/* 使用教程文档页 · 政企风 · 与主站统一 */
:root{
  --bg:#f4f7fb; --alt:#eef2f8; --card:#fff; --line:#dbe3ee;
  --blue:#15539b; --blue-d:#0e3c75; --blue-l:#eaf1fa; --gold:#e0a437; --red:#c8102e;
  --ink:#28333f; --head:#16243a; --muted:#5d6b7e;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"Microsoft YaHei","PingFang SC","Segoe UI",system-ui,sans-serif;
  background:var(--bg);color:var(--ink);line-height:1.85;-webkit-font-smoothing:antialiased}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1160px;margin:0 auto;padding:0 24px}

/* topbar */
.topbar{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:30;box-shadow:0 1px 12px rgba(20,40,80,.05)}
.topbar-in{display:flex;align-items:center;justify-content:space-between;height:62px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;color:var(--head)}
.logo .dot{width:32px;height:32px;border-radius:9px;background:linear-gradient(135deg,var(--blue),var(--blue-d));display:grid;place-items:center}
.logo .dot svg{width:19px;height:19px;fill:none;stroke:#fff;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}
.topnav a{color:var(--ink);font-size:15px;margin-left:26px;font-weight:500}
.topnav a:hover{color:var(--blue);text-decoration:none}

/* layout */
.doc-main{padding:34px 0 70px}
.doc-grid{display:grid;grid-template-columns:1fr 280px;gap:46px;align-items:start}
.crumb{font-size:13.5px;color:var(--muted);margin-bottom:18px}
.crumb a{color:var(--muted)}.crumb a:hover{color:var(--blue)}
article{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:44px 50px}
article h1{font-size:30px;color:var(--head);line-height:1.4;margin-bottom:10px}
.meta{color:var(--muted);font-size:13px;margin-bottom:26px;padding-bottom:22px;border-bottom:1px solid var(--line)}
article h2{font-size:21px;color:var(--head);margin:34px 0 14px;padding-left:14px;border-left:4px solid var(--blue)}
article h3{font-size:17px;color:var(--head);margin:24px 0 8px}
article p{margin:12px 0;color:var(--ink);font-size:16px}
article ul,article ol{margin:12px 0 12px 4px;padding-left:24px}
article li{margin:7px 0;font-size:16px;color:var(--ink)}
article b,article strong{color:var(--head)}
.lead{font-size:17px;color:var(--muted);background:var(--blue-l);border-left:4px solid var(--blue);
  padding:16px 20px;border-radius:0 8px 8px 0;margin:20px 0}
.steps{counter-reset:s;list-style:none;padding:0;margin:18px 0}
.steps>li{counter-increment:s;position:relative;padding:4px 0 18px 52px;margin:0}
.steps>li::before{content:counter(s);position:absolute;left:0;top:2px;width:34px;height:34px;border-radius:9px;
  background:var(--blue);color:#fff;font-weight:800;display:grid;place-items:center;font-size:16px}
.steps>li b{display:block;color:var(--head);font-size:16.5px;margin-bottom:2px}
.note{background:var(--blue-l);border:1px solid #cfe0f4;border-radius:10px;padding:16px 20px;margin:22px 0}
.note b{color:var(--blue-d)}
.tip{background:#fff7e8;border:1px solid #f0dcae;border-radius:10px;padding:16px 20px;margin:22px 0}
.tip b{color:#9a6b12}
.shot{margin:22px 0;border:1px solid var(--line);border-radius:10px;overflow:hidden;box-shadow:0 8px 24px rgba(20,50,100,.08)}
.shot img{width:100%;height:auto;display:block}
.shot figcaption{font-size:13px;color:var(--muted);padding:10px 16px;background:var(--alt)}
.faq-q{font-weight:700;color:var(--head);margin:20px 0 6px;font-size:16.5px}
.cta{margin:34px 0 6px;background:linear-gradient(120deg,var(--blue-d),var(--blue));border-radius:12px;padding:26px 30px;color:#fff;display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap}
.cta b{font-size:18px}
.cta a{background:var(--gold);color:#3a2a00;padding:11px 24px;border-radius:8px;font-weight:700}
.cta a:hover{text-decoration:none;filter:brightness(1.05)}

/* sidebar */
.side{position:sticky;top:90px}
.side h4{font-size:14px;color:var(--muted);letter-spacing:1px;margin-bottom:12px}
.side-card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:10px 8px;margin-bottom:20px}
.side-card a{display:block;padding:11px 14px;border-radius:8px;color:var(--ink);font-size:14.5px;font-weight:500}
.side-card a:hover{background:var(--blue-l);color:var(--blue);text-decoration:none}
.side-card a.on{background:var(--blue);color:#fff}

/* docs index */
.doc-hero{background:linear-gradient(120deg,var(--blue-d),var(--blue));color:#fff;padding:54px 0;text-align:center}
.doc-hero h1{font-size:34px;margin-bottom:10px}
.doc-hero p{color:#dce8f7;font-size:17px}
.doc-list{display:grid;grid-template-columns:repeat(2,1fr);gap:22px;margin-top:8px}
.doc-item{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:28px 30px;transition:.2s;display:block;color:var(--ink)}
.doc-item:hover{box-shadow:0 14px 34px rgba(20,50,100,.12);transform:translateY(-3px);text-decoration:none;border-color:#c3d3ea}
.doc-item .t{font-size:19px;font-weight:700;color:var(--head);margin-bottom:8px}
.doc-item .d{font-size:15px;color:var(--muted)}
.doc-item .more{color:var(--blue);font-size:14px;font-weight:600;margin-top:14px;display:inline-block}

footer{background:#0e2747;color:#9fb2cc;padding:28px 0;margin-top:10px}
.foot-in{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;font-size:13px}
.foot-in a{color:#9fb2cc}.foot-in b{color:#d7e3f2}

@media(max-width:880px){
  .doc-grid{grid-template-columns:1fr}.side{display:none}
  article{padding:28px 22px}.doc-list{grid-template-columns:1fr}
  .topnav a{margin-left:16px;font-size:14px}
}