* {
            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;
            flex-direction: column;
            align-items: center;
            padding: 20px;
        }

        h1 {
            color: white;
            margin-bottom: 20px;
            text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
        }

        .container {
            background: white;
            border-radius: 20px;
            box-shadow: 0 20px 60px rgba(0,0,0,0.3);
            padding: 20px;
            width: 100%;
            max-width: 900px;
        }

        .toolbar {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            padding: 20px;
            background: #f8f9fa;
            border-radius: 15px;
            margin-bottom: 20px;
            align-items: center;
        }

        .tool-group {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .tool-group label {
            font-weight: 600;
            color: #333;
        }

        .color-picker {
            width: 50px;
            height: 50px;
            border: 3px solid #fff;
            border-radius: 10px;
            cursor: pointer;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }

        .size-slider {
            width: 150px;
        }

        .tool-btn {
            padding: 10px 20px;
            background: #667eea;
            color: white;
            border: none;
            border-radius: 8px;
            cursor: pointer;
            font-size: 14px;
            font-weight: 600;
            transition: all 0.3s;
        }

        .tool-btn:hover {
            background: #5568d3;
            transform: translateY(-2px);
        }

        .tool-btn.danger {
            background: #ff4757;
        }

        .tool-btn.danger:hover {
            background: #ff3838;
        }

        .tool-btn.active {
            background: #2ecc71;
        }

        .preset-colors {
            display: flex;
            gap: 8px;
        }

        .preset-color {
            width: 35px;
            height: 35px;
            border-radius: 8px;
            cursor: pointer;
            border: 3px solid transparent;
            transition: all 0.3s;
        }

        .preset-color:hover {
            transform: scale(1.1);
        }

        .preset-color.active {
            border-color: #333;
        }

        .canvas-container {
            position: relative;
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 5px 20px rgba(0,0,0,0.1);
            background: white;
        }

        #drawingCanvas {
            display: block;
            cursor: crosshair;
            background: white;
        }

        .size-display {
            background: #667eea;
            color: white;
            padding: 5px 15px;
            border-radius: 20px;
            font-size: 14px;
            font-weight: 600;
        }

        @media (max-width: 768px) {
            .toolbar {
                justify-content: center;
            }

            .size-slider {
                width: 100px;
            }
        }