.page-about {
  --about-rail-w: 220px;
  --about-cream-card: #FBF6EC;
  --about-line: rgba(26, 19, 16, .12);
  --about-body-ink: #3B4653;
  display: block;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 4vw, 44px) 0 clamp(48px, 7vw, 100px);
  background: var(--deep);
  color: var(--cream);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(58% 48% at 80% 10%, rgba(0, 224, 184, .18), transparent 72%),
    radial-gradient(44% 38% at 6% 92%, rgba(255, 107, 74, .15), transparent 74%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 224, 184, .5), transparent);
}

.page-about .about-hero .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumb,
.page-about .about-hero .breadcrumb a {
  color: var(--mist);
  font-size: 13px;
}

.page-about .about-hero .breadcrumb [aria-current="page"] {
  color: var(--cyan);
}

.page-about .about-hero__grid {
  margin-top: clamp(24px, 4vw, 52px);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 4.5vw, 58px);
  align-items: center;
}

.page-about .about-hero__kicker {
  display: inline-block;
  margin: 0 0 16px;
  padding: 5px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--yellow);
  border: 1px solid rgba(255, 209, 102, .38);
  border-radius: 4px;
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(36px, 6.4vw, 74px);
  line-height: 1.04;
  letter-spacing: -.02em;
  color: var(--cream);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 56ch;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.85;
  color: rgba(246, 240, 230, .84);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__figure {
  margin: 0;
  box-shadow: var(--shadow-lift);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

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

.page-about .about-facts {
  list-style: none;
  margin: clamp(36px, 5vw, 68px) 0 0;
  padding: clamp(22px, 3vw, 30px) 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(18px, 3vw, 30px);
  border-top: 1px solid rgba(143, 166, 189, .28);
}

.page-about .about-fact__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 3.8vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .about-fact:nth-child(2) .about-fact__num { color: var(--yellow); }
.page-about .about-fact:nth-child(3) .about-fact__num { color: var(--coral); }
.page-about .about-fact:nth-child(4) .about-fact__num { color: var(--mint); }

.page-about .about-fact__label {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: .02em;
  color: var(--mist);
}

/* ---------- 时间线区 ---------- */

.page-about .about-journey {
  background: var(--cream);
  color: var(--ink);
}

.page-about .about-journey .section-head__title {
  color: var(--ink);
}

.page-about .about-journey .section-head__eyebrow {
  color: var(--clay);
}

.page-about .about-journey .section-head__desc {
  color: #55606E;
}

.page-about .about-journey__grid {
  margin-top: clamp(34px, 5vw, 66px);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 4vw, 50px);
  align-items: start;
}

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

.page-about .about-rail__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 20px;
}

.page-about .about-rail__list::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16px;
  bottom: 16px;
  width: 1px;
  background: linear-gradient(180deg, var(--clay), rgba(196, 75, 54, .12));
}

.page-about .about-rail__item {
  position: relative;
}

.page-about .about-rail__item::before {
  content: "";
  position: absolute;
  left: -23px;
  top: 16px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cream);
  box-shadow: 0 0 0 2px var(--clay);
}

.page-about .about-rail__link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 12px;
  border-radius: 8px;
  text-decoration: none;
  color: #4A5A6B;
  transition: background .25s var(--ease), color .25s var(--ease), transform .25s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  background: var(--mint);
  color: var(--ink);
  transform: translateX(4px);
}

.page-about .about-rail__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--clay);
}

.page-about .about-rail__label {
  font-size: 14px;
  font-weight: 500;
}

.page-about .about-stream {
  display: grid;
  gap: clamp(22px, 3.2vw, 36px);
}

.page-about .about-node {
  position: relative;
  padding: clamp(24px, 3.6vw, 42px);
  background: var(--about-cream-card);
  border: 1px solid var(--about-line);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
  transition: transform .35s var(--ease), box-shadow .35s var(--ease);
}

.page-about .about-node:hover {
  transform: translateY(-3px);
  box-shadow: 0 22px 48px -34px rgba(26, 19, 16, .8);
}

.page-about .about-node__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px 18px;
  margin-bottom: 18px;
}

.page-about .about-node__year {
  display: inline-block;
  padding: 5px 13px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--clay);
  background: rgba(196, 75, 54, .1);
  border-radius: 4px;
  transform: skewX(-8deg);
}

.page-about .about-node__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 2.9vw, 33px);
  line-height: 1.22;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .about-node__body p {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.86;
  color: var(--about-body-ink);
}

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

.page-about .about-node__list {
  list-style: none;
  margin: 18px 0 18px;
  padding: 0;
}

.page-about .about-node__list li {
  position: relative;
  margin-bottom: 9px;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-body-ink);
}

.page-about .about-node__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 11px;
  height: 2px;
  background: var(--clay);
}

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

.page-about .about-node__media {
  margin: 24px 0 0;
}

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

.page-about .about-node--dark {
  background: linear-gradient(152deg, var(--night), var(--deep) 88%);
  border-color: transparent;
}

.page-about .about-node--dark .about-node__title {
  color: var(--cream);
}

.page-about .about-node--dark .about-node__year {
  color: var(--cyan);
  background: rgba(0, 224, 184, .14);
}

.page-about .about-node--dark .about-node__body p {
  color: rgba(246, 240, 230, .84);
}

/* ---------- 收尾导航 ---------- */

.page-about .about-next {
  position: relative;
  background: var(--night);
  color: var(--cream);
  overflow: hidden;
}

.page-about .about-next::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(118deg, rgba(0, 224, 184, .14), transparent 58%);
  pointer-events: none;
}

.page-about .about-next__inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 58px);
  align-items: start;
}

.page-about .about-next__intro h2 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 3.4vw, 40px);
  line-height: 1.2;
  letter-spacing: -.015em;
  color: var(--cream);
}

.page-about .about-next__intro p {
  margin: 0;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.82;
  color: rgba(246, 240, 230, .78);
}

.page-about .about-next__links {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .about-next__link {
  display: block;
  padding: 16px 18px;
  border: 1px solid rgba(0, 224, 184, .28);
  border-radius: 10px;
  text-decoration: none;
  color: var(--cream);
  transition: border-color .25s var(--ease), background .25s var(--ease), transform .25s var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-color: var(--cyan);
  background: rgba(0, 224, 184, .09);
  transform: translateY(-3px);
}

.page-about .about-next__link strong {
  display: block;
  margin-bottom: 5px;
  font-size: 16px;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .about-next__link span {
  display: block;
  font-size: 13px;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 响应式 ---------- */

@media (min-width: 620px) {
  .page-about .about-next__links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.15fr .85fr;
  }

  .page-about .about-hero__lead {
    padding-right: clamp(0px, 2vw, 28px);
  }

  .page-about .about-next__inner {
    grid-template-columns: .9fr 1.1fr;
  }
}

@media (min-width: 980px) {
  .page-about .about-journey__grid {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(44px, 6vw, 92px);
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 108px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node,
  .page-about .about-rail__link,
  .page-about .about-next__link {
    transition: none;
  }

  .page-about .about-node:hover,
  .page-about .about-rail__link:hover,
  .page-about .about-next__link:hover {
    transform: none;
  }
}
<<<END>>>