/* ===== page-about 专属 CSS ===== */
.page-about {
  --about-hero-font: var(--font-heading);
  --about-chapter-gap: 64px;
  --about-chapter-padding: 32px 0;
  --about-marker-size: 48px;
}

.page-about .content-container {
  position: relative;
  z-index: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  padding-top: calc(var(--nav-height) + 24px);
}

/* 面包屑 */
.page-about .breadcrumb {
  font-family: var(--font-body);
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 48px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.page-about .breadcrumb a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus {
  color: var(--gold-bright);
}
.page-about .breadcrumb .sep {
  color: var(--border-color);
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--text-primary);
}

/* 首屏竖排标题 */
.page-about .hero-section {
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  justify-content: space-between;
  gap: 40px;
  margin-bottom: 80px;
}
.page-about .hero-text-block {
  max-width: 60%;
}
.page-about .hero-title {
  font-family: var(--about-hero-font);
  font-size: 64px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--text-primary);
  margin: 0 0 24px 0;
  letter-spacing: 0.05em;
  writing-mode: vertical-lr;
  text-orientation: upright;
  height: 360px;
  width: auto;
  background: linear-gradient(180deg, var(--primary) 0%, var(--bg-deep) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  padding: 16px 0;
}
.page-about .hero-subtitle {
  font-family: var(--font-body);
  font-size: 18px;
  color: var(--text-secondary);
  line-height: 1.6;
  max-width: 480px;
  border-left: 2px solid var(--accent);
  padding-left: 16px;
  margin-top: 16px;
}
.page-about .hero-decor {
  flex-shrink: 0;
  width: 400px;
  height: 600px;
  overflow: hidden;
  border: 1px solid var(--border-color);
}
.page-about .decor-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* 章节通用 */
.page-about .story-chapter {
  position: relative;
  padding: var(--about-chapter-padding);
  margin-bottom: var(--about-chapter-gap);
  border-bottom: 1px solid var(--border-color);
}
.page-about .story-chapter:last-of-type {
  border-bottom: none;
}
.page-about .chapter-marker {
  font-family: var(--font-accent);
  font-size: var(--about-marker-size);
  font-weight: 700;
  color: var(--accent);
  display: inline-block;
  width: 64px;
  height: 64px;
  line-height: 64px;
  text-align: center;
  border: 2px solid var(--accent);
  border-radius: 8px;
  margin-bottom: 16px;
  background: var(--bg-surface);
}
.page-about .chapter-icon {
  display: inline-block;
  width: 40px;
  height: 40px;
  object-fit: contain;
  margin-left: 16px;
  vertical-align: middle;
  opacity: 0.7;
}
.page-about .chapter-heading {
  font-family: var(--font-heading);
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 16px 0 24px;
  position: relative;
  display: inline-block;
}
.page-about .chapter-heading::after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 60%;
  height: 2px;
  background: var(--gold);
  border-radius: 1px;
}
.page-about .chapter-text {
  font-family: var(--font-body);
  font-size: 16px;
  color: var(--text-primary);
  line-height: 1.7;
  margin: 24px 0 32px;
  max-width: 720px;
}
.page-about .chapter-footer {
  margin-top: 24px;
}
.page-about .btn {
  display: inline-block;
  padding: 12px 28px;
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  background: var(--primary);
  border: 1px solid var(--accent);
  border-radius: 4px;
  text-decoration: none;
  transition: all var(--transition);
}
.page-about .btn:hover,
.page-about .btn:focus {
  background: var(--primary-dark);
  border-color: var(--gold-bright);
  color: var(--gold-bright);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(201, 168, 76, 0.3);
}

/* 过渡色带 */
.page-about .transition-band {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  margin: 0 auto 32px;
  opacity: 0.6;
  border-top: 1px solid var(--accent);
  border-bottom: 1px solid var(--accent);
}

/* 背景纹理（不可见但装饰） */
.page-about .bg-texture {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: -1;
  opacity: 0.15;
  pointer-events: none;
}

/* 移动端优先调整 */
@media (max-width: 768px) {
  .page-about .hero-section {
    flex-direction: column;
    gap: 24px;
  }
  .page-about .hero-text-block {
    max-width: 100%;
  }
  .page-about .hero-title {
    writing-mode: horizontal-tb;
    height: auto;
    width: auto;
    font-size: 42px;
    background: none;
    -webkit-text-fill-color: var(--text-primary);
    padding: 0;
  }
  .page-about .hero-subtitle {
    border-left: none;
    border-top: 2px solid var(--accent);
    padding-top: 12px;
    padding-left: 0;
  }
  .page-about .hero-decor {
    width: 100%;
    height: auto;
    max-height: 300px;
  }
  .page-about .chapter-marker {
    width: 48px;
    height: 48px;
    line-height: 48px;
    font-size: 24px;
  }
  .page-about .chapter-heading {
    font-size: 22px;
  }
  .page-about .chapter-text {
    font-size: 15px;
  }
  .page-about .transition-band {
    height: 40px;
  }
  .page-about .content-container {
    padding-left: 16px;
    padding-right: 16px;
  }
}