.page-about {
  --panel-gap: 2rem;
  --timeline-node-width: 260px;
  margin: 0;
  padding: 0;
  font-family: var(--font-body);
  color: var(--text-primary);
  background: var(--neutral-light);
}
.page-about .breadcrumb {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 1rem 0;
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.page-about .breadcrumb a {
  color: var(--secondary);
  text-decoration: none;
}
.page-about .breadcrumb a:hover {
  text-decoration: underline;
}
.page-about .breadcrumb .sep {
  margin: 0 0.4rem;
}
.page-about .page-title {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  line-height: 1.1;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin: 0 0 1rem;
  color: var(--text-primary);
}
.page-about .section-title {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  letter-spacing: 1px;
  margin: 0 0 1.5rem;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.page-about .section-title .mono {
  font-size: 1rem;
  color: var(--secondary);
  background: var(--primary);
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  display: inline-block;
}
.page-about .mono {
  font-family: var(--font-mono);
}
.page-about .btn-cta {
  display: inline-block;
  background: var(--gradient-main);
  border: var(--border-thick) solid var(--secondary);
  color: var(--text-primary);
  padding: 0.75rem 2rem;
  font-family: var(--font-heading);
  font-weight: bold;
  letter-spacing: 1px;
  text-transform: uppercase;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.25s, box-shadow 0.25s;
}
.page-about .btn-cta:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(0,229,255,0.5);
}
.page-about .golden-edge {
  border: var(--border-thick) solid var(--secondary);
  box-shadow: var(--shadow-heavy);
}

/* 面板通用 */
.page-about .panel-overview,
.page-about .panel-timeline,
.page-about .panel-data {
  max-width: 1200px;
  margin: var(--panel-gap) auto;
  padding: 1.5rem 1rem;
  position: relative;
}
.page-about .panel-overview {
  background: linear-gradient(135deg, var(--primary) 0%, #2a004f 100%);
  border: var(--border-thick) solid var(--secondary);
  box-shadow: var(--shadow-heavy);
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  align-items: center;
}
.page-about .panel-overview .panel-text {
  flex: 1 1 45%;
  min-width: 280px;
}
.page-about .panel-overview .panel-desc {
  font-size: 1.05rem;
  line-height: 1.6;
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}
.page-about .panel-overview .panel-visual {
  flex: 1 1 45%;
  min-width: 280px;
  position: relative;
  overflow: hidden;
  border-radius: 4px;
}
.page-about .panel-overview .panel-bg-img {
  width: 100%;
  height: auto;
  max-width: 100%;
  display: block;
  object-fit: cover;
  min-height: 200px;
}
.page-about .panel-overview .panel-visual::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom right, transparent 30%, rgba(74,0,128,0.4));
  pointer-events: none;
}

/* 時間線面板 */
.page-about .panel-timeline {
  background: var(--neutral-light);
  border: var(--border-thick) solid var(--primary);
  box-shadow: var(--shadow-heavy);
}
.page-about .timeline-rail {
  position: relative;
  padding-left: 2.5rem;
}
.page-about .timeline-line {
  position: absolute;
  left: 0.8rem;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--gradient-main);
  border-radius: 2px;
}
.page-about .timeline-nodes {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.page-about .timeline-node {
  position: relative;
  padding: 0.5rem 0 0.5rem 1rem;
  margin-bottom: 0;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}
.page-about .timeline-node:not(:last-child)::after {
  content: '';
  position: absolute;
  left: -1.7rem;
  top: 2.2rem;
  bottom: 0;
  width: 4px;
  background: var(--gradient-alt);
  opacity: 0.3;
}
.page-about .node-marker {
  flex-shrink: 0;
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 0.2rem;
}
.page-about .node-marker svg {
  width: 1.5rem;
  height: 1.5rem;
}
.page-about .node-detail {
  flex: 1;
  background: #fff;
  border: 2px solid var(--primary);
  padding: 0.8rem 1rem;
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}
.page-about .node-detail[open] {
  border-color: var(--secondary);
}
.page-about .node-header {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  cursor: pointer;
  list-style: none;
}
.page-about .node-header::-webkit-details-marker {
  display: none;
}
.page-about .node-header:hover {
  color: var(--secondary);
}
.page-about .node-date {
  font-size: 0.85rem;
  color: var(--primary);
  font-weight: bold;
  white-space: nowrap;
}
.page-about .node-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  letter-spacing: 1px;
  color: var(--primary);
}
.page-about .node-body {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid rgba(74,0,128,0.15);
  font-size: 0.95rem;
  line-height: 1.5;
  color: #222;
}
.page-about .node-image {
  margin-top: 1rem;
  max-width: 220px;
}
.page-about .node-image img {
  width: 100%;
  height: auto;
  max-width: 100%;
  display: block;
  border: 2px solid var(--secondary);
}

/* 核心數據透明面板 */
.page-about .panel-data {
  background: linear-gradient(135deg, var(--neutral-dark) 0%, #2a1a3a 100%);
  border: var(--border-thick) solid var(--secondary);
  box-shadow: var(--shadow-heavy);
}
.page-about .panel-data .section-title {
  color: var(--text-primary);
}
.page-about .data-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-bottom: 2rem;
}
.page-about .data-card {
  background: var(--neutral-light);
  padding: 1.5rem;
  border: 3px solid var(--secondary);
  box-shadow: 0 8px 20px rgba(0,0,0,0.3);
  transition: transform 0.3s, box-shadow 0.3s;
}
.page-about .data-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 30px rgba(255,215,0,0.3);
}
.page-about .data-card-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  letter-spacing: 1px;
  color: var(--primary);
  margin: 0 0 0.5rem;
}
.page-about .data-value {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: bold;
  color: var(--secondary);
  margin: 0 0 0.5rem;
}
.page-about .data-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}
.page-about .data-card-wide {
  grid-column: 1 / -1;
}
.page-about .data-chart {
  max-width: 700px;
  margin: 0 auto;
}
.page-about .data-chart img {
  width: 100%;
  height: auto;
  max-width: 100%;
  display: block;
  border: 3px solid var(--primary);
}

/* 響應式：桌面端 */
@media (min-width: 768px) {
  .page-about .panel-overview,
  .page-about .panel-timeline,
  .page-about .panel-data {
    padding: 2.5rem 2rem;
  }
  .page-about .page-title {
    font-size: 3rem;
  }
  .page-about .section-title {
    font-size: 2.2rem;
  }
  .page-about .data-grid {
    grid-template-columns: 1fr 1fr;
  }
  .page-about .data-card-wide {
    grid-column: span 2;
  }
  .page-about .timeline-rail {
    padding-left: 3.5rem;
  }
  .page-about .timeline-line {
    left: 1.2rem;
  }
  .page-about .node-marker svg {
    width: 2rem;
    height: 2rem;
  }
  .page-about .node-detail {
    padding: 1rem 1.5rem;
  }
}
/* 防止溢出 */
.page-about img {
  max-width: 100%;
  height: auto;
}
.page-about * {
  box-sizing: border-box;
}