app/src/styles/_variables.css

/* ============================================================================ */
/* Design Tokens */
/* ============================================================================ */
:root {
  /* Neutrals */
  --neutral-600: rgb(107, 114, 128);
  --neutral-400: rgb(185, 185, 185);
  --neutral-300: rgb(228, 228, 228);
  --neutral-200: rgb(245, 245, 245);

  --default-font-family: Source Sans Pro, ui-sans-serif, system-ui, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";

  /* Brand (OKLCH base + derived states) */
  --primary-base: oklch(0.75 0.12 47);
  --primary-color: var(--primary-base);
  --primary-color-hover: oklch(from var(--primary-color) calc(l - 0.05) c h);
  --primary-color-active: oklch(from var(--primary-color) calc(l - 0.10) c h);
  --on-primary: #ffffff;

  /* Text & Surfaces */
  --page-bg: #ffffff;
  --text-color: rgba(0, 0, 0, .85);
  --transparent-page-contrast: rgba(255, 255, 255, .85);
  --muted-color: rgba(0, 0, 0, .6);
  --border-color: rgba(0, 0, 0, .1);
  --surface-bg: #fafafa;
  --code-bg: #f6f8fa;

  /* Links */
  --link-underline: var(--primary-color);
  --link-underline-hover: var(--primary-color-hover);

  /* Spacing scale */
  --spacing-1: 8px;
  --spacing-2: 12px;
  --spacing-3: 16px;
  --spacing-4: 24px;
  --spacing-5: 32px;
  --spacing-6: 40px;
  --spacing-7: 48px;
  --spacing-8: 56px;
  --spacing-9: 64px;
  --spacing-10: 72px;

  /* Custom Media aliases compiled by PostCSS */
  @custom-media --bp-xxs (max-width: 320px);
  @custom-media --bp-xs (max-width: 480px);
  @custom-media --bp-sm (max-width: 640px);
  @custom-media --bp-md (max-width: 768px);
  @custom-media --bp-lg (max-width: 1024px);
  @custom-media --bp-xl (max-width: 1280px);
  @custom-media --bp-content-collapse (max-width: 1100px);

  /* Layout */
  --content-padding-x: 16px;
  /* default page gutter */
  --block-spacing-y: var(--spacing-4);
  /* default vertical spacing between block components */

  /* Config */
  --palette-count: 8;

  /* Button tokens */
  --button-radius: 6px;
  --button-padding-x: 12px;
  --button-padding-y: 8px;
  --button-font-size: 14px;
  --button-icon-padding: 8px;
  /* Big button */
  --button-big-padding-x: 16px;
  --button-big-padding-y: 12px;
  --button-big-font-size: 16px;
  --button-big-icon-padding: 12px;

  /* Table tokens */
  --table-border-radius: 8px;
  --table-header-bg: oklch(from var(--surface-bg) calc(l - 0.02) c h);
  --table-row-odd-bg: oklch(from var(--surface-bg) calc(l - 0.01) c h);

  /* Z-index */
  --z-base: 0;
  --z-content: 1;
  --z-elevated: 10;
  --z-overlay: 1000;
  --z-modal: 1100;
  --z-tooltip: 1200;

  /* Charts (global) */
  --axis-color: var(--muted-color);
  --tick-color: var(--text-color);
  --grid-color: rgba(0, 0, 0, .08);
}

/* ============================================================================ */
/* Dark Theme Overrides */
/* ============================================================================ */
[data-theme="dark"] {
  --page-bg: #0f1115;
  --text-color: rgba(255, 255, 255, .9);
  --muted-color: rgba(255, 255, 255, .7);
  --border-color: rgba(255, 255, 255, .15);
  --surface-bg: #12151b;
  --code-bg: #12151b;
  --transparent-page-contrast: rgba(0, 0, 0, .85);

  /* Charts (global) */
  --axis-color: var(--muted-color);
  --tick-color: var(--muted-color);
  --grid-color: rgba(255, 255, 255, .10);

  /* Primary (lower L in dark) */
  --primary-color-hover: oklch(from var(--primary-color) calc(l - 0.05) c h);
  --primary-color-active: oklch(from var(--primary-color) calc(l - 0.10) c h);
  --on-primary: #0f1115;

  color-scheme: dark;
  background: var(--page-bg);
}