/* ==========================================================
   Design Tokens — CPRL AI Laboratory
   ========================================================== */

:root {
  /* ── Colors (Light Mode) ────────────────────────────── */
  --color-background: #ffffff;
  --color-surface: #f4f4f5;
  --color-border: #e4e4e7;
  --color-text-primary: #09090b;
  --color-text-secondary: #71717a;
  --color-text-muted: #a1a1aa;

  /* Accent gradient */
  --color-accent-start: #2dd4bf;
  /* teal-400 */
  --color-accent-end: #3b82f6;
  /* blue-500 */

  /* Interactive */
  --color-button-bg: #09090b;
  --color-button-text: #ffffff;
  --color-button-hover: #27272a;
  --color-button-outline-border: #e4e4e7;
  --color-button-outline-hover: #f4f4f5;

  /* Header */
  --color-header-bg: rgba(255, 255, 255, 0.95);
  --color-header-blur: rgba(255, 255, 255, 0.6);

  /* ── Typography ─────────────────────────────────────── */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  --font-size-hero: clamp(2.5rem, 5vw, 4rem);
  --font-size-page-title: clamp(2rem, 4vw, 2.5rem);
  --font-size-section-label: 0.875rem;
  --font-size-card-title: 1.25rem;
  --font-size-body: 1rem;
  --font-size-caption: 0.875rem;
  --font-size-small: 0.75rem;

  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;

  --line-height-tight: 1.1;
  --line-height-snug: 1.2;
  --line-height-normal: 1.3;
  --line-height-relaxed: 1.6;

  --letter-spacing-tight: -0.02em;
  --letter-spacing-snug: -0.01em;
  --letter-spacing-wide: 0.1em;

  /* ── Spacing ────────────────────────────────────────── */
  --spacing-1: 0.25rem;
  --spacing-2: 0.5rem;
  --spacing-3: 0.75rem;
  --spacing-4: 1rem;
  --spacing-5: 1.25rem;
  --spacing-6: 1.5rem;
  --spacing-8: 2rem;
  --spacing-10: 2.5rem;
  --spacing-12: 3rem;
  --spacing-16: 4rem;
  --spacing-20: 5rem;
  --spacing-24: 6rem;

  /* ── Border Radius ──────────────────────────────────── */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* ── Transitions ────────────────────────────────────── */
  --transition-fast: 0.15s ease;
  --transition-base: 0.2s ease;
  --transition-slow: 0.3s ease;

  /* ── Shadows ────────────────────────────────────────── */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
}

/* ── Dark Mode ──────────────────────────────────────── */
[data-theme="dark"] {
  --color-background: #000000;
  --color-surface: #09090b;
  --color-border: #27272a;
  --color-text-primary: #ffffff;
  --color-text-secondary: #a1a1aa;
  --color-text-muted: #71717a;

  --color-button-bg: #ffffff;
  --color-button-text: #09090b;
  --color-button-hover: #e4e4e7;
  --color-button-outline-border: #27272a;
  --color-button-outline-hover: #18181b;

  --color-header-bg: rgba(0, 0, 0, 0.95);
  --color-header-blur: rgba(0, 0, 0, 0.6);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
}