* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: sans-serif;
    background: #ffffff;
    color: #000000;
    padding: 16px;
    max-width: 800px;
    margin: 0 auto;
}

header {
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid #000000;
}

h1 {
    font-size: 1.2rem;
    font-weight: bold;
}

.toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 12px;
}

button {
    background: #ffffff;
    border: 1px solid #000000;
    padding: 6px 12px;
    font-size: 0.85rem;
    cursor: pointer;
    color: #000000;
}

button:hover {
    background: #eeeeee;
}

button.active {
    background: #000000;
    color: #ffffff;
}

.canvas-container {
    position: relative;
    width: 100%;
    border: 1px solid #000000;
    margin-bottom: 12px;
    background: #ffffff;
}

canvas {
    display: block;
    width: 100%;
    height: auto;
}

canvas.draw-mode {
    cursor: crosshair;
}

#overlayCanvas {
    position: absolute;
    top: 0;
    left: 0;
    pointer-events: none;
}

.controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 12px;
    border: 1px solid #000000;
    padding: 12px;
}

.control-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-size: 0.85rem;
}

label {
    font-weight: bold;
}

input[type=range], select {
    width: 100%;
}

select {
    padding: 4px;
    border: 1px solid #000000;
    background: #ffffff;
}

.hidden {
    display: none;
}