.page-about {
  background: var(--ivory);
  color: var(--char);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 18px 0 0;
  color: var(--on-ink-strong);
  background:
    radial-gradient(120% 90% at 86% -10%, rgba(212, 175, 55, 0.2), transparent 62%),
    linear-gradient(180deg, #0b1f3a 0%, #102a4c 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, rgba(212, 175, 55, 0.1) 0 1px, transparent 1px 88px),
    repeating-linear-gradient(0deg, rgba(212, 175, 55, 0.07) 0 1px, transparent 1px 88px);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 72%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.85), transparent 72%);
}

.page-about .about-hero .container {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb {
  margin: 0 0 24px;
}

.page-about .breadcrumb-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  font-size: 0.8125rem;
  color: rgba(246, 241, 230, 0.62);
}

.page-about .breadcrumb-list li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(212, 175, 55, 0.7);
}

.page-about .breadcrumb-list a {
  color: rgba(246, 241, 230, 0.8);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .breadcrumb-list a:hover,
.page-about .breadcrumb-list a:focus-visible {
  color: var(--gold-soft);
  border-bottom-color: var(--gold-soft);
}

.page-about .breadcrumb-list [aria-current="page"] {
  color: var(--gold-soft);
}

.page-about .hero-grid {
  display: grid;
  gap: 32px;
  padding-bottom: 40px;
}

.page-about .eyebrow {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
}

.page-about .hero-title {
  margin: 0 0 20px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(2rem, 7vw, 4rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: #f6f1e6;
  max-width: 16ch;
}

.page-about .hero-lede {
  margin: 0;
  max-width: 48ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--on-ink);
}

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

.page-about .about-hero .btn--ghost {
  color: var(--gold-soft);
  border-color: rgba(212, 175, 55, 0.5);
}

.page-about .about-hero .btn--ghost:hover,
.page-about .about-hero .btn--ghost:focus-visible {
  color: #f6f1e6;
  border-color: var(--gold);
  background: rgba(212, 175, 55, 0.12);
}

.page-about .hero-figure {
  margin: 0;
  border: 1px solid rgba(212, 175, 55, 0.34);
  background: rgba(11, 31, 58, 0.6);
}

.page-about .hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 6;
  object-fit: cover;
}

.page-about .hero-facts {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0;
  padding: 0;
  border-top: 1px solid rgba(212, 175, 55, 0.3);
}

.page-about .hero-facts li {
  padding: 18px 14px 22px 0;
  border-bottom: 1px solid rgba(212, 175, 55, 0.18);
}

.page-about .fx-num {
  display: block;
  font-size: clamp(1.6rem, 5vw, 2.5rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--gold);
}

.page-about .fx-label {
  display: block;
  margin-top: 6px;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: rgba(246, 241, 230, 0.66);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding: 52px 0;
  border-top: 1px solid var(--hairline);
}

.page-about .about-chapter--sand {
  background: var(--sand);
}

.page-about .chapter-rail {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 24px;
}

.page-about .chapter-num {
  font-size: 0.8125rem;
  letter-spacing: 0.16em;
  color: var(--gold);
  position: relative;
  padding-right: 42px;
}

.page-about .chapter-num::after {
  content: "";
  position: absolute;
  right: 0;
  top: 50%;
  width: 32px;
  height: 1px;
  background: var(--gold);
}

.page-about .chapter-title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.35rem, 4.5vw, 1.6rem);
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .lead-line {
  margin: 0 0 18px;
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .chapter-body p {
  margin: 0 0 16px;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--char);
}

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

.page-about .note-band {
  display: grid;
  grid-template-columns: 14px minmax(0, 1fr);
  gap: 16px;
  margin-top: 28px;
  padding: 20px 20px 20px 18px;
  background: linear-gradient(90deg, rgba(212, 175, 55, 0.16), rgba(212, 175, 55, 0));
  border-left: 2px solid var(--gold);
}

.page-about .note-band-mark {
  width: 10px;
  height: 10px;
  margin-top: 8px;
  background: var(--gold);
  transform: rotate(45deg);
}

.page-about .note-band p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--ink);
}

/* ---------- 时间线 ---------- */
.page-about .history-figure {
  margin: 0 0 36px;
  border: 1px solid var(--hairline);
  background: var(--ink);
}

.page-about .history-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .history-figure figcaption {
  padding: 10px 14px;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--gold-soft);
  border-top: 1px solid var(--hairline-dark);
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .tl-node {
  position: relative;
  padding: 0 0 30px 30px;
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 20px;
  bottom: -4px;
  width: 1px;
  background: var(--hairline);
}

.page-about .tl-node:last-child::before {
  display: none;
}

.page-about .tl-node::after {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  width: 13px;
  height: 13px;
  background: var(--ivory);
  border: 2px solid var(--gold);
  transform: rotate(45deg);
}

.page-about .about-chapter--sand .tl-node::after {
  background: var(--sand);
}

.page-about .tl-year {
  font-size: clamp(1.5rem, 5vw, 2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--gold);
  letter-spacing: -0.01em;
  margin-bottom: 10px;
}

.page-about .tl-card {
  background: var(--white);
  border: 1px solid var(--hairline);
  border-left: 3px solid rgba(11, 31, 58, 0.14);
  padding: 18px 18px 20px;
  transition: border-color 0.28s var(--ease), transform 0.28s var(--ease), box-shadow 0.28s var(--ease);
}

.page-about .tl-node:hover .tl-card,
.page-about .tl-node:focus-within .tl-card {
  border-left-color: var(--gold);
  transform: translateY(-3px);
  box-shadow: 0 10px 22px -18px rgba(11, 31, 58, 0.8);
}

.page-about .tl-title {
  margin: 10px 0 8px;
  font-family: var(--font-head);
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink);
}

.page-about .tl-card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--char);
}

/* ---------- 团队 ---------- */
.page-about .team-figure {
  margin: 0 0 28px;
  border: 1px solid rgba(11, 31, 58, 0.16);
  background: var(--ivory);
}

.page-about .team-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

.page-about .role-grid {
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 0 0 32px;
  padding: 0;
}

.page-about .role-card {
  position: relative;
  padding: 20px 18px 22px;
  background: var(--white);
  border: 1px solid rgba(11, 31, 58, 0.16);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

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

.page-about .role-card:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
}

.page-about .role-mark {
  position: absolute;
  top: 0;
  right: 0;
  width: 0;
  height: 0;
  border-top: 14px solid var(--gold);
  border-left: 14px solid transparent;
}

.page-about .role-num {
  display: block;
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
}

.page-about .role-name {
  margin: 8px 0 10px;
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
}

.page-about .role-card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--gray);
}

.page-about .check-flow {
  padding: 22px 18px;
  background: var(--ink);
  color: var(--on-ink);
}

.page-about .check-title {
  margin: 0 0 18px;
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 700;
  color: var(--gold-soft);
}

.page-about .check-list {
  list-style: none;
  display: grid;
  gap: 18px;
  margin: 0;
  padding: 0;
  counter-reset: step;
}

.page-about .check-list li {
  padding-top: 16px;
  border-top: 1px solid rgba(212, 175, 55, 0.24);
}

.page-about .check-list li:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .check-step {
  display: block;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--gold);
  margin-bottom: 6px;
}

.page-about .check-list strong {
  display: block;
  font-family: var(--font-head);
  font-size: 0.9375rem;
  color: #f6f1e6;
  margin-bottom: 6px;
}

.page-about .check-list p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--on-ink);
}

/* ---------- 板块地图 ---------- */
.page-about .map-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--hairline);
}

.page-about .map-list li {
  border-bottom: 1px solid var(--hairline);
}

.page-about .map-link {
  display: grid;
  gap: 8px;
  padding: 20px 6px 20px 14px;
  text-decoration: none;
  color: inherit;
  border-left: 2px solid transparent;
  transition: background 0.25s var(--ease), border-color 0.25s var(--ease), padding-left 0.25s var(--ease);
}

.page-about .map-link:hover,
.page-about .map-link:focus-visible {
  background: rgba(212, 175, 55, 0.1);
  border-left-color: var(--gold);
  padding-left: 20px;
}

.page-about .map-link:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
}

.page-about .map-title {
  display: block;
  font-family: var(--font-head);
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 6px;
}

.page-about .map-desc {
  display: block;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--gray);
}

.page-about .map-meta {
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--gold);
}

/* ---------- 联络 ---------- */
.page-about .about-contact {
  padding: 52px 0 60px;
  background:
    radial-gradient(110% 120% at 10% 0%, rgba(212, 175, 55, 0.16), transparent 58%),
    linear-gradient(180deg, #0b1f3a, #102a4c);
  color: var(--on-ink);
}

.page-about .contact-grid {
  display: grid;
  gap: 32px;
}

.page-about .contact-title {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.4rem, 4.6vw, 2rem);
  line-height: 1.35;
  color: #f6f1e6;
}

.page-about .contact-copy p {
  margin: 0 0 22px;
  max-width: 46ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--on-ink);
}

.page-about .contact-block {
  margin: 0;
  padding: 22px 20px;
  border: 1px solid rgba(212, 175, 55, 0.32);
  background: rgba(11, 31, 58, 0.55);
}

.page-about .contact-block .contact-row {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-top: 1px solid rgba(212, 175, 55, 0.18);
}

.page-about .contact-block .contact-row:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .contact-label {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-about .contact-value {
  margin: 0;
  font-size: 1rem;
  line-height: 1.6;
  color: #f6f1e6;
  word-break: break-word;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .hero-facts li {
    padding: 22px 18px 24px 0;
    border-bottom: 0;
  }

  .page-about .role-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .check-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .check-list li {
    border-top: 0;
    padding-top: 0;
    border-left: 1px solid rgba(212, 175, 55, 0.24);
    padding-left: 16px;
  }

  .page-about .check-list li:first-child {
    border-left: 0;
    padding-left: 0;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: 26px;
  }

  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: end;
    gap: 56px;
    padding-bottom: 52px;
  }

  .page-about .hero-title {
    font-size: clamp(2.6rem, 5.2vw, 4rem);
  }

  .page-about .hero-figure img {
    aspect-ratio: 4 / 3;
  }

  .page-about .about-chapter {
    padding: 84px 0;
  }

  .page-about .chapter-grid {
    display: grid;
    grid-template-columns: 210px minmax(0, 1fr);
    gap: 64px;
    align-items: start;
  }

  .page-about .chapter-rail {
    display: block;
    position: sticky;
    top: calc(var(--bar) + 32px);
    margin-bottom: 0;
  }

  .page-about .chapter-num {
    display: block;
    padding-right: 0;
    margin-bottom: 14px;
  }

  .page-about .chapter-num::after {
    display: none;
  }

  .page-about .chapter-title {
    font-size: clamp(1.5rem, 2.2vw, 1.9rem);
    padding-top: 18px;
    border-top: 1px solid var(--gold);
  }

  .page-about .lead-line {
    font-size: 1.125rem;
    max-width: 62ch;
  }

  .page-about .chapter-body p {
    max-width: 68ch;
  }

  .page-about .note-band {
    max-width: 68ch;
  }

  .page-about .tl-node {
    display: grid;
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 44px;
    padding: 0 0 44px 0;
  }

  .page-about .tl-node::before {
    left: 172px;
    top: 24px;
    bottom: 6px;
  }

  .page-about .tl-node::after {
    left: 166px;
    top: 16px;
  }

  .page-about .tl-year {
    margin-bottom: 0;
    text-align: right;
    padding-right: 2px;
    font-size: clamp(1.8rem, 3vw, 2.4rem);
  }

  .page-about .tl-card {
    padding: 22px 24px 24px;
  }

  .page-about .contact-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    gap: 72px;
    align-items: start;
  }

  .page-about .map-link {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 24px;
    padding: 22px 10px 22px 18px;
  }

  .page-about .map-link:hover,
  .page-about .map-link:focus-visible {
    padding-left: 26px;
  }

  .page-about .map-meta {
    text-align: right;
  }
}

@media (min-width: 1100px) {
  .page-about .about-chapter {
    padding: 96px 0;
  }

  .page-about .chapter-grid {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: 80px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-card,
  .page-about .role-card,
  .page-about .map-link,
  .page-about .breadcrumb-list a {
    transition: none;
  }

  .page-about .tl-node:hover .tl-card,
  .page-about .role-card:hover,
  .page-about .map-link:hover {
    transform: none;
  }
}