.page-about {
  display: block;
  position: relative;
  color: var(--glass);
  background:
    radial-gradient(1200px 560px at 6% -6%, rgba(20, 214, 196, .12), transparent 62%),
    radial-gradient(940px 520px at 98% 4%, rgba(255, 107, 74, .09), transparent 64%),
    var(--abyss);
  overflow-x: clip;
}

.page-about .breadcrumbs {
  padding-top: 20px;
}

.page-about .section-head {
  border-bottom: 1px solid var(--line);
  padding-bottom: 18px;
  margin-bottom: 34px;
}

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

.page-about .prose p {
  color: var(--scale);
}

/* ---------- 首屏 ---------- */
.about-hero {
  position: relative;
  padding: 26px 0 0;
}

.about-hero__grid {
  display: grid;
  gap: 30px;
}

.about-hero__title {
  margin: 12px 0 18px;
  font-size: clamp(34px, 7vw, 58px);
  line-height: 1.1;
  letter-spacing: -.015em;
}

.about-hero__lead {
  margin: 0;
  max-width: 48ch;
  color: var(--scale);
  font-size: 17px;
  line-height: 1.9;
}

.about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 26px;
}

.about-hero__quote {
  position: relative;
  margin: 0;
  padding: 20px 20px 20px 24px;
  background: var(--panel-soft);
  border: 1px solid var(--line);
  border-left: 3px solid var(--coral);
  box-shadow: var(--shadow-hard);
}

.about-hero__quote .h-serif {
  margin: 0;
  font-size: 18px;
  line-height: 1.8;
  color: var(--glass);
}

.about-banner {
  margin: 42px 0 0;
}

.about-banner img {
  display: block;
  width: 100%;
  height: clamp(220px, 40vw, 460px);
  object-fit: cover;
  object-position: center 72%;
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line-strong);
}

/* ---------- 章节刻度导航 ---------- */
.chapter-nav {
  margin-top: -1px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background-color: rgba(10, 36, 56, .55);
  background-image: repeating-linear-gradient(115deg, rgba(199, 214, 224, .05) 0 2px, transparent 2px 12px);
}

.chapter-nav__inner {
  display: flex;
  gap: 22px;
  overflow-x: auto;
  padding: 12px 0;
  -webkit-overflow-scrolling: touch;
}

.chapter-nav__link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  white-space: nowrap;
  padding: 6px 2px;
  border-bottom: 2px solid transparent;
  color: var(--mist);
  font-size: 14px;
  letter-spacing: .02em;
  text-decoration: none;
  transition: color .2s ease, border-color .2s ease;
}

.chapter-nav__link:hover,
.chapter-nav__link:focus-visible {
  color: var(--teal-bright);
  border-bottom-color: var(--coral);
}

.chapter-nav__tick {
  display: inline-block;
  width: 2px;
  height: 16px;
  background: var(--scale);
  opacity: .55;
}

/* ---------- 章节 ---------- */
.about-section {
  position: relative;
  padding: clamp(56px, 9vw, 104px) 0 0;
}

.page-about .editorial {
  display: grid;
  gap: 26px;
  align-items: start;
}

.rail-note {
  border-left: 2px solid var(--teal);
  padding: 4px 0 4px 16px;
}

.rail-note .display-num {
  margin: 6px 0 4px;
  color: var(--gold);
  font-size: 34px;
}

.rail-note__text {
  margin: 0;
  color: var(--scale);
  font-size: 15px;
  line-height: 1.75;
}

/* ---------- 团队 ---------- */
.about-team {
  display: grid;
  gap: 28px;
}

.about-team__figure {
  margin: 0;
  border: 1px solid var(--line-strong);
  background: var(--river-deep);
  box-shadow: var(--shadow-hard);
}

.about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  object-position: center 58%;
}

.team-bars {
  display: grid;
  gap: 20px;
  margin-top: 42px;
}

.team-bar__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.team-bar__label {
  color: var(--glass);
  font-size: 15px;
  letter-spacing: .04em;
}

.team-bar__num {
  margin: 0;
  color: var(--gold);
  font-size: 26px;
}

.team-bar__track {
  margin-top: 8px;
  height: 10px;
  border: 1px solid var(--line);
  background: rgba(199, 214, 224, .10);
}

.team-bar__fill {
  display: block;
  height: 100%;
  width: var(--bar-w);
  background: linear-gradient(90deg, var(--teal), var(--teal-bright));
  box-shadow: 0 0 12px rgba(20, 214, 196, .35);
  transition: width .9s cubic-bezier(.2, .7, .2, 1);
}

.page-about [data-reveal].is-armed .team-bar__fill {
  width: 0;
}

.page-about [data-reveal].is-in .team-bar__fill {
  width: var(--bar-w);
}

/* ---------- 时间线 ---------- */
.about-ridge {
  margin: 0 0 38px;
  border: 1px solid var(--line);
  background: var(--river-deep);
}

.about-ridge img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  object-position: center 50%;
}

.timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 4px 0 4px 34px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--teal), rgba(20, 214, 196, .08));
}

.tl-item {
  position: relative;
  margin: 0 0 20px;
}

.tl-item:last-child {
  margin-bottom: 0;
}

.tl-item::before {
  content: "";
  position: absolute;
  left: -33px;
  top: 22px;
  width: 20px;
  height: 12px;
  border-radius: 50%;
  background: var(--abyss);
  border: 2px solid var(--teal);
  box-shadow: 0 0 0 4px rgba(20, 214, 196, .12);
}

.tl-card {
  background: var(--panel-soft);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-hard);
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}

.tl-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lift);
  border-color: var(--line-strong);
}

.tl-card[open] {
  border-color: rgba(20, 214, 196, .45);
}

.tl-card__summary {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

.tl-card__summary::-webkit-details-marker {
  display: none;
}

.tl-card__summary:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
}

.tl-card__stage {
  font-family: var(--font-narrow);
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--teal);
}

.tl-card__title {
  margin: 0;
  color: var(--glass);
  font-size: 18px;
  line-height: 1.5;
}

.tl-card__text {
  margin: 0;
  padding: 0 18px 18px;
  color: var(--scale);
  font-size: 15px;
  line-height: 1.85;
}

/* ---------- 量级面板 ---------- */
.about-scale {
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow-hard);
}

.about-scale .panel__head {
  padding: 18px 20px;
  border-bottom: 1px solid var(--line);
}

.about-scale .panel__head h3 {
  margin: 0;
}

.page-about .panel__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
}

.page-about .stat {
  padding: 22px 18px;
  background: rgba(7, 27, 44, .75);
}

.page-about .stat__value {
  margin: 0;
  color: var(--gold);
  font-size: clamp(30px, 5vw, 40px);
}

.page-about .stat__label {
  margin: 8px 0 0;
  color: var(--mist);
  font-size: 14px;
  line-height: 1.65;
}

/* ---------- 资质标签 ---------- */
.page-about .chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  margin: 0 0 34px;
  padding: 0;
}

.cred-chips__item {
  margin: 0;
}

.page-about .chip {
  display: inline-flex;
  align-items: center;
  padding: 9px 15px;
  border: 1px solid var(--scale);
  background: var(--panel-soft);
  color: var(--glass);
  font-size: 14px;
  letter-spacing: .02em;
  transition: border-color .2s ease, color .2s ease, background-color .2s ease;
}

.page-about .chip:hover {
  border-color: var(--coral);
  color: var(--coral-glow);
  background: rgba(255, 107, 74, .10);
}

/* ---------- 值守节奏 ---------- */
.rhythm-grid {
  display: grid;
  gap: 20px;
}

.rhythm-card {
  padding: 22px;
  background: var(--panel-soft);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-hard);
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}

.rhythm-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lift);
  border-color: var(--line-strong);
}

.rhythm-card .card__title {
  margin: 12px 0 8px;
  color: var(--glass);
}

.rhythm-card .card__body {
  margin: 0;
  color: var(--scale);
  font-size: 15px;
  line-height: 1.85;
}

/* ---------- 收尾 ---------- */
.about-cta {
  margin-top: clamp(64px, 10vw, 120px);
  padding: clamp(36px, 6vw, 64px) 0;
  border-top: 1px solid var(--line-strong);
  background:
    linear-gradient(100deg, rgba(20, 214, 196, .10), rgba(255, 107, 74, .08) 62%, transparent),
    var(--river-deep);
}

.about-cta__inner {
  display: grid;
  gap: 26px;
}

.about-cta__lead {
  margin: 12px 0 0;
  max-width: 54ch;
  color: var(--scale);
  font-size: 16px;
  line-height: 1.9;
}

.about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
}

/* ---------- 显现动效 ---------- */
.page-about [data-reveal] {
  transition: opacity .5s ease, transform .5s ease;
}

.page-about [data-reveal].is-armed {
  opacity: 0;
  transform: translateY(14px);
}

.page-about [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ---------- 断点 ---------- */
@media (min-width: 768px) {
  .page-about .panel__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .team-bars {
    gap: 24px;
  }
}

@media (min-width: 900px) {
  .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: end;
  }

  .about-hero__quote {
    margin-bottom: 26px;
  }

  .page-about .editorial {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 48px;
  }

  .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 48px;
    align-items: center;
  }

  .timeline {
    padding-left: 0;
  }

  .timeline::before {
    left: 50%;
    transform: translateX(-1px);
  }

  .tl-item {
    width: calc(50% - 40px);
  }

  .tl-item:nth-child(even) {
    margin-left: calc(50% + 40px);
  }

  .tl-item:nth-child(odd)::before {
    left: calc(100% + 30px);
  }

  .tl-item:nth-child(even)::before {
    left: -50px;
  }

  .about-cta__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
    gap: 48px;
  }

  .about-cta__links {
    justify-content: flex-end;
  }
}

@media (max-width: 500px) {
  .chapter-nav__inner {
    gap: 16px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal],
  .team-bar__fill,
  .tl-card,
  .rhythm-card {
    transition: opacity .2s linear;
  }

  .page-about [data-reveal].is-armed {
    transform: none;
  }

  .tl-card:hover,
  .rhythm-card:hover {
    transform: none;
  }
}
</main>

.page-about {
  --bar-w: 1rem;
}