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

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding: 18px 0 2px;
  font-size: 13px;
}

/* ---------- 通用排版 ---------- */
.page-about .about-h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(25px, 4.6vw, 40px);
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 10px 0 0;
  color: inherit;
}

.page-about .about-p {
  margin: 16px 0 0;
  font-size: 16.5px;
  line-height: 1.85;
  max-width: 64ch;
  color: var(--ink);
}

.page-about .about-p--note {
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid var(--hair-ink);
  font-size: 15px;
  color: var(--grey);
}

.page-about .about-head {
  max-width: 72ch;
}

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

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(155deg, var(--pitch) 0%, rgba(14, 59, 46, 0) 66%);
  clip-path: polygon(66% 0, 100% 0, 100% 100%, 82% 100%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 30px;
  padding: 40px 0 52px;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(31px, 7.2vw, 62px);
  line-height: 1.05;
  letter-spacing: -0.014em;
  margin: 12px 0 0;
  color: var(--sand);
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 54ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(237, 228, 211, 0.86);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--hair);
  border-top: 1px solid var(--hair);
  border-bottom: 1px solid var(--hair);
}

.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 12px 2px;
  background: var(--night);
}

.page-about .about-hero__facts .data-num {
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-hero__facts em {
  font-style: normal;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: rgba(237, 228, 211, 0.74);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-hero__figure {
  margin: 0;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  border: 1px solid var(--hair-strong);
  border-radius: var(--radius);
  clip-path: polygon(0 0, 100% 0, 100% 86%, 0 100%);
}

/* ---------- 区块节奏 ---------- */
.page-about .about-block {
  padding: 52px 0;
  border-top: 1px solid var(--hair-ink);
}

.page-about .about-block--sand {
  background: var(--sand);
}

/* ---------- 起点：7/5 错位 ---------- */
.page-about .about-split {
  display: grid;
  gap: 28px;
}

.page-about .about-split__aside {
  padding-left: 18px;
}

.page-about .about-notes {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-notes li {
  position: relative;
  padding-left: 16px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink);
}

.page-about .about-notes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.78em;
  width: 7px;
  height: 1px;
  background: var(--orange);
}

/* ---------- 分类体系 ---------- */
.page-about .about-catalog {
  display: grid;
  gap: 30px;
  margin-top: 32px;
}

.page-about .about-catalog__figure {
  margin: 0;
}

.page-about .about-catalog__figure .media-frame {
  aspect-ratio: 3 / 4;
  overflow: hidden;
  border: 1px solid var(--hair-ink);
  border-radius: var(--radius);
  background: var(--slate);
}

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

.page-about .about-caption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--grey);
}

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

.page-about .about-layers li {
  display: grid;
  grid-template-columns: 52px minmax(0, 1fr);
  column-gap: 16px;
  row-gap: 3px;
  padding: 20px 0;
  border-top: 1px solid var(--hair-ink);
}

.page-about .about-layers li:last-child {
  border-bottom: 1px solid var(--hair-ink);
}

.page-about .about-layers__num {
  grid-column: 1;
  grid-row: 1 / span 2;
  padding-top: 3px;
  font-size: 19px;
  font-weight: 700;
  color: var(--pitch);
}

.page-about .about-layers h3 {
  grid-column: 2;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.3;
  letter-spacing: 0.01em;
}

.page-about .about-layers p {
  grid-column: 2;
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--ink);
}

/* ---------- 数据校准：深绿带 ---------- */
.page-about .about-calib {
  background: var(--pitch);
  color: var(--sand);
  padding: 56px 0;
}

.page-about .about-calib .about-h2 {
  color: var(--sand);
}

.page-about .about-calib .about-p {
  color: rgba(237, 228, 211, 0.86);
}

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

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

.page-about .about-calib__steps li {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  column-gap: 14px;
  row-gap: 3px;
  padding: 18px 2px;
  background: var(--pitch);
}

.page-about .about-calib__steps .data-num {
  grid-column: 1;
  grid-row: 1 / span 2;
  padding-top: 3px;
  font-size: 17px;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .about-calib__steps h3 {
  grid-column: 2;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.3;
  color: var(--sand);
}

.page-about .about-calib__steps p {
  grid-column: 2;
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(237, 228, 211, 0.82);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 32px;
  margin-top: 32px;
}

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

.page-about .about-team__list li {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  column-gap: 16px;
  row-gap: 3px;
  padding: 20px 0;
  border-top: 1px solid var(--hair-ink);
}

.page-about .about-team__list li:last-child {
  border-bottom: 1px solid var(--hair-ink);
}

.page-about .about-team__list .data-num {
  grid-column: 1;
  grid-row: 1 / span 2;
  padding-top: 2px;
  font-size: 22px;
  font-weight: 700;
  color: var(--orange);
}

.page-about .about-team__list h3 {
  grid-column: 2;
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.3;
}

.page-about .about-team__list p {
  grid-column: 2;
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--ink);
}

.page-about .about-team__figure {
  margin: 0;
}

.page-about .about-team__figure .media-frame {
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border: 1px solid var(--hair-ink);
  border-radius: var(--radius);
  background: var(--slate);
}

/* ---------- 版本时间线 ---------- */
.page-about .about-timeline {
  margin-top: 28px;
}

.page-about .about-timeline__bar {
  margin-bottom: 26px;
}

.page-about .about-timeline__count {
  align-self: center;
  font-size: 13px;
  color: var(--grey);
}

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

.page-about .about-timeline__item {
  position: relative;
  padding: 20px 0 20px 22px;
  border-left: 2px solid rgba(16, 18, 20, 0.14);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 26px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--sand);
  border: 2px solid var(--pitch);
}

.page-about .about-timeline__ver {
  display: block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--pitch);
}

.page-about .about-timeline__item h3 {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.3;
}

.page-about .about-timeline__item p {
  margin: 6px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-timeline__empty {
  margin: 18px 0 0;
  font-size: 15px;
  color: var(--grey);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  display: grid;
  gap: 30px;
  padding: 32px 22px;
  background: var(--night);
  color: var(--sand);
  border-radius: var(--radius);
}

.page-about .about-cta::after {
  content: "";
  position: absolute;
  right: -50px;
  bottom: -70px;
  width: 220px;
  height: 220px;
  background: var(--pitch);
  clip-path: polygon(0 100%, 100% 100%, 100% 0);
  opacity: 0.6;
  pointer-events: none;
}

.page-about .about-cta__title {
  position: relative;
  z-index: 1;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(23px, 4.4vw, 34px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  margin: 10px 0 0;
  color: var(--sand);
}

.page-about .about-cta__text p {
  position: relative;
  z-index: 1;
  margin: 14px 0 0;
  max-width: 52ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(237, 228, 211, 0.86);
}

.page-about .about-cta__actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-cta__list {
  position: relative;
  z-index: 1;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-cta__list li {
  padding: 16px 0;
  border-top: 1px solid var(--hair);
}

.page-about .about-cta__list li:last-child {
  border-bottom: 1px solid var(--hair);
}

.page-about .about-cta__list strong {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .about-cta__list span {
  display: block;
  margin-top: 6px;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(237, 228, 211, 0.82);
}

.page-about .about-cta__foot {
  margin: 22px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--grey);
}

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

/* ---------- 平板及以上 ---------- */
@media (min-width: 720px) {
  .page-about .about-block {
    padding: 68px 0;
  }

  .page-about .about-calib {
    padding: 72px 0;
  }

  .page-about .about-hero__inner {
    padding: 56px 0 68px;
  }

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

  .page-about .about-hero__facts li {
    padding: 14px 4px;
  }

  .page-about .about-cta {
    padding: 40px 34px;
  }
}

@media (min-width: 960px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-catalog {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-calib__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 48px;
    align-items: center;
  }

  .page-about .about-timeline__list {
    grid-template-columns: repeat(auto-fit, minmax(188px, 1fr));
    border-top: 2px solid rgba(16, 18, 20, 0.14);
  }

  .page-about .about-timeline__item {
    padding: 28px 18px 6px 0;
    border-left: 0;
    border-right: 1px solid rgba(16, 18, 20, 0.12);
  }

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

  .page-about .about-timeline__item::before {
    left: 0;
    top: -7px;
  }
}