.page-about {
  background-color: var(--ink-900);
  color: var(--paper);
  overflow-x: hidden;
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 5vw, 56px) 0 clamp(48px, 8vw, 96px);
  border-bottom: 1px solid var(--hair-soft);
  background-color: var(--ink-900);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  right: -6%;
  top: -12%;
  width: min(74%, 900px);
  height: 132%;
  background:
    linear-gradient(202deg, rgba(31, 224, 208, 0.16) 0%, rgba(4, 18, 31, 0) 62%),
    linear-gradient(90deg, rgba(60, 90, 115, 0.28) 0%, rgba(60, 90, 115, 0) 100%);
  clip-path: polygon(26% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--line) 38%, transparent 100%);
  pointer-events: none;
}

.page-about .ab-hero__wrap {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero__crumbs {
  margin-bottom: clamp(20px, 4vw, 40px);
}

.page-about .ab-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 56px);
  align-items: start;
}

.page-about .ab-eyebrow {
  margin: 0 0 16px;
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .ab-eyebrow::before {
  content: "";
  width: 32px;
  height: 2px;
  background: var(--orange);
  flex: none;
}

.page-about .ab-eyebrow .mono {
  color: var(--cyan);
  letter-spacing: 0.1em;
}

.page-about .ab-hero__title {
  margin: 0 0 20px;
  font-family: var(--font-narrow);
  font-weight: 800;
  font-size: clamp(1.9rem, 6.4vw, 3.4rem);
  line-height: 1.12;
  letter-spacing: 0.01em;
  color: var(--paper);
  max-width: 18ch;
}

.page-about .ab-hero__lede {
  max-width: 60ch;
  color: var(--muted);
  margin: 0 0 clamp(24px, 4vw, 36px);
}

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

/* 概览账本 */

.page-about .ab-hero__ledger {
  border: 1px solid var(--hair);
  background: linear-gradient(180deg, rgba(10, 37, 64, 0.94) 0%, rgba(4, 18, 31, 0.88) 100%);
  padding: 20px 20px 22px;
  position: relative;
}

.page-about .ab-hero__ledger::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 56px;
  background: var(--cyan);
}

.page-about .ab-ledger__head {
  margin: 0 0 16px;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--muted);
  text-transform: uppercase;
}

.page-about .ab-ledger {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--hair-soft);
  border-top: 1px solid var(--hair-soft);
  border-bottom: 1px solid var(--hair-soft);
}

.page-about .ab-ledger li {
  background: rgba(4, 18, 31, 0.82);
  padding: 13px 12px;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
}

.page-about .ab-ledger__num {
  font-size: 1.32rem;
  font-weight: 700;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.page-about .ab-ledger__num--hot {
  color: var(--orange);
}

.page-about .ab-ledger__label {
  font-size: 0.84rem;
  color: var(--muted);
  letter-spacing: 0.06em;
}

.page-about .ab-ledger__foot {
  margin: 16px 0 0;
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--muted);
  line-height: 1.7;
}

/* ---------- 通用区块 ---------- */

.page-about .ab-section {
  padding: var(--step) 0;
  position: relative;
}

.page-about .ab-section--coord {
  background:
    linear-gradient(180deg, rgba(10, 37, 64, 0.55) 0%, rgba(4, 18, 31, 0) 100%);
}

.page-about .ab-section--timeline {
  border-top: 1px solid var(--hair-soft);
}

.page-about .ab-section--team {
  background: linear-gradient(180deg, rgba(10, 37, 64, 0.7) 0%, rgba(4, 18, 31, 0) 100%);
  border-top: 1px solid var(--hair-soft);
}

.page-about .ab-section--flow {
  border-top: 1px solid var(--hair-soft);
}

.page-about .ab-section--eco {
  background: linear-gradient(180deg, rgba(18, 59, 94, 0.42) 0%, rgba(4, 18, 31, 0) 100%);
  border-top: 1px solid var(--hair-soft);
}

.page-about .ab-section .section-head {
  margin-bottom: clamp(28px, 4.6vw, 52px);
}

.page-about .section-head__title {
  font-family: var(--font-narrow);
  font-weight: 800;
  letter-spacing: 0.01em;
  line-height: 1.16;
  font-size: clamp(1.5rem, 4.4vw, 2.4rem);
  margin: 8px 0 10px;
  max-width: 22ch;
}

.page-about .section-head__note {
  color: var(--muted);
  max-width: 62ch;
  margin: 0;
}

/* ---------- 01 坐标 ---------- */

.page-about .ab-coord {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 64px);
}

.page-about .ab-coord__text p {
  margin: 0 0 18px;
  max-width: 60ch;
  color: var(--paper);
}

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

.page-about .ab-axis {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--hair);
}

.page-about .ab-axis__item {
  border-bottom: 1px solid var(--hair-soft);
  padding: 18px 0 20px;
  position: relative;
}

.page-about .ab-axis__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 26px;
  width: 12px;
  height: 1px;
  background: var(--cyan);
}

.page-about .ab-axis__idx {
  display: block;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--muted);
  margin: 0 0 6px 22px;
}

.page-about .ab-axis__title {
  margin: 0 0 6px 22px;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-about .ab-axis__desc {
  margin: 0 0 0 22px;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--muted);
  max-width: 52ch;
}

/* ---------- 山城剪影通栏 ---------- */

.page-about .ab-skyline {
  position: relative;
  margin: 0;
  height: clamp(120px, 22vw, 220px);
  overflow: hidden;
  border-top: 1px solid var(--hair-soft);
  border-bottom: 1px solid var(--hair-soft);
  background-color: var(--ink-800);
}

.page-about .ab-skyline img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.36;
  filter: saturate(0.78) contrast(1.05);
  display: block;
}

.page-about .ab-skyline::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, var(--ink-900) 0%, rgba(4, 18, 31, 0.12) 46%, var(--ink-900) 100%);
  pointer-events: none;
}

.page-about .ab-skyline__cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 14px;
  z-index: 1;
  text-align: center;
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  color: var(--muted);
  text-transform: uppercase;
}

/* ---------- 02 时间线 ---------- */

.page-about .ab-tl {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 46px);
}

.page-about .ab-tl__visual {
  margin: 0;
  position: relative;
  border: 1px solid var(--hair-soft);
  background: var(--ink-800);
  overflow: hidden;
}

.page-about .ab-tl__visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  opacity: 0.9;
}

.page-about .ab-tl__visual figcaption {
  position: absolute;
  left: 14px;
  bottom: 12px;
  margin: 0;
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--glow);
  background: rgba(4, 18, 31, 0.7);
  padding: 5px 10px;
}

.page-about .ab-tl__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
  border-top: 1px solid var(--hair);
}

.page-about .ab-tl__list::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 26px;
  bottom: 26px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--cyan-deep) 26%, var(--line) 100%);
}

.page-about .ab-tl__item {
  position: relative;
  padding: 20px 0 22px;
  border-bottom: 1px solid var(--hair-soft);
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  transition: background-color var(--dur) var(--ease);
}

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 26px;
  width: 7px;
  height: 7px;
  background: var(--ink-900);
  border: 1px solid var(--cyan);
  transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .ab-tl__item:hover {
  background: rgba(31, 224, 208, 0.05);
}

.page-about .ab-tl__item:hover::before {
  background: var(--orange);
  border-color: var(--orange);
}

.page-about .ab-tl__year {
  margin: 0;
  font-size: 0.9rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
}

.page-about .ab-tl__title {
  margin: 0 0 6px;
  font-size: 1.02rem;
  letter-spacing: 0.03em;
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-tl__body p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--muted);
  max-width: 62ch;
}

/* ---------- 03 团队 ---------- */

.page-about .ab-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4.4vw, 52px);
  align-items: start;
}

.page-about .ab-team__media {
  margin: 0;
  position: relative;
  border: 1px solid var(--hair-soft);
  overflow: hidden;
}

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

.page-about .ab-team__media .media__coord {
  position: absolute;
  top: 12px;
  left: 12px;
  margin: 0;
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--glow);
  background: rgba(4, 18, 31, 0.72);
  padding: 5px 9px;
}

.page-about .ab-team__media .media__caption {
  display: block;
  padding: 10px 12px;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--muted);
  background: rgba(10, 37, 64, 0.9);
}

.page-about .ab-team__roles {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--hair);
}

.page-about .ab-role {
  border-bottom: 1px solid var(--hair-soft);
}

.page-about .ab-role summary {
  padding: 16px 4px;
  font-size: 1rem;
  letter-spacing: 0.03em;
  color: var(--paper);
  gap: 14px;
}

.page-about .ab-role summary .fold__idx {
  font-size: 0.78rem;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
  min-width: 2.2em;
  letter-spacing: 0.1em;
}

.page-about .ab-role__name {
  font-weight: 700;
}

.page-about .ab-role[open] summary {
  color: var(--cyan);
}

.page-about .ab-role .fold__body {
  padding: 0 4px 18px 4px;
}

.page-about .ab-role .fold__body p {
  margin: 0 0 0 2.4em;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--muted);
  max-width: 58ch;
}

/* ---------- 04 归档路径 ---------- */

.page-about .ab-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--hair-soft);
  border: 1px solid var(--hair-soft);
}

.page-about .ab-flow__step {
  background: linear-gradient(180deg, rgba(10, 37, 64, 0.7) 0%, rgba(4, 18, 31, 0.92) 100%);
  padding: 22px 20px 26px;
  position: relative;
}

.page-about .ab-flow__step::after {
  content: "";
  position: absolute;
  left: 20px;
  bottom: 0;
  width: 26px;
  height: 2px;
  background: var(--cyan-deep);
}

.page-about .ab-flow__idx {
  display: block;
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  color: var(--orange);
  margin-bottom: 12px;
  font-variant-numeric: tabular-nums;
}

.page-about .ab-flow__title {
  margin: 0 0 8px;
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--paper);
}

.page-about .ab-flow__desc {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.76;
  color: var(--muted);
}

.page-about .ab-audit {
  margin-top: clamp(24px, 3.4vw, 40px);
  border: 1px solid var(--hair-soft);
  border-left: 2px solid var(--cyan);
  padding: 20px 22px 22px;
  background: rgba(10, 37, 64, 0.42);
  display: grid;
  gap: 12px;
}

.page-about .ab-audit__label {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .ab-audit__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
}

.page-about .ab-audit__list li {
  font-size: 0.9rem;
  letter-spacing: 0.04em;
  color: var(--paper);
  padding-left: 14px;
  position: relative;
}

.page-about .ab-audit__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 1px;
  background: var(--orange);
}

.page-about .ab-audit__note {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 05 合作生态 ---------- */

.page-about .ab-eco {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 50px);
}

.page-about .ab-eco__title {
  margin: 0 0 16px;
  font-size: 0.82rem;
  letter-spacing: 0.18em;
  color: var(--muted);
  text-transform: uppercase;
  font-weight: 700;
}

.page-about .ab-tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .ab-tags li {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--hair);
  padding: 9px 13px;
  font-size: 0.84rem;
  letter-spacing: 0.04em;
  color: var(--paper);
  background: rgba(4, 18, 31, 0.5);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .ab-tags li::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--cyan);
  flex: none;
}

.page-about .ab-tags li:hover {
  border-color: var(--cyan);
  background: rgba(31, 224, 208, 0.08);
}

.page-about .ab-tags li .mono {
  color: var(--orange);
  font-size: 0.8rem;
}

.page-about .ab-eco__uses {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--hair);
}

.page-about .ab-eco__uses li {
  display: grid;
  grid-template-columns: 3em 1fr;
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--hair-soft);
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .ab-eco__uses-idx {
  color: var(--cyan);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  padding-top: 2px;
}

.page-about .ab-awards {
  margin-top: clamp(28px, 4vw, 48px);
  border: 1px solid var(--hair);
  padding: 24px 22px 22px;
  position: relative;
  background: linear-gradient(120deg, rgba(255, 122, 26, 0.06) 0%, rgba(4, 18, 31, 0) 60%);
}

.page-about .ab-awards::before {
  content: "";
  position: absolute;
  left: -1px;
  top: -1px;
  width: 64px;
  height: 3px;
  background: var(--orange);
}

.page-about .ab-awards__label {
  margin: 0 0 10px;
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--orange);
  text-transform: uppercase;
}

.page-about .ab-awards__lead {
  margin: 0 0 14px;
  font-size: 1.02rem;
  line-height: 1.7;
  color: var(--paper);
  letter-spacing: 0.02em;
  max-width: 46ch;
}

.page-about .ab-awards__fold {
  border-top: 1px solid var(--hair-soft);
}

.page-about .ab-awards__fold summary {
  padding: 13px 2px;
  font-size: 0.88rem;
  letter-spacing: 0.04em;
  color: var(--muted);
  gap: 10px;
}

.page-about .ab-awards__fold summary .fold__idx {
  color: var(--cyan);
  font-size: 0.9rem;
}

.page-about .ab-awards__fold .fold__body p {
  margin: 0 0 8px;
  font-size: 0.88rem;
  line-height: 1.78;
  color: var(--muted);
  max-width: 62ch;
}

/* ---------- 06 CTA ---------- */

.page-about .ab-section--cta {
  border-top: 1px solid var(--hair);
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(31, 224, 208, 0.14) 0%, rgba(4, 18, 31, 0) 58%),
    linear-gradient(180deg, rgba(10, 37, 64, 0.8) 0%, rgba(4, 18, 31, 0.95) 100%);
}

.page-about .ab-cta {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3.6vw, 44px);
  align-items: end;
}

.page-about .ab-cta__title {
  margin: 8px 0 12px;
  font-family: var(--font-narrow);
  font-weight: 800;
  font-size: clamp(1.4rem, 4vw, 2.1rem);
  line-height: 1.2;
  letter-spacing: 0.01em;
  color: var(--paper);
  max-width: 22ch;
}

.page-about .ab-cta__lede {
  margin: 0;
  color: var(--muted);
  max-width: 58ch;
}

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

.page-about .ab-cta__link {
  color: var(--cyan);
  font-size: 0.9rem;
}

/* ---------- 折叠组细节补充 ---------- */

.page-about .fold summary {
  display: flex;
  align-items: center;
  cursor: pointer;
}

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

.page-about .fold[open] .ab-role__name,
.page-about .fold[open] .ab-axis__title {
  color: var(--cyan);
}

/* ---------- 平板 ---------- */

@media (min-width: 700px) {
  .page-about .ab-flow {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .page-about .ab-tl__item {
    grid-template-columns: 128px 1fr;
    gap: 22px;
  }

  .page-about .ab-tl__year {
    padding-top: 3px;
  }

  .page-about .ab-cta {
    grid-template-columns: 1.35fr 1fr;
  }
}

/* ---------- 桌面 ---------- */

@media (min-width: 980px) {
  .page-about .ab-hero {
    padding-bottom: clamp(64px, 7vw, 112px);
  }

  .page-about .ab-hero__grid {
    grid-template-columns: 1.42fr 1fr;
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .ab-coord {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .ab-tl {
    grid-template-columns: 1fr;
  }

  .page-about .ab-team {
    grid-template-columns: 1fr 1fr;
  }

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

  .page-about .ab-audit {
    grid-template-columns: auto 1fr;
    align-items: center;
    gap: 8px 28px;
  }

  .page-about .ab-audit__label {
    grid-row: 1 / span 2;
    writing-mode: vertical-rl;
    letter-spacing: 0.3em;
  }

  .page-about .ab-audit__note {
    grid-column: 2;
  }

  .page-about .ab-awards {
    padding: 30px 30px 26px;
  }
}

@media (min-width: 1200px) {
  .page-about .ab-hero__title {
    max-width: 15ch;
  }

  .page-about .ab-tl__item {
    grid-template-columns: 156px 1fr;
  }
}
<<<END>>>

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