/* ==========================================================================
   variables.css
   Design tokens — colors, typography, spacing, radius, shadow, motion
   ========================================================================== */

:root {
  /* ----- Color: brand ----- */
  --color-bg: #F8FAFC;
  --color-primary: #2563EB;
  --color-primary-rgb: 37, 99, 235;
  --color-secondary: #3B82F6;
  --color-accent: #38BDF8;
  --color-card: #FFFFFF;
  --color-text: #111827;
  --color-text-secondary: #6B7280;
  --color-border: #E5E7EB;
  --color-success: #10B981;
  --color-danger: #EF4444;

  /* ----- Color: surfaces derived from brand ----- */
  --color-bg-elevated: #FFFFFF;
  --color-bg-subtle: #EFF4FB;
  --color-overlay: rgba(17, 24, 39, 0.5);
  --color-skeleton: #EDF1F7;

  /* ----- Typography ----- */
  --font-display: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  --fs-2xs: 0.6875rem;   /* 11px */
  --fs-xs: 0.75rem;      /* 12px */
  --fs-sm: 0.875rem;     /* 14px */
  --fs-base: 1rem;       /* 16px */
  --fs-md: 1.125rem;     /* 18px */
  --fs-lg: 1.375rem;     /* 22px */
  --fs-xl: 1.75rem;      /* 28px */
  --fs-2xl: 2.25rem;     /* 36px */
  --fs-3xl: 3.25rem;     /* 52px */
  --fs-hero: 5.5rem;     /* 88px */

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

  --lh-tight: 1.1;
  --lh-snug: 1.35;
  --lh-normal: 1.6;

  --ls-tight: -0.03em;
  --ls-snug: -0.015em;
  --ls-wide: 0.06em;

  /* ----- Spacing scale (4px base) ----- */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-7: 32px;
  --space-8: 40px;
  --space-9: 48px;
  --space-10: 64px;
  --space-11: 80px;
  --space-12: 96px;

  /* ----- Radius ----- */
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-full: 999px;

  /* ----- Shadow ----- */
  --shadow-xs: 0 1px 2px rgba(17, 24, 39, 0.04);
  --shadow-sm: 0 2px 8px rgba(17, 24, 39, 0.06);
  --shadow-md: 0 8px 24px rgba(17, 24, 39, 0.08);
  --shadow-lg: 0 16px 40px rgba(17, 24, 39, 0.10);
  --shadow-primary: 0 12px 28px rgba(37, 99, 235, 0.24);
  --shadow-focus: 0 0 0 4px rgba(37, 99, 235, 0.16);

  /* ----- Motion ----- */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --dur-fast: 150ms;
  --dur-base: 250ms;
  --dur-slow: 450ms;
  --dur-slower: 800ms;

  /* ----- Layout ----- */
  --container-max: 1120px;
  --header-height: 76px;
}

/* ----- Dark theme overrides ----- */
html[data-theme="dark"] {
  --color-bg: #0B1220;
  --color-bg-elevated: #121B2E;
  --color-bg-subtle: #0F1A2C;
  --color-card: #141F35;
  --color-text: #F3F6FB;
  --color-text-secondary: #94A3B8;
  --color-border: #22304A;
  --color-skeleton: #1B283F;
  --color-overlay: rgba(4, 8, 16, 0.6);

  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.2);
  --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.28);
  --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.36);
  --shadow-lg: 0 20px 48px rgba(0, 0, 0, 0.42);
  --shadow-primary: 0 14px 32px rgba(37, 99, 235, 0.34);
}