.page-about {
  --about-gap: clamp(30px, 5vw, 60px);
}

/* ---------- 面包屑与首屏 ---------- */
.page-about .about-crumb {
  padding-block: clamp(20px, 4vw, 44px) 10px;
}

.page-about .about-hero {
  padding-bottom: clamp(40px, 7vw, 84px);
}

.page-about .about-hero__frame {
  position: relative;
  padding: clamp(30px, 5.5vw, 68px) clamp(20px, 4.5vw, 60px);
  background:
    radial-gradient(120% 150% at 6% -12%, rgba(34, 211, 238, .16), transparent 58%),
    linear-gradient(180deg, rgba(11, 20, 24, .94), rgba(5, 7, 11, .9));
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-size: clamp(34px, 6vw, 68px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--paper);
  text-wrap: balance;
  max-width: 20ch;
}

.page-about .about-hero__lead {
  margin: 22px 0 0;
  max-width: 58ch;
  font-size: clamp(15.5px, 1.6vw, 18px);
  line-height: 1.85;
  color: var(--paper-soft);
}

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

/* 关键数字条 */
.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(22px, 3.5vw, 36px) 0 0;
  padding: 0;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-facts__item {
  display: flex;
  flex-direction: column-reverse;
  gap: 6px;
  padding: 20px 18px 22px;
  background: var(--panel);
  min-width: 0;
}

.page-about .about-facts__label {
  margin: 0;
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.page-about .about-facts__num {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 4.4vw, 40px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -.01em;
  color: var(--cyan);
}

/* ---------- 章节索引条 ---------- */
.page-about .about-index {
  position: sticky;
  top: var(--header-h);
  z-index: 6;
  background: linear-gradient(180deg, rgba(5, 7, 11, .96), rgba(5, 7, 11, .84));
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 12px 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--line-soft);
  color: var(--paper-dim);
  font-size: 13px;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  transition: color .22s var(--ease), border-color .22s var(--ease), background-color .22s var(--ease);
}

.page-about .about-index__link .mono {
  font-size: 11px;
  color: var(--cyan);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--paper);
  border-color: var(--line);
  background: rgba(34, 211, 238, .1);
}

/* ---------- 通用文本节奏 ---------- */
.page-about h2 {
  margin: 10px 0 0;
  font-size: clamp(26px, 3.4vw, 40px);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -.02em;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .about-lead {
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.82;
  color: var(--paper-soft);
}

.page-about .about-text {
  margin: 0 0 14px;
  max-width: 58ch;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--paper-soft);
}

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

.page-about .about-subhead {
  margin: 0 0 12px;
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 800;
  letter-spacing: -.015em;
  color: var(--paper);
}

.page-about .prose p {
  color: var(--paper-soft);
}

/* ---------- 图片容器 ---------- */
.page-about .media {
  position: relative;
  display: block;
  margin: 0;
  border-radius: var(--r-lg);
  border: 1px solid var(--line-soft);
  overflow: hidden;
  background: var(--panel);
}

.page-about .media img {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .media__caption {
  position: absolute;
  inset-inline: 0;
  bottom: 0;
  margin: 0;
  padding: 34px 18px 14px;
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--paper-dim);
  background: linear-gradient(180deg, transparent, rgba(5, 7, 11, .88));
}

/* ---------- 起点（慢） ---------- */
.page-about .about-origin {
  padding-block: clamp(56px, 9vw, 116px);
}

.page-about .about-origin__grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-quote {
  margin: clamp(26px, 4vw, 42px) 0 0;
  padding: 0;
  border: 0;
  max-width: 22ch;
  font-size: clamp(21px, 2.9vw, 34px);
  font-weight: 900;
  line-height: 1.36;
  letter-spacing: -.018em;
  color: var(--paper);
}

.page-about .about-quote::before {
  content: "";
  display: block;
  width: 46px;
  height: 2px;
  margin-bottom: 22px;
  background: var(--cyan);
}

.page-about .about-origin__tail {
  margin: 24px 0 0;
  max-width: 56ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--paper-dim);
}

.page-about .about-origin__figure {
  aspect-ratio: 14 / 9;
  border-radius: var(--r-lg);
}

/* ---------- 方法（蓝绿分区） ---------- */
.page-about .about-method {
  padding-block: clamp(56px, 9vw, 112px);
}

.page-about .about-method__head {
  max-width: 68ch;
}

.page-about .about-method__grid {
  display: grid;
  gap: clamp(28px, 4.5vw, 52px);
  margin-top: clamp(30px, 5vw, 54px);
}

.page-about .about-method__figure {
  aspect-ratio: 1 / 1;
  border-radius: var(--r-xl);
}

.page-about .about-method__block + .about-method__block {
  margin-top: clamp(28px, 4vw, 44px);
  padding-top: clamp(24px, 3.5vw, 36px);
  border-top: 1px solid var(--line);
}

.page-about .about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tag {
  display: inline-flex;
  align-items: center;
  padding: 9px 15px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(34, 211, 238, .07);
  color: var(--paper);
  font-size: 13.5px;
  line-height: 1;
  white-space: nowrap;
}

/* ---------- 时间线（靛紫分区） ---------- */
.page-about .about-timeline {
  padding-block: clamp(56px, 9vw, 118px);
}

.page-about .about-timeline__wrap {
  display: grid;
  gap: clamp(30px, 4.5vw, 56px);
}

.page-about .about-timeline__track {
  position: relative;
  margin: 0;
  padding: 4px 0 0 30px;
  list-style: none;
}

.page-about .about-timeline__track::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(34, 211, 238, .06));
}

.page-about .about-era {
  position: relative;
  padding-bottom: clamp(26px, 3.5vw, 38px);
}

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

.page-about .about-era::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 9px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--indigo);
  border: 2px solid var(--cyan);
  transition: box-shadow .26s var(--ease), background-color .26s var(--ease);
}

.page-about .about-era__head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}

.page-about .about-era__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 3.6vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--cyan);
}

.page-about .about-era__ver {
  padding: 3px 10px;
  border-radius: 999px;
  border: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--muted);
}

.page-about .about-era h3 {
  margin: 10px 0 6px;
  font-size: 17.5px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--paper);
  transition: color .24s var(--ease);
}

.page-about .about-era p {
  margin: 0;
  max-width: 58ch;
  font-size: 14.8px;
  line-height: 1.78;
  color: var(--paper-dim);
}

.page-about .about-timeline__figure {
  aspect-ratio: 2 / 1;
  margin-top: clamp(30px, 5vw, 56px);
  border-radius: var(--r-lg);
}

/* ---------- 团队（炭黑底板） ---------- */
.page-about .about-team {
  padding-block: clamp(56px, 9vw, 112px);
}

.page-about .about-team__grid {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(28px, 4.5vw, 50px);
}

.page-about .about-bars {
  display: grid;
  gap: 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-bars__meta {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 9px;
}

.page-about .about-bars__name {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--paper);
}

.page-about .about-bars__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 14.5px;
  color: var(--cyan);
}

.page-about .about-bars__track {
  height: 10px;
  border-radius: 999px;
  background: rgba(143, 163, 168, .14);
  overflow: hidden;
}

.page-about .about-bars__fill {
  display: block;
  height: 100%;
  width: 0;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(34, 211, 238, var(--tone, 1)), rgba(34, 211, 238, calc(var(--tone, 1) * .35)));
  transition: width .9s var(--ease);
}

.page-about .about-bars__row:nth-child(1) .about-bars__fill { width: 75%; --tone: 1; }
.page-about .about-bars__row:nth-child(2) .about-bars__fill { width: 100%; --tone: .84; }
.page-about .about-bars__row:nth-child(3) .about-bars__fill { width: 56%; --tone: .66; }
.page-about .about-bars__row:nth-child(4) .about-bars__fill { width: 38%; --tone: .48; }
.page-about .about-bars__row:nth-child(5) .about-bars__fill { width: 19%; --tone: .32; }

.page-about .about-bars__total {
  margin: 22px 0 0;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-about .about-team__link {
  margin: 22px 0 0;
}

/* ---------- 覆盖面 ---------- */
.page-about .about-coverage {
  padding-block: clamp(56px, 9vw, 112px);
}

.page-about .about-coverage__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: clamp(28px, 4.5vw, 50px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-cov {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 22px 20px 24px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: linear-gradient(160deg, rgba(11, 20, 24, .9), rgba(5, 7, 11, .6));
  transition: border-color .26s var(--ease), transform .26s var(--ease);
}

.page-about .about-cov__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -.01em;
  color: var(--cyan);
}

.page-about .about-cov__name {
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--muted);
}

.page-about .about-cov p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--paper-dim);
}

.page-about .about-coverage__note {
  margin-top: clamp(28px, 4vw, 46px);
  padding-top: clamp(24px, 3.5vw, 36px);
  border-top: 1px solid var(--line);
  max-width: 68ch;
}

.page-about .about-coverage__link {
  margin: 18px 0 0;
}

/* ---------- 三条标准（收紧） ---------- */
.page-about .about-standards {
  position: relative;
  padding-block: clamp(56px, 9vw, 120px);
  background:
    radial-gradient(90% 120% at 50% 0%, rgba(34, 211, 238, .1), transparent 62%),
    linear-gradient(180deg, var(--ink), #060c11);
  border-top: 1px solid var(--line-soft);
}

.page-about .about-pillars {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin: clamp(30px, 5vw, 56px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-pillar {
  padding: 26px 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-pillar:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-pillar__idx {
  display: block;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-about .about-pillar h3 {
  margin: 10px 0 10px;
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 900;
  letter-spacing: -.018em;
  color: var(--paper);
}

.page-about .about-pillar p {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--paper-soft);
}

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

.page-about .about-standards__cta {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: clamp(30px, 4.5vw, 48px);
}

.page-about .about-standards__cta-text {
  margin: 0;
  max-width: 48ch;
  font-size: clamp(16px, 1.8vw, 20px);
  font-weight: 700;
  line-height: 1.7;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .about-standards__btns {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 锚点与交互 ---------- */
.page-about #origin,
.page-about #method,
.page-about #timeline,
.page-about #team,
.page-about #coverage,
.page-about #standards {
  scroll-margin-top: calc(var(--header-h) + 68px);
}

@media (hover: hover) {
  .page-about .about-era:hover::before,
  .page-about .about-era:focus-within::before {
    background: var(--cyan);
    box-shadow: 0 0 0 5px rgba(34, 211, 238, .16);
  }

  .page-about .about-era:hover h3 {
    color: var(--cyan);
  }

  .page-about .about-cov:hover {
    border-color: var(--line);
    transform: translateY(-2px);
  }
}

/* ---------- 断点 ---------- */
@media (min-width: 560px) {
  .page-about .about-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-standards__cta {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
  }
}

@media (min-width: 900px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
    align-items: start;
  }

  .page-about .about-method__grid {
    grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr);
    align-items: center;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: start;
  }

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

  .page-about .about-pillars {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    column-gap: clamp(24px, 4vw, 56px);
  }

  .page-about .about-pillar {
    border-bottom: 1px solid var(--line-soft);
    padding: 30px 0 32px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-timeline__wrap {
    grid-template-columns: minmax(0, .74fr) minmax(0, 1.26fr);
    align-items: start;
  }

  .page-about .about-timeline__intro {
    position: sticky;
    top: calc(var(--header-h) + 76px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-bars__fill,
  .page-about .about-era::before,
  .page-about .about-era h3,
  .page-about .about-cov,
  .page-about .about-index__link {
    transition: none;
  }

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