.page-about {
  --about-gap: clamp(20px, 3.2vw, 44px);
  display: block;
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background: var(--blue-900);
  color: var(--mist);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(233, 238, 243, .055) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(233, 238, 243, .055) 1px, transparent 1px);
  background-size: 84px 84px;
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 44px);
  padding-block: clamp(30px, 5vw, 60px) clamp(38px, 6vw, 68px);
}

.page-about .about-hero .breadcrumb__list {
  margin: 0 0 22px;
}

.page-about .about-hero .breadcrumb__link {
  color: rgba(233, 238, 243, .74);
  text-decoration: none;
}

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

.page-about .about-hero .breadcrumb__item {
  color: rgba(233, 238, 243, .52);
}

.page-about .about-hero .eyebrow {
  color: var(--cyan);
}

.page-about .about-hero__title {
  color: var(--mist);
  margin: 14px 0 0;
  max-width: 15em;
}

.page-about .about-hero__lede {
  color: rgba(233, 238, 243, .8);
  margin-top: 18px;
  max-width: 34em;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  margin-top: clamp(26px, 4vw, 38px);
  background: var(--line-invert);
  border-top: 1px solid var(--line-invert);
  border-bottom: 1px solid var(--line-invert);
}

.page-about .about-figures__cell {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  background: var(--blue-900);
}

.page-about .about-figures__num {
  font-size: 24px;
  line-height: 1;
  color: var(--orange);
  letter-spacing: .04em;
}

.page-about .about-figures__label {
  font-size: 12px;
  color: rgba(233, 238, 243, .66);
}

.page-about .about-hero__figure {
  margin: 0;
  border: 1px solid var(--line-invert);
  background: var(--blue-700);
}

.page-about .about-hero__figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-hero__caption {
  font-size: 12px;
  line-height: 1.7;
  color: rgba(233, 238, 243, .6);
  padding: 10px 14px;
  border-top: 1px solid var(--line-invert);
}

/* ---------- 通用标题块 ---------- */
.page-about .about-head {
  max-width: 44em;
  margin-bottom: clamp(22px, 3.4vw, 38px);
}

.page-about .about-head .title-lg {
  margin: 12px 0 0;
}

.page-about .about-head__note {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--graphite);
}

/* ---------- 起点 ---------- */
.page-about .about-origin__grid {
  align-items: start;
  gap: var(--about-gap);
}

.page-about .about-origin__main .title-md {
  margin: 12px 0 18px;
}

.page-about .about-origin__main p {
  margin: 0 0 16px;
  max-width: 36em;
}

.page-about .about-origin__aside {
  padding: 22px 22px 24px;
  background: var(--paper);
  border-left: 4px solid var(--orange);
}

.page-about .about-origin__aside-title {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--orange-deep);
}

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

.page-about .about-origin__list li {
  position: relative;
  padding: 10px 0 10px 20px;
  font-size: 15px;
  line-height: 1.7;
  border-top: 1px solid var(--line-soft);
}

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

.page-about .about-origin__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  width: 10px;
  height: 1px;
  background: var(--blue-500);
}

.page-about .about-origin__list li:first-child::before {
  top: 10px;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline__figure {
  margin: 0 0 clamp(24px, 3.6vw, 40px);
}

.page-about .track {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(238px, 82%);
  gap: 0;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
  border-top: 1px solid var(--blue-500);
}

.page-about .track::-webkit-scrollbar {
  height: 4px;
}

.page-about .track::-webkit-scrollbar-thumb {
  background: var(--blue-500);
}

.page-about .track__item {
  position: relative;
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: 12px;
  padding: 20px 18px 26px;
  border-left: 1px solid var(--line-soft);
  scroll-snap-align: start;
  transition: background-color .2s var(--ease);
}

.page-about .track__item:hover,
.page-about .track__item:focus-within {
  background: rgba(255, 255, 255, .62);
}

.page-about .track__item::after {
  content: "";
  position: absolute;
  left: -1px;
  top: 0;
  width: 1px;
  height: 0;
  background: var(--orange);
  transition: height .24s var(--ease);
}

.page-about .track__item:hover::after,
.page-about .track__item:focus-within::after {
  height: 100%;
}

.page-about .track__num {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--orange);
  padding-top: 2px;
}

.page-about .track__year {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--graphite);
}

.page-about .track__title {
  margin: 0 0 8px;
  font-size: 18px;
  line-height: 1.4;
  color: var(--blue-900);
}

.page-about .track__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--graphite);
  transition: color .2s var(--ease);
}

.page-about .track__item:hover .track__desc,
.page-about .track__item:focus-within .track__desc {
  color: var(--ink);
}

/* ---------- 六大区 ---------- */
.page-about .about-regions__grid {
  align-items: start;
  gap: var(--about-gap);
}

.page-about .about-regions__main .title-md {
  margin: 12px 0 18px;
}

.page-about .about-regions__main p {
  margin: 0 0 16px;
  max-width: 36em;
}

.page-about .about-regions__link {
  display: inline-block;
  margin-top: 4px;
  font-size: 14px;
  font-weight: 700;
  color: var(--orange-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--orange);
  padding-bottom: 2px;
  transition: color .16s var(--ease), border-color .16s var(--ease);
}

.page-about .about-regions__link:hover {
  color: var(--blue-900);
  border-color: var(--cyan);
}

.page-about .regions {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--blue-500);
}

.page-about .regions__row {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 6px 16px;
  align-items: baseline;
  padding: 14px 0 14px 0;
  border-bottom: 1px solid var(--line-soft);
  transition: transform .18s var(--ease);
}

.page-about .regions__row::before {
  content: "";
  position: absolute;
  left: -12px;
  top: 12px;
  bottom: 12px;
  width: 3px;
  background: var(--cyan);
  opacity: 0;
  transition: opacity .18s var(--ease);
}

.page-about .regions__row:hover {
  transform: translateX(8px);
}

.page-about .regions__row:hover::before {
  opacity: 1;
}

.page-about .regions__name {
  font-size: 17px;
  font-weight: 700;
  color: var(--blue-900);
}

.page-about .regions__lines {
  font-size: 13px;
  color: var(--orange-deep);
}

.page-about .regions__note {
  grid-column: 1 / -1;
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--graphite);
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.6vw, 40px);
}

.page-about .team-index {
  display: grid;
  gap: 10px;
}

.page-about .team-index__item {
  display: grid;
  grid-template-columns: 26px 1fr;
  grid-template-rows: auto auto;
  column-gap: 14px;
  align-items: center;
  padding: 16px 18px;
  background: var(--blue-900);
  color: var(--mist);
  text-decoration: none;
  transition: transform .18s var(--ease), background-color .18s var(--ease);
}

.page-about .team-index__item:hover {
  transform: translateX(8px);
  background: var(--blue-700);
}

.page-about .team-index__item:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .team-index__num {
  grid-row: 1 / -1;
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-about .team-index__count {
  font-family: var(--font-display);
  font-size: 26px;
  line-height: 1.1;
  letter-spacing: .02em;
}

.page-about .team-index__label {
  font-size: 13px;
  color: rgba(233, 238, 243, .68);
}

.page-about .team-notes {
  display: block;
}

.page-about .team-note {
  padding: 22px 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 96px;
}

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

.page-about .team-note__title {
  position: relative;
  margin: 0 0 10px;
  padding-left: 16px;
  font-size: 19px;
  line-height: 1.5;
  color: var(--blue-900);
}

.page-about .team-note__title::before {
  content: "";
  position: absolute;
  left: 0;
  top: .2em;
  bottom: .2em;
  width: 4px;
  background: var(--orange);
}

.page-about .team-note p {
  margin: 0;
  max-width: 40em;
  color: var(--graphite);
}

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

.page-about .about-team__figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-team__caption {
  padding: 10px 14px;
  font-size: 12px;
  line-height: 1.7;
  color: var(--graphite);
  border-top: 1px solid var(--line-soft);
}

/* ---------- 更新节奏 ---------- */
.page-about .cadence {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .cadence__step {
  background: var(--mist);
  padding: 22px 20px 26px;
}

.page-about .cadence__num {
  display: inline-block;
  padding: 3px 9px;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--paper);
  background: var(--orange);
}

.page-about .cadence__title {
  margin: 14px 0 10px;
  font-size: 18px;
  line-height: 1.45;
  color: var(--blue-900);
}

.page-about .cadence__step p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--graphite);
}

.page-about .about-cadence__note {
  margin: 22px 0 0;
  font-size: 14px;
  color: var(--graphite);
}

.page-about .about-cadence__note a {
  color: var(--orange-deep);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.page-about .about-cadence__note a:hover {
  color: var(--blue-900);
  border-color: var(--cyan);
}

/* ---------- 响应机制 ---------- */
.page-about .about-response__grid {
  align-items: start;
  gap: var(--about-gap);
}

.page-about .about-response__main .title-md {
  margin: 12px 0 18px;
}

.page-about .about-response__main p {
  margin: 0 0 16px;
  max-width: 36em;
}

.page-about .about-response__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-response__panel {
  padding: 24px 22px 26px;
  color: var(--mist);
}

.page-about .about-response__panel-title {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--cyan);
}

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

.page-about .about-response__list li {
  display: grid;
  gap: 4px;
  padding: 14px 0;
  border-top: 1px solid var(--line-invert);
}

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

.page-about .about-response__key {
  font-size: 20px;
  line-height: 1.2;
  color: var(--orange);
}

.page-about .about-response__val {
  font-size: 13.5px;
  line-height: 1.6;
  color: rgba(233, 238, 243, .78);
}

/* ---------- 下一步 ---------- */
.page-about .about-cta {
  color: var(--mist);
}

.page-about .about-cta .eyebrow {
  color: var(--cyan);
}

.page-about .about-cta__head .title-lg {
  margin: 12px 0 0;
  color: var(--mist);
  max-width: 20em;
}

.page-about .about-cta__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin-top: clamp(24px, 3.6vw, 40px);
  background: var(--line-invert);
  border: 1px solid var(--line-invert);
}

.page-about .about-cta__card {
  position: relative;
  display: block;
  padding: 24px 20px 26px;
  background: var(--blue-900);
  color: var(--mist);
  text-decoration: none;
  transition: background-color .2s var(--ease), transform .2s var(--ease);
}

.page-about .about-cta__card:hover {
  background: var(--blue-700);
  transform: translateY(-2px);
}

.page-about .about-cta__card:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-about .about-cta__num {
  display: block;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--orange);
}

.page-about .about-cta__card h3 {
  margin: 12px 0 10px;
  font-size: 20px;
  line-height: 1.4;
  color: var(--mist);
}

.page-about .about-cta__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(233, 238, 243, .74);
}

/* ---------- 响应式增强 ---------- */
@media (min-width: 720px) {
  .page-about .track {
    grid-auto-columns: minmax(248px, 296px);
  }

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

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

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

@media (min-width: 880px) {
  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    gap: 0;
    align-items: start;
  }

  .page-about .about-hero__text {
    padding-right: clamp(36px, 5vw, 64px);
  }

  .page-about .about-hero__figure {
    margin-top: 34px;
    clip-path: polygon(7% 0, 100% 0, 100% 100%, 0 100%);
  }

  .page-about .about-team__grid {
    grid-template-columns: 5fr 7fr;
    grid-template-areas:
      "index notes"
      "index figure";
    column-gap: clamp(32px, 4vw, 56px);
    row-gap: clamp(24px, 3vw, 36px);
    align-items: start;
  }

  .page-about .team-index {
    grid-area: index;
    position: sticky;
    top: 24px;
  }

  .page-about .team-notes {
    grid-area: notes;
  }

  .page-about .about-team__figure {
    grid-area: figure;
  }

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

@media (min-width: 1080px) {
  .page-about .about-hero__title {
    font-size: clamp(44px, 4.6vw, 62px);
  }

  .page-about .track {
    grid-auto-columns: minmax(268px, 320px);
  }
}