:root {
      --primary: #4f46e5;
      --primary-light: #6366f1;
      --accent: #f43f5e;
      --accent-alt: #06b6d4;
      --neon-yellow: #eab308;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --border-color: #e2e8f0;
      --border-highlight: #c7d2fe;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 8px 20px -4px rgba(79, 70, 229, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.02);
      --shadow-lg: 0 16px 32px -8px rgba(79, 70, 229, 0.14);
      --transition: all 0.25s 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-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 999;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
    }

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

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

    .brand-wrap img.ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }

    .brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: var(--text-main);
      background: linear-gradient(135deg, #4f46e5 0%, #db2777 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

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

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

    .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: #eef2ff;
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 0.95rem;
      font-weight: 600;
      padding: 10px 22px;
      border-radius: 9999px;
      border: 1px solid transparent;
      cursor: pointer;
      transition: var(--transition);
      line-height: 1.2;
    }

    .btn-primary {
      background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 50%, #ec4899 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(99, 102, 241, 0.35);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(99, 102, 241, 0.45);
    }

    .btn-outline {
      border-color: #c7d2fe;
      background: #ffffff;
      color: var(--primary);
    }

    .btn-outline:hover {
      border-color: var(--primary);
      background: #eef2ff;
    }

    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 6px;
    }

    .menu-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--text-main);
      transition: var(--transition);
    }

    /* 首屏 Hero (无图纯UI视觉) */
    .hero-section {
      padding: 70px 0 50px;
      position: relative;
      overflow: hidden;
      background: radial-gradient(circle at 80% 20%, rgba(244, 63, 94, 0.08) 0%, transparent 40%),
                  radial-gradient(circle at 10% 80%, rgba(79, 70, 229, 0.08) 0%, transparent 40%),
                  #ffffff;
      border-bottom: 1px solid var(--border-color);
    }

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

    .hero-badge-wrap {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #fdf2f8;
      border: 1px solid #fbcfe8;
      padding: 6px 14px;
      border-radius: 9999px;
      margin-bottom: 20px;
    }

    .hero-badge-tag {
      background: #f43f5e;
      color: #ffffff;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 2px 8px;
      border-radius: 9999px;
      text-transform: uppercase;
    }

    .hero-badge-text {
      font-size: 0.85rem;
      color: #9d174d;
      font-weight: 600;
    }

    .hero-title {
      font-size: 2.5rem;
      font-weight: 900;
      line-height: 1.25;
      letter-spacing: -0.5px;
      color: #0f172a;
      margin-bottom: 20px;
    }

    .hero-title-gradient {
      background: linear-gradient(135deg, #4f46e5 20%, #db2777 60%, #ea580c 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      display: inline-block;
    }

    .hero-desc {
      font-size: 1.08rem;
      color: var(--text-muted);
      margin-bottom: 30px;
      max-width: 580px;
    }

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

    .btn-hero-lead {
      font-size: 1.05rem;
      padding: 13px 32px;
    }

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

    .hero-feat-item {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 0.88rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    .hero-feat-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #10b981;
    }

    /* 首屏右侧纯CSS交互控制板 */
    .hero-dashboard-card {
      background: #ffffff;
      border: 1px solid var(--border-highlight);
      border-radius: var(--radius-lg);
      padding: 28px;
      box-shadow: var(--shadow-lg);
      position: relative;
    }

    .card-top-bar {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding-bottom: 16px;
      border-bottom: 1px solid #f1f5f9;
      margin-bottom: 20px;
    }

    .card-title-group {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .pulsing-indicator {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: #06b6d4;
      box-shadow: 0 0 0 4px rgba(6, 182, 212, 0.2);
    }

    .card-top-title {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .dashboard-metrics {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 14px;
      margin-bottom: 20px;
    }

    .metric-box {
      background: #f8fafc;
      border: 1px solid #edf2f7;
      padding: 14px;
      border-radius: var(--radius-md);
      transition: var(--transition);
    }

    .metric-box:hover {
      background: #f1f5f9;
      transform: translateY(-2px);
    }

    .metric-name {
      font-size: 0.8rem;
      color: var(--text-light);
      margin-bottom: 4px;
    }

    .metric-value {
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--text-main);
    }

    .metric-value span {
      font-size: 0.8rem;
      color: #059669;
      margin-left: 4px;
    }

    .active-engine-bar {
      background: #eef2ff;
      border-radius: var(--radius-sm);
      padding: 12px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .engine-text {
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--primary);
    }

    .engine-status-pill {
      font-size: 0.75rem;
      background: #4f46e5;
      color: #ffffff;
      padding: 2px 10px;
      border-radius: 9999px;
    }

    /* 通用Section布局 */
    .section-block {
      padding: 70px 0;
      border-bottom: 1px solid var(--border-color);
      position: relative;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 48px;
    }

    .section-eyebrow {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 700;
      letter-spacing: 1px;
      text-transform: uppercase;
      color: #db2777;
      background: #fdf2f8;
      padding: 4px 14px;
      border-radius: 9999px;
      margin-bottom: 12px;
      border: 1px solid #fce7f3;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .section-subtitle {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 网格与卡片通用 */
    .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: 28px;
      align-items: center;
    }

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

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

    .card-icon-badge {
      width: 44px;
      height: 44px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
      font-size: 1.25rem;
      font-weight: 800;
      color: #ffffff;
      background: linear-gradient(135deg, #4f46e5, #06b6d4);
    }

    .card h3 {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.55;
    }

    /* 关于我们 & 平台介绍 */
    .about-lead-box {
      background: linear-gradient(135deg, #f0fdf4 0%, #ecfeff 100%);
      border: 1px solid #ccfbf1;
      padding: 32px;
      border-radius: var(--radius-lg);
      margin-bottom: 36px;
    }

    .about-lead-title {
      font-size: 1.25rem;
      font-weight: 800;
      color: #0f766e;
      margin-bottom: 10px;
    }

    .about-lead-desc {
      font-size: 1rem;
      color: #134e4a;
      line-height: 1.7;
    }

    /* 模块：一站式制作与场景体系 */
    .scenario-pill-list {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 14px;
    }

    .scenario-pill {
      background: #f1f5f9;
      color: #334155;
      font-size: 0.78rem;
      font-weight: 600;
      padding: 4px 10px;
      border-radius: 6px;
    }

    /* 对比评测卡片与评分 */
    .review-score-hero {
      background: linear-gradient(135deg, #4338ca 0%, #6d28d9 100%);
      color: #ffffff;
      padding: 32px;
      border-radius: var(--radius-lg);
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 30px;
      box-shadow: var(--shadow-lg);
    }

    .score-left h3 {
      font-size: 1.5rem;
      font-weight: 800;
      margin-bottom: 6px;
    }

    .score-left p {
      color: #c7d2fe;
      font-size: 0.95rem;
    }

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

    .score-digits {
      font-size: 3rem;
      font-weight: 900;
      line-height: 1;
      color: #facc15;
    }

    .score-digits span {
      font-size: 1.2rem;
      color: #ffffff;
    }

    .score-stars {
      color: #facc15;
      font-size: 1.1rem;
      margin-top: 4px;
    }

    .compare-table-wrap {
      overflow-x: auto;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }

    .compare-table th, 
    .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.92rem;
    }

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

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

    .badge-win {
      color: #059669;
      font-weight: 700;
      background: #ecfdf5;
      padding: 3px 8px;
      border-radius: 4px;
      display: inline-block;
    }

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

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

    .step-number {
      font-size: 1.8rem;
      font-weight: 900;
      color: #c7d2fe;
      margin-bottom: 8px;
      line-height: 1;
    }

    /* 案例展示区与媒体整合 */
    .case-visual-item {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      background: #ffffff;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .case-visual-item:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-2px);
    }

    .case-img-holder {
      width: 100%;
      height: 200px;
      overflow: hidden;
      background: #f1f5f9;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .case-img-holder img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }

    .case-info {
      padding: 18px;
    }

    .case-info h4 {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 6px;
      color: var(--text-main);
    }

    .case-info p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 标签云与支持模型展示 */
    .models-tags-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      padding: 24px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
    }

    .model-tag {
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      padding: 6px 14px;
      border-radius: 9999px;
      font-size: 0.85rem;
      font-weight: 600;
      color: #334155;
      transition: var(--transition);
    }

    .model-tag:hover {
      background: #4f46e5;
      color: #ffffff;
      border-color: #4f46e5;
    }

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

    .testimonial-text {
      font-size: 0.93rem;
      color: var(--text-main);
      line-height: 1.6;
      margin-bottom: 18px;
      position: relative;
    }

    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 14px;
    }

    .avatar-placeholder {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: linear-gradient(135deg, #ec4899, #f59e0b);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 0.85rem;
    }

    .user-meta-name {
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--text-main);
    }

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

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

    .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(--border-highlight);
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 18px 24px;
      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-icon {
      font-size: 1.2rem;
      font-weight: 400;
      color: var(--primary);
      transition: transform 0.2s ease;
    }

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

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

    .faq-answer-inner {
      padding: 0 24px 20px;
      font-size: 0.93rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 表单与需求匹配 */
    .form-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }

    .form-group {
      margin-bottom: 18px;
    }

    .form-label {
      display: block;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 0.92rem;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      background: #f8fafc;
      color: var(--text-main);
      transition: var(--transition);
    }

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

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

    /* 最新资讯文章列表 */
    .article-listing {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .article-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 14px 18px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      transition: var(--transition);
    }

    .article-row:hover {
      border-color: var(--border-highlight);
      background: #f8fafc;
      transform: translateX(4px);
    }

    .article-link {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .article-meta-badge {
      font-size: 0.75rem;
      padding: 2px 8px;
      border-radius: 4px;
      background: #ede9fe;
      color: #6d28d9;
      font-weight: 700;
    }

    /* 底部专属布局 */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      border-top: 1px solid #1e293b;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.2fr 1fr 1fr 1fr;
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-col h5 {
      color: #f8fafc;
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 16px;
    }

    .footer-col p {
      font-size: 0.88rem;
      line-height: 1.6;
      margin-bottom: 10px;
    }

    .footer-links-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .footer-links-list a {
      font-size: 0.88rem;
      color: #94a3b8;
    }

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

    .qrcode-wrapper {
      background: #ffffff;
      padding: 8px;
      border-radius: var(--radius-sm);
      display: inline-block;
      max-width: 120px;
      margin-top: 6px;
    }

    .qrcode-wrapper img {
      width: 100%;
      height: auto;
      display: block;
    }

    .friend-links-row {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      margin-top: 24px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 16px;
      font-size: 0.85rem;
    }

    .friend-links-row span {
      color: #f8fafc;
      font-weight: 600;
    }

    .friend-links-row a {
      color: #94a3b8;
    }

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

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      margin-top: 24px;
      text-align: center;
      font-size: 0.82rem;
      color: #64748b;
    }

    /* 浮动客服入口与返回顶部 */
    .floating-tools {
      position: fixed;
      right: 20px;
      bottom: 24px;
      z-index: 990;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: var(--primary);
      font-weight: 700;
      font-size: 0.9rem;
      transition: var(--transition);
    }

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

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-grid, .grid-2 {
        grid-template-columns: 1fr;
      }
      .grid-3, .steps-chain {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .menu-toggle {
        display: flex;
      }
      .nav-menu {
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        border-bottom: 1px solid var(--border-color);
        padding: 20px;
        box-shadow: var(--shadow-md);
        display: none;
      }
      .nav-menu.active {
        display: block;
      }
      .nav-links {
        flex-direction: column;
        align-items: flex-start;
        width: 100%;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        width: 100%;
        padding: 10px 0;
      }
    }

    @media (max-width: 640px) {
      .hero-title {
        font-size: 1.85rem;
      }
      .grid-3, .grid-4, .steps-chain, .footer-grid {
        grid-template-columns: 1fr;
      }
      .header-actions .btn-outline {
        display: none;
      }
      .review-score-hero {
        flex-direction: column;
        text-align: center;
        gap: 18px;
      }
      .score-right {
        text-align: center;
      }
    }