/* 品牌介绍页专属样式 - 作用域 .page-about */
.page-about {
  --about-bg-alt: #0c1e3a;
  --about-border-glow: 0 0 20px rgba(0, 255, 135, 0.08);
  --about-card-border: 3px solid var(--color-border);
  --about-diagonal-angle: -8deg;

  display: block;
  width: 100%;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.6;
}

.page-about__inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
}

/* 面包屑 */
.page-about__breadcrumb {
  margin-top: 24px;
  padding: 12px 0;
  font-size: 0.9rem;
  color: var(--color-text-muted);
  border-top: 1px solid var(--color-border);
}

/* 每个章节成为独立画板 */
.page-about__section {
  position: relative;
  padding: 64px 0 48px;
  border-bottom: 2px solid var(--color-border);
  perspective: 1200px;
}

.page-about__section:last-of-type {
  border-bottom: none;
}

/* 首屏背景图 */
.page-about__section--mission {
  min-height: 70vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: 80px;
  background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-card) 100%);
}

.page-about__section-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.3;
  transform: skewY(var(--about-diagonal-angle)) scale(1.2);
  transform-origin: left bottom;
  pointer-events: none;
}

.page-about__bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
  display: block;
}

/* 内容区域 */
.page-about__content {
  position: relative;
  z-index: 1;
}

/* 章节编号 */
.section-counter {
  display: block;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 5rem;
  line-height: 1;
  color: var(--color-accent-green);
  opacity: 0.25;
  margin-bottom: -1.2rem;
  letter-spacing: -0.05em;
}

.page-about__section--mission .section-counter {
  font-size: 7rem;
  opacity: 0.4;
}

/* 标题 */
.page-about__title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 2.4rem;
  line-height: 1.2;
  margin: 0.5rem 0 1rem;
  color: var(--color-text);
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.page-about__section--mission .page-about__title {
  font-size: 3rem;
}

/* 描述文字 */
.page-about__desc {
  font-size: 1.1rem;
  max-width: 720px;
  margin-bottom: 1.5rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.page-about__section--mission .page-about__desc {
  font-size: 1.2rem;
  color: var(--color-text);
}

/* 网格卡片 */
.page-about__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin: 40px 0;
}

/* 卡片悬停效果 */
.card[data-hover-expand] {
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
  border: var(--about-card-border);
  background: var(--color-bg-card);
  padding: 24px;
  border-radius: var(--radius-md);
  cursor: default;
  position: relative;
}

.card[data-hover-expand]:hover {
  transform: translateY(-6px) scale(1.02);
  box-shadow: var(--about-border-glow), var(--shadow-card);
  border-color: var(--color-accent-green);
}

.card__icon {
  margin-bottom: 16px;
}

.card__heading {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.3rem;
  margin-bottom: 8px;
  color: var(--color-text);
}

.card__text {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* 优势配图 */
.page-about__advantage-img {
  width: 100%;
  max-width: 600px;
  height: auto;
  border-radius: var(--radius-md);
  margin-top: 32px;
  box-shadow: var(--shadow-card);
  border: 2px solid var(--color-border);
  display: block;
}

/* 数据来源区块 */
.page-about__source-features {
  display: flex;
  flex-wrap: wrap;
  gap: 32px 48px;
  margin-top: 32px;
}

.page-about__source-feature {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
}

.page-about__source-feature .data-highlight {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-accent-green);
}

/* 旧版传承区 */
.page-about__legacy-block {
  display: flex;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
  margin: 32px 0 24px;
}

.page-about__legacy-icon {
  width: 120px;
  height: auto;
  border-radius: var(--radius-sm);
  box-shadow: 0 0 0 3px var(--color-gold), var(--shadow-card);
}

.accent-badge {
  display: inline-block;
  background: var(--color-accent-orange);
  color: #0a192f;
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  box-shadow: 0 4px 12px rgba(255, 111, 0, 0.3);
}

/* 内链按钮组 */
.page-about__links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 32px;
}

/* 按钮变量（复用共享类但在此调整） */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1rem;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  cursor: pointer;
  text-decoration: none;
  border: 2px solid transparent;
}

.btn-primary {
  background: var(--color-accent-green);
  color: #0a192f;
  border-color: var(--color-accent-green);
}

.btn-primary:hover {
  background: transparent;
  color: var(--color-accent-green);
  box-shadow: var(--about-border-glow);
}

.btn-secondary {
  background: transparent;
  color: var(--color-accent-green);
  border-color: var(--color-accent-green);
}

.btn-secondary:hover {
  background: var(--color-accent-green);
  color: #0a192f;
}

/* 移动端优先响应式 */
@media (max-width: 768px) {
  .page-about__inner {
    padding: 0 16px;
  }

  .page-about__section {
    padding: 40px 0 32px;
  }

  .page-about__section--mission {
    min-height: auto;
    padding-top: 60px;
  }

  .section-counter {
    font-size: 3.5rem;
  }

  .page-about__section--mission .section-counter {
    font-size: 4.5rem;
  }

  .page-about__title {
    font-size: 1.8rem;
  }

  .page-about__section--mission .page-about__title {
    font-size: 2rem;
  }

  .page-about__desc {
    font-size: 1rem;
  }

  .page-about__section--mission .page-about__desc {
    font-size: 1.05rem;
  }

  .page-about__grid {
    gap: 16px;
    margin: 24px 0;
  }

  .card[data-hover-expand] {
    padding: 16px;
  }

  .card__heading {
    font-size: 1.1rem;
  }

  .page-about__source-features {
    gap: 20px;
  }

  .page-about__source-feature .data-highlight {
    font-size: 1.3rem;
  }

  .page-about__legacy-icon {
    width: 80px;
  }

  .page-about__section-bg {
    transform: skewY(-4deg) scale(1.3);
  }
}

/* 桌面优化 */
@media (min-width: 1024px) {
  .page-about__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about__content {
    padding-right: 5%;
  }

  .page-about__section--mission .page-about__content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 40px;
    align-items: center;
  }

  .page-about__section--mission .section-counter {
    grid-column: 1 / -1;
  }

  .page-about__advantage-img {
    max-width: 100%;
  }

  .page-about__source-features {
    flex-wrap: nowrap;
  }
}