.page-about {
  --about-rail-gap: 0px;
  --about-card-border: rgba(40, 70, 107, 0.45);
  --about-soft-line: rgba(40, 70, 107, 0.22);
  --about-shadow: 0 18px 40px rgba(11, 31, 51, 0.08);
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background: var(--sea);
  color: var(--cream);
  padding: 40px 0 0;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(115deg, rgba(79, 209, 165, 0.09) 0%, transparent 42%),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.04) 0 1px, transparent 1px 88px);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  padding-bottom: 56px;
}

.page-about .about-hero .eyebrow {
  color: var(--orange);
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-size: clamp(28px, 6.4vw, 56px);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: 0.03em;
  color: #fff;
}

.page-about .about-hero h1 em {
  font-style: normal;
  color: var(--mint);
  display: inline-block;
  border-bottom: 4px solid var(--orange);
  padding-bottom: 2px;
}

.page-about .about-hero .lead {
  margin: 20px 0 0;
  max-width: 34em;
  color: rgba(244, 239, 230, 0.86);
  font-size: clamp(16px, 2vw, 19px);
  line-height: 1.85;
}

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

.page-about .hero-facts__item {
  background: var(--ink-blue);
  padding: 14px 16px;
}

.page-about .hero-facts dt {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--soft);
}

.page-about .hero-facts dd {
  margin: 6px 0 0;
  font-size: 24px;
  font-weight: 700;
  color: #fff;
}

.page-about .hero-facts dd .mono {
  font-size: 28px;
  color: var(--orange);
}

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

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-blue);
  transform: rotate(-0.6deg);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 8 / 5;
  object-fit: cover;
  opacity: 0.92;
}

.page-about .about-hero__caption {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px;
  padding: 12px 14px;
  font-size: 12px;
  color: var(--soft);
  border-top: 1px solid var(--line);
}

.page-about .about-hero__caption .mono {
  color: var(--orange);
  letter-spacing: 0.08em;
}

.page-about .about-hero .slash-divider {
  position: relative;
  z-index: 1;
  background: var(--sea);
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  position: sticky;
  top: var(--bar-h);
  z-index: 6;
  background: var(--cream);
  border-bottom: 1px solid var(--about-soft-line);
}

.page-about .about-index__list {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 10px 0;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index__item {
  flex: 0 0 auto;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  font-size: 13px;
  color: var(--graphite);
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: var(--radius);
  white-space: nowrap;
}

.page-about .about-index__num {
  font-size: 12px;
  color: var(--steel);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  border-color: var(--orange);
  color: var(--ink);
}

.page-about .about-index__link[aria-current="true"] {
  background: var(--sea);
  border-color: var(--sea);
  color: #fff;
}

.page-about .about-index__link[aria-current="true"] .about-index__num {
  color: var(--mint);
}

/* ---------- 通用章节调整 ---------- */
.page-about .section__title {
  margin: 10px 0 0;
  font-size: clamp(24px, 4vw, 38px);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.page-about .section__lead {
  margin: 14px 0 0;
  max-width: 38em;
  color: var(--graphite);
  font-size: 16px;
  line-height: 1.85;
}

.page-about .prose p {
  margin: 0 0 18px;
  max-width: 38em;
  color: var(--ink);
  font-size: 16px;
  line-height: 1.85;
}

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

/* ---------- 我们是谁 ---------- */
.page-about .about-who {
  background: var(--cream);
}

.page-about .about-who__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about .about-who__head .eyebrow {
  color: var(--orange-deep);
}

.page-about .about-who__body {
  border-left: 3px solid var(--orange);
  padding-left: 18px;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  background: var(--paper);
  border-top: 1px solid var(--about-soft-line);
  border-bottom: 1px solid var(--about-soft-line);
}

.page-about .timeline {
  position: relative;
  margin: 40px 0 0;
  padding: 0 0 0 18px;
  list-style: none;
  border-left: 2px solid var(--about-card-border);
}

.page-about .timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  padding-bottom: 34px;
}

.page-about .timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--mint);
}

.page-about .timeline__item--current::before {
  background: var(--amber);
  border-color: var(--amber);
  box-shadow: 0 0 0 4px rgba(242, 183, 5, 0.22);
}

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

.page-about .timeline__ver {
  font-size: 18px;
  font-weight: 500;
  color: var(--orange-deep);
  letter-spacing: 0.04em;
}

.page-about .timeline__item--current .timeline__ver {
  color: var(--sea);
}

.page-about .timeline__stage {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--graphite);
}

.page-about .timeline__card {
  position: relative;
  overflow: hidden;
  background: var(--paper);
  border: 1px solid var(--about-card-border);
  border-radius: var(--radius);
  padding: 22px 20px;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.page-about .timeline__card:hover {
  border-color: var(--orange);
  box-shadow: var(--about-shadow);
}

.page-about .timeline__item--current .timeline__card {
  background: var(--sea);
  border-color: var(--orange);
  color: var(--cream);
}

.page-about .timeline__ghost {
  position: absolute;
  right: 6px;
  bottom: -14px;
  font-size: 82px;
  line-height: 1;
  color: var(--sea);
  opacity: 0.08;
  pointer-events: none;
}

.page-about .timeline__item--current .timeline__ghost {
  color: var(--cream);
  opacity: 0.12;
}

.page-about .timeline__title {
  position: relative;
  margin: 0;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .timeline__item--current .timeline__title {
  color: #fff;
}

.page-about .timeline__text {
  position: relative;
  margin: 12px 0 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .timeline__item--current .timeline__text {
  color: rgba(244, 239, 230, 0.86);
}

.page-about .timeline__meta {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 16px 0 0;
  font-size: 12px;
  color: var(--graphite);
}

.page-about .timeline__item--current .timeline__meta {
  color: var(--soft);
}

.page-about .about-timeline__figure {
  margin: 36px 0 0;
  border: 1px solid var(--about-card-border);
  background: var(--paper);
  transform: rotate(0.5deg);
}

.page-about .about-timeline__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.page-about .about-timeline__figure .img-frame__caption {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: space-between;
  padding: 12px 16px;
  border-top: 1px solid var(--about-soft-line);
  font-size: 12px;
  color: var(--graphite);
}

.page-about .about-timeline__figure .mono {
  color: var(--orange-deep);
  letter-spacing: 0.06em;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  background: var(--cream);
}

.page-about .about-team__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
}

.page-about .about-team__lead .eyebrow {
  color: var(--orange-deep);
}

.page-about .about-team__figure {
  margin: 26px 0 0;
  border: 1px solid var(--about-card-border);
  background: var(--ink-blue);
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
  opacity: 0.9;
}

.page-about .about-team__accordion .accordion__item {
  border: 1px solid var(--about-card-border);
  background: var(--paper);
  border-radius: var(--radius);
  margin-bottom: 12px;
  overflow: hidden;
}

.page-about .about-team__accordion .accordion__trigger {
  display: flex;
  width: 100%;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 16px 18px;
  background: transparent;
  border: 0;
  text-align: left;
  cursor: pointer;
  color: var(--ink);
}

.page-about .about-team__accordion .accordion__trigger:hover .about-team__hint {
  color: var(--orange-deep);
}

.page-about .about-team__role {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.page-about .about-team__count {
  font-size: 22px;
  color: var(--orange);
  margin-right: 4px;
}

.page-about .about-team__hint {
  font-size: 12px;
  color: var(--graphite);
  transition: color 0.2s ease;
}

.page-about .about-team__accordion .accordion__panel {
  padding: 0 18px 18px;
  border-top: 1px solid var(--about-soft-line);
}

.page-about .about-team__accordion .accordion__panel p {
  margin: 14px 0 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-team__accordion .accordion__trigger[aria-expanded="true"] {
  border-left: 3px solid var(--mint);
}

/* ---------- 数据来源 ---------- */
.page-about .about-sources {
  background: var(--sea);
  color: var(--cream);
}

.page-about .about-sources .eyebrow {
  color: var(--orange);
}

.page-about .about-sources .section__title {
  color: #fff;
}

.page-about .about-sources__grid {
  margin-top: 34px;
}

.page-about .about-sources__card {
  margin-bottom: 18px;
  padding: 22px 20px;
}

.page-about .about-sources__card.card--panel {
  background: var(--ink-blue);
  border-color: var(--line);
  color: var(--cream);
}

.page-about .about-sources__card.card--panel .card__title {
  color: #fff;
}

.page-about .about-sources__card.card--panel .card__text {
  color: rgba(244, 239, 230, 0.84);
}

.page-about .about-sources__card .card__title {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-sources__card .card__text {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-sources__card .card__meta {
  margin: 16px 0 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--orange-deep);
}

.page-about .about-sources__card.card--panel .card__meta {
  color: var(--mint);
}

.page-about .about-sources__note {
  margin-top: 24px;
  padding: 20px 22px;
  border-left: 3px solid var(--mint);
  background: rgba(255, 255, 255, 0.04);
}

.page-about .about-sources__note p {
  margin: 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(244, 239, 230, 0.86);
}

/* ---------- 地域 ---------- */
.page-about .about-region {
  background: var(--cream);
}

.page-about .about-region__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .about-region .eyebrow {
  color: var(--orange-deep);
}

.page-about .about-region__text .prose {
  margin-top: 18px;
}

.page-about .about-region__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-region__plate {
  background: var(--paper);
  border: 1px solid var(--about-card-border);
  padding: 20px 20px 8px;
  transform: rotate(-0.7deg);
}

.page-about .about-region__plate-label {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--steel);
}

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

.page-about .about-region__row {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px;
  padding: 12px 0;
  border-top: 1px solid var(--about-soft-line);
}

.page-about .about-region__row dt {
  font-size: 13px;
  color: var(--graphite);
}

.page-about .about-region__row dd {
  margin: 0;
  font-size: 14px;
  font-weight: 500;
  color: var(--ink);
}

.page-about .about-region__row dd.mono {
  letter-spacing: 0.02em;
}

.page-about .about-region__row dd .mono {
  color: var(--orange-deep);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-rhythm {
  background: var(--paper);
  border-top: 1px solid var(--about-soft-line);
}

.page-about .about-rhythm .eyebrow {
  color: var(--orange-deep);
}

.page-about .rhythm-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 34px;
}

.page-about .rhythm-grid__cell {
  background: var(--paper);
  border: 1px solid var(--about-card-border);
  border-top: 3px solid var(--sea);
  padding: 20px 18px;
  transform: rotate(0.3deg);
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.page-about .rhythm-grid__cell:hover {
  transform: translateY(-2px) rotate(0.3deg);
  border-color: var(--orange);
}

.page-about .rhythm-grid__cell--mint {
  border-top-color: var(--mint);
}

.page-about .rhythm-grid__value {
  margin: 0;
  font-size: 26px;
  font-weight: 500;
  color: var(--orange);
  letter-spacing: 0.01em;
}

.page-about .rhythm-grid__cell--mint .rhythm-grid__value {
  color: #1F8F6C;
}

.page-about .rhythm-grid__title {
  margin: 10px 0 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .rhythm-grid__text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--graphite);
}

.page-about .about-rhythm__cta {
  display: grid;
  gap: 18px;
  margin-top: 34px;
  padding: 24px 22px;
  background: var(--sea);
  border-left: 3px solid var(--orange);
}

.page-about .about-rhythm__cta-text {
  margin: 0;
  max-width: 30em;
  color: var(--cream);
  font-size: 17px;
  line-height: 1.7;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-hero {
    padding-top: 52px;
  }

  .page-about .about-hero__inner {
    gap: 40px;
    padding-bottom: 72px;
  }

  .page-about .about-who__inner {
    grid-template-columns: 5fr 7fr;
    gap: 40px;
    align-items: start;
  }

  .page-about .about-who__head {
    position: sticky;
    top: calc(var(--bar-h) + 64px);
  }

  .page-about .about-team__inner {
    grid-template-columns: 6fr 6fr;
    gap: 38px;
    align-items: start;
  }

  .page-about .about-region__inner {
    grid-template-columns: 7fr 5fr;
    gap: 40px;
    align-items: start;
  }

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

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

  .page-about .about-timeline__figure img {
    aspect-ratio: 16 / 9;
  }

  .page-about .about-sources__grid {
    display: grid;
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .about-sources__card {
    margin-bottom: 0;
  }

  .page-about .about-sources__card.span-5 {
    grid-column: span 5;
  }

  .page-about .about-sources__card.span-4 {
    grid-column: span 4;
  }

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

  .page-about .about-sources__card.card--tilt {
    transform: rotate(-1.1deg) translateY(10px);
  }

  .page-about .about-sources__card.span-3 {
    transform: rotate(0.8deg) translateY(20px);
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__inner {
    grid-template-columns: 7fr 5fr;
    gap: 48px;
    align-items: center;
  }

  .page-about .about-hero__media {
    transform: rotate(-1deg) translateY(-8px);
  }

  .page-about .timeline {
    padding-left: 26px;
  }

  .page-about .timeline__item {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 28px;
    align-items: start;
    padding-bottom: 42px;
  }

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

  .page-about .timeline__item::before {
    left: -34px;
  }

  .page-about .timeline__item:nth-child(odd) .timeline__card {
    transform: translateX(0) rotate(-0.35deg);
  }

  .page-about .timeline__item:nth-child(even) .timeline__card {
    transform: translateX(24px) rotate(0.35deg);
  }

  .page-about .timeline__item:hover .timeline__card {
    transform: translateX(0) rotate(0deg);
  }

  .page-about .about-timeline__figure {
    margin-left: auto;
    max-width: 62%;
  }

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

  .page-about .rhythm-grid__cell--wide {
    grid-column: span 2;
    grid-row: span 2;
  }

  .page-about .about-rhythm__cta {
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .timeline__card,
  .page-about .rhythm-grid__cell,
  .page-about .about-hero__media,
  .page-about .about-timeline__figure,
  .page-about .about-region__plate,
  .page-about .about-sources__card.card--tilt,
  .page-about .about-sources__card.span-3 {
    transform: none !important;
    transition: none;
  }
}