.page-about {
  --ab-shell-top: clamp(40px, 6vw, 72px);
  --ab-sec-space: clamp(48px, 7vw, 88px);
  --ab-index-w: 172px;
  padding-bottom: clamp(56px, 8vw, 104px);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: 30px 0 52px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  top: -32%;
  right: -14%;
  width: 64%;
  height: 172%;
  background: linear-gradient(158deg, rgba(255, 107, 44, 0.28) 0%, rgba(255, 107, 44, 0) 64%);
  clip-path: polygon(36% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(180deg, rgba(90, 100, 114, 0.14) 0 1px, transparent 1px 48px),
    repeating-linear-gradient(90deg, rgba(90, 100, 114, 0.10) 0 1px, transparent 1px 48px);
  pointer-events: none;
  opacity: 0.75;
}

.page-about .ab-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

.page-about .ab-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-head);
  font-size: clamp(32px, 6.4vw, 58px);
  line-height: 1.04;
  letter-spacing: 0.015em;
  color: var(--cream);
  text-wrap: balance;
}

.page-about .ab-hero__lead {
  margin: 18px 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--cream-dim);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  overflow: hidden;
  align-self: start;
}

.page-about .ab-stat {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 16px 15px 18px;
  background: var(--ink-800);
}

.page-about .ab-stat__num {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: clamp(24px, 4.4vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  padding-bottom: 3px;
  border-bottom: 2px solid rgba(31, 224, 192, 0.4);
}

.page-about .ab-stat__label {
  font-family: var(--font-head);
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--cream);
}

.page-about .ab-stat__note {
  font-size: 12px;
  line-height: 1.6;
  color: var(--graphite);
}

/* ---------- 主体骨架 ---------- */
.page-about .ab-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  padding-top: var(--ab-shell-top);
}

.page-about .ab-body {
  display: flex;
  flex-direction: column;
  gap: var(--ab-sec-space);
  min-width: 0;
}

.page-about .ab-sec {
  min-width: 0;
}

.page-about .ab-sec__head {
  margin-bottom: 24px;
}

.page-about .ab-sec__head .section__desc {
  max-width: 62ch;
  margin-top: 10px;
}

/* ---------- 章节索引 ---------- */
.page-about .ab-index {
  border-top: 2px solid var(--orange);
  padding-top: 12px;
  min-width: 0;
}

.page-about .ab-index__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--graphite);
}

.page-about .ab-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .ab-index__item {
  min-width: 0;
}

.page-about .ab-index__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 10px;
  font-size: 13px;
  line-height: 1.4;
  color: var(--cream-dim);
  text-decoration: none;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .ab-index__link:hover,
.page-about .ab-index__link:focus-visible {
  color: var(--cyan);
  border-color: var(--line-cyan);
}

.page-about .ab-index__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--graphite);
}

/* ---------- 奶油纸叙事区 ---------- */
.page-about .ab-paper {
  position: relative;
  padding: clamp(22px, 3.4vw, 42px);
  background:
    repeating-linear-gradient(0deg, rgba(26, 23, 20, 0.022) 0 1px, transparent 1px 22px),
    var(--cream);
  color: var(--brown);
  border-radius: var(--radius);
  border-left: 4px solid var(--gold-deep);
}

.page-about .ab-paper p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.86;
}

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

/* ---------- 图片 ---------- */
.page-about .ab-figure {
  margin: 28px 0 0;
  min-width: 0;
}

.page-about .ab-figure__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line-soft);
  background: var(--ink-800);
}

.page-about .ab-figure__cap {
  margin-top: 10px;
  padding-left: 12px;
  border-left: 2px solid var(--line-cyan);
  font-size: 12px;
  line-height: 1.65;
  color: var(--graphite);
}

.page-about .ab-figure--banner .ab-figure__img {
  aspect-ratio: 2 / 1;
}

/* ---------- 发展历程 ---------- */
.page-about .ab-timeline {
  margin-top: 8px;
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-timeline .accordion__item {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-timeline .accordion__trigger {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 17px 6px;
  background: none;
  border: 0;
  cursor: pointer;
  text-align: left;
  color: var(--cream);
  font-family: var(--font-head);
  font-size: clamp(16px, 2.2vw, 21px);
  letter-spacing: 0.04em;
  transition: color var(--dur) var(--ease);
}

.page-about .ab-timeline .accordion__trigger:hover,
.page-about .ab-timeline .accordion__trigger:focus-visible {
  color: var(--cyan);
}

.page-about .ab-timeline .accordion__idx {
  min-width: 72px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .ab-timeline .accordion__sign {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--graphite);
}

.page-about .ab-timeline .accordion__inner {
  padding: 0 6px 20px 92px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--cream-dim);
}

.page-about .ab-timeline .accordion__inner p {
  margin: 0;
}

/* ---------- 团队与治理 ---------- */
.page-about .ab-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-about .ab-team .ab-figure {
  margin-top: 0;
}

.page-about .ab-team__list {
  display: flex;
  flex-direction: column;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .ab-team__card {
  padding: 20px 20px 22px;
  background: var(--ink-800);
  border-left: 3px solid transparent;
}

.page-about .ab-team__card:nth-child(1) { border-left-color: var(--cyan); }
.page-about .ab-team__card:nth-child(2) { border-left-color: var(--gold); }
.page-about .ab-team__card:nth-child(3) { border-left-color: var(--orange); }

.page-about .ab-team__idx {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .ab-team__name {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 19px;
  letter-spacing: 0.04em;
  color: var(--cream);
}

.page-about .ab-team__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--cream-dim);
}

/* ---------- 覆盖与节奏 ---------- */
.page-about .ab-coverage {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-about .ab-coverage__table {
  min-width: 0;
  overflow-x: auto;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
}

.page-about .ab-coverage__table .data-table {
  width: 100%;
  min-width: 460px;
  border-collapse: collapse;
  font-size: 13.5px;
}

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

.page-about .ab-coverage__table thead th {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--graphite);
  background: var(--ink-800);
  white-space: nowrap;
}

.page-about .ab-coverage__table tbody th {
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.03em;
  color: var(--cream);
}

.page-about .ab-coverage__table tbody td {
  color: var(--cream-dim);
  line-height: 1.7;
}

.page-about .ab-coverage__table tbody tr:last-child th,
.page-about .ab-coverage__table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .ab-coverage__table .data-table__num {
  font-family: var(--font-mono);
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .ab-bars {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 20px;
  background: var(--ink-800);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
}

.page-about .ab-bars__title {
  margin: 0 0 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--graphite);
}

.page-about .ab-bar {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr) 42px;
  align-items: center;
  gap: 12px;
}

.page-about .ab-bar__label {
  font-size: 13px;
  color: var(--cream-dim);
}

.page-about .ab-bar__track {
  display: block;
  height: 10px;
  border-radius: 999px;
  background: rgba(90, 100, 114, 0.24);
  overflow: hidden;
}

.page-about .ab-bar__fill {
  display: block;
  height: 100%;
  border-radius: 999px;
}

.page-about .ab-bar__fill--a {
  width: 100%;
  background: linear-gradient(90deg, var(--teal), var(--cyan));
}

.page-about .ab-bar__fill--b {
  width: 50%;
  background: linear-gradient(90deg, var(--gold-deep), var(--gold));
}

.page-about .ab-bar__fill--c {
  width: 21%;
  background: linear-gradient(90deg, var(--warm-red), var(--orange));
}

.page-about .ab-bar__val {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  text-align: right;
  color: var(--cream);
}

.page-about .ab-rhythm {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .ab-rhythm__item {
  padding: 18px 18px 20px;
  background: var(--ink-800);
}

.page-about .ab-rhythm__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.05;
  color: var(--orange);
}

.page-about .ab-rhythm__unit {
  display: block;
  margin-top: 2px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--graphite);
}

.page-about .ab-rhythm__text {
  display: block;
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.68;
  color: var(--cream-dim);
}

/* ---------- 选择理由与收尾 ---------- */
.page-about .ab-why {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px;
}

.page-about .ab-why__card {
  padding: 22px 20px 24px;
  background: var(--ink-800);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .ab-why__card:hover {
  border-color: var(--line-gold);
  transform: translateY(-2px);
}

.page-about .ab-why__idx {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-about .ab-why__name {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 20px;
  letter-spacing: 0.04em;
  color: var(--cream);
}

.page-about .ab-why__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--cream-dim);
}

.page-about .ab-cta {
  margin-top: 26px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  padding: clamp(22px, 3.2vw, 34px);
  border: 1px solid var(--line-cyan);
  border-radius: var(--radius);
  background: linear-gradient(120deg, rgba(31, 224, 192, 0.10), rgba(255, 107, 44, 0.10));
}

.page-about .ab-cta__title {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: clamp(19px, 2.6vw, 25px);
  letter-spacing: 0.03em;
  color: var(--cream);
}

.page-about .ab-cta__desc {
  margin: 0;
  max-width: 58ch;
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--cream-dim);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
}

/* ---------- 桌面布局 ---------- */
@media (min-width: 760px) {
  .page-about .ab-team {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: 28px;
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero {
    padding: 40px 0 68px;
  }

  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 42px;
    align-items: end;
  }

  .page-about .ab-coverage {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 30px;
    align-items: start;
  }

  .page-about .ab-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 30px;
  }

  .page-about .ab-sec--narrow {
    max-width: 780px;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-shell {
    grid-template-columns: var(--ab-index-w) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 60px);
    align-items: start;
  }

  .page-about .ab-index {
    position: sticky;
    top: 88px;
    align-self: start;
  }

  .page-about .ab-index__list {
    flex-direction: column;
    gap: 0;
  }

  .page-about .ab-index__link {
    border: 0;
    border-bottom: 1px solid var(--line-soft);
    border-radius: 0;
    padding: 9px 6px 9px 0;
  }
}

/* ---------- 窄屏修正 ---------- */
@media (max-width: 640px) {
  .page-about .ab-timeline .accordion__trigger {
    flex-wrap: wrap;
    gap: 4px 12px;
  }

  .page-about .ab-timeline .accordion__idx {
    min-width: 0;
  }

  .page-about .ab-timeline .accordion__sign {
    margin-left: auto;
  }

  .page-about .ab-timeline .accordion__inner {
    padding: 0 6px 18px;
  }

  .page-about .ab-bar {
    grid-template-columns: 74px minmax(0, 1fr) 34px;
    gap: 10px;
  }

  .page-about .ab-hero__stats {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-why__card {
    transition: none;
  }

  .page-about .ab-why__card:hover {
    transform: none;
  }
}