.page-about {
  --about-gap: clamp(56px, 8vw, 128px);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  line-height: 1.75;
  overflow-x: clip;
}

.page-about .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 22px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--slate);
}

.page-about .crumbs a {
  color: var(--slate);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .crumbs a:hover {
  color: var(--ochre);
  border-bottom-color: var(--ochre);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(40px, 7vw, 96px) 0 clamp(44px, 7vw, 96px);
  border-bottom: 1px solid var(--line-light);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: 0;
  top: 44px;
  width: 1px;
  height: clamp(120px, 22vh, 220px);
  background: linear-gradient(to bottom, var(--ochre), transparent);
  display: none;
}

.page-about .about-hero .eyebrow {
  color: var(--ochre);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 6vw, 72px);
  line-height: 1.02;
  letter-spacing: -0.01em;
  margin: 16px 0 22px;
  max-width: 15ch;
}

.page-about .about-hero .lede {
  max-width: 62ch;
  font-size: clamp(16px, 1.4vw, 18px);
  line-height: 1.75;
  color: var(--dim-on-light);
  margin: 0;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(32px, 5vw, 56px) 0 0;
  padding: 0;
  background: var(--line-light);
  border-top: 1px solid var(--line-light);
  border-bottom: 1px solid var(--line-light);
}

.page-about .about-hero__stats > div {
  background: var(--paper);
  padding: 18px 16px 20px;
  min-width: 0;
}

.page-about .about-hero__stats dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--slate);
  margin-bottom: 8px;
}

.page-about .about-hero__stats dd {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  font-size: clamp(24px, 3.4vw, 40px);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--ink);
}

/* ---------- 时间轴长卷 ---------- */

.page-about .about-rows {
  display: block;
}

.page-about .about-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  row-gap: 18px;
  padding: var(--about-gap) 0;
  border-bottom: 1px solid var(--line-light);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-row:last-child {
  border-bottom: 0;
}

.page-about .about-row__rail {
  display: flex;
  align-items: center;
  gap: 14px;
  align-self: start;
}

.page-about .about-row__season {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .12em;
  line-height: 1.4;
  color: var(--ochre);
  border: 1px solid currentColor;
  padding: 3px 9px;
}

.page-about .section-tick {
  display: block;
  width: 1px;
  height: 26px;
  background: var(--slate);
  transition: background var(--dur) var(--ease);
}

.page-about .about-row.is-in .section-tick {
  background: var(--whistle);
}

.page-about .about-row__body {
  min-width: 0;
  padding-bottom: 4px;
}

.page-about .about-h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 3.2vw, 40px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  margin: 0 0 22px;
  color: var(--ink);
}

.page-about .about-h2 .season-tag {
  display: inline-block;
  vertical-align: middle;
  margin-left: 14px;
  padding: 3px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .1em;
  color: var(--whistle);
  background: var(--indigo);
  opacity: 0;
  transform: translateX(-6px);
  transition: opacity 200ms var(--ease), transform 200ms var(--ease);
  pointer-events: none;
}

.page-about .about-h2:hover .season-tag,
.page-about .about-h2:focus-within .season-tag {
  opacity: 1;
  transform: none;
}

.page-about .about-row__body p {
  max-width: 66ch;
  margin: 0 0 1.15em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
}

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

.page-about .about-row__body a {
  color: var(--ochre);
  text-decoration: none;
  border-bottom: 1px solid var(--ochre-soft);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-row__body a:hover {
  color: var(--ochre-deep);
  border-bottom-color: var(--ochre-deep);
}

.page-about .about-note {
  padding: 16px 0 16px 18px;
  border-left: 2px solid var(--whistle);
  background: linear-gradient(to right, rgba(242,193,78,.09), transparent 70%);
}

/* ---------- 图 ---------- */

.page-about .about-figure {
  margin: 34px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line-light);
}

.page-about .about-figure figcaption {
  margin-top: 12px;
  padding-left: 12px;
  border-left: 2px solid var(--ochre);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.65;
  letter-spacing: .05em;
  color: var(--slate);
  max-width: 58ch;
}

.page-about .about-figure--bleed {
  margin-top: 28px;
}

/* ---------- 表格 ---------- */

.page-about .about-table {
  margin: 30px 0 26px;
}

.page-about .about-table .table-wrap {
  overflow-x: auto;
  border-top: 1px solid var(--ink);
}

.page-about .about-table .data-table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: 14px;
  line-height: 1.55;
}

.page-about .about-table .data-table thead th {
  text-align: left;
  padding: 12px 16px 12px 0;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--slate);
  border-bottom: 1px solid var(--ink);
  white-space: nowrap;
}

.page-about .about-table .data-table tbody th {
  text-align: left;
  padding: 14px 16px 14px 0;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 650;
  color: var(--ink);
  white-space: nowrap;
  vertical-align: top;
  border-bottom: 1px solid var(--line-light);
}

.page-about .about-table .data-table td {
  padding: 14px 0 14px 16px;
  color: var(--dim-on-light);
  vertical-align: top;
  border-bottom: 1px solid var(--line-light);
}

.page-about .about-table .data-table td:first-of-type {
  padding-left: 0;
}

.page-about .about-table .data-table tbody tr {
  transition: background var(--dur) var(--ease);
}

.page-about .about-table .data-table tbody tr:hover {
  background: rgba(179, 64, 42, .05);
}

/* ---------- 沿革时间线 ---------- */

.page-about .about-timeline {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  border-top: 1px solid var(--line-light);
}

.page-about .about-timeline li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line-light);
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 15px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--ochre);
}

.page-about .about-timeline h3 {
  margin: 0 0 6px;
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 650;
  line-height: 1.45;
  color: var(--ink);
}

.page-about .about-timeline p {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.7;
  color: var(--dim-on-light);
}

/* ---------- 资质 ---------- */

.page-about .about-cred {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  margin: 30px 0 28px;
}

.page-about .about-cred h3 {
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--ink);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-about .about-cred ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-cred li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line-light);
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink);
}

.page-about .about-cred li::before {
  content: "";
  flex: none;
  width: 8px;
  height: 1px;
  background: var(--ochre);
  transform: translateY(-5px);
}

/* ---------- 使用场景 ---------- */

.page-about .about-users {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  margin-top: 8px;
  border-top: 1px solid var(--ink);
}

.page-about .about-user {
  padding: 24px 0;
  border-bottom: 1px solid var(--line-light);
}

.page-about .about-user__num {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--ochre);
}

.page-about .about-user h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 650;
  line-height: 1.5;
  color: var(--ink);
}

.page-about .about-user p {
  margin: 0;
  max-width: 46ch;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--dim-on-light);
}

/* ---------- 收尾 ---------- */

.page-about .about-outro {
  margin: clamp(64px, 9vw, 120px) 0 clamp(48px, 7vw, 96px);
  padding: clamp(34px, 5vw, 64px) clamp(22px, 4vw, 56px);
  background: var(--indigo);
  color: var(--paper);
  border-left: 3px solid var(--ochre);
}

.page-about .about-outro .eyebrow {
  color: var(--whistle);
}

.page-about .about-outro h2 {
  margin: 10px 0 16px;
  max-width: 20ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.2vw, 38px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-outro p {
  max-width: 62ch;
  margin: 0 0 28px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--dim-on-dark);
}

.page-about .about-outro p a {
  color: var(--whistle);
  text-decoration: none;
  border-bottom: 1px solid rgba(242,193,78,.45);
  transition: border-color var(--dur) var(--ease);
}

.page-about .about-outro p a:hover {
  border-bottom-color: var(--whistle);
}

.page-about .about-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-outro .btn {
  display: inline-flex;
  align-items: center;
  padding: 13px 24px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .01em;
  line-height: 1;
  text-decoration: none;
  border: 1px solid transparent;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-outro .btn--primary {
  background: var(--ochre);
  color: var(--paper);
}

.page-about .about-outro .btn--primary:hover {
  background: var(--ochre-soft);
}

.page-about .about-outro .btn--ghost {
  background: transparent;
  color: var(--paper);
  border-color: rgba(244, 241, 234, .3);
}

.page-about .about-outro .btn--ghost:hover {
  color: var(--whistle);
  border-color: var(--whistle);
}

/* ---------- 焦点态 ---------- */

.page-about a:focus-visible,
.page-about .about-row__season:focus-visible {
  outline: 2px solid var(--whistle);
  outline-offset: 3px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-timeline li {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 28px;
    padding: 26px 0;
  }

  .page-about .about-timeline__year {
    padding-top: 2px;
  }

  .page-about .about-cred {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 44px;
  }

  .page-about .about-users {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    column-gap: 48px;
  }
}

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

@media (min-width: 900px) {
  .page-about .about-hero::after {
    display: block;
  }

  .page-about .about-row {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    column-gap: 40px;
    row-gap: 0;
  }

  .page-about .about-row__rail {
    grid-column: 1 / span 3;
    position: sticky;
    top: calc(var(--header-h) + 34px);
    display: block;
  }

  .page-about .about-row__body {
    grid-column: 4 / span 9;
  }

  .page-about .about-row__season {
    margin-bottom: 16px;
  }

  .page-about .about-figure--bleed {
    margin-top: 32px;
    margin-bottom: 32px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-rows {
    margin-top: 8px;
  }

  .page-about .about-figure--side {
    max-width: 82%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .section-tick,
  .page-about .about-h2 .season-tag,
  .page-about .about-outro .btn,
  .page-about .about-table .data-table tbody tr {
    transition: none;
  }

  .page-about .about-h2 .season-tag {
    transform: none;
  }
}