/* Buttons */
.btn {
    padding: 0 var(--space-3);
    height: 36px;
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--radius-sm);
    background-color: var(--btn-bg);
    color: var(--btn-text);
    border: 1px solid var(--border-color);
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-family: inherit;
    gap: var(--space-2);
}

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

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background-color: var(--btn-primary-bg);
    color: var(--btn-primary-text);
    border-color: transparent;
    font-weight: 600;
    box-shadow: var(--btn-primary-shadow);
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--btn-primary-hover);
    box-shadow: var(--btn-primary-shadow-hover);
    transform: translateY(-1px);
}

.btn-accent {
    background-color: var(--btn-primary-bg);
    color: var(--btn-primary-text);
    border-color: transparent;
    font-weight: 600;
    box-shadow: var(--btn-primary-shadow);
}

.btn-accent:hover:not(:disabled) {
    background-color: var(--btn-primary-hover);
    box-shadow: var(--btn-primary-shadow-hover);
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: var(--bg-card);
    color: var(--text-base);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--bg-card-hover);
    border-color: var(--border-highlight);
    color: var(--text-base);
    transform: translateY(-1px);
}

.btn-danger {
    background-color: var(--btn-danger-bg);
    color: var(--btn-danger-text);
    border-color: transparent;
}

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

.btn-small {
    height: 28px;
    padding: 0 var(--space-2);
    font-size: 13px;
}

.btn-active {
    background-color: var(--btn-primary-bg) !important;
    color: #fff !important;
    border-color: transparent !important;
}

.header-actions {
    display: flex;
    gap: var(--space-2);
    align-items: center;
}

.header-divider {
    width: 1px;
    height: 20px;
    background-color: var(--border-color);
    margin: 0 var(--space-1);
}

.lang-selector {
    background-color: var(--bg-body);
    color: var(--text-base);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: var(--space-1) var(--space-4) var(--space-1) var(--space-2);
    font-family: inherit;
    font-size: 13px;
    height: 28px;
    outline: none;
    cursor: pointer;
    transition: border-color var(--transition-fast);
}

.lang-selector:hover,
.lang-selector:focus {
    border-color: var(--text-highlight);
}

/* Tabs */
.editor-tabs {
    display: flex;
    gap: 0;
    height: 100%;
    align-items: flex-end;
}

.tab {
    padding: var(--space-2) var(--space-4);
    background-color: var(--tab-bg);
    color: var(--text-muted);
    font-size: 14px;
    border-radius: 0;
    border-top: 2px solid transparent;
    transition: all var(--transition-fast);
    cursor: pointer;
    outline: none;
    border: none;
    border-right: 1px solid var(--border-color);
}

.tab:hover {
    background-color: var(--tab-hover-bg);
    color: var(--text-base);
}

.tab.active {
    background-color: var(--tab-active-bg);
    border-top: 2px solid var(--tab-border);
    color: var(--text-base);
    font-weight: 500;
}

/* Toggle Switch */
.theme-toggle {
    display: flex;
    align-items: center;
    margin-left: var(--space-3);
}

.switch {
    position: relative;
    display: inline-block;
    width: 36px;
    height: 20px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--border-color);
    transition: .2s ease;
}

.slider:before {
    position: absolute;
    content: "";
    height: 14px;
    width: 14px;
    left: 3px;
    bottom: 3px;
    background-color: var(--text-muted);
    transition: .2s ease;
}

input:checked+.slider {
    background-color: var(--btn-primary-bg);
}

input:checked+.slider:before {
    transform: translateX(16px);
    background-color: #FFFFFF;
}

.slider.round {
    border-radius: var(--radius-lg);
}

.slider.round:before {
    border-radius: 50%;
}

/* Checkbox */
.checkbox-label {
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: var(--space-2);
    cursor: pointer;
    color: var(--text-base);
}

/* Toast Notifications */
.toast {
    position: fixed;
    bottom: var(--space-6);
    left: 50%;
    transform: translateX(-50%) translateY(8px);
    background-color: var(--bg-panel);
    color: var(--text-base);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: var(--space-2) var(--space-4);
    font-size: 13px;
    font-family: var(--font-primary);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 9999;
    opacity: 0;
    transition: opacity 0.2s ease, transform 0.2s ease;
    pointer-events: none;
}

.toast.toast-visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.toast.toast-success {
    border-color: #16A34A;
}

.toast.toast-error {
    border-color: var(--btn-danger-bg);
}

.toast.toast-info {
    border-color: var(--btn-primary-bg);
}

/* Snippets Panel */
.snippets-panel {
    position: fixed;
    width: 280px;
    background-color: var(--bg-panel);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    z-index: 200;
    overflow: hidden;
}

.snippets-panel.hidden {
    display: none;
}

.snippets-header {
    padding: var(--space-2) var(--space-4);
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-header);
}

.snippets-list {
    list-style: none;
    padding: var(--space-2) 0;
    max-height: 320px;
    overflow-y: auto;
}

.snippet-item {
    display: flex;
    flex-direction: column;
    padding: var(--space-2) var(--space-4);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.snippet-item:hover {
    background-color: var(--btn-bg-hover);
}

.snippet-label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-base);
}

.snippet-desc {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 2px;
}

/* Brand Logo Component */
.logo {
    display: inline-flex;
    align-items: center;
    text-decoration: none;
    line-height: 1;
    flex-shrink: 0;
}

.brand-logo {
    height: 52px;
    width: auto;
    max-width: 280px;
    object-fit: contain;
    display: block;
    transition: transform var(--transition-fast);
}

.app-header .brand-logo {
    height: 38px;
    max-width: 200px;
}

.logo:hover .brand-logo {
    transform: scale(1.02);
}

body.theme-dark .brand-logo.logo-light,
body:not(.theme-light) .brand-logo.logo-light {
    display: none !important;
}

body.theme-dark .brand-logo.logo-dark,
body:not(.theme-light) .brand-logo.logo-dark {
    display: block !important;
}

body.theme-light .brand-logo.logo-dark {
    display: none !important;
}

body.theme-light .brand-logo.logo-light {
    display: block !important;
}

@media (max-width: 768px) {
    .brand-logo {
        height: 42px;
        max-width: 210px;
    }
}

/* Typography Gradient Utilities */
.gradient,
.gradient-text {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

.gradient-amber {
    background: var(--gradient-amber);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

.gradient-secondary {
    background: var(--brand-secondary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

/* Accessibility & SEO utility for semantic headings */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}