/* ===== 关于博亚页面专属样式 ===== */
.page-about {
  --about-gold-line: rgba(212, 175, 55, 0.14);
  --about-gold-soft: rgba(212, 175, 55, 0.06);
  --about-gold-strong: rgba(212, 175, 55, 0.42);
  --about-blue-soft: rgba(0, 229, 255, 0.07);
  --about-blue-line: rgba(0, 229, 255, 0.38);
  --about-radius: 6px;
}

/* ···· 面包屑 ···· */
.page-about .about-crumb {
  padding-top: 26px;
}

/* ···· 品牌理念 ···· */
.page-about .brand-arena {
  position: relative;
  padding-top: 12px;
  padding-bottom: 64px;
}

.page-about .brand-arena::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--about-gold-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-gold-soft) 1px, transparent 1px);
  background-size: 80px 80px;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(to bottom, black, transparent 96%);
  mask-image: linear-gradient(to bottom, black, transparent 96%);
}

.page-about .brand-arena .container {
  position: relative;
  z-index: 1;
}

.page-about .brand-arena__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  align-items: start;
}

.page-about .brand-arena__media {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--gold-line);
  border-radius: var(--about-radius);
  background: var(--bg-card);
}

.page-about .brand-arena__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .brand-arena__body {
  padding-top: 4px;
}

.page-about .brand-arena__body > p {
  margin: 0 0 14px;
  line-height: 1.75;
  color: var(--text);
}

.page-about .brand-arena__body .lead {
  font-size: 18px;
  line-height: 1.7;
  color: var(--text);
}

.page-about .brand-arena__subtitle {
  margin: 34px 0 0;
  padding-left: 14px;
  font-family: var(--font-head);
  font-size: 22px;
  font-style: italic;
  letter-spacing: 0.02em;
  border-left: 3px solid var(--gold);
  color: var(--text);
}

.page-about .brand-principles {
  margin: 18px 0 28px;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--gold-line);
}

.page-about .brand-principles__item {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--gold-line);
}

.page-about .brand-principles__index {
  font-family: var(--font-head);
  font-size: 16px;
  font-style: italic;
  color: var(--gold);
  letter-spacing: 0.06em;
}

.page-about .brand-principles__body h4 {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
}

.page-about .brand-principles__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--muted);
}

.page-about .brand-arena__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 6px;
}

/* ···· 发展里程碑 ···· */
.page-about .timeline-arena {
  padding-top: 20px;
  padding-bottom: 60px;
}

.page-about .timeline-track {
  position: relative;
  margin-top: 4px;
}

.page-about .timeline-track__bg {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 1;
  object-fit: cover;
  border: 1px solid var(--gold-line);
  border-radius: var(--about-radius);
}

.page-about .timeline-track__items {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  margin-top: 26px;
}

.page-about .milestone {
  position: relative;
  padding-left: 24px;
  padding-bottom: 28px;
}

.page-about .milestone::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 12px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, var(--gold), rgba(212, 175, 55, 0.12), transparent);
}

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

.page-about .milestone:last-child::before {
  bottom: auto;
  height: 24px;
}

.page-about .milestone__trigger {
  position: relative;
  display: block;
  width: 100%;
  border: 0;
  background: none;
  padding: 0;
  margin: 0;
  text-align: left;
  cursor: pointer;
  color: var(--text);
  font: inherit;
}

.page-about .milestone__node {
  position: absolute;
  left: -5px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 10px rgba(255, 215, 0, 0.55), 0 0 0 3px rgba(212, 175, 55, 0.15);
}

.page-about .milestone__period {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 6px;
}

.page-about .milestone__title {
  display: block;
  font-family: var(--font-head);
  font-size: 20px;
  font-style: italic;
  letter-spacing: 0.02em;
  color: var(--text);
  line-height: 1.25;
  transition: color var(--transition);
}

.page-about .milestone__trigger:hover .milestone__title {
  color: var(--gold-bright);
}

.page-about .milestone__signal {
  position: absolute;
  right: 0;
  top: 2px;
  font-size: 18px;
  font-weight: 300;
  color: var(--muted);
  transition: transform var(--transition);
}

.page-about .milestone.is-open .milestone__signal,
.page-about .milestone[data-open] .milestone__signal {
  transform: rotate(45deg);
}

.page-about .milestone__detail {
  margin-top: 12px;
}

.page-about .milestone__detail p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .timeline-arena__link {
  margin-top: 32px;
  text-align: center;
}

/* ···· 资质与认证 ···· */
.page-about .cert-arena {
  padding-top: 20px;
  padding-bottom: 64px;
}

.page-about .cert-arena__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: center;
  margin-top: 8px;
}

.page-about .cert-arena__cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .cert-card {
  perspective: 1200px;
  height: 200px;
  cursor: pointer;
  outline: none;
}

.page-about .cert-card__inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.36s ease;
}

.page-about .cert-card:hover .cert-card__inner,
.page-about .cert-card:focus-visible .cert-card__inner {
  transform: rotateY(180deg);
}

.page-about .cert-card__front,
.page-about .cert-card__back {
  position: absolute;
  inset: 0;
  border-radius: var(--about-radius);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  padding: 26px;
  border: 1px solid var(--gold-line);
}

.page-about .cert-card__front {
  background: linear-gradient(145deg, rgba(26, 26, 36, 0.85), rgba(18, 18, 26, 0.7));
}

.page-about .cert-card__back {
  transform: rotateY(180deg);
  background: linear-gradient(145deg, rgba(212, 175, 55, 0.16), rgba(18, 18, 26, 0.94));
  border-color: rgba(212, 175, 55, 0.6);
  align-items: flex-start;
}

.page-about .cert-card__icon {
  width: 44px;
  height: 48px;
  margin-bottom: 16px;
  color: var(--gold);
}

.page-about .cert-card__type {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 8px;
}

.page-about .cert-card__name {
  margin: 0;
  font-family: var(--font-head);
  font-size: 24px;
  font-style: italic;
  color: var(--text);
  line-height: 1.15;
}

.page-about .cert-card__back p {
  margin: 0 0 10px;
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
}

.page-about .cert-card__tag {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--gold);
  border: 1px solid var(--gold-line);
  padding: 4px 10px;
  border-radius: 999px;
}

.page-about .cert-arena__media {
  margin: 0;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--gold-line);
  border-radius: var(--about-radius);
  background: var(--bg-card);
}

.page-about .cert-arena__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ···· 合作生态 ···· */
.page-about .partner-arena {
  padding-top: 20px;
  padding-bottom: 64px;
}

.page-about .partner-arena__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
  align-items: center;
  margin-top: 8px;
}

.page-about .partner-network {
  margin: 0;
  border: 1px solid var(--gold-line);
  border-radius: var(--about-radius);
  overflow: hidden;
  background: linear-gradient(150deg, rgba(18, 18, 26, 0.6), rgba(10, 10, 15, 0.9));
}

.page-about .partner-network svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .media-frame__caption {
  padding: 10px 16px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
  border-top: 1px solid var(--gold-line);
  background: rgba(18, 18, 26, 0.6);
}

.page-about .partner-arena__body h3 {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-size: 24px;
  font-style: italic;
  color: var(--text);
}

.page-about .partner-arena__body p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .partner-arena__body a {
  color: var(--blue);
}

.page-about .partner-meta {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  border-top: 1px solid var(--gold-line);
}

.page-about .partner-meta li {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 13px 0;
  border-bottom: 1px solid var(--gold-line);
}

.page-about .partner-meta__label {
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.page-about .partner-meta__value {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  text-align: right;
}

/* ···· 团队与联系 ···· */
.page-about .team-arena {
  padding-top: 20px;
  padding-bottom: 72px;
}

.page-about .team-arena__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  margin-top: 8px;
  align-items: start;
}

.page-about .team-arena__stat {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 32px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--gold-line);
}

.page-about .team-arena__number {
  font-family: var(--font-head);
  font-style: italic;
  font-size: 56px;
  line-height: 1;
  color: var(--gold);
}

.page-about .team-arena__unit {
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
}

.page-about .team-arena__label {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .team-function {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .team-function__item {
  position: relative;
  padding: 22px;
  border: 1px solid var(--gold-line);
  border-radius: var(--about-radius);
  background: linear-gradient(150deg, rgba(26, 26, 36, 0.5), rgba(18, 18, 26, 0.85));
}

.page-about .team-function__index {
  display: block;
  font-family: var(--font-head);
  font-style: italic;
  font-size: 14px;
  letter-spacing: 0.12em;
  color: var(--gold);
  margin-bottom: 10px;
}

.page-about .team-function__item h3 {
  margin: 0 0 10px;
  font-size: 17px;
  color: var(--text);
}

.page-about .team-function__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.68;
  color: var(--muted);
}

.page-about .team-arena__contact {
  border: 1px solid var(--gold-line);
  border-radius: var(--about-radius);
  padding: 26px;
  background: linear-gradient(160deg, rgba(212, 175, 55, 0.07), rgba(18, 18, 26, 0.9));
}

.page-about .team-arena__contact h3 {
  margin: 0 0 18px;
  font-family: var(--font-head);
  font-size: 22px;
  font-style: italic;
  color: var(--text);
}

.page-about .team-arena__note {
  margin-top: 16px;
  font-size: 13px;
  line-height: 1.6;
}

.page-about .team-arena__contact .btn-prime {
  margin-top: 20px;
}

.page-about .team-arena__trust {
  margin: 48px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--gold-line);
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
  text-align: center;
}

/* ···· 响应式 ···· */
@media (min-width: 760px) {
  .page-about .cert-arena__cards {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .cert-arena__layout {
    grid-template-columns: minmax(0, 1fr) minmax(280px, 420px);
    gap: 48px;
  }
}

@media (min-width: 860px) {
  .page-about .brand-arena__grid {
    grid-template-columns: minmax(320px, 400px) 1fr;
    gap: 52px;
  }

  .page-about .brand-principles__item {
    grid-template-columns: 60px 1fr;
    padding: 22px 0;
  }
}

@media (min-width: 960px) {
  .page-about .partner-arena__layout {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: 64px;
  }

  .page-about .team-arena__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(300px, 0.85fr);
    gap: 56px;
  }

  .page-about .team-function {
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
  }

  .page-about .cert-card {
    height: 240px;
  }
}

@media (min-width: 1024px) {
  .page-about .timeline-track__items {
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 0 20px;
    margin-top: 22px;
  }

  .page-about .milestone {
    padding-left: 0;
    padding-bottom: 0;
    border-left: 0;
    padding-top: 24px;
    border-top: 1px solid var(--gold);
  }

  .page-about .milestone::before {
    display: none;
  }

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

  .page-about .milestone__trigger {
    min-height: 132px;
  }

  .page-about .milestone__node {
    left: 0;
    top: -6px;
  }

  .page-about .milestone__signal {
    display: none;
  }

  .page-about .milestone__detail {
    max-width: none;
  }
}