/* ── Glass menu panel (#menu / #mainMenu) ─────────────────────────── */
#menu {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: min(92vw, 400px);
    max-height: 92vh;
    overflow-y: auto;
    padding: 30px 24px;
    border-radius: 30px;
    text-align: center;
    z-index: 100;
    box-sizing: border-box;
    display: none;
    flex-direction: column;
    justify-content: center;
    background: var(--glass);
    border: 1px solid var(--stroke);
    backdrop-filter: blur(24px) saturate(140%);
    -webkit-backdrop-filter: blur(24px) saturate(140%);
    box-shadow: 0 26px 70px rgba(0,0,0,0.6), inset 0 1px 0 rgba(255,255,255,0.10);
    animation: cardRise 0.5s var(--ease-out) both;
}

#mainMenu {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 14px;
}
#mainMenu .brand {
    font-family: 'Orbitron', sans-serif;
    font-weight: 900;
    font-size: 26px;
    letter-spacing: 1px;
    margin: 2px 0 12px;
    background: linear-gradient(90deg, var(--neon-violet), var(--neon-cyan));
    -webkit-background-clip: text; background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 0 16px rgba(124,58,237,0.4));
}

/* Join-room group: input + button stacked in a sub-card */
.join-room {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 14px;
    border-radius: 18px;
    background: rgba(0,0,0,0.22);
    border: 1px solid var(--stroke-soft);
}
.menu-divider {
    display: flex; align-items: center; gap: 12px;
    color: var(--text-muted); font-size: 12px; font-weight: 600;
    letter-spacing: 1.5px; text-transform: uppercase;
    margin: 4px 0;
}
.menu-divider::before, .menu-divider::after {
    content: ''; flex: 1; height: 1px;
    background: linear-gradient(90deg, transparent, var(--stroke), transparent);
}