/* ============================================================
   Hallmark · genre: editorial · macrostructure: Specimen
   theme: Newsprint (self-built OKLCH) · enrichment: none
   nav: N6 masthead (single-page) · footer: Ft4 colophon
   tone: 书卷气 · audience: 考研学生 · use: 真题刷题与错题复盘
   ============================================================ */

:root {
  /* ---- Paper band: light 暖米纸 ---- */
  --color-paper:      oklch(97% 0.008 70);
  --color-paper-2:    oklch(94% 0.010 70);
  --color-paper-3:    oklch(91% 0.012 70);

  /* ---- Ink: 暖墨 ---- */
  --color-ink:        oklch(22% 0.015 45);
  --color-ink-2:      oklch(38% 0.015 50);
  --color-muted:      oklch(52% 0.015 55);

  /* ---- Hairlines ---- */
  --color-rule:       oklch(86% 0.010 70);
  --color-rule-2:     oklch(76% 0.014 60);

  /* ---- Accent: 朱红印刷墨 ---- */
  --color-accent:     oklch(52% 0.16 35);
  --color-accent-2:   oklch(60% 0.15 40);
  --color-focus:      oklch(55% 0.19 55);

  /* ---- Semantic ---- */
  --color-ok:         oklch(52% 0.12 150);
  --color-bad:        oklch(52% 0.17 28);

  /* ---- 科目墨色（低饱和，保持印刷感）---- */
  --cm1: oklch(45% 0.08 240);
  --cm2: oklch(45% 0.09 300);
  --cm3: oklch(45% 0.10 75);

  /* ---- Type: 中文宋体栈 + 西文衬线 outlier（全离线）---- */
  --font-display: "Songti SC", "STSong", "Noto Serif SC", "SimSun", Georgia, serif;
  --font-body:    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", "WenQuanYi Micro Hei", sans-serif;
  --font-outlier: Georgia, "Times New Roman", "PingFang SC", serif;

  /* ---- 4pt spacing scale ---- */
  --space-3xs: 0.25rem;  --space-2xs: 0.5rem;  --space-xs: 0.75rem;
  --space-sm:  1rem;     --space-md:  1.5rem;  --space-lg: 2rem;
  --space-xl:  3rem;     --space-2xl: 4.5rem;  --space-3xl: 7rem;

  /* ---- Type scale: major third 1.25 ---- */
  --text-xs:   0.75rem;  --text-sm:   0.875rem; --text-md:   1.125rem;
  --text-lg:   1.375rem; --text-xl:   1.75rem;  --text-2xl:  2.25rem;
  --text-3xl:  2.8125rem; --text-display: clamp(2.5rem, 6vw, 4rem);
  --text-display-s: clamp(1.75rem, 4vw, 2.5rem);

  /* ---- Motion ---- */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in:  cubic-bezier(0.4, 0, 1, 1);
  --dur-short: 160ms;  --dur-med: 260ms;  --dur-long: 500ms;

  /* ---- Radius: 纸张无圆角或微圆角 ---- */
  --radius-sm: 2px;  --radius-md: 4px;
}