.page-about {
  --about-line: var(--line);
  --about-idx-w: 88px;
  --about-soft: rgba(50, 230, 208, .12);
  background: var(--void);
  color: var(--ink);
  padding-bottom: 0;
}

.page-about .about-hero {
  padding: calc(var(--header-h) + 44px) 0 clamp(48px, 6vw, 88px);
  background:
    radial-gradient(900px 460px at 82% 4%, rgba(50, 230, 208, .10), transparent 62%),
    radial-gradient(720px 420px at 6% 0%, rgba(76, 141, 255, .10), transparent 66%);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(24px, 3vw, 40px);
  font-size: 12px;
}

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  grid-template-columns: 1fr;
}

.page-about .about-hero-lead h1 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.06;
  font-size: clamp(30px, 7vw, 56px);
  margin: 12px 0 20px;
  text-wrap: balance;
}

.page-about .about-hero-lead .lead {
  max-width: 62ch;
  color: var(--fog);
  line-height: 1.8;
}

.page-about .about-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 28px;
  margin-top: clamp(26px, 4vw, 40px);
  padding-top: 22px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 108px;
}

.page-about .about-stat-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 30px;
  font-weight: 600;
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -.02em;
}

.page-about .about-stat-unit {
  font-size: 14px;
  margin-left: 2px;
  color: var(--ink-dim);
}

.page-about .about-stat-label {
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--ink-dim);
}

.page-about .about-hero-figure {
  margin: 0;
}

.page-about .about-hero-figure .frame,
.page-about .timeline-figure .frame,
.page-about .team-figure .frame {
  overflow: hidden;
}

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

.page-about .frame-caption {
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--ink-dim);
}

.page-about .about-section {
  padding: clamp(52px, 7vw, 96px) 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-section--timeline {
  background: linear-gradient(180deg, rgba(13, 21, 38, .75), rgba(7, 11, 20, 0));
}

.page-about .about-sec-head {
  max-width: 760px;
  margin-bottom: clamp(32px, 5vw, 56px);
}

.page-about .about-sec-lead {
  margin-top: 16px;
  color: var(--fog);
  line-height: 1.8;
  font-size: 15px;
}

/* 起点 */
.page-about .origin-grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  grid-template-columns: 1fr;
}

.page-about .origin-text h2 {
  margin: 10px 0 20px;
}

.page-about .origin-text .prose + .prose {
  margin-top: 16px;
}

.page-about .origin-text .prose {
  color: var(--fog);
  line-height: 1.85;
  max-width: 66ch;
}

.page-about .origin-aside .panel {
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: var(--radius);
  box-shadow: var(--shadow-panel);
}

.page-about .origin-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .origin-list li {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 10px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--fog);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .origin-list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .origin-num {
  font-size: 12px;
  color: var(--cyan);
  padding-top: 2px;
}

/* 时间轴 */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  position: relative;
}

.page-about .tl-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 0 0 34px 22px;
  border-left: 1px solid var(--line);
  position: relative;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 8px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(50, 230, 208, .14);
  transition: transform .22s var(--ease), box-shadow .22s var(--ease);
}

.page-about .tl-item:hover::before,
.page-about .tl-item:focus-within::before {
  transform: scale(1.35);
  box-shadow: 0 0 0 7px rgba(50, 230, 208, .18);
}

.page-about .tl-index {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}

.page-about .tl-num {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -.02em;
}

.page-about .tl-stage {
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--cyan);
  border: 1px solid rgba(50, 230, 208, .32);
  border-radius: 2px;
  padding: 2px 7px;
}

.page-about .tl-title {
  font-family: var(--font-display);
  font-size: clamp(19px, 3.4vw, 25px);
  font-weight: 700;
  line-height: 1.3;
  margin: 6px 0 10px;
  letter-spacing: -.01em;
}

.page-about .tl-body p {
  margin: 0;
  color: var(--fog);
  font-size: 14.5px;
  line-height: 1.85;
  max-width: 68ch;
}

.page-about .tl-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.page-about .timeline-figure {
  margin: clamp(34px, 5vw, 56px) 0 0;
}

/* 覆盖带 */
.page-about .about-section--cover {
  background:
    linear-gradient(120deg, rgba(76, 141, 255, .09), rgba(50, 230, 208, .05) 48%, rgba(255, 90, 60, .06));
}

.page-about .cover-grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  grid-template-columns: 1fr;
  align-items: end;
}

.page-about .cover-intro h2 {
  margin: 10px 0 20px;
}

.page-about .cover-intro .prose {
  color: var(--fog);
  line-height: 1.85;
  max-width: 62ch;
}

.page-about .cover-intro .prose + .prose {
  margin-top: 16px;
}

.page-about .cover-visual svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .cover-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  margin-top: clamp(32px, 5vw, 52px);
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .cover-stat {
  background: var(--panel);
  padding: 20px 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .cover-stat-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 26px;
  font-weight: 600;
  line-height: 1;
  color: var(--ink);
  letter-spacing: -.02em;
}

.page-about .cover-stat:nth-child(2n) .cover-stat-num {
  color: var(--cyan);
}

.page-about .cover-stat-label {
  font-size: 12px;
  color: var(--ink-dim);
  letter-spacing: .03em;
}

/* 团队 */
.page-about .team-grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  grid-template-columns: 1fr;
}

.page-about .team-cards {
  display: grid;
  gap: 14px;
}

.page-about .team-card {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(13, 21, 38, .72);
  padding: 20px 20px 20px 60px;
  transition: border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .team-card:hover {
  border-color: rgba(50, 230, 208, .4);
  background: rgba(16, 27, 47, .82);
}

.page-about .team-card-num {
  position: absolute;
  left: 18px;
  top: 20px;
  font-size: 18px;
  font-weight: 600;
  color: var(--cyan);
  letter-spacing: -.02em;
}

.page-about .team-card-title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 8px;
  letter-spacing: .01em;
}

.page-about .team-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--fog);
}

.page-about .team-figure {
  margin: 0;
}

/* 方法 */
.page-about .method-grid {
  display: grid;
  gap: clamp(28px, 4vw, 52px);
  grid-template-columns: 1fr;
}

.page-about .method-intro h2 {
  margin: 10px 0 20px;
}

.page-about .method-intro .prose {
  color: var(--fog);
  line-height: 1.85;
  max-width: 52ch;
}

.page-about .method-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .method-item {
  background: var(--void);
  padding: 18px 4px;
}

.page-about .method-step {
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--flame);
}

.page-about .method-title {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  margin: 6px 0 6px;
}

.page-about .method-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-dim);
}

/* 荣誉 */
.page-about .about-section--award {
  background: linear-gradient(180deg, rgba(255, 90, 60, .05), transparent 70%);
}

.page-about .award-panel {
  display: grid;
  gap: 18px;
  grid-template-columns: 1fr;
  border: 1px solid var(--line);
  border-left: 2px solid var(--flame);
  border-radius: var(--radius);
  background: var(--panel);
  padding: clamp(22px, 4vw, 40px);
}

.page-about .award-mark {
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--flame);
}

.page-about .award-body h2 {
  margin: 0 0 14px;
  font-size: clamp(22px, 4vw, 32px);
}

.page-about .award-body .prose {
  color: var(--fog);
  line-height: 1.85;
  max-width: 74ch;
}

.page-about .award-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* 收尾 */
.page-about .about-section--cta {
  border-bottom: 0;
}

.page-about .about-cta {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  grid-template-columns: 1fr;
}

.page-about .about-cta-text h2 {
  margin: 0 0 16px;
  font-size: clamp(24px, 4.4vw, 36px);
}

.page-about .about-cta-text .prose {
  color: var(--fog);
  line-height: 1.85;
  max-width: 56ch;
}

.page-about .about-cta-links {
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-cta-link {
  display: grid;
  grid-template-columns: 34px 1fr;
  grid-template-areas:
    "idx name"
    "idx desc";
  gap: 2px 8px;
  padding: 16px 18px;
  background: var(--panel);
  text-decoration: none;
  color: var(--ink);
  transition: background-color .2s var(--ease);
}

.page-about .about-cta-link:hover,
.page-about .about-cta-link:focus-visible {
  background: var(--panel-hi);
}

.page-about .about-cta-idx {
  grid-area: idx;
  font-size: 12px;
  color: var(--cyan);
  padding-top: 3px;
}

.page-about .about-cta-name {
  grid-area: name;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .01em;
}

.page-about .about-cta-desc {
  grid-area: desc;
  font-size: 12.5px;
  color: var(--ink-dim);
  line-height: 1.6;
}

@media (min-width: 640px) {
  .page-about .cover-stats {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .about-cta-link {
    grid-template-columns: 40px 1fr;
    padding: 18px 22px;
  }
}

@media (min-width: 860px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .origin-grid {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .tl-item {
    grid-template-columns: var(--about-idx-w) minmax(0, 1fr);
    gap: 0 28px;
    padding-left: 30px;
  }

  .page-about .tl-index {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    align-self: start;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .page-about .tl-num {
    font-size: 26px;
  }

  .page-about .tl-body {
    padding-bottom: 4px;
  }

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

  .page-about .cover-stats {
    grid-template-columns: repeat(5, 1fr);
  }

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

  .page-about .method-grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: clamp(32px, 5vw, 72px);
  }

  .page-about .method-item {
    padding: 20px 22px;
  }

  .page-about .award-panel {
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 28px;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    align-items: start;
  }
}

@media (min-width: 1100px) {
  .page-about .timeline {
    padding-left: 8px;
  }

  .page-about .tl-item {
    padding-bottom: 44px;
  }

  .page-about .timeline-figure {
    margin-left: calc(var(--about-idx-w) + 58px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-item::before,
  .page-about .team-card,
  .page-about .about-cta-link {
    transition: none;
  }

  .page-about .tl-item:hover::before,
  .page-about .tl-item:focus-within::before {
    transform: none;
  }
}