/* ===== 品牌档案页面专属样式 ===== */
.page-about {
  --timeline-line-color: var(--clr-border-subtle);
  --timeline-dot-size: 1rem;
  --timeline-line-width: 3px;
  --card-gap: var(--space-xl);
  color: var(--clr-text-light);
  background-color: var(--clr-background-dark);
}

/* 移动端优先布局 */
.page-about .container {
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-md);
  padding-right: var(--space-md);
}

/* 面包屑 */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  padding: var(--space-md) 0 var(--space-xs);
  font-family: var(--font-body);
  font-size: var(--size-sm);
  color: var(--clr-text-muted);
}
.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "›";
  margin: 0 var(--space-xs);
  opacity: 0.6;
}
.page-about .breadcrumb__link {
  color: var(--clr-primary-gold);
  text-decoration: none;
}
.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible {
  text-decoration: underline;
}

/* 首屏框景 */
.page-about .about-hero {
  position: relative;
  min-height: 60vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  margin-bottom: var(--space-2xl);
  /* 双线边框（frame-box模拟） */
  border: 2px solid var(--clr-border-subtle);
  outline: 1px solid var(--clr-primary-gold);
  outline-offset: -8px;
}
.page-about .about-hero__image {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.page-about .about-hero__bg {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.25;
}
.page-about .about-hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}
.page-about .about-hero__title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(var(--size-2xl), 6vw, var(--size-4xl));
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--clr-text-light);
  /* 斜切效果 */
  transform: skewX(-5deg);
  display: inline-block;
  background: linear-gradient(135deg, var(--clr-primary-gold) 0%, var(--clr-accent-red) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-md);
  line-height: 1.1;
}
.page-about .about-hero__subtitle {
  font-family: var(--font-body);
  font-size: var(--size-lg);
  color: var(--clr-text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* 时间轴区域 */
.page-about .about-timeline {
  margin-bottom: var(--space-3xl);
}
.page-about .about-timeline__heading {
  font-family: var(--font-heading);
  font-size: var(--size-2xl);
  color: var(--clr-primary-gold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-xl);
  padding-left: var(--space-lg); /* 与时间轴对齐 */
  border-left: 4px solid var(--clr-primary-gold);
  padding-left: var(--space-sm);
}
.page-about .about-timeline__track {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-2xl);
  padding-left: calc(var(--timeline-dot-size) * 2 + var(--space-lg)); /* 为左侧线留空间 */
}
/* 垂直时间轴线 */
.page-about .about-timeline__track::before {
  content: '';
  position: absolute;
  left: calc(var(--timeline-dot-size) + var(--space-xs));
  top: 0;
  bottom: 0;
  width: var(--timeline-line-width);
  background: var(--timeline-line-color);
}
.page-about .about-timeline__node {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  padding: var(--space-md);
  background: var(--clr-surface-dark);
  border: 1px solid var(--clr-border-subtle);
  transition: box-shadow var(--transition), transform var(--transition);
}
.page-about .about-timeline__node:hover,
.page-about .about-timeline__node:focus-visible {
  box-shadow: 0 0 0 2px var(--clr-primary-gold), var(--shadow-md);
  transform: scale(1.01);
}
/* 节点圆点（定位在左侧线） */
.page-about .about-timeline__dot {
  position: absolute;
  left: calc(-1 * (var(--timeline-dot-size) * 2 + var(--space-lg)) + var(--space-xs));
  top: var(--space-md);
  width: var(--timeline-dot-size);
  height: var(--timeline-dot-size);
  border-radius: 50%;
  background: var(--clr-primary-gold);
  z-index: 1;
}
/* 年份标签（位于圆点上方或旁边） */
.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: var(--size-xs);
  color: var(--clr-primary-gold);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  position: absolute;
  left: calc(-1 * (var(--timeline-dot-size) * 2 + var(--space-lg)) - 4rem);
  top: var(--space-md);
  white-space: nowrap;
  font-weight: 700;
}
.page-about .about-timeline__card .data-panel__header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: var(--space-md);
}
.page-about .about-timeline__card .data-panel__title {
  font-family: var(--font-heading);
  font-size: var(--size-xl);
  color: var(--clr-primary-gold);
  text-transform: uppercase;
  transform: skewX(-5deg);
  letter-spacing: 0.03em;
}
.page-about .about-timeline__img {
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  margin-top: var(--space-md);
  border: 1px solid var(--clr-border-subtle);
}
.page-about .about-timeline__card p {
  font-family: var(--font-body);
  line-height: 1.6;
  color: var(--clr-text-light);
}

/* 用户承诺区域 */
.page-about .about-commitment {
  background: var(--clr-surface-dark);
  border-top: 3px solid var(--clr-primary-gold);
  padding: var(--space-2xl) 0;
  margin-bottom: var(--space-2xl);
}
.page-about .about-commitment__inner {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
  align-items: center;
}
.page-about .about-commitment__text {
  flex: 1 1 60%;
}
.page-about .about-commitment__heading {
  font-family: var(--font-heading);
  font-size: var(--size-2xl);
  color: var(--clr-accent-red);
  text-transform: uppercase;
  transform: skewX(-5deg);
  margin-bottom: var(--space-md);
  letter-spacing: 0.03em;
}
.page-about .about-commitment__text p {
  font-family: var(--font-body);
  line-height: 1.7;
  margin-bottom: var(--space-sm);
}
.page-about .about-commitment__media {
  flex: 0 0 auto;
  max-width: 400px;
}
.page-about .about-commitment__img {
  width: 100%;
  height: auto;
  border: 1px solid var(--clr-border-subtle);
}

/* 内部链接网格 */
.page-about .about-links {
  margin-bottom: var(--space-3xl);
}
.page-about .about-links .grid {
  grid-template-columns: 1fr;
  gap: var(--space-md);
}
.page-about .about-links .btn {
  width: 100%;
  text-align: center;
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-heading);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 2px solid var(--clr-primary-gold);
  background: transparent;
  color: var(--clr-primary-gold);
  transition: background var(--transition), color var(--transition);
}
.page-about .about-links .btn:hover,
.page-about .about-links .btn:focus-visible {
  background: var(--clr-primary-gold);
  color: var(--clr-background-dark);
}

/* 桌面端大屏调整 */
@media (min-width: 768px) {
  .page-about .about-hero__title {
    transform: skewX(-8deg);
  }
  .page-about .about-timeline__node {
    flex-direction: row;
    gap: var(--space-lg);
  }
  .page-about .about-timeline__card .data-panel__grid {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: var(--space-lg);
    align-items: start;
  }
  .page-about .about-timeline__img {
    max-width: 300px;
  }
  .page-about .about-commitment__inner {
    flex-direction: row;
  }
  .page-about .about-commitment__text {
    order: 1;
  }
  .page-about .about-commitment__media {
    order: 2;
  }
  .page-about .about-links .grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* 窄屏额外间隔 */
@media (max-width: 767px) {
  .page-about .about-timeline__year {
    position: static;
    margin-left: auto;
  }
  .page-about .about-timeline__dot {
    left: -1.5rem;
    top: 1rem;
  }
  .page-about .about-timeline__track {
    padding-left: 2rem;
  }
  .page-about .about-timeline__track::before {
    left: 0.4rem;
  }
  .page-about .about-hero {
    min-height: 40vh;
  }
}

/* 悬停高亮年份效果（配合data-year） */
.page-about .about-timeline__node:hover .about-timeline__year,
.page-about .about-timeline__node:focus-within .about-timeline__year {
  color: var(--clr-accent-red);
  text-decoration: underline;
}