.page-about {
  --about-rail: 208px;
  --about-gap: clamp(24px, 3vw, 44px);
  --about-pad: clamp(18px, 3vw, 32px);
  color: var(--c-mist);
  font-family: var(--font-body);
  padding-bottom: clamp(48px, 7vw, 96px);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(20px, 3.5vw, 34px) var(--gutter) clamp(28px, 4.5vw, 52px);
  background:
    linear-gradient(118deg, var(--c-ice) 0%, var(--c-ice) 42%, var(--c-night) 78%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: 0;
  top: -18%;
  left: -8%;
  width: 62%;
  height: 130%;
  background: linear-gradient(100deg, rgba(46, 242, 208, 0.13), rgba(46, 242, 208, 0) 68%);
  transform: skewX(-9deg);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: 2;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--c-cyan), rgba(46, 242, 208, 0) 55%);
  pointer-events: none;
}

.page-about .about-hero__art {
  position: absolute;
  z-index: 0;
  top: 0;
  right: -10%;
  width: min(70%, 440px);
  height: 100%;
  opacity: 0.34;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(90deg, rgba(0, 0, 0, 0) 0%, #000 52%);
  mask-image: linear-gradient(90deg, rgba(0, 0, 0, 0) 0%, #000 52%);
}

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

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

.page-about .about-hero__inner {
  position: relative;
  z-index: 3;
  max-width: var(--maxw);
  margin-inline: auto;
}

.page-about .about-hero .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0 0 clamp(14px, 2.4vw, 26px);
  padding: 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .about-hero .breadcrumbs__link {
  color: var(--c-slate);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-hero .breadcrumbs__link:hover,
.page-about .about-hero .breadcrumbs__link:focus-visible {
  color: var(--c-cyan);
  border-bottom-color: var(--c-cyan);
}

.page-about .about-hero .breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--c-slate);
}

.page-about .about-hero .breadcrumbs__item span {
  color: var(--c-mist);
}

.page-about .about-hero .eyebrow {
  margin: 0 0 14px;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--c-cyan);
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  font-family: var(--font-display);
  font-size: clamp(30px, 6.4vw, 66px);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--c-mist);
  max-width: 18ch;
}

.page-about .about-hero__lead {
  margin: 0 0 clamp(22px, 3.4vw, 36px);
  max-width: 62ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.78;
  color: rgba(234, 246, 255, 0.84);
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(112px, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line-soft);
  border: 1px solid var(--line);
}

.page-about .about-figures li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 14px 12px;
  background: rgba(6, 24, 38, 0.72);
}

.page-about .about-fig {
  font-family: var(--font-data);
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 700;
  line-height: 1;
  color: var(--c-yellow);
}

.page-about .about-fig__unit {
  font-size: 0.55em;
  margin-left: 2px;
  color: var(--c-yellow);
}

.page-about .about-fig__label {
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--c-slate);
}

/* ---------- 主栅格 ---------- */
.page-about .about-shell {
  max-width: var(--maxw);
  margin-inline: auto;
  padding: clamp(26px, 4vw, 52px) var(--gutter) 0;
  display: grid;
  gap: var(--about-gap);
}

/* ---------- 目录索引 ---------- */
.page-about .about-index {
  border-top: 2px solid var(--c-orange);
  padding-top: 12px;
}

.page-about .about-index__title {
  margin: 0 0 12px;
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: 0.24em;
  color: var(--c-slate);
}

.page-about .about-index__list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index__list a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 10px;
  font-size: 14px;
  color: rgba(234, 246, 255, 0.78);
  text-decoration: none;
  background: var(--glass);
  border-left: 1px solid transparent;
  transition: color 0.2s var(--ease), background 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--c-cyan);
  background: var(--glass-strong);
  border-left-color: var(--c-cyan);
}

.page-about .about-index__no {
  font-family: var(--font-data);
  font-size: 11px;
  color: var(--c-yellow);
}

/* ---------- 章节 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(22px, 3.2vw, 40px);
  min-width: 0;
}

.page-about .about-chapter {
  position: relative;
  scroll-margin-top: 24px;
  padding-top: clamp(18px, 2.6vw, 28px);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-chapter--glass {
  padding: var(--about-pad);
  background: var(--glass);
  border: 1px solid var(--line);
  box-shadow: inset 0 1px 0 rgba(234, 246, 255, 0.06);
}

.page-about .about-chapter--timeline {
  border-top-color: var(--line-cyan);
}

.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: clamp(14px, 2vw, 20px);
}

.page-about .about-chapter__no {
  flex: none;
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--c-yellow);
  padding: 2px 7px;
  border: 1px solid var(--line);
}

.page-about .about-chapter h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 3.2vw, 34px);
  font-weight: 700;
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--c-mist);
}

.page-about .about-chapter h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(16px, 1.8vw, 19px);
  font-weight: 700;
  line-height: 1.35;
  color: var(--c-mist);
}

.page-about .about-chapter p {
  margin: 0 0 14px;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(234, 246, 255, 0.8);
}

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

.page-about .about-chapter a {
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 242, 208, 0.4);
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .about-chapter a:hover,
.page-about .about-chapter a:focus-visible {
  color: var(--c-yellow);
  border-bottom-color: var(--c-yellow);
}

.page-about .about-chapter__lead {
  max-width: 64ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(234, 246, 255, 0.8);
  margin-bottom: clamp(16px, 2.4vw, 24px);
}

.page-about .about-chapter__tail {
  margin-top: clamp(16px, 2.4vw, 22px);
  padding-top: 14px;
  border-top: 1px dashed var(--line-soft);
}

.page-about .about-chapter__grid {
  display: grid;
  gap: clamp(18px, 2.6vw, 28px);
}

/* ---------- 引述块 ---------- */
.page-about .about-quote {
  position: relative;
  padding: 18px 20px 16px 22px;
  background: linear-gradient(160deg, rgba(18, 74, 106, 0.55), rgba(6, 24, 38, 0.3));
  border-left: 3px solid var(--c-orange);
}

.page-about .about-quote__mark {
  margin: 0;
  font-family: var(--font-data);
  font-size: 34px;
  line-height: 0.7;
  color: var(--c-cyan);
}

.page-about .about-quote__text {
  margin: 6px 0 12px;
  font-family: var(--font-display);
  font-size: clamp(16px, 1.9vw, 20px);
  line-height: 1.55;
  color: var(--c-mist);
}

.page-about .about-quote__sign {
  margin: 0;
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-slate);
}

/* ---------- 双层数据 ---------- */
.page-about .about-layers {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-layer {
  padding: clamp(16px, 2.2vw, 22px);
  background: rgba(6, 24, 38, 0.68);
  transition: background 0.22s var(--ease);
}

.page-about .about-layer:hover {
  background: rgba(18, 74, 106, 0.62);
}

.page-about .about-layer__tag {
  margin: 0 0 8px;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--c-orange);
}

.page-about .about-layer:last-child .about-layer__tag {
  color: var(--c-cyan);
}

.page-about .about-layer__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .about-layer__list li {
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: rgba(234, 246, 255, 0.8);
  padding: 3px 8px;
  border: 1px solid var(--line);
}

/* ---------- 图片 ---------- */
.page-about .about-media {
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  position: relative;
  border: 1px solid var(--line);
  background: var(--c-ice);
  overflow: hidden;
}

.page-about .about-media::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-cyan), var(--c-orange));
  opacity: 0.75;
}

.page-about .about-media--band {
  border-left: 3px solid var(--c-cyan);
}

.page-about .about-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 16 / 9;
  filter: saturate(0.92) contrast(1.04);
}

.page-about .about-media--band img {
  aspect-ratio: 2 / 1;
}

.page-about .about-media__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  margin: 0;
  padding: 8px 12px;
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: rgba(234, 246, 255, 0.86);
  background: rgba(6, 24, 38, 0.82);
  border-top: 1px solid var(--line);
  border-right: 1px solid var(--line);
}

/* ---------- 团队分工 ---------- */
.page-about .about-roles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 10px;
}

.page-about .about-role {
  position: relative;
  padding: 16px 16px 14px;
  background: var(--glass);
  border: 1px solid var(--line);
  transition: border-color 0.22s var(--ease), transform 0.22s var(--ease), background 0.22s var(--ease);
}

.page-about .about-role:hover {
  border-color: var(--c-cyan);
  background: var(--glass-strong);
  transform: translateY(-2px);
}

.page-about .about-role__num {
  margin: 0 0 6px;
  font-family: var(--font-data);
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  color: var(--c-yellow);
}

.page-about .about-role p {
  font-size: 14px;
  line-height: 1.7;
  margin-bottom: 10px;
}

.page-about .about-role .about-role__tag {
  margin: 0;
  display: inline-block;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--c-slate);
  padding: 3px 8px;
  border: 1px solid var(--line);
  transition: color 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .about-role:hover .about-role__tag {
  color: var(--c-cyan);
  border-color: var(--line-cyan);
}

/* ---------- 年份时间轴 ---------- */
.page-about .about-years {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-years::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--c-cyan), rgba(46, 242, 208, 0.06));
}

.page-about .about-year {
  position: relative;
  padding: 0 0 22px 28px;
}

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

.page-about .about-year::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 1px solid var(--line-cyan);
  background: var(--c-night);
  transition: background 0.22s var(--ease), box-shadow 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .about-year:hover::before,
.page-about .about-year:focus-within::before {
  background: var(--c-cyan);
  border-color: var(--c-cyan);
  box-shadow: 0 0 0 5px rgba(46, 242, 208, 0.13);
}

.page-about .about-year__num {
  display: inline-block;
  margin-bottom: 6px;
  font-family: var(--font-data);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--c-yellow);
}

.page-about .about-year__body p {
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(234, 246, 255, 0.78);
}

.page-about .about-year:hover .about-year__body p {
  color: rgba(234, 246, 255, 0.92);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-cadence {
  margin: 0;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
}

.page-about .about-cadence__row {
  padding: 14px 16px;
  background: rgba(6, 24, 38, 0.55);
}

.page-about .about-cadence__row dt {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 15.5px;
  font-weight: 700;
  color: var(--c-mist);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
}

.page-about .about-cadence__key {
  font-family: var(--font-data);
  font-size: 11.5px;
  font-weight: 400;
  letter-spacing: 0.12em;
  color: var(--c-night);
  background: var(--c-cyan);
  padding: 2px 7px;
}

.page-about .about-cadence__row dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(234, 246, 255, 0.76);
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-coverage {
  display: grid;
  gap: clamp(18px, 2.6vw, 26px);
}

.page-about .about-coverage__side {
  padding: 16px 18px;
  background: linear-gradient(200deg, rgba(15, 92, 90, 0.42), rgba(6, 24, 38, 0.2));
  border: 1px solid var(--line);
}

.page-about .about-coverage__label {
  margin: 0 0 8px;
  font-family: var(--font-data);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--c-cyan);
}

.page-about .about-coverage__list {
  margin: 0 0 16px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 4px;
}

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

.page-about .about-coverage__list li {
  font-size: 13.5px;
  line-height: 1.6;
  color: rgba(234, 246, 255, 0.8);
  padding-left: 12px;
  position: relative;
}

.page-about .about-coverage__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 5px;
  height: 5px;
  background: var(--c-orange);
}

/* ---------- 出口 ---------- */
.page-about .about-next {
  padding-top: clamp(20px, 3vw, 32px);
  border-top: 2px solid var(--c-orange);
}

.page-about .about-next h2 {
  margin: 0 0 clamp(14px, 2vw, 20px);
  font-family: var(--font-display);
  font-size: clamp(20px, 2.8vw, 28px);
  font-weight: 700;
  color: var(--c-mist);
}

.page-about .about-next__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 10px;
}

.page-about .about-next__card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 18px 42px;
  text-decoration: none;
  background: var(--glass);
  border: 1px solid var(--line);
  transition: border-color 0.22s var(--ease), background 0.22s var(--ease), transform 0.22s var(--ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  border-color: var(--c-cyan);
  background: var(--glass-strong);
  transform: translateY(-2px);
}

.page-about .about-next__kicker {
  font-family: var(--font-data);
  font-size: 10.5px;
  letter-spacing: 0.22em;
  color: var(--c-slate);
}

.page-about .about-next__name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--c-mist);
}

.page-about .about-next__desc {
  font-size: 13.5px;
  line-height: 1.68;
  color: rgba(234, 246, 255, 0.76);
}

.page-about .about-next__arrow {
  position: absolute;
  right: 18px;
  bottom: 14px;
  font-family: var(--font-data);
  font-size: 18px;
  color: var(--c-orange);
  transition: transform 0.22s var(--ease), color 0.22s var(--ease);
}

.page-about .about-next__card:hover .about-next__arrow,
.page-about .about-next__card:focus-visible .about-next__arrow {
  color: var(--c-cyan);
  transform: translateX(4px);
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 720px) {
  .page-about .about-chapter__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: start;
  }

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

  .page-about .about-coverage {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: start;
  }

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

@media (min-width: 900px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 24px;
  }

  .page-about .about-index__list {
    grid-template-columns: minmax(0, 1fr);
    gap: 1px;
  }

  .page-about .about-hero {
    padding-bottom: clamp(36px, 5vw, 64px);
  }

  .page-about .about-hero__vert {
    display: block;
    position: absolute;
    z-index: 3;
    right: calc(var(--gutter) - 6px);
    top: 50%;
    transform: translateY(-50%);
    writing-mode: vertical-rl;
    font-family: var(--font-data);
    font-size: 11px;
    letter-spacing: 0.34em;
    color: rgba(127, 155, 176, 0.66);
    margin: 0;
    pointer-events: none;
  }

  .page-about .about-years {
    columns: 1;
  }

  .page-about .about-year {
    padding-left: 34px;
    padding-bottom: 26px;
  }
}

@media (min-width: 1160px) {
  .page-about .about-chapter--glass {
    padding: clamp(24px, 2.6vw, 36px);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-layer,
  .page-about .about-role,
  .page-about .about-role__tag,
  .page-about .about-year::before,
  .page-about .about-next__card,
  .page-about .about-next__arrow,
  .page-about .about-index__list a {
    transition: none;
  }

  .page-about .about-role:hover,
  .page-about .about-next__card:hover {
    transform: none;
  }

  .page-about .about-next__card:hover .about-next__arrow {
    transform: none;
  }
}
<<<END>>>