/* 核心基底：暗夜赛博高饱和粉紫风 (Cyberpunk Neon Pink & Dark Violet) */
    :root {
      --bg-dark: #090514;
      --bg-card: rgba(22, 14, 38, 0.7);
      --bg-card-hover: rgba(36, 22, 60, 0.85);
      --border-color: rgba(236, 72, 153, 0.25);
      --border-glow: rgba(236, 72, 153, 0.6);
      --accent-pink: #ec4899;
      --accent-purple: #a855f7;
      --accent-cyan: #06b6d4;
      --text-main: #f3e8ff;
      --text-muted: #b4a2cd;
      --text-bright: #ffffff;
      --gradient-primary: linear-gradient(135deg, #ec4899 0%, #8b5cf6 50%, #06b6d4 100%);
      --gradient-glow: linear-gradient(135deg, rgba(236, 72, 153, 0.3), rgba(139, 92, 246, 0.3));
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --shadow-neon: 0 0 25px rgba(236, 72, 153, 0.3);
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      background-color: var(--bg-dark);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      background: radial-gradient(circle at 50% 0%, #1f0c38 0%, #090514 70%);
      overflow-x: hidden;
      min-height: 100vh;
    }

    /* 全局统一容器规范 */
    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 20px;
    }

    a {
      color: var(--accent-pink);
      text-decoration: none;
      transition: all 0.3s ease;
    }

    a:hover {
      color: var(--accent-cyan);
      text-shadow: 0 0 8px rgba(6, 182, 212, 0.6);
    }

    /* 顶部导航栏 */
    .header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(9, 5, 20, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      padding: 12px 0;
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .logo-box {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .ai-page-logo {
      height: 40px;
      width: auto;
      object-fit: contain;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0 !important; /* 遵循指定约束 */
      list-style: none;
      flex-wrap: wrap;
    }

    .nav-links li {
      margin: 2px 4px;
    }

    .nav-links a {
      font-size: 13px;
      color: var(--text-muted);
      padding: 6px 10px;
      border-radius: var(--radius-sm);
      white-space: nowrap;
      transition: all 0.2s ease;
    }

    .nav-links a:hover, .nav-links a.active {
      color: var(--text-bright);
      background: rgba(236, 72, 153, 0.15);
      border: 1px solid var(--border-color);
    }

    .nav-cta {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 14px;
      font-weight: 600;
      border-radius: var(--radius-md);
      cursor: pointer;
      border: none;
      transition: all 0.3s ease;
      text-align: center;
    }

    .btn-primary {
      background: var(--gradient-primary);
      color: #fff;
      box-shadow: 0 0 15px rgba(236, 72, 153, 0.4);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 0 25px rgba(236, 72, 153, 0.7);
      color: #fff;
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--accent-purple);
      color: var(--text-bright);
    }

    .btn-outline:hover {
      background: rgba(168, 85, 247, 0.2);
      border-color: var(--accent-pink);
    }

    /* 移动端菜单开关 */
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      color: var(--text-main);
      font-size: 24px;
      cursor: pointer;
    }

    /* 模块通用样式 */
    .section {
      padding: 80px 0;
      position: relative;
    }

    .section-title-wrap {
      text-align: center;
      margin-bottom: 50px;
    }

    .section-tag {
      display: inline-block;
      padding: 4px 12px;
      background: rgba(236, 72, 153, 0.15);
      border: 1px solid var(--accent-pink);
      color: var(--accent-pink);
      border-radius: 20px;
      font-size: 12px;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-bright);
      margin-bottom: 16px;
      background: linear-gradient(180deg, #ffffff 0%, #c4b5fd 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      max-width: 700px;
      margin: 0 auto;
    }

    /* 卡片通用 */
    .cyber-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      backdrop-filter: blur(10px);
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
    }

    .cyber-card:hover {
      background: var(--bg-card-hover);
      border-color: var(--border-glow);
      transform: translateY(-4px);
      box-shadow: var(--shadow-neon);
    }

    /* 首屏 HERO (严禁出现任何图片) */
    .hero-section {
      padding: 100px 0 80px;
      text-align: center;
      position: relative;
      overflow: hidden;
    }

    .hero-section::before {
      content: '';
      position: absolute;
      top: -20%;
      left: 50%;
      transform: translateX(-50%);
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(236, 72, 153, 0.25) 0%, rgba(139, 92, 246, 0.05) 50%, transparent 70%);
      z-index: 0;
      pointer-events: none;
    }

    .hero-content {
      position: relative;
      z-index: 1;
      max-width: 900px;
      margin: 0 auto;
    }

    h1.hero-h1 {
      font-size: 42px;
      font-weight: 900;
      line-height: 1.2;
      margin-bottom: 20px;
      background: linear-gradient(135deg, #ffffff 0%, #f472b6 50%, #a855f7 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 35px;
      line-height: 1.8;
    }

    .hero-btn-group {
      display: flex;
      justify-content: center;
      gap: 16px;
      margin-bottom: 50px;
      flex-wrap: wrap;
    }

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 40px;
    }

    .stat-item {
      padding: 20px;
      background: rgba(255, 255, 255, 0.03);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: var(--radius-md);
    }

    .stat-num {
      font-size: 28px;
      font-weight: 800;
      color: var(--accent-pink);
      font-family: monospace;
    }

    .stat-label {
      font-size: 13px;
      color: var(--text-muted);
      margin-top: 5px;
    }

    /* 网格布局通用 */
    .grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
    .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
    .grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

    /* 服务能力卡片 */
    .service-icon {
      font-size: 32px;
      margin-bottom: 16px;
      display: inline-block;
      background: var(--gradient-primary);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .service-title {
      font-size: 20px;
      font-weight: 700;
      color: var(--text-bright);
      margin-bottom: 10px;
    }

    .service-desc {
      font-size: 14px;
      color: var(--text-muted);
    }

    /* 场景矩阵标签 */
    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 15px;
    }

    .tag-item {
      background: rgba(168, 85, 247, 0.15);
      border: 1px solid rgba(168, 85, 247, 0.3);
      color: var(--text-main);
      padding: 6px 12px;
      border-radius: 15px;
      font-size: 12px;
    }

    /* 评测与对比表格 */
    .score-badge-wrap {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 20px;
      background: var(--gradient-glow);
      padding: 24px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--accent-pink);
      margin-bottom: 30px;
    }

    .score-box {
      text-align: center;
    }

    .score-stars {
      color: #f59e0b;
      font-size: 24px;
    }

    .score-num {
      font-size: 42px;
      font-weight: 900;
      color: var(--text-bright);
      line-height: 1;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
    }

    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }

    .comparison-table th, .comparison-table td {
      padding: 16px;
      border-bottom: 1px solid rgba(236, 72, 153, 0.15);
    }

    .comparison-table th {
      background: rgba(236, 72, 153, 0.1);
      color: var(--text-bright);
      font-weight: 700;
    }

    .comparison-table tr:hover {
      background: rgba(255, 255, 255, 0.02);
    }

    .highlight-col {
      background: rgba(236, 72, 153, 0.08);
      color: var(--accent-pink);
      font-weight: 600;
    }

    /* 步骤流程 */
    .process-step {
      position: relative;
      text-align: center;
    }

    .step-number {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: var(--gradient-primary);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      font-weight: 800;
      margin: 0 auto 16px;
    }

    /* 图片与案例展示 */
    .ai-page-image {
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    }

    .case-card {
      display: flex;
      flex-direction: column;
      height: 100%;
    }

    .case-img-box {
      margin-bottom: 16px;
      border-radius: var(--radius-sm);
      overflow: hidden;
    }

    /* 用户评论 */
    .testimonial-card {
      font-style: normal;
    }

    .user-info {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 16px;
    }

    .user-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--gradient-primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: #fff;
    }

    .user-meta h4 {
      color: var(--text-bright);
      font-size: 15px;
    }

    .user-meta p {
      color: var(--text-muted);
      font-size: 12px;
    }

    /* FAQ 手风琴 */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      background: var(--bg-card);
      overflow: hidden;
    }

    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      color: var(--text-bright);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-answer {
      padding: 0 24px 18px;
      color: var(--text-muted);
      font-size: 14px;
      display: none;
      border-top: 1px dashed rgba(236, 72, 153, 0.15);
      margin-top: 10px;
      padding-top: 15px;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    .faq-toggle-icon {
      transition: transform 0.3s;
    }

    .faq-item.active .faq-toggle-icon {
      transform: rotate(180deg);
    }

    /* 联系表单 */
    .contact-form {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .form-group label {
      font-size: 13px;
      color: var(--text-main);
    }

    .form-control {
      background: rgba(9, 5, 20, 0.6);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 12px;
      color: var(--text-bright);
      font-size: 14px;
      outline: none;
    }

    .form-control:focus {
      border-color: var(--accent-pink);
      box-shadow: 0 0 10px rgba(236, 72, 153, 0.3);
    }

    /* 友情链接与Footer */
    .footer {
      background: #040209;
      border-top: 1px solid var(--border-color);
      padding: 60px 0 30px;
      color: var(--text-muted);
      font-size: 13px;
    }

    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 15px;
      margin-bottom: 30px;
      padding-bottom: 20px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }

    .friend-links a {
      color: var(--text-muted);
      font-size: 13px;
    }

    .footer-bottom {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 15px;
    }

    /* 浮动客服入口 */
    .floating-contact {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--gradient-primary);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 0 15px rgba(236, 72, 153, 0.5);
      cursor: pointer;
      font-size: 20px;
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .hero-stats { grid-template-columns: repeat(2, 1fr); }
      .hero-h1 { font-size: 32px; }
    }

    @media (max-width: 768px) {
      .menu-toggle { display: block; }
      .nav-links {
        display: none;
        width: 100%;
        flex-direction: column;
        align-items: flex-start;
        padding: 15px 0;
      }
      .nav-links.show { display: flex; }
      .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
      .hero-stats { grid-template-columns: 1fr 1fr; }
      .score-badge-wrap { flex-direction: column; text-align: center; }
    }