* {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            font-family: 'Segoe UI', Arial, sans-serif;
        }

        body {
            background: linear-gradient(135deg, #1a2a6c, #b21f1f, #fdbb2d);
            min-height: 100vh;
            padding: 40px 20px;
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        .container {
            max-width: 1200px;
            width: 100%;
        }

        .header {
            text-align: center;
            margin-bottom: 40px;
            color: white;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
        }

        .header h1 {
            font-size: 3rem;
            margin-bottom: 10px;
            letter-spacing: 2px;
        }

        .header p {
            font-size: 1.2rem;
            opacity: 0.9;
        }

        .cards-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 25px;
        }

        .card {
            background: rgba(255, 255, 255, 0.95);
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            display: flex;
            flex-direction: column;
            height: 400px;
        }

        .card:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
        }

        .card-header {
            padding: 25px 25px 15px;
            border-bottom: 1px solid #eee;
            /* background-color: #9b59b6; */
        }

        .card-title {
            font-size: 1.8rem;
            font-weight: 800;
            margin-bottom: 5px;
            letter-spacing: 1px;
        }

        .card-subtitle {
            font-size: 1rem;
            color: #666;
            font-weight: 500;
        }

        .card-content {
            padding: 20px 25px;
            flex-grow: 1;
            overflow: auto;
            line-height: 1.6;
            /* background-color: #444444; */
        }

        .card-content p {
            margin-bottom: 15px;
            color: #444;
        }

        /* สีเฉพาะสำหรับการ์ดแต่ละใบ */
        .card:nth-child(1) {
            border-top: 5px solid #3498db;
        }
        .card:nth-child(1) .card-title {
            color: #3498db;
        }

        .card:nth-child(2) {
            border-top: 5px solid #e74c3c;
        }
        .card:nth-child(2) .card-title {
            color: #e74c3c;
        }

        .card:nth-child(3) {
            border-top: 5px solid #2ecc71;
        }
        .card:nth-child(3) .card-title {
            color: #2ecc71;
        }

        .card:nth-child(4) {
            border-top: 5px solid #f39c12;
        }
        .card:nth-child(4) .card-title {
            color: #f39c12;
        }

        .card:nth-child(5) {
            border-top: 5px solid #9b59b6;
        }
        .card:nth-child(5) .card-title {
            color: #9b59b6;
        }

        .card:nth-child(6) {
            border-top: 5px solid #1abc9c;
        }
        .card:nth-child(6) .card-title {
            color: #1abc9c;
        }

        /* Responsive Design */
        @media (max-width: 992px) {
            .cards-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 576px) {
            .cards-grid {
                grid-template-columns: 1fr;
            }
            
            .header h1 {
                font-size: 2.2rem;
            }
            
            .card {
                height: 350px;
            }
        }