.page-about {
  background: var(--cream);
  color: var(--ink);
  overflow-x: hidden;
}

/* Hero Section */
.page-about .about-hero {
  position: relative;
  padding: 2rem 1.5rem 0;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}

.page-about .hero-year {
  position: absolute;
  top: 0.5rem;
  right: -0.15rem;
  font-family: var(--font-display);
  font-size: clamp(8rem, 25vw, 16rem);
  line-height: 1;
  color: rgba(10, 31, 68, 0.06);
  pointer-events: none;
  user-select: none;
  z-index: 0;
}

.page-about .hero-copy {
  position: relative;
  z-index: 1;
  max-width: 720px;
}

.page-about .hero-copy h1 {
  font-family: var(--font-heading);
  font-size: clamp(2.6rem, 8vw, 4.8rem);
  line-height: 1.1;
  margin: 0.75rem 0 1rem;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .hero-description {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.8;
  color: var(--muted);
  margin-bottom: 1.5rem;
  max-width: 36em;
}

.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.page-about .button--primary {
  background-color: var(--orange);
  color: var(--paper);
  border: 1px solid var(--orange);
  padding: 0.75rem 1.4rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .button--primary:hover {
  background-color: #E05F00;
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(255, 107, 0, 0.25);
}

.page-about .button--ghost {
  background-color: transparent;
  color: var(--navy);
  border: 1px solid var(--navy);
  padding: 0.75rem 1.4rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.2s ease, background-color 0.2s ease;
}

.page-about .button--ghost:hover {
  background-color: var(--navy);
  color: var(--cream);
  transform: translateY(-2px);
}

.page-about .hero-media {
  position: relative;
  z-index: 1;
  margin: 0 -1.5rem;
}

.page-about .hero-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 16 / 6;
  border-radius: 12px 12px 0 0;
  box-shadow: var(--shadow-soft);
}

/* 通用容器与章节间距 */
.page-about .page-shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.page-about section {
  padding: 3rem 0;
  border-bottom: 1px solid var(--border);
}

.page-about .section-head {
  margin-bottom: 2rem;
}

.page-about .section-kicker {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--orange);
  margin-bottom: 0.5rem;
}

.page-about .section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1.25;
  margin: 0;
  color: var(--ink);
}

.page-about .section-note {
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.7;
  margin-top: 0.5rem;
}

/* 我们是谁 */
.page-about .about-intro .intro-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.page-about .about-intro .intro-grid p {
  font-size: 1rem;
  line-height: 1.9;
  color: var(--ink);
  margin: 0;
}

.page-about .about-intro .intro-grid strong {
  color: var(--orange);
  font-weight: 700;
}

/* 时间轴 */
.page-about .about-milestones .section-head {
  margin-bottom: 2rem;
}

.page-about .timeline {
  border-left: 2px solid var(--navy);
  padding-left: 1.25rem;
  margin-bottom: 2rem;
}

.page-about .timeline-item {
  position: relative;
  padding: 0.75rem 0 1.5rem;
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: -1.8rem;
  top: 1.1rem;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--gold);
  border: 3px solid var(--cream);
  box-sizing: border-box;
  transition: background 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
}

.page-about .timeline-item.is-visible::before {
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 107, 0, 0.2);
  transform: scale(1.1);
}

.page-about .timeline-item summary {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1rem;
  cursor: pointer;
  transition: opacity 0.2s ease;
}

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

.page-about .timeline-item:hover summary {
  opacity: 0.85;
}

.page-about .timeline-year {
  font-family: var(--font-data);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: -0.05em;
}

.page-about .summary-line {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
}

.page-about .timeline-desc {
  margin-top: 0.5rem;
  padding-right: 0.5rem;
}

.page-about .timeline-desc p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .timeline-item[open] .timeline-desc {
  animation: about-fade-in 0.25s ease;
}

@keyframes about-fade-in {
  from {
    opacity: 0;
    transform: translateY(-4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-about .timeline-visual {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 12px;
  margin-top: 1rem;
  box-shadow: var(--shadow-soft);
}

/* 技术底座 */
.page-about .about-tech {
  background-color: var(--paper);
  border-radius: 16px;
  padding: 2rem 1.5rem;
  border: 1px solid var(--border);
}

.page-about .about-tech .tech-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.page-about .about-tech .tech-card {
  background: var(--cream);
  border: 1px solid var(--border);
  padding: 1.5rem;
  border-radius: 12px;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.page-about .about-tech .tech-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-soft);
}

.page-about .about-tech .tech-card h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  margin: 0 0 0.5rem;
  color: var(--navy);
}

.page-about .about-tech .tech-card p {
  font-family: var(--font-body);
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--muted);
  margin: 0;
}

.page-about .data-wave {
  margin-top: 1.5rem;
  border-radius: 12px;
  overflow: hidden;
  background: var(--cream);
  border: 1px solid var(--border);
  padding: 0.5rem;
}

.page-about .data-wave svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .data-wave .wave-fg {
  vector-effect: non-scaling-stroke;
}

/* 合规与认证 */
.page-about .about-compliance .badge-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.page-about .about-compliance .badge {
  background-color: var(--navy);
  color: var(--cream);
  border-radius: 50%;
  aspect-ratio: 1 / 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 1rem;
  box-shadow: var(--shadow-navy);
  border: 2px solid transparent;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
  cursor: default;
}

.page-about .about-compliance .badge:hover {
  transform: translateY(-6px) scale(1.03);
  box-shadow: 0 18px 36px rgba(10, 31, 68, 0.35);
  border-color: var(--gold);
}

.page-about .about-compliance .badge-num {
  font-family: var(--font-data);
  font-size: clamp(0.9rem, 3vw, 1.4rem);
  font-weight: 700;
  line-height: 1.2;
  color: var(--gold);
}

.page-about .about-compliance .badge-label {
  font-family: var(--font-body);
  font-size: clamp(0.6rem, 2vw, 0.8rem);
  line-height: 1.4;
  margin-top: 0.25rem;
  color: var(--cream);
  max-width: 8em;
}

.page-about .about-compliance .compliance-note {
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--muted);
  background: var(--paper);
  border-left: 3px solid var(--orange);
  padding: 0.75rem 1rem;
  border-radius: 0 8px 8px 0;
  margin: 1.5rem 0 0;
}

/* 团队文化 */
.page-about .about-team .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  align-items: center;
}

.page-about .about-team .team-copy p {
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--ink);
  margin: 0 0 1rem;
}

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

.page-about .about-team .team-grid img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 12px;
  box-shadow: var(--shadow-soft);
  border: 1px solid var(--border);
}

/* 愿景倒影 */
.page-about .about-vision {
  border-bottom: none;
  padding-bottom: 4rem;
}

.page-about .about-vision .vision-panel {
  background: var(--navy);
  color: var(--cream);
  padding: 2.5rem 1.75rem;
  border-radius: 20px;
  box-shadow: var(--shadow-navy);
  position: relative;
  overflow: hidden;
  text-align: center;
}

.page-about .about-vision .vision-panel::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -20%;
  width: 60%;
  height: 60%;
  background: radial-gradient(circle, rgba(255, 215, 0, 0.15) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.page-about .about-vision .section-title {
  color: var(--cream);
  margin-bottom: 1rem;
}

.page-about .about-vision .vision-copy {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.9;
  color: rgba(245, 240, 232, 0.85);
  max-width: 42em;
  margin: 0 auto 2rem;
}

.page-about .about-vision .vision-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
}

.page-about .about-vision .button--ghost {
  border-color: var(--cream);
  color: var(--cream);
}

.page-about .about-vision .button--ghost:hover {
  background-color: var(--cream);
  color: var(--navy);
}

/* 桌面端布局 */
@media (min-width: 900px) {
  .page-about .about-hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
    padding: 4rem 2rem 0;
    max-width: 1200px;
    margin: 0 auto;
  }

  .page-about .hero-copy {
    max-width: 100%;
  }

  .page-about .hero-copy h1 {
    font-size: 4.2rem;
  }

  .page-about .hero-media {
    margin: 0;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-soft);
  }

  .page-about .hero-media img {
    border-radius: 0;
    aspect-ratio: 16 / 10;
  }

  .page-about .page-shell {
    padding: 0 2rem;
  }

  .page-about section {
    padding: 4.5rem 0;
  }

  /* 时间轴左固定 */
  .page-about .about-milestones {
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-milestones .section-head {
    position: sticky;
    top: 2rem;
    margin-bottom: 0;
  }

  .page-about .about-milestones .timeline {
    margin-bottom: 0;
    padding-left: 2rem;
  }

  .page-about .timeline-item::before {
    left: -2.05rem;
    width: 16px;
    height: 16px;
  }

  .page-about .timeline-visual {
    grid-column: 1 / -1;
    margin-top: 2rem;
    aspect-ratio: 2 / 1;
  }

  /* 技术底座两列 */
  .page-about .about-tech {
    padding: 3rem;
  }

  .page-about .about-tech .tech-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }

  .page-about .data-wave {
    margin-top: 2rem;
  }

  /* 认证醒目大小 */
  .page-about .about-compliance .badge-grid {
    grid-template-columns: repeat(5, 1fr);
    gap: 2rem;
  }

  .page-about .about-compliance .badge {
    padding: 1.5rem;
  }

  /* 团队文化双栏 */
  .page-about .about-team .team-grid {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
  }

  .page-about .about-vision .vision-panel {
    padding: 4rem 3rem;
  }
}