/* Hallmark · genre: editorial · theme: Almanac (light paper · warm neutrals · oxblood accent · scholarly serif display)
 * tokens.css — shared design tokens for paper.linxiexie.com
 * axes: paper-band=light · display-style=roman-serif · accent-hue=warm(25)
 */

@font-face {
  font-family: "Fraunces";
  src: url("/assets/fonts/fraunces-400.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Fraunces";
  src: url("/assets/fonts/fraunces-600.woff2") format("woff2");
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Sans";
  src: url("/assets/fonts/plexsans-400.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Sans";
  src: url("/assets/fonts/plexsans-600.woff2") format("woff2");
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "JetBrains Mono";
  src: url("/assets/fonts/jbmono-400.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

:root {
  /* —— colour · Almanac:陈年纸 + 墨 + 牛血红点缀 —— */
  --color-paper:    oklch(96.5% 0.012 85);
  --color-paper-2:  oklch(93.8% 0.014 85);
  --color-rule:     oklch(84%   0.014 85);
  --color-neutral:  oklch(50%   0.012 80);
  --color-muted:    oklch(38%   0.012 75);
  --color-ink:      oklch(22%   0.014 60);
  --color-accent:   oklch(44%   0.13  25);   /* oxblood */
  --color-accent-soft: oklch(90% 0.03 25);
  --color-focus:    oklch(52%   0.16  25);

  /* 图示内容色:透射层(暖红)/反射层(冷蓝),跟论文原图的红蓝约定一致 */
  --color-diagram-t:      oklch(58% 0.17 25);
  --color-diagram-r:      oklch(52% 0.13 250);
  --color-diagram-t-soft: oklch(88% 0.05 25);
  --color-diagram-r-soft: oklch(88% 0.04 250);

  /* —— type —— */
  --font-display: "Fraunces", "Songti SC", "Noto Serif SC", "STSong", "SimSun", ui-serif, serif;
  --font-body: "IBM Plex Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: "JetBrains Mono", "PingFang SC", ui-monospace, "SF Mono", Menlo, monospace;

  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-md:   1.1875rem;
  --text-lg:   1.4375rem;
  --text-xl:   1.75rem;
  --text-2xl:  2.25rem;
  --text-3xl:  2.875rem;
  --text-display: clamp(2.25rem, 4vw + 1rem, 3.75rem);

  /* —— 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;

  /* —— rules & radii —— */
  --rule-hair: 1px;
  --radius-sm: 3px;

  /* —— motion(Almanac 0.85×,工具书式的干脆)—— */
  --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: 100ms;
  --dur-short: 190ms;
  --dur-long:  360ms;

  /* —— z scale —— */
  --z-base: 1;
  --z-raised: 10;
  --z-sticky: 200;
}

html { overflow-x: clip; }
body {
  overflow-x: clip;
  margin: 0;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  padding-inline: max(0px, env(safe-area-inset-left));
}

:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
}

::selection { background: var(--color-accent-soft); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 150ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 150ms !important;
  }
}