:root {
  --paper: #f7f0e6;
  --paper-deep: #efe2cf;
  --ink: #1c1b18;
  --muted: #6a5f54;
  --accent: #d36a4d;
  --accent-2: #1f6f78;
  --accent-3: #f1c26a;
  --accent-4: #8c4c2c;
  --card: #fffaf1;
  --border: rgba(28, 27, 24, 0.12);
  --shadow: 0 18px 40px rgba(29, 28, 22, 0.15);
  --font-display: "Fraunces", "Georgia", serif;
  --font-body: "Space Grotesk", "Trebuchet MS", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background: linear-gradient(135deg, #f9f2e6 0%, #f3e3cc 45%, #f7f0e6 100%);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

body::before,
body::after {
  content: "";
  position: absolute;
  width: 440px;
  height: 440px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(211, 106, 77, 0.18), transparent 70%);
  top: -120px;
  right: -120px;
  z-index: 0;
}

body::after {
  width: 520px;
  height: 520px;
  background: radial-gradient(circle, rgba(31, 111, 120, 0.2), transparent 65%);
  top: 360px;
  left: -220px;
}

.page {
  position: relative;
  z-index: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 48px 24px 80px;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.hero {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  align-items: center;
  justify-content: space-between;
}

.hero-copy {
  flex: 1 1 420px;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent-4);
  margin: 0 0 12px;
}

h1 {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 3vw, 3.2rem);
  margin: 0 0 12px;
}

.subtitle {
  font-size: 1.05rem;
  color: var(--muted);
  max-width: 520px;
}

.hero-card {
  flex: 0 1 260px;
  background: var(--card);
  border: 1px solid var(--border);
  padding: 18px 20px;
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.hero-card-title {
  margin: 0 0 8px;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.hero-card-body {
  margin: 0;
  font-weight: 600;
}

.controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px;
  box-shadow: var(--shadow);
}

.control label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--muted);
}

.control select {
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #fffdf8;
  font-weight: 600;
}

.control.toggles {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.control .label {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 500;
}

.zoom-buttons {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 10px;
}

.btn {
  border: 1px solid var(--border);
  background: #fffdf8;
  color: var(--ink);
  padding: 8px 14px;
  border-radius: 999px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.08);
}

.chart-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 22px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.chart-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
}

.chart-head h2 {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-size: 2rem;
}

.chart-subtitle {
  margin: 0;
  color: var(--muted);
}

.chips {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.chip {
  background: var(--paper-deep);
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-4);
}

.chart-wrap {
  position: relative;
  width: 100%;
  height: 420px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.9), rgba(247, 240, 230, 0.9));
  border-radius: 16px;
  border: 1px solid rgba(28, 27, 24, 0.08);
  overflow: hidden;
}

#eloChart {
  width: 100%;
  height: 100%;
  display: block;
}

.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--muted);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
}

.swatch {
  width: 18px;
  height: 6px;
  border-radius: 999px;
  display: inline-block;
  background: var(--accent);
}

.swatch.line {
  background: var(--accent);
}

.swatch.eras {
  background: rgba(241, 194, 106, 0.7);
}

.swatch.coaches {
  background: rgba(31, 111, 120, 0.6);
}

.swatch.breaks {
  background: rgba(211, 106, 77, 0.6);
}

.tooltip {
  position: absolute;
  pointer-events: none;
  background: #1d1b18;
  color: #fef8ee;
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 0.85rem;
  opacity: 0;
  transform: translate(-50%, -120%);
  transition: opacity 0.1s ease;
  min-width: 180px;
  z-index: 5;
}

.tooltip strong {
  display: block;
  font-size: 0.95rem;
  margin-bottom: 4px;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.stat-card {
  padding: 18px;
  border-radius: 16px;
  background: var(--card);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.stat-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.stat-value {
  font-family: var(--font-display);
  font-size: 1.6rem;
}

.stat-sub {
  color: var(--muted);
  font-size: 0.9rem;
}

.notes {
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px;
  box-shadow: var(--shadow);
}

.notes h3 {
  margin-top: 0;
  font-family: var(--font-display);
}

.notes code {
  background: rgba(28, 27, 24, 0.08);
  padding: 2px 6px;
  border-radius: 6px;
}

[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 720px) {
  .page {
    padding: 32px 18px 64px;
  }

  .chart-wrap {
    height: 340px;
  }

  .hero {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}