:root {
  --brand: #0e5fb0;
  --brand-dark: #0a4a8c;
  --brand-soft: #e8f1fb;
  --accent: #0f9d76;
  --bg: #eef1f5;
  --surface: #ffffff;
  --text: #16202c;
  --muted: #5b6b7c;
  --border: #d7dde5;
  --danger: #c0392b;
  --ok: #0f9d76;
  --wait: #b8860b;
  --bad: #c0392b;
  --radius: 2px;
  --shadow: 0 1px 3px rgba(16,32,44,.08), 0 6px 18px rgba(16,32,44,.06);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", "Microsoft YaHei", "PingFang SC", system-ui, -apple-system, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: 1080px; margin: 0 auto; padding: 0 20px; }

/* ---------- 顶部导航 ---------- */
.topbar {
  background: var(--brand-dark);
  border-bottom: 3px solid var(--brand);
  position: sticky; top: 0; z-index: 50;
}
.topbar .container { display: flex; align-items: center; gap: 18px; height: 62px; }
.brand { display: flex; align-items: center; gap: 10px; color: #fff; font-weight: 700; letter-spacing: .5px; }
.brand .logo {
  width: 30px; height: 30px; background: #fff; color: var(--brand-dark);
  display: grid; place-items: center; font-weight: 800; border-radius: var(--radius);
}
.brand small { font-weight: 400; opacity: .8; font-size: 12px; }
.nav { margin-left: auto; display: flex; gap: 6px; align-items: center; }
.nav a {
  color: #dce8f5; padding: 8px 12px; border-radius: var(--radius); font-size: 14px;
}
.nav a:hover, .nav a.active { background: rgba(255,255,255,.12); color: #fff; text-decoration: none; }

/* ---------- 通用卡片 / 按钮 ---------- */
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow); padding: 24px; margin-bottom: 22px;
}
.card h2 { margin: 0 0 16px; font-size: 18px; border-left: 4px solid var(--brand); padding-left: 10px; }
.card h3 { font-size: 15px; margin: 18px 0 10px; color: var(--brand-dark); }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  background: var(--brand); color: #fff; border: 1px solid var(--brand-dark);
  padding: 10px 18px; border-radius: var(--radius); cursor: pointer; font-size: 14px;
  font-weight: 600; transition: background .15s ease;
}
.btn:hover { background: var(--brand-dark); color: #fff; text-decoration: none; }
.btn.secondary { background: #fff; color: var(--brand-dark); border-color: var(--border); }
.btn.secondary:hover { background: var(--brand-soft); }
.btn.ghost { background: transparent; color: var(--muted); border-color: var(--border); }
.btn.ghost:hover { background: #f3f5f8; color: var(--text); }
.btn.danger { background: var(--danger); border-color: #922b21; }
.btn.ok { background: var(--ok); border-color: #0b7d5d; }
.btn.sm { padding: 6px 12px; font-size: 13px; }
.btn.block { width: 100%; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* ---------- 表单 ---------- */
.field { margin-bottom: 16px; }
.field label { display: block; font-weight: 600; margin-bottom: 6px; font-size: 14px; }
.field .hint { color: var(--muted); font-size: 12px; margin-top: 4px; }
input[type=text], input[type=email], input[type=password], input[type=url],
select, textarea {
  width: 100%; padding: 10px 12px; border: 1px solid var(--border);
  border-radius: var(--radius); background: #fff; font-size: 14px; color: var(--text);
  font-family: inherit;
}
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px var(--brand-soft); }
.row { display: flex; gap: 16px; flex-wrap: wrap; }
.row .field { flex: 1; min-width: 220px; }

/* ---------- 网格 / 统计 ---------- */
.grid { display: grid; gap: 16px; }
.grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 760px) { .grid.cols-2, .grid.cols-3 { grid-template-columns: 1fr; } }

.stat { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; }
.stat .num { font-size: 28px; font-weight: 800; color: var(--brand-dark); }
.stat .lbl { color: var(--muted); font-size: 13px; }

/* ---------- 徽标 ---------- */
.tag { display: inline-block; padding: 3px 10px; border-radius: var(--radius); font-size: 12px; font-weight: 700; }
.tag.ok { background: #e3f6ef; color: var(--ok); }
.tag.wait { background: #fbf2dc; color: var(--wait); }
.tag.bad { background: #fbe6e3; color: var(--bad); }

/* ---------- 认证区 ---------- */
.auth-split { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 760px) { .auth-split { grid-template-columns: 1fr; } }
.auth-box { border: 1px dashed var(--border); border-radius: var(--radius); padding: 22px; background: #fbfcfe; }
.auth-box.locked { opacity: .65; }
.auth-box .step { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: 1px; }

/* ---------- 图片预览 ---------- */
.img-grid { display: flex; gap: 12px; flex-wrap: wrap; }
.img-grid figure { margin: 0; }
.img-grid img { width: 150px; height: 95px; object-fit: cover; border: 1px solid var(--border); border-radius: var(--radius); background: #f1f3f6; display: block; }
.img-grid figcaption { font-size: 12px; color: var(--muted); margin-top: 4px; }

/* ---------- 表格 ---------- */
.table { width: 100%; border-collapse: collapse; font-size: 14px; }
.table th, .table td { border: 1px solid var(--border); padding: 10px 12px; text-align: left; vertical-align: top; }
.table th { background: #f3f6fa; color: var(--brand-dark); font-weight: 700; }
.table tr:nth-child(even) td { background: #fafbfc; }
.table img.thumb { width: 70px; height: 46px; object-fit: cover; border: 1px solid var(--border); border-radius: var(--radius); }

/* ---------- 提示 ---------- */
.alert { padding: 12px 14px; border-radius: var(--radius); margin-bottom: 16px; font-size: 14px; border: 1px solid; }
.alert.info { background: var(--brand-soft); border-color: #bcd6f2; color: var(--brand-dark); }
.alert.ok { background: #e3f6ef; border-color: #b6e6d4; color: #0b7d5d; }
.alert.bad { background: #fbe6e3; border-color: #f0c4bd; color: #922b21; }

/* ---------- 代码块（对接文档） ---------- */
.doc { font-size: 14px; }
.doc pre {
  background: #0f1b2a; color: #d6e6f5; padding: 16px; border-radius: var(--radius);
  overflow: auto; font-family: "Cascadia Code", Consolas, "Courier New", monospace; font-size: 13px; line-height: 1.55;
}
.doc code { background: #eef3f9; padding: 1px 5px; border-radius: var(--radius); font-size: 13px; }
.kv { display: grid; grid-template-columns: 200px 1fr; gap: 8px 14px; margin: 10px 0 18px; }
.kv dt { color: var(--muted); font-weight: 600; }
.kv dd { margin: 0; word-break: break-all; }
.kv code { background: #eef3f9; padding: 2px 6px; border-radius: var(--radius); }

/* ---------- 英雄区 ---------- */
.hero { background: linear-gradient(135deg, var(--brand-dark), var(--brand)); color: #fff; padding: 56px 0; }
.hero h1 { font-size: 30px; margin: 0 0 12px; }
.hero p { max-width: 640px; opacity: .92; margin: 0 0 22px; }
.hero .badges { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 18px; }
.hero .badges span { background: rgba(255,255,255,.14); padding: 6px 12px; border-radius: var(--radius); font-size: 13px; }

.section { padding: 40px 0; }
.section h2 { font-size: 22px; border-left: 4px solid var(--brand); padding-left: 10px; margin: 0 0 8px; }
.section .lead { color: var(--muted); margin: 0 0 24px; }

.feature { padding: 20px; border: 1px solid var(--border); border-radius: var(--radius); background: #fff; }
.feature .ico { width: 38px; height: 38px; background: var(--brand-soft); color: var(--brand-dark); display: grid; place-items: center; border-radius: var(--radius); font-weight: 800; margin-bottom: 12px; }
.feature h3 { margin: 0 0 8px; font-size: 16px; }
.feature p { color: var(--muted); margin: 0; font-size: 14px; }

/* ---------- 底部 ---------- */
.footer { background: var(--brand-dark); color: #cfe0f2; margin-top: 40px; }
.footer .container { padding: 26px 20px; }
.footer .links { display: flex; gap: 24px; flex-wrap: wrap; font-size: 13px; margin-bottom: 14px; }
.footer .links a { color: #cfe0f2; }
.footer .copy { font-size: 13px; line-height: 1.9; border-top: 1px solid rgba(255,255,255,.12); padding-top: 14px; }
.footer .beian { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; margin-top: 12px; }
.footer .beian a { display: inline-flex; align-items: center; gap: 6px; color: #cfe0f2; font-size: 12px; }
.footer .beian img { height: 22px; width: auto; display: block; }

/* ---------- 二维码 / 登录布局 ---------- */
.auth-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; align-items: start; }
@media (max-width: 820px) { .auth-wrap { grid-template-columns: 1fr; } }
.auth-aside { background: linear-gradient(135deg, var(--brand-dark), var(--brand)); color: #fff; padding: 30px; border-radius: var(--radius); }
.auth-aside h3 { margin-top: 0; }
.auth-aside ul { padding-left: 18px; margin: 12px 0 0; }
.auth-aside li { margin-bottom: 8px; font-size: 14px; opacity: .95; }

/* ---------- 滚动揭示初始态 ---------- */
.reveal { opacity: 0; transform: translateY(18px); }
.reveal.in { opacity: 1; transform: none; }

/* ---------- 杂项 ---------- */
.muted { color: var(--muted); }
.right { text-align: right; }
.center { text-align: center; }
.mt { margin-top: 16px; }
.mb { margin-bottom: 16px; }
.divider { height: 1px; background: var(--border); margin: 18px 0; }
.empty { color: var(--muted); padding: 24px; text-align: center; border: 1px dashed var(--border); border-radius: var(--radius); }