* {
            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: 20px;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
            width: 100%;
            max-width: 600px;
            overflow: hidden;
        }

        .header {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 30px;
            text-align: center;
        }

        .header h1 {
            font-size: 2.5em;
            margin-bottom: 10px;
        }

        .header p {
            opacity: 0.9;
            font-size: 1.1em;
        }

        .stats {
            display: flex;
            justify-content: space-around;
            padding: 20px;
            background: #f8f9fa;
            border-bottom: 2px solid #e9ecef;
        }

        .stat-item {
            text-align: center;
        }

        .stat-number {
            font-size: 2em;
            font-weight: bold;
            color: #667eea;
        }

        .stat-label {
            color: #666;
            font-size: 0.9em;
            margin-top: 5px;
        }

        .add-task-section {
            padding: 30px;
            border-bottom: 2px solid #e9ecef;
        }

        .input-group {
            display: flex;
            gap: 10px;
        }

        .task-input {
            flex: 1;
            padding: 15px;
            border: 2px solid #e0e0e0;
            border-radius: 10px;
            font-size: 1em;
            transition: all 0.3s;
        }

        .task-input:focus {
            outline: none;
            border-color: #667eea;
            box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
        }

        .add-btn {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border: none;
            padding: 15px 30px;
            border-radius: 10px;
            font-size: 1em;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.3s;
        }

        .add-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 25px rgba(102, 126, 234, 0.4);
        }

        .filters {
            display: flex;
            justify-content: center;
            gap: 10px;
            padding: 20px;
            background: #f8f9fa;
        }

        .filter-btn {
            padding: 10px 20px;
            border: 2px solid #667eea;
            background: white;
            color: #667eea;
            border-radius: 20px;
            cursor: pointer;
            font-weight: bold;
            transition: all 0.3s;
        }

        .filter-btn:hover {
            background: #667eea;
            color: white;
        }

        .filter-btn.active {
            background: #667eea;
            color: white;
        }

        .tasks-section {
            padding: 30px;
            max-height: 500px;
            overflow-y: auto;
        }

        .task-item {
            display: flex;
            align-items: center;
            gap: 15px;
            padding: 15px;
            background: #f8f9fa;
            border-radius: 10px;
            margin-bottom: 10px;
            transition: all 0.3s;
            animation: slideIn 0.3s ease;
        }

        @keyframes slideIn {
            from {
                opacity: 0;
                transform: translateX(-20px);
            }
            to {
                opacity: 1;
                transform: translateX(0);
            }
        }

        .task-item:hover {
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
            transform: translateX(5px);
        }

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

        .checkbox {
            width: 24px;
            height: 24px;
            cursor: pointer;
            accent-color: #667eea;
        }

        .task-text {
            flex: 1;
            font-size: 1.1em;
            color: #333;
        }

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

        .task-time {
            font-size: 0.85em;
            color: #999;
        }

        .delete-btn {
            background: #ff4757;
            color: white;
            border: none;
            padding: 8px 15px;
            border-radius: 8px;
            cursor: pointer;
            font-weight: bold;
            transition: all 0.3s;
        }

        .delete-btn:hover {
            background: #ff3838;
            transform: scale(1.05);
        }

        .empty-state {
            text-align: center;
            padding: 60px 20px;
            color: #999;
        }

        .empty-state-icon {
            font-size: 5em;
            margin-bottom: 20px;
        }

        .empty-state h3 {
            color: #666;
            margin-bottom: 10px;
        }

        .clear-completed {
            text-align: center;
            padding: 20px;
            border-top: 2px solid #e9ecef;
        }

        .clear-btn {
            background: #ff4757;
            color: white;
            border: none;
            padding: 12px 25px;
            border-radius: 10px;
            cursor: pointer;
            font-weight: bold;
            transition: all 0.3s;
        }

        .clear-btn:hover {
            background: #ff3838;
            transform: translateY(-2px);
        }

        @media (max-width: 600px) {
            .header h1 {
                font-size: 2em;
            }

            .input-group {
                flex-direction: column;
            }

            .filters {
                flex-wrap: wrap;
            }

            .stats {
                flex-direction: column;
                gap: 15px;
            }
        }