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

        body {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 40px 20px;
            color: #333;
        }

        header {
            text-align: center;
            margin-bottom: 40px;
            color: white;
        }

        h1 {
            font-size: 2.5rem;
            margin-bottom: 10px;
            font-weight: 700;
        }

        p {
            font-size: 1.1rem;
            opacity: 0.9;
        }

        .container {
            display: flex;
            gap: 30px;
            flex-wrap: wrap;
            justify-content: center;
            max-width: 1200px;
            width: 100%;
        }

        .column {
            flex: 1;
            min-width: 300px;
            background: rgba(255, 255, 255, 0.9);
            border-radius: 16px;
            padding: 20px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
            backdrop-filter: blur(10px);
            display: flex;
            flex-direction: column;
            min-height: 500px;
        }

        .column-title {
            font-size: 1.5rem;
            font-weight: 600;
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 2px solid rgba(0, 0, 0, 0.1);
            text-align: center;
            color: #4a5568;
        }

        .task-list {
            flex: 1;
            min-height: 100px;
            padding: 15px;
            border-radius: 12px;
            background: rgba(255, 255, 255, 0.6);
            transition: background-color 0.2s;
        }

        .task {
            background: white;
            padding: 15px;
            margin-bottom: 15px;
            border-radius: 12px;
            box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
            cursor: grab;
            transition: transform 0.2s, box-shadow 0.2s;
            border-left: 4px solid #667eea;
        }

        .task:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 14px rgba(0, 0, 0, 0.12);
        }

        .task:active {
            cursor: grabbing;
        }

        .task.dragging {
            opacity: 0.6;
            transform: scale(0.98);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
        }

        .task-title {
            font-weight: 600;
            margin-bottom: 8px;
            color: #2d3748;
        }

        .task-desc {
            font-size: 0.9rem;
            color: #718096;
        }

        .drag-over {
            background: rgba(102, 126, 234, 0.2);
            border: 2px dashed #667eea;
        }

        .success-message {
            position: fixed;
            bottom: 20px;
            left: 50%;
            transform: translateX(-50%);
            background: #48bb78;
            color: white;
            padding: 12px 24px;
            border-radius: 8px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
            opacity: 0;
            transition: opacity 0.3s;
        }

        .success-message.show {
            opacity: 1;
        }

        @media (max-width: 768px) {
            .container {
                flex-direction: column;
            }
            
            .column {
                min-width: 100%;
            }
        }