:root {
  --primary: #4f7cff;
  --primary-soft: rgba(79, 124, 255, 0.12);
  --accent: #22c4a3;
  --warn: #f5a524;
  --danger: #ef476f;
  --bg: #f5f7fb;
  --bg-card: #ffffff;
  --text: #1a2238;
  --text-muted: #6b7390;
  --border: #e6e9f2;
  --shadow: 0 4px 18px rgba(20, 30, 70, 0.06);
  --radius: 14px;
  --radius-sm: 8px;
  --heat-0: #eef1f8;
  --heat-1: #cfe0ff;
  --heat-2: #95b8ff;
  --heat-3: #6f97ff;
  --heat-4: #4f7cff;
}

[data-theme="dark"] {
  --primary: #7ea2ff;
  --primary-soft: rgba(126, 162, 255, 0.18);
  --accent: #4ad8b9;
  --bg: #0f1424;
  --bg-card: #161c30;
  --text: #e9ecf6;
  --text-muted: #9aa3c0;
  --border: #232a44;
  --shadow: 0 4px 18px rgba(0, 0, 0, 0.4);
  --heat-0: #1a2138;
  --heat-1: #28365e;
  --heat-2: #3d5598;
  --heat-3: #5b7ed1;
  --heat-4: #7ea2ff;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  font-size: 15px;
  line-height: 1.5;
}

.site-header {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(8px);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.brand h1 {
  margin: 0;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.2px;
}

.brand-tag {
  display: inline-block;
  margin-left: 8px;
  padding: 2px 8px;
  font-size: 11px;
  font-weight: 600;
  background: var(--primary-soft);
  color: var(--primary);
  border-radius: 999px;
  vertical-align: middle;
}

.subtitle {
  margin: 4px 0 0;
  color: var(--text-muted);
  font-size: 13px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.updated {
  color: var(--text-muted);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

.week-select {
  padding: 7px 12px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  max-width: 240px;
  transition: border-color 0.1s ease;
}

.week-select:hover { border-color: var(--primary); }
.week-select:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.week-select[disabled] { opacity: 0.6; cursor: not-allowed; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  font-size: 13px;
  font-weight: 600;
  color: #fff;
  background: var(--primary);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: transform 0.1s ease, box-shadow 0.1s ease, opacity 0.1s ease;
}

.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow); }
.btn:active { transform: translateY(0); }
.btn:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
.btn[disabled] { opacity: 0.6; cursor: not-allowed; }

.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-icon {
  display: inline-block;
  font-size: 15px;
  line-height: 1;
}

.btn.refreshing .btn-icon {
  animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}

.card-header { margin-bottom: 14px; }
.card-header h2 { margin: 0; font-size: 16px; font-weight: 700; }
.card-sub { margin: 4px 0 0; color: var(--text-muted); font-size: 13px; }

.overview {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  position: relative;
  overflow: hidden;
}

.stat::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 4px; height: 100%;
  background: var(--primary);
}

.stat[data-key="total_users"]::before { background: var(--accent); }
.stat[data-key="total_km"]::before { background: var(--warn); }
.stat[data-key="makeup_count"]::before { background: var(--danger); }

.stat-label { color: var(--text-muted); font-size: 13px; font-weight: 500; }
.stat-value { font-size: 32px; font-weight: 700; font-variant-numeric: tabular-nums; }
.stat-value .unit { font-size: 16px; font-weight: 500; color: var(--text-muted); margin-left: 2px; }
.stat-trend { color: var(--text-muted); font-size: 12px; }

.grid-2 {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 20px;
}

@media (max-width: 900px) {
  .grid-2 { grid-template-columns: 1fr; }
}

.chart-wrap {
  position: relative;
  height: 280px;
}

.heatmap {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 8px;
  margin-top: 8px;
}

.heat-cell {
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-sm);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  color: var(--text);
  position: relative;
  border: 1px solid var(--border);
  transition: transform 0.15s ease;
}

.heat-cell:hover { transform: scale(1.04); z-index: 1; }
.heat-cell .heat-day { font-size: 10px; color: var(--text-muted); }
.heat-cell .heat-num { font-size: 14px; font-weight: 700; margin-top: 2px; }

.heat-cell[data-level="0"] { background: var(--heat-0); }
.heat-cell[data-level="1"] { background: var(--heat-1); }
.heat-cell[data-level="2"] { background: var(--heat-2); }
.heat-cell[data-level="3"] { background: var(--heat-3); color: #fff; }
.heat-cell[data-level="3"] .heat-day { color: rgba(255,255,255,0.85); }
.heat-cell[data-level="4"] { background: var(--heat-4); color: #fff; }
.heat-cell[data-level="4"] .heat-day { color: rgba(255,255,255,0.85); }

.heatmap-legend {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 14px;
  font-size: 12px;
  color: var(--text-muted);
}

.lg-cell {
  width: 16px;
  height: 16px;
  border-radius: 4px;
  display: inline-block;
  border: 1px solid var(--border);
}

.lg-cell[data-level="0"] { background: var(--heat-0); }
.lg-cell[data-level="1"] { background: var(--heat-1); }
.lg-cell[data-level="2"] { background: var(--heat-2); }
.lg-cell[data-level="3"] { background: var(--heat-3); }
.lg-cell[data-level="4"] { background: var(--heat-4); }

.table-wrap {
  overflow-x: auto;
}

table.ranking {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

table.ranking th,
table.ranking td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

table.ranking th {
  font-weight: 600;
  font-size: 12px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

table.ranking tr:last-child td { border-bottom: none; }
table.ranking tbody tr { transition: background 0.1s ease; }
table.ranking tbody tr:hover { background: var(--primary-soft); }

.rank-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 26px;
  height: 26px;
  padding: 0 8px;
  border-radius: 999px;
  background: var(--primary-soft);
  color: var(--primary);
  font-weight: 700;
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}

.rank-badge.rank-1 { background: linear-gradient(135deg, #ffd76e, #f5a524); color: #fff; }
.rank-badge.rank-2 { background: linear-gradient(135deg, #c8d3e6, #97a3bd); color: #fff; }
.rank-badge.rank-3 { background: linear-gradient(135deg, #ffb38a, #d97149); color: #fff; }

.km, .points {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
}

.adjustment.pos { color: var(--accent); }
.adjustment.neg { color: var(--danger); }
.adjustment.zero { color: var(--text-muted); }

.sparkline {
  display: inline-flex;
  align-items: flex-end;
  gap: 2px;
  height: 28px;
}

.sparkline .bar {
  width: 6px;
  background: var(--primary);
  border-radius: 2px 2px 0 0;
  min-height: 2px;
  opacity: 0.85;
}

.sparkline .bar.empty { background: var(--border); opacity: 1; }

.note-cell {
  color: var(--text-muted);
  font-size: 13px;
  max-width: 280px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.error-state, .loading-state {
  max-width: 600px;
  margin: 80px auto;
  padding: 0 24px;
  text-align: center;
}

.error-card { padding: 32px; }
.error-card h2 { margin: 0 0 8px; color: var(--danger); }
.hint { color: var(--text-muted); font-size: 14px; }
.hint-code {
  display: inline-block;
  margin-top: 8px;
  padding: 8px 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 13px;
}

.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  margin: 0 auto 16px;
  animation: spin 0.8s linear infinite;
}

.site-footer {
  max-width: 1200px;
  margin: 24px auto 32px;
  padding: 0 24px;
  color: var(--text-muted);
  font-size: 12px;
  text-align: center;
}

.site-footer code {
  background: var(--bg-card);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--border);
}

@media (max-width: 600px) {
  .header-inner { padding: 12px 16px; }
  .container { padding: 16px; gap: 16px; }
  .card { padding: 16px; }
  .stat-value { font-size: 26px; }
  .chart-wrap { height: 220px; }
  .brand h1 { font-size: 17px; }
  .brand-tag { display: none; }
}