.page-about {
  --about-hero-min-h: 80vh;
  --about-gap: 2rem;
  --about-note-w: 200px;
  --about-image-radius: 8px;
  --about-card-padding: 1.5rem;
}
/* 面包屑 */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary, #b0b8c4);
  margin-bottom: 1rem;
}
.page-about .breadcrumb a {
  color: var(--primary-accent, #d4a745);
  text-decoration: none;
}
.page-about .breadcrumb a:hover {
  text-decoration: underline;
}
/* 框景首屏 */
.page-about .hero-frame {
  min-height: var(--about-hero-min-h);
  display: flex;
  align-items: center;
  position: relative;
}
.page-about .frame-window {
  width: 100%;
  border: 2px solid var(--primary-accent, #d4a745);
  border-radius: 12px;
  padding: 2rem;
  position: relative;
  background: var(--card-bg, #1c2e4a);
  box-shadow: 0 0 0 1px var(--tertiary-accent, #c0c0c0) inset;
}
.page-about .frame-border {
  position: absolute;
  top: -1px; left: -1px; right: -1px; bottom: -1px;
  pointer-events: none;
}
.page-about .scale-mark {
  position: absolute;
  width: 8px; height: 8px;
  border: 1px solid var(--tertiary-accent, #c0c0c0);
  background: var(--primary-bg, #0a1628);
}
.page-about .scale-mark:nth-child(1) { top: -4px; left: -4px; }
.page-about .scale-mark:nth-child(2) { top: -4px; right: -4px; }
.page-about .scale-mark:nth-child(3) { bottom: -4px; left: -4px; }
.page-about .scale-mark:nth-child(4) { bottom: -4px; right: -4px; }
.page-about .hero-layout {
  display: flex;
  flex-wrap: wrap;
  gap: var(--about-gap);
  position: relative;
  z-index: 1;
}
.page-about .hero-layout .note-column {
  flex: 0 0 var(--about-note-w);
  min-width: 120px;
}
.page-about .hero-layout .content-column {
  flex: 1;
  min-width: 280px;
}
.page-about .hero-quote {
  font-size: 1.25rem;
  font-weight: bold;
  color: var(--primary-accent, #d4a745);
  margin-top: 0.5rem;
  background: linear-gradient(135deg, var(--gold-start, #d4a745), var(--gold-end, #f0c040));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.page-about .page-title {
  font-size: 2.25rem;
  font-weight: bold;
  margin: 0 0 0.25rem;
  background: linear-gradient(135deg, var(--gold-start, #d4a745), var(--gold-end, #f0c040));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.page-about .page-subtitle {
  font-size: 1rem;
  color: var(--text-secondary, #b0b8c4);
  margin-bottom: 1rem;
}
.page-about .hero-image {
  width: 100%;
  height: auto;
  max-width: 800px;
  border-radius: var(--about-image-radius);
  margin-top: 1.5rem;
  object-fit: cover;
  transition: transform 0.3s ease;
}
.page-about .hero-image:hover {
  transform: scale(1.02);
}
/* 功能区块通用 */
.page-about .feature-section {
  display: flex;
  flex-wrap: wrap;
  gap: var(--about-gap);
  align-items: flex-start;
  margin-top: 3rem;
  padding: var(--about-card-padding);
  background: var(--card-bg, #1c2e4a);
  border-radius: 12px;
  border-left: 4px solid var(--primary-accent, #d4a745);
}
.page-about .feature-section .note-column {
  flex: 0 0 var(--about-note-w);
  min-width: 120px;
}
.page-about .feature-section .content-column {
  flex: 1;
  min-width: 280px;
}
.page-about .feature-section .text-mono {
  font-family: var(--font-mono, ui-monospace, monospace);
  color: var(--tertiary-accent, #c0c0c0);
  font-size: 0.875rem;
  margin-bottom: 0.5rem;
}
.page-about .version-badge,
.page-about .synced-icon,
.page-about .support-icon {
  font-weight: bold;
  color: var(--primary-accent, #d4a745);
  font-size: 1.1rem;
}
.page-about .feature-section h2 {
  font-size: 1.75rem;
  margin: 0 0 0.75rem;
  background: linear-gradient(135deg, var(--gold-start, #d4a745), var(--gold-end, #f0c040));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.page-about .feature-section p {
  color: var(--text-primary, #ffffff);
  line-height: 1.6;
  margin-bottom: 1rem;
}
.page-about .feature-section a {
  color: var(--primary-accent, #d4a745);
  text-decoration: underline;
}
.page-about .feature-section a:hover {
  color: var(--nav-hover, #f0c040);
}
.page-about .feature-image {
  width: 100%;
  height: auto;
  max-width: 600px;
  border-radius: var(--about-image-radius);
  object-fit: cover;
  transition: transform 0.3s ease;
}
.page-about .feature-image.feature-left {
  float: left;
  margin-right: 1rem;
  margin-bottom: 1rem;
}
.page-about .feature-image.feature-right {
  float: right;
  margin-left: 1rem;
  margin-bottom: 1rem;
}
.page-about .feature-image:hover {
  transform: scale(1.02);
}
/* 滚动显现交互 */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}
/* 清浮动 */
.page-about .content-column::after {
  content: "";
  display: block;
  clear: both;
}
/* 移动端优先 */
@media (max-width: 768px) {
  .page-about .hero-frame {
    min-height: auto;
    padding: 1rem 0;
  }
  .page-about .frame-window {
    padding: 1rem;
  }
  .page-about .hero-layout {
    flex-direction: column;
  }
  .page-about .hero-layout .note-column,
  .page-about .feature-section .note-column {
    flex-basis: 100%;
    margin-bottom: 0.5rem;
  }
  .page-about .feature-section {
    flex-direction: column;
    padding: 1rem;
  }
  .page-about .feature-image.feature-left,
  .page-about .feature-image.feature-right {
    float: none;
    margin: 1rem 0 0;
    max-width: 100%;
  }
  .page-about .page-title {
    font-size: 1.75rem;
  }
  .page-about .feature-section h2 {
    font-size: 1.4rem;
  }
}
@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .page-about .hero-image,
  .page-about .feature-image {
    transition: none;
  }
  .page-about .hero-image:hover,
  .page-about .feature-image:hover {
    transform: none;
  }
}