/* ===== 品牌档案页专属 CSS (scope: .page-about) ===== */

/* 设计变量 */
.page-about {
  --page-cover-bg: linear-gradient(135deg, var(--color-white) 0%, var(--color-light-gray) 60%, var(--color-deep-blue) 100%);
  --page-gold-line: var(--color-gold);
  --page-cover-text-shadow: 2px 2px 0 rgba(0,0,0,0.05);
  --page-timeline-line: var(--color-electric-blue);
  --page-philosophy-accent: var(--color-deep-blue);
  --page-card-hover-shadow: 8px 8px 0 rgba(0,0,0,0.18);
  --page-grid-bg-opacity: 0.04;

  /* 排版增强 */
  --page-font-title: var(--font-heading);
  --page-font-body: var(--font-body);
  --page-number-font: var(--font-accent);
}

/* ===== 移动端优先 ===== */

/* 首屏封面 */
.page-about .page-cover {
  padding: var(--space-3xl) 0 var(--space-2xl);
  background: var(--page-cover-bg);
  position: relative;
  overflow: hidden;
}

.page-about .cover-layout {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.page-about .cover-info {
  order: 1;
}

.page-about .cover-image {
  order: 0;
}

.page-about .cover-img {
  width: 100%;
  max-width: 600px;
  height: auto;
  object-fit: contain;
  display: block;
  border: var(--border-thick) solid var(--color-deep-blue);
  box-shadow: var(--shadow-strong);
}

.page-about .cover-title {
  font-family: var(--page-font-title);
  font-size: 2.2rem;
  line-height: 1.1;
  color: var(--color-deep-blue);
  margin: var(--space-md) 0 var(--space-sm);
  text-shadow: var(--page-cover-text-shadow);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.25em;
}

.page-about .cover-x {
  color: var(--color-gold);
  font-size: 0.6em;
  font-weight: 400;
}

.page-about .cover-subtitle {
  font-family: var(--page-font-body);
  font-size: 1.1rem;
  color: var(--color-dark);
  letter-spacing: 0.05em;
  margin-bottom: var(--space-md);
  border-left: var(--border-thick) solid var(--color-gold);
  padding-left: var(--space-sm);
}

.page-about .cover-meta {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-dark);
  margin-bottom: var(--space-md);
  max-width: 600px;
}

.page-about .cover-tag {
  display: inline-block;
  margin-top: var(--space-sm);
}

.page-about .blueprint-line {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: var(--border-thick);
  background: repeating-linear-gradient(90deg, var(--color-electric-blue) 0px, var(--color-electric-blue) 8px, transparent 8px, transparent 16px);
  opacity: 0.5;
}

/* 通用章节 */
.page-about .section-header {
  margin-bottom: var(--space-2xl);
}

.page-about .section-title {
  font-family: var(--page-font-title);
  font-size: 2rem;
  color: var(--color-deep-blue);
  margin: var(--space-sm) 0;
  border-bottom: var(--border-medium) solid var(--color-gold);
  padding-bottom: var(--space-sm);
  display: inline-block;
}

.page-about .section-desc {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-dark);
  max-width: 680px;
}

/* 品牌概述 */
.page-about .overview-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.page-about .overview-text.card {
  border: var(--border-thick) solid var(--color-deep-blue);
  box-shadow: var(--shadow-medium);
}

.page-about .overview-text .card__header {
  background: var(--color-deep-blue);
  color: var(--color-white);
  padding: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.page-about .overview-text .card__title {
  font-family: var(--page-font-title);
  font-size: 1.4rem;
  margin: 0;
  color: var(--color-white);
}

.page-about .overview-text .card__body {
  padding: var(--space-lg);
  background: var(--color-white);
}

.page-about .overview-visual {
  margin-top: var(--space-md);
}

.page-about .visual-img {
  width: 100%;
  height: auto;
  max-width: 500px;
  border: var(--border-thick) solid var(--color-gold);
  box-shadow: var(--shadow-strong);
  display: block;
}

/* 时间线 */
.page-about .timeline-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  position: relative;
}

.page-about .timeline-grid::before {
  content: '';
  position: absolute;
  top: 0;
  left: 12px;
  width: var(--border-medium);
  height: 100%;
  background: var(--page-timeline-line);
  opacity: 0.3;
}

.page-about .timeline-node.card {
  border: var(--border-thick) solid var(--color-deep-blue);
  box-shadow: var(--shadow-medium);
  transition: box-shadow var(--transition-base);
  margin-left: var(--space-xl);
  position: relative;
}

.page-about .timeline-node.card::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--space-xl) - 6px);
  top: var(--space-lg);
  width: 14px;
  height: 14px;
  background: var(--color-electric-blue);
  border: var(--border-medium) solid var(--color-deep-blue);
  border-radius: 50%;
  z-index: 1;
}

.page-about .timeline-node .timeline-index {
  font-family: var(--page-number-font);
  font-size: 1.8rem;
  color: var(--color-electric-blue);
  background: var(--color-deep-blue);
  padding: var(--space-xs) var(--space-sm);
  display: inline-block;
  line-height: 1;
  margin-bottom: var(--space-sm);
}

.page-about .timeline-node .card__header {
  padding: var(--space-md) var(--space-lg);
}

.page-about .timeline-node .card__title {
  font-family: var(--page-font-title);
  font-size: 1.3rem;
  color: var(--color-deep-blue);
  margin: var(--space-sm) 0 0;
}

.page-about .timeline-node .card__body {
  padding: 0 var(--space-lg) var(--space-md);
}

.page-about .timeline-node .card__footer {
  padding: var(--space-sm) var(--space-lg) var(--space-md);
  border-top: var(--border-thin) solid var(--color-border);
}

.page-about .timeline-node:hover {
  box-shadow: var(--page-card-hover-shadow);
}

/* 品牌理念 */
.page-about .philosophy-grid {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.page-about .philosophy-card.card {
  border: var(--border-thick) solid var(--color-deep-blue);
  box-shadow: var(--shadow-medium);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.page-about .philosophy-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--page-card-hover-shadow);
}

.page-about .philosophy-card .card__header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--color-light-gray);
}

.page-about .philosophy-card .card__index {
  font-family: var(--page-number-font);
  font-size: 2rem;
  font-weight: bold;
  color: var(--color-gold);
  line-height: 1;
}

.page-about .philosophy-card .card__title {
  font-family: var(--page-font-title);
  font-size: 1.3rem;
  color: var(--color-deep-blue);
  margin: 0;
}

.page-about .philosophy-card .card__body {
  padding: var(--space-lg);
  background: var(--color-white);
}

.page-about .philosophy-card.card--gold {
  border-color: var(--color-gold);
}

.page-about .philosophy-card.card--red {
  border-color: var(--color-red);
}

.page-about .philosophy-visual {
  margin-top: var(--space-2xl);
}

.page-about .philosophy-visual .visual-img {
  width: 100%;
  height: auto;
  max-width: 700px;
  border: var(--border-medium) solid var(--color-gold);
  box-shadow: var(--shadow-gold);
  display: block;
}

/* 信任区块 */
.page-about .trust-block {
  text-align: center;
  padding: var(--space-xl) 0;
}

.page-about .trust-text {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-white);
  margin-bottom: var(--space-lg);
  line-height: 1.6;
  border-left: var(--border-thick) solid var(--color-gold);
  border-right: var(--border-thick) solid var(--color-gold);
  padding: var(--space-md) var(--space-lg);
  display: inline-block;
  background: rgba(0,51,102,0.4);
}

.page-about .trust-links {
  justify-content: center;
}

/* ===== 桌面断点 ≥768px ===== */
@media (min-width: 768px) {
  .page-about .cover-layout {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .page-about .cover-info {
    order: 0;
    flex: 1 1 55%;
  }

  .page-about .cover-image {
    order: 1;
    flex: 0 0 40%;
  }

  .page-about .cover-title {
    font-size: 3.2rem;
  }

  .page-about .cover-subtitle {
    font-size: 1.3rem;
  }

  .page-about .section-title {
    font-size: 2.6rem;
  }

  .page-about .overview-grid {
    flex-direction: row;
    align-items: flex-start;
  }

  .page-about .overview-text {
    flex: 1 1 55%;
  }

  .page-about .overview-visual {
    flex: 0 0 40%;
    margin-top: 0;
  }

  .page-about .timeline-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: var(--space-lg);
  }

  .page-about .timeline-grid::before {
    display: none;
  }

  .page-about .timeline-node.card {
    margin-left: 0;
  }

  .page-about .timeline-node.card::before {
    display: none;
  }

  .page-about .timeline-node:nth-child(even) {
    margin-top: var(--space-xl);
  }

  .page-about .philosophy-grid {
    flex-direction: row;
    gap: var(--space-lg);
  }

  .page-about .philosophy-card {
    flex: 1;
  }

  .page-about .philosophy-visual {
    display: flex;
    justify-content: center;
  }
}