.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about {
  --ab-gut: 34px;
  background: var(--gb-cream);
  color: var(--gb-ink);
  font-family: var(--gb-font-body);
  font-size: 1rem;
  line-height: 1.75;
  padding: clamp(14px, 2.5vw, 28px) 0 clamp(48px, 7vw, 96px);
  overflow-x: clip;
}

.page-about .ab-wrap {
  width: 100%;
  max-width: 1180px;
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 40px);
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--gb-font-head);
  letter-spacing: 0.02em;
  line-height: 1.22;
  margin: 0;
}

.page-about h2 {
  font-size: clamp(1.45rem, 3.6vw, 2.15rem);
}

.page-about h3 {
  font-size: clamp(1.02rem, 2.4vw, 1.26rem);
}

.page-about p {
  margin: 0.8rem 0 0;
  overflow-wrap: break-word;
}

.page-about .ab-num {
  font-family: var(--gb-font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  color: var(--gb-lake);
}

.page-about .ab-inline {
  color: var(--gb-lake);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.page-about .ab-inline:hover,
.page-about .ab-inline:focus-visible {
  color: var(--gb-ember);
}

.page-about .ab-crumbs {
  font-size: 0.84rem;
  padding-bottom: 0.6rem;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  display: grid;
  grid-template-columns: 1fr;
  border: var(--gb-bw) solid var(--gb-ink);
  box-shadow: var(--gb-shadow);
  background: var(--gb-white);
  margin-top: 0.5rem;
}

.page-about .ab-hero__main {
  background: var(--gb-dusk);
  background-image: radial-gradient(circle at 88% 8%, rgba(255, 249, 238, 0.16), transparent 58%);
  color: var(--gb-white);
  padding: clamp(22px, 4vw, 40px);
}

.page-about .ab-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  padding: 0.22rem 0.6rem;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  line-height: 1.6;
  color: var(--gb-gold);
  border: 1px solid rgba(255, 249, 238, 0.4);
  background: rgba(36, 26, 23, 0.18);
}

.page-about .ab-kicker::before {
  content: "";
  width: 16px;
  height: 2px;
  background: var(--gb-ember);
}

.page-about .ab-kicker--ink {
  color: var(--gb-dusk);
  border-color: var(--gb-line);
  background: transparent;
}

.page-about .ab-kicker--ink::before {
  background: var(--gb-ember);
}

.page-about .ab-hero h1 {
  margin-top: 0.85rem;
  font-size: clamp(1.8rem, 5.4vw, 2.85rem);
  color: var(--gb-white);
}

.page-about .ab-hero__lead {
  color: rgba(255, 249, 238, 0.86);
  font-size: clamp(0.95rem, 2.2vw, 1.03rem);
  max-width: 36em;
}

.page-about .ab-stats {
  list-style: none;
  margin: 1.5rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem 1rem;
}

.page-about .ab-stat {
  border-top: 2px solid rgba(255, 249, 238, 0.3);
  padding-top: 0.5rem;
  min-width: 0;
}

.page-about .ab-stat__num {
  display: block;
  font-family: var(--gb-font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(1.2rem, 3vw, 1.6rem);
  line-height: 1.1;
  color: var(--gb-gold);
}

.page-about .ab-stat__unit {
  display: block;
  margin-top: 0.15rem;
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: rgba(255, 249, 238, 0.78);
}

.page-about .ab-hero__side {
  padding: clamp(20px, 3.4vw, 32px);
  background: var(--gb-white);
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  min-width: 0;
}

.page-about .ab-side__title {
  margin: 0;
  font-size: 0.73rem;
  letter-spacing: 0.18em;
  color: var(--gb-dusk);
}

.page-about .ab-index {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .ab-index__link {
  display: grid;
  grid-template-columns: 2rem 1fr;
  align-items: baseline;
  gap: 0.4rem;
  padding: 0.55rem 0.5rem;
  text-decoration: none;
  color: var(--gb-ink);
  border: 2px solid transparent;
  border-left: 3px solid var(--gb-line);
  transition: background var(--gb-t) var(--gb-ease), border-color var(--gb-t) var(--gb-ease),
    transform var(--gb-t) var(--gb-ease);
}

.page-about .ab-index__link:hover,
.page-about .ab-index__link:focus-visible {
  background: rgba(47, 110, 142, 0.1);
  border-color: var(--gb-lake);
  transform: translateX(4px);
  outline: none;
}

.page-about .ab-index__num {
  font-family: var(--gb-font-mono);
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--gb-ember);
}

.page-about .ab-index__text {
  font-size: 0.88rem;
  line-height: 1.55;
  min-width: 0;
}

.page-about .ab-index__text b {
  font-family: var(--gb-font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--gb-dusk);
  margin-right: 0.45rem;
}

.page-about .ab-side__note {
  margin: 0;
  padding-top: 0.7rem;
  border-top: 2px dashed var(--gb-line);
  font-size: 0.82rem;
  color: var(--gb-dusk);
}

/* ---------- 通用区块 ---------- */
.page-about .ab-sec {
  margin-top: clamp(44px, 6.5vw, 88px);
}

.page-about .ab-sec__head {
  max-width: 44em;
  margin-bottom: clamp(22px, 3.6vw, 38px);
}

.page-about .ab-sec__lead {
  color: var(--gb-dusk);
  font-size: 0.97rem;
}

/* ---------- 品牌起点 ---------- */
.page-about .ab-origin__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3.4vw, 36px);
  align-items: start;
}

.page-about .ab-origin__figure {
  margin: 0;
  border: var(--gb-bw) solid var(--gb-ink);
  box-shadow: var(--gb-shadow-sm);
  background: var(--gb-white);
}

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

.page-about .ab-origin__figure figcaption,
.page-about .ab-space__figure figcaption,
.page-about .ab-team__figure figcaption {
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--gb-dusk);
  padding: 0.5rem 0.7rem;
  border-top: 2px solid var(--gb-ink);
  background: var(--gb-white);
}

.page-about .ab-mini {
  list-style: none;
  margin: 1.3rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.page-about .ab-mini li {
  position: relative;
  padding-left: 1.15rem;
  font-size: 0.92rem;
  color: var(--gb-dusk);
}

.page-about .ab-mini li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7em;
  width: 14px;
  height: 2px;
  background: var(--gb-gold);
}

.page-about .ab-mini b {
  display: block;
  color: var(--gb-ink);
  font-size: 0.9rem;
}

/* ---------- 时间轴 ---------- */
.page-about .ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  top: 0.5rem;
  bottom: 1.2rem;
  left: 7px;
  width: 3px;
  background: linear-gradient(180deg, var(--gb-lake), var(--gb-dusk) 55%, var(--gb-gold));
}

.page-about .ab-stop {
  position: relative;
  display: grid;
  grid-template-columns: var(--ab-gut) 1fr;
  padding-bottom: clamp(22px, 3.4vw, 40px);
  scroll-margin-top: 96px;
}

.page-about .ab-stop:last-child {
  padding-bottom: 0;
}

.page-about .ab-stop__dot {
  grid-column: 1;
  grid-row: 1;
  width: 15px;
  height: 15px;
  margin-top: 0.55rem;
  margin-left: 1px;
  border-radius: 50%;
  background: var(--gb-white);
  border: 3px solid var(--gb-lake);
  transition: background var(--gb-t) var(--gb-ease), border-color var(--gb-t) var(--gb-ease),
    transform var(--gb-t) var(--gb-ease);
}

.page-about .ab-stop:hover .ab-stop__dot,
.page-about .ab-stop:focus-within .ab-stop__dot {
  background: var(--gb-gold);
  border-color: var(--gb-ink);
  transform: scale(1.18);
}

.page-about .ab-stop__body {
  grid-column: 2;
  min-width: 0;
  padding: clamp(15px, 2.4vw, 24px);
  background: var(--gb-white);
  border: var(--gb-bw) solid var(--gb-ink);
  box-shadow: var(--gb-shadow-sm);
  transition: transform var(--gb-t) var(--gb-ease), box-shadow var(--gb-t) var(--gb-ease),
    border-color var(--gb-t) var(--gb-ease);
}

.page-about .ab-stop:hover .ab-stop__body,
.page-about .ab-stop:focus-within .ab-stop__body {
  transform: translate(-2px, -2px);
  box-shadow: var(--gb-shadow);
  border-color: var(--gb-lake);
}

.page-about .ab-stop__year {
  margin: 0;
  font-family: var(--gb-font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--gb-gold);
}

.page-about .ab-stop__body h3 {
  margin-top: 0.3rem;
}

.page-about .ab-stop__body p:not(.ab-stop__year) {
  font-size: 0.94rem;
}

.page-about .ab-more {
  margin-top: 0.85rem;
  border-top: 2px dashed var(--gb-line);
}

.page-about .ab-more summary {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.55rem 0 0.15rem;
  cursor: pointer;
  list-style: none;
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--gb-lake);
}

.page-about .ab-more summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-more summary::before {
  content: "+";
  font-family: var(--gb-font-mono);
  font-size: 1rem;
  line-height: 1;
  color: var(--gb-ember);
}

.page-about .ab-more[open] summary::before {
  content: "−";
}

.page-about .ab-more summary:focus-visible {
  outline: 2px solid var(--gb-ember);
  outline-offset: 2px;
}

.page-about .ab-more p {
  margin: 0.35rem 0 0.15rem;
  font-size: 0.9rem;
  color: var(--gb-dusk);
}

/* ---------- 空间 ---------- */
.page-about .ab-space__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.6vw, 40px);
  align-items: start;
}

.page-about .ab-facts {
  list-style: none;
  margin: 1.25rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.65rem;
}

.page-about .ab-facts li {
  position: relative;
  padding-left: 1.2rem;
  font-size: 0.94rem;
}

.page-about .ab-facts li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 15px;
  height: 2px;
  background: var(--gb-gold);
}

.page-about .ab-space__figure {
  position: relative;
  margin: 0;
  border: var(--gb-bw) solid var(--gb-ink);
  box-shadow: var(--gb-shadow);
  background: var(--gb-white);
}

.page-about .ab-figure__tag {
  position: absolute;
  top: -14px;
  left: 14px;
  z-index: 1;
  padding: 0.1rem 0.6rem;
  font-family: var(--gb-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--gb-ink);
  background: var(--gb-gold);
  border: 2px solid var(--gb-ink);
}

/* ---------- 团队 ---------- */
.page-about .ab-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3.6vw, 38px);
  align-items: start;
}

.page-about .ab-jobs {
  list-style: none;
  margin: 1.3rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.page-about .ab-job {
  display: grid;
  grid-template-columns: 2.2rem 1fr;
  gap: 0.7rem;
  align-items: start;
  padding: 0.7rem 0.85rem;
  min-width: 0;
  background: var(--gb-white);
  border: 2px solid var(--gb-line);
  border-left: 6px solid var(--gb-mist);
  transition: transform var(--gb-t) var(--gb-ease), box-shadow var(--gb-t) var(--gb-ease),
    border-color var(--gb-t) var(--gb-ease);
}

.page-about .ab-job:nth-child(1) {
  border-left-color: var(--gb-lake);
}
.page-about .ab-job:nth-child(2) {
  border-left-color: var(--gb-dusk);
}
.page-about .ab-job:nth-child(3) {
  border-left-color: var(--gb-gold);
}
.page-about .ab-job:nth-child(4) {
  border-left-color: var(--gb-pine);
}
.page-about .ab-job:nth-child(5) {
  border-left-color: var(--gb-rose);
}

.page-about .ab-job:hover,
.page-about .ab-job:focus-within {
  transform: translateX(4px);
  box-shadow: var(--gb-shadow-sm);
  border-color: var(--gb-ink);
}

.page-about .ab-job__no {
  font-family: var(--gb-font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--gb-ink);
  padding-top: 0.1rem;
}

.page-about .ab-job__name {
  margin: 0;
  font-weight: 700;
  color: var(--gb-ink);
  font-size: 0.95rem;
}

.page-about .ab-job__desc {
  margin: 0.1rem 0 0;
  font-size: 0.87rem;
  color: var(--gb-dusk);
}

.page-about .ab-team__note {
  font-size: 0.88rem;
  color: var(--gb-dusk);
  border-left: 4px solid var(--gb-pine);
  padding-left: 0.8rem;
}

.page-about .ab-team__figure {
  margin: 0;
  border: var(--gb-bw) solid var(--gb-ink);
  box-shadow: var(--gb-shadow-sm);
  background: var(--gb-white);
  max-width: 420px;
}

/* ---------- 合作生态 ---------- */
.page-about .ab-partners {
  padding: clamp(20px, 3.6vw, 40px);
  background: rgba(47, 110, 142, 0.09);
  border: 2px solid var(--gb-lake);
  box-shadow: var(--gb-shadow-sm);
}

.page-about .ab-partners__sticker {
  display: inline-block;
  margin-top: 1.1rem;
  padding: 0.35rem 0.85rem;
  font-size: 0.85rem;
  color: var(--gb-ink);
  background: var(--gb-white);
  border: 2px solid var(--gb-ink);
  box-shadow: var(--gb-shadow-sm);
}

.page-about .ab-pcards {
  list-style: none;
  margin: clamp(22px, 3.4vw, 34px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.9rem;
}

.page-about .ab-pcard {
  padding: 1rem 1.05rem;
  background: var(--gb-white);
  border: 2px solid var(--gb-ink);
  border-top: 6px solid var(--gb-lake);
  min-width: 0;
  transition: transform var(--gb-t) var(--gb-ease), box-shadow var(--gb-t) var(--gb-ease);
}

.page-about .ab-pcard--gold {
  border-top-color: var(--gb-gold);
}
.page-about .ab-pcard--pine {
  border-top-color: var(--gb-pine);
}

.page-about .ab-pcard:hover {
  transform: translateY(-3px);
  box-shadow: var(--gb-shadow-sm);
}

.page-about .ab-pcard h3 {
  font-size: 1.02rem;
}

.page-about .ab-pcard p {
  font-size: 0.88rem;
  color: var(--gb-dusk);
  margin-top: 0.4rem;
}

/* ---------- 下一步 ---------- */
.page-about .ab-next {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.9rem;
}

.page-about .ab-next__link {
  display: block;
  height: 100%;
  padding: 1rem 1.1rem;
  text-decoration: none;
  color: var(--gb-ink);
  background: var(--gb-white);
  border: 2px solid var(--gb-ink);
  box-shadow: var(--gb-shadow-sm);
  transition: transform var(--gb-t) var(--gb-ease), box-shadow var(--gb-t) var(--gb-ease),
    background var(--gb-t) var(--gb-ease);
}

.page-about .ab-next__link:hover,
.page-about .ab-next__link:focus-visible {
  transform: translate(-2px, -2px);
  box-shadow: var(--gb-shadow);
  background: rgba(194, 139, 60, 0.12);
  outline: none;
}

.page-about .ab-next__link h3 {
  font-size: 1rem;
}

.page-about .ab-next__link p {
  margin-top: 0.35rem;
  font-size: 0.88rem;
  color: var(--gb-dusk);
}

.page-about .ab-next__go {
  display: inline-block;
  margin-top: 0.5rem;
  font-family: var(--gb-font-mono);
  font-size: 1.05rem;
  color: var(--gb-ember);
}

.page-about .ab-cta {
  margin-top: clamp(22px, 3.4vw, 34px);
  display: grid;
  gap: 0.9rem;
  padding: clamp(18px, 3vw, 28px);
  background: var(--gb-ink);
  color: var(--gb-white);
  border-left: 8px solid var(--gb-gold);
}

.page-about .ab-cta__text {
  margin: 0;
  font-size: 0.95rem;
  color: rgba(255, 249, 238, 0.9);
}

.page-about .ab-cta__btn {
  justify-self: start;
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about {
    --ab-gut: 46px;
  }

  .page-about .ab-next {
    grid-template-columns: 1fr 1fr;
  }

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

  .page-about .ab-cta {
    grid-template-columns: 1fr auto;
    align-items: center;
  }

  .page-about .ab-hero__main {
    display: flex;
    flex-direction: column;
    justify-content: center;
  }
}

@media (min-width: 900px) {
  .page-about {
    --ab-gut: 58px;
  }

  .page-about .ab-hero {
    grid-template-columns: 1.04fr 0.96fr;
  }

  .page-about .ab-origin__grid {
    grid-template-columns: 0.92fr 1.08fr;
    gap: clamp(26px, 3.4vw, 44px);
  }

  .page-about .ab-origin__figure {
    margin-top: 1.5rem;
  }

  .page-about .ab-space__grid {
    grid-template-columns: 1.02fr 0.98fr;
    gap: clamp(30px, 4vw, 52px);
  }

  .page-about .ab-space__figure {
    margin-top: 1.8rem;
  }

  .page-about .ab-team__grid {
    grid-template-columns: 1.32fr 0.68fr;
    gap: clamp(28px, 4vw, 48px);
  }

  .page-about .ab-team__figure {
    margin-top: 2.4rem;
    max-width: none;
  }

  .page-about .ab-stop:nth-child(even) .ab-stop__body {
    margin-left: clamp(0px, 2.4vw, 28px);
  }

  .page-about .ab-stop:nth-child(odd) .ab-stop__body {
    margin-right: clamp(0px, 2.4vw, 28px);
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-index__link,
  .page-about .ab-stop__dot,
  .page-about .ab-stop__body,
  .page-about .ab-job,
  .page-about .ab-pcard,
  .page-about .ab-next__link {
    transition: none;
  }

  .page-about .ab-index__link:hover,
  .page-about .ab-index__link:focus-visible,
  .page-about .ab-job:hover,
  .page-about .ab-job:focus-within,
  .page-about .ab-stop:hover .ab-stop__body,
  .page-about .ab-stop:focus-within .ab-stop__body,
  .page-about .ab-next__link:hover,
  .page-about .ab-next__link:focus-visible {
    transform: none;
  }
}