/**
 * Atlas Design Tokens
 * All visual values must reference these variables.
 */

:root {
  /* Colors — brand */
  --color-primary: #1a4d3e;
  --color-primary-dark: #143d31;
  --color-primary-light: #2d6a4f;
  --color-secondary: #475569;
  --color-accent: #c45d1e;
  --color-accent-dark: #a84d19;

  /* Colors — semantic */
  --color-success: #15803d;
  --color-warning: #b45309;
  --color-error: #b91c1c;
  --color-info: #1d4ed8;

  /* Colors — surfaces */
  --color-bg: #ffffff;
  --color-surface: #f8fafc;
  --color-surface-alt: #f1f5f9;
  --color-border: #e2e8f0;
  --color-border-strong: #cbd5e1;

  /* Colors — text */
  --color-text: #1e293b;
  --color-text-muted: #64748b;
  --color-text-inverse: #ffffff;
  --color-link: var(--color-primary);
  --color-link-hover: var(--color-primary-dark);

  /* Typography — families */
  --font-family-base: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-family-heading: var(--font-family-base);

  /* Typography — sizes */
  --font-size-xs: 0.8125rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-md: 1.125rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: clamp(1.375rem, 2vw, 1.75rem);
  --font-size-2xl: clamp(1.75rem, 2.5vw, 2.25rem);
  --font-size-3xl: clamp(2.125rem, 4vw, 3rem);

  /* Typography — weights */
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Typography — line heights */
  --line-height-tight: 1.25;
  --line-height-snug: 1.375;
  --line-height-base: 1.6;
  --line-height-relaxed: 1.75;

  /* Typography — letter spacing */
  --letter-spacing-tight: -0.02em;
  --letter-spacing-normal: 0;
  --letter-spacing-wide: 0.04em;

  /* Spacing — 8-point scale */
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 1rem;      /* 16px */
  --space-4: 1.5rem;    /* 24px */
  --space-5: 2rem;      /* 32px */
  --space-6: 2.5rem;    /* 40px */
  --space-7: 3rem;      /* 48px */
  --space-8: 4rem;      /* 64px */
  --space-9: 5rem;      /* 80px */
  --space-10: 6rem;     /* 96px */

  /* Container widths */
  --container-sm: 40rem;
  --container-md: 48rem;
  --container-lg: 64rem;
  --container-xl: 75rem;
  --container-prose: 42rem;

  /* Border radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgb(15 23 42 / 0.06);
  --shadow-md: 0 4px 12px rgb(15 23 42 / 0.08);
  --shadow-lg: 0 8px 24px rgb(15 23 42 / 0.1);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;

  /* Layout */
  --header-height: 4rem;
  --content-gap: var(--space-7);
  --section-gap: var(--space-8);
}