.page-about {
  --about-container: 1200px;
  background: var(--bg-warm);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.6;
}

.page-about .about-wrap {
  width: min(100% - 32px, var(--about-container));
  margin-inline: auto;
}

.page-about .breadcrumb {
  display: flex;
  font-size: 13px;
  padding: 18px 0;
  color: var(--ink-soft);
}

.page-about .breadcrumb a {
  color: var(--c-blue);
  text-decoration: none;
}

.page-about .breadcrumb a:hover {
  color: var(--c-purple);
}

.page-about .breadcrumb__sep {
  margin: 0 8px;
  color: var(--line);
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--c-purple);
  margin: 0;
}

.page-about .about-kicker::before {
  content: "▚";
  color: var(--c-orange);
}

.page-about .about-section-head {
  margin-bottom: 28px;
}

.page-about .about-section-head h2 {
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  line-height: 1.2;
  margin: 8px 0 8px;
  letter-spacing: -0.01em;
}

.page-about .about-section-head p {
  color: var(--ink-soft);
  max-width: 780px;
  margin: 0;
}

/* ============ Hero ============ */
.page-about .about-hero {
  position: relative;
  padding: 40px 0 48px;
  background:
    radial-gradient(circle at 85% 20%, rgba(255, 209, 102, .22), transparent 42%),
    radial-gradient(circle at 68% 82%, rgba(17, 138, 178, .14), transparent 40%),
    var(--bg-warm);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(transparent 95%, rgba(45, 45, 45, .07) 100%),
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 100% 24px, 24px 24px, 24px 24px;
  opacity: .55;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
  display: grid;
  gap: 32px;
}

.page-about .about-hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--c-purple);
  margin: 0 0 12px;
}

.page-about .about-hero__kicker::before {
  content: "▚";
  color: var(--c-orange);
}

.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-size: clamp(1.75rem, 5vw, 2.75rem);
  line-height: 1.2;
  margin: 0 0 16px;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lead {
  font-size: 16px;
  color: var(--ink-soft);
  max-width: 680px;
  margin: 0 0 20px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 22px;
}

.page-about .about-hero__actions .btn {
  margin: 0;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  max-width: 520px;
}

.page-about .about-hero__stat {
  background: var(--bg-cream);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .about-hero__stat-num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--ink);
  line-height: 1.1;
}

.page-about .about-hero__stat-label {
  font-size: 12px;
  color: var(--ink-soft);
}

.page-about .about-hero__toc {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}

.page-about .about-hero__toc a {
  font-size: 12px;
  color: var(--ink-soft);
  text-decoration: none;
  border: 1px solid var(--line);
  background: var(--white);
  border-radius: 999px;
  padding: 5px 14px;
  transition: border-color .2s ease, color .2s ease;
}

.page-about .about-hero__toc a:hover {
  border-color: var(--c-purple);
  color: var(--c-purple);
}

.page-about .about-hero__plate {
  background: var(--deep);
  border: 1px solid rgba(255, 255, 255, .12);
  border-radius: 18px;
  padding: 22px;
  display: grid;
  gap: 14px;
  box-shadow: var(--shadow-lg);
}

.page-about .about-hero__plate-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .about-hero__plate-cell {
  display: flex;
  flex-direction: column;
  justify-content: center;
  border-radius: 10px;
  padding: 14px 12px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.05rem;
  line-height: 1.3;
  color: #fff;
  background: rgba(255, 255, 255, .08);
  border-top: 3px solid var(--c-orange);
}

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

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

.page-about .about-hero__plate-cell--yellow {
  border-top-color: var(--c-yellow);
}

.page-about .about-hero__plate-cell--green {
  border-top-color: var(--c-green);
}

.page-about .about-hero__plate-cell--purple {
  border-top-color: var(--c-purple);
}

.page-about .about-hero__plate-note {
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(255, 255, 255, .72);
  text-align: center;
  letter-spacing: .06em;
}

/* ============ 收录规模 ============ */
.page-about .about-scale {
  padding: clamp(48px, 8vw, 80px) 0;
  background: var(--bg-air);
}

.page-about .about-scale__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-scale__card {
  position: relative;
  background: var(--white);
  border: 1px solid var(--line-soft);
  border-top: 4px solid var(--c-orange);
  border-radius: 12px;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  box-shadow: var(--shadow);
  min-height: 148px;
  transition: transform .2s ease, box-shadow .2s ease;
}

.page-about .about-scale__card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.page-about .about-scale__card--deep {
  background: var(--deep);
  border-color: var(--deep);
  color: #fff;
}

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

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

.page-about .about-scale__card--yellow {
  border-top-color: var(--c-yellow);
}

.page-about .about-scale__card--green {
  border-top-color: var(--c-green);
}

.page-about .about-scale__card--purple {
  border-top-color: var(--c-purple);
}

.page-about .about-scale__num {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.page-about .about-scale__card--deep .about-scale__num {
  color: var(--c-yellow);
}

.page-about .about-scale__unit {
  font-size: .65em;
  color: inherit;
  opacity: .7;
  margin-left: 4px;
}

.page-about .about-scale__name {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1rem;
}

.page-about .about-scale__tags {
  font-size: 12px;
  color: var(--ink-soft);
  letter-spacing: .02em;
}

.page-about .about-scale__card--deep .about-scale__tags {
  color: rgba(255, 255, 255, .72);
}

.page-about .about-scale__texture {
  margin: 20px 0 0;
}

.page-about .about-scale__texture img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--white);
}

/* ============ 分类与标签层级 ============ */
.page-about .about-taxonomy {
  padding: clamp(48px, 8vw, 80px) 0;
  background: var(--bg-cream);
}

.page-about .about-taxonomy__root {
  background: var(--deep);
  color: #fff;
  padding: 20px 24px;
  border-radius: var(--radius);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  box-shadow: var(--shadow-lg);
}

.page-about .about-taxonomy__root-name {
  font-family: var(--font-head);
  font-size: 1.2rem;
  font-weight: 700;
}

.page-about .about-taxonomy__root-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(255, 255, 255, .72);
}

.page-about .about-taxonomy__branches {
  display: grid;
  gap: 12px;
  margin-top: 20px;
}

.page-about .about-taxonomy__branch {
  position: relative;
  background: var(--white);
  border: 1px solid var(--line-soft);
  border-left: 4px solid var(--c-purple);
  border-radius: var(--radius);
  padding: 14px 16px;
  box-shadow: var(--shadow);
  transition: box-shadow .2s ease;
}

.page-about .about-taxonomy__branch:hover {
  box-shadow: var(--shadow-lg);
}

.page-about .about-taxonomy__branch--orange {
  border-left-color: var(--c-orange);
}

.page-about .about-taxonomy__branch--blue {
  border-left-color: var(--c-blue);
}

.page-about .about-taxonomy__branch--yellow {
  border-left-color: var(--c-yellow);
}

.page-about .about-taxonomy__branch--green {
  border-left-color: var(--c-green);
}

.page-about .about-taxonomy__branch--purple {
  border-left-color: var(--c-purple);
}

.page-about .about-taxonomy__branch-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 10px;
}

.page-about .about-taxonomy__branch-name {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.1rem;
}

.page-about .about-taxonomy__branch-count {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-soft);
  background: var(--bg-warm);
  border-radius: 999px;
  padding: 2px 10px;
  white-space: nowrap;
}

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

.page-about .about-taxonomy__branch-tags .tag {
  margin: 0;
}

.page-about .about-taxonomy__figure {
  margin: 24px 0 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--white);
}

.page-about .about-taxonomy__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-taxonomy__note {
  margin: 16px 0 0;
  font-size: 14px;
  color: var(--ink-soft);
  max-width: 720px;
}

/* ============ 索引总表 ============ */
.page-about .about-table {
  padding: clamp(48px, 8vw, 80px) 0;
  background: var(--bg-air);
}

.page-about .about-table .table-wrap {
  overflow-x: auto;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  background: var(--white);
}

.page-about .about-table .compare-table {
  width: 100%;
  min-width: 760px;
  border-collapse: collapse;
  font-size: 14px;
}

.page-about .about-table .compare-table th,
.page-about .about-table .compare-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--line-soft);
  text-align: left;
  vertical-align: middle;
}

.page-about .about-table .compare-table thead th {
  background: var(--deep);
  color: #fff;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 13px;
}

.page-about .about-table .compare-table tbody tr {
  background: var(--white);
}

.page-about .about-table .compare-table tbody tr:nth-child(even) {
  background: var(--bg-cream);
}

.page-about .about-table .compare-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .about-table .compare-table tbody tr:hover {
  background: var(--bg-air);
}

.page-about .about-table .compare-table .tag {
  margin: 0 4px 0 0;
}

.page-about .about-table .compare-table .status-badge {
  white-space: nowrap;
}

.page-about .about-table__num {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--ink);
}

/* ============ 更新批次机制 ============ */
.page-about .about-batches {
  padding: clamp(48px, 8vw, 80px) 0;
  background: var(--bg-warm);
}

.page-about .about-batches__timeline {
  display: grid;
  grid-template-columns: 60px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
}

.page-about .about-batches__deco {
  display: block;
  width: 60px;
  height: auto;
  max-height: 420px;
  object-fit: cover;
  border-radius: 10px;
  border: 1px solid var(--line-soft);
  background: var(--bg-cream);
}

.page-about .about-batches__list {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-batches__list::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 18px;
  bottom: 18px;
  width: 2px;
  background: var(--line);
}

.page-about .about-batches__item {
  position: relative;
  padding-left: 40px;
  margin-bottom: 20px;
  display: flex;
  align-items: flex-start;
}

.page-about .about-batches__item:last-child {
  margin-bottom: 0;
}

.page-about .about-batches__mark {
  position: absolute;
  left: 2px;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--white);
  border: 4px solid var(--c-green);
  box-sizing: border-box;
}

.page-about .about-batches__item--current .about-batches__mark {
  border-color: var(--c-new);
  box-shadow: 0 0 0 5px rgba(239, 71, 111, .14);
}

.page-about .about-batches__body {
  background: var(--white);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 100%;
  box-shadow: var(--shadow);
  transition: box-shadow .2s ease, border-color .2s ease;
}

.page-about .about-batches__item:hover .about-batches__body {
  box-shadow: var(--shadow-lg);
}

.page-about .about-batches__item--current .about-batches__body {
  border-color: rgba(239, 71, 111, .32);
}

.page-about .about-batches__id {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--c-purple);
  font-size: 15px;
}

.page-about .about-batches__item--current .about-batches__id {
  color: var(--c-new);
}

.page-about .about-batches__desc {
  color: var(--ink-soft);
  font-size: 14px;
}

/* ============ 检索与浏览方式 ============ */
.page-about .about-search {
  padding: clamp(48px, 8vw, 80px) 0;
  background: var(--bg-cream);
}

.page-about .about-search__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-search__item {
  background: var(--white);
  border: 1px solid var(--line-soft);
  border-bottom: 4px solid var(--c-purple);
  border-radius: var(--radius);
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  box-shadow: var(--shadow);
  transition: box-shadow .2s ease, transform .2s ease;
}

.page-about .about-search__item:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.page-about .about-search__item--filter {
  border-bottom-color: var(--c-purple);
}

.page-about .about-search__item--sort {
  border-bottom-color: var(--c-yellow);
}

.page-about .about-search__item--export {
  border-bottom-color: var(--c-blue);
}

.page-about .about-search__item--direct {
  border-bottom-color: var(--c-green);
}

.page-about .about-search__item--latest {
  border-bottom-color: var(--c-orange);
}

.page-about .about-search__item h3 {
  font-family: var(--font-head);
  font-size: 1.1rem;
  margin: 0;
}

.page-about .about-search__item p {
  color: var(--ink-soft);
  font-size: 14px;
  margin: 0;
}

.page-about .about-search__item .btn {
  align-self: flex-start;
  margin-top: auto;
}

.page-about .about-search__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .about-search__chips .tag {
  margin: 0;
}

/* ============ 入口速览 ============ */
.page-about .about-quickstart {
  padding: clamp(48px, 8vw, 80px) 0;
  background:
    linear-gradient(rgba(255, 255, 255, .04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .04) 1px, transparent 1px),
    var(--deep);
  background-size: 28px 28px;
}

.page-about .about-quickstart .about-section-head h2 {
  color: #fff;
}

.page-about .about-quickstart .about-kicker {
  color: var(--c-yellow);
}

.page-about .about-quickstart .about-section-head p {
  color: rgba(255, 255, 255, .68);
}

.page-about .about-quickstart__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-quickstart__card {
  background: rgba(255, 255, 255, .06);
  border: 1px solid rgba(255, 255, 255, .14);
  border-top: 3px solid var(--c-orange);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  text-decoration: none;
  color: #fff;
  transition: background .2s ease, transform .2s ease;
}

.page-about .about-quickstart__card:hover {
  background: rgba(255, 255, 255, .12);
  transform: translateY(-2px);
}

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

.page-about .about-quickstart__card--yellow {
  border-top-color: var(--c-yellow);
}

.page-about .about-quickstart__card--green {
  border-top-color: var(--c-green);
}

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

.page-about .about-quickstart__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 1.05rem;
  line-height: 1.3;
}

.page-about .about-quickstart__desc {
  font-size: 13px;
  color: rgba(255, 255, 255, .72);
  line-height: 1.55;
}

.page-about .about-quickstart__path {
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(255, 255, 255, .5);
  margin-top: auto;
}

/* ============ 桌面端增强 ============ */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 64px 0 72px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1fr) minmax(280px, 400px);
    align-items: center;
    gap: 48px;
  }

  .page-about .about-hero__lead {
    font-size: 17px;
  }

  .page-about .about-scale__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-taxonomy__branches {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-batches__timeline {
    grid-template-columns: 72px minmax(0, 1fr);
    gap: 24px;
  }

  .page-about .about-batches__deco {
    width: 72px;
  }

  .page-about .about-search__grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-search__item--filter,
  .page-about .about-search__item--sort {
    grid-column: span 3;
  }

  .page-about .about-search__item--export,
  .page-about .about-search__item--direct,
  .page-about .about-search__item--latest {
    grid-column: span 2;
  }

  .page-about .about-quickstart__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-scale__grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .about-scale__card {
    min-height: 170px;
  }

  .page-about .about-batches__timeline {
    grid-template-columns: 96px minmax(0, 1fr);
  }

  .page-about .about-batches__deco {
    width: 96px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-scale__card,
  .page-about .about-search__item,
  .page-about .about-quickstart__card,
  .page-about .about-hero__toc a {
    transform: none !important;
    transition: none !important;
  }
}