.page-about {
  --about-rail: 236px;
  --about-lead: #C3CFE0;
  --about-dim: #B9C6D8;
  background: var(--ice-100);
  color: var(--slate);
  font-family: var(--font-display);
  overflow-x: hidden;
  padding-bottom: clamp(40px, 6vw, 72px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--ink-900);
  color: var(--ice-100);
  border-bottom: var(--edge);
}

.page-about .about-hero__img {
  position: absolute;
  inset: 0;
  z-index: -1;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  opacity: 0.34;
  filter: grayscale(0.3) contrast(1.15);
}

.page-about .about-hero__body {
  padding-top: clamp(40px, 7vw, 96px);
  padding-bottom: clamp(34px, 5vw, 64px);
}

.page-about .about-hero__text {
  max-width: 860px;
}

.page-about .about-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 22px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--steel);
}

.page-about .about-crumb a {
  color: var(--frost);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .about-crumb a:hover {
  color: var(--mint);
  border-bottom-color: var(--mint);
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  max-width: 18em;
  font-family: var(--font-display);
  font-size: clamp(30px, 5.4vw, 58px);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 40em;
  font-size: clamp(15px, 1.9vw, 18px);
  line-height: 1.78;
  color: var(--about-lead);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  max-width: 900px;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  background: rgba(233, 238, 245, 0.18);
  border: 1px solid rgba(233, 238, 245, 0.18);
}

.page-about .about-stats__item {
  display: flex;
  flex-direction: column;
  min-width: 0;
  padding: 14px 16px 16px;
  background: rgba(11, 18, 32, 0.82);
}

.page-about .about-stats dt {
  order: 2;
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--steel);
}

.page-about .about-stats dd {
  order: 1;
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 40px);
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--mint);
}

.page-about .about-stats__item:nth-child(2) dd { color: var(--frost); }
.page-about .about-stats__item:nth-child(3) dd { color: var(--orange); }
.page-about .about-stats__item:nth-child(4) dd { color: var(--paper); }

.page-about .about-stats__u {
  margin-left: 4px;
  font-size: 13px;
  color: var(--steel);
}

/* ---------- 外壳与目录 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  padding-top: clamp(30px, 5vw, 60px);
}

.page-about .about-rail {
  min-width: 0;
  margin-bottom: 26px;
}

.page-about .about-toc__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--steel);
}

.page-about .about-toc__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc__list li {
  flex: 0 0 auto;
}

.page-about .about-toc__list a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 12px;
  border: var(--edge);
  background: var(--paper);
  color: var(--slate);
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
  white-space: nowrap;
  transition: border-color 0.18s ease, background 0.18s ease, color 0.18s ease;
}

.page-about .about-toc__list a span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--steel);
}

.page-about .about-toc__list a:hover {
  border-color: var(--orange);
  color: var(--ink-900);
}

.page-about .about-toc__list a[aria-current="true"] {
  border-color: var(--ink-900);
  background: var(--orange);
  color: var(--ink-900);
  font-weight: 700;
}

.page-about .about-toc__list a[aria-current="true"] span {
  color: var(--ink-900);
}

.page-about .about-rail__meta {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--steel);
}

/* ---------- 内容主干 ---------- */
.page-about .about-main {
  display: flex;
  flex-direction: column;
  gap: clamp(40px, 6vw, 78px);
  min-width: 0;
}

.page-about .about-sec {
  min-width: 0;
  scroll-margin-top: 90px;
}

.page-about .about-sec__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--ink-900);
}

.page-about .about-sec__num {
  flex: none;
  padding: 3px 8px;
  transform: skewX(-8deg);
  background: var(--violet);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.page-about .about-sec__title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(21px, 3vw, 32px);
  font-weight: 600;
  line-height: 1.28;
  letter-spacing: 0.01em;
  color: var(--ink-900);
}

.page-about .about-sec__lead {
  margin: 0 0 24px;
  max-width: 720px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--slate);
}

.page-about .about-sec p {
  max-width: 720px;
  font-size: 16px;
  line-height: 1.78;
}

/* ---------- 时间线 ---------- */
.page-about .about-tl {
  position: relative;
  margin: 0;
  padding: 0 0 0 30px;
  list-style: none;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 16px;
  width: 2px;
  background: linear-gradient(180deg, var(--orange) 0%, var(--violet) 52%, var(--frost) 100%);
}

.page-about .about-tl__item {
  position: relative;
  padding-bottom: clamp(28px, 4vw, 46px);
}

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

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 5px;
  width: 16px;
  height: 16px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--paper);
  border: 3px solid var(--ink-900);
}

.page-about .about-tl__item:last-child::before {
  background: var(--orange);
}

.page-about .about-tl__ver {
  display: inline-block;
  margin-bottom: 10px;
  padding: 2px 9px;
  background: var(--mint);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.page-about .about-tl__ver--now {
  background: var(--violet);
  color: var(--paper);
}

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

.page-about .about-tl__body h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(17px, 2.3vw, 21px);
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.page-about .about-tl__body p {
  margin: 0;
}

.page-about .about-tl__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tl__facts li {
  padding: 3px 10px;
  border: 1px solid var(--steel);
  background: var(--paper);
  color: var(--slate);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 22px 0 0;
  border: var(--edge);
  box-shadow: var(--shadow-hard);
  background: var(--ink-800);
  overflow: hidden;
}

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

.page-about .about-figure figcaption {
  padding: 9px 13px;
  border-top: 2px solid var(--ink-900);
  background: var(--ink-900);
  color: var(--steel);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

/* ---------- 三条业务线 ---------- */
.page-about .about-crew {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-crew__item {
  position: relative;
  padding: 20px 20px 20px 62px;
  border: var(--edge);
  box-shadow: var(--shadow-soft);
  background: var(--paper);
}

.page-about .about-crew__no {
  position: absolute;
  left: 18px;
  top: 20px;
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-crew__item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--ink-900);
}

.page-about .about-crew__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
}

/* ---------- 频道图谱（深色块） ---------- */
.page-about .about-channels {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4vw, 44px) clamp(18px, 3.6vw, 42px);
  background: var(--ink-900);
  color: var(--ice-100);
  border: var(--edge);
  box-shadow: var(--shadow-hard);
}

.page-about .about-channels::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(0deg, rgba(233, 238, 245, 0.055) 0 1px, transparent 1px 8px);
}

.page-about .about-channels > * {
  position: relative;
}

.page-about .about-channels .about-sec__head {
  border-bottom-color: rgba(233, 238, 245, 0.28);
}

.page-about .about-channels .about-sec__title {
  color: var(--paper);
}

.page-about .about-channels .about-sec__lead {
  color: var(--about-dim);
}

.page-about .about-map {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 18px;
}

.page-about .about-map__ch {
  min-width: 0;
  padding-top: 12px;
  border-top: 2px solid rgba(22, 224, 168, 0.45);
}

.page-about .about-map__name {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-about .about-map__name::before {
  content: "";
  width: 8px;
  height: 8px;
  background: var(--orange);
  transform: rotate(45deg);
  flex: none;
}

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

.page-about .about-map__tags li {
  margin: 0 6px 6px 0;
  padding: 4px 9px;
  border: 1px solid rgba(131, 148, 171, 0.45);
  border-radius: 0 4px 4px 4px;
  background: var(--ink-800);
  color: var(--about-lead);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  cursor: default;
  transition: transform 0.16s ease, border-color 0.16s ease, color 0.16s ease, background 0.16s ease;
}

.page-about .about-map__tags li:hover {
  transform: translateY(-3px);
  border-color: var(--mint);
  background: rgba(22, 224, 168, 0.1);
  color: var(--mint);
}

/* ---------- 年度四轮 ---------- */
.page-about .about-rounds {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-rounds__item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 16px 18px;
  background: var(--paper);
  border: var(--edge);
  border-left: 6px solid var(--orange);
}

.page-about .about-rounds__item--mint { border-left-color: var(--mint); }
.page-about .about-rounds__item--violet { border-left-color: var(--violet); }

.page-about .about-rounds__no {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--steel);
  padding-top: 3px;
}

.page-about .about-rounds__item h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink-900);
}

.page-about .about-rounds__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
}

/* ---------- 数据源与合作 ---------- */
.page-about .about-src {
  display: grid;
  gap: 0;
  margin: 0 0 20px;
  border-top: 2px solid var(--ink-900);
}

.page-about .about-src__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid rgba(131, 148, 171, 0.5);
}

.page-about .about-src dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mint-ink);
}

.page-about .about-src dd {
  margin: 0;
  max-width: 720px;
  font-size: 15px;
  line-height: 1.76;
  color: var(--slate);
}

/* ---------- 更新时效 ---------- */
.page-about .about-promise {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-promise li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 16px 18px;
  background: var(--paper);
  border: var(--edge);
  box-shadow: var(--shadow-soft);
}

.page-about .about-promise__time {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.4vw, 30px);
  font-weight: 700;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
  color: var(--orange);
}

.page-about .about-promise__text {
  font-size: 15px;
  line-height: 1.72;
  color: var(--slate);
}

/* ---------- 结尾 ---------- */
.page-about .about-next {
  padding: clamp(22px, 3.6vw, 34px);
  background: var(--ink-800);
  border: var(--edge);
  box-shadow: var(--shadow-hard);
  color: var(--ice-100);
}

.page-about .about-next h2 {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: clamp(20px, 2.8vw, 28px);
  font-weight: 600;
  line-height: 1.3;
  color: var(--paper);
}

.page-about .about-next p {
  margin: 0 0 20px;
  max-width: 640px;
  font-size: 15px;
  line-height: 1.76;
  color: var(--about-dim);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 22px;
}

.page-about .about-next__link {
  color: var(--mint);
  font-size: 14px;
  text-decoration: none;
  border-bottom: 1px solid rgba(22, 224, 168, 0.45);
  padding-bottom: 2px;
}

.page-about .about-next__link:hover {
  color: var(--paper);
  border-bottom-color: var(--paper);
}

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

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

  .page-about .about-src__row {
    grid-template-columns: 160px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }

  .page-about .about-promise li {
    grid-template-columns: minmax(140px, 200px) minmax(0, 1fr);
    align-items: baseline;
    gap: 18px;
  }

  .page-about .about-crew__item:nth-child(2) { margin-left: 30px; }
  .page-about .about-crew__item:nth-child(3) { margin-left: 15px; }
}

@media (min-width: 1024px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
  }

  .page-about .about-rail {
    margin-bottom: 0;
  }

  .page-about .about-rail__inner {
    position: sticky;
    top: 96px;
  }

  .page-about .about-toc__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-toc__list li {
    margin-bottom: 4px;
  }

  .page-about .about-toc__list a {
    border: 0;
    border-left: 3px solid transparent;
    background: transparent;
    padding: 8px 10px 8px 9px;
    white-space: normal;
  }

  .page-about .about-toc__list a:hover {
    background: var(--paper);
    border-left-color: var(--steel);
  }

  .page-about .about-toc__list a[aria-current="true"] {
    background: var(--paper);
    border-left-color: var(--orange);
    color: var(--ink-900);
  }

  .page-about .about-toc__list a[aria-current="true"] span {
    color: var(--orange);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-map__tags li,
  .page-about .about-toc__list a {
    transition: none;
  }

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