:root {
            --primary: #6366f1; /* 靛蓝 */
            --primary-glow: rgba(99, 102, 241, 0.15);
            --accent: #f43f5e; /* 艳粉/玫瑰红 */
            --accent-glow: rgba(244, 63, 94, 0.15);
            --cyan: #06b6d4; /* 霓虹青 */
            --dark: #0f172a; /* 极深灰蓝 */
            --light-bg: #f8fafc; /* 浅底 */
            --card-bg: #ffffff;
            --text-main: #1e293b;
            --text-muted: #64748b;
            --border: #e2e8f0;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        html {
            scroll-behavior: smooth;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: var(--light-bg);
            color: var(--text-main);
            line-height: 1.6;
        }

        body {
            overflow-x: hidden;
        }

        /* 统一页面容器 */
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* 撞色艳色风格按钮 */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            font-size: 1rem;
            font-weight: 600;
            border-radius: 8px;
            text-decoration: none;
            transition: var(--transition);
            cursor: pointer;
            border: none;
            outline: none;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary) 0%, var(--cyan) 100%);
            color: #ffffff;
            box-shadow: 0 4px 14px var(--primary-glow);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(6, 182, 212, 0.4);
        }

        .btn-accent {
            background: linear-gradient(135deg, var(--accent) 0%, #f97316 100%);
            color: #ffffff;
            box-shadow: 0 4px 14px var(--accent-glow);
        }

        .btn-accent:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(244, 63, 94, 0.4);
        }

        .btn-outline {
            background: transparent;
            border: 2px solid var(--primary);
            color: var(--primary);
        }

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

        /* 顶部导航 */
        header {
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        .nav-wrapper {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 70px;
        }

        .logo-area {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .ai-page-logo {
            height: 40px;
            width: auto;
        }

        .logo-text {
            font-size: 1.25rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        nav {
            display: flex;
            align-items: center;
            gap: 20px;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 20px;
            list-style: none;
        }

        .nav-links a {
            color: var(--text-main);
            text-decoration: none;
            font-size: 0.95rem;
            font-weight: 500;
            transition: var(--transition);
        }

        .nav-links a:hover {
            color: var(--accent);
        }

        .menu-toggle {
            display: none;
            flex-direction: column;
            gap: 6px;
            background: none;
            border: none;
            cursor: pointer;
        }

        .menu-toggle span {
            display: block;
            width: 25px;
            height: 3px;
            background-color: var(--dark);
            border-radius: 3px;
            transition: var(--transition);
        }

        /* Hero首屏 - 严禁出现图片 */
        .hero {
            position: relative;
            background: radial-gradient(circle at 10% 20%, rgba(99, 102, 241, 0.05) 0%, rgba(6, 182, 212, 0.05) 90.1%);
            padding: 100px 0 80px 0;
            overflow: hidden;
            border-bottom: 1px solid var(--border);
        }

        .hero::before {
            content: '';
            position: absolute;
            top: -20%;
            right: -10%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, var(--primary-glow) 0%, transparent 70%);
            z-index: 1;
        }

        .hero::after {
            content: '';
            position: absolute;
            bottom: -10%;
            left: -10%;
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
            z-index: 1;
        }

        .hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 900px;
            margin: 0 auto;
        }

        .badge-hero {
            display: inline-block;
            background: linear-gradient(90deg, var(--accent) 0%, var(--primary) 100%);
            color: #ffffff;
            padding: 6px 16px;
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 700;
            margin-bottom: 24px;
            letter-spacing: 1px;
            text-transform: uppercase;
        }

        h1 {
            font-size: 2.8rem;
            font-weight: 800;
            line-height: 1.25;
            color: var(--dark);
            margin-bottom: 20px;
        }

        h1 span {
            background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero-desc {
            font-size: 1.15rem;
            color: var(--text-muted);
            margin-bottom: 40px;
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }

        .hero-actions {
            display: flex;
            justify-content: center;
            gap: 20px;
            flex-wrap: wrap;
        }

        /* 标签云组件 */
        .tag-cloud-wrap {
            margin-top: 50px;
        }
        .tag-cloud-title {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 15px;
            text-transform: uppercase;
            letter-spacing: 1px;
        }
        .tag-cloud {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 10px;
            max-width: 800px;
            margin: 0 auto;
        }
        .tag-item {
            background: #ffffff;
            border: 1px solid var(--border);
            padding: 6px 14px;
            border-radius: 50px;
            font-size: 0.85rem;
            color: var(--text-main);
            transition: var(--transition);
        }
        .tag-item:hover {
            border-color: var(--accent);
            color: var(--accent);
            transform: scale(1.05);
        }

        /* 主体分段公用样式 */
        section {
            padding: 80px 0;
            border-bottom: 1px solid var(--border);
        }

        .section-header {
            text-align: center;
            margin-bottom: 50px;
        }

        .section-header h2 {
            font-size: 2.2rem;
            color: var(--dark);
            margin-bottom: 15px;
            position: relative;
            display: inline-block;
        }

        .section-header h2::after {
            content: '';
            position: absolute;
            bottom: -8px;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--accent));
            border-radius: 2px;
        }

        .section-header p {
            color: var(--text-muted);
            font-size: 1rem;
            max-width: 600px;
            margin: 0 auto;
        }

        /* 数据指标卡片 */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin-top: -40px;
            position: relative;
            z-index: 10;
        }

        .stat-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 30px 20px;
            text-align: center;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.03);
            transition: var(--transition);
        }

        .stat-card:hover {
            transform: translateY(-5px);
            border-color: var(--primary);
            box-shadow: 0 15px 30px var(--primary-glow);
        }

        .stat-num {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 10px;
            background: linear-gradient(135deg, var(--primary) 0%, var(--cyan) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .stat-label {
            font-size: 0.95rem;
            color: var(--text-main);
            font-weight: 600;
        }

        /* 平台介绍栏目 */
        .about-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }

        .about-text h3 {
            font-size: 1.8rem;
            color: var(--dark);
            margin-bottom: 20px;
        }

        .about-text p {
            color: var(--text-muted);
            margin-bottom: 20px;
            font-size: 1.05rem;
        }

        .about-features {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }

        .about-feat-item {
            background: var(--card-bg);
            border-left: 4px solid var(--accent);
            padding: 15px;
            border-radius: 4px 8px 8px 4px;
            box-shadow: 0 2px 10px rgba(0,0,0,0.02);
        }

        .about-feat-item h4 {
            font-size: 1rem;
            margin-bottom: 5px;
            color: var(--dark);
        }

        .about-feat-item p {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin: 0;
        }

        /* 服务能力卡片 */
        .services-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
        }

        .service-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 35px 25px;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }

        .service-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: linear-gradient(90deg, var(--primary), var(--cyan));
            transform: scaleX(0);
            transform-origin: left;
            transition: var(--transition);
        }

        .service-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.05);
            border-color: var(--primary);
        }

        .service-card:hover::before {
            transform: scaleX(1);
        }

        .service-icon {
            font-size: 2.5rem;
            margin-bottom: 20px;
            display: inline-block;
        }

        .service-card h3 {
            font-size: 1.35rem;
            margin-bottom: 15px;
            color: var(--dark);
        }

        .service-card p {
            color: var(--text-muted);
            font-size: 0.95rem;
            margin-bottom: 20px;
        }

        .service-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .service-tag {
            background: var(--light-bg);
            padding: 4px 10px;
            border-radius: 4px;
            font-size: 0.75rem;
            color: var(--primary);
            font-weight: 600;
        }

        /* 流程步骤 */
        .flow-timeline {
            position: relative;
            max-width: 900px;
            margin: 0 auto;
        }

        .flow-timeline::before {
            content: '';
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            top: 0;
            bottom: 0;
            width: 4px;
            background: var(--border);
        }

        .flow-step {
            position: relative;
            margin-bottom: 60px;
            width: 50%;
            padding-right: 40px;
            text-align: right;
        }

        .flow-step:nth-child(even) {
            margin-left: 50%;
            padding-right: 0;
            padding-left: 40px;
            text-align: left;
        }

        .flow-step::after {
            content: '';
            position: absolute;
            right: -10px;
            top: 0;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: var(--accent);
            border: 4px solid #ffffff;
            box-shadow: 0 0 0 4px var(--accent-glow);
            z-index: 2;
        }

        .flow-step:nth-child(even)::after {
            right: auto;
            left: -10px;
        }

        .flow-step-num {
            font-size: 3rem;
            font-weight: 800;
            color: rgba(99, 102, 241, 0.15);
            line-height: 1;
            margin-bottom: 5px;
        }

        .flow-step h3 {
            font-size: 1.25rem;
            color: var(--dark);
            margin-bottom: 10px;
        }

        .flow-step p {
            color: var(--text-muted);
            font-size: 0.95rem;
        }

        /* 对比表格区域 */
        .table-responsive {
            width: 100%;
            overflow-x: auto;
            border-radius: 12px;
            border: 1px solid var(--border);
            background: var(--card-bg);
            box-shadow: 0 10px 30px rgba(0,0,0,0.02);
        }

        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            min-width: 800px;
        }

        .comparison-table th, .comparison-table td {
            padding: 20px 24px;
            border-bottom: 1px solid var(--border);
        }

        .comparison-table th {
            background-color: var(--light-bg);
            font-weight: 700;
            color: var(--dark);
        }

        .comparison-table tr:last-child td {
            border-bottom: none;
        }

        .comparison-table td strong {
            color: var(--accent);
        }

        .badge-score {
            display: inline-flex;
            align-items: center;
            gap: 5px;
            background: #fff1f2;
            color: var(--accent);
            padding: 4px 10px;
            border-radius: 4px;
            font-weight: 700;
            font-size: 0.9rem;
        }

        /* FAQ 折叠面板 */
        .faq-accordion {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 15px;
        }

        .faq-item {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: 8px;
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-question {
            padding: 20px;
            width: 100%;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: none;
            border: none;
            text-align: left;
            font-size: 1.05rem;
            font-weight: 600;
            color: var(--dark);
            cursor: pointer;
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
            background-color: var(--light-bg);
        }

        .faq-answer-inner {
            padding: 20px;
            color: var(--text-muted);
            border-top: 1px solid var(--border);
            font-size: 0.95rem;
        }

        .faq-icon {
            font-size: 1.2rem;
            transition: transform 0.3s ease;
            color: var(--primary);
        }

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

        .faq-item.active .faq-answer {
            max-height: 500px; /* 足够容纳展开高度 */
        }

        /* 客户评论卡片 */
        .comments-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .comment-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 30px;
            box-shadow: 0 5px 20px rgba(0,0,0,0.02);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .comment-text {
            font-size: 0.95rem;
            color: var(--text-main);
            margin-bottom: 20px;
            font-style: italic;
        }

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

        .comment-avatar {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary) 0%, var(--cyan) 100%);
            color: #ffffff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1.1rem;
        }

        .comment-info h4 {
            font-size: 0.95rem;
            color: var(--dark);
        }

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

        /* 案例展示区 */
        .case-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .case-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: 12px;
            overflow: hidden;
            transition: var(--transition);
        }

        .case-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.05);
            border-color: var(--accent);
        }

        .case-img-container {
            width: 100%;
            background: var(--light-bg);
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
            border-bottom: 1px solid var(--border);
        }

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

        .case-content {
            padding: 20px;
        }

        .case-content h3 {
            font-size: 1.15rem;
            margin-bottom: 10px;
            color: var(--dark);
        }

        .case-content p {
            font-size: 0.9rem;
            color: var(--text-muted);
        }

        /* 文章列表 */
        .articles-list {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 20px;
        }

        .article-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: 8px;
            padding: 25px;
            transition: var(--transition);
        }

        .article-card:hover {
            border-color: var(--primary);
            box-shadow: 0 5px 15px var(--primary-glow);
        }

        .article-card h3 {
            font-size: 1.1rem;
            margin-bottom: 10px;
            line-height: 1.4;
        }

        .article-card h3 a {
            color: var(--dark);
            text-decoration: none;
            transition: var(--transition);
        }

        .article-card h3 a:hover {
            color: var(--primary);
        }

        .article-meta {
            font-size: 0.8rem;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 15px;
        }

        /* 需求评估表单及联系我们 */
        .contact-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 50px;
        }

        .contact-form-wrap {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 40px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.02);
        }

        .form-title {
            font-size: 1.5rem;
            color: var(--dark);
            margin-bottom: 30px;
            font-weight: 700;
        }

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

        .form-label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--text-main);
        }

        .form-control {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border);
            border-radius: 6px;
            background-color: var(--light-bg);
            font-size: 0.95rem;
            color: var(--dark);
            transition: var(--transition);
        }

        .form-control:focus {
            outline: none;
            border-color: var(--primary);
            background-color: #ffffff;
            box-shadow: 0 0 0 3px var(--primary-glow);
        }

        .contact-info-wrap {
            display: flex;
            flex-direction: column;
            gap: 30px;
        }

        .info-card {
            background: var(--card-bg);
            border-left: 4px solid var(--primary);
            border-top: 1px solid var(--border);
            border-right: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
            border-radius: 0 8px 8px 0;
            padding: 24px;
        }

        .info-card h4 {
            font-size: 1.1rem;
            color: var(--dark);
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .info-card p {
            font-size: 0.95rem;
            color: var(--text-muted);
        }

        .info-card a {
            color: var(--primary);
            text-decoration: none;
        }

        .qr-area {
            display: flex;
            align-items: center;
            gap: 20px;
            background: var(--card-bg);
            border: 1px solid var(--border);
            padding: 20px;
            border-radius: 8px;
        }

        .qr-image {
            width: 100px;
            height: 100px;
            object-fit: cover;
            border: 1px solid var(--border);
            border-radius: 4px;
        }

        .qr-text h5 {
            font-size: 0.95rem;
            color: var(--dark);
            margin-bottom: 5px;
        }

        .qr-text p {
            font-size: 0.8rem;
            color: var(--text-muted);
            line-height: 1.4;
        }

        /* 侧边悬停及返回顶部 */
        .fixed-action {
            position: fixed;
            right: 20px;
            bottom: 30px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .action-btn {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: #ffffff;
            border: 1px solid var(--border);
            box-shadow: 0 4px 10px rgba(0,0,0,0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: var(--transition);
            position: relative;
        }

        .action-btn:hover {
            background: var(--primary);
            color: #ffffff;
            transform: scale(1.1);
        }

        .action-btn svg {
            width: 24px;
            height: 24px;
            fill: currentColor;
        }

        /* 悬浮框二维码展示 */
        .action-btn .popover {
            position: absolute;
            right: 60px;
            bottom: 0;
            background: #ffffff;
            border: 1px solid var(--border);
            padding: 15px;
            border-radius: 8px;
            box-shadow: 0 4px 15px rgba(0,0,0,0.15);
            display: none;
            text-align: center;
            width: 150px;
        }

        .action-btn:hover .popover {
            display: block;
        }

        .popover img {
            width: 120px;
            height: 120px;
            margin-bottom: 5px;
        }

        .popover span {
            font-size: 0.75rem;
            color: var(--dark);
            display: block;
        }

        /* 页脚区 */
        footer {
            background-color: var(--dark);
            color: #94a3b8;
            padding: 60px 0 30px 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr repeat(3, 1fr);
            gap: 40px;
            border-bottom: 1px solid #334155;
            padding-bottom: 40px;
            margin-bottom: 30px;
        }

        .footer-about h3 {
            color: #ffffff;
            margin-bottom: 15px;
            font-size: 1.25rem;
        }

        .footer-about p {
            font-size: 0.9rem;
            line-height: 1.6;
        }

        .footer-nav h4 {
            color: #ffffff;
            margin-bottom: 15px;
            font-size: 1rem;
        }

        .footer-nav ul {
            list-style: none;
        }

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

        .footer-nav ul li a {
            color: #94a3b8;
            text-decoration: none;
            font-size: 0.9rem;
            transition: var(--transition);
        }

        .footer-nav ul li a:hover {
            color: var(--accent);
            padding-left: 5px;
        }

        .friend-links-area {
            border-bottom: 1px solid #334155;
            padding-bottom: 20px;
            margin-bottom: 20px;
        }

        .friend-links-area h5 {
            color: #ffffff;
            margin-bottom: 10px;
            font-size: 0.9rem;
        }

        .friend-links-area a {
            color: #94a3b8;
            text-decoration: none;
            margin-right: 15px;
            font-size: 0.85rem;
            display: inline-block;
            transition: var(--transition);
        }

        .friend-links-area a:hover {
            color: var(--cyan);
        }

        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 0.8rem;
            flex-wrap: wrap;
            gap: 15px;
        }

        .footer-bottom p {
            margin: 0;
        }

        /* 响应式调整 */
        @media (max-width: 1024px) {
            h1 { font-size: 2.2rem; }
            .stats-grid { grid-template-columns: repeat(2, 1fr); margin-top: 20px; }
            .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 40px; }
            .comments-grid, .case-grid { grid-template-columns: 1fr 1fr; }
        }

        @media (max-width: 768px) {
            header { padding: 10px 0; }
            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: 70px;
                left: 0;
                width: 100%;
                background: #ffffff;
                border-bottom: 1px solid var(--border);
                padding: 20px;
                gap: 15px;
                box-shadow: 0 10px 15px rgba(0,0,0,0.05);
            }
            .nav-links.active {
                display: flex;
            }
            .menu-toggle {
                display: flex;
            }
            .hero { padding: 60px 0; }
            h1 { font-size: 1.8rem; }
            .hero-desc { font-size: 1rem; }
            .flow-timeline::before { left: 20px; }
            .flow-step { width: 100%; padding-right: 0; padding-left: 45px; text-align: left; }
            .flow-step:nth-child(even) { margin-left: 0; padding-left: 45px; }
            .flow-step::after, .flow-step:nth-child(even)::after { left: 10px; right: auto; }
            .comments-grid, .case-grid { grid-template-columns: 1fr; }
            .stats-grid { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; gap: 30px; }
        }