/* ===== page-about 专属样式 ===== */
.page-about {
  display: block;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: var(--line-height-body);
}

/* 面包屑 */
.page-about .about-breadcrumb {
  padding: var(--spacing-lg) 0 var(--spacing-md);
}
.page-about .about-breadcrumb .breadcrumb {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin: 0;
  padding: 0;
  font-size: 14px;
  color: var(--color-text-secondary);
}
.page-about .about-breadcrumb .breadcrumb li {
  display: flex;
  align-items: center;
}
.page-about .about-breadcrumb .breadcrumb li + li::before {
  content: "/";
  margin: 0 var(--spacing-xs);
  color: var(--color-text-secondary);
  opacity: 0.5;
}
.page-about .about-breadcrumb .breadcrumb a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}
.page-about .about-breadcrumb .breadcrumb a:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

/* 编号章节体系 */
.page-about .about-section-number {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 48px;
  line-height: 1;
  color: var(--color-primary);
  opacity: 0.35;
  margin-bottom: var(--spacing-sm);
  letter-spacing: -2px;
  user-select: none;
}
.page-about .about-section-number--accent {
  color: var(--color-accent);
  opacity: 0.4;
}
.page-about .about-section-number--light {
  color: var(--color-text);
  opacity: 0.15;
}

/* ===== 首屏左右分屏 ===== */
.page-about .about-hero {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2xl);
  padding: var(--spacing-xl) 0 var(--spacing-3xl);
  border-bottom: 1px solid var(--color-border);
}

/* 左侧品牌叙事 */
.page-about .about-hero-left {
  flex: 1 1 50%;
  position: relative;
  padding: var(--spacing-xl) 0;
  background: linear-gradient(160deg, #1A1A1A 0%, #1f2e24 40%, #1A1A1A 80%);
  background-size: 200% 200%;
  animation: aboutBgShift 12s ease infinite;
  border-radius: 0;
  border-left: 4px solid var(--color-primary);
  padding-left: var(--spacing-lg);
}

@keyframes aboutBgShift {
  0%   { background-position: 0% 0%; }
  50%  { background-position: 100% 100%; }
  100% { background-position: 0% 0%; }
}

.page-about .about-title {
  font-family: var(--font-heading);
  font-size: var(--font-size-h1);
  line-height: 1.1;
  margin: 0 0 var(--spacing-md);
  background: linear-gradient(135deg, #2E8B57 0%, #FF6B35 40%, #2E8B57 70%, #FFD700 100%);
  background-size: 300% 300%;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: titleGradientFlow 6s ease infinite;
  letter-spacing: -0.5px;
}

@keyframes titleGradientFlow {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.page-about .about-desc {
  font-size: var(--font-size-body);
  color: var(--color-text-secondary);
  max-width: 540px;
  margin: 0 0 var(--spacing-lg);
  line-height: 1.7;
}

/* 品牌使命滚动渐变区域 */
.page-about .about-mission-scroll {
  position: relative;
  padding: var(--spacing-md) 0 var(--spacing-md) var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  border-left: 2px solid var(--color-accent);
  background: linear-gradient(90deg, rgba(255,107,53,0.08) 0%, transparent 80%);
  transition: background var(--transition);
}
.page-about .about-mission-scroll:hover {
  background: linear-gradient(90deg, rgba(255,107,53,0.18) 0%, rgba(46,139,87,0.08) 80%);
}
.page-about .about-mission-text {
  font-size: 15px;
  color: var(--color-text);
  margin: 0;
  font-style: italic;
  line-height: 1.6;
}

.page-about .about-image-block {
  margin-top: var(--spacing-lg);
}
.page-about .about-brand-img {
  display: block;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--color-border-strong);
  object-fit: cover;
  aspect-ratio: 600 / 400;
}

/* 右侧时间线 */
.page-about .about-hero-right {
  flex: 1 1 50%;
  padding: var(--spacing-xl) 0;
  border-right: 2px solid var(--color-border);
  padding-right: var(--spacing-lg);
}

.page-about .about-subtitle {
  font-family: var(--font-heading);
  font-size: var(--font-size-h2);
  margin: 0 0 var(--spacing-lg);
  color: var(--color-text);
  letter-spacing: -0.3px;
}

/* 时间线容器 */
.page-about .about-timeline-wrap {
  display: flex;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.page-about .about-timeline-svg {
  flex: 0 0 40px;
  display: flex;
  justify-content: center;
}
.page-about .timeline-svg-line {
  width: 40px;
  height: 360px;
  display: block;
}

.page-about .about-timeline-nodes {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
}

/* 每个时间线节点 */
.page-about .timeline-node {
  display: flex;
  gap: var(--spacing-md);
  align-items: flex-start;
  cursor: default;
}
.page-about .timeline-marker {
  flex: 0 0 24px;
  display: flex;
  justify-content: center;
  padding-top: 4px;
}
.page-about .timeline-marker svg {
  display: block;
}
.page-about .timeline-content {
  flex: 1;
  cursor: pointer;
  transition: background var(--transition-fast);
  border-radius: 0;
  padding: var(--spacing-sm) var(--spacing-sm);
  margin: calc(-1 * var(--spacing-sm));
}
.page-about .timeline-content:hover {
  background: rgba(46,139,87,0.08);
}
.page-about .timeline-title {
  font-family: var(--font-heading);
  font-size: var(--font-size-h3);
  margin: 0 0 var(--spacing-xs);
  color: var(--color-primary);
}
.page-about .timeline-summary {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin: 0;
}

/* 展开详情 */
.page-about .timeline-detail {
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transition: max-height 0.4s ease, opacity 0.3s ease, margin 0.3s ease;
  margin-top: 0;
  padding: 0 var(--spacing-md) 0 0;
}
.page-about .timeline-detail[data-open] {
  max-height: 240px;
  opacity: 1;
  margin-top: var(--spacing-sm);
}
.page-about .timeline-detail p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin: 0;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--color-surface);
  border-left: 2px solid var(--color-primary);
}

/* 时间线横幅插图 */
.page-about .about-timeline-banner {
  margin-top: var(--spacing-lg);
}
.page-about .timeline-banner-img {
  display: block;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--color-border-strong);
  object-fit: cover;
  aspect-ratio: 800 / 200;
}

/* ===== 联系方式区域 ===== */
.page-about .about-contact {
  padding: var(--spacing-3xl) 0 var(--spacing-2xl);
  border-bottom: 1px solid var(--color-border);
}
.page-about .about-contact-inner {
  position: relative;
}
.page-about .about-contact-heading {
  font-family: var(--font-heading);
  font-size: var(--font-size-h2);
  margin: 0 0 var(--spacing-xl);
  color: var(--color-text);
}

.page-about .about-contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.page-about .contact-card {
  background: var(--color-surface);
  padding: var(--spacing-lg);
  border-left: 4px solid var(--color-primary);
  transition: background var(--transition-fast);
}
.page-about .contact-card:hover {
  background: var(--color-surface-hover);
}
.page-about .contact-card:nth-child(2) {
  border-left-color: var(--color-accent);
}
.page-about .contact-card:last-child {
  border-left-color: var(--color-highlight);
}

.page-about .contact-card-icon {
  margin-bottom: var(--spacing-sm);
}
.page-about .contact-card-icon svg {
  display: block;
}

.page-about .contact-card-label {
  font-family: var(--font-heading);
  font-size: 18px;
  margin: 0 0 var(--spacing-xs);
  color: var(--color-text);
}
.page-about .contact-card-value {
  font-size: 16px;
  color: var(--color-text-secondary);
  margin: 0 0 var(--spacing-xs);
  word-break: break-all;
}
.page-about .contact-card-note {
  font-size: 13px;
  color: var(--color-text-secondary);
  opacity: 0.7;
  margin: 0;
}

.page-about .about-contact-image {
  margin-top: var(--spacing-lg);
}
.page-about .contact-scene-img {
  display: block;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--color-border-strong);
  object-fit: cover;
  aspect-ratio: 500 / 300;
}

/* ===== 信任声明 ===== */
.page-about .about-trust {
  padding: var(--spacing-xl) 0 var(--spacing-2xl);
  text-align: center;
}
.page-about .about-trust-text {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin: 0;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.7;
  border-top: 1px solid var(--color-border);
  padding-top: var(--spacing-lg);
}

/* ===== 桌面端媒体查询 ===== */
@media (min-width: 768px) {
  .page-about {
    padding: 0 var(--spacing-xl);
  }
  .page-about .about-hero {
    flex-direction: row;
    gap: var(--spacing-3xl);
    padding: var(--spacing-2xl) 0 var(--spacing-3xl);
  }
  .page-about .about-hero-left {
    padding: var(--spacing-2xl) var(--spacing-xl);
    border-left-width: 6px;
  }
  .page-about .about-hero-right {
    padding: var(--spacing-2xl) var(--spacing-xl);
  }
  .page-about .about-section-number {
    font-size: 64px;
  }
  .page-about .about-title {
    font-size: 48px;
  }
  .page-about .about-desc {
    font-size: 17px;
  }
  .page-about .about-contact-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
  }
  .page-about .about-contact {
    padding: var(--spacing-3xl) 0;
  }
  .page-about .about-timeline-wrap {
    gap: var(--spacing-lg);
  }
  .page-about .timeline-title {
    font-size: 22px;
  }
  .page-about .about-timeline-banner {
    margin-top: var(--spacing-xl);
  }
  .page-about .about-contact-image {
    margin-top: var(--spacing-xl);
    max-width: 600px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero-left {
    padding: var(--spacing-3xl) var(--spacing-2xl);
  }
  .page-about .about-hero-right {
    padding: var(--spacing-3xl) var(--spacing-2xl);
  }
  .page-about .about-title {
    font-size: 56px;
  }
  .page-about .about-section-number {
    font-size: 72px;
  }
  .page-about .about-contact-grid {
    gap: var(--spacing-xl);
  }
}