.page-about {
  --about-gap: 40px;
  --about-aside-col: 300px;
  --about-index-col: 96px;
  background: var(--ink-900);
  color: var(--text-100);
  padding-bottom: 72px;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  margin: 20px 0 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 32px;
  padding: 28px 0 48px;
  border-top: 1px solid var(--line-500);
  margin-top: 20px;
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 7.2vw, 56px);
  line-height: 1.06;
  letter-spacing: 0.01em;
  color: var(--text-100);
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 34em;
  font-size: var(--fs-17);
  line-height: 1.85;
  color: var(--text-300);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 28px 0 0;
  background: var(--line-500);
  border: 1px solid var(--line-500);
}

.page-about .about-stats__item {
  background: var(--ink-800);
  padding: 14px 16px 16px;
}

.page-about .about-stats dt {
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--text-300);
}

.page-about .about-stats dd {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: var(--fs-22);
  line-height: 1.2;
  color: var(--text-100);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stats dd .num {
  color: var(--cyan);
}

.page-about .about-hero__figure {
  margin: 0;
  border: 1px solid var(--line-500);
  background: var(--ink-800);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .about-hero__figure figcaption {
  padding: 12px 14px;
  border-top: 1px solid var(--line-500);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--text-300);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  display: grid;
  gap: 20px;
  padding-block: 44px;
  border-top: 1px solid var(--line-500);
}

.page-about .about-section__index {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(42px, 10vw, 64px);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.03em;
  color: rgba(0, 229, 208, 0.3);
}

.page-about .about-section__body h2 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(26px, 4.4vw, 34px);
  line-height: 1.18;
  color: var(--text-100);
}

.page-about .about-section__lede {
  margin: 0 0 26px;
  max-width: 34em;
  font-size: var(--fs-17);
  line-height: 1.85;
  color: var(--text-300);
}

.page-about .about-section__body h3 {
  margin: 0 0 6px;
  font-size: var(--fs-17);
  font-weight: 600;
  line-height: 1.5;
  color: var(--text-100);
}

.page-about .about-section__body p {
  margin: 0;
  font-size: var(--fs-17);
  line-height: 1.8;
  color: var(--text-300);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 24px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--line-500) 62%, rgba(43, 59, 82, 0) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 26px 2px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(0, 229, 208, 0.14);
}

.page-about .about-timeline__item--open::before {
  background: transparent;
  border: 1px solid var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 122, 47, 0.14);
}

.page-about .about-timeline__year {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: var(--fs-14);
  letter-spacing: 0.14em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-timeline__item--open .about-timeline__year {
  color: var(--orange);
}

/* ---------- 氛围纹理 ---------- */
.page-about .about-texture {
  margin: 0;
  border: 1px solid var(--line-500);
  background: var(--ink-800);
}

.page-about .about-texture img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 7;
  object-fit: cover;
  opacity: 0.92;
}

/* ---------- 三组团队 ---------- */
.page-about .about-teams {
  display: grid;
  gap: 1px;
  margin-top: 4px;
  background: var(--line-500);
  border: 1px solid var(--line-500);
}

.page-about .about-team {
  background: var(--ink-800);
  padding: 22px 20px 24px;
}

.page-about .about-team__n {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-team__name {
  margin: 8px 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-22);
  line-height: 1.2;
  color: var(--text-100);
}

.page-about .about-team__desc {
  margin: 0 0 18px;
  font-size: var(--fs-17);
  line-height: 1.75;
  color: var(--text-300);
}

.page-about .about-team__hand {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--line-500);
}

.page-about .about-team__hand dt {
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: var(--text-300);
}

.page-about .about-team__hand dd {
  margin: 4px 0 10px;
  font-size: var(--fs-14);
  color: var(--text-100);
}

.page-about .about-team__hand dd:last-child {
  margin-bottom: 0;
}

/* ---------- 校对流程 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-steps__item {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  column-gap: 18px;
  padding: 18px 0;
  border-top: 1px solid var(--line-500);
}

.page-about .about-steps__item:last-child {
  border-bottom: 1px solid var(--line-500);
}

.page-about .about-steps__n {
  font-family: var(--font-mono);
  font-size: var(--fs-17);
  font-weight: 700;
  line-height: 1.6;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-flowfig {
  margin: 26px 0 0;
  border: 1px solid var(--line-500);
  background: var(--ink-800);
}

.page-about .about-flowfig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 3;
  object-fit: cover;
}

.page-about .about-flowfig figcaption {
  padding: 12px 14px;
  border-top: 1px solid var(--line-500);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--text-300);
}

/* ---------- 四条做法 ---------- */
.page-about .about-values {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-values li {
  border-left: 2px solid var(--cyan);
  padding: 2px 0 2px 18px;
  margin-bottom: 24px;
}

.page-about .about-values li:last-child {
  margin-bottom: 0;
}

.page-about .about-values li p {
  margin: 0;
  font-size: var(--fs-17);
  line-height: 1.8;
  color: var(--text-300);
}

/* ---------- 来源协作 ---------- */
.page-about .about-order {
  border-top: 1px solid var(--line-500);
}

.page-about .about-order__row {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  column-gap: 18px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-500);
}

.page-about .about-order__n {
  font-family: var(--font-mono);
  font-size: var(--fs-17);
  font-weight: 700;
  line-height: 1.6;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

/* ---------- 更新节奏 ---------- */
.page-about .about-rhythm {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line-500);
  border: 1px solid var(--line-500);
}

.page-about .about-rhythm li {
  background: var(--ink-800);
  padding: 18px 20px 20px;
}

.page-about .about-rhythm__k {
  display: inline-block;
  margin-bottom: 8px;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: var(--ink-900);
  background: var(--cyan);
}

.page-about .about-rhythm li:nth-child(2) .about-rhythm__k {
  background: var(--orange);
}

.page-about .about-rhythm li p {
  margin: 0;
  font-size: var(--fs-17);
  line-height: 1.8;
  color: var(--text-300);
}

/* ---------- 尾段入口 ---------- */
.page-about .about-cta {
  margin-top: 8px;
  padding: 36px 24px 40px;
  border-top: 1px solid var(--line-500);
  border-bottom: 1px solid var(--line-500);
  background:
    linear-gradient(115deg, rgba(0, 229, 208, 0.08) 0%, rgba(7, 14, 26, 0) 46%),
    var(--ink-800);
}

.page-about .about-cta h2 {
  margin: 10px 0 22px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 4vw, 34px);
  line-height: 1.2;
  color: var(--text-100);
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 平板 ---------- */
@media (min-width: 700px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .about-cta {
    padding: 44px 40px 48px;
  }
}

/* ---------- 桌面：画册式非对称三栏 ---------- */
@media (min-width: 960px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: end;
    column-gap: 56px;
    padding: 36px 0 64px;
  }

  .page-about .about-hero__figure {
    margin-bottom: -18px;
  }

  .page-about .about-section {
    grid-template-columns: var(--about-index-col) minmax(0, 1fr) var(--about-aside-col);
    column-gap: var(--about-gap);
    align-items: start;
    padding-block: 64px;
  }

  .page-about .about-section__index {
    font-size: 88px;
  }

  .page-about .about-section__mark {
    position: sticky;
    top: 84px;
  }

  .page-about .about-section__body {
    grid-column: 2 / 3;
  }

  .page-about .about-section__aside {
    grid-column: 3 / 4;
  }

  .page-about .about-section--solo .about-section__body {
    grid-column: 2 / 4;
  }

  .page-about .about-section--solo .about-section__lede {
    max-width: 32em;
  }

  .page-about .about-teams {
    margin-top: 8px;
  }

  .page-about .about-values {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 40px;
  }

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

  .page-about .about-texture {
    margin-top: 4px;
  }
}

/* ---------- 大屏微调 ---------- */
@media (min-width: 1200px) {
  .page-about .about-hero {
    column-gap: 72px;
  }

  .page-about .about-section__body h2 {
    font-size: 38px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
    animation: none !important;
  }
}