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

.page-about .mono {
  font-family: var(--font-mono);
  letter-spacing: .08em;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding-top: clamp(20px, 4vw, 40px);
  background:
    radial-gradient(120% 80% at 88% -10%, rgba(200, 255, 61, .12), transparent 62%),
    linear-gradient(180deg, var(--ink) 0%, var(--moss) 68%, var(--ink) 100%);
  overflow: hidden;
}

.page-about .ab-hero__glow {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, rgba(42, 56, 50, .55) 0 1px, transparent 1px 96px),
    repeating-linear-gradient(0deg, rgba(42, 56, 50, .38) 0 1px, transparent 1px 96px);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .7), transparent 78%);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .7), transparent 78%);
  opacity: .55;
}

.page-about .ab-hero__crumb {
  position: relative;
  z-index: 1;
  margin-bottom: clamp(20px, 4vw, 42px);
}

.page-about .ab-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(28px, 5vw, 56px);
  padding-bottom: clamp(32px, 5vw, 56px);
}

.page-about .ab-hero__lead {
  padding-right: clamp(0px, 3vw, 32px);
}

.page-about .ab-hero__idx {
  margin: 0 0 clamp(14px, 2.4vw, 24px);
  font-size: 11px;
  text-transform: uppercase;
  color: var(--lime);
}

.page-about .ab-hero__title {
  margin: 0 0 clamp(18px, 3vw, 30px);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(38px, 8.6vw, 112px);
  line-height: .94;
  letter-spacing: -.015em;
  transform: skewX(-6deg);
  transform-origin: left bottom;
  color: var(--paper);
}

.page-about .ab-hero__title em {
  font-style: normal;
  color: var(--lime);
}

.page-about .ab-hero__lede {
  max-width: 60ch;
  margin: 0 0 clamp(22px, 3.4vw, 34px);
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.9;
  color: var(--mist);
}

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

.page-about .ab-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  background: var(--hair);
  border: var(--line);
}

.page-about .ab-fact {
  padding: clamp(14px, 2.4vw, 22px);
  background: var(--moss);
}

.page-about .ab-fact dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--mist);
  margin-bottom: 10px;
}

.page-about .ab-fact dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.6vw, 36px);
  line-height: 1;
  color: var(--paper);
}

.page-about .ab-fact dd small {
  font-size: 11px;
  letter-spacing: .04em;
  color: var(--mist);
  margin-left: 4px;
}

.page-about .ab-hero__media {
  position: relative;
  z-index: 1;
  margin: 0;
  border-top: var(--line);
}

.page-about .ab-hero__media img {
  display: block;
  width: 100%;
  height: clamp(190px, 34vw, 420px);
  object-fit: cover;
  filter: saturate(.72) brightness(.78) contrast(1.06);
}

.page-about .ab-hero__media figcaption {
  padding: 12px var(--gutter) 18px;
  font-size: 11px;
  color: var(--mist);
  border-top: var(--line);
  background: var(--moss);
}

/* ---------- 章节通用 ---------- */
.page-about .ab-chapter {
  padding-block: clamp(52px, 9vw, 112px);
}

.page-about .ab-chapter--band {
  background: linear-gradient(180deg, var(--moss), var(--ink) 82%);
  border-block: var(--line);
}

.page-about .ab-chapter__head {
  max-width: 74ch;
  margin-bottom: clamp(30px, 5vw, 56px);
}

.page-about .ab-chapter__no {
  display: inline-block;
  margin: 0 0 12px;
  font-size: 12px;
  color: var(--lime);
  letter-spacing: .18em;
}

.page-about .ab-chapter__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 4.2vw, 50px);
  line-height: 1.12;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .ab-chapter__sub {
  margin: 0;
  font-size: clamp(14px, 1.7vw, 17px);
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 定位 ---------- */
.page-about .ab-position {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
}

.page-about .ab-position__body p {
  margin: 0 0 18px;
  max-width: 66ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.9;
  color: var(--paper);
  opacity: .9;
}

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

.page-about .ab-position__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--hair);
  border: var(--line);
}

.page-about .ab-layer {
  padding: clamp(18px, 3vw, 26px);
  background: var(--teal);
}

.page-about .ab-layer__no {
  display: inline-block;
  font-size: 11px;
  color: var(--glacier);
  letter-spacing: .2em;
  margin-bottom: 10px;
}

.page-about .ab-layer__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(17px, 2.2vw, 21px);
  font-weight: 700;
  color: var(--paper);
}

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

/* ---------- 时间线 ---------- */
.page-about .ab-timeline {
  display: grid;
  gap: clamp(20px, 3.6vw, 44px);
}

.page-about .ab-timeline__rail {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 10px;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-tl-tab {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 132px;
  padding: 12px 16px;
  text-align: left;
  background: transparent;
  border: var(--line);
  border-radius: 2px;
  color: var(--mist);
  font-family: var(--font-body);
  cursor: pointer;
  transition: background .2s var(--ease), border-color .2s var(--ease), color .2s var(--ease);
}

.page-about .ab-tl-tab:hover {
  border-color: var(--glacier);
  color: var(--paper);
}

.page-about .ab-tl-tab:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

.page-about .ab-tl-tab__year {
  font-size: 16px;
  letter-spacing: .06em;
  color: var(--paper);
}

.page-about .ab-tl-tab__name {
  font-size: 12px;
  line-height: 1.4;
}

.page-about .ab-tl-tab[aria-selected="true"] {
  background: var(--lime);
  border-color: var(--lime);
  color: #08110D;
}

.page-about .ab-tl-tab[aria-selected="true"] .ab-tl-tab__year,
.page-about .ab-tl-tab[aria-selected="true"] .ab-tl-tab__name {
  color: #08110D;
}

.page-about .ab-timeline__panels {
  display: grid;
  gap: 18px;
  padding: clamp(20px, 3.4vw, 34px);
  border: var(--line);
  background: rgba(12, 31, 25, .72);
  box-shadow: var(--shadow);
}

.page-about .ab-tl-panel__year {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: clamp(34px, 6vw, 62px);
  line-height: 1;
  color: var(--lime);
  letter-spacing: .02em;
}

.page-about .ab-tl-panel__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.6vw, 26px);
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-tl-panel p {
  margin: 0 0 16px;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .ab-tl-panel__meta {
  margin: 0;
  padding-top: 12px;
  border-top: var(--line);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--glacier);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  gap: 1px;
  background: var(--hair);
  border: var(--line);
}

.page-about .ab-team__card {
  padding: clamp(20px, 3.4vw, 30px);
  background: var(--moss);
}

.page-about .ab-team__no {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--amber);
}

.page-about .ab-team__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.4vw, 23px);
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-team__body {
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .ab-team__more {
  border-top: var(--line);
  padding-top: 12px;
}

.page-about .ab-team__more summary {
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--glacier);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

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

.page-about .ab-team__more summary::before {
  content: "+";
  display: inline-block;
  width: 14px;
  color: var(--lime);
  font-family: var(--font-mono);
}

.page-about .ab-team__more[open] summary::before {
  content: "−";
}

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

.page-about .ab-team__more p {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .ab-process {
  margin-top: clamp(28px, 4.4vw, 48px);
  padding: clamp(20px, 3.4vw, 32px);
  border: var(--line);
  border-left: 3px solid var(--lime);
  background: linear-gradient(90deg, rgba(18, 54, 44, .8), rgba(8, 17, 13, .2));
}

.page-about .ab-process__label {
  margin: 0 0 18px;
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--lime);
}

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

.page-about .ab-step {
  display: grid;
  gap: 4px;
}

.page-about .ab-step span {
  font-size: 11px;
  color: var(--glacier);
  letter-spacing: .16em;
}

.page-about .ab-step strong {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-step p {
  margin: 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 合作 ---------- */
.page-about .ab-net {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
}

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

.page-about .ab-node {
  position: relative;
  padding: clamp(16px, 2.8vw, 24px);
  border: var(--line);
  border-radius: 2px;
  background: var(--teal);
  transition: border-color .2s var(--ease), background .2s var(--ease), transform .2s var(--ease);
}

.page-about .ab-node:hover,
.page-about .ab-node:focus-within {
  border-color: var(--amber);
  background: #164034;
  transform: translateY(-2px);
}

.page-about .ab-node__type {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .1em;
  color: var(--amber);
  background: var(--amber-deep);
  border-radius: 2px;
}

.page-about .ab-node__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(16px, 2.1vw, 19px);
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-node p {
  margin: 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .ab-honor {
  padding: clamp(20px, 3.4vw, 30px);
  border: var(--line);
  background: rgba(8, 17, 13, .55);
}

.page-about .ab-honor__label {
  margin: 0 0 16px;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--lime);
}

.page-about .ab-honor__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--hair);
}

.page-about .ab-honor__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 12px;
  padding: 16px 0;
  background: transparent;
  border-bottom: var(--line);
}

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

.page-about .ab-honor__no {
  font-size: 12px;
  color: var(--glacier);
  letter-spacing: .1em;
  padding-top: 2px;
}

.page-about .ab-honor__item h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-honor__item p {
  margin: 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .ab-honor__foot {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: var(--line);
  font-size: 12px;
  line-height: 1.8;
  color: var(--glacier);
}

.page-about .ab-net__media {
  margin: clamp(28px, 4.4vw, 48px) 0 0;
  border: var(--line);
}

.page-about .ab-net__media img {
  display: block;
  width: 100%;
  height: clamp(170px, 30vw, 340px);
  object-fit: cover;
  filter: saturate(.66) brightness(.74) contrast(1.08);
}

.page-about .ab-net__media figcaption {
  padding: 12px 16px;
  font-size: 11px;
  color: var(--mist);
  border-top: var(--line);
  background: var(--moss);
}

/* ---------- 服务与联系 ---------- */
.page-about .ab-reach {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .ab-reach__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-reach__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--hair);
  border: var(--line);
}

.page-about .ab-reach__list li {
  padding: 16px 18px;
  background: var(--moss);
  display: grid;
  gap: 6px;
}

.page-about .ab-reach__list span {
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .ab-reach__list strong {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 400;
  color: var(--lime);
}

.page-about .ab-reach__list p {
  margin: 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .ab-reach__card {
  padding: clamp(20px, 3.4vw, 32px);
  border: var(--line);
  background: linear-gradient(180deg, var(--teal), rgba(12, 31, 25, .9));
}

.page-about .ab-reach__body {
  margin: 0 0 20px;
  font-size: 14px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .ab-reach__contact {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-reach__contact li {
  display: grid;
  gap: 4px;
  padding-bottom: 12px;
  border-bottom: var(--line);
}

.page-about .ab-reach__contact li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .ab-reach__contact span.mono {
  font-size: 10px;
  letter-spacing: .14em;
  color: var(--mist);
}

.page-about .ab-reach__contact a,
.page-about .ab-reach__contact li > span:not(.mono) {
  font-size: 14px;
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid rgba(111, 231, 200, .45);
  word-break: break-all;
}

.page-about .ab-reach__contact a:hover,
.page-about .ab-reach__contact a:focus-visible {
  color: var(--glacier);
  border-bottom-color: var(--glacier);
}

.page-about .ab-reach__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .ab-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .ab-process__steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 24px;
  }

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

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-about .ab-position {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-timeline {
    grid-template-columns: minmax(0, 236px) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-timeline__rail {
    flex-direction: column;
    overflow: visible;
    gap: 2px;
    padding: 0 0 0 18px;
    border-left: 1px solid var(--hair);
    position: relative;
  }

  .page-about .ab-tl-tab {
    min-width: 0;
    width: 100%;
    border: 0;
    border-left: 2px solid transparent;
    margin-left: -20px;
    padding: 14px 14px 14px 18px;
    border-radius: 0;
    position: relative;
  }

  .page-about .ab-tl-tab::before {
    content: "";
    position: absolute;
    left: 0;
    top: 22px;
    width: 8px;
    height: 8px;
    margin-left: -4px;
    border-radius: 50%;
    background: var(--hair);
    transition: background .2s var(--ease), box-shadow .2s var(--ease);
  }

  .page-about .ab-tl-tab[aria-selected="true"] {
    background: transparent;
    border-color: transparent;
    border-left-color: var(--lime);
  }

  .page-about .ab-tl-tab[aria-selected="true"] .ab-tl-tab__year {
    color: var(--lime);
  }

  .page-about .ab-tl-tab[aria-selected="true"] .ab-tl-tab__name {
    color: var(--paper);
  }

  .page-about .ab-tl-tab[aria-selected="true"]::before {
    background: var(--lime);
    box-shadow: 0 0 0 4px rgba(200, 255, 61, .18);
  }

  .page-about .ab-timeline__panels {
    min-height: 300px;
  }

  .page-about .ab-net {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-reach {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 1200px) {
  .page-about .ab-hero__media img {
    height: 460px;
  }

  .page-about .ab-hero__title {
    font-size: clamp(72px, 7.6vw, 118px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-node,
  .page-about .ab-tl-tab {
    transition: none;
  }

  .page-about .ab-node:hover,
  .page-about .ab-node:focus-within {
    transform: none;
  }
}