:root {
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --primary: #4338ca;
      --primary-hover: #3730a3;
      --accent-orange: #ff5400;
      --accent-cyan: #06b6d4;
      --accent-yellow: #facc15;
      --text-dark: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
      --shadow-solid: 4px 4px 0px #0f172a;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
      --shadow-md: 0 4px 12px rgba(15,23,42,0.08);
      --container-max: 1200px;
      --radius-md: 8px;
      --radius-lg: 14px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-dark);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

    /* 宽度与容器规范 */
    .container {
      width: 100%;
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 顶部导航 */
    .header-nav {
      position: sticky;
      top: 0;
      z-index: 1000;
      background-color: #ffffff;
      border-bottom: 2px solid var(--text-dark);
      box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .nav-brand {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .nav-brand .ai-page-logo {
      height: 42px;
      width: auto;
      object-fit: contain;
    }
    .brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--text-dark);
      letter-spacing: -0.5px;
    }
    .brand-tag {
      background-color: var(--accent-yellow);
      color: var(--text-dark);
      font-size: 0.75rem;
      font-weight: 700;
      padding: 2px 6px;
      border: 1px solid var(--text-dark);
      border-radius: 4px;
      margin-left: 6px;
    }

    /* 强制 gap: 0 */
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links li a {
      display: inline-block;
      padding: 8px 12px;
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--text-dark);
      transition: color 0.2s, background-color 0.2s;
      border-radius: 4px;
    }
    .nav-links li a:hover {
      color: var(--primary);
      background-color: #eef2ff;
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      padding: 10px 20px;
      border-radius: var(--radius-md);
      transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.2s;
      cursor: pointer;
      text-align: center;
      border: 2px solid var(--text-dark);
    }
    .btn:hover {
      transform: translate(-2px, -2px);
      box-shadow: var(--shadow-solid);
    }
    .btn:active {
      transform: translate(0, 0);
      box-shadow: none;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #ffffff;
    }
    .btn-accent {
      background-color: var(--accent-orange);
      color: #ffffff;
    }
    .btn-secondary {
      background-color: #ffffff;
      color: var(--text-dark);
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: 2px solid var(--text-dark);
      padding: 6px 10px;
      font-size: 1.25rem;
      cursor: pointer;
      border-radius: 6px;
    }

    /* 视觉首屏 (无任何图片) */
    .hero-section {
      background: linear-gradient(135deg, #eef2ff 0%, #fae8ff 50%, #ffedd5 100%);
      border-bottom: 2px solid var(--text-dark);
      padding: 70px 0 60px 0;
    }
    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background-color: #ffffff;
      border: 2px solid var(--text-dark);
      padding: 6px 16px;
      border-radius: 50px;
      font-size: 0.88rem;
      font-weight: 700;
      box-shadow: var(--shadow-solid);
      margin-bottom: 24px;
    }
    .hero-badge .dot {
      width: 10px;
      height: 10px;
      background-color: var(--accent-orange);
      border-radius: 50%;
    }
    .hero-title {
      font-size: 2.5rem;
      font-weight: 900;
      line-height: 1.25;
      color: var(--text-dark);
      margin-bottom: 20px;
      letter-spacing: -1px;
    }
    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text-muted);
      margin-bottom: 32px;
      max-width: 760px;
      margin-left: auto;
      margin-right: auto;
      font-weight: 500;
    }
    .hero-cta-group {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 16px;
      margin-bottom: 40px;
    }
    .btn-hero-official {
      background-color: var(--accent-orange);
      color: #ffffff;
      font-size: 1.1rem;
      padding: 14px 32px;
    }
    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 20px;
    }
    .metric-card {
      background-color: #ffffff;
      border: 2px solid var(--text-dark);
      padding: 20px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-solid);
      text-align: left;
    }
    .metric-card .num {
      font-size: 1.75rem;
      font-weight: 900;
      color: var(--primary);
    }
    .metric-card .label {
      font-size: 0.88rem;
      color: var(--text-muted);
      font-weight: 600;
      margin-top: 4px;
    }

    /* 通用Section布局 */
    .section-wrap {
      padding: 70px 0;
      border-bottom: 1px solid var(--border-color);
    }
    .section-header {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 50px auto;
    }
    .section-kicker {
      display: inline-block;
      text-transform: uppercase;
      font-size: 0.82rem;
      font-weight: 800;
      color: var(--accent-orange);
      background-color: #fff1eb;
      padding: 4px 12px;
      border-radius: 20px;
      margin-bottom: 12px;
      border: 1px solid #fed7aa;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: var(--text-dark);
      margin-bottom: 12px;
      letter-spacing: -0.5px;
    }
    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
    }

    /* 关于我们 / 平台介绍 */
    .about-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 32px;
      align-items: center;
    }
    .about-card {
      background-color: #ffffff;
      border: 2px solid var(--text-dark);
      padding: 36px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-solid);
    }
    .about-list {
      list-style: none;
      margin-top: 20px;
    }
    .about-list li {
      position: relative;
      padding-left: 28px;
      margin-bottom: 14px;
      font-weight: 600;
      color: var(--text-dark);
    }
    .about-list li::before {
      content: "✓";
      position: absolute;
      left: 0;
      top: 0;
      color: var(--accent-orange);
      font-weight: 900;
    }
    .model-badge-box {
      background-color: #ffffff;
      border: 2px solid var(--text-dark);
      padding: 30px;
      border-radius: var(--radius-lg);
      box-shadow: 4px 4px 0px var(--accent-cyan);
    }
    .model-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 16px;
    }
    .model-tag {
      background: #f1f5f9;
      border: 1px solid var(--text-dark);
      padding: 6px 12px;
      border-radius: 4px;
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--text-dark);
    }
    .model-tag.highlight {
      background-color: var(--accent-yellow);
    }

    /* 服务与一站式制作卡片 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .service-card {
      background-color: #ffffff;
      border: 2px solid var(--text-dark);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.2s, box-shadow 0.2s;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-solid);
    }
    .service-card-tag {
      align-self: flex-start;
      font-size: 0.75rem;
      font-weight: 800;
      padding: 3px 8px;
      border-radius: 4px;
      border: 1px solid var(--text-dark);
      background-color: #ecfdf5;
      color: #065f46;
      margin-bottom: 12px;
    }
    .service-card h3 {
      font-size: 1.2rem;
      font-weight: 800;
      margin-bottom: 10px;
    }
    .service-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 行业解决方案与流程 */
    .step-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .step-item {
      background-color: #ffffff;
      border: 2px solid var(--text-dark);
      padding: 24px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-solid);
      position: relative;
    }
    .step-num {
      width: 36px;
      height: 36px;
      background-color: var(--accent-orange);
      color: #ffffff;
      border: 2px solid var(--text-dark);
      font-weight: 900;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 16px;
    }

    /* 案例中心 (素材图应用) */
    .case-banner-box {
      margin-bottom: 24px;
      border: 2px solid var(--text-dark);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-solid);
      background-color: #ffffff;
    }
    .case-banner-box img {
      width: 100%;
      height: auto;
      display: block;
    }
    .case-grid {
      display: grid;
      grid-template-columns: 1fr 1fr 1fr;
      gap: 24px;
    }
    .case-item {
      background-color: #ffffff;
      border: 2px solid var(--text-dark);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .case-img-wrap {
      width: 100%;
      background: #f1f5f9;
      border-bottom: 2px solid var(--text-dark);
    }
    .case-img-wrap img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }
    .case-info {
      padding: 16px;
    }
    .case-info h4 {
      font-size: 1.05rem;
      font-weight: 800;
      margin-bottom: 6px;
    }
    .case-info p {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* 对比评测要求板块 */
    .review-score-banner {
      background: linear-gradient(135deg, #fef08a 0%, #fed7aa 100%);
      border: 2px solid var(--text-dark);
      border-radius: var(--radius-lg);
      padding: 24px 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: var(--shadow-solid);
      margin-bottom: 30px;
    }
    .score-left h3 {
      font-size: 1.4rem;
      font-weight: 900;
      margin-bottom: 4px;
    }
    .score-left p {
      font-size: 0.95rem;
      color: #7c2d12;
      font-weight: 600;
    }
    .score-badge {
      text-align: right;
    }
    .score-stars {
      color: #ea580c;
      font-size: 1.5rem;
      letter-spacing: 2px;
    }
    .score-number {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--text-dark);
      line-height: 1;
    }
    .score-total {
      font-size: 1rem;
      color: #78350f;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      border: 2px solid var(--text-dark);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-solid);
      background-color: #ffffff;
    }
    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .comparison-table th,
    .comparison-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }
    .comparison-table th {
      background-color: #f1f5f9;
      font-weight: 800;
      border-bottom: 2px solid var(--text-dark);
    }
    .comparison-table tr:hover td {
      background-color: #faf5ff;
    }
    .comparison-table .highlight-col {
      background-color: #f0fdf4;
      font-weight: 700;
      color: #166534;
    }

    /* 需求匹配与表单板块 */
    .matcher-wrap {
      display: grid;
      grid-template-columns: 1fr 1.1fr;
      gap: 36px;
      align-items: start;
    }
    .matcher-info {
      background-color: #ffffff;
      border: 2px solid var(--text-dark);
      padding: 32px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-solid);
    }
    .form-card {
      background-color: #ffffff;
      border: 2px solid var(--text-dark);
      padding: 32px;
      border-radius: var(--radius-lg);
      box-shadow: 4px 4px 0px var(--primary);
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-group label {
      display: block;
      font-weight: 700;
      font-size: 0.9rem;
      margin-bottom: 6px;
      color: var(--text-dark);
    }
    .form-control {
      width: 100%;
      padding: 12px 14px;
      font-size: 0.95rem;
      border: 2px solid var(--text-dark);
      border-radius: 6px;
      background-color: #f8fafc;
      color: var(--text-dark);
      outline: none;
      transition: border-color 0.2s, background-color 0.2s;
    }
    .form-control:focus {
      border-color: var(--primary);
      background-color: #ffffff;
    }
    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    /* Token 比价 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .pricing-card {
      background-color: #ffffff;
      border: 2px solid var(--text-dark);
      border-radius: var(--radius-lg);
      padding: 32px 24px;
      box-shadow: var(--shadow-solid);
      position: relative;
    }
    .pricing-badge {
      position: absolute;
      top: -12px;
      right: 20px;
      background-color: var(--accent-orange);
      color: #ffffff;
      font-weight: 800;
      font-size: 0.75rem;
      padding: 4px 10px;
      border-radius: 20px;
      border: 2px solid var(--text-dark);
    }
    .pricing-price {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--primary);
      margin: 16px 0;
    }
    .pricing-features {
      list-style: none;
      margin-bottom: 24px;
    }
    .pricing-features li {
      font-size: 0.9rem;
      margin-bottom: 10px;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* 用户评论 (6条) */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .testimonial-card {
      background-color: #ffffff;
      border: 2px solid var(--text-dark);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-solid);
    }
    .user-profile {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 12px;
    }
    .user-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background-color: #e0e7ff;
      border: 2px solid var(--text-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      color: var(--primary);
    }
    .user-info h4 {
      font-size: 0.95rem;
      font-weight: 800;
    }
    .user-info span {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* FAQ 折叠面板 */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
    }
    .faq-item {
      background-color: #ffffff;
      border: 2px solid var(--text-dark);
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }
    .faq-question {
      width: 100%;
      padding: 18px 24px;
      text-align: left;
      font-size: 1.05rem;
      font-weight: 800;
      background: none;
      border: none;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--text-dark);
    }
    .faq-question:hover {
      background-color: #f8fafc;
    }
    .faq-answer {
      padding: 0 24px 18px 24px;
      font-size: 0.95rem;
      color: var(--text-muted);
      display: none;
      line-height: 1.6;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-icon {
      font-size: 1.25rem;
      font-weight: 900;
      transition: transform 0.2s;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }

    /* 行业资讯 / 最新文章 */
    .news-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 28px;
    }
    .news-card {
      background-color: #ffffff;
      border: 2px solid var(--text-dark);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-solid);
    }
    .news-links-list {
      list-style: none;
    }
    .news-links-list li {
      padding: 12px 0;
      border-bottom: 1px dashed var(--border-color);
    }
    .news-links-list li:last-child {
      border-bottom: none;
    }
    .news-links-list a {
      font-weight: 700;
      color: var(--text-dark);
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .news-links-list a:hover {
      color: var(--primary);
    }

    /* 联系我们与代理 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 32px;
      align-items: center;
    }
    .contact-details {
      background-color: #ffffff;
      border: 2px solid var(--text-dark);
      padding: 32px;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-solid);
    }
    .contact-qr-box {
      text-align: center;
      background-color: #ffffff;
      border: 2px solid var(--text-dark);
      padding: 28px;
      border-radius: var(--radius-lg);
      box-shadow: 4px 4px 0px var(--accent-orange);
    }
    .contact-qr-box img {
      max-width: 180px;
      width: 100%;
      height: auto;
      border: 2px solid var(--text-dark);
      border-radius: 8px;
      margin-bottom: 12px;
    }

    /* 页脚 */
    .site-footer {
      background-color: #ffffff;
      border-top: 2px solid var(--text-dark);
      padding: 50px 0 30px 0;
    }
    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-brand h4 {
      font-size: 1.3rem;
      font-weight: 900;
      margin-bottom: 10px;
    }
    .footer-brand p {
      font-size: 0.9rem;
      color: var(--text-muted);
      max-width: 380px;
    }
    .footer-links-col h5 {
      font-size: 1rem;
      font-weight: 800;
      margin-bottom: 14px;
      color: var(--text-dark);
    }
    .footer-nav {
      list-style: none;
    }
    .footer-nav li {
      margin-bottom: 8px;
    }
    .footer-nav a {
      font-size: 0.88rem;
      color: var(--text-muted);
      font-weight: 600;
    }
    .footer-nav a:hover {
      color: var(--primary);
    }
    .friend-links-wrap {
      border-top: 1px solid var(--border-color);
      padding-top: 24px;
      margin-bottom: 24px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 16px;
    }
    .friend-links-wrap span {
      font-size: 0.88rem;
      font-weight: 800;
      color: var(--text-dark);
    }
    .friend-links-wrap a {
      font-size: 0.85rem;
      color: var(--text-muted);
      background-color: #f1f5f9;
      padding: 4px 10px;
      border-radius: 4px;
      border: 1px solid var(--border-color);
    }
    .friend-links-wrap a:hover {
      background-color: var(--accent-yellow);
      color: var(--text-dark);
    }
    .footer-bottom {
      border-top: 2px solid var(--text-dark);
      padding-top: 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 0.85rem;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* 悬浮组件 */
    .floating-actions {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 48px;
      height: 48px;
      background-color: #ffffff;
      border: 2px solid var(--text-dark);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 2px 2px 0px var(--text-dark);
      cursor: pointer;
      font-weight: 800;
      font-size: 0.9rem;
      color: var(--text-dark);
      transition: transform 0.2s;
    }
    .float-btn:hover {
      transform: scale(1.1);
      background-color: var(--accent-yellow);
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.1rem;
      }
      .hero-metrics {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .grid-4, .pricing-grid, .testimonial-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .about-grid, .matcher-wrap, .news-grid, .contact-grid, .step-grid, .case-grid {
        grid-template-columns: 1fr;
      }
      .footer-top {
        grid-template-columns: 1fr 1fr;
      }
      .score-number {
        font-size: 1.8rem;
      }
    }

    @media (max-width: 768px) {
      .mobile-menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background-color: #ffffff;
        border-bottom: 2px solid var(--text-dark);
        padding: 16px 20px;
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links li a {
        width: 100%;
        padding: 10px 0;
      }
      .hero-title {
        font-size: 1.7rem;
      }
      .hero-metrics {
        grid-template-columns: 1fr;
      }
      .grid-3, .grid-4, .pricing-grid, .testimonial-grid {
        grid-template-columns: 1fr;
      }
      .review-score-banner {
        flex-direction: column;
        text-align: center;
        gap: 16px;
      }
      .score-badge {
        text-align: center;
      }
      .footer-top {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 10px;
        text-align: center;
      }
    }