/* ═══════════════════════════════════════════════
   12306 智能查票系统 — 样式
   ═══════════════════════════════════════════════ */

:root {
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --success: #059669;
  --danger: #dc2626;
  --warning: #d97706;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-700: #374151;
  --gray-900: #111827;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Microsoft YaHei", sans-serif;
  background: var(--gray-50);
  color: var(--gray-900);
  min-height: 100vh;
}

/* ── 头部 ── */
.header {
  background: linear-gradient(135deg, var(--primary), #1d4ed8);
  color: #fff;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header h1 { font-size: 20px; font-weight: 700; }
.header .sub { font-size: 13px; opacity: 0.8; margin-left: auto; }

/* ── Tab 导航 ── */
.tab-bar {
  display: flex;
  background: #fff;
  border-bottom: 2px solid var(--gray-200);
  padding: 0 16px;
  position: sticky;
  top: 60px;
  z-index: 90;
}
.tab-btn {
  padding: 12px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-500);
  background: none;
  border: none;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all 0.15s;
}
.tab-btn:hover { color: var(--gray-700); }
.tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
}

/* ── 主内容区 ── */
.main {
  max-width: 1000px;
  margin: 0 auto;
  padding: 16px;
}
.tab-content { display: none; }
.tab-content.active { display: block; }

/* ── 查询表单 ── */
.form-row {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.form-group { display: flex; align-items: center; gap: 4px; }
.form-group label {
  font-size: 13px;
  font-weight: 500;
  color: var(--gray-700);
  white-space: nowrap;
}
input, select {
  padding: 8px 12px;
  border: 1px solid var(--gray-300);
  border-radius: 6px;
  font-size: 14px;
  outline: none;
  transition: border-color 0.15s;
}
input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(59,130,246,0.1); }
input[type="text"] { width: 110px; }
input[type="date"] { width: 140px; }
input.small { width: 70px; }

/* ── 按钮 ── */
.btn {
  padding: 8px 18px;
  border: none;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { background: #047857; }
.btn-warning { background: #6366f1; color: #fff; }
.btn-warning:hover { background: #4f46e5; }
.btn-sm { padding: 4px 12px; font-size: 12px; }
.btn-outline {
  background: #fff; color: var(--primary); border: 1px solid var(--primary);
}
.btn-outline:hover { background: #eff6ff; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ── 车站搜索弹窗 ── */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.3);
  display: flex; align-items: center; justify-content: center;
  z-index: 200;
}
.modal {
  background: #fff; border-radius: 12px; width: 380px;
  max-height: 500px; box-shadow: 0 8px 30px rgba(0,0,0,0.15);
  overflow: hidden;
}
.modal-header {
  padding: 12px 16px; border-bottom: 1px solid var(--gray-200);
  display: flex; align-items: center; gap: 8px;
}
.modal-header input { flex: 1; }
.modal-body { max-height: 400px; overflow-y: auto; }
.modal-close {
  background: none; border: none; font-size: 20px; cursor: pointer;
  color: var(--gray-400); padding: 4px;
}
.station-item {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 16px; cursor: pointer; transition: background 0.1s;
}
.station-item:hover { background: var(--gray-100); }
.station-item .s-name { font-weight: 600; color: var(--gray-900); min-width: 70px; }
.station-item .s-code { color: var(--primary); font-size: 12px; min-width: 40px; }
.station-item .s-pinyin { color: var(--gray-400); font-size: 12px; }

/* ── 车次卡片 ── */
.train-card {
  background: #fff; border: 1px solid var(--gray-200);
  border-radius: var(--radius); padding: 12px 16px;
  margin-bottom: 8px; box-shadow: var(--shadow);
  transition: box-shadow 0.15s;
}
.train-card:hover { box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.train-card .top {
  display: flex; align-items: center; gap: 12px; margin-bottom: 8px;
  flex-wrap: wrap;
}
.train-code {
  font-size: 16px; font-weight: 700; color: var(--primary);
}
.train-route { font-size: 14px; color: var(--gray-900); }
.train-time { font-size: 13px; color: var(--gray-500); margin-left: auto; }
.train-seats {
  display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 6px;
}
.seat-badge {
  font-size: 12px; padding: 2px 8px; border-radius: 4px;
  font-weight: 500;
}
.seat-badge.has { background: #d1fae5; color: #065f46; }
.seat-badge.none { background: #fee2e2; color: #991b1b; }
.seat-badge.num { background: #dbeafe; color: #1e40af; }
.seat-badge.empty { background: var(--gray-100); color: var(--gray-400); }
.train-card .bottom {
  display: flex; justify-content: space-between; align-items: center;
}
.train-status { font-size: 12px; color: var(--gray-500); }

/* ── 方案比较卡片 ── */
.compare-card {
  border: 1px solid var(--gray-200); border-radius: var(--radius);
  padding: 14px 18px; margin-bottom: 10px; box-shadow: var(--shadow);
  background: #fff;
}
.compare-card.top1 {
  border-color: #fbbf24; background: #fffbeb;
}
.compare-card .top { display: flex; align-items: center; gap: 10px; margin-bottom: 6px; }
.compare-card .rank-badge {
  font-weight: 700; font-size: 14px; padding: 2px 10px;
  border-radius: 6px; background: var(--gray-100);
}
.compare-card.top1 .rank-badge { background: #fef3c7; color: #92400e; }
.compare-card .score { font-weight: 600; font-size: 15px; color: var(--primary); }
.compare-card.top1 .score { color: #92400e; }
.compare-card .rec-tag {
  font-size: 11px; background: #fef3c7; color: #92400e;
  padding: 1px 6px; border-radius: 4px; margin-left: 6px;
}
.compare-card .comment { font-size: 14px; color: var(--gray-700); margin-bottom: 4px; }
.compare-card .detail { font-size: 13px; color: var(--gray-500); line-height: 1.6; }

/* ── 权重滑块区 ── */
.slider-grid {
  background: #fff; border: 1px solid var(--gray-200);
  border-radius: var(--radius); padding: 12px 16px; margin-bottom: 12px;
}
.slider-grid h3 { font-size: 14px; color: var(--gray-700); margin-bottom: 8px; }
.slider-row {
  display: flex; align-items: center; gap: 10px; margin-bottom: 6px;
}
.slider-row label { font-size: 13px; color: var(--gray-700); min-width: 70px; }
.slider-row input[type="range"] { flex: 1; }
.slider-row .val { font-size: 13px; color: var(--primary); min-width: 30px; text-align: right; }

/* ── 中转方案 ── */
.transfer-card {
  background: #fff; border: 1px solid var(--gray-200);
  border-radius: var(--radius); padding: 12px 16px; margin-bottom: 8px;
  box-shadow: var(--shadow);
}
.transfer-card .title { font-weight: 600; font-size: 14px; margin-bottom: 4px; }
.transfer-card .meta { font-size: 12px; color: var(--gray-500); margin-bottom: 6px; }
.transfer-segment {
  background: var(--gray-50); border-radius: 6px; padding: 6px 10px;
  margin-bottom: 4px; font-size: 13px;
}

/* ── 票价表 ── */
.price-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.price-table th {
  background: var(--gray-100); padding: 8px 12px; text-align: left;
  font-weight: 600; color: var(--gray-700); border-bottom: 2px solid var(--gray-200);
}
.price-table td { padding: 8px 12px; border-bottom: 1px solid var(--gray-100); }
.price-table tr:hover td { background: var(--gray-50); }

/* ── 加载和状态 ── */
.status-bar {
  font-size: 13px; color: var(--gray-500); margin-bottom: 8px;
  min-height: 20px; display: flex; align-items: center; gap: 8px;
}
.status-bar.error { color: var(--danger); }
.status-bar.success { color: var(--success); }
.spinner {
  display: inline-block; width: 16px; height: 16px;
  border: 2px solid var(--gray-200); border-top-color: var(--primary);
  border-radius: 50%; animation: spin 0.6s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.empty-state {
  text-align: center; padding: 60px 20px; color: var(--gray-400);
  font-size: 15px;
}

/* ── 接力组合编辑器 ── */
.leg-card {
  background: #fff; border: 1px solid var(--gray-200);
  border-radius: var(--radius); padding: 12px 16px; margin-bottom: 8px;
  box-shadow: var(--shadow);
}
.leg-card .leg-header {
  display: flex; align-items: center; gap: 8px; margin-bottom: 8px;
}
.leg-card .leg-number {
  font-weight: 700; font-size: 13px; color: var(--primary);
  background: #eff6ff; padding: 2px 10px; border-radius: 4px;
}
.leg-card .leg-remove {
  color: var(--danger); font-size: 12px; cursor: pointer;
  background: none; border: none; margin-left: auto;
}
.leg-card .leg-remove:hover { text-decoration: underline; }
.leg-card .leg-form { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.interval-row {
  margin: 4px 0 8px 24px; display: flex; align-items: center; gap: 8px;
  font-size: 13px; color: var(--gray-500);
}
.interval-row input { width: 60px; }

/* 接力组合结果卡片 */
.journey-card {
  background: #fff; border: 1px solid var(--gray-200);
  border-radius: var(--radius); padding: 14px 16px; margin-bottom: 10px;
  box-shadow: var(--shadow);
}
.journey-card.top1 { border-color: #fbbf24; background: #fffbeb; }
.journey-card .journey-header {
  display: flex; align-items: center; gap: 10px; margin-bottom: 8px;
}
.journey-card .journey-rank {
  font-weight: 700; padding: 2px 10px; border-radius: 6px;
  background: var(--gray-100); font-size: 14px;
}
.journey-card.top1 .journey-rank { background: #fef3c7; color: #92400e; }
.journey-card .journey-meta { font-size: 13px; color: var(--gray-500); }
.journey-leg {
  background: var(--gray-50); border-radius: 6px; padding: 8px 12px;
  margin-bottom: 6px;
}
.journey-leg .jl-top {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
}
.journey-leg .jl-code { font-weight: 600; color: var(--primary); }
.journey-leg .jl-route { font-size: 13px; }
.journey-leg .jl-seats { display: flex; gap: 4px; flex-wrap: wrap; margin-top: 4px; }
.journey-arrow { text-align: center; font-size: 18px; color: var(--gray-400); line-height: 1; }

/* ── 响应式 ── */
@media (max-width: 640px) {
  .form-row { flex-direction: column; align-items: stretch; }
  .form-group { flex-wrap: wrap; }
  input[type="text"] { width: 100%; }
}