:root {
      --primary: #10b981;
      --primary-bright: #00c853;
      --primary-hover: #059669;
      --primary-light: #ecfdf5;
      --primary-border: #a7f3d0;
      --text-dark: #0f172a;
      --text-gray: #475569;
      --text-muted: #64748b;
      --bg-main: #f8fafc;
      --bg-white: #ffffff;
      --bg-card: #ffffff;
      --border-color: #e2e8f0;
      --shadow-sm: 0 2px 4px rgba(16, 185, 129, 0.05);
      --shadow-md: 0 10px 25px -5px rgba(16, 185, 129, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
      --shadow-lg: 0 20px 35px -10px rgba(16, 185, 129, 0.15);
      --radius: 12px;
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    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-dark);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
      background: linear-gradient(180deg, #f0fdf4 0%, #f8fafc 400px, #ffffff 100%);
    }

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

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

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
      width: 100%;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--primary-border);
      box-shadow: 0 4px 20px rgba(16, 185, 129, 0.08);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }

    .brand-box {
      display: flex;
      align-items: center;
      gap: 15px;
    }

    .ai-page-logo {
      height: 42px;
      width: auto;
      display: block;
    }

    .brand-name {
      font-size: 20px;
      font-weight: 800;
      color: var(--text-dark);
      letter-spacing: -0.5px;
    }

    .brand-tag {
      font-size: 11px;
      background: var(--primary-light);
      color: var(--primary-hover);
      padding: 2px 8px;
      border-radius: 20px;
      border: 1px solid var(--primary-border);
      font-weight: 600;
    }

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

    .nav-links li a {
      display: block;
      padding: 8px 14px;
      font-size: 14px;
      font-weight: 600;
      color: var(--text-dark);
      border-radius: 6px;
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary-bright);
      background: var(--primary-light);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 14px;
      font-weight: 700;
      border-radius: 8px;
      cursor: pointer;
      transition: var(--transition);
      border: none;
      text-align: center;
      gap: 8px;
    }

    .btn-primary {
      background: linear-gradient(135deg, #10b981 0%, #059669 100%);
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(16, 185, 129, 0.35);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, #00c853 0%, #047857 100%);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(16, 185, 129, 0.45);
    }

    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary-hover) !important;
      background: transparent;
    }

    .btn-outline:hover {
      background: var(--primary-light);
      transform: translateY(-2px);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-dark);
      cursor: pointer;
    }

    /* 首屏 Hero (无图片) */
    .hero-section {
      padding: 90px 0 70px;
      background: radial-gradient(circle at 50% 10%, rgba(16, 185, 129, 0.15) 0%, rgba(255, 255, 255, 0) 70%);
      text-align: center;
      position: relative;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: var(--primary-light);
      border: 1px solid var(--primary-border);
      border-radius: 50px;
      color: var(--primary-hover);
      font-size: 13px;
      font-weight: 700;
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 42px;
      font-weight: 900;
      line-height: 1.25;
      color: var(--text-dark);
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-title span {
      background: linear-gradient(135deg, #059669 0%, #00c853 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--text-gray);
      max-width: 820px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }

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

    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 1000px;
      margin: 0 auto;
      padding: 24px;
      background: #ffffff;
      border: 1px solid var(--primary-border);
      border-radius: 16px;
      box-shadow: var(--shadow-md);
    }

    .metric-card h4 {
      font-size: 28px;
      font-weight: 800;
      color: var(--primary-hover);
      margin-bottom: 4px;
    }

    .metric-card p {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* Section 通用 Header */
    .section-padding {
      padding: 80px 0;
    }

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

    .section-tag {
      font-size: 13px;
      font-weight: 800;
      color: var(--primary-hover);
      text-transform: uppercase;
      letter-spacing: 1px;
      background: var(--primary-light);
      padding: 4px 12px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-dark);
      margin-bottom: 14px;
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-gray);
    }

    /* 模型聚合与平台介绍 */
    .platform-bg {
      background: #ffffff;
      border-y: 1px solid var(--border-color);
    }

    .model-tags-wrapper {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }

    .model-tag-item {
      padding: 8px 16px;
      background: var(--bg-main);
      border: 1px solid var(--border-color);
      border-radius: 30px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-dark);
      transition: var(--transition);
    }

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

    .feature-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }

    .card-style {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 30px;
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
    }

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

    .card-icon {
      width: 50px;
      height: 50px;
      background: var(--primary-light);
      color: var(--primary-hover);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      font-weight: 800;
      margin-bottom: 20px;
    }

    .card-title {
      font-size: 20px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 12px;
    }

    .card-desc {
      font-size: 14px;
      color: var(--text-gray);
      line-height: 1.6;
    }

    /* 核心场景一站式制作 */
    .scenarios-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .scenario-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 10px;
      padding: 20px;
      transition: var(--transition);
    }

    .scenario-card:hover {
      border-color: var(--primary);
      background: var(--primary-light);
    }

    .scenario-card h4 {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .scenario-card p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 对比评测 9.9分 */
    .comparison-section {
      background: linear-gradient(180deg, #ecfdf5 0%, #ffffff 100%);
      border-y: 1px solid var(--primary-border);
    }

    .review-score-box {
      background: #ffffff;
      border: 2px solid var(--primary);
      border-radius: 16px;
      padding: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 40px;
      box-shadow: var(--shadow-md);
      flex-wrap: wrap;
      gap: 20px;
    }

    .score-left h3 {
      font-size: 24px;
      font-weight: 800;
      color: var(--text-dark);
    }

    .score-stars {
      color: #f59e0b;
      font-size: 22px;
      margin-top: 6px;
    }

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

    .score-big {
      font-size: 48px;
      font-weight: 900;
      color: var(--primary-hover);
      line-height: 1;
    }

    .score-total {
      font-size: 14px;
      color: var(--text-muted);
    }

    .comp-table-wrapper {
      overflow-x: auto;
      background: #ffffff;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

    .comp-table th, .comp-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 14px;
    }

    .comp-table th {
      background: var(--bg-main);
      font-weight: 700;
      color: var(--text-dark);
    }

    .comp-table td.highlight {
      background: var(--primary-light);
      font-weight: 700;
      color: var(--primary-hover);
    }

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

    .step-card {
      background: #ffffff;
      padding: 24px;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      position: relative;
    }

    .step-num {
      width: 36px;
      height: 36px;
      background: var(--primary-hover);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 16px;
      margin-bottom: 16px;
    }

    /* Token 比价 */
    .token-box {
      background: #ffffff;
      border-radius: 16px;
      padding: 30px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .token-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-top: 20px;
    }

    .token-item {
      padding: 20px;
      background: var(--bg-main);
      border-radius: 10px;
      border: 1px solid var(--border-color);
    }

    .token-item h5 {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 8px;
    }

    .token-price {
      font-size: 20px;
      font-weight: 800;
      color: var(--primary-hover);
    }

    /* 案例展示区（展示图片） */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .case-card {
      background: #ffffff;
      border-radius: 12px;
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

    .case-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }

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

    .case-info {
      padding: 20px;
    }

    .case-info h4 {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .case-info p {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 客户评价 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .testi-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }

    .testi-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
    }

    .avatar-placeholder {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary-hover);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 16px;
    }

    .user-info h5 {
      font-size: 15px;
      font-weight: 700;
    }

    .user-info span {
      font-size: 12px;
      color: var(--text-muted);
    }

    .testi-text {
      font-size: 14px;
      color: var(--text-gray);
      line-height: 1.6;
    }

    /* FAQ 折叠面板 */
    .faq-container {
      max-width: 900px;
      margin: 0 auto;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 10px;
      margin-bottom: 12px;
      overflow: hidden;
    }

    .faq-question {
      padding: 18px 24px;
      font-size: 16px;
      font-weight: 700;
      color: var(--text-dark);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: var(--transition);
    }

    .faq-question:hover {
      background: var(--primary-light);
    }

    .faq-toggle-icon {
      font-size: 18px;
      color: var(--primary-hover);
      transition: var(--transition);
    }

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

    .faq-answer-inner {
      padding: 0 24px 20px;
      font-size: 14px;
      color: var(--text-gray);
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      max-height: 250px;
    }

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

    /* 文章列表 & 智能需求匹配 / 表单区 */
    .contact-form-section {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
    }

    .form-wrapper {
      max-width: 700px;
      margin: 0 auto;
      background: var(--bg-main);
      padding: 36px;
      border-radius: 16px;
      border: 1px solid var(--border-color);
    }

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

    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 8px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 14px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      background: #ffffff;
      color: var(--text-dark);
      outline: none;
      transition: var(--transition);
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.15);
    }

    textarea.form-control {
      min-height: 120px;
      resize: vertical;
    }

    /* 资讯及文章链接区 */
    .articles-box {
      background: var(--bg-main);
      padding: 30px;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      margin-bottom: 40px;
    }

    .article-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 16px;
    }

    .article-link-item {
      padding: 6px 14px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 6px;
      font-size: 13px;
      color: var(--text-dark);
    }

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

    /* 页脚 */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      font-size: 14px;
    }

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

    .footer-col h4 {
      color: #ffffff;
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 20px;
    }

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

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

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

    .footer-links a:hover {
      color: var(--primary-bright);
    }

    .friend-links-box {
      border-top: 1px solid #334155;
      padding-top: 24px;
      margin-top: 30px;
    }

    .friend-links-box h5 {
      color: #ffffff;
      font-size: 14px;
      margin-bottom: 12px;
    }

    .friend-links-flex {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }

    .friend-links-flex a {
      color: #94a3b8;
      font-size: 13px;
    }

    .friend-links-flex a:hover {
      color: var(--primary-bright);
    }

    .copyright-box {
      border-top: 1px solid #1e293b;
      margin-top: 30px;
      padding-top: 20px;
      text-align: center;
      font-size: 13px;
      color: #64748b;
    }

    /* 浮动客服 */
    .floating-widget {
      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(--primary-hover);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
      cursor: pointer;
      font-size: 18px;
      border: none;
      transition: var(--transition);
    }

    .float-btn:hover {
      background: var(--primary-bright);
      transform: scale(1.1);
    }

    .float-qr-pop {
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #ffffff;
      padding: 12px;
      border-radius: 12px;
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
      display: none;
      width: 140px;
      text-align: center;
    }

    .float-qr-pop img {
      width: 100%;
      height: auto;
      border-radius: 6px;
    }

    .float-qr-pop p {
      font-size: 11px;
      color: var(--text-dark);
      margin-top: 6px;
      font-weight: 700;
    }

    .float-widget-wrapper:hover .float-qr-pop {
      display: block;
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .hero-metrics,
      .feature-grid-3,
      .scenarios-grid,
      .process-steps,
      .token-grid,
      .cases-grid,
      .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .nav-links {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
    }

    @media (max-width: 640px) {
      .hero-title {
        font-size: 28px;
      }
      .hero-metrics,
      .feature-grid-3,
      .scenarios-grid,
      .process-steps,
      .token-grid,
      .cases-grid,
      .testimonials-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-cta-group {
        flex-direction: column;
      }
      .btn {
        width: 100%;
      }
    }