.page-about {
  --about-rail-w: 120px;
  --about-body-max: 74ch;
}

/* ---------- 面包屑与首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  color: var(--white);
  padding: clamp(16px, 3vw, 26px) 0 clamp(40px, 6vw, 76px);
  background:
    radial-gradient(115% 85% at 86% 4%, rgba(56, 242, 208, 0.16) 0%, rgba(56, 242, 208, 0) 60%),
    linear-gradient(158deg, var(--ink) 0%, var(--ink-2) 58%, var(--turf) 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: var(--turf-stripes);
  opacity: 0.55;
  pointer-events: none;
}

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

.page-about .about-hero .breadcrumb__list {
  margin: 0 0 clamp(24px, 5vw, 48px);
}

.page-about .about-hero .breadcrumb__link,
.page-about .about-hero .breadcrumb__sep {
  color: var(--mist);
}

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

.page-about .about-hero__copy {
  max-width: 20ch;
}

.page-about .about-hero__title {
  color: var(--white);
  margin: 14px 0 20px;
  line-height: 1.02;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lede {
  max-width: 44ch;
  color: var(--fog);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.72;
  margin: 0;
}

.page-about .about-hero__copy {
  max-width: none;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 4vw, 36px);
}

.page-about .about-hero__ticker {
  list-style: none;
  margin: clamp(32px, 6vw, 56px) 0 0;
  padding: clamp(16px, 2.4vw, 24px) 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 12px;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-hero__tick {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-hero__tick-num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(1.5rem, 3.2vw, 2.1rem);
  line-height: 1;
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .about-hero__tick-label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding: clamp(44px, 8vw, 96px) 0;
  background: var(--ink);
}

.page-about .about-chapter--tint {
  background:
    linear-gradient(180deg, rgba(12, 33, 26, 0.96) 0%, rgba(7, 19, 15, 0.96) 100%),
    var(--ink-2);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 3vw, 32px);
}

.page-about .about-chapter__rail {
  display: flex;
  align-items: baseline;
  gap: 10px;
  min-width: 0;
}

.page-about .about-chapter__num {
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--cyan);
  flex: 0 0 auto;
}

.page-about .about-chapter__label {
  font-family: var(--sans);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--mist);
  white-space: nowrap;
}

.page-about .about-chapter__body {
  min-width: 0;
}

.page-about .about-chapter__body > p {
  max-width: var(--about-body-max);
  color: var(--fog);
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.78;
  margin: 0 0 1.05em;
}

.page-about .about-chapter__body .section-title {
  color: var(--white);
  margin: 0 0 clamp(16px, 2.6vw, 24px);
  max-width: 22ch;
}

/* ---------- 大图与拉页引言 ---------- */
.page-about .about-spread {
  background: var(--ink);
  padding: clamp(8px, 2vw, 20px) 0 clamp(44px, 7vw, 84px);
}

.page-about .about-figure {
  margin: 0 0 clamp(28px, 5vw, 52px);
}

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

.page-about .about-figure .img-frame__media {
  aspect-ratio: 14 / 9;
  overflow: hidden;
}

.page-about .about-figure .img-frame__media img {
  height: 100%;
}

.page-about .about-quote {
  position: relative;
  margin: 0;
  padding: clamp(24px, 4vw, 44px) clamp(20px, 4vw, 48px);
  border-left: 3px solid var(--orange);
  background: linear-gradient(118deg, rgba(56, 242, 208, 0.12) 0%, rgba(56, 242, 208, 0) 72%);
  max-width: 62ch;
}

.page-about .about-quote__mark {
  display: block;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(34px, 5vw, 52px);
  line-height: 0.8;
  color: var(--orange);
  margin-bottom: 8px;
}

.page-about .about-quote__text {
  margin: 0;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(20px, 3.2vw, 30px);
  line-height: 1.42;
  letter-spacing: -0.01em;
  color: var(--white);
}

/* ---------- 三步清单 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.page-about .about-step {
  position: relative;
  background: var(--turf);
  padding: 18px 18px 20px;
  clip-path: var(--cut);
  min-width: 0;
}

.page-about .about-step::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--cyan);
}

.page-about .about-step__num {
  display: block;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--mist);
  margin-bottom: 10px;
}

.page-about .about-step__title {
  margin: 0 0 6px;
  font-family: var(--sans);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .about-step__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--fog);
}

/* ---------- 轮次值守 ---------- */
.page-about .about-duty {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 34px);
  align-items: start;
}

.page-about .about-duty__text p {
  max-width: var(--about-body-max);
  color: var(--fog);
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.78;
  margin: 0 0 1.05em;
}

.page-about .about-duty__media {
  margin: 0;
}

.page-about .about-duty__media .img-frame__media {
  aspect-ratio: 12 / 8;
  overflow: hidden;
}

.page-about .about-duty__media .img-frame__media img {
  height: 100%;
}

/* ---------- 覆盖版图 ---------- */
.page-about .about-cover {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 32px);
  margin-top: clamp(22px, 3.5vw, 34px);
  align-items: start;
}

.page-about .about-cover__media {
  margin: 0;
}

.page-about .about-cover__media .img-frame__media {
  aspect-ratio: 1 / 1;
  overflow: hidden;
}

.page-about .about-cover__media .img-frame__media img {
  height: 100%;
}

.page-about .about-cover__panel {
  min-width: 0;
}

.page-about .about-cover .segmented {
  display: grid;
  gap: 18px;
}

.page-about .about-cover .segmented__list {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 4px;
  padding: 4px;
  background: rgba(7, 19, 15, 0.6);
  border: 1px solid var(--line);
}

.page-about .about-cover .segmented__btn {
  font-family: var(--sans);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.06em;
  padding: 8px 16px;
  border: 0;
  background: transparent;
  color: var(--mist);
  cursor: pointer;
}

.page-about .about-cover .segmented__btn[aria-selected="true"] {
  background: var(--cyan);
  color: var(--ink);
}

.page-about .about-cover .segmented__panel[hidden] {
  display: none;
}

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

.page-about .about-band {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 4px 12px;
  align-items: center;
}

.page-about .about-band__label {
  grid-column: 1;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--fog);
}

.page-about .about-band__value {
  grid-column: 2;
  grid-row: 1 / span 2;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(1.3rem, 2.4vw, 1.7rem);
  line-height: 1;
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .about-band__track {
  grid-column: 1;
  display: block;
  height: 6px;
  background: rgba(56, 242, 208, 0.14);
  overflow: hidden;
}

.page-about .about-band__bar {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--mist) 100%);
}

.page-about .about-cover__note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
  max-width: 52ch;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0 0 0 30px;
  position: relative;
  display: grid;
  gap: clamp(16px, 2.6vw, 24px);
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--line-strong);
}

.page-about .about-timeline__item {
  position: relative;
  min-width: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 7px;
  width: 12px;
  height: 12px;
  background: var(--cyan);
  transform: rotate(45deg);
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.18em;
  color: var(--cyan);
  margin-bottom: 8px;
}

.page-about .about-timeline__card {
  background: rgba(255, 255, 255, 0.03);
  border-left: 2px solid var(--line);
  padding: 14px 16px 16px;
  transition: border-color 200ms ease, background-color 200ms ease;
}

.page-about .about-timeline__item:hover .about-timeline__card,
.page-about .about-timeline__item:focus-within .about-timeline__card {
  border-left-color: var(--cyan);
  background: rgba(56, 242, 208, 0.07);
}

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

.page-about .about-timeline__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.68;
  color: var(--fog);
  max-width: 56ch;
}

/* ---------- 三条主张 ---------- */
.page-about .about-values {
  list-style: none;
  margin: clamp(22px, 3.5vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .about-value {
  background: var(--turf);
  padding: 22px 20px 24px;
  clip-path: var(--cut);
  min-width: 0;
}

.page-about .about-value__num {
  display: block;
  font-family: var(--mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  margin-bottom: 12px;
}

.page-about .about-value__title {
  margin: 0 0 8px;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(22px, 2.8vw, 28px);
  line-height: 1.2;
  color: var(--white);
}

.page-about .about-value__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--fog);
}

/* ---------- 结尾入口 ---------- */
.page-about .about-next {
  background:
    linear-gradient(140deg, var(--turf) 0%, var(--ink) 70%);
  padding: clamp(44px, 7vw, 88px) 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-next__title {
  margin: 0 0 12px;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(1.6rem, 3.6vw, 2.4rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-next__lede {
  margin: 0 0 clamp(24px, 4vw, 36px);
  max-width: 46ch;
  font-size: clamp(15px, 1.5vw, 16.5px);
  line-height: 1.7;
  color: var(--fog);
}

.page-about .about-next__links {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.page-about .about-next__link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 18px;
  background: rgba(56, 242, 208, 0.08);
  border: 1px solid var(--line);
  color: var(--white);
  font-family: var(--sans);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.03em;
  text-decoration: none;
  transition: background-color 180ms ease, border-color 180ms ease, color 180ms ease;
}

.page-about .about-next__link span {
  font-family: var(--mono);
  color: var(--cyan);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink);
}

.page-about .about-next__link:hover span,
.page-about .about-next__link:focus-visible span {
  color: var(--ink);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__ticker {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 860px) {
  .page-about .about-duty {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 1fr);
  }

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

@media (min-width: 960px) {
  .page-about .about-hero {
    padding-bottom: clamp(56px, 7vw, 92px);
  }

  .page-about .about-hero__copy {
    max-width: 26ch;
  }

  .page-about .about-chapter__grid {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 60px);
  }

  .page-about .about-chapter__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-chapter__num {
    writing-mode: vertical-rl;
    font-size: 15px;
    letter-spacing: 0.42em;
    padding-bottom: 4px;
  }

  .page-about .about-chapter__label {
    writing-mode: vertical-rl;
    letter-spacing: 0.32em;
    font-size: 12.5px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--cyan);
  }

  .page-about .about-cover {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  }

  .page-about .about-quote {
    margin-left: calc(var(--about-rail-w) + clamp(28px, 4vw, 60px));
  }

  .page-about .about-figure {
    margin-left: calc(var(--about-rail-w) + clamp(28px, 4vw, 60px));
  }

  .page-about .about-timeline {
    padding-left: 34px;
  }

  .page-about .about-timeline__item::before {
    left: -34px;
  }

  .page-about .about-next__links {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__card,
  .page-about .about-next__link {
    transition: none;
  }
}
<<<END>>>