:root {
      --bg-dark: #0a0814;
      --bg-darker: #05040a;
      --bg-card: rgba(26, 18, 48, 0.7);
      --bg-card-hover: rgba(42, 28, 77, 0.85);
      --border-color: rgba(224, 86, 253, 0.25);
      --border-glow: rgba(255, 42, 162, 0.5);
      --neon-pink: #ff2a9d;
      --neon-purple: #9d4edd;
      --neon-cyan: #00f0ff;
      --text-main: #f5f3ff;
      --text-muted: #b4a7d6;
      --gradient-primary: linear-gradient(135deg, #ff2a9d 0%, #9d4edd 50%, #480ca8 100%);
      --gradient-glow: linear-gradient(90deg, #ff2a9d, #00f0ff);
      --container-width: 1200px;
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      background-color: var(--bg-dark);
      color: var(--text-main);
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, 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% 85%, rgba(255, 42, 157, 0.12) 0%, transparent 40%),
        linear-gradient(180deg, #0a0814 0%, #120b22 100%);
      background-attachment: fixed;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }

    ul {
      list-style: none;
    }

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(10, 8, 20, 0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--border-color);
      height: 72px;
      display: flex;
      align-items: center;
    }

    .nav-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

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

    .ai-page-logo {
      height: 40px;
      width: auto;
      object-fit: contain;
      filter: drop-shadow(0 0 8px rgba(255, 42, 157, 0.4));
    }

    .brand-name {
      font-size: 1.25rem;
      font-weight: 700;
      background: linear-gradient(90deg, #fff, var(--text-muted));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      letter-spacing: 0.5px;
    }

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

    .nav-link-item {
      padding: 8px 14px;
      font-size: 0.95rem;
      color: var(--text-muted);
      font-weight: 500;
      position: relative;
    }

    .nav-link-item:hover, .nav-link-item.active {
      color: #fff;
      text-shadow: 0 0 10px rgba(255, 42, 157, 0.7);
    }

    .nav-cta {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .btn-header {
      background: var(--gradient-primary);
      color: #fff;
      padding: 8px 20px;
      border-radius: 999px;
      font-size: 0.9rem;
      font-weight: 600;
      box-shadow: 0 0 15px rgba(255, 42, 157, 0.4);
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }

    .btn-header:hover {
      box-shadow: 0 0 25px rgba(255, 42, 157, 0.8);
      transform: translateY(-1px);
    }

    .mobile-menu-toggle {
      display: none;
      background: transparent;
      border: none;
      color: #fff;
      font-size: 1.5rem;
      cursor: pointer;
    }

    /* 按钮通用 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 14px 32px;
      border-radius: 8px;
      font-weight: 600;
      font-size: 1rem;
      cursor: pointer;
      transition: var(--transition);
      border: 1px solid transparent;
      text-align: center;
    }

    .btn-primary {
      background: var(--gradient-primary);
      color: #ffffff;
      box-shadow: 0 4px 20px rgba(255, 42, 157, 0.45);
    }

    .btn-primary:hover {
      box-shadow: 0 6px 28px rgba(255, 42, 157, 0.75);
      transform: translateY(-2px);
    }

    .btn-secondary {
      background: rgba(157, 78, 221, 0.15);
      color: #fff;
      border: 1px solid var(--border-color);
      backdrop-filter: blur(8px);
    }

    .btn-secondary:hover {
      background: rgba(157, 78, 221, 0.3);
      border-color: var(--neon-pink);
      box-shadow: 0 0 15px rgba(157, 78, 221, 0.4);
      transform: translateY(-2px);
    }

    /* 首屏 Hero (无图片) */
    .hero-section {
      padding: 100px 0 80px;
      position: relative;
      overflow: hidden;
      border-bottom: 1px solid rgba(224, 86, 253, 0.15);
    }

    .hero-glow-1 {
      position: absolute;
      top: -10%;
      left: 50%;
      transform: translateX(-50%);
      width: 600px;
      height: 350px;
      background: radial-gradient(ellipse, rgba(255, 42, 157, 0.25), transparent 70%);
      pointer-events: none;
      filter: blur(50px);
    }

    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
      position: relative;
      z-index: 2;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: rgba(255, 42, 157, 0.1);
      border: 1px solid var(--neon-pink);
      border-radius: 999px;
      font-size: 0.85rem;
      color: #ff85cb;
      margin-bottom: 24px;
      box-shadow: 0 0 12px rgba(255, 42, 157, 0.3);
    }

    .hero-badge::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--neon-cyan);
      box-shadow: 0 0 8px var(--neon-cyan);
    }

    .hero-title {
      font-size: 2.8rem;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 20px;
      background: linear-gradient(135deg, #ffffff 30%, #ff85cb 70%, #00f0ff 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      letter-spacing: -0.5px;
    }

    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 760px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }

    .hero-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 20px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 32px;
    }

    .stat-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 20px;
      text-align: center;
      position: relative;
      overflow: hidden;
      transition: var(--transition);
    }

    .stat-card:hover {
      border-color: var(--neon-pink);
      transform: translateY(-4px);
      box-shadow: 0 8px 24px rgba(255, 42, 157, 0.2);
    }

    .stat-card::after {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--gradient-glow);
    }

    .stat-num {
      font-size: 1.85rem;
      font-weight: 800;
      color: #fff;
      display: block;
      margin-bottom: 6px;
      background: linear-gradient(90deg, #fff, #ff85cb);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .stat-label {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* 区域通用样式 */
    .section {
      padding: 88px 0;
      position: relative;
    }

    .section-darker {
      background: rgba(5, 4, 10, 0.6);
      border-top: 1px solid rgba(224, 86, 253, 0.1);
      border-bottom: 1px solid rgba(224, 86, 253, 0.1);
    }

    .section-header {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 56px;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.8rem;
      text-transform: uppercase;
      font-weight: 700;
      letter-spacing: 2px;
      color: var(--neon-cyan);
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }

    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 卡片网格 */
    .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: 32px;
      align-items: center;
    }

    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 14px;
      padding: 28px;
      transition: var(--transition);
      position: relative;
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }

    .feature-card:hover {
      background: var(--bg-card-hover);
      border-color: var(--neon-pink);
      transform: translateY(-5px);
      box-shadow: 0 12px 30px rgba(157, 78, 221, 0.25);
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: rgba(255, 42, 157, 0.15);
      border: 1px solid rgba(255, 42, 157, 0.4);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      color: #fff;
      margin-bottom: 20px;
      box-shadow: 0 0 15px rgba(255, 42, 157, 0.2);
    }

    .card-title {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: #fff;
    }

    .card-desc {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    .card-footer-tag {
      margin-top: 18px;
      padding-top: 14px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 0.8rem;
      color: var(--neon-cyan);
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    /* 场景标签矩阵 */
    .models-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 32px;
    }

    .model-tag {
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(224, 86, 253, 0.2);
      border-radius: 6px;
      padding: 6px 14px;
      font-size: 0.85rem;
      color: #d1c4e9;
      transition: var(--transition);
    }

    .model-tag:hover {
      background: rgba(255, 42, 157, 0.2);
      border-color: var(--neon-pink);
      color: #fff;
      transform: translateY(-2px);
    }

    /* 图文混排 */
    .img-showcase-box {
      border-radius: 16px;
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: 0 16px 40px rgba(0, 0, 0, 0.5);
      position: relative;
    }

    .img-showcase-box img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.5s ease;
    }

    .img-showcase-box:hover img {
      transform: scale(1.03);
    }

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

    .step-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 24px;
      position: relative;
    }

    .step-number {
      font-size: 2rem;
      font-weight: 800;
      color: rgba(255, 42, 157, 0.3);
      line-height: 1;
      margin-bottom: 12px;
    }

    .step-title {
      font-size: 1.1rem;
      font-weight: 700;
      color: #fff;
      margin-bottom: 8px;
    }

    .step-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 评测与对比表格 */
    .eval-overview-card {
      background: linear-gradient(135deg, rgba(157, 78, 221, 0.2), rgba(255, 42, 157, 0.2));
      border: 1px solid var(--neon-pink);
      border-radius: 16px;
      padding: 36px;
      text-align: center;
      margin-bottom: 40px;
      box-shadow: 0 0 30px rgba(255, 42, 157, 0.15);
    }

    .eval-score-num {
      font-size: 4rem;
      font-weight: 900;
      color: #fff;
      line-height: 1;
      background: linear-gradient(90deg, #ff2a9d, #00f0ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .eval-stars {
      color: #ffb703;
      font-size: 1.4rem;
      margin: 10px 0;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      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(224, 86, 253, 0.12);
      font-size: 0.95rem;
    }

    .comparison-table th {
      background: rgba(10, 8, 20, 0.9);
      color: #fff;
      font-weight: 600;
    }

    .comparison-table td:nth-child(2) {
      color: #00f0ff;
      font-weight: 600;
      background: rgba(255, 42, 157, 0.05);
    }

    .badge-check {
      color: #00f0ff;
      font-weight: bold;
    }

    /* FAQ 折叠面板 */
    .faq-list {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }

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

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

    .faq-header {
      padding: 18px 22px;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }

    .faq-question {
      font-size: 1rem;
      font-weight: 600;
      color: #fff;
    }

    .faq-arrow {
      font-size: 0.85rem;
      color: var(--neon-pink);
      transition: transform 0.3s ease;
    }

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

    .faq-body {
      display: none;
      padding: 0 22px 18px;
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      margin-top: 6px;
    }

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

    /* 评论卡片 */
    .testimonial-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .testimonial-meta {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

    .user-avatar-tag {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, #ff2a9d, #9d4edd);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: #fff;
      font-size: 1.1rem;
    }

    .user-info h4 {
      font-size: 1rem;
      color: #fff;
    }

    .user-info span {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    .testimonial-text {
      font-size: 0.92rem;
      color: #e2d9f3;
      line-height: 1.6;
    }

    /* 表单模块 */
    .form-wrapper {
      background: var(--bg-card);
      border: 1px solid var(--neon-pink);
      border-radius: 16px;
      padding: 40px;
      max-width: 800px;
      margin: 0 auto;
      box-shadow: 0 10px 40px rgba(255, 42, 157, 0.15);
    }

    .form-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
      margin-bottom: 20px;
    }

    .form-group-full {
      grid-column: span 2;
    }

    .form-label {
      display: block;
      font-size: 0.9rem;
      color: #d1c4e9;
      margin-bottom: 8px;
    }

    .form-control {
      width: 100%;
      background: rgba(10, 8, 20, 0.7);
      border: 1px solid var(--border-color);
      border-radius: 8px;
      padding: 12px 16px;
      color: #fff;
      font-size: 0.95rem;
      outline: none;
      transition: var(--transition);
    }

    .form-control:focus {
      border-color: var(--neon-cyan);
      box-shadow: 0 0 12px rgba(0, 240, 255, 0.3);
    }

    select.form-control option {
      background: var(--bg-dark);
      color: #fff;
    }

    /* 联系渠道展示 */
    .contact-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 48px;
    }

    .contact-box {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 24px;
      text-align: center;
    }

    .qr-container {
      width: 130px;
      height: 130px;
      margin: 16px auto;
      padding: 6px;
      background: #fff;
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .qr-container img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    /* 行业资讯/文章列表 */
    .article-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
      margin-top: 24px;
    }

    .article-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 14px 20px;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 8px;
      transition: var(--transition);
    }

    .article-item:hover {
      border-color: var(--neon-pink);
      transform: translateX(4px);
    }

    .article-item a {
      color: #e2d9f3;
      font-size: 0.95rem;
    }

    .article-item a:hover {
      color: #00f0ff;
    }

    /* 页脚与友情链接 */
    .site-footer {
      background: var(--bg-darker);
      border-top: 1px solid var(--border-color);
      padding: 60px 0 24px;
      color: var(--text-muted);
      font-size: 0.9rem;
    }

    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-desc {
      margin-top: 16px;
      max-width: 400px;
      line-height: 1.6;
    }

    .footer-col h4 {
      color: #fff;
      font-size: 1.05rem;
      margin-bottom: 18px;
      position: relative;
      padding-bottom: 8px;
    }

    .footer-col h4::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      width: 28px;
      height: 2px;
      background: var(--neon-pink);
    }

    .footer-links-list li {
      margin-bottom: 10px;
    }

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

    .friend-links-box {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding: 24px 0;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 16px;
    }

    .friend-links-box span {
      color: #fff;
      font-weight: 600;
    }

    .friend-links-box a {
      color: var(--text-muted);
      font-size: 0.85rem;
    }

    .friend-links-box a:hover {
      color: var(--neon-cyan);
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 24px;
      text-align: center;
      font-size: 0.82rem;
      color: #7b6f96;
    }

    /* 浮动客服 */
    .floating-service {
      position: fixed;
      right: 24px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .float-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: var(--gradient-primary);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      box-shadow: 0 4px 16px rgba(255, 42, 157, 0.4);
      cursor: pointer;
      border: 1px solid rgba(255, 255, 255, 0.2);
      transition: var(--transition);
    }

    .float-btn:hover {
      transform: scale(1.1);
      box-shadow: 0 6px 20px rgba(255, 42, 157, 0.8);
    }

    /* 响应式调整 */
    @media (max-width: 1024px) {
      .grid-4, .step-list {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .faq-list {
        grid-template-columns: 1fr;
      }
      .footer-top {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: var(--bg-darker);
        flex-direction: column;
        align-items: stretch;
        border-bottom: 1px solid var(--border-color);
        padding: 16px 0;
      }
      .nav-links.active {
        display: flex;
      }
      .nav-link-item {
        padding: 12px 24px;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .hero-title {
        font-size: 2rem;
      }
      .hero-stats {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .grid-4, .grid-2, .contact-grid, .footer-top {
        grid-template-columns: 1fr;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .form-group-full {
        grid-column: span 1;
      }
      .form-wrapper {
        padding: 24px;
      }
    }