/* — 页面专属：品牌概况 .page-about — */
.page-about {
  --_gap: 2rem;
  --_radius: 8px;
  --_card-bg: var(--color-surface, #1A2F4F);
  --_border-accent: var(--color-secondary, #00FF88);
  display: block;
}

/* 面包屑 */
.page-about__breadcrumb {
  font-family: var(--font-body, 'Roboto Condensed', sans-serif);
  font-size: 0.875rem;
  color: var(--color-text-muted, #B0C4DE);
  margin-bottom: 1.5rem;
}
.page-about__breadcrumb a {
  color: var(--color-text-muted, #B0C4DE);
  text-decoration: none;
  transition: color 0.2s;
}
.page-about__breadcrumb a:hover,
.page-about__breadcrumb a:focus-visible {
  color: var(--color-secondary, #00FF88);
}
.page-about__breadcrumb-sep {
  margin: 0 0.5rem;
}

/* 品牌使命 */
.page-about__mission {
  padding: 3rem var(--gutter, 1rem) 2rem;
  background: var(--gradient-main, linear-gradient(135deg,#0A1F3F 0%,#1A2F4F 100%));
}
.page-about__mission-container {
  max-width: var(--max-width, 1280px);
  margin: 0 auto;
}
.page-about__mission-layout {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.page-about__mission-text {
  flex: 1 1 55%;
}
.page-about__mission-text .section-title {
  margin-top: 0;
  font-size: 2rem;
}
.page-about__mission-lead {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--color-secondary, #00FF88);
  margin: 1rem 0 0.75rem;
}
.page-about__mission-text p {
  max-width: 60ch;
  line-height: 1.6;
}
.page-about__link-accent {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.5rem 1.25rem;
  background: var(--color-accent, #FF6B35);
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  border-radius: var(--radius, 4px);
  transition: background 0.2s, transform 0.2s;
}
.page-about__link-accent:hover,
.page-about__link-accent:focus-visible {
  background: #e55a2b;
  transform: translateY(-2px);
}
.page-about__mission-image-wrap {
  flex: 1 1 45%;
  overflow: hidden;
  border-radius: var(--radius-card, 8px);
  box-shadow: var(--shadow-card, 0 8px 32px rgba(0,0,0,0.3));
}
.page-about__mission-img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 320px;
  object-fit: cover;
  object-position: center;
}

/* 服务范围 — 时间线 */
.page-about__services {
  padding: 2rem var(--gutter, 1rem);
}
.page-about__services-intro {
  color: var(--color-text-muted, #B0C4DE);
  margin-bottom: 2rem;
  font-size: 1.1rem;
}
.page-about__timeline {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  position: relative;
}
/* 垂直线条 */
.page-about__timeline::before {
  content: '';
  position: absolute;
  left: 3rem;
  top: 2rem;
  bottom: 2rem;
  width: 3px;
  background: var(--color-secondary, #00FF88);
  opacity: 0.4;
}
.page-about__timeline-item {
  background: var(--_card-bg);
  border-radius: var(--_radius);
  padding: 0.75rem 1rem 0.75rem 5rem;
  position: relative;
  border: 1px solid transparent;
  transition: border-color 0.3s, box-shadow 0.3s;
}
.page-about__timeline-item[open] {
  border-color: var(--_border-accent);
  box-shadow: 0 0 12px rgba(0, 255, 136, 0.2);
}
.page-about__timeline-summary {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
  list-style: none;
  font-weight: 700;
  font-size: 1.15rem;
}
.page-about__timeline-summary::-webkit-details-marker {
  display: none;
}
.page-about__timeline-icon {
  flex-shrink: 0;
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  overflow: hidden;
  border: 2px solid var(--_border-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary, #0A1F3F);
  position: absolute;
  left: 0.75rem;
  top: 0.75rem;
}
.page-about__timeline-icon img {
  width: 2rem;
  height: 2rem;
  object-fit: contain;
}
.page-about__timeline-step {
  color: var(--color-text, #fff);
}
.page-about__timeline-detail {
  margin-top: 0.75rem;
  padding-left: 0.5rem;
  border-left: 2px solid var(--color-accent, #FF6B35);
  color: var(--color-text-muted, #B0C4DE);
  line-height: 1.5;
}
.page-about__services-leagues {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}
.page-about__league-tag {
  display: inline-block;
  padding: 0.3rem 0.8rem;
  font-size: 0.85rem;
  font-weight: 700;
  background: var(--_card-bg);
  border: 1px solid var(--_border-accent);
  border-radius: 999px;
  color: var(--color-text, #fff);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* 技术优势 */
.page-about__tech {
  padding: 2rem var(--gutter, 1rem);
  background: rgba(26, 47, 79, 0.5);
  backdrop-filter: blur(4px);
}
.page-about__tech-layout {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  max-width: var(--max-width, 1280px);
  margin: 0 auto;
}
.page-about__tech-text {
  flex: 1 1 55%;
}
.page-about__tech-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0;
}
.page-about__tech-list li {
  position: relative;
  padding-left: 1.75rem;
  margin-bottom: 0.75rem;
  line-height: 1.5;
}
.page-about__tech-list li::before {
  content: '▶';
  position: absolute;
  left: 0;
  color: var(--color-accent, #FF6B35);
  font-size: 0.9rem;
}
.page-about__tech-image-wrap {
  flex: 1 1 45%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.page-about__tech-img {
  width: 100%;
  max-width: 300px;
  height: auto;
  border-radius: var(--radius-card, 8px);
  box-shadow: var(--shadow-card, 0 8px 32px rgba(0,0,0,0.3));
  object-fit: cover;
}

/* 联系我们 */
.page-about__contact {
  padding: 2rem var(--gutter, 1rem) 3rem;
}
.page-about__contact-card {
  background: var(--_card-bg);
  border-radius: var(--radius-card, 8px);
  padding: 1.5rem;
  border: 1px solid rgba(255, 107, 53, 0.3);
  box-shadow: var(--shadow-card, 0 8px 32px rgba(0,0,0,0.3));
  max-width: 600px;
}
.page-about__contact-note {
  color: var(--color-text-muted, #B0C4DE);
  font-style: italic;
  margin-bottom: 1rem;
}
.page-about__contact-list {
  list-style: none;
  padding: 0;
  margin: 1rem 0;
}
.page-about__contact-list li {
  margin-bottom: 0.5rem;
  line-height: 1.6;
}
.page-about__contact-list a {
  color: var(--color-secondary, #00FF88);
  text-decoration: none;
}
.page-about__contact-list a:hover {
  text-decoration: underline;
}
.page-about__contact-footnote {
  font-size: 0.8rem;
  color: var(--color-text-muted, #B0C4DE);
  margin-top: 0.75rem;
  opacity: 0.8;
}

/* 滚动显现 */
.page-about .scroll-reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.page-about .scroll-reveal--visible {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .page-about .scroll-reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* 移动端优先 — 桌面增强 */
@media (min-width: 768px) {
  .page-about__mission {
    padding: 4rem var(--gutter, 1rem) 3rem;
  }
  .page-about__mission-layout {
    flex-direction: row;
    align-items: center;
  }
  .page-about__mission-text .section-title {
    font-size: 2.5rem;
  }
  .page-about__mission-img {
    max-height: 400px;
  }
  .page-about__timeline::before {
    left: 4rem;
  }
  .page-about__timeline-item {
    padding-left: 6rem;
  }
  .page-about__timeline-icon {
    width: 4rem;
    height: 4rem;
    left: 1rem;
    top: 1rem;
  }
  .page-about__timeline-icon img {
    width: 2.5rem;
    height: 2.5rem;
  }
  .page-about__tech-layout {
    flex-direction: row;
    align-items: center;
  }
  .page-about__tech-text {
    order: 1;
  }
  .page-about__tech-image-wrap {
    order: 2;
  }
}
@media (min-width: 1024px) {
  .page-about__mission-text {
    padding-right: 3rem;
  }
  .page-about__tech-text {
    padding-right: 3rem;
  }
}