:root {
      --primary: #FF5E1E;
      --primary-hover: #E4480A;
      --primary-light: #FFF2EB;
      --primary-gradient: linear-gradient(135deg, #FF5E1E 0%, #FF8C42 100%);
      --accent: #FFA726;
      --dark: #1E232A;
      --gray-deep: #4A5568;
      --gray-light: #718096;
      --bg-warm: #FFFDFB;
      --bg-section: #FAEDE5;
      --card-bg: #FFFFFF;
      --border-color: #F7DED0;
      --shadow-sm: 0 4px 12px rgba(255, 94, 30, 0.06);
      --shadow-md: 0 10px 24px rgba(255, 94, 30, 0.1);
      --shadow-lg: 0 18px 36px rgba(255, 94, 30, 0.14);
      --radius: 12px;
      --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 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-warm);
      color: var(--dark);
      line-height: 1.65;
      overflow-x: hidden;
      background-image: radial-gradient(circle at 10% 10%, rgba(255, 94, 30, 0.03) 0%, transparent 40%),
                        radial-gradient(circle at 90% 90%, rgba(255, 167, 38, 0.04) 0%, transparent 40%);
    }

    a {
      text-decoration: none;
      color: inherit;
      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: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    }

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

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

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

    .brand-title {
      font-size: 20px;
      font-weight: 700;
      color: var(--dark);
      letter-spacing: 0.5px;
    }

    .brand-badge {
      background: var(--primary-light);
      color: var(--primary);
      font-size: 11px;
      padding: 2px 8px;
      border-radius: 20px;
      font-weight: 600;
      border: 1px solid rgba(255, 94, 30, 0.2);
    }

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

    .nav-links li a {
      padding: 10px 14px;
      font-size: 15px;
      font-weight: 500;
      color: var(--gray-deep);
      border-radius: 6px;
      display: block;
    }

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

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      border-radius: 8px;
      font-size: 15px;
      font-weight: 600;
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      white-space: nowrap;
    }

    .btn-primary {
      background: var(--primary-gradient);
      color: #fff !important;
      box-shadow: 0 4px 14px rgba(255, 94, 30, 0.35);
    }

    .btn-primary:hover {
      box-shadow: 0 6px 20px rgba(255, 94, 30, 0.5);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: #FFF;
      color: var(--primary) !important;
      border-color: var(--primary);
    }

    .btn-outline:hover {
      background: var(--primary-light);
    }

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

    /* 首屏纯代码视觉 (禁止图片) */
    .hero-section {
      padding: 70px 0 60px;
      position: relative;
      background: linear-gradient(180deg, rgba(255, 242, 235, 0.6) 0%, rgba(255, 253, 251, 1) 100%);
      border-bottom: 1px solid var(--border-color);
    }

    .hero-content {
      text-align: center;
      max-width: 880px;
      margin: 0 auto;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #FFF;
      border: 1px solid #FFD3BF;
      border-radius: 30px;
      color: var(--primary);
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }

    .hero-tag-dot {
      width: 8px;
      height: 8px;
      background: var(--primary);
      border-radius: 50%;
      animation: pulse 1.6s infinite;
    }

    @keyframes pulse {
      0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(255, 94, 30, 0.7); }
      70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(255, 94, 30, 0); }
      100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(255, 94, 30, 0); }
    }

    .hero-title {
      font-size: 38px;
      font-weight: 800;
      line-height: 1.35;
      color: var(--dark);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title span {
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--gray-deep);
      margin-bottom: 34px;
      line-height: 1.6;
    }

    .hero-actions {
      display: flex;
      justify-content: center;
      gap: 16px;
      margin-bottom: 40px;
      flex-wrap: wrap;
    }

    .btn-hero {
      padding: 14px 34px;
      font-size: 17px;
      border-radius: 10px;
    }

    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
      margin-top: 40px;
    }

    .metric-card {
      background: #FFFFFF;
      padding: 22px 18px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }

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

    .metric-num {
      font-size: 28px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 6px;
      font-family: inherit;
    }

    .metric-label {
      font-size: 13px;
      color: var(--gray-deep);
      font-weight: 500;
    }

    /* 区域通配样式 */
    .section {
      padding: 72px 0;
      position: relative;
    }

    .section-alt {
      background-color: var(--bg-section);
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }

    .section-header {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 46px;
    }

    .section-subtitle {
      color: var(--primary);
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1.5px;
      margin-bottom: 8px;
      display: block;
    }

    .section-title {
      font-size: 30px;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 14px;
    }

    .section-desc {
      font-size: 15px;
      color: var(--gray-light);
      line-height: 1.6;
    }

    /* 模型滚动标签云 */
    .models-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 20px;
    }

    .model-tag {
      background: #FFF;
      border: 1px solid #FFE0D2;
      color: #333;
      padding: 7px 15px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      box-shadow: 0 2px 6px rgba(0,0,0,0.02);
      transition: var(--transition);
    }

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

    /* 卡片网格 */
    .card-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 22px;
    }

    .feature-card {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 26px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      height: 100%;
      position: relative;
    }

    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }

    .feature-icon-badge {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      font-size: 18px;
      margin-bottom: 18px;
    }

    .feature-card h3 {
      font-size: 18px;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 10px;
    }

    .feature-card p {
      font-size: 14px;
      color: var(--gray-deep);
      line-height: 1.6;
      flex-grow: 1;
    }

    .feature-meta {
      margin-top: 16px;
      padding-top: 14px;
      border-top: 1px dashed var(--border-color);
      font-size: 12px;
      color: var(--primary);
      font-weight: 600;
    }

    /* 图文两列通用排版 */
    .media-block {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      align-items: center;
      margin-bottom: 40px;
    }

    .media-block.reverse {
      direction: rtl;
    }

    .media-block.reverse .media-text {
      direction: ltr;
    }

    .media-img-wrap {
      width: 100%;
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      background: #FFF;
    }

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

    .media-img-wrap:hover img {
      transform: scale(1.02);
    }

    .media-text h3 {
      font-size: 24px;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 14px;
    }

    .media-text p {
      font-size: 15px;
      color: var(--gray-deep);
      margin-bottom: 18px;
      line-height: 1.7;
    }

    .media-check-list {
      list-style: none;
      margin-bottom: 22px;
    }

    .media-check-list li {
      font-size: 14px;
      color: var(--dark);
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .media-check-list li::before {
      content: "✓";
      color: var(--primary);
      font-weight: 800;
    }

    /* 标准流程时间轴 */
    .step-timeline {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

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

    .step-number {
      font-size: 26px;
      font-weight: 900;
      color: var(--primary);
      opacity: 0.3;
      position: absolute;
      top: 12px;
      right: 18px;
    }

    .step-item h4 {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--dark);
    }

    .step-item p {
      font-size: 13px;
      color: var(--gray-deep);
    }

    /* 对比评测表格 */
    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #FFF;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      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 #F3F4F6;
      font-size: 14px;
    }

    .compare-table th {
      background: #FFF9F5;
      font-weight: 700;
      color: var(--dark);
    }

    .compare-table th.highlight-col,
    .compare-table td.highlight-col {
      background: #FFF3EB;
      color: var(--primary);
      font-weight: 600;
      border-left: 2px solid #FFC9B3;
      border-right: 2px solid #FFC9B3;
    }

    .score-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: #FFF;
      border: 1px solid var(--primary);
      padding: 4px 10px;
      border-radius: 6px;
      font-weight: 700;
      color: var(--primary);
    }

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

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

    .testimonial-card:hover {
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }

    .testimonial-content {
      font-size: 14px;
      color: var(--gray-deep);
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #F5EAE4;
      padding-top: 14px;
    }

    .avatar-char {
      width: 40px;
      height: 40px;
      background: var(--primary-gradient);
      color: #fff;
      font-weight: 700;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 16px;
    }

    .user-info h5 {
      font-size: 14px;
      color: var(--dark);
      font-weight: 700;
    }

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

    /* FAQ 手风琴面板 */
    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      background: #FFF;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      margin-bottom: 12px;
      overflow: hidden;
      transition: var(--transition);
    }

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

    .faq-question {
      padding: 18px 22px;
      font-weight: 700;
      color: var(--dark);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #FFF;
      user-select: none;
    }

    .faq-question::after {
      content: "+";
      font-size: 20px;
      color: var(--primary);
      transition: transform 0.3s ease;
    }

    .faq-item.active .faq-question::after {
      content: "-";
      transform: rotate(180deg);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #FFFAF8;
      color: var(--gray-deep);
      font-size: 14px;
      padding: 0 22px;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 16px 22px 20px;
      border-top: 1px solid #FFE7DB;
    }

    /* 文章列表 */
    .article-box {
      background: #FFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      margin-bottom: 24px;
    }

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

    .article-link-tag {
      background: var(--primary-light);
      color: var(--primary);
      padding: 6px 14px;
      border-radius: 6px;
      font-size: 13px;
      font-weight: 500;
    }

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

    /* 需求匹配与联系我们表单 */
    .contact-card-wrap {
      background: #FFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      box-shadow: var(--shadow-md);
      overflow: hidden;
      display: grid;
      grid-template-columns: 1fr 1.2fr;
    }

    .contact-info-panel {
      background: var(--primary-gradient);
      color: #FFF;
      padding: 40px 32px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .contact-info-panel h3 {
      font-size: 24px;
      margin-bottom: 14px;
      font-weight: 700;
    }

    .contact-info-panel p {
      font-size: 14px;
      opacity: 0.9;
      margin-bottom: 24px;
      line-height: 1.6;
    }

    .contact-details {
      list-style: none;
    }

    .contact-details li {
      font-size: 14px;
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .qr-wrap {
      margin-top: 24px;
      background: rgba(255, 255, 255, 0.15);
      padding: 14px;
      border-radius: 10px;
      display: inline-block;
      width: fit-content;
    }

    .qr-wrap img {
      width: 100px;
      height: 100px;
      display: block;
      border-radius: 6px;
      background: #FFF;
    }

    .form-panel {
      padding: 40px 32px;
    }

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

    .form-group label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      color: var(--dark);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 11px 14px;
      border: 1px solid #D1D5DB;
      border-radius: 6px;
      font-size: 14px;
      transition: var(--transition);
      background: #FAFAFA;
      color: var(--dark);
    }

    .form-control:focus {
      border-color: var(--primary);
      outline: none;
      background: #FFF;
      box-shadow: 0 0 0 3px rgba(255, 94, 30, 0.12);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 90px;
    }

    /* 友情链接与底部栏 */
    .links-section {
      background: #FFF;
      border-top: 1px solid var(--border-color);
      padding: 30px 0;
    }

    .links-title {
      font-size: 14px;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 12px;
    }

    .links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .links-wrap a {
      font-size: 13px;
      color: var(--gray-deep);
    }

    .links-wrap a:hover {
      color: var(--primary);
      text-decoration: underline;
    }

    .site-footer {
      background: #191C20;
      color: #A0AEC0;
      padding: 40px 0 30px;
      border-top: 1px solid #2D3748;
    }

    .footer-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
      font-size: 13px;
    }

    .footer-brand {
      color: #FFF;
      font-size: 16px;
      font-weight: 700;
    }

    .footer-links {
      display: flex;
      gap: 16px;
    }

    .footer-links a {
      color: #CBD5E0;
    }

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

    /* 浮动工具栏 */
    .float-toolbar {
      position: fixed;
      right: 20px;
      bottom: 40px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      z-index: 999;
    }

    .float-btn {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: #FFF;
      box-shadow: 0 4px 14px rgba(0,0,0,0.15);
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      cursor: pointer;
      transition: var(--transition);
      font-size: 13px;
      font-weight: bold;
    }

    .float-btn:hover {
      background: var(--primary);
      color: #FFF;
      transform: translateY(-2px);
    }

    /* 响应式断点 */
    @media (max-width: 992px) {
      .hero-metrics {
        grid-template-columns: repeat(2, 1fr);
      }
      .media-block, .contact-card-wrap {
        grid-template-columns: 1fr;
      }
      .step-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .header-inner {
        height: 60px;
      }
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 60px;
        left: 0;
        width: 100%;
        background: #FFF;
        flex-direction: column;
        align-items: stretch;
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 8px 16px rgba(0,0,0,0.06);
        padding: 10px 0;
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links li a {
        padding: 12px 24px;
        border-radius: 0;
      }
      .hero-title {
        font-size: 26px;
      }
      .hero-subtitle {
        font-size: 15px;
      }
      .hero-metrics {
        grid-template-columns: 1fr;
      }
      .step-timeline {
        grid-template-columns: 1fr;
      }
      .footer-inner {
        flex-direction: column;
        align-items: flex-start;
      }
    }