/* ============================================
   API Tester v2 - Button Styles
   All Button Variants and States
   ============================================ */

/* ========== Base Button ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    height: var(--input-height);
    padding: 0 var(--spacing-4);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    line-height: 1;
    color: var(--color-text-primary);
    background-color: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition:
        color var(--transition-fast),
        background-color var(--transition-fast),
        border-color var(--transition-fast);
    white-space: nowrap;
    text-decoration: none;
    user-select: none;
}

.btn:hover {
    background-color: var(--color-glass-hover);
    border-color: var(--color-border-hover);
}

.btn:active {
    background-color: var(--color-glass-active);
}

.btn:focus-visible {
    outline: none;
    box-shadow: 0 0 0 2px var(--color-text-tertiary);
}

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

.btn svg {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

/* ========== Button Sizes ========== */
.btn-sm {
    height: var(--input-height-sm);
    padding: 0 var(--spacing-3);
    font-size: var(--font-size-xs);
}

.btn-sm svg {
    width: 14px;
    height: 14px;
}

.btn-lg {
    height: var(--input-height-lg);
    padding: 0 var(--spacing-6);
    font-size: var(--font-size-base);
}

.btn-lg svg {
    width: 18px;
    height: 18px;
}

/* ========== Primary Button ========== */
.btn-primary {
    color: var(--color-bg-primary);
    background-color: var(--color-accent);
    border-color: var(--color-accent);
}

.btn-primary:hover {
    color: var(--color-bg-primary);
    background-color: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
}

.btn-primary:active {
    background-color: var(--color-accent-active);
    border-color: var(--color-accent-active);
}

.btn-primary:focus-visible {
    box-shadow: 0 0 0 2px var(--color-text-tertiary);
}

/* ========== Secondary Button ========== */
.btn-secondary {
    color: var(--color-text-primary);
    background-color: var(--color-bg-tertiary);
    border-color: var(--color-border);
}

.btn-secondary:hover {
    background-color: var(--color-glass-hover);
    border-color: var(--color-border-hover);
}

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

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

/* ========== Outline Button ========== */
.btn-outline {
    color: var(--color-accent);
    background-color: transparent;
    border-color: var(--color-accent);
}

.btn-outline:hover {
    color: var(--color-bg-primary);
    background-color: var(--color-accent);
    border-color: var(--color-accent);
}

/* ========== Danger Button ========== */
.btn-danger {
    color: white;
    background-color: var(--color-error);
    border-color: var(--color-error);
}

.btn-danger:hover {
    background-color: #dc2626;
    border-color: #dc2626;
}

.btn-danger:focus-visible {
    box-shadow: 0 0 0 3px var(--color-error-muted);
}

/* ========== Success Button ========== */
.btn-success {
    color: white;
    background-color: var(--color-success);
    border-color: var(--color-success);
}

.btn-success:hover {
    background-color: #16a34a;
    border-color: #16a34a;
}

.btn-success:focus-visible {
    box-shadow: 0 0 0 3px var(--color-success-muted);
}

/* ========== Warning Button ========== */
.btn-warning {
    color: white;
    background-color: var(--color-warning);
    border-color: var(--color-warning);
}

.btn-warning:hover {
    background-color: #d97706;
    border-color: #d97706;
}

.btn-warning:focus-visible {
    box-shadow: 0 0 0 3px var(--color-warning-muted);
}

/* ========== Icon Button ========== */
.btn-icon {
    width: var(--input-height);
    height: var(--input-height);
    padding: 0;
}

.btn-icon.btn-sm {
    width: var(--input-height-sm);
    height: var(--input-height-sm);
}

.btn-icon.btn-lg {
    width: var(--input-height-lg);
    height: var(--input-height-lg);
}

.btn-icon svg {
    width: 18px;
    height: 18px;
}

.btn-icon.btn-sm svg {
    width: 14px;
    height: 14px;
}

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

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

/* ========== Button with Loading State ========== */
.btn-loading {
    position: relative;
    color: transparent !important;
    pointer-events: none;
}

.btn-loading::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: var(--radius-full);
    animation: spin 0.8s linear infinite;
}

.btn-primary.btn-loading::after,
.btn-danger.btn-loading::after,
.btn-success.btn-loading::after,
.btn-warning.btn-loading::after {
    border-color: white;
    border-right-color: transparent;
}

/* ========== Button Group ========== */
.btn-group {
    display: inline-flex;
}

.btn-group .btn {
    border-radius: 0;
}

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

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

.btn-group .btn:not(:last-child) {
    border-right: none;
}

.btn-group .btn:hover {
    z-index: 1;
}

.btn-group .btn.is-active {
    background-color: var(--color-accent);
    border-color: var(--color-accent);
    color: white;
    z-index: 2;
}

/* ========== Generate Button (Special) ========== */
.btn-generate {
    height: 48px;
    padding: 0 var(--spacing-8);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--color-bg-primary);
    background: var(--color-accent);
    border: 1px solid var(--color-accent);
    border-radius: var(--radius-md);
    transition:
        background-color var(--transition-base),
        border-color var(--transition-base);
}

.btn-generate:hover {
    background: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
}

.btn-generate:active {
    background: var(--color-accent-active);
}

.btn-generate:disabled {
    background: var(--color-glass-active);
    box-shadow: none;
}

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

/* ========== Stop Button (Special) ========== */
.btn-stop {
    height: 48px;
    padding: 0 var(--spacing-8);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: white;
    background: var(--color-error);
    border: 1px solid var(--color-error);
    border-radius: var(--radius-md);
}

.btn-stop:hover {
    background: #ff6b63;
    border-color: #ff6b63;
}

/* ========== Theme Toggle Buttons ========== */
.theme-toggle-group {
    display: flex;
    gap: var(--spacing-1);
    padding: var(--spacing-1);
    background-color: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.theme-toggle-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition:
        color var(--transition-fast),
        background-color var(--transition-fast);
}

.theme-toggle-btn:hover {
    color: var(--color-text-primary);
    background-color: var(--color-glass-hover);
}

.theme-toggle-btn.is-active {
    color: var(--color-text-primary);
    background-color: var(--color-accent-muted);
}

.theme-toggle-btn svg {
    width: 16px;
    height: 16px;
}

/* ========== Link Button ========== */
.btn-link {
    height: auto;
    padding: 0;
    color: var(--color-accent);
    background: transparent;
    border: none;
    font-weight: var(--font-weight-normal);
}

.btn-link:hover {
    color: var(--color-accent-hover);
    background: transparent;
    text-decoration: underline;
}

/* ========== Close Button ========== */
.btn-close {
    width: 32px;
    height: 32px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-close:hover {
    color: var(--color-text-primary);
    background-color: var(--color-glass-hover);
}

.btn-close svg {
    width: 18px;
    height: 18px;
}

/* ========== Copy Button ========== */
.btn-copy {
    position: relative;
}

.btn-copy.is-copied {
    color: var(--color-success);
    border-color: var(--color-success);
}

.btn-copy.is-copied::after {
    content: 'Copied!';
    position: absolute;
    top: -30px;
    left: 50%;
    transform: translateX(-50%);
    padding: var(--spacing-1) var(--spacing-2);
    font-size: var(--font-size-xs);
    color: white;
    background-color: var(--color-success);
    border-radius: var(--radius-sm);
    white-space: nowrap;
    animation: fade-in-up var(--transition-fast) ease-out;
}

@keyframes fade-in-up {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(4px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

/* ========== Floating Action Button ========== */
.btn-fab {
    position: fixed;
    bottom: var(--spacing-6);
    right: var(--spacing-6);
    width: 56px;
    height: 56px;
    padding: 0;
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-lg);
    z-index: var(--z-fixed);
}

.btn-fab svg {
    width: 24px;
    height: 24px;
}

.btn-fab:hover {
    background-color: var(--color-glass-hover);
}

/* ========== Responsive ========== */
@media (max-width: 480px) {
    .btn {
        padding: 0 var(--spacing-3);
    }

    .btn-lg {
        height: var(--input-height);
        padding: 0 var(--spacing-4);
        font-size: var(--font-size-sm);
    }

    .btn-generate {
        height: 44px;
        padding: 0 var(--spacing-6);
    }

    .theme-toggle-group {
        gap: 0;
    }

    .theme-toggle-btn {
        width: 30px;
        height: 30px;
    }
}