.page-about {
  --about-rule: 1px solid rgba(22, 26, 24, 0.15);
  --about-rule-light: 1px solid rgba(246, 241, 230, 0.22);
  background: var(--cream);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

.page-about .about-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.55em;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: rgba(246, 241, 230, 0.68);
  margin-bottom: clamp(18px, 3vw, 34px);
}

.page-about .about-crumbs a {
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease);
}

.page-about .about-crumbs a:hover {
  border-bottom-color: currentColor;
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  background:
    radial-gradient(circle at 84% 8%, rgba(201, 162, 83, 0.22), transparent 56%),
    var(--temple);
  color: var(--cream);
  padding-block: clamp(20px, 3vw, 34px) clamp(46px, 6vw, 90px);
  border-bottom: 2px solid var(--ink);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  align-items: start;
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.7em;
  margin: 0 0 clamp(12px, 2vw, 20px);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--gold);
}

.page-about .about-kicker::before {
  content: "";
  width: 34px;
  height: 1px;
  background: currentColor;
}

.page-about .about-kicker--light {
  color: var(--gold);
}

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.4rem, 9vw, 5.2rem);
  line-height: 1.02;
  letter-spacing: 0.02em;
}

.page-about .about-hero__lede {
  margin: clamp(18px, 3vw, 28px) 0 0;
  max-width: 46ch;
  font-size: clamp(0.95rem, 1.9vw, 1.0625rem);
  line-height: 1.85;
  color: rgba(246, 241, 230, 0.86);
}

.page-about .about-facts {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: clamp(16px, 2.4vw, 22px) 0 0;
  border-top: var(--about-rule-light);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px clamp(14px, 2vw, 26px);
}

.page-about .about-facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.page-about .about-facts__value {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(1.45rem, 3.4vw, 2rem);
  line-height: 1.1;
  color: var(--gold);
  letter-spacing: 0.02em;
}

.page-about .about-facts__label {
  font-size: 0.8125rem;
  line-height: 1.6;
  color: rgba(246, 241, 230, 0.72);
}

.page-about .about-hero__figure {
  margin: 0;
  background: var(--ink-green);
  border-color: var(--gold);
  box-shadow: var(--shadow-gold);
}

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

.page-about .about-hero__figure .media-frame__caption {
  color: rgba(246, 241, 230, 0.74);
}

/* ---------- 章节带 ---------- */
.page-about .about-band {
  padding-block: clamp(40px, 6vw, 84px);
  border-bottom: var(--about-rule);
}

.page-about .about-band--sand {
  background: var(--sand);
}

.page-about .about-band--dark {
  background: var(--ink-green);
  color: var(--cream);
  border-bottom-color: rgba(246, 241, 230, 0.16);
}

.page-about .about-band--indigo {
  background: var(--indigo);
  color: var(--cream);
  border-bottom: 0;
}

.page-about .chapter {
  display: grid;
  gap: clamp(16px, 3vw, 34px);
  padding-block: clamp(30px, 4.5vw, 56px);
  border-top: var(--about-rule);
  scroll-margin-top: 90px;
}

.page-about .chapter:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-band--dark .chapter {
  border-top-color: rgba(246, 241, 230, 0.18);
}

.page-about .about-band--dark .chapter:first-child {
  border-top: 0;
}

.page-about .chapter__index {
  display: flex;
  flex-direction: row;
  align-items: baseline;
  gap: 14px;
}

.page-about .chapter__no {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(2.1rem, 6vw, 3.4rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--temple);
  opacity: 0.82;
}

.page-about .about-band--dark .chapter__no {
  color: var(--gold);
  opacity: 1;
}

.page-about .chapter__tag {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--wine);
}

.page-about .about-band--dark .chapter__tag {
  color: var(--silver);
}

.page-about .chapter__body {
  min-width: 0;
}

.page-about .chapter__body h2 {
  margin: 0 0 clamp(14px, 2.4vw, 22px);
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.6rem, 4.2vw, 2.55rem);
  line-height: 1.24;
  letter-spacing: 0.01em;
}

.page-about .chapter__body h3 {
  margin: 0 0 8px;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 1rem;
  letter-spacing: 0.02em;
}

.page-about .chapter__body p {
  margin: 0 0 1em;
  font-size: 0.9688rem;
  line-height: 1.9;
  max-width: 64ch;
}

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

.page-about .chapter__note {
  margin-top: clamp(18px, 3vw, 28px);
  padding: 16px 18px;
  border-left: 3px solid var(--gold);
  background: rgba(14, 59, 67, 0.06);
}

.page-about .chapter__note p {
  margin: 0;
  font-size: 0.9063rem;
  line-height: 1.8;
  color: rgba(22, 26, 24, 0.82);
}

.page-about .chapter__cols {
  display: grid;
  gap: clamp(18px, 3vw, 32px);
  margin-top: clamp(18px, 3vw, 28px);
}

.page-about .chapter__col {
  padding-top: 16px;
  border-top: 2px solid rgba(14, 59, 67, 0.28);
}

.page-about .chapter__figure {
  margin: clamp(22px, 3.5vw, 34px) 0 0;
  background: var(--cream);
  border-color: var(--ink);
}

.page-about .about-band--dark .chapter__figure {
  background: var(--temple);
  border-color: var(--gold);
  box-shadow: var(--shadow-gold);
}

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

.page-about .about-band--dark .chapter__figure .media-frame__caption {
  color: rgba(246, 241, 230, 0.72);
}

.page-about .chapter__aside-line {
  margin-top: clamp(18px, 3vw, 26px) !important;
  padding-left: 16px;
  border-left: 2px solid var(--gold);
  font-size: 0.9063rem !important;
  color: rgba(246, 241, 230, 0.82);
}

/* ---------- 团队卡片 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 14px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .team-card {
  padding: clamp(18px, 3vw, 26px);
  background: var(--cream);
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-block);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  transform: translate(-3px, -3px);
  box-shadow: 13px 13px 0 rgba(14, 59, 67, 0.2);
}

.page-about .team-card__num {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(2.4rem, 6vw, 3.4rem);
  line-height: 1;
  color: var(--temple);
  letter-spacing: 0.02em;
}

.page-about .team-card__title {
  margin: 10px 0 8px !important;
  font-family: var(--font-display) !important;
  font-weight: 500 !important;
  font-size: 1.125rem !important;
  letter-spacing: 0.04em;
}

.page-about .team-card__text {
  margin: 0 !important;
  font-size: 0.9063rem !important;
  line-height: 1.85 !important;
  color: rgba(22, 26, 24, 0.84);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  list-style: none;
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 0;
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 24px 26px;
  border-left: 2px solid rgba(201, 162, 83, 0.42);
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 6px;
  width: 12px;
  height: 12px;
  background: var(--gold);
  border: 2px solid var(--ink-green);
  border-radius: 50%;
}

.page-about .about-band--dark .timeline__item::before {
  border-color: var(--ink-green);
}

.page-about .timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.875rem;
  letter-spacing: 0.12em;
  color: var(--gold);
  margin-bottom: 6px;
}

.page-about .timeline__title {
  margin: 0 0 6px !important;
  font-family: var(--font-display) !important;
  font-weight: 500 !important;
  font-size: 1.0625rem !important;
  letter-spacing: 0.03em;
}

.page-about .timeline__item p {
  margin: 0;
  font-size: 0.9063rem;
  line-height: 1.8;
  color: rgba(246, 241, 230, 0.78);
  max-width: 34ch;
}

/* ---------- 原则 ---------- */
.page-about .principles {
  list-style: none;
  margin: clamp(18px, 3vw, 28px) 0 0;
  padding: 0;
}

.page-about .principles__item {
  display: grid;
  gap: 4px 16px;
  padding: clamp(16px, 2.6vw, 22px) 0;
  border-top: var(--about-rule);
}

.page-about .principles__item:last-child {
  border-bottom: var(--about-rule);
}

.page-about .principles__no {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 1rem;
  letter-spacing: 0.1em;
  color: var(--gold);
  line-height: 1.6;
}

.page-about .principles__title {
  margin: 0 0 6px !important;
  font-family: var(--font-body) !important;
  font-weight: 500 !important;
  font-size: 1.0313rem !important;
}

.page-about .principles__item p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: rgba(22, 26, 24, 0.82);
}

/* ---------- 后续引导 ---------- */
.page-about .about-next {
  display: grid;
  gap: clamp(24px, 4vw, 46px);
  align-items: start;
}

.page-about .about-next__lead h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(1.7rem, 4.6vw, 2.7rem);
  line-height: 1.2;
  letter-spacing: 0.02em;
}

.page-about .about-next__text {
  margin: 0;
  max-width: 44ch;
  font-size: 0.9688rem;
  line-height: 1.9;
  color: rgba(246, 241, 230, 0.82);
}

.page-about .about-next__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-next__links a {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 15px 18px;
  font-family: var(--font-body);
  font-size: 1rem;
  letter-spacing: 0.04em;
  color: var(--cream);
  text-decoration: none;
  border: 1px solid rgba(246, 241, 230, 0.34);
  background: rgba(246, 241, 230, 0.05);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-next__links a:hover {
  background: rgba(201, 162, 83, 0.16);
  border-color: var(--gold);
  transform: translateX(4px);
}

.page-about .about-next__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-about .about-next__arrow {
  margin-left: auto;
  color: var(--gold);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 760px) {
  .page-about .principles__item {
    grid-template-columns: 56px minmax(0, 1fr);
    align-items: start;
  }

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

  .page-about .team-grid {
    grid-template-columns: 1.25fr 1fr 1.45fr;
    align-items: start;
  }

  .page-about .team-card:nth-child(2) {
    margin-top: 26px;
  }
}

@media (min-width: 880px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.6fr);
    align-items: start;
  }

  .page-about .about-hero__figure {
    margin-top: 40px;
  }

  .page-about .about-next {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: clamp(32px, 6vw, 80px);
  }
}

@media (min-width: 900px) {
  .page-about .chapter {
    grid-template-columns: minmax(120px, 0.24fr) minmax(0, 1fr);
    column-gap: clamp(28px, 5vw, 72px);
    align-items: start;
  }

  .page-about .chapter__index {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    position: sticky;
    top: 96px;
  }

  .page-about .chapter__tag {
    padding-left: 2px;
  }
}

@media (min-width: 820px) {
  .page-about .timeline {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 18px;
    border-top: 2px solid rgba(201, 162, 83, 0.42);
    padding-top: 22px;
    margin-top: 30px;
  }

  .page-about .timeline__item {
    padding: 0;
    border-left: 0;
  }

  .page-about .timeline__item::before {
    top: -30px;
    left: 0;
  }

  .page-about .timeline__item p {
    max-width: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .about-next__links a,
  .page-about .about-crumbs a {
    transition: none;
  }

  .page-about .team-card:hover,
  .page-about .about-next__links a:hover {
    transform: none;
  }
}