.page-about {
  position: relative;
  isolation: isolate;
  --about-rail: 190px;
  --about-rule: rgba(42, 53, 102, 0.75);
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--line-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-soft) 1px, transparent 1px);
  background-size: 88px 88px;
  opacity: 0.26;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, rgba(0, 0, 0, 0.25) 55%, transparent 88%);
  mask-image: linear-gradient(to bottom, #000 0%, rgba(0, 0, 0, 0.25) 55%, transparent 88%);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: clamp(18px, 3vw, 30px);
}

.page-about .about-crumb .breadcrumb {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--concrete);
}

.page-about .about-crumb .breadcrumb a {
  color: var(--concrete);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-crumb .breadcrumb a:hover {
  color: var(--lime);
  border-bottom-color: var(--lime);
}

.page-about .about-crumb .breadcrumb span[aria-current="page"] {
  color: var(--ice);
}

/* ---------- 首屏封面 ---------- */
.page-about .about-cover {
  padding-top: clamp(28px, 5vw, 52px);
  padding-bottom: clamp(28px, 4vw, 46px);
}

.page-about .about-cover-grid {
  display: grid;
  gap: clamp(22px, 3.4vw, 44px);
  border-bottom: 1px solid var(--line);
  padding-bottom: clamp(26px, 4vw, 44px);
}

.page-about .about-cover .exhibit-mark {
  margin-bottom: clamp(14px, 2vw, 22px);
}

.page-about .about-cover h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(38px, 8.4vw, 84px);
  line-height: 0.98;
  letter-spacing: -0.02em;
  color: var(--ice);
  margin: 0;
  max-width: 13ch;
}

.page-about .about-cover .lede {
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.78;
  color: var(--text-soft);
  margin: 0 0 clamp(20px, 2.6vw, 30px);
  max-width: 46ch;
}

.page-about .about-figures {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-figures li {
  background: var(--stand);
  padding: clamp(12px, 1.6vw, 18px);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-figures .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.6vw, 30px);
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--lime);
  line-height: 1;
}

.page-about .about-figures .stat-label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--concrete);
}

/* ---------- 锚点条 ---------- */
.page-about .about-anchors {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: clamp(20px, 2.6vw, 30px);
}

.page-about .about-anchors a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: rgba(27, 35, 80, 0.5);
  color: var(--text-soft);
  font-size: 13px;
  text-decoration: none;
  transition: border-color 180ms var(--ease), color 180ms var(--ease), transform 180ms var(--ease);
}

.page-about .about-anchors a .mono {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--amber);
}

.page-about .about-anchors a:hover {
  border-color: var(--lime);
  color: var(--ice);
  transform: translateY(-2px);
}

/* ---------- 叙事流 ---------- */
.page-about .story-flow {
  padding-bottom: clamp(30px, 5vw, 60px);
}

.page-about .story-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.4vw, 26px);
  padding: clamp(30px, 5vw, 62px) 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .story-row--last {
  border-bottom: none;
}

.page-about .story-rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-left: 14px;
  border-left: 2px solid var(--lime);
}

.page-about .story-year {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--lime);
  text-transform: uppercase;
}

.page-about .story-phase {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--concrete);
}

.page-about .story-body {
  min-width: 0;
}

.page-about .story-body h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 4.4vw, 46px);
  line-height: 1.04;
  letter-spacing: -0.015em;
  color: var(--ice);
  margin: 0 0 clamp(14px, 2vw, 22px);
  max-width: 18ch;
}

.page-about .story-body > p {
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--text-soft);
  margin: 0 0 1em;
  max-width: 62ch;
}

.page-about .story-body > p:last-child {
  margin-bottom: 0;
}

.page-about .story-body a {
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(200, 255, 62, 0.42);
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

.page-about .story-body a:hover {
  color: var(--ice);
  border-bottom-color: var(--ice);
}

/* ---------- 图片与图注 ---------- */
.page-about .story-figure {
  margin: 0 0 clamp(18px, 2.4vw, 26px);
  position: relative;
  background: var(--indigo);
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .story-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .story-figure figcaption {
  padding: 12px 16px;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--concrete);
  border-top: 1px solid var(--line-soft);
  background: rgba(5, 7, 15, 0.55);
}

.page-about .story-figure figcaption .mono {
  display: inline-block;
  font-family: var(--font-mono);
  color: var(--amber);
  letter-spacing: 0.06em;
  margin-right: 6px;
}

.page-about .story-figure--banner {
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), calc(100% - 30px) 100%, 0 100%);
}

.page-about .story-figure--inset {
  margin-top: clamp(20px, 3vw, 32px);
  max-width: 720px;
}

/* ---------- 团队分屏 ---------- */
.page-about .team-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.6vw, 30px);
  align-items: start;
}

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

.page-about .team-split-text p {
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--text-soft);
  margin: 0 0 1em;
}

.page-about .team-split-text p:last-child {
  margin-bottom: 0;
}

/* ---------- 三阶段 ---------- */
.page-about .phase-track {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .phase-item {
  background: var(--stand);
  padding: clamp(18px, 2.4vw, 26px);
  position: relative;
  transition: background 200ms var(--ease), transform 200ms var(--ease);
}

.page-about .phase-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 0;
  background: var(--lime);
  transition: height 240ms var(--ease);
}

.page-about .phase-item:hover {
  background: #212a5e;
  transform: translateY(-3px);
}

.page-about .phase-item:hover::before {
  height: 100%;
}

.page-about .phase-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--amber);
  padding: 3px 8px;
  border: 1px solid rgba(255, 138, 61, 0.5);
  margin-bottom: 12px;
}

.page-about .phase-item h3 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(19px, 2.2vw, 24px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--ice);
  margin: 0 0 10px;
}

.page-about .phase-item p {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-soft);
  margin: 0;
}

/* ---------- 合作生态 ---------- */
.page-about .partner-grid {
  list-style: none;
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2vw, 22px);
}

.page-about .partner-item {
  padding: clamp(18px, 2.2vw, 24px);
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(27, 35, 80, 0.92), rgba(14, 20, 48, 0.92));
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  transition: border-color 200ms var(--ease), transform 200ms var(--ease);
}

.page-about .partner-item:hover {
  border-color: rgba(200, 255, 62, 0.45);
  transform: translateY(-4px);
}

.page-about .partner-item .tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 3px 9px;
  border: 1px solid var(--line);
  color: var(--lime);
  margin-bottom: 12px;
}

.page-about .partner-item .tag--amber {
  color: var(--amber);
  border-color: rgba(255, 138, 61, 0.5);
}

.page-about .partner-item h3 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.15;
  color: var(--ice);
  margin: 0 0 10px;
}

.page-about .partner-item p {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-soft);
  margin: 0;
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  padding-bottom: clamp(44px, 7vw, 90px);
}

.page-about .about-cta-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 36px);
  padding: clamp(24px, 3.4vw, 44px);
  background: linear-gradient(135deg, rgba(27, 35, 80, 0.95), rgba(14, 20, 48, 0.98));
  border: 1px solid var(--line);
}

.page-about .about-cta-text .exhibit-mark {
  margin-bottom: 16px;
}

.page-about .about-cta-text h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 3.4vw, 36px);
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--ice);
  margin: 0 0 14px;
  max-width: 24ch;
}

.page-about .about-cta-text p {
  font-size: clamp(14.5px, 1.55vw, 16.5px);
  line-height: 1.78;
  color: var(--text-soft);
  margin: 0;
  max-width: 56ch;
}

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

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

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

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

  .page-about .about-cta-panel {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }
}

@media (min-width: 900px) {
  .page-about .about-cover-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: end;
  }

  .page-about .story-row {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(24px, 3vw, 48px);
    align-items: start;
  }

  .page-about .story-row--last {
    padding-bottom: clamp(40px, 5vw, 70px);
  }

  .page-about .story-rail {
    position: sticky;
    top: 128px;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding-left: 16px;
    border-left: 2px solid var(--lime);
  }

  .page-about .story-year {
    font-size: 20px;
    line-height: 1.1;
  }

  .page-about .story-phase {
    font-size: 11px;
  }

  .page-about .team-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  }

  .page-about .story-row--split .story-body h2 {
    max-width: 14ch;
  }
}

@media (min-width: 1180px) {
  .page-about {
    --about-rail: 220px;
  }

  .page-about .story-body > p {
    max-width: 60ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .phase-item,
  .page-about .partner-item,
  .page-about .about-anchors a {
    transition: none;
  }

  .page-about .phase-item:hover,
  .page-about .partner-item:hover,
  .page-about .about-anchors a:hover {
    transform: none;
  }
}