.page-about {
  --about-max: var(--shell);
  --about-rule: var(--rule);
  background: var(--sand);
  color: var(--ink);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 5vw, 48px) var(--gutter) clamp(40px, 6vw, 76px);
  background:
    repeating-linear-gradient(90deg, rgba(30, 28, 24, .035) 0 1px, transparent 1px 30px),
    radial-gradient(120% 90% at 6% 0%, rgba(47, 224, 176, .20), transparent 55%),
    linear-gradient(180deg, var(--cream) 0%, var(--sand) 100%);
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-hero__inner {
  position: relative;
  max-width: var(--about-max);
  margin: 0 auto;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  margin-top: clamp(22px, 3.5vw, 40px);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(34px, 8vw, 82px);
  line-height: 1.04;
  font-weight: 900;
  letter-spacing: -.035em;
  color: var(--green-900);
}

.page-about .about-hero__title em {
  font-style: normal;
  padding: 0 .1em;
  background: linear-gradient(180deg, transparent 58%, var(--mint) 58%, var(--mint) 92%, transparent 92%);
}

.page-about .about-hero__lede {
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  max-width: 34em;
  padding-left: 16px;
  border-left: 3px solid var(--mint);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: #3A342C;
}

.page-about .about-hero__note {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin: 22px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.page-about .about-hero__note::before {
  content: "";
  width: 34px;
  height: 1px;
  background: var(--orange);
}

.page-about .about-hero__map-title {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.page-about .about-index {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-index li {
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-index a {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 12px 6px;
  color: var(--green-900);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: background-color .3s var(--ease), padding-left .3s var(--ease);
}

.page-about .about-index a .num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--orange);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  background: var(--mint-100);
  padding-left: 14px;
  outline: none;
}

/* ---------- 章节骨架 ---------- */
.page-about .chapter {
  position: relative;
  padding: clamp(40px, 6.5vw, 88px) var(--gutter);
  border-bottom: 1px solid var(--about-rule);
}

.page-about .chapter--tint {
  background:
    linear-gradient(180deg, rgba(217, 247, 238, .55), rgba(244, 237, 225, 0) 70%),
    var(--sand);
}

.page-about .chapter__inner {
  max-width: var(--about-max);
  margin: 0 auto;
  display: grid;
  gap: clamp(14px, 2.4vw, 30px);
  grid-template-columns: 1fr;
}

.page-about .chapter__rail {
  display: flex;
  align-items: baseline;
  gap: 14px;
}

.page-about .chapter__num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(42px, 7vw, 92px);
  line-height: .88;
  letter-spacing: -.05em;
  color: rgba(20, 90, 69, .30);
}

@supports (-webkit-text-stroke: 1px #000) {
  .page-about .chapter__num {
    color: transparent;
    -webkit-text-stroke: 1.4px rgba(11, 61, 46, .58);
  }
}

.page-about .chapter__tag {
  font-size: 11px;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.page-about .chapter__title {
  margin: 0 0 clamp(14px, 2vw, 22px);
  font-size: clamp(23px, 3.6vw, 40px);
  line-height: 1.24;
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--green-900);
}

.page-about .prose {
  max-width: 36em;
}

.page-about .prose p {
  margin: 0 0 1em;
  font-size: 16px;
  line-height: 1.9;
  color: #332E27;
}

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

.page-about .chapter__figure {
  margin: clamp(22px, 3.4vw, 38px) 0 0;
}

.page-about .chapter__figure--flush {
  margin-top: 0;
}

.page-about .plaque {
  padding: 10px 10px 12px;
  background: var(--cream);
  clip-path: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 0 100%);
  box-shadow: 0 22px 46px -34px rgba(11, 61, 46, .85);
}

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

.page-about .chapter__figure .media-caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* ---------- 方法：双轨 ---------- */
.page-about .split {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
  margin: clamp(22px, 3vw, 34px) 0;
}

.page-about .rails {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .rails li {
  padding: 15px 0;
  border-bottom: 1px dashed var(--about-rule);
}

.page-about .rails__key {
  display: inline-block;
  margin-bottom: 6px;
  padding: 3px 10px;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--green-900);
  background: var(--mint-100);
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 0 100%);
}

.page-about .rails p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: #3A342C;
}

/* ---------- 团队 ---------- */
.page-about .crew {
  list-style: none;
  margin: clamp(22px, 3vw, 34px) 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 2.4vw, 26px);
}

.page-about .crew__item {
  padding: 16px 0 0;
  border-top: 2px solid var(--green-700);
}

.page-about .crew__no {
  display: block;
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--orange);
}

.page-about .crew__name {
  margin: 8px 0 6px;
  font-size: 18px;
  font-weight: 700;
  color: var(--green-900);
}

.page-about .crew__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: #4A443B;
}

/* ---------- 深色章节 ---------- */
.page-about .chapter--dark {
  background:
    radial-gradient(90% 120% at 100% 0%, rgba(47, 224, 176, .22), transparent 62%),
    var(--green-900);
  color: var(--cream);
  border-bottom-color: rgba(252, 248, 241, .18);
}

.page-about .chapter--dark .chapter__num {
  color: rgba(47, 224, 176, .34);
}

@supports (-webkit-text-stroke: 1px #000) {
  .page-about .chapter--dark .chapter__num {
    color: transparent;
    -webkit-text-stroke: 1.4px rgba(47, 224, 176, .62);
  }
}

.page-about .chapter--dark .chapter__tag {
  color: rgba(252, 248, 241, .62);
}

.page-about .chapter--dark .chapter__title {
  color: var(--cream);
}

.page-about .prose--light p {
  color: rgba(252, 248, 241, .84);
}

.page-about .loop {
  display: grid;
  gap: clamp(24px, 3.4vw, 44px);
  margin-top: clamp(26px, 3.6vw, 42px);
}

.page-about .loop__col {
  padding-top: 16px;
  border-top: 1px solid rgba(47, 224, 176, .38);
}

.page-about .loop__title {
  margin: 0 0 12px;
  font-size: 17px;
  font-weight: 700;
  color: var(--mint);
}

.page-about .chips {
  list-style: none;
  margin: 0 0 14px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .chips li {
  padding: 7px 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--green-900);
  background: var(--mint-100);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
}

.page-about .loop__note {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(252, 248, 241, .8);
}

.page-about .loop__note--mono {
  margin-bottom: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--amber);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline-filter {
  margin: clamp(22px, 3vw, 32px) 0 0;
}

.page-about .timeline {
  list-style: none;
  position: relative;
  margin: clamp(22px, 3.4vw, 36px) 0 0;
  padding: 0;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--mint) 0%, var(--green-700) 55%, rgba(20, 90, 69, .18) 100%);
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 clamp(22px, 3vw, 32px) 32px;
}

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

.page-about .timeline__dot {
  position: absolute;
  left: 0;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--cream);
  border: 2px solid var(--green-700);
}

.page-about .timeline__year {
  display: block;
  font-size: clamp(19px, 2.4vw, 26px);
  font-weight: 600;
  letter-spacing: -.02em;
  color: var(--green-900);
}

.page-about .timeline__title {
  margin: 2px 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .timeline__desc {
  margin: 0;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.82;
  color: #4A443B;
}

/* ---------- 收尾 ---------- */
.page-about .about-next {
  padding: clamp(40px, 6vw, 84px) var(--gutter);
  background: var(--cream);
}

.page-about .about-next__inner {
  max-width: var(--about-max);
  margin: 0 auto;
  display: grid;
  gap: clamp(24px, 3.4vw, 48px);
}

.page-about .about-next__title {
  margin: 0 0 12px;
  font-size: clamp(22px, 3.4vw, 34px);
  font-weight: 800;
  letter-spacing: -.02em;
  color: var(--green-900);
}

.page-about .about-next__text {
  margin: 0;
  max-width: 32em;
  font-size: 15px;
  line-height: 1.85;
  color: #4A443B;
}

.page-about .next-links {
  display: grid;
  border-top: 1px solid var(--about-rule);
}

.page-about .next-links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 15px 4px;
  border-bottom: 1px solid var(--about-rule);
  color: var(--green-900);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: background-color .3s var(--ease), padding-left .3s var(--ease);
}

.page-about .next-links__arrow {
  color: var(--orange);
  font-size: 14px;
}

.page-about .next-links a:hover,
.page-about .next-links a:focus-visible {
  background: var(--mint-100);
  padding-left: 14px;
  outline: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: start;
  }

  .page-about .crew {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .loop {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: center;
  }
}

@media (min-width: 860px) {
  .page-about .chapter__inner {
    grid-template-columns: clamp(120px, 14vw, 190px) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 64px);
  }

  .page-about .chapter__rail {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    align-self: start;
  }

  .page-about .chapter__tag {
    writing-mode: vertical-rl;
    letter-spacing: .34em;
    margin-top: 4px;
  }

  .page-about .timeline__item {
    padding-left: 42px;
  }

  .page-about .timeline::before {
    left: 7px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero__inner {
    padding-right: 46px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(248px, .72fr);
    align-items: end;
  }

  .page-about .about-hero__note {
    position: absolute;
    right: 0;
    top: 6px;
    margin: 0;
    writing-mode: vertical-rl;
    letter-spacing: .42em;
  }

  .page-about .about-hero__note::before {
    display: none;
  }
}
<<<END>>>