:root {
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --primary: #2563eb;
      --primary-hover: #1d4ed8;
      --accent: #f97316;
      --accent-hover: #ea580c;
      --cyan: #06b6d4;
      --purple: #8b5cf6;
      --border-color: #e2e8f0;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
      --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.08), 0 2px 4px -2px rgba(0,0,0,0.06);
      --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
      --radius: 12px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
    }
    body {
      background-color: var(--bg-main);
      color: var(--text-main);
      overflow-x: hidden;
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.2s ease;
    }
    ul {
      list-style: none;
    }
    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    .section-padding {
      padding: 70px 0;
    }
    .text-center {
      text-align: center;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
      line-height: 1.3;
    }
    .section-subtitle {
      font-size: 1rem;
      color: var(--text-muted);
      max-width: 680px;
      margin: 0 auto 40px auto;
    }
    .badge {
      display: inline-block;
      padding: 4px 12px;
      font-size: 0.85rem;
      font-weight: 600;
      border-radius: 9999px;
      margin-bottom: 12px;
      background: #e0e7ff;
      color: var(--primary);
    }
    .badge-accent {
      background: #ffedd5;
      color: var(--accent);
    }

    /* 顶部导航 */
    header.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-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo-box {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .logo-box img {
      height: 38px;
      width: auto;
      display: block;
    }
    .logo-box .brand-name {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--text-main);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }
    .nav-links a {
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-muted);
      padding: 8px 10px;
      border-radius: 6px;
    }
    .nav-links a:hover {
      color: var(--primary);
      background: #f1f5f9;
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: linear-gradient(135deg, var(--primary) 0%, #1d4ed8 100%);
      color: #ffffff;
      padding: 10px 22px;
      border-radius: 8px;
      font-weight: 600;
      font-size: 0.95rem;
      box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: linear-gradient(135deg, #1d4ed8 0%, #1e40af 100%);
      transform: translateY(-1px);
      box-shadow: 0 6px 16px rgba(37, 99, 235, 0.35);
    }
    .btn-accent {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: linear-gradient(135deg, var(--accent) 0%, #ea580c 100%);
      color: #ffffff;
      padding: 10px 22px;
      border-radius: 8px;
      font-weight: 600;
      font-size: 0.95rem;
      box-shadow: 0 4px 12px rgba(249, 115, 22, 0.25);
      border: none;
      cursor: pointer;
    }
    .btn-accent:hover {
      background: linear-gradient(135deg, #ea580c 0%, #c2410c 100%);
      transform: translateY(-1px);
      box-shadow: 0 6px 16px rgba(249, 115, 22, 0.35);
    }
    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: #ffffff;
      color: var(--text-main);
      border: 1px solid var(--border-color);
      padding: 10px 20px;
      border-radius: 8px;
      font-weight: 600;
      font-size: 0.95rem;
    }
    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: #f8fafc;
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
    }
    .menu-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--text-main);
      margin: 5px 0;
      transition: 0.3s;
    }

    /* 首屏 Hero */
    .hero-section {
      background: radial-gradient(circle at top right, #e0f2fe 0%, #f8fafc 60%, #fff7ed 100%);
      padding: 70px 0 60px 0;
      border-bottom: 1px solid var(--border-color);
      position: relative;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 40px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 2.5rem;
      font-weight: 900;
      color: #0f172a;
      line-height: 1.2;
      margin-bottom: 18px;
    }
    .hero-content h1 span.highlight {
      background: linear-gradient(120deg, #2563eb, #f97316);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-desc {
      font-size: 1.1rem;
      color: var(--text-muted);
      margin-bottom: 28px;
      line-height: 1.6;
    }
    .hero-btns {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-bottom: 30px;
    }
    .hero-highlights {
      display: flex;
      flex-wrap: wrap;
      gap: 20px;
      border-top: 1px solid var(--border-color);
      padding-top: 20px;
    }
    .hero-highlight-item {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 0.9rem;
      font-weight: 600;
      color: #334155;
    }
    .hero-highlight-item .dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #10b981;
    }
    .hero-visual-card {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      border-radius: 16px;
      padding: 24px;
      box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.03);
    }
    .visual-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 20px;
      padding-bottom: 12px;
      border-bottom: 1px solid #f1f5f9;
    }
    .visual-header .title {
      font-size: 1rem;
      font-weight: 700;
      color: #1e293b;
    }
    .visual-header .status {
      font-size: 0.78rem;
      background: #dcfce7;
      color: #15803d;
      padding: 3px 8px;
      border-radius: 4px;
      font-weight: 600;
    }
    .model-tags-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-bottom: 20px;
    }
    .model-pill {
      background: #f1f5f9;
      color: #334155;
      font-size: 0.8rem;
      font-weight: 600;
      padding: 4px 10px;
      border-radius: 6px;
      border: 1px solid #e2e8f0;
      transition: all 0.2s;
    }
    .model-pill:hover {
      background: #e0e7ff;
      color: #2563eb;
      border-color: #c7d2fe;
    }
    .feature-stat-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 12px;
    }
    .stat-item {
      background: #f8fafc;
      padding: 12px;
      border-radius: 8px;
      border: 1px solid #f1f5f9;
    }
    .stat-item .val {
      font-size: 1.25rem;
      font-weight: 800;
      color: #2563eb;
    }
    .stat-item .lbl {
      font-size: 0.78rem;
      color: #64748b;
    }

    /* 模块通用卡片 */
    .card-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 24px;
    }
    .card-grid-4 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 20px;
    }
    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
      display: flex;
      flex-direction: column;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: #93c5fd;
    }
    .card-icon {
      width: 46px;
      height: 46px;
      border-radius: 10px;
      background: #eff6ff;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      margin-bottom: 16px;
    }
    .card-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .card-desc {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.5;
      flex-grow: 1;
    }

    /* 平台介绍 */
    .platform-intro-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 16px;
      padding: 36px;
      box-shadow: var(--shadow-md);
      margin-bottom: 30px;
    }
    .intro-list {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 20px;
      margin-top: 24px;
    }
    .intro-item {
      padding: 16px;
      border-left: 4px solid var(--primary);
      background: #f8fafc;
      border-radius: 0 8px 8px 0;
    }
    .intro-item h3 {
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 6px;
      color: #1e293b;
    }
    .intro-item p {
      font-size: 0.86rem;
      color: var(--text-muted);
    }

    /* 流程步骤 */
    .steps-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
      position: relative;
    }
    .step-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      position: relative;
    }
    .step-num {
      width: 32px;
      height: 32px;
      border-radius: 50%;
      background: var(--accent);
      color: #ffffff;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 14px;
      font-size: 0.9rem;
    }

    /* 对比表格 */
    .table-responsive {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    table.compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }
    table.compare-table th,
    table.compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.9rem;
    }
    table.compare-table th {
      background: #f1f5f9;
      color: #1e293b;
      font-weight: 700;
    }
    table.compare-table tr:hover {
      background: #f8fafc;
    }
    .highlight-col {
      background: #eff6ff;
      font-weight: 700;
      color: var(--primary);
    }
    .rating-banner {
      background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
      color: #ffffff;
      border-radius: 12px;
      padding: 20px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 24px;
    }
    .rating-score {
      font-size: 1.8rem;
      font-weight: 900;
      color: #fbbf24;
    }

    /* 案例与素材图展示 */
    .media-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }
    .media-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .media-card .img-wrap {
      width: 100%;
      overflow: hidden;
      background: #e2e8f0;
    }
    .media-card .img-wrap img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.3s ease;
    }
    .media-card:hover .img-wrap img {
      transform: scale(1.02);
    }
    .media-body {
      padding: 20px;
    }

    /* 用户评论 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 20px;
    }
    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 22px;
      box-shadow: var(--shadow-sm);
    }
    .reviewer-info {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 12px;
    }
    .reviewer-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #e2e8f0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary);
    }
    .reviewer-meta h4 {
      font-size: 0.95rem;
      font-weight: 700;
      color: #1e293b;
    }
    .reviewer-meta p {
      font-size: 0.8rem;
      color: #64748b;
    }
    .review-text {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* FAQ 折叠 */
    .faq-accordion {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 20px;
      font-size: 1rem;
      font-weight: 700;
      color: #1e293b;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    .faq-question:hover {
      background: #f8fafc;
    }
    .faq-icon {
      font-size: 1.1rem;
      font-weight: 400;
      transition: transform 0.2s;
    }
    .faq-answer {
      display: none;
      padding: 0 20px 18px 20px;
      font-size: 0.9rem;
      color: var(--text-muted);
      border-top: 1px solid #f1f5f9;
      line-height: 1.6;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 表单与联系区 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 40px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 16px;
      padding: 40px;
      box-shadow: var(--shadow-md);
    }
    .contact-info-col h3 {
      font-size: 1.4rem;
      font-weight: 800;
      margin-bottom: 16px;
    }
    .contact-info-col p {
      font-size: 0.92rem;
      color: var(--text-muted);
      margin-bottom: 24px;
    }
    .contact-item {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
      font-size: 0.92rem;
    }
    .contact-item strong {
      color: #1e293b;
      min-width: 80px;
    }
    .qr-box {
      margin-top: 20px;
      padding: 16px;
      background: #f8fafc;
      border: 1px solid var(--border-color);
      border-radius: 10px;
      display: inline-block;
      text-align: center;
    }
    .qr-box img {
      width: 130px;
      height: 130px;
      object-fit: contain;
      display: block;
      margin: 0 auto 8px auto;
    }
    .qr-box span {
      font-size: 0.8rem;
      color: var(--text-muted);
    }
    .form-group {
      margin-bottom: 16px;
    }
    .form-group label {
      display: block;
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 6px;
      color: #334155;
    }
    .form-control {
      width: 100%;
      padding: 10px 14px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 0.92rem;
      background: #f8fafc;
      transition: border-color 0.2s;
    }
    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      background: #ffffff;
    }
    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    /* 文章列表与外链区 */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 16px;
    }
    .article-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 16px;
      border-radius: 8px;
      transition: all 0.2s;
    }
    .article-item:hover {
      border-color: var(--primary);
      background: #eff6ff;
    }
    .article-item a {
      font-size: 0.9rem;
      font-weight: 600;
      color: #1e293b;
      display: block;
    }

    /* 页脚 */
    footer.site-footer {
      background: #0f172a;
      color: #cbd5e1;
      padding: 60px 0 30px 0;
      border-top: 1px solid #1e293b;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      font-size: 1.1rem;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 16px;
    }
    .footer-col p {
      font-size: 0.88rem;
      line-height: 1.6;
      color: #94a3b8;
    }
    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }
    .friend-links a {
      font-size: 0.85rem;
      color: #94a3b8;
      background: #1e293b;
      padding: 4px 10px;
      border-radius: 4px;
    }
    .friend-links a:hover {
      color: #38bdf8;
      background: #334155;
    }
    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      text-align: center;
      font-size: 0.82rem;
      color: #64748b;
    }

    /* 悬浮工具 */
    .float-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #ffffff;
      color: var(--text-main);
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      font-weight: 700;
      font-size: 1.1rem;
    }
    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .hero-grid,
      .contact-wrapper,
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .nav-links {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      .nav-links.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        border-bottom: 1px solid var(--border-color);
        padding: 20px;
        gap: 8px;
        box-shadow: var(--shadow-md);
      }
      .nav-links.active a {
        width: 100%;
      }
    }