.page-about {
  --ab-stroke: rgba(0, 229, 208, 0.82);
  --ab-hairline: rgba(42, 58, 92, 0.85);
  background: var(--s3-ink);
  color: var(--s3-text);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: 30px 0 30px;
  background-image:
    radial-gradient(120% 92% at 8% -12%, rgba(0, 229, 208, 0.20), rgba(0, 229, 208, 0) 62%),
    radial-gradient(92% 84% at 102% 0%, rgba(255, 122, 26, 0.20), rgba(255, 122, 26, 0) 58%);
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--s3-cyan), rgba(0, 229, 208, 0) 52%, var(--s3-orange));
  opacity: 0.5;
  pointer-events: none;
}

.page-about .ab-hero__title {
  margin: 10px 0 14px;
  font-size: clamp(32px, 8.4vw, 72px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--s3-text);
  overflow-wrap: break-word;
}

.page-about .ab-hero__lede {
  max-width: 34em;
  margin: 0 0 24px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--s3-muted);
}

.page-about .ab-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px;
  background: var(--s3-line);
  border: 1px solid var(--s3-line);
  border-radius: var(--s3-radius);
  overflow: hidden;
}

.page-about .ab-stats li {
  background: var(--s3-deep);
  padding: 14px 16px;
}

.page-about .ab-stats .s3-num {
  display: block;
  font-family: var(--s3-font-mono);
  font-size: clamp(24px, 7vw, 34px);
  font-weight: 600;
  line-height: 1;
  color: var(--s3-cyan);
}

.page-about .ab-stats span:last-child {
  display: block;
  margin-top: 7px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--s3-muted);
}

/* ---------- 章节跳转 ---------- */
.page-about .ab-jump {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 14px 0 16px;
  border-bottom: 1px solid var(--s3-line);
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .ab-jump::-webkit-scrollbar {
  display: none;
}

.page-about .ab-jump a {
  flex: 0 0 auto;
  padding: 7px 13px;
  border: 1px solid var(--s3-line);
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--s3-muted);
  text-decoration: none;
  transition: color 0.18s var(--s3-ease), border-color 0.18s var(--s3-ease), background-color 0.18s var(--s3-ease);
}

.page-about .ab-jump a:hover,
.page-about .ab-jump a:focus-visible {
  color: var(--s3-ink);
  background: var(--s3-cyan);
  border-color: var(--s3-cyan);
}

/* ---------- 章节骨架 ---------- */
.page-about .ab-section {
  padding: 38px 0 42px;
  border-bottom: 1px solid var(--s3-line);
}

.page-about .ab-section:last-of-type {
  border-bottom: 0;
}

.page-about .ab-head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 16px;
  align-items: start;
  margin-bottom: 24px;
}

.page-about .ab-head__num {
  font-family: var(--s3-font-mono);
  font-size: clamp(44px, 15vw, 92px);
  font-weight: 700;
  line-height: 0.82;
  letter-spacing: -0.05em;
  color: rgba(0, 229, 208, 0.22);
  -webkit-text-stroke: 1.4px var(--ab-stroke);
}

.page-about .ab-head__body {
  min-width: 0;
  padding-top: 6px;
}

.page-about .ab-head__body .s3-h2 {
  margin: 6px 0 0;
  font-size: clamp(22px, 5.4vw, 34px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  overflow-wrap: break-word;
}

.page-about .ab-lede {
  max-width: 34em;
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--s3-muted);
}

.page-about .ab-note {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--s3-muted);
}

/* ---------- 图片 ---------- */
.page-about .ab-visual {
  position: relative;
  margin: 0 0 24px;
  overflow: hidden;
  border-radius: var(--s3-radius);
  border: 1px solid var(--s3-line);
  background: var(--s3-deep);
}

.page-about .ab-visual img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .ab-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(80% 120% at 88% 0%, rgba(255, 122, 26, 0.16), rgba(255, 122, 26, 0) 60%),
    repeating-linear-gradient(0deg, rgba(0, 229, 208, 0.05) 0 1px, rgba(0, 229, 208, 0) 1px 5px);
  pointer-events: none;
}

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

.page-about .ab-node {
  display: grid;
  grid-template-columns: 58px 1fr;
  gap: 0 14px;
  padding: 20px 0;
  border-bottom: 1px solid var(--s3-line);
  transition: background-color 0.2s var(--s3-ease);
}

.page-about .ab-node:first-child {
  border-top: 1px solid var(--s3-line);
}

.page-about .ab-node:hover {
  background-image: linear-gradient(90deg, rgba(0, 229, 208, 0.08), rgba(0, 229, 208, 0) 72%);
}

.page-about .ab-node__mark {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .ab-node__idx {
  font-family: var(--s3-font-mono);
  font-weight: 700;
  font-size: clamp(26px, 8vw, 40px);
  line-height: 1;
  letter-spacing: -0.04em;
  color: rgba(0, 229, 208, 0.24);
  -webkit-text-stroke: 1.1px var(--ab-stroke);
  transition: color 0.18s var(--s3-ease);
}

.page-about .ab-node:hover .ab-node__idx {
  color: var(--s3-cyan);
}

.page-about .ab-node__span {
  font-size: 11px;
  letter-spacing: 0.12em;
  line-height: 1.45;
  color: var(--s3-muted);
}

.page-about .ab-node__body {
  min-width: 0;
}

.page-about .ab-node__body h3 {
  margin: 0 0 8px;
  font-size: clamp(17px, 4.4vw, 23px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--s3-text);
  overflow-wrap: break-word;
}

.page-about .ab-node__body p {
  max-width: 34em;
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--s3-muted);
}

.page-about .ab-node__facts {
  list-style: none;
  margin: 0;
  padding: 12px 0 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  border-top: 1px dashed var(--ab-hairline);
}

.page-about .ab-node__facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--s3-muted);
}

.page-about .ab-node__facts .s3-num {
  font-family: var(--s3-font-mono);
  font-size: 19px;
  font-weight: 600;
  color: var(--s3-orange);
}

/* ---------- 工序 ---------- */
.page-about .ab-craft {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--s3-line);
  border-top: 1px solid var(--s3-line);
  border-bottom: 1px solid var(--s3-line);
}

.page-about .ab-craft > li {
  position: relative;
  padding: 20px 18px 22px;
  background: var(--s3-deep);
  transition: background-color 0.2s var(--s3-ease);
}

.page-about .ab-craft > li:hover {
  background: var(--s3-panel);
}

.page-about .ab-craft > li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--s3-cyan);
}

.page-about .ab-craft > li:nth-child(2)::before {
  background: var(--s3-cyan-bright);
}

.page-about .ab-craft > li:nth-child(3)::before {
  background: var(--s3-orange);
}

.page-about .ab-craft > li:nth-child(4)::before {
  background: var(--s3-amber);
}

.page-about .ab-craft__no {
  display: block;
  font-family: var(--s3-font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--s3-muted);
}

.page-about .ab-craft h3 {
  margin: 10px 0 8px;
  font-size: 18px;
  line-height: 1.3;
  color: var(--s3-text);
}

.page-about .ab-craft p {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.68;
  color: var(--s3-muted);
}

.page-about .ab-craft dl {
  margin: 0;
  display: grid;
  gap: 8px;
}

.page-about .ab-craft dl > div {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 10px;
  padding-top: 8px;
  border-top: 1px solid var(--ab-hairline);
  font-size: 12px;
}

.page-about .ab-craft dt {
  color: var(--s3-muted);
  letter-spacing: 0.08em;
}

.page-about .ab-craft dd {
  margin: 0;
  text-align: right;
  color: var(--s3-text);
  font-family: var(--s3-font-mono);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  gap: 24px;
}

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

.page-about .ab-team__body {
  min-width: 0;
}

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

.page-about .ab-team__list li {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 4px 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--s3-line);
}

.page-about .ab-team__no {
  grid-row: span 2;
  font-family: var(--s3-font-mono);
  font-size: 30px;
  font-weight: 600;
  line-height: 1;
  color: var(--s3-cyan);
}

.page-about .ab-team__list h3 {
  margin: 0;
  font-size: 16px;
  line-height: 1.35;
  color: var(--s3-text);
}

.page-about .ab-team__list p {
  margin: 4px 0 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--s3-muted);
}

/* ---------- 合作生态 ---------- */
.page-about .ab-eco {
  display: grid;
  gap: 26px;
}

.page-about .ab-eco__col h3 {
  margin: 0 0 14px;
  font-size: 17px;
  line-height: 1.35;
  color: var(--s3-text);
}

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

.page-about .ab-eco__types li {
  padding: 14px 0;
  border-bottom: 1px solid var(--s3-line);
}

.page-about .ab-eco__types li:first-child {
  border-top: 1px solid var(--s3-line);
}

.page-about .ab-eco__tag {
  display: inline-block;
  margin-bottom: 8px;
  padding: 3px 8px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--s3-cyan);
  border: 1px solid rgba(0, 229, 208, 0.4);
  border-radius: var(--s3-radius);
}

.page-about .ab-eco__types p {
  margin: 0;
  font-size: 14px;
  line-height: 1.68;
  color: var(--s3-muted);
}

.page-about .ab-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: ab-flow;
}

.page-about .ab-flow li {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 12px;
  align-items: baseline;
  padding: 12px 0;
  border-bottom: 1px solid var(--s3-line);
}

.page-about .ab-flow li:first-child {
  border-top: 1px solid var(--s3-line);
}

.page-about .ab-flow .s3-num {
  font-family: var(--s3-font-mono);
  font-size: 18px;
  font-weight: 600;
  color: var(--s3-orange);
}

.page-about .ab-flow p {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--s3-muted);
}

/* ---------- 质量把控 ---------- */
.page-about .ab-quality {
  display: grid;
  gap: 16px;
}

.page-about .ab-quality__card {
  padding: 20px 18px 22px;
  background: var(--s3-deep);
  border: 1px solid var(--s3-line);
  border-radius: var(--s3-radius);
}

.page-about .ab-quality__card--cool {
  border-left: 3px solid var(--s3-cyan);
  background-image: linear-gradient(120deg, rgba(0, 229, 208, 0.08), rgba(0, 229, 208, 0) 62%);
}

.page-about .ab-quality__card--hot {
  border-left: 3px solid var(--s3-orange);
  background-image: linear-gradient(120deg, rgba(255, 122, 26, 0.10), rgba(255, 122, 26, 0) 62%);
}

.page-about .ab-quality__time {
  display: block;
  margin: 8px 0 12px;
  font-family: var(--s3-font-mono);
  font-size: clamp(28px, 7.4vw, 44px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
}

.page-about .ab-quality__card--cool .ab-quality__time {
  color: var(--s3-cyan);
}

.page-about .ab-quality__card--hot .ab-quality__time {
  color: var(--s3-amber);
}

.page-about .ab-quality__card p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--s3-muted);
}

.page-about .ab-checks {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .ab-checks li {
  padding-left: 14px;
  border-left: 3px solid rgba(0, 229, 208, 0.55);
  font-size: 14px;
  line-height: 1.7;
  color: var(--s3-muted);
}

.page-about .ab-checks strong {
  display: block;
  margin-bottom: 4px;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--s3-text);
}

/* ---------- 下一程 ---------- */
.page-about .ab-next {
  display: grid;
  gap: 16px;
}

.page-about .ab-next article {
  padding: 18px 18px 20px;
  border-top: 2px solid var(--s3-line);
  background: linear-gradient(180deg, rgba(18, 34, 74, 0.55), rgba(12, 23, 48, 0.2));
  transition: border-color 0.2s var(--s3-ease);
}

.page-about .ab-next article:hover {
  border-top-color: var(--s3-cyan);
}

.page-about .ab-next h3 {
  margin: 0 0 8px;
  font-size: 17px;
  line-height: 1.35;
  color: var(--s3-text);
}

.page-about .ab-next p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--s3-muted);
}

/* ---------- 结尾 ---------- */
.page-about .ab-cta {
  margin-top: 30px;
  padding: 34px 0 46px;
  border-top: 1px solid var(--s3-line);
  background-image:
    radial-gradient(90% 130% at 0% 100%, rgba(0, 229, 208, 0.16), rgba(0, 229, 208, 0) 62%),
    radial-gradient(80% 130% at 100% 0%, rgba(255, 122, 26, 0.14), rgba(255, 122, 26, 0) 60%);
}

.page-about .ab-cta .s3-h2 {
  margin: 0 0 10px;
  font-size: clamp(22px, 5.4vw, 34px);
  line-height: 1.16;
  letter-spacing: -0.01em;
}

.page-about .ab-cta p {
  max-width: 34em;
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.72;
  color: var(--s3-muted);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 18px;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .ab-hero {
    padding: 40px 0 38px;
  }

  .page-about .ab-node {
    grid-template-columns: 88px 1fr;
    gap: 0 20px;
    padding: 24px 0;
  }

  .page-about .ab-checks {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero {
    padding: 56px 0 52px;
  }

  .page-about .ab-section {
    padding: 52px 0 58px;
  }

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

  .page-about .ab-team {
    grid-template-columns: 5fr 7fr;
    gap: 34px;
    align-items: start;
  }

  .page-about .ab-eco {
    grid-template-columns: 1fr 1fr;
    gap: 34px;
  }

  .page-about .ab-quality {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }

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

@media (min-width: 1180px) {
  .page-about .ab-hero__lede,
  .page-about .ab-lede,
  .page-about .ab-node__body p,
  .page-about .ab-cta p {
    font-size: 16px;
  }
}