:root {
  /* =========================================================
     DATA TERMINAL — design tokens
     Near-black base · emerald + sky signal · mono-forward
     ========================================================= */

  /* Background Colors */
  --bg-primary: #0a0b0f;
  --bg-secondary: #0e1016;
  --bg-elevated: #12151c;
  --bg-card: rgba(255, 255, 255, 0.03);
  --bg-glass: rgba(255, 255, 255, 0.035);
  --border-glass: rgba(255, 255, 255, 0.08);
  --border-subtle: rgba(255, 255, 255, 0.05);

  /* Signal / accent colors (single source of truth) */
  --accent: #34d399;          /* emerald */
  --accent-rgb: 52, 211, 153;
  --accent-2: #38bdf8;        /* sky */
  --accent-2-rgb: 56, 189, 248;
  --accent-warm: #fbbf24;     /* rare terminal highlight */

  /* Backward-compatible aliases (used across legacy CSS) */
  --color-primary: var(--accent);
  --color-secondary: var(--accent-2);
  --color-accent: var(--accent-2);
  --color-success: var(--accent);

  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #34d399 0%, #38bdf8 100%);
  --gradient-accent: linear-gradient(135deg, #38bdf8 0%, #34d399 100%);
  --gradient-text: linear-gradient(135deg, #34d399 0%, #38bdf8 100%);
  --gradient-signal: linear-gradient(135deg, #34d399 0%, #38bdf8 100%);
  --gradient-hero-bg: radial-gradient(ellipse at 70% 30%, rgba(52, 211, 153, 0.12) 0%, transparent 60%),
                      radial-gradient(ellipse at 30% 70%, rgba(56, 189, 248, 0.08) 0%, transparent 60%);

  /* Text Colors */
  --text-primary: #e6e8eb;
  --text-secondary: #9ba3ae;
  --text-muted: #5b6573;

  /* Typography */
  --font-heading: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', 'Cascadia Code', monospace;

  /* Layout */
  --container-max: 1200px;
  --nav-height: 80px;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 40px rgba(var(--accent-rgb), 0.18);
  --shadow-glow-strong: 0 0 60px rgba(var(--accent-rgb), 0.32);
  --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.45), 0 1px 0 rgba(255, 255, 255, 0.04);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}