.page-about {
  --about-line: rgba(37, 224, 198, 0.32);
  --about-line-soft: rgba(214, 227, 242, 0.14);
  --about-surface: rgba(233, 242, 251, 0.05);
  --about-surface-2: rgba(11, 42, 74, 0.72);
  --about-radius: 22px;
  --about-text-soft: rgba(238, 244, 251, 0.72);
  background: var(--abyss);
  color: var(--mist);
  overflow-x: clip;
}

/* --- 面包屑 --- */
.page-about .about-crumb {
  padding: 26px 0 0;
}
.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
}
.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: rgba(238, 244, 251, 0.3);
}
.page-about .breadcrumb__link {
  color: var(--aqua-glow);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}
.page-about .breadcrumb__link:hover {
  color: var(--gold-mark);
}
.page-about .breadcrumb__current {
  color: rgba(238, 244, 251, 0.58);
}

/* --- 首屏 --- */
.page-about .about-hero {
  position: relative;
  padding: 22px 0 56px;
  isolation: isolate;
}
.page-about .about-hero__glow {
  position: absolute;
  top: -160px;
  left: -140px;
  right: -140px;
  height: 540px;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(circle at 26% 42%, rgba(37, 224, 198, 0.2), transparent 62%),
    radial-gradient(circle at 74% 20%, rgba(255, 106, 24, 0.17), transparent 60%);
  animation: about-breathe 8s var(--ease) infinite alternate;
}
@keyframes about-breathe {
  from { transform: translate3d(0, 0, 0) scale(1); }
  to { transform: translate3d(0, 12px, 0) scale(1.035); }
}
.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: 30px;
}
.page-about .about-hero__frame {
  position: relative;
  padding: 36px 22px 32px;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-xl);
  background: linear-gradient(155deg, rgba(11, 42, 74, 0.94) 0%, rgba(5, 18, 31, 0.88) 70%);
  box-shadow: var(--shadow-card);
}
.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  top: 14px;
  left: 16px;
  right: 16px;
  height: 8px;
  pointer-events: none;
  background-image: repeating-linear-gradient(90deg, rgba(37, 224, 198, 0.6) 0 2px, transparent 2px 16px);
  -webkit-mask-image: linear-gradient(90deg, #000 0%, rgba(0, 0, 0, 0.15) 100%);
  mask-image: linear-gradient(90deg, #000 0%, rgba(0, 0, 0, 0.15) 100%);
}
.page-about .about-hero__title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 7.4vw, 4rem);
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--paper);
  transform: skewX(-3deg);
  transform-origin: left center;
}
.page-about .about-hero__lede {
  margin: 20px 0 0;
  max-width: 48ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--about-text-soft);
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}
.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-stat {
  padding: 18px 16px;
  border: 1px dashed rgba(255, 194, 75, 0.35);
  border-radius: var(--about-radius);
  background: var(--about-surface);
}
.page-about .about-stat__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.45rem, 5.6vw, 2rem);
  line-height: 1.12;
  color: var(--gold-mark);
}
.page-about .about-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: rgba(238, 244, 251, 0.6);
}

/* --- 通用分区 --- */
.page-about .about-section {
  position: relative;
  padding: 56px 0;
  border-top: 1px solid var(--about-line-soft);
}
.page-about .about-section .section__head {
  max-width: 62ch;
}
.page-about .about-section .section__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 5.2vw, 2.4rem);
  line-height: 1.24;
  color: var(--paper);
}
.page-about .about-section .section__desc {
  margin: 14px 0 0;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--about-text-soft);
}

/* --- 起点 --- */
.page-about .about-entry {
  display: grid;
  gap: 14px;
  margin-top: 32px;
}
.page-about .about-entry__item {
  position: relative;
  padding: 24px 20px;
  border: 1px solid var(--about-line-soft);
  border-radius: var(--about-radius);
  background: linear-gradient(180deg, rgba(233, 242, 251, 0.06), rgba(233, 242, 251, 0.015));
  transition: transform 0.24s var(--ease), border-color 0.24s var(--ease);
}
.page-about .about-entry__item:hover {
  transform: translateY(-2px);
  border-color: var(--about-line);
}
.page-about .about-entry__num {
  display: inline-block;
  padding: 3px 10px;
  border-radius: var(--pill);
  background: rgba(37, 224, 198, 0.12);
  color: var(--aqua-glow);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
}
.page-about .about-entry__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.15rem;
  color: var(--paper);
}
.page-about .about-entry__text {
  margin: 10px 0 0;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--about-text-soft);
}
.page-about .about-origin__note {
  margin: 26px 0 0;
  padding: 16px 18px;
  border-left: 3px solid var(--pulse-orange);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: rgba(255, 106, 24, 0.08);
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--mist);
}

/* --- 团队 --- */
.page-about .about-team {
  background: linear-gradient(180deg, rgba(11, 42, 74, 0.55) 0%, rgba(5, 18, 31, 0) 100%);
}
.page-about .about-team__grid {
  display: grid;
  gap: 34px;
  align-items: start;
}
.page-about .about-roles {
  display: grid;
  gap: 10px;
  margin-top: 30px;
}
.page-about .about-role {
  border: 1px solid var(--about-line-soft);
  border-radius: var(--about-radius);
  background: var(--about-surface);
  overflow: hidden;
  transition: border-color 0.24s var(--ease);
}
.page-about .about-role:hover,
.page-about .about-role[open] {
  border-color: var(--about-line);
}
.page-about .about-role__head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}
.page-about .about-role__head::-webkit-details-marker {
  display: none;
}
.page-about .about-role__tag {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--gold-mark);
}
.page-about .about-role__name {
  flex: 1 1 auto;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.02rem;
  color: var(--paper);
}
.page-about .about-role__plus {
  position: relative;
  width: 14px;
  height: 14px;
  flex: 0 0 auto;
}
.page-about .about-role__plus::before,
.page-about .about-role__plus::after {
  content: "";
  position: absolute;
  background: var(--aqua-glow);
  transition: transform 0.24s var(--ease);
}
.page-about .about-role__plus::before {
  top: 6px;
  left: 0;
  width: 14px;
  height: 2px;
}
.page-about .about-role__plus::after {
  left: 6px;
  top: 0;
  width: 2px;
  height: 14px;
}
.page-about .about-role[open] .about-role__plus::after {
  transform: scaleY(0);
}
.page-about .about-role__body {
  margin: 0;
  padding: 0 18px 18px;
  font-size: 0.94rem;
  line-height: 1.78;
  color: var(--about-text-soft);
}
.page-about .about-team__media {
  border-radius: var(--radius-lg);
  overflow: hidden;
}

/* --- 时间轴 --- */
.page-about .about-timeline {
  background: linear-gradient(180deg, rgba(5, 18, 31, 0) 0%, rgba(11, 42, 74, 0.5) 45%, rgba(5, 18, 31, 0) 100%);
}
.page-about .about-timeline__layout {
  display: grid;
  gap: 36px;
  align-items: start;
}
.page-about .about-axis {
  position: relative;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-axis::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 10px;
  left: 5px;
  width: 1px;
  background: linear-gradient(180deg, var(--aqua-glow), rgba(37, 224, 198, 0.15) 92%, transparent);
}
.page-about .about-axis__node {
  position: relative;
  padding: 0 0 34px 30px;
}
.page-about .about-axis__node:last-child {
  padding-bottom: 0;
}
.page-about .about-axis__node::before {
  content: "";
  position: absolute;
  top: 4px;
  left: 0;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--aqua-glow);
  box-shadow: 0 0 0 4px rgba(37, 224, 198, 0.14);
}
.page-about .about-axis__year {
  display: inline-block;
  padding: 3px 12px;
  border: 1px solid var(--about-line);
  border-radius: var(--pill);
  background: rgba(37, 224, 198, 0.1);
  color: var(--aqua-glow);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
}
.page-about .about-axis__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.12rem;
  color: var(--paper);
}
.page-about .about-axis__content p {
  margin: 8px 0 0;
  font-size: 0.94rem;
  line-height: 1.78;
  color: var(--about-text-soft);
}
.page-about .about-timeline__media {
  border-radius: var(--radius-lg);
  overflow: hidden;
}

/* --- 合作生态（浅色分区） --- */
.page-about .about-eco {
  border-top: none;
  background: linear-gradient(180deg, var(--mist) 0%, #e2edf9 100%);
  color: var(--graphite);
}
.page-about .about-eco .eyebrow {
  color: var(--harbor-blue);
}
.page-about .about-eco .section__title {
  color: var(--graphite);
}
.page-about .about-eco .section__desc {
  color: var(--slate);
}
.page-about .about-eco__grid {
  display: grid;
  gap: 14px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-eco__item {
  padding: 22px 20px;
  border: 1px solid var(--line-mist);
  border-radius: var(--about-radius);
  background: var(--paper);
  transition: transform 0.24s var(--ease), border-color 0.24s var(--ease), box-shadow 0.24s var(--ease);
}
.page-about .about-eco__item:hover {
  transform: translateY(-2px);
  border-color: var(--signal-blue);
  box-shadow: 0 20px 44px -30px rgba(11, 42, 74, 0.75);
}
.page-about .about-eco .tag {
  background: rgba(20, 80, 127, 0.09);
  border-color: rgba(20, 80, 127, 0.2);
  color: var(--harbor-blue);
}
.page-about .about-eco__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.08rem;
  color: var(--graphite);
}
.page-about .about-eco__item p {
  margin: 10px 0 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--slate);
}

/* --- 北京本地 --- */
.page-about .about-beijing__grid {
  display: grid;
  gap: 34px;
  align-items: center;
}
.page-about .about-beijing__media {
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.page-about .about-beijing__list {
  display: grid;
  gap: 16px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-beijing__item {
  display: flex;
  gap: 14px;
  padding: 16px 18px;
  border: 1px solid var(--about-line-soft);
  border-radius: var(--radius-md);
  background: var(--about-surface-2);
}
.page-about .about-beijing__num {
  flex: 0 0 auto;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--pulse-orange);
  padding-top: 3px;
}
.page-about .about-beijing__item h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--paper);
}
.page-about .about-beijing__item p {
  margin: 8px 0 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--about-text-soft);
}

/* --- 资质徽标 --- */
.page-about .about-badges {
  display: grid;
  gap: 14px;
  margin: 32px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-badge {
  position: relative;
  padding: 22px 20px;
  border: 1px dashed rgba(255, 194, 75, 0.42);
  border-radius: var(--about-radius);
  background: linear-gradient(170deg, rgba(255, 194, 75, 0.08) 0%, rgba(5, 18, 31, 0) 72%);
  transition: transform 0.24s var(--ease), border-color 0.24s var(--ease);
}
.page-about .about-badge:hover {
  transform: translateY(-2px);
  border-color: var(--gold-mark);
}
.page-about .about-badge__num {
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--gold-mark);
}
.page-about .about-badge__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.06rem;
  color: var(--paper);
}
.page-about .about-badge p {
  margin: 10px 0 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--about-text-soft);
}

/* --- 下一步 --- */
.page-about .about-next {
  border-top: 1px solid var(--about-line-soft);
}
.page-about .about-next__grid {
  display: grid;
  gap: 14px;
  margin-top: 32px;
}
.page-about .about-next__card {
  position: relative;
  display: block;
  padding: 24px 20px 26px;
  border: 1px solid var(--about-line-soft);
  border-radius: var(--about-radius);
  background: linear-gradient(180deg, rgba(20, 80, 127, 0.28) 0%, rgba(5, 18, 31, 0.4) 100%);
  text-decoration: none;
  transition: transform 0.24s var(--ease), border-color 0.24s var(--ease);
}
.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  transform: translateY(-3px);
  border-color: var(--aqua-glow);
}
.page-about .about-next__label {
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  color: var(--aqua-glow);
}
.page-about .about-next__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.2rem;
  color: var(--paper);
}
.page-about .about-next__card p {
  margin: 10px 0 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--about-text-soft);
}
.page-about .about-next__arrow {
  display: inline-block;
  margin-top: 16px;
  color: var(--pulse-orange);
  font-size: 1.1rem;
  transition: transform 0.24s var(--ease);
}
.page-about .about-next__card:hover .about-next__arrow {
  transform: translateX(4px);
}
.page-about .about-path {
  display: block;
  margin-top: 34px;
  text-decoration: none;
  transition: transform 0.24s var(--ease);
}
.page-about .about-path:hover,
.page-about .about-path:focus-visible {
  transform: translateX(6px);
}
.page-about .about-path .path-strip__title {
  color: var(--paper);
}

/* --- 响应式 --- */
@media (min-width: 620px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-eco__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-badges {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-hero__frame {
    padding: 44px 40px 40px;
  }
  .page-about .about-hero__frame::after {
    left: 28px;
    right: 28px;
  }
}

@media (min-width: 900px) {
  .page-about .about-section {
    padding: 88px 0;
  }
  .page-about .about-hero {
    padding: 36px 0 78px;
  }
  .page-about .about-hero__inner {
    gap: 36px;
  }
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-entry {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 52px;
  }
  .page-about .about-timeline__layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 400px);
    gap: 56px;
  }
  .page-about .about-timeline__media {
    position: sticky;
    top: 40px;
  }
  .page-about .about-beijing__grid {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    gap: 52px;
  }
  .page-about .about-next__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 1040px) {
  .page-about .about-eco__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-badges {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__glow,
  .page-about .about-entry__item,
  .page-about .about-eco__item,
  .page-about .about-badge,
  .page-about .about-next__card,
  .page-about .about-next__arrow,
  .page-about .about-path,
  .page-about .about-role__plus::before,
  .page-about .about-role__plus::after {
    animation: none !important;
    transition: none !important;
  }
}