.page-about {
  --ab-gap: clamp(24px, 4vw, 44px);
  --ab-axis: rgba(143, 166, 184, 0.28);
  padding-top: var(--j9-header-h);
  background-color: var(--j9-ink);
  background-image:
    radial-gradient(80% 55% at 88% -8%, rgba(0, 229, 255, 0.16), transparent 62%),
    radial-gradient(60% 45% at -6% 32%, rgba(255, 77, 46, 0.09), transparent 60%),
    linear-gradient(180deg, var(--j9-ink) 0%, var(--j9-ink-deep) 48%, var(--j9-ink) 100%);
  color: var(--j9-white);
  overflow-x: hidden;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--j9-font-display);
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .j9-section__title {
  font-size: clamp(24px, 3.6vw, 38px);
  line-height: 1.18;
}

.page-about .j9-section__lede {
  max-width: 62ch;
  color: var(--j9-mist);
}

.page-about .j9-figure__media img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 229, 255, 0.55), rgba(255, 77, 46, 0.45), transparent);
}

.page-about .ab-hero__inner {
  display: grid;
  gap: clamp(26px, 5vw, 46px);
  padding: clamp(22px, 5vw, 54px) 0 clamp(32px, 6vw, 66px);
}

.page-about .ab-hero__title {
  margin: 14px 0 16px;
  font-size: clamp(32px, 7vw, 58px);
  line-height: 1.06;
  letter-spacing: -0.025em;
}

.page-about .ab-hero__title em {
  font-style: normal;
  color: var(--j9-cyan);
  text-shadow: 0 0 26px rgba(0, 229, 255, 0.4);
}

.page-about .ab-hero__lede {
  margin: 0;
  max-width: 46ch;
  font-size: clamp(15px, 2.2vw, 17px);
  line-height: 1.75;
  color: var(--j9-mist);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

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

.page-about .ab-hero__media {
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--j9-ink-deep);
  border: 1px solid rgba(0, 229, 255, 0.28);
  clip-path: polygon(0 0, 100% 0, 100% 82%, 87% 100%, 0 100%);
}

.page-about .ab-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(20px, 4vw, 46px);
  margin: 0;
  padding: 22px 0 0;
  list-style: none;
  border-top: 1px solid var(--j9-line-soft);
}

.page-about .ab-fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .ab-fact__num {
  font-family: var(--j9-font-mono);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  color: var(--j9-cyan);
  line-height: 1;
}

.page-about .ab-fact:nth-child(3) .ab-fact__num {
  color: var(--j9-flame);
}

.page-about .ab-fact__label {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--j9-steel);
}

/* ---------- 起源 ---------- */
.page-about .ab-origin {
  position: relative;
}

.page-about .ab-origin__inner {
  display: grid;
  gap: var(--ab-gap);
}

.page-about .ab-origin__body p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--j9-mist);
}

.page-about .ab-origin__lead {
  font-size: clamp(17px, 2.4vw, 20px) !important;
  line-height: 1.7 !important;
  color: var(--j9-white) !important;
}

.page-about .ab-quote {
  margin: 26px 0 0;
  padding: 18px 22px;
  border-left: 3px solid var(--j9-flame);
  background: linear-gradient(90deg, rgba(255, 77, 46, 0.14), transparent 72%);
  font-size: clamp(15px, 2.2vw, 17px);
  line-height: 1.75;
  color: var(--j9-white);
}

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

.page-about .ab-principles li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  font-size: 14px;
  line-height: 1.7;
  color: var(--j9-mist);
}

.page-about .ab-principles__idx {
  font-family: var(--j9-font-mono);
  font-size: 12px;
  color: var(--j9-cyan);
  letter-spacing: 0.08em;
}

/* ---------- 价值观 ---------- */
.page-about .ab-values__grid {
  display: grid;
  gap: 1px;
  margin-top: clamp(24px, 4vw, 40px);
  background: var(--j9-line-soft);
  border: 1px solid var(--j9-line-soft);
}

.page-about .ab-value {
  position: relative;
  padding: clamp(24px, 3vw, 34px);
  background: linear-gradient(165deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.015));
}

.page-about .ab-value--cyan {
  border-top: 2px solid var(--j9-cyan);
}

.page-about .ab-value--flame {
  border-top: 2px solid var(--j9-flame);
}

.page-about .ab-value__idx {
  display: block;
  margin-bottom: 10px;
  font-family: var(--j9-font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--j9-steel);
}

.page-about .ab-value__title {
  margin: 0 0 12px;
  font-size: clamp(18px, 2.4vw, 21px);
  line-height: 1.35;
  color: var(--j9-white);
}

.page-about .ab-value__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--j9-mist);
}

/* ---------- 历程 ---------- */
.page-about .ab-timeline {
  position: relative;
  background-image: linear-gradient(180deg, rgba(255, 255, 255, 0.03), transparent 65%);
}

.page-about .ab-timeline__banner {
  margin: clamp(20px, 3vw, 32px) 0 clamp(28px, 4vw, 44px);
}

.page-about .ab-timeline__media {
  aspect-ratio: 3 / 1;
  overflow: hidden;
  background: var(--j9-ink-deep);
  border: 1px solid var(--j9-line-soft);
}

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

.page-about .ab-node {
  position: relative;
  padding: 0 0 clamp(26px, 4vw, 42px) clamp(26px, 5vw, 52px);
  border-left: 1px solid var(--ab-axis);
}

.page-about .ab-node:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .ab-node::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--j9-ink);
  border: 2px solid var(--j9-cyan);
  box-shadow: 0 0 12px rgba(0, 229, 255, 0.6);
}

.page-about .ab-node:last-child::before {
  border-color: var(--j9-flame);
  box-shadow: 0 0 12px rgba(255, 77, 46, 0.6);
}

.page-about .ab-node__idx {
  display: block;
  margin-bottom: 6px;
  font-family: var(--j9-font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--j9-steel);
}

.page-about .ab-node__title {
  margin: 0 0 10px;
  font-size: clamp(17px, 2.4vw, 21px);
  line-height: 1.35;
  color: var(--j9-white);
  transition: color 0.25s var(--j9-ease);
}

.page-about .ab-node__text {
  margin: 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--j9-mist);
}

.page-about .ab-node__detail {
  margin: 10px 0 0;
  max-width: 66ch;
  padding-left: 14px;
  border-left: 2px solid rgba(0, 229, 255, 0.4);
  font-size: 14px;
  line-height: 1.75;
  color: var(--j9-steel);
  opacity: 1;
}

/* ---------- 团队 ---------- */
.page-about .ab-team__inner {
  display: grid;
  gap: var(--ab-gap);
}

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

.page-about .ab-team__media {
  aspect-ratio: 8 / 5;
  overflow: hidden;
  background: var(--j9-ink-deep);
  border: 1px solid var(--j9-line-soft);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 12% 100%, 0 86%);
}

.page-about .ab-team__text {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--j9-mist);
}

.page-about .ab-team__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
  margin: 26px 0 0;
  padding: 22px 0 0;
  list-style: none;
  border-top: 1px solid var(--j9-line-soft);
}

.page-about .ab-team__stats .j9-stat__value {
  font-size: clamp(24px, 3.4vw, 36px);
}

.page-about .ab-team__note {
  margin: 22px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--j9-steel);
}

/* ---------- 承诺 ---------- */
.page-about .ab-promise__list {
  display: grid;
  gap: clamp(16px, 2.6vw, 26px);
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .ab-promise__item {
  padding: 22px 24px;
  background: linear-gradient(120deg, rgba(0, 229, 255, 0.08), rgba(255, 255, 255, 0.02));
  border-left: 2px solid rgba(0, 229, 255, 0.55);
}

.page-about .ab-promise__item:nth-child(3) {
  border-left-color: rgba(255, 77, 46, 0.6);
  background: linear-gradient(120deg, rgba(255, 77, 46, 0.1), rgba(255, 255, 255, 0.02));
}

.page-about .ab-promise__key {
  display: block;
  margin-bottom: 8px;
  font-family: var(--j9-font-display);
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--j9-white);
}

.page-about .ab-promise__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--j9-mist);
}

.page-about .ab-promise__cta {
  margin-top: clamp(28px, 4vw, 44px);
  padding: clamp(24px, 3.4vw, 36px);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--j9-line-soft);
  clip-path: polygon(0 0, 100% 0, 100% 88%, 96% 100%, 0 100%);
}

.page-about .ab-promise__cta-text {
  margin: 0 0 18px;
  font-size: clamp(15px, 2.2vw, 17px);
  line-height: 1.7;
  color: var(--j9-white);
}

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

/* ---------- 收束 ---------- */
.page-about .ab-outro {
  padding: clamp(40px, 8vw, 96px) 0 clamp(46px, 9vw, 110px);
}

.page-about .ab-outro__inner {
  text-align: center;
}

.page-about .ab-outro__line {
  margin: 0 0 10px;
  font-family: var(--j9-font-display);
  font-size: clamp(20px, 3.2vw, 28px);
  font-weight: 800;
  color: var(--j9-white);
}

.page-about .ab-outro__sub {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--j9-steel);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .ab-team__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
    align-items: center;
    row-gap: clamp(32px, 4vw, 50px);
  }

  .page-about .ab-hero__facts {
    grid-column: 1 / -1;
  }

  .page-about .ab-origin__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }

  .page-about .ab-origin__head {
    grid-column: 1 / -1;
  }

  .page-about .ab-origin__aside {
    padding-top: 6px;
  }

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

  .page-about .ab-timeline__list {
    max-width: 860px;
  }

  .page-about .ab-team__inner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    align-items: center;
  }

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

  .page-about .ab-promise__cta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
  }

  .page-about .ab-promise__cta-text {
    margin: 0;
    max-width: 52ch;
  }
}

@media (hover: hover) and (min-width: 900px) {
  .page-about .ab-node__detail {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 0.45s var(--j9-ease), opacity 0.3s var(--j9-ease), margin-top 0.3s var(--j9-ease);
  }

  .page-about .ab-node:hover .ab-node__detail,
  .page-about .ab-node:focus-within .ab-node__detail {
    max-height: 220px;
    margin-top: 10px;
    opacity: 1;
  }

  .page-about .ab-node:hover .ab-node__title,
  .page-about .ab-node:focus-within .ab-node__title {
    color: var(--j9-cyan);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-node__detail,
  .page-about .ab-node__title {
    transition: none;
  }
}