.page-about {
  --ab-maxw: 1120px;
  --ab-pad: clamp(16px, 4vw, 48px);
  background: var(--ink);
  color: var(--mist);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

.page-about * {
  box-sizing: border-box;
}

.page-about .ab-wrap {
  width: 100%;
  max-width: var(--ab-maxw);
  margin: 0 auto;
  padding-left: var(--ab-pad);
  padding-right: var(--ab-pad);
}

/* 面包屑 */
.page-about .ab-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: clamp(20px, 4vw, 36px);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--line);
}

.page-about .ab-crumbs a {
  color: var(--line);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .ab-crumbs a:hover,
.page-about .ab-crumbs a:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

/* 通用文字件 */
.page-about .ab-kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .ab-kicker--dark {
  color: var(--orange-text);
}

.page-about .ab-h2 {
  margin: 14px 0 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(25px, 4vw, 40px);
  line-height: 1.22;
  letter-spacing: 0.01em;
}

.page-about .ab-h2--dark {
  color: var(--ink);
}

.page-about .ab-lede {
  margin: 16px 0 0;
  max-width: 52ch;
  font-size: clamp(15px, 2vw, 18px);
  color: var(--line);
}

/* 首屏 */
.page-about .ab-hero {
  position: relative;
  padding: clamp(32px, 5vw, 64px) 0 clamp(44px, 6vw, 88px);
  background:
    repeating-linear-gradient(90deg, rgba(199, 211, 227, 0.06) 0 1px, transparent 1px 96px);
}

.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
}

.page-about .ab-hero h1 {
  margin: 18px 0 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(33px, 6vw, 66px);
  line-height: 1.1;
  letter-spacing: 0.01em;
  max-width: 18ch;
}

.page-about .ab-hero h1::after {
  content: "";
  display: block;
  width: 64px;
  height: 4px;
  margin-top: 22px;
  background: var(--orange);
}

.page-about .ab-hero__lede {
  margin: 22px 0 0;
  max-width: 44ch;
  font-size: clamp(16px, 2.2vw, 19px);
  color: var(--line);
}

.page-about .ab-index {
  align-self: end;
  border-top: 1px solid var(--hair-strong);
  padding-top: 14px;
}

.page-about .ab-index__title {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--line);
}

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

.page-about .ab-index__list li a {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px solid var(--hair);
  color: var(--mist);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.page-about .ab-index__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
  min-width: 22px;
}

.page-about .ab-index__list li a:hover,
.page-about .ab-index__list li a:focus-visible {
  color: var(--orange);
  padding-left: 4px;
}

/* 章节骨架 */
.page-about .ab-section {
  padding: clamp(44px, 6vw, 92px) 0;
  border-top: 1px solid var(--hair);
}

.page-about .ab-section__head {
  margin-bottom: clamp(24px, 4vw, 44px);
}

/* 团队 */
.page-about .ab-team {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .ab-team__text {
  margin: 0 0 16px;
  font-size: clamp(15px, 1.9vw, 17px);
  color: var(--mist);
}

.page-about .ab-team__text:last-of-type {
  color: var(--line);
}

.page-about .ab-chart {
  margin-top: clamp(24px, 3vw, 36px);
  border-top: 1px solid var(--hair-strong);
  padding-top: 16px;
}

.page-about .ab-chart__total {
  margin: 0 0 14px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--line);
}

.page-about .ab-chart__total-num {
  font-family: var(--font-mono);
  font-size: 30px;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
  margin-right: 4px;
}

.page-about .ab-chart__row {
  display: grid;
  grid-template-columns: 6.5em 1fr 2em;
  align-items: center;
  gap: 12px;
  padding: 12px 6px;
  border-bottom: 1px solid var(--hair);
  transition: background-color 0.2s ease;
}

.page-about .ab-chart__row:hover,
.page-about .ab-chart__row:focus-within {
  background: rgba(61, 224, 255, 0.07);
}

.page-about .ab-chart__role {
  font-size: 13px;
  color: var(--line);
}

.page-about .ab-chart__bar {
  display: block;
  height: 8px;
  background: rgba(199, 211, 227, 0.16);
}

.page-about .ab-chart__bar i {
  display: block;
  width: var(--pct);
  height: 100%;
  background: linear-gradient(90deg, var(--orange), var(--orange-soft));
}

.page-about .ab-chart__num {
  font-family: var(--font-mono);
  font-size: 16px;
  text-align: right;
  color: var(--mist);
  font-variant-numeric: tabular-nums;
}

/* 图片 */
.page-about .ab-figure {
  margin: 0;
}

.page-about .ab-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--hair-strong);
  background: var(--ink-2);
}

.page-about .ab-figure figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--line);
  border-left: 2px solid var(--orange);
  padding-left: 10px;
}

.page-about .ab-figure--wide {
  margin-bottom: clamp(24px, 4vw, 40px);
}

/* 流程 */
.page-about .ab-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--hair);
}

.page-about .ab-flow__item {
  background: var(--ink);
  padding: 20px 18px;
  border-left: 2px solid transparent;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .ab-flow__item:hover {
  border-left-color: var(--cyan);
  background: var(--ink-3);
}

.page-about .ab-flow__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .ab-flow__title {
  margin: 6px 0 8px;
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 700;
}

.page-about .ab-flow__text {
  margin: 0;
  font-size: 14.5px;
  color: var(--line);
}

.page-about .ab-note {
  margin: clamp(24px, 3vw, 36px) 0 0;
  padding: 18px 20px;
  border-left: 3px solid var(--cyan);
  background: var(--ink-2);
  font-size: 15px;
  color: var(--mist);
}

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

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: var(--hair-strong);
}

.page-about .ab-timeline__item {
  position: relative;
  padding-left: 40px;
  margin-bottom: 10px;
}

.page-about .ab-timeline__item::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 22px;
  width: 11px;
  height: 11px;
  background: var(--orange);
}

.page-about .ab-timeline details > summary {
  list-style: none;
  cursor: pointer;
}

.page-about .ab-timeline details > summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-stage {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid var(--hair);
  border-left: 2px solid transparent;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .ab-stage:hover {
  border-left-color: var(--cyan);
  background: var(--ink-2);
}

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

.page-about .ab-timeline details[open] > .ab-stage {
  border-left-color: var(--orange);
  background: var(--ink-2);
}

.page-about .ab-stage__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
}

.page-about .ab-stage__name {
  font-family: var(--font-serif);
  font-size: clamp(17px, 2.4vw, 22px);
  font-weight: 700;
  color: var(--mist);
}

.page-about .ab-stage__hint {
  margin-left: auto;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--line);
}

.page-about .ab-stage__hint::after {
  content: "详情";
}

.page-about .ab-timeline details[open] .ab-stage__hint::after {
  content: "收起";
}

.page-about .ab-stage__body {
  padding: 4px 16px 18px;
  border: 1px solid var(--hair);
  border-top: 0;
}

.page-about .ab-stage__body p {
  margin: 12px 0 0;
  font-size: 15px;
  color: var(--line);
  max-width: 62ch;
}

/* 家庭观赛（浅底） */
.page-about .ab-family {
  background: var(--mist);
  color: var(--ink);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .ab-family__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

.page-about .ab-family__text {
  margin: 18px 0 0;
  font-size: clamp(17px, 2.3vw, 20px);
  line-height: 1.8;
  max-width: 40em;
  color: var(--ink);
}

.page-about .ab-family .ab-figure img {
  border-color: var(--line);
  background: var(--ink-2);
}

.page-about .ab-family .ab-figure figcaption {
  color: var(--ink-2);
}

.page-about .ab-preview {
  display: grid;
  gap: 14px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .ab-preview__col {
  background: #fff;
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
  padding: 14px 16px;
}

.page-about .ab-preview__tag {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--orange-text);
}

.page-about .ab-preview__a {
  margin: 0;
  font-size: 15px;
  color: var(--ink);
}

.page-about .ab-preview__b {
  margin: 0;
  font-size: 20px;
  line-height: 1.75;
  color: var(--ink);
}

/* 协作与认可 */
.page-about .ab-partners {
  display: grid;
  gap: 18px;
}

.page-about .ab-partners__card {
  padding: 24px 22px;
  background: var(--ink-2);
  border-top: 2px solid var(--orange);
}

.page-about .ab-partners__card--accent {
  border-top-color: var(--cyan);
}

.page-about .ab-partners__title {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--mist);
}

.page-about .ab-partners__card p {
  margin: 0;
  font-size: 15px;
  color: var(--line);
}

/* 服务方式 */
.page-about .ab-service {
  display: grid;
  gap: 1px;
  background: var(--hair);
}

.page-about .ab-service__item {
  background: var(--ink);
  padding: 22px 18px;
  border-left: 2px solid transparent;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .ab-service__item:hover {
  border-left-color: var(--orange);
  background: var(--ink-3);
}

.page-about .ab-service__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--cyan);
}

.page-about .ab-service__title {
  margin: 8px 0 10px;
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 700;
}

.page-about .ab-service__text {
  margin: 0;
  font-size: 14.5px;
  color: var(--line);
}

.page-about .ab-service__more {
  margin: clamp(22px, 3vw, 32px) 0 0;
}

.page-about .ab-link {
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid var(--orange);
  padding-bottom: 2px;
  font-size: 15px;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .ab-link:hover,
.page-about .ab-link:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* 收尾 */
.page-about .ab-next {
  border-top: 1px solid var(--hair);
  padding: clamp(40px, 6vw, 80px) 0 clamp(48px, 7vw, 96px);
  background:
    linear-gradient(180deg, rgba(255, 107, 26, 0.08), transparent 70%);
}

.page-about .ab-next__inner {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
  align-items: end;
}

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

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

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

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

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

/* 桌面 */
@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.85fr);
    align-items: end;
  }

  .page-about .ab-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.82fr);
    align-items: start;
  }

  .page-about .ab-figure--team {
    margin-top: 8px;
  }

  .page-about .ab-family__grid {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1fr);
    align-items: center;
  }

  .page-about .ab-next__inner {
    grid-template-columns: minmax(0, 1fr) auto;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-crumbs a,
  .page-about .ab-index__list li a,
  .page-about .ab-chart__row,
  .page-about .ab-flow__item,
  .page-about .ab-stage,
  .page-about .ab-service__item,
  .page-about .ab-link {
    transition: none;
  }
}
<<<END>>>

.page-about {
  --pct: 1rem;
}