.page-about {
  --about-rail: 92px;
  --about-space: clamp(46px, 7vw, 100px);
  --about-hair: 2px;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--night);
  color: var(--cream);
  padding: clamp(30px, 5vw, 56px) 0 clamp(42px, 6.5vw, 86px);
  border-bottom: var(--about-hair) solid var(--edge);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -14%;
  top: -20%;
  width: min(62vw, 700px);
  aspect-ratio: 1 / 1;
  background: linear-gradient(150deg, rgba(53, 225, 208, 0.22), rgba(255, 122, 47, 0.13) 48%, transparent 74%);
  clip-path: polygon(14% 0, 100% 7%, 87% 73%, 41% 100%, 0 67%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .about-hero__crumbs {
  margin: 0 0 4px;
}

.page-about .about-hero__rail {
  display: none;
}

.page-about .about-hero__body h1 {
  margin: 10px 0 0;
  font-size: clamp(34px, 7.4vw, 76px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--cream);
  max-width: 15ch;
}

.page-about .about-hero .lede {
  margin: 20px 0 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.55vw, 18px);
  line-height: 1.82;
  color: rgba(244, 239, 227, 0.82);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--about-hair);
  background: var(--edge);
  border: var(--about-hair) solid var(--edge);
}

.page-about .about-hero__facts li {
  background: var(--night-deep);
  padding: 18px 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-num {
  font-family: var(--font-num);
  font-size: clamp(26px, 3.4vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .about-hero__facts li > span:last-child {
  font-size: 13px;
  line-height: 1.5;
  color: var(--note);
}

/* ============ 章节骨架 ============ */
.page-about .about-chapter {
  padding: var(--about-space) 0;
  border-bottom: var(--about-hair) solid var(--edge);
}

.page-about .about-chapter--night {
  background: var(--night);
  color: var(--cream);
}

.page-about .about-chapter--paper {
  background: var(--cream);
  color: var(--ink);
  border-bottom-color: rgba(35, 32, 28, 0.22);
}

.page-about .about-chapter--close {
  background: var(--night-deep);
  color: var(--cream);
  border-bottom: 0;
}

.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.6vw, 30px);
}

.page-about .about-chapter__rail {
  display: none;
}

.page-about .about-chapter__body h2 {
  margin: 0 0 22px;
  font-size: clamp(26px, 4.2vw, 46px);
  line-height: 1.14;
  letter-spacing: -0.018em;
  font-weight: 900;
  max-width: 21ch;
}

.page-about .about-chapter__body > p {
  margin: 0 0 18px;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  max-width: 68ch;
}

.page-about .about-chapter--night .about-chapter__body > p,
.page-about .about-chapter--close .about-chapter__body > p {
  color: rgba(244, 239, 227, 0.82);
}

.page-about .about-chapter--paper .about-chapter__body a {
  color: var(--press);
}

.page-about .about-inline-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ============ 图片 ============ */
.page-about .about-figure {
  margin: 30px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: var(--about-hair) solid var(--edge);
  background: var(--night-deep);
}

.page-about .about-chapter--paper .about-figure img {
  border-color: var(--ink);
}

.page-about .about-figure .figure__cap {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--note);
}

.page-about .about-chapter--paper .about-figure .figure__cap {
  color: rgba(35, 32, 28, 0.6);
}

/* ============ 时间轴 ============ */
.page-about .about-timeline {
  margin-top: 28px;
  overflow-x: auto;
  overflow-y: hidden;
  cursor: grab;
  padding-bottom: 16px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--cyan) transparent;
}

.page-about .about-timeline[data-dragging="true"] {
  cursor: grabbing;
  user-select: none;
}

.page-about .about-timeline__track {
  display: flex;
  align-items: stretch;
  gap: clamp(20px, 3.4vw, 52px);
  min-width: max-content;
  list-style: none;
  margin: 0;
  padding: 6px 2px 10px;
}

.page-about .about-node {
  flex: 0 0 auto;
  width: clamp(200px, 24vw, 252px);
  border-top: 4px solid var(--cyan);
  padding-top: 18px;
}

.page-about .about-node:nth-child(2) {
  width: clamp(232px, 28vw, 318px);
  border-top-color: var(--gold);
  margin-top: 22px;
}

.page-about .about-node:nth-child(3) {
  width: clamp(212px, 25vw, 276px);
  border-top-color: var(--orange);
  margin-top: 8px;
}

.page-about .about-node:nth-child(4) {
  width: clamp(244px, 29vw, 340px);
  border-top-color: var(--press);
  margin-top: 30px;
}

.page-about .about-node__idx {
  display: block;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--note);
}

.page-about .about-node__title {
  margin: 10px 0 4px;
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.page-about .about-node__year {
  margin: 0 0 10px;
  font-family: var(--font-num);
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .about-node__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(244, 239, 227, 0.76);
  max-width: 34ch;
}

/* ============ 团队名单 ============ */
.page-about .about-team__list {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  border: var(--about-hair) solid var(--ink);
}

.page-about .about-team__item {
  grid-column: span 12;
  padding: 20px 18px 22px;
  border-bottom: var(--about-hair) solid var(--ink);
  box-shadow: inset calc(var(--about-hair) * -1) 0 0 var(--ink);
  transition: background-color 0.22s ease, transform 0.22s ease;
}

.page-about .about-team__item:last-child {
  border-bottom: 0;
}

.page-about .about-team__item:hover,
.page-about .about-team__item:focus-within {
  background: rgba(200, 56, 44, 0.08);
}

.page-about .about-team__item h3 {
  margin: 0 0 10px;
  font-size: clamp(17px, 1.8vw, 20px);
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--ink);
  border-bottom: 3px solid var(--press);
  display: inline-block;
  padding-bottom: 4px;
}

.page-about .about-team__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(35, 32, 28, 0.78);
  max-width: 40ch;
}

/* ============ 能力数字 ============ */
.page-about .about-stats {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  border-top: var(--about-hair) solid var(--edge);
}

.page-about .about-stats__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 20px 0 22px;
  border-bottom: var(--about-hair) solid var(--edge);
}

.page-about .about-stats__row dt {
  margin: 0;
}

.page-about .about-stats__row dd {
  margin: 0;
  font-size: clamp(14px, 1.45vw, 16px);
  line-height: 1.8;
  color: rgba(244, 239, 227, 0.8);
  max-width: 58ch;
}

/* ============ 三件事 ============ */
.page-about .about-values {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  border-top: var(--about-hair) solid var(--edge);
}

.page-about .about-values__item {
  padding: 24px 0 26px;
  border-bottom: var(--about-hair) solid var(--edge);
  display: grid;
  gap: 10px;
}

.page-about .about-values__item h3 {
  margin: 0;
  font-size: clamp(19px, 2.2vw, 24px);
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--gold);
}

.page-about .about-values__item p {
  margin: 0;
  font-size: clamp(14px, 1.45vw, 16px);
  line-height: 1.82;
  color: rgba(244, 239, 227, 0.8);
  max-width: 62ch;
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

/* ============ 响应式 ============ */
@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(22px, 3.2vw, 48px);
  }

  .page-about .about-hero__rail {
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding-bottom: 6px;
  }

  .page-about .about-hero__rotate {
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    margin: 0;
    font-family: var(--font-num);
    font-size: 11px;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--cyan);
    white-space: nowrap;
  }

  .page-about .about-chapter__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(24px, 4vw, 64px);
  }

  .page-about .about-chapter__rail {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    padding-top: 8px;
    position: sticky;
    top: 108px;
    align-self: start;
  }

  .page-about .about-chapter__num {
    font-family: var(--font-num);
    font-size: 13px;
    letter-spacing: 0.2em;
    color: var(--note);
  }

  .page-about .about-chapter--paper .about-chapter__num {
    color: rgba(35, 32, 28, 0.45);
  }

  .page-about .about-chapter__label {
    writing-mode: vertical-rl;
    transform: rotate(180deg);
    margin: 0;
    font-size: 12px;
    letter-spacing: 0.28em;
    white-space: nowrap;
    color: var(--note);
  }

  .page-about .about-chapter--paper .about-chapter__label {
    color: var(--press);
  }

  .page-about .about-chapter--night .about-chapter__body h2,
  .page-about .about-chapter--close .about-chapter__body h2 {
    margin-top: -6px;
  }

  .page-about .about-figure--right {
    max-width: 620px;
    margin-left: auto;
  }

  .page-about .about-figure--left {
    max-width: 520px;
  }

  .page-about .about-team__item:nth-child(1) { grid-column: span 5; }
  .page-about .about-team__item:nth-child(2) { grid-column: span 4; }
  .page-about .about-team__item:nth-child(3) { grid-column: span 3; }
  .page-about .about-team__item:nth-child(4) { grid-column: span 4; }
  .page-about .about-team__item:nth-child(5) { grid-column: span 4; }
  .page-about .about-team__item:nth-child(6) { grid-column: span 4; }

  .page-about .about-team__item:nth-child(1),
  .page-about .about-team__item:nth-child(2),
  .page-about .about-team__item:nth-child(4),
  .page-about .about-team__item:nth-child(5) {
    border-bottom: var(--about-hair) solid var(--ink);
  }

  .page-about .about-team__item:nth-child(3),
  .page-about .about-team__item:nth-child(6) {
    box-shadow: none;
  }

  .page-about .about-team__item:nth-child(4),
  .page-about .about-team__item:nth-child(5),
  .page-about .about-team__item:nth-child(6) {
    border-bottom: 0;
  }
}

@media (min-width: 640px) {
  .page-about .about-stats__row {
    grid-template-columns: minmax(150px, 190px) minmax(0, 1fr);
    align-items: baseline;
    gap: 28px;
  }

  .page-about .about-values__item {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 34px;
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__item {
    transition: none;
  }

  .page-about .about-timeline {
    scroll-behavior: auto;
  }
}
<<<END>>>