@layer reset, base, components, utilities;

:root {
  /* 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 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
  --font-serif: ui-serif, serif;
  --font-mono: ui-monospace, monospace;

  --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;
  }

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

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

  /* Components */
  --btn-size: 2.65em;
  --footer-height: 2.65rem;
  --header-height: 3.5rem;

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

  /* Dialogs */
  --dialog-duration: 150ms;

  /* Easing */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-overshoot: cubic-bezier(0.25, 1.75, 0.5, 1);
  --ease-out-overshoot-subtle: cubic-bezier(0.25, 1.25, 0.5, 1);

  /* Layout */
  --main-padding: clamp(var(--inline-space), 3vw, calc(var(--inline-space) * 3));
  --main-width: 1200px;

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

  /* OKLCH colors: Fixed */
  --lch-black: 0% 0 0;
  --lch-white: 100% 0 0;

  /* OKLCH colors: Light mode */
  --lch-canvas: var(--lch-white);
  --lch-ink-inverted: var(--lch-white);

  --lch-ink-darkest: 26% 0.05 264;
  --lch-ink-darker: 40% 0.026 262;
  --lch-ink-dark: 56% 0.014 260;
  --lch-ink-medium: 66% 0.008 258;
  --lch-ink-light: 84% 0.005 256;
  --lch-ink-lighter: 92% 0.003 254;
  --lch-ink-lightest: 96% 0.002 252;

  --lch-red-darkest: 26% 0.105 34;
  --lch-red-darker: 40% 0.154 36;
  --lch-red-dark: 59% 0.19 38;
  --lch-red-medium: 66% 0.204 40;
  --lch-red-light: 84.08% 0.0837 41.96;
  --lch-red-lighter: 92% 0.03 44;
  --lch-red-lightest: 96% 0.013 46;

  --lch-yellow-darkest: 26% 0.0729 40;
  --lch-yellow-darker: 40% 0.12 50;
  --lch-yellow-dark: 58% 0.156 60;
  --lch-yellow-medium: 74% 0.184 70;
  --lch-yellow-light: 84% 0.12 80;
  --lch-yellow-lighter: 92% 0.076 90;
  --lch-yellow-lightest: 96% 0.034 100;

  --lch-green-darkest: 26% 0.071 149;
  --lch-green-darker: 40% 0.12 148;
  --lch-green-dark: 55% 0.162 147;
  --lch-green-medium: 66% 0.208 146;
  --lch-green-light: 83.92% 0.0772 145.06;
  --lch-green-lighter: 92% 0.044 144;
  --lch-green-lightest: 96% 0.022 143;

  --lch-blue-darkest: 26% 0.126 264;
  --lch-blue-darker: 40% 0.166 262;
  --lch-blue-dark: 57.02% 0.1895 260.46;
  --lch-blue-medium: 66% 0.196 257.82;
  --lch-blue-light: 84.04% 0.0719 255.29;
  --lch-blue-lighter: 92% 0.026 254;
  --lch-blue-lightest: 96% 0.016 252;

  --lch-purple-darkest: 26% 0.131 314;
  --lch-purple-darker: 40% 0.178 312;
  --lch-purple-dark: 58% 0.21 310;
  --lch-purple-medium: 66% 0.258 308;
  --lch-purple-light: 84.09% 0.0778 305.77;
  --lch-purple-lighter: 92% 0.03 304;
  --lch-purple-lightest: 96% 0.019 302;

  /* Colors: Named */
  --color-black: oklch(var(--lch-black));
  --color-white: oklch(var(--lch-white));

  --color-ink: oklch(var(--lch-ink-darkest));
  --color-ink-darkest: oklch(var(--lch-ink-darkest));
  --color-ink-darker: oklch(var(--lch-ink-darker));
  --color-ink-dark: oklch(var(--lch-ink-dark));
  --color-ink-medium: oklch(var(--lch-ink-medium));
  --color-ink-light: oklch(var(--lch-ink-light));
  --color-ink-lighter: oklch(var(--lch-ink-lighter));
  --color-ink-lightest: oklch(var(--lch-ink-lightest));
  --color-ink-inverted: oklch(var(--lch-ink-inverted));

  /* Colors: Semantic */
  --color-canvas: oklch(var(--lch-canvas));
  --color-negative: oklch(var(--lch-red-dark));
  --color-negative-subtle: oklch(var(--lch-red-lightest));
  --color-positive: oklch(var(--lch-green-dark));
  --color-link: oklch(var(--lch-blue-dark));
  --color-selected-light: oklch(var(--lch-blue-lightest));
  --color-selected: oklch(var(--lch-blue-lighter));
  --color-selected-dark: oklch(var(--lch-blue-light));
  --color-highlight: oklch(var(--lch-yellow-lighter));
  --color-marker: oklch(var(--lch-red-medium));
}

/* Dark mode — explicit choice overrides system preference */
html[data-theme="dark"] {
  --lch-canvas: 20% 0.0195 232.58;
  --lch-ink-inverted: var(--lch-black);

  --lch-ink-darkest: 96.02% 0.0034 260;
  --lch-ink-darker: 86% 0.0061 260;
  --lch-ink-dark: 73.97% 0.009 260;
  --lch-ink-medium: 62% 0.0122 260;
  --lch-ink-light: 40% 0.0148 260;
  --lch-ink-lighter: 30% 0.0178 260;
  --lch-ink-lightest: 25% 0.0204 260;

  --lch-red-dark: 73.95% 0.139 42;
  --lch-red-medium: 62% 0.154 40;
  --lch-red-lightest: 26% 0.045 40;
  --lch-yellow-dark: 74.06% 0.136 80;
  --lch-yellow-lighter: 30% 0.026 50;
  --lch-green-dark: 73.99% 0.117 145;
  --lch-blue-dark: 74% 0.1293 256;
  --lch-blue-light: 40% 0.094 260;
  --lch-blue-lighter: 30% 0.0452 262;
  --lch-blue-lightest: 25% 0.0318 264;
  --lch-purple-dark: 73.98% 0.141 306;

  --shadow: 0 0 0 1px oklch(var(--lch-black) / 0.42),
    0 0.2em 1.6em -0.8em oklch(var(--lch-black) / 0.6),
    0 0.4em 2.4em -1em oklch(var(--lch-black) / 0.7),
    0 0.8em 1.2em -1.6em oklch(var(--lch-black) / 1);
}

/* Fallback to system preference when no explicit theme is set */
@media (prefers-color-scheme: dark) {
  html:not([data-theme]) {
    --lch-canvas: 20% 0.0195 232.58;
    --lch-ink-inverted: var(--lch-black);

    --lch-ink-darkest: 96.02% 0.0034 260;
    --lch-ink-darker: 86% 0.0061 260;
    --lch-ink-dark: 73.97% 0.009 260;
    --lch-ink-medium: 62% 0.0122 260;
    --lch-ink-light: 40% 0.0148 260;
    --lch-ink-lighter: 30% 0.0178 260;
    --lch-ink-lightest: 25% 0.0204 260;

    --lch-red-dark: 73.95% 0.139 42;
    --lch-red-medium: 62% 0.154 40;
    --lch-red-lightest: 26% 0.045 40;
    --lch-yellow-dark: 74.06% 0.136 80;
    --lch-yellow-lighter: 30% 0.026 50;
    --lch-green-dark: 73.99% 0.117 145;
    --lch-blue-dark: 74% 0.1293 256;
    --lch-blue-light: 40% 0.094 260;
    --lch-blue-lighter: 30% 0.0452 262;
    --lch-blue-lightest: 25% 0.0318 264;
    --lch-purple-dark: 73.98% 0.141 306;

    --shadow: 0 0 0 1px oklch(var(--lch-black) / 0.42),
              0 .2em 1.6em -0.8em oklch(var(--lch-black) / 0.6),
              0 .4em 2.4em -1em oklch(var(--lch-black) / 0.7),
              0 .8em 1.2em -1.6em oklch(var(--lch-black) / 1);
  }
}