@layer reset, base, components, modules, utilities, native, platform;

:root {
  /* Fonts — system stack, no external requests */
  --font-display: ui-serif, Georgia, "Times New Roman", serif;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "Fira Code", monospace;

  /* Spacing */
  --inline-space: 1ch;
  --inline-space-half: calc(var(--inline-space) / 2);
  --inline-space-double: calc(var(--inline-space) * 2);
  --block-space: 1rem;
  --block-space-half: calc(var(--block-space) / 2);
  --block-space-double: calc(var(--block-space) * 2);

  /* Text sizes */
  --text-xx-small: 0.55rem;
  --text-x-small: 0.75rem;
  --text-small: 0.85rem;
  --text-normal: 1rem;
  --text-medium: 1.1rem;
  --text-large: 1.5rem;
  --text-x-large: 1.8rem;
  --text-xx-large: 2.5rem;

  @media (max-width: 639px) {
    --text-xx-small: 0.65rem;
    --text-x-small: 0.85rem;
    --text-small: 0.95rem;
    --text-normal: 1.1rem;
    --text-medium: 1.2rem;
    --text-large: 1.5rem;
    --text-x-large: 1.8rem;
    --text-xx-large: 2.5rem;
  }

  /* Hutmail palette - OKLCH
     Beaver lodge: warm wood browns + river blues */

  /* Base tones */
  --lch-paper: 97% 0.005 70;
  --lch-ink: 22% 0.006 50;
  --lch-graphite: 45% 0.01 60;
  --lch-dust: 92% 0.003 55;
  --lch-asphalt: 27% 0.006 40;

  /* Wood scale (hue 65 — warm brown) */
  --lch-wood-darkest: 26% 0.06 65;
  --lch-wood-darker: 38% 0.08 65;
  --lch-wood-dark: 50% 0.09 65;
  --lch-wood-medium: 62% 0.08 65;
  --lch-wood-light: 76% 0.06 65;
  --lch-wood-lighter: 88% 0.04 65;
  --lch-wood-lightest: 95% 0.02 70;

  /* River scale (hue 230 — deep water blue) */
  --lch-river-darkest: 26% 0.06 230;
  --lch-river-darker: 36% 0.08 230;
  --lch-river-dark: 46% 0.10 230;
  --lch-river-medium: 55% 0.09 230;
  --lch-river-light: 70% 0.06 230;
  --lch-river-lighter: 85% 0.035 230;
  --lch-river-lightest: 94% 0.015 230;

  /* Colors: Named */
  --color-paper: oklch(var(--lch-paper));
  --color-ink: oklch(var(--lch-ink));
  --color-graphite: oklch(var(--lch-graphite));
  --color-dust: oklch(var(--lch-dust));
  --color-asphalt: oklch(var(--lch-asphalt));

  /* Wood colors */
  --color-wood: oklch(var(--lch-wood-medium));
  --color-wood-darkest: oklch(var(--lch-wood-darkest));
  --color-wood-darker: oklch(var(--lch-wood-darker));
  --color-wood-dark: oklch(var(--lch-wood-dark));
  --color-wood-medium: oklch(var(--lch-wood-medium));
  --color-wood-light: oklch(var(--lch-wood-light));
  --color-wood-lighter: oklch(var(--lch-wood-lighter));
  --color-wood-lightest: oklch(var(--lch-wood-lightest));

  /* River colors */
  --color-river: oklch(var(--lch-river-dark));
  --color-river-darkest: oklch(var(--lch-river-darkest));
  --color-river-darker: oklch(var(--lch-river-darker));
  --color-river-dark: oklch(var(--lch-river-dark));
  --color-river-medium: oklch(var(--lch-river-medium));
  --color-river-light: oklch(var(--lch-river-light));
  --color-river-lighter: oklch(var(--lch-river-lighter));
  --color-river-lightest: oklch(var(--lch-river-lightest));

  /* Colors: Semantic (mapped to Fizzy conventions) */
  --color-canvas: var(--color-paper);
  --color-ink-inverted: var(--color-paper);
  --color-ink-darkest: var(--color-ink);
  --color-ink-darker: var(--color-asphalt);
  --color-ink-dark: var(--color-graphite);
  --color-ink-medium: oklch(55% 0.008 55);
  --color-ink-light: oklch(75% 0.005 60);
  --color-ink-lighter: var(--color-dust);
  --color-ink-lightest: oklch(95% 0.003 70);

  /* Colors: Abstractions */
  --color-link: var(--color-river);
  --color-accent: var(--color-wood);
  --color-positive: oklch(55% 0.162 147);
  --color-negative: oklch(59% 0.19 38);
  --color-highlight: var(--color-wood-light);
  --color-selected: oklch(var(--lch-river-medium) / 20%);
  --color-selected-light: oklch(var(--lch-river-medium) / 10%);
  --color-selected-dark: oklch(var(--lch-river-medium) / 30%);
  --color-marker: var(--color-negative);

  /* Borders */
  --border: 1px solid var(--color-dust);

  /* Shadows */
  --shadow: 0 0 0 1px oklch(var(--lch-ink) / 5%),
            0 0.2em 0.2em oklch(var(--lch-ink) / 5%),
            0 0.4em 0.4em oklch(var(--lch-ink) / 5%),
            0 0.8em 0.8em oklch(var(--lch-ink) / 5%);

  /* Components */
  --btn-size: 2.65em;

  /* Focus rings */
  --focus-ring-color: var(--color-river);
  --focus-ring-offset: 1px;
  --focus-ring-size: 2px;
  --focus-ring: var(--focus-ring-size) solid var(--focus-ring-color);

  /* Easing */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-overshoot: cubic-bezier(0.25, 1.75, 0.5, 1);

  /* Layout */
  --main-padding: clamp(var(--inline-space), 3vw, calc(var(--inline-space) * 3));
  --main-width: 960px;

  /* Z-index */
  --z-popup: 10;
  --z-nav: 20;
  --z-flash: 30;
  --z-tooltip: 40;
}

/* Dark mode */
html[data-theme="dark"] {
  --lch-paper: 27% 0.006 40;
  --lch-ink: 97% 0.005 70;
  --lch-graphite: 75% 0.008 60;
  --lch-dust: 35% 0.005 50;
  --lch-asphalt: 18% 0.004 35;

  --color-ink-inverted: oklch(var(--lch-asphalt));
  --color-ink-medium: oklch(60% 0.006 55);
  --color-ink-light: oklch(45% 0.005 50);
  --color-ink-lightest: oklch(30% 0.004 45);

  --shadow: 0 0 0 1px oklch(0% 0 0 / 30%),
            0 0.2em 0.4em oklch(0% 0 0 / 20%),
            0 0.4em 0.8em oklch(0% 0 0 / 15%);
}

@media (prefers-color-scheme: dark) {
  html:not([data-theme]) {
    --lch-paper: 27% 0.006 40;
    --lch-ink: 97% 0.005 70;
    --lch-graphite: 75% 0.008 60;
    --lch-dust: 35% 0.005 50;
    --lch-asphalt: 18% 0.004 35;

    --color-ink-inverted: oklch(var(--lch-asphalt));
    --color-ink-medium: oklch(60% 0.006 55);
    --color-ink-light: oklch(45% 0.005 50);
    --color-ink-lightest: oklch(30% 0.004 45);

    --shadow: 0 0 0 1px oklch(0% 0 0 / 30%),
              0 0.2em 0.4em oklch(0% 0 0 / 20%),
              0 0.4em 0.8em oklch(0% 0 0 / 15%);
  }
}