:root {
      --primary: #ff5500;
      --primary-hover: #e04400;
      --primary-gradient: linear-gradient(135deg, #ff6b22 0%, #ff3b00 100%);
      --accent-warm: #fff2eb;
      --accent-border: #ffd8c2;
      --bg-page: #fcfbfa;
      --bg-card: #ffffff;
      --text-main: #222222;
      --text-sub: #555555;
      --text-muted: #888888;
      --border-color: #eee4de;
      --shadow-sm: 0 4px 16px rgba(255, 85, 0, 0.06);
      --shadow-md: 0 8px 24px rgba(255, 85, 0, 0.1);
      --shadow-lg: 0 16px 36px rgba(255, 85, 0, 0.12);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --max-width: 1200px;
      --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-page);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

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

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

    .container {
      width: 100%;
      max-width: var(--max-width);
      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, 0.96);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    }

    .nav-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }

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

    .brand-logo .ai-page-logo {
      height: 40px;
      width: auto;
      object-fit: contain;
    }

    .brand-name {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
    }

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

    .nav-links a {
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-main);
      padding: 10px 14px;
      border-radius: var(--radius-sm);
      display: block;
    }

    .nav-links a:hover {
      color: var(--primary);
      background-color: var(--accent-warm);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 0.95rem;
      font-weight: 600;
      padding: 10px 22px;
      border-radius: 50px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      text-align: center;
      white-space: nowrap;
    }

    .btn-primary {
      background: var(--primary-gradient);
      color: #ffffff !important;
      box-shadow: 0 4px 15px rgba(255, 85, 0, 0.3);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(255, 85, 0, 0.4);
    }

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

    .btn-outline:hover {
      background-color: var(--accent-warm);
    }

    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
    }

    .menu-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--text-main);
      transition: var(--transition);
    }

    /* Hero 首屏 - 纯色/渐变/几何科技感，无图片 */
    .hero-section {
      background: radial-gradient(circle at 80% 20%, #ffe9dc 0%, #fff7f2 50%, #ffffff 100%);
      padding: 80px 0 70px;
      position: relative;
      overflow: hidden;
      border-bottom: 1px solid var(--border-color);
    }

    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background-color: #fff;
      border: 1px solid var(--accent-border);
      color: var(--primary);
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 0.85rem;
      font-weight: 700;
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }

    .hero-title {
      font-size: 2.5rem;
      line-height: 1.3;
      font-weight: 800;
      color: #111111;
      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: 1.15rem;
      color: var(--text-sub);
      margin-bottom: 36px;
      line-height: 1.7;
    }

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

    .btn-hero-large {
      padding: 14px 36px;
      font-size: 1.1rem;
    }

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 20px;
    }

    .stat-card {
      background: rgba(255, 255, 255, 0.9);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px 14px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .stat-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
      border-color: var(--accent-border);
    }

    .stat-card h3 {
      font-size: 1.6rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .stat-card p {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* 通用Section */
    .section {
      padding: 70px 0;
      position: relative;
    }

    .section-alt {
      background-color: #faf6f3;
    }

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

    .section-tag {
      color: var(--primary);
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1.5px;
      margin-bottom: 8px;
      display: inline-block;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: #1a1a1a;
      margin-bottom: 14px;
    }

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

    /* 卡片通用网格 */
    .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: 30px;
    }

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

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

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

    .card-title {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: #1f1f1f;
    }

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

    /* 平台介绍 */
    .intro-box {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--accent-border);
      padding: 40px;
      box-shadow: var(--shadow-md);
      margin-bottom: 40px;
    }

    .intro-grid {
      display: grid;
      grid-template-columns: 1.2fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .intro-text h3 {
      font-size: 1.6rem;
      font-weight: 800;
      margin-bottom: 16px;
      color: #111;
    }

    .intro-text p {
      font-size: 0.98rem;
      color: var(--text-sub);
      margin-bottom: 20px;
      line-height: 1.7;
    }

    .model-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 16px;
    }

    .model-pill {
      background: var(--accent-warm);
      color: var(--primary);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 600;
      border: 1px solid var(--accent-border);
    }

    /* 图像展示区 */
    .gallery-showcase {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
      margin-top: 30px;
    }

    .gallery-item {
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-color);
      background: #fff;
    }

    .gallery-item img {
      width: 100%;
      height: 240px;
      object-fit: cover;
      transition: var(--transition);
    }

    .gallery-item:hover img {
      transform: scale(1.03);
    }

    .gallery-caption {
      padding: 14px 18px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      background: #fff;
    }

    /* 评测与对比表格 */
    .evaluation-card {
      background: linear-gradient(135deg, #fff7f2 0%, #ffffff 100%);
      border: 2px solid var(--accent-border);
      border-radius: var(--radius-lg);
      padding: 36px;
      margin-bottom: 40px;
      box-shadow: var(--shadow-md);
    }

    .score-banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
      padding-bottom: 24px;
      border-bottom: 1px solid var(--accent-border);
      margin-bottom: 24px;
    }

    .score-badge {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .score-number {
      font-size: 3.5rem;
      font-weight: 900;
      color: var(--primary);
      line-height: 1;
    }

    .score-stars {
      color: #ff9900;
      font-size: 1.4rem;
      font-weight: bold;
    }

    .compare-table-wrapper {
      overflow-x: auto;
      border-radius: var(--radius-md);
      background: #fff;
      border: 1px solid var(--border-color);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 600px;
    }

    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #f0f0f0;
      font-size: 0.92rem;
    }

    .compare-table th {
      background-color: #fff4ee;
      color: #111;
      font-weight: 700;
    }

    .compare-table td.highlight {
      color: var(--primary);
      font-weight: 700;
      background-color: rgba(255, 85, 0, 0.02);
    }

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

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

    .step-num {
      width: 40px;
      height: 40px;
      background: var(--primary-gradient);
      color: #fff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      font-weight: 800;
      font-size: 1.1rem;
    }

    /* 用户评论 */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

    .review-text {
      font-size: 0.92rem;
      color: var(--text-sub);
      line-height: 1.6;
      margin-bottom: 20px;
      font-style: italic;
    }

    .reviewer-info {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f5f5f5;
      padding-top: 14px;
    }

    .reviewer-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--accent-warm);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }

    .reviewer-name {
      font-size: 0.95rem;
      font-weight: 700;
      color: #111;
    }

    .reviewer-role {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

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

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

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

    .faq-question {
      padding: 18px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      font-weight: 700;
      font-size: 1rem;
      color: #222;
      user-select: none;
    }

    .faq-icon {
      font-size: 1.2rem;
      color: var(--primary);
      transition: transform 0.3s;
    }

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

    .faq-answer-inner {
      padding: 0 24px 20px;
      font-size: 0.92rem;
      color: var(--text-sub);
      line-height: 1.7;
    }

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

    /* 表单与联系 */
    .form-box {
      background: #fff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--accent-border);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }

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

    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      margin-bottom: 6px;
      color: #333;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      font-family: inherit;
      color: var(--text-main);
      background-color: #fafafa;
      transition: var(--transition);
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      background-color: #fff;
      box-shadow: 0 0 0 3px rgba(255, 85, 0, 0.1);
    }

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

    /* 宣传物料 Banner 网格 */
    .banner-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 30px;
    }

    .banner-grid img {
      border-radius: var(--radius-sm);
      width: 100%;
      height: 160px;
      object-fit: cover;
      border: 1px solid var(--border-color);
    }

    /* 文章与资讯链接 */
    .article-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .article-item {
      background: #ffffff;
      padding: 16px 20px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: var(--transition);
    }

    .article-item:hover {
      border-color: var(--primary);
      padding-left: 24px;
    }

    .article-title {
      font-weight: 600;
      color: #222;
      font-size: 0.95rem;
    }

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

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #111;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 16px;
    }

    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links a {
      color: var(--text-sub);
      font-size: 0.9rem;
    }

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

    .qr-box {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .qr-box img {
      width: 90px;
      height: 90px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
    }

    .friend-links-area {
      border-top: 1px solid var(--border-color);
      padding-top: 24px;
      margin-top: 20px;
      font-size: 0.85rem;
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      align-items: center;
    }

    .friend-links-area span {
      font-weight: 700;
      color: #333;
    }

    .friend-links-area a {
      color: var(--text-muted);
    }

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

    .copyright-bar {
      border-top: 1px solid #f0f0f0;
      padding-top: 20px;
      margin-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* 浮动客服入口 */
    .floating-contact {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-md);
      cursor: pointer;
      font-size: 1.2rem;
      transition: var(--transition);
      border: none;
    }

    .float-btn:hover {
      transform: scale(1.1);
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .grid-4, .process-steps, .banner-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .review-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-stats {
        grid-template-columns: repeat(2, 1fr);
      }
      .intro-grid, .grid-2, .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 2rem;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .menu-toggle {
        display: flex;
      }
      .grid-3, .grid-2, .review-grid, .gallery-showcase, .banner-grid {
        grid-template-columns: 1fr;
      }
      .hero-section {
        padding: 50px 0 40px;
      }
      .hero-title {
        font-size: 1.65rem;
      }
    }