.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    padding: 0.55rem 1.2rem;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-family: var(--font);
    font-weight: 500;
    cursor: pointer;
    transition: background var(--transition), opacity var(--transition), border-color var(--transition), color var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
}
.btn-primary:hover:not(:disabled) {
    background: var(--color-primary-h);
}

.btn-ghost {
    background: transparent;
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
}
.btn-ghost:hover:not(:disabled) {
    color: var(--color-text);
    border-color: var(--color-text-muted);
    background: var(--color-surface-2);
}

.btn-danger {
    background: transparent;
    color: var(--color-danger);
    border: 1px solid transparent;
}
.btn-danger:hover:not(:disabled) {
    background: rgba(224, 123, 90, 0.12);
    border-color: var(--color-danger);
}

.btn-full { width: 100%; }
.btn-sm   { padding: 0.28rem 0.65rem; font-size: 0.8rem; }