body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #020208;
    background-image: 
        linear-gradient(rgba(0, 255, 255, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 255, 255, 0.05) 1px, transparent 1px);
    background-size: 20px 20px;
    font-family: 'Courier New', monospace;
    color: #fff;
    user-select: none;
    -webkit-user-select: none;
}

#app-container {
    width: 100vw;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

canvas {
    display: block;
}

.portal-link {
    position: absolute;
    top: 20px;
    left: 20px;
    color: #0ff;
    text-decoration: none;
    font-size: 16px;
    border: 1px solid #0ff;
    padding: 8px 16px;
    border-radius: 4px;
    background: rgba(0, 255, 255, 0.1);
    transition: all 0.3s;
    text-shadow: 0 0 5px #0ff;
    box-shadow: 0 0 5px #0ff;
    z-index: 10;
}

.portal-link:hover {
    background: rgba(0, 255, 255, 0.3);
    box-shadow: 0 0 15px #0ff;
}

.sound-toggle {
    position: absolute;
    bottom: 20px;
    right: 20px;
    background: transparent;
    color: #555;
    border: 1px solid #555;
    padding: 8px 16px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s;
    outline: none;
    z-index: 10;
}

.sound-toggle:hover {
    border-color: #888;
    color: #888;
}

.sound-toggle.on {
    color: #0f0;
    border-color: #0f0;
    text-shadow: 0 0 5px #0f0;
    box-shadow: 0 0 5px #0f0;
    background: rgba(0, 255, 0, 0.1);
}