/* 移动端方向按钮面板 - 置于右下角 */
.mobile-controls {
    position: fixed;
    bottom: 20px;
    right: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 100;
    background: rgba(30,30,40,0.65);
    backdrop-filter: blur(8px);
    border-radius: 60px;
    padding: 12px;
    border: 1px solid rgba(255,215,170,0.3);
    pointer-events: auto;
}
.row {
    display: flex;
    justify-content: center;
    gap: 15px;
}
.ctrl-btn {
    width: 55px;
    height: 55px;
    background: rgba(20,20,30,0.75);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffefcf;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    user-select: none;
    transition: 0.05s linear;
    border: 1px solid rgba(255,200,120,0.6);
    box-shadow: 0 2px 6px rgba(0,0,0,0.3);
    font-family: monospace;
}
.ctrl-btn:active {
    background: #ccaa77;
    color: #2a2418;
    transform: scale(0.96);
}
@media (min-width: 800px) {
    .mobile-controls { display: none; }
}