:root {
  --color-surface: #f9f9f9;
  --color-surface-alt: #f0f0f1;
  --color-surface-deep: #e4e4e5;
  --color-ink: #4b4653;
  --color-ink-soft: #716a7b;
  --color-ink-muted: #7e7788;
  --color-line: #dad9db;
  --color-primary: #7138c7;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #e6def2;
  --color-accent: #5a8212;
  --color-accent-ink: #ffffff;
  --color-highlight: #dce4cf;
  --color-focus: #527b0a;
  --color-contrast-surface: #130f19;
  --color-contrast-ink: #e5e4e7;
  --color-contrast-line: #413e46;
  --color-contrast-accent: #9be01f;
  --overlay-scrim: linear-gradient(180deg, rgba(19, 15, 25, 0.35) 0%, rgba(19, 15, 25, 0.72) 55%, rgba(19, 15, 25, 0.92) 100%);
  --font-heading: "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --text-xs: 12.2px;
  --text-sm: 14.6px;
  --text-base: 16px;
  --text-lg: 19.2px;
  --text-xl: 23.0px;
  --text-2xl: 27.6px;
  --text-3xl: 33.2px;
  --text-4xl: 39.8px;
  --text-display: clamp(34px, 4.7vw, 60px);
  --text-figure: clamp(28px, 3.4vw, 43px);
  --weight-heading: 655;
  --weight-body: 400;
  --leading-body: 1.73;
  --leading-heading: 1.2;
  --tracking-heading: 0.009em;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 1px 0 rgba(75, 70, 83, 0.12);
  --shadow-2: 0 2px 0 rgba(75, 70, 83, 0.18);
  --space-1: 6px;
  --space-2: 12px;
  --space-3: 18px;
  --space-4: 24px;
  --space-6: 36px;
  --space-8: 48px;
  --container: 1220px;
  --measure: 70ch;
  --gutter: 24px;
  --section-y: 75px;
  --section-y-lg: 105px;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  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);
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
ul, ol { margin: 0; padding: 0; list-style: none; }
button { font: inherit; color: inherit; }
[hidden] { display: none !important; }
main { display: block; }

/* ===== 排版 ===== */
h1, h2, h3, h4 {
  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: color-mix(in srgb, var(--color-ink) 84%, var(--color-contrast-surface));
}
h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }
p { margin: 0 0 var(--space-3); }
p:last-child { margin-bottom: 0; }
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.display-title {
  font-size: var(--text-display);
  line-height: 1.05;
  letter-spacing: -0.012em;
  margin: 0 0 var(--space-4);
}
.figure-num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--color-primary);
}
.eyebrow {
  margin: 0 0 var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-primary);
}
.lede {
  margin: 0 0 var(--space-4);
  max-width: var(--measure);
  font-size: var(--text-lg);
  color: var(--color-ink-soft);
}
:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 2px; }

/* ===== 布局容器 ===== */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}
.container--narrow { max-width: 880px; }
.section { padding: var(--section-y) 0; }
.section--lg { padding: var(--section-y-lg) 0; }
.section--alt { background-color: var(--color-surface-alt); }
.section--deep { background-color: var(--color-surface-deep); }
.section--contrast {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.section--contrast h1,
.section--contrast h2,
.section--contrast h3,
.section--contrast h4 { color: var(--color-contrast-ink); }
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}
.section-title { margin: 0; font-size: var(--text-2xl); }
.grid { display: grid; gap: var(--space-3); }
.stack { display: flex; flex-direction: column; gap: var(--space-3); }
.split {
  display: grid;
  grid-template-columns: minmax(0, 220px) minmax(0, 1fr);
  gap: var(--space-6);
  align-items: start;
}
.aside-rail {
  position: sticky;
  top: 96px;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

/* ===== 正文块 ===== */
.prose { max-width: var(--measure); }
.prose p { margin: 0 0 var(--space-3); }
.prose ul { margin: 0 0 var(--space-3); padding-left: var(--space-4); }
.prose li { list-style: disc; margin-bottom: var(--space-1); }
.prose h2, .prose h3 { margin-top: var(--space-6); }
.quote-block {
  margin: 0 0 var(--space-4);
  padding: var(--space-3) var(--space-4) var(--space-3) var(--space-6);
  background-color: var(--color-highlight);
  border-radius: var(--radius-md);
  font-size: var(--text-lg);
  color: color-mix(in srgb, var(--color-ink) 78%, var(--color-accent));
}
.quote-block::before {
  content: "“";
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  line-height: 0;
  margin-right: 2px;
  color: var(--color-accent);
}
.note-inline {
  margin: 0;
  font-size: var(--text-xs);
  line-height: 1.7;
  color: var(--color-ink-muted);
}

/* ===== 头部 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background-color: var(--color-surface);
  box-shadow: var(--shadow-1);
}
.header-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: var(--space-3) var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}
.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -64px;
  z-index: 90;
  padding: var(--space-2) var(--space-3);
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-size: var(--text-sm);
  border-radius: var(--radius-sm);
  transition: top 140ms ease-out;
}
.skip-link:focus { top: var(--space-2); text-decoration: none; }

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-ink);
}
.brand:hover { text-decoration: none; }
.brand-glyph {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.06em;
}
.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  letter-spacing: var(--tracking-heading);
}
.brand-domain {
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  letter-spacing: 0.04em;
}

.header-edge {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}
.site-nav { display: block; }
.nav-list { display: flex; align-items: center; gap: var(--space-3); }
.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: var(--space-2) 2px;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  color: var(--color-ink);
  text-decoration: none;
  transition: color 140ms ease-out, transform 140ms ease-out;
}
.nav-link:hover {
  color: var(--color-primary);
  transform: translateY(1px);
  text-decoration: none;
}
.nav-index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
  transition: color 140ms ease-out;
}
.nav-link:hover .nav-index, .nav-link:focus-visible .nav-index { color: var(--color-primary); }
.nav-link[aria-current="page"] { color: var(--color-primary); font-weight: var(--weight-heading); }
.nav-link[aria-current="page"] .nav-index { color: var(--color-primary); }
.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  border-radius: var(--radius-pill);
  background-color: var(--color-primary);
}
.nav-hint {
  position: absolute;
  top: 100%;
  left: 0;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-primary);
  opacity: 0;
  transform: translateY(-4px);
  pointer-events: none;
  transition: opacity 150ms ease-out, transform 150ms ease-out;
}
.nav-link:hover .nav-hint, .nav-link:focus-visible .nav-hint { opacity: 1; transform: translateY(0); }

.season-meter {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-2);
  background-color: var(--color-surface-deep);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
}
.season-meter__label { letter-spacing: 0.08em; color: var(--color-ink-muted); }
.season-meter__value { font-weight: 700; color: var(--color-primary); }
.season-meter__bar {
  display: block;
  width: 64px;
  height: 3px;
  border-radius: var(--radius-pill);
  background-color: color-mix(in srgb, var(--color-ink) 16%, transparent);
  overflow: hidden;
}
.season-meter__fill { display: block; height: 100%; background-color: var(--color-primary); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  background-color: var(--color-surface-deep);
  color: var(--color-ink);
  border: 0;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: background-color 140ms ease-out;
}
.nav-toggle:hover { background-color: var(--color-primary-soft); }
.nav-toggle__bars { display: flex; flex-direction: column; gap: 3px; width: 14px; }
.nav-toggle__bars span {
  display: block;
  height: 1.5px;
  border-radius: var(--radius-pill);
  background-color: currentColor;
  transition: transform 140ms ease-out;
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:first-child { transform: translateY(2.25px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:last-child { transform: translateY(-2.25px) rotate(-45deg); }

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  overflow: hidden;
}
.scroll-progress__fill {
  display: block;
  width: 100%;
  height: 100%;
  background-color: var(--color-primary);
  transform: scaleX(0);
  transform-origin: 0 50%;
}

/* ===== 页脚 ===== */
.site-footer {
  margin-top: var(--section-y-lg);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  font-size: var(--text-sm);
}
.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: var(--space-8) var(--gutter) var(--space-6);
}
.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 2.1fr);
  gap: var(--space-6);
  align-items: start;
}
.footer-brand__name {
  margin: 0 0 2px;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xl);
  color: var(--color-contrast-ink);
}
.footer-brand__domain {
  margin: 0 0 var(--space-2);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  opacity: 0.66;
}
.footer-brand__note {
  margin: 0;
  max-width: 36ch;
  font-size: var(--text-xs);
  line-height: 1.75;
  opacity: 0.72;
}
.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}
.footer-col__title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-contrast-accent);
  opacity: 0.85;
}
.footer-list li + li { margin-top: var(--space-1); }
.footer-link {
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: color 140ms ease-out;
}
.footer-link:hover { color: var(--color-contrast-accent); text-decoration: underline; }
.footer-contact {
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  display: grid;
  gap: var(--space-1);
}
.footer-contact__line {
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  font-size: var(--text-xs);
  opacity: 0.86;
}
.footer-contact__key {
  flex: 0 0 6em;
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  opacity: 0.62;
}
.footer-legal {
  margin-top: var(--space-6);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-2);
  font-size: var(--text-xs);
  opacity: 0.66;
}
.footer-region, .footer-legal__line { margin: 0; }

/* ===== 标签与状态 ===== */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 1px var(--space-1);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface-deep);
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
}
.tag--primary { background-color: var(--color-primary-soft); color: var(--color-primary); }
.tag--accent {
  background-color: color-mix(in srgb, var(--color-accent) 14%, var(--color-surface));
  color: var(--color-accent);
}
.status-dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  border-radius: var(--radius-pill);
  background-color: var(--color-accent);
}
.section--contrast .tag { background-color: color-mix(in srgb, var(--color-contrast-ink) 12%, transparent); color: var(--color-contrast-ink); }
.section--contrast .tag--primary { color: var(--color-contrast-accent); }
.section--contrast .tag--accent { color: var(--color-contrast-accent); }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border: 0;
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  text-decoration: none;
  cursor: pointer;
  transition: background-color 140ms ease-out, color 140ms ease-out, transform 140ms ease-out;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn--primary { background-color: var(--color-primary); color: var(--color-primary-ink); }
.btn--primary:hover { background-color: color-mix(in srgb, var(--color-primary) 84%, var(--color-contrast-surface)); }
.btn--ghost { background-color: var(--color-surface-deep); color: var(--color-ink); }
.btn--ghost:hover { background-color: var(--color-primary-soft); color: var(--color-primary); }
.btn--contrast { background-color: var(--color-contrast-accent); color: var(--color-contrast-surface); }

/* ===== 面包屑 ===== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) 0 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
}
.breadcrumb a { color: var(--color-ink-soft); }
.breadcrumb a:hover { color: var(--color-primary); }
.breadcrumb__sep { color: var(--color-ink-muted); opacity: 0.6; }

/* ===== 卡片 ===== */
.card-grid {
  display: grid;
  gap: var(--space-3);
  grid-template-columns: repeat(auto-fill, minmax(258px, 1fr));
}
.card-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.card-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.card-grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-3);
  background-color: var(--color-surface-alt);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-1);
  transition: transform 150ms ease-out, background-color 150ms ease-out, box-shadow 150ms ease-out;
}
.card:hover, .card:focus-within {
  transform: translateY(-2px);
  background-color: var(--color-primary-soft);
  box-shadow: var(--shadow-2);
}
.card__head { display: flex; align-items: center; flex-wrap: wrap; gap: var(--space-1); }
.card__index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  padding: 1px var(--space-1);
  border-radius: var(--radius-sm);
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  transition: background-color 150ms ease-out;
}
.card:hover .card__index { background-color: color-mix(in srgb, var(--color-primary) 76%, var(--color-contrast-surface)); }
.card__title {
  margin: 0;
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
}
.card__title a { color: inherit; }
.card__title a:hover { color: var(--color-primary); text-decoration: none; }
.card__desc { margin: 0; font-size: var(--text-sm); color: var(--color-ink-soft); }
.card__meta {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}
.card__foot {
  margin-top: auto;
  padding-top: var(--space-2);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}
.card__links { display: flex; flex-direction: column; gap: 2px; }
.card__links a { font-size: var(--text-xs); color: var(--color-ink-soft); }
.card__links a:hover { color: var(--color-primary); }
.section--contrast .card {
  background-color: color-mix(in srgb, var(--color-contrast-ink) 8%, transparent);
  box-shadow: none;
  color: var(--color-contrast-ink);
}
.section--contrast .card:hover { background-color: color-mix(in srgb, var(--color-contrast-ink) 15%, transparent); }
.section--contrast .card__desc { color: var(--color-ink-soft); }
.section--contrast .card__meta { color: var(--color-contrast-ink); opacity: 0.62; }

/* ===== 分类导览与筛选 ===== */
.filter-panel { display: block; }
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  margin-bottom: var(--space-2);
}
.filter-chip {
  padding: var(--space-1) var(--space-2);
  border: 0;
  border-radius: var(--radius-pill);
  background-color: var(--color-surface-deep);
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.05em;
  cursor: pointer;
  transition: background-color 140ms ease-out, color 140ms ease-out;
}
.filter-chip:hover { background-color: var(--color-primary-soft); color: var(--color-primary); }
.filter-chip[aria-pressed="true"] { background-color: var(--color-primary); color: var(--color-primary-ink); }
.filter-count {
  margin: 0 0 var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

/* ===== 横向数据带 ===== */
.data-band {
  display: flex;
  gap: var(--space-3);
  overflow-x: auto;
  padding: var(--space-1) 0 var(--space-3);
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
}
.data-band__item {
  flex: 0 0 auto;
  min-width: 190px;
  padding: var(--space-3);
  background-color: var(--color-surface-alt);
  border-radius: var(--radius-md);
  scroll-snap-align: start;
}
.data-band__item .figure-num { font-size: var(--text-2xl); }
.section--contrast .data-band__item { background-color: color-mix(in srgb, var(--color-contrast-ink) 8%, transparent); }
.section--contrast .data-band__item .figure-num { color: var(--color-contrast-accent); }

/* ===== 编号入口清单 ===== */
.entry-list { display: block; }
.entry {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-3) 0;
}
.entry__index {
  flex: 0 0 auto;
  padding-bottom: var(--space-1);
  border-bottom: var(--border-thin) solid var(--color-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-primary);
}
.entry__body { min-width: 0; }
.entry__title { margin: 0 0 2px; font-size: var(--text-lg); }
.entry__title a { color: inherit; }
.entry__title a:hover { color: var(--color-primary); text-decoration: none; }
.entry__desc { margin: 0; font-size: var(--text-sm); color: var(--color-ink-soft); }
.entry__link {
  display: inline-block;
  margin-top: var(--space-1);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  transition: transform 150ms ease-out, color 150ms ease-out;
}
.entry:hover .entry__link { transform: translateX(2px); color: var(--color-primary); }

/* ===== 图片容器 ===== */
.media-frame {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background-color: var(--color-surface-deep);
  box-shadow: var(--shadow-1);
}
.media-frame img { width: 100%; height: 100%; object-fit: cover; }
.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: var(--space-8) var(--space-3) var(--space-3);
  background: var(--overlay-scrim);
  color: var(--color-contrast-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
}

/* ===== 显现（JS 可用时才隐藏） ===== */
[data-reveal] { transition: opacity 180ms ease-out, transform 180ms ease-out; }
.reveal-ready [data-reveal]:not(.is-revealed) { opacity: 0; transform: translateY(8px); }

/* ===== 响应式 ===== */
@media (max-width: 1080px) {
  .card-grid--4 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .brand-domain { display: none; }
}
@media (max-width: 980px) {
  .header-inner { gap: var(--space-2); }
  .nav-toggle { display: inline-flex; }
  .season-meter { display: none; }
  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    max-height: 78vh;
    overflow-y: auto;
    padding: var(--space-2) var(--gutter) var(--space-6);
    background-color: var(--color-surface-alt);
    box-shadow: var(--shadow-2);
  }
  .site-nav[data-open] { display: block; }
  .nav-list { flex-direction: column; align-items: stretch; gap: 0; }
  .nav-item { width: 100%; }
  .nav-link {
    display: grid;
    grid-template-columns: auto 1fr;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) 0;
    font-size: var(--text-lg);
  }
  .nav-hint {
    position: static;
    grid-column: 1 / -1;
    opacity: 1;
    transform: none;
    color: var(--color-ink-muted);
  }
  .nav-link[aria-current="page"]::after { display: none; }
  .nav-link[aria-current="page"] .nav-label { color: var(--color-primary); }
  .split { grid-template-columns: minmax(0, 1fr); gap: var(--space-4); }
  .aside-rail { position: static; }
  .card-grid--3, .card-grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-top { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 860px) {
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: var(--space-4); }
}
@media (max-width: 640px) {
  :root { --gutter: 18px; }
  .card-grid, .card-grid--2, .card-grid--3, .card-grid--4 { grid-template-columns: minmax(0, 1fr); }
  .footer-cols { grid-template-columns: minmax(0, 1fr); }
  .footer-legal { flex-direction: column; }
  .section { padding: var(--space-8) 0; }
  .section--lg { padding: var(--space-8) 0 var(--space-6); }
  .footer-inner { padding: var(--space-6) var(--gutter) var(--space-4); }
}

/* ===== 动效降级 ===== */
@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;
  }
  .card:hover, .card:focus-within { transform: none; }
  .nav-link:hover { transform: none; }
  .entry:hover .entry__link { transform: none; }
  .btn:hover { transform: none; }
  .reveal-ready [data-reveal]:not(.is-revealed) { opacity: 1; transform: none; }
}