:root {
  --color-paper: oklch(0% 0 0);
  --color-paper-warm: oklch(0% 0 0);
  --color-paper-soft: oklch(0% 0 0);
  --color-surface: oklch(17% 0.012 255);
  --color-surface-muted: oklch(21% 0.014 255);
  --color-ink: oklch(94% 0.008 250);
  --color-ink-soft: oklch(81% 0.01 250);
  --color-muted: oklch(67% 0.012 252);
  --color-rule: oklch(29% 0.014 254);
  --color-metal: oklch(57% 0.012 250);
  --color-metal-dark: oklch(72% 0.012 250);
  --color-accent: oklch(67% 0.18 255);
  --color-accent-ink: oklch(98% 0.004 250);
  --color-accent-hover: oklch(72% 0.17 255);
  --color-accent-soft: oklch(27% 0.06 255);
  --color-sage: oklch(69% 0.04 235);
  --color-sage-soft: oklch(24% 0.025 240);
  --color-focus: oklch(72% 0.17 255);
  --color-error: oklch(70% 0.13 28);
  --color-success: oklch(70% 0.09 145);
  --color-shadow: oklch(0% 0 0 / 0.45);
  --color-shadow-soft: oklch(0% 0 0 / 0.25);

  --font-display: "Space Grotesk", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Inter", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  --font-wordmark: "Space Grotesk", "PingFang SC", "Microsoft YaHei", sans-serif;

  --space-2xs: 0.25rem;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4.5rem;
  --space-4xl: 5.5rem;
  --space-5xl: 7.5rem;

  --section-space-desktop: clamp(10rem, 13vw, 13.75rem);
  --section-space-tablet: clamp(7.5rem, 12vw, 10rem);
  --section-space-mobile: clamp(5.5rem, 22vw, 7.5rem);
  --visual-gap: clamp(4.5rem, 8vw, 7.5rem);
  --visual-surface: var(--color-surface);
  --visual-surface-alt: var(--color-paper-soft);

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-md: 1.25rem;
  --text-lg: 1.375rem;
  --text-xl: 1.75rem;
  --text-2xl: 2.125rem;
  --text-3xl: 2.625rem;
  --text-display-s: clamp(2.35rem, 4vw, 3.95rem);
  --text-display: clamp(2.75rem, 5.8vw, 5.4rem);

  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-pill: 999px;

  --rule-hair: 1px;
  --page-max: 88rem;
  --page-gutter: clamp(1.25rem, 4vw, 4.5rem);
  --content-max: calc(var(--page-max) - (2 * var(--page-gutter)));
  --nav-height: 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-fast: 140ms;
  --dur-mid: 420ms;
  --dur-slow: 700ms;
}