.page-about {
  background:
    radial-gradient(120% 80% at 82% 0%, rgba(139, 92, 246, 0.18), transparent 58%),
    linear-gradient(180deg, var(--space-800) 0%, var(--space-700) 42%, var(--space-800) 100%);
  color: var(--mist);
  overflow-x: clip;
}

.page-about section[id] {
  scroll-margin-top: 96px;
}

.page-about h2 {
  font-family: var(--font-display);
  font-size: clamp(1.45rem, 3.4vw, 2.35rem);
  line-height: 1.22;
  letter-spacing: 0.01em;
  margin: 0 0 16px;
  color: var(--mist);
}

.page-about h3 {
  font-family: var(--font-display);
  font-size: clamp(1.05rem, 2.2vw, 1.28rem);
  line-height: 1.35;
  margin: 0 0 10px;
  color: var(--mist);
}

.page-about p {
  color: var(--slate);
  line-height: 1.85;
  margin: 0 0 14px;
}

.page-about .about-section-head {
  max-width: 68ch;
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-section-head .lede {
  color: var(--slate);
  line-height: 1.85;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(44px, 8vw, 96px) 0 clamp(40px, 6vw, 72px);
}

.page-about .about-hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-hero-bg img {
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
  object-position: center;
  opacity: 0.3;
  display: block;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background:
    radial-gradient(90% 70% at 12% 6%, rgba(45, 226, 230, 0.16), transparent 60%),
    linear-gradient(180deg, rgba(4, 11, 24, 0.28) 0%, var(--space-800) 94%);
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 2;
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: clamp(18px, 3.5vw, 32px);
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.95rem, 6.2vw, 4rem);
  line-height: 1.08;
  letter-spacing: 0.02em;
  margin: 12px 0 20px;
  max-width: 20ch;
  color: var(--mist);
  text-shadow: 0 18px 42px rgba(4, 11, 24, 0.7);
}

.page-about .about-lede {
  max-width: 62ch;
  font-size: clamp(0.98rem, 2.1vw, 1.12rem);
  color: var(--slate);
  line-height: 1.9;
}

.page-about .about-hero-stats {
  list-style: none;
  margin: clamp(26px, 5vw, 46px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-hero-stats li {
  background: rgba(13, 33, 69, 0.78);
  padding: 16px 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4.4vw, 2.3rem);
  line-height: 1;
  color: var(--gold-soft);
  letter-spacing: 0.02em;
}

.page-about .stat-label {
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  color: var(--slate);
  line-height: 1.5;
}

/* ---------- 品牌起点 ---------- */
.page-about .about-origin-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  align-items: start;
}

.page-about .about-points {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-points li {
  position: relative;
  padding: 12px 16px 12px 34px;
  background: rgba(19, 44, 86, 0.62);
  border: 1px solid var(--line-soft);
  border-radius: 4px 14px 4px 14px;
  color: var(--mist);
  font-size: 0.93rem;
  line-height: 1.7;
}

.page-about .about-points li::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 50%;
  width: 8px;
  height: 8px;
  margin-top: -4px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 12px rgba(45, 226, 230, 0.8);
}

.page-about .about-origin-card {
  padding: clamp(20px, 3vw, 30px);
}

.page-about .about-card-kicker {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--gold);
  margin: 0 0 12px;
}

.page-about .about-origin-card h3 {
  color: var(--gold-soft);
}

.page-about .about-origin-card p {
  font-size: 0.94rem;
}

.page-about .about-origin-card .btn {
  margin-top: 8px;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 40px);
  align-items: start;
}

.page-about .about-index {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background: rgba(13, 33, 69, 0.66);
  padding: 16px 14px;
}

.page-about .about-index-title {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--slate);
  margin: 0 0 12px;
  padding-left: 4px;
}

.page-about .about-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
}

.page-about .about-index-list a {
  display: block;
  padding: 9px 12px;
  border-left: 2px solid var(--line-soft);
  color: var(--slate);
  text-decoration: none;
  font-size: 0.88rem;
  line-height: 1.5;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.page-about .about-index-list a:hover,
.page-about .about-index-list a:focus-visible {
  color: var(--gold-soft);
  border-left-color: var(--gold);
  background: rgba(232, 180, 90, 0.08);
  outline: none;
}

.page-about .about-index-version {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 14px 0 0;
  padding: 10px 12px;
  border-top: 1px solid var(--line-gold);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--gold-soft);
}

.page-about .about-track-figure {
  margin: 0 0 clamp(20px, 3vw, 30px);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: rgba(4, 11, 24, 0.6);
}

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

.page-about .about-track-figure .media-caption {
  padding: 12px 16px 14px;
  font-size: 0.8rem;
  color: var(--slate);
  line-height: 1.6;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-nodes {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-node {
  position: relative;
  padding: 0 0 14px 34px;
}

.page-about .about-node::after {
  content: "";
  position: absolute;
  left: 10px;
  top: 0;
  bottom: 0;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--gold) 0%, var(--violet) 52%, var(--cyan) 100%);
  opacity: 0.5;
}

.page-about .about-node:last-child::after {
  background: linear-gradient(180deg, var(--gold), transparent 92%);
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 20px;
  width: 14px;
  height: 14px;
  box-sizing: border-box;
  border-radius: 50%;
  border: 2px solid var(--gold);
  background: var(--space-800);
  box-shadow: 0 0 0 4px rgba(232, 180, 90, 0.14);
  z-index: 1;
}

.page-about .about-node details {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background: rgba(19, 44, 86, 0.66);
  overflow: hidden;
  transition: border-color 0.22s ease, box-shadow 0.22s ease;
}

.page-about .about-node details:hover {
  border-color: var(--line-gold);
}

.page-about .about-node details[open] {
  border-color: var(--line-gold);
  box-shadow: var(--shadow-deep);
}

.page-about .about-node summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-node summary::-webkit-details-marker {
  display: none;
}

.page-about .about-node summary::marker {
  content: "";
}

.page-about .about-node summary::before {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.05rem;
  line-height: 1;
  color: var(--gold);
}

.page-about .about-node details[open] summary::before {
  content: "–";
}

.page-about .about-node summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-about .about-node-year {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--gold-soft);
  white-space: nowrap;
}

.page-about .about-node-title {
  font-size: 0.95rem;
  color: var(--mist);
  line-height: 1.5;
}

.page-about .about-node-body {
  padding: 0 16px 14px;
  border-top: 1px solid var(--line-soft);
  margin-top: 0;
  padding-top: 12px;
}

.page-about .about-node-body p {
  margin: 0;
  font-size: 0.9rem;
}

/* ---------- 团队 ---------- */
.page-about .about-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  align-items: start;
}

.page-about .about-team-cards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-team-card {
  position: relative;
  background: rgba(19, 44, 86, 0.7);
  border: 1px solid var(--line-soft);
  border-radius: 20px 4px 20px 4px;
  padding: 20px 20px 18px;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.page-about .about-team-card:hover,
.page-about .about-team-card:focus-within {
  transform: translateY(-3px);
  border-color: var(--line-cyan);
  box-shadow: var(--shadow-lift);
}

.page-about .about-team-count {
  font-family: var(--font-mono);
  font-size: 0.86rem;
  letter-spacing: 0.08em;
  color: var(--cyan);
  margin: 0 0 8px;
}

.page-about .about-team-card h3 {
  margin-bottom: 8px;
}

.page-about .about-team-card p {
  margin: 0;
  font-size: 0.9rem;
}

.page-about .about-team-figure {
  margin: 0;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: rgba(4, 11, 24, 0.6);
}

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

.page-about .about-team-figure .media-caption {
  padding: 12px 16px 14px;
  font-size: 0.8rem;
  color: var(--slate);
  line-height: 1.6;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-flow {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .about-flow li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 12px;
  padding: 14px 16px;
  border-left: 3px solid var(--violet);
  background: linear-gradient(90deg, rgba(139, 92, 246, 0.16), rgba(19, 44, 86, 0.5) 55%);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.page-about .about-flow-step {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-about .about-flow strong {
  font-size: 0.95rem;
  color: var(--mist);
}

.page-about .about-flow span:last-child {
  font-size: 0.85rem;
  color: var(--slate);
  line-height: 1.6;
}

/* ---------- 服务覆盖 ---------- */
.page-about .about-metrics {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-metric {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 16px 14px;
  background: rgba(4, 11, 24, 0.55);
  border: 1px solid var(--line-soft);
  border-top: 2px solid var(--gold);
  border-radius: 4px 4px var(--radius-md) var(--radius-md);
}

.page-about .about-metric-num {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 4.6vw, 2.4rem);
  line-height: 1;
  color: var(--gold-soft);
}

.page-about .about-metric-label {
  font-size: 0.8rem;
  line-height: 1.55;
  color: var(--slate);
  letter-spacing: 0.03em;
}

.page-about .about-metric-scale {
  display: block;
  height: 8px;
  margin-top: 4px;
  border-radius: 2px;
  background-image: repeating-linear-gradient(
    90deg,
    rgba(232, 180, 90, 0.65) 0,
    rgba(232, 180, 90, 0.65) 1px,
    transparent 1px,
    transparent 8px
  );
  opacity: 0.75;
}

.page-about .about-reach-note {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 16px 18px;
  border-left: 2px solid var(--line-cyan);
  background: rgba(45, 226, 230, 0.07);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-size: 0.9rem;
}

/* ---------- 合作与认可 ---------- */
.page-about .about-eco-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 42px);
  align-items: center;
}

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

.page-about .about-eco-list li {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 18px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  background: linear-gradient(100deg, rgba(139, 92, 246, 0.16), rgba(19, 44, 86, 0.55));
}

.page-about .about-eco-num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2rem);
  line-height: 1;
  color: var(--mist);
}

.page-about .about-eco-label {
  font-size: 0.88rem;
  color: var(--slate);
  line-height: 1.5;
}

.page-about .about-eco-copy .btn {
  margin-top: 10px;
}

/* ---------- 旧版资料 ---------- */
.page-about .about-archive-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 42px);
}

.page-about .about-archive-copy .btn {
  margin-top: 8px;
}

.page-about .about-archive-axes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  counter-reset: axis;
}

.page-about .about-archive-axes li {
  position: relative;
  padding: 18px 18px 16px 54px;
  background: rgba(19, 44, 86, 0.6);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-md);
  counter-increment: axis;
}

.page-about .about-archive-axes li::before {
  content: counter(axis, decimal-leading-zero);
  position: absolute;
  left: 16px;
  top: 18px;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--gold);
}

.page-about .about-archive-axes h3 {
  font-size: 1rem;
  margin-bottom: 6px;
}

.page-about .about-archive-axes p {
  margin: 0;
  font-size: 0.88rem;
}

/* ---------- 下一步 ---------- */
.page-about .about-next-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(18px, 3vw, 28px);
}

.page-about .about-next-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  padding: 20px;
  text-decoration: none;
  color: var(--mist);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.page-about .about-next-card:hover,
.page-about .about-next-card:focus-visible {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lift);
  outline: none;
}

.page-about .about-next-card strong {
  font-family: var(--font-display);
  font-size: 1.02rem;
  color: var(--mist);
  line-height: 1.4;
}

.page-about .about-next-card span:last-child {
  font-size: 0.86rem;
  color: var(--slate);
  line-height: 1.7;
}

.page-about .about-backtop {
  margin: clamp(24px, 4vw, 36px) 0 0;
  text-align: right;
}

.page-about .about-backtop a {
  display: inline-block;
  padding: 8px 4px;
  color: var(--slate);
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-decoration: none;
  border-bottom: 1px solid var(--line-soft);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-backtop a:hover,
.page-about .about-backtop a:focus-visible {
  color: var(--gold-soft);
  border-bottom-color: var(--gold);
  outline: none;
}

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

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

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

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

@media (min-width: 900px) {
  .page-about .about-origin-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(32px, 4vw, 56px);
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

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

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

  .page-about .about-archive-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }
}

@media (min-width: 980px) {
  .page-about .about-timeline-grid {
    grid-template-columns: 236px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 48px);
  }

  .page-about .about-index {
    position: sticky;
    top: 96px;
    padding: 18px 16px;
  }

  .page-about .about-index-list {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team-card,
  .page-about .about-next-card,
  .page-about .about-node details,
  .page-about .about-index-list a {
    transition: none;
  }

  .page-about .about-team-card:hover,
  .page-about .about-team-card:focus-within,
  .page-about .about-next-card:hover,
  .page-about .about-next-card:focus-visible {
    transform: none;
  }
}