:root {
  --color-surface: #f5f6f6;
  --color-surface-alt: #eceded;
  --color-surface-deep: #dfe1e1;
  --color-ink: #3b4947;
  --color-ink-soft: #5c706c;
  --color-ink-muted: #748b86;
  --color-line: #d4d7d6;
  --color-primary: #3b8274;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #dbe6e4;
  --color-accent: #ae633c;
  --color-accent-ink: #ffffff;
  --color-highlight: #e8dcd5;
  --color-focus: #aa572c;
  --color-contrast-surface: #1c2725;
  --color-contrast-ink: #e4e7e6;
  --color-contrast-line: #48514f;
  --color-contrast-accent: #c47a54;
  --overlay-scrim: linear-gradient(180deg, rgba(28, 39, 37, 0.35) 0%, rgba(28, 39, 37, 0.72) 55%, rgba(28, 39, 37, 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: 10.4px;
  --text-sm: 13.9px;
  --text-base: 16px;
  --text-lg: 21.3px;
  --text-xl: 28.4px;
  --text-2xl: 37.9px;
  --text-3xl: 50.5px;
  --text-4xl: 67.3px;
  --text-display: clamp(34px, 6.8vw, 87px);
  --text-figure: clamp(28px, 4.9vw, 63px);
  --weight-heading: 628;
  --weight-body: 400;
  --leading-body: 1.8;
  --leading-heading: 1.22;
  --tracking-heading: -0.004em;
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 6px;
  --radius-pill: 6px;
  --border-thin: 1px;
  --border-thick: 2px;
  --shadow-1: 0 1px 0 rgba(59, 73, 71, 0.12);
  --shadow-2: 0 2px 0 rgba(59, 73, 71, 0.18);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1160px;
  --measure: 69ch;
  --gutter: 24px;
  --section-y: 99px;
  --section-y-lg: 139px;
}

/* =========================================================
   派生常量（仅新增，不改动上方定稿变量）
   ========================================================= */
:root {
  --font-serif: "Songti SC", "SimSun", "Songti TC", "Source Han Serif SC", "Noto Serif SC", serif;
  --tick-step: 12px;
  --nav-break: 900px;
}

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

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

body,
h1, h2, h3, h4, h5, h6,
p, figure, blockquote, dl, dd, ul, ol {
  margin: 0;
}

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

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

a {
  color: inherit;
}

table {
  border-collapse: collapse;
  width: 100%;
}

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

/* =========================================================
   2. 基础排版
   ========================================================= */
body {
  font-family: var(--font-serif);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
  color: var(--color-ink);
  background-color: var(--color-surface);
  overflow-x: hidden;
}

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

h1 { font-size: var(--text-2xl); }
h2 { font-size: var(--text-xl); }
h3 { font-size: var(--text-lg); }
h4 { font-size: var(--text-base); }

p {
  color: var(--color-ink);
}

small {
  font-size: var(--text-xs);
}

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

code,
kbd,
samp,
pre {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}

hr {
  border: 0;
  border-block-start: var(--border-thin) solid var(--color-line);
  margin-block: var(--space-4);
}

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

:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* =========================================================
   3. 布局基座
   ========================================================= */
.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);
}

.section--alt {
  background-color: var(--color-surface-alt);
}

.grid {
  display: grid;
  gap: var(--gutter);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.prose {
  max-width: var(--measure);
}

.prose > * + * {
  margin-block-start: var(--space-2);
}

.prose h2 {
  margin-block-start: var(--space-6);
}

.prose h3 {
  margin-block-start: var(--space-4);
}

.prose ul,
.prose ol {
  padding-inline-start: 1.25em;
  list-style: disc;
}

.prose ol {
  list-style: decimal;
}

/* =========================================================
   4. 展示字号（仅限首屏主标题与大数字）
   ========================================================= */
.display-1 {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 1.02;
  letter-spacing: 0.01em;
  color: var(--color-ink);
}

.figure-lg {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
  color: var(--color-accent);
}

.u-sans {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  letter-spacing: 0.06em;
}

.u-mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* =========================================================
   5. 边界与分隔语言：序号 / 刻度代替线条
   ========================================================= */
.rule-index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.tick-rule {
  display: block;
  flex: 0 1 96px;
  min-width: 56px;
  height: 6px;
  background-image: repeating-linear-gradient(
    90deg,
    var(--color-ink-muted) 0 1px,
    transparent 1px var(--tick-step)
  );
  opacity: 0.5;
}

.section-marker {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.3em;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  color: var(--color-ink-muted);
  transition: color 200ms ease;
}

.section-marker[data-active="true"] {
  color: var(--color-accent);
}

/* =========================================================
   6. 强调机制：标签与徽标
   ========================================================= */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  line-height: 1.7;
  white-space: nowrap;
}

.tag--accent {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

.tag--line {
  background: transparent;
  border: var(--border-thin) solid var(--color-line);
  color: var(--color-ink-soft);
}

/* =========================================================
   7. 按钮
   ========================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 22px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  letter-spacing: 0.1em;
  line-height: 1.2;
  text-decoration: none;
  transition: background-color 150ms ease, color 150ms ease, border-color 150ms ease;
}

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

.btn--primary:hover {
  background: var(--color-focus);
}

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

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

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

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

/* =========================================================
   8. 面包屑
   ========================================================= */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}

.breadcrumb a {
  color: var(--color-ink-soft);
  text-decoration: none;
}

.breadcrumb a:hover {
  color: var(--color-primary);
}

.breadcrumb__sep {
  color: var(--color-line);
}

/* =========================================================
   9. 图片容器（页面阶段放置图片占位）
   ========================================================= */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  border-radius: var(--radius-md);
  background-color: var(--color-surface-deep);
}

.media > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media--wide { aspect-ratio: 16 / 9; }
.media--banner { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 3 / 4; }
.media--portrait { aspect-ratio: 4 / 5; }
.media--square { aspect-ratio: 1 / 1; }

.media__scrim {
  position: absolute;
  inset-inline: 0;
  inset-block-end: 0;
  padding: var(--space-3);
  color: var(--color-contrast-ink);
  background: var(--overlay-scrim);
  font-size: var(--text-sm);
  line-height: 1.6;
}

.media__scrim strong {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: 0.06em;
  margin-block-end: 4px;
}

.media--tall,
.media--portrait {
  max-width: 100%;
}

/* =========================================================
   10. 深色数据带
   ========================================================= */
.band-deep {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-radius: var(--radius-lg);
}

.band-deep h2,
.band-deep h3,
.band-deep p {
  color: var(--color-contrast-ink);
}

.band-deep a {
  color: var(--color-contrast-accent);
}

.band-deep .rule-index {
  color: var(--color-contrast-accent);
}

.band-deep .tick-rule {
  background-image: repeating-linear-gradient(
    90deg,
    var(--color-contrast-line) 0 1px,
    transparent 1px var(--tick-step)
  );
  opacity: 0.9;
}

/* =========================================================
   11. 轨道卡片 / 筛选条
   ========================================================= */
.track-card {
  position: relative;
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  transition: border-color 160ms ease;
}

.track-card:hover,
.track-card:focus-within {
  border-color: var(--color-primary);
}

.track-card__more {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 200ms ease;
}

.track-card__more > p {
  overflow: hidden;
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.track-card:hover .track-card__more,
.track-card:focus-within .track-card__more {
  grid-template-rows: 1fr;
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.filter-btn {
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  background: var(--color-surface-deep);
  color: var(--color-ink-soft);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  transition: background-color 140ms ease, color 140ms ease;
}

.filter-btn:hover {
  background: var(--color-primary-soft);
  color: var(--color-primary);
}

.filter-btn[aria-pressed="true"] {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

[data-filter-item][hidden] {
  display: none;
}

/* =========================================================
   12. 显现
   ========================================================= */
[data-reveal].is-ready {
  opacity: 0;
  transform: translateY(10px);
}

[data-reveal].is-ready[data-revealed="true"] {
  opacity: 1;
  transform: none;
  transition: opacity 420ms ease, transform 420ms ease;
}

/* =========================================================
   13. Skip link / 滚动进度
   ========================================================= */
.skip-link {
  position: absolute;
  inset-inline-start: var(--space-2);
  inset-block-start: -120px;
  z-index: 200;
  display: inline-block;
  padding: 10px 18px;
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  text-decoration: none;
  border-radius: var(--radius-sm);
  transition: inset-block-start 140ms ease;
}

.skip-link:focus {
  inset-block-start: var(--space-2);
}

.scroll-progress {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  height: var(--border-thick);
  z-index: 150;
  pointer-events: none;
  background: transparent;
}

.scroll-progress > span {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
}

/* =========================================================
   14. 头部
   ========================================================= */
.site-header {
  position: relative;
  z-index: 60;
  background: var(--color-surface);
  border-block-end: var(--border-thin) solid var(--color-line);
}

.site-header__inner {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.masthead {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 96px;
  padding-block: var(--space-3);
}

.masthead__brand {
  display: inline-block;
  padding-inline: var(--space-6);
  text-align: center;
  text-decoration: none;
}

.masthead__name {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: 1.06;
  letter-spacing: 0.14em;
  text-indent: 0.14em;
  color: var(--color-ink);
}

.masthead__sub {
  display: block;
  margin-block-start: 6px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.34em;
  text-indent: 0.34em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.masthead__side {
  position: absolute;
  inset-block: var(--space-3);
  inset-inline-start: 0;
  display: flex;
  align-items: center;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.3em;
  color: var(--color-ink-muted);
}

.masthead__aside {
  position: absolute;
  inset-inline-end: 0;
  inset-block-start: 50%;
  transform: translateY(-50%);
}

.masthead__cta {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  border: var(--border-thin) solid var(--color-primary);
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  color: var(--color-primary);
  text-decoration: none;
  transition: background-color 150ms ease, color 150ms ease;
}

.masthead__cta:hover {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

.season-rule {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding-block: var(--space-1);
  border-block: var(--border-thin) solid var(--color-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
  background: var(--color-surface-alt);
}

.season-rule__item {
  flex: 0 0 auto;
  white-space: nowrap;
}

.season-rule__ticks {
  flex: 1 1 auto;
  min-width: 24px;
  height: 6px;
  background-image: repeating-linear-gradient(
    90deg,
    var(--color-line) 0 1px,
    transparent 1px var(--tick-step)
  );
}

.site-nav {
  display: block;
}

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: stretch;
}

.site-nav__list a {
  position: relative;
  display: block;
  padding: var(--space-2) var(--space-4) var(--space-2);
  border-block-end: var(--border-thick) solid transparent;
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  letter-spacing: 0.14em;
  color: var(--color-ink-soft);
  text-decoration: none;
  transition: color 150ms ease, border-color 150ms ease;
}

.site-nav__list a:hover {
  color: var(--color-primary);
}

.site-nav__list a[aria-current="page"] {
  color: var(--color-primary);
  border-block-end-color: var(--color-accent);
}

.nav-toggle {
  display: none;
  position: absolute;
  inset-inline-end: 0;
  inset-block-start: 50%;
  transform: translateY(-50%);
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-ink-soft);
  background: var(--color-surface);
  transition: color 150ms ease, border-color 150ms ease;
}

.nav-toggle__bars {
  display: block;
  width: 16px;
}

.nav-toggle__bars i {
  display: block;
  height: 1px;
  margin-block: 4px;
  background: currentColor;
}

.nav-toggle__label {
  line-height: 1;
}

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

/* =========================================================
   15. 页脚
   ========================================================= */
.site-footer {
  margin-block-start: var(--section-y);
  padding-block: var(--space-8) var(--space-6);
  background: var(--color-surface-alt);
  border-block-start: var(--border-thin) solid var(--color-line);
}

.site-footer__inner {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.footer-head {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-block-end: var(--space-4);
}

.footer-head__brand {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: 0.12em;
  color: var(--color-ink);
  text-decoration: none;
}

.footer-head__brand:hover {
  color: var(--color-primary);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-2);
  align-items: start;
}

.footer-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-3);
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
}

.footer-panel--deep {
  background: var(--color-contrast-surface);
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}

.footer-panel__idx {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.28em;
  color: var(--color-accent);
}

.footer-panel--deep .footer-panel__idx {
  color: var(--color-contrast-accent);
}

.footer-panel__title {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  letter-spacing: 0.1em;
  color: var(--color-ink);
}

.footer-panel--deep .footer-panel__title {
  color: var(--color-contrast-ink);
}

.footer-facts {
  display: grid;
  gap: 6px;
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
}

.footer-facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.footer-facts__n {
  font-family: var(--font-mono);
  font-size: var(--text-base);
  font-variant-numeric: tabular-nums;
  color: var(--color-contrast-accent);
}

.footer-links {
  display: grid;
  gap: 2px;
}

.footer-links a {
  display: inline-block;
  padding-block: 2px;
  border-block-end: 1px solid transparent;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  text-decoration: none;
  transition: color 140ms ease, border-color 140ms ease;
}

.footer-links a:hover {
  color: var(--color-primary);
  border-block-end-color: var(--color-primary);
}

.footer-contact {
  display: grid;
  gap: var(--space-1);
}

.footer-contact li {
  display: grid;
  gap: 2px;
}

.footer-contact__k {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-ink-muted);
}

.footer-contact__v {
  font-size: var(--text-sm);
  color: var(--color-ink);
  overflow-wrap: anywhere;
}

.footer-note {
  font-size: var(--text-xs);
  line-height: 1.7;
  color: var(--color-ink-muted);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-2);
  margin-block-start: var(--space-4);
  padding-block-start: var(--space-3);
  border-block-start: var(--border-thin) solid var(--color-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.footer-base p {
  color: inherit;
  font-size: inherit;
}

.footer-base__meta {
  color: var(--color-ink-muted);
}

/* =========================================================
   16. 响应式
   ========================================================= */
@media (max-width: 1080px) {
  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  .masthead {
    min-height: 78px;
  }

  .masthead__brand {
    padding-inline: var(--space-8) var(--space-8);
  }

  .masthead__name {
    font-size: var(--text-xl);
    letter-spacing: 0.1em;
    text-indent: 0.1em;
  }

  .masthead__side,
  .masthead__aside {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    display: none;
    border-block-start: var(--border-thin) solid var(--color-line);
  }

  .site-nav[data-open="true"] {
    display: block;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    padding-block: var(--space-1) var(--space-2);
  }

  .site-nav__list a {
    padding: var(--space-2) var(--space-1);
    border-block-end: var(--border-thin) solid var(--color-line);
    letter-spacing: 0.1em;
  }

  .site-nav__list a[aria-current="page"] {
    border-block-end-color: var(--color-accent);
  }

  .grid--3,
  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (max-width: 640px) {
  :root {
    --gutter: 18px;
  }

  h1 { font-size: var(--text-xl); }
  h2 { font-size: var(--text-lg); }

  .masthead__name {
    font-size: var(--text-lg);
  }

  .season-rule {
    gap: var(--space-1);
    font-size: var(--text-xs);
  }

  .season-rule__ticks {
    min-width: 16px;
  }

  .grid--2,
  .grid--3,
  .grid--4 {
    grid-template-columns: minmax(0, 1fr);
  }

  .footer-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .footer-head {
    flex-wrap: wrap;
    gap: var(--space-2);
  }

  .footer-base {
    flex-direction: column;
  }

  .section,
  .section--lg {
    padding-block: var(--space-6);
  }

  .media--banner,
  .media--wide {
    aspect-ratio: 4 / 3;
  }
}

/* =========================================================
   17. 降低动效
   ========================================================= */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

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

  .track-card__more {
    grid-template-rows: 1fr;
  }
}