.page-about {
  --about-rail: 236px;
  --about-line: var(--grid-line);
  background: var(--cloud);
  color: var(--ink);
  font-family: var(--sans);
  overflow-x: clip;
}

.page-about .breadcrumb {
  padding-top: 14px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  border-bottom: 1px solid var(--about-line);
  background:
    radial-gradient(90% 130% at 0% 0%, rgba(217, 238, 240, 0.95), rgba(217, 238, 240, 0) 62%),
    radial-gradient(70% 110% at 100% 0%, rgba(231, 210, 178, 0.72), rgba(231, 210, 178, 0) 64%);
}

.page-about .about-hero__frame {
  position: relative;
  padding: clamp(24px, 4vw, 48px) 0 clamp(18px, 3vw, 32px);
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 10px;
  background-image: repeating-linear-gradient(90deg, var(--snow-deep) 0 1px, transparent 1px 14px);
  opacity: 0.55;
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
}

.page-about .about-hero h1 {
  font-family: var(--serif);
  font-weight: 900;
  letter-spacing: -0.02em;
  font-size: clamp(30px, 6.2vw, 58px);
  line-height: 1.14;
  margin: 12px 0 0;
  max-width: 18em;
  color: var(--ink);
}

.page-about .about-hero .lede {
  margin: 16px 0 0;
  max-width: 40em;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.75;
  color: #2c4450;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-hero__stats li {
  background: rgba(247, 250, 249, 0.86);
  padding: 14px 16px;
  display: grid;
  gap: 4px;
}

.page-about .about-hero__num {
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 600;
  color: var(--data);
  line-height: 1.1;
  border-bottom: 2px solid var(--signal);
  justify-self: start;
  padding-bottom: 2px;
}

.page-about .about-hero__cap {
  font-size: 13px;
  line-height: 1.5;
  color: #3a525d;
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  padding: clamp(28px, 4.5vw, 60px) 0 clamp(40px, 6vw, 80px);
}

.page-about .about-index {
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
  padding: 12px 0 10px;
}

.page-about .about-index__title {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--sand-deep);
}

.page-about .about-index .toc-list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index .toc-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 8px 12px;
  border: 1px solid var(--about-line);
  background: var(--cloud);
  color: var(--ink);
  font-size: 14px;
  text-decoration: none;
  transition: background 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}

.page-about .about-index .toc-link .mono {
  font-size: 11px;
  color: var(--snow-deep);
}

.page-about .about-index .toc-link:hover,
.page-about .about-index .toc-link:focus-visible {
  background: var(--snow);
  border-color: var(--snow-deep);
}

.page-about .about-index .toc-link[aria-current="true"] {
  background: var(--teal);
  border-color: var(--teal);
  color: var(--cloud);
}

.page-about .about-index .toc-link[aria-current="true"] .mono {
  color: var(--sand);
}

.page-about .about-index__note {
  display: none;
  margin: 12px 0 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: #5b717b;
}

/* ---------- 章节 ---------- */
.page-about .about-chapters {
  display: grid;
  gap: clamp(34px, 5vw, 64px);
  min-width: 0;
}

.page-about .about-chapter {
  padding-top: clamp(18px, 2.5vw, 26px);
  border-top: 1px solid var(--about-line);
  min-width: 0;
}

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

.page-about .about-chapter__num {
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--signal);
  padding: 2px 6px;
  border: 1px solid rgba(240, 90, 36, 0.35);
  background: rgba(240, 90, 36, 0.07);
  flex: none;
}

.page-about .about-chapter .section-title {
  font-family: var(--serif);
  font-weight: 700;
  letter-spacing: -0.01em;
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1.25;
  margin: 0;
}

.page-about .about-chapter__lede {
  margin: 14px 0 0;
  max-width: 42em;
  font-size: 15.5px;
  line-height: 1.75;
  color: #3a525d;
}

.page-about .about-chapter__cols {
  display: grid;
  gap: clamp(18px, 3vw, 30px);
  margin-top: 18px;
}

.page-about .about-chapter__text p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.78;
  color: #223a45;
}

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

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--about-line);
  background: var(--snow);
}

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

.page-about .about-figure .media__caption {
  font-size: 12.5px;
  line-height: 1.5;
  color: #4a626d;
  padding: 8px 10px;
  border-top: 1px solid var(--about-line);
  background: rgba(247, 250, 249, 0.9);
}

/* 使用场景 */
.page-about .about-uses {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-uses li {
  background: var(--cloud);
  padding: 12px 14px;
  display: grid;
  gap: 3px;
}

.page-about .about-uses strong {
  font-size: 15px;
  font-weight: 700;
  color: var(--teal);
}

.page-about .about-uses span {
  font-size: 13.5px;
  line-height: 1.6;
  color: #4a626d;
}

/* 八栏目 */
.page-about .about-columns {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-columns li {
  background: var(--cloud);
  padding: 14px 15px 16px;
  display: grid;
  gap: 6px;
  align-content: start;
}

.page-about .about-columns li .mono {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--snow-deep);
}

.page-about .about-columns h3 {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.page-about .about-columns p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.65;
  color: #4a626d;
}

.page-about .about-columns li:hover {
  background: var(--snow);
}

/* 统计带 */
.page-about .about-metrics {
  margin-top: 20px;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--data);
}

.page-about .about-metrics__cell {
  background: rgba(217, 238, 240, 0.55);
  padding: 14px 15px;
  display: grid;
  gap: 4px;
}

.page-about .about-metrics__num {
  font-size: clamp(21px, 3vw, 28px);
  font-weight: 600;
  color: var(--data);
  line-height: 1.1;
}

.page-about .about-metrics__label {
  font-size: 13px;
  line-height: 1.55;
  color: #36505b;
}

.page-about .about-note {
  margin: 16px 0 0;
  padding: 12px 14px;
  border-left: 2px solid var(--sand-deep);
  background: rgba(231, 210, 178, 0.24);
  font-size: 13.5px;
  line-height: 1.7;
  color: #3d5560;
}

/* 团队 */
.page-about .about-team {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-team__row {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  grid-template-areas:
    "num role"
    "bar bar"
    "desc desc";
  gap: 4px 12px;
  align-items: baseline;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-team__num {
  grid-area: num;
  font-size: 26px;
  line-height: 1;
  font-weight: 600;
  color: var(--signal);
}

.page-about .about-team__role {
  grid-area: role;
  font-size: 15px;
  font-weight: 700;
  color: var(--teal);
}

.page-about .about-team__desc {
  grid-area: desc;
  font-size: 13.5px;
  line-height: 1.6;
  color: #4a626d;
}

.page-about .about-team__bar {
  grid-area: bar;
  display: block;
  height: 3px;
  margin: 6px 0 2px;
  background: linear-gradient(90deg, var(--snow-deep), var(--data));
}

.page-about .about-team__row:nth-child(1) .about-team__bar { width: 39%; }
.page-about .about-team__row:nth-child(2) .about-team__bar { width: 20%; background: linear-gradient(90deg, var(--sand), var(--sand-deep)); }
.page-about .about-team__row:nth-child(3) .about-team__bar { width: 26%; background: linear-gradient(90deg, var(--snow-deep), var(--teal)); }
.page-about .about-team__row:nth-child(4) .about-team__bar { width: 15%; background: linear-gradient(90deg, #f7b39a, var(--signal)); }

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 21px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--snow-deep), var(--data) 45%, var(--signal));
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 20px 56px;
}

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

.page-about .about-timeline__node {
  position: absolute;
  left: 0;
  top: 2px;
  width: 44px;
  height: 26px;
  display: grid;
  place-items: center;
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--cloud);
  background: var(--teal);
  z-index: 1;
}

.page-about .about-timeline__node--current {
  background: var(--signal);
  width: 48px;
  left: -2px;
}

.page-about .about-timeline__card {
  border: 1px solid var(--about-line);
  background: var(--cloud);
  padding: 12px 14px 14px;
  transition: border-color 0.18s ease, box-shadow 0.18s ease, transform 0.18s ease;
}

.page-about .about-timeline__card h3 {
  margin: 0 0 6px;
  font-size: 16.5px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-timeline__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: #3d5560;
}

.page-about .about-timeline__more {
  margin-top: 8px !important;
  font-size: 13px !important;
  color: #5b717b !important;
}

.page-about .about-timeline__item--current .about-timeline__card {
  border-color: rgba(240, 90, 36, 0.55);
  background: linear-gradient(180deg, rgba(240, 90, 36, 0.06), rgba(247, 250, 249, 0.9));
}

/* 合作生态 */
.page-about .about-eco {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-eco li {
  background: rgba(231, 210, 178, 0.22);
  padding: 14px 15px;
  display: grid;
  gap: 4px;
}

.page-about .about-eco__num {
  font-size: clamp(24px, 3.4vw, 32px);
  font-weight: 600;
  line-height: 1;
  color: var(--sand-deep);
  border-bottom: 2px solid var(--data);
  justify-self: start;
  padding-bottom: 3px;
}

.page-about .about-eco__label {
  font-size: 13.5px;
  line-height: 1.55;
  color: #3d5560;
}

/* 服务与地域 */
.page-about .about-promise {
  margin-top: 18px;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-promise__contact {
  background: var(--cloud);
  padding: 18px 16px 20px;
  display: grid;
  gap: 6px;
  align-content: start;
}

.page-about .about-promise__label {
  margin: 10px 0 0;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--sand-deep);
}

.page-about .about-promise__label:first-child {
  margin-top: 0;
}

.page-about .about-copy {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
}

.page-about .about-copy__value {
  font-family: var(--mono);
  font-size: 15px;
  color: var(--data);
  word-break: break-all;
}

.page-about .about-promise__value {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--ink);
}

.page-about .about-promise__tip {
  margin: 12px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--about-line);
  font-size: 13px;
  line-height: 1.7;
  color: #5b717b;
}

.page-about .about-copy .copy-feedback {
  font-size: 12.5px;
  color: var(--teal);
}

.page-about .about-region {
  background: var(--teal);
  color: var(--cloud);
  padding: 18px 16px 22px;
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .about-region__art {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid rgba(247, 250, 249, 0.35);
}

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

.page-about .about-region__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(247, 250, 249, 0.86);
}

/* 下一页 */
.page-about .about-next {
  margin-top: 18px;
  display: grid;
  gap: 12px;
}

.page-about .about-next__card {
  display: grid;
  gap: 6px;
  padding: 16px 15px 18px;
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--snow-deep);
  background: var(--cloud);
  color: var(--ink);
  text-decoration: none;
  transition: border-color 0.18s ease, background 0.18s ease, transform 0.18s ease;
}

.page-about .about-next__card .mono {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--snow-deep);
}

.page-about .about-next__card h3 {
  margin: 0;
  font-size: 16.5px;
  font-weight: 700;
}

.page-about .about-next__card p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.65;
  color: #4a626d;
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  border-left-color: var(--signal);
  background: var(--snow);
  transform: translateY(-2px);
}

/* ---------- 大屏 ---------- */
@media (min-width: 700px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-chapter__cols {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: start;
  }

  .page-about .about-chapter__cols--flip {
    grid-template-columns: minmax(0, 0.88fr) minmax(0, 1.12fr);
  }

  .page-about .about-chapter__cols--flip .about-chapter__text {
    order: 2;
  }

  .page-about .about-chapter__cols--flip .about-figure {
    order: 1;
  }

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

  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px 28px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 92px;
    border-bottom: 0;
    padding: 4px 0 0;
    border-top: 3px solid var(--ink);
  }

  .page-about .about-index .toc-list {
    flex-direction: column;
    overflow: visible;
    gap: 2px;
    padding: 6px 0 0;
  }

  .page-about .about-index .toc-link {
    display: flex;
    width: 100%;
    border: 0;
    border-left: 2px solid transparent;
    background: transparent;
    padding: 8px 10px;
    font-size: 14.5px;
  }

  .page-about .about-index .toc-link:hover,
  .page-about .about-index .toc-link:focus-visible {
    background: rgba(217, 238, 240, 0.7);
  }

  .page-about .about-index .toc-link[aria-current="true"] {
    background: rgba(14, 76, 87, 0.06);
    border-left-color: var(--signal);
    color: var(--teal);
  }

  .page-about .about-index .toc-link[aria-current="true"] .mono {
    color: var(--signal);
  }

  .page-about .about-index__note {
    display: block;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.9fr);
    align-items: end;
  }

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

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

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

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

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

  .page-about .about-team {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 22px;
  }
}

/* 桌面悬停展开时间轴说明 */
@media (hover: hover) and (min-width: 1000px) {
  .page-about .about-timeline__more {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.24s ease, opacity 0.24s ease, margin-top 0.24s ease;
    margin-top: 0 !important;
  }

  .page-about .about-timeline__card:hover .about-timeline__more,
  .page-about .about-timeline__card:focus-within .about-timeline__more,
  .page-about .about-timeline__item--current .about-timeline__more {
    max-height: 6em;
    opacity: 1;
    margin-top: 8px !important;
  }

  .page-about .about-timeline__card:hover {
    border-color: var(--snow-deep);
    box-shadow: 0 10px 24px -18px rgba(16, 34, 43, 0.6);
    transform: translateX(3px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__card,
  .page-about .about-next__card,
  .page-about .about-index .toc-link {
    transition: none;
  }

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