.page-about {
  --about-rail: 232px;
  --about-gap: 20px;
  position: relative;
  color: var(--white);
  background:
    radial-gradient(900px 520px at 84% -6%, rgba(14, 76, 138, 0.55), transparent 70%),
    radial-gradient(720px 460px at -6% 14%, rgba(255, 106, 26, 0.13), transparent 72%),
    var(--deep);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 26px 0 44px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 -1px 0;
  height: 3px;
  background: linear-gradient(90deg, var(--ice), var(--orange) 55%, transparent);
  opacity: 0.7;
}

.page-about .about-hero__crumbs {
  margin-bottom: 24px;
  font-size: 0.82rem;
  letter-spacing: 0.02em;
}

.page-about .about-hero__kicker {
  margin: 0 0 14px;
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  color: var(--ice);
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 0 0 22px;
  font-size: clamp(2.05rem, 7.2vw, 4.3rem);
  line-height: 1.06;
  font-weight: 900;
  letter-spacing: -0.02em;
  transform: skewX(-1.4deg);
  transform-origin: left center;
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--orange);
  text-shadow: var(--glow-orange);
}

.page-about .about-hero__body {
  display: grid;
  gap: 14px;
  max-width: 72ch;
}

.page-about .about-hero__lede {
  margin: 0;
  font-size: 1rem;
  line-height: 1.78;
  color: var(--white);
}

.page-about .about-hero__lede--sub {
  font-size: 0.94rem;
  color: var(--mist);
}

.page-about .about-facts {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .about-facts__item {
  padding: 14px 14px 16px;
  border: 2px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(160deg, rgba(11, 42, 74, 0.95), rgba(6, 26, 47, 0.95));
  box-shadow: var(--hard-soft);
}

.page-about .about-facts__num {
  display: block;
  font-size: 1.55rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--amber);
}

.page-about .about-facts__label {
  display: block;
  margin-top: 6px;
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--mist);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: 30px;
  padding: 34px 0 56px;
}

.page-about .about-index {
  order: -1;
  padding: 16px;
  border: 2px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(11, 42, 74, 0.72);
}

.page-about .about-index__label {
  margin: 0 0 12px;
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--mist);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px 12px;
}

.page-about .about-index__item a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 6px;
  border-left: 2px solid transparent;
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  font-size: 0.84rem;
  color: var(--mist);
  text-decoration: none;
  transition: color var(--speed) var(--ease), border-color var(--speed) var(--ease), background var(--speed) var(--ease);
}

.page-about .about-index__item a .data {
  font-size: 0.68rem;
  color: var(--arena);
}

.page-about .about-index__item a:hover,
.page-about .about-index__item a:focus-visible {
  color: var(--white);
  border-left-color: var(--ice);
  background: rgba(127, 219, 255, 0.08);
  outline: none;
}

.page-about .about-index__item a:hover .data,
.page-about .about-index__item a:focus-visible .data {
  color: var(--ice);
}

.page-about .about-content {
  display: grid;
  gap: 34px;
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .about-block {
  position: relative;
  padding: 26px 20px 30px;
  border: 2px solid var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(170deg, rgba(11, 42, 74, 0.92), rgba(6, 26, 47, 0.96));
  box-shadow: var(--hard);
}

.page-about .about-block::before {
  content: "";
  position: absolute;
  top: -2px;
  left: 26px;
  width: 68px;
  height: 3px;
  background: var(--orange);
  border-radius: 2px;
}

.page-about .about-block__num {
  margin: 0 0 10px;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--ice);
}

.page-about .about-block__title {
  margin: 0 0 14px;
  font-size: clamp(1.4rem, 4.4vw, 2.05rem);
  line-height: 1.24;
  font-weight: 900;
  letter-spacing: -0.01em;
}

.page-about .about-block__note {
  margin: 0 0 18px;
  max-width: 60ch;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-block__text p {
  margin: 0 0 14px;
  max-width: 66ch;
  font-size: 0.96rem;
  line-height: 1.82;
  color: var(--white);
}

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

.page-about .about-quote {
  margin: 20px 0 0;
  padding: 16px 18px;
  border-left: 4px solid var(--orange);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: linear-gradient(100deg, rgba(14, 76, 138, 0.58), rgba(6, 26, 47, 0.35));
}

.page-about .about-quote p {
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.75;
  color: var(--snow);
}

/* ---------- 三段式 ---------- */
.page-about .about-steps {
  display: grid;
  gap: 14px;
}

.page-about .about-step {
  padding: 18px 16px 20px;
  border: 2px solid var(--line-soft);
  border-radius: var(--r-md);
  background: rgba(6, 26, 47, 0.72);
  box-shadow: var(--hard-soft);
  transition: border-color var(--speed) var(--ease), box-shadow var(--speed) var(--ease), transform var(--speed) var(--ease);
}

.page-about .about-step:hover,
.page-about .about-step:focus-within {
  border-color: var(--line-strong);
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 rgba(2, 10, 20, 0.9);
}

.page-about .about-step__tag {
  display: inline-block;
  margin-bottom: 12px;
  font-size: 0.7rem;
  letter-spacing: 0.06em;
}

.page-about .about-step__title {
  margin: 0 0 8px;
  font-size: 1.06rem;
  font-weight: 800;
  color: var(--white);
}

.page-about .about-step__text {
  margin: 0;
  font-size: 0.89rem;
  line-height: 1.72;
  color: var(--mist);
}

/* ---------- 数据实验室 ---------- */
.page-about .about-lab {
  display: grid;
  gap: 22px;
}

.page-about .about-lab__text p {
  margin: 0 0 14px;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--white);
}

.page-about .about-lab__points {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-lab__points li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 12px;
  border-left: 3px solid var(--arena);
  background: rgba(14, 76, 138, 0.2);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  font-size: 0.86rem;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-lab__points .data {
  min-width: 46px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--ice);
}

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

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 22px;
}

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

.page-about .about-team__roles {
  display: grid;
  gap: 12px;
}

.page-about .about-role {
  padding: 14px 16px;
  border: 2px solid var(--line-soft);
  border-radius: var(--r-md);
  background: rgba(11, 42, 74, 0.6);
}

.page-about .about-role__title {
  margin: 0 0 6px;
  font-size: 0.98rem;
  font-weight: 800;
  color: var(--amber);
}

.page-about .about-role__text {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 区域 ---------- */
.page-about .about-region {
  display: grid;
  gap: 20px;
}

.page-about .about-region__copy p {
  margin: 0 0 14px;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--white);
}

.page-about .about-region__tags {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-region__tags li {
  padding: 6px 12px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-pill);
  font-size: 0.76rem;
  color: var(--ice);
  background: rgba(127, 219, 255, 0.08);
}

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

/* ---------- 合作 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 12px;
}

.page-about .about-partner {
  padding: 18px 16px;
  border: 2px solid var(--line-soft);
  border-radius: var(--r-md);
  background: linear-gradient(150deg, rgba(14, 76, 138, 0.34), rgba(11, 42, 74, 0.75));
  transition: border-color var(--speed) var(--ease), background var(--speed) var(--ease);
}

.page-about .about-partner:hover,
.page-about .about-partner:focus-within {
  border-color: var(--orange);
  background: linear-gradient(150deg, rgba(255, 106, 26, 0.14), rgba(11, 42, 74, 0.85));
}

.page-about .about-partner__num {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
  margin-bottom: 8px;
}

.page-about .about-partner__title {
  margin: 0 0 6px;
  font-size: 0.95rem;
  font-weight: 800;
  color: var(--white);
}

.page-about .about-partner__text {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.68;
  color: var(--mist);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 10px;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(232px, 1fr);
  gap: 12px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-mile {
  position: relative;
  scroll-snap-align: start;
  padding: 16px 16px 18px;
  border: 2px solid var(--line);
  border-radius: var(--r-md) var(--r-md) var(--r-md) 4px;
  background: linear-gradient(180deg, rgba(11, 42, 74, 0.96), rgba(6, 26, 47, 0.98));
  box-shadow: var(--hard-soft);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
  transition: transform var(--speed) var(--ease), border-color var(--speed) var(--ease), box-shadow var(--speed) var(--ease);
}

.page-about .about-mile:hover,
.page-about .about-mile:focus-within {
  border-color: var(--line-strong);
  transform: translateY(-4px);
  box-shadow: 6px 10px 0 rgba(2, 10, 20, 0.85);
}

.page-about .about-mile__year {
  display: block;
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--ice);
}

.page-about .about-mile__dot {
  display: block;
  width: 34px;
  height: 3px;
  margin: 8px 0 12px;
  background: linear-gradient(90deg, var(--orange), var(--amber));
  border-radius: 2px;
}

.page-about .about-mile__title {
  margin: 0 0 8px;
  font-size: 0.98rem;
  font-weight: 800;
  color: var(--white);
}

.page-about .about-mile__note {
  margin: 0;
  font-size: 0.83rem;
  line-height: 1.68;
  color: var(--mist);
}

/* ---------- 下一步 ---------- */
.page-about .about-block--closing {
  background: linear-gradient(160deg, rgba(14, 76, 138, 0.5), rgba(6, 26, 47, 0.98) 62%);
}

.page-about .about-next {
  display: grid;
  gap: 12px;
}

.page-about .about-next__card {
  display: block;
  padding: 16px 16px 18px;
  border: 2px solid var(--line-strong);
  border-radius: var(--r-md);
  background: rgba(6, 26, 47, 0.78);
  text-decoration: none;
  transition: border-color var(--speed) var(--ease), transform var(--speed) var(--ease), box-shadow var(--speed) var(--ease);
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  border-color: var(--orange);
  transform: translate(-2px, -2px);
  box-shadow: var(--hard);
  outline: none;
}

.page-about .about-next__label {
  display: block;
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: var(--ice);
  margin-bottom: 8px;
}

.page-about .about-next__title {
  display: block;
  font-size: 1.08rem;
  font-weight: 900;
  color: var(--white);
  margin-bottom: 6px;
}

.page-about .about-next__desc {
  display: block;
  font-size: 0.85rem;
  line-height: 1.68;
  color: var(--mist);
}

.page-about .about-next__foot {
  margin: 18px 0 0;
  font-size: 0.86rem;
  line-height: 1.72;
  color: var(--mist);
}

.page-about .about-next__foot a {
  color: var(--ice);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-next__foot a:hover,
.page-about .about-next__foot a:focus-visible {
  color: var(--white);
}

/* ---------- 图片兜底 ---------- */
.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
  }

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

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

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

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

  .page-about .about-block {
    padding: 32px 28px 36px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .about-hero {
    padding: 34px 0 58px;
  }

  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 44px;
    padding: 44px 0 72px;
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 112px;
    order: 0;
  }

  .page-about .about-index__list {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .page-about .about-index__item a {
    font-size: 0.88rem;
    padding: 9px 8px;
  }

  .page-about .about-content {
    gap: 48px;
  }

  .page-about .about-lab {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 30px;
    align-items: start;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 28px;
    align-items: start;
  }

  .page-about .about-region {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 30px;
    align-items: center;
  }

  /* 宽窄交替：让长叙事段落收窄，阅读更顺 */
  .page-about .about-block#start .about-block__text,
  .page-about .about-block#lab .about-block__title,
  .page-about .about-block#partners .about-block__title {
    max-width: 44ch;
  }

  .page-about .about-block--wide {
    padding-right: 40px;
  }

  /* 里程碑：悬停展开阶段说明 */
  .page-about .about-mile__note {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 220ms var(--ease), opacity 180ms var(--ease), margin-top 180ms var(--ease);
    margin-top: 0;
  }

  .page-about .about-mile:hover .about-mile__note,
  .page-about .about-mile:focus-within .about-mile__note {
    max-height: 160px;
    opacity: 1;
    margin-top: 2px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-body {
    grid-template-columns: 260px minmax(0, 1fr);
    gap: 56px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-step,
  .page-about .about-mile,
  .page-about .about-next__card,
  .page-about .about-index__item a {
    transition: none;
  }

  .page-about .about-step:hover,
  .page-about .about-mile:hover,
  .page-about .about-next__card:hover {
    transform: none;
  }
}
<<<END>>>