.back-to-top-btn {
    position: fixed; 
    bottom: 30px; 
    right: 30px;
    width: 50px; 
    height: 50px;
    background-color: #000; 
    color: #fff !important;
    border-radius: 50%; 
    display: flex;
    align-items: center; 
    justify-content: center;
    z-index: 9999; 
    opacity: 0; 
    visibility: hidden; 
    transition: 0.4s;
}
.back-to-top-btn.show { 
    opacity: 1; 
    visibility: visible; 
}

.detail-back-btn {
    border-radius: 0 !important;
    font-size: 0.75rem !important;
    font-weight: 700 !important;
    letter-spacing: 0.15rem;
    padding: 12px 24px !important;
    background-color: white !important;
    color: black !important;
    border: 1px solid #eee !important;
    transition: 0.3s ease;
}
.detail-back-btn:hover {
    background-color: #000 !important;
    color: #fff !important;
    border-color: #000 !important;
}

.form-control-sm {
    min-height: calc(1.5em + 0.5rem + 2px) !important;
    padding: 0.15rem 0.5rem !important;
    font-size: 0.85rem !important;
    line-height: 1.2 !important;
}

.form-label {
    margin-bottom: 0.1rem !important;
}

#signup-alert {
    min-height: 20px;
    font-weight: 600;
    letter-spacing: 0.05rem;
}