body {
    margin: 0;
    height: 100vh;
    background: radial-gradient(circle at center, #0a1a2f, #02050a);
    overflow: hidden;
    font-family: sans-serif;
    color: white;
}

/* center logo */
.center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    cursor: pointer;
    z-index: 10;
}

.logo360 {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: linear-gradient(135deg, #00cfff, #0077ff);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    font-weight: bold;
    box-shadow: 0 0 30px #00cfff;
    transition: 0.4s;
}

.logo360:hover {
    transform: scale(1.1);
}

.title {
    margin-top: 10px;
}

/* menu container */
.menu {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0);
    transition: 0.5s ease;
	ransform-origin: center center;
}

.menu.active {
    transform: translate(-50%, -50%) scale(1);
}

/* items */
.item {
    position: absolute;
	top: 0;
    left: 0;
    width: 80px;
    height: 80px;
    background: rgba(0, 200, 255, 0.15);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(6px);
    cursor: pointer;
    text-align: center;
    font-size: 12px;
    transition: 0.3s;
}

.item:hover {
    background: #00cfff;
    color: black;
    transform: scale(1.2);
}
#preview3d {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0);
    
    width: 260px;
    height: 260px;

    z-index: 15;
    pointer-events: none;

    transition: 0.4s ease;
}

/* khi hiện */
#preview3d.active {
    transform: translate(-50%, -50%) scale(1);
}

/* làm mờ logo khi preview */
.center.dim {
    opacity: 0.3;
    transition: 0.3s;
}
/* mobile */
@media (max-width: 768px) {
    .item {
        width: 55px;
        height: 55px;
        font-size: 10px;
    }

    .logo360 {
        width: 90px;
        height: 90px;
        font-size: 22px;
    }
}