:root {
      --bg-main: #0a0614;
      --bg-card: #140d28;
      --bg-card-hover: #1f143d;
      --bg-accent: #231245;
      --primary-pink: #ff2d87;
      --primary-purple: #8b2df0;
      --neon-cyan: #00f0ff;
      --text-main: #ffffff;
      --text-muted: #b8b1d1;
      --border-color: rgba(255, 45, 135, 0.25);
      --border-glow: rgba(139, 45, 240, 0.4);
      --glow-pink: 0 0 20px rgba(255, 45, 135, 0.4);
      --glow-purple: 0 0 25px rgba(139, 45, 240, 0.5);
      --container-width: 1200px;
    }

    * {
      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-main);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      background: radial-gradient(circle at 50% 0%, #2a114d 0%, #0a0614 60%, #05030a 100%);
      min-height: 100vh;
      overflow-x: hidden;
    }

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

    ul, ol {
      list-style: none;
    }

    .container {
      width: 100%;
      max-width: var(--container-width);
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(10, 6, 20, 0.85);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
    }

    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }

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

    .brand-logo-wrap .ai-page-logo {
      height: 38px;
      width: auto;
      object-fit: contain;
    }

    .brand-name {
      font-size: 1.25rem;
      font-weight: 700;
      background: linear-gradient(90deg, #ff2d87, #00f0ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      letter-spacing: 0.5px;
    }

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

    .nav-item {
      display: inline-block;
      padding: 8px 14px;
      font-size: 0.92rem;
      color: var(--text-muted);
      font-weight: 500;
      transition: color 0.3s ease;
    }

    .nav-item:hover, .nav-item.active {
      color: #00f0ff;
      text-shadow: 0 0 10px rgba(0, 240, 255, 0.5);
    }

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

    .btn-glow {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 600;
      color: #ffffff;
      background: linear-gradient(135deg, var(--primary-pink), var(--primary-purple));
      border: 1px solid rgba(255, 255, 255, 0.2);
      border-radius: 6px;
      box-shadow: var(--glow-pink);
      cursor: pointer;
      transition: all 0.3s ease;
    }

    .btn-glow:hover {
      transform: translateY(-2px);
      box-shadow: 0 0 30px rgba(255, 45, 135, 0.7);
      color: #ffffff;
    }

    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 20px;
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--neon-cyan);
      background: transparent;
      border: 1px solid var(--neon-cyan);
      border-radius: 6px;
      transition: all 0.3s ease;
    }

    .btn-outline:hover {
      background: rgba(0, 240, 255, 0.12);
      box-shadow: 0 0 15px rgba(0, 240, 255, 0.4);
    }

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

    /* 首屏 Hero */
    .hero-section {
      padding: 90px 0 60px;
      text-align: center;
      position: relative;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: rgba(255, 45, 135, 0.15);
      border: 1px solid var(--primary-pink);
      border-radius: 30px;
      font-size: 0.85rem;
      color: #ff94c8;
      margin-bottom: 24px;
      box-shadow: 0 0 15px rgba(255, 45, 135, 0.2);
    }

    .hero-badge span {
      display: inline-block;
      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 20%, #ff83ba 60%, #00f0ff 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }

    .hero-cta-group {
      display: flex;
      justify-content: center;
      gap: 20px;
      margin-bottom: 50px;
      flex-wrap: wrap;
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 1000px;
      margin: 0 auto;
    }

    .stat-card {
      background: rgba(20, 13, 40, 0.7);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 22px 16px;
      text-align: center;
      backdrop-filter: blur(8px);
      transition: transform 0.3s ease, border-color 0.3s ease;
    }

    .stat-card:hover {
      transform: translateY(-4px);
      border-color: var(--neon-cyan);
      box-shadow: 0 0 20px rgba(0, 240, 255, 0.2);
    }

    .stat-num {
      font-size: 2rem;
      font-weight: 800;
      color: #ff2d87;
      margin-bottom: 4px;
      text-shadow: 0 0 10px rgba(255, 45, 135, 0.4);
    }

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

    /* 公用区块标题 */
    .section {
      padding: 75px 0;
      position: relative;
    }

    .section-header {
      text-align: center;
      max-width: 750px;
      margin: 0 auto 48px;
    }

    .section-tag {
      font-size: 0.85rem;
      text-transform: uppercase;
      letter-spacing: 1.5px;
      color: var(--neon-cyan);
      margin-bottom: 8px;
      display: block;
      font-weight: 600;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 12px;
    }

    .section-desc {
      font-size: 0.98rem;
      color: var(--text-muted);
    }

    /* 网格与卡片 */
    .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: 30px;
    }

    .cyber-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 28px 24px;
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
    }

    .cyber-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 3px;
      background: linear-gradient(90deg, var(--primary-pink), var(--primary-purple));
      opacity: 0;
      transition: opacity 0.3s ease;
    }

    .cyber-card:hover {
      background: var(--bg-card-hover);
      border-color: var(--primary-purple);
      transform: translateY(-5px);
      box-shadow: var(--glow-purple);
    }

    .cyber-card:hover::before {
      opacity: 1;
    }

    .card-icon {
      font-size: 2rem;
      margin-bottom: 16px;
      display: inline-block;
      color: var(--neon-cyan);
    }

    .card-title {
      font-size: 1.25rem;
      font-weight: 600;
      margin-bottom: 12px;
      color: #fff;
    }

    .card-text {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 标签云与模型阵列 */
    .model-tags-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }

    .model-tag {
      padding: 6px 14px;
      background: rgba(35, 18, 69, 0.7);
      border: 1px solid rgba(139, 45, 240, 0.3);
      border-radius: 20px;
      font-size: 0.85rem;
      color: #d8cceb;
      transition: all 0.2s ease;
    }

    .model-tag:hover {
      border-color: var(--neon-cyan);
      color: var(--neon-cyan);
      box-shadow: 0 0 10px rgba(0, 240, 255, 0.3);
    }

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

    .process-step {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 28px 20px;
      text-align: center;
      position: relative;
    }

    .step-badge {
      width: 44px;
      height: 44px;
      line-height: 44px;
      background: linear-gradient(135deg, var(--primary-pink), var(--primary-purple));
      border-radius: 50%;
      font-weight: 700;
      font-size: 1.1rem;
      color: #fff;
      margin: 0 auto 16px;
      box-shadow: 0 0 15px rgba(255, 45, 135, 0.5);
    }

    .step-title {
      font-size: 1.15rem;
      font-weight: 600;
      margin-bottom: 8px;
    }

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

    /* 图文案例与物料 */
    .media-card-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .media-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }

    .media-thumb-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #110920;
      overflow: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .media-thumb-wrap.square {
      aspect-ratio: 1 / 1;
    }

    .media-thumb-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

    .media-card:hover .media-thumb-wrap img {
      transform: scale(1.05);
    }

    .media-body {
      padding: 20px;
      flex: 1;
    }

    .media-title {
      font-size: 1.1rem;
      font-weight: 600;
      margin-bottom: 8px;
      color: #fff;
    }

    .media-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 对比评测表格 */
    .eval-score-box {
      background: linear-gradient(135deg, rgba(255, 45, 135, 0.15), rgba(139, 45, 240, 0.15));
      border: 1px solid var(--primary-pink);
      border-radius: 12px;
      padding: 30px;
      display: flex;
      align-items: center;
      justify-content: space-around;
      margin-bottom: 36px;
      flex-wrap: wrap;
      gap: 20px;
    }

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

    .score-big {
      font-size: 3rem;
      font-weight: 900;
      color: var(--neon-cyan);
      text-shadow: 0 0 15px rgba(0, 240, 255, 0.6);
      line-height: 1;
    }

    .stars-icon {
      color: #ffd700;
      font-size: 1.4rem;
      letter-spacing: 4px;
      margin-top: 6px;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      background: var(--bg-card);
    }

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

    .cyber-table th, .cyber-table td {
      padding: 16px 20px;
      border-bottom: 1px solid rgba(255, 45, 135, 0.15);
      font-size: 0.92rem;
    }

    .cyber-table th {
      background: rgba(35, 18, 69, 0.9);
      color: #ff94c8;
      font-weight: 600;
    }

    .cyber-table tr:last-child td {
      border-bottom: none;
    }

    .cyber-table tr:hover td {
      background: rgba(255, 45, 135, 0.05);
    }

    .highlight-col {
      color: var(--neon-cyan);
      font-weight: 600;
    }

    /* 表单区域 */
    .form-box {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 36px;
      box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    }

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

    .form-group label {
      display: block;
      font-size: 0.9rem;
      margin-bottom: 8px;
      color: #d8cceb;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      background: #0d081a;
      border: 1px solid rgba(139, 45, 240, 0.4);
      border-radius: 6px;
      color: #fff;
      font-size: 0.95rem;
      transition: border-color 0.3s;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--neon-cyan);
      box-shadow: 0 0 10px rgba(0, 240, 255, 0.3);
    }

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

    /* 用户评论 */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .review-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;
    }

    .review-text {
      font-size: 0.92rem;
      color: #d1c8e3;
      line-height: 1.6;
      margin-bottom: 18px;
      font-style: italic;
    }

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

    .reviewer-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary-pink), var(--primary-purple));
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: #fff;
    }

    .reviewer-name {
      font-size: 0.95rem;
      font-weight: 600;
      color: #fff;
    }

    .reviewer-role {
      font-size: 0.8rem;
      color: var(--neon-cyan);
    }

    /* FAQ 手风琴 */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 8px;
      overflow: hidden;
      transition: border-color 0.3s;
    }

    .faq-header {
      padding: 18px 24px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 1.05rem;
      font-weight: 600;
      color: #fff;
      user-select: none;
    }

    .faq-header:hover {
      color: var(--neon-cyan);
    }

    .faq-icon {
      font-size: 1.2rem;
      transition: transform 0.3s ease;
      color: var(--primary-pink);
    }

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

    .faq-body {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      padding: 0 24px;
      background: rgba(10, 6, 20, 0.5);
      color: var(--text-muted);
      font-size: 0.92rem;
      line-height: 1.6;
    }

    .faq-item.active .faq-body {
      padding: 14px 24px 20px;
      max-height: 240px;
    }

    /* 文章与资讯 */
    .article-links-box {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 28px;
      margin-top: 30px;
    }

    .article-list {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .article-item-link {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 8px 16px;
      background: rgba(35, 18, 69, 0.8);
      border: 1px solid rgba(255, 45, 135, 0.3);
      border-radius: 6px;
      font-size: 0.88rem;
      color: #e0d6f2;
    }

    .article-item-link:hover {
      background: var(--primary-purple);
      color: #fff;
      border-color: #fff;
    }

    /* 页脚 */
    .site-footer {
      background: #06040d;
      border-top: 1px solid rgba(255, 45, 135, 0.2);
      padding: 60px 0 30px;
      color: var(--text-muted);
      font-size: 0.9rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-title {
      font-size: 1.05rem;
      font-weight: 600;
      color: #fff;
      margin-bottom: 18px;
      position: relative;
      padding-bottom: 8px;
    }

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

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

    .footer-links a:hover {
      color: var(--neon-cyan);
      padding-left: 4px;
    }

    .friend-links-box {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 10px;
    }

    .friend-links-box a {
      color: #a99ec2;
      font-size: 0.85rem;
      padding: 4px 10px;
      background: rgba(255, 255, 255, 0.04);
      border-radius: 4px;
    }

    .friend-links-box a:hover {
      color: var(--neon-cyan);
      background: rgba(0, 240, 255, 0.1);
    }

    .footer-qrcode-wrap {
      text-align: center;
      display: inline-block;
    }

    .footer-qrcode-wrap img {
      width: 110px;
      height: 110px;
      border-radius: 8px;
      border: 1px solid var(--primary-pink);
      display: block;
      margin-bottom: 6px;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: #7b7391;
    }

    /* 浮动工具栏 */
    .float-toolbar {
      position: fixed;
      right: 20px;
      bottom: 40px;
      display: flex;
      flex-direction: column;
      gap: 12px;
      z-index: 999;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary-pink), var(--primary-purple));
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
      box-shadow: 0 0 15px rgba(255, 45, 135, 0.6);
      cursor: pointer;
      border: 1px solid rgba(255, 255, 255, 0.2);
      transition: transform 0.3s ease;
    }

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

    /* 响应式断点 */
    @media (max-width: 992px) {
      .grid-3, .grid-4, .hero-stats-grid, .media-card-grid, .review-grid, .process-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 2rem;
      }
      .grid-3, .grid-4, .grid-2, .hero-stats-grid, .media-card-grid, .review-grid, .process-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: #0a0614;
        flex-direction: column;
        border-bottom: 1px solid var(--border-color);
        padding: 16px 0;
      }
      .nav-links.show {
        display: flex;
      }
      .nav-item {
        width: 100%;
        text-align: center;
        padding: 10px 0;
      }
    }