/* LaTeX Renderer Styles (Enhanced with Theme Variables) */
/* Light theme (default) scoped variables */
.latex-renderer-container {
    --lr-surface: #ffffff;
    --lr-surface-alt: #f8f9fa;
    --lr-surface-muted: #f1f3f5;
    --lr-panel-header: #f3f4f6;
    --lr-border: #d0d7de;
    --lr-border-strong: #b6bec6;
    --lr-divider-track-1: #f5f7f9;
    --lr-divider-track-2: #edf1f5;
    --lr-gutter: #eeeeee;
    --lr-gutter-text: #555555;
    --lr-text-primary: #1f2328;
    --lr-text-secondary: #5e6874;
    --lr-placeholder: #7d8895;
    --lr-scroll-track: #f0f2f4;
    --lr-scroll-thumb: #c2c8ce;
    --lr-status-warn-bg: #fff3cd;
    --lr-status-warn-fg: #856404;
    --lr-status-error-bg: #f8d7da;
    --lr-status-error-fg: #721c24;
    --lr-status-ok-bg: #d1ecf1;
    --lr-status-ok-fg: #0c5460;
    --lr-diagnostics-error-bg: #fff5f5;
    --lr-diagnostics-error-border: #dc3545;
    --lr-diagnostics-error-fg: #721c24;
    --lr-diagnostics-error-badge-bg: #dc3545;
    --lr-diagnostics-error-badge-fg: #ffffff;
    --lr-diagnostics-warn-fg: #856404;
    --lr-diagnostics-warn-badge-bg: #ffc107;
    --lr-diagnostics-warn-badge-fg: #222222;
    --lr-code-inline-bg: #f1f3f5;
    --lr-fullscreen-bg: #ffffff;
    --lr-button-bg: var(--primary-color, #2563eb);
    --lr-button-hover-bg: var(--primary-hover, #1d4ed8);
    --lr-select-bg: #ffffff;
    --lr-select-border: #d0d7de;
    --lr-select-text: #1f2328;
}

/* Dark theme overrides using both data-theme and .dark-mode */
[data-theme="dark"] .latex-renderer-container,
.dark-mode .latex-renderer-container {
    --lr-surface: #141a22;
    --lr-surface-alt: #1e242d;
    --lr-surface-muted: #232b35;
    --lr-panel-header: #1f2731;
    --lr-border: #2d3640;
    --lr-border-strong: #3a4652;
    --lr-divider-track-1: #1e2228;
    --lr-divider-track-2: #252c34;
    --lr-gutter: #1e1e1e;
    --lr-gutter-text: #888888;
    --lr-text-primary: #e6edf3;
    --lr-text-secondary: #9aa4af;
    --lr-placeholder: #6d7782;
    --lr-scroll-track: #1e242c;
    --lr-scroll-thumb: #39424d;
    --lr-status-warn-bg: #4e4015;
    --lr-status-warn-fg: #f4d487;
    --lr-status-error-bg: #4a1e24;
    --lr-status-error-fg: #ffb3bb;
    --lr-status-ok-bg: #1d3c44;
    --lr-status-ok-fg: #8fd3e0;
    --lr-diagnostics-error-bg: #2a1212;
    --lr-diagnostics-error-border: #733;
    --lr-diagnostics-error-fg: #f8d7da;
    --lr-diagnostics-error-badge-bg: #e55353;
    --lr-diagnostics-error-badge-fg: #ffffff;
    --lr-diagnostics-warn-fg: #ffe08a;
    --lr-diagnostics-warn-badge-bg: #e0aa1f;
    --lr-diagnostics-warn-badge-fg: #141a22;
    --lr-code-inline-bg: #2a3139;
    --lr-fullscreen-bg: #0d1117;
    --lr-button-bg: #2563eb;
    --lr-button-hover-bg: #1d4ed8;
    --lr-select-bg: #1e242d;
    --lr-select-border: #2d3640;
    --lr-select-text: #e6edf3;
}

.latex-renderer-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

.latex-renderer-container header {
    text-align: center;
    margin-bottom: 30px;
}

.latex-renderer-container h1 {
    color: var(--primary-color);
    margin-bottom: 10px;
    font-size: 2.5rem;
}

.latex-renderer-container p {
    color: var(--lr-text-secondary);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* Toolbar */
.toolbar {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
    justify-content: center;
}

.toolbar button {
    background: var(--lr-button-bg);
    color: #fff;
    border: 1px solid var(--lr-button-bg);
    padding: 10px 16px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all .25s ease;
    box-shadow: 0 2px 6px rgba(0, 0, 0, .08);
}

.toolbar button:hover {
    background: var(--lr-button-hover-bg);
    border-color: var(--lr-button-hover-bg);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, .18);
}

.toolbar button:active {
    transform: translateY(0);
    box-shadow: 0 1px 3px rgba(0, 0, 0, .25);
}

.toolbar select {
    background: var(--lr-select-bg);
    color: var(--lr-select-text);
    border: 1px solid var(--lr-select-border);
    padding: 10px 12px;
    border-radius: 6px;
    font-size: 14px;
    cursor: pointer;
    min-width: 110px;
    transition: background .25s, border-color .25s;
}

.toolbar select:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 1px;
}

/* Split Container */
.split-container {
    display: grid;
    grid-template-columns: 1fr 6px 1fr;
    gap: 0;
    min-height: 600px;
    border: 1px solid var(--lr-border);
    border-radius: 12px;
    overflow: hidden;
    background: var(--lr-surface);
    box-shadow: 0 4px 20px rgba(0, 0, 0, .08);
}

.editor-panel,
.preview-panel {
    display: flex;
    flex-direction: column;
    position: relative;
    min-width: 120px;
}

.divider {
    width: 6px;
    background: linear-gradient(var(--lr-divider-track-1), var(--lr-divider-track-2));
    cursor: col-resize;
    position: relative;
}

.divider:hover,
.divider:focus {
    background: var(--primary-color);
    outline: none;
}

.divider::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 2px;
    height: 30px;
    background: var(--border-color);
    border-radius: 2px;
}

/* Panel header */
.panel-header {
    background: var(--lr-panel-header);
    padding: 15px 20px;
    border-bottom: 1px solid var(--lr-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.panel-header h3 {
    margin: 0;
    font-size: 1.2rem;
    color: var(--lr-text-primary);
}

.char-count {
    color: var(--lr-text-secondary);
    font-size: .9rem;
}

.status {
    color: var(--lr-text-secondary);
    font-size: .9rem;
    padding: 4px 8px;
    border-radius: 4px;
    background: var(--lr-surface-muted);
}

.status.rendering {
    background: var(--lr-status-warn-bg);
    color: var(--lr-status-warn-fg);
}

.status.error {
    background: var(--lr-status-error-bg);
    color: var(--lr-status-error-fg);
}

.status.success {
    background: var(--lr-status-ok-bg);
    color: var(--lr-status-ok-fg);
}

/* Editor */
.editor-wrapper {
    position: relative;
    flex: 1;
    display: flex;
    overflow: hidden;
    background: var(--lr-surface-alt);
    font-family: 'Courier New', monospace;
}

.line-numbers {
    background: var(--lr-gutter);
    color: var(--lr-gutter-text);
    padding: 20px 8px 20px 0;
    text-align: right;
    user-select: none;
    font-size: 12px;
    line-height: 1.5;
    border-right: 1px solid var(--lr-border);
    min-width: 3ch;
}

.line-numbers div {
    padding: 0 6px 0 10px;
}

#latex-input {
    flex: 1;
    border: none;
    padding: 20px;
    font-family: inherit;
    font-size: 14px;
    line-height: 1.5;
    resize: none;
    outline: none;
    background: transparent;
    color: var(--lr-text-primary);
    tab-size: 4;
    white-space: pre;
}

#latex-input::placeholder {
    color: var(--lr-placeholder);
    font-style: italic;
}

#latex-input:focus {
    background: var(--lr-surface);
}

/* Preview */
.output-content {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    background: var(--lr-surface);
    position: relative;
    color: var(--lr-text-primary);
}

.output-content.drawing-active {
    cursor: crosshair;
}

.placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--lr-text-secondary);
    text-align: center;
}

.placeholder i {
    font-size: 3rem;
    margin-bottom: 15px;
    opacity: .5;
}

.placeholder p {
    font-size: 1.1rem;
    margin: 0;
}

.output-content .MathJax {
    font-size: 1.2em !important;
}

.output-content mjx-container {
    margin: 10px 0;
}

/* Help Section */
.help-section {
    margin-top: 30px;
    border: 1px solid var(--lr-border);
    border-radius: 8px;
    overflow: hidden;
}

.help-section details summary {
    background: var(--lr-panel-header);
    padding: 15px 20px;
    cursor: pointer;
    font-weight: 600;
    font-size: 1.1rem;
    user-select: none;
    transition: background-color .3s ease;
}

.help-section details summary:hover {
    background: var(--lr-surface-muted);
}

.help-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    padding: 20px;
    background: var(--lr-surface);
}

.quick-ref-controls {
    display: flex;
    gap: 12px;
    align-items: center;
    padding: 12px 20px 0 20px;
    flex-wrap: wrap;
}

.quick-ref-controls input {
    flex: 1;
    min-width: 220px;
    padding: 8px 10px;
    border: 1px solid var(--lr-border);
    border-radius: 6px;
    background: var(--lr-surface-alt);
    color: var(--lr-text-primary);
    font-size: 14px;
}

.quick-ref-controls input:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.quick-ref-count {
    font-size: 12px;
    color: var(--lr-text-secondary);
}

.latex-snippet {
    display: inline-block;
    cursor: pointer;
    position: relative;
    padding: 2px 4px;
    border-radius: 4px;
    transition: background .25s, color .25s;
}

.latex-snippet code {
    background: none;
    padding: 0;
}

.latex-snippet:hover {
    background: var(--lr-surface-muted);
    color: var(--lr-text-primary);
}

.latex-snippet:active {
    background: var(--primary-color);
    color: #fff;
}

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

.help-column ul {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.help-column h4 {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.help-column {
    position: relative;
}

.help-column.hidden {
    display: none !important;
}

.help-column mark {
    background: #ffe58a;
    color: inherit;
    padding: 0 2px;
    border-radius: 2px;
}

.help-column h4 {
    color: var(--primary-color);
    margin-bottom: 10px;
    font-size: 1rem;
}

.help-column ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.help-column li {
    padding: 5px 0;
    border-bottom: 1px solid var(--border-light);
    font-size: .9rem;
}

.help-column li:last-child {
    border-bottom: none;
}

.help-column code {
    background: var(--lr-code-inline-bg);
    padding: 2px 6px;
    border-radius: 3px;
    font-family: 'Courier New', monospace;
    color: var(--primary-color);
    font-weight: 500;
}

/* Diagnostics */
.diagnostics {
    margin: 10px 0 15px;
    font-size: 0.85rem;
    line-height: 1.4;
    font-family: 'Courier New', monospace;
}

.diagnostics.empty {
    display: none;
}

.diagnostics ul {
    list-style: none;
    padding: 8px 12px;
    margin: 0;
    border: 1px solid var(--lr-diagnostics-error-border);
    border-left: 4px solid var(--lr-diagnostics-error-border);
    background: var(--lr-diagnostics-error-bg);
    border-radius: 6px;
}

.diagnostics li {
    margin: 2px 0;
    color: var(--lr-diagnostics-error-fg);
    display: flex;
    align-items: flex-start;
    gap: 6px;
}

.diagnostics li .badge {
    background: var(--lr-diagnostics-error-badge-bg);
    color: var(--lr-diagnostics-error-badge-fg);
    border-radius: 3px;
    padding: 0 4px;
    font-size: 0.65rem;
    letter-spacing: .5px;
    margin-top: 2px;
}

.diagnostics li.warning {
    color: var(--lr-diagnostics-warn-fg);
}

.diagnostics li.warning .badge {
    background: var(--lr-diagnostics-warn-badge-bg);
    color: var(--lr-diagnostics-warn-badge-fg);
}

.diagnostics summary {
    cursor: pointer;
}

/* Attribute-based diagnostics handled by variable overrides */

/* Fullscreen Mode */
.fullscreen-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: var(--lr-fullscreen-bg);
    z-index: 9999;
    display: none;
    flex-direction: column;
}

.fullscreen-overlay.active {
    display: flex;
}

.fullscreen-header {
    background: var(--bg-secondary);
    padding: 15px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.fullscreen-content {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    font-size: 1.3rem;
}

.close-fullscreen {
    background: #dc3545;
    color: #fff;
    border: none;
    padding: 8px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
}

.close-fullscreen:hover {
    background: #c82333;
}

/* (Legacy dark mode selectors replaced by variable system above) */

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .latex-renderer-container {
        padding: 15px;
    }

    .latex-renderer-container h1 {
        font-size: 2rem;
    }

    .split-container {
        grid-template-columns: 1fr;
        grid-template-rows: auto 6px auto;
        min-height: 800px;
    }

    .divider {
        width: 100%;
        height: 6px;
        cursor: row-resize;
    }

    .divider::after {
        width: 30px;
        height: 2px;
    }

    .toolbar {
        justify-content: flex-start;
        overflow-x: auto;
        padding-bottom: 10px;
    }

    .toolbar button,
    .toolbar select {
        flex-shrink: 0;
        padding: 8px 12px;
        font-size: 13px;
    }

    .help-content {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    #latex-input {
        font-size: 16px;
    }
}

@media (max-width: 480px) {
    .panel-header {
        padding: 10px 15px;
    }

    .panel-header h3 {
        font-size: 1rem;
    }

    #latex-input,
    .output-content {
        padding: 15px;
    }

    .toolbar button,
    .toolbar select {
        padding: 6px 10px;
        font-size: 12px;
    }
}

/* Loading animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid var(--lr-surface-muted);
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

/* Scrollbar styling */
.output-content::-webkit-scrollbar,
#latex-input::-webkit-scrollbar {
    width: 8px;
}

.output-content::-webkit-scrollbar-track,
#latex-input::-webkit-scrollbar-track {
    background: var(--lr-scroll-track);
}

.output-content::-webkit-scrollbar-thumb,
#latex-input::-webkit-scrollbar-thumb {
    background: var(--lr-scroll-thumb);
    border-radius: 4px;
}

.output-content::-webkit-scrollbar-thumb:hover,
#latex-input::-webkit-scrollbar-thumb:hover {
    background: var(--lr-text-secondary);
}

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

/* Drawing overlay */
.drawing-canvas-wrapper {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.drawing-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.drawing-canvas.highlight-layer {
    z-index: 1;
}

.drawing-canvas.pen-layer {
    z-index: 2;
}

.drawing-layer-active .drawing-canvas {
    pointer-events: auto;
}

.drawing-toolbar-active button#pen-btn,
.drawing-toolbar-active button#highlight-btn,
.drawing-toolbar-active button#eraser-btn {
    box-shadow: 0 0 0 2px var(--primary-color) inset;
}