/* Design Token System — Single source of truth for all design decisions */
:root {
  /* Color — Light (default) */
  --color-ink: #24323d;
  --color-gold: #b8944d;
  --color-gold-hover: #c9a866;
  --color-cream: #f7f4ee;
  --color-paper: #ffffff;
  --color-stone: #6e6a62;
  --color-line: #ded9cf;
  --color-surface: rgba(255,255,255,0.9);
  --color-surface-elevated: rgba(255,255,255,0.98);

  /* Semantic aliases (used everywhere) */
  --text-primary: var(--color-ink);
  --text-secondary: var(--color-stone);
  --text-inverse: var(--color-paper);
  --accent: var(--color-gold);
  --accent-hover: var(--color-gold-hover);
  --bg-primary: var(--color-paper);
  --bg-secondary: var(--color-cream);
  --bg-surface: var(--color-surface);
  --bg-elevated: var(--color-surface-elevated);
  --border: var(--color-line);
  --shadow-color: rgba(36,50,61,0.08);
  --shadow-color-elevated: rgba(36,50,61,0.12);

  /* Legacy aliases — for backward compatibility with existing styles.css */
  --ink: var(--color-ink);
  --gold: var(--color-gold);
  --cream: var(--color-cream);
  --paper: var(--color-paper);
  --stone: var(--color-stone);
  --line: var(--color-line);
  --serif: var(--font-serif);
  --sans: var(--font-sans);

  /* Typography */
  --font-serif: 'Playfair Display', Georgia, serif;
  --font-sans: 'DM Sans', Arial, sans-serif;
  --text-display: clamp(3rem, 6vw, 6rem);
  --text-h1: clamp(2.5rem, 5vw, 4.5rem);
  --text-h2: clamp(2rem, 4vw, 3.5rem);
  --text-h3: clamp(1.5rem, 3vw, 2.5rem);
  --text-body: 1rem;
  --text-sm: 0.875rem;
  --text-xs: 0.75rem;

  /* Spacing Scale (8px base) */
  --space-1: 4px;  --space-2: 8px;  --space-3: 12px;  --space-4: 16px;
  --space-5: 24px; --space-6: 32px; --space-7: 48px;  --space-8: 64px;
  --space-9: 96px; --space-10: 128px;

  /* Spring Physics (stiffness, damping, mass) */
  --spring-gentle: 120 18 1;
  --spring-snappy: 180 22 1;
  --spring-bouncy: 280 20 1;
  --spring-stiff: 400 25 1;

  /* Duration Tokens */
  --duration-instant: 50ms;
  --duration-fast: 150ms;
  --duration-base: 250ms;
  --duration-slow: 400ms;
  --duration-slower: 600ms;

  /* Elevation System (Apple-style layered shadows) */
  --elevation-1: 0 1px 3px var(--shadow-color), 0 1px 2px var(--shadow-color);
  --elevation-2: 0 4px 12px var(--shadow-color), 0 2px 4px var(--shadow-color);
  --elevation-3: 0 12px 28px var(--shadow-color), 0 4px 8px var(--shadow-color);
  --elevation-4: 0 20px 48px var(--shadow-color), 0 8px 16px var(--shadow-color);
  --elevation-5: 0 32px 64px var(--shadow-color), 0 12px 24px var(--shadow-color);

  /* Glassmorphism */
  --glass-blur: 20px;
  --glass-sat: 180%;
  --glass-bg: rgba(255,255,255,0.72);
  --glass-border: rgba(255,255,255,0.24);

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 999px;

  /* Z-Index Scale */
  --z-base: 1;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-modal: 400;
  --z-toast: 500;
  --z-tooltip: 600;

  /* Motion easing fallback */
  --motion-ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* Reduced motion — granular, not binary */
@media (prefers-reduced-motion: reduce) {
  :root {
    --duration-instant: 0ms;
    --duration-fast: 0ms;
    --duration-base: 0ms;
    --duration-slow: 0ms;
    --duration-slower: 0ms;
  }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus visible polyfill styles */
:focus:not(:focus-visible) { outline: none; }
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Selection color */
::selection { background: color-mix(in srgb, var(--accent) 30%, transparent); }