/* ============================================================
   运输运营台账 · 公开说明页
   设计语言：细线 + 白面 + 单一工业蓝，与后台保持一致
   ============================================================ */

:root {
  --bg: #F5F7FA;
  --surface: #FFFFFF;
  --surface-2: #FAFBFC;
  --line: #E4E9F0;
  --line-2: #D2DAE6;
  --ink: #16202E;
  --ink-2: #55637A;
  --ink-3: #8B96A8;
  --brand: #1B58D9;
  --brand-ink: #1446AE;
  --brand-soft: #EDF3FE;
  --plate-bg: #FBEFD0;
  --plate-ink: #5B4200;
  --plate-line: #E6D6A6;
  --r: 8px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --mono: "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
  --ease: cubic-bezier(.2, .8, .2, 1);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { margin: 0; font-weight: 600; letter-spacing: -.01em; line-height: 1.3; }
p { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }

.wrap { width: 100%; max-width: 1120px; margin: 0 auto; padding: 0 28px; }
.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; font-feature-settings: "tnum" 1; }

/* ---------------- 顶栏 ---------------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, .88);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.topbar .wrap { display: flex; align-items: center; gap: 28px; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; }
.brand:hover { text-decoration: none; }
.brand .mark {
  width: 30px; height: 30px; border-radius: 7px;
  background: var(--brand); color: #fff;
  display: grid; place-items: center; flex: none;
}
.brand .mark svg { width: 17px; height: 17px; }
.brand b { font-size: 15.5px; font-weight: 650; letter-spacing: -.01em; }
.brand span { color: var(--ink-3); font-size: 12.5px; letter-spacing: .06em; }
.topnav { display: flex; gap: 26px; margin-left: auto; }
.topnav a { color: var(--ink-2); font-size: 14.5px; }
.topnav a:hover { color: var(--ink); text-decoration: none; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 7px;
  height: 36px; padding: 0 16px; border-radius: 7px;
  border: 1px solid var(--line-2); background: var(--surface); color: var(--ink);
  font: inherit; font-size: 14px; font-weight: 500; cursor: pointer;
  transition: background .16s var(--ease), border-color .16s var(--ease), transform .16s var(--ease);
}
.btn:hover { background: var(--surface-2); border-color: #BFC9D8; text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn svg { width: 15px; height: 15px; }
.btn.primary { background: var(--brand); border-color: var(--brand); color: #fff; }
.btn.primary:hover { background: var(--brand-ink); border-color: var(--brand-ink); }
.btn.lg { height: 42px; padding: 0 22px; font-size: 15px; }

/* ---------------- Hero ---------------- */
.hero { padding: 72px 0 56px; border-bottom: 1px solid var(--line); background: var(--surface); }
.kicker {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12.5px; letter-spacing: .1em; text-transform: uppercase;
  color: var(--brand); font-weight: 600; margin-bottom: 18px;
}
.kicker::before { content: ""; width: 22px; height: 1.5px; background: var(--brand); }
.hero h1 { font-size: clamp(30px, 4.4vw, 46px); letter-spacing: -.025em; max-width: 16em; }
.lede { margin-top: 20px; max-width: 44em; font-size: 16.5px; color: var(--ink-2); line-height: 1.75; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }

.facts { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; margin: 46px 0 0; background: var(--line); border: 1px solid var(--line); border-radius: var(--r); overflow: hidden; }
.facts > div { background: var(--surface); padding: 18px 20px; }
.facts dt { font-size: 12.5px; color: var(--ink-3); letter-spacing: .02em; }
.facts dd { margin: 4px 0 0; font-size: 22px; font-weight: 620; letter-spacing: -.02em; }
.facts dd em { font-style: normal; font-size: 13px; font-weight: 500; color: var(--ink-3); margin-left: 3px; }

/* ---------------- 通用区块 ---------------- */
.section { padding: 64px 0; border-bottom: 1px solid var(--line); }
.section.alt { background: var(--surface); }
.sec-head { margin-bottom: 30px; }
.sec-head .idx { font-family: var(--mono); font-size: 12px; letter-spacing: .12em; color: var(--brand); font-weight: 600; }
.sec-head h2 { font-size: clamp(22px, 2.6vw, 28px); margin-top: 8px; }
.sec-head p { margin-top: 10px; color: var(--ink-2); max-width: 40em; }

/* ---------------- 记录范围卡片 ---------------- */
.grid-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.fcard {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--r);
  padding: 20px 20px 18px; transition: border-color .18s var(--ease), box-shadow .18s var(--ease);
}
.fcard:hover { border-color: var(--line-2); box-shadow: 0 2px 10px rgba(22, 32, 46, .05); }
.fcard .ico {
  width: 34px; height: 34px; border-radius: 7px; display: grid; place-items: center;
  background: var(--brand-soft); color: var(--brand); margin-bottom: 14px;
}
.fcard .ico svg { width: 18px; height: 18px; }
.fcard h3 { font-size: 15.5px; }
.fcard p { margin-top: 7px; font-size: 14px; color: var(--ink-2); }
.fcard .fields-line { margin-top: 14px; padding-top: 13px; border-top: 1px dashed var(--line); font-size: 12.5px; color: var(--ink-3); }

/* ---------------- 字段清单 Tabs ---------------- */
.tabs { display: flex; gap: 4px; flex-wrap: wrap; margin-bottom: 18px; }
.tab {
  padding: 7px 14px; border-radius: 999px; border: 1px solid var(--line);
  background: var(--surface); color: var(--ink-2); font: inherit; font-size: 13.5px;
  cursor: pointer; transition: all .16s var(--ease);
}
.tab:hover { border-color: var(--line-2); color: var(--ink); }
.tab[aria-selected="true"] { background: var(--ink); border-color: var(--ink); color: #fff; }
.panel { display: none; }
.panel.on { display: block; }
.fieldlist { display: grid; grid-template-columns: repeat(auto-fill, minmax(232px, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--r); overflow: hidden; }
.fieldlist li { background: var(--surface); padding: 12px 15px; display: flex; align-items: baseline; gap: 10px; }
.fieldlist .n { font-family: var(--mono); font-size: 14px; font-weight: 500; color: var(--ink); }
.fieldlist .t { font-size: 12px; color: var(--ink-3); margin-left: auto; white-space: nowrap; }

/* ---------------- 说明 ---------------- */
.notes { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.note { background: var(--surface); border: 1px solid var(--line); border-left: 2px solid var(--brand); border-radius: 6px; padding: 16px 18px; }
.note h4 { font-size: 14.5px; }
.note p { margin-top: 6px; font-size: 13.5px; color: var(--ink-2); }

.disclaimer { margin-top: 22px; padding: 18px 20px; background: var(--surface-2); border: 1px dashed var(--line-2); border-radius: var(--r); font-size: 13.5px; color: var(--ink-2); }
.disclaimer b { color: var(--ink); font-weight: 600; }

/* ---------------- 页脚 ---------------- */
footer { background: var(--surface); padding: 40px 0 44px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 18px 40px; align-items: flex-start; }
footer .col h5 { font-size: 13px; color: var(--ink); margin-bottom: 8px; font-weight: 600; }
footer .col li { font-size: 13px; color: var(--ink-2); line-height: 1.9; }
.fmeta { margin-left: auto; text-align: right; font-size: 12.5px; color: var(--ink-3); line-height: 1.9; }
.copyright { border-top: 1px solid var(--line); margin-top: 26px; padding-top: 18px; font-size: 12.5px; color: var(--ink-3); display: flex; flex-wrap: wrap; gap: 8px 18px; }
.copyright a { color: var(--ink-2); }

/* ---------------- 响应式 ---------------- */
@media (max-width: 900px) {
  .grid-cards { grid-template-columns: repeat(2, 1fr); }
  .notes { grid-template-columns: 1fr; }
  .topnav { display: none; }
}
@media (max-width: 660px) {
  .wrap { padding: 0 18px; }
  .grid-cards { grid-template-columns: 1fr; }
  .facts { grid-template-columns: repeat(2, 1fr); }
  .hero { padding: 46px 0 40px; }
  .fmeta { margin-left: 0; text-align: left; }
}