@import url('https://fonts.googleapis.com/css2?family=Instrument+Serif&family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

/* ==========================================================================
   CSI Design System — Unified tokens, typography, and components
   ========================================================================== */

:root {
  /* Colors — Light mode */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F8F9FB;
  --bg-tertiary: #F1F3F6;
  --text-primary: #1A1A2E;
  --text-secondary: #6B7280;
  --text-tertiary: #9CA3AF;
  --accent-gold: #C8A951;
  --accent-gold-light: #D4B86620;
  --accent-blue: #3B82F6;
  --border: #E5E7EB;
  --border-light: #F1F3F6;

  /* Data tier colors */
  --tier-hyper: #10B981;
  --tier-mid: #3B82F6;
  --tier-premium: #F59E0B;
  --tier-ultra: #EF4444;

  /* Spacing scale */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  /* Border radius */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Typography */
  --font-heading: "Instrument Serif", Georgia, serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", "Fira Code", monospace;
}

/* Dark mode disabled — light mode only for now */

/* ==========================================================================
   Base element styles
   ========================================================================== */

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  /* no transition needed — light mode only */
}

.container {
  max-width: 1600px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

/* ==========================================================================
   Component classes
   ========================================================================== */

/* Card */
.card {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}

/* Stat Card */
.stat-card {
  background: var(--bg-secondary);
  border: none;
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  text-align: center;
}
.stat-card .stat-label {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: var(--space-xs);
}
.stat-card .stat-value {
  font-size: 28px;
  font-weight: 600;
  font-family: var(--font-mono);
  color: var(--text-primary);
}
.stat-card .stat-sub {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 2px;
}

/* Data Table */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.data-table th {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #374151;
  text-align: left;
  padding: var(--space-sm) var(--space-md);
  border-bottom: 2px solid var(--accent-gold);
}
.data-table td {
  padding: var(--space-sm) var(--space-md);
  border-bottom: 1px solid var(--border-light);
}
.data-table tbody tr:nth-child(even) {
  background: var(--bg-secondary);
}
.data-table tbody tr:hover {
  background: var(--bg-tertiary);
}
.data-table .num {
  text-align: right;
  font-family: var(--font-mono);
  font-weight: 500;
  color: #374151;
}
.data-table .csi-value {
  color: var(--accent-gold);
  font-weight: 700;
}

.sort-arrow {
  font-size: 10px;
  color: var(--accent-gold);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}
.badge-green {
  background: #10B98120;
  color: #10B981;
}
.badge-red {
  background: #EF444420;
  color: #EF4444;
}
.badge-gold {
  background: var(--accent-gold-light);
  color: var(--accent-gold);
}
.badge-beta {
  background: var(--accent-gold-light);
  color: var(--accent-gold);
  font-size: 11px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* Buttons */
.btn-primary {
  background: var(--accent-gold);
  color: #FFFFFF;
  border: none;
  padding: 10px 24px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: opacity 0.2s;
}
.btn-primary:hover {
  opacity: 0.9;
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
  padding: 10px 24px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-secondary:hover {
  background: var(--bg-secondary);
}

/* Chart Container */
.chart-container {
  position: relative;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
}

/* Section Typography */
.section-title {
  font-family: var(--font-heading);
  font-size: 24px;
  font-weight: 400;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.section-subtitle {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
  line-height: 1.6;
}

/* Hero Number */
.hero-number {
  font-family: var(--font-mono);
  font-size: 72px;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--accent-gold);
}

.hero-change-up {
  font-size: 14px;
  font-weight: 600;
  color: #10B981;
}
.hero-change-down {
  font-size: 14px;
  font-weight: 600;
  color: #EF4444;
}

/* Utility Classes */
.caption {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
}

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

.gold {
  color: var(--accent-gold);
}

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

@media (max-width: 768px) {
  .hero-number {
    font-size: 48px;
  }
  .stat-card .stat-value {
    font-size: 22px;
  }
  .container {
    padding: 0 16px;
  }
  .section-title {
    font-size: 20px;
  }
}

@media (max-width: 375px) {
  .hero-number {
    font-size: 36px;
  }
}