.page-about {
  --about-gap: clamp(18px, 4vw, 44px);
  --about-rule: 1px solid var(--line);
  --about-soft: rgba(145, 166, 186, .78);
  color: var(--paper);
  overflow-x: hidden;
}

.page-about h2 {
  font-family: var(--cn);
  font-weight: 800;
  font-size: clamp(26px, 4.2vw, 42px);
  line-height: 1.18;
  letter-spacing: -.01em;
  margin: 0 0 14px;
}

.page-about h3 {
  font-family: var(--cn);
  font-weight: 700;
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.4;
  margin: 0 0 10px;
}

.page-about p {
  margin: 0 0 14px;
  line-height: 1.78;
  font-size: clamp(15px, 1.1vw, 17px);
  color: rgba(245, 241, 232, .84);
}

.page-about .lede {
  font-size: clamp(15px, 1.15vw, 18px);
  color: var(--about-soft);
  max-width: 62ch;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  margin-bottom: clamp(20px, 4vw, 36px);
}
.page-about .about-crumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--steel);
}
.page-about .about-crumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}
.page-about .about-crumb a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}
.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  border-bottom-color: var(--cyan);
}
.page-about .about-crumb [aria-current="page"] {
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 6vw, 64px) 0 clamp(38px, 7vw, 86px);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -18%;
  right: -22%;
  width: min(760px, 90vw);
  height: min(760px, 90vw);
  background: radial-gradient(circle at 52% 46%, rgba(57, 230, 223, .16), rgba(38, 38, 92, .12) 46%, transparent 68%);
  pointer-events: none;
  animation: about-breathe 7.5s var(--ease) infinite alternate;
}
@keyframes about-breathe {
  from { opacity: .68; transform: scale(.96); }
  to { opacity: 1; transform: scale(1.03); }
}

.page-about .hero-grid {
  display: grid;
  gap: clamp(26px, 5vw, 52px);
  position: relative;
}
.page-about .hero-copy .eyebrow {
  margin-bottom: 14px;
}
.page-about .hero-h1 {
  font-family: var(--cn);
  font-weight: 800;
  font-size: clamp(34px, 7.4vw, 76px);
  line-height: 1.05;
  letter-spacing: -.025em;
  margin: 0 0 clamp(16px, 2.4vw, 26px);
  color: var(--paper);
}
.page-about .hero-lede {
  font-size: clamp(15px, 1.2vw, 18px);
  line-height: 1.8;
  color: rgba(245, 241, 232, .86);
  max-width: 50ch;
  margin-bottom: clamp(22px, 3.4vw, 34px);
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: 0;
  padding-top: 18px;
  border-top: var(--about-rule);
}
.page-about .stat dt {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--steel);
  margin-bottom: 8px;
}
.page-about .stat dd {
  font-family: var(--mono);
  font-weight: 300;
  font-size: clamp(20px, 3.4vw, 30px);
  line-height: 1;
  color: var(--paper);
  margin: 0;
}

.page-about .hero-visual {
  position: relative;
  margin: 0;
}
.page-about .hero-visual img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-card);
  object-fit: cover;
  aspect-ratio: 16 / 9;
}
.page-about .hero-visual::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 34px;
  width: 64px;
  height: 2px;
  background: linear-gradient(90deg, var(--signal), transparent);
}
.page-about .media-caption {
  display: block;
  margin-top: 12px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--steel);
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  padding: clamp(38px, 6.6vw, 84px) 0;
  border-top: var(--about-rule);
}
.page-about .origin-grid {
  display: grid;
  gap: clamp(20px, 4vw, 40px);
}
.page-about .origin-head .eyebrow {
  margin-bottom: 12px;
}
.page-about .origin-note {
  border-left: 2px solid var(--signal);
  padding-left: 16px;
}
.page-about .origin-note .index-num {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--signal);
  display: block;
  margin: 0 0 10px;
}
.page-about .origin-note p:last-child {
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-soft);
  margin: 0;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  padding: clamp(44px, 7vw, 96px) 0;
  background: linear-gradient(180deg, rgba(11, 47, 50, .82), rgba(8, 19, 33, .96));
  border-top: var(--about-rule);
  border-bottom: var(--about-rule);
  overflow: hidden;
}
.page-about .tl-backdrop {
  position: absolute;
  inset: 0;
  opacity: .16;
  pointer-events: none;
}
.page-about .tl-backdrop img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.page-about .about-timeline .wrap {
  position: relative;
}
.page-about .timeline-head {
  margin-bottom: clamp(28px, 5vw, 52px);
}
.page-about .timeline-head .eyebrow {
  margin-bottom: 12px;
}

.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .timeline::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 60px;
  width: 1px;
  background: linear-gradient(180deg, rgba(57, 230, 223, .62), rgba(57, 230, 223, .05));
}
.page-about .tl-item {
  position: relative;
  display: grid;
  grid-template-columns: 50px minmax(0, 1fr);
  gap: 20px;
  padding-bottom: clamp(24px, 4.6vw, 44px);
}
.page-about .tl-item:last-child {
  padding-bottom: 0;
}
.page-about .tl-index {
  font-family: var(--mono);
  font-weight: 300;
  font-size: clamp(28px, 5vw, 40px);
  line-height: 1;
  letter-spacing: -.05em;
  color: rgba(245, 241, 232, .28);
  text-align: right;
  padding-top: 2px;
}
.page-about .tl-dot {
  position: absolute;
  top: 12px;
  left: 60px;
  width: 9px;
  height: 9px;
  margin-left: -4px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(57, 230, 223, .14), 0 0 16px rgba(57, 230, 223, .68);
}
.page-about .tl-era {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--mint);
  margin: 0 0 8px;
}
.page-about .tl-body p {
  max-width: 60ch;
}
.page-about .tl-more {
  margin-top: 6px;
  border-top: 1px solid rgba(29, 58, 82, .8);
  padding-top: 10px;
}
.page-about .tl-more summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--cyan);
  padding: 4px 0;
}
.page-about .tl-more summary::-webkit-details-marker {
  display: none;
}
.page-about .tl-more summary::before {
  content: "+ ";
}
.page-about .tl-more[open] summary::before {
  content: "− ";
}
.page-about .tl-more summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}
.page-about .tl-more p {
  font-size: 14px;
  color: var(--about-soft);
  margin: 8px 0 0;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: clamp(40px, 6.8vw, 88px) 0;
}
.page-about .team-grid {
  display: grid;
  gap: clamp(26px, 4.6vw, 56px);
}
.page-about .team-copy .eyebrow {
  margin-bottom: 12px;
}
.page-about .team-list {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .team-list li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(29, 58, 82, .7);
  font-size: 14px;
  color: rgba(245, 241, 232, .82);
}
.page-about .team-list .mono {
  font-family: var(--mono);
  font-weight: 300;
  font-size: 20px;
  color: var(--cyan);
  min-width: 34px;
}

.page-about .team-tree {
  margin: 0 0 18px;
  padding: clamp(14px, 2.4vw, 22px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(150deg, rgba(38, 38, 92, .38), rgba(8, 19, 33, .1));
  box-shadow: var(--shadow-card);
}
.page-about .team-tree svg {
  display: block;
  width: 100%;
  max-width: 540px;
  height: auto;
  overflow: visible;
}
.page-about .tt-trunk {
  stroke: var(--line);
  stroke-width: 1.5;
  fill: none;
}
.page-about .tt-branch {
  stroke: rgba(57, 230, 223, .55);
  stroke-width: 1.2;
  fill: none;
}
.page-about .tt-node {
  fill: var(--signal);
}
.page-about .tt-tip {
  fill: var(--cyan);
}
.page-about .tt-label {
  font-family: var(--cn);
  font-size: 16px;
  font-weight: 700;
  fill: var(--paper);
}
.page-about .tt-sub {
  font-family: var(--cn);
  font-size: 12px;
  fill: #91A6BA;
}
.page-about .tt-root {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .06em;
  fill: rgba(123, 224, 181, .9);
}
.page-about .team-tree figcaption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--steel);
}

.page-about .team-photo {
  margin: 0;
}
.page-about .team-photo img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
}

/* ---------- 资料库 ---------- */
.page-about .about-library {
  padding: clamp(40px, 6.8vw, 88px) 0;
  background: linear-gradient(160deg, rgba(38, 38, 92, .42), rgba(8, 19, 33, .9));
  border-top: var(--about-rule);
  border-bottom: var(--about-rule);
}
.page-about .library-head {
  margin-bottom: clamp(24px, 3.6vw, 40px);
}
.page-about .library-head .eyebrow {
  margin-bottom: 12px;
}
.page-about .lib-figures {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: 18px;
}
.page-about .lib-figure {
  padding: clamp(16px, 2.4vw, 24px);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(8, 19, 33, .5);
}
.page-about .lib-num {
  font-family: var(--mono);
  font-weight: 300;
  font-size: clamp(38px, 7vw, 62px);
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--cyan);
  margin: 0 0 8px;
}
.page-about .lib-label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--paper);
  margin: 0 0 10px;
}
.page-about .lib-desc {
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-soft);
  margin: 0;
}
.page-about .library-tail {
  font-size: 14px;
  color: var(--about-soft);
  margin: 0;
}
.page-about .library-tail a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(57, 230, 223, .4);
}
.page-about .library-tail a:hover,
.page-about .library-tail a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 合作与质量 ---------- */
.page-about .about-partners {
  padding: clamp(40px, 6.8vw, 88px) 0;
}
.page-about .partners-head {
  margin-bottom: clamp(24px, 3.6vw, 40px);
}
.page-about .partners-head .eyebrow {
  margin-bottom: 12px;
}
.page-about .quality-steps {
  list-style: none;
  margin: 0 0 clamp(22px, 3.4vw, 34px);
  padding: 0;
  display: grid;
  gap: 14px;
  counter-reset: step;
}
.page-about .quality-steps li {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(14, 32, 56, .52);
  box-shadow: var(--shadow-card);
}
.page-about .quality-steps .index-num {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--signal);
  display: block;
  margin: 0 0 8px;
}
.page-about .quality-steps p:last-child {
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-soft);
  margin: 0;
}
.page-about .partner-notes {
  display: grid;
  gap: 0;
  border-left: 1px solid var(--line);
  padding-left: clamp(16px, 3vw, 26px);
}
.page-about .partner-notes p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-soft);
  margin: 0 0 10px;
}
.page-about .partner-notes p:last-child {
  margin-bottom: 0;
}

/* ---------- 荣誉 ---------- */
.page-about .about-honor {
  padding: clamp(40px, 6.8vw, 88px) 0;
  background: linear-gradient(140deg, rgba(90, 31, 61, .82), rgba(38, 38, 92, .34) 62%, rgba(8, 19, 33, .92));
  border-top: var(--about-rule);
}
.page-about .honor-grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}
.page-about .honor-card {
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid rgba(245, 241, 232, .16);
  border-radius: var(--radius);
  background: rgba(8, 19, 33, .42);
  box-shadow: var(--shadow-card);
}
.page-about .honor-card .eyebrow {
  margin-bottom: 12px;
  color: var(--mint);
}
.page-about .honor-card h2 {
  font-size: clamp(22px, 3.4vw, 32px);
}
.page-about .honor-card p:last-child {
  margin: 0;
  color: rgba(245, 241, 232, .8);
}
.page-about .honor-next h3 {
  margin-bottom: 14px;
}
.page-about .honor-next ul {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .honor-next li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(245, 241, 232, .82);
}
.page-about .honor-next li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--signal);
}
.page-about .honor-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 尾段 ---------- */
.page-about .about-cta {
  padding: clamp(36px, 6vw, 72px) 0 clamp(44px, 7vw, 88px);
}
.page-about .cta-inner {
  display: grid;
  gap: clamp(18px, 3vw, 32px);
  align-items: center;
  padding: clamp(20px, 3.4vw, 34px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(120deg, rgba(11, 47, 50, .7), rgba(8, 19, 33, .5));
  box-shadow: var(--shadow-island);
}
.page-about .cta-inner h2 {
  font-size: clamp(22px, 3.4vw, 34px);
  margin-bottom: 10px;
}
.page-about .cta-inner p {
  margin: 0;
  font-size: 14px;
  color: var(--about-soft);
  max-width: 56ch;
}
.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .lib-figures {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .quality-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .origin-note {
    max-width: 340px;
  }
}

@media (min-width: 900px) {
  .page-about .hero-grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
    align-items: start;
  }
  .page-about .hero-visual {
    transform: translateY(26px);
  }
  .page-about .hero-visual::before {
    content: "";
    position: absolute;
    inset: -14px -14px auto auto;
    width: 120px;
    height: 120px;
    border-top: 1px solid rgba(57, 230, 223, .5);
    border-right: 1px solid rgba(57, 230, 223, .5);
    border-radius: 0 var(--radius) 0 0;
    pointer-events: none;
  }

  .page-about .origin-grid {
    grid-template-columns: minmax(0, 260px) minmax(0, 1fr) minmax(0, 250px);
    align-items: start;
  }
  .page-about .origin-head h2 {
    font-size: clamp(26px, 2.6vw, 34px);
  }

  .page-about .timeline::before {
    left: 113px;
  }
  .page-about .tl-item {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 34px;
  }
  .page-about .tl-dot {
    left: 113px;
  }
  .page-about .tl-index {
    font-size: 46px;
  }
  .page-about .about-timeline .wrap {
    display: grid;
    grid-template-columns: minmax(0, 300px) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }
  .page-about .timeline-head {
    position: sticky;
    top: 96px;
    margin-bottom: 0;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, .92fr);
    align-items: start;
  }
  .page-about .team-copy {
    padding-top: 8px;
  }

  .page-about .honor-grid {
    grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
    align-items: start;
  }

  .page-about .cta-inner {
    grid-template-columns: minmax(0, 1fr) auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero::before {
    animation: none;
  }
}
</main>