.page-about {
  --about-gutter: clamp(20px, 5vw, 64px);
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 5vw, 62px) 0 clamp(24px, 4vw, 46px);
  background:
    radial-gradient(70% 85% at 8% -10%, rgba(46, 123, 255, 0.18), transparent 66%),
    radial-gradient(55% 75% at 96% 12%, rgba(255, 138, 61, 0.09), transparent 72%);
}

.page-about .about-hero h1 {
  margin: 14px 0 18px;
  font-family: var(--font-display);
  font-size: clamp(1.95rem, 5.6vw, 3.35rem);
  font-weight: 850;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--ink);
  max-width: 19ch;
}

.page-about .about-hero .lede {
  max-width: 62ch;
  font-size: clamp(15.5px, 2.2vw, 17.5px);
  line-height: 1.78;
  color: var(--muted);
}

.page-about .hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 12px;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .hero-stat {
  padding: 4px 0 4px 14px;
  border-left: 2px solid rgba(127, 216, 255, 0.35);
}

.page-about .hero-stat b {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4.4vw, 2.15rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

.page-about .hero-stat span {
  display: block;
  margin-top: 7px;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
}

/* ============ 面板堆叠区 ============ */
.page-about .stack {
  padding-bottom: clamp(44px, 7vw, 88px);
}

.page-about .about-section {
  padding: clamp(22px, 3.6vw, 40px);
}

.page-about .about-section h2 {
  margin: 10px 0 16px;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3.1vw, 2rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--ink);
  max-width: 26ch;
}

.page-about .about-section .lede {
  max-width: 60ch;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--muted);
  margin-bottom: clamp(16px, 2.6vw, 26px);
}

.page-about .about-prose p {
  margin: 0 0 14px;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

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

.page-about .about-prose strong {
  color: var(--ink);
  font-weight: 700;
}

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

/* ============ 段落尾指标行 ============ */
.page-about .metric-line {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 26px;
  margin-top: clamp(20px, 3vw, 30px);
  padding: 3px 0 3px 15px;
  border-left: 2px solid var(--ice);
}

.page-about .metric {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  font-size: 13.5px;
  line-height: 1.5;
  letter-spacing: 0.01em;
  color: var(--muted);
}

.page-about .metric b {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1;
  color: var(--ice);
  font-variant-numeric: tabular-nums;
}

/* ============ 图片 ============ */
.page-about .about-fig {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-organic);
  background: var(--layer);
}

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

.page-about .about-fig figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line-soft);
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--muted);
}

.page-about .about-fig--wide {
  margin-top: clamp(16px, 2.6vw, 26px);
}

.page-about .about-section .about-fig {
  margin-bottom: 16px;
}

/* ============ 团队卡片 ============ */
.page-about .team-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: clamp(24px, 3.6vw, 34px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .team-card {
  padding: 18px 18px 16px;
  border: 1px solid var(--line-soft);
  border-radius: 14px 4px 14px 4px;
  background: linear-gradient(160deg, var(--layer), var(--panel));
  transition: transform 0.26s var(--ease), border-color 0.26s var(--ease), box-shadow 0.26s var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus,
.page-about .team-card:focus-within {
  transform: translateY(-5px);
  border-color: var(--line);
  box-shadow: var(--shadow-panel);
  outline: none;
}

.page-about .team-card h3 {
  margin: 0 0 10px;
  font-size: 15.5px;
  font-weight: 750;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.page-about .team-card__num {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--ice);
}

.page-about .team-card__lead {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
  opacity: 0.86;
}

.page-about .team-card__more {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--muted);
}

@media (min-width: 760px) {
  .page-about .team-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
  .page-about .team-cards > li:nth-child(2n) {
    margin-top: 22px;
  }
}

@media (min-width: 1180px) {
  .page-about .team-cards {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .team-cards > li:nth-child(2n) {
    margin-top: 20px;
  }
  .page-about .team-cards > li:nth-child(3n) {
    margin-top: 34px;
  }
}

/* ============ 版本时间轴 ============ */
.page-about .ver-tl {
  position: relative;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ver-tl__item {
  position: relative;
  padding-left: 36px;
}

.page-about .ver-tl__item + .ver-tl__item {
  margin-top: 14px;
}

.page-about .ver-tl__item::after {
  content: "";
  position: absolute;
  left: 2px;
  top: 21px;
  width: 15px;
  height: 15px;
  box-sizing: border-box;
  border: 2px solid var(--ice);
  border-radius: 50%;
  background: var(--panel);
}

.page-about .ver-tl__item::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 38px;
  bottom: -14px;
  width: 1px;
  background: linear-gradient(180deg, rgba(127, 216, 255, 0.55), rgba(127, 216, 255, 0.05));
}

.page-about .ver-tl__item:last-child::before {
  display: none;
}

.page-about .ver-tl__item:last-child::after {
  border-color: var(--hot);
  box-shadow: 0 0 0 4px var(--hot-glow);
}

.page-about .ver-tl__sum {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 6px 0;
  cursor: pointer;
  list-style: none;
  outline: none;
}

.page-about .ver-tl__sum::-webkit-details-marker {
  display: none;
}

.page-about .ver-tl__sum:focus-visible {
  outline: 2px solid var(--ice);
  outline-offset: 4px;
  border-radius: 6px;
}

.page-about .ver-tl__ver {
  flex: 0 0 auto;
  padding: 3px 8px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: rgba(127, 216, 255, 0.1);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--ice);
}

.page-about .ver-tl__name {
  flex: 1 1 auto;
  font-size: clamp(15px, 2.4vw, 17px);
  font-weight: 700;
  letter-spacing: 0.005em;
  color: var(--ink);
  transition: color 0.18s var(--ease);
}

.page-about .ver-tl__sum:hover .ver-tl__name {
  color: var(--ice);
}

.page-about .ver-tl__plus {
  position: relative;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
}

.page-about .ver-tl__plus::before,
.page-about .ver-tl__plus::after {
  content: "";
  position: absolute;
  background: var(--muted);
  border-radius: 2px;
  transition: transform 0.24s var(--ease), background 0.18s var(--ease);
}

.page-about .ver-tl__plus::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
}

.page-about .ver-tl__plus::after {
  top: 0;
  left: 6px;
  width: 2px;
  height: 14px;
}

.page-about .ver-tl__node[open] .ver-tl__plus::after {
  transform: scaleY(0);
}

.page-about .ver-tl__node[open] .ver-tl__plus::before {
  background: var(--hot);
}

.page-about .ver-tl__body {
  padding: 6px 0 6px;
  max-width: 62ch;
}

.page-about .ver-tl__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--muted);
}

/* ============ 覆盖范围 ============ */
.page-about .cover-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
}

.page-about .cover-figures li {
  padding: 14px 14px 12px;
  border: 1px solid var(--line-soft);
  border-radius: 12px 3px 12px 3px;
  background: var(--layer);
}

.page-about .cover-figures b {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 3.6vw, 1.85rem);
  font-weight: 700;
  line-height: 1;
  color: var(--brand);
  font-variant-numeric: tabular-nums;
}

.page-about .cover-figures li:nth-child(1) b,
.page-about .cover-figures li:nth-child(4) b {
  color: var(--ice);
}

.page-about .cover-figures span {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  letter-spacing: 0.03em;
  color: var(--muted);
}

.page-about .dotmap {
  margin-top: clamp(22px, 3.2vw, 32px);
  padding: clamp(16px, 2.6vw, 26px);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-card);
  background: var(--panel);
}

.page-about .dotmap__svg {
  display: block;
  width: 100%;
  max-width: 540px;
  height: auto;
}

.page-about .dotmap__dots circle {
  fill: var(--ice);
  opacity: 0.45;
}

.page-about .dotmap__dots circle:nth-child(7n) {
  fill: var(--brand);
  opacity: 0.9;
}

.page-about .dotmap__dots circle:nth-last-child(-n + 6) {
  fill: var(--hot);
  opacity: 0.95;
}

.page-about .dotmap__cap {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--muted);
}

/* ============ 联系区 ============ */
.page-about .about-talk__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-contact {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .about-contact li {
  padding: 12px 0 12px 14px;
  border-left: 2px solid var(--line);
}

.page-about .about-contact__label {
  display: block;
  margin-bottom: 6px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ice);
}

.page-about .about-contact__value {
  display: block;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--ink);
  word-break: break-all;
}

.page-about .about-contact__value.num {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
}

/* ============ 桌面增强 ============ */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding-top: clamp(40px, 5vw, 74px);
  }

  .page-about .hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .hero-stat {
    padding-left: 18px;
  }

  .page-about .about-section .about-fig {
    margin-bottom: 0;
  }

  .page-about .about-talk__actions {
    margin-top: 4px;
  }

  .page-about .about-contact {
    margin-top: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-card,
  .page-about .ver-tl__name,
  .page-about .ver-tl__plus::before,
  .page-about .ver-tl__plus::after {
    transition: none;
  }
  .page-about .team-card:hover,
  .page-about .team-card:focus,
  .page-about .team-card:focus-within {
    transform: none;
  }
}
<<<END>>>