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

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            padding: 20px;
        }

        .container {
            background: white;
            border-radius: 10px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
            padding: 30px;
            width: 100%;
            max-width: 500px;
        }

        h1 {
            color: #333;
            margin-bottom: 30px;
            text-align: center;
        }

        .input-container {
            display: flex;
            gap: 10px;
            margin-bottom: 20px;
        }

        #taskInput {
            flex: 1;
            padding: 12px;
            border: 2px solid #ddd;
            border-radius: 5px;
            font-size: 16px;
            transition: border-color 0.3s;
        }

        #taskInput:focus {
            outline: none;
            border-color: #667eea;
        }

        #addBtn {
            padding: 12px 25px;
            background-color: #667eea;
            color: white;
            border: none;
            border-radius: 5px;
            font-size: 16px;
            cursor: pointer;
            font-weight: bold;
            transition: background-color 0.3s;
        }

        #addBtn:hover {
            background-color: #5568d3;
        }

        #taskList {
            list-style: none;
        }

        .task-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 15px;
            background: #f5f5f5;
            margin-bottom: 10px;
            border-radius: 5px;
            transition: all 0.3s;
        }

        .task-item:hover {
            background: #efefef;
            transform: translateX(5px);
        }

        .task-item.completed {
            opacity: 0.6;
        }

        .task-item.completed .task-text {
            text-decoration: line-through;
            color: #999;
        }

        .task-checkbox {
            width: 20px;
            height: 20px;
            cursor: pointer;
            accent-color: #667eea;
        }

        .task-text {
            flex: 1;
            color: #333;
            font-size: 16px;
            word-break: break-word;
        }

        .delete-btn {
            padding: 6px 12px;
            background-color: #ff6b6b;
            color: white;
            border: none;
            border-radius: 3px;
            cursor: pointer;
            font-weight: bold;
            transition: background-color 0.3s;
        }

        .delete-btn:hover {
            background-color: #ff5252;
        }

        .empty-message {
            text-align: center;
            color: #999;
            padding: 20px;
            font-size: 16px;
        }

        .stats {
            margin-top: 20px;
            padding: 15px;
            background: #f5f5f5;
            border-radius: 5px;
            text-align: center;
            color: #666;
            font-size: 14px;
        }