/* ═══════════════════════════════════════════════════════════════
   AI Agent Performance Frontier — FT-inspired Light Theme
   Warm paper tones, formal serif headings, clean data presentation
   ═══════════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Libre+Baskerville:ital,wght@0,400;0,700;1,400&family=Inter:wght@300;400;500;600&family=IBM+Plex+Mono:wght@300;400;500&display=swap');

/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  /* Background — FT paper tones */
  --bg-page: #FFF1E5;
  --bg-surface: #FFFFFF;
  --bg-card: #FFFFFF;
  --bg-card-hover: #FBF5F0;
  --bg-muted: #F6ECE1;

  /* Text — dark warm ink */
  --text-primary: #33302E;
  --text-secondary: #66605C;
  --text-tertiary: #9E9893;
  --text-accent: #0D7680;
  --text-link: #0D7680;

  /* Semantic colors — SWE-rebench */
  --color-closed: #0D7680;     /* FT teal for closed-source */
  --color-open: #CC5B2F;       /* warm terracotta for open-source */
  --color-closed-bg: rgba(13,118,128,0.08);
  --color-open-bg: rgba(204,91,47,0.08);

  /* Semantic colors — METR thresholds */
  --color-p50: #0D7680;        /* teal */
  --color-p80: #593380;        /* plum */

  /* Model family colors — muted, print-friendly */
  --family-openai: #0D7680;
  --family-anthropic: #AD6231;
  --family-google: #2C5EA0;
  --family-deepseek: #593380;
  --family-qwen: #7A4B2A;
  --family-xai: #9E3A3A;
  --family-glm: #2A6B5E;
  --family-kimi: #6B3FA0;
  --family-mistral: #A03A6B;
  --family-minimax: #4B7A2A;
  --family-other: #66605C;

  /* Grid & borders */
  --border-light: #E6D9CE;
  --border-medium: #CCC1B7;
  --grid-line: rgba(51,48,46,0.08);

  /* Spacing */
  --section-gap: 4rem;
  --card-radius: 4px;

  /* Fonts */
  --font-serif: 'Libre Baskerville', Georgia, 'Times New Roman', serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'IBM Plex Mono', 'SF Mono', 'Fira Code', monospace;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-page);
  color: var(--text-primary);
  line-height: 1.65;
  min-height: 100vh;
}

a {
  color: var(--text-link);
  text-decoration: none;
  border-bottom: 1px solid var(--border-light);
  transition: border-color 0.2s;
}

a:hover {
  border-bottom-color: var(--text-link);
}

/* ── Typography ── */
h1, h2, h3 {
  font-family: var(--font-serif);
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 600;
  color: var(--text-primary);
}

.headline {
  font-family: var(--font-serif);
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 700;
  line-height: 1.15;
  color: var(--text-primary);
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 0.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--text-primary);
}

.mono {
  font-family: var(--font-mono);
}

.stat-number {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 1.5rem;
  letter-spacing: -0.02em;
}

.stat-number-sm {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 1.125rem;
}

/* ── Layout ── */
.site-container {
  max-width: 960px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

.section {
  margin-bottom: var(--section-gap);
}

/* ── Header ── */
.site-header {
  padding: 2.5rem 0 2rem;
  border-bottom: 4px solid var(--text-primary);
  margin-bottom: 2.5rem;
}

.site-header .subtitle {
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--text-secondary);
  font-size: 1rem;
  margin-top: 0.75rem;
  max-width: 640px;
  line-height: 1.5;
}

.last-updated {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-tertiary);
  margin-top: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

/* ── Citation Blocks ── */
.citation-block {
  background: var(--bg-muted);
  border-left: 3px solid var(--border-medium);
  padding: 1rem 1.25rem;
  margin: 1.25rem 0 1.75rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.citation-block a {
  color: var(--text-link);
  border-bottom: 1px solid var(--border-light);
}

.citation-block a:hover {
  border-bottom-color: var(--text-link);
}

.citation-block .paper-ref {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-tertiary);
  margin-top: 0.5rem;
  display: block;
}

/* ── Stat Cards ── */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 0.75rem;
  margin-bottom: 1.75rem;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--card-radius);
  padding: 1rem 1.125rem;
}

.stat-card:hover {
  background: var(--bg-card-hover);
}

.stat-card[title] {
  cursor: help;
}

.stat-card .label {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-tertiary);
  margin-bottom: 0.35rem;
}

.stat-card .model-name {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-top: 0.2rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.stat-card.accent-closed { border-top: 3px solid var(--color-closed); }
.stat-card.accent-open { border-top: 3px solid var(--color-open); }
.stat-card.accent-gap { border-top: 3px solid var(--text-tertiary); }
.stat-card.accent-p50 { border-top: 3px solid var(--color-p50); }
.stat-card.accent-p80 { border-top: 3px solid var(--color-p80); }

/* ── Toggle Controls ── */
.controls-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  margin-bottom: 1.25rem;
}

.toggle-group {
  display: inline-flex;
  border: 1px solid var(--border-medium);
  border-radius: 3px;
  overflow: hidden;
}

.toggle-btn {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.4rem 0.85rem;
  border: none;
  border-right: 1px solid var(--border-light);
  background: var(--bg-surface);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s;
  white-space: nowrap;
}

.toggle-btn:last-child {
  border-right: none;
}

.toggle-btn:hover {
  color: var(--text-primary);
  background: var(--bg-muted);
}

.toggle-btn.active {
  background: var(--text-primary);
  color: var(--bg-page);
}

.controls-label {
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-right: 0.15rem;
}

/* ── Chart Containers ── */
.chart-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--card-radius);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  position: relative;
}

.chart-wrapper canvas {
  max-height: 480px;
}

/* ── Methodology Notes ── */
.methodology {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.7;
  padding: 1.25rem 0;
  border-top: 1px solid var(--border-light);
  margin-top: 0.75rem;
}

.methodology strong {
  color: var(--text-primary);
  font-weight: 600;
}

.methodology h4 {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-top: 1rem;
  margin-bottom: 0.35rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.methodology ul {
  margin: 0.4rem 0;
  padding-left: 1.25rem;
}

.methodology li {
  margin-bottom: 0.3rem;
}

.methodology em {
  font-style: italic;
}

.methodology code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: var(--bg-muted);
  padding: 0.1em 0.35em;
  border-radius: 2px;
}

.methodology .formula-block {
  background: var(--bg-muted);
  border-left: 3px solid var(--border-medium);
  padding: 0.75rem 1rem;
  margin: 0.75rem 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.8;
  overflow-x: auto;
}

/* ── Projection Table ── */
.projection-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
  margin: 1.25rem 0;
}

.projection-table th {
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-tertiary);
  padding: 0.6rem 0.75rem;
  border-bottom: 2px solid var(--text-primary);
  text-align: left;
}

.projection-table td {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-secondary);
}

.projection-table tr:hover td {
  background: var(--bg-muted);
}

.projection-table .highlight {
  color: var(--text-primary);
  font-weight: 500;
}

/* ── Footer ── */
.site-footer {
  text-align: center;
  padding: 2rem 0 1.5rem;
  border-top: 1px solid var(--border-light);
  color: var(--text-tertiary);
  font-size: 0.8rem;
}

.site-footer a {
  color: var(--text-link);
  border-bottom: 1px solid transparent;
}

.site-footer a:hover {
  border-bottom-color: var(--text-link);
}

/* ── Legend ── */
.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
  font-size: 0.75rem;
  color: var(--text-secondary);
}

.legend-item {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.legend-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  display: inline-block;
}

.legend-diamond {
  width: 9px;
  height: 9px;
  transform: rotate(45deg);
  display: inline-block;
}

.legend-line {
  width: 18px;
  height: 2px;
  display: inline-block;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .site-container {
    padding: 1rem;
  }
  .stat-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .chart-wrapper {
    padding: 1rem;
  }
  .controls-row {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .stat-grid {
    grid-template-columns: 1fr;
  }
}

/* ── Family color utilities ── */
.family-openai { color: var(--family-openai); }
.family-anthropic { color: var(--family-anthropic); }
.family-google { color: var(--family-google); }
.family-deepseek { color: var(--family-deepseek); }
.family-qwen { color: var(--family-qwen); }
.family-xai { color: var(--family-xai); }
.family-glm { color: var(--family-glm); }
.family-kimi { color: var(--family-kimi); }
.family-mistral { color: var(--family-mistral); }
.family-minimax { color: var(--family-minimax); }

/* ── Scrollbar — subtle ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-page); }
::-webkit-scrollbar-thumb { background: var(--border-medium); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-tertiary); }

/* ── Selection ── */
::selection {
  background: rgba(13,118,128,0.2);
}