/* ===== 品牌介绍页 (page-about) 专属样式 ===== */
.page-about {
  --page-about-hero-gap: var(--space-6);
  --page-about-section-gap: var(--space-10);
  --page-about-tl-line-color: #2C1E16;
  --page-about-tl-dot-color: #E85D3A;
  --page-about-tl-card-bg: #F5F0E8;
  --page-about-feature-num-color: #E85D3A;
  --page-about-border-light: rgba(44,30,22,0.10);
  --page-about-decor-size: clamp(120px, 18vw, 200px);

  display: flex;
  flex-direction: column;
  gap: var(--page-about-section-gap);
  padding: var(--space-6) var(--side-padding) var(--space-10);
  max-width: var(--content-max-width);
  margin: 0 auto;
  background-color: var(--color-bg);
  color: var(--color-text-light);
}

/* ----- 面包屑 ----- */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}
.page-about .breadcrumb-link {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-fast);
}
.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  border-bottom-color: var(--color-primary);
}
.page-about .breadcrumb-sep {
  color: var(--color-text-muted);
  font-weight: 300;
}
.page-about .breadcrumb-current {
  color: var(--color-text-light);
  font-weight: 500;
}

/* ----- Hero 分屏区域 ----- */
.page-about__hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--page-about-hero-gap);
  align-items: center;
  padding: var(--space-8) 0;
  border-bottom: 1px solid var(--page-about-border-light);
}
.page-about__hero-text {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.page-about__heading {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  line-height: 1.1;
  color: var(--color-text-light);
  margin: 0;
  letter-spacing: -0.02em;
}
.page-about__tagline {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--color-primary);
  background-color: rgba(0,212,255,0.08);
  padding: var(--space-1) var(--space-2);
  border-left: 3px solid var(--color-primary);
  display: inline-block;
  width: fit-content;
}
.page-about__lead {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--color-text-muted);
  max-width: 42ch;
  margin: 0;
}
.page-about__hero-visual {
  display: flex;
  justify-content: flex-end;
  align-items: center;
}
.page-about__hero-img {
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-sm);
  box-shadow: 0 4px 24px rgba(0,0,0,0.3);
}

/* ----- 理念区 (时间线) ----- */
.page-about__milestones {
  padding: var(--space-6) 0;
  border-bottom: 1px solid var(--page-about-border-light);
}
.page-about__section-title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(1.8rem, 4vw, 3rem);
  color: var(--color-text-light);
  margin: 0 0 var(--space-2);
  letter-spacing: -0.01em;
}
.page-about__section-desc {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 1rem;
  color: var(--color-text-muted);
  max-width: 60ch;
  margin: 0 0 var(--space-6);
  line-height: 1.6;
}

/* 时间线容器 */
.page-about__timeline {
  position: relative;
  width: 100%;
  overflow-x: auto;
  overflow-y: visible;
  padding: var(--space-4) 0;
  -webkit-overflow-scrolling: touch;
}
.page-about__timeline-svg {
  display: block;
  width: 100%;
  min-width: 700px;
  height: auto;
  margin-bottom: var(--space-4);
}
/* 时间线卡片网格 */
.page-about__timeline-items {
  display: flex;
  gap: var(--space-4);
  min-width: 700px;
  justify-content: space-between;
  padding: 0 var(--space-2);
}
.page-about__tl-card {
  --tl-card-width: clamp(140px, 16vw, 200px);
  flex: 0 0 var(--tl-card-width);
  background-color: var(--page-about-tl-card-bg);
  border: 1px solid var(--page-about-border-light);
  border-top: 3px solid var(--page-about-tl-dot-color);
  padding: var(--space-3) var(--space-2);
  border-radius: var(--radius-sm);
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
  cursor: default;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}
.page-about__tl-card:hover,
.page-about__tl-card:focus-visible {
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
  transform: translateY(-4px);
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}
.page-about__tl-icon {
  width: 40px;
  height: 40px;
  object-fit: contain;
  margin-bottom: var(--space-1);
}
.page-about__tl-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-text-dark);
  margin: 0;
}
.page-about__tl-desc {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 0.85rem;
  color: #4A3F3A;
  line-height: 1.5;
  margin: 0;
}

/* ----- 服务特色 (卡片网格) ----- */
.page-about__features {
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--page-about-border-light);
}
.page-about .grid-col-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}
.page-about__feature-card {
  background-color: var(--color-surface);
  border: 1px solid var(--page-about-border-light);
  padding: var(--space-5) var(--space-4);
  border-radius: var(--radius-sm);
  transition: box-shadow var(--transition-fast), border-color var(--transition-fast);
}
.page-about__feature-card:hover {
  box-shadow: 0 6px 20px rgba(0,0,0,0.35);
  border-color: var(--color-primary);
}
.page-about__feature-num {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--page-about-feature-num-color);
  line-height: 1;
  margin-bottom: var(--space-2);
}
.page-about__feature-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-text-dark);
  margin: 0 0 var(--space-1);
}
.page-about .card-text {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 0.95rem;
  color: #4A3F3A;
  line-height: 1.6;
  margin: 0;
}

/* ----- 装饰块 ----- */
.page-about__decor {
  display: flex;
  justify-content: flex-end;
  padding: var(--space-2) 0;
}
.page-about__decor-img {
  width: var(--page-about-decor-size);
  height: var(--page-about-decor-size);
  object-fit: cover;
  border-radius: var(--radius-sm);
  opacity: 0.7;
}

/* ----- 内部链接导航 ----- */
.page-about__internal-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  padding: var(--space-4) 0;
  border-top: 1px solid var(--page-about-border-light);
}
.page-about__internal-link {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-light);
  background-color: transparent;
  border: 1px solid var(--color-border-strong);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-pill);
  text-decoration: none;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}
.page-about__internal-link:hover,
.page-about__internal-link:focus-visible {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: #0D0D0D;
  outline: none;
}

/* ===== 响应式：移动端 ===== */
@media (max-width: 768px) {
  .page-about {
    padding: var(--space-4) var(--space-3) var(--space-8);
    gap: var(--space-6);
  }
  .page-about__hero {
    grid-template-columns: 1fr;
    gap: var(--space-4);
    padding: var(--space-4) 0;
  }
  .page-about__hero-visual {
    justify-content: center;
  }
  .page-about__hero-img {
    width: 100%;
    max-width: 320px;
    height: auto;
  }
  .page-about__heading {
    font-size: clamp(2rem, 8vw, 2.8rem);
  }
  .page-about__lead {
    max-width: 100%;
  }
  .page-about__timeline-items {
    flex-wrap: nowrap;
    overflow-x: auto;
    gap: var(--space-3);
    padding-bottom: var(--space-2);
    min-width: unset;
  }
  .page-about__tl-card {
    flex: 0 0 60vw;
    max-width: 240px;
  }
  .page-about .grid-col-3 {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }
  .page-about__internal-nav {
    flex-direction: column;
    align-items: stretch;
  }
  .page-about__internal-link {
    text-align: center;
  }
  .page-about__decor {
    justify-content: center;
  }
}

/* 窄屏小手机 (480px 以下) */
@media (max-width: 480px) {
  .page-about__tl-card {
    flex: 0 0 80vw;
  }
  .page-about__feature-card {
    padding: var(--space-3) var(--space-2);
  }
  .page-about__milestones,
  .page-about__features {
    padding: var(--space-3) 0;
  }
}