:root {
      --primary: #4f46e5;
      --primary-light: #6366f1;
      --secondary: #06b6d4;
      --accent: #f43f5e;
      --accent-gradient: linear-gradient(135deg, #4f46e5 0%, #06b6d4 50%, #f43f5e 100%);
      --soft-bg: #f8fafc;
      --card-bg: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
      --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.05);
      --shadow-md: 0 10px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
      --shadow-lg: 0 20px 30px -10px rgba(79, 70, 229, 0.15);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--soft-bg);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
    }

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

    .main-container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

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

    .brand-box .ai-page-logo {
      height: 40px;
      width: auto;
      display: block;
    }

    .brand-name {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }

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

    .nav-links li a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-muted);
      padding: 8px 14px;
      border-radius: var(--radius-sm);
      display: inline-block;
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary);
      background: rgba(79, 70, 229, 0.08);
    }

    .nav-action {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .btn-portal {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 18px;
      font-size: 0.9rem;
      font-weight: 600;
      border-radius: 999px;
      color: #fff;
      background: var(--accent-gradient);
      box-shadow: 0 4px 14px rgba(79, 70, 229, 0.3);
      transition: var(--transition);
      border: none;
      cursor: pointer;
    }

    .btn-portal:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(79, 70, 229, 0.45);
      color: #fff;
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 4px;
    }

    /* 首屏 Hero 无图片区 - 活力渐变风 */
    .hero-section {
      position: relative;
      padding: 80px 0 60px;
      background: radial-gradient(1000px circle at 50% 10%, rgba(99, 102, 241, 0.12), rgba(6, 182, 212, 0.05), transparent 70%);
      border-bottom: 1px solid var(--border-color);
      text-align: center;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #ffffff;
      border: 1px solid #e0e7ff;
      border-radius: 999px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--primary);
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
    }

    .hero-badge .pulse-dot {
      width: 8px;
      height: 8px;
      background-color: var(--accent);
      border-radius: 50%;
      animation: pulse 1.8s infinite;
    }

    @keyframes pulse {
      0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(244, 63, 94, 0.7); }
      70% { transform: scale(1.1); box-shadow: 0 0 0 8px rgba(244, 63, 94, 0); }
      100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(244, 63, 94, 0); }
    }

    .hero-title {
      font-size: clamp(2rem, 4vw, 3.2rem);
      font-weight: 900;
      line-height: 1.25;
      color: #0f172a;
      max-width: 900px;
      margin: 0 auto 20px;
      letter-spacing: -1px;
    }

    .hero-title .gradient-text {
      background: linear-gradient(120deg, #4f46e5, #0284c7, #e11d48);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 780px;
      margin: 0 auto 36px;
      font-weight: 400;
      line-height: 1.7;
    }

    .hero-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }

    .hero-btn-primary {
      padding: 14px 34px;
      font-size: 1.05rem;
      font-weight: 700;
      border-radius: 12px;
      color: #ffffff;
      background: var(--accent-gradient);
      box-shadow: 0 10px 25px -3px rgba(79, 70, 229, 0.4);
      transition: var(--transition);
      border: 1px solid rgba(255, 255, 255, 0.2);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }

    .hero-btn-primary:hover {
      transform: translateY(-3px) scale(1.02);
      box-shadow: 0 14px 30px -4px rgba(79, 70, 229, 0.55);
      color: #ffffff;
    }

    .hero-btn-secondary {
      padding: 14px 28px;
      font-size: 1.05rem;
      font-weight: 600;
      border-radius: 12px;
      color: var(--text-main);
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .hero-btn-secondary:hover {
      background: #f1f5f9;
      transform: translateY(-2px);
      border-color: #cbd5e1;
    }

    /* 首屏数据亮点矩阵 (无图片) */
    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      max-width: 1040px;
      margin: 0 auto;
    }

    .metric-item {
      background: #ffffff;
      padding: 20px 16px;
      border-radius: var(--radius-md);
      border: 1px solid #eef2f6;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .metric-item:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #c7d2fe;
    }

    .metric-num {
      font-size: 1.85rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .metric-label {
      font-size: 0.85rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 通用区块排版 */
    .section-block {
      padding: 72px 0;
      border-bottom: 1px solid #edf2f7;
    }

    .section-header {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 48px;
    }

    .section-tag {
      display: inline-block;
      padding: 4px 12px;
      background: rgba(79, 70, 229, 0.08);
      color: var(--primary);
      border-radius: 999px;
      font-size: 0.8rem;
      font-weight: 700;
      margin-bottom: 12px;
      text-transform: uppercase;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }

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

    /* 平台支持模型标签流 */
    .models-marquee-wrapper {
      background: #ffffff;
      padding: 30px 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      margin-bottom: 30px;
    }

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

    .model-tag {
      background: #f1f5f9;
      color: #1e293b;
      font-size: 0.85rem;
      font-weight: 600;
      padding: 8px 16px;
      border-radius: 8px;
      border: 1px solid #e2e8f0;
      transition: var(--transition);
    }

    .model-tag:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
      transform: translateY(-2px);
    }

    /* 场景卡片网格 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 20px;
    }

    .service-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
      border-color: #a5b4fc;
    }

    .card-icon-badge {
      width: 44px;
      height: 44px;
      border-radius: 10px;
      background: linear-gradient(135deg, rgba(79, 70, 229, 0.1), rgba(6, 182, 212, 0.15));
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      color: var(--primary);
      margin-bottom: 16px;
    }

    .service-card h3 {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .service-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 图文案例展示 */
    .media-showcase-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
      align-items: stretch;
    }

    .showcase-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .showcase-card:hover {
      box-shadow: var(--shadow-lg);
      transform: translateY(-5px);
    }

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

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

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

    .showcase-content {
      padding: 20px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }

    .showcase-title {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .showcase-text {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.55;
    }

    /* 评测与对比模块 */
    .evaluation-board {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      padding: 36px;
      box-shadow: var(--shadow-md);
      margin-bottom: 32px;
    }

    .rating-banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
      padding-bottom: 24px;
      margin-bottom: 28px;
      border-bottom: 1px solid #f1f5f9;
    }

    .rating-score-box {
      display: flex;
      align-items: baseline;
      gap: 12px;
    }

    .score-big {
      font-size: 3.5rem;
      font-weight: 900;
      color: var(--primary);
      line-height: 1;
    }

    .score-max {
      font-size: 1.25rem;
      color: var(--text-muted);
      font-weight: 600;
    }

    .rating-meta h4 {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 4px;
    }

    .rating-stars {
      color: #f59e0b;
      font-size: 1.2rem;
      letter-spacing: 2px;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.92rem;
    }

    .compare-table th,
    .compare-table td {
      padding: 16px 14px;
      border-bottom: 1px solid #f1f5f9;
    }

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

    .compare-table tr:hover td {
      background: #f8fafc;
    }

    .highlight-cell {
      color: var(--primary);
      font-weight: 700;
      background: rgba(79, 70, 229, 0.03);
    }

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

    .step-card {
      background: #ffffff;
      padding: 24px 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      position: relative;
    }

    .step-badge {
      font-size: 0.8rem;
      font-weight: 800;
      color: var(--primary);
      background: #eef2ff;
      padding: 4px 10px;
      border-radius: 6px;
      display: inline-block;
      margin-bottom: 12px;
    }

    .step-title {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

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

    /* 用户评论 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 20px;
    }

    .testimonial-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .testimonial-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
    }

    .testimonial-text {
      font-size: 0.92rem;
      color: #334155;
      line-height: 1.65;
      margin-bottom: 16px;
      font-style: normal;
    }

    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px dashed #e2e8f0;
      padding-top: 14px;
    }

    .user-avatar-circle {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--accent-gradient);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.95rem;
    }

    .user-info-name {
      font-weight: 700;
      font-size: 0.95rem;
      color: var(--text-main);
    }

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

    /* FAQ 手风琴 */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-item.active {
      border-color: var(--primary);
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 18px 22px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 700;
      font-size: 1rem;
      color: var(--text-main);
      user-select: none;
    }

    .faq-toggle-icon {
      font-size: 1.25rem;
      color: var(--primary);
      transition: transform 0.28s ease;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #f8fafc;
      color: var(--text-muted);
      font-size: 0.92rem;
      line-height: 1.65;
      padding: 0 22px;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px 22px 20px;
      border-top: 1px solid #f1f5f9;
    }

    /* 需求表单与联系 */
    .contact-form-layout {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 36px;
      background: #ffffff;
      padding: 40px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }

    .contact-info-panel h3 {
      font-size: 1.5rem;
      font-weight: 800;
      margin-bottom: 16px;
    }

    .contact-info-panel p {
      font-size: 0.95rem;
      color: var(--text-muted);
      margin-bottom: 24px;
    }

    .contact-meta-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .contact-meta-item {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      font-size: 0.95rem;
    }

    .meta-icon-tag {
      padding: 4px 8px;
      background: #eef2ff;
      color: var(--primary);
      border-radius: 6px;
      font-size: 0.8rem;
      font-weight: 700;
    }

    .qr-container {
      margin-top: 24px;
      display: flex;
      align-items: center;
      gap: 16px;
      background: #f8fafc;
      padding: 16px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
    }

    .qr-container img {
      width: 88px;
      height: 88px;
      object-fit: cover;
      border-radius: 6px;
      border: 1px solid #e2e8f0;
    }

    .form-box {
      display: flex;
      flex-direction: column;
      gap: 18px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .form-group label {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
    }

    .form-control {
      padding: 12px 14px;
      border-radius: var(--radius-sm);
      border: 1px solid #cbd5e1;
      font-size: 0.95rem;
      transition: var(--transition);
      background: #fff;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
    }

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

    .submit-btn {
      padding: 14px 28px;
      background: var(--accent-gradient);
      color: #ffffff;
      border: none;
      border-radius: var(--radius-sm);
      font-size: 1rem;
      font-weight: 700;
      cursor: pointer;
      box-shadow: 0 4px 14px rgba(79, 70, 229, 0.3);
      transition: var(--transition);
    }

    .submit-btn:hover {
      box-shadow: 0 6px 20px rgba(79, 70, 229, 0.45);
      transform: translateY(-2px);
    }

    /* 资讯与外链板块 */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 16px;
    }

    .article-item-card {
      background: #ffffff;
      padding: 18px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      transition: var(--transition);
    }

    .article-item-card:hover {
      border-color: var(--primary);
      transform: translateY(-2px);
    }

    .article-item-card a {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
      display: block;
      margin-bottom: 6px;
    }

    .article-item-card a:hover {
      color: var(--primary);
    }

    .article-date {
      font-size: 0.8rem;
      color: #94a3b8;
    }

    /* 友情链接与页脚 */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 48px 0 30px;
    }

    .footer-links-box {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      align-items: center;
      margin-bottom: 24px;
      padding-bottom: 20px;
      border-bottom: 1px solid #f1f5f9;
    }

    .footer-links-label {
      font-size: 0.88rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .footer-links-box a {
      font-size: 0.85rem;
      color: var(--text-muted);
      background: #f8fafc;
      padding: 4px 10px;
      border-radius: 6px;
      border: 1px solid #edf2f7;
    }

    .footer-links-box a:hover {
      color: var(--primary);
      border-color: #cbd5e1;
    }

    .footer-bottom {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 14px;
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* 悬浮客服挂件 */
    .floating-support {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: #ffffff;
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      border: 1px solid #e2e8f0;
      cursor: pointer;
      transition: var(--transition);
      font-size: 1.1rem;
    }

    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: scale(1.08);
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-metrics {
        grid-template-columns: repeat(2, 1fr);
      }
      .flow-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-form-layout {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 16px 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }

      .nav-links.show {
        display: flex;
      }

      .mobile-menu-btn {
        display: block;
      }

      .hero-title {
        font-size: 1.85rem;
      }

      .hero-metrics {
        grid-template-columns: 1fr;
      }

      .flow-steps {
        grid-template-columns: 1fr;
      }
    }