/* ==========================================================================
   Kingtone Spectrum Database — multi-page static site
   浅色主题，零外部依赖
   ========================================================================== */
:root {
  --bg: #f5f7fa;
  --panel: #ffffff;
  --ink: #1d2733;
  --ink2: #5b6472;
  --muted: #8891a0;
  --line: #e3e8ee;
  --brand: #0b3b6f;
  --brand2: #1064c2;
  --accent: #e8792b;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 15px/1.65 -apple-system, "Segoe UI", "Microsoft YaHei", "PingFang SC", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--brand2); text-decoration: none; }
a:hover { text-decoration: underline; }
img, svg { max-width: 100%; }
h1 { font-size: 27px; line-height: 1.3; margin: 6px 0 10px; font-weight: 600; }
h2 { font-size: 19px; margin: 34px 0 14px; padding-left: 10px; border-left: 4px solid var(--brand2); font-weight: 600; }
h3 { margin: 0 0 6px; font-size: 16px; font-weight: 600; }
.muted { color: var(--muted); font-weight: 400; }
.small { font-size: 12.5px; }
.note {
  background: #fff7ec; border: 1px solid #f3ddbb; color: #8a5a17;
  border-radius: 8px; padding: 7px 12px; font-size: 13.5px; display: inline-block; margin: 6px 0 0;
}
code { background: #eef1f5; padding: 1px 6px; border-radius: 4px; font-size: 13px; }

/* ---------- 顶栏 ---------- */
.topbar {
  position: sticky; top: 0; z-index: 20; background: rgba(255,255,255,.96);
  border-bottom: 1px solid var(--line); backdrop-filter: saturate(1.2) blur(6px);
}
.topbar-inner {
  max-width: 1120px; margin: 0 auto; padding: 10px 20px;
  display: flex; align-items: center; gap: 18px; flex-wrap: wrap;
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); }
.brand:hover { text-decoration: none; }
.logo {
  width: 36px; height: 36px; border-radius: 9px; background: var(--brand); color: #fff;
  display: flex; align-items: center; justify-content: center; font-weight: 700; font-size: 14px;
  letter-spacing: .5px; flex: none;
}
.brand b { display: block; line-height: 1.2; font-size: 14.5px; }
.brand small { color: var(--muted); font-size: 11px; letter-spacing: .2px; }
.nav { display: flex; gap: 2px; flex-wrap: wrap; margin-left: auto; }
.nav a { padding: 7px 12px; border-radius: 8px; color: var(--ink2); font-weight: 500; font-size: 14px; }
.nav a:hover { background: #eef2f7; text-decoration: none; }
.nav a.on { background: var(--brand); color: #fff; }
.nav a.site-back { color: var(--brand); border: 1px solid #cfdcea; }
.nav a.site-back:hover { background: #eaf1f9; }
.subnav {
  background: #eef3f8; border-bottom: 1px solid var(--line); font-size: 13px;
}
.subnav-inner { max-width: 1120px; margin: 0 auto; padding: 7px 20px; display: flex; gap: 14px; flex-wrap: wrap; color: var(--ink2); }
.subnav a { color: var(--ink2); }
.subnav span.sep { color: #c3cbd6; }

/* ---------- 布局 ---------- */
main { max-width: 1120px; margin: 0 auto; padding: 22px 20px 56px; }
main.narrow { max-width: 900px; }
.crumbs { font-size: 12.5px; color: var(--muted); margin-bottom: 12px; }
.crumbs a { color: var(--ink2); }
.crumbs span { margin: 0 4px; color: #c3cbd6; }

/* ---------- 首页 ---------- */
.hero {
  background: var(--brand); color: #fff; border-radius: 14px; padding: 38px 34px 30px;
  margin-bottom: 22px;
}
.hero .kicker {
  display: inline-block; font-size: 11.5px; letter-spacing: 1.4px; text-transform: uppercase;
  border: 1px solid rgba(255,255,255,.34); border-radius: 999px; padding: 3px 11px; margin-bottom: 12px;
  color: rgba(255,255,255,.9);
}
.hero h1 { font-size: 32px; margin: 0 0 10px; }
.hero p { max-width: 660px; margin: 0 0 18px; color: rgba(255,255,255,.9); }
.hero-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 22px; }
.hero-stats { display: flex; gap: 30px; flex-wrap: wrap; }
.hero-stats b { display: block; font-size: 24px; font-weight: 600; }
.hero-stats span { font-size: 12px; color: rgba(255,255,255,.75); }

.btn {
  display: inline-block; padding: 9px 18px; border-radius: 9px; font-weight: 600;
  border: 1px solid rgba(255,255,255,.28); background: rgba(255,255,255,.12); color: #fff;
  cursor: pointer; font-size: 14px;
}
.btn:hover { background: rgba(255,255,255,.22); text-decoration: none; }
.btn.primary { background: var(--accent); border-color: var(--accent); }
.btn.primary:hover { background: #f08a41; }
.btn.ghost { background: #fff; color: var(--brand2); border-color: #cfdcea; }
.btn.ghost:hover { background: #f3f7fc; }
main .btn.ghost { color: var(--brand2); }

.grid4 { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 14px; margin-bottom: 8px; }
.grid3 { display: grid; grid-template-columns: repeat(auto-fill, minmax(310px, 1fr)); gap: 14px; }
.grid2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 16px; }
.card {
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px;
  padding: 16px 18px; color: var(--ink); display: block;
}
.card:hover { border-color: #b9c6d6; box-shadow: 0 3px 14px rgba(16,40,70,.07); text-decoration: none; }
.card p { margin: 4px 0 0; color: var(--ink2); font-size: 13.5px; }
.card .count { font-size: 12px; color: var(--muted); margin-top: 8px; display: block; }

/* ---------- 国家卡片 ---------- */
.country .c-head { display: flex; gap: 12px; align-items: center; margin-bottom: 10px; }
.flag { font-size: 28px; line-height: 1; }
.flag.big { font-size: 40px; }
.c-meta { display: flex; gap: 14px; font-size: 12.5px; color: var(--ink2); flex-wrap: wrap; }
.country-head { display: flex; gap: 16px; align-items: flex-start; }
.country-head h1 { margin: 2px 0 4px; }

/* ---------- 图表 ---------- */
.donut-wrap {
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 18px;
  display: flex; gap: 26px; align-items: center; flex-wrap: wrap;
}
.donut { width: 168px; height: 168px; flex: none; }
.donut-legend { display: flex; flex-direction: column; gap: 7px; }
.lg { display: inline-flex; align-items: center; gap: 7px; font-size: 13px; color: var(--ink2); }
.lg i { width: 12px; height: 12px; border-radius: 3px; flex: none; }
.band-card {
  background: var(--panel); border: 1px solid var(--line); border-radius: 12px;
  padding: 14px 18px 12px; margin-bottom: 12px;
}
.band-head { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; flex-wrap: wrap; margin-bottom: 8px; }
.band-legend { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 6px; }
.dot { display: inline-block; width: 11px; height: 11px; border-radius: 3px; margin-right: 6px; vertical-align: -1px; }

/* ---------- 表格 ---------- */
.table-wrap { overflow-x: auto; background: var(--panel); border: 1px solid var(--line); border-radius: 12px; }
table { border-collapse: collapse; width: 100%; font-size: 14px; }
th, td { text-align: left; padding: 9px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
thead th { background: #f2f5f9; font-size: 12.5px; color: var(--ink2); white-space: nowrap; font-weight: 600; }
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover td { background: #f8fafc; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }

/* ---------- 工具 ---------- */
.toolbar { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; margin: 10px 0 18px; }
.search {
  flex: 1; min-width: 240px; padding: 9px 14px; border: 1px solid var(--line); border-radius: 9px;
  font-size: 14px; background: var(--panel); color: var(--ink); outline: none;
}
.search:focus { border-color: var(--brand2); }
.tabs { display: flex; gap: 6px; flex-wrap: wrap; }
.tabs button {
  border: 1px solid var(--line); background: var(--panel); color: var(--ink2);
  padding: 6px 13px; border-radius: 999px; cursor: pointer; font-size: 13px;
}
.tabs button.on { background: var(--brand2); border-color: var(--brand2); color: #fff; }

/* ---------- CTA ---------- */
.cta {
  margin: 30px 0 0; background: #eef3f9; border: 1px solid #d6e2f0; border-radius: 12px;
  padding: 18px 20px; display: flex; gap: 18px; align-items: center; flex-wrap: wrap;
}
.cta .cta-txt { flex: 1; min-width: 260px; }
.cta h3 { font-size: 15px; margin: 0 0 4px; color: var(--brand); }
.cta p { margin: 0; font-size: 13.5px; color: var(--ink2); }

/* ---------- 相关链接 ---------- */
.related { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 10px; }
.chip-link {
  display: inline-flex; align-items: center; gap: 6px; padding: 5px 11px; border-radius: 999px;
  background: var(--panel); border: 1px solid var(--line); font-size: 13px; color: var(--ink2);
}
.chip-link:hover { border-color: #b9c6d6; text-decoration: none; }

/* ---------- 计算器 ---------- */
.calc label { display: block; font-size: 13px; color: var(--ink2); margin: 12px 0 4px; }
.calc select, .calc input {
  width: 100%; padding: 8px 12px; border: 1px solid var(--line); border-radius: 8px;
  font-size: 14px; background: #fbfcfe; color: var(--ink);
}
.calc .btn { margin-top: 14px; }
.calc-out { margin-top: 14px; }
.calc-out table td, .calc-out table th { border: none; border-bottom: 1px dashed var(--line); }
.calc-out b { color: var(--brand2); font-size: 16px; }
.warn { color: #c0392b; font-size: 13px; }

/* ---------- 免责声明 / 页脚 ---------- */
.disclaimer {
  margin-top: 34px; background: #f2f5f9; border: 1px solid var(--line);
  border-radius: 12px; padding: 14px 18px; font-size: 13px; color: var(--ink2);
}
.footer { border-top: 1px solid var(--line); background: var(--panel); margin-top: 20px; }
.footer-inner {
  max-width: 1120px; margin: 0 auto; padding: 22px 20px 26px; font-size: 13px; color: var(--ink2);
  display: flex; justify-content: space-between; gap: 18px; flex-wrap: wrap;
}
.footer a { color: var(--ink2); }
.footer-links { display: flex; gap: 14px; flex-wrap: wrap; }

@media (max-width: 760px) {
  .topbar-inner { padding: 10px 14px; gap: 10px; }
  .nav { margin-left: 0; }
  .nav a { padding: 6px 9px; font-size: 13px; }
  main { padding: 18px 14px 44px; }
  .hero { padding: 26px 20px; }
  .hero h1 { font-size: 24px; }
  .hero-stats { gap: 20px; }
  h1 { font-size: 22px; }
}