/* =============================================
   page-about 专属样式
   作用域限定，移动端优先
   ============================================= */
.page-about {
  --about-gold: #D4AF37;
  --about-card-bg: #F5F0EB;
  --about-text-dark: #2D2D2D;
  --about-text-light: #8C8C8C;
  --about-border: #4A4A4A;
  --about-primary: #0A192F;
  --about-cta: #FF6B35;
  --about-divider-height: 2px;
  --about-anchor-top: 80px;
  --about-section-gap: 2.5rem;
  --about-figure-radius: 4px;

  position: relative;
  padding: 0 var(--space-md, 1rem) var(--space-xl, 4rem);
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
  background-color: transparent;
  color: var(--about-text-dark);
  font-family: var(--font-body, 'Noto Sans SC', sans-serif);
}

/* ---------- 侧边锚点导航 ---------- */
.about-anchor-nav {
  position: sticky;
  top: calc(var(--header-height, 64px) + var(--space-sm, 0.5rem));
  z-index: 10;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm, 0.5rem) var(--space-md, 1rem);
  padding: var(--space-sm, 0.5rem) 0;
  margin-bottom: var(--space-lg, 2rem);
  border-bottom: 1px solid var(--about-gold);
  background-color: var(--about-primary);
}

.anchor-link {
  font-size: var(--fs-small, 0.75rem);
  font-weight: var(--fw-normal, 300);
  color: var(--about-gold);
  text-decoration: none;
  letter-spacing: 0.04em;
  padding: var(--space-xs, 0.25rem) var(--space-sm, 0.5rem);
  border: 1px solid transparent;
  transition: border-color var(--transition-fast, 0.2s ease), color var(--transition-fast, 0.2s ease);
  line-height: 1.6;
}

.anchor-link:hover,
.anchor-link:focus {
  border-color: var(--about-gold);
  color: var(--color-white, #FFFFFF);
}

/* ---------- 首屏标题区 ---------- */
.about-hero {
  margin-bottom: var(--space-xl, 4rem);
  padding-top: var(--space-lg, 2rem);
}

.about-hero-title {
  font-family: var(--font-heading, 'Noto Sans SC', sans-serif);
  font-weight: var(--fw-bold, 900);
  font-size: clamp(1.8rem, 6vw, 3.2rem);
  color: var(--about-gold);
  margin: 0 0 var(--space-sm, 0.5rem);
  line-height: 1.1;
  letter-spacing: 0.02em;
}

.about-hero-subtitle {
  font-size: clamp(0.95rem, 2vw, 1.25rem);
  font-weight: var(--fw-light, 100);
  color: var(--color-white, #FFFFFF);
  margin: 0;
  padding-left: var(--space-md, 1rem);
  border-left: var(--about-divider-height) solid var(--about-gold);
  max-width: 32em;
  line-height: 1.6;
}

/* ---------- 章节通用 ---------- */
.about-section {
  margin-bottom: var(--about-section-gap);
}

.section-inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg, 2rem);
}

.section-number {
  display: inline-block;
  font-size: var(--fs-small, 0.75rem);
  font-weight: var(--fw-bold, 900);
  color: var(--about-gold);
  letter-spacing: 0.1em;
  margin-bottom: var(--space-xs, 0.25rem);
  opacity: 0.7;
}

.section-heading {
  font-family: var(--font-heading, 'Noto Sans SC', sans-serif);
  font-weight: var(--fw-bold, 900);
  font-size: clamp(1.35rem, 3.5vw, 2rem);
  color: var(--about-gold);
  margin: 0 0 var(--space-md, 1rem);
  line-height: 1.2;
}

.section-body {
  font-size: var(--fs-body, 1rem);
  font-weight: var(--fw-normal, 300);
  color: var(--about-text-dark);
  line-height: 1.7;
  margin: 0 0 var(--space-md, 1rem);
  max-width: 42em;
}

.section-body:last-of-type {
  margin-bottom: 0;
}

/* ---------- 高亮列表（改版亮点） ---------- */
.highlight-list {
  list-style: none;
  margin: var(--space-md, 1rem) 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm, 0.5rem);
}

.highlight-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm, 0.5rem);
  font-size: var(--fs-body, 1rem);
  font-weight: var(--fw-normal, 300);
  color: var(--about-text-dark);
  line-height: 1.6;
}

.highlight-icon {
  color: var(--about-gold);
  font-size: 0.9em;
  flex-shrink: 0;
  margin-top: 0.1em;
}

/* ---------- 图片 ---------- */
.section-figure {
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm, 0.5rem);
}

.figure-img {
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--about-figure-radius);
  background-color: var(--about-card-bg);
  box-shadow: 0 2px 12px rgba(0,0,0,0.08);
  display: block;
}

.figure-img-small {
  object-fit: contain;
  background-color: transparent;
  box-shadow: none;
}

.figure-caption {
  font-size: var(--fs-small, 0.75rem);
  font-weight: var(--fw-light, 100);
  color: var(--about-text-light);
  text-align: center;
  letter-spacing: 0.04em;
}

/* ---------- 金色分割线 ---------- */
.about-divider {
  border: none;
  height: var(--about-divider-height);
  background: linear-gradient(90deg, var(--about-gold) 0%, var(--about-gold) 60%, transparent 100%);
  margin: var(--space-lg, 2rem) 0;
  width: 100%;
}

/* ---------- 底部信任声明 ---------- */
.about-trust {
  margin-top: var(--space-xl, 4rem);
  padding: var(--space-lg, 2rem) var(--space-md, 1rem);
  background-color: var(--about-card-bg);
  border-left: 4px solid var(--about-gold);
  display: flex;
  flex-direction: column;
  gap: var(--space-md, 1rem);
}

.trust-text {
  font-size: var(--fs-body, 1rem);
  font-weight: var(--fw-normal, 300);
  color: var(--about-text-dark);
  line-height: 1.7;
  margin: 0;
  max-width: 36em;
}

.trust-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm, 0.5rem) var(--space-md, 1rem);
}

/* ---------- 按钮重写 ---------- */
.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.5rem;
  font-size: var(--fs-small, 0.75rem);
  font-weight: var(--fw-bold, 900);
  text-decoration: none;
  border: 2px solid transparent;
  transition: background-color var(--transition-fast, 0.2s ease), color var(--transition-fast, 0.2s ease), border-color var(--transition-fast, 0.2s ease);
  cursor: pointer;
  line-height: 1.4;
  letter-spacing: 0.04em;
}

.page-about .btn-primary {
  background-color: var(--about-cta);
  color: var(--color-white, #FFFFFF);
  border-color: var(--about-cta);
}

.page-about .btn-primary:hover,
.page-about .btn-primary:focus {
  background-color: var(--about-gold);
  border-color: var(--about-gold);
  color: var(--about-primary);
}

.page-about .btn-outline {
  background-color: transparent;
  color: var(--about-gold);
  border-color: var(--about-gold);
}

.page-about .btn-outline:hover,
.page-about .btn-outline:focus {
  background-color: var(--about-gold);
  color: var(--about-primary);
}

/* ---------- 内联链接 ---------- */
.about-link {
  color: var(--about-cta);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-fast, 0.2s ease), color var(--transition-fast, 0.2s ease);
}

.about-link:hover,
.about-link:focus {
  border-bottom-color: var(--about-cta);
  color: var(--about-gold);
}

/* =============================================
   桌面端媒体查询 (min-width: 768px)
   ============================================= */
@media (min-width: 768px) {
  .page-about {
    padding: 0 var(--space-xl, 4rem) var(--space-xl, 4rem);
  }

  .about-anchor-nav {
    top: calc(var(--header-height, 64px) + var(--space-md, 1rem));
    padding: var(--space-md, 1rem) 0;
    gap: var(--space-md, 1rem) var(--space-lg, 2rem);
  }

  .anchor-link {
    font-size: var(--fs-body, 1rem);
    padding: var(--space-xs, 0.25rem) var(--space-md, 1rem);
  }

  .about-hero {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-lg, 2rem);
    align-items: end;
  }

  .about-hero-title {
    grid-column: 1 / 2;
    text-align: right;
  }

  .about-hero-subtitle {
    grid-column: 2 / 3;
    padding-left: var(--space-lg, 2rem);
    margin-bottom: 0.2em;
  }

  .section-inner {
    flex-direction: row;
    align-items: center;
    gap: var(--space-xl, 4rem);
  }

  .section-inner-reverse {
    flex-direction: row-reverse;
  }

  .section-text {
    flex: 1 1 55%;
    max-width: 32em;
  }

  .section-figure {
    flex: 0 0 auto;
    align-items: flex-start;
  }

  .section-figure-small {
    align-items: center;
    flex: 0 0 auto;
  }

  .figure-img {
    max-width: 100%;
    height: auto;
  }

  .about-section {
    margin-bottom: var(--space-xl, 4rem);
  }

  .about-divider {
    margin: var(--space-xl, 4rem) 0;
    width: 80%;
  }

  .about-trust {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-lg, 2rem) var(--space-xl, 4rem);
  }

  .trust-text {
    margin: 0;
    flex: 1 1 auto;
  }

  .trust-actions {
    flex: 0 0 auto;
  }
}

/* =============================================
   大桌面端微调 (min-width: 1024px)
   ============================================= */
@media (min-width: 1024px) {
  .page-about {
    padding: 0 6rem var(--space-xl, 4rem);
  }

  .section-text {
    flex: 1 1 50%;
    max-width: 36em;
  }

  .section-figure {
    flex: 0 0 35%;
  }

  .about-hero-title {
    font-size: clamp(2.2rem, 5vw, 3.6rem);
  }
}

/* ---------- 滚动渐入动画 (渐进增强) ---------- */
@media (prefers-reduced-motion: no-preference) {
  .about-section {
    opacity: 0;
    transform: translateY(24px);
    animation: aboutFadeIn 0.6s ease forwards;
  }

  .about-section:nth-of-type(1) { animation-delay: 0.1s; }
  .about-section:nth-of-type(2) { animation-delay: 0.2s; }
  .about-section:nth-of-type(3) { animation-delay: 0.3s; }

  @keyframes aboutFadeIn {
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  .about-hero {
    opacity: 0;
    animation: aboutFadeIn 0.7s ease 0.05s forwards;
  }

  .about-trust {
    opacity: 0;
    animation: aboutFadeIn 0.6s ease 0.4s forwards;
  }
}
</main>

/* 页面专属样式已内联在 MAIN_HTML 上方的 <style> 块中 */