/* テニスボールログインアニメーション */
.tennis-ball-login {
    position: fixed;
    z-index: 10000;
    pointer-events: none;
    border-radius: 50%;
    background: radial-gradient(circle at 35% 35%, #d4e84a, #9acd32);
    box-shadow: inset -4px -4px 10px rgba(0,0,0,0.25);
    /* left: -200px; ← 削除 */
    /* bottom: -200px; ← 削除 */
    /* width: 200px; ← 削除 */
    /* height: 200px; ← 削除 */
}


.tennis-ball-login.animating {
    animation: bounceToBall 7s linear forwards;
}

.logo {
    position: relative;
}

.tennis-ball-logo {
    position: absolute;
    left: 2px;
    top: 50%;
    transform: translateY(-50%);
    width: 35px;
    height: 35px;
    border-radius: 50%;
    background: 
        radial-gradient(circle at 25% 25%, rgba(255,255,255,0.3), transparent 50%),
        radial-gradient(circle at 30% 30%, #dff542, #c8e030 40%, #9acd32 70%, #7ba428);
    box-shadow: 
        inset -3px -3px 8px rgba(0,0,0,0.3),
        inset 2px 2px 6px rgba(255,255,255,0.2),
        0 4px 12px rgba(0,0,0,0.3);
    pointer-events: none;
}

@media (max-width: 768px) {
    .tennis-ball-logo {
        width: 20px;
        height: 20px;
        left: 4px;
        box-shadow: 
            inset -2px -2px 5px rgba(0,0,0,0.3),
            inset 1px 1px 4px rgba(255,255,255,0.2),
            0 2px 8px rgba(0,0,0,0.3);
    }
}