:root {
  --color-surface: #ebeded;
  --color-surface-alt: #e2e5e4;
  --color-surface-deep: #d5d9d9;
  --color-ink: #374443;
  --color-ink-soft: #576a69;
  --color-ink-muted: #708584;
  --color-line: #cbcfce;
  --color-primary: #3e7e7b;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #d3dddd;
  --color-accent: #94703d;
  --color-accent-ink: #ffffff;
  --color-highlight: #dbd6cd;
  --color-focus: #87612b;
  --color-contrast-surface: #161d1d;
  --color-contrast-ink: #e4e7e7;
  --color-contrast-line: #434949;
  --color-contrast-accent: #b4894b;
  --overlay-scrim: linear-gradient(180deg, rgba(22, 29, 29, 0.35) 0%, rgba(22, 29, 29, 0.72) 55%, rgba(22, 29, 29, 0.92) 100%);
  --font-heading: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-body: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --text-xs: 12.2px;
  --text-sm: 15.2px;
  --text-base: 17px;
  --text-lg: 21.2px;
  --text-xl: 26.6px;
  --text-2xl: 33.2px;
  --text-3xl: 41.5px;
  --text-4xl: 51.9px;
  --text-display: clamp(36px, 7.5vw, 96px);
  --text-figure: clamp(30px, 5.4vw, 69px);
  --weight-heading: 692;
  --weight-body: 400;
  --leading-body: 1.8;
  --leading-heading: 1.28;
  --tracking-heading: 0.006em;
  --radius-sm: 3px;
  --radius-md: 3px;
  --radius-lg: 3px;
  --radius-pill: 3px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 1px 0 rgba(55, 68, 67, 0.12);
  --shadow-2: 0 2px 0 rgba(55, 68, 67, 0.18);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1180px;
  --measure: 67ch;
  --gutter: 16px;
  --section-y: 88px;
  --section-y-lg: 123px;
}

/* ========== Reset ========== */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 96px;
}

body {
  margin: 0;
  background: 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;
  text-rendering: optimizeLegibility;
}

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

p { margin: 0 0 var(--space-2); }

ul, ol { margin: 0; padding: 0; list-style: none; }

a { color: inherit; text-decoration: none; }

img, svg, video { display: block; max-width: 100%; }

button, input, select, textarea { font: inherit; color: inherit; }

::selection {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

:where(a, button, [tabindex]):focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

main:focus { outline: none; }

.skip-link {
  position: fixed;
  top: var(--space-1);
  left: var(--space-1);
  z-index: 100;
  padding: 10px 16px;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  transform: translateY(-240%);
  transition: transform 0.2s ease-out;
}

.skip-link:focus { transform: none; }

/* ========== 布局基础 ========== */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--tight { padding-block: var(--space-8); }

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gutter);
}

.span-2 { grid-column: span 2; }
.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-9 { grid-column: span 9; }
.span-10 { grid-column: span 10; }
.span-12 { grid-column: span 12; }

/* ========== 中文排版 ========== */
.prose {
  max-width: var(--measure);
  font-family: "Songti SC", "Songti TC", "Source Han Serif SC", "Noto Serif CJK SC", "SimSun", serif;
  font-size: var(--text-base);
  line-height: 1.8;
  color: var(--color-ink);
}

.prose > p { margin: 0 0 var(--space-3); }

.prose h2,
.prose h3,
.prose h4 {
  font-family: var(--font-heading);
  margin: var(--space-6) 0 var(--space-2);
}

.prose h2 { font-size: var(--text-xl); }
.prose h3 { font-size: var(--text-lg); }

.prose ul,
.prose ol {
  margin: 0 0 var(--space-3);
  padding-left: 1.2em;
  list-style: disc;
}

.prose li { margin-bottom: var(--space-1); }

.prose strong { font-weight: var(--weight-heading); }

.u-mark {
  background: var(--color-highlight);
  color: var(--color-ink);
  padding: 0.05em 0.2em;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}

.u-line {
  border-bottom: 2px solid var(--color-accent);
  padding-bottom: 1px;
}

/* ========== 竖排小标注 ========== */
.vh-label {
  display: inline-block;
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.24em;
  line-height: 1;
  color: var(--color-ink-muted);
}

.vh-label--light { color: var(--color-contrast-ink); }
.vh-label--accent { color: var(--color-contrast-accent); }

/* ========== 编号章节体系 ========== */
.chapter {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr);
  gap: var(--space-3);
  padding-block: var(--space-6);
  border-top: var(--border-thin) solid var(--color-line);
}

.chapter-no {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-primary);
  font-variant-numeric: tabular-nums;
}

.chapter-title {
  position: relative;
  padding-bottom: var(--space-1);
  font-size: var(--text-xl);
}

.chapter-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 48px;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.28s ease-out;
}

[data-reveal].is-visible .chapter-title::after { transform: scaleX(1); }

.chapter-body > p { max-width: var(--measure); }

/* ========== 面包屑 ========== */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.crumb {
  color: var(--color-ink-soft);
  border-bottom: var(--border-thin) solid transparent;
  transition: color 0.18s ease-out, border-color 0.18s ease-out;
}

.crumb:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.crumb[aria-current="page"] {
  color: var(--color-ink);
  border-bottom-color: var(--color-accent);
}

.crumb-sep {
  color: var(--color-ink-muted);
  opacity: 0.6;
}

/* ========== 按钮 ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: 9px 16px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-sm);
  background: transparent;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.02em;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color 0.18s ease-out, color 0.18s ease-out, border-color 0.18s ease-out;
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-primary-ink);
  border-color: var(--color-primary);
}

.btn--primary:hover {
  background: color-mix(in srgb, var(--color-primary) 86%, var(--color-contrast-surface));
  border-color: color-mix(in srgb, var(--color-primary) 86%, var(--color-contrast-surface));
}

.btn--ghost {
  background: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.btn--ghost:hover {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

.btn--quiet {
  background: transparent;
  color: var(--color-ink-soft);
  border-color: var(--color-line);
}

.btn--quiet:hover {
  background: var(--color-surface-deep);
  color: var(--color-ink);
}

/* ========== 内联标签组（筛选 / 切换器） ========== */
.chip-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-ink-soft);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: background-color 0.18s ease-out, color 0.18s ease-out, border-color 0.18s ease-out;
}

.chip:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.chip[aria-pressed="true"],
.chip.is-active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}

/* ========== 深色数据区块 ========== */
.block-contrast {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-md);
  padding: var(--space-4);
}

.block-contrast h2,
.block-contrast h3,
.block-contrast h4 { color: var(--color-contrast-ink); }

.block-contrast p { color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent); }

.data-figure {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-contrast-accent);
  font-variant-numeric: tabular-nums;
}

.data-figure--ink { color: var(--color-primary); }

/* ========== 图片容器与展签 ========== */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface-deep);
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.72) contrast(1.04) brightness(0.98);
}

.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame[data-scrim]::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
  pointer-events: none;
}

.media-tag {
  position: absolute;
  left: var(--space-2);
  bottom: var(--space-2);
  z-index: 2;
  padding: 4px 8px;
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--color-contrast-surface) 84%, transparent);
  color: var(--color-contrast-ink);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  transition: transform 0.2s ease-out;
}

.media-frame:hover .media-tag { transform: translateY(-4px); }

.media-caption {
  position: absolute;
  left: var(--space-3);
  right: var(--space-3);
  bottom: var(--space-3);
  z-index: 2;
  margin: 0;
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  line-height: 1.6;
}

/* ========== 显现与滚动辅助 ========== */
.js-ready [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.28s ease-out, transform 0.28s ease-out;
}

.js-ready [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  z-index: 90;
  background: color-mix(in srgb, var(--color-line) 62%, transparent);
  pointer-events: none;
}

.scroll-progress-bar {
  display: block;
  height: 100%;
  width: 100%;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: left center;
}

.to-top {
  position: fixed;
  right: var(--space-3);
  bottom: var(--space-3);
  z-index: 80;
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 10px 8px;
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-sm);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.24em;
  writing-mode: vertical-rl;
  text-orientation: upright;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.2s ease-out, transform 0.2s ease-out, visibility 0.2s linear;
}

.to-top::before {
  content: "";
  width: 2px;
  height: 16px;
  background: var(--color-contrast-accent);
}

.to-top[data-visible] {
  opacity: 1;
  visibility: visible;
  transform: none;
}

/* ========== 页头：悬浮胶囊导航 ========== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: var(--color-surface);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.header-inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
  max-width: var(--container);
  min-height: 72px;
  margin-inline: auto;
  padding: var(--space-2) var(--gutter);
}

.header-mark {
  display: block;
  height: 40px;
  padding-right: var(--space-1);
  border-right: var(--border-thin) solid var(--color-line);
  writing-mode: vertical-rl;
  text-orientation: upright;
  text-align: center;
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.24em;
  line-height: 1;
  color: var(--color-ink-muted);
  flex: 0 0 auto;
}

.header-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  flex: 0 0 auto;
  color: var(--color-ink);
}

.brand-name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  letter-spacing: var(--tracking-heading);
}

.brand-rule {
  width: 2px;
  height: 18px;
  background: var(--color-accent);
  border-radius: var(--radius-sm);
}

.brand-sub {
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
  white-space: nowrap;
}

.header-panel {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-left: auto;
  min-width: 0;
}

.header-nav { min-width: 0; }

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
}

.nav-link {
  display: block;
  padding: 7px 12px;
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.02em;
  color: var(--color-ink-soft);
  white-space: nowrap;
  transition: background-color 0.18s ease-out, color 0.18s ease-out;
}

.nav-link:hover {
  background: var(--color-surface-deep);
  color: var(--color-ink);
}

.nav-link[aria-current="page"] {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.header-status {
  display: none;
  margin: 0;
  padding-left: var(--space-3);
  border-left: var(--border-thin) solid var(--color-line);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
  white-space: nowrap;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: var(--space-1);
  margin-left: auto;
  padding: 10px 14px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
  color: var(--color-ink-soft);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  cursor: pointer;
}

.nav-toggle-text { letter-spacing: 0.08em; }

.nav-toggle-bars {
  position: relative;
  display: block;
  width: 18px;
  height: 1px;
  background: currentColor;
  transition: background-color 0.18s ease-out;
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 1px;
  background: currentColor;
  transition: transform 0.18s ease-out;
}

.nav-toggle-bars::before { top: -6px; }
.nav-toggle-bars::after { top: 6px; }

.nav-toggle[aria-expanded="true"] {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars { background: transparent; }

.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { transform: translateY(6px) rotate(45deg); }

.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { transform: translateY(-6px) rotate(-45deg); }

@media (min-width: 1200px) {
  .header-status { display: block; }
}

@media (max-width: 1023px) {
  .nav-toggle { display: inline-flex; }

  .header-panel {
    display: none;
    position: absolute;
    left: var(--gutter);
    right: var(--gutter);
    top: calc(100% + 4px);
    z-index: 70;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
    margin-left: 0;
    padding: var(--space-3);
    background: var(--color-surface);
    border: var(--border-thin) solid var(--color-line);
    border-radius: var(--radius-md);
  }

  .header-panel[data-open] { display: flex; }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0;
    border: 0;
    background: transparent;
  }

  .nav-link {
    padding: 12px 4px;
    border-bottom: var(--border-thin) solid var(--color-line);
    border-radius: 0;
  }

  .nav-list li:last-child .nav-link { border-bottom: 0; }

  .header-actions { flex-direction: column; align-items: stretch; }
  .header-actions .btn { width: 100%; }

  .header-status {
    display: block;
    padding-left: 0;
    border-left: 0;
    padding-top: var(--space-2);
    border-top: var(--border-thin) solid var(--color-line);
  }
}

@media (max-width: 600px) {
  .header-inner { min-height: 64px; padding: 12px var(--gutter); }
  .header-mark { display: none; }
  .brand-sub { display: none; }
}

/* ========== 页脚：阶梯式三层 ========== */
.site-footer {
  border-top: var(--border-thin) solid var(--color-line);
  background: var(--color-surface);
}

.footer-inner {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-6) var(--gutter);
}

.footer-top {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}

.footer-top .footer-inner {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-6);
}

.footer-brand {
  flex: 0 0 auto;
  max-width: 300px;
}

.footer-lockup {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}

.footer-lockup::after {
  content: "";
  display: block;
  width: 36px;
  height: 2px;
  margin-top: var(--space-1);
  background: var(--color-contrast-accent);
}

.footer-sub {
  margin: var(--space-2) 0 0;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: color-mix(in srgb, var(--color-contrast-ink) 74%, transparent);
}

.footer-index {
  flex: 1 1 auto;
  min-width: 0;
}

.index-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-1) var(--space-3);
}

.index-link {
  display: inline-block;
  padding: 4px 0;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  color: color-mix(in srgb, var(--color-contrast-ink) 86%, transparent);
  border-bottom: var(--border-thin) solid transparent;
  transition: color 0.18s ease-out, border-color 0.18s ease-out;
}

.index-link:hover {
  color: var(--color-contrast-accent);
  border-bottom-color: var(--color-contrast-accent);
}

.footer-top .vh-label {
  flex: 0 0 auto;
  height: 96px;
  padding-left: var(--space-2);
  border-left: var(--border-thin) solid var(--color-contrast-line);
  color: color-mix(in srgb, var(--color-contrast-ink) 68%, transparent);
}

.footer-mid {
  background: var(--color-surface-alt);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.footer-mid .footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-6);
  padding-block: var(--space-4);
}

.fan-entry { min-width: 0; }

.fan-title {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  margin: 0 0 var(--space-2);
  font-size: var(--text-sm);
  letter-spacing: 0.14em;
  color: var(--color-ink);
}

.fan-title::before {
  content: "";
  width: 2px;
  height: 14px;
  background: var(--color-primary);
}

.fan-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

.fan-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 8px 14px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  transition: background-color 0.18s ease-out, color 0.18s ease-out, border-color 0.18s ease-out;
}

.fan-link:hover {
  background: var(--color-primary-soft);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.footer-note {
  margin: 0;
  max-width: 46ch;
  font-size: var(--text-xs);
  line-height: 1.9;
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
}

.footer-bottom { background: var(--color-surface); }

.footer-bottom .footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-4);
  padding-block: var(--space-4);
}

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

.legal-link {
  padding: 4px 0;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  border-bottom: var(--border-thin) solid var(--color-line);
  transition: color 0.18s ease-out, border-color 0.18s ease-out;
}

.legal-link:hover {
  color: var(--color-focus);
  border-bottom-color: var(--color-accent);
}

.footer-meta,
.footer-status {
  margin: 0;
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.footer-status { margin-left: auto; }

@media (max-width: 1023px) {
  .footer-top .footer-inner { flex-wrap: wrap; gap: var(--space-4); }
  .footer-brand { flex: 1 1 100%; max-width: none; }
  .footer-top .vh-label { display: none; }
  .index-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 767px) {
  .footer-inner { padding: var(--space-4) var(--gutter); }
  .index-list { grid-template-columns: 1fr; }
  .footer-mid .footer-inner { flex-direction: column; gap: var(--space-3); }
  .fan-list { flex-direction: column; align-items: stretch; }
  .fan-link { justify-content: center; }
  .footer-bottom .footer-inner { flex-direction: column; align-items: flex-start; }
  .footer-status { margin-left: 0; }
}

/* ========== 栅格降列 ========== */
@media (max-width: 1023px) {
  .span-3, .span-4 { grid-column: span 6; }
  .span-5, .span-6, .span-7, .span-8, .span-9, .span-10 { grid-column: span 12; }
  .chapter { grid-template-columns: 48px minmax(0, 1fr); gap: var(--space-2); }
}

@media (max-width: 767px) {
  .span-3, .span-4 { grid-column: span 12; }
  .chapter { grid-template-columns: 1fr; gap: var(--space-1); }
  .to-top { right: var(--space-2); bottom: var(--space-2); }
}

/* ========== 动效降级 ========== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  html { scroll-behavior: auto; }

  .js-ready [data-reveal] { opacity: 1; transform: none; }

  .chapter-title::after { transform: scaleX(1); }

  .media-frame:hover .media-tag { transform: none; }
}