* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
    touch-action: none;
}

/* Prevent unwanted touch behaviors */
html, body {
    overscroll-behavior: none;
    position: fixed;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

:root {
    --primary-color: #2196f3;
    --secondary-color: #f5f5f5;
    --border-color: #e0e0e0;
    --toolbar-height: 60px;
    --layers-panel-width: 250px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: #333;
    overscroll-behavior: none;
}

.app-container {
    height: 100vh;
    display: flex;
    flex-direction: column;
}

.toolbar {
    height: auto;
    min-height: var(--toolbar-height);
    background-color: white;
    border-bottom: 1px solid var(--border-color);
    padding: 10px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    flex-wrap: wrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.tool-group {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    padding: 5px;
    border-right: 1px solid var(--border-color);
}

.tool-group:last-child {
    border-right: none;
}

.tool-group.text-command {
    flex: 1;
    border-right: none;
}

#text-command {
    flex: 1;
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 14px;
}

#execute-command {
    padding: 8px 16px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.2s;
}

#execute-command:hover {
    background: #1976d2;
}

.tool-btn {
    padding: 12px 16px;
    min-width: 44px;
    min-height: 44px;
    border: 1px solid var(--border-color);
    background: white;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    touch-action: manipulation;
}

.tool-btn:hover {
    background: var(--secondary-color);
}

.tool-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.main-content {
    flex: 1;
    display: flex;
    overflow: hidden;
    position: relative;
}

.canvas-container {
    flex: 1;
    background: #f0f0f0;
    position: relative;
    overflow: auto;
    -webkit-overflow-scrolling: touch;
}

#main-canvas {
    background: white;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    touch-action: none;
}

.layers-panel {
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    width: var(--layers-panel-width);
    background: white;
    border-left: 1px solid var(--border-color);
    padding: 16px;
    transform: translateX(100%);
    transition: transform 0.3s ease;
    z-index: 1000;
}

.layers-panel.show {
    transform: translateX(0);
}

#layers-toggle {
    position: absolute;
    right: 10px;
    top: 10px;
    z-index: 1001;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    min-width: 44px;
    min-height: 44px;
}

/* Mobile styles */
@media (max-width: 768px) {
    .toolbar {
        padding: 5px;
        gap: 5px;
    }

    .tool-group {
        padding: 0 5px;
    }

    .tool-btn {
        padding: 10px;
        font-size: 14px;
    }

    select, input[type="number"] {
        min-height: 44px;
        font-size: 16px;
    }

    input[type="color"] {
        width: 44px;
        height: 44px;
    }
}

/* Prevent scrolling on mobile when touching canvas */
@media (hover: none) and (pointer: coarse) {
    .canvas-container {
        overflow: hidden;
    }
}

.layers-panel h3 {
    margin-bottom: 16px;
    font-size: 16px;
    color: #444;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

#layers-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

input[type="color"] {
    width: 44px;
    height: 44px;
    padding: 0;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
}

select, input[type="number"] {
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: white;
    min-height: 44px;
    font-size: 16px;
}

#export-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.2s;
    min-width: 44px;
    min-height: 44px;
}

#export-btn:hover {
    background: #1976d2;
}

@media (max-width: 768px) {
    .toolbar {
        padding: 5px;
    }
    
    .tool-group {
        padding: 2px;
        gap: 4px;
    }
    
    select, input[type="number"] {
        max-width: 100px;
    }
}

@media (max-width: 480px) {
    .tool-group {
        flex: 1 1 100%;
        justify-content: center;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }
    
    .tool-group:last-child {
        border-bottom: none;
    }
}