/* ==========================================================================
   四季官方网址 · 共享样式 /assets/site.css
   骨架：黑白高对比 + 赭红锚点 + 四季分色分区
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; }
img, svg, video, picture { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, h5, p, figure, blockquote { margin: 0; }
button { background: none; border: 0; }
table { border-collapse: collapse; }

/* ---------- 2. Tokens ---------- */
:root {
  --ink: #101418;
  --paper: #F7F4EE;
  --snow: #FFFFFF;
  --ochre: #B4472F;
  --ochre-deep: #9C3A25;
  --amber: #E07B39;
  --barley: #7FB069;
  --gold: #E4B363;
  --glacier: #2F7F9E;
  --turquoise: #2FA88C;
  --indigo: #1B2A49;

  --line: rgba(16, 20, 24, .14);
  --line-strong: rgba(16, 20, 24, .30);
  --ink-70: rgba(16, 20, 24, .72);
  --ink-50: rgba(16, 20, 24, .52);

  --font-display: "Source Han Serif SC", "Noto Serif SC", "Songti SC", "STSong", "SimSun", Georgia, "Times New Roman", serif;
  --font-body: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 40px;
  --space-5: 64px;
  --space-6: 96px;
  --space-7: 160px;

  --radius-s: 10px;
  --radius-m: 20px;
  --radius-l: 32px;
  --radius-pill: 999px;

  --header-h: 76px;
  --rail-w: 44px;
  --wrap: 1180px;
  --max-read: 68ch;
}

@media (max-width: 999px) {
  :root { --header-h: 64px; }
}

/* ---------- 3. Base & 中文排版 ---------- */
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -.01em;
  line-height: 1.16;
}

h1 { font-size: clamp(34px, 5.2vw, 72px); line-height: 1.06; }
h2 { font-size: clamp(26px, 3.2vw, 44px); }
h3 { font-size: clamp(20px, 2.2vw, 28px); }
h4 { font-size: 19px; }

.display-1 { font-family: var(--font-display); font-weight: 700; font-size: clamp(40px, 7vw, 96px); line-height: 1.02; letter-spacing: -.01em; }
.display-2 { font-family: var(--font-display); font-weight: 700; font-size: clamp(32px, 4.6vw, 60px); line-height: 1.08; letter-spacing: -.01em; }
.display-3 { font-family: var(--font-display); font-weight: 700; font-size: clamp(25px, 3vw, 40px); line-height: 1.14; letter-spacing: -.01em; }

p { font-size: 17px; line-height: 1.75; letter-spacing: .01em; }
.prose { max-width: var(--max-read); }
.prose p + p { margin-top: var(--space-2); }
.prose h2 { margin-top: var(--space-5); }
.prose h3 { margin-top: var(--space-4); }
.prose ul { margin-top: var(--space-2); }
.prose li { position: relative; padding-left: 20px; margin-top: 8px; }
.prose li::before { content: ""; position: absolute; left: 2px; top: .78em; width: 6px; height: 6px; border-radius: 50%; background: var(--ochre); }
.prose a { color: var(--ochre); border-bottom: 1px solid rgba(180, 71, 47, .35); }
.prose a:hover { border-bottom-color: var(--ochre); }

.eyebrow {
  display: inline-block;
  font-size: 12.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-50);
  font-variant-numeric: tabular-nums;
}
.meta-num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; letter-spacing: .02em; }

.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0 0 0 0); clip-path: inset(50%);
  white-space: nowrap; border: 0;
}

/* ---------- 4. 焦点与跳转 ---------- */
:focus-visible {
  outline: 2px solid var(--ochre);
  outline-offset: 3px;
  border-radius: 4px;
}
.skip-link {
  position: absolute;
  left: 16px; top: -72px;
  z-index: 200;
  padding: 11px 20px;
  background: var(--ink);
  color: var(--paper);
  font-size: 14px;
  border-radius: 0 0 var(--radius-s) var(--radius-s);
  transition: top .16s ease;
}
.skip-link:focus { top: 0; }

#main-content { scroll-margin-top: calc(var(--header-h) + 20px); }

/* ---------- 5. 布局原语 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 40px);
}
.section { padding-block: clamp(48px, 8vw, 96px); }
.section--wide { padding-block: clamp(64px, 12vw, 160px); }
.section--tight { padding-block: clamp(32px, 5vw, 56px); }

.grid { display: grid; gap: var(--space-3); }
.grid-12 { display: grid; gap: var(--space-3); grid-template-columns: repeat(12, minmax(0, 1fr)); }
.col-note { grid-column: 1 / span 3; }
.col-body { grid-column: 4 / span 8; }
.col-aside { grid-column: 10 / span 3; }

@media (max-width: 1023px) {
  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .col-note, .col-body { grid-column: 1 / span 6; }
  .col-aside { grid-column: 1 / span 6; }
}

.rule { height: 1px; border: 0; background: var(--line); margin: 0; }
.rule--season {
  height: 3px;
  border: 0;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--barley), var(--glacier) 38%, var(--amber) 70%, var(--indigo));
  opacity: .85;
}

/* ---------- 6. 季节色协议 ---------- */
.season-spring { --season: #7FB069; --season-soft: rgba(127, 176, 105, .18); --season-deep: #E4B363; }
.season-summer { --season: #2F7F9E; --season-soft: rgba(47, 127, 158, .16); --season-deep: #2FA88C; }
.season-autumn { --season: #B4472F; --season-soft: rgba(180, 71, 47, .13); --season-deep: #E07B39; }
.season-winter { --season: #1B2A49; --season-soft: rgba(27, 42, 73, .12); --season-deep: #4A6CA8; }

.tag {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 11px;
  border-radius: var(--radius-pill);
  font-size: 12.5px; letter-spacing: .05em;
  background: rgba(16, 20, 24, .06);
  color: var(--ink-70);
}
.tag--accent { background: rgba(180, 71, 47, .11); color: var(--ochre); }
.tag--season { background: var(--season-soft, rgba(16, 20, 24, .06)); color: var(--season, var(--ink)); }

/* ---------- 7. 通用按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  min-height: 48px; padding: 0 26px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-size: 16px; font-weight: 600; letter-spacing: .02em;
  cursor: pointer;
  transition: background-color .16s ease, color .16s ease, border-color .16s ease, transform .16s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--ochre); color: var(--snow); }
.btn-primary:hover { background: var(--ochre-deep); }
.btn-ghost { border-color: rgba(16, 20, 24, .22); color: var(--ink); }
.btn-ghost:hover { border-color: var(--ink); background: rgba(16, 20, 24, .05); }
.btn-sm { min-height: 38px; padding: 0 18px; font-size: 14px; }

/* ---------- 8. 头部框架 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  transition: box-shadow .2s ease;
}
.site-header[data-condensed] { box-shadow: 0 10px 26px rgba(16, 20, 24, .07); }

.header-bar { background: var(--paper); }
.header-inner {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.6vw, 40px);
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 40px);
  min-height: var(--header-h);
  transition: min-height .22s ease;
}
.site-header[data-condensed] .header-inner { min-height: 56px; }

/* 品牌 */
.brand { display: flex; align-items: center; gap: 12px; flex: none; }
.brand-mark {
  position: relative;
  width: 26px; height: 26px; flex: none;
  border-radius: 50%;
  background: conic-gradient(from 45deg,
    var(--barley) 0 25%,
    var(--glacier) 0 50%,
    var(--amber) 0 75%,
    var(--indigo) 0 100%);
}
.brand-mark::after {
  content: "";
  position: absolute; inset: 7px;
  border-radius: 50%;
  background: var(--paper);
}
.brand-mark--light::after { background: var(--indigo); }
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-name { font-family: var(--font-display); font-weight: 700; font-size: 17px; letter-spacing: -.01em; }
.brand-meta { font-size: 11px; letter-spacing: .1em; color: var(--ink-50); font-variant-numeric: tabular-nums; }
.brand-ver {
  padding: 3px 9px;
  border: 1px solid rgba(16, 20, 24, .2);
  border-radius: var(--radius-pill);
  font-size: 11px; letter-spacing: .08em;
  color: var(--ink-50);
  font-variant-numeric: tabular-nums;
}

/* 主导航 */
.site-nav { display: flex; align-items: center; margin-inline-start: auto; }
.nav-list { display: flex; align-items: center; gap: 2px; }
.nav-link {
  position: relative;
  display: inline-flex; align-items: center;
  height: 38px; padding: 0 14px;
  border-radius: var(--radius-pill);
  font-size: 15px;
  color: var(--ink-70);
  transition: background-color .16s ease, color .16s ease;
}
.nav-link:hover { background: rgba(16, 20, 24, .06); color: var(--ink); }
.nav-link[aria-current="page"] {
  color: var(--ochre);
  background: rgba(180, 71, 47, .10);
  font-weight: 600;
}
.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute; left: 50%; bottom: 3px;
  width: 14px; height: 2px; border-radius: 2px;
  background: var(--ochre);
  transform: translateX(-50%);
}
.nav-extras { display: none; }

/* 头部胶囊 */
.header-actions { display: flex; align-items: center; gap: 8px; margin-inline-start: 6px; }
.pill {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  height: 38px; padding: 0 16px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-size: 14px; line-height: 1;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color .16s ease, color .16s ease, border-color .16s ease, transform .16s ease;
}
.pill:active { transform: translateY(1px); }
.pill-ghost { border-color: rgba(16, 20, 24, .18); color: var(--ink); }
.pill-ghost:hover { background: rgba(16, 20, 24, .06); border-color: rgba(16, 20, 24, .32); }
.pill-accent { background: var(--ochre); color: var(--snow); border-color: var(--ochre); }
.pill-accent:hover { background: var(--ochre-deep); border-color: var(--ochre-deep); }
.pill-count {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 18px; height: 18px; padding: 0 5px;
  border-radius: var(--radius-pill);
  background: var(--ochre); color: var(--snow);
  font-size: 11px; font-variant-numeric: tabular-nums; letter-spacing: 0;
}
.pill-icon { position: relative; width: 12px; height: 12px; border: 1.5px solid currentColor; border-radius: 3px; }
.pill-icon::after {
  content: "";
  position: absolute; left: 3px; top: 3px; right: -4px; bottom: -4px;
  border: 1.5px solid currentColor; border-radius: 3px; opacity: .5;
}

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  align-items: center; gap: 10px;
  margin-inline-start: auto;
  height: 40px; padding: 0 14px;
  border: 1px solid rgba(16, 20, 24, .18);
  border-radius: var(--radius-pill);
  font-size: 13px; letter-spacing: .08em;
  cursor: pointer;
}
.nav-toggle-bars { display: flex; flex-direction: column; gap: 5px; width: 18px; }
.nav-toggle-bars span { display: block; height: 2px; background: currentColor; border-radius: 2px; transition: transform .2s ease; }
.nav-toggle[aria-expanded="true"] { border-color: var(--ochre); color: var(--ochre); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:first-child { transform: translateY(3.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:last-child { transform: translateY(-3.5px) rotate(-45deg); }

/* 左侧刻度尺 */
.frame-rail {
  position: fixed;
  left: 0;
  top: var(--header-h);
  bottom: 0;
  width: var(--rail-w);
  display: none;
  z-index: 30;
  pointer-events: none;
}
.rail-line { position: absolute; right: 0; top: 0; bottom: 0; width: 1px; background: var(--line); }
.rail-progress {
  position: absolute; right: -1px; top: 0;
  width: 3px; height: 0;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--barley) 0%, var(--glacier) 36%, var(--amber) 70%, var(--indigo) 100%);
}
.rail-ticks {
  position: absolute; inset: 0;
  background-image: repeating-linear-gradient(to bottom, var(--line-strong) 0 1px, transparent 1px 32px);
  background-repeat: no-repeat;
  background-size: 13px 100%;
  background-position: right center;
  opacity: .55;
}
@media (min-width: 1280px) {
  .frame-rail { display: block; }
}

/* ---------- 9. 移动导航面板 ---------- */
@media (max-width: 999px) {
  .nav-toggle { display: inline-flex; }
  .header-actions { display: none; }

  .site-nav {
    position: fixed;
    left: 0; right: 0;
    top: var(--header-h);
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    padding: 16px clamp(16px, 4vw, 40px) 32px;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 22px 40px rgba(16, 20, 24, .10);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    pointer-events: none;
    transition: opacity .18s ease, transform .18s ease, visibility .18s linear;
  }
  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: none;
    pointer-events: auto;
  }
  .nav-list { flex-direction: column; align-items: stretch; gap: 0; }
  .nav-link {
    height: auto;
    padding: 15px 2px;
    border-radius: 0;
    border-bottom: 1px solid var(--line);
    font-size: 19px;
    font-family: var(--font-display);
    font-weight: 700;
  }
  .nav-link[aria-current="page"] { background: none; }
  .nav-link[aria-current="page"]::after { left: 2px; bottom: 8px; transform: none; width: 22px; }
  .nav-extras {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px dashed var(--line-strong);
  }
}

@media (max-width: 560px) {
  .brand-meta, .brand-ver { display: none; }
  .nav-toggle-text { display: none; }
  .nav-toggle { padding: 0 12px; }
}

/* ---------- 10. 页脚 ---------- */
.site-footer {
  background: var(--indigo);
  color: rgba(255, 255, 255, .78);
  margin-top: var(--space-6);
}
.footer-inner {
  max-width: var(--wrap);
  margin-inline: auto;
  padding: clamp(48px, 7vw, 88px) clamp(20px, 4vw, 40px) 32px;
}
.footer-top {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px 32px;
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(255, 255, 255, .16);
}
.footer-brand { display: inline-flex; align-items: center; gap: 12px; }
.footer-brand-name { font-family: var(--font-display); font-weight: 700; font-size: clamp(22px, 2.6vw, 30px); color: var(--snow); letter-spacing: -.01em; }
.footer-tagline { flex: 1 1 320px; font-size: 15px; line-height: 1.7; color: rgba(255, 255, 255, .72); }

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 32px 28px;
  padding-block: 40px;
}
.footer-title {
  font-size: 12.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, .55);
  margin-bottom: 16px;
  font-variant-numeric: tabular-nums;
}
.footer-list { display: flex; flex-direction: column; gap: 11px; }
.footer-list--plain { gap: 12px; }
.footer-list--plain li { display: flex; gap: 10px; font-size: 14.5px; line-height: 1.6; }
.footer-key {
  flex: none;
  min-width: 34px;
  color: rgba(255, 255, 255, .5);
  font-size: 12.5px;
  letter-spacing: .08em;
  padding-top: 2px;
}
.footer-link {
  display: inline-flex; align-items: center; gap: 9px;
  font-size: 15px;
  color: rgba(255, 255, 255, .78);
  transition: color .16s ease;
  text-align: left;
}
.footer-link:hover { color: var(--amber); }
.footer-link--button { cursor: pointer; padding: 0; border: 0; background: none; font: inherit; font-size: 15px; }
.season-dot { width: 9px; height: 9px; border-radius: 50%; flex: none; }
.season-dot--spring { background: var(--barley); }
.season-dot--summer { background: var(--glacier); }
.season-dot--autumn { background: var(--amber); }
.season-dot--winter { background: #8397C4; }
.footer-note { font-size: 14px; line-height: 1.7; color: rgba(255, 255, 255, .66); }
.footer-note--small { margin-top: 14px; font-size: 13px; color: rgba(255, 255, 255, .55); }
.footer-meta { font-size: 12.5px; letter-spacing: .08em; color: rgba(255, 255, 255, .5); font-variant-numeric: tabular-nums; }

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 28px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, .16);
  font-size: 13px;
  color: rgba(255, 255, 255, .6);
}
.footer-icp { font-variant-numeric: tabular-nums; letter-spacing: .04em; color: rgba(255, 255, 255, .75); }
.footer-copy { font-variant-numeric: tabular-nums; }
.footer-hint { margin-inline-start: auto; color: rgba(255, 255, 255, .55); }

@media (max-width: 1023px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 600px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-hint { margin-inline-start: 0; }
}

/* ---------- 11. 面包屑 ---------- */
.breadcrumb { font-size: 13px; letter-spacing: .02em; }
.breadcrumb ol { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; color: var(--ink-50); }
.breadcrumb li { display: flex; align-items: center; gap: 6px; }
.breadcrumb li + li::before { content: "／"; color: rgba(16, 20, 24, .28); }
.breadcrumb a:hover { color: var(--ochre); }
.breadcrumb [aria-current="page"] { color: var(--ink-70); }

/* ---------- 12. 图片容器 ---------- */
.media {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-l);
  background: linear-gradient(135deg, rgba(127, 176, 105, .22), rgba(47, 127, 158, .18) 46%, rgba(224, 123, 57, .18));
  aspect-ratio: 16 / 9;
}
.media > img,
.media > picture > img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
}
.media--wide { aspect-ratio: 21 / 9; border-radius: var(--radius-m); }
.media--tall { aspect-ratio: 4 / 5; }
.media--square { aspect-ratio: 1 / 1; }
.media--spring { background: linear-gradient(135deg, rgba(127, 176, 105, .34), rgba(228, 179, 99, .24)); }
.media--summer { background: linear-gradient(135deg, rgba(47, 127, 158, .30), rgba(47, 168, 140, .22)); }
.media--autumn { background: linear-gradient(135deg, rgba(180, 71, 47, .28), rgba(224, 123, 57, .26)); }
.media--winter { background: linear-gradient(135deg, rgba(27, 42, 73, .78), rgba(247, 244, 238, .5)); }
.media-caption { margin-top: 10px; font-size: 13px; line-height: 1.6; color: var(--ink-50); letter-spacing: .02em; }

/* ---------- 13. 可展开内容组 ---------- */
.disclosure { border-top: 1px solid var(--line); }
.disclosure:last-child { border-bottom: 1px solid var(--line); }
.disclosure-trigger {
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  width: 100%;
  padding: 20px 2px;
  text-align: left;
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 1.6vw, 20px);
  line-height: 1.4;
  color: var(--ink);
  transition: color .16s ease;
}
.disclosure-trigger:hover { color: var(--ochre); }
.disclosure-trigger[aria-expanded="true"] { color: var(--ochre); }
.disclosure-icon {
  position: relative;
  flex: none;
  width: 22px; height: 22px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  transition: border-color .16s ease, background-color .16s ease, transform .2s ease;
}
.disclosure-icon::before,
.disclosure-icon::after {
  content: "";
  position: absolute; left: 50%; top: 50%;
  background: currentColor;
  border-radius: 2px;
  transform: translate(-50%, -50%);
}
.disclosure-icon::before { width: 10px; height: 1.5px; }
.disclosure-icon::after { width: 1.5px; height: 10px; transition: opacity .2s ease; }
.disclosure-trigger[aria-expanded="true"] .disclosure-icon { background: var(--ochre); border-color: var(--ochre); color: var(--snow); transform: rotate(180deg); }
.disclosure-trigger[aria-expanded="true"] .disclosure-icon::after { opacity: 0; }
.disclosure-panel { display: grid; grid-template-rows: 0fr; transition: grid-template-rows .22s ease; }
.disclosure-panel[data-open] { grid-template-rows: 1fr; }
.disclosure-panel > div { overflow: hidden; }
.disclosure-body { padding: 0 0 26px; max-width: var(--max-read); color: var(--ink-70); }

/* ---------- 14. 索引与时间轴 ---------- */
.index-list { border-top: 1px solid var(--line); }
.index-row {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr) auto;
  gap: 16px;
  align-items: baseline;
  padding: 15px 4px;
  border-bottom: 1px solid var(--line);
  transition: background-color .16s ease;
}
.index-row:hover { background: rgba(16, 20, 24, .035); }
.index-num { font-family: var(--font-mono); font-size: 12.5px; color: var(--ink-50); font-variant-numeric: tabular-nums; }
.index-title { font-size: 16.5px; font-weight: 600; }
.index-meta { font-size: 13px; color: var(--ink-50); text-align: right; }

.timeline { position: relative; padding-left: 30px; }
.timeline::before { content: ""; position: absolute; left: 6px; top: 8px; bottom: 8px; width: 1px; background: var(--line-strong); }
.timeline-item { position: relative; padding-bottom: 40px; }
.timeline-item:last-child { padding-bottom: 0; }
.timeline-item::before {
  content: "";
  position: absolute; left: -30px; top: 7px;
  width: 13px; height: 13px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--season, var(--ochre));
}

/* ---------- 15. 数据块 ---------- */
.stat { display: flex; flex-direction: column; gap: 4px; }
.stat-num { font-family: var(--font-display); font-weight: 700; font-size: clamp(28px, 3.4vw, 44px); line-height: 1.1; letter-spacing: -.01em; font-variant-numeric: tabular-nums; }
.stat-label { font-size: 13px; letter-spacing: .04em; color: var(--ink-50); }

/* ---------- 16. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
}