body {
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    width: 100vw;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    overflow: hidden;
}
canvas {
    border: none;
    cursor: crosshair;
    opacity: 0;
    transition: opacity 0.5s ease;
    box-shadow: 0 10px 40px rgba(0,0,0,0.3);
}
canvas.loaded {
    opacity: 1;
}
#loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
    transition: opacity 0.5s ease;
    flex-direction: column;
}
#loading-screen.hidden {
    opacity: 0;
    pointer-events: none;
}
.loader {
    width: 60px;
    height: 60px;
    border: 8px solid rgba(255, 255, 255, 0.2);
    border-left-color: #ffffff;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}
.loading-text {
    color: white;
    font-family: 'Poppins', sans-serif;
    font-size: 24px;
    margin-top: 20px;
    font-weight: bold;
}