/* =====================================================
   Button Component - Refined
   ===================================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    letter-spacing: var(--tracking-normal);
    line-height: 1;
    text-align: center;
    white-space: nowrap;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
    outline: none;
}

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

/* Primary Button */
.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-text-inverse);
}

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

.btn-primary:active:not(:disabled) {
    background-color: var(--color-primary-dark);
}

/* Secondary Button */
.btn-secondary {
    background-color: var(--color-bg);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--color-surface);
    border-color: var(--color-text-muted);
}

/* Ghost Button */
.btn-ghost {
    background-color: transparent;
    color: var(--color-text);
}

.btn-ghost:hover:not(:disabled) {
    background-color: var(--color-surface);
}

/* Link Button */
.btn-link {
    background-color: transparent;
    color: var(--color-primary);
    padding: 0;
}

.btn-link:hover:not(:disabled) {
    text-decoration: underline;
}

/* Danger Button */
.btn-danger {
    background-color: var(--color-error);
    color: var(--color-text-inverse);
}

.btn-danger:hover:not(:disabled) {
    background-color: #DC2626;
}

/* Button Sizes */
.btn-sm {
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-sm);
}

.btn-lg {
    padding: var(--space-4) var(--space-6);
    font-size: var(--text-lg);
}

/* Full Width */
.btn-block {
    width: 100%;
}

/* Disabled State */
.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Loading State */
.btn-loading {
    position: relative;
    pointer-events: none;
}

.btn-loading .btn-text {
    visibility: hidden;
}

.btn-loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: btn-spin 0.6s linear infinite;
}

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

/* Button with Icon */
.btn-icon {
    padding: var(--space-3);
}

.btn-icon.btn-sm {
    padding: var(--space-2);
}

.btn svg,
.btn-icon svg {
    width: 20px;
    height: 20px;
}

.btn-sm svg,
.btn-icon.btn-sm svg {
    width: 16px;
    height: 16px;
}