.page-about {
  padding-bottom: 72px;
}

.page-about .about-shell {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 26px 0 6px;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 32px;
  line-height: 1.1;
  letter-spacing: -0.012em;
  color: var(--ink);
  margin: 14px 0 16px;
  max-width: 22ch;
}

.page-about .about-hero__lead {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 62ch;
  margin: 0 0 22px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 数据通栏 ---------- */
.page-about .about-stats {
  margin: 30px 0 0;
  padding: 26px 22px 24px;
  border-radius: 3px;
}

.page-about .about-stats__cap {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(247, 245, 239, 0.62);
  margin: 0 0 18px;
}

.page-about .about-stats__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 16px;
}

.page-about .about-stats .stat__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 32px;
  line-height: 1;
  color: var(--warm);
}

.page-about .about-stats .stat__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(247, 245, 239, 0.72);
}

/* ---------- 图片 ---------- */
.page-about .about-frame {
  margin: 30px 0 0;
}

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

.page-about .about-row .about-frame {
  margin: 24px 0 20px;
}

/* ---------- 正文行 ---------- */
.page-about .about-row {
  position: relative;
  padding: 42px 0 36px;
  border-top: 1px solid var(--concrete-lt);
}

.page-about .about-row:first-of-type {
  border-top: 0;
}

.page-about .about-row h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 25px;
  line-height: 1.2;
  letter-spacing: -0.008em;
  color: var(--ink);
  margin: 10px 0 16px;
  max-width: 26ch;
}

.page-about .about-row p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
  max-width: 68ch;
  margin: 0 0 14px;
}

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

.page-about .about-row p a {
  color: var(--green);
  text-decoration: underline;
  text-decoration-color: var(--concrete-lt);
  text-underline-offset: 3px;
}

.page-about .about-row p a:hover {
  color: var(--jade);
  text-decoration-color: var(--jade);
}

.page-about .about-row--last {
  border-bottom: 1px solid var(--concrete-lt);
}

/* ---------- 三级索引 ---------- */
.page-about .about-index {
  margin: 20px 0 0;
  border-top: 1px solid var(--concrete-lt);
  border-bottom: 1px solid var(--concrete-lt);
}

.page-about .about-index__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--concrete-lt);
}

.page-about .about-index__row:last-child {
  border-bottom: 0;
}

.page-about .about-index__key {
  font-family: var(--font-display);
  font-size: 17px;
  letter-spacing: 0.02em;
  color: var(--green);
}

.page-about .about-index__val {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------- 服务范围三列 ---------- */
.page-about .scope {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--concrete-lt);
  border: 1px solid var(--concrete-lt);
  margin: 24px 0 20px;
}

.page-about .scope__col {
  position: relative;
  background: var(--warm);
  padding: 26px 20px 22px;
}

.page-about .scope__col::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--green);
}

.page-about .scope__col--b::before {
  background: var(--jade);
}

.page-about .scope__col--c::before {
  background: var(--indigo);
}

.page-about .scope__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 21px;
  letter-spacing: -0.005em;
  color: var(--ink);
  margin: 0 0 14px;
}

.page-about .scope__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .scope__list li {
  position: relative;
  padding-left: 15px;
  margin-bottom: 10px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-soft);
}

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

.page-about .scope__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 7px;
  height: 1px;
  background: var(--concrete);
}

.page-about .scope__list li a {
  color: var(--green);
  text-decoration: underline;
  text-decoration-color: var(--concrete-lt);
  text-underline-offset: 3px;
}

/* ---------- 运营数据带 ---------- */
.page-about .about-ops {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0 18px;
  padding: 0;
}

.page-about .about-ops li {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  padding: 8px 13px;
  border: 1px solid var(--concrete-lt);
  border-radius: 2px;
  background: rgba(216, 213, 204, 0.28);
  color: var(--ink-soft);
}

/* ---------- 发展历程 ---------- */
.page-about .about-history {
  margin-top: 20px;
  padding: 28px 22px 26px;
  border-radius: 3px;
}

.page-about .about-history__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-history__item {
  position: relative;
  padding: 0 0 26px 24px;
  border-left: 1px solid rgba(247, 245, 239, 0.24);
}

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

.page-about .about-history__item::before {
  content: "";
  position: absolute;
  left: -4.5px;
  top: 6px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--jade);
}

.page-about .about-history__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--jade);
  margin-bottom: 8px;
}

.page-about .about-history__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(247, 245, 239, 0.82);
  max-width: 62ch;
}

/* ---------- 沟通入口 ---------- */
.page-about .about-links {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--concrete-lt);
  border: 1px solid var(--concrete-lt);
  margin: 22px 0 20px;
}

.page-about .about-links__item {
  display: block;
  background: var(--warm);
  padding: 20px 20px 18px;
  border-left: 3px solid var(--wine);
  text-decoration: none;
  transition: background 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .about-links__item:hover {
  background: rgba(216, 213, 204, 0.3);
  border-left-color: var(--green);
}

.page-about .about-links__t {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--ink);
  margin-bottom: 8px;
}

.page-about .about-links__d {
  display: block;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-soft);
}

/* ---------- 中屏 ---------- */
@media (min-width: 700px) {
  .page-about .about-shell {
    padding: 0 24px;
  }

  .page-about .about-hero {
    padding-top: 34px;
  }

  .page-about .about-hero h1 {
    font-size: 44px;
    max-width: 20ch;
  }

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

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

  .page-about .about-stats .stat__num {
    font-size: 38px;
  }

  .page-about .about-index__row {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }

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

  .page-about .about-row h2 {
    font-size: 33px;
    max-width: 24ch;
  }

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

  .page-about .about-frame--lead {
    margin-left: 6%;
  }
}

/* ---------- 宽屏：左侧轨道式时间轴 ---------- */
@media (min-width: 960px) {
  .page-about .about-shell {
    position: relative;
    padding-left: 116px;
    padding-right: 28px;
  }

  .page-about .about-shell::before {
    content: "";
    position: absolute;
    left: 88px;
    top: 0;
    bottom: 0;
    width: 1px;
    background: linear-gradient(
      180deg,
      transparent 0,
      var(--concrete-lt) 5%,
      var(--concrete-lt) 95%,
      transparent 100%
    );
  }

  .page-about .about-row::before {
    content: "";
    position: absolute;
    left: -33px;
    top: 50px;
    width: 11px;
    height: 11px;
    border-radius: 50%;
    background: var(--concrete-lt);
    box-shadow: 0 0 0 4px var(--warm);
    transition: background 0.4s var(--ease), transform 0.4s var(--ease);
  }

  .page-about .about-row.is-in::before {
    background: var(--green);
  }

  .page-about .about-row:hover::before {
    transform: scale(1.15);
  }

  .page-about .about-hero {
    padding-top: 44px;
  }

  .page-about .about-hero h1 {
    font-size: 54px;
  }

  .page-about .about-row {
    padding: 52px 0 44px;
  }

  .page-about .about-row h2 {
    font-size: 36px;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-row::before,
  .page-about .about-links__item {
    transition: none;
  }

  .page-about .about-row:hover::before {
    transform: none;
  }
}