:root {
  --color-surface: #fdfdfd;
  --color-surface-alt: #f4f4f4;
  --color-surface-deep: #e7e8e7;
  --color-ink: #494c43;
  --color-ink-soft: #6d7165;
  --color-ink-muted: #81857a;
  --color-line: #dddddc;
  --color-primary: #5c8211;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #e6ecdc;
  --color-accent: #0f7cae;
  --color-accent-ink: #ffffff;
  --color-highlight: #d2e6ef;
  --color-focus: #0578ad;
  --color-contrast-surface: #161b0d;
  --color-contrast-ink: #e6e7e4;
  --color-contrast-line: #44483c;
  --color-contrast-accent: #14a7eb;
  --overlay-scrim: linear-gradient(180deg, rgba(22, 27, 13, 0.35) 0%, rgba(22, 27, 13, 0.72) 55%, rgba(22, 27, 13, 0.92) 100%);
  --font-heading: "Source Han Sans SC", "Noto Sans SC", SimHei, "Microsoft YaHei", sans-serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, Menlo, Consolas, monospace;
  --text-xs: 10.7px;
  --text-sm: 15.1px;
  --text-base: 18px;
  --text-lg: 25.5px;
  --text-xl: 36.0px;
  --text-2xl: 50.9px;
  --text-3xl: 72.0px;
  --text-4xl: 101.7px;
  --text-display: clamp(54px, 11.1vw, 142px);
  --text-figure: clamp(45px, 8.0vw, 102px);
  --weight-heading: 749;
  --weight-body: 400;
  --leading-body: 1.73;
  --leading-heading: 1.19;
  --tracking-heading: 0.008em;
  --radius-sm: 14px;
  --radius-md: 18px;
  --radius-lg: 23px;
  --radius-pill: 999px;
  --border-thin: 2px;
  --border-thick: 3px;
  --shadow-1: 0 1px 0 rgba(73, 76, 67, 0.12);
  --shadow-2: 0 2px 0 rgba(73, 76, 67, 0.18);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1260px;
  --measure: 67ch;
  --gutter: 24px;
  --section-y: 95px;
  --section-y-lg: 133px;
}

/* =========================================================
   新记体育会 · /assets/site.css
   1 重置 / 2 排版 / 3 进度 / 4 头部轨道 / 5 抽屉 / 6 页脚
   7 容器栅格 / 8 区块 / 9 组件 / 10 装饰 / 11 动效 / 12 响应式
   ========================================================= */

/* ---------- 1 重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  --rail-w: 96px;
  margin: 0;
  min-height: 100%;
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
}

img, svg, video, canvas { display: block; max-width: 100%; height: auto; }
ul, ol { margin: 0; padding: 0; list-style: none; }
button { font: inherit; color: inherit; background: none; border: 0; }
table { width: 100%; border-collapse: collapse; }
main { display: block; }

#main-content { scroll-margin-top: 96px; }

/* ---------- 2 排版 ---------- */
h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: inherit;
}

p { margin: 0 0 var(--space-3); max-width: var(--measure); }

a { color: var(--color-accent); text-decoration: none; }
a:hover { color: var(--color-primary); }

strong, b { font-weight: var(--weight-heading); }

.num, [data-count], time, .stat, .badge, table { font-variant-numeric: tabular-nums; }

:focus-visible { outline: 3px solid var(--color-focus); outline-offset: 3px; border-radius: 4px; }
::selection { background: var(--color-highlight); color: var(--color-ink); }

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: var(--space-2);
  left: var(--space-2);
  z-index: 90;
  padding: 12px 20px;
  border-radius: var(--radius-pill);
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  transform: translateY(-220%);
  transition: transform 160ms ease;
  box-shadow: 5px 5px 0 var(--color-contrast-surface);
}
.skip-link:hover { color: var(--color-primary-ink); }
.skip-link:focus { transform: translateY(0); }

/* ---------- 3 阅读进度 ---------- */
.progress-rail {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 6px;
  z-index: 80;
  background-color: color-mix(in srgb, var(--color-line) 62%, transparent);
  pointer-events: none;
}
.progress-rail__bar {
  display: block;
  width: 0;
  height: 100%;
  background-image: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 58%, var(--color-contrast-accent) 100%);
}

/* ---------- 4 头部（移动端＝顶栏 / 桌面端＝左侧轨道） ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding: calc(var(--space-2) + 6px) var(--gutter) var(--space-2);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-bottom: var(--border-thick) solid var(--color-primary);
}

.site-header .deco--wedge {
  right: 0;
  bottom: -3px;
  width: 88px;
  height: 6px;
  background-color: var(--color-contrast-accent);
  clip-path: polygon(18% 0, 100% 0, 82% 100%, 0 100%);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-contrast-ink);
}
.brand:hover { color: var(--color-contrast-ink); }

.brand__mark {
  position: relative;
  flex: 0 0 auto;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background-color: var(--color-primary);
  border: var(--border-thin) solid var(--color-contrast-ink);
  box-shadow: 4px 4px 0 var(--color-contrast-accent);
}
.brand__mark::after {
  content: "";
  position: absolute;
  right: -3px;
  bottom: -3px;
  width: 15px;
  height: 15px;
  border-radius: 50% 50% 0 50%;
  background-color: var(--color-highlight);
}

.brand__lockup { display: flex; flex-direction: column; gap: 2px; }
.brand__name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-base);
  letter-spacing: 0.14em;
  line-height: 1.1;
}
.brand__tagline {
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: color-mix(in srgb, var(--color-contrast-ink) 70%, transparent);
}

.nav-toggle {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  flex: 0 0 auto;
  width: 54px;
  height: 46px;
  padding: 0 13px;
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  cursor: pointer;
  box-shadow: 4px 4px 0 var(--color-primary);
  transition: transform 160ms ease, box-shadow 160ms ease;
}
.nav-toggle:hover { transform: translate(-2px, -2px); box-shadow: 6px 6px 0 var(--color-primary); }
.nav-toggle__bar {
  display: block;
  height: 3px;
  border-radius: 2px;
  background-color: currentColor;
}
.nav-toggle[aria-expanded="true"] { box-shadow: 4px 4px 0 var(--color-contrast-accent); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar--mid { opacity: 0; }

/* ---------- 5 导航：移动抽屉 ---------- */
.site-nav {
  position: fixed;
  top: 0; bottom: 0; left: 0;
  z-index: 70;
  width: min(88vw, 348px);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-8) var(--space-4) var(--space-6);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-right: var(--border-thick) solid var(--color-primary);
  box-shadow: 10px 0 0 color-mix(in srgb, var(--color-primary) 40%, transparent);
  overflow-y: auto;
  visibility: hidden;
  transform: translateX(-104%);
  transition: transform 260ms cubic-bezier(0.2, 0.75, 0.3, 1), visibility 0s linear 260ms;
}
.site-nav[data-open] {
  visibility: visible;
  transform: none;
  transition: transform 260ms cubic-bezier(0.2, 0.75, 0.3, 1), visibility 0s;
}

.nav-close {
  align-self: flex-start;
  padding: 8px 16px;
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-pill);
  background-color: transparent;
  color: var(--color-contrast-ink);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  cursor: pointer;
}
.nav-close:hover { border-color: var(--color-contrast-accent); color: var(--color-contrast-accent); }

.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 55;
  background-color: color-mix(in srgb, var(--color-contrast-surface) 72%, transparent);
  opacity: 0;
  pointer-events: none;
  transition: opacity 220ms ease;
}
.nav-scrim.is-open { opacity: 1; pointer-events: auto; }

.nav-utility {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  padding-bottom: var(--space-3);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}
.nav-utility__title {
  flex: 1 0 100%;
  margin: 0 0 var(--space-1);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.28em;
  color: color-mix(in srgb, var(--color-contrast-accent) 88%, var(--color-contrast-ink));
}

.nav-list { display: flex; flex-direction: column; gap: var(--space-1); }

.nav-link {
  display: block;
  padding: var(--space-2) var(--space-3);
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-md);
  color: var(--color-contrast-ink);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: 1.2;
  letter-spacing: 0.06em;
  transition: background-color 160ms ease, border-color 160ms ease, color 160ms ease;
}
.nav-link:hover {
  color: var(--color-contrast-ink);
  background-color: color-mix(in srgb, var(--color-contrast-accent) 20%, transparent);
  border-color: var(--color-contrast-line);
}
.nav-list .nav-link[aria-current="page"] {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  border-color: var(--color-contrast-ink);
  box-shadow: 5px 5px 0 var(--color-contrast-accent);
}

/* ---------- 6 页脚 ---------- */
.site-footer {
  position: relative;
  padding-top: var(--section-y);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: var(--border-thick) solid var(--color-primary);
}

.site-footer .deco--half {
  top: var(--space-6);
  right: var(--space-6);
  width: 96px;
  height: 48px;
  border-radius: 96px 96px 0 0;
  background-color: var(--color-primary);
}
.site-footer .deco--dot {
  bottom: calc(var(--space-8) + var(--space-3));
  left: var(--space-3);
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background-color: var(--color-contrast-accent);
}

.footer__inner {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-6);
}

.footer__lead { display: flex; flex-direction: column; gap: var(--space-2); }

.footer__brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--color-contrast-ink);
}
.footer__brand:hover { color: var(--color-contrast-accent); }
.footer__brand-name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  letter-spacing: 0.12em;
}
.footer__tagline {
  margin: 0;
  font-size: var(--text-sm);
  letter-spacing: 0.22em;
  color: color-mix(in srgb, var(--color-contrast-ink) 74%, transparent);
}

.footer__contact-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: var(--space-1);
}
.footer__contact-item {
  font-size: var(--text-sm);
  line-height: 1.5;
  color: var(--color-contrast-ink);
  word-break: break-word;
}

.footer__note {
  margin: 0;
  max-width: 42ch;
  font-size: var(--text-xs);
  line-height: 1.7;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}

.footer__cols {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4) var(--space-3);
}
.footer__col-title {
  margin: 0 0 var(--space-2);
  padding-bottom: var(--space-1);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.24em;
  color: color-mix(in srgb, var(--color-contrast-accent) 86%, var(--color-contrast-ink));
}
.footer__list { display: flex; flex-direction: column; gap: 8px; }
.footer__link {
  display: inline-block;
  color: color-mix(in srgb, var(--color-contrast-ink) 88%, transparent);
  font-size: var(--text-sm);
  line-height: 1.5;
  transition: transform 160ms ease, color 160ms ease;
}
.footer__link:hover {
  color: var(--color-contrast-accent);
  transform: translateX(4px);
}

.footer__legal {
  position: relative;
  z-index: 1;
  margin-top: var(--section-y);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}
.footer__legal-inner {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-3) var(--gutter);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}
.footer__legal-text,
.footer__legal-icp {
  margin: 0;
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 70%, transparent);
}
.footer__legal-icp {
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  color: var(--color-contrast-ink);
}

/* ---------- 7 容器与栅格 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container--narrow { max-width: calc(var(--measure) + var(--gutter) * 2); }

.grid {
  display: grid;
  grid-template-columns: repeat(9, minmax(0, 1fr));
  gap: var(--gutter);
}
.col-2 { grid-column: span 2; }
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-9 { grid-column: span 9; }
.col-push-1 { grid-column-start: 2; }
.col-push-2 { grid-column-start: 3; }

/* ---------- 8 区块 ---------- */
.section {
  position: relative;
  padding-block: var(--section-y);
  background-color: var(--color-surface);
}
.section--lg { padding-block: var(--section-y-lg); }
.section--alt { background-color: var(--color-surface-alt); }
.section--soft { background-color: var(--color-primary-soft); }
.section--highlight { background-color: var(--color-highlight); }
.section--deep {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.section--deep a:not(.btn) { color: var(--color-contrast-accent); }
.section--deep a:not(.btn):hover { color: var(--color-primary-ink); }

.section--slant-top {
  clip-path: polygon(0 34px, 100% 0, 100% 100%, 0 100%);
  padding-top: calc(var(--section-y) + 34px);
}
.section--slant-bottom {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 34px), 0 100%);
  padding-bottom: calc(var(--section-y) + 34px);
}

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-2) var(--gutter);
  align-items: end;
  margin-bottom: var(--space-6);
}
.section-head__aside { display: flex; flex-wrap: wrap; gap: var(--space-1); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 var(--space-2);
  padding: 6px 14px;
  border: var(--border-thin) solid var(--color-primary);
  border-radius: var(--radius-pill);
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.24em;
  line-height: 1.2;
}
.section--deep .eyebrow {
  background-color: transparent;
  border-color: var(--color-contrast-accent);
  color: var(--color-contrast-accent);
}

.section-title {
  font-size: var(--text-xl);
  letter-spacing: 0.02em;
  margin-bottom: var(--space-2);
}
.section-lead {
  font-size: var(--text-base);
  color: var(--color-ink-soft);
  margin: 0;
}
.section--deep .section-lead { color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent); }

.display {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-display);
  line-height: 0.98;
  letter-spacing: -0.012em;
  margin: 0 0 var(--space-3);
}
.figure {
  display: block;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-figure);
  line-height: 1;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

.rule {
  height: var(--border-thin);
  margin: var(--space-6) 0;
  border: 0;
  background-color: var(--color-line);
}
.rule--offset {
  width: calc(100% - var(--space-8));
  margin-inline-start: var(--space-8);
}
.section--deep .rule { background-color: var(--color-contrast-line); }

/* ---------- 9 组件 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: 12px 20px;
  border: var(--border-thin) solid var(--color-ink);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  line-height: 1.2;
  text-decoration: none;
  box-shadow: 4px 4px 0 var(--color-line);
  transition: transform 160ms ease, box-shadow 160ms ease, background-color 160ms ease, color 160ms ease;
}
.btn:hover {
  color: var(--color-ink);
  transform: translate(-3px, -3px);
  box-shadow: 7px 7px 0 var(--color-highlight);
}
.btn:active { transform: translate(0, 0); box-shadow: var(--shadow-1); }

.btn--primary {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  border-color: var(--color-primary);
  box-shadow: 4px 4px 0 color-mix(in srgb, var(--color-primary) 45%, var(--color-contrast-surface));
}
.btn--primary:hover {
  color: var(--color-primary-ink);
  box-shadow: 7px 7px 0 var(--color-contrast-accent);
}
.btn--accent {
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
  border-color: var(--color-accent);
}
.btn--accent:hover { color: var(--color-accent-ink); }
.btn--ghost {
  background-color: transparent;
  color: currentColor;
  border-color: currentColor;
  box-shadow: 4px 4px 0 var(--color-line);
}
.btn--ghost:hover { color: currentColor; }
.btn--block { width: 100%; }

.site-header .btn--ghost { box-shadow: 4px 4px 0 var(--color-contrast-line); }
.site-header .btn--ghost:hover { box-shadow: 7px 7px 0 var(--color-contrast-accent); }

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0 0 var(--space-4);
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}
.breadcrumbs a {
  color: var(--color-ink-soft);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
}
.breadcrumbs a:hover { color: var(--color-primary); }
.breadcrumbs__sep { color: var(--color-line); }
.breadcrumbs [aria-current="page"] { color: var(--color-ink); }

.card {
  position: relative;
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
}
.card--link {
  display: block;
  border-color: var(--color-ink);
  color: var(--color-ink);
  box-shadow: 6px 6px 0 var(--color-highlight);
  transition: transform 180ms ease, box-shadow 180ms ease;
}
.card--link:hover {
  color: var(--color-ink);
  transform: translate(-3px, -3px);
  box-shadow: 9px 9px 0 var(--color-primary-soft);
}
.card__title {
  font-size: var(--text-lg);
  margin-bottom: var(--space-1);
}
.card__meta {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.tag-list { display: flex; flex-wrap: wrap; gap: var(--space-1); margin-bottom: var(--space-3); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface);
  color: var(--color-ink-soft);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  line-height: 1.2;
  cursor: pointer;
  transition: background-color 140ms ease, border-color 140ms ease, color 140ms ease;
}
.tag:hover { border-color: var(--color-accent); color: var(--color-accent); }
.tag[aria-pressed="true"] {
  background-color: var(--color-highlight);
  border-color: var(--color-primary);
  color: var(--color-ink);
  box-shadow: 4px 4px 0 var(--color-primary);
}

.badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  line-height: 1.5;
  vertical-align: middle;
}
.section--deep .badge { background-color: var(--color-contrast-accent); color: var(--color-contrast-surface); }

.fold { border-top: var(--border-thin) solid var(--color-line); }
.fold__toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  margin-top: var(--space-3);
  padding: 12px 20px;
  border: var(--border-thin) solid var(--color-ink);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  cursor: pointer;
  box-shadow: var(--shadow-1);
}
.fold__toggle::after { content: "＋"; font-family: var(--font-mono); }
.fold__toggle[aria-expanded="true"]::after { content: "－"; }
.fold__panel { margin-top: var(--space-3); }
.fold__panel[hidden] { display: none; }

.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border: 0;
  border-radius: 0;
  background-color: var(--color-surface-deep);
}
.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.72) contrast(1.06) brightness(0.96);
}
.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--band { aspect-ratio: 21 / 9; }
.media-frame__scrim {
  position: absolute;
  inset: 0;
  background-image: var(--overlay-scrim);
  pointer-events: none;
}
.media-frame__caption {
  position: absolute;
  left: var(--space-3);
  right: var(--space-3);
  bottom: var(--space-3);
  z-index: 1;
  margin: 0;
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  line-height: 1.5;
}

.prose { max-width: var(--measure); }
.prose h2 { margin-top: var(--space-6); font-size: var(--text-xl); }
.prose h3 { margin-top: var(--space-4); font-size: var(--text-lg); }
.prose ul, .prose ol { margin: 0 0 var(--space-3); padding-left: 1.1em; list-style: disc; }
.prose li { margin-bottom: 6px; }

/* ---------- 10 装饰形状 ---------- */
.deco {
  position: absolute;
  z-index: 0;
  pointer-events: none;
}
.deco--wedge {
  display: block;
  background-color: var(--color-accent);
  clip-path: polygon(0 0, 100% 0, 88% 100%, 0 100%);
}
.deco--pill {
  display: block;
  width: 96px;
  height: 26px;
  border-radius: var(--radius-pill);
  background-color: var(--color-highlight);
  border: var(--border-thin) solid var(--color-accent);
}
.deco--half {
  display: block;
  border-radius: 120px 120px 0 0;
  background-color: var(--color-primary);
}
.deco--dot {
  display: block;
  border-radius: 50%;
  background-color: var(--color-contrast-accent);
}

/* ---------- 11 动效 ---------- */
.js .reveal {
  opacity: 0;
  transform: translateY(12px);
}
.js .reveal.is-visible {
  opacity: 1;
  transform: none;
  transition: opacity 260ms ease-out, transform 260ms ease-out;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .js .reveal { opacity: 1; transform: none; }
}

/* ---------- 12 响应式 ---------- */
@media (min-width: 600px) {
  .section-title { font-size: var(--text-2xl); }
  .footer__cols { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .footer__inner { grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr); align-items: start; }
}

@media (min-width: 900px) {
  .section-head { grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr); }
  .footer__inner { grid-template-columns: minmax(0, 1fr) minmax(0, 2.1fr); gap: var(--space-8); }
  .footer__cols { gap: var(--space-4); }
}

@media (max-width: 900px) {
  .col-2, .col-3, .col-4, .col-5 { grid-column: span 2; }
  .col-6, .col-7, .col-8, .col-9 { grid-column: span 4; }
  .col-push-1, .col-push-2 { grid-column-start: auto; }
}

@media (max-width: 640px) {
  .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-3); }
  .grid > * { grid-column: span 2; }
  .rule--offset { width: 100%; margin-inline-start: 0; }
  .footer__inner { padding-inline: var(--space-3); }
  .site-footer .deco--half { right: var(--space-3); width: 64px; height: 32px; }
}

@media (max-width: 900px) {
  .grid { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* 桌面端：左侧垂直轨道 */
@media (min-width: 1024px) {
  body { padding-left: var(--rail-w); }

  .site-header {
    position: fixed;
    inset: 0 auto 0 0;
    width: var(--rail-w);
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    gap: var(--space-3);
    padding: calc(var(--space-4) + 6px) 6px var(--space-3);
    border-bottom: 0;
    border-right: var(--border-thick) solid var(--color-primary);
    overflow-y: auto;
    overflow-x: hidden;
    scrollbar-width: thin;
    scrollbar-color: var(--color-primary) transparent;
  }
  .site-header::-webkit-scrollbar { width: 4px; }
  .site-header::-webkit-scrollbar-thumb { background-color: var(--color-primary); border-radius: 2px; }

  .site-header .deco--wedge { width: 60px; }

  .brand { flex-direction: column; gap: 10px; text-align: center; }
  .brand__lockup { align-items: center; }
  .brand__name { writing-mode: vertical-rl; text-orientation: upright; letter-spacing: 0.22em; font-size: var(--text-sm); }
  .brand__tagline { display: none; }

  .nav-toggle { display: none; }
  .nav-scrim { display: none; }

  .site-nav {
    position: static;
    inset: auto;
    width: 100%;
    flex: 1 1 auto;
    align-items: center;
    gap: var(--space-3);
    padding: 0;
    background-color: transparent;
    border: 0;
    box-shadow: none;
    overflow: visible;
    visibility: visible;
    transform: none;
    transition: none;
  }

  .nav-close { display: none; }

  .nav-utility {
    flex-direction: column;
    align-items: center;
    gap: var(--space-1);
    width: 100%;
    padding-bottom: var(--space-3);
  }
  .nav-utility__title { writing-mode: vertical-rl; text-orientation: upright; letter-spacing: 0.28em; margin: 0 0 6px; }

  .nav-list { align-items: center; gap: var(--space-1); }

  .nav-link {
    writing-mode: vertical-rl;
    text-orientation: upright;
    padding: 12px 9px;
    border-radius: var(--radius-sm);
    font-size: var(--text-sm);
    letter-spacing: 0.18em;
  }
  .nav-list .nav-link[aria-current="page"] { box-shadow: 4px 4px 0 var(--color-contrast-accent); }

  .site-nav .btn {
    writing-mode: vertical-rl;
    text-orientation: upright;
    padding: 14px 11px;
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    letter-spacing: 0.18em;
  }

  #main-content { scroll-margin-top: 24px; }
}