/* page-about专属CSS */
.page-about {
  --about-gold-line: rgba(255, 215, 0, 0.35);
  --about-card-border: 1px solid rgba(198, 40, 40, 0.45);
  --about-timeline-width: 3px;
  --about-intro-gap: 2rem;
  --about-section-gap: 3rem;
  --about-cap-gap: 1.5rem;
}
.page-about__container {
  padding-top: var(--space-lg, 2rem);
  padding-bottom: var(--space-xxl, 4rem);
}
/* 面包屑适配 */
.page-about .breadcrumb {
  margin-bottom: var(--space-lg, 2rem);
}
/* 首屏intro区块 */
.page-about__intro {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--about-intro-gap);
  margin-bottom: var(--space-xxl, 4rem);
  text-align: center;
  border-bottom: var(--about-gold-line) 1px solid;
  padding-bottom: var(--space-xl, 3rem);
}
.page-about__intro-brand {
  flex-shrink: 0;
}
.page-about__brand-icon {
  display: block;
  max-width: 100%;
  height: auto;
  border-radius: 50%;
  box-shadow: 0 0 0 2px var(--about-gold-line), 0 8px 30px rgba(0,0,0,0.6);
  object-fit: contain;
}
.page-about__intro-text {
  max-width: 680px;
}
.page-about__intro-index {
  display: inline-block;
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  color: var(--gold, #FFD700);
  margin-bottom: 0.25rem;
}
.page-about__intro-title {
  font-family: var(--font-heading, 'Inter', sans-serif);
  font-weight: 100;
  font-size: var(--h1, 4rem);
  background: var(--gold-grad, linear-gradient(135deg,#FFD700,#FFA000));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin: 0 0 0.5rem;
  line-height: 1.1;
}
.page-about__intro-desc {
  font-size: 1.15rem;
  color: var(--white, #fff);
  opacity: 0.85;
  margin: 0 0 1rem;
}
.page-about__intro-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
}
.page-about__intro-tags .tag {
  font-size: 0.85rem;
}
/* 章节通用时间轴布局 */
.page-about__section {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-bottom: var(--about-section-gap);
  position: relative;
}
.page-about__section-timeline {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  position: relative;
  padding-left: 0.5rem;
}
.page-about__section-timeline .section-number {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  flex-shrink: 0;
}
.page-about__section-timeline .section-number__digit {
  font-size: 2.5rem;
  font-weight: 100;
  line-height: 1;
  color: var(--gold, #FFD700);
  letter-spacing: -0.02em;
}
.page-about__section-timeline .section-number__sub {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--crimson, #C62828);
  margin-top: 0.15rem;
}
.page-about__timeline-line {
  flex: 1;
  height: var(--about-timeline-width);
  background: var(--about-gold-line);
  align-self: center;
  margin-top: 0.6rem;
}
.page-about__section-content {
  padding-left: 0.5rem;
}
/* 卡片与内容 */
.page-about__section-content .card {
  background: var(--black-light, #1E1E1E);
  border: var(--about-card-border);
  box-shadow: var(--shadow-card, 0 4px 20px rgba(0,0,0,0.5));
  padding: var(--space-lg, 2rem);
  transition: box-shadow 0.3s, transform 0.3s;
}
.page-about__section-content .card:hover {
  box-shadow: var(--shadow-elevate, 0 12px 40px rgba(0,0,0,0.6));
  transform: translateY(-2px);
}
.page-about__origin-detail {
  margin-top: var(--space-md, 1rem);
  border-top: 1px solid rgba(255,215,0,0.15);
  padding-top: var(--space-md, 1rem);
  display: flex;
  gap: 0.75rem;
  font-size: 0.95rem;
}
.page-about__origin-detail .small-index {
  flex-shrink: 0;
  color: var(--gold, #FFD700);
  font-weight: 600;
  letter-spacing: 0.1em;
}
/* 核心能力网格 */
.page-about__cap-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--about-cap-gap);
}
.page-about__cap-card {
  position: relative;
  overflow: hidden;
  cursor: pointer;
  padding: var(--space-lg, 2rem);
}
.page-about__cap-card .card__index {
  font-size: 3rem;
  font-weight: 100;
  color: var(--gold-dark, #FFA000);
  opacity: 0.3;
  position: absolute;
  top: 0.25rem;
  right: 0.5rem;
  line-height: 1;
}
.page-about__cap-card .card__title {
  font-size: 1.5rem;
  font-weight: 400;
  margin: 0 0 0.5rem;
  color: var(--white, #fff);
}
.page-about__cap-card .card__summary {
  font-size: 0.95rem;
  opacity: 0.8;
  margin: 0 0 0.75rem;
}
.page-about__cap-bg,
.page-about__cap-device {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  margin-bottom: var(--space-md, 1rem);
  border-radius: var(--radius, 4px);
  border: 1px solid var(--about-gold-line);
}
.page-about__cap-detail {
  display: none;
  margin-top: 0.5rem;
  padding: 0.75rem;
  background: rgba(0,0,0,0.3);
  border-left: 3px solid var(--gold, #FFD700);
  font-size: 0.9rem;
  opacity: 0.9;
}
.page-about__cap-card[data-expand] .page-about__cap-detail {
  display: block;
}
/* 服务承诺网格 */
.page-about__promise-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--about-cap-gap);
}
.page-about__promise-item {
  background: var(--black-light, #1E1E1E);
  border: var(--about-card-border);
  padding: var(--space-lg, 2rem);
  text-align: center;
  transition: border-color 0.3s;
}
.page-about__promise-item:hover {
  border-color: var(--gold, #FFD700);
}
.page-about__promise-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 60px;
  font-size: 2.2rem;
  color: var(--gold, #FFD700);
  background: rgba(255,215,0,0.08);
  border-radius: 50%;
  margin-bottom: 1rem;
}
.page-about__promise-title {
  font-size: 1.35rem;
  font-weight: 400;
  margin: 0 0 0.5rem;
  color: var(--white, #fff);
}
.page-about__promise-item p {
  font-size: 0.95rem;
  opacity: 0.8;
  margin: 0;
}
/* CTA底部 */
.page-about__cta {
  margin-top: var(--space-xxl, 4rem);
  text-align: center;
  border-top: 1px solid rgba(255,215,0,0.2);
  padding-top: var(--space-xl, 3rem);
}
.page-about__cta p {
  font-size: 1.1rem;
  opacity: 0.75;
  margin: 0 0 var(--space-md, 1rem);
}
.page-about__cta-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
}
/* 移动端优先调整 */
@media (max-width: 768px) {
  .page-about__intro {
    flex-direction: column;
    text-align: center;
  }
  .page-about__intro-title {
    font-size: calc(var(--h1, 4rem) * 0.65);
  }
  .page-about__section {
    flex-direction: column;
  }
  .page-about__section-timeline {
    padding-left: 0;
  }
  .page-about__section-content {
    padding-left: 0;
  }
  .page-about__cap-grid,
  .page-about__promise-grid {
    flex-direction: column;
  }
  .page-about__cap-grid .grid__col--4,
  .page-about__promise-grid .grid__col--4 {
    width: 100%;
    flex: 0 0 100%;
    max-width: 100%;
  }
  .page-about__brand-icon {
    width: 120px;
    height: 120px;
  }
  .page-about__cap-device {
    max-width: 200px;
    margin-left: auto;
    margin-right: auto;
  }
}
@media (min-width: 769px) {
  .page-about__intro {
    flex-direction: row;
    text-align: left;
    justify-content: space-between;
  }
  .page-about__intro-text {
    flex: 1;
    text-align: left;
  }
  .page-about__intro-tags {
    justify-content: flex-start;
  }
  .page-about__section {
    flex-direction: row;
    gap: 2rem;
  }
  .page-about__section-timeline {
    flex: 0 0 160px;
    flex-direction: column;
    align-items: flex-start;
    padding-left: 0;
  }
  .page-about__timeline-line {
    width: var(--about-timeline-width);
    height: auto;
    flex: 1;
    min-height: 60px;
    margin-top: 0.25rem;
    align-self: flex-start;
    margin-left: 0.4rem;
  }
  .page-about__section-content {
    flex: 1;
    padding-left: 0;
  }
  .page-about__cap-grid .grid__col--4 {
    flex: 0 0 calc(33.333% - var(--about-cap-gap));
    max-width: calc(33.333% - var(--about-cap-gap));
  }
  .page-about__promise-grid .grid__col--4 {
    flex: 0 0 calc(33.333% - var(--about-cap-gap));
    max-width: calc(33.333% - var(--about-cap-gap));
  }
}
/* 桌面大屏微调 */
@media (min-width: 1200px) {
  .page-about__intro-title {
    font-size: var(--h1, 4rem);
  }
  .page-about__section-timeline .section-number__digit {
    font-size: 3rem;
  }
}