.page-home,
.page-home *,
.page-home *::before,
.page-home *::after {
  box-sizing: border-box;
}

.page-home {
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-body);
}

.page-home img {
  max-width: 100%;
  height: auto;
}

.page-home a:focus-visible,
.page-home [tabindex]:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

/* ---------- 首屏 ---------- */

.page-home .hero-band {
  position: relative;
  overflow: hidden;
  background-color: var(--color-contrast-surface);
  padding: var(--space-8) 0 var(--space-8);
}

.page-home .hero-media {
  position: absolute;
  inset: 0;
}

.page-home .hero-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-home .hero-scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
}

.page-home .hero-shell {
  position: relative;
}

.page-home .hero-kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-contrast-accent);
}

.page-home .hero-title {
  margin: var(--space-3) 0 0;
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 1.1;
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}

.page-home .hero-title-sub {
  display: block;
  margin-top: var(--space-2);
  font-size: var(--text-xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
  opacity: 0.76;
}

.page-home .hero-lead {
  max-width: var(--measure);
  margin: var(--space-4) 0 0;
  font-size: var(--text-lg);
  line-height: var(--leading-body);
  color: var(--color-contrast-ink);
}

.page-home .hero-base {
  background-color: var(--color-surface);
  padding: var(--space-6) 0 0;
}

.page-home .hero-figures {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4) var(--space-3);
}

.page-home .hero-figures > li {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  min-width: 0;
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-home .fig-num {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--text-figure);
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--color-accent);
  white-space: nowrap;
}

.page-home .fig-label {
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}

.page-home .hero-tracks {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  margin-top: var(--space-8);
}

.page-home .track {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-4) var(--space-3) var(--space-3) 0;
  border-top: var(--border-thin) solid var(--color-line);
  text-decoration: none;
  color: var(--color-ink);
  transition: background-color 220ms ease-out;
}

.page-home .track::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 0;
  width: 9px;
  height: 9px;
  border: var(--border-thin) solid var(--color-primary);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface);
  transition: background-color 220ms ease-out;
}

.page-home .track:hover,
.page-home .track:focus-visible {
  background-color: var(--color-surface-alt);
}

.page-home .track:hover::before,
.page-home .track:focus-visible::before {
  background-color: var(--color-primary);
}

.page-home .track-name {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
}

.page-home .track-note {
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-muted);
}

/* ---------- 章节通用 ---------- */

.page-home .chapter {
  padding-top: var(--section-y);
}

.page-home .chapter--lead {
  padding-top: var(--section-y-lg);
}

.page-home .chapter > .container {
  padding-bottom: var(--space-8);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-home .chapter--last > .container {
  border-bottom: 0;
  padding-bottom: var(--space-6);
}

.page-home .ch-head {
  display: grid;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}

.page-home .ch-eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-ink-muted);
}

.page-home .ch-title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-home .ch-note {
  max-width: var(--measure);
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ---------- 分类骨架 ---------- */

.page-home .structure-layout {
  display: grid;
  gap: var(--space-6);
}

.page-home .branches {
  display: grid;
  gap: var(--space-6);
}

.page-home .branch {
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-home .branch-name {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-home .branch-total {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.page-home .branch-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-home .branch-list > li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  padding: var(--space-1) 0;
  border-bottom: var(--border-thin) solid var(--color-line);
  transition: background-color 220ms ease-out;
}

.page-home .branch-list > li:last-child {
  border-bottom: 0;
}

.page-home .branch-list > li:hover {
  background-color: var(--color-surface-alt);
}

.page-home .cat-name {
  font-size: var(--text-base);
  color: var(--color-ink-soft);
}

.page-home .cat-count {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.page-home .branch-figure {
  margin: 0;
}

.page-home .branch-figure img,
.page-home .year-figure img,
.page-home .index-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
}

.page-home .branch-figure figcaption,
.page-home .year-figure figcaption,
.page-home .index-figure figcaption {
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

/* ---------- 年度节律 ---------- */

.page-home .year-figure {
  margin: 0 0 var(--space-6);
}

.page-home .year-rail {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

.page-home .year-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-3) var(--space-2) var(--space-4) 0;
  border-top: var(--border-thin) solid var(--color-line);
  transition: background-color 220ms ease-out;
}

.page-home .year-item:hover,
.page-home .year-item:focus-visible {
  background-color: var(--color-surface-alt);
}

.page-home .year-num {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-home .year-item--peak .year-num {
  color: var(--color-accent);
}

.page-home .year-count {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-ink-soft);
}

.page-home .year-detail {
  font-size: var(--text-xs);
  line-height: var(--leading-body);
  color: var(--color-ink-muted);
}

@media (hover: hover) and (min-width: 760px) {
  .page-home .year-detail {
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 240ms ease-out, opacity 240ms ease-out;
  }

  .page-home .year-item:hover .year-detail,
  .page-home .year-item:focus-visible .year-detail,
  .page-home .year-item:focus-within .year-detail {
    max-height: 6em;
    opacity: 1;
  }
}

/* ---------- 双维索引 ---------- */

.page-home .index-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: var(--border-thin) solid var(--color-line);
  border-left: var(--border-thin) solid var(--color-line);
}

.page-home .index-grid > li {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: var(--space-6);
  border-right: var(--border-thin) solid var(--color-line);
  border-bottom: 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);
  transition: color 220ms ease-out, background-color 220ms ease-out;
}

.page-home .index-grid > li:hover {
  color: var(--color-primary);
  background-color: var(--color-surface-alt);
}

.page-home .index-foot {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-6);
}

.page-home .index-read p {
  max-width: var(--measure);
  margin: 0 0 var(--space-2);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-home .index-figure {
  margin: 0;
}

/* ---------- 最近更新 ---------- */

.page-home .chapter-tail {
  max-width: var(--measure);
  margin: var(--space-6) 0 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-home .chapter-tail a {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: var(--border-thin) solid var(--color-primary-soft);
}

.page-home .chapter-tail a:hover,
.page-home .chapter-tail a:focus-visible {
  border-bottom-color: var(--color-primary);
}

/* ---------- 阅读方式 ---------- */

.page-home .read-steps {
  list-style: none;
  counter-reset: readstep;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-4);
}

.page-home .read-steps > li {
  counter-increment: readstep;
  position: relative;
  padding: var(--space-3) 0 0 var(--space-6);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-home .read-steps > li::before {
  content: counter(readstep, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}

.page-home .read-steps h3 {
  margin: 0 0 var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-home .read-steps p {
  max-width: var(--measure);
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-home .read-paths {
  margin-top: var(--space-8);
  padding-top: var(--space-4);
  border-top: var(--border-thin) solid var(--color-line);
}

.page-home .read-paths-note {
  margin: 0 0 var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-ink-muted);
}

.page-home .read-paths-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
}

.page-home .read-paths-list > li {
  display: grid;
  gap: var(--space-1);
}

.page-home .read-paths-list a {
  padding-bottom: var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  text-decoration: none;
  border-bottom: var(--border-thin) solid var(--color-line);
  transition: color 220ms ease-out, border-color 220ms ease-out;
}

.page-home .read-paths-list a:hover,
.page-home .read-paths-list a:focus-visible {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.page-home .read-paths-list span {
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-muted);
}

/* ---------- 桌面端栅格 ---------- */

@media (min-width: 720px) {
  .page-home .hero-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-home .index-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-home .year-rail {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-home .read-paths-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: var(--space-6);
  }
}

@media (min-width: 820px) {
  .page-home .hero-tracks {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-home .track {
    padding-right: var(--space-4);
  }

  .page-home .index-foot {
    grid-template-columns: minmax(0, 1fr) 260px;
    column-gap: var(--space-6);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-home .ch-head {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    column-gap: var(--gutter);
  }

  .page-home .ch-eyebrow {
    grid-column: 1 / span 2;
  }

  .page-home .ch-title {
    grid-column: 3 / span 8;
    font-size: var(--text-3xl);
  }

  .page-home .ch-note {
    grid-column: 3 / span 6;
  }

  .page-home .structure-layout {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    column-gap: var(--gutter);
    align-items: start;
  }

  .page-home .branches {
    grid-column: 1 / span 7;
  }

  .page-home .branch-figure {
    grid-column: 8 / span 5;
  }

  .page-home .read-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: var(--space-6);
  }
}