/*
 * Button Component
 * Primary interactive element
 */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    font-family: var(--font-family-sans);
    font-size: 0.875rem;
    font-weight: 500;
    line-height: 1;
    border-radius: var(--border-radius);
    border: 1px solid transparent;
    cursor: pointer;
    transition:
        opacity var(--transition-speed),
        transform var(--transition-speed),
        box-shadow var(--transition-speed);
    white-space: nowrap;
    user-select: none;
    position: relative;
    overflow: hidden;
}

/* Button Variants */
.btn-primary {
    background-color: var(--theme-accent);
    color: var(--theme-accent-contrast);
    border-color: var(--theme-accent);
}

.btn-primary:hover {
    opacity: 0.9;
}

.btn-primary:active {
    opacity: 0.8;
}

.btn-secondary {
    background-color: var(--theme-secondary);
    color: var(--theme-secondary-contrast);
    border-color: var(--theme-secondary);
}

.btn-secondary:hover {
    opacity: 0.9;
}

.btn-ghost {
    background-color: transparent;
    color: var(--theme-text-primary);
    border-color: transparent;
}

.btn-ghost:hover {
    background-color: rgba(128, 128, 128, 0.1);
}

[data-theme="dark"] .btn-ghost:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.btn-outline {
    background-color: transparent;
    color: var(--theme-accent);
    border-color: var(--theme-accent);
}

.btn-outline:hover {
    background-color: var(--theme-accent);
    color: var(--theme-accent-contrast);
}

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

.btn-danger:hover {
    opacity: 0.9;
}

/* Button Sizes */
.btn-small {
    padding: 0.375rem 0.75rem;
    font-size: 0.75rem;
}

.btn-large {
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
}

.btn-icon-only {
    padding: 0.625rem;
    min-width: 2.5rem;
}

/* Button States */
.btn:disabled,
.btn.disabled {
    opacity: var(--alpha-disabled);
    cursor: not-allowed;
    pointer-events: none;
}

.btn.loading {
    color: transparent;
}

.btn.loading::after {
    content: "";
    position: absolute;
    width: 1rem;
    height: 1rem;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Button Group */
.btn-group {
    display: inline-flex;
    border-radius: var(--border-radius);
    overflow: hidden;
}

.btn-group .btn {
    border-radius: 0;
    margin-right: -1px;
}

.btn-group .btn:first-child {
    border-top-left-radius: var(--border-radius);
    border-bottom-left-radius: var(--border-radius);
}

.btn-group .btn:last-child {
    border-top-right-radius: var(--border-radius);
    border-bottom-right-radius: var(--border-radius);
    margin-right: 0;
}