:root {
      --bg-main: #0a0714;
      --bg-card: #130f24;
      --bg-card-hover: #1c1536;
      --bg-glass: rgba(24, 18, 48, 0.7);
      --accent-pink: #ff2a85;
      --accent-purple: #9d4edd;
      --accent-cyan: #00f0ff;
      --text-main: #ffffff;
      --text-muted: #b3aed0;
      --text-dim: #7a7499;
      --border-color: rgba(255, 42, 133, 0.2);
      --border-glow: rgba(157, 78, 221, 0.4);
      --glow-pink: 0 0 25px rgba(255, 42, 133, 0.35);
      --glow-cyan: 0 0 25px rgba(0, 240, 255, 0.35);
      --max-width: 1240px;
      --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-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% 20%, rgba(157, 78, 221, 0.15) 0%, transparent 40%),
        radial-gradient(circle at 85% 60%, rgba(255, 42, 133, 0.12) 0%, transparent 45%),
        radial-gradient(circle at 50% 90%, rgba(0, 240, 255, 0.08) 0%, transparent 50%);
      background-attachment: fixed;
    }

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

    img {
      display: block;
      max-width: 100%;
      height: auto;
    }

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(10, 7, 20, 0.85);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--border-color);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

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

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

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

    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }

    .nav-links li a {
      display: block;
      padding: 10px 14px;
      font-size: 0.92rem;
      color: var(--text-muted);
      font-weight: 500;
      position: relative;
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      color: #fff;
      text-shadow: 0 0 10px var(--accent-pink);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      border-radius: 8px;
      font-size: 0.95rem;
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
      border: 1px solid transparent;
      text-align: center;
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--accent-pink), var(--accent-purple));
      color: #fff;
      box-shadow: 0 4px 18px rgba(255, 42, 133, 0.4);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 24px rgba(255, 42, 133, 0.65);
    }

    .btn-outline {
      border-color: var(--accent-pink);
      color: #fff;
      background: rgba(255, 42, 133, 0.08);
    }

    .btn-outline:hover {
      background: rgba(255, 42, 133, 0.2);
      border-color: var(--accent-pink);
      box-shadow: var(--glow-pink);
    }

    .btn-cyan {
      background: linear-gradient(135deg, #00f0ff, #0077ff);
      color: #050510;
      font-weight: 700;
      box-shadow: var(--glow-cyan);
    }

    .btn-cyan:hover {
      transform: translateY(-2px);
      box-shadow: 0 0 30px rgba(0, 240, 255, 0.7);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      color: #fff;
      font-size: 1.5rem;
      cursor: pointer;
      padding: 6px;
    }

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

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: rgba(255, 42, 133, 0.12);
      border: 1px solid var(--accent-pink);
      border-radius: 30px;
      color: var(--accent-pink);
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 24px;
      box-shadow: var(--glow-pink);
    }

    .hero-badge span {
      display: inline-block;
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--accent-pink);
      box-shadow: 0 0 8px var(--accent-pink);
      animation: pulse 1.8s infinite;
    }

    @keyframes pulse {
      0%, 100% { opacity: 1; transform: scale(1); }
      50% { opacity: 0.4; transform: scale(0.8); }
    }

    .hero-title {
      font-size: clamp(2rem, 4.5vw, 3.4rem);
      line-height: 1.25;
      font-weight: 800;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title .highlight {
      background: linear-gradient(135deg, #ff2a85 0%, #d946ef 50%, #00f0ff 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

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

    .hero-cta-group {
      display: flex;
      justify-content: center;
      align-items: center;
      flex-wrap: wrap;
      gap: 18px;
      margin-bottom: 50px;
    }

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

    .stat-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 24px 16px;
      text-align: center;
      transition: var(--transition);
      position: relative;
      overflow: hidden;
    }

    .stat-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 2px;
      background: linear-gradient(90deg, transparent, var(--accent-pink), transparent);
    }

    .stat-card:hover {
      transform: translateY(-4px);
      border-color: var(--accent-pink);
      box-shadow: var(--glow-pink);
    }

    .stat-number {
      font-size: 2.2rem;
      font-weight: 800;
      color: #fff;
      font-family: monospace, sans-serif;
      margin-bottom: 4px;
      background: linear-gradient(180deg, #fff, var(--accent-cyan));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* 通用分块与标题 */
    .section-padding {
      padding: 80px 0;
      position: relative;
    }

    .section-header {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 50px;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.85rem;
      text-transform: uppercase;
      letter-spacing: 2px;
      color: var(--accent-pink);
      font-weight: 700;
      margin-bottom: 10px;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 800;
      margin-bottom: 16px;
      color: #fff;
    }

    .section-subtitle {
      font-size: 1.05rem;
      color: var(--text-muted);
    }

    /* 卡片式通用栅格 */
    .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: 30px;
    }

    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 14px;
      padding: 30px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      height: 100%;
    }

    .feature-card:hover {
      border-color: var(--accent-purple);
      background: var(--bg-card-hover);
      transform: translateY(-5px);
      box-shadow: 0 10px 30px rgba(157, 78, 221, 0.25);
    }

    .feature-icon-box {
      width: 52px;
      height: 52px;
      border-radius: 10px;
      background: rgba(255, 42, 133, 0.12);
      border: 1px solid var(--accent-pink);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.5rem;
      margin-bottom: 20px;
      color: var(--accent-pink);
    }

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

    .feature-desc {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.65;
      flex-grow: 1;
    }

    /* 标签云 (模型支持) */
    .models-cloud {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 12px;
      margin-top: 30px;
    }

    .model-chip {
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(255, 255, 255, 0.1);
      padding: 8px 18px;
      border-radius: 20px;
      font-size: 0.9rem;
      font-weight: 500;
      color: #e2dff0;
      transition: var(--transition);
    }

    .model-chip:hover {
      border-color: var(--accent-cyan);
      color: var(--accent-cyan);
      box-shadow: 0 0 12px rgba(0, 240, 255, 0.3);
      transform: scale(1.05);
    }

    /* 对比评测模块 */
    .eval-container {
      background: linear-gradient(180deg, rgba(28, 21, 54, 0.8), rgba(19, 15, 36, 0.95));
      border: 1px solid var(--accent-pink);
      border-radius: 16px;
      padding: 40px;
      box-shadow: var(--glow-pink);
    }

    .eval-top-bar {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
      padding-bottom: 25px;
      border-bottom: 1px solid var(--border-color);
      margin-bottom: 30px;
    }

    .eval-score-badge {
      display: flex;
      align-items: baseline;
      gap: 10px;
    }

    .eval-score-num {
      font-size: 3.5rem;
      font-weight: 900;
      color: var(--accent-pink);
      line-height: 1;
      text-shadow: 0 0 20px rgba(255, 42, 133, 0.6);
    }

    .eval-score-stars {
      color: #ffd700;
      font-size: 1.3rem;
      letter-spacing: 2px;
    }

    .eval-table-wrapper {
      overflow-x: auto;
    }

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

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

    .eval-table th {
      color: var(--text-muted);
      font-weight: 600;
      font-size: 0.95rem;
      background: rgba(0, 0, 0, 0.2);
    }

    .eval-table td {
      font-size: 0.95rem;
    }

    .eval-table .highlight-col {
      color: var(--accent-pink);
      font-weight: 600;
      background: rgba(255, 42, 133, 0.06);
    }

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

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

    .flow-step-item:hover {
      border-color: var(--accent-pink);
      transform: translateY(-4px);
    }

    .step-num {
      display: inline-block;
      font-size: 1.5rem;
      font-weight: 800;
      color: var(--accent-pink);
      margin-bottom: 10px;
      font-family: monospace;
    }

    /* 案例展示 */
    .media-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 14px;
      overflow: hidden;
      transition: var(--transition);
    }

    .media-card:hover {
      border-color: var(--accent-cyan);
      box-shadow: 0 8px 25px rgba(0, 240, 255, 0.2);
    }

    .media-img-wrapper {
      width: 100%;
      overflow: hidden;
      background: #000;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .media-card img {
      width: 100%;
      height: 220px;
      object-fit: cover;
      transition: transform 0.5s ease;
    }

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

    .media-content {
      padding: 20px;
    }

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

    .review-text {
      font-size: 0.95rem;
      color: #dedaf0;
      margin-bottom: 20px;
      line-height: 1.6;
    }

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

    .author-avatar-text {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--accent-pink), var(--accent-purple));
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: #fff;
    }

    .author-info h4 {
      font-size: 0.95rem;
      color: #fff;
    }

    .author-info p {
      font-size: 0.82rem;
      color: var(--text-dim);
    }

    /* 表单与需求匹配 */
    .form-container {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 16px;
      padding: 40px;
      max-width: 800px;
      margin: 0 auto;
      box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
    }

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

    .form-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }

    .form-label {
      display: block;
      font-size: 0.9rem;
      color: var(--text-muted);
      margin-bottom: 8px;
      font-weight: 500;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      background: rgba(10, 7, 20, 0.8);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: 8px;
      color: #fff;
      font-size: 0.95rem;
      transition: var(--transition);
    }

    .form-control:focus {
      outline: none;
      border-color: var(--accent-pink);
      box-shadow: 0 0 12px rgba(255, 42, 133, 0.3);
    }

    /* 折叠面板 FAQ */
    .faq-wrapper {
      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: 10px;
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      color: #fff;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: rgba(255, 255, 255, 0.02);
    }

    .faq-question:hover {
      color: var(--accent-pink);
    }

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

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      padding: 0 24px;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 16px 24px 22px;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
    }

    /* 行业资讯 & 动态 */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .article-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 10px;
      padding: 20px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .article-title {
      font-size: 1rem;
      font-weight: 600;
      color: #fff;
      margin-bottom: 12px;
      line-height: 1.5;
    }

    .article-link {
      color: var(--accent-cyan);
      font-size: 0.88rem;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      margin-top: 10px;
    }

    /* 联系与客服 */
    .contact-card-grid {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 30px;
    }

    .contact-info-panel {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 14px;
      padding: 30px;
    }

    .contact-meta-item {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 20px;
    }

    .contact-meta-icon {
      width: 44px;
      height: 44px;
      background: rgba(255, 42, 133, 0.1);
      border: 1px solid var(--accent-pink);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--accent-pink);
      font-size: 1.2rem;
    }

    .qr-container {
      display: flex;
      flex-direction: column;
      align-items: center;
      background: rgba(0, 0, 0, 0.3);
      padding: 20px;
      border-radius: 10px;
      margin-top: 20px;
      border: 1px dashed var(--border-color);
    }

    .qr-container img {
      width: 140px;
      height: 140px;
      border-radius: 8px;
      margin-bottom: 10px;
    }

    /* 页脚 */
    .site-footer {
      background: #06040d;
      border-top: 1px solid var(--border-color);
      padding: 60px 0 30px;
      font-size: 0.92rem;
      color: var(--text-dim);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 30px;
      margin-bottom: 40px;
    }

    .footer-brand p {
      margin-top: 15px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    .footer-col h4 {
      color: #fff;
      font-size: 1.05rem;
      margin-bottom: 18px;
      font-weight: 600;
    }

    .footer-links-list {
      list-style: none;
    }

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

    .footer-links-list a {
      color: var(--text-muted);
    }

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

    .friend-links-box {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 24px;
      margin-bottom: 24px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 15px;
    }

    .friend-links-box a {
      color: var(--text-muted);
      font-size: 0.88rem;
    }

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

    .footer-bottom {
      text-align: center;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      padding-top: 20px;
      font-size: 0.85rem;
    }

    /* 浮动工具 */
    .floating-tools {
      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(--bg-card);
      border: 1px solid var(--accent-pink);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.5);
      transition: var(--transition);
    }

    .float-btn:hover {
      background: var(--accent-pink);
      transform: scale(1.1);
      box-shadow: var(--glow-pink);
    }

    /* 响应式媒体查询 */
    @media (max-width: 992px) {
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .articles-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-4, .flow-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .contact-card-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-links {
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--bg-main);
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        display: none;
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links li a {
        padding: 12px;
        width: 100%;
      }
      .grid-3, .grid-4, .grid-2, .articles-grid, .flow-steps {
        grid-template-columns: 1fr;
      }
      .form-row {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .eval-top-bar {
        flex-direction: column;
        align-items: flex-start;
      }
    }