/* ===== 品牌档案页面专属样式 ===== */
.page-about {
  --accent-red: #E63946;
  --accent-blue: #1D3557;
  --accent-gold: #F4A261;
  --dark-bg: #0B0C10;
  --dark-surface: #1F2833;
  --light-text: #FFFFFF;
  --dim-text: #B0B0B0;
  --card-border: #3E4A56;
  --heading-font: Impact, 'Arial Black', sans-serif;
  --body-font: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --mono-font: 'Courier New', Consolas, monospace;

  display: block;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 16px 48px;
  color: var(--light-text);
  font-family: var(--body-font);
  line-height: 1.65;
}

/* 页面上下文（面包屑） */
.page-about .page-context {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 16px 0 8px;
  font-size: 0.85rem;
  color: var(--dim-text);
  border-bottom: 1px solid rgba(255,255,255,0.06);
  margin-bottom: 32px;
}
.page-about .context-link {
  color: var(--accent-gold);
  text-decoration: none;
  transition: color 0.2s;
}
.page-about .context-link:hover {
  color: var(--light-text);
}
.page-about .context-sep {
  color: var(--card-border);
  font-family: var(--mono-font);
}
.page-about .context-current {
  color: var(--light-text);
  font-weight: 600;
}

/* 章节通用 */
.page-about .about-chapter {
  margin-bottom: 56px;
}
.page-about .chapter-body {
  display: flex;
  flex-direction: column;
  gap: 28px;
}
.page-about .chapter-text {
  flex: 1 1 0%;
}
.page-about .chapter-title {
  font-family: var(--heading-font);
  font-size: 2.4rem;
  line-height: 1.15;
  margin: 0 0 8px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--light-text);
}
.page-about .chapter-subtitle {
  font-size: 1.05rem;
  color: var(--dim-text);
  max-width: 660px;
  margin: 0 0 24px;
  line-height: 1.6;
}

/* 章节标题（h2） */
.page-about .section-heading {
  font-family: var(--heading-font);
  font-size: 1.6rem;
  line-height: 1.2;
  margin: 0 0 20px;
  padding-left: 16px;
  border-left: 6px solid var(--accent-red);
  text-transform: uppercase;
  letter-spacing: 0.01em;
}
.page-about .section-heading[data-accent="red"] {
  border-left-color: var(--accent-red);
}
.page-about .section-heading[data-accent="blue"] {
  border-left-color: var(--accent-blue);
}
.page-about .section-heading[data-accent="gold"] {
  border-left-color: var(--accent-gold);
}

/* 正文排版 */
.page-about .text-large {
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--light-text);
  margin-bottom: 16px;
  line-height: 1.6;
}
.page-about .chapter-text p {
  margin: 0 0 14px;
  color: var(--dim-text);
  max-width: 680px;
}
.page-about .chapter-text p:last-child {
  margin-bottom: 0;
}

/* 图片 */
.page-about .chapter-image {
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid var(--card-border);
  display: block;
  margin-top: 8px;
}
.page-about .about-chapter:first-of-type .chapter-image {
  border: none;
  border-radius: 12px;
}

/* 引用区块 */
.page-about .about-quote {
  margin: 0 0 56px;
  padding: 32px 40px;
  background: var(--dark-surface);
  border-left: 6px solid var(--accent-gold);
  border-radius: 8px;
  position: relative;
}
.page-about .about-quote p {
  font-size: 1.25rem;
  font-style: italic;
  line-height: 1.6;
  color: var(--light-text);
  margin: 0 0 12px;
  font-family: Georgia, 'Times New Roman', serif;
}
.page-about .about-quote cite {
  font-size: 0.9rem;
  color: var(--accent-gold);
  font-style: normal;
  display: block;
  text-align: right;
}
.page-about .about-quote::before {
  content: "\201C";
  font-size: 4rem;
  line-height: 1;
  color: var(--accent-gold);
  opacity: 0.25;
  position: absolute;
  top: 12px;
  left: 12px;
  font-family: Georgia, serif;
  pointer-events: none;
}

/* 服务网格 */
.page-about .services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin: 12px 0 20px;
}
.page-about .service-card {
  background: var(--dark-surface);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 24px 20px;
  transition: border-color 0.25s, transform 0.25s;
  position: relative;
}
.page-about .service-card[data-accent="red"] {
  border-top: 4px solid var(--accent-red);
}
.page-about .service-card[data-accent="blue"] {
  border-top: 4px solid var(--accent-blue);
}
.page-about .service-card[data-accent="gold"] {
  border-top: 4px solid var(--accent-gold);
}
.page-about .service-card:hover {
  border-color: rgba(255,255,255,0.15);
  transform: translateY(-3px);
}
.page-about .service-icon {
  font-family: var(--mono-font);
  font-size: 0.85rem;
  color: var(--accent-gold);
  display: block;
  margin-bottom: 10px;
  letter-spacing: 0.08em;
}
.page-about .service-title {
  font-family: var(--heading-font);
  font-size: 1.1rem;
  margin: 0 0 8px;
  color: var(--light-text);
  text-transform: uppercase;
  letter-spacing: 0.01em;
}
.page-about .service-desc {
  font-size: 0.92rem;
  color: var(--dim-text);
  line-height: 1.55;
  margin: 0 0 14px;
}
.page-about .service-link {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-gold);
  text-decoration: none;
  transition: color 0.2s;
}
.page-about .service-link:hover {
  color: var(--light-text);
}

/* 用户群体章节文字与图片反向排列（桌面端） */
.page-about .chapter-body.reverse {
  flex-direction: column;
}

/* 内链区域 */
.page-about .about-links {
  margin-top: 24px;
  padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,0.06);
}
.page-about .about-links .section-heading {
  margin-bottom: 24px;
}
.page-about .links-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.page-about .link-card {
  display: flex;
  flex-direction: column;
  background: var(--dark-surface);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 18px 20px;
  text-decoration: none;
  transition: border-color 0.25s, background 0.25s;
}
.page-about .link-card:hover {
  border-color: var(--accent-gold);
  background: rgba(244,162,97,0.06);
}
.page-about .link-label {
  font-family: var(--heading-font);
  font-size: 1rem;
  color: var(--light-text);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin-bottom: 4px;
}
.page-about .link-desc {
  font-size: 0.82rem;
  color: var(--dim-text);
}

/* ===== 滚动渐入支持（渐进增强） ===== */
.page-about [data-section="fade"] {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
@media (prefers-reduced-motion: no-preference) {
  .page-about [data-section="fade"] {
    opacity: 0;
    transform: translateY(24px);
  }
  .page-about [data-section="fade"].visible {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ===== 桌面端适配（≥768px） ===== */
@media (min-width: 768px) {
  .page-about {
    padding: 0 32px 64px;
  }
  .page-about .page-context {
    padding-top: 24px;
    margin-bottom: 40px;
  }
  .page-about .chapter-title {
    font-size: 3.2rem;
  }
  .page-about .chapter-subtitle {
    font-size: 1.15rem;
  }
  .page-about .chapter-body {
    flex-direction: row;
    align-items: flex-start;
    gap: 40px;
  }
  .page-about .chapter-body .chapter-text {
    flex: 1 1 55%;
  }
  .page-about .chapter-body .chapter-image {
    flex: 1 1 40%;
    margin-top: 0;
  }
  .page-about .chapter-body.reverse {
    flex-direction: row-reverse;
  }

  .page-about .section-heading {
    font-size: 1.8rem;
    padding-left: 20px;
    border-left-width: 8px;
  }

  .page-about .about-quote {
    padding: 40px 56px;
    margin: 0 0 64px;
  }
  .page-about .about-quote p {
    font-size: 1.4rem;
  }

  /* 服务网格：四列 */
  .page-about .services-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }

  /* 内链网格 */
  .page-about .links-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
  }
  .page-about .service-card {
    padding: 28px 24px;
  }
}

/* ===== 大屏适配（≥1024px） ===== */
@media (min-width: 1024px) {
  .page-about {
    padding: 0 48px 80px;
  }
  .page-about .chapter-title {
    font-size: 3.8rem;
  }
  .page-about .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .chapter-body {
    gap: 56px;
  }
  .page-about .section-heading {
    font-size: 2rem;
  }
}