.page-about {
  --about-rail: 168px;
  --about-gap: clamp(24px, 4vw, 56px);
  display: block;
  background: var(--c-bg);
  color: var(--c-cream);
}

.page-about .section {
  padding: clamp(56px, 8vw, 112px) 0;
}

.page-about .section--alt {
  background:
    linear-gradient(180deg, rgba(14, 42, 32, .92) 0%, rgba(6, 20, 15, .96) 100%);
  border-top: 2px solid var(--line-soft);
  border-bottom: 2px solid var(--line-soft);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .08em;
  color: var(--c-rock);
  margin-bottom: clamp(18px, 3vw, 28px);
}

.page-about .breadcrumbs__link {
  color: var(--c-rock);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .breadcrumbs__link:hover,
.page-about .breadcrumbs__link:focus-visible {
  color: var(--c-cyan);
  border-bottom-color: var(--c-cyan);
}

.page-about .breadcrumbs__sep {
  color: var(--c-pitch);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(40px, 7vw, 96px) 0 clamp(48px, 7vw, 104px);
  background:
    radial-gradient(120% 90% at 80% 4%, rgba(56, 245, 198, .14), transparent 58%),
    linear-gradient(158deg, var(--c-panel) 0%, var(--c-bg) 66%);
  border-bottom: 2px solid var(--line-soft);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -14%;
  bottom: -34%;
  width: min(660px, 82vw);
  aspect-ratio: 1.35;
  transform: rotate(-14deg);
  background: linear-gradient(135deg, rgba(255, 75, 43, .18), rgba(217, 107, 59, .02));
  border: 2px solid var(--line-hot);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--c-cyan);
}

.page-about .about-hero h1 {
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(2.1rem, 5.4vw, 4.2rem);
  line-height: 1.14;
  letter-spacing: -.01em;
  color: var(--c-cream);
  max-width: 16em;
}

.page-about .about-hero .lede {
  margin: 0 0 clamp(24px, 3vw, 34px);
  max-width: 46ch;
  font-size: clamp(1rem, 1.4vw, 1.125rem);
  line-height: 1.8;
  color: rgba(244, 241, 230, .82);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 2px;
  margin: 0 0 clamp(24px, 3vw, 34px);
  border: 2px solid var(--line-cyan);
  background: var(--line-cyan);
}

.page-about .about-hero__fact {
  background: var(--c-bg);
  padding: 14px 16px;
}

.page-about .about-hero__fact dt {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .12em;
  color: var(--c-rock);
  margin-bottom: 6px;
}

.page-about .about-hero__fact dd {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.15rem, 2vw, 1.5rem);
  letter-spacing: .01em;
  color: var(--c-cyan);
}

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

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

.page-about .figure__media {
  overflow: hidden;
  border: 2px solid var(--line-soft);
  border-radius: var(--radius-card);
  background: var(--c-panel);
  box-shadow: var(--shadow-deep);
}

.page-about .figure__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .figure__caption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: .74rem;
  line-height: 1.7;
  color: var(--c-rock);
}

/* ---------- 起点章节 ---------- */
.page-about .about-start__head {
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .about-start__grid {
  display: grid;
  gap: 2px;
  background: var(--line-soft);
  border: 2px solid var(--line-soft);
}

.page-about .about-start__card {
  background: var(--c-panel);
  border: 0;
  border-radius: 0;
  box-shadow: none;
  padding: clamp(22px, 3vw, 34px);
  transition: background .25s var(--ease);
}

.page-about .about-start__card:hover {
  background: #123328;
}

.page-about .about-start__card .tag {
  margin-bottom: 14px;
}

.page-about .about-start__card h3 {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--c-cream);
}

.page-about .about-start__card p {
  margin: 0;
  font-size: .98rem;
  line-height: 1.75;
  color: rgba(244, 241, 230, .74);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline__head {
  margin-bottom: clamp(28px, 4vw, 52px);
}

.page-about .about-timeline__grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-timeline__rail {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
}

.page-about .about-timeline__rail .chapter-nav__link {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .06em;
  color: var(--c-rock);
  text-decoration: none;
  padding: 8px 14px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-pill);
  white-space: nowrap;
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .about-timeline__rail .chapter-nav__link:hover,
.page-about .about-timeline__rail .chapter-nav__link:focus-visible {
  color: var(--c-cyan);
  border-color: var(--line-cyan);
}

.page-about .about-timeline__rail .chapter-nav__link.is-active {
  color: var(--c-ink);
  background: var(--c-cyan);
  border-color: var(--c-cyan);
}

.page-about .about-timeline__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 clamp(16px, 3vw, 30px);
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  bottom: 8px;
  width: 3px;
  background: linear-gradient(180deg, var(--c-cyan), var(--c-pitch) 55%, rgba(255, 75, 43, .7));
  border-radius: 2px;
}

.page-about .about-node {
  position: relative;
  display: grid;
  gap: 12px;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: calc(-1 * clamp(16px, 3vw, 30px) - 4px);
  top: 16px;
  width: 11px;
  height: 11px;
  background: var(--c-cyan);
  border: 2px solid var(--c-bg);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(56, 245, 198, .16);
}

.page-about .about-node--hot::before {
  background: var(--c-hot);
  box-shadow: 0 0 0 4px rgba(255, 75, 43, .18);
}

.page-about .about-node__year {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-node__num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.9rem, 4.6vw, 3rem);
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--c-cream);
}

.page-about .about-node__phase {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--c-rock);
}

.page-about .panel {
  background: var(--c-panel);
  border: 2px solid var(--line-soft);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
}

.page-about .about-node__card {
  padding: clamp(20px, 3vw, 30px);
  transition: border-color .25s var(--ease), transform .25s var(--ease);
}

.page-about .about-node__card:hover {
  border-color: var(--line-cyan);
  transform: translateY(-3px);
}

.page-about .about-node__card h3 {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: clamp(1.2rem, 2.2vw, 1.5rem);
  font-weight: 600;
  line-height: 1.4;
  color: var(--c-cream);
}

.page-about .about-node__card p {
  margin: 0 0 12px;
  font-size: .98rem;
  line-height: 1.78;
  color: rgba(244, 241, 230, .76);
}

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

.page-about .panel--hot {
  border-color: var(--line-hot);
  background: linear-gradient(150deg, rgba(255, 75, 43, .12), var(--c-panel) 62%);
}

.page-about .about-node__link {
  font-family: var(--font-mono);
  font-size: .82rem;
}

.page-about .about-node__meta {
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .meta-row {
  display: flex;
  gap: 8px;
}

.page-about .meta-row__item {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--c-rock);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-pill);
  padding: 4px 10px;
}

/* ---------- 数据校对 ---------- */
.page-about .about-proof__inner {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-proof__head {
  margin-bottom: clamp(22px, 3vw, 34px);
}

.page-about .about-proof__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
  background: var(--line-soft);
  border-left: 3px solid var(--c-teal);
}

.page-about .about-proof__item {
  background: var(--c-bg);
  padding: clamp(16px, 2.4vw, 22px) clamp(18px, 2.6vw, 26px);
}

.page-about .about-proof__item h3 {
  margin: 0 0 8px;
  font-family: var(--font-body);
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--c-cyan);
}

.page-about .about-proof__item p {
  margin: 0;
  font-size: .95rem;
  line-height: 1.75;
  color: rgba(244, 241, 230, .74);
}

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

/* ---------- 跟队服务 ---------- */
.page-about .about-follow__head {
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .about-follow__grid {
  display: grid;
  gap: var(--about-gap);
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .about-follow__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 2px;
  background: var(--line-cyan);
  border: 2px solid var(--line-cyan);
  align-self: start;
}

.page-about .about-stat {
  background: var(--c-panel);
  padding: clamp(16px, 2.4vw, 24px);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-stat__num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  line-height: .95;
  letter-spacing: -.01em;
  color: var(--c-cyan);
}

.page-about .about-stat__label {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  line-height: 1.5;
  color: var(--c-rock);
}

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

.page-about .about-follow__note {
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--c-bg);
}

.page-about .about-follow__note h3 {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-size: 1.16rem;
  font-weight: 600;
  line-height: 1.45;
  color: var(--c-cream);
}

.page-about .about-follow__note p {
  margin: 0;
  font-size: .96rem;
  line-height: 1.76;
  color: rgba(244, 241, 230, .76);
}

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

/* ---------- 团队 ---------- */
.page-about .about-team__head {
  margin-bottom: clamp(26px, 4vw, 44px);
}

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

.page-about .about-team__card {
  position: relative;
  padding: clamp(22px, 3vw, 32px);
  overflow: hidden;
}

.page-about .about-team__index {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.6rem, 7vw, 4.4rem);
  line-height: .9;
  color: rgba(56, 245, 198, .22);
  margin-bottom: 6px;
}

.page-about .about-team__card h3 {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: 1.22rem;
  font-weight: 600;
  color: var(--c-cream);
}

.page-about .about-team__card p {
  margin: 0;
  font-size: .96rem;
  line-height: 1.76;
  color: rgba(244, 241, 230, .74);
}

.page-about .about-team__card--wide {
  border-color: var(--line-cyan);
  background: linear-gradient(140deg, rgba(56, 245, 198, .08), var(--c-panel) 60%);
}

/* ---------- 运营理念 ---------- */
.page-about .about-principles {
  background:
    radial-gradient(90% 70% at 12% 10%, rgba(217, 107, 59, .16), transparent 62%),
    linear-gradient(180deg, var(--c-panel), var(--c-bg));
  border-top: 2px solid var(--line-soft);
}

.page-about .about-principles__head {
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .about-principles__grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-principles__col h3 {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .16em;
  color: var(--c-clay);
}

.page-about .about-principles__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-principles__list li {
  position: relative;
  padding-left: 20px;
  font-size: .98rem;
  line-height: 1.8;
  color: rgba(244, 241, 230, .78);
}

.page-about .about-principles__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 8px;
  height: 2px;
  background: var(--c-cyan);
}

.page-about .about-principles__list strong {
  color: var(--c-cream);
  font-weight: 600;
}

.page-about .about-principles__aside {
  border: 2px solid var(--line-hot);
  border-radius: var(--radius-card);
  background: rgba(255, 75, 43, .07);
  padding: clamp(22px, 3vw, 32px);
  box-shadow: var(--shadow-card);
  align-self: start;
}

.page-about .about-principles__aside-num {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(3.4rem, 9vw, 5.4rem);
  line-height: .85;
  color: var(--c-hot);
}

.page-about .about-principles__aside-text {
  margin: 12px 0 0;
  font-size: .95rem;
  line-height: 1.78;
  color: rgba(244, 241, 230, .8);
}

/* ---------- 下一步 ---------- */
.page-about .about-next__plate {
  border: 2px solid var(--line-cyan);
  border-radius: var(--radius-card);
  background: linear-gradient(150deg, var(--c-panel), var(--c-bg) 72%);
  box-shadow: var(--shadow-deep);
  padding: clamp(26px, 4vw, 52px);
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-next__lead h2 {
  margin: 8px 0 12px;
  font-family: var(--font-serif);
  font-size: clamp(1.7rem, 3.4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.24;
  color: var(--c-cream);
}

.page-about .about-next__lead p {
  margin: 0;
  max-width: 48ch;
  font-size: .98rem;
  line-height: 1.8;
  color: rgba(244, 241, 230, .76);
}

.page-about .about-next__links {
  display: grid;
  gap: 2px;
  background: var(--line-soft);
}

.page-about .about-next__link {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 14px;
  padding: 16px 18px;
  background: var(--c-bg);
  text-decoration: none;
  transition: background .22s var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background: #123328;
}

.page-about .about-next__link-index {
  grid-row: span 2;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.6rem;
  line-height: 1;
  color: var(--c-rock);
}

.page-about .about-next__link-title {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--c-cream);
}

.page-about .about-next__link-desc {
  font-family: var(--font-mono);
  font-size: .74rem;
  line-height: 1.6;
  color: var(--c-rock);
}

.page-about .about-next__link--hot .about-next__link-index {
  color: var(--c-hot);
}

.page-about .about-next__link--hot:hover,
.page-about .about-next__link--hot:focus-visible {
  background: rgba(255, 75, 43, .12);
}

/* ---------- 内链 ---------- */
.page-about .link {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(56, 245, 198, .4);
  transition: border-color .2s var(--ease), color .2s var(--ease);
}

.page-about .link:hover,
.page-about .link:focus-visible {
  color: var(--c-cream);
  border-bottom-color: var(--c-cream);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-start__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-team__card--wide {
    grid-column: span 2;
  }

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

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

  .page-about .about-next__link {
    grid-template-columns: 1fr;
  }

  .page-about .about-next__link-index {
    grid-row: auto;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-about .about-timeline__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-timeline__rail {
    position: sticky;
    top: 112px;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    overflow: visible;
    padding-bottom: 0;
    border-left: 2px solid var(--line-soft);
    padding-left: 14px;
  }

  .page-about .about-timeline__rail .chapter-nav__link {
    border: 0;
    border-radius: 0;
    padding: 6px 6px 6px 0;
    background: transparent;
  }

  .page-about .about-timeline__rail .chapter-nav__link.is-active {
    color: var(--c-cyan);
    background: transparent;
    box-shadow: inset 3px 0 0 var(--c-cyan);
    padding-left: 10px;
  }

  .page-about .about-node {
    grid-template-columns: 118px minmax(0, 1fr);
    align-items: start;
    gap: 20px;
  }

  .page-about .about-node__year {
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
    padding-top: 4px;
  }

  .page-about .about-node:nth-child(even) .about-node__card {
    margin-left: clamp(20px, 6%, 72px);
  }

  .page-about .about-proof__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
  }

  .page-about .about-proof__figure {
    position: sticky;
    top: 112px;
  }

  .page-about .about-follow__grid {
    grid-template-columns: minmax(220px, .62fr) minmax(0, 1.38fr);
    align-items: start;
  }

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

  .page-about .about-team__card--wide {
    grid-column: span 3;
  }

  .page-about .about-principles__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(260px, .72fr);
    align-items: start;
  }

  .page-about .about-next__plate {
    grid-template-columns: minmax(0, .9fr) minmax(0, 1.4fr);
    align-items: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node__card,
  .page-about .about-next__link,
  .page-about .about-start__card {
    transition: none;
  }

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