.page-about {
  --about-idx-w: 170px;
  --about-gap: clamp(26px, 4.6vw, 64px);
  background-color: var(--cream);
  background-image:
    linear-gradient(to right, rgba(143, 163, 176, 0.08) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(143, 163, 176, 0.08) 1px, transparent 1px);
  background-size: 30px 30px;
  color: var(--ink-brown);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.78;
  overflow-x: hidden;
}

.page-about .about-wrap {
  width: 100%;
  max-width: var(--wrap-wide);
  margin-inline: auto;
  padding: clamp(20px, 3.4vw, 44px) var(--gutter) clamp(48px, 7vw, 104px);
}

.page-about .about-crumbs {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: clamp(20px, 3vw, 32px);
}

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

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  padding-bottom: clamp(30px, 4.4vw, 56px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(30px, 6.2vw, 58px);
  line-height: 1.16;
  letter-spacing: -0.02em;
  margin: 10px 0 0;
  color: var(--ink-deep);
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 56ch;
  font-size: clamp(15px, 1.05vw, 17px);
  color: #3A2F27;
}

.page-about .about-hero__act {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 22px;
  margin-top: 26px;
}

.page-about .about-hero__link {
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--celadon);
  padding-bottom: 2px;
}

.page-about .about-hero__link:hover,
.page-about .about-hero__link:focus-visible {
  color: var(--celadon);
}

.page-about .about-hero__panel {
  background: var(--ink-deep);
  color: var(--cream);
  border: 1px solid rgba(217, 154, 43, 0.42);
  border-radius: var(--radius);
  padding: clamp(20px, 3vw, 30px);
}

.page-about .about-hero__panel-title {
  margin: 0 0 16px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--amber-soft);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--rail-line);
}

.page-about .about-metrics {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px 16px;
}

.page-about .about-metrics__item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0 4px;
}

.page-about .about-metrics__num {
  font-size: clamp(24px, 3.4vw, 32px);
  font-weight: 700;
  color: var(--amber);
  line-height: 1.1;
}

.page-about .about-metrics__unit {
  font-family: var(--font-head);
  font-size: 12px;
  color: var(--amber-soft);
}

.page-about .about-metrics__label {
  flex-basis: 100%;
  margin-top: 4px;
  font-family: var(--font-head);
  font-size: 12px;
  line-height: 1.5;
  color: var(--rail-text);
}

.page-about .about-hero__panel-foot {
  margin: 20px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--rail-line);
  font-family: var(--font-head);
  font-size: 12px;
  line-height: 1.6;
  color: var(--celadon-soft);
}

/* ---------- 主体：年份索引 + 内容流 ---------- */
.page-about .about-body {
  display: grid;
  gap: var(--about-gap);
  padding-top: clamp(30px, 4.6vw, 64px);
}

.page-about .about-index__title {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 10px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

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

.page-about .about-index__link {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 124px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.55);
  text-decoration: none;
  color: var(--ink-brown);
  transition: border-color 160ms ease, background 160ms ease;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  border-color: var(--amber);
  background: #FFFFFF;
}

.page-about .about-index__year {
  font-size: 15px;
  font-weight: 700;
  color: var(--amber);
  letter-spacing: 0.02em;
}

.page-about .about-index__label {
  font-family: var(--font-head);
  font-size: 12px;
  line-height: 1.45;
  color: var(--muted);
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding-block: clamp(26px, 3.6vw, 44px);
  border-top: 1px solid var(--line);
  scroll-margin-top: calc(var(--topbar-h) + 20px);
}

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

.page-about .about-sec__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 16px;
}

.page-about .about-sec__num {
  font-size: clamp(15px, 1.6vw, 19px);
  font-weight: 700;
  color: var(--amber);
  letter-spacing: 0.04em;
  flex: 0 0 auto;
  padding-top: 4px;
}

.page-about .about-sec h2 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(22px, 3.1vw, 34px);
  line-height: 1.28;
  letter-spacing: -0.015em;
  margin: 0;
  color: var(--ink-deep);
}

.page-about .about-sec__lede {
  margin: 0 0 22px;
  max-width: 62ch;
  color: #3A2F27;
}

.page-about .about-prose p {
  margin: 0 0 14px;
}

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

.page-about .about-split {
  display: grid;
  gap: clamp(18px, 2.6vw, 32px);
}

/* ---------- 配图 ---------- */
.page-about .about-fig {
  margin: 0;
  padding: 7px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
}

.page-about .about-fig img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: 1px;
}

.page-about .about-fig--wide {
  margin-top: clamp(18px, 2.6vw, 28px);
}

.page-about .about-fig--wide img {
  aspect-ratio: 2 / 1;
}

.page-about .about-fig__cap {
  display: block;
  padding: 7px 2px 1px;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--muted);
  text-align: right;
}

/* ---------- 工序条 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 0 0 clamp(20px, 2.8vw, 30px);
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-steps__item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  background: rgba(168, 201, 188, 0.22);
  border-left: 2px solid var(--celadon);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-family: var(--font-head);
  font-size: 14px;
  color: var(--ink-deep);
}

.page-about .about-steps__no {
  font-size: 11px;
  color: var(--celadon);
  letter-spacing: 0.08em;
}

/* ---------- 原则卡 ---------- */
.page-about .about-cards {
  display: grid;
  gap: 14px;
}

.page-about .about-card {
  padding: 20px 18px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.page-about .about-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-soft);
  border-color: var(--amber);
}

.page-about .about-card__no {
  margin: 0 0 6px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .about-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--ink-deep);
}

.page-about .about-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: #3A2F27;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 4px 0 4px 22px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: var(--line);
}

.page-about .about-timeline li {
  position: relative;
  padding: 0 0 20px;
  scroll-margin-top: calc(var(--topbar-h) + 20px);
}

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

.page-about .about-timeline li::before {
  content: "";
  position: absolute;
  left: -23px;
  top: 9px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 0 3px var(--cream);
}

.page-about .about-timeline li:target::before {
  background: var(--brick);
}

.page-about .about-timeline__year {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--amber);
  letter-spacing: 0.04em;
}

.page-about .about-timeline li:target .about-timeline__year {
  color: var(--brick);
}

.page-about .about-timeline__text {
  margin: 4px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: #3A2F27;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 16px;
}

.page-about .about-team__block {
  padding-left: 16px;
  border-left: 1px solid var(--celadon);
}

.page-about .about-team__title {
  margin: 0 0 6px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--celadon);
}

.page-about .about-team__block p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: #3A2F27;
}

/* ---------- 资质 ---------- */
.page-about .about-certs {
  display: grid;
  gap: 14px;
}

.page-about .about-certs__item {
  padding: 20px 18px;
  background: rgba(168, 201, 188, 0.26);
  border: 1px solid var(--celadon);
  border-radius: var(--radius);
}

.page-about .about-certs__tag {
  margin: 0 0 8px;
  display: inline-block;
  padding: 2px 8px;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink-deep);
  background: var(--celadon-soft);
  border-radius: 2px;
}

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

.page-about .about-certs__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: #2C241D;
}

/* ---------- 规模（深色区） ---------- */
.page-about .about-sec--scale {
  border-top: 1px solid var(--line);
}

.page-about .about-scale {
  background: var(--ink-deep);
  color: var(--cream);
  border-radius: var(--radius);
  padding: clamp(24px, 3.6vw, 42px);
}

.page-about .about-scale__num {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--amber);
  margin-bottom: 10px;
}

.page-about .about-scale h2 {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(22px, 3.1vw, 32px);
  line-height: 1.3;
  letter-spacing: -0.015em;
  margin: 0 0 12px;
  color: var(--paper);
}

.page-about .about-scale__lede {
  margin: 0 0 24px;
  max-width: 56ch;
  font-size: 15px;
  color: var(--rail-text);
}

.page-about .about-scale__grid {
  list-style: none;
  margin: 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--rail-line);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px 16px;
}

.page-about .about-scale__grid li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0 4px;
}

.page-about .about-scale__val {
  font-size: clamp(24px, 3.6vw, 34px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--amber);
}

.page-about .about-scale__unit {
  font-family: var(--font-head);
  font-size: 12px;
  color: var(--amber-soft);
}

.page-about .about-scale__key {
  flex-basis: 100%;
  margin-top: 5px;
  font-family: var(--font-head);
  font-size: 12px;
  line-height: 1.5;
  color: var(--rail-text);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  margin-top: clamp(26px, 3.6vw, 44px);
  padding: clamp(24px, 3.4vw, 38px);
  border: 1px solid var(--line);
  border-top: 3px solid var(--amber);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.62);
}

.page-about .about-cta__title {
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(20px, 2.6vw, 27px);
  line-height: 1.32;
  letter-spacing: -0.01em;
  margin: 0 0 10px;
  color: var(--ink-deep);
}

.page-about .about-cta__text {
  margin: 0 0 20px;
  max-width: 60ch;
  font-size: 15px;
  color: #3A2F27;
}

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

.page-about .about-cta__link {
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 600;
  color: var(--celadon);
  text-decoration: none;
  border-bottom: 1px solid var(--celadon-soft);
  padding-bottom: 2px;
}

.page-about .about-cta__link:hover,
.page-about .about-cta__link:focus-visible {
  color: var(--ink-deep);
  border-bottom-color: var(--amber);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-steps {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 8px;
  }

  .page-about .about-steps__item {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding: 14px 12px;
    border-left: 0;
    border-top: 2px solid var(--celadon);
    border-radius: 0 0 var(--radius) var(--radius);
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }

  .page-about .about-split--rev {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  }

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

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

  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 26px;
  }

  .page-about .about-scale__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .about-hero__panel {
    align-self: stretch;
  }
}

@media (min-width: 980px) {
  .page-about .about-body {
    grid-template-columns: var(--about-idx-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--topbar-h) + 28px);
  }

  .page-about .about-index__list {
    display: block;
    overflow: visible;
    padding: 0 0 0 12px;
    border-left: 1px solid var(--line);
    gap: 0;
  }

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

  .page-about .about-index__link {
    min-width: 0;
    border: 0;
    border-radius: 0;
    background: none;
    padding: 7px 6px 7px 10px;
    position: relative;
  }

  .page-about .about-index__link::before {
    content: "";
    position: absolute;
    left: -13px;
    top: 15px;
    width: 8px;
    height: 1px;
    background: var(--line);
    transition: width 160ms ease, background 160ms ease;
  }

  .page-about .about-index__link:hover::before,
  .page-about .about-index__link:focus-visible::before {
    width: 13px;
    background: var(--amber);
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    background: rgba(217, 154, 43, 0.1);
  }

  .page-about .about-index__year {
    font-size: 17px;
  }

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

  .page-about .about-sec__head {
    gap: 18px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__panel {
    padding: 34px 32px;
  }

  .page-about .about-metrics {
    gap: 26px 20px;
  }
}

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

  .page-about .about-card:hover {
    transform: none;
  }
}
<<<PAGE_CSS_END>>>