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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            background-color: #f9fafb;
            color: #1f2937;
            line-height: 1.5;
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Header */
        .blog-header {
            background: linear-gradient(135deg, #2c5aa0 0%, #1a3a6e 100%);
            color: white;
            padding: 60px 0;
            text-align: center;
            margin-bottom: 48px;
        }

        .blog-header h1 {
            font-size: 2.8rem;
            margin-bottom: 12px;
        }

        .blog-header p {
            font-size: 1.2rem;
            opacity: 0.9;
            max-width: 700px;
            margin: 0 auto;
        }

        /* Layout */
        .blog-layout {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 48px;
            margin-bottom: 60px;
        }

        @media (max-width: 768px) {
            .blog-layout {
                grid-template-columns: 1fr;
                gap: 32px;
            }
        }

        /* Main content - article grid */
        .articles-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
            gap: 30px;
        }

        .article-card {
            background: white;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 4px 12px rgba(0,0,0,0.05);
            transition: transform 0.2s, box-shadow 0.2s;
        }

        .article-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 24px rgba(0,0,0,0.1);
        }

        .card-image {
            width: 100%;
            height: 200px;
            object-fit: cover;
            background-color: #e5e7eb;
        }

        .card-content {
            padding: 20px;
        }

        .card-category {
            font-size: 0.75rem;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: #2c5aa0;
            font-weight: 600;
            margin-bottom: 8px;
        }

        .card-title {
            font-size: 1.35rem;
            font-weight: 700;
            margin-bottom: 12px;
            line-height: 1.3;
        }

        .card-title a {
            color: #1f2937;
            text-decoration: none;
        }

        .card-title a:hover {
            color: #2c5aa0;
        }

        .card-excerpt {
            color: #4b5563;
            font-size: 0.9rem;
            margin-bottom: 16px;
        }

        .card-meta {
            font-size: 0.8rem;
            color: #6b7280;
            display: flex;
            gap: 16px;
            border-top: 1px solid #e5e7eb;
            padding-top: 12px;
        }

        /* Sidebar */
        .sidebar {
            background: white;
            border-radius: 16px;
            padding: 24px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.05);
            height: fit-content;
        }

        .sidebar-widget {
            margin-bottom: 32px;
        }

        .sidebar-widget h3 {
            font-size: 1.2rem;
            margin-bottom: 16px;
            padding-bottom: 8px;
            border-bottom: 2px solid #e5e7eb;
            color: #2c5aa0;
        }

        .recent-posts-list, .category-list {
            list-style: none;
        }

        .recent-posts-list li, .category-list li {
            margin-bottom: 12px;
        }

        .recent-posts-list a, .category-list a {
            text-decoration: none;
            color: #4b5563;
            transition: color 0.2s;
        }

        .recent-posts-list a:hover, .category-list a:hover {
            color: #2c5aa0;
        }

        .category-list li span {
            float: right;
            color: #9ca3af;
            font-size: 0.8rem;
        }

        .cta-box {
            background: #f3f4f6;
            border-radius: 12px;
            padding: 20px;
            text-align: center;
            margin-top: 16px;
        }

        .cta-box h4 {
            margin-bottom: 12px;
            color: #1f2937;
        }

        .cta-button {
            display: inline-block;
            background: #2c5aa0;
            color: white;
            padding: 10px 20px;
            border-radius: 30px;
            text-decoration: none;
            font-weight: 600;
            margin-top: 12px;
            transition: background 0.2s;
        }

        .cta-button:hover {
            background: #1a3a6e;
        }

        /* Category filter tabs */
        .category-tabs {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-bottom: 32px;
            border-bottom: 1px solid #e5e7eb;
            padding-bottom: 16px;
        }

        .tab-btn {
            background: none;
            border: none;
            padding: 8px 20px;
            font-size: 0.9rem;
            font-weight: 500;
            cursor: pointer;
            border-radius: 40px;
            transition: all 0.2s;
            color: #4b5563;
        }

        .tab-btn.active {
            background: #2c5aa0;
            color: white;
        }

        .tab-btn:hover:not(.active) {
            background: #e5e7eb;
        }

        /* Footer */
        .blog-footer {
            background: #1f2937;
            color: #9ca3af;
            text-align: center;
            padding: 32px 0;
            margin-top: 48px;
        }

        @media (max-width: 640px) {
            .blog-header h1 { font-size: 2rem; }
            .articles-grid { grid-template-columns: 1fr; }
        }