:root {
  --green-50: #f0fdf4;
  --green-100: #dcfce7;
  --green-200: #bbf7d0;
  --green-400: #4ade80;
  --green-500: #22c55e;
  --green-600: #16a34a;
  --green-700: #15803d;
  --green-800: #166534;
  --red-400: #f87171;
  --red-500: #ef4444;
  --amber-400: #fbbf24;
  --amber-500: #f59e0b;
  --slate-50: #f8fafc;
  --slate-100: #f1f5f9;
  --slate-200: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-400: #94a3b8;
  --slate-500: #64748b;
  --slate-600: #475569;
  --slate-700: #334155;
  --slate-800: #1e293b;
  --slate-900: #0f172a;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--slate-50);
  color: var(--slate-800);
  line-height: 1.6;
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--slate-800) 0%, var(--slate-900) 100%);
  color: white;
  padding: 48px 24px;
  text-align: center;
}
.hero h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}
.hero p {
  color: var(--slate-400);
  font-size: 0.95rem;
}

/* Stat Cards */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  padding: 24px;
  max-width: 1200px;
  margin: -20px auto 0;
  position: relative;
  z-index: 1;
}
.stat-card {
  background: white;
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow-md);
  text-align: center;
}
.stat-card .stat-value {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--slate-900);
  line-height: 1.2;
}
.stat-card .stat-label {
  font-size: 0.8rem;
  color: var(--slate-500);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: 4px;
}

/* COE Banner */
.coe-banner {
  display: flex;
  justify-content: center;
  gap: 32px;
  padding: 16px 24px;
  background: var(--green-50);
  border-bottom: 1px solid var(--green-100);
}
.coe-banner .coe-item {
  text-align: center;
}
.coe-banner .coe-cat {
  font-size: 0.75rem;
  color: var(--slate-500);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.coe-banner .coe-val {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--green-700);
}

/* Content Area */
.content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 24px;
}
.section-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--slate-900);
  margin-bottom: 20px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--slate-200);
}

/* Chart Container */
.chart-container {
  background: white;
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  margin-bottom: 32px;
}
.chart-container svg {
  display: block;
  margin: 0 auto;
}

/* Two-column layout */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-bottom: 32px;
}
@media (max-width: 768px) {
  .grid-2 { grid-template-columns: 1fr; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
}

/* Listing Detail Page */
.detail-header {
  background: white;
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  margin-bottom: 24px;
}
.detail-header .car-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--slate-900);
}
.detail-header .car-brand {
  display: inline-block;
  background: var(--slate-100);
  color: var(--slate-600);
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 0.8rem;
  margin-bottom: 8px;
}
.detail-header .car-price {
  font-size: 2rem;
  font-weight: 700;
  color: var(--green-700);
  margin-top: 8px;
}
.detail-header .car-depr {
  font-size: 0.9rem;
  color: var(--slate-500);
}
.detail-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--slate-200);
}
.detail-meta .meta-item {
  text-align: center;
}
.detail-meta .meta-val {
  font-weight: 600;
  font-size: 1rem;
  color: var(--slate-800);
}
.detail-meta .meta-lbl {
  font-size: 0.7rem;
  color: var(--slate-400);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Score bar */
.score-bar-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}
.score-bar-label {
  width: 160px;
  font-size: 0.8rem;
  color: var(--slate-600);
  text-align: right;
  flex-shrink: 0;
}
.score-bar-track {
  flex: 1;
  height: 22px;
  background: var(--slate-100);
  border-radius: 6px;
  overflow: hidden;
  position: relative;
}
.score-bar-fill {
  height: 100%;
  border-radius: 6px;
  background: linear-gradient(90deg, var(--amber-400), var(--green-400), var(--green-600));
  transition: width 0.3s ease;
}
.score-bar-val {
  width: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--slate-700);
  flex-shrink: 0;
}

/* Composite score badge */
.score-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 20px;
  font-weight: 700;
  font-size: 0.95rem;
}
.score-badge.high {
  background: var(--green-100);
  color: var(--green-700);
}
.score-badge.mid {
  background: #fef3c7;
  color: #92400e;
}
.score-badge.low {
  background: #fee2e2;
  color: #991b1b;
}

/* Nav */
.nav-links {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.nav-links a {
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
  text-decoration: none;
  color: var(--slate-600);
  background: var(--slate-100);
  transition: all 0.15s;
}
.nav-links a:hover {
  background: var(--slate-200);
  color: var(--slate-900);
}
.nav-links a.active {
  background: var(--slate-800);
  color: white;
}

/* Sortable table */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}
.data-table th {
  text-align: left;
  padding: 10px 12px;
  background: var(--slate-100);
  color: var(--slate-600);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
}
.data-table th:hover { color: var(--slate-900); }
.data-table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--slate-100);
  vertical-align: middle;
}
.data-table tr:hover td { background: var(--slate-50); }
.data-table .rank-col {
  width: 40px;
  text-align: center;
  font-weight: 700;
  font-size: 1rem;
}
.data-table .price-col {
  font-weight: 600;
  white-space: nowrap;
}
.data-table .score-col {
  font-weight: 600;
}
.data-table a {
  color: var(--slate-800);
  text-decoration: none;
}
.data-table a:hover {
  color: var(--green-700);
  text-decoration: underline;
}

/* Back link */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  color: var(--slate-500);
  text-decoration: none;
  margin-bottom: 16px;
}
.back-link:hover { color: var(--slate-800); }

/* Responsive radar chart container */
.radar-container {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 360px;
}
.radar-container svg {
  max-width: 100%;
  height: auto;
}

/* Footer */
footer {
  text-align: center;
  padding: 32px 24px;
  color: var(--slate-400);
  font-size: 0.8rem;
  border-top: 1px solid var(--slate-200);
  margin-top: 48px;
}