* {
    box-sizing: border-box;
}

body {
    margin: 0;
    padding: 20px;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    padding: 40px;
    max-width: 600px;
    width: 100%;
}

.header {
    text-align: center;
    margin-bottom: 30px;
}

h1 {
    color: #333;
    margin: 0 0 10px 0;
    font-size: 2.2em;
    font-weight: 600;
}

.subtitle {
    color: #666;
    font-size: 1.05em;
    line-height: 1.6;
}

.canvas-container {
    position: relative;
    width: 100%;
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
}

canvas {
    background: linear-gradient(135deg, #b8b8b8 0%, #8a8a8a 100%);
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    cursor: crosshair;
    display: block;
    max-width: 100%;
    height: auto;
}

.info-panel {
    background: #f8f9fa;
    border-radius: 10px;
    padding: 20px;
    border-left: 4px solid #667eea;
}

.info-panel h3 {
    margin: 0 0 10px 0;
    color: #667eea;
    font-size: 1.1em;
}

.info-panel p {
    margin: 5px 0;
    color: #555;
    line-height: 1.6;
}

.info-panel ul {
    margin: 10px 0;
    padding-left: 20px;
    color: #555;
}

.info-panel li {
    margin: 5px 0;
}

.back-link {
    text-align: center;
    margin-top: 20px;
}

.back-link a {
    color: #667eea;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s;
}

.back-link a:hover {
    color: #764ba2;
}

@media (max-width: 600px) {
    .container {
        padding: 20px;
    }
    
    h1 {
        font-size: 1.8em;
    }
    
    canvas {
        width: 100%;
    }
}