;font-size:12.5px;color:var(--ink-3);text-align:center;line-height:1.7}
.qr-box{max-width:260px;margin:18px 0 8px;text-align:center}
.qr-box img{width:100%;border:1px solid var(--line);border-radius:10px;background:#fff;padding:8px}
.qr-tip{margin-top:8px;font-size:13px;color:var(--ink-3)}

/* ---------- 核心功能菜单 ---------- */
.fn-menu-wrap{background:linear-gradient(180deg,#f2f8ff,#fff);border:1px solid #d7e5f5;border-radius:12px;padding:14px 16px 16px;margin:18px 0 28px}
.fn-menu-title{display:flex;align-items:baseline;gap:10px;margin-bottom:10px}
.fn-menu-title b{font-size:14px;color:var(--brand-dark)}
.fn-menu-title span{font-size:12.5px;color:var(--ink-3)}
.fn-menu{display:grid;grid-template-columns:repeat(auto-fill,minmax(128px,1fr));gap:9px}
.fn-menu a{display:flex;align-items:center;gap:8px;padding:9px 10px;border:1px solid #dbe7f4;border-radius:8px;background:#fff;color:var(--ink-2);font-size:13.5px;line-height:1.3;transition:all .18s}
.fn-menu a:hover{border-color:var(--brand);color:var(--brand-dark);background:var(--brand-light);box-shadow:0 4px 12px rgba(31,95,168,.14);transform:translateY(-1px);text-decoration:none}
.fn-menu b{display:inline-flex;align-items:center;justify-content:center;min-width:22px;height:22px;padding:0 5px;border-radius:6px;background:var(--brand);color:#fff;font-size:11.5px;font-weight:600}
h3{scroll-margin-top:18px}
/* ---------- 多图缩略图 ---------- */
.thumb-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px}
.thumb-grid a{display:block;border:1px solid #e2e8f0;border-radius:6px;overflow:hidden;background:#eef2f7;cursor:zoom-in}
.thumb-grid img{display:block;width:100%;height:auto;aspect-ratio:16/10;object-fit:contain;transition:transform .25s}
.thumb-grid a:hover img{transform:scale(1.04)}
.thumb-grid a.active{border-color:var(--brand);box-shadow:0 0 0 2px rgba(31,95,168,.16)}
.gallery-main{display:block;margin-bottom:10px}
.gallery-main img{display:block;width:100%;height:auto;border:1px solid #eef3f8;border-radius:6px;transition:opacity .2s}
.gallery-main:hover img{opacity:.94}
.gallery-main::after{content:"点击查看原图";display:block;margin-top:6px;font-size:11.5px;color:var(--ink-3);text-align:right}

@media (max-width:1080px){
  .side{display:none}
  .wrap{padding:0 22px}
}
@media (max-width:720px){
  body{font-size:14.5px}
  .hero h1{font-size:24px}
  .cards,.two-col{grid-template-columns:1fr}
  table{font-size:13px}
  th,td{padding:9px 10px}
}
@media print{
  .side{display:none}
  body{background:#fff}
  .wrap{max-width:none;padding:0}
  .hero{border:0}
  details{break-inside:avoid}
  .figure{break-inside:avoid}
  a{color:inherit}
}

.qr-box .js_qrcode{display:inline-block;padding:8px;border:1px solid var(--line);border-radius:10px;background:#fff}
.qr-box .js_qrcode img,.qr-box .js_qrcode canvas{display:block;margin:0 auto}
.qr-box .site-contact__qr-empty{display:inline-block;padding:24px 12px;color:var(--ink-3);font-size:13px}