:root {
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --primary: #2563eb;
      --accent-orange: #ff5400;
      --accent-cyan: #06b6d4;
      --accent-purple: #8b5cf6;
      --accent-yellow: #facc15;
      --border-color: #e2e8f0;
      --radius: 12px;
      --shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.06), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
      --shadow-hover: 0 20px 30px -10px rgba(37, 99, 235, 0.12), 0 10px 15px -5px rgba(255, 84, 0, 0.08);
      --max-width: 1200px;
    }

    * {
      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-main);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
      display: flex;
      flex-direction: column;
      min-height: 100vh;
    }

    .container {
      width: 100%;
      max-width: var(--max-width);
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 2px solid #ff5400;
      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-area {
      display: flex;
      align-items: center;
      gap: 12px;
    }

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

    .brand-name {
      font-size: 1.25rem;
      font-weight: 800;
      color: #0f172a;
      letter-spacing: -0.5px;
    }

    .brand-badge {
      background: #ff5400;
      color: #fff;
      font-size: 0.75rem;
      padding: 2px 8px;
      border-radius: 20px;
      font-weight: 700;
    }

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

    .nav-links li a {
      padding: 8px 14px;
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
      border-radius: 6px;
      display: inline-block;
    }

    .nav-links li a:hover {
      color: var(--accent-orange);
      background: rgba(255, 84, 0, 0.06);
    }

    .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: 2px solid transparent;
      transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
      text-align: center;
    }

    .btn-contrast {
      background: #ff5400;
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(255, 84, 0, 0.35);
    }

    .btn-contrast:hover {
      background: #e04a00;
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(255, 84, 0, 0.45);
    }

    .btn-outline {
      border-color: #2563eb;
      color: #2563eb !important;
      background: transparent;
    }

    .btn-outline:hover {
      background: #2563eb;
      color: #ffffff !important;
      transform: translateY(-2px);
    }

    .btn-cyan {
      background: #06b6d4;
      color: #0f172a !important;
      font-weight: 800;
    }

    .btn-cyan:hover {
      background: #0891b2;
      color: #fff !important;
      transform: translateY(-2px);
    }

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

    /* 首屏 Hero */
    .hero-section {
      background: linear-gradient(135deg, #eff6ff 0%, #fff7ed 50%, #f5f3ff 100%);
      padding: 70px 0 60px;
      border-bottom: 1px solid var(--border-color);
      position: relative;
    }

    .hero-wrapper {
      text-align: center;
      max-width: 960px;
      margin: 0 auto;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #0f172a;
      color: #facc15;
      padding: 6px 16px;
      border-radius: 50px;
      font-size: 0.85rem;
      font-weight: 700;
      margin-bottom: 20px;
      border: 1px solid #334155;
    }

    .hero-title {
      font-size: clamp(1.8rem, 4vw, 2.75rem);
      font-weight: 900;
      line-height: 1.25;
      color: #0f172a;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title span.highlight-orange {
      color: #ff5400;
      background: rgba(255, 84, 0, 0.08);
      padding: 0 6px;
      border-radius: 6px;
    }

    .hero-title span.highlight-blue {
      color: #2563eb;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 780px;
      margin: 0 auto 35px;
    }

    .hero-cta-group {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 16px;
      margin-bottom: 45px;
    }

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

    .stat-card {
      background: #ffffff;
      border-radius: var(--radius);
      padding: 18px 12px;
      border: 2px solid var(--border-color);
      box-shadow: var(--shadow);
      transition: transform 0.25s ease;
    }

    .stat-card:hover {
      transform: translateY(-4px);
      border-color: #2563eb;
    }

    .stat-card.accent {
      border-top: 4px solid #ff5400;
    }

    .stat-card.accent-2 {
      border-top: 4px solid #06b6d4;
    }

    .stat-card.accent-3 {
      border-top: 4px solid #8b5cf6;
    }

    .stat-card.accent-4 {
      border-top: 4px solid #2563eb;
    }

    .stat-num {
      font-size: 1.6rem;
      font-weight: 900;
      color: #0f172a;
      display: block;
    }

    .stat-label {
      font-size: 0.85rem;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* 模块通用样式 */
    .section-padding {
      padding: 70px 0;
      border-bottom: 1px solid var(--border-color);
    }

    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 45px;
    }

    .section-tag {
      font-size: 0.85rem;
      font-weight: 800;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: #ff5400;
      background: rgba(255, 84, 0, 0.1);
      padding: 4px 14px;
      border-radius: 4px;
      display: inline-block;
      margin-bottom: 10px;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: #0f172a;
      margin-bottom: 12px;
    }

    .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: 28px;
    }

    .card {
      background: var(--bg-card);
      border-radius: var(--radius);
      padding: 24px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }

    .card-badge {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 700;
      padding: 3px 10px;
      border-radius: 4px;
      margin-bottom: 12px;
      align-self: flex-start;
    }

    .badge-orange { background: #fff0eb; color: #ff5400; }
    .badge-blue { background: #eff6ff; color: #2563eb; }
    .badge-cyan { background: #ecfeff; color: #0891b2; }
    .badge-purple { background: #f5f3ff; color: #7c3aed; }
    .badge-green { background: #f0fdf4; color: #16a34a; }

    .card-title {
      font-size: 1.2rem;
      font-weight: 700;
      color: #0f172a;
      margin-bottom: 8px;
    }

    .card-desc {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.55;
      margin-bottom: 14px;
    }

    /* 媒体展示容器 */
    .media-card-img {
      width: 100%;
      border-radius: 8px;
      overflow: hidden;
      margin-bottom: 16px;
      background: #e2e8f0;
      border: 1px solid var(--border-color);
    }

    .media-card-img img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.3s ease;
    }

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

    /* 标签云与模型池 */
    .model-tags-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 20px;
    }

    .model-tag {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      color: #1e293b;
      padding: 6px 14px;
      border-radius: 6px;
      font-size: 0.88rem;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      box-shadow: 0 2px 4px rgba(0,0,0,0.02);
    }

    .model-tag::before {
      content: "";
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background: #ff5400;
    }

    /* 评测与对比表格 */
    .rating-box {
      background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
      color: #ffffff;
      border-radius: var(--radius);
      padding: 30px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      margin-bottom: 30px;
    }

    .rating-score {
      display: flex;
      align-items: baseline;
      gap: 10px;
    }

    .score-number {
      font-size: 3.5rem;
      font-weight: 900;
      color: #facc15;
      line-height: 1;
    }

    .score-stars {
      color: #facc15;
      font-size: 1.5rem;
      letter-spacing: 2px;
    }

    .table-container {
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow);
    }

    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }

    .custom-table th {
      background: #f1f5f9;
      color: #0f172a;
      font-weight: 700;
      padding: 16px 20px;
      border-bottom: 2px solid var(--border-color);
    }

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

    .custom-table tr:hover {
      background: #f8fafc;
    }

    .table-highlight {
      font-weight: 700;
      color: #ff5400;
    }

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

    .step-item {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius);
      border: 2px solid var(--border-color);
      position: relative;
    }

    .step-num {
      width: 36px;
      height: 36px;
      background: #ff5400;
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      margin-bottom: 14px;
    }

    /* FAQ 手风琴 */
    .faq-wrapper {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      background: #ffffff;
      border-radius: 8px;
      border: 1px solid var(--border-color);
      overflow: hidden;
      transition: border-color 0.2s ease;
    }

    .faq-item.active {
      border-color: #2563eb;
    }

    .faq-question {
      padding: 18px 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 700;
      color: #0f172a;
      background: #ffffff;
      user-select: none;
    }

    .faq-question:hover {
      background: #f8fafc;
      color: #2563eb;
    }

    .faq-toggle {
      font-size: 1.2rem;
      font-weight: 800;
      color: #64748b;
      transition: transform 0.3s ease;
    }

    .faq-item.active .faq-toggle {
      transform: rotate(45deg);
      color: #2563eb;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s cubic-bezier(0.16, 1, 0.3, 1), padding 0.3s ease;
      background: #f8fafc;
      font-size: 0.95rem;
      color: var(--text-muted);
      padding: 0 20px;
    }

    .faq-item.active .faq-answer {
      padding: 16px 20px;
      max-height: 200px;
      border-top: 1px solid var(--border-color);
    }

    /* 用户评论 */
    .testimonial-card {
      background: #ffffff;
      border-radius: var(--radius);
      padding: 24px;
      border-left: 5px solid #ff5400;
      box-shadow: var(--shadow);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .test-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 16px;
    }

    .user-avatar-tag {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #eff6ff;
      color: #2563eb;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.1rem;
      border: 1px solid #bfdbfe;
    }

    .user-meta h4 {
      font-size: 0.95rem;
      color: #0f172a;
    }

    .user-meta p {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* 表单与联系区 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      align-items: stretch;
    }

    .form-wrapper {
      background: #ffffff;
      border-radius: var(--radius);
      padding: 32px;
      border: 2px solid var(--border-color);
      box-shadow: var(--shadow);
    }

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

    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 700;
      color: #0f172a;
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border-radius: 6px;
      border: 1px solid #cbd5e1;
      font-size: 0.95rem;
      color: #0f172a;
      outline: none;
      transition: border-color 0.2s ease;
      background: #fff;
    }

    .form-control:focus {
      border-color: #2563eb;
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
    }

    .contact-info-panel {
      background: linear-gradient(145deg, #1e293b, #0f172a);
      color: #ffffff;
      border-radius: var(--radius);
      padding: 32px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .contact-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 14px;
      margin: 20px 0;
    }

    .contact-list li {
      font-size: 0.95rem;
      color: #cbd5e1;
    }

    .contact-list strong {
      color: #facc15;
    }

    .qr-box {
      background: #ffffff;
      color: #0f172a;
      border-radius: 8px;
      padding: 16px;
      display: inline-flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
      width: fit-content;
    }

    .qr-box img {
      width: 130px;
      height: 130px;
      object-fit: cover;
      display: block;
      border-radius: 4px;
    }

    /* 资讯与友情链接 */
    .article-links, .friendly-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 14px;
    }

    .article-link-item, .friendly-link-item a {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 6px;
      font-size: 0.88rem;
      color: #1e293b;
      display: inline-block;
    }

    .article-link-item:hover, .friendly-link-item a:hover {
      color: #ff5400;
      border-color: #ff5400;
      background: #fff7ed;
    }

    /* 页脚 */
    .site-footer {
      background: #0f172a;
      color: #cbd5e1;
      padding: 45px 0 25px;
      margin-top: auto;
      border-top: 4px solid #ff5400;
    }

    .footer-content {
      display: flex;
      flex-direction: column;
      gap: 20px;
      text-align: center;
      align-items: center;
    }

    .footer-links {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 16px;
    }

    .footer-links a {
      color: #94a3b8;
      font-size: 0.9rem;
    }

    .footer-links a:hover {
      color: #facc15;
    }

    .footer-copy {
      font-size: 0.85rem;
      color: #64748b;
      border-top: 1px solid #1e293b;
      padding-top: 18px;
      width: 100%;
    }

    /* 悬浮客服挂件 */
    .floating-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      background: #ff5400;
      color: #ffffff;
      border-radius: 50px;
      padding: 12px 20px;
      display: flex;
      align-items: center;
      gap: 8px;
      box-shadow: 0 8px 20px rgba(255, 84, 0, 0.4);
      font-weight: 700;
      font-size: 0.9rem;
      cursor: pointer;
      transition: transform 0.25s ease;
    }

    .floating-kefu:hover {
      transform: scale(1.05);
      background: #e04a00;
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .grid-4, .timeline-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-grid {
        grid-template-columns: 1fr;
      }
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 2px solid #ff5400;
        box-shadow: 0 10px 15px rgba(0,0,0,0.1);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links li {
        width: 100%;
        text-align: center;
      }
      .nav-links li a {
        padding: 12px;
        width: 100%;
      }
      .grid-3, .grid-2 {
        grid-template-columns: 1fr;
      }
      .hero-stats-grid {
        grid-template-columns: 1fr 1fr;
      }
      .section-title {
        font-size: 1.6rem;
      }
      .rating-box {
        flex-direction: column;
        text-align: center;
      }
    }