:root {
      --primary: #FF5722;
      --primary-hover: #F4511E;
      --primary-dark: #E64A19;
      --primary-light: #FFF3E0;
      --secondary: #FF9800;
      --accent: #FF3D00;
      --text-main: #1E293B;
      --text-muted: #64748B;
      --bg-body: #FAFAFB;
      --bg-card: #FFFFFF;
      --border-color: #FFE0B2;
      --border-light: #F1F5F9;
      --container-max: 1200px;
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
      --shadow-md: 0 8px 24px -4px rgba(255, 87, 34, 0.08);
      --shadow-lg: 0 16px 36px -6px rgba(255, 87, 34, 0.14);
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-body);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      background: radial-gradient(circle at 10% 0%, rgba(255, 87, 34, 0.03) 0%, transparent 40%),
                  radial-gradient(circle at 90% 100%, rgba(255, 152, 0, 0.03) 0%, transparent 40%),
                  var(--bg-body);
      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.25s ease;
    }

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

    .container {
      max-width: var(--container-max);
      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, 0.96);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-box img {
      max-height: 44px;
      width: auto;
    }
    .brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--primary-dark);
      letter-spacing: 0.5px;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      list-style: none;
    }
    .nav-menu a {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
      padding: 6px 10px;
      border-radius: var(--radius-sm);
    }
    .nav-menu a:hover {
      color: var(--primary);
      background-color: 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;
      font-size: 0.95rem;
      font-weight: 700;
      border-radius: 8px;
      cursor: pointer;
      border: none;
      transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
      text-align: center;
    }
    .btn:active {
      transform: scale(0.98);
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      color: #FFFFFF;
      box-shadow: 0 4px 14px rgba(255, 87, 34, 0.35);
    }
    .btn-primary:hover {
      background: linear-gradient(135deg, var(--primary-hover) 0%, var(--primary) 100%);
      box-shadow: 0 6px 20px rgba(255, 87, 34, 0.45);
      color: #FFFFFF;
    }
    .btn-secondary {
      background: var(--primary-light);
      color: var(--primary-dark);
      border: 1px solid var(--border-color);
    }
    .btn-secondary:hover {
      background: #FFE0B2;
      color: var(--primary-dark);
    }
    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary);
      color: var(--primary);
    }
    .btn-outline:hover {
      background: var(--primary);
      color: #FFFFFF;
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
    }

    /* 模块通用样式 */
    .section-padding {
      padding: 80px 0;
    }
    .section-head {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 50px auto;
    }
    .section-badge {
      display: inline-block;
      padding: 4px 14px;
      background-color: var(--primary-light);
      color: var(--primary-dark);
      border: 1px solid var(--border-color);
      border-radius: 50px;
      font-size: 0.85rem;
      font-weight: 700;
      margin-bottom: 12px;
      text-transform: uppercase;
    }
    .section-title {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 16px;
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
    }

    /* 首屏 Hero 区域 (绝对无图片) */
    .hero-section {
      padding: 90px 0 70px 0;
      background: linear-gradient(180deg, #FFFFFF 0%, #FFF8F5 100%);
      border-bottom: 1px solid var(--border-color);
      position: relative;
    }
    .hero-wrapper {
      text-align: center;
      max-width: 960px;
      margin: 0 auto;
    }
    .hero-h1 {
      font-size: 2.5rem;
      font-weight: 900;
      line-height: 1.25;
      color: #0F172A;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-h1 span {
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-subtitle {
      font-size: 1.2rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 36px;
    }
    .hero-cta-group {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 18px;
      margin-bottom: 45px;
      flex-wrap: wrap;
    }
    .btn-hero {
      padding: 15px 36px;
      font-size: 1.15rem;
      border-radius: 10px;
    }
    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 40px;
    }
    .stat-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      padding: 20px 15px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: transform 0.3s ease;
    }
    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .stat-number {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary-dark);
      margin-bottom: 4px;
    }
    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* 模型滚动标签 */
    .hero-models-box {
      margin-top: 45px;
      padding: 20px;
      background: #FFFFFF;
      border: 1px dashed var(--border-color);
      border-radius: var(--radius-md);
    }
    .models-label {
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--text-muted);
      margin-bottom: 12px;
      display: block;
    }
    .model-tags {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 8px;
    }
    .model-tag {
      background: #FFF3E0;
      color: #C2410C;
      font-size: 0.82rem;
      font-weight: 600;
      padding: 5px 12px;
      border-radius: 6px;
      border: 1px solid #FFE0B2;
    }

    /* 卡片与网格通用 */
    .grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
    .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
    .grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

    .card {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 30px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      position: relative;
    }
    .card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: var(--border-color);
    }
    .card-icon {
      width: 54px;
      height: 54px;
      border-radius: 12px;
      background: var(--primary-light);
      color: var(--primary-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.6rem;
      margin-bottom: 20px;
    }
    .card-title {
      font-size: 1.3rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }
    .card-text {
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.6;
    }

    /* 关于我们 & 平台介绍 */
    .about-box {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }
    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .about-highlights {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      margin-top: 24px;
    }
    .highlight-item {
      padding: 16px;
      background: #FFF8F5;
      border-radius: var(--radius-sm);
      border-left: 4px solid var(--primary);
    }
    .highlight-item h4 {
      font-size: 1.05rem;
      color: var(--text-main);
      margin-bottom: 4px;
    }
    .highlight-item p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 对比评测模块 */
    .eval-highlight-bar {
      background: linear-gradient(135deg, #FFF3E0 0%, #FFE0B2 100%);
      border: 2px solid var(--primary);
      border-radius: var(--radius-md);
      padding: 24px 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 30px;
      flex-wrap: wrap;
      gap: 20px;
    }
    .eval-score-box {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .eval-stars {
      color: #FF9800;
      font-size: 1.8rem;
      letter-spacing: 2px;
    }
    .eval-score-num {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--primary-dark);
    }
    .eval-score-max {
      font-size: 1.1rem;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* 表格样式 */
    .table-responsive {
      width: 100%;
      overflow-x: auto;
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .custom-table th, .custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-light);
    }
    .custom-table th {
      background: #FFF8F5;
      color: var(--primary-dark);
      font-weight: 700;
      font-size: 1rem;
    }
    .custom-table tr:hover td {
      background: #FFFAF8;
    }
    .badge-win {
      background: #E8F5E9;
      color: #2E7D32;
      padding: 4px 10px;
      border-radius: 4px;
      font-size: 0.85rem;
      font-weight: 700;
    }

    /* 流程步骤 */
    .process-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .step-card {
      background: #FFFFFF;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 24px;
      text-align: center;
      position: relative;
    }
    .step-num {
      width: 40px;
      height: 40px;
      line-height: 40px;
      border-radius: 50%;
      background: var(--primary);
      color: #FFFFFF;
      font-weight: 800;
      margin: 0 auto 16px auto;
      font-size: 1.1rem;
      box-shadow: 0 4px 10px rgba(255, 87, 34, 0.3);
    }

    /* 用户评论 */
    .review-card {
      background: #FFFFFF;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-text {
      font-size: 0.95rem;
      color: var(--text-main);
      line-height: 1.6;
      margin-bottom: 16px;
      font-style: italic;
    }
    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-light);
      padding-top: 12px;
    }
    .author-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary-light) 0%, #FFE0B2 100%);
      color: var(--primary-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
    }
    .author-info h5 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
    }
    .author-info p {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    /* FAQ 手风琴 */
    .faq-container {
      max-width: 900px;
      margin: 0 auto;
    }
    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .faq-question {
      padding: 18px 24px;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #FFFFFF;
      user-select: none;
      transition: background-color 0.2s ease;
    }
    .faq-question:hover {
      background-color: #FFF8F5;
      color: var(--primary-dark);
    }
    .faq-icon {
      font-size: 1.2rem;
      color: var(--primary);
      transition: transform 0.3s ease;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      background-color: #FFFCFA;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.6;
      padding: 0 24px;
    }
    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 16px 24px 20px 24px;
      border-top: 1px solid var(--border-light);
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 表单与需求匹配 */
    .form-box {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-label {
      display: block;
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1.5px solid #CBD5E1;
      border-radius: 8px;
      font-size: 0.95rem;
      color: var(--text-main);
      background-color: #F8FAFC;
      transition: border-color 0.2s ease, box-shadow 0.2s ease;
    }
    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      background-color: #FFFFFF;
      box-shadow: 0 0 0 3px rgba(255, 87, 34, 0.15);
    }
    textarea.form-control {
      min-height: 110px;
      resize: vertical;
    }

    /* 知识库与文章 */
    .article-links-box {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      margin-top: 24px;
    }
    .article-list {
      list-style: none;
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 12px;
    }
    .article-list li a {
      color: var(--text-main);
      font-size: 0.92rem;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .article-list li a:hover {
      color: var(--primary);
      text-decoration: underline;
    }

    /* 联系与页脚 */
    .contact-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px;
      text-align: center;
    }
    .contact-qr-img {
      width: 160px;
      height: 160px;
      margin: 16px auto;
      border: 1px solid var(--border-light);
      padding: 6px;
      border-radius: var(--radius-sm);
      background: #FFFFFF;
    }

    .site-footer {
      background: #111827;
      color: #E2E8F0;
      padding: 60px 0 30px 0;
      border-top: 4px solid var(--primary);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 30px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      color: #FFFFFF;
      font-size: 1.1rem;
      margin-bottom: 20px;
      position: relative;
      padding-bottom: 8px;
    }
    .footer-col h4::after {
      content: "";
      position: absolute;
      left: 0;
      bottom: 0;
      width: 30px;
      height: 2px;
      background: var(--primary);
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a {
      color: #94A3B8;
      font-size: 0.9rem;
    }
    .footer-links a:hover {
      color: var(--secondary);
    }
    .friendship-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 20px;
      padding-top: 20px;
      border-top: 1px solid #1F2937;
    }
    .friendship-links a {
      color: #94A3B8;
      font-size: 0.85rem;
      background: #1F2937;
      padding: 4px 10px;
      border-radius: 4px;
    }
    .friendship-links a:hover {
      color: #FFFFFF;
      background: var(--primary);
    }
    .copyright-bar {
      text-align: center;
      padding-top: 30px;
      border-top: 1px solid #1F2937;
      color: #64748B;
      font-size: 0.85rem;
    }

    /* 悬浮客服与返回顶部 */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      color: #FFFFFF;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 16px rgba(255, 87, 34, 0.4);
      cursor: pointer;
      font-size: 1.2rem;
      border: none;
      transition: transform 0.2s ease;
    }
    .float-btn:hover {
      transform: scale(1.08);
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .hero-stats { grid-template-columns: repeat(2, 1fr); }
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .about-grid { grid-template-columns: 1fr; }
      .process-steps { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .nav-menu { display: none; }
      .mobile-toggle { display: block; }
    }
    @media (max-width: 640px) {
      .hero-h1 { font-size: 1.8rem; }
      .section-title { font-size: 1.6rem; }
      .grid-2, .grid-3, .grid-4, .process-steps, .article-list { grid-template-columns: 1fr; }
      .hero-stats { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .about-highlights { grid-template-columns: 1fr; }
      .eval-highlight-bar { flex-direction: column; text-align: center; }
    }