:root {
      --primary: #7928ca;
      --primary-dark: #581c87;
      --primary-light: #9333ea;
      --accent: #d946ef;
      --accent-glow: rgba(217, 70, 239, 0.15);
      --bg-base: #fbf9fe;
      --bg-surface: #ffffff;
      --bg-subtle: #f5f0fb;
      --text-main: #1e1b4b;
      --text-muted: #4c4765;
      --text-sub: #6b6487;
      --border-color: #ebdff7;
      --border-focus: #c084fc;
      --shadow-sm: 0 2px 8px rgba(121, 40, 202, 0.05);
      --shadow-md: 0 8px 24px rgba(121, 40, 202, 0.08);
      --shadow-lg: 0 16px 36px rgba(121, 40, 202, 0.12);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --container-max: 1200px;
      --transition: all 0.28s ease;
    }

    * {
      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-base);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
      background-image: 
        radial-gradient(circle at 10% 0%, rgba(217, 70, 239, 0.06) 0%, transparent 40%),
        radial-gradient(circle at 90% 20%, rgba(121, 40, 202, 0.05) 0%, transparent 45%),
        radial-gradient(circle at 50% 80%, rgba(147, 51, 234, 0.04) 0%, transparent 50%);
      background-attachment: fixed;
    }

    .container {
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      transition: var(--transition);
    }

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

    .logo-area {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }

    .logo-area img {
      height: 38px;
      width: auto;
      display: block;
    }

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

    .nav-links li a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.95rem;
      font-weight: 500;
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      transition: var(--transition);
      display: inline-block;
    }

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

    .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: 600;
      border-radius: 999px;
      text-decoration: none;
      transition: var(--transition);
      cursor: pointer;
      border: 1px solid transparent;
      line-height: 1.2;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(121, 40, 202, 0.3);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(121, 40, 202, 0.45);
      color: #ffffff;
    }

    .btn-outline {
      background: var(--bg-surface);
      border-color: var(--border-focus);
      color: var(--primary);
    }

    .btn-outline:hover {
      background: var(--bg-subtle);
      border-color: var(--primary);
      transform: translateY(-2px);
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 6px;
    }

    /* 首屏 Hero */
    .hero-section {
      padding: 90px 0 60px;
      text-align: center;
      position: relative;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: var(--bg-subtle);
      border: 1px solid var(--border-color);
      padding: 6px 16px;
      border-radius: 999px;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 24px;
    }

    .hero-badge span {
      display: inline-block;
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--accent);
      box-shadow: 0 0 8px var(--accent);
    }

    .hero-title {
      font-size: 2.85rem;
      font-weight: 800;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title .gradient-text {
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 36px;
    }

    .hero-btns {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      margin-bottom: 48px;
      flex-wrap: wrap;
    }

    .btn-hero-portal {
      font-size: 1.05rem;
      padding: 14px 34px;
    }

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 960px;
      margin: 0 auto;
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: var(--shadow-md);
    }

    .stat-item {
      text-align: center;
      border-right: 1px solid var(--border-color);
    }

    .stat-item:last-child {
      border-right: none;
    }

    .stat-value {
      font-size: 1.85rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 0.88rem;
      color: var(--text-sub);
    }

    /* 通用板块样式 */
    .section-padding {
      padding: 72px 0;
    }

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

    .section-tag {
      display: inline-block;
      font-size: 0.82rem;
      font-weight: 700;
      color: var(--primary);
      text-transform: uppercase;
      letter-spacing: 1px;
      background: var(--bg-subtle);
      border: 1px solid var(--border-color);
      padding: 4px 12px;
      border-radius: 999px;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 14px;
    }

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

    /* 卡片网格 */
    .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: 32px;
      align-items: center;
    }

    .feature-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      transition: var(--transition);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      height: 100%;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: var(--border-focus);
    }

    .feature-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: var(--bg-subtle);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 18px;
      color: var(--primary);
      font-size: 1.4rem;
    }

    .feature-title {
      font-size: 1.18rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .feature-desc {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 模型矩阵徽章云 */
    .model-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }

    .model-badge {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      color: var(--text-main);
      padding: 8px 16px;
      border-radius: 999px;
      font-size: 0.88rem;
      font-weight: 500;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .model-badge:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-2px);
    }

    /* 流程与步骤 */
    .step-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

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

    .step-num {
      font-size: 1.8rem;
      font-weight: 900;
      color: var(--accent);
      opacity: 0.8;
      margin-bottom: 8px;
    }

    /* 对比表格 */
    .compare-container {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-md);
      overflow-x: auto;
    }

    .rating-banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: linear-gradient(135deg, rgba(121, 40, 202, 0.08) 0%, rgba(217, 70, 239, 0.08) 100%);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px 28px;
      margin-bottom: 28px;
    }

    .rating-score {
      display: flex;
      align-items: baseline;
      gap: 8px;
    }

    .rating-score .val {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--primary);
    }

    .rating-score .stars {
      color: #f59e0b;
      font-size: 1.2rem;
    }

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

    .compare-table th, 
    .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }

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

    .compare-table td.highlight {
      color: var(--primary);
      font-weight: 700;
      background: rgba(121, 40, 202, 0.02);
    }

    /* 案例展示 */
    .case-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
    }

    .case-img-wrap {
      width: 100%;
      background: var(--bg-subtle);
      overflow: hidden;
    }

    .case-img-wrap img {
      width: 100%;
      height: auto;
      display: block;
      transition: var(--transition);
    }

    .case-card:hover .case-img-wrap img {
      transform: scale(1.03);
    }

    .case-body {
      padding: 20px;
    }

    .case-tag {
      font-size: 0.8rem;
      color: var(--primary);
      font-weight: 600;
      margin-bottom: 6px;
    }

    .case-title {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

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

    /* 用户评论 */
    .review-card {
      background: var(--bg-surface);
      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;
    }

    .review-content {
      font-size: 0.94rem;
      color: var(--text-muted);
      margin-bottom: 16px;
      line-height: 1.6;
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-color);
      padding-top: 14px;
    }

    .review-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.9rem;
    }

    .review-info h4 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .review-info p {
      font-size: 0.82rem;
      color: var(--text-sub);
    }

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

    .faq-item {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-question {
      padding: 18px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      font-weight: 700;
      color: var(--text-main);
      font-size: 1.02rem;
      user-select: none;
    }

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

    .faq-toggle-icon {
      font-size: 1.2rem;
      color: var(--primary);
      transition: transform 0.28s ease;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: var(--bg-subtle);
      color: var(--text-muted);
      font-size: 0.94rem;
      line-height: 1.65;
      padding: 0 24px;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 16px 24px 20px;
    }

    /* 表单与联系 */
    .contact-wrap {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }

    .contact-form {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .form-group label {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      color: var(--text-main);
      background: var(--bg-base);
      outline: none;
      transition: var(--transition);
      font-family: inherit;
    }

    .form-control:focus {
      border-color: var(--primary);
      background: #ffffff;
      box-shadow: 0 0 0 3px var(--accent-glow);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    .contact-details {
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .contact-card-info {
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin-bottom: 24px;
    }

    .contact-item-row {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 0.95rem;
      color: var(--text-muted);
    }

    .contact-qr-block {
      display: flex;
      align-items: center;
      gap: 20px;
      background: var(--bg-subtle);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 16px;
    }

    .contact-qr-block img {
      width: 100px;
      height: 100px;
      border-radius: var(--radius-sm);
      background: #ffffff;
      padding: 4px;
      border: 1px solid var(--border-color);
    }

    /* 文章列表 */
    .article-card-group {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .article-item {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .article-item:hover {
      transform: translateY(-3px);
      border-color: var(--border-focus);
      box-shadow: var(--shadow-md);
    }

    .article-item a {
      text-decoration: none;
      color: var(--text-main);
      font-weight: 700;
      font-size: 1rem;
      margin-bottom: 8px;
      display: inline-block;
    }

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

    .article-meta {
      font-size: 0.82rem;
      color: var(--text-sub);
    }

    /* 页脚 */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 48px 0 24px;
      margin-top: 60px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 36px;
      margin-bottom: 36px;
    }

    .footer-col h4 {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
    }

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

    .footer-links a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.9rem;
      transition: var(--transition);
    }

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

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

    .friend-links a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.88rem;
      background: var(--bg-subtle);
      border: 1px solid var(--border-color);
      padding: 4px 10px;
      border-radius: var(--radius-sm);
      transition: var(--transition);
    }

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

    .footer-bottom {
      border-top: 1px solid var(--border-color);
      padding-top: 20px;
      text-align: center;
      font-size: 0.85rem;
      color: var(--text-sub);
    }

    /* 浮动侧边栏与返回顶部 */
    .float-panel {
      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: var(--bg-surface);
      border: 1px solid var(--border-color);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-md);
      cursor: pointer;
      text-decoration: none;
      transition: var(--transition);
      font-size: 1.1rem;
    }

    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: scale(1.05);
    }

    /* 响应式媒体查询 */
    @media (max-width: 992px) {
      .grid-4, .step-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .article-card-group {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .contact-wrap {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 2.3rem;
      }
    }

    @media (max-width: 768px) {
      .mobile-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 16px 24px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        display: block;
        padding: 10px 0;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .hero-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
      }
      .stat-item:nth-child(2) {
        border-right: none;
      }
      .grid-4, .grid-3, .grid-2, .step-grid, .article-card-group {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .rating-banner {
        flex-direction: column;
        text-align: center;
        gap: 12px;
      }
    }