.page-about {
  background-color: var(--deep-sea);
  color: rgba(255, 255, 255, 0.85);
  overflow-x: hidden;
}

/* 面包屑 */
.page-about .breadcrumb {
  padding: 16px 0 0;
  font-size: 14px;
}
.page-about .breadcrumb a {
  color: rgba(255, 255, 255, 0.55);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}
.page-about .breadcrumb a:hover {
  color: var(--coral);
}
.page-about .breadcrumb__sep {
  margin: 0 8px;
  color: rgba(255, 255, 255, 0.35);
}
.page-about .breadcrumb__current {
  color: rgba(255, 255, 255, 0.75);
}

/* 页头 */
.page-about .page-header {
  padding: 36px 0 56px;
}
.page-about .page-header .exhibit-label {
  margin-bottom: 16px;
}
.page-about .page-header__title {
  font-size: 2rem;
  line-height: 1.2;
  color: var(--white);
  max-width: 720px;
  font-weight: 900;
  margin: 0 0 16px;
}
.page-about .page-header__desc {
  color: rgba(255, 255, 255, 0.6);
  max-width: 520px;
  font-size: 1.05rem;
  line-height: 1.7;
  margin: 0;
}

/* 品牌使命 */
.page-about .brand-mission {
  padding-top: 0;
}
.page-about .brand-mission__inner {
  display: grid;
  gap: 40px;
  align-items: center;
}
.page-about .brand-mission__copy h2 {
  font-size: 1.75rem;
  line-height: 1.2;
  color: var(--white);
  margin: 12px 0 16px;
}
.page-about .brand-mission__copy > p {
  color: rgba(255, 255, 255, 0.68);
  line-height: 1.7;
  margin-bottom: 16px;
}
.page-about .brand-mission__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 28px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
}
.page-about .brand-mission__stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.page-about .brand-mission__stat-num {
  font-size: 1.75rem;
  font-weight: 900;
  line-height: 1.1;
  color: var(--white);
}
.page-about .brand-mission__stat-label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.5);
}
.page-about .brand-mission__media {
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
  line-height: 0;
}
.page-about .brand-mission__media::after {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius);
  pointer-events: none;
}
.page-about .brand-mission__media img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* 发展里程碑 */
.page-about .milestones {
  background: linear-gradient(180deg, var(--deep-sea) 0%, #062033 100%);
}
.page-about .milestones__layout {
  display: grid;
  gap: 48px;
}
.page-about .milestones__aside h2 {
  font-size: 1.75rem;
  line-height: 1.2;
  color: var(--white);
  margin: 12px 0 8px;
}
.page-about .milestones__intro {
  color: rgba(255, 255, 255, 0.65);
  line-height: 1.6;
  margin: 0;
}
.page-about .milestones__aside img {
  width: 100%;
  height: auto;
  object-fit: cover;
  display: block;
  border-radius: var(--radius);
  margin-top: 24px;
}
.page-about .milestones__aside-note {
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.92rem;
  line-height: 1.65;
  margin: 14px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--coral);
}

/* 时间线 */
.page-about .milestones__timeline {
  position: relative;
}
.page-about .milestones__timeline::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--bright-blue) 0%, var(--coral) 100%);
  opacity: 0.45;
}
.page-about .timeline-item {
  position: relative;
  padding-left: 48px;
  margin-bottom: 28px;
}
.page-about .timeline-item:last-child {
  margin-bottom: 0;
}
.page-about .timeline-item__dot {
  position: absolute;
  left: 8px;
  top: 8px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bright-blue);
  border: 3px solid #062033;
  box-sizing: border-box;
}
.page-about .timeline-item--latest .timeline-item__dot {
  background: var(--coral);
  box-shadow: 0 0 12px rgba(255, 111, 97, 0.55);
}
.page-about .timeline-item__card {
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: var(--radius);
  padding: 20px;
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.page-about .timeline-item__card:hover {
  border-color: rgba(255, 111, 97, 0.45);
  background: rgba(255, 255, 255, 0.07);
  transform: translateX(4px);
}
.page-about .timeline-item__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  margin-bottom: 8px;
}
.page-about .timeline-item__year {
  font-size: 1.4rem;
  font-weight: 900;
  line-height: 1;
  color: var(--white);
  letter-spacing: 0.02em;
}
.page-about .timeline-item--latest .timeline-item__year {
  color: var(--coral);
}
.page-about .timeline-item__card h3 {
  font-size: 1.05rem;
  line-height: 1.3;
  color: var(--white);
  margin: 0 0 8px;
}
.page-about .timeline-item__card p {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.92rem;
  line-height: 1.65;
  margin: 0;
}

/* 资质与荣誉 */
.page-about .honors {
  background: #082B47;
}
.page-about .honors__heading {
  display: grid;
  gap: 16px;
  align-items: end;
}
.page-about .honors__heading h2 {
  font-size: 1.75rem;
  line-height: 1.2;
  color: var(--white);
  margin: 12px 0 0;
}
.page-about .honors__heading-note {
  color: rgba(255, 255, 255, 0.55);
  line-height: 1.6;
  margin: 0;
  font-size: 0.98rem;
}
.page-about .honors__grid {
  display: grid;
  gap: 20px;
  margin-top: 36px;
}
.page-about .honor-card {
  background: rgba(255, 255, 255, 0.045);
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: var(--radius);
  padding: 24px;
}
.page-about .honor-card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}
.page-about .honor-card__top svg {
  flex-shrink: 0;
}
.page-about .honor-card h3 {
  font-size: 1.05rem;
  line-height: 1.3;
  color: var(--white);
  margin: 0 0 8px;
}
.page-about .honor-card p {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.92rem;
  line-height: 1.6;
  margin: 0;
}
.page-about .honors__media {
  margin-top: 28px;
  border-radius: var(--radius);
  overflow: hidden;
}
.page-about .honors__media img {
  width: 100%;
  height: auto;
  object-fit: cover;
  display: block;
}

/* 新版官网升级说明 */
.page-about .upgrade-note {
  padding: 56px 0 72px;
}
.page-about .upgrade-note__inner {
  background: var(--mist);
  color: var(--ink);
  border-radius: 28px 0 28px 28px;
  padding: 36px 24px 44px;
  display: grid;
  gap: 32px;
}
.page-about .upgrade-note__label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--coral);
}
.page-about .upgrade-note__label::before {
  content: "";
  width: 20px;
  height: 2px;
  background: var(--coral);
}
.page-about .upgrade-note__title h2 {
  font-size: 1.5rem;
  line-height: 1.25;
  color: var(--deep-sea);
  margin: 12px 0 0;
}
.page-about .upgrade-note__body > p {
  color: rgba(51, 51, 51, 0.85);
  line-height: 1.7;
  margin: 0 0 20px;
}
.page-about .upgrade-note__list {
  list-style: none;
  padding: 0;
  margin: 0 0 28px;
  display: grid;
  gap: 14px;
}
.page-about .upgrade-note__list li {
  position: relative;
  padding-left: 22px;
  color: var(--ink);
  line-height: 1.65;
}
.page-about .upgrade-note__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--coral);
}
.page-about .upgrade-note__list strong {
  color: var(--coral);
}
.page-about .upgrade-note__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about .upgrade-note .btn--ghost {
  border-color: var(--deep-sea);
  color: var(--deep-sea);
}
.page-about .upgrade-note .btn--ghost:hover {
  background: rgba(10, 37, 64, 0.08);
}

/* 桌面端 */
@media (min-width: 900px) {
  .page-about .page-header {
    padding: 56px 0 88px;
  }
  .page-about .page-header__title {
    font-size: 2.75rem;
  }
  .page-about .brand-mission__inner {
    grid-template-columns: 7fr 5fr;
    gap: 64px;
  }
  .page-about .milestones__layout {
    grid-template-columns: 5fr 7fr;
    gap: 64px;
    align-items: start;
  }
  .page-about .milestones__aside {
    position: sticky;
    top: 96px;
  }
  .page-about .honors__heading {
    grid-template-columns: 1fr 1fr;
  }
  .page-about .honors__grid {
    grid-template-columns: repeat(3, 1fr);
    align-items: start;
  }
  .page-about .honor-card:nth-child(2) {
    margin-top: 36px;
  }
  .page-about .upgrade-note {
    padding: 72px 0 96px;
  }
  .page-about .upgrade-note__inner {
    grid-template-columns: 1fr 1.3fr;
    gap: 48px;
    border-radius: 48px 0 0 48px;
    padding: 56px 64px 56px 56px;
  }
  .page-about .upgrade-note__title h2 {
    font-size: 1.75rem;
  }
}