/* Hallmark · genre: atmospheric · macrostructure: Index-First · theme: Midnight
 * nav: N5 Floating pill (content-sized / blur+saturate / top-centred) · footer: Ft5 Statement
 * enrichment: none (typography only) · audience: 中文工具站访客 · use: 三站导航索引 · tone: atmospheric/technical
 * pre-emit critique: P5 H5 E5 S4 R5 V5
 */

:root {
  /* ---- colour (Midnight, anchor hue 270, warm amber accent) ---- */
  --color-paper:   oklch(14% 0.012 270);
  --color-paper-2: oklch(18% 0.014 270);
  --color-paper-3: oklch(22% 0.016 270);
  --color-rule:    oklch(28% 0.014 270);
  --color-neutral: oklch(60% 0.012 270);
  --color-muted:   oklch(74% 0.010 270);
  --color-ink:     oklch(94% 0.008 270);
  --color-accent:  oklch(78% 0.16 65);
  --color-focus:   oklch(70% 0.17 65);

  /* ---- type ---- */
  --font-display: "Geist", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body:    "Geist", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono:    "Geist Mono", ui-monospace, "SF Mono", "Cascadia Mono", monospace;

  --text-xs:   0.8rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-md:   1.25rem;
  --text-lg:   clamp(1.4rem, 1rem + 1.2vw, 1.75rem);
  --text-display: clamp(1.75rem, 1.2rem + 2.4vw, 2.5rem);

  /* ---- space (4pt) ---- */
  --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;

  --page-gutter: clamp(1rem, 4vw, 1.5rem);
  --measure: 62ch;

  /* ---- rules / radius / depth ---- */
  --rule-hair: 1px;
  --radius-pill: 999px;
  --shadow-whisper: 0 1px 2px oklch(20% 0.01 270 / 0.05);

  /* ---- motion ---- */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in:  cubic-bezier(0.7, 0, 0.84, 0);
  --dur-micro: 120ms;
  --dur-short: 220ms;
  --dur-long:  420ms;

  /* ---- z ---- */
  --z-sticky: 200;
}