/* ===== 页面专属：品牌档案 ===== */
.page-about {
  --about-accent-glow: 0 0 30px rgba(255, 215, 0, 0.08);
  --about-timeline-width: 4px;
  --about-card-hover-y: -4px;
  display: block;
  width: 100%;
  background-color: var(--color-dark-bg);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  line-height: var(--lh-body);
}

/* 面包屑 */
.page-about .about-breadcrumb {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--spacing-md) var(--spacing-lg) 0;
  font-size: var(--fs-small);
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}
.page-about .about-breadcrumb a {
  color: var(--color-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}
.page-about .about-breadcrumb a:hover {
  color: var(--color-accent);
}
.page-about .breadcrumb-sep {
  color: var(--color-border);
  font-weight: var(--fw-bold);
}
.page-about .about-breadcrumb [aria-current="page"] {
  color: var(--color-text-secondary);
  font-weight: var(--fw-body);
}

/* 品牌叙事 —— 分屏 */
.page-about .about-narrative {
  max-width: var(--container-max);
  margin: var(--spacing-lg) auto var(--spacing-xl);
  padding: 0 var(--spacing-lg);
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: var(--spacing-xl);
  position: relative;
}
.page-about .about-narrative .split-panel {
  flex: 1 1 45%;
  min-width: 280px;
  position: relative;
}
.page-about .narrative-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-card), var(--about-accent-glow);
  background: var(--color-card-bg);
  position: relative;
  min-height: 320px;
}
.page-about .narrative-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  max-width: 100%;
  border-radius: var(--radius-lg);
}
.page-about .narrative-glow {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 30% 40%, rgba(106,13,173,0.25) 0%, transparent 70%);
  pointer-events: none;
  border-radius: var(--radius-lg);
}
.page-about .narrative-content {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--spacing-lg) 0;
}
.page-about .narrative-label {
  display: inline-block;
  font-family: var(--font-accent);
  font-size: var(--fs-tiny);
  font-weight: var(--fw-bold);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  margin-bottom: var(--spacing-sm);
  padding: var(--spacing-xs) var(--spacing-sm);
  border: 1px solid rgba(0,255,255,0.3);
  border-radius: var(--radius-sm);
  width: fit-content;
}
.page-about .narrative-title {
  font-family: var(--font-heading);
  font-weight: var(--fw-heading);
  font-size: var(--fs-heading);
  line-height: var(--lh-heading);
  letter-spacing: var(--ls-heading);
  margin: var(--spacing-md) 0;
  color: var(--color-text-primary);
}
.page-about .narrative-title .gold-em {
  color: var(--color-secondary);
}
.page-about .narrative-desc {
  font-size: var(--fs-body);
  color: var(--color-text-secondary);
  line-height: var(--lh-body);
  margin-bottom: var(--spacing-lg);
  max-width: 540px;
}
.page-about .narrative-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  align-items: center;
}
.page-about .narrative-cta {
  min-width: 180px;
  text-align: center;
}
.page-about .narrative-link {
  min-width: 180px;
  text-align: center;
}

/* 章节标题通用 */
.page-about .section-heading {
  font-family: var(--font-heading);
  font-weight: var(--fw-heading);
  font-size: clamp(1.6rem, 3.5vw, 2.6rem);
  line-height: var(--lh-heading);
  letter-spacing: var(--ls-heading);
  color: var(--color-text-primary);
  margin: 0 0 var(--spacing-xs);
  position: relative;
  display: inline-block;
}
.page-about .section-heading::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-secondary), var(--color-accent));
  margin-top: var(--spacing-sm);
  border-radius: 2px;
}
.page-about .section-sub {
  font-size: var(--fs-body);
  color: var(--color-text-secondary);
  margin: 0 0 var(--spacing-xl);
  max-width: 600px;
}

/* 核心服务 */
.page-about .about-services {
  padding: var(--spacing-xl) var(--spacing-lg) var(--spacing-2xl);
}
.page-about .services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--spacing-lg);
}
.page-about .service-card {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-xl) var(--spacing-lg);
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
  cursor: default;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}
.page-about .service-card:hover {
  transform: translateY(var(--about-card-hover-y));
  border-color: rgba(255,215,0,0.4);
  box-shadow: var(--shadow-card), 0 8px 32px rgba(106,13,173,0.2);
}
.page-about .service-icon {
  margin-bottom: var(--spacing-md);
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: rgba(255,215,0,0.06);
  border: 1px solid rgba(255,215,0,0.15);
  transition: background var(--transition-fast);
}
.page-about .service-card:hover .service-icon {
  background: rgba(255,215,0,0.12);
}
.page-about .service-icon svg {
  width: 48px;
  height: 48px;
}
.page-about .service-title {
  font-family: var(--font-heading);
  font-weight: var(--fw-bold);
  font-size: 1.25rem;
  color: var(--color-text-primary);
  margin: 0 0 var(--spacing-sm);
}
.page-about .service-desc {
  font-size: var(--fs-body);
  color: var(--color-text-secondary);
  line-height: var(--lh-body);
  margin: 0 0 var(--spacing-md);
  flex: 1;
}
.page-about .service-tag {
  align-self: flex-start;
  font-size: var(--fs-tiny);
  padding: var(--spacing-xs) var(--spacing-sm);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-sm);
  color: var(--color-accent);
  background: rgba(0,255,255,0.05);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* 品牌特色 —— 宽版视觉 */
.page-about .about-features {
  padding: var(--spacing-2xl) 0;
  position: relative;
  background: linear-gradient(180deg, var(--color-dark-bg) 0%, rgba(106,13,173,0.08) 50%, var(--color-dark-bg) 100%);
  overflow: hidden;
}
.page-about .about-features .container:first-child {
  position: relative;
  z-index: 2;
}
.page-about .features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  position: relative;
  z-index: 2;
  padding: 0 var(--spacing-lg);
}
.page-about .feature-card {
  background: rgba(26,26,46,0.7);
  backdrop-filter: blur(4px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  transition: transform var(--transition-base), border-color var(--transition-base), background var(--transition-base);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--spacing-sm);
}
.page-about .feature-card:hover {
  transform: translateY(var(--about-card-hover-y));
  border-color: rgba(255,215,0,0.25);
  background: rgba(26,26,46,0.9);
}
.page-about .feature-card__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid rgba(0,255,255,0.2);
  background: rgba(0,255,255,0.04);
  transition: background var(--transition-fast);
}
.page-about .feature-card:hover .feature-card__icon {
  background: rgba(0,255,255,0.1);
}
.page-about .feature-card__icon svg {
  width: 40px;
  height: 40px;
}
.page-about .feature-card__title {
  font-family: var(--font-heading);
  font-weight: var(--fw-bold);
  font-size: 1.1rem;
  color: var(--color-text-primary);
  margin: 0;
}
.page-about .feature-card__desc {
  font-size: var(--fs-small);
  color: var(--color-text-secondary);
  line-height: var(--lh-body);
  margin: 0;
}
.page-about .features-bg-visual {
  position: absolute;
  right: -5%;
  top: 10%;
  width: 320px;
  height: auto;
  opacity: 0.15;
  pointer-events: none;
  z-index: 0;
  transform: rotate(3deg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border-light);
}
.page-about .features-bg-img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  max-width: 100%;
}

/* 发展历程时间轴 */
.page-about .about-timeline {
  padding: var(--spacing-2xl) var(--spacing-lg);
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xl);
  align-items: flex-start;
}
.page-about .about-timeline .section-heading,
.page-about .about-timeline .section-sub {
  width: 100%;
  flex: 0 0 100%;
}
.page-about .timeline-wrapper {
  flex: 1 1 60%;
  min-width: 280px;
  position: relative;
  padding-left: 30px;
}
.page-about .timeline-line {
  position: absolute;
  left: 10px;
  top: 0;
  bottom: 0;
  width: var(--about-timeline-width);
  background: linear-gradient(180deg, var(--color-secondary), var(--color-accent), var(--color-primary));
  border-radius: 4px;
  transform: skewX(-12deg);
  transform-origin: top center;
  box-shadow: 0 0 12px rgba(255,215,0,0.15);
}
.page-about .timeline-nodes {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
  position: relative;
}
.page-about .timeline-node {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-lg);
  cursor: default;
  transition: transform var(--transition-fast);
  outline: none;
}
.page-about .timeline-node:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}
.page-about .timeline-node:hover {
  transform: translateX(4px);
}
.page-about .timeline-node__marker {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  z-index: 2;
  margin-top: 4px;
}
.page-about .marker-dot {
  width: 16px;
  height: 16px;
  background: var(--color-card-bg);
  border: 3px solid var(--color-secondary);
  border-radius: 50%;
  display: block;
  transition: background var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
  box-shadow: 0 0 0 4px rgba(255,215,0,0.05);
}
.page-about .timeline-node:hover .marker-dot {
  background: var(--color-secondary);
  border-color: var(--color-accent);
  box-shadow: 0 0 16px rgba(255,215,0,0.25);
}
.page-about .timeline-node:focus-visible .marker-dot {
  background: var(--color-secondary);
  border-color: var(--color-accent);
  box-shadow: 0 0 20px rgba(0,255,255,0.3);
}
.page-about .timeline-node__content {
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-md) var(--spacing-lg);
  flex: 1;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  position: relative;
}
.page-about .timeline-node__content::before {
  content: '';
  position: absolute;
  left: -8px;
  top: 16px;
  width: 12px;
  height: 12px;
  background: var(--color-card-bg);
  border-left: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  transform: rotate(45deg);
  transition: border-color var(--transition-fast);
}
.page-about .timeline-node:hover .timeline-node__content {
  border-color: rgba(255,215,0,0.25);
  box-shadow: 0 4px 20px rgba(106,13,173,0.15);
}
.page-about .timeline-node:hover .timeline-node__content::before {
  border-color: rgba(255,215,0,0.25);
}
.page-about .timeline-node__title {
  font-family: var(--font-heading);
  font-weight: var(--fw-bold);
  font-size: 1.1rem;
  color: var(--color-text-primary);
  margin: 0 0 var(--spacing-xs);
}
.page-about .timeline-node__desc {
  font-size: var(--fs-small);
  color: var(--color-text-secondary);
  line-height: var(--lh-body);
  margin: 0;
}
.page-about .timeline-side-visual {
  flex: 0 0 220px;
  max-width: 260px;
  margin-left: auto;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border-light);
  box-shadow: var(--shadow-card);
  align-self: flex-end;
}
.page-about .timeline-side-img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  max-width: 100%;
}

/* 底部品牌号召 */
.page-about .about-cta-strip {
  margin-top: var(--spacing-xl);
  padding: var(--spacing-2xl) var(--spacing-lg);
  background: linear-gradient(135deg, rgba(106,13,173,0.12) 0%, transparent 60%);
  border-top: 1px solid var(--color-border-light);
  border-bottom: 1px solid var(--color-border-light);
}
.page-about .cta-strip-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-lg);
}
.page-about .cta-strip-text {
  font-family: var(--font-heading);
  font-weight: var(--fw-bold);
  font-size: 1.4rem;
  color: var(--color-text-primary);
  margin: 0;
  letter-spacing: var(--ls-heading);
}
.page-about .cta-strip-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  align-items: center;
}

/* ===== 响应式 ===== */
/* 移动端优先 —— 基础窄屏适配 */
@media (max-width: 767px) {
  .page-about .about-narrative {
    flex-direction: column;
    padding: 0 var(--spacing-md);
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
  }
  .page-about .about-narrative .split-panel {
    flex: 1 1 100%;
    min-width: 0;
  }
  .page-about .narrative-visual {
    min-height: 200px;
  }
  .page-about .narrative-content {
    padding: var(--spacing-sm) 0;
  }
  .page-about .narrative-title {
    font-size: clamp(1.4rem, 6vw, 2rem);
  }
  .page-about .narrative-actions {
    flex-direction: column;
    align-items: stretch;
  }
  .page-about .narrative-cta,
  .page-about .narrative-link {
    width: 100%;
  }
  .page-about .about-services {
    padding: var(--spacing-lg) var(--spacing-md) var(--spacing-xl);
  }
  .page-about .services-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  .page-about .about-features {
    padding: var(--spacing-lg) 0;
  }
  .page-about .features-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    padding: 0 var(--spacing-md);
  }
  .page-about .feature-card {
    padding: var(--spacing-md);
  }
  .page-about .features-bg-visual {
    display: none;
  }
  .page-about .about-timeline {
    padding: var(--spacing-lg) var(--spacing-md);
    flex-direction: column;
  }
  .page-about .timeline-wrapper {
    flex: 1 1 100%;
    padding-left: 20px;
    min-width: 0;
  }
  .page-about .timeline-line {
    left: 6px;
    transform: skewX(-6deg);
  }
  .page-about .timeline-node {
    gap: var(--spacing-md);
  }
  .page-about .timeline-node__marker {
    width: 22px;
    height: 22px;
  }
  .page-about .marker-dot {
    width: 12px;
    height: 12px;
    border-width: 2px;
  }
  .page-about .timeline-side-visual {
    flex: 0 0 auto;
    max-width: 100%;
    width: 100%;
    margin-left: 0;
    margin-top: var(--spacing-md);
  }
  .page-about .about-cta-strip {
    padding: var(--spacing-lg) var(--spacing-md);
  }
  .page-about .cta-strip-inner {
    flex-direction: column;
    text-align: center;
  }
  .page-about .cta-strip-links {
    justify-content: center;
  }
  .page-about .about-breadcrumb {
    padding: var(--spacing-sm) var(--spacing-md) 0;
    font-size: var(--fs-tiny);
  }
  .page-about .section-heading {
    font-size: clamp(1.3rem, 4vw, 1.8rem);
  }
  .page-about .section-heading::after {
    width: 40px;
  }
}

/* 平板及桌面增强 */
@media (min-width: 768px) and (max-width: 1023px) {
  .page-about .about-narrative {
    gap: var(--spacing-lg);
  }
  .page-about .narrative-visual {
    min-height: 260px;
  }
  .page-about .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .features-bg-visual {
    width: 200px;
    right: -3%;
  }
  .page-about .timeline-side-visual {
    flex: 0 0 160px;
    max-width: 180px;
  }
}

/* 桌面大屏微调 */
@media (min-width: 1280px) {
  .page-about .narrative-visual {
    min-height: 400px;
  }
  .page-about .features-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about .timeline-side-visual {
    flex: 0 0 260px;
    max-width: 300px;
  }
}