body {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    user-select: none;
}
.auth-container {
    background: #fff;
    border-radius: 18px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.12);
    width: 100%;
    max-width: 420px;
    padding: 2.5rem 2rem 2rem 2rem;
}
.nav-tabs {
    border: none;
    margin-bottom: 2rem;
}
.nav-tabs .nav-link {
    border: none;
    color: #6c757d;
    font-weight: 500;
    padding: 1rem 2rem;
    border-radius: 0;
    transition: color 0.2s;
}
.nav-tabs .nav-link.active {
    color: #0d6efd;
    border-bottom: 3px solid #0d6efd;
    background: none;
}
.nav-tabs .nav-link:focus {
    outline: none;
}
.form-control {
    border-radius: 10px;
    padding: 0.8rem 1rem;
    border: 1px solid #dee2e6;
    font-size: 1rem;
}
.form-control:focus {
    box-shadow: 0 0 0 0.15rem rgba(13,110,253,0.15);
    border-color: #86b7fe;
}
.input-group-text {
    background: #f8f9fa;
    border-right: none;
    border-radius: 10px 0 0 10px;
}
.input-group .form-control {
    border-left: none;
    border-radius: 0 10px 10px 0;
}
.btn-primary {
    border-radius: 10px;
    padding: 0.8rem 2rem;
    font-weight: 500;
    background: linear-gradient(135deg, #0d6efd 0%, #0a58ca 100%);
    border: none;
    width: 100%;
    margin-top: 1rem;
    font-size: 1.1rem;
}
.btn-primary:hover {
    background: linear-gradient(135deg, #0a58ca 0%, #084298 100%);
}
.form-label {
    font-weight: 500;
    color: #495057;
}
@media (max-width: 600px) {
    .auth-container {
        padding: 1.2rem 0.5rem 1.5rem 0.5rem;
        max-width: 98vw;
    }
    .nav-tabs .nav-link {
        padding: 0.7rem 0.5rem;
        font-size: 0.98rem;
    }
}