.glass-panel {
    background: rgba(255, 255, 255, 0.4);
    backdrop-filter: blur(20px) saturate(160%); -webkit-backdrop-filter: blur(20px) saturate(160%);
    border: 1px solid rgba(255, 255, 255, 0.45);
    box-shadow: 0 20px 40px rgba(0,0,0,0.04), inset 0 1px 0 rgba(255,255,255,0.6);
    transition: background 0.15s ease, border-color 0.15s ease;
}