/**
 * Lydia Sierra — Personal Developer Portfolio
 * Design System Tokens (CSS Custom Properties)
 * Conforming to DESIGN_SPEC.md v1.0
 */

:root,
[data-theme="light"] {
  /* ==========================================================================
     Color System — Light Theme (Default)
     ========================================================================== */
  --color-bg: #F8F5F2;
  --color-surface: #FFFFFF;
  --color-surface-subtle: #FBF9F7;

  --color-text-main: #2E2A27;
  --color-text-muted: #6E6862;

  --color-primary: #4A5D4E;
  --color-primary-hover: #3C4B3F;
  --color-primary-active: #313E34;
  --color-primary-contrast: #FFFFFF;

  --color-accent-turquoise: #7BCBC4;
  --color-turquoise-text: #25726B; /* Darkened for WCAG AA compliance (5.2:1 on cream canvas, 5.7:1 on white) */
  --color-accent-pink: #F2D5D5;

  --color-border: #E6E1DC;
  --color-border-subtle: #F0ECE7;

  --color-focus-ring: rgba(74, 93, 78, 0.45);
  --color-selection-bg: #E4ECE5;
  --color-selection-text: #2E2A27;

  /* ==========================================================================
     Typography Families with System Fallbacks
     ========================================================================== */
  --font-display: 'Instrument Serif', Georgia, 'Times New Roman', serif;
  --font-body: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', monospace;

  /* ==========================================================================
     Fluid Typography Scale (clamp-based)
     ========================================================================== */
  --text-xs: clamp(0.75rem, 0.72rem + 0.15vw, 0.8125rem);       /* 12px -> 13px */
  --text-sm: clamp(0.8125rem, 0.78rem + 0.2vw, 0.875rem);       /* 13px -> 14px */
  --text-base: clamp(0.9375rem, 0.9rem + 0.2vw, 1rem);          /* 15px -> 16px */
  --text-lg: clamp(1.0625rem, 1rem + 0.35vw, 1.125rem);         /* 17px -> 18px */
  --text-xl: clamp(1.1875rem, 1.1rem + 0.45vw, 1.3125rem);      /* 19px -> 21px */
  --text-2xl: clamp(1.375rem, 1.25rem + 0.65vw, 1.625rem);      /* 22px -> 26px */
  --text-3xl: clamp(1.75rem, 1.5rem + 1.2vw, 2.25rem);          /* 28px -> 36px */
  --text-4xl: clamp(2.25rem, 1.8rem + 2.2vw, 3.25rem);          /* 36px -> 52px */
  --text-5xl: clamp(2.75rem, 2.2rem + 2.8vw, 3.75rem);          /* 44px -> 60px */

  /* ==========================================================================
     Spacing Scale (8pt grid basis)
     ========================================================================== */
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.25rem;   /* 20px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */
  --space-20: 5rem;     /* 80px */
  --space-24: 6rem;     /* 96px */

  /* Fluid Section Spacing (Mobile: ~2rem - 2.5rem, Desktop: ~3rem - 3.75rem) */
  --section-gap: clamp(2rem, 1.5rem + 1.8vw, 3.5rem);
  --section-padding-y: clamp(2rem, 1.5rem + 1.8vw, 3.5rem);

  /* Heading to Content Gap (Mobile: ~1rem - 1.25rem, Desktop: ~1.5rem - 1.75rem) */
  --heading-gap: clamp(1rem, 0.85rem + 0.8vw, 1.75rem);

  /* Surface & Panel Padding */
  --panel-padding: clamp(1.25rem, 1rem + 1.2vw, 2.25rem);
  --card-padding-sm: clamp(0.75rem, 0.65rem + 0.5vw, 1.25rem);

  /* ==========================================================================
     Corner Radii Hierarchy
     ========================================================================== */
  --radius-xs: 4px;
  --radius-sm: 8px;     /* Buttons, form inputs */
  --radius-md: 12px;    /* Nested cards, skill & stat cards */
  --radius-lg: 16px;    /* Project cards, hero visual */
  --radius-xl: 24px;    /* Major section panel enclosures */
  --radius-full: 9999px;/* Pills, avatars, circular controls */

  /* ==========================================================================
     Elevation & Shadows
     ========================================================================== */
  --shadow-sm: 0 1px 3px rgba(46, 42, 39, 0.04), 0 1px 2px rgba(46, 42, 39, 0.02);
  --shadow-md: 0 4px 16px rgba(46, 42, 39, 0.06), 0 2px 6px rgba(46, 42, 39, 0.03);
  --shadow-lg: 0 12px 32px rgba(46, 42, 39, 0.08), 0 4px 12px rgba(46, 42, 39, 0.04);

  /* ==========================================================================
     Layout Boundaries (Mobile: ~1rem - 1.25rem, Desktop: ~1.5rem - 1.75rem)
     ========================================================================== */
  --container-max-width: 1140px;
  --container-padding: clamp(1rem, 0.75rem + 1vw, 1.75rem);

  /* ==========================================================================
     Transitions
     ========================================================================== */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================================================
   Color System — Dark Theme Token Overrides
   Activated via [data-theme="dark"] or system preference when not overridden
   ========================================================================== */
[data-theme="dark"] {
  --color-bg: #181614;
  --color-surface: #24201D;
  --color-surface-subtle: #2D2825;

  --color-text-main: #F5F2EE;
  --color-text-muted: #A8A199;

  --color-primary: #6E8E74;
  --color-primary-hover: #82A388;
  --color-primary-active: #5B7760;
  --color-primary-contrast: #181614;

  --color-accent-turquoise: #7BCBC4;
  --color-turquoise-text: #7BCBC4; /* High contrast on dark background */
  --color-accent-pink: #F2D5D5;

  --color-border: #3A342F;
  --color-border-subtle: #2F2925;

  --color-focus-ring: rgba(110, 142, 116, 0.55);
  --color-selection-bg: #354538;
  --color-selection-text: #F5F2EE;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 4px 18px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 12px 36px rgba(0, 0, 0, 0.45);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #181614;
    --color-surface: #24201D;
    --color-surface-subtle: #2D2825;

    --color-text-main: #F5F2EE;
    --color-text-muted: #A8A199;

    --color-primary: #6E8E74;
    --color-primary-hover: #82A388;
    --color-primary-active: #5B7760;
    --color-primary-contrast: #181614;

    --color-accent-turquoise: #7BCBC4;
    --color-turquoise-text: #7BCBC4;
    --color-accent-pink: #F2D5D5;

    --color-border: #3A342F;
    --color-border-subtle: #2F2925;

    --color-focus-ring: rgba(110, 142, 116, 0.55);
    --color-selection-bg: #354538;
    --color-selection-text: #F5F2EE;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.25);
    --shadow-md: 0 4px 18px rgba(0, 0, 0, 0.35);
    --shadow-lg: 0 12px 36px rgba(0, 0, 0, 0.45);
  }
}