* {
            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: 800px;
            margin: 0 auto;
            background: white;
            border-radius: 20px;
            box-shadow: 0 20px 40px rgba(0,0,0,0.1);
            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;
            text-shadow: 0 2px 4px rgba(0,0,0,0.2);
        }

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

        .add-task-section {
            padding: 30px;
            background: #f8f9ff;
            border-bottom: 1px solid #e0e6ed;
        }

        .input-group {
            display: flex;
            flex-direction: column;
            gap: 15px;
            margin-bottom: 20px;
        }

        .input-row {
            display: flex;
            gap: 15px;
            flex-wrap: wrap;
        }

        input[type="text"], input[type="datetime-local"], select {
            padding: 12px;
            border: 2px solid #e0e6ed;
            border-radius: 10px;
            font-size: 16px;
            transition: all 0.3s ease;
            flex: 1;
            min-width: 200px;
        }

        input[type="text"]:focus, input[type="datetime-local"]:focus, select:focus {
            outline: none;
            border-color: #4facfe;
            box-shadow: 0 0 0 3px rgba(79, 172, 254, 0.1);
        }

        .add-btn {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            border: none;
            padding: 12px 30px;
            border-radius: 10px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            min-width: 120px;
        }

        .add-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
        }

        .tasks-section {
            padding: 30px;
        }

        .filter-tabs {
            display: flex;
            gap: 10px;
            margin-bottom: 25px;
            flex-wrap: wrap;
        }

        .tab {
            padding: 10px 20px;
            background: #e0e6ed;
            border: none;
            border-radius: 25px;
            cursor: pointer;
            transition: all 0.3s ease;
            font-weight: 500;
        }

        .tab.active {
            background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
            color: white;
        }

        .task-item {
            background: white;
            border: 2px solid #e0e6ed;
            border-radius: 15px;
            padding: 20px;
            margin-bottom: 15px;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        .task-item:hover {
            border-color: #4facfe;
            box-shadow: 0 5px 15px rgba(0,0,0,0.1);
        }

        .task-item.completed {
            background: #f0f9ff;
            border-color: #22c55e;
        }

        .task-item.completed .task-text {
            text-decoration: line-through;
            opacity: 0.7;
        }

        .task-header {
            display: flex;
            justify-content: between;
            align-items: flex-start;
            margin-bottom: 10px;
            flex-wrap: wrap;
            gap: 10px;
        }

        .task-text {
            font-size: 1.1em;
            font-weight: 600;
            color: #333;
            flex: 1;
            margin-right: 15px;
        }

        .task-priority {
            padding: 5px 12px;
            border-radius: 20px;
            font-size: 0.8em;
            font-weight: 600;
            text-transform: uppercase;
        }

        .priority-high {
            background: #fee2e2;
            color: #dc2626;
        }

        .priority-medium {
            background: #fef3c7;
            color: #d97706;
        }

        .priority-low {
            background: #dcfce7;
            color: #16a34a;
        }

        .task-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-top: 15px;
            flex-wrap: wrap;
            gap: 10px;
        }

        .task-datetime {
            color: #666;
            font-size: 0.9em;
            background: #f3f4f6;
            padding: 5px 10px;
            border-radius: 10px;
        }

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

        .action-btn {
            padding: 8px 16px;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            font-size: 14px;
            font-weight: 500;
            transition: all 0.3s ease;
        }

        .complete-btn {
            background: #22c55e;
            color: white;
        }

        .complete-btn:hover {
            background: #16a34a;
        }

        .edit-btn {
            background: #f59e0b;
            color: white;
        }

        .edit-btn:hover {
            background: #d97706;
        }

        .delete-btn {
            background: #ef4444;
            color: white;
        }

        .delete-btn:hover {
            background: #dc2626;
        }

        .uncomplete-btn {
            background: #6b7280;
            color: white;
        }

        .uncomplete-btn:hover {
            background: #4b5563;
        }

        .empty-state {
            text-align: center;
            padding: 50px 20px;
            color: #666;
        }

        .empty-state h3 {
            font-size: 1.5em;
            margin-bottom: 10px;
        }

        .stats {
            display: flex;
            justify-content: space-around;
            background: #f8f9ff;
            padding: 20px;
            margin-bottom: 20px;
            border-radius: 15px;
            flex-wrap: wrap;
            gap: 20px;
        }

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

        .stat-number {
            font-size: 2em;
            font-weight: bold;
            color: #4facfe;
        }

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

        @media (max-width: 768px) {
            .input-row {
                flex-direction: column;
            }

            input[type="text"], input[type="datetime-local"], select {
                min-width: auto;
            }

            .task-header {
                flex-direction: column;
                align-items: flex-start;
            }

            .task-actions {
                width: 100%;
                justify-content: flex-end;
            }

            .stats {
                flex-direction: column;
                gap: 10px;
            }
        }

        .edit-form {
            background: #f8f9ff;
            padding: 15px;
            border-radius: 10px;
            margin-top: 15px;
            display: none;
        }

        .edit-form.active {
            display: block;
        }

        .edit-form input, .edit-form select {
            margin-bottom: 10px;
        }

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

        .save-btn {
            background: #22c55e;
            color: white;
        }

        .save-btn:hover {
            background: #16a34a;
        }

        .cancel-btn {
            background: #6b7280;
            color: white;
        }

        .cancel-btn:hover {
            background: #4b5563;
        }