.theme-physics { background: linear-gradient(180deg, #e3f2fd 0%, #bbdefb 50%, #81c784 100%); }
.theme-physics .game-header h1 { color: #1565c0; }

#physics-canvas {
    display: block; margin: 10px auto; background: linear-gradient(180deg, #87ceeb 0%, #87ceeb 70%, #8bc34a 70%);
    border-radius: 16px; box-shadow: 0 6px 25px rgba(0,0,0,0.1);
    max-width: 95%;
}
.controls-panel {
    display: flex; gap: 15px; align-items: center; justify-content: center;
    flex-wrap: wrap; margin: 12px auto; max-width: 450px; padding: 0 15px;
}
.ctrl-group {
    flex: 1; min-width: 120px; text-align: center;
}
.ctrl-group label {
    display: block; font-size: 0.95rem; font-weight: 700; color: #333;
    font-family: 'Nunito', sans-serif; margin-bottom: 5px;
}
.ctrl-group input[type="range"] {
    width: 100%; accent-color: #1565c0;
}
.btn-fire {
    padding: 14px 30px; border: none; border-radius: 99px;
    background: linear-gradient(135deg, #ff5722, #f44336); color: white;
    font-size: 1.3rem; font-family: 'Baloo 2', cursive; cursor: pointer;
    box-shadow: 0 5px 0 #c62828; transition: all 0.15s; min-width: 120px;
}
.btn-fire:active { transform: translateY(5px); box-shadow: 0 0 0; }
.btn-fire:disabled { background: #bdbdbd; box-shadow: 0 4px 0 #9e9e9e; cursor: not-allowed; }

@media (max-width: 450px) {
    .controls-panel { gap: 10px; }
    .btn-fire { font-size: 1.1rem; padding: 12px 24px; }
}