:root {
      --primary: #0062ff;
      --primary-hover: #004ecc;
      --accent: #00d2ff;
      --accent-warm: #ff5e3a;
      --bg-main: #f4f7fc;
      --bg-card: #ffffff;
      --bg-card-alt: #f0f5ff;
      --text-main: #141d2e;
      --text-muted: #5e6d82;
      --text-light: #8c9ba5;
      --border-color: #e2e8f4;
      --border-focus: #0062ff;
      --shadow-sm: 0 4px 14px rgba(0, 98, 255, 0.06);
      --shadow-md: 0 10px 30px rgba(0, 98, 255, 0.09);
      --shadow-lg: 0 18px 45px rgba(0, 98, 255, 0.12);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --container-max: 1200px;
      --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background: radial-gradient(circle at 10% 20%, #eef5ff 0%, #f7f9fd 50%, #f0f7ff 100%);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
      min-height: 100vh;
    }

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

    a:hover {
      color: var(--primary-hover);
    }

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

    .container {
      width: 100%;
      max-width: var(--container-max);
      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(255, 255, 255, 0.94);
      backdrop-filter: blur(14px);
      border-bottom: 1px solid rgba(226, 232, 244, 0.8);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    }

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

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

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

    .brand-text {
      font-size: 1.25rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      background: linear-gradient(135deg, #0051e0, #00b4db);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .nav-menu-wrapper {
      display: flex;
      align-items: center;
    }

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

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

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary);
      background-color: var(--bg-card-alt);
    }

    .nav-links .ai-page-home-link {
      font-weight: 700;
      color: var(--primary);
    }

    .nav-cta {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-left: 16px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: 30px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      text-align: center;
    }

    .btn-primary {
      background: linear-gradient(135deg, #0066ff, #00bbff);
      color: #ffffff !important;
      box-shadow: 0 6px 18px rgba(0, 102, 255, 0.3);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 24px rgba(0, 102, 255, 0.4);
    }

    .btn-secondary {
      background: #ffffff;
      border-color: #0066ff;
      color: #0066ff !important;
    }

    .btn-secondary:hover {
      background: #f0f6ff;
      transform: translateY(-2px);
    }

    .btn-sm {
      padding: 7px 16px;
      font-size: 0.85rem;
    }

    .nav-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
    }

    .nav-toggle span {
      display: block;
      width: 24px;
      height: 3px;
      margin: 4px 0;
      background-color: var(--text-main);
      transition: var(--transition);
      border-radius: 2px;
    }

    /* 页面分区公共头部 */
    .section-spacing {
      padding: 80px 0;
      position: relative;
    }

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

    .section-tag {
      display: inline-block;
      padding: 6px 14px;
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      color: var(--primary);
      background: rgba(0, 102, 255, 0.08);
      border-radius: 20px;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 14px;
    }

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

    /* 首屏 Hero 区域 (无图片) */
    .hero-section {
      padding: 80px 0 60px 0;
      background: radial-gradient(circle at 50% 0%, #e0edff 0%, #f4f8ff 70%, #ffffff 100%);
      position: relative;
      overflow: hidden;
      border-bottom: 1px solid var(--border-color);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 40px;
      align-items: center;
    }

    .hero-content {
      position: relative;
      z-index: 2;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      padding: 6px 16px;
      border-radius: 30px;
      border: 1px solid #d4e4fc;
      font-size: 0.85rem;
      font-weight: 600;
      color: #0056cc;
      margin-bottom: 20px;
      box-shadow: var(--shadow-sm);
    }

    .hero-badge .dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #00cc66;
      display: inline-block;
      animation: pulseDot 1.8s infinite;
    }

    @keyframes pulseDot {
      0% { transform: scale(0.9); opacity: 0.7; }
      50% { transform: scale(1.3); opacity: 1; }
      100% { transform: scale(0.9); opacity: 0.7; }
    }

    .hero-title {
      font-size: 2.8rem;
      font-weight: 900;
      line-height: 1.22;
      margin-bottom: 20px;
      color: #0d1e3a;
      letter-spacing: -0.5px;
    }

    .hero-title .highlight {
      background: linear-gradient(135deg, #0055ff, #00c3ff);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      display: inline-block;
    }

    .hero-lead {
      font-size: 1.15rem;
      color: var(--text-muted);
      margin-bottom: 32px;
      line-height: 1.6;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 36px;
    }

    .hero-actions .btn-portal {
      font-size: 1.1rem;
      padding: 13px 32px;
      border-radius: 35px;
      background: linear-gradient(135deg, #ff4e00, #ff8400);
      box-shadow: 0 8px 24px rgba(255, 80, 0, 0.35);
      color: #fff !important;
    }

    .hero-actions .btn-portal:hover {
      transform: translateY(-2px);
      box-shadow: 0 10px 28px rgba(255, 80, 0, 0.45);
    }

    .hero-highlights-pills {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .pill-item {
      font-size: 0.82rem;
      padding: 5px 12px;
      background: rgba(255, 255, 255, 0.85);
      border: 1px solid #d9e6f7;
      border-radius: 20px;
      color: #385072;
      font-weight: 500;
    }

    .hero-visual-card {
      background: #ffffff;
      border-radius: var(--radius-lg);
      padding: 28px;
      border: 1px solid #ddecff;
      box-shadow: var(--shadow-lg);
      position: relative;
    }

    .engine-terminal {
      background: #0f192c;
      border-radius: var(--radius-md);
      padding: 20px;
      color: #e2eeff;
      font-family: monospace;
      font-size: 0.85rem;
      margin-bottom: 20px;
      box-shadow: inset 0 2px 6px rgba(0,0,0,0.4);
    }

    .engine-terminal-bar {
      display: flex;
      gap: 6px;
      margin-bottom: 14px;
    }

    .term-dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
    }
    .td-red { background: #ff5f56; }
    .td-yellow { background: #ffbd2e; }
    .td-green { background: #27c93f; }

    .term-code {
      line-height: 1.7;
    }
    .code-cyan { color: #00d2ff; }
    .code-green { color: #52e396; }
    .code-orange { color: #ffb86c; }

    .hero-stats-row {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 14px;
    }

    .hero-stat-card {
      background: var(--bg-card-alt);
      padding: 14px;
      border-radius: var(--radius-sm);
      text-align: center;
      border: 1px solid #e1ecfc;
    }

    .stat-num {
      font-size: 1.45rem;
      font-weight: 800;
      color: var(--primary);
    }

    .stat-label {
      font-size: 0.78rem;
      color: var(--text-muted);
      margin-top: 2px;
    }

    /* 聚合模型展台 */
    .models-stream {
      background: #ffffff;
      padding: 24px 0;
      border-bottom: 1px solid var(--border-color);
    }

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

    .model-tag {
      padding: 6px 14px;
      background: #f4f8ff;
      border: 1px solid #dce8fa;
      border-radius: 8px;
      font-size: 0.88rem;
      font-weight: 600;
      color: #24416b;
      transition: var(--transition);
    }

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

    /* 卡片网格体系 */
    .card-grid-3 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
      gap: 24px;
    }

    .card-grid-4 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 20px;
    }

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

    .feature-card:hover {
      border-color: #bad3ff;
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }

    .feature-icon-box {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: linear-gradient(135deg, rgba(0, 102, 255, 0.1), rgba(0, 210, 255, 0.2));
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 18px;
      color: var(--primary);
      font-size: 1.4rem;
      font-weight: 700;
    }

    .feature-title {
      font-size: 1.22rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .feature-desc {
      font-size: 0.93rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .feature-meta {
      font-size: 0.82rem;
      color: #0066ff;
      background: #f0f7ff;
      padding: 4px 10px;
      border-radius: 6px;
      align-self: flex-start;
      font-weight: 600;
    }

    /* 评测与对比模块 */
    .eval-box {
      background: #ffffff;
      border: 1px solid #ddecff;
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
      margin-bottom: 40px;
    }

    .score-banner {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      background: linear-gradient(135deg, #091a38, #183363);
      color: #ffffff;
      border-radius: var(--radius-md);
      padding: 26px 32px;
      margin-bottom: 30px;
    }

    .score-left h3 {
      font-size: 1.5rem;
      margin-bottom: 6px;
      color: #ffffff;
    }

    .score-left p {
      color: #9ebde8;
      font-size: 0.95rem;
    }

    .score-right {
      text-align: right;
    }

    .score-stars {
      color: #ffb800;
      font-size: 1.3rem;
      margin-bottom: 4px;
    }

    .score-digits {
      font-size: 2.4rem;
      font-weight: 900;
      color: #00d2ff;
    }

    .score-max {
      font-size: 1rem;
      color: #bdd5f5;
    }

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

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

    .custom-table th,
    .custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.94rem;
    }

    .custom-table th {
      background: #f7faff;
      color: var(--text-main);
      font-weight: 700;
    }

    .custom-table td.highlight-col {
      background: #f4f9ff;
      font-weight: 600;
      color: var(--primary);
    }

    /* 案例中心 */
    .gallery-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }

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

    .gallery-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }

    .gallery-img-box {
      aspect-ratio: 16/9;
      background: #eaeff8;
      overflow: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .gallery-img-box.square-box {
      aspect-ratio: 1/1;
    }

    .gallery-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

    .gallery-card:hover .gallery-img-box img {
      transform: scale(1.04);
    }

    .gallery-info {
      padding: 20px;
    }

    .gallery-title {
      font-size: 1.12rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

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

    /* 流程步骤 */
    .steps-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
    }

    .step-box {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 24px;
      border: 1px solid var(--border-color);
      text-align: center;
      position: relative;
    }

    .step-idx {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--primary);
      color: #fff;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 14px auto;
    }

    .step-title {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 6px;
    }

    .step-desc {
      font-size: 0.86rem;
      color: var(--text-muted);
    }

    /* 客户评价 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 22px;
    }

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

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

    .review-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, #0066ff, #00d2ff);
      color: #ffffff;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.1rem;
    }

    .review-name {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
    }

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

    .review-text {
      font-size: 0.92rem;
      color: #3b4c63;
      line-height: 1.6;
    }

    /* FAQ 折叠 */
    .faq-wrapper {
      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-sm);
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-question {
      width: 100%;
      text-align: left;
      background: none;
      border: none;
      padding: 18px 22px;
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

    .faq-question:hover {
      background-color: #f7faff;
      color: var(--primary);
    }

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

    .faq-answer {
      display: none;
      padding: 0 22px 18px 22px;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.65;
      border-top: 1px dashed #f0f4f9;
    }

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

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

    /* 表单与需求匹配 */
    .form-box {
      background: #ffffff;
      border: 1px solid #dce8fa;
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
      max-width: 800px;
      margin: 0 auto;
    }

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

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

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

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

    .form-input,
    .form-select,
    .form-textarea {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid #ccd8e8;
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      outline: none;
      transition: var(--transition);
      background: #fdfefe;
    }

    .form-input:focus,
    .form-select:focus,
    .form-textarea:focus {
      border-color: var(--border-focus);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(0, 98, 255, 0.12);
    }

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

    /* 资讯与文章列表 */
    .articles-container {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      padding: 24px;
      margin-top: 24px;
    }

    .article-links-row {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 14px;
    }

    .article-link-tag {
      font-size: 0.88rem;
      padding: 6px 14px;
      background: #f1f6fd;
      border-radius: 6px;
      border: 1px solid #d9e6f7;
      color: #24416b;
    }

    .article-link-tag:hover {
      background: var(--primary);
      color: #ffffff;
    }

    /* 页脚 */
    .site-footer {
      background: #0d1626;
      color: #92a4bc;
      padding: 60px 0 24px 0;
      border-top: 1px solid #1a2a44;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.2fr 1fr 1fr 1fr;
      gap: 30px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      font-size: 1.05rem;
      color: #ffffff;
      margin-bottom: 16px;
      font-weight: 700;
    }

    .footer-col p {
      font-size: 0.88rem;
      line-height: 1.7;
      margin-bottom: 8px;
    }

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

    .footer-links li {
      margin-bottom: 8px;
    }

    .footer-links a {
      color: #92a4bc;
      font-size: 0.88rem;
    }

    .footer-links a:hover {
      color: #00d2ff;
    }

    .footer-qr-box {
      background: #18253d;
      padding: 12px;
      border-radius: var(--radius-sm);
      display: inline-block;
      text-align: center;
    }

    .footer-qr-box img {
      width: 110px;
      height: 110px;
      object-fit: cover;
      margin: 0 auto 6px auto;
      border-radius: 4px;
    }

    .footer-qr-tip {
      font-size: 0.78rem;
      color: #bcd0ea;
    }

    .footer-bottom {
      border-top: 1px solid #18253c;
      padding-top: 20px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      font-size: 0.84rem;
      gap: 12px;
    }

    .friendly-links {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      align-items: center;
    }

    .friendly-links a {
      color: #7b8ea6;
    }

    .friendly-links a:hover {
      color: #ffffff;
    }

    /* 悬浮组件 */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 24px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      color: var(--primary);
      border: 1px solid #d4e2f5;
      box-shadow: 0 4px 16px rgba(0,0,0,0.12);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      font-size: 1.1rem;
      transition: var(--transition);
      text-decoration: none;
    }

    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: translateY(-3px);
    }

    .float-btn.float-kf {
      background: linear-gradient(135deg, #0066ff, #00bbff);
      color: #ffffff;
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 30px;
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-title {
        font-size: 2.2rem;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 16px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.08);
        border-bottom: 1px solid var(--border-color);
      }

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

      .nav-links li {
        width: 100%;
      }

      .nav-links li a {
        padding: 12px 16px;
      }

      .nav-toggle {
        display: block;
      }

      .form-grid {
        grid-template-columns: 1fr;
      }

      .form-group.full-width {
        grid-column: span 1;
      }

      .footer-grid {
        grid-template-columns: 1fr;
      }

      .score-banner {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
      }

      .score-right {
        text-align: left;
      }

      .section-title {
        font-size: 1.7rem;
      }

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