.page-about {
  --ab-pad: clamp(44px, 6.5vw, 92px);
  --ab-gap: clamp(16px, 2.2vw, 26px);
  background: var(--ink);
  color: var(--ice);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: calc(var(--head-h) + 18px) 0 52px;
  overflow: hidden;
}
.page-about .ab-hero::before {
  content: "";
  position: absolute;
  left: -35%;
  right: -35%;
  top: -18%;
  height: 78%;
  background:
    radial-gradient(60% 70% at 22% 30%, rgba(140, 91, 255, .55), transparent 70%),
    radial-gradient(55% 65% at 78% 12%, rgba(53, 242, 208, .28), transparent 72%);
  clip-path: polygon(0 0, 100% 0, 100% 58%, 0 100%);
  pointer-events: none;
}
.page-about .ab-hero .wrap {
  position: relative;
  z-index: 1;
}
.page-about .ab-hero .breadcrumb {
  margin-bottom: 22px;
  font-size: 13px;
  color: var(--mist);
}
.page-about .ab-hero-grid {
  display: grid;
  gap: var(--ab-gap);
}
.page-about .ab-hero-copy {
  position: relative;
}
.page-about .ab-annot {
  margin: 0 0 12px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .3em;
  text-transform: uppercase;
  color: var(--orange);
}
.page-about .ab-title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 8.4vw, 80px);
  line-height: 1.05;
  letter-spacing: -.02em;
  transform: skewX(-2.5deg);
}
.page-about .ab-title span {
  color: var(--orange);
}
.page-about .ab-lede {
  margin: 0 0 26px;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
}
.page-about .ab-stat-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 30px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}
.page-about .ab-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.page-about .ab-stat-num {
  font-family: var(--font-display);
  font-size: clamp(24px, 4.4vw, 34px);
  font-weight: 800;
  color: var(--cyan);
  letter-spacing: -.01em;
}
.page-about .ab-stat-label {
  font-size: 12.5px;
  color: var(--mist);
  letter-spacing: .04em;
}
.page-about .ab-hero-media {
  margin: 0;
  clip-path: polygon(0 0, 100% 5%, 100% 100%, 0 94%);
}
.page-about .ab-hero-media img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 章节索引 ---------- */
.page-about .ab-index {
  position: sticky;
  top: var(--head-h);
  z-index: 6;
  background: rgba(7, 20, 38, .94);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
}
.page-about .ab-index-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 10px 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}
.page-about .ab-index-list::-webkit-scrollbar {
  display: none;
}
.page-about .ab-index-list a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}
.page-about .ab-index-list a:hover,
.page-about .ab-index-list a:focus-visible {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}
.page-about .ab-index-num {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .06em;
  opacity: .8;
}

/* ---------- 通用章节 ---------- */
.page-about .ab-section {
  padding: var(--ab-pad) 0;
}
.page-about .ab-section--panel {
  background: var(--panel);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.page-about .ab-section .section-head {
  margin-bottom: 28px;
}
.page-about .ab-section .section-title {
  transform: skewX(-2deg);
  line-height: 1.16;
  margin-top: 6px;
}
.page-about .ab-lead {
  max-width: 62ch;
  margin: 0 0 26px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist);
}
.page-about a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 208, .35);
}
.page-about a:hover,
.page-about a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 出发 ---------- */
.page-about .ab-origin-main p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}
.page-about .ab-origin-main p:first-child {
  color: var(--ice);
  font-size: 17px;
}
.page-about .ab-origin-side {
  padding: 22px 20px;
  border-radius: var(--r-lg);
  align-self: start;
}
.page-about .ab-side-title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  color: var(--ice);
}
.page-about .ab-side-list {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .ab-side-list li {
  display: grid;
  grid-template-columns: 10px 1fr;
  gap: 10px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--mist);
}
.page-about .ab-side-list .dot {
  margin-top: 8px;
}
.page-about .ab-side-note {
  margin: 0;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 原则 ---------- */
.page-about .ab-principles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--ab-gap);
}
.page-about .ab-principle {
  position: relative;
  padding: 24px 20px 22px;
  background: var(--ink);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  transition: border-color .25s var(--ease), transform .25s var(--ease);
}
.page-about .ab-principle::before {
  content: "";
  position: absolute;
  left: 20px;
  top: 0;
  width: 44px;
  height: 3px;
  background: var(--orange);
  transition: background .25s var(--ease), width .25s var(--ease);
}
.page-about .ab-principle:hover,
.page-about .ab-principle:focus-within {
  border-color: var(--cyan);
  transform: translateY(-4px);
}
.page-about .ab-principle:hover::before,
.page-about .ab-principle:focus-within::before {
  background: var(--cyan);
  width: 84px;
}
.page-about .ab-principle h3 {
  margin: 14px 0 10px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.4vw, 23px);
  font-weight: 800;
  line-height: 1.35;
  color: var(--ice);
}
.page-about .ab-principle p {
  margin: 0 0 12px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}
.page-about .ab-principle-foot {
  margin: 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-size: 13px;
  color: var(--ice);
  opacity: .85;
}

/* ---------- 产品线轨道 ---------- */
.page-about .ab-track {
  list-style: none;
  display: flex;
  gap: 14px;
  margin: 0 0 18px;
  padding: 4px 0 18px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
}
.page-about .ab-line-card {
  flex: 0 0 min(80vw, 300px);
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px 18px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  position: relative;
  overflow: hidden;
}
.page-about .ab-line-card::after {
  content: "";
  position: absolute;
  right: -40px;
  bottom: -40px;
  width: 110px;
  height: 110px;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(140, 91, 255, .35), transparent 70%);
  pointer-events: none;
}
.page-about .ab-line-card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  color: var(--ice);
}
.page-about .ab-line-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}
.page-about .ab-track-note {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 时间线 ---------- */
.page-about .ab-tl-media {
  margin: 0 0 30px;
}
.page-about .ab-tl-media img {
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
}
.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--violet) 55%, var(--orange));
  opacity: .85;
}
.page-about .ab-timeline > li {
  position: relative;
  padding-bottom: 26px;
}
.page-about .ab-timeline > li:last-child {
  padding-bottom: 0;
}
.page-about .ab-tl-node {
  position: absolute;
  left: -26px;
  top: 4px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--panel);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(53, 242, 208, .12);
}
.page-about .ab-timeline > li:nth-child(3) .ab-tl-node {
  border-color: var(--violet);
  box-shadow: 0 0 0 4px rgba(140, 91, 255, .14);
}
.page-about .ab-timeline > li:nth-child(4) .ab-tl-node {
  border-color: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 158, 61, .14);
}
.page-about .ab-tl-phase {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--orange);
  text-transform: uppercase;
}
.page-about .ab-tl-body h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 800;
  color: var(--ice);
  line-height: 1.4;
}
.page-about .ab-tl-body > p {
  margin: 0 0 10px;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
}
.page-about .ab-tl-body details {
  border-top: 1px dashed var(--line);
  padding-top: 10px;
  max-width: 62ch;
}
.page-about .ab-tl-body summary {
  cursor: pointer;
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--cyan);
  padding: 4px 0;
}
.page-about .ab-tl-body summary::-webkit-details-marker {
  display: none;
}
.page-about .ab-tl-body summary::before {
  content: "+";
  display: inline-block;
  width: 16px;
  text-align: center;
  font-weight: 700;
  color: var(--orange);
}
.page-about .ab-tl-body details[open] summary::before {
  content: "−";
}
.page-about .ab-tl-detail {
  padding: 8px 0 2px;
}
.page-about .ab-tl-detail p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  gap: var(--ab-gap);
}
.page-about .ab-team-media {
  margin: 0;
  align-self: start;
}
.page-about .ab-team-media img {
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .ab-team-body > p {
  margin: 0 0 20px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--mist);
}
.page-about .ab-team-grid {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: grid;
  gap: 14px;
}
.page-about .ab-team-grid li {
  padding: 16px 16px 14px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
  border-radius: var(--r-sm);
  background: var(--panel);
}
.page-about .ab-team-grid li:nth-child(2) {
  border-left-color: var(--orange);
}
.page-about .ab-team-grid li:nth-child(3) {
  border-left-color: var(--violet);
}
.page-about .ab-team-grid li:nth-child(4) {
  border-left-color: var(--mist);
}
.page-about .ab-team-num {
  display: block;
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .18em;
  color: var(--orange);
  margin-bottom: 6px;
}
.page-about .ab-team-grid h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 800;
  color: var(--ice);
}
.page-about .ab-team-grid p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mist);
}
.page-about .ab-team-note {
  margin: 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 伙伴 ---------- */
.page-about .ab-partners {
  display: grid;
  gap: var(--ab-gap);
}
.page-about .ab-partner-copy p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--mist);
}
.page-about .ab-partner-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .ab-partner-list li {
  padding: 16px;
  background: var(--ink);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
}
.page-about .ab-partner-list p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}
.page-about .ab-exchange {
  margin-top: 26px;
  padding: 22px 20px;
  border: 1px dashed var(--line);
  border-radius: var(--r-lg);
  background: linear-gradient(120deg, rgba(140, 91, 255, .16), transparent 65%);
}
.page-about .ab-exchange-num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(28px, 5vw, 40px);
  font-weight: 900;
  color: var(--cyan);
  letter-spacing: -.01em;
  margin-bottom: 8px;
}
.page-about .ab-exchange p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--mist);
}

/* ---------- 支持 ---------- */
.page-about .ab-support {
  display: grid;
  gap: var(--ab-gap);
}
.page-about .ab-support-card {
  padding: 22px 20px;
  border-radius: var(--r-lg);
}
.page-about .ab-support-title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  color: var(--ice);
}
.page-about .ab-contact-row {
  display: grid;
  gap: 3px;
  padding: 12px 0;
  border-bottom: 1px dashed var(--line);
}
.page-about .ab-contact-row:last-of-type {
  border-bottom: 0;
}
.page-about .ab-contact-label {
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--orange);
}
.page-about .ab-contact-value {
  font-size: 15px;
  font-weight: 600;
  color: var(--ice);
  word-break: break-word;
}
.page-about .ab-support-note {
  margin: 12px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}
.page-about .ab-support-actions p {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}
.page-about .ab-btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 18px;
}
.page-about .ab-support-fine {
  font-size: 13.5px;
  color: var(--mist);
  margin: 0;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .ab-hero {
    padding-top: calc(var(--head-h) + 26px);
  }
  .page-about .ab-team-grid {
    grid-template-columns: 1fr 1fr;
  }
  .page-about .ab-partner-list {
    grid-template-columns: 1fr 1fr 1fr;
  }
  .page-about .ab-contact-row {
    grid-template-columns: 96px 1fr;
    align-items: baseline;
    gap: 12px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero {
    padding: 46px 0 92px;
  }
  .page-about .ab-hero-grid {
    grid-template-columns: 7fr 5fr;
    align-items: center;
    gap: clamp(24px, 3.4vw, 48px);
  }
  .page-about .ab-hero-copy {
    padding-left: 46px;
  }
  .page-about .ab-annot {
    position: absolute;
    left: 0;
    top: 4px;
    writing-mode: vertical-rl;
    letter-spacing: .34em;
    margin: 0;
  }
  .page-about .ab-index {
    top: 0;
  }
  .page-about .ab-principles {
    grid-template-columns: repeat(3, 1fr);
    align-items: start;
  }
  .page-about .ab-principle:nth-child(2) {
    transform: translateY(26px);
  }
  .page-about .ab-principle:nth-child(3) {
    transform: translateY(9px);
  }
  .page-about .ab-principle:nth-child(2):hover,
  .page-about .ab-principle:nth-child(2):focus-within {
    transform: translateY(22px);
  }
  .page-about .ab-principle:nth-child(3):hover,
  .page-about .ab-principle:nth-child(3):focus-within {
    transform: translateY(5px);
  }
  .page-about .ab-line-card {
    flex-basis: 320px;
  }
  .page-about .ab-team {
    grid-template-columns: 5fr 7fr;
    align-items: start;
    gap: clamp(24px, 3.4vw, 46px);
  }
  .page-about .ab-team-media {
    margin-top: 34px;
  }
  .page-about .ab-partners {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }
  .page-about .ab-support {
    grid-template-columns: 5fr 7fr;
    align-items: start;
  }
  .page-about .ab-timeline {
    padding-left: 34px;
  }
  .page-about .ab-timeline::before {
    left: 8px;
  }
  .page-about .ab-tl-node {
    left: -34px;
    width: 18px;
    height: 18px;
  }
}

@media (min-width: 1180px) {
  .page-about .ab-line-card {
    flex: 1 1 0;
    flex-basis: 0;
    min-width: 0;
  }
  .page-about .ab-track {
    overflow-x: visible;
    flex-wrap: nowrap;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-principle,
  .page-about .ab-index-list a {
    transition: none;
  }
  .page-about .ab-principle:hover,
  .page-about .ab-principle:focus-within {
    transform: none;
  }
}
</final>