/* Botones y Spinner de carga */
.btn-submit {
    width: 100%;
    height: 48px;
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    border: none;
    border-radius: var(--radius-md);
    color: #ffffff;
    font-size: 14.5px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    box-shadow: 0 4px 14px var(--primary-glow);
    transition: all 0.2s ease;
}

.btn-submit:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.35);
}

.btn-submit:active {
    transform: translateY(0);
}

.btn-submit:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.spinner {
    display: none;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: #ffffff;
    animation: spin 0.8s linear infinite;
}

.btn-submit.loading .spinner {
    display: inline-block;
}

.btn-submit.loading .btn-icon {
    display: none;
}