:root {
  --bg: #fefefe;
  --text: #1a1a1a;
  --text-muted: #666;
  --border: #1a1a1a;
  --accent: #1a1a1a;
  --gray-100: #f5f5f5;
  --gray-200: #e5e5e5;
  --gray-300: #d4d4d4;
  --gray-400: #a3a3a3;
  --gray-500: #737373;
  --gray-600: #525252;
  --gray-700: #404040;
  --gray-800: #262626;
}

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

body {
  font-family: "SF Mono", "Fira Code", "JetBrains Mono", monospace;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  padding: 2rem;
  max-width: 900px;
  margin: 0 auto;
}

/* Header */
header {
  border: 2px solid var(--border);
  padding: 2rem;
  margin-bottom: 2rem;
}

h1 {
  font-size: 1.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin-bottom: 0.5rem;
}

.subtitle {
  color: var(--text-muted);
  font-size: 0.85rem;
}

/* Narrative intro */
.narrative {
  border: 2px solid var(--border);
  padding: 1.5rem;
  margin-bottom: 2rem;
  background: var(--gray-100);
}

.narrative p {
  font-size: 0.9rem;
  margin-bottom: 1rem;
}

.narrative p:last-child {
  margin-bottom: 0;
}

.narrative strong {
  background: var(--gray-800);
  color: var(--bg);
  padding: 0.1em 0.3em;
}

.highlight-song {
  border-left: 3px solid var(--border);
  padding-left: 1rem;
  margin: 1.5rem 0;
  font-style: italic;
}

/* Condensed metrics */
.metrics-condensed {
  border: 2px solid var(--border);
  padding: 1.5rem;
  margin-bottom: 2rem;
  text-align: center;
}

.metrics-condensed .big-number {
  font-size: 3.5rem;
  font-weight: 900;
  line-height: 1;
}

.metrics-condensed .big-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.metrics-row {
  display: flex;
  justify-content: center;
  gap: 3rem;
  margin-top: 1rem;
  font-size: 0.85rem;
}

.metrics-row span {
  color: var(--text-muted);
}

/* Sections */
.section {
  border: 2px solid var(--border);
  margin-bottom: 2rem;
}

.section-header {
  background: var(--border);
  color: var(--bg);
  padding: 0.75rem 1rem;
  font-weight: 700;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.section-content {
  padding: 1.5rem;
}

.section-note {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--gray-200);
}

/* Top Lists */
.two-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.column-title {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--gray-200);
}

.top-list {
  list-style: none;
}

.top-list li {
  display: grid;
  grid-template-columns: 1.5rem 1fr auto;
  gap: 0.75rem;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--gray-100);
  align-items: baseline;
}

.top-list li:last-child {
  border-bottom: none;
}

.rank {
  font-weight: 800;
  font-size: 0.9rem;
}

.top-name {
  font-weight: 600;
  font-size: 0.85rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.top-artist {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.top-stats {
  text-align: right;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Charts */
.chart-container {
  width: 100%;
  overflow-x: auto;
}

.chart-annotation {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--gray-200);
}

/* Comparison */
.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}

.comparison-card {
  padding: 1.5rem;
  text-align: center;
}

.comparison-card:first-child {
  border-right: 1px solid var(--gray-200);
}

.comparison-title {
  font-weight: 700;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.comparison-value {
  font-size: 2rem;
  font-weight: 900;
  line-height: 1.2;
}

.comparison-unit {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.comparison-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  margin-top: 0.25rem;
}

.comparison-secondary {
  margin-top: 1rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Skip list */
.skip-list {
  list-style: none;
}

.skip-list li {
  display: grid;
  grid-template-columns: 3rem 1fr;
  gap: 1rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--gray-100);
  align-items: center;
}

.skip-rate {
  font-weight: 800;
  font-size: 0.9rem;
}

.skip-info {
  font-size: 0.85rem;
}

.skip-track {
  font-weight: 600;
}

.skip-artist {
  font-size: 0.75rem;
  color: var(--text-muted);
}

/* Methodology */
.methodology {
  border: 2px solid var(--border);
  padding: 1.5rem;
  margin-bottom: 2rem;
  background: var(--gray-100);
}

.methodology h3 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.methodology ul {
  list-style: none;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.methodology li {
  margin-bottom: 0.5rem;
  padding-left: 1rem;
  position: relative;
}

.methodology li::before {
  content: "→";
  position: absolute;
  left: 0;
}

/* Footer */
footer {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
  font-size: 0.75rem;
}

/* Substack CTA Banner - styled like section headers */
.cta-banner {
  background: var(--border);
  color: var(--bg);
  padding: 0.75rem 1rem;
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-weight: 700;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.cta-banner-text {
  color: var(--bg);
}

.cta-banner-text strong {
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.cta-banner-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--bg);
  color: var(--text);
  text-decoration: none;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.5rem 1rem;
  white-space: nowrap;
  transition: background 0.2s ease;
}

.cta-banner-link:hover {
  background: var(--gray-200);
}

.cta-banner-link::after {
  content: "→";
}

@media (max-width: 600px) {
  .cta-banner {
    flex-direction: column;
    text-align: center;
  }

  .cta-banner-link {
    width: 100%;
    justify-content: center;
    padding: 0.75rem 1rem;
  }
}

/* Navigation */
nav {
  border: 2px solid var(--border);
  padding: 1rem;
  margin-bottom: 2rem;
  display: flex;
  gap: 1.5rem;
  justify-content: center;
}

nav a {
  color: var(--text);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.25rem 0.5rem;
}

nav a:hover {
  background: var(--gray-100);
}

nav a.active {
  background: var(--text);
  color: var(--bg);
}

/* Observable Plot overrides */
svg {
  font-family: inherit;
}

@media (max-width: 600px) {
  body {
    padding: 1rem;
  }

  h1 {
    font-size: 1.25rem;
  }

  .two-columns,
  .comparison-grid {
    grid-template-columns: 1fr;
  }

  .comparison-card:first-child {
    border-right: none;
    border-bottom: 1px solid var(--gray-200);
  }

  .metrics-row {
    flex-direction: column;
    gap: 0.5rem;
  }

  nav {
    flex-wrap: wrap;
  }
}