.page-about {
  --ab-gap: clamp(20px, 4vw, 40px);
  --ab-sec-y: clamp(56px, 8vw, 108px);
  --ab-hair: 1px solid var(--line-600);
  --ab-hair-soft: 1px solid rgba(40, 75, 102, 0.55);
  background: linear-gradient(180deg, var(--ink-950) 0%, var(--ink-900) 34%, var(--ink-900) 100%);
  color: var(--mist-100);
  overflow-x: clip;
}

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

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 0;
}

.page-about h2 {
  font-size: clamp(26px, 4.2vw, 46px);
  line-height: 1.06;
}

.page-about h3 {
  font-size: clamp(18px, 2.2vw, 23px);
  line-height: 1.25;
}

.page-about .eyebrow {
  margin: 0 0 12px;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0 0 clamp(20px, 4vw, 34px);
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--steel-500);
}

.page-about .breadcrumb li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .breadcrumb li + li::before {
  content: "/";
  color: var(--line-600);
}

.page-about .breadcrumb a {
  color: var(--steel-300);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--cyan-400);
  border-bottom-color: var(--cyan-400);
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: clamp(20px, 4vw, 40px) 0 clamp(32px, 5vw, 60px);
  border-bottom: var(--ab-hair);
  isolation: isolate;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -12%;
  width: min(78vw, 720px);
  height: min(78vw, 720px);
  background: radial-gradient(circle at 50% 50%, rgba(54, 224, 255, 0.15), transparent 64%);
  z-index: -1;
  pointer-events: none;
}

.page-about .ab-hero__inner {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .ab-hero h1 {
  font-size: clamp(34px, 7.2vw, 74px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  margin: 0 0 clamp(16px, 2.4vw, 26px);
  text-wrap: balance;
}

.page-about .ab-hero__lede {
  max-width: 58ch;
  margin: 0 0 clamp(20px, 3vw, 32px);
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--steel-300);
}

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

.page-about .ab-hero__media {
  margin: 0;
  position: relative;
}

.page-about .ab-hero__media img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: var(--ab-hair);
  clip-path: polygon(0 0, 100% 0, 100% 86%, 88% 100%, 0 100%);
}

.page-about .ab-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  list-style: none;
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
}

.page-about .ab-jump a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: var(--ab-hair);
  color: var(--steel-300);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .ab-jump a::before {
  content: "↘";
  color: var(--cyan-400);
}

.page-about .ab-jump a:hover,
.page-about .ab-jump a:focus-visible {
  color: var(--mist-100);
  border-color: var(--cyan-400);
  background: rgba(54, 224, 255, 0.08);
}

/* ---------- 概览数据 ---------- */
.page-about .ab-stats {
  background: linear-gradient(100deg, rgba(23, 55, 80, 0.55), rgba(10, 27, 43, 0) 72%);
  border-bottom: var(--ab-hair);
}

.page-about .ab-stats__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: var(--ab-hair);
  border-left: var(--ab-hair);
}

.page-about .ab-stat {
  padding: clamp(16px, 3vw, 26px) clamp(12px, 2vw, 22px);
  border-right: var(--ab-hair);
  border-bottom: var(--ab-hair);
}

.page-about .ab-stat__num {
  display: block;
  font-size: clamp(24px, 4vw, 38px);
  line-height: 1.1;
  color: var(--orange-500);
}

.page-about .ab-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--steel-500);
}

/* ---------- 品牌缘起 ---------- */
.page-about .ab-origin {
  padding: var(--ab-sec-y) 0;
}

.page-about .ab-origin__inner {
  display: grid;
  gap: clamp(24px, 4vw, 52px);
}

.page-about .ab-origin__body p {
  margin: 0 0 18px;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--steel-300);
}

.page-about .ab-origin__body p:first-child {
  font-size: clamp(16px, 1.9vw, 19px);
  color: var(--mist-100);
}

.page-about .ab-origin__points {
  list-style: none;
  margin: clamp(24px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
  border-top: var(--ab-hair);
  padding-top: clamp(18px, 3vw, 26px);
}

.page-about .ab-origin__points li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--steel-300);
}

.page-about .ab-origin__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  background: var(--cyan-600);
}

.page-about .ab-origin__points strong {
  color: var(--mist-100);
  font-weight: 600;
}

/* ---------- 版本演进 ---------- */
.page-about .ab-timeline-sec {
  padding: var(--ab-sec-y) 0;
  border-top: var(--ab-hair);
  background: linear-gradient(180deg, rgba(16, 40, 61, 0.6), rgba(10, 27, 43, 0) 78%);
}

.page-about .ab-timeline {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
}

.page-about .ab-timeline__rail {
  align-self: start;
}

.page-about .ab-timeline__sub {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--steel-500);
  max-width: 34ch;
}

.page-about .ab-version-badge {
  margin: clamp(16px, 3vw, 26px) 0 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(52px, 11vw, 88px);
  line-height: 0.9;
  letter-spacing: -0.05em;
  color: rgba(54, 224, 255, 0.16);
  -webkit-text-stroke: 1px var(--cyan-600);
}

.page-about .ab-spark {
  display: block;
  width: 100%;
  max-width: 220px;
  height: auto;
  margin-top: 18px;
}

.page-about .ab-nodes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(16px, 2.4vw, 22px);
}

.page-about .ab-node {
  position: relative;
  padding: clamp(18px, 3vw, 28px) clamp(16px, 3vw, 30px);
  border: var(--ab-hair);
  background: linear-gradient(120deg, rgba(16, 40, 61, 0.85), rgba(10, 27, 43, 0.35));
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 0;
  width: 2px;
  height: 100%;
  background: linear-gradient(180deg, var(--cyan-400), var(--orange-500));
  opacity: 0.35;
  transition: opacity 0.25s var(--ease);
}

.page-about .ab-node:hover,
.page-about .ab-node:focus,
.page-about .ab-node:focus-within {
  border-color: var(--cyan-600);
  transform: translateY(-2px);
}

.page-about .ab-node:hover::before,
.page-about .ab-node:focus::before,
.page-about .ab-node:focus-within::before {
  opacity: 1;
}

.page-about .ab-node:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 3px;
}

.page-about .ab-node__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.page-about .ab-node__phase {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--steel-500);
}

.page-about .ab-node h3 {
  margin-bottom: 10px;
}

.page-about .ab-node__lead {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--steel-300);
}

.page-about .ab-node__note {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--steel-500);
  border-left: 1px solid var(--line-600);
  padding-left: 14px;
}

.page-about .ab-timeline__figure {
  margin: clamp(28px, 4vw, 44px) 0 0;
}

.page-about .ab-timeline__figure img {
  width: 100%;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border: var(--ab-hair);
}

.page-about .ab-timeline__figure figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--steel-500);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  padding: var(--ab-sec-y) 0;
  border-top: var(--ab-hair);
}

.page-about .ab-team__top {
  display: grid;
  gap: clamp(20px, 4vw, 44px);
}

.page-about .ab-team__lede {
  margin: 16px 0 0;
  max-width: 52ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--steel-300);
}

.page-about .ab-team__media {
  margin: 0;
}

.page-about .ab-team__media img {
  width: 100%;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  border: var(--ab-hair);
  filter: saturate(0.85) contrast(1.05);
}

.page-about .ab-team__grid {
  display: grid;
  gap: clamp(14px, 2vw, 20px);
  margin-top: clamp(28px, 4vw, 48px);
}

.page-about .ab-card {
  position: relative;
  padding: clamp(20px, 3vw, 30px);
  border: var(--ab-hair);
  background: var(--ink-800);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .ab-card::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 42px;
  height: 42px;
  background: linear-gradient(135deg, transparent 50%, rgba(54, 224, 255, 0.22) 50%);
  pointer-events: none;
}

.page-about .ab-card:hover {
  border-color: var(--cyan-600);
  transform: translateY(-3px);
  background: var(--ink-700);
}

.page-about .ab-card:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 3px;
  border-color: var(--cyan-400);
}

.page-about .ab-card__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange-300);
}

.page-about .ab-card h3 {
  margin: 10px 0 6px;
}

.page-about .ab-card__num {
  display: block;
  font-size: clamp(38px, 6vw, 56px);
  line-height: 1;
  color: var(--cyan-400);
  margin-bottom: 14px;
}

.page-about .ab-card__num span {
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--steel-500);
  margin-left: 6px;
}

.page-about .ab-card__desc {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--steel-300);
}

.page-about .ab-card__list {
  list-style: none;
  margin: 0;
  padding: 14px 0 0;
  border-top: var(--ab-hair-soft);
  display: grid;
  gap: 8px;
}

.page-about .ab-card__list li {
  position: relative;
  padding-left: 16px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--steel-500);
}

.page-about .ab-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 6px;
  height: 6px;
  border: 1px solid var(--cyan-600);
}

/* ---------- 内容流程 ---------- */
.page-about .ab-flow {
  padding: var(--ab-sec-y) 0;
  border-top: var(--ab-hair);
  background: linear-gradient(180deg, rgba(6, 17, 29, 0.85), rgba(10, 27, 43, 0) 82%);
}

.page-about .ab-flow__head p:last-child {
  margin: 16px 0 0;
  max-width: 60ch;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--steel-300);
}

.page-about .ab-flow__steps {
  list-style: none;
  margin: clamp(24px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  gap: clamp(18px, 2.4vw, 22px);
}

.page-about .ab-step {
  border-top: 2px solid var(--cyan-600);
  padding-top: 16px;
  transition: border-color 0.25s var(--ease);
}

.page-about .ab-step:hover {
  border-top-color: var(--orange-500);
}

.page-about .ab-step__idx {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--orange-500);
}

.page-about .ab-step h3 {
  font-size: clamp(17px, 2vw, 21px);
  margin-bottom: 8px;
}

.page-about .ab-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--steel-300);
}

.page-about .ab-fast {
  margin-top: clamp(26px, 4vw, 40px);
  padding: clamp(18px, 3vw, 28px);
  border: var(--ab-hair);
  border-left: 3px solid var(--orange-500);
  background: linear-gradient(100deg, rgba(255, 122, 47, 0.08), rgba(16, 40, 61, 0.4) 60%);
}

.page-about .ab-fast h3 {
  font-size: clamp(17px, 2vw, 21px);
  margin-bottom: 8px;
}

.page-about .ab-fast p {
  margin: 0;
  max-width: 66ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--steel-300);
}

/* ---------- 覆盖与协作 ---------- */
.page-about .ab-reach {
  padding: var(--ab-sec-y) 0;
  border-top: var(--ab-hair);
}

.page-about .ab-reach__inner {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
}

.page-about .ab-reach__copy p {
  margin: 16px 0 0;
  max-width: 56ch;
  font-size: clamp(15px, 1.6vw, 16.5px);
  line-height: 1.85;
  color: var(--steel-300);
}

.page-about .ab-reach__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .ab-legend {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-600);
  border: var(--ab-hair);
}

.page-about .ab-legend__item {
  background: var(--ink-900);
  padding: clamp(14px, 2.4vw, 20px);
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: background 0.25s var(--ease);
}

.page-about .ab-legend__item:hover {
  background: var(--ink-800);
}

.page-about .ab-legend__key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--steel-500);
}

.page-about .ab-legend__val {
  font-size: clamp(20px, 3vw, 28px);
  line-height: 1.1;
  color: var(--mist-100);
}

.page-about .ab-legend__item:nth-child(3n + 1) .ab-legend__val {
  color: var(--cyan-400);
}

.page-about .ab-legend__item:nth-child(4n) .ab-legend__val {
  color: var(--orange-500);
}

.page-about .ab-legend__note {
  font-size: 12px;
  line-height: 1.5;
  color: var(--steel-500);
}

/* ---------- 结尾行动 ---------- */
.page-about .ab-cta {
  border-top: var(--ab-hair);
  padding: clamp(44px, 7vw, 84px) 0 clamp(56px, 8vw, 96px);
  background:
    radial-gradient(circle at 88% 0%, rgba(54, 224, 255, 0.14), transparent 58%),
    linear-gradient(180deg, rgba(16, 40, 61, 0.6), rgba(6, 17, 29, 0.9));
}

.page-about .ab-cta__inner {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
}

.page-about .ab-cta__copy p {
  margin: 16px 0 0;
  max-width: 56ch;
  font-size: clamp(15px, 1.6vw, 16.5px);
  line-height: 1.85;
  color: var(--steel-300);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
}

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

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

  .page-about .ab-card:nth-child(2) {
    margin-top: 26px;
  }

  .page-about .ab-card:nth-child(3) {
    margin-top: 52px;
  }

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

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

@media (min-width: 900px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: end;
  }

  .page-about .ab-origin__inner {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
  }

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

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

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

  .page-about .ab-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 960px) {
  .page-about .ab-timeline {
    grid-template-columns: minmax(230px, 292px) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .ab-timeline__rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }

  .page-about .ab-node__note {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0;
    padding-top: 0;
    padding-bottom: 0;
    transition: max-height 0.35s var(--ease), opacity 0.25s var(--ease), margin-top 0.35s var(--ease), padding 0.35s var(--ease);
  }

  .page-about .ab-node:hover .ab-node__note,
  .page-about .ab-node:focus .ab-node__note,
  .page-about .ab-node:focus-within .ab-node__note {
    max-height: 220px;
    opacity: 1;
    margin-top: 12px;
    padding-top: 2px;
    padding-bottom: 2px;
  }
}

@media (min-width: 1000px) {
  .page-about .ab-flow__steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-node,
  .page-about .ab-card,
  .page-about .ab-node__note,
  .page-about .ab-jump a {
    transition: none;
  }

  .page-about .ab-node:hover,
  .page-about .ab-node:focus,
  .page-about .ab-node:focus-within,
  .page-about .ab-card:hover {
    transform: none;
  }
}