/* ═══ 品牌中心 / page-about ═══ */
.page-about {
  --ab-block: clamp(56px, 8vw, 116px);
  --ab-gap: clamp(22px, 4vw, 48px);
  position: relative;
}

.page-about .section {
  padding-block: var(--ab-block);
}

.page-about h2 {
  font-size: clamp(26px, 3.6vw, 44px);
  line-height: 1.14;
  letter-spacing: -.01em;
  margin: 8px 0 0;
}

.page-about h3 {
  font-size: clamp(17px, 1.6vw, 20px);
  line-height: 1.35;
  margin: 0 0 8px;
}

.page-about p {
  color: var(--muted);
  line-height: 1.8;
  margin: 0;
}

.page-about .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.page-about .section__head {
  margin-bottom: clamp(28px, 4vw, 52px);
  max-width: 42ch;
}

/* ── 首屏 ── */
.page-about .ab-hero {
  position: relative;
  padding: clamp(44px, 7vw, 104px) 0 clamp(34px, 5vw, 72px);
  overflow: hidden;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -14%;
  width: min(680px, 80vw);
  aspect-ratio: 1;
  background: radial-gradient(circle at 62% 42%, rgba(34, 227, 196, .15), transparent 66%);
  pointer-events: none;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: min(420px, 50vw);
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), transparent);
  opacity: .55;
}

.page-about .ab-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 5vw, 56px);
  align-items: start;
}

.page-about .crumbs {
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-about .ab-hero__title {
  font-size: clamp(36px, 7.6vw, 84px);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -.022em;
  margin: clamp(10px, 2vw, 18px) 0 clamp(18px, 3vw, 28px);
}

.page-about .ab-hero__title em {
  font-style: normal;
  color: var(--cyan);
}

.page-about .ab-hero__marks {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: clamp(18px, 3.4vw, 44px);
}

.page-about .ab-hero__marks li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .ab-hero__marks .mono {
  font-size: clamp(26px, 3.6vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .ab-hero__marks li > span:last-child {
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--muted);
}

.page-about .ab-hero__card {
  position: relative;
  padding: clamp(26px, 3.6vw, 44px);
  background: var(--ink-800);
  border: 1px solid var(--line);
  clip-path: var(--notch);
  overflow: hidden;
}

.page-about .ab-hero__quote {
  position: absolute;
  top: -6px;
  right: 14px;
  font-size: clamp(90px, 14vw, 148px);
  line-height: 1;
  color: var(--cyan);
  opacity: .12;
  pointer-events: none;
  user-select: none;
}

.page-about .ab-hero__claim {
  position: relative;
  color: var(--text);
  font-size: clamp(19px, 2.4vw, 26px);
  font-weight: 700;
  line-height: 1.4;
  margin: 0 0 14px;
}

.page-about .ab-hero__note {
  position: relative;
  font-size: 15px;
}

/* ── 三条内容线 ── */
.page-about .ab-lines__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--ab-gap);
}

.page-about .ab-line {
  position: relative;
  padding: clamp(24px, 3vw, 34px);
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
  clip-path: var(--notch);
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: background .32s var(--ease), border-color .32s var(--ease);
}

.page-about .ab-line:hover {
  background: var(--ink-700);
  border-left-color: var(--cyan-soft);
}

.page-about .ab-line__idx {
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--cyan);
}

.page-about .ab-line h3 {
  color: var(--text);
  margin: 0;
}

.page-about .ab-line p {
  font-size: 15px;
  flex: 1 1 auto;
}

.page-about .ab-line__link {
  align-self: flex-start;
  margin-top: 6px;
  font-size: 14px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .24s var(--ease), color .24s var(--ease);
}

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

/* ── 团队 ── */
.page-about .ab-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 5vw, 64px);
  align-items: start;
}

.page-about .ab-team__lede {
  margin-top: 16px;
  max-width: 46ch;
}

.page-about .ab-team__stats {
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-team__stat {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-team__stat dt {
  font-size: 15px;
  color: var(--muted);
  letter-spacing: .04em;
}

.page-about .ab-team__stat dd {
  margin: 0;
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 700;
  color: var(--text);
  line-height: 1;
}

.page-about .ab-team__figure {
  margin: 0;
  position: relative;
  border: 1px solid var(--line);
  clip-path: var(--notch);
  overflow: hidden;
  background: var(--ink-800);
}

.page-about .ab-team__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  filter: saturate(.9);
}

.page-about .ab-team__figure figcaption {
  padding: 12px 18px;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

/* ── 时间轴 ── */
.page-about .ab-timeline__banner {
  margin: 0 0 clamp(32px, 5vw, 60px);
  border: 1px solid var(--line);
  clip-path: var(--notch);
  overflow: hidden;
}

.page-about .ab-timeline__banner img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  opacity: .78;
}

.page-about .ab-tl {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: var(--line);
}

.page-about .ab-tl__item {
  position: relative;
}

.page-about .ab-tl__item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 24px;
  width: 9px;
  height: 9px;
  background: var(--ink-900);
  border: 2px solid var(--cyan);
  transform: rotate(45deg);
}

.page-about .ab-tl__card {
  background: var(--ink-800);
  border: 1px solid var(--line);
  clip-path: var(--notch-sm);
  overflow: hidden;
  transition: border-color .3s var(--ease), background .3s var(--ease);
}

.page-about .ab-tl__card:hover {
  background: var(--ink-700);
  border-color: var(--line);
}

.page-about .ab-tl__btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 20px;
  background: none;
  border: 0;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

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

.page-about .ab-tl__year {
  font-size: clamp(20px, 2.2vw, 26px);
  font-weight: 700;
  color: var(--cyan);
  line-height: 1;
  letter-spacing: .02em;
}

.page-about .ab-tl__name {
  flex: 1 1 auto;
  font-size: clamp(15px, 1.5vw, 18px);
  font-weight: 600;
  color: var(--text);
}

.page-about .ab-tl__sign {
  position: relative;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
}

.page-about .ab-tl__sign::before,
.page-about .ab-tl__sign::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: transform .24s var(--ease), opacity .24s var(--ease);
}

.page-about .ab-tl__sign::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 2px;
}

.page-about .ab-tl__sign::after {
  left: 6px;
  top: 0;
  width: 2px;
  height: 14px;
}

.page-about .ab-tl__btn[aria-expanded="true"] .ab-tl__sign::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .ab-tl__panel {
  padding: 0 20px 20px;
}

.page-about .ab-tl__panel[hidden] {
  display: none;
}

.page-about .ab-tl__panel p {
  font-size: 15px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

/* ── 五道关 ── */
.page-about .ab-flow {
  position: relative;
}

.page-about .ab-flow__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 5vw, 60px);
  align-items: start;
}

.page-about .ab-flow__lede {
  margin-top: 16px;
  max-width: 44ch;
}

.page-about .ab-flow__list {
  list-style: none;
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
  counter-reset: flow;
}

.page-about .ab-flow__list li {
  display: flex;
  gap: 18px;
  align-items: flex-start;
  padding: 16px 0 16px 4px;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-flow__num {
  flex: 0 0 auto;
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--red);
  padding-top: 4px;
}

.page-about .ab-flow__list h3 {
  color: var(--text);
  margin: 0 0 6px;
}

.page-about .ab-flow__list p {
  font-size: 14.5px;
}

.page-about .ab-flow__visual {
  position: relative;
  border: 1px solid var(--line);
  clip-path: var(--notch);
  overflow: hidden;
  background: var(--ink-800);
  min-height: 220px;
}

.page-about .ab-flow__visual img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  opacity: .5;
}

.page-about .ab-flow__track {
  position: absolute;
  inset: 6% 12%;
  width: 76%;
  height: 88%;
  pointer-events: none;
}

/* ── 合作生态 ── */
.page-about .ab-partners__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 5vw, 60px);
  align-items: center;
}

.page-about .ab-partners__copy > p {
  margin-top: 16px;
  max-width: 48ch;
}

.page-about .ab-partners__group {
  margin-top: 14px;
  border: 1px solid var(--line);
  background: var(--ink-800);
  clip-path: var(--notch-sm);
  overflow: hidden;
}

.page-about .ab-partners__group:first-of-type {
  margin-top: clamp(24px, 3.5vw, 36px);
}

.page-about .ab-partners__btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  background: none;
  border: 0;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

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

.page-about .ab-partners__tag {
  flex: 0 0 auto;
}

.page-about .ab-partners__hint {
  flex: 1 1 auto;
  font-size: 14px;
  color: var(--muted);
}

.page-about .ab-partners__sign {
  position: relative;
  flex: 0 0 auto;
  width: 12px;
  height: 12px;
}

.page-about .ab-partners__sign::before,
.page-about .ab-partners__sign::after {
  content: "";
  position: absolute;
  background: var(--cyan);
  transition: transform .24s var(--ease), opacity .24s var(--ease);
}

.page-about .ab-partners__sign::before {
  left: 0;
  top: 5px;
  width: 12px;
  height: 2px;
}

.page-about .ab-partners__sign::after {
  left: 5px;
  top: 0;
  width: 2px;
  height: 12px;
}

.page-about .ab-partners__btn[aria-expanded="true"] .ab-partners__sign::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .ab-partners__panel {
  padding: 0 18px 18px;
}

.page-about .ab-partners__panel[hidden] {
  display: none;
}

.page-about .ab-partners__panel p {
  font-size: 14.5px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.page-about .ab-partners__ring {
  position: relative;
  width: min(320px, 74vw);
  aspect-ratio: 1;
  margin: 0 auto;
}

.page-about .ab-partners__orbit {
  position: absolute;
  inset: 0;
  border: 1px dashed var(--line);
  border-radius: 50%;
}

.page-about .ab-partners__orbit::after {
  content: "";
  position: absolute;
  inset: 22%;
  border: 1px solid var(--line);
  border-radius: 50%;
}

.page-about .ab-partners__core {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: clamp(34px, 6vw, 52px);
  font-weight: 700;
  color: var(--cyan);
  line-height: 1;
}

.page-about .ab-partners__dot {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 7px;
  height: 7px;
  margin: -3.5px 0 0 -3.5px;
  border-radius: 50%;
  background: var(--cyan);
  transform: rotate(calc(var(--i) * 30deg)) translateY(-50%) translateX(50%);
  box-shadow: 0 0 8px rgba(34, 227, 196, .5);
}

.page-about .ab-partners__dot:nth-child(3n) {
  background: var(--gold);
  box-shadow: 0 0 8px rgba(232, 178, 76, .45);
}

.page-about .ab-partners__dot:nth-child(4n) {
  background: var(--red);
  box-shadow: 0 0 8px rgba(226, 59, 59, .45);
}

/* ── 运营规模 ── */
.page-about .ab-scale__grid {
  margin-top: clamp(28px, 4vw, 48px);
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-scale__item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 18px;
  padding: clamp(16px, 2.4vw, 24px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .ab-scale__num {
  font-size: clamp(34px, 6vw, 62px);
  font-weight: 700;
  line-height: 1;
  color: var(--text);
  letter-spacing: -.01em;
  order: 1;
}

.page-about .ab-scale__item p {
  order: 2;
  font-size: 14px;
  letter-spacing: .05em;
  color: var(--muted);
}

.page-about .ab-scale__note {
  margin-top: clamp(22px, 3vw, 34px);
  max-width: 66ch;
  font-size: 15px;
  padding-left: 18px;
  border-left: 2px solid var(--gold);
}

/* ── 下一步 ── */
.page-about .ab-next__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
  align-items: start;
}

.page-about .ab-next__head p {
  margin-top: 14px;
  max-width: 40ch;
}

.page-about .ab-next__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.page-about .ab-next__links a {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 16px 20px;
  background: var(--ink-800);
  border: 1px solid var(--line);
  clip-path: var(--notch-sm);
  text-decoration: none;
  transition: background .28s var(--ease), transform .28s var(--ease);
}

.page-about .ab-next__links a:hover,
.page-about .ab-next__links a:focus-visible {
  background: var(--ink-700);
  transform: translateX(4px);
}

.page-about .ab-next__label {
  font-size: 16px;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .ab-next__desc {
  font-size: 13.5px;
  color: var(--muted);
  line-height: 1.6;
}

/* ── 渐显 ── */
.page-about [data-reveal] {
  opacity: 1;
}

@media (prefers-reduced-motion: no-preference) {
  .page-about [data-reveal] {
    animation: ab-rise .6s var(--ease) both;
  }
  .page-about [data-reveal="1"] { animation-delay: .04s; }
  .page-about [data-reveal="2"] { animation-delay: .12s; }
  .page-about [data-reveal="3"] { animation-delay: .2s; }
  .page-about [data-reveal="4"] { animation-delay: .28s; }
  .page-about [data-reveal="5"] { animation-delay: .36s; }
}

@keyframes ab-rise {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ═══ 响应式 ═══ */
@media (min-width: 640px) {
  .page-about .ab-team__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(20px, 3vw, 40px);
  }
  .page-about .ab-team__stat:nth-last-child(-n+1) {
    grid-column: 1 / -1;
  }
  .page-about .ab-scale__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 4vw, 56px);
  }
  .page-about .ab-next__links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.42fr) minmax(0, .88fr);
    align-items: center;
    gap: clamp(36px, 5vw, 72px);
  }

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

  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: center;
  }

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

  .page-about .ab-team__figure img {
    aspect-ratio: 4 / 5;
  }

  /* 时间轴：居中轨道，左右交替 */
  .page-about .ab-tl {
    padding-left: 0;
    gap: 6px;
  }

  .page-about .ab-tl::before {
    left: 50%;
    top: 12px;
    bottom: 12px;
  }

  .page-about .ab-tl__item {
    width: 50%;
    padding-right: clamp(28px, 3.6vw, 52px);
  }

  .page-about .ab-tl__item:nth-child(even) {
    margin-left: 50%;
    padding-right: 0;
    padding-left: clamp(28px, 3.6vw, 52px);
  }

  .page-about .ab-tl__item::before {
    left: auto;
    right: -4.5px;
    top: 30px;
  }

  .page-about .ab-tl__item:nth-child(even)::before {
    left: -4.5px;
    right: auto;
  }

  .page-about .ab-flow__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: center;
  }

  .page-about .ab-partners__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  }

  .page-about .ab-next__grid {
    grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr);
  }
}

@media (min-width: 1120px) {
  .page-about .ab-team__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .ab-team__stat:nth-last-child(-n+1) {
    grid-column: auto;
  }
}

@media (max-width: 899px) {
  .page-about .ab-flow__visual {
    order: -1;
  }
  .page-about .ab-partners__ring {
    order: -1;
    margin-bottom: 8px;
  }
}
<<<END>>>

.page-about {
  --i: inherit;
}