/* Nút tròn */
.support-box-toggle {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: #1bbcdc;
    color: #fff;
    border-radius: 50%;
    width: 65px;
    height: 65px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 3px 12px rgba(0,0,0,0.3);
    font-size: 28px;
    z-index: 9999;
}

/* Hộp hỗ trợ */
.support-box {
    position: fixed;
    bottom: 100px;
    right: 20px;
    background: #1bbcdc;
    color: #fff;
    border-radius: 12px;
    width: 280px;
    padding: 15px;
    display: none;
    z-index: 9999;
    box-shadow: 0 4px 16px rgba(0,0,0,0.25);
    animation: fadeIn 0.3s ease-in-out;
}

.support-box-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: bold;
    margin-bottom: 10px;
    font-size: 16px;
}

.support-box .close-btn {
    background: transparent;
    border: none;
    color: #fff;
    font-size: 20px;
    cursor: pointer;
}

.support-box a {
    display: block;
    background: #fff;
    color: #333;
    text-decoration: none;
    padding: 12px;
    border-radius: 8px;
    margin-bottom: 10px;
    font-weight: bold;
    text-align: left;
}

.support-box a.phone {
    color: #d32f2f;
}

.support-box a.zalo {
    color: #0068ff;
}

/* Hiệu ứng */
@keyframes fadeIn {
    from {opacity: 0; transform: translateY(20px);}
    to {opacity: 1; transform: translateY(0);}
}
