* {
            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;
            padding: 20px;
        }

        .container {
            max-width: 600px;
            margin: 0 auto;
            background: white;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.2);
            overflow: hidden;
        }

        .header {
            background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
            padding: 30px;
            text-align: center;
            color: white;
        }

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

        .task-stats {
            display: flex;
            justify-content: space-around;
            margin-top: 20px;
            background: rgba(255,255,255,0.2);
            padding: 15px;
            border-radius: 10px;
        }

        .stat {
            text-align: center;
        }

        .stat-number {
            font-size: 1.5em;
            font-weight: bold;
        }

        .main-content {
            padding: 30px;
        }

        .input-section {
            display: flex;
            gap: 10px;
            margin-bottom: 30px;
        }

        .task-input {
            flex: 1;
            padding: 15px;
            border: 2px solid #e1e8ed;
            border-radius: 10px;
            font-size: 16px;
            transition: border-color 0.3s ease;
        }

        .task-input:focus {
            outline: none;
            border-color: #4facfe;
        }

        .add-btn {
            padding: 15px 25px;
            background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
            color: white;
            border: none;
            border-radius: 10px;
            cursor: pointer;
            font-size: 16px;
            font-weight: bold;
            transition: transform 0.2s ease;
        }

        .add-btn:hover {
            transform: translateY(-2px);
        }

        .add-btn:disabled {
            opacity: 0.6;
            cursor: not-allowed;
            transform: none;
        }

        .filter-section {
            display: flex;
            justify-content: center;
            gap: 10px;
            margin-bottom: 20px;
        }

        .filter-btn {
            padding: 8px 16px;
            border: 2px solid #e1e8ed;
            background: white;
            border-radius: 20px;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .filter-btn.active {
            background: #4facfe;
            color: white;
            border-color: #4facfe;
        }

        .task-list {
            list-style: none;
        }

        .task-item {
            background: #f8f9fa;
            margin-bottom: 15px;
            padding: 20px;
            border-radius: 10px;
            border-left: 4px solid #4facfe;
            transition: all 0.3s ease;
            animation: slideIn 0.3s ease;
        }

        @keyframes slideIn {
            from {
                opacity: 0;
                transform: translateY(-10px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        .task-item:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }

        .task-item.completed {
            opacity: 0.7;
            border-left-color: #28a745;
        }

        .task-content {
            display: flex;
            align-items: center;
            gap: 15px;
        }

        .task-checkbox {
            width: 20px;
            height: 20px;
            cursor: pointer;
        }

        .task-text {
            flex: 1;
            font-size: 16px;
            transition: all 0.3s ease;
        }

        .task-text.completed {
            text-decoration: line-through;
            color: #6c757d;
        }

        .task-input-edit {
            flex: 1;
            padding: 8px 12px;
            border: 2px solid #4facfe;
            border-radius: 5px;
            font-size: 16px;
        }

        .task-actions {
            display: flex;
            gap: 10px;
        }

        .btn {
            padding: 8px 12px;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            font-size: 14px;
            transition: all 0.3s ease;
        }

        .edit-btn {
            background: #ffc107;
            color: white;
        }

        .edit-btn:hover {
            background: #ffb300;
        }

        .delete-btn {
            background: #dc3545;
            color: white;
        }

        .delete-btn:hover {
            background: #c82333;
        }

        .save-btn {
            background: #28a745;
            color: white;
        }

        .save-btn:hover {
            background: #218838;
        }

        .cancel-btn {
            background: #6c757d;
            color: white;
        }

        .cancel-btn:hover {
            background: #5a6268;
        }

        .empty-state {
            text-align: center;
            color: #6c757d;
            font-style: italic;
            padding: 40px 20px;
        }

        .empty-state img {
            width: 100px;
            opacity: 0.3;
            margin-bottom: 20px;
        }