/* =============================================
   page-about 品牌概况页面专属样式
   作用域限定，移动端优先
   ============================================= */
.page-about {
  --about-aside-width: 30%;
  --about-gap: var(--spacing-xl, 4rem);
  --about-card-radius: 8px;
  --about-transition: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  display: block;
  width: 100%;
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
  padding: var(--spacing-lg, 2rem) var(--spacing-md, 1rem);
  color: var(--color-text-light, #F1FAEE);
  font-family: var(--font-body, 'Open Sans', sans-serif);
}

/* ----- 面包屑 ----- */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--spacing-xs, 0.25rem);
  margin-bottom: var(--spacing-lg, 2rem);
  font-size: 0.85rem;
  font-family: var(--font-mono, monospace);
  color: var(--color-text-muted, #A8B2C1);
}
.page-about .breadcrumb__link {
  color: var(--color-secondary, #A8B2C1);
  text-decoration: none;
  transition: color var(--about-transition);
}
.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible {
  color: var(--color-accent, #06D6A0);
  outline: 2px solid var(--color-accent, #06D6A0);
  outline-offset: 2px;
}
.page-about .breadcrumb__sep {
  margin: 0 var(--spacing-xs, 0.25rem);
  user-select: none;
}
.page-about .breadcrumb__current {
  color: var(--color-primary, #E63946);
  font-weight: 700;
}

/* ----- 左右分屏布局 ----- */
.page-about__split {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg, 2rem);
}

/* ----- 左侧叙事区 ----- */
.page-about__aside {
  position: relative;
  overflow: hidden;
  border-radius: var(--about-card-radius);
  background: var(--color-bg-panel, #2B2D42);
  border: 1px solid var(--color-secondary, #A8B2C1);
  box-shadow: var(--shadow-card, 0 4px 20px rgba(0, 0, 0, 0.4));
  min-height: 360px;
}
.page-about__aside-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}
.page-about__aside-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
  max-width: 100%;
}
.page-about__aside-content {
  position: relative;
  z-index: 1;
  padding: var(--spacing-lg, 2rem);
  background: linear-gradient(135deg, rgba(26, 26, 26, 0.92) 60%, rgba(230, 57, 70, 0.35) 100%);
  backdrop-filter: blur(2px);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md, 1rem);
}
.page-about__tagline {
  font-family: var(--font-heading, 'Bebas Neue', Impact, sans-serif);
  font-weight: 700;
  font-style: italic;
  letter-spacing: 2px;
  line-height: 1.1;
  margin: 0;
}
.page-about__tagline-main {
  display: block;
  font-size: 2.8rem;
  color: var(--color-primary, #E63946);
  text-shadow: 2px 2px 0 rgba(0, 0, 0, 0.5);
}
.page-about__tagline-sub {
  display: block;
  font-size: 2rem;
  color: var(--color-accent, #06D6A0);
}
.page-about__aside-desc {
  font-size: 1rem;
  line-height: 1.5;
  color: var(--color-text-muted, #A8B2C1);
  max-width: 30ch;
  margin: 0;
}

/* 数据统计区域 */
.page-about__stats {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md, 1rem);
  margin-top: var(--spacing-sm, 0.5rem);
}
.page-about__stat-item {
  background: rgba(255, 255, 255, 0.05);
  border-left: 3px solid var(--color-primary, #E63946);
  padding: var(--spacing-sm, 0.5rem) var(--spacing-md, 1rem);
  border-radius: 0 var(--border-radius, 4px) var(--border-radius, 4px) 0;
}
.page-about__stat-number {
  display: block;
  font-family: var(--font-heading, 'Bebas Neue', Impact, sans-serif);
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--color-primary, #E63946);
  line-height: 1;
}
.page-about__stat-label {
  display: block;
  font-size: 0.8rem;
  font-family: var(--font-mono, monospace);
  color: var(--color-text-muted, #A8B2C1);
  text-transform: uppercase;
  letter-spacing: 1px;
}
.page-about__progress-bar {
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
  margin-top: var(--spacing-xs, 0.25rem);
  overflow: hidden;
}
.page-about__progress-fill {
  height: 100%;
  background: var(--color-accent, #06D6A0);
  border-radius: 3px;
  transition: width 1.2s ease;
}
.page-about__stat-img {
  width: 100%;
  max-width: 100%;
  height: auto;
  margin-top: var(--spacing-xs, 0.25rem);
  border-radius: 2px;
  display: block;
}

/* 信任声明 */
.page-about__trust {
  margin: var(--spacing-md, 1rem) 0 0;
  padding: var(--spacing-sm, 0.5rem) var(--spacing-md, 1rem);
  border-left: 2px solid var(--color-amber, #F4A261);
  background: rgba(244, 162, 97, 0.06);
  border-radius: 0 var(--border-radius, 4px) var(--border-radius, 4px) 0;
}
.page-about__trust p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--color-text-muted, #A8B2C1);
  font-style: italic;
}

/* ----- 右侧主内容区 ----- */
.page-about__main {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg, 2rem);
}

/* ----- 卡片通用 ----- */
.page-about__card {
  background: var(--color-bg-panel, #2B2D42);
  border: 1px solid var(--color-secondary, #A8B2C1);
  border-radius: var(--about-card-radius);
  box-shadow: var(--shadow-card, 0 4px 20px rgba(0, 0, 0, 0.4));
  overflow: hidden;
  transition: transform var(--about-transition), box-shadow var(--about-transition);
}
.page-about__card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.6);
}
.page-about__card-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-md, 1rem);
  padding: var(--spacing-lg, 2rem) var(--spacing-lg, 2rem) 0;
}
.page-about__card-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
}
.page-about__card-title {
  font-family: var(--font-heading, 'Bebas Neue', Impact, sans-serif);
  font-weight: 700;
  font-style: italic;
  letter-spacing: 2px;
  font-size: var(--font-size-h2, 3rem);
  color: var(--color-primary, #E63946);
  margin: 0;
  line-height: 1.1;
}
.page-about__card-body {
  padding: var(--spacing-md, 1rem) var(--spacing-lg, 2rem) var(--spacing-lg, 2rem);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md, 1rem);
}
.page-about__card-text {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text-light, #F1FAEE);
  margin: 0;
}
.page-about__card-text--extra[data-hidden="true"] {
  display: none;
}
.page-about__card-text--extra[data-hidden="false"] {
  display: block;
  animation: pageAboutFadeIn 0.4s ease;
}
@keyframes pageAboutFadeIn {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* 展开按钮 */
.page-about__toggle-btn {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm, 0.5rem);
  cursor: pointer;
  margin-top: var(--spacing-xs, 0.25rem);
}
.page-about__toggle-btn:focus-visible {
  outline: 2px solid var(--color-accent, #06D6A0);
  outline-offset: 2px;
}
.page-about__toggle-text {
  font-family: var(--font-mono, monospace);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.page-about__toggle-icon {
  display: inline-block;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-accent, #06D6A0);
  transition: transform var(--about-transition);
}
.page-about__toggle-btn[aria-expanded="true"] .page-about__toggle-icon {
  transform: rotate(45deg);
}

/* 斜切分隔线 */
.page-about__divider {
  width: 100%;
  height: 8px;
  margin: 0;
  line-height: 0;
}
.page-about__divider svg {
  display: block;
  width: 100%;
  height: 8px;
}

/* ----- 核心服务列表 ----- */
.page-about__service-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg, 2rem);
}
.page-about__service-item {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm, 0.5rem);
  padding: var(--spacing-md, 1rem);
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--border-radius, 4px);
  border: 1px solid transparent;
  transition: border-color var(--about-transition), background var(--about-transition);
}
.page-about__service-item:hover {
  border-color: var(--color-accent, #06D6A0);
  background: rgba(6, 214, 160, 0.05);
}
.page-about__service-icon {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs, 0.25rem);
}
.page-about__service-img {
  width: 80px;
  height: 80px;
  object-fit: cover;
  border-radius: 50%;
  border: 2px solid var(--color-secondary, #A8B2C1);
  display: block;
  max-width: 100%;
}
.page-about__service-label {
  font-family: var(--font-heading, 'Bebas Neue', Impact, sans-serif);
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--color-primary, #E63946);
}
.page-about__service-desc {
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--color-text-muted, #A8B2C1);
  text-align: center;
  margin: 0;
}

/* 行动按钮组 */
.page-about__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md, 1rem);
  margin-top: var(--spacing-sm, 0.5rem);
}
.page-about__actions .btn {
  flex: 1 1 auto;
  min-width: 140px;
}

/* ----- 底部联系引导 ----- */
.page-about__cta {
  text-align: center;
  padding: var(--spacing-lg, 2rem);
  background: linear-gradient(135deg, rgba(230, 57, 70, 0.12), rgba(6, 214, 160, 0.06));
  border: 1px solid var(--color-secondary, #A8B2C1);
  border-radius: var(--about-card-radius);
  margin-top: var(--spacing-sm, 0.5rem);
}
.page-about__cta-text {
  font-family: var(--font-heading, 'Bebas Neue', Impact, sans-serif);
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--color-text-light, #F1FAEE);
  margin: 0 0 var(--spacing-md, 1rem);
}

/* =============================================
   响应式：平板及以上
   ============================================= */
@media (min-width: 768px) {
  .page-about {
    padding: var(--spacing-xl, 4rem) var(--spacing-lg, 2rem);
  }
  .page-about__split {
    flex-direction: row;
    align-items: stretch;
  }
  .page-about__aside {
    flex: 0 0 var(--about-aside-width, 30%);
    min-height: 600px;
    position: sticky;
    top: calc(var(--header-height, 4rem) + var(--spacing-md, 1rem));
    align-self: flex-start;
    max-height: calc(100vh - var(--header-height, 4rem) - var(--spacing-xl, 4rem));
  }
  .page-about__aside-content {
    padding: var(--spacing-lg, 2rem);
    height: 100%;
    justify-content: space-between;
  }
  .page-about__main {
    flex: 1;
    min-width: 0;
    gap: var(--spacing-xl, 4rem);
  }
  .page-about__tagline-main {
    font-size: 3.6rem;
  }
  .page-about__tagline-sub {
    font-size: 2.4rem;
  }
  .page-about__stats {
    gap: var(--spacing-lg, 2rem);
  }
  .page-about__stat-number {
    font-size: 2.6rem;
  }
  .page-about__service-list {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about__service-img {
    width: 120px;
    height: 120px;
  }
  .page-about__card-title {
    font-size: var(--font-size-h2, 3rem);
  }
}

/* =============================================
   响应式：桌面大屏
   ============================================= */
@media (min-width: 1024px) {
  .page-about {
    padding: var(--spacing-xl, 4rem) 0;
  }
  .page-about__aside {
    flex-basis: 28%;
  }
  .page-about__tagline-main {
    font-size: 4.2rem;
  }
  .page-about__tagline-sub {
    font-size: 2.8rem;
  }
  .page-about__stat-number {
    font-size: 3rem;
  }
  .page-about__card-body {
    padding: var(--spacing-lg, 2rem) var(--spacing-xl, 4rem) var(--spacing-xl, 4rem);
  }
  .page-about__service-item {
    padding: var(--spacing-lg, 2rem);
  }
}

/* =============================================
   减少运动偏好
   ============================================= */
@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  .page-about__card:hover {
    transform: none;
  }
}