:root {
  --color-paper: oklch(97% 0.009 170);
  --color-paper-raised: oklch(99% 0.007 170);
  --color-paper-sunken: oklch(93% 0.015 170);
  --color-ink: oklch(20% 0.018 180);
  --color-ink-soft: oklch(39% 0.018 180);
  --color-muted: oklch(42% 0.016 180);
  --color-rule: oklch(82% 0.015 175);
  --color-rule-strong: oklch(66% 0.025 175);
  --color-accent: oklch(45% 0.105 178);
  --color-accent-strong: oklch(35% 0.09 178);
  --color-accent-soft: oklch(90% 0.035 172);
  --color-accent-ink: oklch(98% 0.008 170);
  --color-inverse-surface: oklch(22% 0.02 180);
  --color-inverse-ink: oklch(96% 0.009 170);
  --color-inverse-muted: oklch(80% 0.014 175);
  --color-focus: oklch(58% 0.15 175);
  --color-overlay: oklch(12% 0.018 180 / 0.72);
  --color-shadow: oklch(18% 0.03 180 / 0.09);
  --font-display: "Newsreader", "Songti SC", "STSong", serif;
  --font-body: "IBM Plex Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --space-3xs: 0.125rem;
  --space-2xs: 0.25rem;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2.5rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  --space-4xl: 9rem;
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-md: 1.25rem;
  --text-lg: 1.5625rem;
  --text-xl: 1.953rem;
  --text-2xl: 2.441rem;
  --text-3xl: 3.052rem;
  --text-4xl: 3.815rem;
  --text-display: clamp(3rem, 5vw + 1rem, 5.25rem);
  --text-display-small: clamp(2.5rem, 4vw + 0.75rem, 4.5rem);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in: cubic-bezier(0.7, 0, 0.84, 0);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --dur-micro: 120ms;
  --dur-short: 220ms;
  --dur-long: 420ms;
  --rule-hairline: 1px;
  --radius-small: 0.375rem;
  --radius-panel: 0.75rem;
  --radius-round: 999rem;
  --shadow-whisper: 0 1px 2px var(--color-shadow);
  --page-gutter: clamp(1.125rem, 4vw, 4rem);
  --content-max: 78rem;
  --z-base: 1;
  --z-raised: 10;
  --z-sticky: 200;
}

:root[data-theme="dark"] {
  --color-paper: oklch(14% 0.012 180);
  --color-paper-raised: oklch(18% 0.015 180);
  --color-paper-sunken: oklch(11% 0.011 180);
  --color-ink: oklch(94% 0.008 170);
  --color-ink-soft: oklch(77% 0.012 175);
  --color-muted: oklch(72% 0.014 175);
  --color-rule: oklch(30% 0.018 180);
  --color-rule-strong: oklch(45% 0.025 178);
  --color-accent: oklch(75% 0.105 172);
  --color-accent-strong: oklch(82% 0.095 170);
  --color-accent-soft: oklch(23% 0.04 178);
  --color-accent-ink: oklch(14% 0.015 180);
  --color-inverse-surface: oklch(91% 0.01 170);
  --color-inverse-ink: oklch(16% 0.015 180);
  --color-inverse-muted: oklch(38% 0.016 180);
  --color-focus: oklch(78% 0.13 170);
  --color-overlay: oklch(8% 0.014 180 / 0.82);
  --color-shadow: oklch(5% 0.01 180 / 0.28);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-paper: oklch(14% 0.012 180);
    --color-paper-raised: oklch(18% 0.015 180);
    --color-paper-sunken: oklch(11% 0.011 180);
    --color-ink: oklch(94% 0.008 170);
    --color-ink-soft: oklch(77% 0.012 175);
    --color-muted: oklch(72% 0.014 175);
    --color-rule: oklch(30% 0.018 180);
    --color-rule-strong: oklch(45% 0.025 178);
    --color-accent: oklch(75% 0.105 172);
    --color-accent-strong: oklch(82% 0.095 170);
    --color-accent-soft: oklch(23% 0.04 178);
    --color-accent-ink: oklch(14% 0.015 180);
    --color-inverse-surface: oklch(91% 0.01 170);
    --color-inverse-ink: oklch(16% 0.015 180);
    --color-inverse-muted: oklch(38% 0.016 180);
    --color-focus: oklch(78% 0.13 170);
    --color-overlay: oklch(8% 0.014 180 / 0.82);
    --color-shadow: oklch(5% 0.01 180 / 0.28);
  }
}