.page-about {
  --ab-hair: rgba(224, 178, 121, 0.28);
  --ab-soft: #c9c1b2;
  --ab-card: #fffdf8;
  background: var(--paper);
  color: var(--rock);
  overflow-x: hidden;
}

/* ===== 首屏 ===== */
.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--paper);
  padding: 96px 0 56px;
}

.page-about .ab-hero__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.4;
  z-index: 0;
}

.page-about .ab-hero__veil {
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    radial-gradient(120% 90% at 88% 10%, rgba(255, 74, 23, 0.28), transparent 62%),
    linear-gradient(180deg, rgba(11, 11, 15, 0.55) 0%, rgba(11, 11, 15, 0.86) 58%, var(--ink) 100%);
}

.page-about .ab-hero__grain {
  z-index: 2;
  opacity: 0.45;
}

.page-about .ab-hero__inner {
  position: relative;
  z-index: 3;
}

.page-about .ab-crumbs {
  margin-bottom: 22px;
  font-size: 13px;
  color: var(--gobi);
}

.page-about .ab-crumbs a {
  color: var(--sand);
  text-decoration: none;
}

.page-about .ab-crumbs a:hover {
  color: var(--lava);
}

.page-about .ab-hero__eyebrow {
  color: var(--sand);
  margin: 0 0 14px;
}

.page-about .ab-hero h1 {
  margin: 0;
  max-width: 15em;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(30px, 7.4vw, 62px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .ab-hero h1::after {
  content: "";
  display: block;
  width: 72px;
  height: 6px;
  margin-top: 22px;
  border-radius: var(--r-pill);
  background: linear-gradient(90deg, var(--neon), var(--lava));
}

.page-about .ab-hero__lead {
  margin: 24px 0 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ab-soft);
}

.page-about .ab-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 18px 26px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-fact {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding-left: 14px;
  border-left: 2px solid var(--neon);
}

.page-about .ab-fact__k {
  font-family: var(--font-mono);
  font-size: 20px;
  letter-spacing: 0.04em;
  color: var(--sand);
  line-height: 1.1;
}

.page-about .ab-fact__v {
  font-size: 12px;
  color: var(--gobi);
  letter-spacing: 0.06em;
}

.page-about .ab-hero__watermark {
  position: absolute;
  right: -0.06em;
  bottom: -0.24em;
  z-index: 2;
  font-size: clamp(200px, 52vw, 520px);
  line-height: 0.7;
  font-weight: 900;
  color: transparent;
  -webkit-text-stroke: 1.5px rgba(255, 74, 23, 0.22);
  pointer-events: none;
  user-select: none;
}

/* ===== 章节共用 ===== */
.page-about .ab-coord {
  padding-top: 56px;
}

.page-about .sec-head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 26px;
}

.page-about .sec-head__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--neon);
}

.page-about .section--ink .sec-head__num,
.page-about .section--carbon .sec-head__num {
  color: var(--lava);
}

.page-about .sec-head__title {
  margin: 0;
  font-size: 22px;
  line-height: 1.35;
  font-weight: 700;
  border-left: 3px solid var(--sand);
  padding-left: 14px;
}

/* ===== 坐标 / 空间 ===== */
.page-about .ab-coord__grid {
  display: grid;
  gap: 28px;
}

.page-about .ab-coord__text p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.8;
}

.page-about .ab-route {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-route li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--paper-2);
  font-size: 15px;
  line-height: 1.7;
}

.page-about .ab-route__n {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--sand);
}

.page-about .ab-coord__figure {
  margin: 0;
}

.page-about .ab-coord__figure .media {
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .ab-coord__cap {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gobi);
}

/* 平面示意 */
.page-about .ab-plan {
  margin-top: 44px;
}

.page-about .ab-plan__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 18px;
  margin-bottom: 16px;
}

.page-about .ab-plan__title {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
}

.page-about .ab-plan__hint {
  margin: 0;
  font-size: 13px;
  color: var(--gobi);
}

.page-about .ab-plan__track {
  display: flex;
  gap: 14px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding: 4px 0 16px;
  margin-inline: -24px;
  padding-inline: 24px;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-zone {
  flex: 0 0 78%;
  scroll-snap-align: start;
  background: var(--ab-card);
  border: 1px solid var(--paper-2);
  border-radius: var(--r-lg);
  padding: 20px 18px;
  transition: transform 220ms var(--ease), border-color 220ms var(--ease), box-shadow 220ms var(--ease);
}

.page-about .ab-zone:hover,
.page-about .ab-zone:focus-within {
  transform: translateY(-3px);
  border-color: var(--neon);
  box-shadow: 0 14px 30px rgba(74, 59, 49, 0.12);
}

.page-about .ab-zone__n {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--neon);
}

.page-about .ab-zone__name {
  margin: 8px 0 6px;
  font-size: 18px;
  font-weight: 700;
  color: var(--rock);
}

.page-about .ab-zone__use {
  margin: 0 0 10px;
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--r-pill);
  border: 1px solid var(--ab-hair);
  font-size: 12px;
  color: var(--rock);
  background: rgba(224, 178, 121, 0.12);
}

.page-about .ab-zone__more {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: #6b5c4d;
}

/* ===== 时间路标 ===== */
.page-about .ab-milestones {
  position: relative;
  background: var(--ink);
  color: var(--paper);
  padding-top: 60px;
  padding-bottom: 60px;
}

.page-about .ab-milestones .sec-head__title {
  color: var(--paper);
}

.page-about .ab-timeline {
  position: relative;
  margin-top: 8px;
  padding-left: 36px;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 6px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, rgba(224, 178, 121, 0.1), var(--sand) 12%, var(--sand) 84%, rgba(224, 178, 121, 0.1));
}

.page-about .ab-node {
  position: relative;
  padding-bottom: 30px;
}

.page-about .ab-node:last-child {
  padding-bottom: 0;
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: -32px;
  top: 8px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--sand);
  box-shadow: 0 0 0 4px rgba(224, 178, 121, 0.14);
}

.page-about .ab-node__year {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 22px;
  letter-spacing: 0.08em;
  color: var(--sand);
  line-height: 1.1;
}

.page-about .ab-node__title {
  margin: 6px 0 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--paper);
  line-height: 1.4;
}

.page-about .ab-node__text {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ab-soft);
}

/* ===== 团队 ===== */
.page-about .ab-team__grid {
  display: grid;
  gap: 28px;
}

.page-about .ab-team__figure {
  margin: 0;
}

.page-about .ab-team__figure .media {
  border-radius: var(--r-lg);
  overflow: hidden;
}

.page-about .ab-team__cap {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gobi);
}

.page-about .ab-team__body > p {
  margin: 0 0 22px;
  font-size: 16px;
  line-height: 1.8;
}

.page-about .ab-crew {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .ab-crew__item {
  padding: 14px 16px;
  border-radius: var(--r-md);
  background: var(--ab-card);
  border: 1px solid var(--paper-2);
  border-left: 3px solid var(--sand);
}

.page-about .ab-crew__role {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--rock);
}

.page-about .ab-crew__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: #6b5c4d;
}

/* ===== 导览迭代 ===== */
.page-about .ab-wayfinder {
  position: relative;
  background: var(--carbon);
  color: var(--paper);
  padding-top: 60px;
  padding-bottom: 60px;
}

.page-about .ab-wayfinder .sec-head__title {
  color: var(--paper);
}

.page-about .ab-wayfinder__lead {
  margin: 0 0 28px;
  max-width: 42em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ab-soft);
}

.page-about .ab-cadence {
  margin: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-cadence__row {
  padding: 16px 18px;
  border-radius: var(--r-md);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(224, 178, 121, 0.18);
}

.page-about .ab-cadence__k {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--jade);
  margin-bottom: 8px;
}

.page-about .ab-cadence__d {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ab-soft);
}

.page-about .ab-wayfinder__acts {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-top: 28px;
}

.page-about .ab-wayfinder__note {
  margin: 0;
  flex: 1 1 220px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--gobi);
}

/* ===== 伙伴 ===== */
.page-about .ab-partners {
  position: relative;
  background: var(--ink);
  color: var(--paper);
  padding-top: 60px;
  padding-bottom: 64px;
}

.page-about .ab-partners .sec-head__title {
  color: var(--paper);
}

.page-about .ab-partners__grid {
  display: grid;
  gap: 24px;
}

.page-about .ab-partners__text p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ab-soft);
}

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

.page-about .ab-partners__item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding: 12px 0;
  border-top: 1px solid rgba(224, 178, 121, 0.2);
}

.page-about .ab-partners__k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--sand);
  min-width: 3em;
}

.page-about .ab-partners__v {
  font-size: 14px;
  line-height: 1.7;
  color: var(--paper);
}

.page-about .ab-next {
  margin-top: 40px;
  padding-top: 26px;
  border-top: 1px dashed rgba(224, 178, 121, 0.28);
}

.page-about .ab-next__title {
  margin: 0 0 16px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

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

/* ===== 右侧折叠路标 ===== */
.page-about .ab-rail {
  display: none;
}

/* ===== 平板及桌面 ===== */
@media (min-width: 720px) {
  .page-about .ab-hero {
    padding: 128px 0 72px;
  }

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

  .page-about .ab-plan__track {
    margin-inline: 0;
    padding-inline: 0;
    gap: 18px;
  }

  .page-about .ab-zone {
    flex: 0 0 45%;
  }

  .page-about .sec-head__title {
    font-size: 28px;
  }

  .page-about .ab-timeline {
    padding-left: 56px;
  }

  .page-about .ab-timeline::before {
    left: 16px;
  }

  .page-about .ab-node::before {
    left: -46px;
    width: 14px;
    height: 14px;
    top: 7px;
  }

  .page-about .ab-node__year {
    font-size: 26px;
  }

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

@media (min-width: 980px) {
  .page-about .ab-coord {
    padding-top: 80px;
  }

  .page-about .ab-coord__grid {
    grid-template-columns: 1.12fr 0.88fr;
    gap: 40px;
    align-items: start;
  }

  .page-about .ab-zone {
    flex: 0 0 30%;
  }

  .page-about .ab-team__grid {
    grid-template-columns: 0.72fr 1.28fr;
    gap: 40px;
    align-items: start;
  }

  .page-about .ab-crew {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .ab-partners__grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 44px;
    align-items: start;
  }

  .page-about .ab-milestones,
  .page-about .ab-wayfinder,
  .page-about .ab-partners {
    padding-top: 84px;
    padding-bottom: 84px;
  }
}

@media (min-width: 1180px) {
  .page-about .ab-rail {
    display: block;
    position: fixed;
    right: 24px;
    top: 150px;
    z-index: 20;
    width: 168px;
    padding: 12px 14px;
    border-radius: var(--r-md);
    background: rgba(23, 23, 30, 0.92);
    border: 1px solid rgba(224, 178, 121, 0.22);
    backdrop-filter: blur(6px);
  }

  .page-about .ab-rail__toggle {
    cursor: pointer;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.16em;
    color: var(--sand);
    list-style: none;
    margin-bottom: 8px;
  }

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

  .page-about .ab-rail__nav {
    display: grid;
    gap: 2px;
  }

  .page-about .ab-rail .chapter-link {
    display: block;
    padding: 5px 0;
    font-size: 12px;
    line-height: 1.5;
    color: var(--gobi);
    text-decoration: none;
    border-bottom: 1px solid rgba(224, 178, 121, 0.12);
    transition: color 200ms var(--ease), padding-left 200ms var(--ease);
  }

  .page-about .ab-rail .chapter-link:hover {
    color: var(--paper);
  }

  .page-about .ab-rail .chapter-link[aria-current="true"] {
    color: var(--neon);
    padding-left: 6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-zone {
    transition: none;
  }
}
<<<END>>>