.page-about {
  --about-rule: rgba(201, 162, 75, 0.42);
  --about-navy-line: rgba(20, 69, 111, 0.16);
  background: var(--pearl);
  color: var(--ink);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 40px 0 56px;
  background: var(--pearl);
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -14%;
  left: -26%;
  width: 82%;
  height: 132%;
  background: var(--navy);
  clip-path: polygon(0 0, 100% 0, 58% 100%, 0 100%);
  opacity: 0.06;
  z-index: -1;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -18%;
  bottom: -34%;
  width: 66%;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: radial-gradient(circle at 42% 42%, rgba(255, 107, 74, 0.26), rgba(255, 107, 74, 0) 68%);
  z-index: -1;
  pointer-events: none;
}

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

.page-about .about-hero .breadcrumbs {
  margin-bottom: 22px;
}

.page-about .about-hero__title {
  margin: 16px 0 0;
  max-width: 16ch;
  font-family: var(--font-head);
  font-weight: 300;
  font-size: clamp(2.05rem, 8vw, 4.4rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--navy);
}

.page-about .about-hero__lead {
  margin: 22px 0 0;
  max-width: 52ch;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--slate);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 30px;
  margin: 34px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--about-rule);
  list-style: none;
  font-size: 0.875rem;
  color: var(--slate);
}

.page-about .about-hero__meta li {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .about-hero__meta .mono {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--navy);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  background: var(--paper);
}

.page-about .timeline {
  margin-top: 48px;
}

.page-about .timeline__rail {
  display: flex;
  gap: 8px;
  margin-bottom: 36px;
  padding-bottom: 4px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .timeline__rail-link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid var(--navy-mid);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--navy);
  text-decoration: none;
  transition: background 160ms var(--ease), color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .timeline__rail-link:hover,
.page-about .timeline__rail-link:focus-visible {
  background: var(--navy);
  border-color: var(--navy);
  color: var(--pearl);
}

.page-about .timeline__items {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  border-left: 1px solid var(--about-rule);
  display: grid;
  gap: 58px;
}

.page-about .timeline__item {
  position: relative;
  scroll-margin-top: 110px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 14px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--coral);
  box-shadow: 0 0 0 5px rgba(255, 107, 74, 0.14);
}

.page-about .timeline__year {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: clamp(2.35rem, 9vw, 3.5rem);
  font-weight: 300;
  line-height: 0.95;
  letter-spacing: -0.045em;
  color: var(--navy);
}

.page-about .timeline__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--ink);
}

.page-about .timeline__text {
  margin: 0;
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .timeline__note {
  margin: 14px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--gold);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--foam);
}

/* ---------- 宽幅图位 ---------- */
.page-about .about-figure {
  padding: 0 0 8px;
  background: var(--pearl);
}

.page-about .about-figure .media-frame {
  margin-top: -1px;
}

/* ---------- 三件事 ---------- */
.page-about .about-core {
  background: var(--navy);
  color: var(--pearl);
}

.page-about .about-core .section-head__title {
  color: var(--pearl);
}

.page-about .about-core .section-head__lead {
  color: rgba(247, 244, 239, 0.74);
}

.page-about .about-core .eyebrow {
  color: var(--coral);
}

.page-about .about-core__grid {
  display: grid;
  gap: 1px;
  margin-top: 46px;
  background: rgba(201, 162, 75, 0.3);
  border: 1px solid rgba(201, 162, 75, 0.3);
}

.page-about .core-card {
  background: var(--navy-deep);
  padding: 30px 24px 32px;
}

.page-about .core-card__index {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-about .core-card h3 {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--pearl);
}

.page-about .core-card p {
  margin: 0;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(247, 244, 239, 0.78);
}

.page-about .core-card p.core-card__fact {
  margin-top: 20px;
  padding-top: 15px;
  border-top: 1px solid rgba(201, 162, 75, 0.28);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.05em;
  color: var(--coral);
}

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

.page-about .team-band {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 46px;
  background: rgba(20, 69, 111, 0.16);
  border: 1px solid rgba(20, 69, 111, 0.16);
}

.page-about .team-band__cell {
  background: var(--navy);
  padding: 26px 20px 24px;
}

.page-about .team-band__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 6vw, 2.75rem);
  font-weight: 300;
  line-height: 1;
  letter-spacing: -0.035em;
  color: var(--coral);
}

.page-about .team-band__label {
  display: block;
  margin-top: 12px;
  font-size: 0.875rem;
  line-height: 1.6;
  color: rgba(247, 244, 239, 0.74);
}

.page-about .team-roles {
  display: grid;
  gap: 22px;
  margin-top: 36px;
}

.page-about .role-card {
  background: var(--pearl);
  border: 1px solid var(--about-navy-line);
  border-radius: var(--radius);
  padding: 26px 24px 28px;
  transition: transform 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .role-card:hover {
  transform: translateY(-3px);
  border-color: var(--navy-mid);
}

.page-about .role-card h3 {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--navy);
}

.page-about .role-card p {
  margin: 0;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .team-note {
  margin: 30px 0 0;
  padding: 18px 20px;
  border-left: 2px solid var(--foam);
  background: rgba(46, 127, 143, 0.07);
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--slate);
}

/* ---------- 版本节奏 ---------- */
.page-about .about-rhythm {
  background: var(--pearl);
}

.page-about .rhythm-visual {
  margin-top: 44px;
}

.page-about .rhythm-grid {
  display: grid;
  gap: 18px;
  margin-top: 36px;
}

.page-about .rhythm-card {
  padding: 26px 22px 28px;
  background: var(--paper);
  border-top: 3px solid var(--coral);
  border-radius: 0 0 4px 4px;
}

.page-about .rhythm-card__season {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--foam);
}

.page-about .rhythm-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.55;
  color: var(--navy);
}

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

/* ---------- 稳定性 ---------- */
.page-about .about-stability {
  background: var(--pearl);
  padding-top: 0;
}

.page-about .habit-list {
  list-style: none;
  margin: 44px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-rule);
  border-top: 1px solid var(--about-rule);
  border-bottom: 1px solid var(--about-rule);
}

.page-about .habit {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  padding: 26px 4px 28px;
  background: var(--pearl);
}

.page-about .habit__num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 300;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--gold);
}

.page-about .habit__body h3 {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--navy);
}

.page-about .habit__body p {
  margin: 0;
  max-width: 66ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink);
}

/* ---------- 区域与备案 ---------- */
.page-about .about-region {
  background: var(--paper);
}

.page-about .region-layout {
  display: grid;
  gap: 40px;
}

.page-about .region-title {
  margin: 14px 0 18px;
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 4.2vw, 2.2rem);
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: -0.015em;
  color: var(--navy);
}

.page-about .region-layout__text p {
  margin: 0 0 16px;
  max-width: 56ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .region-graph {
  display: block;
  width: 100%;
  height: auto;
  margin-bottom: 22px;
}

.page-about .region-points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .region-point {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 14px;
  border-left: 2px solid var(--foam);
  background: rgba(46, 127, 143, 0.08);
}

.page-about .region-point--main {
  border-left-color: var(--coral-deep);
  background: rgba(255, 107, 74, 0.1);
}

.page-about .region-point__city {
  font-family: var(--font-head);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--navy);
}

.page-about .region-point__role {
  font-size: 0.8125rem;
  color: var(--slate);
}

.page-about .region-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 18px;
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--about-rule);
}

.page-about .region-legal__label {
  margin: 0;
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--slate);
}

.page-about .region-legal__value {
  margin: 0;
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--navy);
}

/* ---------- 收束 ---------- */
.page-about .about-closing {
  background: var(--paper);
  padding-bottom: 44px;
}

.page-about .closing-stack {
  position: relative;
}

.page-about .closing-stack__sheet {
  position: absolute;
  display: block;
  border-radius: var(--radius);
  border: 1px solid var(--about-rule);
  background: var(--pearl);
  pointer-events: none;
}

.page-about .closing-stack__sheet--back {
  inset: 18px 14px -14px 14px;
  opacity: 0.6;
}

.page-about .closing-stack__sheet--mid {
  inset: 9px 7px -7px 7px;
  opacity: 0.85;
}

.page-about .closing-stack__card {
  position: relative;
  z-index: 1;
  padding: 36px 26px 38px;
  border-radius: var(--radius);
  background: var(--navy);
  color: var(--pearl);
}

.page-about .closing-stack__card .eyebrow {
  color: var(--coral);
}

.page-about .closing-title {
  margin: 14px 0 16px;
  max-width: 24ch;
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 4.4vw, 2.25rem);
  font-weight: 300;
  line-height: 1.3;
  letter-spacing: -0.015em;
  color: var(--pearl);
}

.page-about .closing-lead {
  margin: 0;
  max-width: 52ch;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(247, 244, 239, 0.78);
}

.page-about .closing-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .closing-list {
  list-style: none;
  margin: 28px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid rgba(201, 162, 75, 0.3);
  display: grid;
  gap: 12px;
}

.page-about .closing-list a {
  display: inline-block;
  min-height: 32px;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: rgba(247, 244, 239, 0.82);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero {
    padding: 56px 0 72px;
  }

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

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

  .page-about .habit {
    grid-template-columns: 72px minmax(0, 1fr);
    gap: 24px;
    padding: 30px 4px 32px;
  }

  .page-about .habit__num {
    font-size: 2rem;
  }

  .page-about .closing-stack__card {
    padding: 44px 44px 46px;
  }
}

@media (min-width: 900px) {
  .page-about .timeline {
    display: grid;
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .timeline__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 0;
    padding-bottom: 0;
    overflow: visible;
    position: sticky;
    top: 120px;
    align-self: start;
  }

  .page-about .timeline__rail-link {
    width: 100%;
    justify-content: center;
    padding: 0 14px;
  }

  .page-about .timeline__item:nth-child(even) {
    margin-left: 40px;
  }

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

  .page-about .team-band {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 1080px) {
  .page-about .rhythm-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-hero__title {
    max-width: 14ch;
  }
}

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

  .page-about .role-card:hover {
    transform: none;
  }
}