.btn {
    border: none;
    border-radius: var(--btn-border-radius, 0.25rem);
    padding: 0.5rem 1.25rem;
    font-size: 1rem;
    font-weight: 500;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: background 0.25s cubic-bezier(.4, 0, .2, 1), box-shadow 0.25s cubic-bezier(.4, 0, .2, 1);
    cursor: pointer;
    align-items: center;
    gap: 5px;
    display: flex;
}

/* Primary */
.btn-primary {
    background: var(--btn-primary-bg, #2563eb);
    color: var(--btn-primary-text, #fff);
}

.btn-primary:hover:not(:disabled),
.btn-primary:focus-visible:not(:disabled) {
    background: var(--btn-primary-bg-hover, #1b4fd7);
    box-shadow: 0 0 16px 4px rgba(37, 99, 235, 0.25);
}

/* Secondary */
.btn-secondary {
    background: var(--btn-secondary-bg, #6b7280);
    color: var(--btn-secondary-text, #fff);
}

.btn-secondary:hover:not(:disabled),
.btn-secondary:focus-visible:not(:disabled) {
    background: var(--btn-secondary-bg-hover, #52525b);
    box-shadow: 0 0 16px 4px rgba(107, 114, 128, 0.18);
}

/* Info */
.btn-info {
    background: var(--btn-info-bg, #0ea5e9);
    color: var(--btn-info-text, #fff);
}

.btn-info:hover:not(:disabled),
.btn-info:focus-visible:not(:disabled) {
    background: var(--btn-info-bg-hover, #0369a1);
    box-shadow: 0 0 16px 4px rgba(14, 165, 233, 0.18);
}

/* Danger */
.btn-danger {
    background: var(--btn-danger-bg, #dc2626);
    color: var(--btn-danger-text, #fff);
}

.btn-danger:hover:not(:disabled),
.btn-danger:focus-visible:not(:disabled) {
    background: var(--btn-danger-bg-hover, #b91c1c);
    box-shadow: 0 0 16px 4px rgba(220, 38, 38, 0.18);
}

/* Warning */
.btn-warning {
    background: var(--btn-warning-bg, #f59e42);
    color: var(--btn-warning-text, #fff);
}

.btn-warning:hover:not(:disabled),
.btn-warning:focus-visible:not(:disabled) {
    background: var(--btn-warning-bg-hover, #d97706);
    box-shadow: 0 0 16px 4px rgba(245, 158, 66, 0.18);
}

/* Success */
.btn-success {
    background-color: var(--btn-valoriza-bg, #22c55e);
    color: var(--btn-valoriza-text, #fff);
}

.btn-success:hover:not(:disabled),
.btn-success:focus-visible:not(:disabled) {
    background-color: var(--btn-valoriza-bg-hover, #16a34a);
    box-shadow: 0 0 16px 4px rgba(34, 197, 94, 0.22);
}

/* Transparent */
.btn-transparent {
    color: var(--btn-transparent-text, #fff);
    border: 1px solid var(--btn-transparent-border, #A0A0A0FF);
}

.btn-transparent:hover:not(:disabled),
.btn-transparent:focus-visible:not(:disabled) {
    background: var(--btn-transparent-bg-hover, #A0A0A0FF);
    box-shadow: 0 0 16px 4px rgba(107, 114, 128, 0.18);
}

/* Estados y tamaños */
.btn:disabled,
.btn[disabled] {
    opacity: 0.7;
    cursor: not-allowed;
    box-shadow: none;
}

.btn-sm {
    padding: 0.25rem 0.75rem;
    font-size: 0.875rem;
    height: 40px;
}

.btn-md {
    /* default */
}

.btn-lg {
    padding: 0.75rem 1.75rem;
    font-size: 1.125rem;
}

.btn-xl {
    padding: 1rem 2.25rem;
    font-size: 1.25rem;
}