:root {
      --primary-blue: #0b57d0;
      --primary-vibrant: #1a73e8;
      --primary-dark: #00378a;
      --primary-light: #e8f0fe;
      --accent-cyan: #00bcd4;
      --accent-gold: #f9a825;
      --text-main: #1e293b;
      --text-muted: #475569;
      --text-light: #64748b;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --bg-subtle: #f1f5f9;
      --border-color: #e2e8f0;
      --border-focus: #3b82f6;
      --shadow-sm: 0 2px 8px rgba(11, 87, 208, 0.06);
      --shadow-md: 0 8px 24px rgba(11, 87, 208, 0.09);
      --shadow-lg: 0 16px 36px rgba(11, 87, 208, 0.12);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --transition: all 0.25s 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-page);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
      background-image: radial-gradient(at 0% 0%, rgba(26, 115, 232, 0.05) 0px, transparent 50%), radial-gradient(at 100% 100%, rgba(0, 188, 212, 0.04) 0px, transparent 50%);
      background-attachment: fixed;
    }

    .container {
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 12px rgba(0,0,0,0.03);
    }

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

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

    .ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }

    .brand-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary-dark);
      letter-spacing: -0.5px;
    }

    .brand-badge {
      font-size: 0.75rem;
      background: var(--primary-light);
      color: var(--primary-blue);
      padding: 2px 8px;
      border-radius: 99px;
      font-weight: 600;
    }

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

    .nav-links li a {
      display: block;
      padding: 8px 12px;
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-muted);
      text-decoration: none;
      transition: var(--transition);
      border-radius: var(--radius-sm);
    }

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

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

    .btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: linear-gradient(135deg, var(--primary-vibrant) 0%, var(--primary-blue) 100%);
      color: #ffffff !important;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      font-weight: 600;
      text-decoration: none;
      border: none;
      cursor: pointer;
      box-shadow: 0 4px 14px rgba(26, 115, 232, 0.3);
      transition: var(--transition);
      white-space: nowrap;
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(26, 115, 232, 0.4);
      background: linear-gradient(135deg, #2b7ff0 0%, #084bbb 100%);
    }

    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: 1.5px solid var(--primary-blue);
      color: var(--primary-blue);
      padding: 9px 20px;
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      font-weight: 600;
      text-decoration: none;
      background: #ffffff;
      transition: var(--transition);
      white-space: nowrap;
    }

    .btn-outline:hover {
      background: var(--primary-light);
      color: var(--primary-dark);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 4px;
    }

    /* Section 通用样式 */
    section {
      padding: 80px 0;
      position: relative;
    }

    .section-header {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 50px auto;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.82rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--primary-blue);
      background: var(--primary-light);
      padding: 4px 14px;
      border-radius: 99px;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      line-height: 1.3;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
    }

    /* 首屏 Hero（无图片） */
    .hero-section {
      padding: 90px 0 70px 0;
      background: linear-gradient(180deg, rgba(232, 240, 254, 0.6) 0%, rgba(248, 250, 252, 0) 100%);
      text-align: center;
    }

    .hero-wrap {
      max-width: 900px;
      margin: 0 auto;
    }

    .hero-badge-pill {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 6px 16px;
      border-radius: 99px;
      font-size: 0.88rem;
      color: var(--primary-dark);
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
    }

    .hero-badge-pill span {
      background: var(--primary-blue);
      color: #fff;
      font-size: 0.72rem;
      padding: 2px 6px;
      border-radius: 99px;
      font-weight: bold;
    }

    h1.hero-main-title {
      font-size: 2.6rem;
      font-weight: 900;
      color: #0f172a;
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-subtitle {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      line-height: 1.7;
    }

    .hero-buttons {
      display: flex;
      justify-content: center;
      gap: 16px;
      margin-bottom: 50px;
      flex-wrap: wrap;
    }

    .hero-cta-btn {
      padding: 14px 34px;
      font-size: 1.05rem;
      font-weight: 700;
    }

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

    .metric-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 24px 16px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      border-top: 3px solid var(--primary-vibrant);
    }

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

    .metric-val {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary-blue);
      line-height: 1.2;
      margin-bottom: 6px;
    }

    .metric-lbl {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 平台矩阵标签云 */
    .supported-models {
      padding: 40px 0;
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }

    .models-title {
      text-align: center;
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-light);
      margin-bottom: 20px;
      letter-spacing: 0.5px;
    }

    .tags-cloud {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      max-width: 1100px;
      margin: 0 auto;
    }

    .model-tag {
      background: var(--bg-subtle);
      color: var(--text-main);
      padding: 6px 14px;
      border-radius: 6px;
      font-size: 0.85rem;
      font-weight: 600;
      border: 1px solid var(--border-color);
      transition: var(--transition);
    }

    .model-tag:hover {
      background: var(--primary-light);
      color: var(--primary-blue);
      border-color: var(--primary-vibrant);
    }

    /* 网格通用布局 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }

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

    /* 业务卡片 */
    .feature-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .feature-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: #cbd5e1;
    }

    .feature-icon-box {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: var(--primary-light);
      color: var(--primary-blue);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 18px;
      font-weight: bold;
    }

    .feature-title {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .feature-text {
      font-size: 0.93rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .feature-foot {
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--primary-blue);
      display: inline-flex;
      align-items: center;
      gap: 4px;
      text-decoration: none;
    }

    /* 关于我们与平台介绍 */
    .about-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }

    .about-list {
      list-style: none;
      margin-top: 20px;
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }

    .about-list-item {
      display: flex;
      align-items: flex-start;
      gap: 10px;
      font-size: 0.95rem;
      color: var(--text-main);
    }

    .about-list-item strong {
      color: var(--primary-dark);
    }

    .check-bullet {
      color: var(--primary-blue);
      font-weight: bold;
      flex-shrink: 0;
    }

    /* 素材展示图卡片 */
    .media-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    .media-img-wrap {
      width: 100%;
      background: #f1f5f9;
      display: block;
    }

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

    .media-body {
      padding: 20px;
    }

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

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

    /* 评测与对比表格 */
    .eval-highlight {
      background: linear-gradient(135deg, #0b57d0 0%, #1a73e8 100%);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 36px;
      margin-bottom: 40px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
      box-shadow: var(--shadow-md);
    }

    .eval-score-wrap {
      display: flex;
      align-items: center;
      gap: 18px;
    }

    .eval-score-num {
      font-size: 3.8rem;
      font-weight: 900;
      line-height: 1;
      color: #fff;
    }

    .eval-stars {
      color: #ffeb3b;
      font-size: 1.4rem;
      margin-bottom: 4px;
    }

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

    .comp-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.95rem;
    }

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

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

    .comp-table tr.highlight-row {
      background: var(--primary-light);
      font-weight: 600;
    }

    .comp-table tr.highlight-row td {
      color: var(--primary-dark);
    }

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

    .flow-step-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 20px;
      text-align: center;
      position: relative;
    }

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

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

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

    /* 用户评论 */
    .review-card {
      background: #ffffff;
      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-stars {
      color: var(--accent-gold);
      margin-bottom: 12px;
      font-size: 1rem;
    }

    .review-quote {
      font-size: 0.93rem;
      color: var(--text-main);
      line-height: 1.6;
      margin-bottom: 20px;
      font-style: italic;
    }

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

    .reviewer-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary-blue);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
    }

    .reviewer-name {
      font-size: 0.92rem;
      font-weight: 700;
      color: var(--text-main);
    }

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

    /* FAQ 手风琴 */
    .faq-accordion {
      max-width: 900px;
      margin: 0 auto;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 14px;
      overflow: hidden;
      transition: var(--transition);
    }

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

    .faq-question {
      padding: 18px 24px;
      font-weight: 700;
      font-size: 1.05rem;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

    .faq-toggle-icon {
      font-size: 1.2rem;
      color: var(--primary-blue);
      transition: transform 0.25s ease;
    }

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

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

    .faq-answer-inner {
      padding: 0 24px 20px 24px;
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 表单板块 */
    .form-wrap {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-group label {
      display: block;
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .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);
      outline: none;
      transition: var(--transition);
      background: #fafafa;
    }

    .form-control:focus {
      background: #ffffff;
      border-color: var(--border-focus);
      box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.15);
    }

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

    /* 资讯与友情链接 */
    .article-list {
      list-style: none;
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }

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

    .article-item:hover {
      border-color: var(--primary-blue);
      transform: translateX(4px);
    }

    .article-link {
      font-size: 0.95rem;
      color: var(--text-main);
      text-decoration: none;
      font-weight: 600;
    }

    .article-link:hover {
      color: var(--primary-blue);
    }

    .article-tag {
      font-size: 0.78rem;
      color: var(--primary-blue);
      background: var(--primary-light);
      padding: 2px 8px;
      border-radius: 4px;
      flex-shrink: 0;
    }

    .banner-gallery {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 30px;
    }

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

    /* 页脚 */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px 0;
      font-size: 0.92rem;
      border-top: 1px solid #1e293b;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 18px;
    }

    .footer-col p {
      line-height: 1.6;
      margin-bottom: 12px;
    }

    .footer-links {
      list-style: none;
    }

    .footer-links li {
      margin-bottom: 10px;
    }

    .footer-links a {
      color: #94a3b8;
      text-decoration: none;
      transition: var(--transition);
    }

    .footer-links a:hover {
      color: #ffffff;
      padding-left: 4px;
    }

    .qr-box {
      background: #1e293b;
      padding: 12px;
      border-radius: var(--radius-sm);
      display: inline-block;
      text-align: center;
      margin-top: 10px;
    }

    .qr-box img {
      width: 100px;
      height: 100px;
      display: block;
      border-radius: 4px;
      margin: 0 auto 6px auto;
    }

    .qr-box span {
      font-size: 0.78rem;
      color: #cbd5e1;
    }

    .friendly-links-wrap {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      margin-bottom: 24px;
    }

    .friendly-links-wrap h5 {
      color: #cbd5e1;
      font-size: 0.88rem;
      margin-bottom: 10px;
    }

    .friendly-links {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
    }

    .friendly-links a {
      color: #94a3b8;
      text-decoration: none;
      font-size: 0.85rem;
      transition: var(--transition);
    }

    .friendly-links a:hover {
      color: #38bdf8;
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.85rem;
      color: #64748b;
    }

    /* 浮动与组件 */
    .float-widget {
      position: fixed;
      right: 24px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      color: var(--primary-blue);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      font-size: 1.2rem;
      text-decoration: none;
      transition: var(--transition);
    }

    .float-btn:hover {
      background: var(--primary-blue);
      color: #ffffff;
      transform: scale(1.08);
    }

    .back-top {
      display: none;
    }

    /* 响应式媒体查询 */
    @media (max-width: 992px) {
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .hero-metrics { grid-template-columns: repeat(2, 1fr); }
      .flow-steps { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .banner-gallery { grid-template-columns: repeat(2, 1fr); }
      .nav-links { display: none; }
      .menu-toggle { display: block; }
      .nav-container.mobile-open .nav-links {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-lg);
      }
      .nav-container.mobile-open .nav-links li {
        width: 100%;
      }
      .nav-container.mobile-open .nav-links li a {
        padding: 12px 16px;
      }
    }

    @media (max-width: 768px) {
      section { padding: 50px 0; }
      h1.hero-main-title { font-size: 1.85rem; }
      .section-title { font-size: 1.6rem; }
      .grid-3, .grid-2, .grid-4 { grid-template-columns: 1fr; }
      .hero-metrics { grid-template-columns: 1fr; }
      .flow-steps { grid-template-columns: 1fr; }
      .article-list { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .banner-gallery { grid-template-columns: 1fr; }
      .eval-highlight { flex-direction: column; text-align: center; }
      .eval-score-wrap { flex-direction: column; }
      .about-list { grid-template-columns: 1fr; }
      .hero-buttons { flex-direction: column; }
      .hero-buttons .btn-primary, .hero-buttons .btn-outline { width: 100%; }
    }