:root {
  --ink: #17212f;
  --ink-2: #3c4a5c;
  --muted: #6d7c8f;
  --brand: #1462b5;
  --brand-dark: #0d4a8a;
  --brand-soft: #eaf2fb;
  --line: #dfe6ee;
  --bg: #f5f8fb;
  --card: #ffffff;
  --ok: #1f7a4d;
  --warn: #a86400;
  --radius: 10px;
  --shadow: 0 2px 14px rgba(23, 43, 70, .07);
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 15px/1.75 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--brand); text-decoration: none; }
a:hover { color: var(--brand-dark); }
img { max-width: 100%; display: block; }
button, input, select, textarea { font: inherit; }
.container { max-width: 1160px; margin: 0 auto; padding: 0 22px; }

/* 站点头 */
.site-header { background: #fff; border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 30; }
.header-inner { display: flex; align-items: center; gap: 26px; min-height: 68px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 700; font-size: 18px; letter-spacing: .3px; white-space: nowrap; }
.brand:hover { color: var(--ink); }
.brand-mark { width: 30px; height: 30px; flex: 0 0 30px; }
.site-nav { display: flex; gap: 4px; margin-left: auto; flex-wrap: wrap; }
.site-nav a { padding: 8px 13px; border-radius: 6px; color: var(--ink-2); font-size: 14.5px; white-space: nowrap; }
.site-nav a:hover { background: var(--brand-soft); color: var(--brand); }
.site-nav a.active { color: var(--brand); font-weight: 600; background: var(--brand-soft); }
.header-cta { display: inline-block; padding: 8px 17px; background: var(--brand); color: #fff; border-radius: 6px; font-size: 14px; font-weight: 600; white-space: nowrap; }
.header-cta:hover { background: var(--brand-dark); color: #fff; }
.nav-toggle { display: none; margin-left: auto; background: #fff; border: 1px solid var(--line); border-radius: 6px; padding: 6px 12px; cursor: pointer; color: var(--ink); }

/* 通用区块 */
main { min-height: 60vh; }
.section { padding: 56px 0; }
.section-sm { padding: 34px 0; }
.section-head { margin-bottom: 28px; }
.section-head .eyebrow { color: var(--brand); font-size: 13px; font-weight: 700; letter-spacing: 1px; text-transform: uppercase; }
.section-head h1, .section-head h2 { margin: 8px 0 10px; font-size: 30px; line-height: 1.35; letter-spacing: -.3px; }
.section-head p { margin: 0; color: var(--muted); max-width: 760px; }
.page-banner { background: #fff; border-bottom: 1px solid var(--line); padding: 44px 0 38px; }
.page-banner h1 { font-size: 32px; margin: 0 0 10px; }
.page-banner p { margin: 0; color: var(--muted); max-width: 760px; }
.crumb { font-size: 13px; color: var(--muted); margin-bottom: 12px; }
.crumb a { color: var(--muted); }
.crumb span { margin: 0 7px; }

/* 首页首屏 */
.hero { background: #fff; border-bottom: 1px solid var(--line); }
.hero-inner { display: grid; grid-template-columns: 1.15fr .85fr; gap: 54px; align-items: center; padding: 72px 22px 76px; max-width: 1160px; margin: 0 auto; }
.hero h1 { font-size: 40px; line-height: 1.28; margin: 0 0 18px; letter-spacing: -.6px; }
.hero p.lead { color: var(--ink-2); font-size: 16.5px; margin: 0 0 14px; max-width: 620px; }
.hero .hero-note { color: var(--muted); font-size: 14px; margin: 0 0 28px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.btn { display: inline-block; padding: 11px 22px; border-radius: 7px; font-weight: 600; font-size: 15px; cursor: pointer; border: 1px solid transparent; }
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-dark); color: #fff; }
.btn-ghost { background: #fff; color: var(--brand); border-color: #bcd2ea; }
.btn-ghost:hover { background: var(--brand-soft); }
.btn:disabled { opacity: .6; cursor: not-allowed; }
.hero-panel { background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; }
.hero-panel h3 { margin: 0 0 16px; font-size: 16px; }
.hero-panel ol { margin: 0; padding-left: 20px; color: var(--ink-2); }
.hero-panel li { padding: 7px 0; border-bottom: 1px dashed var(--line); }
.hero-panel li:last-child { border-bottom: 0; }
.hero-panel li b { color: var(--brand); margin-right: 8px; }

/* 卡片栅格 */
.grid { display: grid; gap: 18px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); }
.card h3 { margin: 0 0 10px; font-size: 18px; }
.card p { margin: 0; color: var(--ink-2); font-size: 14.5px; }
.card .card-index { color: var(--brand); font-weight: 700; font-size: 13px; letter-spacing: 1px; }
.card-link { display: block; color: inherit; }
.card-link:hover { border-color: #b6cde7; box-shadow: 0 6px 20px rgba(20, 98, 181, .12); }
.card-link:hover h3 { color: var(--brand); }
.card-meta { margin-top: 14px; color: var(--muted); font-size: 13px; }
.tag { display: inline-block; padding: 2px 9px; background: var(--brand-soft); color: var(--brand); border-radius: 20px; font-size: 12px; margin-right: 6px; }
.tag-gray { background: #eef1f5; color: var(--muted); }

/* 列表与详情 */
.list-item { display: block; background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 22px 24px; margin-bottom: 14px; }
.list-item:hover { border-color: #b6cde7; }
.list-item h3 { margin: 0 0 8px; font-size: 19px; }
.list-item p { margin: 0 0 10px; color: var(--ink-2); }
.list-item .meta { color: var(--muted); font-size: 13px; }
.article { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 36px 40px; }
.article h1 { font-size: 30px; margin: 0 0 12px; }
.article .meta { color: var(--muted); font-size: 13px; border-bottom: 1px solid var(--line); padding-bottom: 16px; margin-bottom: 24px; }
.prose { color: var(--ink-2); font-size: 15.5px; line-height: 1.9; }
.prose h3 { color: var(--ink); font-size: 18px; margin: 26px 0 10px; }
.prose p { margin: 0 0 16px; }
.prose ul { padding-left: 22px; margin: 0 0 18px; }
.prose li { margin-bottom: 7px; }

/* 表单 */
.form-card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 30px; box-shadow: var(--shadow); }
.field { margin-bottom: 18px; }
.field label { display: block; font-weight: 600; font-size: 14px; margin-bottom: 7px; }
.field label .req { color: #c0392b; }
.field input, .field select, .field textarea {
  width: 100%; padding: 10px 12px; border: 1px solid #cfd9e4; border-radius: 6px;
  background: #fff; color: var(--ink); outline: none;
}
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--brand); box-shadow: 0 0 0 3px rgba(20, 98, 181, .12); }
.field textarea { min-height: 116px; resize: vertical; }
.field .hint { color: var(--muted); font-size: 12.5px; margin-top: 5px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 0 18px; }
.form-msg { margin-top: 14px; font-size: 14px; min-height: 22px; }
.form-msg.error { color: #b3261e; }
.form-msg.ok { color: var(--ok); }
.result-box { background: var(--brand-soft); border: 1px solid #c8dcf2; border-radius: 8px; padding: 20px; }
.result-box .code { font-size: 24px; font-weight: 700; letter-spacing: 2px; color: var(--brand-dark); font-family: ui-monospace, Consolas, monospace; }

/* 联系信息 */
.info-list { list-style: none; padding: 0; margin: 0; }
.info-list li { padding: 12px 0; border-bottom: 1px solid var(--line); }
.info-list li:last-child { border: 0; }
.info-list .k { color: var(--muted); font-size: 13px; display: block; }
.info-list .v { color: var(--ink); font-size: 15px; }

/* 页脚 */
.site-footer { background: #17212f; color: #b9c5d3; padding: 46px 0 0; margin-top: 40px; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.2fr; gap: 32px; padding-bottom: 34px; }
.site-footer h4 { color: #fff; font-size: 15px; margin: 0 0 14px; }
.site-footer p { margin: 0 0 10px; font-size: 14px; }
.site-footer a { color: #b9c5d3; }
.site-footer a:hover { color: #fff; }
.footer-links { list-style: none; padding: 0; margin: 0; }
.footer-links li { margin-bottom: 8px; font-size: 14px; }
.footer-bottom { border-top: 1px solid #2a3746; padding: 18px 0 22px; font-size: 13px; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.footer-bottom a { color: #d7e3f0; }
.icp-link { display: inline-block; margin-right: 14px; }

/* 反馈与状态 */
.notice { padding: 14px 18px; border-radius: 8px; background: var(--brand-soft); border: 1px solid #c8dcf2; color: var(--ink-2); }
.notice.error { background: #fdf0ef; border-color: #f0c9c5; color: #8e2b23; }
.loading { color: var(--muted); padding: 26px 0; }
.empty { color: var(--muted); padding: 30px; text-align: center; border: 1px dashed var(--line); border-radius: 8px; background: #fff; }
.pager { display: flex; gap: 8px; justify-content: center; margin-top: 26px; flex-wrap: wrap; }
.pager button { border: 1px solid var(--line); background: #fff; color: var(--ink-2); padding: 7px 14px; border-radius: 6px; cursor: pointer; }
.pager button.active { background: var(--brand); color: #fff; border-color: var(--brand); }
.pager button:disabled { opacity: .45; cursor: not-allowed; }

@media (max-width: 980px) {
  .hero-inner { grid-template-columns: 1fr; gap: 32px; padding: 52px 22px; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .site-nav { display: none; width: 100%; order: 3; flex-direction: column; margin: 0 0 12px; }
  .site-nav.open { display: flex; }
  .nav-toggle { display: inline-block; }
  .header-inner { flex-wrap: wrap; gap: 10px; padding-top: 12px; padding-bottom: 12px; }
  .header-cta { display: none; }
  .grid-2, .grid-3, .grid-4, .form-row { grid-template-columns: 1fr; }
  .section { padding: 38px 0; }
  .hero h1 { font-size: 30px; }
  .section-head h1, .section-head h2, .page-banner h1 { font-size: 25px; }
  .article { padding: 24px 20px; }
  .footer-grid { grid-template-columns: 1fr; }
}
@media print {
  .site-header, .site-footer, .hero-actions, .pager { display: none !important; }
  body { background: #fff; }
}