:root {
      --primary: #7928ca;
      --primary-gradient: linear-gradient(135deg, #7928ca 0%, #ff0080 100%);
      --accent: #0070f3;
      --accent-cyan: #00dfd8;
      --bg-page: #fbfbfd;
      --bg-surface: #ffffff;
      --bg-card: #f5f6fa;
      --text-main: #111827;
      --text-muted: #4b5563;
      --border-color: #e5e7eb;
      --border-focus: #c084fc;
      --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 10px 25px -5px rgba(121, 40, 202, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.03);
      --shadow-hover: 0 20px 30px -10px rgba(121, 40, 202, 0.16);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --radius-pill: 9999px;
      --container-max: 1200px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }

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

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

    .container {
      width: 100%;
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 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);
      box-shadow: var(--shadow-sm);
    }

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

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

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

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

    .nav-links li a {
      display: block;
      padding: 10px 14px;
      font-weight: 500;
      font-size: 15px;
      color: var(--text-muted);
      border-radius: var(--radius-sm);
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary);
      background-color: rgba(121, 40, 202, 0.05);
    }

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

    .btn-nav-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 20px;
      font-size: 14px;
      font-weight: 600;
      color: #ffffff !important;
      background: var(--primary-gradient);
      border-radius: var(--radius-pill);
      box-shadow: 0 4px 12px rgba(255, 0, 128, 0.25);
    }

    .btn-nav-primary:hover {
      opacity: 0.95;
      transform: translateY(-1px);
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: 1px solid var(--border-color);
      padding: 8px;
      border-radius: var(--radius-sm);
      cursor: pointer;
    }

    /* 首屏 Hero 区域 (严格无图片) */
    .hero-section {
      position: relative;
      padding: 80px 0 60px;
      background: radial-gradient(circle at 50% 0%, rgba(121, 40, 202, 0.08) 0%, rgba(0, 223, 216, 0.03) 50%, transparent 80%);
      text-align: center;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #ffffff;
      border: 1px solid #f3d9fa;
      box-shadow: 0 2px 10px rgba(121, 40, 202, 0.08);
      border-radius: var(--radius-pill);
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: clamp(32px, 5vw, 52px);
      font-weight: 800;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.02em;
    }

    .hero-gradient-text {
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      max-width: 760px;
      margin: 0 auto 36px;
      font-size: 18px;
      color: var(--text-muted);
      line-height: 1.7;
    }

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

    .btn-hero-main {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 14px 34px;
      font-size: 16px;
      font-weight: 700;
      color: #ffffff !important;
      background: var(--primary-gradient);
      border-radius: var(--radius-pill);
      box-shadow: 0 8px 24px rgba(255, 0, 128, 0.3);
      transition: transform 0.2s, box-shadow 0.2s;
    }

    .btn-hero-main:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 30px rgba(255, 0, 128, 0.4);
    }

    .btn-hero-outline {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 13px 30px;
      font-size: 16px;
      font-weight: 600;
      color: var(--text-main);
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-pill);
      box-shadow: var(--shadow-sm);
    }

    .btn-hero-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background-color: #faf5ff;
    }

    .hero-stats-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 960px;
      margin: 0 auto;
    }

    .stat-card {
      background: rgba(255, 255, 255, 0.85);
      border: 1px solid #f1f1f5;
      padding: 20px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: transform 0.3s;
    }

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

    .stat-val {
      font-size: 28px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

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

    /* 区域通用结构 */
    .section-wrap {
      padding: 70px 0;
      position: relative;
    }

    .section-header {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 50px;
    }

    .section-tag {
      display: inline-block;
      font-size: 12px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      padding: 4px 12px;
      background: rgba(121, 40, 202, 0.08);
      color: var(--primary);
      border-radius: var(--radius-pill);
      margin-bottom: 12px;
    }

    .section-title {
      font-size: clamp(26px, 3.5vw, 36px);
      font-weight: 700;
      color: var(--text-main);
      line-height: 1.35;
      margin-bottom: 14px;
    }

    .section-intro {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 模型矩阵胶囊云 */
    .models-chip-grid {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-top: 24px;
    }

    .model-chip {
      background: #ffffff;
      border: 1px solid #e9ecef;
      padding: 8px 16px;
      border-radius: var(--radius-pill);
      font-size: 13px;
      font-weight: 600;
      color: var(--text-muted);
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.02);
      transition: all 0.2s;
    }

    .model-chip:hover {
      color: var(--primary);
      border-color: var(--border-focus);
      transform: scale(1.04);
    }

    /* 功能卡片网格 */
    .grid-cards-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .feature-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
      border-color: #e9d5ff;
    }

    .card-badge-trend {
      display: inline-block;
      align-self: flex-start;
      padding: 4px 10px;
      border-radius: var(--radius-pill);
      font-size: 12px;
      font-weight: 600;
      background: rgba(255, 0, 128, 0.08);
      color: #ff0080;
      margin-bottom: 16px;
    }

    .card-title {
      font-size: 20px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .card-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 20px;
      flex-grow: 1;
    }

    .card-footer-action {
      display: flex;
      align-items: center;
      gap: 6px;
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
    }

    /* 对比评测表格 */
    .eval-box {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      overflow: hidden;
      padding: 36px;
    }

    .eval-summary-bar {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      padding-bottom: 28px;
      margin-bottom: 28px;
      border-bottom: 2px dashed #f0f0f5;
    }

    .eval-score-view {
      display: flex;
      align-items: center;
      gap: 24px;
    }

    .score-badge {
      background: var(--primary-gradient);
      color: #ffffff;
      padding: 16px 24px;
      border-radius: var(--radius-md);
      text-align: center;
      box-shadow: 0 4px 14px rgba(121, 40, 202, 0.25);
    }

    .score-badge .big-num {
      font-size: 32px;
      font-weight: 800;
      line-height: 1;
    }

    .score-badge .sub-text {
      font-size: 12px;
      opacity: 0.9;
      margin-top: 4px;
    }

    .rating-stars {
      color: #f59e0b;
      font-size: 18px;
      font-weight: 700;
    }

    .table-responsive {
      width: 100%;
      overflow-x: auto;
    }

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

    .styled-table th,
    .styled-table td {
      padding: 16px 20px;
      border-bottom: 1px solid #f1f2f6;
      font-size: 14px;
    }

    .styled-table th {
      background-color: #fafafc;
      font-weight: 600;
      color: var(--text-main);
    }

    .styled-table tbody tr:hover {
      background-color: #faf5ff;
    }

    .tag-superior {
      display: inline-block;
      padding: 3px 8px;
      background: rgba(16, 185, 129, 0.1);
      color: #059669;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 12px;
    }

    /* 素材与案例展示区 */
    .media-gallery-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 20px;
      margin-bottom: 24px;
    }

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

    .media-card .img-box {
      width: 100%;
      aspect-ratio: 16/9;
      background: #f3f4f6;
      overflow: hidden;
    }

    .media-card.square .img-box {
      aspect-ratio: 1/1;
    }

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

    .media-card-body {
      padding: 16px 20px;
    }

    .media-card-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .media-card-desc {
      font-size: 13px;
      color: var(--text-muted);
    }

    .banner-quad-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 24px;
    }

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

    .banner-item img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: contain;
    }

    /* 流程步骤 */
    .steps-chain-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

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

    .step-num-pill {
      display: inline-block;
      width: 38px;
      height: 38px;
      line-height: 38px;
      border-radius: 50%;
      background: var(--primary-gradient);
      color: #ffffff;
      font-weight: 700;
      margin-bottom: 16px;
      box-shadow: 0 4px 10px rgba(121, 40, 202, 0.25);
    }

    .step-title {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .step-desc {
      font-size: 13px;
      color: var(--text-muted);
    }

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

    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 26px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .testimonial-content {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 20px;
      font-style: italic;
    }

    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f3f4f6;
      padding-top: 16px;
    }

    .user-avatar-tag {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #faf5ff;
      color: var(--primary);
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      border: 1px solid #e9d5ff;
    }

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

    .user-role {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* FAQ 折叠 */
    .faq-accordion {
      max-width: 900px;
      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;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 20px 24px;
      font-size: 16px;
      font-weight: 600;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #ffffff;
      transition: background 0.2s;
    }

    .faq-question:hover {
      background-color: #fafafc;
    }

    .faq-icon-arrow {
      transition: transform 0.25s ease;
      font-size: 12px;
      color: var(--primary);
    }

    .faq-item.active .faq-icon-arrow {
      transform: rotate(180deg);
    }

    .faq-answer {
      display: none;
      padding: 0 24px 20px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    /* 表单与联系模块 */
    .contact-form-layout {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 36px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }

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

    .contact-card-title {
      font-size: 24px;
      font-weight: 700;
      margin-bottom: 14px;
      color: var(--text-main);
    }

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

    .contact-meta-item {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 14px;
      color: var(--text-muted);
    }

    .contact-meta-item strong {
      color: var(--text-main);
    }

    .qr-box-wrap {
      display: flex;
      align-items: center;
      gap: 16px;
      padding: 16px;
      background: #fafafc;
      border-radius: var(--radius-md);
      border: 1px solid #edf0f5;
    }

    .qr-box-wrap img {
      width: 90px;
      height: 90px;
      object-fit: contain;
      border-radius: 6px;
      background: #fff;
    }

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

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

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

    .form-input,
    .form-select,
    .form-textarea {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 14px;
      background-color: #fafafc;
      color: var(--text-main);
      outline: none;
      transition: border 0.2s;
    }

    .form-input:focus,
    .form-select:focus,
    .form-textarea:focus {
      border-color: var(--primary);
      background-color: #ffffff;
      box-shadow: 0 0 0 3px rgba(121, 40, 202, 0.1);
    }

    .btn-submit-form {
      padding: 14px;
      border: none;
      border-radius: var(--radius-pill);
      background: var(--primary-gradient);
      color: #ffffff;
      font-weight: 700;
      font-size: 15px;
      cursor: pointer;
      box-shadow: 0 4px 14px rgba(255, 0, 128, 0.25);
      transition: transform 0.2s, opacity 0.2s;
    }

    .btn-submit-form:hover {
      opacity: 0.95;
      transform: translateY(-1px);
    }

    /* 资讯与外链 */
    .articles-flex-box {
      background: #ffffff;
      border-radius: var(--radius-md);
      padding: 24px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .links-chip-container {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 14px;
    }

    .link-chip-item {
      display: inline-block;
      padding: 8px 16px;
      background: #fafafc;
      border: 1px solid #e5e7eb;
      border-radius: var(--radius-pill);
      font-size: 13px;
      color: var(--text-muted);
    }

    .link-chip-item:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: #ffffff;
    }

    /* 页脚 */
    .site-footer {
      background-color: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 50px 0 30px;
      color: var(--text-muted);
      font-size: 14px;
    }

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

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

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

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

    .footer-bottom-bar {
      border-top: 1px solid #f0f0f5;
      padding-top: 24px;
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: center;
      gap: 16px;
    }

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

    .friend-links-wrap a {
      font-size: 13px;
      color: #6b7280;
    }

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

    /* 浮动组件 */
    .floating-tools {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: var(--primary);
      font-weight: 700;
      transition: all 0.2s;
    }

    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
      transform: translateY(-2px);
    }

    /* 响应式样式适配 */
    @media (max-width: 992px) {
      .hero-stats-row {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-cards-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .steps-chain-row {
        grid-template-columns: repeat(2, 1fr);
      }
      .testimonials-grid {
        grid-template-columns: 1fr;
      }
      .contact-form-layout {
        grid-template-columns: 1fr;
      }
      .footer-grid-top {
        grid-template-columns: 1fr;
      }
      .banner-quad-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .media-gallery-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 16px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .grid-cards-3 {
        grid-template-columns: 1fr;
      }
      .steps-chain-row {
        grid-template-columns: 1fr;
      }
      .eval-summary-bar {
        flex-direction: column;
        align-items: flex-start;
      }
      .banner-quad-grid {
        grid-template-columns: 1fr;
      }
      .hero-section {
        padding: 50px 0 40px;
      }
      .hero-stats-row {
        grid-template-columns: 1fr;
      }
    }