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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 104px 0 0;
  background:
    radial-gradient(90% 70% at 88% 4%, rgba(91, 63, 214, 0.55), transparent 62%),
    radial-gradient(70% 60% at 8% 100%, rgba(24, 52, 95, 0.95), transparent 72%),
    linear-gradient(180deg, #0b1b3a 0%, #071229 100%);
  color: var(--paper);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(201, 210, 227, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(201, 210, 227, 0.07) 1px, transparent 1px);
  background-size: 72px 72px;
  -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__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 40px;
  padding-bottom: 64px;
}

.page-about .about-hero .breadcrumbs__link,
.page-about .about-hero .breadcrumbs__current {
  color: var(--silver);
}

.page-about .about-hero .breadcrumbs__link:hover {
  color: var(--signal);
}

.page-about .about-hero__tag {
  margin-top: 26px;
  color: var(--signal);
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  font-size: clamp(2.6rem, 8vw, 4.6rem);
  font-weight: 200;
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__title strong {
  font-weight: 700;
  color: #ffffff;
}

.page-about .about-hero__lede {
  margin: 24px 0 0;
  max-width: 32em;
  font-size: clamp(1rem, 1.6vw, 1.125rem);
  line-height: 1.85;
  color: var(--silver);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
  background: rgba(201, 210, 227, 0.18);
  border: 1px solid rgba(201, 210, 227, 0.18);
}

.page-about .about-hero__fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 14px 16px;
  background: rgba(11, 27, 58, 0.78);
}

.page-about .about-hero__fact-key {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--silver);
}

.page-about .about-hero__fact-val {
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--paper);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 20px;
  margin-top: 32px;
}

.page-about .about-hero__jump {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--silver);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 210, 227, 0.4);
  padding-bottom: 3px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-hero__jump:hover {
  color: var(--signal);
  border-color: var(--signal);
}

.page-about .about-hero__figure {
  margin: 0;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border: 1px solid rgba(201, 210, 227, 0.22);
  background: linear-gradient(140deg, rgba(91, 63, 214, 0.6), rgba(11, 27, 58, 0.9));
}

.page-about .about-hero__figure figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--silver);
}

/* ---------- 章节导览 ---------- */
.page-about .about-index {
  padding: 28px 0;
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

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

.page-about .chapter-index__link {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 16px;
  background: var(--paper);
  color: var(--ink);
  text-decoration: none;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .chapter-index__num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--signal);
}

.page-about .chapter-index__label {
  font-size: 0.9375rem;
}

.page-about .chapter-index__link:hover,
.page-about .chapter-index__link:focus-visible {
  background: var(--deep-space);
  color: var(--paper);
}

/* ---------- 章节基座 ---------- */
.page-about .about-section {
  padding: 64px 0;
}

.page-about .about-section + .about-section {
  border-top: 1px solid var(--line);
}

.page-about .chapter-head {
  max-width: 44rem;
}

.page-about .chapter-head__title {
  margin: 14px 0 0;
  font-size: clamp(1.75rem, 3.6vw, 2.5rem);
  font-weight: 300;
  line-height: 1.18;
  letter-spacing: -0.01em;
}

.page-about .chapter-head__lede {
  margin: 16px 0 0;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 01 起点 ---------- */
.page-about .story-grid {
  display: grid;
  gap: 36px;
  margin-top: 36px;
}

.page-about .story-copy p {
  margin: 0 0 18px;
  line-height: 1.85;
}

.page-about .story-copy p:last-child {
  margin-bottom: 0;
}

.page-about .story-notes {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .story-note {
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: 14px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .story-note__num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--signal);
  padding-top: 0.35em;
}

.page-about .story-note__title {
  margin: 0 0 6px;
  font-size: 1rem;
  font-weight: 600;
}

.page-about .story-note__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 02 里程碑 ---------- */
.page-about .about-section--milestones {
  background: linear-gradient(180deg, rgba(94, 122, 101, 0.12), rgba(246, 241, 231, 0) 78%);
}

.page-about .about-band {
  margin: 36px 0 0;
}

.page-about .about-band img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border: 1px solid var(--line);
  background: linear-gradient(120deg, rgba(94, 122, 101, 0.35), rgba(11, 27, 58, 0.85));
}

.page-about .about-band figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .timeline {
  position: relative;
  display: grid;
  gap: 30px;
  margin: 32px 0 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--nebula), rgba(91, 63, 214, 0.16));
}

.page-about .timeline__item {
  position: relative;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 4px rgba(255, 122, 69, 0.16);
}

.page-about .timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--deep-space);
}

.page-about .timeline__stage {
  margin: 6px 0 0;
  font-size: 1rem;
  font-weight: 600;
}

.page-about .timeline__text {
  margin: 8px 0 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .timeline__item--moss .timeline__year {
  color: var(--moss);
}

.page-about .timeline__item--clay .timeline__year {
  color: var(--clay);
}

/* ---------- 03 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 36px;
  margin-top: 36px;
}

.page-about .team-lede {
  margin: 0;
  line-height: 1.85;
}

.page-about .role-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 28px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .role-card {
  padding: 20px 18px;
  background: var(--paper);
}

.page-about .role-card__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 500;
  line-height: 1;
  color: var(--nebula);
}

.page-about .role-card__unit {
  margin-left: 4px;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  color: var(--muted);
}

.page-about .role-card__name {
  margin: 12px 0 0;
  font-size: 1rem;
  font-weight: 600;
}

.page-about .role-card__text {
  margin: 8px 0 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .topic-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .topic-list li {
  padding: 6px 12px;
  font-size: 0.8125rem;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: var(--radius-sharp);
}

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

.page-about .team-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(91, 63, 214, 0.35), rgba(11, 27, 58, 0.85));
}

.page-about .team-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--muted);
}

/* ---------- 04 伙伴 ---------- */
.page-about .partner-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: 36px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .partner-cell {
  padding: 28px 24px;
  background: var(--paper);
}

.page-about .partner-cell__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 2.75rem;
  font-weight: 500;
  line-height: 1;
  color: var(--clay);
}

.page-about .partner-cell__label {
  display: block;
  margin-top: 8px;
  font-size: 1rem;
  font-weight: 600;
}

.page-about .partner-cell__text {
  margin: 12px 0 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .award-title {
  margin: 42px 0 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .award-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .award {
  padding: 4px 0 4px 16px;
  border-left: 2px solid var(--clay);
}

.page-about .award__year {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .award__name {
  display: block;
  margin-top: 6px;
  font-size: 1.0625rem;
  font-weight: 600;
}

.page-about .award__text {
  margin: 6px 0 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 05 覆盖与联系 ---------- */
.page-about .about-section--reach {
  background:
    radial-gradient(80% 90% at 92% 0%, rgba(91, 63, 214, 0.4), transparent 62%),
    linear-gradient(180deg, #0b1b3a 0%, #071229 100%);
  color: var(--paper);
  border-top: none;
}

.page-about .chapter-head--night .chapter-head__title {
  color: var(--paper);
}

.page-about .chapter-head--night .chapter-head__lede {
  color: var(--silver);
}

.page-about .index-tag--night {
  color: var(--signal);
}

.page-about .reach-grid {
  display: grid;
  gap: 40px;
  margin-top: 36px;
}

.page-about .reach-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(201, 210, 227, 0.2);
  border: 1px solid rgba(201, 210, 227, 0.2);
}

.page-about .reach-stat {
  padding: 22px 18px;
  background: rgba(11, 27, 58, 0.9);
}

.page-about .reach-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 2.25rem;
  font-weight: 500;
  line-height: 1;
  color: var(--signal);
}

.page-about .reach-stat__unit {
  margin-left: 4px;
  font-size: 0.875rem;
  color: var(--silver);
}

.page-about .reach-stat__label {
  display: block;
  margin-top: 10px;
  font-size: 0.875rem;
  color: var(--silver);
}

.page-about .reach-text {
  margin: 24px 0 0;
  max-width: 34em;
  line-height: 1.85;
  color: var(--silver);
}

.page-about .reach-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 22px;
  margin-top: 28px;
}

.page-about .reach-link {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 210, 227, 0.4);
  padding-bottom: 3px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .reach-link:hover {
  color: var(--signal);
  border-color: var(--signal);
}

.page-about .contact-list {
  margin: 0;
  padding: 0;
  border-top: 1px solid rgba(201, 210, 227, 0.2);
}

.page-about .contact-row {
  display: grid;
  grid-template-columns: 5rem 1fr;
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid rgba(201, 210, 227, 0.2);
}

.page-about .contact-row dt {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--silver);
  padding-top: 0.3em;
}

.page-about .contact-row dd {
  margin: 0;
  line-height: 1.7;
  color: var(--paper);
  overflow-wrap: anywhere;
}

.page-about .contact-note {
  margin: 20px 0 0;
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--silver);
}

/* ---------- 断点 ---------- */
@media (min-width: 560px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-hero__fact {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

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

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

@media (min-width: 720px) {
  .page-about .chapter-index {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .chapter-index__link {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 18px 14px;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: 140px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: end;
    padding-bottom: 88px;
  }

  .page-about .about-hero__figure img {
    aspect-ratio: 1 / 1;
  }

  .page-about .about-section {
    padding: 96px 0;
  }

  .page-about .story-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .reach-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .timeline {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 22px;
    padding: 38px 0 0;
  }

  .page-about .timeline::before {
    left: 0;
    right: 0;
    top: 10px;
    bottom: auto;
    width: auto;
    height: 1px;
    background: linear-gradient(90deg, var(--nebula), rgba(91, 63, 214, 0.18));
  }

  .page-about .timeline__item::before {
    left: 0;
    top: -32px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__title {
    font-size: 4.6rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .chapter-index__link,
  .page-about .about-hero__jump,
  .page-about .reach-link {
    transition: none;
  }
}