:root {
      --bg-main: #f5f8fc;
      --bg-surface: #ffffff;
      --bg-surface-glass: rgba(255, 255, 255, 0.88);
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --primary: #00d287;
      --primary-dark: #059669;
      --secondary: #6366f1;
      --accent: #06b6d4;
      --neon-glow: 0 0 16px rgba(0, 210, 135, 0.4), 0 0 32px rgba(99, 102, 241, 0.2);
      --border-color: #e2e8f0;
      --border-neon: rgba(0, 210, 135, 0.4);
      --card-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.05), 0 8px 10px -6px rgba(15, 23, 42, 0.03);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --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);
    }

    body {
      background: radial-gradient(circle at 10% 0%, rgba(99, 102, 241, 0.08) 0%, transparent 40%),
                  radial-gradient(circle at 90% 20%, rgba(0, 210, 135, 0.08) 0%, transparent 40%),
                  linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }

    .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: var(--bg-surface-glass);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
      transition: all 0.3s ease;
    }

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

    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }

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

    .brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .brand-badge {
      font-size: 0.75rem;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      color: #000;
      font-weight: 700;
      padding: 2px 6px;
      border-radius: 4px;
    }

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

    .nav-links a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.92rem;
      font-weight: 600;
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      transition: all 0.2s ease;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-dark);
      background: rgba(0, 210, 135, 0.1);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      border-radius: var(--radius-md);
      font-size: 0.95rem;
      font-weight: 600;
      text-decoration: none;
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
      cursor: pointer;
      border: 1px solid transparent;
      white-space: nowrap;
    }

    .btn-neon {
      background: linear-gradient(135deg, #00d287 0%, #06b6d4 100%);
      color: #052e16;
      box-shadow: 0 4px 14px rgba(0, 210, 135, 0.35);
    }

    .btn-neon:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(0, 210, 135, 0.5);
    }

    .btn-outline {
      background: #ffffff;
      color: var(--text-main);
      border-color: var(--border-color);
    }

    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary-dark);
      background: rgba(0, 210, 135, 0.05);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
    }

    /* 区域通用样式 */
    .section-block {
      padding: 80px 0;
      position: relative;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px auto;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.82rem;
      font-weight: 700;
      color: var(--primary-dark);
      background: rgba(0, 210, 135, 0.12);
      border: 1px solid rgba(0, 210, 135, 0.3);
      padding: 4px 14px;
      border-radius: 999px;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 16px;
    }

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

    /* 首屏 Hero 区域（严禁出现图片） */
    .hero-section {
      padding: 90px 0 70px 0;
      text-align: center;
      position: relative;
      background: radial-gradient(circle at 50% 10%, rgba(0, 210, 135, 0.15) 0%, rgba(99, 102, 241, 0.08) 50%, transparent 80%);
    }

    .hero-badge-pill {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      padding: 6px 18px;
      border-radius: 999px;
      border: 1px solid var(--border-neon);
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: 0 4px 15px rgba(0, 210, 135, 0.15);
      margin-bottom: 24px;
    }

    .hero-badge-pill .pulse-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--primary);
      box-shadow: 0 0 8px var(--primary);
      animation: pulseAnim 1.8s infinite;
    }

    @keyframes pulseAnim {
      0%, 100% { transform: scale(1); opacity: 1; }
      50% { transform: scale(1.4); opacity: 0.6; }
    }

    .hero-title {
      font-size: 3rem;
      font-weight: 900;
      line-height: 1.25;
      letter-spacing: -1px;
      color: var(--text-main);
      margin-bottom: 24px;
    }

    .hero-title .glow-highlight {
      background: linear-gradient(135deg, #059669 0%, #0284c7 50%, #4f46e5 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

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

    .hero-actions {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }

    .hero-actions .btn-official {
      padding: 14px 36px;
      font-size: 1.1rem;
      font-weight: 700;
      border-radius: var(--radius-md);
      background: linear-gradient(135deg, #00d287 0%, #06b6d4 100%);
      color: #022c16;
      box-shadow: 0 8px 25px rgba(0, 210, 135, 0.4);
      text-decoration: none;
      transition: all 0.3s;
    }

    .hero-actions .btn-official:hover {
      transform: translateY(-3px) scale(1.02);
      box-shadow: 0 12px 30px rgba(0, 210, 135, 0.6);
    }

    /* 首屏数据指标卡 */
    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 20px;
    }

    .stat-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 16px;
      box-shadow: var(--card-shadow);
      text-align: center;
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
    }

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

    .stat-card:hover {
      transform: translateY(-4px);
      border-color: var(--primary);
    }

    .stat-card:hover::after {
      opacity: 1;
    }

    .stat-num {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .stat-num span {
      color: var(--primary-dark);
      font-size: 1.4rem;
    }

    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 多模型聚合矩阵卡 */
    .model-tags-container {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--card-shadow);
      margin-bottom: 40px;
    }

    .model-tag-list {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
    }

    .model-chip {
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      padding: 6px 14px;
      border-radius: 30px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-muted);
      transition: all 0.2s;
    }

    .model-chip:hover {
      background: #00d287;
      color: #042f1a;
      border-color: #00d287;
      box-shadow: 0 4px 12px rgba(0, 210, 135, 0.3);
      transform: translateY(-1px);
    }

    /* 服务与场景卡片网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--card-shadow);
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .feature-card:hover {
      transform: translateY(-6px);
      border-color: var(--border-neon);
      box-shadow: 0 16px 30px rgba(0, 210, 135, 0.12);
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-md);
      background: linear-gradient(135deg, rgba(0, 210, 135, 0.15), rgba(99, 102, 241, 0.15));
      color: var(--primary-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      font-weight: 700;
      margin-bottom: 20px;
    }

    .feature-card h3 {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .feature-card p {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .feature-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      margin-top: auto;
    }

    .feature-tag-item {
      font-size: 0.75rem;
      background: #f1f5f9;
      color: #475569;
      padding: 3px 8px;
      border-radius: 4px;
    }

    /* 案例展示与图文组合 */
    .media-card-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
      align-items: center;
      margin-bottom: 40px;
    }

    .media-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--card-shadow);
    }

    .media-img-wrap {
      width: 100%;
      aspect-ratio: 16/9;
      background: #e2e8f0;
      overflow: hidden;
    }

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

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

    .media-card:hover .media-img-wrap img {
      transform: scale(1.04);
    }

    .media-info {
      padding: 24px;
    }

    .media-info h3 {
      font-size: 1.2rem;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .media-info p {
      font-size: 0.92rem;
      color: var(--text-muted);
    }

    /* 宣传图展示条 */
    .banner-strip {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 30px;
    }

    .banner-item {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      background: #fff;
    }

    .banner-item img {
      width: 100%;
      height: auto;
      display: block;
    }

    /* 对比评测板块 */
    .review-summary-card {
      background: linear-gradient(135deg, #ffffff 0%, #f0fdf4 100%);
      border: 2px solid var(--primary);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: 0 12px 30px rgba(0, 210, 135, 0.15);
      margin-bottom: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
    }

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

    .score-circle {
      width: 90px;
      height: 90px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      color: #042f1a;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      font-size: 2rem;
      font-weight: 900;
      box-shadow: var(--neon-glow);
    }

    .score-circle span {
      font-size: 0.75rem;
      font-weight: 700;
    }

    .score-text h3 {
      font-size: 1.4rem;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .score-stars {
      color: #eab308;
      font-size: 1.2rem;
      letter-spacing: 2px;
    }

    .compare-table-wrapper {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow-x: auto;
      box-shadow: var(--card-shadow);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }

    .compare-table th,
    .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }

    .compare-table th {
      background: #f8fafc;
      color: var(--text-main);
      font-weight: 700;
    }

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

    .compare-table .highlight-col {
      background: rgba(0, 210, 135, 0.05);
      font-weight: 700;
      color: var(--primary-dark);
    }

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

    .step-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 28px 20px;
      box-shadow: var(--card-shadow);
      position: relative;
    }

    .step-num {
      font-size: 1.8rem;
      font-weight: 900;
      color: var(--primary);
      margin-bottom: 12px;
    }

    .step-card h3 {
      font-size: 1.15rem;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .step-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

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

    .faq-item {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: all 0.2s;
    }

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

    .faq-question {
      padding: 18px 24px;
      width: 100%;
      text-align: left;
      background: none;
      border: none;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

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

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background: #f8fafc;
    }

    .faq-answer-inner {
      padding: 18px 24px;
      font-size: 0.95rem;
      color: var(--text-muted);
      border-top: 1px solid var(--border-color);
      line-height: 1.7;
    }

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

    .testimonial-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 28px;
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .user-info-box {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-top: 20px;
    }

    .user-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--secondary), var(--primary));
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }

    .user-meta h4 {
      font-size: 0.95rem;
      color: var(--text-main);
    }

    .user-meta p {
      font-size: 0.82rem;
      color: var(--text-light);
    }

    /* 需求表单与联系 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 40px;
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--card-shadow);
    }

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

    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      background: #f8fafc;
      color: var(--text-main);
      transition: border-color 0.2s;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      background: #fff;
    }

    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    .contact-info-panel {
      background: #f8fafc;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px;
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .contact-item {
      display: flex;
      flex-direction: column;
      gap: 4px;
    }

    .contact-item .label {
      font-size: 0.85rem;
      color: var(--text-light);
      font-weight: 600;
    }

    .contact-item .val {
      font-size: 1rem;
      color: var(--text-main);
      font-weight: 700;
    }

    .qr-container {
      margin-top: 10px;
      text-align: center;
      background: #fff;
      padding: 16px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
    }

    .qr-container img {
      width: 130px;
      height: 130px;
      object-fit: contain;
      display: block;
      margin: 0 auto 8px auto;
    }

    /* 行业资讯与文章链接区 */
    .article-links-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 12px;
      margin-top: 20px;
    }

    .article-link-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      padding: 14px 18px;
      border-radius: var(--radius-sm);
      text-decoration: none;
      color: var(--text-muted);
      font-size: 0.9rem;
      font-weight: 600;
      transition: all 0.2s;
      display: block;
    }

    .article-link-card:hover {
      color: var(--primary-dark);
      border-color: var(--primary);
      background: rgba(0, 210, 135, 0.05);
    }

    /* 友情链接 */
    .friend-links-box {
      margin-top: 50px;
      padding-top: 30px;
      border-top: 1px solid var(--border-color);
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 14px;
    }

    .friend-links-box span {
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .friend-links-box a {
      font-size: 0.88rem;
      color: var(--text-light);
      text-decoration: none;
      transition: color 0.2s;
    }

    .friend-links-box a:hover {
      color: var(--primary-dark);
    }

    /* 页脚 */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 50px 0 30px 0;
      font-size: 0.9rem;
    }

    .footer-top {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
      padding-bottom: 30px;
      border-bottom: 1px solid #1e293b;
    }

    .footer-brand h4 {
      color: #ffffff;
      font-size: 1.2rem;
      margin-bottom: 6px;
    }

    .footer-bottom {
      padding-top: 24px;
      text-align: center;
      color: #64748b;
      font-size: 0.85rem;
    }

    .footer-bottom a {
      color: #94a3b8;
      text-decoration: none;
    }

    /* 悬浮客服面板 */
    .floating-service {
      position: fixed;
      right: 24px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #00d287;
      color: #042f1a;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
      box-shadow: 0 4px 15px rgba(0, 210, 135, 0.4);
      cursor: pointer;
      border: none;
      transition: all 0.3s;
      text-decoration: none;
    }

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

    /* 响应式 */
    @media (max-width: 992px) {
      .hero-title { font-size: 2.3rem; }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .hero-stats-grid { grid-template-columns: repeat(2, 1fr); }
      .steps-grid { grid-template-columns: repeat(2, 1fr); }
      .banner-strip { grid-template-columns: repeat(2, 1fr); }
      .testimonial-grid { grid-template-columns: repeat(2, 1fr); }
      .contact-wrapper { grid-template-columns: 1fr; }
      .media-card-grid { grid-template-columns: 1fr; }
    }

    @media (max-width: 768px) {
      .menu-toggle { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      }
      .nav-links.show { display: flex; }
      .nav-actions { display: none; }
      .hero-title { font-size: 1.85rem; }
      .grid-3, .grid-2, .hero-stats-grid, .steps-grid, .testimonial-grid, .banner-strip {
        grid-template-columns: 1fr;
      }
      .section-block { padding: 50px 0; }
    }