.page-about {
  --ab-rail: 68px;
  --ab-pad: clamp(20px, 4vw, 34px);
  display: block;
  color: var(--fh-bone);
  background:
    radial-gradient(900px 420px at 84% -8%, rgba(255, 90, 31, .15), transparent 62%),
    radial-gradient(780px 380px at -12% 18%, rgba(79, 195, 247, .10), transparent 60%),
    var(--fh-ink);
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .fh-crumb {
  padding-block: 18px 0;
  font-size: 12px;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding-block: clamp(26px, 4vw, 48px) clamp(20px, 3vw, 36px);
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  left: -10%;
  right: -10%;
  bottom: 4px;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 90, 31, .55) 32%, rgba(79, 195, 247, .38) 72%, transparent);
  transform: rotate(-3.2deg);
  pointer-events: none;
}

.page-about .ab-hero > * {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero__tag {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  padding: 7px 15px;
  border: 1px solid rgba(79, 195, 247, .3);
  border-radius: 999px;
  background: rgba(79, 195, 247, .07);
  color: var(--fh-ice);
  font-size: 11.5px;
  letter-spacing: .07em;
}

.page-about .ab-hero__title {
  margin: 24px 0 0;
  max-width: 17ch;
  font-size: clamp(2.05rem, 7.4vw, 4.1rem);
  line-height: 1.05;
  letter-spacing: -.012em;
}

.page-about .ab-hero__lede {
  margin-top: 24px;
  max-width: 62ch;
  color: var(--fh-mist);
}

.page-about .ab-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

/* ---------- 概要数据条 ---------- */
.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border: 1px solid var(--fh-line);
  border-radius: var(--fh-radius-sm);
  background: linear-gradient(180deg, rgba(255, 90, 31, .05), transparent 70%), var(--fh-ink-2);
  overflow: hidden;
}

.page-about .ab-stats__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 18px 22px;
  border-right: 1px solid var(--fh-line);
  border-bottom: 1px solid var(--fh-line);
}

.page-about .ab-stats__item:nth-child(2n) {
  border-right: 0;
}

.page-about .ab-stats__item:nth-child(n + 3) {
  border-bottom: 0;
}

.page-about .ab-stats__num {
  font-size: clamp(1.45rem, 4.6vw, 2.1rem);
  line-height: 1;
  letter-spacing: -.02em;
}

.page-about .ab-stats .fh-stat__label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--fh-mist);
}

/* ---------- 通用章节头 ---------- */
.page-about .ab-head {
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .ab-head .fh-h2 {
  max-width: 22ch;
}

.page-about .ab-head .fh-lede {
  margin-top: 14px;
  color: var(--fh-mist);
}

/* ---------- 品牌起源 ---------- */
.page-about .ab-origin__media {
  width: 100%;
}

.page-about .ab-origin__body {
  display: grid;
  gap: 18px;
  max-width: 72ch;
  margin-top: clamp(26px, 4vw, 40px);
}

.page-about .ab-origin__body p {
  margin: 0;
  color: var(--fh-mist);
  font-size: 1rem;
  line-height: 1.85;
}

.page-about .ab-origin__body p:first-child {
  color: var(--fh-bone);
  font-size: 1.06rem;
}

.page-about .ab-origin__body .fh-note {
  padding-left: 14px;
  border-left: 2px solid var(--fh-gold);
  color: var(--fh-dim);
  font-size: 12.5px;
  line-height: 1.75;
}

/* ---------- 时间线 ---------- */
.page-about .ab-city {
  margin-bottom: clamp(28px, 5vw, 48px);
}

.page-about .ab-tl__row {
  position: relative;
  display: grid;
  grid-template-columns: var(--ab-rail) minmax(0, 1fr);
  gap: 14px;
  padding-block: 22px;
  border-top: 1px solid var(--fh-line);
}

.page-about .ab-tl__row:last-child {
  border-bottom: 1px solid var(--fh-line);
}

.page-about .ab-tl__row::before {
  content: "";
  position: absolute;
  left: 0;
  top: 30px;
  width: 12px;
  height: 1px;
  background: var(--fh-line-strong);
  transition: background .3s var(--fh-ease), width .3s var(--fh-ease);
}

.page-about .ab-tl__row.is-in::before {
  width: 20px;
  background: var(--fh-lava);
}

.page-about .ab-tl__rail {
  padding-left: 20px;
}

.page-about .ab-tl__year {
  font-size: 13px;
  letter-spacing: .05em;
  color: var(--fh-dim);
  transition: color .35s var(--fh-ease);
}

.page-about .ab-tl__row.is-in .ab-tl__year {
  color: var(--fh-lava);
}

.page-about .ab-tl__row--now .ab-tl__year {
  color: var(--fh-amber);
}

.page-about .ab-tl__row--now .ab-tl__body h3::after {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-left: 10px;
  border-radius: 50%;
  background: var(--fh-amber);
  vertical-align: middle;
  animation: ab-pulse 4s ease-in-out infinite;
}

@keyframes ab-pulse {
  0%, 70%, 100% { opacity: .35; transform: scale(.85); }
  85% { opacity: 1; transform: scale(1.15); }
}

.page-about .ab-tl__body p {
  margin: 10px 0 0;
  max-width: 62ch;
  color: var(--fh-mist);
  font-size: .96rem;
  line-height: 1.8;
}

/* ---------- 有机形态引言 ---------- */
.page-about .ab-quote {
  margin-block: clamp(44px, 7vw, 84px);
  padding: clamp(28px, 5.4vw, 56px) clamp(24px, 4.6vw, 62px);
  border: 1px solid rgba(255, 176, 32, .3);
  border-radius: 108px 26px 108px 26px;
  background:
    linear-gradient(132deg, rgba(255, 176, 32, .17), rgba(255, 90, 31, .09) 52%, rgba(79, 195, 247, .12));
  transform: rotate(-.7deg);
}

.page-about .ab-quote p {
  margin: 0;
  max-width: 40ch;
  font-family: var(--fh-serif);
  font-weight: 700;
  font-size: clamp(1.12rem, 3.2vw, 1.62rem);
  line-height: 1.58;
  color: var(--fh-bone);
}

/* ---------- 团队 ---------- */
.page-about .ab-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 40px);
}

.page-about .ab-roles {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .ab-roles li {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 12px;
  padding-top: 16px;
  border-top: 1px solid var(--fh-line);
}

.page-about .ab-roles__n {
  font-size: 13px;
  color: var(--fh-ice);
  padding-top: 3px;
}

.page-about .ab-roles strong {
  display: block;
  font-family: var(--fh-sans);
  font-weight: 900;
  font-size: 1rem;
  letter-spacing: .01em;
}

.page-about .ab-roles p {
  margin: 6px 0 0;
  color: var(--fh-mist);
  font-size: .93rem;
  line-height: 1.78;
}

.page-about .ab-team__body .fh-h2 {
  max-width: 18ch;
}

.page-about .ab-team__body > p {
  margin-top: 14px;
  color: var(--fh-mist);
  line-height: 1.8;
}

/* ---------- 四步流程 ---------- */
.page-about .ab-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .ab-step {
  border: 1px solid var(--fh-line);
  border-radius: var(--fh-radius-sm);
  background: var(--fh-ink-2);
  overflow: hidden;
  transition: border-color .25s var(--fh-ease), background .25s var(--fh-ease);
}

.page-about .ab-step[open] {
  border-color: rgba(255, 90, 31, .42);
  background: linear-gradient(180deg, rgba(255, 90, 31, .08), transparent 68%), var(--fh-ink-2);
}

.page-about .ab-step__sum {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 20px;
  cursor: pointer;
  list-style: none;
  font-family: var(--fh-sans);
  font-weight: 900;
  font-size: 1rem;
  letter-spacing: .01em;
}

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

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

.page-about .ab-step__n {
  font-size: 12.5px;
  color: var(--fh-lava);
}

.page-about .ab-step__t {
  flex: 1;
}

.page-about .ab-step__mark {
  position: relative;
  width: 14px;
  height: 14px;
  flex: none;
}

.page-about .ab-step__mark::before,
.page-about .ab-step__mark::after {
  content: "";
  position: absolute;
  background: var(--fh-mist);
  transition: transform .25s var(--fh-ease), background .25s var(--fh-ease);
}

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

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

.page-about .ab-step[open] .ab-step__mark::after {
  transform: scaleY(0);
}

.page-about .ab-step[open] .ab-step__mark::before {
  background: var(--fh-lava);
}

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

.page-about .ab-step__body p {
  margin: 0;
  max-width: 64ch;
  color: var(--fh-mist);
  font-size: .94rem;
  line-height: 1.82;
}

/* ---------- 荣誉 ---------- */
.page-about .ab-honor {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .ab-honor__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 20px 22px;
  border-left: 2px solid var(--fh-gold);
  background: linear-gradient(90deg, rgba(201, 162, 39, .1), transparent 74%);
  transition: border-color .25s var(--fh-ease), transform .25s var(--fh-ease), background .25s var(--fh-ease);
}

.page-about .ab-honor__item:hover,
.page-about .ab-honor__item:focus-within {
  border-left-color: var(--fh-amber);
  background: linear-gradient(90deg, rgba(255, 176, 32, .16), transparent 78%);
  transform: translateX(4px);
}

.page-about .ab-honor__y {
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--fh-amber);
}

.page-about .ab-honor__name {
  margin: 0;
  font-family: var(--fh-sans);
  font-weight: 900;
  font-size: 1.02rem;
  letter-spacing: .01em;
}

.page-about .ab-honor__c p {
  margin: 8px 0 0;
  max-width: 66ch;
  color: var(--fh-mist);
  font-size: .92rem;
  line-height: 1.78;
}

/* ---------- 合作场景 ---------- */
.page-about .ab-scenes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .ab-scene {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 24px 22px 22px;
  border: 1px solid var(--fh-line);
  border-radius: var(--fh-radius-sm);
  background: var(--fh-ink-2);
  transition: border-color .25s var(--fh-ease), transform .3s var(--fh-ease);
}

.page-about .ab-scene::before {
  content: "";
  position: absolute;
  left: 22px;
  right: 22px;
  top: 0;
  height: 3px;
  border-radius: 0 0 3px 3px;
  background: var(--fh-lava);
}

.page-about .ab-scene--ice::before { background: var(--fh-ice); }
.page-about .ab-scene--amber::before { background: var(--fh-amber); }
.page-about .ab-scene--gold::before { background: var(--fh-gold); }

.page-about .ab-scene:hover {
  border-color: rgba(242, 240, 236, .3);
  transform: translateY(-3px);
}

.page-about .ab-scene__n {
  font-size: 12px;
  color: var(--fh-dim);
  letter-spacing: .08em;
}

.page-about .ab-scene .fh-h3 {
  margin: 10px 0 0;
  font-size: 1.05rem;
}

.page-about .ab-scene p {
  margin: 12px 0 18px;
  flex: 1;
  color: var(--fh-mist);
  font-size: .92rem;
  line-height: 1.78;
}

.page-about .ab-scene__link {
  align-self: flex-start;
  font-size: 13px;
  font-weight: 700;
  color: var(--fh-lava);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 90, 31, .45);
  padding-bottom: 2px;
  transition: color .2s var(--fh-ease), border-color .2s var(--fh-ease);
}

.page-about .ab-scene__link:hover {
  color: var(--fh-amber);
  border-color: var(--fh-amber);
}

/* ---------- 收尾 ---------- */
.page-about .ab-cta {
  position: relative;
  margin-top: clamp(48px, 7vw, 90px);
  padding-block: clamp(44px, 6vw, 72px);
  border-top: 1px solid var(--fh-line);
  background:
    linear-gradient(118deg, rgba(255, 90, 31, .14), transparent 56%),
    linear-gradient(280deg, rgba(79, 195, 247, .1), transparent 52%),
    var(--fh-ink-2);
}

.page-about .ab-cta__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  align-items: center;
}

.page-about .ab-cta__inner .fh-h2 {
  max-width: 20ch;
}

.page-about .ab-cta__inner .fh-lede {
  margin-top: 14px;
  color: var(--fh-mist);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-stats__item {
    border-bottom: 0;
    border-right: 1px solid var(--fh-line);
  }

  .page-about .ab-stats__item:nth-child(2n) {
    border-right: 1px solid var(--fh-line);
  }

  .page-about .ab-stats__item:nth-child(4n) {
    border-right: 0;
  }

  .page-about .ab-honor__item {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 18px;
    align-items: start;
  }

  .page-about .ab-honor__c p {
    margin-top: 6px;
  }
}

@media (min-width: 760px) {
  .page-about {
    --ab-rail: 96px;
  }

  .page-about .ab-tl__row {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: 28px;
    padding-block: 28px;
  }

  .page-about .ab-tl__rail {
    padding-left: 26px;
  }

  .page-about .ab-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .ab-scenes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .ab-cta__inner {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    gap: 40px;
  }

  .page-about .ab-cta__acts {
    justify-content: flex-end;
  }
}

@media (min-width: 980px) {
  .page-about .ab-team {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .ab-team__media {
    position: sticky;
    top: 96px;
  }

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

  .page-about .ab-origin__body {
    grid-template-columns: minmax(0, 1fr);
    padding-left: 8%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-tl__row--now .ab-tl__body h3::after {
    animation: none;
    opacity: 1;
  }

  .page-about .ab-scene,
  .page-about .ab-honor__item,
  .page-about .ab-tl__year {
    transition: none;
  }
}