:root {
  --bg-primary: #f8f9fb;
  --bg-white: #ffffff;
  --bg-warm: #f3f4f6;
  --bg-header: #1b2a3d;
  --bg-header-alt: #243547;
  --text-primary: #1f2937;
  --text-secondary: #4b5563;
  --text-muted: #9ca3af;
  --border: #e5e7eb;
  --border-strong: #d1d5db;
  --accent: #0d7377;
  --accent-light: rgba(13, 115, 119, 0.08);
  --accent-hover: #0a5f62;
  --positive: #059669;
  --positive-light: rgba(5, 150, 105, 0.06);
  --negative: #dc2626;
  --negative-light: rgba(220, 38, 38, 0.06);
  --amber: #d97706;
  --purple: #7c3aed;
  --teal: #0d9488;
  --radius: 8px;
  --radius-sm: 5px;
  --radius-lg: 10px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-lg: 0 4px 12px rgba(0,0,0,0.06);
}

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

html {
  font-size: 15px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.55;
  min-height: 100vh;
}

.container {
  max-width: 1260px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ========== HEADER ========== */
header {
  background: var(--bg-header);
  padding: 2rem 0 1.75rem;
}

header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.3;
  margin-bottom: 0.5rem;
  color: #fff;
}

header .subtitle {
  color: rgba(255,255,255,0.65);
  font-size: 0.88rem;
  max-width: 740px;
  line-height: 1.65;
}

header .badge {
  display: inline-block;
  background: rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.8);
  font-size: 0.6rem;
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  margin-bottom: 0.6rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border: 1px solid rgba(255,255,255,0.15);
}

/* ========== CONTROLS PANEL ========== */
.controls {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 0;
  margin: 1.25rem 0;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.controls-section {
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
}

.controls-section:last-child {
  border-bottom: none;
}

.controls-section-label {
  font-size: 0.6rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.controls-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1.25rem;
  align-items: end;
}

.controls-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  align-items: end;
}

.controls-grid-4 {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr;
  gap: 1.25rem;
  align-items: end;
}

.control-group label {
  display: block;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.4rem;
}

.slider-container {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  flex: 1;
  height: 4px;
  border-radius: 2px;
  background: var(--border-strong);
  outline: none;
  transition: background 0.15s;
}

input[type="range"]:hover {
  background: #b0b7c3;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: 3px solid #fff;
  box-shadow: 0 0 0 1px var(--accent), 0 1px 3px rgba(0,0,0,0.15);
  transition: transform 0.1s;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.12);
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent);
  cursor: pointer;
  border: 3px solid #fff;
  box-shadow: 0 0 0 1px var(--accent), 0 1px 3px rgba(0,0,0,0.15);
}

.slider-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent);
  min-width: 3.2rem;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.slider-value-sm {
  font-size: 1rem;
  min-width: 2.75rem;
}

.toggle-container {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.toggle {
  position: relative;
  width: 40px;
  height: 22px;
  flex-shrink: 0;
}

.toggle input { opacity: 0; width: 0; height: 0; }

.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--border-strong);
  border-radius: 11px;
  cursor: pointer;
  transition: background 0.2s;
}

.toggle-slider::before {
  content: '';
  position: absolute;
  left: 2px;
  top: 2px;
  width: 18px;
  height: 18px;
  background: #fff;
  border-radius: 50%;
  transition: transform 0.2s;
  box-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.toggle input:checked + .toggle-slider { background: var(--accent); }
.toggle input:checked + .toggle-slider::before { transform: translateX(18px); }

.toggle-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

select {
  width: 100%;
  padding: 0.5rem 0.65rem;
  background: var(--bg-white);
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  cursor: pointer;
  outline: none;
  transition: border-color 0.15s;
}

select:focus { border-color: var(--accent); }

/* ========== PRESETS ========== */
.presets {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  padding: 0.75rem 1.5rem;
  background: var(--bg-warm);
  border-top: 1px solid var(--border);
}

.preset-btn {
  padding: 0.35rem 0.85rem;
  background: var(--bg-white);
  color: var(--text-secondary);
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s;
}

.preset-btn:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* ========== SECTION HEADINGS ========== */
.section-heading {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin: 1.75rem 0 0.6rem;
  padding-left: 0.15rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.section-heading::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

/* ========== SUMMARY ========== */
.summary-box {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 1rem 1.25rem;
  margin: 1rem 0;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--text-secondary);
  box-shadow: var(--shadow-sm);
}

.summary-box strong { color: var(--text-primary); }

/* ========== METRIC CARDS ========== */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.65rem;
  margin: 0.6rem 0;
}

.metric-card {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.9rem 1rem;
  transition: box-shadow 0.15s, border-color 0.15s;
  box-shadow: var(--shadow-sm);
}

.metric-card:hover {
  box-shadow: var(--shadow);
  border-color: var(--border-strong);
}

.metrics-grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.reform-placeholder {
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-left: 3px solid var(--text-muted);
  border-radius: var(--radius-sm);
  padding: 0.9rem 1.25rem;
  margin: 0.6rem 0;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-style: italic;
}

.metric-label {
  font-size: 0.62rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 0.2rem;
  line-height: 1.4;
}

.metric-value {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
  line-height: 1.3;
}

.metric-value.positive { color: var(--positive); }
.metric-value.negative { color: var(--negative); }

.metric-value-alt {
  font-size: 1.05rem;
  margin-top: 0.15rem;
}

.metric-sub {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 0.1rem;
  line-height: 1.4;
}

/* ========== HERO PROJECTION SECTION ========== */
.projection-hero {
  background: linear-gradient(135deg, rgba(13, 115, 119, 0.03) 0%, rgba(13, 115, 119, 0.06) 100%);
  border: 1px solid rgba(13, 115, 119, 0.15);
  border-radius: var(--radius-lg);
  padding: 1rem;
  margin: 0.6rem 0;
  box-shadow: var(--shadow-lg);
}

.projection-hero .metrics-grid {
  margin: 0;
}

.projection-hero .metric-card {
  border-color: rgba(13, 115, 119, 0.12);
}

.projection-hero .metric-card:hover {
  border-color: rgba(13, 115, 119, 0.25);
}

/* ========== CHARTS ========== */
.charts-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin: 0.6rem 0;
}

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

.chart-card h3 {
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
  color: var(--text-primary);
}

.chart-card .chart-desc {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  line-height: 1.5;
}

.chart-wrap {
  position: relative;
  height: 270px;
}

/* ========== ACCORDION ========== */
.accordion {
  margin: 1rem 0;
}

.accordion-toggle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.8rem 1rem;
  color: var(--text-primary);
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
  box-shadow: var(--shadow-sm);
}

.accordion-toggle:hover { background: var(--bg-warm); }

.accordion-icon {
  font-size: 1rem;
  color: var(--text-muted);
  font-weight: 400;
}

.accordion-content {
  display: none;
  background: var(--bg-white);
  border: 1px solid var(--border);
  border-top: none;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  padding: 1.25rem;
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

.accordion-content.open { display: block; }

.accordion-content h4 {
  color: var(--text-primary);
  font-size: 0.88rem;
  margin: 1.25rem 0 0.4rem;
}

.accordion-content h4:first-child { margin-top: 0; }
.accordion-content p { margin-bottom: 0.6rem; }

.accordion-content ul,
.accordion-content ol {
  margin: 0.4rem 0 0.6rem 1.5rem;
}

.accordion-content li { margin-bottom: 0.25rem; }

.accordion-content code {
  background: var(--bg-warm);
  padding: 0.15rem 0.35rem;
  border-radius: 3px;
  font-size: 0.8rem;
  color: var(--accent);
  border: 1px solid var(--border);
}

/* ========== DATA TABLES ========== */
.data-table {
  width: 100%;
  border-collapse: collapse;
  margin: 0.6rem 0 1rem;
  font-size: 0.78rem;
}

.data-table th {
  background: var(--bg-warm);
  color: var(--text-secondary);
  font-weight: 600;
  text-align: left;
  padding: 0.5rem 0.65rem;
  border-bottom: 2px solid var(--border-strong);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.data-table td {
  padding: 0.4rem 0.65rem;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
}

.data-table tr:hover td { background: var(--bg-warm); }

.data-table .num {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.source-link {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.8rem;
}

.source-link:hover { text-decoration: underline; }

/* ========== BADGES ========== */
.vintage-badge {
  display: inline-block;
  background: rgba(217, 119, 6, 0.08);
  color: var(--amber);
  font-size: 0.52rem;
  font-weight: 700;
  padding: 0.08rem 0.4rem;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  vertical-align: middle;
  margin-left: 0.2rem;
  border: 1px solid rgba(217, 119, 6, 0.15);
}

.range-note {
  color: var(--text-muted);
  font-size: 0.82em;
}

.positive-text { color: var(--positive) !important; }

/* ========== FOOTER ========== */
footer {
  border-top: 1px solid var(--border);
  padding: 1.75rem 0;
  margin-top: 1.5rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.72rem;
  line-height: 1.7;
}

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

footer a:hover { text-decoration: underline; }

/* ========== RESPONSIVE ========== */
@media (max-width: 1024px) {
  .controls-grid-4 {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  html { font-size: 14px; }

  .controls-grid,
  .controls-grid-2,
  .controls-grid-4 {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .metrics-grid,
  .metrics-grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .charts-grid {
    grid-template-columns: 1fr;
  }

  .chart-card[style*="grid-column: span 2"] {
    grid-column: span 1 !important;
  }

  header h1 { font-size: 1.25rem; }
}

@media (max-width: 480px) {
  .container { padding: 0 1rem; }

  header h1 { font-size: 1.1rem; }

  .metrics-grid,
  .metrics-grid-3 {
    grid-template-columns: 1fr;
  }

  .presets {
    flex-direction: column;
  }

  .preset-btn {
    text-align: center;
  }
}