.page-about {
  background: var(--c-paper);
  color: var(--c-ink-900);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--c-ink-900);
  color: var(--c-paper);
  padding-block: clamp(22px, 4vw, 40px) clamp(40px, 6vw, 84px);
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.34;
}

.page-about .about-hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(104deg,
      var(--c-ink-900) 6%,
      rgba(7, 20, 38, 0.88) 44%,
      rgba(7, 20, 38, 0.30) 100%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__crumbs {
  color: var(--c-mist);
  font-size: 13px;
}

.page-about .about-hero__crumbs a {
  color: var(--c-mist);
  text-decoration: none;
}

.page-about .about-hero__crumbs a:hover,
.page-about .about-hero__crumbs a:focus-visible {
  color: var(--c-gold);
}

.page-about .about-hero__eyebrow {
  margin-top: clamp(26px, 5vw, 54px);
  color: var(--c-celadon);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-cn);
  font-weight: 900;
  font-size: clamp(32px, 6vw, 72px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--c-paper);
}

.page-about .about-hero__accent {
  position: relative;
  white-space: nowrap;
}

.page-about .about-hero__accent::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.04em;
  height: 0.08em;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--c-gold), var(--c-gold-glow));
}

.page-about .about-hero__lede {
  margin-top: clamp(16px, 2.4vw, 24px);
  max-width: 46em;
  color: var(--c-mist);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.75;
}

.page-about .about-hero__metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px clamp(16px, 4vw, 40px);
  margin-top: clamp(28px, 4.5vw, 46px);
  padding-top: clamp(18px, 3vw, 28px);
  border-top: 1px solid var(--line-dark-strong);
}

.page-about .about-hero__metric .metric__value {
  display: block;
  font-family: var(--font-en);
  font-weight: 600;
  font-size: clamp(32px, 5.4vw, 54px);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--c-paper);
}

.page-about .about-hero__metric:first-child .metric__value {
  color: var(--c-gold);
}

.page-about .about-hero__metric .metric__value small {
  font-size: 0.44em;
  font-weight: 500;
  margin-left: 2px;
  letter-spacing: 0;
}

.page-about .about-hero__metric .metric__label {
  display: block;
  margin-top: 9px;
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--c-mist);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 4vw, 44px);
  padding-block: clamp(34px, 5.5vw, 76px);
}

.page-about .about-index__label {
  color: var(--c-celadon-deep);
}

.page-about .about-index__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  gap: 6px 14px;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 0;
  font-size: 14px;
  color: var(--c-ink-700);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--c-ink-900);
  border-bottom-color: var(--c-gold);
}

.page-about .about-index__num {
  font-size: 12px;
  color: var(--c-celadon-deep);
}

.page-about .about-content {
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  position: relative;
  padding-block: clamp(30px, 4.5vw, 56px);
  border-top: 1px solid var(--c-rule);
  scroll-margin-top: calc(var(--header-h) + 24px);
}

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

.page-about .about-chapter__head {
  position: relative;
  margin-bottom: clamp(16px, 2.4vw, 26px);
  padding-right: 56px;
}

.page-about .about-chapter__ghost {
  position: absolute;
  top: -0.22em;
  right: 0;
  font-size: clamp(52px, 8vw, 100px);
  font-weight: 300;
  line-height: 1;
  letter-spacing: -0.04em;
  color: rgba(7, 20, 38, 0.07);
  pointer-events: none;
  user-select: none;
}

.page-about .about-chapter .eyebrow {
  color: var(--c-celadon-deep);
}

.page-about .about-chapter .section-title {
  margin-top: 10px;
  max-width: 22em;
  color: var(--c-ink-900);
}

.page-about .about-chapter .prose {
  max-width: 36em;
  color: var(--c-ink-700);
}

.page-about .about-chapter__sub {
  margin-top: 14px;
}

.page-about .about-inline-link {
  color: var(--c-celadon-deep);
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--c-gold);
}

/* ---------- 城市标签 ---------- */
.page-about .about-city-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-city-list li {
  font-size: 13px;
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid var(--c-rule);
  background: var(--c-linen);
  color: var(--c-ink-700);
}

/* ---------- 承接方式 ---------- */
.page-about .about-route-grid {
  margin-top: clamp(20px, 3vw, 28px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-route {
  padding: 20px;
  border-radius: var(--radius-m);
  border: 1px solid var(--c-rule);
  background: var(--c-linen);
  color: var(--c-ink-700);
}

.page-about .about-route:first-child {
  background: var(--c-ink-800);
  border-color: var(--c-ink-700);
  color: var(--c-paper);
}

.page-about .about-route__tag {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--c-celadon);
}

.page-about .about-route h3 {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 700;
  color: inherit;
}

.page-about .about-route p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: inherit;
}

.page-about .about-route:first-child p {
  color: var(--c-mist);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  display: flex;
  gap: 14px;
  margin: 18px 0 0;
  padding: 4px 0 16px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
  scrollbar-color: var(--c-rule) transparent;
}

.page-about .about-timeline::-webkit-scrollbar {
  height: 6px;
}

.page-about .about-timeline::-webkit-scrollbar-thumb {
  background: var(--c-rule);
  border-radius: 99px;
}

.page-about .about-timeline__item {
  flex: 0 0 82%;
  max-width: 320px;
  scroll-snap-align: start;
  padding: 20px;
  border-radius: var(--radius-m);
  background: var(--c-ink-800);
  border: 1px solid var(--c-ink-700);
  color: var(--c-paper);
}

.page-about .about-timeline__year {
  display: inline-block;
  font-size: clamp(26px, 4vw, 36px);
  font-weight: 600;
  line-height: 1;
  color: var(--c-gold);
}

.page-about .about-timeline__item h3 {
  margin: 12px 0 8px;
  font-size: 18px;
  font-weight: 700;
  color: var(--c-paper);
}

.page-about .about-timeline__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--c-mist);
}

.page-about .about-timeline__hint {
  margin-top: 14px;
  font-size: 13.5px;
  color: var(--c-ink-700);
  line-height: 1.7;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.6vw, 40px);
  margin-top: clamp(18px, 3vw, 26px);
}

.page-about .about-team__media {
  margin-top: 18px;
  border-radius: var(--radius-l);
}

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

.page-about .about-team__cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .about-role {
  position: relative;
  overflow: hidden;
  padding: 16px 14px 16px 18px;
  border: 1px solid var(--c-rule);
  border-radius: var(--radius-m);
  background: var(--c-paper);
}

.page-about .about-role::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  bottom: 14px;
  width: 3px;
  border-radius: 3px;
  background: var(--c-celadon);
}

.page-about .about-role__num {
  display: block;
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 600;
  line-height: 1;
  color: var(--c-ink-900);
}

.page-about .about-role__name {
  margin: 8px 0 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--c-ink-900);
}

.page-about .about-role p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--c-ink-700);
}

/* ---------- 行业包 ---------- */
.page-about .about-industry-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: clamp(18px, 3vw, 26px);
}

.page-about .about-industry {
  padding: 18px 20px;
  border: 1px solid var(--c-rule);
  border-radius: var(--radius-organic);
  background: var(--c-linen);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-industry:hover {
  transform: translateY(-2px);
  border-color: var(--c-celadon-deep);
}

.page-about .about-industry .tag {
  font-size: 12px;
  letter-spacing: 0.06em;
}

.page-about .about-industry h3 {
  margin: 10px 0 8px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--c-ink-900);
}

.page-about .about-industry p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--c-ink-700);
}

/* ---------- 五步流程 ---------- */
.page-about .about-flow {
  list-style: none;
  margin: clamp(18px, 3vw, 26px) 0 0;
  padding: 0;
}

.page-about .about-flow li {
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr);
  gap: 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--c-rule);
}

.page-about .about-flow li:first-child {
  border-top: 1px solid var(--c-rule);
}

.page-about .about-flow .mono {
  font-size: 13px;
  padding-top: 3px;
  color: var(--c-celadon-deep);
}

.page-about .about-flow h3 {
  margin: 0 0 5px;
  font-size: 16px;
  font-weight: 700;
  color: var(--c-ink-900);
}

.page-about .about-flow p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--c-ink-700);
}

/* ---------- 三段质量 ---------- */
.page-about .about-quality-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: clamp(22px, 3.4vw, 32px);
}

.page-about .about-quality {
  padding: 18px 20px;
  border: 1px solid var(--c-rule);
  border-left: 3px solid var(--c-celadon);
  border-radius: var(--radius-s);
  background: var(--c-paper);
}

.page-about .about-quality h3 {
  margin: 0 0 7px;
  font-size: 16px;
  font-weight: 700;
  color: var(--c-ink-900);
}

.page-about .about-quality p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--c-ink-700);
}

/* ---------- 合作生态 ---------- */
.page-about .about-ecosystem {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3.4vw, 36px);
  margin-top: clamp(26px, 4vw, 40px);
  padding-top: clamp(24px, 4vw, 36px);
  border-top: 1px solid var(--c-rule);
}

.page-about .about-ecosystem__media .media {
  border-radius: var(--radius-l);
}

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

.page-about .about-ecosystem__text h3 {
  margin: 0 0 12px;
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--c-ink-900);
}

.page-about .about-eco-list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-eco-list li {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 10px 0;
  border-top: 1px solid var(--c-rule);
  font-size: 14.5px;
  line-height: 1.68;
  color: var(--c-ink-700);
}

.page-about .about-eco-list .mono {
  font-size: 15px;
  font-weight: 600;
  color: var(--c-celadon-deep);
}

/* ---------- 收束行动 ---------- */
.page-about .about-cta {
  background: var(--c-linen);
  border-top: 1px solid var(--c-rule);
  padding-block: clamp(34px, 5vw, 68px);
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.page-about .about-cta .eyebrow {
  color: var(--c-celadon-deep);
}

.page-about .about-cta .section-title {
  margin: 10px 0 0;
  color: var(--c-ink-900);
}

.page-about .about-cta .prose {
  margin-top: 14px;
  max-width: 34em;
  color: var(--c-ink-700);
}

.page-about .about-cta__actions {
  display: grid;
  gap: 10px;
  align-content: start;
}

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

@media (min-width: 760px) {
  .page-about .about-hero__metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-timeline__item {
    flex: 0 0 300px;
    max-width: none;
  }
}

@media (min-width: 900px) {
  .page-about .about-layout {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
  }

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

  .page-about .about-index__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
    margin-top: 14px;
  }

  .page-about .about-index__link {
    width: 100%;
    padding: 10px 0;
    border-bottom: 1px solid var(--c-rule);
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    align-items: start;
  }

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

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    align-items: end;
    gap: 48px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-route-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

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

  .page-about .about-industry:hover {
    transform: none;
  }

  .page-about .about-timeline {
    scroll-behavior: auto;
  }
}