/* ===== 页面专属：关于竞界 (page-about) ===== */
.page-about {
  --about-timeline-width: 220px;
  --about-timeline-color: rgba(138, 43, 226, 0.35);
  --about-node-size: 20px;
  --about-accent-glow: 0 0 12px rgba(138, 43, 226, 0.5);
  --about-highlight-glow: 0 0 20px rgba(57, 255, 20, 0.4);
  display: block;
  width: 100%;
  background-color: var(--color-bg, #0A0E27);
  color: var(--color-text, #B0C4DE);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  padding-top: calc(var(--header-height, 70px) + 1rem);
  padding-bottom: 0.5rem;
  font-size: 0.85rem;
}
.page-about .breadcrumb-link {
  color: var(--color-link, #8A2BE2);
  text-decoration: none;
  transition: color var(--transition-fast, 0.2s ease);
}
.page-about .breadcrumb-link:hover,
.page-about .breadcrumb-link:focus-visible {
  color: var(--color-accent2, #39FF14);
  outline: none;
}
.page-about .breadcrumb-separator {
  color: var(--color-border, rgba(138, 43, 226, 0.5));
  user-select: none;
}
.page-about .breadcrumb-current {
  color: var(--color-title, #E0E8F0);
  font-weight: 600;
}

/* ---------- Hero 首屏 ---------- */
.page-about .about-hero {
  padding: 2.5rem 0 3rem;
  position: relative;
}
.page-about .about-hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 5%;
  right: 5%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent1, #8A2BE2), transparent);
  opacity: 0.4;
}
.page-about .about-hero-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
}
.page-about .about-hero-visual {
  flex-shrink: 0;
  max-width: 300px;
  width: 100%;
}
.page-about .hero-image {
  width: 100%;
  height: auto;
  max-width: 500px;
  display: block;
  border-radius: 6px;
  clip-path: polygon(0 0, 100% 0, 96% 100%, 0 96%);
  box-shadow: var(--about-accent-glow);
}
.page-about .about-hero-text {
  flex: 1;
  text-align: center;
}
.page-about .hero-heading {
  font-family: var(--font-family, 'Inter', 'Roboto', sans-serif);
  font-weight: var(--font-weight-heading, 900);
  font-size: clamp(2rem, 5vw, 3.6rem);
  line-height: 1.1;
  background: linear-gradient(135deg, #8A2BE2, #39FF14);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin: 0 0 1rem;
}
.page-about .hero-subtitle {
  font-size: 1.15rem;
  line-height: 1.6;
  color: var(--color-title, #E0E8F0);
  max-width: 680px;
  margin: 0 auto 1rem;
}
.page-about .hero-desc {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--color-text, #B0C4DE);
  max-width: 620px;
  margin: 0 auto;
}

/* ---------- 主体区域（时间轴 + 内容） ---------- */
.page-about .about-main {
  padding: 3rem 0 2rem;
}
.page-about .about-main-inner {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  position: relative;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  width: 100%;
  padding: 0.5rem 0 1rem;
}
.page-about .timeline-track {
  display: flex;
  flex-direction: row;
  overflow-x: auto;
  gap: 1rem;
  padding: 0.5rem 0 1rem;
  scrollbar-width: thin;
  scrollbar-color: var(--color-accent1, #8A2BE2) transparent;
  -webkit-overflow-scrolling: touch;
  position: relative;
}
.page-about .timeline-track::-webkit-scrollbar {
  height: 4px;
}
.page-about .timeline-track::-webkit-scrollbar-thumb {
  background: var(--color-accent1, #8A2BE2);
  border-radius: 4px;
}
.page-about .timeline-node {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  padding: 0.75rem 1rem 0.5rem;
  background: var(--color-surface, #1A1F3D);
  border: 1px solid var(--color-border, rgba(138, 43, 226, 0.5));
  border-radius: 6px;
  min-width: 110px;
  position: relative;
  cursor: default;
  transition: border-color var(--transition-fast, 0.2s ease), box-shadow var(--transition-fast, 0.2s ease);
}
.page-about .timeline-node:hover,
.page-about .timeline-node:focus-within {
  border-color: var(--color-accent1, #8A2BE2);
  box-shadow: var(--about-accent-glow);
}
.page-about .timeline-node.highlight {
  border-color: var(--color-accent2, #39FF14);
  box-shadow: var(--about-highlight-glow);
}
.page-about .timeline-node.highlight:hover {
  box-shadow: 0 0 28px rgba(57, 255, 20, 0.5);
}
.page-about .node-marker {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-accent1, #8A2BE2);
  flex-shrink: 0;
  transition: transform var(--transition-fast, 0.2s ease), background var(--transition-fast, 0.2s ease);
}
.page-about .timeline-node:hover .node-marker {
  transform: scale(1.3);
  background: var(--color-accent2, #39FF14);
}
.page-about .timeline-node.highlight .node-marker {
  background: var(--color-accent2, #39FF14);
  box-shadow: 0 0 10px rgba(57, 255, 20, 0.6);
}
.page-about .node-date {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-accent1, #8A2BE2);
  letter-spacing: 0.5px;
  text-transform: uppercase;
}
.page-about .node-label {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-title, #E0E8F0);
}
.page-about .node-detail {
  display: none;
  font-size: 0.75rem;
  color: var(--color-text, #B0C4DE);
  text-align: center;
  max-width: 130px;
}
.page-about .timeline-node:hover .node-detail {
  display: block;
}
.page-about .timeline-caption {
  text-align: center;
  font-size: 0.75rem;
  color: var(--color-text, #B0C4DE);
  opacity: 0.6;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-top: 0.25rem;
}

/* ---------- 内容区 ---------- */
.page-about .about-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 3rem;
}
.page-about .content-block {
  scroll-margin-top: calc(var(--header-height, 70px) + 1rem);
}
.page-about .block-header {
  margin-bottom: 1.5rem;
  position: relative;
}
.page-about .block-header::before {
  content: '';
  display: block;
  width: 48px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent1, #8A2BE2), var(--color-accent2, #39FF14));
  margin-bottom: 0.75rem;
  border-radius: 2px;
}
.page-about .block-heading {
  font-family: var(--font-family, 'Inter', 'Roboto', sans-serif);
  font-weight: var(--font-weight-heading, 900);
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  line-height: 1.2;
  color: var(--color-title, #E0E8F0);
  margin: 0 0 0.6rem;
  background: linear-gradient(135deg, #8A2BE2, #39FF14);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.page-about .block-intro {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text, #B0C4DE);
  max-width: 580px;
}
.page-about .block-body {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ---------- 服务列表（我们做什么） ---------- */
.page-about .service-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.page-about .service-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem;
  background: var(--color-surface, #1A1F3D);
  border-left: 3px solid var(--color-accent1, #8A2BE2);
  border-radius: 0 6px 6px 0;
  transition: border-color var(--transition-fast, 0.2s ease), background var(--transition-fast, 0.2s ease);
}
.page-about .service-item:hover {
  border-left-color: var(--color-accent2, #39FF14);
  background: rgba(26, 31, 61, 0.8);
}
.page-about .service-icon {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(138, 43, 226, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  color: var(--color-accent1, #8A2BE2);
  transition: background var(--transition-fast, 0.2s ease), color var(--transition-fast, 0.2s ease);
}
.page-about .service-item:hover .service-icon {
  background: rgba(57, 255, 20, 0.2);
  color: var(--color-accent2, #39FF14);
}
.page-about .service-icon[data-icon="list"]::after { content: "☰"; }
.page-about .service-icon[data-icon="bookmark"]::after { content: "★"; }
.page-about .service-icon[data-icon="device"]::after { content: "▦"; }
.page-about .service-icon[data-icon="sync"]::after { content: "⇄"; }
.page-about .service-icon[data-icon="download"]::after { content: "↓"; }
.page-about .service-text {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}
.page-about .service-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-title, #E0E8F0);
}
.page-about .service-desc {
  font-size: 0.88rem;
  color: var(--color-text, #B0C4DE);
  line-height: 1.5;
}
.page-about .block-visual {
  width: 100%;
  max-width: 600px;
  margin: 0 auto;
}
.page-about .visual-img {
  width: 100%;
  height: auto;
  max-width: 100%;
  display: block;
  border-radius: 6px;
  clip-path: polygon(0 0, 100% 0, 98% 100%, 0 94%);
  box-shadow: var(--about-accent-glow);
}

/* ---------- 为什么选择J9 ---------- */
.page-about .why-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}
.page-about .why-card {
  background: var(--color-surface, #1A1F3D);
  padding: 1.5rem;
  border-radius: 6px;
  position: relative;
  border: 1px solid transparent;
  transition: border-color var(--transition-fast, 0.2s ease), box-shadow var(--transition-fast, 0.2s ease);
}
.page-about .why-card:hover {
  border-color: var(--color-border, rgba(138, 43, 226, 0.5));
  box-shadow: var(--about-accent-glow);
}
.page-about .why-number {
  display: inline-block;
  font-size: 2rem;
  font-weight: 900;
  line-height: 1;
  background: linear-gradient(135deg, #8A2BE2, #39FF14);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 0.5rem;
  opacity: 0.7;
}
.page-about .why-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-title, #E0E8F0);
  margin: 0 0 0.4rem;
}
.page-about .why-text {
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--color-text, #B0C4DE);
  margin: 0;
}

/* ---------- 技术优势 ---------- */
.page-about .tech-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}
.page-about .tech-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1rem;
  background: var(--color-surface, #1A1F3D);
  border-radius: 6px;
  transition: background var(--transition-fast, 0.2s ease);
}
.page-about .tech-item:hover {
  background: rgba(26, 31, 61, 0.7);
}
.page-about .tech-icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: 6px;
  background: rgba(138, 43, 226, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: var(--color-accent1, #8A2BE2);
  transition: background var(--transition-fast, 0.2s ease), color var(--transition-fast, 0.2s ease);
}
.page-about .tech-item:hover .tech-icon {
  background: rgba(57, 255, 20, 0.15);
  color: var(--color-accent2, #39FF14);
}
.page-about .tech-icon[data-icon="sync-alt"]::after { content: "⟳"; }
.page-about .tech-icon[data-icon="layer"]::after { content: "▤"; }
.page-about .tech-icon[data-icon="table"]::after { content: "⊞"; }
.page-about .tech-icon[data-icon="responsive"]::after { content: "▭"; }
.page-about .tech-info {
  flex: 1;
}
.page-about .tech-name {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-title, #E0E8F0);
  margin: 0 0 0.2rem;
}
.page-about .tech-desc {
  font-size: 0.88rem;
  line-height: 1.5;
  color: var(--color-text, #B0C4DE);
  margin: 0;
}
.page-about .tech-visual {
  margin-top: 0.5rem;
}

/* ---------- CTA 区域 ---------- */
.page-about .about-cta {
  padding: 3rem 0 4rem;
  position: relative;
}
.page-about .about-cta::before {
  content: '';
  position: absolute;
  top: 0;
  left: 5%;
  right: 5%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent1, #8A2BE2), transparent);
  opacity: 0.3;
}
.page-about .cta-content {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
}
.page-about .cta-text {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-title, #E0E8F0);
  margin: 0;
}
.page-about .cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}
.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.6rem;
  font-family: var(--font-family, 'Inter', 'Roboto', sans-serif);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border-radius: 6px;
  transition: all var(--transition-fast, 0.2s ease);
  cursor: pointer;
  border: 1px solid var(--color-border, rgba(138, 43, 226, 0.5));
  background: transparent;
  color: var(--color-text, #B0C4DE);
}
.page-about .btn:hover,
.page-about .btn:focus-visible {
  border-color: var(--color-accent2, #39FF14);
  color: var(--color-accent2, #39FF14);
  box-shadow: 0 0 12px rgba(57, 255, 20, 0.25);
  outline: none;
}
.page-about .btn-primary {
  background: var(--color-accent1, #8A2BE2);
  border-color: var(--color-accent1, #8A2BE2);
  color: #fff;
  box-shadow: 0 0 12px rgba(138, 43, 226, 0.35);
}
.page-about .btn-primary:hover,
.page-about .btn-primary:focus-visible {
  background: var(--color-accent2, #39FF14);
  border-color: var(--color-accent2, #39FF14);
  color: #0A0E27;
  box-shadow: 0 0 20px rgba(57, 255, 20, 0.4);
}

/* ---------- 桌面端 (min-width: 768px) ---------- */
@media (min-width: 768px) {
  .page-about .about-hero-inner {
    flex-direction: row;
    text-align: left;
    align-items: center;
  }
  .page-about .about-hero-visual {
    max-width: 360px;
  }
  .page-about .about-hero-text {
    text-align: left;
  }
  .page-about .hero-subtitle,
  .page-about .hero-desc {
    margin-left: 0;
    margin-right: 0;
  }
  .page-about .why-grid {
    grid-template-columns: 1fr 1fr;
  }
  .page-about .tech-grid {
    grid-template-columns: 1fr 1fr;
  }
  .page-about .block-body {
    flex-direction: row;
    align-items: flex-start;
    gap: 2rem;
  }
  .page-about .block-body .service-list {
    flex: 1;
  }
  .page-about .block-visual {
    flex-shrink: 0;
    max-width: 400px;
  }
  .page-about .tech-visual {
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
  }
  .page-about .about-main-inner {
    flex-direction: row;
    gap: 2.5rem;
  }
  .page-about .about-timeline {
    width: var(--about-timeline-width);
    flex-shrink: 0;
    position: sticky;
    top: calc(var(--header-height, 70px) + 1rem);
    align-self: flex-start;
    padding: 1rem 0 2rem;
  }
  .page-about .timeline-track {
    flex-direction: column;
    overflow-x: visible;
    gap: 0;
    padding: 0;
    position: relative;
  }
  .page-about .timeline-track::before {
    content: '';
    position: absolute;
    top: 24px;
    bottom: 24px;
    left: 10px;
    width: 2px;
    background: repeating-linear-gradient(
      45deg,
      var(--color-accent1, #8A2BE2) 0px,
      var(--color-accent1, #8A2BE2) 4px,
      transparent 4px,
      transparent 8px
    );
    opacity: 0.4;
  }
  .page-about .timeline-node {
    flex-direction: row;
    align-items: center;
    gap: 0.75rem;
    min-width: auto;
    padding: 0.75rem 1rem;
    background: transparent;
    border: none;
    border-radius: 0;
    border-left: 2px solid transparent;
    cursor: pointer;
    transition: border-color var(--transition-fast, 0.2s ease), background var(--transition-fast, 0.2s ease);
  }
  .page-about .timeline-node:hover,
  .page-about .timeline-node:focus-within {
    background: rgba(138, 43, 226, 0.08);
    border-left-color: var(--color-accent1, #8A2BE2);
    box-shadow: none;
  }
  .page-about .timeline-node.highlight {
    border-left-color: var(--color-accent2, #39FF14);
    background: rgba(57, 255, 20, 0.05);
    box-shadow: none;
  }
  .page-about .node-marker {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    z-index: 1;
    position: relative;
  }
  .page-about .node-date {
    min-width: 52px;
    font-size: 0.72rem;
  }
  .page-about .node-label {
    font-size: 0.85rem;
    white-space: nowrap;
  }
  .page-about .node-detail {
    display: none;
    position: absolute;
    left: calc(100% + 12px);
    top: 50%;
    transform: translateY(-50%);
    background: var(--color-surface, #1A1F3D);
    border: 1px solid var(--color-border, rgba(138, 43, 226, 0.5));
    padding: 0.5rem 0.75rem;
    border-radius: 4px;
    white-space: nowrap;
    z-index: 10;
    font-size: 0.8rem;
    color: var(--color-title, #E0E8F0);
    box-shadow: 0 4px 16px rgba(0,0,0,0.5);
  }
  .page-about .timeline-node:hover .node-detail {
    display: block;
  }
  .page-about .timeline-caption {
    text-align: left;
    padding-left: 2.2rem;
    margin-top: 0.75rem;
  }
  .page-about .about-content {
    flex: 1;
    min-width: 0;
  }
  .page-about .about-cta {
    padding: 3.5rem 0 5rem;
  }
}

/* ---------- 大桌面端 (min-width: 1024px) ---------- */
@media (min-width: 1024px) {
  .page-about .about-hero-visual {
    max-width: 420px;
  }
  .page-about .block-body .block-visual {
    max-width: 480px;
  }
  .page-about .why-grid {
    gap: 1.25rem;
  }
  .page-about .tech-grid {
    gap: 1.25rem;
  }
  .page-about .about-main {
    padding: 4rem 0 3rem;
  }
}

/* ---------- 容器工具（用于 .container 已在全局定义，此处补充作用域限定） ---------- */
.page-about .container {
  max-width: var(--max-width, 1200px);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

/* ---------- 动画钩子（仅占位，实际动效由JS增强） ---------- */
.page-about [data-animate="slide-in"] {
  opacity: 1;
  transform: none;
}

/* ---------- 联系邮箱复制提示（交互钩子） ---------- */
.page-about [data-copy] {
  cursor: pointer;
}

/* ---------- 去除全局链接默认样式干扰 ---------- */
.page-about a {
  text-decoration: none;
}

/* ---------- 确保所有图片响应式 ---------- */
.page-about img {
  max-width: 100%;
  height: auto;
  object-fit: cover;
}