.page-about {
  --ab-pad: 20px;
  --ab-max: 1240px;
  display: block;
  padding-bottom: 56px;
  color: var(--cream);
  background: var(--ink);
}

.page-about .breadcrumbs {
  max-width: var(--ab-max);
  margin: 0 auto;
  padding: 18px var(--ab-pad) 4px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}

.page-about .breadcrumbs__item {
  color: var(--muted);
  text-decoration: none;
}

.page-about .breadcrumbs__item[aria-current="page"] {
  color: var(--cyan);
}

.page-about .breadcrumbs__sep {
  color: var(--line);
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: 24px var(--ab-pad) 48px;
  border-bottom: 4px solid var(--line);
  background:
    radial-gradient(130% 100% at 90% -20%, rgba(0, 229, 195, 0.16), transparent 62%),
    linear-gradient(170deg, #0a241e 0%, #061a16 46%, #04110e 100%);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(118deg, rgba(23, 68, 58, 0.5) 0 1px, transparent 1px 38px);
  pointer-events: none;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  right: -110px;
  top: -80px;
  width: 320px;
  height: 320px;
  border: 3px solid var(--line);
  transform: rotate(16deg);
  pointer-events: none;
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 1;
  max-width: var(--ab-max);
  margin: 0 auto;
  display: grid;
  gap: 30px;
}

.page-about .ab-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(38px, 9.6vw, 84px);
  line-height: 0.96;
  letter-spacing: -0.025em;
  color: var(--cream);
}

.page-about .ab-hero__title span {
  display: block;
  color: var(--cyan);
}

.page-about .ab-hero__lede {
  margin: 20px 0 0;
  max-width: 60ch;
  font-size: 17px;
  line-height: 1.8;
  color: var(--cream);
  opacity: 0.9;
}

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

.page-about .ab-stamp {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  margin: 0;
  padding: 8px 14px;
  border: 3px solid var(--orange);
  color: var(--orange);
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1;
  box-shadow: var(--shadow-hard);
  transform: rotate(-1.6deg);
}

.page-about .ab-stamp span {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cream);
  opacity: 0.75;
}

.page-about .ab-facts {
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 2px solid var(--line);
}

.page-about .ab-facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 14px;
  background: var(--surface);
}

.page-about .ab-facts__row dt {
  font-size: 13px;
  color: var(--muted);
}

.page-about .ab-facts__row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--cyan);
}

.page-about .ab-index {
  margin-top: 20px;
  padding: 16px 16px 8px;
  border: 3px solid var(--line);
  background: rgba(12, 42, 36, 0.88);
  box-shadow: var(--shadow-soft);
}

.page-about .ab-index__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .ab-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
}

.page-about .ab-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  min-height: 48px;
  box-sizing: border-box;
  padding: 11px 2px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--cream);
  text-decoration: none;
  border-bottom: 1px dashed var(--line);
}

.page-about .ab-index__list li:last-child .ab-index__link {
  border-bottom: 0;
}

.page-about .ab-index__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
}

.page-about .ab-index__link:hover {
  color: var(--cyan);
}

.page-about .ab-index__link:focus-visible {
  outline: 3px solid var(--orange);
  outline-offset: 2px;
}

/* ---------- 章节骨架 ---------- */

.page-about .ab-section {
  max-width: var(--ab-max);
  margin: 0 auto;
  padding: 52px var(--ab-pad);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-num {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(54px, 15vw, 118px);
  line-height: 0.78;
  letter-spacing: -0.05em;
  color: var(--line);
  -webkit-text-stroke: 1.5px rgba(0, 229, 195, 0.5);
}

.page-about .ab-h2 {
  margin: 8px 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(26px, 6vw, 42px);
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--cream);
}

.page-about .ab-lede {
  margin: 0;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--cream);
  opacity: 0.88;
}

.page-about .ab-lede--after {
  margin-top: 22px;
  padding-left: 14px;
  border-left: 4px solid var(--orange);
  opacity: 1;
}

/* ---------- 历程时间轴 ---------- */

.page-about .ab-history {
  display: grid;
  gap: 26px;
  margin-top: 30px;
}

.page-about .ab-figure {
  margin: 0;
  border: 3px solid var(--line);
  background: var(--ink-deep);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

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

.page-about .ab-figure figcaption {
  padding: 10px 12px;
  border-top: 2px solid var(--line);
  background: rgba(12, 42, 36, 0.92);
}

.page-about .ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
  display: grid;
  gap: 14px;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 6px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--cyan-soft) 55%, var(--orange) 100%);
}

.page-about .ab-node {
  position: relative;
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: -23px;
  top: 17px;
  width: 14px;
  height: 14px;
  background: var(--orange);
  border: 3px solid var(--ink);
  box-shadow: 0 0 0 3px var(--line);
}

.page-about .ab-node details {
  border: 2px solid var(--line);
  background: var(--surface);
}

.page-about .ab-node details[open] {
  box-shadow: var(--shadow-soft);
  border-color: var(--cyan);
}

.page-about .ab-node summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  min-height: 48px;
  box-sizing: border-box;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  color: var(--cream);
}

.page-about .ab-node summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-node summary:focus-visible {
  outline: 3px solid var(--orange);
  outline-offset: 2px;
}

.page-about .ab-node summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--orange);
}

.page-about .ab-node details[open] summary::after {
  content: "−";
  color: var(--cyan);
}

.page-about .ab-node__year {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--cyan);
}

.page-about .ab-node__name {
  font-family: var(--font-display);
  font-size: 21px;
  letter-spacing: 0.01em;
}

.page-about .ab-node p {
  margin: 0;
  padding: 0 16px 16px;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--cream);
  opacity: 0.85;
}

/* ---------- 数据带 ---------- */

.page-about .ab-band {
  margin-top: 28px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 3px solid var(--line);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-band__cell {
  padding: 16px 14px;
  background: var(--ink-deep);
}

.page-about .ab-band__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(21px, 5.6vw, 29px);
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .ab-band__label {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--muted);
}

/* ---------- 双栏说明 ---------- */

.page-about .ab-split {
  margin-top: 24px;
  display: grid;
  gap: 16px;
}

.page-about .ab-panel {
  padding: 20px 18px;
  border: 3px solid var(--line);
  background: var(--surface);
  box-shadow: var(--shadow-soft);
}

.page-about .ab-panel__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 21px;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .ab-panel ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 11px;
}

.page-about .ab-panel li {
  position: relative;
  padding-left: 20px;
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--cream);
  opacity: 0.9;
}

.page-about .ab-panel li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 9px;
  height: 2px;
  background: var(--orange);
}

/* ---------- 折线图 ---------- */

.page-about .ab-chartwrap {
  margin: 24px 0 0;
  padding: 16px 14px 10px;
  border: 3px solid var(--line);
  background: var(--ink-deep);
  box-shadow: var(--shadow-soft);
}

.page-about .ab-chart {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .ab-chart__grid {
  stroke: var(--line);
  stroke-width: 1;
  stroke-dasharray: 4 7;
}

.page-about .ab-chart__line {
  fill: none;
  stroke: var(--cyan);
  stroke-width: 4;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.page-about .ab-chart__dot {
  fill: var(--orange);
}

.page-about .ab-chart__axis {
  fill: var(--muted);
  font-family: var(--font-mono);
  font-size: 14px;
}

.page-about .ab-chartwrap figcaption {
  margin-top: 8px;
  padding-left: 2px;
}

/* ---------- 团队卡片 ---------- */

.page-about .ab-crew {
  margin-top: 26px;
  display: grid;
  gap: 16px;
}

.page-about .ab-crew__card {
  position: relative;
  padding: 22px 18px 20px 24px;
  border: 3px solid var(--line);
  background: var(--surface);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-crew__card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 6px;
  background: var(--cyan);
}

.page-about .ab-crew__no {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--orange);
}

.page-about .ab-crew__name {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 23px;
  letter-spacing: 0.01em;
  color: var(--cream);
}

.page-about .ab-crew__desc {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--cream);
  opacity: 0.86;
}

.page-about .ab-figure--night {
  margin-top: 26px;
  border-color: var(--caramel);
}

/* ---------- 米白阅读区 ---------- */

.page-about .ab-section--cream {
  max-width: none;
  padding: 0;
  border-bottom: 0;
  background: var(--cream);
  color: #0f211c;
}

.page-about .ab-cream__inner {
  max-width: var(--ab-max);
  margin: 0 auto;
  padding: 48px var(--ab-pad);
}

.page-about .ab-section--cream .ab-num {
  color: #d9d0b9;
  -webkit-text-stroke: 1.5px rgba(23, 68, 58, 0.45);
}

.page-about .ab-section--cream .ab-h2 {
  color: #0b1f1a;
}

.page-about .ab-section--cream .ab-lede {
  color: #1b332b;
  opacity: 1;
}

.page-about .ab-gates {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-gates li {
  position: relative;
  padding: 20px 18px 18px 62px;
  border: 2px solid rgba(11, 31, 26, 0.2);
  background: rgba(255, 255, 255, 0.6);
}

.page-about .ab-gates__no {
  position: absolute;
  left: 16px;
  top: 18px;
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--caramel);
}

.page-about .ab-gates h3 {
  margin: 0 0 9px;
  font-family: var(--font-display);
  font-size: 22px;
  letter-spacing: 0.01em;
  color: #0b1f1a;
}

.page-about .ab-gates p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: #1f3a32;
}

/* ---------- 合作 ---------- */

.page-about .ab-partners {
  margin-top: 26px;
  display: grid;
  gap: 16px;
}

.page-about .ab-partner {
  padding: 20px 18px;
  border: 3px solid var(--line);
  border-left: 8px solid var(--orange);
  background: var(--surface);
  box-shadow: var(--shadow-soft);
}

.page-about .ab-partner__count {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1;
  color: var(--orange);
}

.page-about .ab-partner__name {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 22px;
  letter-spacing: 0.01em;
  color: var(--cream);
}

.page-about .ab-partner p:last-child {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--cream);
  opacity: 0.86;
}

.page-about .ab-figure--wide {
  margin-top: 24px;
}

/* ---------- 旧版入口 ---------- */

.page-about .ab-legacy {
  margin-top: 26px;
  padding: 22px 18px;
  display: grid;
  gap: 18px;
  border: 3px dashed var(--orange);
  background: rgba(255, 138, 61, 0.07);
}

.page-about .ab-legacy__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--cream);
}

.page-about .ab-legacy .btn {
  justify-self: start;
}

/* ---------- 结尾 ---------- */

.page-about .ab-outro {
  max-width: var(--ab-max);
  margin: 0 auto;
  padding: 54px var(--ab-pad) 8px;
}

.page-about .ab-outro__panel {
  padding: 28px 20px;
  border: 4px solid var(--cyan);
  background: linear-gradient(135deg, rgba(0, 229, 195, 0.13), rgba(255, 138, 61, 0.09));
  box-shadow: var(--shadow-hard);
}

.page-about .ab-outro__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 断点 ---------- */

@media (min-width: 820px) {
  .page-about .breadcrumbs {
    padding: 20px 32px 4px;
  }

  .page-about .ab-hero {
    padding: 42px 32px 68px;
  }

  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.5fr) minmax(288px, 0.82fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .ab-section {
    padding: 64px 32px;
  }

  .page-about .ab-section--cream {
    padding: 0;
  }

  .page-about .ab-cream__inner {
    padding: 62px 32px;
  }

  .page-about .ab-history {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
    gap: 32px;
  }

  .page-about .ab-band {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-split {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .ab-crew {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .ab-gates {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .ab-gates li {
    padding: 22px 18px 20px 18px;
  }

  .page-about .ab-gates__no {
    position: static;
    display: block;
    margin-bottom: 10px;
  }

  .page-about .ab-partners {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .ab-legacy {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 28px;
  }

  .page-about .ab-outro {
    padding: 68px 32px 12px;
  }

  .page-about .ab-outro__panel {
    padding: 40px 36px;
  }
}

@media (min-width: 1120px) {
  .page-about .ab-hero__title {
    font-size: clamp(64px, 6.4vw, 96px);
  }

  .page-about .ab-figure img {
    max-height: 460px;
  }

  .page-about .ab-figure--night img {
    max-height: 420px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
    animation: none !important;
  }
}
<<<END>>>