:root { 
    --bg-color: #ffffff; 
    --panel-bg: rgba(240, 240, 240, 0.95); 
    --text-color: #333;
    --border-color: #ccc;
    --accent: #0078D7;
}
body { margin: 0; overflow: hidden; background-color: var(--bg-color); font-family: 'Segoe UI', sans-serif; user-select: none; -webkit-user-select: none; }

canvas { display: block; touch-action: none; position: absolute; top: 0; left: 0; z-index: 1; cursor: crosshair;}

.panel { background: var(--panel-bg); padding: 12px; border-radius: 4px; color: var(--text-color); position: absolute; pointer-events: auto; box-shadow: 2px 2px 10px rgba(0,0,0,0.1); z-index: 10; border: 1px solid var(--border-color); display: flex; flex-direction: column; gap: 8px; }
.ui-left { top: 10px; left: 10px; width: 220px; max-width: calc(100vw - 40px); }

.row { display: flex; gap: 6px; align-items: center; justify-content: space-between; }
.mode-toggles { display: flex; gap: 5px; width: 100%; }
.tool-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4px; width: 100%; }

button { 
    flex: 1; padding: 6px 4px; cursor: pointer; background: #fff; 
    color: var(--text-color); border: 1px solid var(--border-color); 
    border-radius: 4px; transition: 0.1s; font-weight: 600; font-size: 10px; 
    text-transform: uppercase; white-space: nowrap; 
    -webkit-tap-highlight-color: transparent; 
    appearance: none; -webkit-appearance: none;
}
button:active { background: #e5e5e5; transform: scale(0.97); }

.active-mode { background: var(--accent) !important; color: #fff !important; border-color: var(--accent) !important; }
.active-tool { background: #e0f0ff; border-color: var(--accent); color: #000; box-shadow: none; }

input[type="color"] { width: 30px; height: 30px; padding: 0; border: 1px solid #aaa; border-radius: 4px; cursor: pointer;}
input[type="color"]::-webkit-color-swatch-wrapper { padding: 0; }
input[type="color"]::-webkit-color-swatch { border: none; border-radius: 3px; }

.range-wrapper { flex: 1; display: flex; flex-direction: column; gap: 2px; }
.range-wrapper label { font-size: 10px; color: #666; font-weight: bold; margin-bottom: 2px; }

input[type="range"] { width: 100%; margin: 0; cursor: pointer; accent-color: var(--accent); }

.hint-text { font-size: 10px; color: #888; text-align: center; margin-top: 5px; font-weight: bold;}

.mobile-only-btn { display: none; }

.mobile-menu-btn { 
    display: none; position: absolute; z-index: 20; background: var(--panel-bg); 
    border: 1px solid #aaa; width: 46px; height: 46px; border-radius: 50%; 
    font-size: 20px; cursor: pointer; padding: 0; align-items: center; justify-content: center; 
    -webkit-tap-highlight-color: transparent;
    box-shadow: 0 4px 6px rgba(0,0,0,0.3), 0 1px 3px rgba(0,0,0,0.2);
    transition: all 0.15s ease;
}
.mobile-menu-btn.pressed {
    box-shadow: inset 0 4px 6px rgba(0,0,0,0.4);
    transform: translateY(2px);
    background: #e0e0e0;
}

@media (max-width: 768px) {
    .mobile-menu-btn { display: flex; top: auto; bottom: 15px; right: 15px; }
    .ui-left { display: none; top: auto; bottom: 75px; right: 15px; left: auto; }
    .ui-left.show { display: flex; }
    .mobile-only-btn { display: block; }
    
    #downloadBtn { order: 10; }
    #statusText { order: 11; }
}