:root {
      --bg-main: #0a0814;
      --bg-card: rgba(22, 17, 38, 0.75);
      --bg-card-hover: rgba(33, 23, 56, 0.9);
      --neon-pink: #ff2a85;
      --neon-purple: #9d4edd;
      --neon-cyan: #00f0ff;
      --neon-glow: rgba(255, 42, 133, 0.35);
      --text-main: #f8f9fa;
      --text-muted: #b8b5d1;
      --border-color: rgba(157, 78, 221, 0.25);
      --border-bright: rgba(255, 42, 133, 0.5);
      --gradient-pink-purple: linear-gradient(135deg, #ff2a85 0%, #9d4edd 100%);
      --gradient-dark: linear-gradient(180deg, #0d0a1a 0%, #06040d 100%);
      --container-width: 1200px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }

    body {
      background-color: var(--bg-main);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      line-height: 1.6;
      overflow-x: hidden;
      background-image: 
        radial-gradient(circle at 15% 15%, rgba(157, 78, 221, 0.15) 0%, transparent 40%),
        radial-gradient(circle at 85% 65%, rgba(255, 42, 133, 0.12) 0%, transparent 45%),
        linear-gradient(180deg, #090614 0%, #05030a 100%);
      background-attachment: fixed;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.3s ease;
    }

    ul {
      list-style: none;
    }

    .container {
      width: 100%;
      max-width: var(--container-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(10, 8, 20, 0.88);
      backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--border-color);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }

    .brand-wrap {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .brand-wrap .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
      filter: drop-shadow(0 0 10px rgba(255, 42, 133, 0.4));
    }

    .brand-title {
      font-size: 20px;
      font-weight: 800;
      letter-spacing: 0.5px;
      background: var(--gradient-pink-purple);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }

    .nav-item {
      padding: 8px 14px;
      font-size: 14px;
      font-weight: 500;
      color: var(--text-muted);
      position: relative;
    }

    .nav-item:hover, .nav-item.active {
      color: #ffffff;
      text-shadow: 0 0 12px var(--neon-pink);
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 14px;
    }

    .btn-cyber {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 14px;
      font-weight: 600;
      border-radius: 8px;
      background: var(--gradient-pink-purple);
      color: #ffffff;
      box-shadow: 0 0 18px var(--neon-glow);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
      cursor: pointer;
      border: none;
      white-space: nowrap;
    }

    .btn-cyber:hover {
      transform: translateY(-2px);
      box-shadow: 0 0 28px rgba(255, 42, 133, 0.6);
    }

    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 20px;
      font-size: 14px;
      font-weight: 600;
      border-radius: 8px;
      background: rgba(255, 255, 255, 0.04);
      color: #ffffff;
      border: 1px solid var(--border-bright);
      transition: all 0.25s ease;
      cursor: pointer;
    }

    .btn-outline:hover {
      background: rgba(255, 42, 133, 0.15);
      border-color: var(--neon-pink);
      box-shadow: 0 0 16px rgba(255, 42, 133, 0.3);
    }

    .mobile-menu-btn {
      display: none;
      background: transparent;
      border: 1px solid var(--border-color);
      color: var(--text-main);
      padding: 8px 12px;
      border-radius: 6px;
      font-size: 18px;
      cursor: pointer;
    }

    .section-wrap {
      padding: 80px 0;
      position: relative;
    }

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

    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      font-size: 12px;
      font-weight: 700;
      letter-spacing: 1.5px;
      text-transform: uppercase;
      color: var(--neon-pink);
      background: rgba(255, 42, 133, 0.1);
      border: 1px solid rgba(255, 42, 133, 0.3);
      border-radius: 20px;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: #ffffff;
      margin-bottom: 14px;
      text-shadow: 0 0 20px rgba(157, 78, 221, 0.3);
    }

    .section-desc {
      font-size: 15px;
      color: var(--text-muted);
      max-width: 680px;
      margin: 0 auto;
    }

    /* 首屏 Hero 无图片区纯科技渲染 */
    .hero-section {
      padding: 90px 0 70px;
      position: relative;
    }

    .hero-content {
      text-align: center;
      max-width: 860px;
      margin: 0 auto 50px;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: rgba(157, 78, 221, 0.15);
      border: 1px solid rgba(157, 78, 221, 0.4);
      border-radius: 30px;
      font-size: 13px;
      color: #f170ff;
      margin-bottom: 24px;
      box-shadow: 0 0 20px rgba(157, 78, 221, 0.2);
    }

    .hero-h1 {
      font-size: 44px;
      font-weight: 900;
      line-height: 1.25;
      margin-bottom: 22px;
      letter-spacing: -0.5px;
      color: #ffffff;
      text-shadow: 0 0 35px rgba(255, 42, 133, 0.4);
    }

    .hero-h1 span {
      background: linear-gradient(135deg, #ff2a85 20%, #b5179e 60%, #00f0ff 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-sub {
      font-size: 17px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 34px;
    }

    .hero-buttons {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 18px;
      flex-wrap: wrap;
    }

    .btn-hero-primary {
      padding: 14px 34px;
      font-size: 16px;
      font-weight: 700;
      border-radius: 10px;
      background: var(--gradient-pink-purple);
      color: #ffffff;
      box-shadow: 0 0 25px rgba(255, 42, 133, 0.6);
      transition: all 0.3s;
    }

    .btn-hero-primary:hover {
      box-shadow: 0 0 40px rgba(255, 42, 133, 0.9);
      transform: translateY(-3px);
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 50px;
    }

    .stat-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 14px;
      padding: 24px 16px;
      text-align: center;
      backdrop-filter: blur(10px);
      transition: transform 0.3s, border-color 0.3s;
    }

    .stat-card:hover {
      transform: translateY(-4px);
      border-color: var(--neon-pink);
      box-shadow: 0 8px 30px rgba(255, 42, 133, 0.2);
    }

    .stat-num {
      font-size: 32px;
      font-weight: 900;
      color: #ffffff;
      font-family: monospace;
      margin-bottom: 6px;
      background: var(--gradient-pink-purple);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .stat-name {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 模型矩阵徽标流 */
    .models-bar {
      margin-top: 30px;
      background: rgba(18, 14, 30, 0.6);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 16px 20px;
    }

    .models-title {
      font-size: 12px;
      color: #9d4edd;
      text-transform: uppercase;
      margin-bottom: 12px;
      text-align: center;
      font-weight: 700;
      letter-spacing: 1px;
    }

    .models-tags {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 8px;
    }

    .model-tag {
      font-size: 11px;
      padding: 4px 10px;
      background: rgba(255, 255, 255, 0.05);
      border: 1px solid rgba(255, 42, 133, 0.2);
      border-radius: 6px;
      color: #e2e1f0;
      transition: all 0.2s;
    }

    .model-tag:hover {
      background: rgba(255, 42, 133, 0.2);
      border-color: var(--neon-pink);
      color: #ffffff;
    }

    /* 通用卡片与网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }

    .cyber-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 14px;
      padding: 28px;
      transition: all 0.3s ease;
      position: relative;
      display: flex;
      flex-direction: column;
    }

    .cyber-card:hover {
      border-color: var(--border-bright);
      background: var(--bg-card-hover);
      box-shadow: 0 10px 30px rgba(157, 78, 221, 0.2);
      transform: translateY(-4px);
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: rgba(255, 42, 133, 0.15);
      border: 1px solid rgba(255, 42, 133, 0.4);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 18px;
      color: var(--neon-pink);
      font-size: 20px;
      font-weight: 800;
    }

    .card-title {
      font-size: 19px;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 12px;
    }

    .card-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    .card-tag-list {
      margin-top: 18px;
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }

    .pill-tag {
      font-size: 11px;
      background: rgba(157, 78, 221, 0.2);
      color: #dbb2ff;
      padding: 2px 8px;
      border-radius: 4px;
    }

    /* 评测与对比模块 */
    .rating-banner {
      background: linear-gradient(135deg, rgba(255, 42, 133, 0.15), rgba(157, 78, 221, 0.2));
      border: 1px solid var(--border-bright);
      border-radius: 16px;
      padding: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 30px;
      flex-wrap: wrap;
      gap: 20px;
    }

    .rating-score {
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .score-badge {
      font-size: 46px;
      font-weight: 900;
      color: #ffffff;
      background: var(--gradient-pink-purple);
      padding: 4px 20px;
      border-radius: 12px;
      box-shadow: 0 0 20px var(--neon-glow);
    }

    .score-stars {
      color: #ffb703;
      font-size: 22px;
      letter-spacing: 3px;
    }

    .comparison-table-wrap {
      overflow-x: auto;
      border: 1px solid var(--border-color);
      border-radius: 14px;
      background: var(--bg-card);
    }

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

    .comparison-table th, .comparison-table td {
      padding: 16px 20px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 14px;
    }

    .comparison-table th {
      background: rgba(33, 23, 56, 0.9);
      color: #ffffff;
      font-weight: 700;
    }

    .comparison-table tr:hover td {
      background: rgba(255, 42, 133, 0.05);
    }

    .feature-check {
      color: #00f0ff;
      font-weight: 700;
    }

    .feature-bad {
      color: #6c757d;
    }

    /* 流程步骤 */
    .steps-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .step-box {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 14px;
      padding: 24px;
      position: relative;
    }

    .step-num {
      position: absolute;
      top: 14px;
      right: 16px;
      font-size: 28px;
      font-weight: 900;
      color: rgba(255, 42, 133, 0.2);
      font-family: monospace;
    }

    /* 客户评价卡片 */
    .testimonial-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 14px;
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 16px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 14px;
    }

    .user-avatar-circle {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--gradient-pink-purple);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: #ffffff;
    }

    /* FAQ 展开项 */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
      max-width: 900px;
      margin: 0 auto;
    }

    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 10px;
      overflow: hidden;
      transition: border-color 0.3s;
    }

    .faq-item:hover {
      border-color: var(--neon-pink);
    }

    .faq-question {
      padding: 18px 22px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
      color: #ffffff;
      user-select: none;
    }

    .faq-icon {
      color: var(--neon-pink);
      font-size: 18px;
      transition: transform 0.3s;
    }

    .faq-answer {
      display: none;
      padding: 0 22px 18px;
      color: var(--text-muted);
      font-size: 14px;
      line-height: 1.7;
    }

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

    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 案例展示区图片容器 */
    .case-img-box {
      border-radius: 10px;
      overflow: hidden;
      border: 1px solid var(--border-color);
      margin-bottom: 16px;
      aspect-ratio: 16 / 9;
      background: #110e21;
    }

    .case-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.3s;
    }

    .case-img-box:hover img {
      transform: scale(1.04);
    }

    /* 表单组件 */
    .form-box {
      background: var(--bg-card);
      border: 1px solid var(--border-bright);
      border-radius: 16px;
      padding: 36px;
      box-shadow: 0 10px 40px rgba(10, 5, 20, 0.8);
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 8px;
      color: #e2e1f0;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      background: rgba(10, 8, 20, 0.7);
      border: 1px solid var(--border-color);
      border-radius: 8px;
      color: #ffffff;
      font-size: 14px;
      outline: none;
      transition: border-color 0.25s, box-shadow 0.25s;
    }

    .form-control:focus {
      border-color: var(--neon-pink);
      box-shadow: 0 0 12px var(--neon-glow);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }

    /* 宣传与物料展示区 */
    .promo-banner-wrap {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-top: 30px;
    }

    .promo-banner-wrap img {
      border-radius: 12px;
      border: 1px solid var(--border-color);
      box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
    }

    /* 页脚 */
    .site-footer {
      background: #06040e;
      border-top: 1px solid var(--border-color);
      padding: 60px 0 30px;
      color: var(--text-muted);
      font-size: 13px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
      gap: 30px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 15px;
      margin-bottom: 16px;
      font-weight: 700;
    }

    .footer-links li {
      margin-bottom: 8px;
    }

    .footer-links a:hover {
      color: var(--neon-pink);
    }

    .qr-wrap {
      display: flex;
      align-items: center;
      gap: 16px;
      background: rgba(255, 255, 255, 0.03);
      padding: 12px;
      border-radius: 10px;
      border: 1px solid var(--border-color);
    }

    .qr-wrap img {
      width: 80px;
      height: 80px;
      border-radius: 6px;
      background: #ffffff;
      padding: 4px;
    }

    .friend-links-box {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 24px;
      margin-top: 24px;
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
      font-size: 13px;
    }

    .friend-links-box a {
      color: #9d8fb3;
    }

    .friend-links-box a:hover {
      color: #ffffff;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.06);
      padding-top: 24px;
      text-align: center;
      color: #797496;
      font-size: 12px;
    }

    /* 浮动客服挂件 */
    .floating-kefu {
      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-pink-purple);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 0 16px var(--neon-glow);
      cursor: pointer;
      position: relative;
      transition: transform 0.2s;
    }

    .float-btn:hover {
      transform: scale(1.1);
    }

    .qr-hover-card {
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #171126;
      border: 1px solid var(--border-bright);
      padding: 12px;
      border-radius: 12px;
      display: none;
      box-shadow: 0 8px 30px rgba(0,0,0,0.8);
      width: 140px;
      text-align: center;
    }

    .qr-hover-card img {
      width: 110px;
      height: 110px;
      border-radius: 6px;
      margin-bottom: 6px;
    }

    .float-btn:hover .qr-hover-card {
      display: block;
    }

    /* 响应式断点 */
    @media (max-width: 992px) {
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .hero-stats-grid { grid-template-columns: repeat(2, 1fr); }
      .steps-row { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .hero-h1 { font-size: 34px; }
      .mobile-menu-btn { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        top: 76px;
        left: 0;
        width: 100%;
        background: #0f0b1e;
        flex-direction: column;
        padding: 20px 0;
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.show {
        display: flex;
      }
      .nav-item {
        width: 100%;
        text-align: center;
        padding: 12px;
      }
    }

    @media (max-width: 640px) {
      .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
      .hero-stats-grid { grid-template-columns: 1fr; }
      .steps-row { grid-template-columns: 1fr; }
      .promo-banner-wrap { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .hero-h1 { font-size: 26px; }
      .rating-banner { flex-direction: column; text-align: center; }
      .header-actions .btn-cyber { display: none; }
    }