.page-about {
  position: relative;
  isolation: isolate;
}

.page-about > section,
.page-about > nav {
  position: relative;
  z-index: 1;
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, rgba(42, 51, 84, 0.32) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 51, 84, 0.32) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: 0.5;
}

/* ============ 首屏 ============ */

.page-about .about-hero {
  padding: 104px 0 56px;
  position: relative;
}

@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 140px 0 80px;
  }
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 6%, var(--violet) 30%, var(--cyan) 62%, transparent 94%);
  opacity: 0.5;
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: 28px;
}

.page-about .about-hero-title {
  margin: 14px 0 0;
  max-width: 20em;
  font-size: clamp(30px, 7.4vw, 62px);
  line-height: 1.16;
  letter-spacing: 0.01em;
}

.page-about .about-lead {
  margin: 26px 0 0;
  max-width: 46em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--white);
  opacity: 0.88;
}

@media (min-width: 768px) {
  .page-about .about-lead {
    font-size: 17px;
  }
}

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

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 48px;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-stat {
  padding: 16px 14px 20px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(18, 20, 31, 0.82), rgba(10, 14, 31, 0.55));
  min-width: 0;
}

.page-about .about-stat-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  margin-bottom: 14px;
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(22px, 4.4vw, 30px);
  line-height: 1.12;
  color: var(--white);
  letter-spacing: 0.01em;
}

/* ============ 右侧固定索引 ============ */

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

@media (min-width: 1500px) {
  .page-about .about-index {
    display: block;
    position: fixed;
    top: 50%;
    right: 22px;
    transform: translateY(-50%);
    width: 104px;
    z-index: 40;
  }
}

.page-about .about-index-title {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--muted);
  padding-bottom: 10px;
  margin-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-index-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-index-list a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 8px;
  font-size: 13px;
  color: var(--muted);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}

.page-about .about-index-list a span {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan);
  letter-spacing: 0.08em;
}

.page-about .about-index-list a:hover,
.page-about .about-index-list a:focus-visible {
  color: var(--white);
  border-left-color: var(--yellow);
  background: rgba(230, 255, 61, 0.06);
}

/* ============ 覆盖人群 ============ */

.page-about .about-reach {
  padding: 64px 0 8px;
}

.page-about .about-reach-grid {
  display: grid;
  gap: 36px;
}

@media (min-width: 980px) {
  .page-about .about-reach-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 56px;
    align-items: start;
  }
}

.page-about .about-reach-title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(24px, 4.6vw, 38px);
  line-height: 1.28;
  color: var(--white);
}

.page-about .about-reach-text {
  margin: 18px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-reach-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-reach-item {
  padding: 20px 0 22px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-reach-item h3 {
  margin: 12px 0 8px;
  font-size: 17px;
  font-weight: 600;
  color: var(--white);
}

.page-about .about-reach-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ============ 发展历程 ============ */

.page-about .about-stage-figure {
  margin: 36px 0 0;
}

.page-about .about-stage-caption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .about-stage-canvas {
  position: relative;
  margin-top: 56px;
}

.page-about .about-stage-rule {
  display: none;
}

@media (min-width: 900px) {
  .page-about .about-stage-rule {
    display: block;
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    opacity: 0.6;
  }
}

.page-about .about-stage-track {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 26px;
}

@media (min-width: 900px) {
  .page-about .about-stage-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0 22px;
  }
}

.page-about .about-stage-node {
  position: relative;
  padding: 24px 20px 24px;
  background: linear-gradient(160deg, rgba(18, 20, 31, 0.92), rgba(10, 14, 31, 0.72));
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  min-width: 0;
  transition: border-left-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-stage-node:hover {
  border-left-color: var(--yellow);
}

@media (min-width: 900px) {
  .page-about .about-stage-node:nth-child(1) { margin-top: 0; }
  .page-about .about-stage-node:nth-child(2) { margin-top: 56px; }
  .page-about .about-stage-node:nth-child(3) { margin-top: 112px; }
  .page-about .about-stage-node:nth-child(4) { margin-top: 168px; }
}

.page-about .about-stage-dot {
  position: absolute;
  top: -7px;
  left: 18px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--midnight);
  border: 2px solid var(--violet);
  box-shadow: 0 0 12px rgba(122, 43, 255, 0.7);
}

@media (min-width: 900px) {
  .page-about .about-stage-node:nth-child(2) .about-stage-dot { border-color: var(--cyan); box-shadow: 0 0 12px rgba(20, 224, 210, 0.7); }
  .page-about .about-stage-node:nth-child(3) .about-stage-dot { border-color: var(--orange); box-shadow: 0 0 12px rgba(255, 106, 31, 0.7); }
  .page-about .about-stage-node:nth-child(4) .about-stage-dot { border-color: var(--yellow); box-shadow: 0 0 12px rgba(230, 255, 61, 0.7); }
}

.page-about .about-stage-year {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  padding-top: 8px;
}

.page-about .about-stage-title {
  margin: 10px 0 10px;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--white);
}

.page-about .about-stage-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--muted);
}

.page-about .about-stage-note {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--violet);
}

/* ============ 厅别频道 ============ */

.page-about .about-rooms-layout {
  display: grid;
  gap: 34px;
  margin-top: 8px;
}

@media (min-width: 1024px) {
  .page-about .about-rooms-layout {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.5fr);
    gap: 40px;
    align-items: start;
  }
}

.page-about .about-rooms-figure {
  margin: 0;
}

.page-about .about-rooms-caption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

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

@media (min-width: 640px) {
  .page-about .about-rooms-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-room {
  position: relative;
  padding: 18px 16px 20px;
  min-width: 0;
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

@media (min-width: 1200px) {
  .page-about .about-rooms-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-room:nth-child(2),
  .page-about .about-room:nth-child(4),
  .page-about .about-room:nth-child(6),
  .page-about .about-room:nth-child(8) {
    margin-top: 18px;
  }
}

.page-about .about-room:hover,
.page-about .about-room:focus-visible {
  border-color: rgba(20, 224, 210, 0.55);
  transform: translateY(-2px);
  outline: none;
}

.page-about .about-room-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  margin-bottom: 10px;
}

.page-about .about-room-name {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 600;
  color: var(--white);
}

.page-about .about-room-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-room-hint {
  margin: 14px 0 0;
  padding-top: 10px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: rgba(156, 151, 204, 0.75);
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  transition: opacity 0.2s var(--ease), max-height 0.24s var(--ease);
}

.page-about .about-room:hover .about-room-hint,
.page-about .about-room:focus-visible .about-room-hint,
.page-about .about-room:focus-within .about-room-hint {
  opacity: 1;
  max-height: 4em;
}

@media (hover: none) {
  .page-about .about-room-hint {
    opacity: 1;
    max-height: 4em;
  }
}

.page-about .about-cats {
  margin-top: 44px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.page-about .about-cats-title {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(20px, 3.4vw, 28px);
  color: var(--white);
}

.page-about .about-cats-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

@media (min-width: 720px) {
  .page-about .about-cats-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 32px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-cats-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-cats-list li {
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  min-width: 0;
}

.page-about .about-cats-list strong {
  display: block;
  font-size: 15px;
  color: var(--white);
  margin-bottom: 6px;
}

.page-about .about-cats-list span {
  display: block;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ============ 团队 ============ */

.page-about .about-team-layout {
  display: grid;
  gap: 34px;
}

@media (min-width: 1024px) {
  .page-about .about-team-layout {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.85fr);
    gap: 48px;
    align-items: start;
  }
}

.page-about .about-team-text {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.88;
  color: var(--muted);
}

.page-about .about-team-roles {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-team-role {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
  min-width: 0;
}

.page-about .about-team-role-num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--orange);
  padding-top: 3px;
}

.page-about .about-team-role h3 {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 600;
  color: var(--white);
}

.page-about .about-team-role p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-team-foot {
  margin: 24px 0 0;
  padding: 16px 18px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--white);
  background: linear-gradient(120deg, rgba(122, 43, 255, 0.14), rgba(20, 224, 210, 0.08));
  border-left: 2px solid var(--violet);
}

.page-about .about-team-figure {
  margin: 0;
}

@media (min-width: 1024px) {
  .page-about .about-team-figure {
    position: sticky;
    top: calc(var(--header-h) + 32px);
  }
}

.page-about .about-team-caption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
}

/* ============ 合作与荣誉 ============ */

.page-about .about-partners-grid {
  display: grid;
  gap: 34px;
}

@media (min-width: 960px) {
  .page-about .about-partners-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 48px;
    align-items: start;
  }
}

.page-about .about-partner-title {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-partner-list,
.page-about .about-honor-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-partner-list li {
  padding: 18px 0 20px;
  border-bottom: 1px solid var(--line);
  min-width: 0;
}

.page-about .about-partner-list p {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-honor-list li {
  display: grid;
  grid-template-columns: 66px minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
  min-width: 0;
}

.page-about .about-honor-num {
  font-family: var(--font-display);
  font-weight: 200;
  font-size: 26px;
  line-height: 1;
  color: var(--white);
  letter-spacing: 0.01em;
}

.page-about .about-honor-label {
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-honor-foot {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(234, 240, 255, 0.78);
}

/* ============ 收束 CTA ============ */

.page-about .about-cta {
  margin-top: 56px;
  display: grid;
  gap: 24px;
  padding: 30px 24px 34px;
  background: linear-gradient(135deg, rgba(122, 43, 255, 0.16), rgba(18, 20, 31, 0.92) 55%, rgba(20, 224, 210, 0.1));
}

@media (min-width: 860px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 36px;
    padding: 38px 36px 42px;
  }
}

.page-about .about-cta-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(22px, 4vw, 32px);
  line-height: 1.3;
  color: var(--white);
}

.page-about .about-cta-text p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
  max-width: 42em;
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-room,
  .page-about .about-stage-node,
  .page-about .about-index-list a {
    transition: none;
  }
}