:root {
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --line-color: #e2e8f0;
      --holo-gradient: linear-gradient(135deg, #ff76ac 0%, #9969ff 35%, #00d2ff 70%, #05ffa1 100%);
      --holo-border: linear-gradient(120deg, rgba(255,118,172,0.6), rgba(153,105,255,0.6), rgba(0,210,255,0.6));
      --card-shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.05), 0 8px 10px -6px rgba(15, 23, 42, 0.03);
      --card-hover-shadow: 0 20px 30px -10px rgba(153, 105, 255, 0.18);
      --container-width: 1200px;
      --radius-lg: 20px;
      --radius-md: 12px;
      --radius-sm: 8px;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

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

    /* 镭射幻彩背景氛围微光层 */
    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 100vw;
      max-width: 1600px;
      height: 100vh;
      background: radial-gradient(circle at 15% 15%, rgba(255, 118, 172, 0.08) 0%, transparent 40%),
                  radial-gradient(circle at 85% 25%, rgba(0, 210, 255, 0.08) 0%, transparent 45%),
                  radial-gradient(circle at 50% 75%, rgba(153, 105, 255, 0.06) 0%, transparent 50%);
      pointer-events: none;
      z-index: -1;
    }

    /* 统一居中容器体系 */
    .site-container {
      width: 100%;
      max-width: var(--container-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: 100;
      background: rgba(255, 255, 255, 0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(226, 232, 240, 0.8);
      transition: all 0.3s ease;
    }

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

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

    .brand-wrap .ai-page-logo {
      height: 40px;
      width: auto;
      display: block;
    }

    .brand-name {
      font-size: 20px;
      font-weight: 800;
      letter-spacing: -0.5px;
      background: var(--holo-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

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

    .nav-links a {
      color: var(--text-main);
      text-decoration: none;
      font-size: 15px;
      font-weight: 500;
      padding: 10px 14px;
      border-radius: var(--radius-sm);
      transition: color 0.2s ease, background-color 0.2s ease;
      display: inline-block;
    }

    .nav-links a:hover {
      color: #7928ca;
      background: rgba(153, 105, 255, 0.08);
    }

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

    .btn-holo {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 15px;
      font-weight: 600;
      color: #ffffff !important;
      text-decoration: none;
      background: var(--holo-gradient);
      background-size: 200% 200%;
      border-radius: 999px;
      box-shadow: 0 4px 15px rgba(153, 105, 255, 0.3);
      transition: all 0.3s ease;
      border: none;
      cursor: pointer;
    }

    .btn-holo:hover {
      background-position: right center;
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(0, 210, 255, 0.4);
    }

    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 20px;
      font-size: 15px;
      font-weight: 600;
      color: var(--text-main);
      text-decoration: none;
      border: 1px solid var(--line-color);
      border-radius: 999px;
      background: #ffffff;
      transition: all 0.2s ease;
    }

    .btn-outline:hover {
      border-color: #9969ff;
      color: #9969ff;
      background: rgba(153, 105, 255, 0.05);
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .mobile-menu-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background-color: var(--text-main);
      margin: 5px 0;
      transition: 0.3s;
    }

    /* 首屏 Hero 区域 (禁止出现图片) */
    .hero-section {
      padding: 80px 0 60px;
      position: relative;
    }

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

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: rgba(255, 255, 255, 0.9);
      border: 1px solid rgba(153, 105, 255, 0.3);
      box-shadow: 0 2px 10px rgba(153, 105, 255, 0.1);
      border-radius: 999px;
      font-size: 13px;
      font-weight: 600;
      color: #6366f1;
      margin-bottom: 24px;
    }

    .hero-badge .dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #00d2ff;
      box-shadow: 0 0 8px #00d2ff;
    }

    h1.hero-title {
      font-size: 44px;
      line-height: 1.25;
      font-weight: 800;
      letter-spacing: -1px;
      margin-bottom: 20px;
      color: var(--text-main);
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 36px;
    }

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

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

    .metric-card {
      background: var(--bg-card);
      border: 1px solid var(--line-color);
      border-radius: var(--radius-md);
      padding: 24px 16px;
      text-align: center;
      position: relative;
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
    }

    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-hover-shadow);
      border-color: rgba(153, 105, 255, 0.4);
    }

    .metric-card::before {
      content: "";
      position: absolute;
      top: 0;
      left: 20%;
      right: 20%;
      height: 2px;
      background: var(--holo-gradient);
      border-radius: 0 0 4px 4px;
    }

    .metric-val {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      display: block;
      margin-bottom: 4px;
    }

    .metric-label {
      font-size: 14px;
      color: var(--text-light);
    }

    /* 通用章节规范 */
    .section-wrap {
      padding: 70px 0;
      border-bottom: 1px solid rgba(226, 232, 240, 0.6);
      position: relative;
    }

    .section-header {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 48px;
    }

    .section-tag {
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: #9969ff;
      margin-bottom: 8px;
      display: block;
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
    }

    /* 平台介绍与多模型能力 */
    .model-chips {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-top: 30px;
    }

    .model-chip {
      background: #ffffff;
      border: 1px solid var(--line-color);
      padding: 8px 16px;
      border-radius: 999px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-muted);
      transition: all 0.2s ease;
      box-shadow: 0 2px 5px rgba(0,0,0,0.02);
    }

    .model-chip:hover {
      border-color: #9969ff;
      color: #7928ca;
      background: rgba(153, 105, 255, 0.05);
      transform: translateY(-2px);
    }

    /* 卡片网格体系 */
    .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;
    }

    .holo-card {
      background: #ffffff;
      border: 1px solid var(--line-color);
      border-radius: var(--radius-md);
      padding: 28px 24px;
      box-shadow: var(--card-shadow);
      position: relative;
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }

    .holo-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--card-hover-shadow);
      border-color: rgba(153, 105, 255, 0.5);
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: rgba(153, 105, 255, 0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 18px;
      font-weight: bold;
      color: #7928ca;
    }

    .card-title {
      font-size: 19px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .card-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

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

    .step-item {
      background: #ffffff;
      border: 1px solid var(--line-color);
      border-radius: var(--radius-md);
      padding: 24px 20px;
      position: relative;
      box-shadow: var(--card-shadow);
    }

    .step-number {
      font-size: 12px;
      font-weight: 800;
      color: #9969ff;
      background: rgba(153, 105, 255, 0.12);
      padding: 4px 10px;
      border-radius: 999px;
      display: inline-block;
      margin-bottom: 12px;
    }

    /* 案例图片展示容器 */
    .banner-gallery {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 24px;
    }

    .banner-card {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--line-color);
      background: #ffffff;
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
    }

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

    .banner-card img {
      width: 100%;
      height: 180px;
      object-fit: cover;
      display: block;
    }

    .banner-card-info {
      padding: 14px;
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
      text-align: center;
    }

    .feature-showcase-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
      margin-top: 32px;
    }

    .media-card {
      background: #ffffff;
      border: 1px solid var(--line-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--card-shadow);
    }

    .media-card img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }

    .media-card-content {
      padding: 20px;
    }

    /* 对比评测表格与卡片 */
    .review-summary-card {
      background: linear-gradient(135deg, rgba(255,255,255,0.95), rgba(243, 244, 246, 0.9));
      border: 1px solid rgba(153, 105, 255, 0.3);
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--card-shadow);
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 30px;
    }

    .score-badge-area {
      display: flex;
      align-items: baseline;
      gap: 12px;
    }

    .score-number {
      font-size: 56px;
      font-weight: 900;
      color: #7928ca;
      line-height: 1;
    }

    .score-max {
      font-size: 18px;
      color: var(--text-light);
    }

    .stars-view {
      color: #f59e0b;
      font-size: 20px;
      font-weight: bold;
    }

    .table-responsive {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border: 1px solid var(--line-color);
      border-radius: var(--radius-md);
      box-shadow: var(--card-shadow);
    }

    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 15px;
    }

    .comparison-table th, .comparison-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--line-color);
    }

    .comparison-table th {
      background: #f8fafc;
      color: var(--text-main);
      font-weight: 700;
    }

    .highlight-col {
      background: rgba(153, 105, 255, 0.04);
      font-weight: 600;
      color: #6366f1;
    }

    /* 用户评论 */
    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--line-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .testimonial-quote {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 20px;
      position: relative;
    }

    .user-info {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .user-avatar-tag {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--holo-gradient);
      color: #ffffff;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 14px;
    }

    .user-meta h4 {
      font-size: 15px;
      color: var(--text-main);
      font-weight: 700;
    }

    .user-meta span {
      font-size: 13px;
      color: var(--text-light);
    }

    /* 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(--line-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--card-shadow);
      transition: all 0.2s ease;
    }

    .faq-item:hover {
      border-color: rgba(153, 105, 255, 0.4);
    }

    .faq-question {
      width: 100%;
      text-align: left;
      padding: 18px 24px;
      background: none;
      border: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
    }

    .faq-icon {
      font-size: 18px;
      transition: transform 0.3s ease;
      color: #9969ff;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
      padding: 0 24px;
      color: var(--text-muted);
      font-size: 15px;
      line-height: 1.6;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding-bottom: 18px;
      transition: max-height 0.3s ease-in;
    }

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

    /* 表单组件 */
    .form-container-card {
      background: #ffffff;
      border: 1px solid var(--line-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--card-shadow);
      max-width: 780px;
      margin: 0 auto;
    }

    .form-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
      margin-bottom: 20px;
    }

    .form-group-full {
      grid-column: span 2;
    }

    .form-label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 15px;
      border: 1px solid var(--line-color);
      border-radius: var(--radius-sm);
      background: #f8fafc;
      color: var(--text-main);
      transition: all 0.2s ease;
      font-family: inherit;
    }

    .form-control:focus {
      outline: none;
      border-color: #9969ff;
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(153, 105, 255, 0.15);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }

    /* 资讯列表与标签云 */
    .article-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .article-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 16px 20px;
      background: #ffffff;
      border: 1px solid var(--line-color);
      border-radius: var(--radius-md);
      box-shadow: var(--card-shadow);
      text-decoration: none;
      color: var(--text-main);
      transition: all 0.2s ease;
    }

    .article-item:hover {
      border-color: #9969ff;
      transform: translateX(4px);
    }

    .article-title {
      font-weight: 600;
      font-size: 15px;
    }

    .article-arrow {
      color: #9969ff;
      font-weight: 700;
    }

    /* 联系与客服展示 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      align-items: center;
    }

    .contact-info-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .contact-info-item {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 15px;
      color: var(--text-muted);
    }

    .contact-info-item strong {
      color: var(--text-main);
      width: 90px;
    }

    .qr-card-wrap {
      display: flex;
      flex-direction: column;
      align-items: center;
      background: #ffffff;
      border: 1px solid var(--line-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--card-shadow);
      text-align: center;
    }

    .qr-card-wrap img {
      width: 170px;
      height: 170px;
      object-fit: contain;
      margin-bottom: 12px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--line-color);
    }

    /* 浮动客服与返回顶部 */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 99;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .floating-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--line-color);
      box-shadow: 0 4px 15px rgba(0,0,0,0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--text-main);
      text-decoration: none;
      cursor: pointer;
      transition: all 0.2s ease;
      font-size: 13px;
      font-weight: 700;
    }

    .floating-btn:hover {
      background: var(--holo-gradient);
      color: #ffffff;
      transform: scale(1.05);
    }

    /* 页脚 */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--line-color);
      padding: 40px 0 30px;
      color: var(--text-muted);
      font-size: 14px;
    }

    .footer-top {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      gap: 24px;
      margin-bottom: 30px;
    }

    .footer-links-group {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 16px;
    }

    .footer-links-group a {
      color: var(--text-muted);
      text-decoration: none;
      transition: color 0.2s ease;
    }

    .footer-links-group a:hover {
      color: #7928ca;
    }

    .footer-divider {
      height: 1px;
      background: var(--line-color);
      margin-bottom: 24px;
    }

    .footer-bottom {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
    }

    .footer-copyright {
      color: var(--text-light);
      font-size: 13px;
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .step-list {
        grid-template-columns: repeat(2, 1fr);
      }
      .banner-gallery {
        grid-template-columns: repeat(2, 1fr);
      }
      .feature-showcase-grid {
        grid-template-columns: 1fr;
      }
      .contact-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      h1.hero-title {
        font-size: 30px;
      }
      .section-title {
        font-size: 26px;
      }
      .grid-3, .grid-4, .grid-2, .hero-metrics-grid, .step-list, .banner-gallery {
        grid-template-columns: 1fr;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .form-group-full {
        grid-column: span 1;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 16px 20px;
        border-bottom: 1px solid var(--line-color);
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-actions .btn-outline {
        display: none;
      }
      .review-summary-card {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
      }
    }