.page-about {
  --about-hair: rgba(34, 211, 238, .26);
  --about-hair-gold: rgba(231, 184, 75, .34);
  --about-surface: #0B1220;
  background: var(--ink-900);
  color: var(--mist);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(28px, 5vw, 64px) 0 clamp(32px, 5vw, 60px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -15%;
  width: min(720px, 78vw);
  height: min(720px, 78vw);
  background: radial-gradient(circle at 50% 50%, rgba(34, 211, 238, .16), rgba(34, 211, 238, 0) 62%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  align-items: end;
}

.page-about .about-hero__kicker {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin: 20px 0 18px;
}

.page-about .about-hero__kicker-text {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--iron);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(36px, 6.2vw, 72px);
  line-height: 1.06;
  letter-spacing: -.02em;
  color: var(--mist);
}

.page-about .about-hero__title br {
  display: none;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 36em;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.85;
  color: var(--steel);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  overflow: hidden;
  background: var(--ink-800);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-hero__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 34px 18px 14px;
  background: linear-gradient(to top, rgba(7, 11, 20, .94), rgba(7, 11, 20, 0));
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--steel);
}

/* ---------- 三条定位 ---------- */
.page-about .about-pillars {
  padding: 0 0 clamp(40px, 6vw, 76px);
}

.page-about .about-pillars__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-pillar {
  background: var(--ink-800);
  padding: clamp(20px, 3vw, 30px);
}

.page-about .about-pillar::before {
  content: "";
  display: block;
  width: 42px;
  height: 3px;
  border-radius: 2px;
  background: var(--cyan);
  margin-bottom: 16px;
}

.page-about .about-pillar:nth-child(2)::before {
  background: var(--gold);
}

.page-about .about-pillar:nth-child(3)::before {
  background: var(--steel);
}

.page-about .about-pillar__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2vw, 22px);
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--mist);
}

.page-about .about-pillar__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--steel);
}

/* ---------- 章节通用 ---------- */
.page-about .section {
  position: relative;
  padding: clamp(44px, 7vw, 92px) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .section__index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--cyan);
  margin: 0 0 12px;
}

.page-about .section__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 3.6vw, 42px);
  line-height: 1.2;
  letter-spacing: -.015em;
  color: var(--mist);
  margin: 0 0 16px;
}

.page-about .section__lede {
  max-width: 42em;
  margin: 0;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: var(--steel);
}

/* ---------- 发展历程 ---------- */
.page-about .about-history__figure {
  margin: clamp(28px, 4vw, 44px) 0 clamp(32px, 5vw, 56px);
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  overflow: hidden;
  background: var(--ink-800);
}

.page-about .about-history__figure img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(18px, 2.6vw, 28px);
}

.page-about .timeline__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .timeline__year {
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.6vw, 32px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: .04em;
  color: var(--gold);
  padding-left: 14px;
  border-left: 2px solid var(--about-hair-gold);
}

.page-about .timeline__card {
  position: relative;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  padding: clamp(18px, 2.6vw, 28px);
  transition: border-color .25s ease, transform .25s ease, background .25s ease;
}

.page-about .timeline__card:hover {
  border-color: var(--about-hair);
  background: var(--ink-700);
  transform: translateY(-3px);
}

.page-about .timeline__tag {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 10px;
  border: 1px solid var(--about-hair);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--cyan-soft);
}

.page-about .timeline__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2vw, 21px);
  font-weight: 800;
  line-height: 1.35;
  color: var(--mist);
}

.page-about .timeline__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--steel);
}

/* ---------- 归档体系 ---------- */
.page-about .about-archive__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 40px);
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .collection-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .collection {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: clamp(16px, 2.2vw, 22px);
  background: var(--ink-800);
  transition: background .2s ease;
}

.page-about .collection:hover {
  background: var(--ink-700);
}

.page-about .collection__num {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--cyan);
  padding-top: 2px;
}

.page-about .collection__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  color: var(--mist);
}

.page-about .collection__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--steel);
}

.page-about .about-archive__side {
  display: grid;
  gap: clamp(18px, 2.6vw, 26px);
  align-content: start;
}

.page-about .legend-card,
.page-about .locate-card {
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  padding: clamp(20px, 2.8vw, 28px);
}

.page-about .legend-card__title,
.page-about .locate-card__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  color: var(--mist);
}

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

.page-about .legend__item {
  display: grid;
  grid-template-columns: 14px minmax(0, 1fr);
  gap: 12px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--steel);
}

.page-about .legend__chip {
  display: block;
  width: 14px;
  height: 14px;
  margin-top: 6px;
  border-radius: 4px;
}

.page-about .legend__item--cyan .legend__chip {
  background: var(--cyan);
}

.page-about .legend__item--gold .legend__chip {
  background: var(--gold);
}

.page-about .legend__item--steel .legend__chip {
  background: var(--steel);
}

.page-about .legend__body strong {
  color: var(--mist);
  font-weight: 700;
}

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

.page-about .locate {
  display: grid;
  gap: 4px;
  padding-left: 14px;
  border-left: 2px solid var(--line);
}

.page-about .locate__key {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--gold);
}

.page-about .locate__val {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--steel);
}

.page-about .locate-card__note {
  margin: 18px 0 0;
  padding-top: 16px;
  border-top: 1px dashed var(--line-soft);
  font-size: 14px;
  line-height: 1.75;
  color: var(--iron);
}

.page-about .locate-card__note a {
  color: var(--cyan-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .locate-card__note a:hover {
  color: var(--cyan);
}

/* ---------- 服务能力 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.6vw, 44px);
  margin-top: clamp(28px, 4vw, 44px);
  align-items: start;
}

.page-about .stat-strip {
  list-style: none;
  margin: 0 0 clamp(22px, 3vw, 32px);
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .stat {
  background: var(--ink-800);
  padding: clamp(18px, 2.4vw, 24px);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px;
}

.page-about .stat__num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 3.6vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -.01em;
}

.page-about .stat:nth-child(2) .stat__num {
  color: var(--gold);
}

.page-about .stat:nth-child(3) .stat__num {
  color: var(--mist);
}

.page-about .stat__unit {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--steel);
}

.page-about .stat__label {
  flex: 1 0 100%;
  font-size: 13.5px;
  letter-spacing: .04em;
  color: var(--iron);
}

.page-about .about-team__note {
  border-left: 2px solid var(--about-hair);
  padding-left: clamp(16px, 2.2vw, 24px);
}

.page-about .about-team__note-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2vw, 21px);
  font-weight: 800;
  line-height: 1.4;
  color: var(--mist);
}

.page-about .about-team__note-text {
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--steel);
}

.page-about .about-team__note-text:last-child {
  margin-bottom: 0;
}

.page-about .about-team__note-text a {
  color: var(--cyan-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-team__note-text a:hover {
  color: var(--cyan);
}

.page-about .about-team__figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-l);
  overflow: hidden;
  background: var(--ink-800);
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-team__caption {
  padding: 12px 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--iron);
  background: var(--ink-800);
  border-top: 1px solid var(--line-soft);
}

/* ---------- 生态与认可 ---------- */
.page-about .partner-grid {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2vw, 20px);
}

.page-about .partner-card {
  position: relative;
  padding: clamp(20px, 2.8vw, 28px);
  background: linear-gradient(160deg, var(--ink-800) 0%, var(--about-surface) 100%);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
  transition: border-color .25s ease;
}

.page-about .partner-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), rgba(34, 211, 238, 0));
}

.page-about .partner-card:hover {
  border-color: var(--about-hair);
}

.page-about .partner-card__num {
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
  letter-spacing: -.01em;
}

.page-about .partner-card__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  color: var(--mist);
}

.page-about .partner-card__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--steel);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  border-top: 1px solid var(--line-soft);
  padding: clamp(40px, 6vw, 76px) 0;
  background: radial-gradient(120% 140% at 12% 0%, rgba(34, 211, 238, .12), rgba(7, 11, 20, 0) 60%);
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
  align-items: center;
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(24px, 3.2vw, 36px);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -.015em;
  color: var(--mist);
}

.page-about .about-cta__lede {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--steel);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__title br {
    display: block;
  }

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

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

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

  .page-about .stat {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
    gap: clamp(36px, 4vw, 64px);
  }

  .page-about .about-archive__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: clamp(32px, 4vw, 56px);
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    justify-content: space-between;
  }

  .page-about .timeline__item {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: clamp(20px, 3vw, 40px);
    align-items: start;
  }

  .page-about .timeline__item:nth-child(even) .timeline__card {
    margin-left: clamp(0px, 3.4vw, 52px);
  }

  .page-about .timeline__year {
    padding-top: 6px;
  }
}

@media (min-width: 1120px) {
  .page-about .partner-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline__card,
  .page-about .partner-card,
  .page-about .collection {
    transition: none;
  }

  .page-about .timeline__card:hover {
    transform: none;
  }
}