/* ===================== 品牌档案 / about ===================== */
.page-about {
  --ab-rail: 118px;
  --ab-line-x: 118px;
  --ab-inner: clamp(18px, 3vw, 40px);
  color: var(--cream);
}

.page-about .shell {
  position: relative;
  z-index: 1;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: calc(var(--header-h) + clamp(44px, 7vw, 92px)) 0 clamp(40px, 5.4vw, 76px);
  background:
    radial-gradient(130% 92% at 84% -12%, rgba(201, 162, 74, .17), transparent 58%),
    radial-gradient(96% 72% at 4% 112%, rgba(47, 143, 123, .13), transparent 62%),
    linear-gradient(178deg, #0C1226 0%, var(--indigo) 70%);
  border-bottom: 1px solid var(--line-soft);
  overflow: hidden;
}

.page-about .ab-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--line-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-soft) 1px, transparent 1px);
  background-size: 96px 96px;
  opacity: .55;
  -webkit-mask-image: radial-gradient(120% 92% at 72% 0%, #000 18%, transparent 74%);
  mask-image: radial-gradient(120% 92% at 72% 0%, #000 18%, transparent 74%);
  pointer-events: none;
}

.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(30px, 4.4vw, 62px);
}

.page-about .ab-hero__copy {
  max-width: 62ch;
}

.page-about .ab-hero__title {
  margin: 18px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(30px, 4.4vw, 56px);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--cream);
}

.page-about .ab-hero__accent {
  color: var(--gold-bright);
}

.page-about .ab-hero__lead {
  margin: 22px 0 0;
  max-width: 54ch;
  font-size: clamp(16px, 1.35vw, 18px);
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .ab-hero__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

/* 概况数据 */
.page-about .ab-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
  align-self: start;
}

.page-about .ab-stats__cell {
  padding: 18px 20px 20px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(28, 42, 70, .42);
}

.page-about .ab-stats__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--mauve);
  text-transform: uppercase;
}

.page-about .ab-stats__value {
  margin: 10px 0 0;
  display: flex;
  align-items: baseline;
  gap: 5px;
}

.page-about .ab-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.2vw, 34px);
  line-height: 1;
  color: var(--gold-bright);
}

.page-about .ab-stats__unit {
  font-size: 14px;
  color: var(--ink-faint);
}

/* ---------- 时间线 ---------- */
.page-about .ab-tl {
  list-style: none;
  margin: clamp(34px, 4.6vw, 58px) 0 0;
  padding: 0;
  position: relative;
}

.page-about .ab-tl::before {
  content: "";
  position: absolute;
  left: calc(var(--ab-line-x) - 1px);
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, transparent, var(--line-strong) 5%, var(--line-strong) 95%, transparent);
}

.page-about .ab-tl__item {
  display: grid;
  grid-template-columns: var(--ab-rail) minmax(0, 1fr);
  gap: var(--ab-inner);
  padding-bottom: clamp(38px, 4.8vw, 62px);
}

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

.page-about .ab-tl__rail {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 6px;
  padding-right: 24px;
  padding-top: 2px;
  text-align: right;
}

.page-about .ab-tl__rail::after {
  content: "";
  position: absolute;
  right: -5px;
  top: 6px;
  width: 11px;
  height: 11px;
  background: var(--indigo);
  border: 1px solid var(--gold);
}

.page-about .ab-tl__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--gold);
}

.page-about .ab-tl__year {
  font-family: var(--font-mono);
  font-size: 20px;
  letter-spacing: .02em;
  color: var(--cream);
}

.page-about .ab-tl__body {
  padding-top: 2px;
}

.page-about .ab-tl__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(19px, 1.9vw, 24px);
  line-height: 1.4;
  color: var(--cream);
}

.page-about .ab-tl__text {
  margin: 12px 0 0;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .ab-tl__media {
  margin-top: clamp(18px, 2.4vw, 28px);
}

/* ---------- 团队 ---------- */
.page-about .ab-team__grid {
  display: grid;
  gap: 1px;
  margin-top: clamp(30px, 4vw, 50px);
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .ab-team__card {
  padding: clamp(24px, 2.6vw, 34px);
  background: var(--indigo);
}

.page-about .ab-team__role {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--gold);
}

.page-about .ab-team__count {
  margin: 16px 0 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.page-about .ab-team__num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(38px, 4.6vw, 54px);
  line-height: 1;
  color: var(--cream);
}

.page-about .ab-team__unit {
  font-size: 15px;
  color: var(--ink-faint);
}

.page-about .ab-team__desc {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .ab-team__fit {
  margin: 18px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
  font-size: 14px;
  line-height: 1.75;
  color: var(--gold);
}

/* ---------- 服务标准 ---------- */
.page-about .ab-standard__grid {
  display: grid;
  gap: clamp(30px, 4vw, 56px);
}

.page-about .ab-flow {
  list-style: none;
  margin: clamp(28px, 3.6vw, 44px) 0 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-flow__step {
  display: grid;
  grid-template-columns: 54px minmax(0, 1fr);
  gap: 18px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-flow__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .14em;
  color: var(--gold);
  padding-top: 4px;
}

.page-about .ab-flow__name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--cream);
}

.page-about .ab-flow__body p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .ab-credential {
  margin-top: clamp(26px, 3.4vw, 40px);
  border-top: 1px solid var(--line);
}

.page-about .ab-credential .accordion-item {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-credential .accordion-trigger {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 16px 0;
  background: none;
  border: 0;
  text-align: left;
  cursor: pointer;
  color: var(--cream);
  transition: color var(--dur) var(--ease);
}

.page-about .ab-credential .accordion-trigger:hover,
.page-about .ab-credential .accordion-trigger[aria-expanded="true"] {
  color: var(--gold-bright);
}

.page-about .ab-credential__name {
  flex: 1 1 auto;
  font-size: 15px;
  line-height: 1.6;
}

.page-about .ab-credential .accordion-panel-inner {
  padding: 0 0 20px 54px;
}

.page-about .ab-credential .accordion-panel-inner p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .ab-credential .accordion-panel-inner p:last-child {
  margin-bottom: 0;
}

.page-about .ab-standard__media {
  margin: 0;
  align-self: start;
}

/* ---------- 合作生态 ---------- */
.page-about .ab-partner__list {
  margin: clamp(30px, 4vw, 48px) 0 0;
  border-top: 1px solid var(--line);
}

.page-about .ab-partner__row {
  display: grid;
  gap: 12px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-partner__type {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .ab-partner__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--gold);
}

.page-about .ab-partner__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  color: var(--cream);
}

.page-about .ab-partner__detail {
  margin: 0;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .ab-inline-link {
  color: var(--gold-bright);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .ab-inline-link:hover,
.page-about .ab-inline-link:focus-visible {
  color: var(--cream);
  border-bottom-color: var(--gold-bright);
}

/* ---------- 年度节点 ---------- */
.page-about .ab-rhythm {
  display: grid;
  gap: 1px;
  margin-top: clamp(30px, 4vw, 48px);
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .ab-rhythm__cell {
  padding: clamp(20px, 2.4vw, 28px);
  background: linear-gradient(180deg, rgba(28, 42, 70, .6), rgba(16, 26, 51, .9));
}

.page-about .ab-rhythm__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(30px, 3.4vw, 40px);
  line-height: 1;
  color: var(--gold-bright);
}

.page-about .ab-rhythm__unit {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--mauve);
}

.page-about .ab-rhythm__name {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--cream);
}

.page-about .ab-rhythm__note {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-faint);
}

.page-about .ab-honor {
  margin-top: clamp(30px, 4vw, 46px);
  padding-top: clamp(22px, 2.6vw, 30px);
  border-top: 1px solid var(--line);
}

.page-about .ab-honor__label {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--gold);
  text-transform: uppercase;
}

.page-about .ab-honor__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .ab-honor__item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  background: rgba(28, 42, 70, .4);
  border-left: 2px solid var(--jade);
}

.page-about .ab-honor__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--mauve);
}

.page-about .ab-honor__name {
  flex: 1 1 auto;
  font-size: 15px;
  line-height: 1.6;
  color: var(--cream);
}

/* ---------- 五个主题空间 ---------- */
.page-about .ab-rooms__banner {
  margin: clamp(28px, 3.6vw, 44px) 0 0;
}

.page-about .ab-room-grid {
  display: grid;
  gap: 1px;
  margin-top: clamp(20px, 2.6vw, 30px);
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .ab-room {
  display: flex;
  flex-direction: column;
  padding: clamp(22px, 2.4vw, 30px);
  background: var(--indigo);
  transition: background var(--dur) var(--ease);
}

.page-about .ab-room:hover,
.page-about .ab-room:focus-within {
  background: var(--slate);
}

.page-about .ab-room--lead {
  background: linear-gradient(180deg, rgba(201, 162, 74, .13), rgba(16, 26, 51, .96));
}

.page-about .ab-room--lead:hover {
  background: linear-gradient(180deg, rgba(201, 162, 74, .2), rgba(28, 42, 70, .96));
}

.page-about .ab-room__idx {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--gold);
}

.page-about .ab-room__name {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.4;
  color: var(--cream);
}

.page-about .ab-room__tag {
  margin: 8px 0 0;
  display: inline-block;
  padding: 2px 10px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-tag);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--gold-bright);
  align-self: flex-start;
}

.page-about .ab-room__desc {
  margin: 16px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .ab-room__fit {
  list-style: none;
  margin: auto 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-room__fit li {
  position: relative;
  padding-left: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 2;
  color: var(--ink-faint);
}

.page-about .ab-room__fit li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 5px;
  height: 1px;
  background: var(--gold);
}

/* ---------- 收尾 ---------- */
.page-about .ab-cta__box {
  padding: clamp(30px, 4.4vw, 56px);
  background:
    radial-gradient(120% 130% at 88% 0%, rgba(201, 162, 74, .16), transparent 60%),
    var(--charcoal);
  border: 1px solid var(--line);
  border-left: 3px solid var(--vermilion);
}

.page-about .ab-cta__title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.3;
  color: var(--cream);
}

.page-about .ab-cta__text {
  margin: 16px 0 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* ---------- 响应式 ---------- */
@media (max-width: 700px) {
  .page-about {
    --ab-rail: 76px;
    --ab-line-x: 76px;
  }

  .page-about .ab-tl__year {
    font-size: 16px;
  }

  .page-about .ab-tl__rail {
    padding-right: 16px;
  }

  .page-about .ab-credential .accordion-panel-inner {
    padding-left: 0;
  }

  .page-about .ab-flow__step {
    grid-template-columns: 40px minmax(0, 1fr);
    gap: 12px;
  }

  .page-about .ab-honor__item {
    flex-wrap: wrap;
    gap: 8px 12px;
  }
}

@media (min-width: 760px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .page-about .ab-partner__row {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

@media (min-width: 960px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .78fr);
    align-items: end;
  }

  .page-about .ab-standard__grid {
    grid-template-columns: minmax(0, 1.22fr) minmax(0, .78fr);
    align-items: start;
  }

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

  .page-about .ab-room-grid {
    grid-template-columns: 1.45fr 1.2fr 1fr .82fr .72fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-room,
  .page-about .ab-inline-link,
  .page-about .ab-credential .accordion-trigger {
    transition: none;
  }
}