/* ===== page-about 品牌故事专属样式 ===== */
.page-about {
  --page-bg: var(--color-dark-blue);
  --page-accent: var(--color-neon-green);
  --page-gold: var(--color-gold);
  --page-white: var(--color-white);
  --page-silver: var(--color-silver);
  --page-violet: var(--color-violet);
  --page-deep: var(--color-deep-indigo);
  --page-shadow: 0 4px 20px rgba(0,0,0,0.5);
  --page-text-body: var(--color-white);
  --page-text-muted: var(--color-silver);

  display: flex;
  flex-direction: column;
  width: 100%;
  min-height: 100vh;
  background: var(--page-bg);
  color: var(--page-text-body);
  font-family: var(--font-body);
  font-size: var(--font-size-body);
  line-height: 1.7;
  position: relative;
}

/* 左侧追踪轨道 */
.page-about__track {
  display: none;
}

/* 画布容器 */
.page-about__canvas {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 1rem 3rem;
}

/* 面包屑 */
.page-about__breadcrumb {
  font-size: 0.8rem;
  color: var(--page-silver);
  margin: 0 0 0.5rem;
}
.page-about__breadcrumb a {
  color: var(--page-accent);
  text-decoration: none;
}
.page-about__breadcrumb a:hover {
  text-decoration: underline;
}

/* 首屏区域 */
.page-about__hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
  padding: 3rem 0 2rem;
  border-bottom: 2px solid var(--page-violet);
  margin-bottom: 3rem;
}
.page-about__hero-text {
  flex: 1;
}
.page-about__hero-heading {
  font-family: var(--font-heading);
  font-size: clamp(2.2rem, 7vw, 4rem);
  font-weight: 800;
  font-style: italic;
  line-height: 1.1;
  margin: 0 0 1rem;
  background: linear-gradient(135deg, var(--page-accent), var(--page-gold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.page-about__hero-sub {
  font-size: clamp(1rem, 2vw, 1.3rem);
  color: var(--page-silver);
  margin: 0;
}
.page-about__hero-symbol {
  flex-shrink: 0;
  width: clamp(180px, 40vw, 400px);
}
.page-about__hero-img {
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  box-shadow: var(--page-shadow);
  object-fit: cover;
}

/* 通用章节 */
.page-about__section {
  margin-bottom: 4rem;
  padding: 2rem 1.5rem;
  background: var(--page-deep);
  border-radius: 16px;
  box-shadow: 0 8px 30px rgba(0,0,0,0.4);
  position: relative;
  border-left: 4px solid var(--page-violet);
}
.page-about__section-heading {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  font-style: italic;
  color: var(--page-white);
  margin: 0 0 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.page-about__section-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.2rem;
  height: 2.2rem;
  background: var(--page-accent);
  color: var(--page-bg);
  border-radius: 8px;
  font-family: var(--font-data);
  font-size: 1.2rem;
  font-weight: 700;
  flex-shrink: 0;
}
.page-about__section-body {
  max-width: 800px;
}
.page-about__text {
  margin: 0 0 1rem;
  color: var(--page-text-body);
}
.page-about__highlight {
  color: var(--page-accent);
  font-weight: 700;
}

/* 服务范围卡片网格 */
.page-about__scope-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-bottom: 2rem;
}
.page-about__scope-card {
  background: var(--page-bg);
  padding: 1.5rem;
  border-radius: 12px;
  border: 1px solid rgba(57,255,20,0.15);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.page-about__scope-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(57,255,20,0.2);
}
.page-about__scope-icon {
  display: inline-block;
  margin-bottom: 0.8rem;
  font-size: 0.8rem;
  text-transform: uppercase;
}
.page-about__scope-title {
  font-family: var(--font-heading);
  font-size: clamp(1.2rem, 2.5vw, 1.6rem);
  font-weight: 700;
  font-style: italic;
  margin: 0 0 0.5rem;
  color: var(--page-gold);
}
.page-about__scope-desc {
  font-size: 0.95rem;
  color: var(--page-text-muted);
  margin: 0;
}
.page-about__scope-image-wrap {
  border-radius: 12px;
  overflow: hidden;
}
.page-about__scope-image {
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  object-fit: cover;
  display: block;
}

/* 联系我们区域 */
.page-about__contact-layout {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}
.page-about__contact-info {
  flex: 1;
}
.page-about__contact-dl {
  display: grid;
  grid-template-columns: 6rem 1fr;
  gap: 0.5rem 1rem;
  margin: 1.5rem 0;
}
.page-about__contact-dl dt {
  font-weight: 600;
  color: var(--page-accent);
  font-size: 0.9rem;
}
.page-about__contact-dl dd {
  margin: 0;
  color: var(--page-white);
  font-family: var(--font-data);
  font-size: 0.95rem;
}
.page-about__contact-note {
  font-size: 0.85rem;
  color: var(--page-silver);
  border-left: 3px solid var(--page-gold);
  padding-left: 1rem;
  margin: 1rem 0;
}
.page-about__contact-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 1.5rem;
}
.page-about__contact-actions .cta-btn {
  background: var(--page-accent);
  color: var(--page-bg);
  padding: 0.6rem 1.5rem;
  border-radius: 30px;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.3s ease, transform 0.2s;
}
.page-about__contact-actions .cta-btn:hover {
  background: var(--page-gold);
  color: var(--page-bg);
  transform: scale(1.05);
}
.page-about__link {
  display: inline-flex;
  align-items: center;
  color: var(--page-accent);
  text-decoration: underline;
  font-weight: 500;
}
.page-about__link:hover {
  color: var(--page-gold);
}

.page-about__contact-image {
  flex-shrink: 0;
  width: 100%;
  max-width: 300px;
  border-radius: 12px;
  overflow: hidden;
}
.page-about__contact-img {
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 12px;
  display: block;
}

/* 返回顶部按钮 (共享类, 只在这里微调位置) */
.page-about .back-to-top {
  --btm-size: 48px;
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: var(--btm-size);
  height: var(--btm-size);
  border-radius: 50%;
  background: var(--color-neon-green);
  color: var(--color-dark-blue);
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 14px rgba(57,255,20,0.4);
  transition: opacity 0.3s ease, transform 0.2s;
  opacity: 0;
  pointer-events: none;
  z-index: 999;
}
.page-about .back-to-top[data-visible] {
  opacity: 1;
  pointer-events: auto;
}
.page-about .back-to-top:hover {
  transform: scale(1.1);
}

/* ===== 桌面端 ≥ 1024px ===== */
@media (min-width: 1024px) {
  .page-about {
    flex-direction: row;
  }
  .page-about__track {
    display: block;
    flex: 0 0 8%;
    max-width: 8%;
    position: sticky;
    top: 0;
    height: 100vh;
    background: var(--color-violet);
    border-right: 2px solid var(--color-deep-indigo);
    z-index: 10;
  }
  .page-about__track-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    padding: 2rem 0;
  }
  .page-about__chapter-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 2rem;
  }
  .page-about__chapter-link {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-size: 0.9rem;
    font-weight: 600;
    color: rgba(245,245,245,0.6);
    text-decoration: none;
    letter-spacing: 0.1em;
    transition: color 0.3s ease, opacity 0.3s;
    opacity: 0.6;
  }
  .page-about__chapter-link[data-active] {
    color: var(--color-neon-green);
    opacity: 1;
  }
  .page-about__chapter-link:hover {
    color: var(--color-gold);
    opacity: 1;
  }

  .page-about__canvas {
    flex: 1;
    max-width: 92%;
    padding: 2rem 3rem 4rem;
  }

  .page-about__hero {
    flex-direction: row;
    align-items: flex-start;
    justify-content: space-between;
    gap: 3rem;
    padding: 4rem 0 2rem;
  }
  .page-about__scope-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about__contact-layout {
    flex-direction: row;
    align-items: flex-start;
    gap: 3rem;
  }
  .page-about__contact-image {
    max-width: 280px;
  }
}

/* ===== 平板 768–1023px ===== */
@media (min-width: 768px) and (max-width: 1023px) {
  .page-about__canvas {
    padding: 1.5rem 2rem 3rem;
  }
  .page-about__scope-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about__contact-layout {
    flex-direction: row;
    gap: 2rem;
  }
  .page-about__contact-image {
    max-width: 240px;
  }
}
</style>