.page-about {
  --about-axis: 232px;
  background: var(--sand);
  color: var(--slate);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background:
    radial-gradient(circle at 84% 14%, rgba(12, 124, 124, .30), transparent 46%),
    radial-gradient(circle at 6% 88%, rgba(201, 59, 18, .22), transparent 42%),
    var(--ink-950);
  color: var(--white);
  padding: calc(var(--header-h) + 28px) 0 48px;
  overflow: hidden;
}

.page-about .about-hero__crumb .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 26px;
  padding: 0;
  list-style: none;
  font-family: var(--font-label);
  font-size: .74rem;
  letter-spacing: .04em;
  color: var(--mist);
}

.page-about .about-hero__crumb .breadcrumb__list li::after {
  content: "/";
  margin-left: 8px;
  color: var(--ink-600);
}

.page-about .about-hero__crumb .breadcrumb__list li:last-child::after {
  content: none;
}

.page-about .about-hero__crumb .breadcrumb__list a {
  color: var(--sand);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--ease), color var(--ease);
}

.page-about .about-hero__crumb .breadcrumb__list a:hover {
  color: var(--white);
  border-bottom-color: var(--orange-bright);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 34px;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 18px;
  font-family: var(--font-label);
  font-size: .76rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--orange-bright);
}

.page-about .about-hero__title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 6vw, 3.5rem);
  line-height: 1.08;
  letter-spacing: -.015em;
  color: var(--white);
}

.page-about .about-hero__desc {
  margin: 0 0 28px;
  max-width: 56ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__art {
  display: flex;
  justify-content: center;
}

.page-about .about-hero__svg {
  width: min(100%, 320px);
  height: auto;
  display: block;
}

/* ---------- 正文骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: 8px;
  padding-block: 36px 64px;
}

.page-about .about-axis {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 12px;
  margin-bottom: 12px;
  border-bottom: 2px solid var(--sand-deep);
  scrollbar-width: none;
}

.page-about .about-axis::-webkit-scrollbar {
  display: none;
}

.page-about .about-axis__label {
  display: none;
}

.page-about .about-axis .axis-link {
  flex: 0 0 auto;
  padding: 8px 12px;
  border: 2px solid var(--sand-deep);
  border-radius: var(--radius);
  background: var(--white);
  font-family: var(--font-label);
  font-size: .74rem;
  letter-spacing: .04em;
  color: var(--slate);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--ease), border-color var(--ease), background var(--ease);
}

.page-about .about-axis .axis-link:hover {
  border-color: var(--ink-950);
  color: var(--ink-950);
}

.page-about .about-axis .axis-link.is-current {
  background: var(--ink-950);
  border-color: var(--ink-950);
  color: var(--sand);
}

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding-block: 34px 40px;
  border-top: 2px solid var(--ink-950);
}

.page-about .about-sec:first-child {
  border-top: 0;
  padding-top: 12px;
}

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

.page-about .about-sec .index-num {
  font-family: var(--font-label);
  font-size: .82rem;
  font-weight: 600;
  letter-spacing: .08em;
  color: var(--orange);
}

.page-about .about-sec__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.4rem, 4vw, 2.15rem);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--ink-950);
}

.page-about .about-sec__lead {
  margin: 0 0 26px;
  max-width: 68ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--slate);
}

.page-about .about-sec__note {
  margin: 18px 0 24px;
  max-width: 62ch;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--ink-600);
}

.page-about .about-sec--sand {
  background: var(--white);
  border: 2px solid var(--ink-950);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard);
  padding: 30px 22px 34px;
  margin-block: 12px;
}

.page-about .about-sec--ink {
  background: var(--ink-950);
  border: 2px solid var(--ink-950);
  border-radius: var(--radius);
  padding: 30px 22px 34px;
  margin-top: 12px;
}

.page-about .about-sec--ink .about-sec__title,
.page-about .about-sec--ink .about-timeline__title {
  color: var(--white);
}

.page-about .about-sec--ink .about-sec__lead,
.page-about .about-sec--ink .about-timeline__text {
  color: var(--mist);
}

/* ---------- 01 服务对象 ---------- */
.page-about .about-who {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-who__item {
  position: relative;
  background: var(--white);
  border: 2px solid var(--ink-950);
  border-radius: var(--radius);
  padding: 18px 18px 18px 52px;
  box-shadow: 4px 4px 0 var(--sand-deep);
}

.page-about .about-who__num {
  position: absolute;
  top: 18px;
  left: 18px;
  font-family: var(--font-label);
  font-size: .78rem;
  font-weight: 600;
  color: var(--teal);
}

.page-about .about-who__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 800;
  color: var(--ink-950);
}

.page-about .about-who__text {
  margin: 0;
  font-size: .93rem;
  line-height: 1.75;
  color: var(--slate);
}

/* ---------- 02 栏目地图 ---------- */
.page-about .about-map {
  margin: 0 0 24px;
  border: 2px solid var(--ink-950);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-800);
}

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

.page-about .about-nodes {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-node {
  display: flex;
  align-items: stretch;
  gap: 0;
  background: var(--white);
  border: 2px solid var(--ink-950);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform var(--ease), box-shadow var(--ease);
}

.page-about .about-node:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hard);
}

.page-about .about-node__num {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 46px;
  background: var(--ink-950);
  color: var(--sand);
  font-family: var(--font-label);
  font-size: .78rem;
  letter-spacing: .04em;
}

.page-about .about-node__link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  text-decoration: none;
  flex: 1 1 auto;
  min-width: 0;
}

.page-about .about-node__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: .98rem;
  color: var(--ink-950);
}

.page-about .about-node__desc {
  font-size: .88rem;
  line-height: 1.7;
  color: var(--ink-600);
}

/* ---------- 03 案例 ---------- */
.page-about .about-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 8px;
}

.page-about .about-chips .tag {
  font-family: var(--font-label);
  font-size: .76rem;
  letter-spacing: .04em;
  padding: 7px 12px;
  border-radius: 999px;
  border: 2px solid var(--ink-950);
  background: var(--sand);
  color: var(--ink-950);
}

.page-about .about-chips .tag--orange {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--white);
}

.page-about .about-chips .tag--sand {
  background: var(--teal);
  border-color: var(--teal);
  color: var(--white);
}

/* ---------- 04 版本记录 ---------- */
.page-about .about-tracks {
  display: grid;
  gap: 14px;
  margin-bottom: 24px;
}

.page-about .about-track {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  border: 2px solid var(--ink-950);
  border-radius: var(--radius);
  padding: 16px;
  background: var(--white);
}

.page-about .about-track__dot {
  flex: 0 0 12px;
  width: 12px;
  height: 12px;
  margin-top: 5px;
  border-radius: 50%;
  border: 2px solid var(--ink-950);
}

.page-about .about-track--pc .about-track__dot {
  background: var(--orange-bright);
}

.page-about .about-track--ios .about-track__dot {
  background: var(--teal);
}

.page-about .about-track__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: .98rem;
  font-weight: 800;
  color: var(--ink-950);
}

.page-about .about-track__text {
  margin: 0;
  font-size: .9rem;
  line-height: 1.7;
  color: var(--slate);
}

.page-about .about-rhythm {
  margin: 0 0 26px;
  padding: 0;
  list-style: none;
  border-top: 2px solid var(--sand-deep);
}

.page-about .about-rhythm__item {
  padding: 12px 0;
  border-bottom: 2px solid var(--sand-deep);
  font-size: .93rem;
  line-height: 1.75;
  color: var(--slate);
}

.page-about .about-rhythm__item strong {
  display: inline-block;
  min-width: 62px;
  font-family: var(--font-label);
  font-size: .8rem;
  letter-spacing: .04em;
  color: var(--teal);
}

/* ---------- 05 团队 ---------- */
.page-about .about-figure {
  margin: 0 0 24px;
  border: 2px solid var(--ink-950);
  border-radius: var(--radius);
  overflow: hidden;
}

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

.page-about .about-steps {
  display: grid;
  gap: 10px;
  margin-bottom: 24px;
}

.page-about .about-step {
  border: 2px solid var(--ink-950);
  border-radius: var(--radius);
  background: var(--white);
  overflow: hidden;
}

.page-about .about-step__summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-weight: 800;
  color: var(--ink-950);
}

.page-about .about-step__summary::-webkit-details-marker {
  display: none;
}

.page-about .about-step__num {
  font-family: var(--font-label);
  font-size: .76rem;
  letter-spacing: .04em;
  color: var(--orange);
}

.page-about .about-step__name {
  flex: 1 1 auto;
  font-size: .98rem;
}

.page-about .about-step__hint {
  font-family: var(--font-label);
  font-size: .7rem;
  letter-spacing: .06em;
  color: var(--mist);
}

.page-about .about-step[open] .about-step__hint {
  color: var(--teal);
}

.page-about .about-step__body {
  padding: 0 16px 16px;
  border-top: 2px dashed var(--sand-deep);
}

.page-about .about-step__body p {
  margin: 12px 0 0;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .about-support {
  display: grid;
  gap: 14px;
  align-items: start;
  border-left: 6px solid var(--teal);
  background: var(--white);
  padding: 16px 18px;
  border-radius: var(--radius);
}

.page-about .about-support__text {
  margin: 0;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--ink-600);
}

/* ---------- 06 里程碑 ---------- */
.page-about .about-milestone-figure {
  margin: 0 0 24px;
  border: 2px solid var(--ink-600);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-milestone-figure__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  opacity: .92;
}

.page-about .about-timeline {
  position: relative;
  margin: 0 0 28px;
  padding: 0 0 0 22px;
  list-style: none;
  border-left: 2px solid var(--ink-600);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 18px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--orange-bright);
  border: 2px solid var(--ink-950);
}

.page-about .about-timeline__year {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-label);
  font-size: .78rem;
  letter-spacing: .08em;
  color: var(--teal);
}

.page-about .about-timeline__title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: .98rem;
  font-weight: 800;
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: .9rem;
  line-height: 1.75;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  border-top: 2px solid var(--ink-600);
  padding-top: 20px;
}

.page-about .about-stats__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 12px;
  border: 2px solid var(--ink-600);
  border-radius: var(--radius);
  background: var(--ink-800);
}

.page-about .about-stats__num {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 5vw, 2.1rem);
  line-height: 1;
  color: var(--orange-bright);
}

.page-about .about-stats__label {
  font-family: var(--font-label);
  font-size: .72rem;
  line-height: 1.5;
  letter-spacing: .03em;
  color: var(--mist);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: 28px;
  border: 2px solid var(--ink-950);
  border-radius: var(--radius);
  background: var(--sand-deep);
  padding: 28px 22px;
  box-shadow: var(--shadow-hard);
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.3rem, 4vw, 1.95rem);
  line-height: 1.25;
  color: var(--ink-950);
}

.page-about .about-cta__text {
  margin: 0 0 22px;
  max-width: 62ch;
  font-size: .95rem;
  line-height: 1.8;
  color: var(--ink-800);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cta__actions .btn {
  text-decoration: none;
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-about .about-who {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .page-about .about-support {
    grid-template-columns: 1fr auto;
    align-items: center;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .about-hero {
    padding: calc(var(--header-h) + 44px) 0 72px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 320px);
    align-items: center;
    gap: 56px;
  }

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

  .page-about .about-body {
    grid-template-columns: var(--about-axis) minmax(0, 1fr);
    gap: 56px;
    align-items: start;
    padding-block: 56px 88px;
  }

  .page-about .about-axis {
    display: block;
    position: sticky;
    top: calc(var(--header-h) + 28px);
    overflow: visible;
    padding-bottom: 0;
    margin-bottom: 0;
    border-bottom: 0;
    border-left: 2px solid var(--sand-deep);
  }

  .page-about .about-axis__label {
    display: block;
    margin: 0 0 12px -2px;
    padding-left: 14px;
    font-family: var(--font-label);
    font-size: .72rem;
    letter-spacing: .1em;
    text-transform: uppercase;
    color: var(--ink-600);
  }

  .page-about .about-axis .axis-link {
    display: block;
    margin-left: -2px;
    padding: 10px 14px;
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: transparent;
    font-size: .8rem;
    white-space: normal;
  }

  .page-about .about-axis .axis-link:hover {
    background: rgba(11, 27, 43, .05);
    border-left-color: var(--orange-bright);
  }

  .page-about .about-axis .axis-link.is-current {
    background: var(--ink-950);
    border-left-color: var(--orange-bright);
    color: var(--sand);
  }

  .page-about .about-sec {
    padding-block: 44px 52px;
  }

  .page-about .about-sec--sand,
  .page-about .about-sec--ink {
    padding: 38px 36px 42px;
    margin-block: 20px;
  }

  .page-about .about-node__link {
    padding: 18px 20px;
  }

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

  .page-about .about-cta {
    padding: 36px 36px;
    margin-top: 40px;
  }
}
<<<PAGE_CSS_END>>>