/* ============================================
   FuelSignal — Design System
   ============================================ */

/* --- Custom Properties --- */
:root {
  /* Backgrounds */
  --bg-primary: #0a0a0a;
  --bg-elevated: #111111;
  --bg-surface: #1a1a1a;
  --bg-hover: #151515;

  /* Borders */
  --border-subtle: #1a1a1a;
  --border-default: #222222;
  --border-strong: #333333;
  --border-hover: #444444;

  /* Text */
  --text-primary: #e0e0e0;
  --text-secondary: #999999;
  --text-tertiary: #666666;
  --text-muted: #444444;
  --text-bright: #f0f0f0;

  /* Semantic */
  --accent: #f59e0b;
  --accent-dim: rgba(245, 158, 11, 0.12);
  --danger: #ef4444;
  --danger-dim: rgba(239, 68, 68, 0.1);
  --success: #22c55e;
  --success-dim: rgba(34, 197, 94, 0.08);
  --info: #60a5fa;
  --info-dim: rgba(96, 165, 250, 0.08);
  --warning: #f97316;

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --radius: 6px;
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --shadow-card: 0 1px 3px rgba(0,0,0,0.3), 0 1px 2px rgba(0,0,0,0.2);
  --shadow-hover: 0 4px 12px rgba(0,0,0,0.4), 0 2px 4px rgba(0,0,0,0.3);
}

/* --- Reset & Base --- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: var(--font-family);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--info); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: #93bbfc; text-decoration: underline; }

/* --- Navigation --- */
.nav {
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border-default);
  padding: 0 1.5rem;
  position: sticky;
  top: 0;
  z-index: 100;
}
.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 2rem;
  height: 3.25rem;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.5px;
  text-decoration: none;
  flex-shrink: 0;
}
.nav-brand:hover { color: var(--accent); text-decoration: none; }
.nav-logo { height: 28px; width: auto; }
.nav-links {
  display: flex;
  gap: 0.25rem;
  align-items: center;
}
.nav-links a {
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius);
  transition: color var(--transition-fast), background var(--transition-fast);
  text-decoration: none;
}
.nav-links a:hover {
  color: var(--text-primary);
  background: var(--bg-surface);
  text-decoration: none;
}
.nav-links a.active {
  color: var(--text-bright);
  background: var(--accent-dim);
  box-shadow: inset 0 -2px 0 var(--accent);
}

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  margin-left: auto;
}
.nav-toggle-bar {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text-secondary);
  border-radius: 1px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* --- Layout --- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.5rem;
}
.page-header {
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border-subtle);
}
.page-header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-bright);
  letter-spacing: -0.025em;
}
.page-header .subtitle {
  color: var(--text-tertiary);
  font-size: 0.875rem;
  margin-top: 0.25rem;
}

/* --- Filters --- */
.filters {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  align-items: center;
}
.filter-btn {
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  color: var(--text-secondary);
  padding: 0.375rem 0.75rem;
  font-size: 0.8rem;
  cursor: pointer;
  font-family: inherit;
  border-radius: var(--radius);
  transition: border-color var(--transition-fast), color var(--transition-fast), background var(--transition-fast);
  text-decoration: none;
  display: inline-block;
}
.filter-btn:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
  background: var(--bg-hover);
  text-decoration: none;
}
.filter-btn.active {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}
select.filter-select {
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  color: var(--text-secondary);
  padding: 0.375rem 0.5rem;
  font-size: 0.8rem;
  font-family: inherit;
  border-radius: var(--radius);
  transition: border-color var(--transition-fast);
}
select.filter-select:focus { border-color: var(--accent); outline: none; }

/* --- Stat Cards --- */
.stats {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}
.stat-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  padding: 1rem 1.25rem;
  flex: 1;
  min-width: 120px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.stat-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--border-default);
}
.stat-card:hover { border-color: var(--border-strong); }
.stat-card .stat-num {
  font-size: 1.75rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.stat-card .stat-label {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.stat-risk::before { background: linear-gradient(90deg, var(--danger), transparent); }
.stat-risk .stat-num { color: var(--danger); }
.stat-opp::before { background: linear-gradient(90deg, var(--success), transparent); }
.stat-opp .stat-num { color: var(--success); }
.stat-watch::before { background: linear-gradient(90deg, var(--accent), transparent); }
.stat-watch .stat-num { color: var(--accent); }
.stat-total::before { background: linear-gradient(90deg, var(--info), transparent); }
.stat-total .stat-num { color: var(--info); }
.stat-card--featured {
  flex: none;
  min-width: 250px;
}

/* --- Signal Cards --- */
.signal-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  padding: 1rem 1.25rem;
  margin-bottom: 0.75rem;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}
.signal-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-hover);
  transform: translateY(-1px);
}
.signal-score {
  font-size: 1.5rem;
  font-weight: 800;
  min-width: 2.5rem;
  text-align: center;
  line-height: 1;
  padding-top: 0.15rem;
  font-variant-numeric: tabular-nums;
}
.score-5 { color: var(--danger); }
.score-4 { color: var(--warning); }
.score-3 { color: var(--accent); }
.score-2 { color: var(--text-tertiary); }
.score-1 { color: var(--text-muted); }
.signal-body { flex: 1; min-width: 0; }
.signal-meta {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 0.375rem;
  flex-wrap: wrap;
}
.label-tag {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-radius: 3px;
}
.label-Risk { background: var(--danger-dim); color: var(--danger); border: 1px solid rgba(239,68,68,0.25); }
.label-Opportunity { background: var(--success-dim); color: var(--success); border: 1px solid rgba(34,197,94,0.2); }
.label-Watch { background: var(--accent-dim); color: var(--accent); border: 1px solid rgba(245,158,11,0.2); }
.signal-company { font-size: 0.75rem; color: var(--text-tertiary); }
.signal-source { font-size: 0.7rem; color: var(--text-muted); text-transform: uppercase; }
.signal-title { font-size: 0.9rem; color: #d0d0d0; margin-bottom: 0.25rem; }
.signal-rationale { font-size: 0.825rem; color: #888; }
.signal-time { font-size: 0.7rem; color: var(--text-muted); margin-top: 0.375rem; }

/* --- Event Rows --- */
.event-row {
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  padding: 0.75rem 1rem;
  margin-bottom: 0.5rem;
  display: flex;
  gap: 1rem;
  align-items: center;
  border-radius: var(--radius);
  transition: border-color var(--transition-fast), background var(--transition-fast);
}
.event-row:hover {
  border-color: var(--border-strong);
  background: var(--bg-hover);
}
.event-source-tag {
  font-size: 0.65rem;
  font-weight: 600;
  padding: 0.15rem 0.4rem;
  text-transform: uppercase;
  background: var(--bg-surface);
  color: var(--text-tertiary);
  border: 1px solid var(--border-strong);
  min-width: 50px;
  text-align: center;
  border-radius: 3px;
  flex-shrink: 0;
}
.event-source-tag--compact { min-width: 30px; }
.event-title { font-size: 0.875rem; flex: 1; min-width: 0; }
.event-company { font-size: 0.75rem; color: var(--text-tertiary); min-width: 100px; flex-shrink: 0; }
.event-date { font-size: 0.75rem; color: var(--text-muted); min-width: 80px; text-align: right; flex-shrink: 0; }

/* --- Data Tables --- */
.table-responsive {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius);
}
.data-table {
  width: 100%;
  border-collapse: collapse;
}
.data-table th {
  text-align: left;
  font-size: 0.7rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 0.625rem 0.75rem;
  border-bottom: 2px solid var(--border-strong);
  font-weight: 600;
  white-space: nowrap;
}
.data-table th.num { text-align: right; }
.data-table th.sortable {
  cursor: pointer;
  user-select: none;
  transition: color var(--transition-fast);
}
.data-table th.sortable:hover {
  color: var(--text-primary);
}
.data-table th.sort-asc,
.data-table th.sort-desc {
  color: var(--accent);
}
.sort-arrow {
  font-size: 0.6rem;
  opacity: 0.7;
}
.data-table td {
  padding: 0.625rem 0.75rem;
  font-size: 0.85rem;
  border-bottom: 1px solid var(--border-subtle);
  font-variant-numeric: tabular-nums;
}
.data-table td.num { text-align: right; }
.data-table tr { transition: background var(--transition-fast); }
.data-table tr:hover { background: var(--bg-hover); }

/* --- Detail Grid --- */
.detail-grid {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 0.5rem 1rem;
  font-size: 0.875rem;
  margin-bottom: 1.5rem;
}
.detail-label { color: var(--text-tertiary); }
.detail-value { color: #d0d0d0; word-break: break-word; }

/* --- Detail Page Sections --- */
.detail-section {
  margin-bottom: 1.5rem;
}
.detail-section__heading {
  font-size: 0.9rem;
  color: var(--text-tertiary);
  margin-bottom: 0.5rem;
  font-weight: 600;
}
.content-block {
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  padding: 1rem;
  font-size: 0.875rem;
  color: #aaa;
  white-space: pre-wrap;
  border-radius: var(--radius);
  line-height: 1.6;
}
.back-link {
  margin-top: 1.5rem;
}

/* --- Briefs --- */
.brief-section { margin-bottom: 1.5rem; }
.brief-section h3 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.brief-section ul { list-style: none; padding: 0; }
.brief-section li {
  padding: 0.5rem 0;
  padding-left: 1rem;
  position: relative;
  font-size: 0.875rem;
  color: #ccc;
  border-bottom: 1px solid var(--border-subtle);
  line-height: 1.5;
}
.brief-section li::before {
  content: "\2022";
  color: var(--accent);
  position: absolute;
  left: 0;
}
.brief-list-link {
  text-decoration: none;
  display: block;
}
.brief-list-link:hover { text-decoration: none; }
.brief-list-item {
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  padding: 0.75rem 1rem;
  margin-bottom: 0.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-radius: var(--radius);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), transform var(--transition-fast);
}
.brief-list-item:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-hover);
  transform: translateY(-1px);
}
.brief-date { font-weight: 600; color: var(--text-primary); }
.brief-timestamp { color: var(--text-tertiary); font-size: 0.8rem; }

/* --- Pagination --- */
.pagination {
  display: flex;
  gap: 0.5rem;
  margin-top: 1.5rem;
  justify-content: center;
}
.pagination a {
  padding: 0.375rem 0.75rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  color: var(--text-secondary);
  font-size: 0.8rem;
  border-radius: var(--radius);
  transition: border-color var(--transition-fast), color var(--transition-fast);
}
.pagination a:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
  text-decoration: none;
}

/* --- Shared Section Components --- */
.content-section {
  margin-bottom: 2rem;
}
.section-heading {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.75rem;
}

/* --- Market Page --- */
.market-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 0.75rem;
}
.market-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  padding: 0.875rem 1rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.market-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-hover);
}
.market-card__label {
  font-size: 0.75rem;
  color: var(--text-tertiary);
}
.market-card__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}
.market-card__value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}
.market-card__unit {
  font-size: 0.7rem;
  color: var(--text-muted);
}
.market-card__period {
  font-size: 0.7rem;
  color: var(--text-muted);
}

/* Sparkline charts */
.sparkline-wrap {
  position: relative;
  height: 48px;
  margin: 0.5rem 0 0.25rem;
}
.sparkline-wrap canvas {
  width: 100% !important;
  height: 48px !important;
  display: block;
}
.sparkline-change {
  position: absolute;
  top: 2px;
  right: 2px;
  font-size: 0.6rem;
  font-weight: 600;
  padding: 1px 5px;
  border-radius: 3px;
  line-height: 1.4;
  font-variant-numeric: tabular-nums;
}
.sparkline-change--up {
  color: #22c55e;
  background: rgba(34, 197, 94, 0.12);
}
.sparkline-change--down {
  color: #ef4444;
  background: rgba(239, 68, 68, 0.12);
}

/* --- Infrastructure Page --- */
.infra-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.5rem;
}
.infra-grid--wide {
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
}
.infra-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  transition: border-color var(--transition-fast);
}
.infra-card:hover { border-color: var(--border-strong); }
.infra-card__title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--info);
}
.infra-card__name {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
}
.infra-card__stat {
  font-size: 0.8rem;
  color: var(--text-secondary);
}
.infra-card__stat--accent {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}
.infra-card__detail {
  font-size: 0.7rem;
  color: var(--text-tertiary);
}
.epa-penalty {
  font-size: 0.8rem;
  color: var(--danger);
  min-width: 100px;
  text-align: right;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
}
.epa-violations {
  font-size: 0.7rem;
  color: var(--text-tertiary);
  min-width: 90px;
  text-align: right;
  flex-shrink: 0;
}

/* --- Glossary --- */
.glossary {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.8;
}
.glossary__heading {
  font-size: 0.75rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.75rem;
  font-weight: 600;
}
.glossary__category {
  margin-top: 0.75rem;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.glossary p + p {
  margin-top: 0.5rem;
}
.glossary strong {
  color: var(--text-secondary);
}
.glossary__footer {
  margin-top: 1rem;
  color: var(--text-muted);
  font-size: 0.7rem;
}

/* --- Category Tags --- */
.category-tag {
  font-size: 0.65rem;
  font-weight: 600;
  padding: 0.1rem 0.4rem;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  border-radius: 3px;
}
.cat-Regulatory { color: #a78bfa; background: rgba(167,139,250,0.1); border: 1px solid rgba(167,139,250,0.25); }
.cat-Competitive { color: var(--info); background: var(--info-dim); border: 1px solid rgba(96,165,250,0.25); }
.cat-Market { color: var(--accent); background: var(--accent-dim); border: 1px solid rgba(245,158,11,0.25); }
.cat-Operational { color: var(--warning); background: rgba(249,115,22,0.1); border: 1px solid rgba(249,115,22,0.25); }
.cat-Strategic { color: #34d399; background: rgba(52,211,153,0.1); border: 1px solid rgba(52,211,153,0.25); }

/* --- Signal Factor Badges --- */
.signal-factors {
  display: flex;
  gap: 0.375rem;
  margin-top: 0.375rem;
  flex-wrap: wrap;
  align-items: center;
}
.factor-badge {
  font-size: 0.65rem;
  font-weight: 600;
  padding: 0.1rem 0.35rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-default);
  border-radius: 3px;
  color: var(--text-tertiary);
  font-variant-numeric: tabular-nums;
}
.composite-badge {
  font-size: 0.65rem;
  font-weight: 700;
  padding: 0.1rem 0.4rem;
  border-radius: 3px;
  font-variant-numeric: tabular-nums;
}
.composite-high { background: var(--danger-dim); color: var(--danger); border: 1px solid rgba(239,68,68,0.2); }
.composite-mid { background: var(--accent-dim); color: var(--accent); border: 1px solid rgba(245,158,11,0.2); }
.composite-low { background: var(--success-dim); color: var(--success); border: 1px solid rgba(34,197,94,0.2); }
.horizon-badge {
  font-size: 0.6rem;
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  background: var(--bg-surface);
  color: var(--text-muted);
  border: 1px solid var(--border-default);
}
.segment-chip {
  font-size: 0.6rem;
  padding: 0.1rem 0.3rem;
  border-radius: 3px;
  background: var(--bg-surface);
  color: var(--text-tertiary);
  border: 1px solid var(--border-subtle);
}

/* --- Category Stats Row --- */
.stats-categories {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}
.stat-card--cat {
  background: var(--bg-elevated);
  border: 1px solid var(--border-default);
  padding: 0.625rem 0.875rem;
  flex: 1;
  min-width: 100px;
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  transition: border-color var(--transition-fast);
}
.stat-card--cat:hover { border-color: var(--border-strong); }
.stat-card--cat .stat-num {
  font-size: 1.25rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.stat-card--cat .stat-label {
  font-size: 0.65rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.4px;
}
.stat-card--cat .stat-avg {
  font-size: 0.6rem;
  color: var(--text-muted);
  margin-top: 0.125rem;
}

/* --- Risk Matrix --- */
.matrix-page {
  max-width: 900px;
}
.matrix-wrapper {
  display: flex;
  gap: 0.5rem;
  align-items: stretch;
  margin-bottom: 2rem;
}
.matrix-y-axis {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 0 0.25rem;
  width: 1.5rem;
}
.matrix-y-label {
  font-size: 0.6rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  writing-mode: vertical-lr;
  transform: rotate(180deg);
  text-align: center;
}
.matrix-y-num {
  font-size: 0.65rem;
  color: var(--text-tertiary);
  text-align: center;
  font-variant-numeric: tabular-nums;
}
.matrix-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 3px;
  flex: 1;
  max-width: 500px;
}
.matrix-cell {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  position: relative;
}
.matrix-cell:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-hover);
  z-index: 1;
}
.matrix-count {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}
.matrix-count--zero {
  color: var(--text-muted);
  font-weight: 400;
}
.matrix-x-labels {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 3px;
  max-width: 500px;
  margin-left: 2rem;
}
.matrix-x-num {
  font-size: 0.65rem;
  color: var(--text-tertiary);
  text-align: center;
  font-variant-numeric: tabular-nums;
}
.matrix-x-title {
  font-size: 0.6rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  text-align: center;
  margin-top: 0.25rem;
}
/* Heat map: green (low) through yellow to red (high) */
.heat-1, .heat-2 { background: rgba(34,197,94,0.1); }
.heat-3, .heat-4 { background: rgba(34,197,94,0.18); }
.heat-5, .heat-6 { background: rgba(245,158,11,0.12); }
.heat-8, .heat-10 { background: rgba(245,158,11,0.2); }
.heat-12, .heat-15 { background: rgba(249,115,22,0.2); }
.heat-16, .heat-20 { background: rgba(239,68,68,0.2); }
.heat-25 { background: rgba(239,68,68,0.3); }
/* Matrix signal list */
.matrix-signals {
  margin-top: 1.5rem;
}

/* --- Utility Classes --- */
.text-green, .text-success { color: var(--success); }
.text-red, .text-danger { color: var(--danger); }
.text-muted { color: var(--text-tertiary); }
.text-accent { color: var(--accent); }
.text-info { color: var(--info); }
.text-xs { font-size: 0.75rem; }

/* --- Empty State --- */
.empty-state {
  text-align: center;
  padding: 3rem;
  color: var(--text-muted);
  border-radius: var(--radius);
}
.empty-state__hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
}

/* ============================================
   Responsive
   ============================================ */

/* Tablet */
@media (max-width: 768px) {
  .stats, .stats-categories {
    flex-wrap: wrap;
  }
  .stat-card {
    min-width: calc(50% - 0.5rem);
    flex: 1 1 calc(50% - 0.5rem);
  }
  .stat-card--cat {
    min-width: calc(33% - 0.375rem);
    flex: 1 1 calc(33% - 0.375rem);
  }
  .matrix-grid {
    max-width: 100%;
  }
  .matrix-x-labels {
    max-width: 100%;
  }
  .stat-card--featured {
    min-width: 100%;
  }
  .market-grid {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  }
  .detail-grid {
    grid-template-columns: 100px 1fr;
  }
  .event-row {
    flex-wrap: wrap;
    gap: 0.5rem;
  }
  .event-company {
    min-width: auto;
  }
  .event-date {
    min-width: auto;
  }
}

/* Mobile */
@media (max-width: 640px) {
  .container {
    padding: 1rem;
  }
  .stats, .stats-categories {
    flex-direction: column;
  }
  .stat-card, .stat-card--cat {
    min-width: 100%;
  }
  .market-grid,
  .infra-grid,
  .infra-grid--wide {
    grid-template-columns: 1fr;
  }
  .detail-grid {
    grid-template-columns: 1fr;
    gap: 0.25rem 0;
  }
  .detail-label {
    font-weight: 600;
    color: var(--text-secondary);
    margin-top: 0.5rem;
  }
  .event-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.375rem;
  }
  .event-source-tag {
    min-width: auto;
  }
  .event-company,
  .event-date {
    min-width: auto;
    text-align: left;
  }
  .epa-penalty,
  .epa-violations {
    min-width: auto;
    text-align: left;
  }
  .filters {
    gap: 0.375rem;
  }
  .filter-btn {
    font-size: 0.75rem;
    padding: 0.3rem 0.6rem;
  }
  .page-header h1 {
    font-size: 1.25rem;
  }
}

/* Mobile nav */
@media (max-width: 1023px) {
  .nav-toggle { display: flex; }
  .nav-links {
    display: none;
    flex-direction: column;
    width: 100%;
    gap: 0;
    padding: 0.5rem 0;
    border-top: 1px solid var(--border-default);
  }
  .nav-links--open { display: flex; }
  .nav-links a {
    padding: 0.625rem 0.75rem;
    border-radius: 0;
    font-size: 0.9rem;
  }
  .nav-links a:hover {
    background: var(--bg-surface);
  }
  .nav-inner {
    flex-wrap: wrap;
  }
}

/* Table horizontal scroll on mobile */
@media (max-width: 900px) {
  .table-responsive {
    position: relative;
  }
  .table-responsive::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    width: 2rem;
    background: linear-gradient(to right, transparent, var(--bg-primary));
    pointer-events: none;
    border-radius: 0 var(--radius) var(--radius) 0;
  }
}