.page-about {
  --about-orange-soft: #FBE3D3;
  --about-teal-soft: #DFEEEC;
  --about-magenta-soft: #F0DFE5;
  --about-cream-trans: rgba(250, 243, 224, 0.92);
  background: var(--color-bg);
}

.page-about .about-container {
  max-width: 1200px;
  margin: 0 auto;
}

.page-about .about-section {
  padding: 32px 16px;
}

/* ===== Hero 标题窄带 ===== */
.page-about .about-hero {
  background: var(--c-ochre);
  color: var(--c-cream);
  padding: 24px 16px 36px;
}

.page-about .about-hero__inner {
  max-width: 1200px;
  margin: 0 auto;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 12px;
  color: var(--c-mustard);
}

.page-about .about-hero .breadcrumb a {
  color: var(--c-cream);
}

.page-about .about-hero__kicker {
  display: inline-block;
  background: var(--c-mustard);
  color: var(--c-ochre);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 2px 8px;
  border-radius: var(--rd-sm);
  margin-bottom: 10px;
}

.page-about .about-hero h1 {
  font-size: clamp(1.5rem, 4vw, 2.4rem);
  line-height: 1.2;
  margin: 0 0 12px;
  color: var(--c-cream);
  max-width: 860px;
}

.page-about .about-hero__lead {
  font-size: 15px;
  line-height: 1.7;
  color: var(--about-cream-trans);
  max-width: 880px;
  margin: 0 0 20px;
}

.page-about .about-hero__lead a {
  color: var(--c-mustard);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.page-about .about-hero__badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-hero__badge {
  border: 1px solid var(--c-mustard);
  color: var(--c-mustard);
  font-family: var(--font-mono);
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 999px;
}

/* ===== 页内快速跳转条 ===== */
.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  background: var(--c-mustard);
  padding: 10px 16px;
  justify-content: center;
}

.page-about .about-jump a {
  color: var(--c-ochre);
  font-weight: 700;
  font-size: 13px;
  padding: 4px 10px;
  border-radius: var(--rd-sm);
  background: rgba(255, 246, 233, 0.35);
  text-decoration: none;
  transition: background 0.2s ease;
}

.page-about .about-jump a:hover,
.page-about .about-jump a:focus-visible {
  background: var(--c-card);
}

/* ===== 收录范围速览 ===== */
.page-about .about-survey {
  background: var(--color-bg);
}

.page-about .about-survey .section-head {
  margin-bottom: 20px;
}

.page-about .about-survey__grid {
  display: grid;
  gap: 14px;
  margin-bottom: 16px;
}

.page-about .about-survey__card {
  display: flex;
  gap: 12px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-top: 4px solid var(--c-orange);
  border-radius: var(--rd-md);
  padding: 14px;
  box-shadow: var(--shadow-sm);
}

.page-about .about-survey__card--nav {
  border-top-color: var(--c-orange);
}

.page-about .about-survey__card--beta {
  border-top-color: var(--c-vermilion);
}

.page-about .about-survey__card--jump {
  border-top-color: var(--c-blue);
}

.page-about .about-survey__card--ver {
  border-top-color: var(--c-teal);
}

.page-about .about-survey__card--store {
  border-top-color: var(--c-magenta);
}

.page-about .about-survey__card--shot {
  border-top-color: var(--c-grape);
}

.page-about .about-survey__icon {
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  border-radius: 8px;
  display: grid;
  place-items: center;
  font-size: 20px;
  font-weight: 900;
  color: #ffffff;
  background: var(--c-orange);
}

.page-about .about-survey__card--beta .about-survey__icon {
  background: var(--c-vermilion);
}

.page-about .about-survey__card--jump .about-survey__icon {
  background: var(--c-blue);
}

.page-about .about-survey__card--ver .about-survey__icon {
  background: var(--c-teal);
}

.page-about .about-survey__card--store .about-survey__icon {
  background: var(--c-magenta);
}

.page-about .about-survey__card--shot .about-survey__icon {
  background: var(--c-grape);
}

.page-about .about-survey__body h3 {
  font-size: 16px;
  color: var(--c-ochre);
  margin: 0 0 4px;
  line-height: 1.4;
}

.page-about .about-survey__body p {
  font-size: 13px;
  line-height: 1.55;
  margin: 0;
  color: var(--color-text);
}

.page-about .about-survey__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.page-about .about-survey__stat {
  background: var(--c-ink);
  color: var(--c-cream);
  border-radius: var(--rd-md);
  padding: 14px;
  text-align: center;
}

.page-about .about-survey__stat:last-child {
  grid-column: 1 / -1;
}

.page-about .about-survey__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  color: var(--c-mustard);
  line-height: 1.2;
}

.page-about .about-survey__stat-label {
  display: block;
  font-size: 12px;
  color: rgba(250, 243, 224, 0.85);
  line-height: 1.4;
}

/* ===== 十二分区架构 ===== */
.page-about .about-arch {
  background: var(--about-orange-soft);
}

.page-about .about-arch .section-head {
  margin-bottom: 16px;
}

.page-about .about-arch__intro {
  font-size: 14px;
  line-height: 1.65;
  max-width: 900px;
  margin: 0 0 16px;
  color: var(--color-text);
}

.page-about .about-arch__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 800px;
  margin: 0 auto 16px;
  border-radius: var(--rd-md);
  box-shadow: var(--shadow-sm);
}

.page-about .about-arch__table-wrap {
  overflow-x: auto;
  border-radius: var(--rd-md);
  box-shadow: var(--shadow-md);
}

.page-about .about-arch__table {
  min-width: 640px;
  background: var(--color-surface);
  margin-bottom: 0;
}

.page-about .about-arch__table td {
  font-size: 14px;
}

.page-about .about-arch__table tfoot td {
  font-weight: 700;
  background: var(--c-mustard);
  color: var(--c-ochre);
}

.page-about .about-arch__table tfoot tr:last-child td:last-child {
  border-radius: 0;
}

/* ===== 分类与标签层级 ===== */
.page-about .about-tax {
  background: var(--about-teal-soft);
}

.page-about .about-tax .section-head {
  margin-bottom: 20px;
}

.page-about .about-tax__layout {
  display: grid;
  gap: 20px;
}

.page-about .about-tax__panel {
  background: var(--color-surface);
  border-radius: var(--rd-md);
  padding: 16px;
  border: 1px solid rgba(27, 138, 138, 0.25);
  box-shadow: var(--shadow-sm);
}

.page-about .about-tax__panel h3 {
  color: var(--c-teal);
  font-size: 18px;
  margin: 0 0 14px;
}

.page-about .about-tax__panel h4 {
  font-size: 14px;
  color: var(--c-ochre);
  margin: 18px 0 8px;
}

.page-about .about-tax__tags-intro {
  font-size: 13px;
  line-height: 1.6;
  color: var(--color-text);
  margin: 0 0 14px;
}

.page-about .about-tax__hierarchy {
  display: grid;
  gap: 6px;
}

.page-about .about-tax__node {
  background: rgba(27, 138, 138, 0.08);
  border: 1px solid rgba(27, 138, 138, 0.2);
  border-radius: var(--rd-md);
  padding: 10px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 14px;
  color: var(--color-text);
}

.page-about .about-tax__node--root {
  background: var(--c-teal);
  color: var(--c-cream);
  border-color: var(--c-teal);
}

.page-about .about-tax__node--root .mono {
  color: var(--c-mustard);
}

.page-about .about-tax__node--leaf {
  background: rgba(46, 134, 171, 0.1);
  border-color: var(--c-blue);
}

.page-about .about-tax__connector {
  text-align: center;
  color: var(--c-teal);
  font-size: 18px;
  line-height: 1;
}

.page-about .about-tax__samples {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 6px;
}

.page-about .about-tax__samples li {
  font-size: 13px;
  line-height: 1.5;
  background: rgba(27, 138, 138, 0.05);
  border-left: 3px solid var(--c-teal);
  padding: 6px 8px;
  color: var(--color-text);
}

.page-about .about-tax__samples .mono {
  font-weight: 700;
}

.page-about .about-tax__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 600px;
  margin: 20px auto 0;
  border-radius: var(--rd-md);
  box-shadow: var(--shadow-sm);
}

.page-about .about-tax__tag-level {
  border-radius: var(--rd-md);
  padding: 10px;
  margin-bottom: 10px;
}

.page-about .about-tax__tag-level--hot {
  background: rgba(39, 174, 96, 0.08);
  border: 1px solid rgba(39, 174, 96, 0.25);
}

.page-about .about-tax__tag-level--mid {
  background: rgba(142, 68, 173, 0.08);
  border: 1px solid rgba(142, 68, 173, 0.25);
}

.page-about .about-tax__tag-level--low {
  background: rgba(127, 140, 141, 0.08);
  border: 1px solid rgba(127, 140, 141, 0.25);
}

.page-about .about-tax__tag-level-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.page-about .about-tax__tag-level-head strong {
  font-size: 14px;
  color: var(--c-ink);
}

.page-about .about-tax__tag-level-head .mono {
  font-size: 13px;
}

.page-about .about-tax__tag-level-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .about-tax__cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 12px;
  background: rgba(27, 138, 138, 0.05);
  border-radius: var(--rd-md);
  border: 1px dashed rgba(27, 138, 138, 0.3);
}

/* ===== 更新机制与批次 ===== */
.page-about .about-update {
  background: var(--c-magenta);
  color: var(--c-cream);
}

.page-about .about-update .section-head {
  background: transparent;
  border-bottom: 2px solid rgba(230, 185, 79, 0.5);
  border-radius: 0;
  padding: 0 0 10px;
  margin-bottom: 20px;
}

.page-about .about-update .section-head__title {
  color: var(--c-cream);
}

.page-about .about-update .section-head__meta {
  color: var(--c-mustard);
}

.page-about .about-update__inner {
  display: grid;
  gap: 20px;
  max-width: 1200px;
  margin: 0 auto;
}

.page-about .about-update__steps {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-update__step {
  display: flex;
  gap: 14px;
  background: rgba(255, 246, 233, 0.08);
  border-radius: var(--rd-md);
  padding: 14px;
  border-left: 3px solid var(--c-mustard);
}

.page-about .about-update__step-num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--c-mustard);
  line-height: 1.2;
}

.page-about .about-update__step-body h3 {
  color: var(--c-cream);
  font-size: 16px;
  margin: 0 0 4px;
}

.page-about .about-update__step-body p {
  font-size: 13px;
  line-height: 1.55;
  color: rgba(250, 243, 224, 0.88);
  margin: 0;
}

.page-about .about-update__side {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .about-update__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 800px;
  border-radius: var(--rd-md);
  box-shadow: var(--shadow-md);
}

.page-about .about-update__facts {
  background: rgba(255, 246, 233, 0.1);
  border-radius: var(--rd-md);
  padding: 12px;
  margin: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-update__fact {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 14px;
}

.page-about .about-update__fact dt {
  color: rgba(250, 243, 224, 0.8);
}

.page-about .about-update__fact dd {
  margin: 0;
  font-weight: 700;
  color: var(--c-mustard);
}

.page-about .about-update__versions {
  background: rgba(0, 0, 0, 0.12);
  border-radius: var(--rd-md);
  padding: 14px;
}

.page-about .about-update__versions h3 {
  color: var(--c-cream);
  font-size: 15px;
  margin: 0 0 10px;
}

.page-about .about-update__version-track {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-update__version {
  border-radius: 999px;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  border: 1px solid var(--c-grayblue);
  color: rgba(250, 243, 224, 0.85);
}

.page-about .about-update__version--current {
  background: var(--c-mustard);
  color: var(--c-ochre);
  border: 1px solid var(--c-mustard);
}

.page-about .about-update__version-arrow {
  color: var(--c-mustard);
  font-size: 14px;
}

.page-about .about-update__versions-note {
  font-size: 13px;
  line-height: 1.6;
  color: rgba(250, 243, 224, 0.85);
  margin: 12px 0 0;
}

/* ===== 与其他入口的关系 ===== */
.page-about .about-rel {
  background: var(--about-magenta-soft);
}

.page-about .about-rel .section-head {
  margin-bottom: 20px;
}

.page-about .about-rel__map {
  display: grid;
  gap: 16px;
}

.page-about .about-rel__hub {
  background: var(--c-magenta);
  color: var(--c-cream);
  border-radius: var(--rd-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  align-items: center;
  justify-content: center;
  text-align: center;
  box-shadow: var(--shadow-md);
}

.page-about .about-rel__hub-tag {
  background: var(--c-mustard);
  color: var(--c-ochre);
  font-size: 12px;
  font-weight: 700;
  border-radius: 999px;
  padding: 2px 10px;
}

.page-about .about-rel__hub strong {
  font-size: 22px;
  color: var(--c-cream);
  line-height: 1.3;
}

.page-about .about-rel__hub > span:last-child {
  font-size: 13px;
  line-height: 1.5;
  opacity: 0.9;
}

.page-about .about-rel__spokes {
  display: grid;
  gap: 12px;
}

.page-about .about-rel__spoke {
  display: flex;
  gap: 12px;
  align-items: center;
  background: var(--color-surface);
  border: 1px solid rgba(181, 72, 106, 0.25);
  border-radius: var(--rd-md);
  padding: 14px;
  color: var(--color-text);
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.page-about .about-rel__spoke:hover,
.page-about .about-rel__spoke:focus-visible {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.page-about .about-rel__spoke-icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  background: var(--c-magenta);
  color: var(--c-cream);
  font-size: 18px;
  font-weight: 700;
  border-radius: 8px;
}

.page-about .about-rel__spoke:nth-child(2) .about-rel__spoke-icon {
  background: var(--c-blue);
}

.page-about .about-rel__spoke:nth-child(3) .about-rel__spoke-icon {
  background: var(--c-teal);
}

.page-about .about-rel__spoke:nth-child(4) .about-rel__spoke-icon {
  background: var(--c-orange);
}

.page-about .about-rel__spoke-body strong {
  display: block;
  font-size: 15px;
  color: var(--c-ochre);
  margin-bottom: 2px;
}

.page-about .about-rel__spoke-body span {
  font-size: 13px;
  line-height: 1.5;
  color: var(--color-muted);
}

/* ===== 平板布局 ===== */
@media (min-width: 720px) {
  .page-about .about-section {
    padding: 40px 24px;
  }

  .page-about .about-survey__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .about-survey__stats {
    grid-template-columns: repeat(5, 1fr);
  }

  .page-about .about-survey__stat:last-child {
    grid-column: auto;
  }

  .page-about .about-update__steps {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .about-rel__spokes {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ===== 桌面布局 ===== */
@media (min-width: 960px) {
  .page-about .about-section {
    padding: 48px 24px;
  }

  .page-about .about-hero {
    padding: 36px 24px 48px;
  }

  .page-about .about-hero h1 {
    font-size: 2.4rem;
  }

  .page-about .about-survey__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-tax__layout {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }

  .page-about .about-update__inner {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: start;
  }

  .page-about .about-rel__map {
    grid-template-columns: 0.8fr 1.2fr;
    align-items: stretch;
  }
}