.page-about {
  font-family: var(--font-body);
  color: var(--mist);
  background: var(--ink);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .about-shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.page-about .breadcrumb {
  padding-block: 18px 0;
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--line);
}

.page-about .breadcrumb__link {
  color: var(--muted);
  text-decoration: none;
}

.page-about .breadcrumb__link:hover {
  color: var(--lime);
}

/* 首屏拼贴 */
.page-about .about-hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 5vw, 56px);
  padding-block: clamp(28px, 5vw, 64px) clamp(28px, 4vw, 48px);
  align-items: end;
}

.page-about .eyebrow {
  display: inline-block;
  margin: 0;
  font-size: 11px;
  letter-spacing: .22em;
  color: var(--lime);
  text-transform: uppercase;
}

.page-about h1 {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(38px, 7vw, 76px);
  line-height: .98;
  letter-spacing: -.01em;
  color: var(--mist);
}

.page-about .about-lead {
  margin: clamp(18px, 3vw, 26px) 0 0;
  max-width: 33em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-2);
  position: relative;
  overflow: hidden;
}

.page-about .about-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(69, 214, 190, .10) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(69, 214, 190, .10) 1px, transparent 1px);
  background-size: 44px 44px;
  opacity: .5;
}

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

.page-about .about-figure--hero img {
  aspect-ratio: 4 / 3;
}

.page-about .about-figure--board img {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure--stand img {
  aspect-ratio: 9 / 11;
}

.page-about .about-figure__cap {
  display: block;
  padding: 10px 12px;
  border-top: 1px solid var(--line);
  font-size: 11px;
  letter-spacing: .04em;
  color: var(--muted);
  background: var(--ink-2);
  position: relative;
  z-index: 1;
}

/* 概览数据条 */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(16px, 3vw, 24px) clamp(12px, 2vw, 20px);
  border-right: 1px solid var(--line);
}

.page-about .about-stat:nth-child(2n) {
  border-right: 0;
}

.page-about .about-stat:nth-child(n + 3) {
  border-top: 1px solid var(--line);
}

.page-about .about-stat__num {
  font-size: clamp(26px, 4vw, 38px);
  line-height: 1;
  color: var(--lime);
  letter-spacing: -.02em;
}

.page-about .about-stat__unit {
  font-size: .55em;
  margin-left: 2px;
  color: var(--lime-deep);
}

.page-about .about-stat__label {
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

/* 主体：章节索引 + 长卷 */
.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  padding-top: clamp(24px, 4vw, 48px);
}

.page-about .about-toc {
  padding-bottom: 14px;
  margin-bottom: 8px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-toc__title {
  margin: 0 0 10px;
  font-size: 10px;
  letter-spacing: .2em;
  color: var(--muted);
}

.page-about .about-toc__list {
  display: flex;
  gap: 10px;
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .about-toc__item {
  flex: 0 0 auto;
}

.page-about .about-toc__link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color .18s ease, border-color .18s ease, background-color .18s ease;
}

.page-about .about-toc__no {
  font-size: 10px;
  color: var(--line);
  transition: color .18s ease;
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link.is-current {
  color: var(--ink);
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .about-toc__link:hover .about-toc__no,
.page-about .about-toc__link.is-current .about-toc__no {
  color: var(--ink);
}

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

.page-about .about-section {
  padding-block: clamp(34px, 6vw, 76px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-no {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--teal);
}

.page-about .about-h2 {
  margin: 0 0 clamp(16px, 2.4vw, 24px);
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(26px, 4.6vw, 44px);
  line-height: 1.06;
  letter-spacing: -.005em;
  color: var(--mist);
}

.page-about .about-prose p {
  margin: 0 0 16px;
  max-width: 33em;
  font-size: clamp(14px, 1.5vw, 16px);
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-prose--tight {
  margin-bottom: 8px;
  color: var(--muted);
}

.page-about .about-pullquote {
  margin-top: clamp(22px, 3vw, 34px);
  padding: 18px 20px;
  border-left: 2px solid var(--lime);
  background: var(--ink-2);
}

.page-about .about-pullquote p {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(18px, 2.6vw, 24px);
  line-height: 1.5;
  color: var(--lime);
}

/* 时间线 */
.page-about .about-tl {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0 0 0 24px;
  position: relative;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--lime), var(--line) 26%, var(--line));
}

.page-about .about-node {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding-block: clamp(18px, 3vw, 30px);
  border-top: 1px solid var(--line);
}

.page-about .about-node:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -24px;
  margin-left: -4px;
  top: clamp(20px, 3.2vw, 32px);
  width: 9px;
  height: 9px;
  background: var(--ink);
  border: 1px solid var(--lime-deep);
}

.page-about .about-node:first-child::before {
  top: 4px;
}

.page-about .about-node.is-now::before {
  background: var(--lime);
  border-color: var(--lime);
}

.page-about .about-node__year {
  font-size: clamp(40px, 8vw, 76px);
  line-height: .85;
  letter-spacing: -.03em;
  color: var(--line);
  -webkit-text-stroke: 1px var(--line);
}

.page-about .about-node.is-now .about-node__year {
  color: var(--lime);
  -webkit-text-stroke: 0;
}

.page-about .about-node__kicker {
  margin: 0 0 6px;
  font-size: 10px;
  letter-spacing: .22em;
  color: var(--amber);
  text-transform: uppercase;
}

.page-about .about-node__h {
  margin: 0 0 8px;
  font-size: clamp(17px, 2.2vw, 21px);
  font-weight: 500;
  line-height: 1.4;
  color: var(--mist);
}

.page-about .about-node__body p:not(.about-node__kicker) {
  margin: 0;
  max-width: 32em;
  font-size: clamp(14px, 1.5vw, 16px);
  line-height: 1.85;
  color: var(--muted);
}

/* 团队 */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 4vw, 44px);
  align-items: start;
}

.page-about .about-team .about-prose p,
.page-about .about-team__text p {
  margin: 0 0 16px;
  max-width: 33em;
  font-size: clamp(14px, 1.5vw, 16px);
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-team__chart {
  border: 1px solid var(--line);
  background: var(--ink-2);
  padding: clamp(16px, 3vw, 24px);
}

.page-about .about-chart__title {
  margin: 0 0 14px;
  font-size: 10px;
  letter-spacing: .2em;
  color: var(--muted);
}

.page-about .about-bars {
  display: grid;
  gap: 14px;
}

.page-about .about-bar__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 6px;
}

.page-about .about-bar__name {
  font-size: 13px;
  color: var(--mist);
}

.page-about .about-bar__val {
  font-size: 12px;
  color: var(--muted);
}

.page-about .about-bar__track {
  display: block;
  height: 8px;
  background: var(--ink);
  border: 1px solid var(--line);
}

.page-about .about-bar__fill {
  display: block;
  height: 100%;
  background: var(--lime);
}

.page-about .about-bar__fill--edit { width: 50%; background: var(--lime); }
.page-about .about-bar__fill--check { width: 25%; background: var(--teal); }
.page-about .about-bar__fill--prod { width: 25%; background: var(--amber); }

.page-about .about-team__chart .about-figure {
  margin-top: clamp(18px, 3vw, 26px);
}

/* 服务范围 */
.page-about .about-coverage {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 4vw, 44px);
  align-items: start;
}

.page-about .about-coverage__text p {
  margin: 0 0 16px;
  max-width: 33em;
  font-size: clamp(14px, 1.5vw, 16px);
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-cities {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
}

.page-about .about-cities li {
  padding: 5px 10px;
  border: 1px solid var(--line);
  font-size: 12px;
  color: var(--muted);
  letter-spacing: .02em;
}

.page-about .about-cities li:nth-child(1),
.page-about .about-cities li:nth-child(2) {
  border-color: var(--lime-deep);
  color: var(--lime);
}

.page-about .about-link-row {
  margin-top: 6px;
  margin-bottom: 0;
}

/* 原则 */
.page-about .about-principles {
  margin: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-principle {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding-block: clamp(18px, 3vw, 26px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-principle dt {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(20px, 3vw, 28px);
  line-height: 1.2;
  color: var(--mist);
}

.page-about .about-principle__no {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--teal);
}

.page-about .about-principle dd {
  margin: 0;
  max-width: 34em;
  font-size: clamp(14px, 1.5vw, 16px);
  line-height: 1.85;
  color: var(--muted);
}

/* 结尾行动区 */
.page-about .about-cta {
  margin-top: clamp(30px, 5vw, 56px);
  padding: clamp(22px, 4vw, 40px);
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--lime);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 3vw, 28px);
}

.page-about .about-cta__text p {
  margin: 0;
  max-width: 34em;
  font-size: clamp(14px, 1.5vw, 16px);
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.page-about .about-top {
  margin: clamp(22px, 3vw, 34px) 0 0;
  font-size: 12px;
  letter-spacing: .06em;
}

.page-about .about-top a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid var(--line);
  padding-bottom: 2px;
}

.page-about .about-top a:hover {
  color: var(--lime);
  border-color: var(--lime);
}

/* 桌面布局 */
@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-stat {
    border-top: 0;
  }

  .page-about .about-stat:nth-child(2n) {
    border-right: 1px solid var(--line);
  }

  .page-about .about-stat:last-child {
    border-right: 0;
  }

  .page-about .about-node {
    grid-template-columns: 160px minmax(0, 1fr);
    gap: clamp(16px, 3vw, 40px);
    align-items: start;
  }

  .page-about .about-principle {
    grid-template-columns: minmax(180px, 260px) minmax(0, 1fr);
    gap: clamp(16px, 3vw, 40px);
    align-items: baseline;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-hero__text {
    padding-bottom: 8px;
  }

  .page-about .about-layout {
    grid-template-columns: minmax(170px, 220px) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 64px);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: 92px;
    border-bottom: 0;
    border-left: 1px solid var(--line);
    padding: 0 0 0 16px;
    margin-bottom: 0;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-toc__link {
    display: flex;
    width: 100%;
    padding: 8px 4px;
    border: 0;
    border-bottom: 1px solid transparent;
    white-space: normal;
  }

  .page-about .about-toc__link:hover,
  .page-about .about-toc__link.is-current {
    background: transparent;
    color: var(--lime);
    border-bottom-color: var(--lime);
  }

  .page-about .about-toc__link:hover .about-toc__no,
  .page-about .about-toc__link.is-current .about-toc__no {
    color: var(--lime);
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }

  .page-about .about-coverage {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1200px) {
  .page-about .about-node {
    grid-template-columns: 200px minmax(0, 1fr);
  }
}

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