/* Shared Button Components - Modern CSS patterns */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    min-height: 2.5rem;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    border: 1px solid transparent;
    background: none;
    cursor: pointer;
    text-decoration: none;
    font-family: inherit;
    transition: all 0.15s ease;
}

.btn:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* Button Variants */
.btn--primary {
    background: var(--color-primary);
    color: var(--color-primary-fg, white);
    border-color: var(--color-primary);
}

.btn--primary:hover:not(:disabled) {
    opacity: 0.9;
}

.btn--secondary {
    background: var(--surface-secondary);
    color: var(--text);
    border-color: var(--border-primary);
}

.btn--secondary:hover:not(:disabled) {
    background: var(--surface-tertiary);
}

.btn--danger {
    background: var(--color-danger);
    color: white;
    border-color: var(--color-danger);
}

.btn--danger:hover:not(:disabled) {
    opacity: 0.9;
}

/* Size Variants */
.btn--sm {
    padding: 0.375rem 0.75rem;
    min-height: 2rem;
    font-size: 0.75rem;
}

.btn--lg {
    padding: 0.75rem 1.5rem;
    min-height: 3rem;
    font-size: 1rem;
}