/* ========== 设计令牌（暗色主题） ========== */
:root {
  --bg-app: #0d1117;
  --bg-card: #161b22;
  --bg-card-hover: #1c232e;
  --bg-input: #0d1117;
  --border: #2d333b;
  --border-light: #21262d;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --accent: #4e8cff;
  --accent-teal: #00d4a8;
  --accent-orange: #ffa94d;
  --accent-purple: #b197fc;
  --accent-pink: #ff6b9d;
  --up: #3fb950;
  --down: #f85149;
  --shadow: 0 1px 3px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.2);
  --radius: 12px;
  --radius-sm: 8px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  font-family: var(--font);
  background: var(--bg-app);
  color: var(--text-primary);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ========== 顶部导航 ========== */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 28px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
}
.topbar-left { display: flex; align-items: center; gap: 14px; }
.topbar-logo {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: .5px;
}
.topbar-logo span { color: var(--accent); }
.topbar-sub {
  font-size: 12px;
  color: var(--text-muted);
  padding-left: 14px;
  border-left: 1px solid var(--border);
}
.topbar-right { display: flex; align-items: center; gap: 12px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: 13px;
  cursor: pointer;
  transition: all .15s;
  font-family: inherit;
}
.btn:hover { background: var(--bg-card-hover); border-color: var(--text-muted); }
.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn-primary:hover { background: #3a7bf0; }
.btn-danger {
  background: transparent;
  border-color: var(--down);
  color: var(--down);
}
.btn-danger:hover { background: rgba(248,81,73,.1); }
.btn-sm { padding: 5px 10px; font-size: 12px; }

/* ========== 主体容器 ========== */
.container {
  max-width: 1480px;
  margin: 0 auto;
  padding: 24px 28px 48px;
}

/* ========== 指标卡 ========== */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}
.metric-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 20px;
  position: relative;
  overflow: hidden;
  transition: transform .15s, border-color .15s;
}
.metric-card:hover {
  transform: translateY(-2px);
  border-color: var(--border);
}
.metric-card::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  background: var(--metric-color, var(--accent));
}
.metric-label {
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
}
.metric-value {
  font-size: 28px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: -.5px;
}
.metric-unit {
  font-size: 13px;
  font-weight: 400;
  color: var(--text-muted);
  margin-left: 3px;
}
.metric-change {
  margin-top: 8px;
  font-size: 12px;
  display: flex;
  align-items: center;
  gap: 4px;
}
.metric-change.up { color: var(--up); }
.metric-change.down { color: var(--down); }
.metric-change.flat { color: var(--text-muted); }
.metric-change .vs { color: var(--text-muted); margin-left: 4px; }

/* ========== 图表网格 ========== */
.charts-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 16px;
  margin-bottom: 24px;
}
.charts-grid.two { grid-template-columns: 1fr 1fr; }
.chart-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 20px;
}
.chart-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}
.chart-title {
  font-size: 15px;
  font-weight: 600;
}
.chart-subtitle {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}
.chart-body {
  position: relative;
  height: 300px;
}
.chart-body.sm { height: 260px; }

/* ========== 表格 ========== */
.table-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  overflow: hidden;
}
.table-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-light);
  flex-wrap: wrap;
  gap: 12px;
}
.table-toolbar-left { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.table-toolbar-right { display: flex; align-items: center; gap: 10px; }
.table-wrap { overflow-x: auto; }
table.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}
.data-table th {
  text-align: left;
  padding: 12px 16px;
  color: var(--text-secondary);
  font-weight: 500;
  background: rgba(255,255,255,.02);
  border-bottom: 1px solid var(--border-light);
  white-space: nowrap;
  position: sticky;
  top: 0;
}
.data-table td {
  padding: 11px 16px;
  border-bottom: 1px solid var(--border-light);
  font-variant-numeric: tabular-nums;
}
.data-table tbody tr:hover { background: rgba(255,255,255,.025); }
.data-table tbody tr:last-child td { border-bottom: none; }
.data-table .num { text-align: right; }
.data-table .actions { display: flex; gap: 8px; }
.data-table .tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 500;
}
.table-footer {
  padding: 12px 20px;
  color: var(--text-muted);
  font-size: 12px;
  border-top: 1px solid var(--border-light);
}

/* ========== 筛选/输入控件 ========== */
.input, .select {
  padding: 8px 12px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 13px;
  font-family: inherit;
  outline: none;
  transition: border-color .15s;
}
.input:focus, .select:focus { border-color: var(--accent); }
.input::placeholder { color: var(--text-muted); }

/* ========== 模态框 ========== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.6);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  backdrop-filter: blur(4px);
}
.modal-overlay.show { display: flex; }
.modal {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  width: 90%;
  max-width: 480px;
  box-shadow: var(--shadow);
}
.modal-title {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 20px;
}
.form-group { margin-bottom: 16px; }
.form-label {
  display: block;
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 6px;
}
.form-group .input, .form-group .select { width: 100%; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 24px;
}

/* ========== Toast ========== */
.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 20px;
  font-size: 13px;
  box-shadow: var(--shadow);
  z-index: 2000;
  opacity: 0;
  transition: all .3s;
}
.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}
.toast.success { border-color: var(--up); }
.toast.error { border-color: var(--down); }

/* ========== 空状态 ========== */
.empty {
  text-align: center;
  padding: 48px 20px;
  color: var(--text-muted);
}
.empty-icon { font-size: 40px; margin-bottom: 12px; }

/* ========== 响应式 ========== */
@media (max-width: 1200px) {
  .metrics-grid { grid-template-columns: repeat(3, 1fr); }
  .charts-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .metrics-grid { grid-template-columns: repeat(2, 1fr); }
  .charts-grid.two { grid-template-columns: 1fr; }
  .container { padding: 16px; }
  .topbar { padding: 12px 16px; }
  .topbar-sub { display: none; }
}

/* ========== 滚动条 ========== */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }