.page-about {
  --about-rail-w: 208px;
  --about-node-line: rgba(255, 122, 47, 0.75);
  background:
    radial-gradient(120% 62% at 100% 0%, rgba(123, 63, 228, 0.16), transparent 62%),
    var(--deep);
  color: var(--cream);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-top: clamp(1.4rem, 3.5vw, 2.6rem);
  padding-bottom: clamp(2.2rem, 5vw, 3.6rem);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -20%;
  right: -14%;
  width: min(760px, 88vw);
  height: min(520px, 64vw);
  background: var(--grad-cool);
  opacity: 0.2;
  border-radius: 46% 54% 38% 62% / 52% 40% 60% 48%;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  left: -16%;
  bottom: -8%;
  width: min(620px, 72vw);
  height: min(320px, 42vw);
  background: radial-gradient(closest-side, rgba(214, 40, 57, 0.34), transparent 72%);
  pointer-events: none;
}

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

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(1.5rem, 4vw, 2.6rem);
}

.page-about .about-hero .display-title {
  max-width: 22ch;
  margin: 0.35rem 0 0;
  letter-spacing: -0.02em;
}

.page-about .about-hero .lede {
  max-width: 60ch;
  margin-top: 1.1rem;
  color: rgba(246, 241, 231, 0.82);
}

.page-about .about-hero__media {
  margin-top: clamp(1.8rem, 4vw, 3rem);
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--line-strong);
  box-shadow: var(--shadow-2);
  background: var(--deep-ink);
}

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

/* ---------- 数字摘要条 ---------- */
.page-about .about-stats {
  padding-bottom: clamp(2rem, 4vw, 3rem);
}

.page-about .about-stats__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1.15rem 1.05rem;
  background: var(--panel);
}

.page-about .about-stat__num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.35rem, 2.6vw, 1.85rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--gold);
}

.page-about .about-stat:nth-child(2n) .about-stat__num {
  color: var(--neon);
}

.page-about .about-stat__label {
  font-size: 0.86rem;
  line-height: 1.6;
  color: rgba(246, 241, 231, 0.72);
}

/* ---------- 主布局：索引轨道 + 内容流 ---------- */
.page-about .about-layout {
  display: grid;
  gap: clamp(1.6rem, 3vw, 2.6rem);
  padding-bottom: clamp(3rem, 6vw, 5rem);
}

.page-about .about-rail {
  padding: 1rem 0.9rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(42, 47, 58, 0.86), rgba(11, 18, 48, 0.58));
}

.page-about .about-rail__title {
  margin: 0 0 0.7rem;
  font-family: var(--font-display);
  font-size: 0.74rem;
  font-weight: 900;
  letter-spacing: 0.22em;
  color: var(--gold);
}

.page-about .about-rail__list {
  display: flex;
  gap: 0.45rem;
  margin: 0;
  padding: 0 0 0.3rem;
  list-style: none;
  overflow-x: auto;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.5rem 0.8rem;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  color: rgba(246, 241, 231, 0.78);
  font-size: 0.88rem;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--cream);
  background: rgba(255, 122, 47, 0.14);
  border-color: rgba(255, 122, 47, 0.65);
}

.page-about .about-rail__link:focus-visible {
  outline: 3px solid rgba(233, 184, 76, 0.85);
  outline-offset: 2px;
}

.page-about .about-rail__no {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 0.78rem;
  font-variant-numeric: tabular-nums;
  color: var(--clay);
}

.page-about .about-layout:has(#origin:target) .about-rail__link[href="#origin"],
.page-about .about-layout:has(#timeline:target) .about-rail__link[href="#timeline"],
.page-about .about-layout:has(#team:target) .about-rail__link[href="#team"],
.page-about .about-layout:has(#hub:target) .about-rail__link[href="#hub"],
.page-about .about-layout:has(#reach:target) .about-rail__link[href="#reach"],
.page-about .about-layout:has(#trust:target) .about-rail__link[href="#trust"],
.page-about .about-layout:has(#next:target) .about-rail__link[href="#next"] {
  color: var(--cream);
  background: linear-gradient(135deg, rgba(214, 40, 57, 0.3), rgba(255, 122, 47, 0.2));
  border-color: rgba(255, 122, 47, 0.7);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding-top: clamp(2rem, 4.5vw, 3.4rem);
  border-top: 1px solid var(--line-soft);
  scroll-margin-top: 5rem;
}

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

.page-about .about-section__index {
  margin: 0 0 0.65rem;
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.2em;
  font-variant-numeric: tabular-nums;
  color: var(--gold);
}

.page-about .about-section:nth-of-type(even) .about-section__index {
  color: var(--neon);
}

.page-about .about-section > .section-title {
  margin: 0 0 0.9rem;
}

.page-about .about-section__lede {
  max-width: 64ch;
  margin: 0 0 1.5rem;
  line-height: 1.85;
  color: rgba(246, 241, 231, 0.78);
}

/* ---------- 01 起点 ---------- */
.page-about .about-split {
  display: grid;
  gap: 1.4rem;
}

.page-about .about-split__body p {
  margin: 0 0 1rem;
  line-height: 1.85;
  color: rgba(246, 241, 231, 0.85);
}

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

.page-about .about-quote {
  position: relative;
  overflow: hidden;
  margin: 0;
  padding: 1.5rem 1.4rem;
  border-radius: var(--radius-xl);
  border: 1px solid rgba(233, 184, 76, 0.4);
  background:
    linear-gradient(150deg, rgba(214, 40, 57, 0.2), rgba(123, 63, 228, 0.16) 60%, transparent),
    var(--panel);
}

.page-about .about-quote::before {
  content: "\201D";
  position: absolute;
  top: -1.6rem;
  right: 0.6rem;
  font-family: var(--font-display);
  font-size: 8rem;
  line-height: 1;
  color: rgba(233, 184, 76, 0.18);
  pointer-events: none;
}

.page-about .about-quote blockquote {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2.2vw, 1.4rem);
  font-weight: 800;
  line-height: 1.55;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.page-about .about-quote figcaption {
  margin-top: 0.9rem;
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  color: var(--gold);
}

/* ---------- 02 版本时间线 ---------- */
.page-about .about-timeline__media {
  margin-bottom: 1.6rem;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
}

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

.page-about .about-timeline {
  position: relative;
  display: grid;
  gap: 0.9rem;
  margin: 0;
  padding: 0 0 0 1.7rem;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0.42rem;
  top: 0.9rem;
  bottom: 0.9rem;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--red), var(--neon) 52%, var(--violet));
  opacity: 0.72;
}

.page-about .about-node {
  position: relative;
  padding: 1.05rem 1.15rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: var(--panel);
  transition: transform 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -1.62rem;
  top: 1.35rem;
  width: 0.68rem;
  height: 0.68rem;
  border-radius: 50%;
  background: var(--deep);
  border: 2px solid var(--neon);
  box-shadow: 0 0 0 4px rgba(255, 122, 47, 0.14);
}

.page-about .about-node:hover,
.page-about .about-node:focus-within {
  transform: translateX(5px);
  border-color: rgba(255, 122, 47, 0.7);
  background: rgba(42, 47, 58, 0.94);
}

.page-about .about-node__ver {
  display: inline-block;
  padding: 0.18rem 0.62rem;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(214, 40, 57, 0.55);
  background: rgba(214, 40, 57, 0.22);
  color: var(--cream);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  font-variant-numeric: tabular-nums;
}

.page-about .about-node__title {
  margin: 0.6rem 0 0.4rem;
  font-size: clamp(1.02rem, 1.8vw, 1.14rem);
  font-weight: 800;
  line-height: 1.5;
  color: var(--cream);
}

.page-about .about-node__text {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: rgba(246, 241, 231, 0.78);
}

.page-about .about-node__extra {
  display: grid;
  grid-template-rows: 0fr;
  margin-top: 0;
  opacity: 0;
  transition: grid-template-rows 0.3s ease, opacity 0.3s ease, margin-top 0.3s ease;
}

.page-about .about-node__extra-in {
  min-height: 0;
  overflow: hidden;
}

.page-about .about-node__extra-in p {
  margin: 0;
  padding-top: 0.6rem;
  border-top: 1px dashed var(--line);
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--clay);
}

.page-about .about-node:hover .about-node__extra,
.page-about .about-node:focus-within .about-node__extra {
  grid-template-rows: 1fr;
  margin-top: 0.5rem;
  opacity: 1;
}

/* ---------- 03 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 1.4rem;
}

.page-about .about-team__media {
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-1);
}

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

.page-about .about-team__body > p {
  margin: 0 0 1.2rem;
  line-height: 1.85;
  color: rgba(246, 241, 231, 0.85);
}

.page-about .about-team__list {
  display: grid;
  gap: 0.7rem;
  margin: 0 0 1.2rem;
  padding: 0;
  list-style: none;
}

.page-about .about-team__list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.85rem;
  align-items: baseline;
  padding: 0.75rem 0.9rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--line-soft);
  background: rgba(255, 255, 255, 0.035);
  font-size: 0.92rem;
  line-height: 1.7;
  color: rgba(246, 241, 231, 0.8);
}

.page-about .about-team__num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.35rem;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--gold);
}

.page-about .about-team__note {
  margin: 0;
  padding-left: 0.9rem;
  border-left: 3px solid var(--moss);
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(246, 241, 231, 0.74);
}

/* ---------- 04 万博中心 ---------- */
.page-about .about-hub {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.9rem;
}

.page-about .about-hub__card {
  padding: 1.15rem 1.2rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: var(--panel);
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.page-about .about-hub__card:hover {
  transform: translateY(-4px);
  border-color: rgba(123, 63, 228, 0.7);
}

.page-about .about-hub__card--wide {
  border-color: rgba(255, 122, 47, 0.4);
  background:
    linear-gradient(120deg, rgba(214, 40, 57, 0.22), rgba(123, 63, 228, 0.18) 70%, transparent),
    var(--panel);
}

.page-about .about-hub__card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
  font-weight: 800;
  line-height: 1.5;
  color: var(--cream);
}

.page-about .about-hub__card p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: rgba(246, 241, 231, 0.78);
}

/* ---------- 05 覆盖与伙伴 ---------- */
.page-about .about-reach {
  display: grid;
  gap: 1rem;
  margin-bottom: 1.3rem;
}

.page-about .about-reach__item {
  padding: 1.1rem 1.15rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(42, 47, 58, 0.82), rgba(11, 18, 48, 0.52));
}

.page-about .about-reach__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.6rem, 3.4vw, 2.2rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  background: var(--grad-warm);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

@supports not ((-webkit-background-clip: text) or (background-clip: text)) {
  .page-about .about-reach__num {
    color: var(--gold);
  }
}

.page-about .about-reach__label {
  margin: 0.55rem 0 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: rgba(246, 241, 231, 0.78);
}

.page-about .about-reach__note {
  margin: 0;
  padding: 1rem 1.15rem;
  border-radius: var(--radius-md);
  border: 1px solid rgba(94, 122, 85, 0.5);
  background: rgba(94, 122, 85, 0.14);
  font-size: 0.92rem;
  line-height: 1.85;
  color: rgba(246, 241, 231, 0.86);
}

/* ---------- 06 资质 ---------- */
.page-about .about-trust {
  display: grid;
  gap: 0.8rem;
}

.page-about .about-trust__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.9rem;
  padding: 1rem 1.1rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line-soft);
  background: rgba(255, 255, 255, 0.04);
}

.page-about .about-trust__mark {
  display: grid;
  place-items: center;
  width: 2.2rem;
  height: 2.2rem;
  border-radius: var(--radius-sm);
  background: var(--grad-warm);
  color: var(--deep);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 0.82rem;
  font-variant-numeric: tabular-nums;
}

.page-about .about-trust__title {
  margin: 0.15rem 0 0.45rem;
  font-size: 1rem;
  font-weight: 800;
  line-height: 1.5;
  color: var(--cream);
}

.page-about .about-trust__item p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(246, 241, 231, 0.76);
}

/* ---------- 07 下一步 ---------- */
.page-about .about-next {
  padding: clamp(1.3rem, 3vw, 1.9rem);
  border-radius: var(--radius-xl);
  border: 1px solid rgba(255, 122, 47, 0.35);
  background:
    linear-gradient(135deg, rgba(214, 40, 57, 0.2), rgba(123, 63, 228, 0.2) 55%, rgba(255, 122, 47, 0.14)),
    var(--panel);
}

.page-about .about-next p {
  margin: 0 0 1rem;
  line-height: 1.85;
  color: rgba(246, 241, 231, 0.86);
}

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

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  border-top: 1px solid var(--line-soft);
  background:
    radial-gradient(90% 130% at 12% 0%, rgba(255, 122, 47, 0.16), transparent 62%),
    rgba(11, 18, 48, 0.6);
  padding-block: clamp(2.2rem, 5vw, 3.6rem) clamp(3rem, 6vw, 4.6rem);
}

.page-about .about-cta__inner {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.page-about .about-cta .section-title {
  margin: 0;
}

.page-about .about-cta__text {
  max-width: 58ch;
  margin: 0;
  line-height: 1.85;
  color: rgba(246, 241, 231, 0.8);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 540px) {
  .page-about .about-stats__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 700px) {
  .page-about .about-hub {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 780px) {
  .page-about .about-reach {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-trust__item:first-child {
    grid-column: span 2;
  }
}

@media (min-width: 820px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 2rem;
    align-items: start;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
    gap: 2rem;
    align-items: center;
  }
}

@media (min-width: 960px) {
  .page-about .about-stats__grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(2rem, 4vw, 3.4rem);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 1.5rem;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0.25rem;
    padding: 0;
    overflow: visible;
  }

  .page-about .about-rail__link {
    width: 100%;
    white-space: normal;
  }

  .page-about .about-hub {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

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

  .page-about .about-hub__card--wide {
    grid-column: span 6;
  }
}

@media (hover: none) {
  .page-about .about-node__extra {
    grid-template-rows: 1fr;
    margin-top: 0.5rem;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node,
  .page-about .about-hub__card,
  .page-about .about-node__extra,
  .page-about .about-rail__link {
    transition: none;
  }

  .page-about .about-node:hover,
  .page-about .about-node:focus-within {
    transform: none;
  }

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