.page-about {
  background: var(--cream);
  color: var(--text);
  font-family: var(--font-body);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  background:
    radial-gradient(120% 90% at 12% 8%, rgba(200, 151, 63, 0.14), transparent 58%),
    linear-gradient(160deg, var(--ink) 0%, var(--ink-deep) 100%);
  color: var(--cream);
  padding: calc(var(--header-h) + 56px) 0 64px;
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(232, 199, 126, 0.45), transparent);
}

.page-about .about-hero__crumb {
  margin-bottom: 28px;
  font-size: 13px;
  color: rgba(244, 239, 228, 0.66);
}

.page-about .about-hero__crumb a {
  color: rgba(244, 239, 228, 0.82);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

.page-about .about-hero__crumb a:hover,
.page-about .about-hero__crumb a:focus-visible {
  color: var(--gold-soft);
  border-bottom-color: var(--gold-soft);
}

.page-about .about-hero__crumb [aria-current="page"] {
  color: var(--gold-soft);
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  gap: 28px;
  padding: 26px;
  border: 1px solid rgba(232, 199, 126, 0.3);
  border-radius: var(--radius);
}

.page-about .about-hero__grid::before {
  content: "";
  position: absolute;
  inset: 6px;
  border: 1px solid rgba(232, 199, 126, 0.14);
  border-radius: 2px;
  pointer-events: none;
}

.page-about .about-hero__copy .eyebrow {
  color: var(--gold-soft);
}

.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-weight: 300;
  font-size: clamp(34px, 6.2vw, 64px);
  line-height: 1.24;
  letter-spacing: 0.01em;
  margin: 14px 0 0;
  color: var(--cream);
}

.page-about .about-hero__line {
  display: inline;
  color: var(--gold-soft);
}

.page-about .about-hero .lead {
  margin: 22px 0 0;
  max-width: 34em;
  font-size: clamp(16px, 1.4vw, 18px);
  line-height: 1.9;
  color: rgba(244, 239, 228, 0.86);
}

.page-about .about-hero__marks {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  font-size: 14px;
  color: rgba(244, 239, 228, 0.76);
}

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

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

.page-about .about-hero__figure .figure__frame {
  border-color: rgba(232, 199, 126, 0.28);
  background: rgba(7, 26, 21, 0.4);
  box-shadow: 6px 8px 0 rgba(7, 26, 21, 0.55);
}

.page-about .about-hero__figure .figure__caption {
  color: rgba(244, 239, 228, 0.62);
}

/* ---------- 正文骨架 ---------- */
.page-about .about-body {
  padding: 56px 0 72px;
}

.page-about .about-layout {
  display: grid;
  gap: 28px;
}

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

/* ---------- 左窄栏章节索引 ---------- */
.page-about .about-rail__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.26em;
  color: var(--muted);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__list li {
  flex: 0 0 auto;
}

.page-about .about-rail__list a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  white-space: nowrap;
  padding: 9px 14px;
  font-size: 14px;
  line-height: 1.4;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--paper);
  transition: color 180ms var(--ease), border-color 180ms var(--ease), background 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--ink);
  border-color: var(--gold);
  background: rgba(232, 199, 126, 0.22);
  transform: translateY(-2px);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--gold);
}

/* ---------- 章节块 ---------- */
.page-about .about-block {
  padding: 40px 0 6px;
  border-top: 1px solid var(--line);
}

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

.page-about .about-block + .about-block {
  margin-top: 44px;
}

.page-about .about-block__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 18px;
}

.page-about .about-block__head .index-num {
  color: var(--gold);
  flex: 0 0 auto;
}

.page-about .about-block h2 {
  font-family: var(--font-head);
  font-weight: 500;
  font-size: clamp(25px, 3.2vw, 38px);
  line-height: 1.32;
  letter-spacing: 0.01em;
  margin: 0;
  color: var(--ink);
}

.page-about .about-block__lead {
  margin: 0 0 24px;
  max-width: 36em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-block .prose p {
  margin: 0 0 18px;
  max-width: 36em;
  font-size: 17px;
  line-height: 1.9;
  color: var(--text);
}

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

.page-about .about-quote {
  margin: 28px 0 0;
  padding: 18px 0 18px 22px;
  border-left: 2px solid var(--gold);
  background: linear-gradient(90deg, rgba(200, 151, 63, 0.1), transparent 72%);
}

.page-about .about-quote p {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 400;
  font-size: clamp(19px, 2.2vw, 24px);
  line-height: 1.7;
  color: var(--ink);
}

/* ---------- 阶段时间轴 ---------- */
.page-about .about-phases {
  list-style: none;
  margin: 0 0 12px;
  padding: 0;
  counter-reset: none;
}

.page-about .phase {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 14px 18px 0;
  border-bottom: 1px dashed var(--line);
  transition: background 200ms var(--ease);
}

.page-about .phase:last-child {
  border-bottom: 0;
}

.page-about .phase:hover,
.page-about .phase:focus-within {
  background: rgba(200, 151, 63, 0.08);
}

.page-about .phase__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--gold);
  padding-top: 5px;
  padding-left: 12px;
  border-left: 2px solid var(--gold-soft);
}

.page-about .phase__name {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-weight: 500;
  font-size: 21px;
  letter-spacing: 0.04em;
  color: var(--ink);
}

.page-about .phase__body p {
  margin: 0;
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 数据卡片 ---------- */
.page-about .about-stats {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .stat {
  perspective: 900px;
  height: 170px;
  outline: none;
}

.page-about .stat__inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 340ms var(--ease);
}

.page-about .stat:hover .stat__inner,
.page-about .stat:focus-visible .stat__inner {
  transform: rotateY(180deg);
}

.page-about .stat__face {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 18px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--paper);
  box-shadow: var(--shadow-paper);
  backface-visibility: hidden;
  overflow: hidden;
}

.page-about .stat__face--front {
  align-items: flex-start;
}

.page-about .stat__face--front::after {
  content: "";
  position: absolute;
  right: 14px;
  bottom: 14px;
  width: 22px;
  height: 2px;
  background: var(--gold-soft);
}

.page-about .stat__num {
  font-family: var(--font-mono);
  font-size: clamp(34px, 5vw, 44px);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .stat__label {
  font-size: 14px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.page-about .stat__face--back {
  transform: rotateY(180deg);
  background: linear-gradient(155deg, var(--ink) 0%, var(--ink-deep) 100%);
  border-color: var(--ink);
  box-shadow: var(--shadow-lift);
  justify-content: center;
}

.page-about .stat__face--back p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(244, 239, 228, 0.9);
}

.page-about .stat:focus-visible {
  box-shadow: 0 0 0 2px var(--teal);
  border-radius: var(--radius);
}

/* ---------- 团队 ---------- */
.page-about .about-team__figure {
  margin: 0 0 24px;
}

.page-about .about-team__prose {
  max-width: 40em;
}

.page-about .team-split {
  display: grid;
  gap: 1px;
  margin-top: 26px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .team-split__item {
  background: var(--paper);
  padding: 20px 18px;
  transition: background 200ms var(--ease);
}

.page-about .team-split__item:hover {
  background: rgba(232, 199, 126, 0.18);
}

.page-about .team-split__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 28px;
  line-height: 1;
  color: var(--gold);
}

.page-about .team-split__name {
  margin: 12px 0 8px;
  font-family: var(--font-head);
  font-weight: 500;
  font-size: 18px;
  color: var(--ink);
}

.page-about .team-split__item p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 图文并排（内容标准） ---------- */
.page-about .about-split {
  display: grid;
  gap: 26px;
}

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

.page-about .about-split__text .prose p {
  margin: 0 0 20px;
}

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

.page-about .rule-list li {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 12px;
  padding: 16px 18px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold-soft);
  border-radius: var(--radius);
  box-shadow: var(--shadow-paper);
  transition: transform 200ms var(--ease), box-shadow 200ms var(--ease);
}

.page-about .rule-list li:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lift);
}

.page-about .rule-list__mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1px solid var(--gold);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--gold);
}

.page-about .rule-list h3 {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-weight: 500;
  font-size: 18px;
  color: var(--ink);
}

.page-about .rule-list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-note {
  margin: 22px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 四件事 ---------- */
.page-about .about-actions {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .action-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 22px 20px 20px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-paper);
  transition: transform 200ms var(--ease), box-shadow 200ms var(--ease), border-color 200ms var(--ease);
}

.page-about .action-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  bottom: 22px;
  width: 2px;
  background: var(--gold-soft);
  transition: background 200ms var(--ease);
}

.page-about .action-card:hover,
.page-about .action-card:focus-within {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lift);
  border-color: var(--gold);
}

.page-about .action-card:hover::before,
.page-about .action-card:focus-within::before {
  background: var(--gold);
}

.page-about .action-card__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-weight: 500;
  font-size: 20px;
  line-height: 1.5;
}

.page-about .action-card__title a {
  color: var(--ink);
  text-decoration: none;
  background-image: linear-gradient(transparent 62%, rgba(232, 199, 126, 0.7) 62%);
  background-repeat: no-repeat;
  background-size: 100% 100%;
  transition: background-size 200ms var(--ease);
}

.page-about .action-card__title a:hover,
.page-about .action-card__title a:focus-visible {
  background-size: 100% 100%;
  color: var(--ink-deep);
}

.page-about .action-card p {
  margin: 0;
  flex: 1 1 auto;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .action-card__go {
  display: inline-block;
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

/* ---------- 末尾引导 ---------- */
.page-about .about-cta {
  background:
    linear-gradient(180deg, rgba(7, 26, 21, 0) 0%, rgba(7, 26, 21, 0.85) 100%),
    linear-gradient(155deg, var(--ink) 0%, var(--ink-deep) 100%);
  color: var(--cream);
  padding: 64px 0 72px;
}

.page-about .about-cta__eyebrow {
  color: var(--gold-soft);
}

.page-about .about-cta h2 {
  margin: 12px 0 0;
  font-family: var(--font-head);
  font-weight: 300;
  font-size: clamp(26px, 4vw, 44px);
  line-height: 1.3;
  color: var(--cream);
}

.page-about .about-cta__text {
  margin: 18px 0 0;
  max-width: 38em;
  font-size: 16px;
  line-height: 1.9;
  color: rgba(244, 239, 228, 0.82);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 780px) {
  .page-about .about-split {
    grid-template-columns: 5fr 7fr;
    gap: 36px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    align-items: end;
    gap: 40px;
    padding: 34px;
  }

  .page-about .about-hero__line {
    display: block;
  }

  .page-about .phase {
    grid-template-columns: 56px minmax(0, 1fr);
    gap: 20px;
  }
}

@media (min-width: 980px) {
  .page-about .about-body {
    padding: 72px 0 96px;
  }

  .page-about .about-layout {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: 64px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 32px);
    align-self: start;
  }

  .page-about .about-rail__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .about-rail__list a {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: transparent;
    margin-left: -1px;
    padding: 9px 12px;
    white-space: normal;
    font-size: 15px;
  }

  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a:focus-visible {
    background: transparent;
    border-left-color: var(--gold);
    transform: none;
    padding-left: 16px;
  }

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

  .page-about .about-block + .about-block {
    margin-top: 56px;
  }

  .page-about .about-block {
    padding: 48px 0 10px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero {
    padding: calc(var(--header-h) + 72px) 0 88px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__list a,
  .page-about .rule-list li,
  .page-about .action-card,
  .page-about .team-split__item {
    transition: none;
  }

  .page-about .stat {
    height: auto;
    perspective: none;
  }

  .page-about .stat__inner {
    height: auto;
    transform: none !important;
  }

  .page-about .stat:hover .stat__inner,
  .page-about .stat:focus-visible .stat__inner {
    transform: none;
  }

  .page-about .stat__face {
    position: static;
    transform: none !important;
    backface-visibility: visible;
  }

  .page-about .stat__face--back {
    margin-top: -1px;
    min-height: 120px;
  }
}
</main>