body {
    margin: 0;
    padding: 0;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    font-family: 'Inter', sans-serif;
    background: radial-gradient(circle at 50% 50%, #1a1a2e 0%, #0d0d16 60%, #000000 100%);
    touch-action: none;
    -webkit-user-select: none;
    user-select: none;
    color: white;
}

canvas {
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

#ui-layer {
    z-index: 10;
}

.fade-transition {
    transition: opacity 0.5s ease-in-out, visibility 0.5s ease-in-out;
}

@keyframes tilt {
    0%   { transform: rotate(0deg); }
    50%  { transform: rotate(-90deg); }
    100% { transform: rotate(0deg); }
}
.animate-tilt {
    animation: tilt 2s infinite ease-in-out;
}

.logo-glow {
    filter: brightness(0) invert(1) drop-shadow(0px 0px 15px rgba(255, 255, 255, 0.4));
}
.text-glow {
    filter: drop-shadow(0px 0px 10px rgba(255, 255, 255, 0.4));
}
.btn-glow {
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.3);
}
.btn-glow:hover {
    box-shadow: 0 0 30px rgba(255, 255, 255, 0.6);
}