.page-about {
  position: relative;
}

.page-about .container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

.page-about .about-hero {
  position: relative;
  padding: 32px 0 0;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -160px;
  right: -120px;
  width: 480px;
  height: 480px;
  background: radial-gradient(circle, rgba(164, 76, 240, 0.3), transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.page-about .about-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: "Inter", "PingFang SC", sans-serif;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 0 0 28px;
}

.page-about .about-breadcrumb a {
  color: var(--electric-blue);
  text-decoration: none;
  transition: color 0.3s ease;
}

.page-about .about-breadcrumb a:hover {
  color: var(--neon-bright);
}

.page-about .about-hero-copy {
  position: relative;
  z-index: 1;
}

.page-about .about-hero-copy .eyebrow {
  margin: 0 0 8px;
}

.page-about .about-headline {
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  font-weight: 700;
  font-style: italic;
  transform: skewX(-5deg);
  font-size: clamp(1.9rem, 5vw, 3.6rem);
  line-height: 1.15;
  color: var(--text-primary);
  margin: 16px 0 20px;
  max-width: 900px;
}

.page-about .about-lede {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-secondary);
  max-width: 720px;
  font-weight: 300;
  margin: 0 0 28px;
}

.page-about .about-hero-index {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 16px;
  margin: 0 0 32px;
  max-width: 520px;
}

.page-about .about-hero-index a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 0;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.875rem;
  border-bottom: 1px solid rgba(18, 42, 86, 0.7);
  transition: color 0.3s ease, border-color 0.3s ease;
}

.page-about .about-hero-index a:hover {
  color: var(--lime);
  border-color: var(--lime);
}

.page-about .about-hero-figure {
  margin: 0;
  border-radius: 32px;
  overflow: hidden;
  position: relative;
  background: linear-gradient(135deg, var(--bg-space-2), var(--ink-blue));
}

.page-about .about-hero-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 32px;
  background: linear-gradient(120deg, rgba(123, 47, 191, 0.24), transparent 50%, rgba(0, 212, 255, 0.14));
  pointer-events: none;
}

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

.page-about .about-origin {
  padding: 72px 0 0;
}

.page-about .about-origin-inner {
  display: grid;
  gap: 24px;
}

.page-about .about-index-label {
  font-family: "Inter", "PingFang SC", sans-serif;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--lime);
  margin: 0;
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .about-index-label span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  border-radius: 999px;
  background: var(--lime);
  color: var(--bg-space);
  font-weight: 700;
}

.page-about .about-origin-copy {
  background: var(--warm-gray);
  border-radius: 32px;
  padding: 32px 28px;
  color: var(--ink-blue);
}

.page-about .about-origin-copy h2 {
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 600;
  margin: 0 0 16px;
}

.page-about .about-origin-copy p {
  font-size: 0.975rem;
  line-height: 1.8;
  font-weight: 300;
  color: #2A3550;
  margin: 0 0 16px;
}

.page-about .about-origin-copy p:last-child {
  margin-bottom: 0;
}

.page-about .about-origin-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.page-about .about-origin-meta .meta-chip {
  background: rgba(123, 47, 191, 0.08);
  color: var(--neon-purple);
  border: 1px solid rgba(123, 47, 191, 0.16);
}

.page-about .about-timeline-section {
  padding: 72px 0 0;
}

.page-about .about-section-head {
  margin-bottom: 40px;
}

.page-about .about-section-title {
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  font-weight: 700;
  font-style: italic;
  transform: skewX(-5deg);
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  margin: 12px 0 12px;
  color: var(--text-primary);
}

.page-about .about-section-head p {
  color: var(--text-secondary);
  line-height: 1.7;
  font-weight: 300;
  max-width: 640px;
  margin: 0;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 24px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--ink-blue);
  opacity: 0.5;
}

.page-about .about-timeline-item {
  position: relative;
  padding: 0 0 32px 64px;
}

.page-about .about-timeline-item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline-dot {
  position: absolute;
  left: 14px;
  top: 8px;
  width: 22px;
  height: 22px;
  border-radius: 999px;
  background: var(--lime);
  box-shadow: 0 0 0 6px rgba(198, 244, 50, 0.16);
  animation: about-pulse 3s ease-in-out infinite;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.page-about .about-timeline-item:hover .about-timeline-dot {
  transform: scale(1.2);
  box-shadow: 0 0 0 10px rgba(198, 244, 50, 0.24);
}

@keyframes about-pulse {
  0%, 100% {
    box-shadow: 0 0 0 6px rgba(198, 244, 50, 0.14);
  }
  50% {
    box-shadow: 0 0 0 12px rgba(198, 244, 50, 0.22);
  }
}

.page-about .about-timeline-year {
  font-family: "Inter", "PingFang SC", sans-serif;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  font-weight: 700;
  color: var(--electric-blue);
  margin-bottom: 8px;
}

.page-about .about-timeline-card {
  background: var(--warm-gray);
  border-radius: 24px;
  padding: 24px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.page-about .about-timeline-card summary {
  list-style: none;
  cursor: pointer;
  position: relative;
  padding-right: 40px;
}

.page-about .about-timeline-card summary::-webkit-details-marker {
  display: none;
}

.page-about .about-timeline-card h3 {
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 1.1rem;
  font-weight: 600;
  margin: 0;
  color: var(--ink-blue);
}

.page-about .about-timeline-card summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--ink-blue);
  color: var(--lime);
  font-size: 1rem;
  transition: transform 0.3s ease, background 0.3s ease;
}

.page-about .about-timeline-card[open] summary::after {
  content: "-";
  background: var(--neon-purple);
  color: var(--white);
}

.page-about .about-timeline-card p {
  font-size: 0.9rem;
  line-height: 1.75;
  margin: 12px 0 0;
  color: #2A3550;
  font-weight: 300;
}

.page-about .about-timeline-item:hover .about-timeline-card {
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.16);
}

.page-about .about-tech {
  padding: 72px 0 0;
}

.page-about .about-tech-grid {
  display: grid;
  gap: 28px;
  align-items: center;
}

.page-about .about-tech-copy > p {
  color: var(--text-secondary);
  line-height: 1.75;
  font-weight: 300;
  margin-bottom: 20px;
}

.page-about .about-tech-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-tech-list li {
  display: grid;
  gap: 4px;
  padding: 18px 20px;
  background: rgba(16, 34, 75, 0.6);
  border-radius: 20px;
  border-left: 3px solid var(--electric-blue);
  transition: background 0.3s ease, border-color 0.3s ease, transform 0.3s ease;
}

.page-about .about-tech-list li:hover {
  background: rgba(123, 47, 191, 0.18);
  border-color: var(--lime);
  transform: translateX(4px);
}

.page-about .about-tech-list strong {
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
}

.page-about .about-tech-list span {
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--text-secondary);
  font-weight: 300;
}

.page-about .about-tech-figure {
  margin: 0;
  border-radius: 32px;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: linear-gradient(135deg, var(--bg-space-2), var(--neon-purple));
}

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

.page-about .about-cert {
  padding: 72px 0 0;
}

.page-about .about-cert-grid {
  display: grid;
  gap: 20px;
}

.page-about .about-cert-card {
  background: rgba(16, 34, 75, 0.45);
  border: 1px solid rgba(0, 212, 255, 0.16);
  border-radius: 28px;
  padding: 28px 24px;
  display: grid;
  gap: 16px;
  align-content: start;
  transition: border-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
}

.page-about .about-cert-card:hover {
  border-color: var(--electric-blue);
  transform: translateY(-4px);
  box-shadow: 0 16px 32px rgba(0, 0, 0, 0.24);
}

.page-about .about-cert-figure {
  margin: 0;
  width: 96px;
  height: 96px;
  border-radius: 18px;
  overflow: hidden;
  background: var(--ink-blue);
}

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

.page-about .about-cert-number {
  width: 56px;
  height: 56px;
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Inter", "PingFang SC", sans-serif;
  font-weight: 700;
  font-size: 1.2rem;
  background: linear-gradient(135deg, var(--neon-purple), var(--neon-bright));
  color: var(--white);
}

.page-about .about-cert-card h3 {
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 1.15rem;
  font-weight: 600;
  margin: 0;
  color: var(--text-primary);
}

.page-about .about-cert-card p {
  font-size: 0.9rem;
  line-height: 1.7;
  margin: 0;
  color: var(--text-secondary);
  font-weight: 300;
}

.page-about .about-stats {
  padding: 72px 0;
}

.page-about .about-stats-panel {
  background: linear-gradient(135deg, rgba(123, 47, 191, 0.18), rgba(16, 34, 75, 0.7));
  border: 1px solid rgba(164, 76, 240, 0.25);
  border-radius: 32px;
  padding: 36px 28px;
}

.page-about .about-stats-head {
  margin-bottom: 24px;
}

.page-about .about-stats-head p {
  color: var(--text-secondary);
  font-weight: 300;
  line-height: 1.6;
  margin: 0;
}

.page-about .about-stats-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.page-about .about-stat {
  background: rgba(8, 15, 36, 0.6);
  border-radius: 24px;
  padding: 24px 20px;
  text-align: center;
  transition: background 0.3s ease, transform 0.3s ease;
}

.page-about .about-stat:hover {
  background: rgba(0, 212, 255, 0.12);
  transform: translateY(-3px);
}

.page-about .about-stat strong {
  display: block;
  font-family: "Inter", "PingFang SC", sans-serif;
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 800;
  color: var(--lime);
}

@supports ((background-clip: text) or (-webkit-background-clip: text)) {
  .page-about .about-stat strong {
    background: linear-gradient(135deg, var(--lime), var(--electric-blue));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }
}

.page-about .about-stat span {
  display: block;
  margin-top: 8px;
  color: var(--text-secondary);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
}

.page-about .about-more {
  padding: 0 0 72px;
}

.page-about .about-more-head {
  margin-bottom: 28px;
}

.page-about .about-more-grid {
  display: grid;
  gap: 20px;
}

.page-about .about-more-card {
  display: grid;
  gap: 12px;
  padding: 28px 24px;
  background: rgba(16, 34, 75, 0.5);
  border-radius: 28px;
  text-decoration: none;
  border: 1px solid rgba(164, 76, 240, 0.22);
  transition: border-color 0.3s ease, background 0.3s ease, transform 0.3s ease;
}

.page-about .about-more-card:hover {
  border-color: var(--lime);
  background: rgba(123, 47, 191, 0.14);
  transform: translateY(-4px);
}

.page-about .about-more-num {
  font-family: "Inter", "PingFang SC", sans-serif;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  color: var(--electric-blue);
  text-transform: uppercase;
}

.page-about .about-more-card h3 {
  font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 1.2rem;
  font-weight: 600;
  margin: 0;
  color: var(--text-primary);
}

.page-about .about-more-card p {
  font-size: 0.9rem;
  line-height: 1.7;
  margin: 0;
  color: var(--text-secondary);
  font-weight: 300;
}

.page-about .about-more-card .link-arrow {
  color: var(--lime);
  text-decoration: none;
  font-size: 0.85rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 4px;
}

.page-about .about-more-card .link-arrow::after {
  content: "→";
  transition: transform 0.3s ease;
}

.page-about .about-more-card:hover .link-arrow::after {
  transform: translateX(4px);
}

.page-about #origin,
.page-about #timeline,
.page-about #tech,
.page-about #cert {
  scroll-margin-top: 120px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline-dot {
    animation: none;
  }
}

@media (min-width: 860px) {
  .page-about .about-hero {
    padding-top: 48px;
  }

  .page-about .about-hero-copy {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 320px;
    grid-template-areas:
      "breadcrumb breadcrumb"
      "eyebrow    index"
      "headline   index"
      "lede       index";
    column-gap: 48px;
    align-items: start;
  }

  .page-about .about-breadcrumb {
    grid-area: breadcrumb;
  }

  .page-about .about-hero-copy .eyebrow {
    grid-area: eyebrow;
  }

  .page-about .about-headline {
    grid-area: headline;
    margin-top: 12px;
  }

  .page-about .about-lede {
    grid-area: lede;
    margin-bottom: 0;
  }

  .page-about .about-hero-index {
    grid-area: index;
    width: 100%;
    margin: 0;
    max-width: none;
  }

  .page-about .about-origin-inner {
    grid-template-columns: 160px minmax(0, 1fr);
    gap: 48px;
  }

  .page-about .about-index-label {
    position: sticky;
    top: 120px;
    align-self: start;
  }

  .page-about .about-timeline::before {
    left: 25px;
  }

  .page-about .about-timeline-item {
    display: grid;
    grid-template-columns: 50px 140px minmax(0, 1fr);
    gap: 24px;
    align-items: start;
    padding: 0 0 36px;
  }

  .page-about .about-timeline-dot {
    position: static;
    justify-self: center;
    margin-top: 6px;
  }

  .page-about .about-timeline-year {
    margin-bottom: 0;
    line-height: 34px;
    text-align: right;
  }

  .page-about .about-timeline-card {
    max-width: 640px;
  }

  .page-about .about-tech-grid {
    grid-template-columns: minmax(0, 1fr) minmax(280px, 0.8fr);
    gap: 48px;
  }

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

  .page-about .about-stats-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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