.page-about {
  --page-y-sm: 40px;
  --page-y-md: 72px;
  position: relative;
  background: var(--bg);
  color: var(--text);
}

.page-about .breadcrumb {
  position: relative;
  z-index: 3;
  padding-top: 16px;
  padding-bottom: 8px;
}

.page-about__hero {
  position: relative;
  overflow: hidden;
  padding-bottom: var(--page-y-sm);
}

.page-about__hero-decor {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.page-about__hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  gap: 24px;
  align-items: center;
}

.page-about__kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

.page-about__kicker::before {
  content: "";
  display: block;
  width: 28px;
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
}

.page-about__hero-title {
  margin-bottom: 16px;
  font-family: var(--font-sans);
  font-size: clamp(32px, 6vw, 56px);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about__hero-lead {
  max-width: 34em;
  margin-bottom: 24px;
  font-family: var(--font-serif);
  font-size: clamp(16px, 2vw, 20px);
  line-height: 1.6;
  color: var(--text-2);
}

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

.page-about__hero-media {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(0, 230, 118, 0.25);
  border-radius: var(--radius-l);
  box-shadow: var(--shadow);
}

.page-about__hero-img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about__hero-status {
  position: absolute;
  right: 16px;
  bottom: 16px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid rgba(0, 230, 118, 0.4);
  border-radius: var(--radius-pill);
  background: rgba(10, 22, 40, 0.85);
  color: var(--text);
  font-size: 13px;
  font-weight: 500;
  backdrop-filter: blur(6px);
}

.page-about__section-head {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 18px;
  margin-bottom: 28px;
}

.page-about__section-copy {
  position: relative;
  z-index: 1;
  min-width: 0;
}

.page-about__section-index {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: clamp(44px, 6vw, 88px);
  font-weight: 700;
  line-height: 0.85;
  letter-spacing: -0.04em;
  color: var(--bg-2);
  user-select: none;
}

.page-about__section-kicker {
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
}

.page-about__section-title {
  margin-bottom: 8px;
  font-family: var(--font-sans);
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about__section-desc {
  max-width: 36em;
  font-size: 15px;
  line-height: 1.6;
  color: var(--text-2);
}

.page-about__claim {
  padding: var(--page-y-sm) 0;
}

.page-about__claim-grid {
  display: grid;
  gap: 28px;
}

.page-about__claim-quote {
  padding: 24px;
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-l);
  background: linear-gradient(135deg, rgba(27, 43, 75, 0.7), rgba(16, 30, 54, 0.4));
}

.page-about__claim-text {
  margin-bottom: 12px;
  font-family: var(--font-serif);
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 600;
  line-height: 1.35;
  color: var(--text);
}

.page-about__claim-desc {
  margin-bottom: 16px;
  font-size: 15px;
  line-height: 1.65;
  color: var(--text-2);
}

.page-about__claim-link {
  display: inline-block;
  font-size: 14px;
  font-weight: 700;
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 230, 118, 0.4);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about__claim-link:hover {
  color: var(--accent-orange);
  border-color: var(--accent-orange);
}

.page-about__claim-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.page-about__stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  border: 1px solid rgba(201, 209, 217, 0.12);
  border-radius: var(--radius-m);
  background: var(--bg-2);
}

.page-about__stat-num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 700;
  line-height: 1;
  color: var(--accent);
}

.page-about__stat-unit {
  margin-left: 2px;
  font-size: 0.6em;
  font-weight: 400;
  color: var(--text-3);
}

.page-about__stat-label {
  font-size: 13px;
  line-height: 1.4;
  color: var(--text-2);
}

.page-about__timeline {
  position: relative;
  padding: var(--page-y-sm) 0;
}

.page-about__timeline::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: clamp(120px, 20vw, 320px);
  background: radial-gradient(ellipse at center, rgba(0, 230, 118, 0.05), transparent 70%);
  pointer-events: none;
}

.page-about__timeline-wrap {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.page-about__timeline-axis {
  position: absolute;
  left: 15px;
  top: 0;
  bottom: 0;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(to bottom, var(--accent) 0%, var(--accent) 10%, rgba(0, 230, 118, 0.2) 50%, var(--bg-2) 100%);
}

.page-about__timeline-item {
  position: relative;
  padding-left: 48px;
}

.page-about__timeline-node {
  position: absolute;
  left: 6px;
  top: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
}

.page-about__timeline-ring {
  position: absolute;
  width: 100%;
  height: 100%;
  border: 2px solid var(--accent);
  border-radius: 50%;
  background: var(--bg);
  animation: page-about-pulse 2.6s var(--ease) infinite;
}

.page-about__timeline-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px rgba(0, 230, 118, 0.6);
}

.page-about__timeline-card {
  padding: 20px;
  border: 1px solid rgba(201, 209, 217, 0.12);
  border-radius: var(--radius-l);
  background: var(--bg-2);
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.page-about__timeline-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent-orange);
  box-shadow: var(--shadow);
}

.page-about__timeline-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.page-about__timeline-year {
  font-family: var(--font-mono);
  font-size: clamp(24px, 4vw, 32px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--accent);
}

.page-about__timeline-title {
  margin-bottom: 8px;
  font-family: var(--font-sans);
  font-size: 18px;
  font-weight: 800;
  color: var(--text);
}

.page-about__timeline-text {
  margin-bottom: 12px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-2);
}

.page-about__timeline-detail {
  margin-top: 4px;
  padding-top: 10px;
  border-top: 1px solid rgba(201, 209, 217, 0.14);
}

.page-about__timeline-detail summary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  cursor: pointer;
  user-select: none;
  list-style: none;
  transition: color 0.2s ease;
}

.page-about__timeline-detail summary::-webkit-details-marker {
  display: none;
}

.page-about__timeline-detail summary::before {
  content: "↘";
  display: inline-block;
  font-size: 12px;
  transition: transform 0.25s var(--ease);
}

.page-about__timeline-detail[open] summary::before {
  transform: rotate(-45deg);
}

.page-about__timeline-detail ul {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin: 10px 0 0;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.55;
  color: var(--text-2);
}

.page-about__data {
  padding: var(--page-y-sm) 0;
  background:
    linear-gradient(rgba(0, 230, 118, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 230, 118, 0.04) 1px, transparent 1px),
    linear-gradient(180deg, transparent 0%, rgba(27, 43, 75, 0.35) 40%, transparent 100%);
  background-size: 32px 32px, 32px 32px, 100% 100%;
}

.page-about__data-grid {
  display: grid;
  gap: 24px;
  align-items: center;
}

.page-about__data-lead {
  margin-bottom: 18px;
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.6;
  color: var(--text);
}

.page-about__data-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-about__data-list li {
  padding: 10px 14px;
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-m);
  background: rgba(16, 30, 54, 0.5);
  font-size: 14px;
  line-height: 1.55;
  color: var(--text-2);
}

.page-about__data-list strong {
  margin-right: 6px;
  font-weight: 700;
  color: var(--text);
}

.page-about__data-media {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid rgba(201, 209, 217, 0.12);
  border-radius: var(--radius-l);
}

.page-about__data-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about__data-media figcaption {
  position: absolute;
  right: 12px;
  bottom: 12px;
  left: 12px;
  padding: 8px 12px;
  border: 1px solid rgba(201, 209, 217, 0.15);
  border-radius: var(--radius-m);
  background: rgba(10, 22, 40, 0.85);
  font-size: 12px;
  text-align: center;
  color: var(--text-2);
}

.page-about__sichuan {
  padding: var(--page-y-sm) 0;
}

.page-about__sichuan-wrap {
  display: grid;
  gap: 24px;
  align-items: center;
}

.page-about__sichuan-media {
  margin: 0;
  overflow: hidden;
  border: 1px solid rgba(201, 209, 217, 0.12);
  border-radius: var(--radius-l);
  box-shadow: var(--shadow);
}

.page-about__sichuan-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about__sichuan-text {
  margin-bottom: 12px;
  font-size: 15px;
  line-height: 1.65;
  color: var(--text-2);
}

.page-about__sichuan-text:first-child {
  font-size: 16px;
  font-weight: 500;
  color: var(--text);
}

.page-about__sichuan-badges {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 16px;
}

.page-about__sichuan-link {
  margin-left: 4px;
}

.page-about__trust {
  padding-bottom: var(--page-y-sm);
}

.page-about__trust-card {
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding: 24px;
  border: 1px solid rgba(0, 230, 118, 0.2);
  border-radius: var(--radius-l);
  background: linear-gradient(135deg, rgba(27, 43, 75, 0.9), rgba(16, 30, 54, 0.7));
}

.page-about__trust-status {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 700;
  color: var(--accent);
}

.page-about__trust-text {
  margin: 0;
  max-width: 42em;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-2);
}

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

@keyframes page-about-pulse {
  0%, 100% {
    transform: scale(1);
    opacity: 0.9;
  }
  50% {
    transform: scale(1.35);
    opacity: 0.4;
  }
}

@media (min-width: 960px) {
  .page-about {
    --page-y-sm: var(--page-y-md);
  }

  .page-about__hero-inner {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 48px;
  }

  .page-about__hero-title {
    font-size: 56px;
  }

  .page-about__claim-grid {
    grid-template-columns: 1.2fr 1fr;
    align-items: center;
    gap: 48px;
  }

  .page-about__claim-quote {
    padding: 36px;
  }

  .page-about__claim-stats {
    gap: 16px;
  }

  .page-about__timeline-wrap {
    max-width: 860px;
    margin-right: auto;
    margin-left: auto;
  }

  .page-about__timeline-item {
    padding-left: 64px;
  }

  .page-about__timeline-axis {
    left: 19px;
  }

  .page-about__timeline-card {
    padding: 26px;
  }

  .page-about__data-grid {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
  }

  .page-about__data-list li {
    font-size: 15px;
  }

  .page-about__sichuan-wrap {
    grid-template-columns: 0.8fr 1.2fr;
    gap: 48px;
  }

  .page-about__trust-card {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 32px;
  }
}

@media (min-width: 1280px) {
  .page-about__section-index {
    position: absolute;
    top: -10px;
    right: 0;
    color: rgba(27, 43, 75, 0.55);
  }
}