.page-about {
  background: var(--ink-900);
  color: var(--snow);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 28px 0 56px;
  background:
    radial-gradient(1100px 480px at 82% -12%, rgba(47, 127, 214, .24), transparent 70%),
    radial-gradient(880px 420px at 4% 8%, rgba(122, 31, 61, .3), transparent 72%),
    var(--ink-900);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-hero-grid {
  display: grid;
  gap: var(--gap);
  margin-top: 22px;
}

.page-about .about-kicker {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-size: var(--fs-12);
  letter-spacing: .18em;
  color: var(--gold);
}

.page-about .about-kicker-bar {
  display: inline-block;
  width: 46px;
  height: 3px;
  background: linear-gradient(90deg, var(--blue-500) 0 20%, var(--snow) 20% 40%, var(--red-500) 40% 60%, var(--green-500) 60% 80%, var(--yellow-400) 80% 100%);
}

.page-about .about-hero-copy h1 {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 7vw, 64px);
  line-height: 1.14;
  letter-spacing: -.01em;
  color: var(--snow);
}

.page-about .about-lead {
  margin: 0 0 28px;
  max-width: 34em;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-bottom: 28px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-fact {
  padding: 16px 14px;
  background: var(--ink-800);
}

.page-about .about-fact-num {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-28);
  font-weight: 700;
  line-height: 1;
  color: var(--yellow-400);
}

.page-about .about-unit {
  font-size: var(--fs-14);
  margin-left: 2px;
}

.page-about .about-fact-label {
  display: block;
  margin-top: 8px;
  font-size: var(--fs-12);
  line-height: 1.6;
  color: var(--mist);
}

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

.page-about .about-hero-fig {
  margin: 0;
  position: relative;
}

.page-about .about-hero-fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  border: 1px solid var(--line-mid);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 34px), calc(100% - 34px) 100%, 0 100%);
}

.page-about .about-hero-fig figcaption {
  margin-top: 10px;
  font-size: var(--fs-12);
  line-height: 1.6;
  color: var(--mist);
  border-left: 2px solid var(--wine-700);
  padding-left: 10px;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  position: relative;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-chapter--wine::before,
.page-about .about-chapter--teal::before,
.page-about .about-chapter--blue::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
}

.page-about .about-chapter--wine::before {
  background: linear-gradient(90deg, var(--wine-700), rgba(122, 31, 61, 0) 70%);
}

.page-about .about-chapter--teal::before {
  background: linear-gradient(90deg, var(--teal-900), rgba(14, 59, 58, 0) 70%);
}

.page-about .about-chapter--blue::before {
  background: linear-gradient(90deg, var(--blue-500), rgba(47, 127, 214, 0) 70%);
}

.page-about .chapter-row {
  display: grid;
  gap: 14px;
}

.page-about .chapter-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(48px, 11vw, 88px);
  line-height: .9;
  letter-spacing: -.03em;
}

.page-about .chapter-body h2,
.page-about .timeline-head h2 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 4vw, 40px);
  line-height: 1.22;
  color: var(--snow);
}

.page-about .chapter-body h2::after {
  content: "";
  display: block;
  width: 56px;
  height: 3px;
  margin-top: 16px;
  background: linear-gradient(90deg, var(--yellow-400) 0 34%, var(--red-500) 34% 66%, var(--blue-500) 66% 100%);
}

.page-about .chapter-lead {
  margin-top: 0;
}

.page-about .chapter-body .prose p {
  margin: 0 0 16px;
  font-size: var(--fs-16);
  line-height: 1.78;
  color: var(--mist);
  max-width: 68ch;
}

.page-about .chapter-body .prose p:last-child {
  margin-bottom: 0;
}

/* ---------- 团队 ---------- */
.page-about .team-lead {
  margin-bottom: 24px;
}

.page-about .team-roles {
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .role-card {
  padding: 18px 18px 20px;
  background: var(--ink-750);
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--line-mid);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .role-card:hover {
  transform: translateY(-2px);
  border-left-color: var(--gold);
}

.page-about .role-card p {
  margin: 12px 0 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--mist);
}

.page-about .team-fig {
  margin: 0;
}

.page-about .team-fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 20 / 13;
  object-fit: cover;
  border: 1px solid var(--line-soft);
}

.page-about .team-fig figcaption {
  margin-top: 10px;
  font-size: var(--fs-12);
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 覆盖与场景 ---------- */
.page-about .coverage-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0 28px;
}

.page-about .scene-grid {
  display: grid;
  gap: 16px;
}

.page-about .scene-card {
  position: relative;
  padding: 20px 18px 22px;
  background: var(--ink-800);
  border: 1px solid var(--line-soft);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .scene-card:hover {
  transform: translateY(-2px);
  border-color: var(--line-gold);
}

.page-about .scene-bar {
  display: block;
  width: 40px;
  height: 3px;
  margin-bottom: 14px;
}

.page-about .scene-bar--blue { background: var(--blue-500); }
.page-about .scene-bar--yellow { background: var(--yellow-400); }
.page-about .scene-bar--red { background: var(--red-500); }

.page-about .scene-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-20);
  line-height: 1.35;
  color: var(--snow);
}

.page-about .scene-card p {
  margin: 0;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--mist);
}

.page-about .scene-link {
  margin: 26px 0 0;
}

/* ---------- 视觉由来 ---------- */
.page-about .visual-grid {
  display: grid;
  gap: 22px;
}

.page-about .visual-swatches {
  display: flex;
  gap: 6px;
  align-items: stretch;
}

.page-about .sw {
  flex: 1;
  height: 68px;
  display: block;
}

.page-about .sw--blue { background: var(--blue-500); }
.page-about .sw--snow { background: var(--snow); }
.page-about .sw--red { background: var(--red-500); }
.page-about .sw--green { background: var(--green-500); }
.page-about .sw--yellow { background: var(--yellow-400); }

/* ---------- 时间线 ---------- */
.page-about .about-timeline-section {
  border-top: 1px solid var(--line-soft);
  background:
    linear-gradient(180deg, rgba(20, 40, 74, .9), rgba(10, 24, 48, 1) 72%),
    var(--ink-900);
}

.page-about .timeline-head {
  max-width: 44em;
  margin-bottom: 28px;
}

.page-about .timeline-head h2::after {
  content: "";
  display: block;
  width: 56px;
  height: 3px;
  margin-top: 16px;
  background: var(--wine-700);
}

.page-about .timeline-head p {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: var(--mist);
}

.page-about .timeline-wrap {
  position: relative;
  padding: 22px 0;
}

.page-about .tl-texture {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: .18;
  pointer-events: none;
}

.page-about .about-timeline {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .tl-item {
  position: relative;
  padding: 18px 16px 18px 22px;
  background: rgba(11, 30, 59, .86);
  border: 1px solid var(--line-soft);
  border-top: 2px solid var(--line-mid);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  outline: none;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .tl-item:hover,
.page-about .tl-item:focus-visible {
  border-top-color: var(--yellow-400);
  background: rgba(20, 40, 74, .95);
}

.page-about .tl-item:focus-visible {
  box-shadow: 0 0 0 2px var(--gold);
}

.page-about .tl-year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-20);
  font-weight: 700;
  color: var(--yellow-400);
  letter-spacing: .02em;
}

.page-about .tl-title {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-16);
  line-height: 1.4;
  color: var(--snow);
}

.page-about .tl-note {
  margin: 8px 0 0;
  font-size: var(--fs-14);
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 原则 ---------- */
.page-about .principles-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .principles-list li {
  position: relative;
  padding: 14px 16px 14px 34px;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--mist);
  background: rgba(10, 24, 48, .5);
  border-left: 2px solid var(--teal-900);
}

.page-about .principles-list li::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 22px;
  width: 8px;
  height: 8px;
  background: var(--yellow-400);
  transform: rotate(45deg);
}

.page-about .principles-list strong {
  color: var(--snow);
  font-weight: 700;
}

.page-about .about-cta--end {
  margin-top: 30px;
  padding-top: 26px;
  border-top: 1px solid var(--line-soft);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 34px 0 72px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, .7fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .about-fact {
    padding: 20px 16px;
  }

  .page-about .chapter-row {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .visual-grid {
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .visual-swatches {
    flex-direction: column;
    height: 100%;
  }

  .page-about .sw {
    height: auto;
    min-height: 56px;
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 10px;
  }

  .page-about .about-timeline::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 34px;
    height: 1px;
    background: linear-gradient(90deg, var(--wine-700), var(--blue-500) 45%, var(--yellow-400));
    opacity: .7;
  }

  .page-about .timeline-wrap {
    padding: 26px 0 8px;
  }
}

@media (min-width: 900px) and (hover: hover) {
  .page-about .tl-note {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height var(--dur) var(--ease), opacity var(--dur) var(--ease);
  }

  .page-about .tl-item:hover .tl-note,
  .page-about .tl-item:focus-within .tl-note,
  .page-about .tl-item:focus .tl-note {
    max-height: 180px;
    opacity: 1;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero-copy h1 {
    max-width: 15em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .role-card,
  .page-about .scene-card,
  .page-about .tl-item,
  .page-about .tl-note {
    transition: none;
  }

  .page-about .role-card:hover,
  .page-about .scene-card:hover {
    transform: none;
  }
}