/* ===== 设计变量 ===== */
:root {
  --bg: #f7f6f3;
  --surface: #ffffff;
  --text: #1c1c1e;
  --text-dim: #6b6b70;
  --border: #e2e0da;
  --accent: #0064b0;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.07), 0 4px 16px rgba(0, 0, 0, 0.05);
  --radius: 12px;

  /* IDFM 线路色（2019 版官方色板，源自 IDFM 开放数据 referentiel-des-lignes） */
  --m1: #ffbe00; --m2: #0055c8; --m3: #6e6e00; --m3bis: #82c8e6;
  --m4: #a0006e; --m5: #ff5a00; --m6: #82dc73; --m7: #ff82b4;
  --m7bis: #82dc73; --m8: #d282be; --m9: #d2d200; --m10: #dc9600;
  --m11: #6e491e; --m12: #00643c; --m13: #82c8e6; --m14: #640082;
  --rer-a: #eb2132; --rer-b: #5091cb; --rer-c: #ffcc30;
  --rer-d: #008b5b; --rer-e: #b94e9a;

  /* Châtelet–Les Halles 三扇区官方导向色（取自站内导向牌照片：橄榄金 / 灰褐 / 蓝灰） */
  --sect-forum: #a2993f; --sect-rivoli: #8a7969; --sect-seine: #7ea9be;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17171a;
    --surface: #232327;
    --text: #ececee;
    --text-dim: #9a9aa1;
    --border: #37373d;
    --accent: #6ab2e8;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4), 0 4px 16px rgba(0, 0, 0, 0.3);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    -apple-system, "Segoe UI", sans-serif;
  line-height: 1.65;
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 4rem;
}

h1 { font-size: 1.7rem; margin: 1rem 0 0.3rem; }
h2 { font-size: 1.25rem; margin-top: 2.2rem; }
h3 { font-size: 1.05rem; }
a { color: var(--accent); }
p.lead { color: var(--text-dim); margin-top: 0; }

/* ===== 顶部导航（由 site.js 注入） ===== */
.site-nav {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 20;
}
.site-nav .inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.25rem;
  display: flex;
  align-items: center;
  gap: 1.4rem;
  overflow-x: auto;
}
.site-nav .brand {
  font-weight: 700;
  padding: 0.7rem 0;
  white-space: nowrap;
  color: var(--text);
  text-decoration: none;
}
.site-nav a.nav-link {
  color: var(--text-dim);
  text-decoration: none;
  padding: 0.7rem 0;
  white-space: nowrap;
  border-bottom: 2px solid transparent;
}
.site-nav a.nav-link:hover { color: var(--text); }
.site-nav a.nav-link.active {
  color: var(--text);
  border-bottom-color: var(--accent);
}

/* ===== 线路标志 ===== */
.line {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 50%;
  font-weight: 700;
  font-size: 0.85rem;
  color: #fff;
  flex: none;
  font-family: -apple-system, "Segoe UI", Arial, sans-serif;
}
/* 3bis / 7bis 等长名称缩小字号以适应圆形 */
.line.long { font-size: 0.55rem; letter-spacing: -0.03em; }
.line.dark-text { color: #1c1c1e; }
.line.rer { border-radius: 0.28em; }

/* 未来才会使用该车型的线路：虚线圈 */
.line.future-line {
  opacity: 0.88;
  outline: 2px dashed var(--text-dim);
  outline-offset: 2px;
}

/* ===== 卡片（首页导航等） ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}
.card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.1rem 1.25rem;
  text-decoration: none;
  color: var(--text);
  transition: transform 0.12s ease;
}
.card:hover { transform: translateY(-2px); }
.card h3 { margin: 0 0 0.35rem; }
.card p { margin: 0; color: var(--text-dim); font-size: 0.92rem; }
.card .card-lines { margin-top: 0.7rem; display: flex; gap: 0.35rem; flex-wrap: wrap; }

/* ===== 通用面板 ===== */
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.1rem 1.25rem;
}

.note {
  font-size: 0.88rem;
  color: var(--text-dim);
  border-left: 3px solid var(--border);
  padding-left: 0.8rem;
  margin: 1.2rem 0;
}

footer.site-footer {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 2.5rem;
  color: var(--text-dim);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
}

/* 横向可滚动容器：宽内容不得撑破页面 */
.scroll-x { overflow-x: auto; }

/* ===== 车型页 ===== */
.stock-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-top: 1.5rem;
}
@media (min-width: 900px) {
  .stock-grid { grid-template-columns: 1fr 1fr; align-items: start; }
}

.stock-panel { padding-bottom: 1.4rem; }
.stock-title { margin: 0.2rem 0 0.2rem; }
.stock-subtitle { margin: 0 0 1rem; color: var(--text-dim); font-size: 0.9rem; }

.stock-table-wrap {
  position: relative;
  /* 右侧留出箭头走线槽 */
  padding-right: 64px;
  overflow-x: auto;
}
.stock-table {
  border-collapse: collapse;
  width: 100%;
}
.stock-table th {
  text-align: left;
  font-size: 0.82rem;
  color: var(--text-dim);
  font-weight: 600;
  padding: 0.4rem 0.6rem;
  border-bottom: 2px solid var(--border);
}
.stock-table td {
  padding: 0.65rem 0.6rem;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}
.stock-table tbody tr:last-child td { border-bottom: none; }

.cell-model { min-width: 10.5em; }
.model-name-row { display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; }
.model-name { font-weight: 700; font-size: 1.02rem; white-space: nowrap; }
.model-year { color: var(--text-dim); font-size: 0.8rem; }
.model-note { color: var(--text-dim); font-size: 0.8rem; margin-top: 0.15rem; }

.status {
  font-size: 0.68rem;
  font-weight: 600;
  padding: 0.1em 0.55em;
  border-radius: 99px;
  white-space: nowrap;
}
.st-active { background: rgba(0, 129, 79, 0.15); color: #00814f; }
.st-out { background: rgba(200, 70, 40, 0.15); color: #c84628; }
.st-new { background: rgba(0, 100, 176, 0.15); color: var(--accent); }
.st-future { background: rgba(102, 36, 131, 0.14); color: #9457b8; }
@media (prefers-color-scheme: dark) {
  .st-active { color: #6fcfa5; }
  .st-out { color: #f0906f; }
  .st-future { color: #c39ad9; }
}

.line-wrap { display: flex; gap: 0.45rem; flex-wrap: wrap; align-items: center; }
.line-item { display: inline-flex; }

.arrow-layer {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: visible;
}
.arrow-path {
  fill: none;
  stroke-width: 2.2;
  opacity: 0.85;
}
.transition-sched { margin-top: 1.1rem; }
.transition-sched h3 {
  margin: 0 0 0.4rem;
  font-size: 0.85rem;
  color: var(--text-dim);
  text-transform: none;
}
.transition-sched ul { list-style: none; padding: 0; margin: 0; }
.transition-sched li {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-size: 0.88rem;
  padding: 0.22rem 0;
}

/* ===== 车站结构页 ===== */
.zone-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}
.zone {
  border-top: 4px solid var(--accent);
}
.zone h3 { margin: 0.2rem 0 0.2rem; }
.sect-logo {
  width: 1.5em;
  height: 1.5em;
  vertical-align: -0.32em;
  margin-right: 0.4em;
}
.zone .zone-sub { color: var(--text-dim); font-size: 0.85rem; margin: 0 0 0.8rem; }
.zone ul { padding-left: 1.2rem; margin: 0.4rem 0; }
.zone li { margin: 0.25rem 0; }
.zone .line-wrap { margin: 0.5rem 0 0.8rem; }

.exit-list { columns: 2; column-gap: 2rem; padding-left: 1.2rem; }
.exit-list li { break-inside: avoid; margin: 0.25rem 0; font-size: 0.92rem; }
@media (max-width: 640px) { .exit-list { columns: 1; } }

.connections li { margin: 0.45rem 0; }

/* 楼层剖面示意 */
.levels { margin-top: 1rem; }
.level-row {
  display: flex;
  align-items: stretch;
  gap: 0.8rem;
  border-bottom: 1px dashed var(--border);
  padding: 0.55rem 0;
}
.level-row:last-child { border-bottom: none; }
.level-tag {
  flex: none;
  width: 4.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--text-dim);
  background: var(--bg);
  border-radius: 8px;
}
.level-body { flex: 1; }
.level-body .line-wrap { display: inline-flex; margin-left: 0.4rem; vertical-align: middle; }
.level-name { font-weight: 600; }
.level-desc { color: var(--text-dim); font-size: 0.88rem; }