:root {
    --bg-deep: #0a0a0c;
    --bg-surface: #12121a;
    --bg-elevated: #1a1a24;
    --bg-hover: #252532;
    --text-primary: #e8e6e3;
    --text-secondary: #8a8a9a;
    --text-muted: #5a5a6a;
    --accent-math: #7dd3fc;
    --accent-field: #fbbf24;
    --border-subtle: #2a2a3a;
    --glow-math: rgba(125, 211, 252, 0.15);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: 'Crimson Pro', Georgia, serif;
    background: var(--bg-deep);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.7;
    font-size: 19px;
}

.header {
    position: fixed;
    top: 0; left: 0; right: 0;
    height: 48px;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    z-index: 100;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.header h1 {
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-secondary);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

.header-btn {
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    padding: 6px 12px;
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.15s;
}

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

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

.header-btn.primary:hover {
    background: #93e0ff;
}

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

.saved-indicator {
    font-family: 'JetBrains Mono', monospace;
    font-size: 10px;
    color: var(--text-muted);
    transition: all 0.3s;
    padding: 4px 8px;
    border-radius: 3px;
}

.saved-indicator.editing {
    color: #fbbf24;
}

.saved-indicator.local-saved {
    color: #93c5fd;
}

.saved-indicator.syncing {
    color: #a78bfa;
    animation: pulse 1.5s infinite;
}

.saved-indicator.synced {
    color: #6ee7b7;
}

.saved-indicator.error {
    color: #fca5a5;
    background: rgba(252, 165, 165, 0.1);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.header-hint {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    color: var(--text-muted);
}

.header-hint kbd {
    background: var(--bg-deep);
    padding: 2px 6px;
    border-radius: 3px;
}

/* .main styles now in Lemmanet section below */

.title {
    font-size: 32px;
    font-weight: 500;
    color: var(--text-primary);
    border: none;
    background: transparent;
    width: 100%;
    outline: none;
    font-family: inherit;
    margin-bottom: 24px;
}

.title::placeholder { color: var(--text-muted); }

#editor {
    min-height: 50vh;
    outline: none;
    line-height: 1.8;
}

#editor:empty::before {
    content: "Type \\\\ to insert math...";
    color: var(--text-muted);
    font-style: italic;
}

.math-node-wrapper {
    display: inline;
}

.math-node {
    display: inline-block;
    padding: 2px 4px;
    border-radius: 3px;
    cursor: pointer;
    vertical-align: middle;
    background: var(--glow-math);
}

.math-node:hover {
    outline: 1px solid var(--accent-math);
}

/* Palette */
#palette {
    position: fixed;
    z-index: 1000;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.5);
    width: 320px;
    max-height: 350px;
    display: none;
    overflow: hidden;
}

#palette.open { display: block; }

.palette-header {
    padding: 12px;
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    gap: 8px;
    align-items: center;
}

.palette-header span {
    color: var(--accent-math);
    font-family: 'JetBrains Mono', monospace;
}

#paletteInput {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 14px;
}

#paletteResults {
    max-height: 280px;
    overflow-y: auto;
}

.palette-item {
    padding: 8px 12px;
    display: flex;
    gap: 12px;
    align-items: center;
    cursor: pointer;
}

.palette-item:hover, .palette-item.selected {
    background: var(--bg-hover);
}

.palette-item-preview {
    width: 50px;
    text-align: center;
    color: var(--accent-math);
}

.palette-item-name {
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
}

.palette-item-desc {
    font-size: 11px;
    color: var(--text-muted);
}

/* Symbol Editor */
#symbolEditor {
    position: fixed;
    z-index: 999;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.5);
    padding: 16px;
    min-width: 280px;
    display: none;
}

#symbolEditor.open { display: block; }

.se-header {
    display: flex;
    gap: 12px;
    align-items: center;
    margin-bottom: 12px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-subtle);
}

.se-name {
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    color: var(--accent-math);
    background: var(--bg-elevated);
    padding: 4px 10px;
    border-radius: 4px;
}

.se-preview { color: var(--text-secondary); }

.se-fields { display: flex; flex-direction: column; gap: 8px; }

.se-field {
    display: flex;
    gap: 10px;
    align-items: center;
}

.se-field label {
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
    width: 60px;
    flex-shrink: 0;
}

.se-field-content {
    flex: 1;
    min-width: 0;
}

.se-field-input {
    width: 100%;
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
    padding: 6px 10px;
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    outline: none;
}

.se-field-input:focus {
    border-color: var(--accent-field);
}

.se-field-rich {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 4px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
    padding: 4px 8px;
    min-height: 32px;
}

.se-field-rich:focus-within {
    border-color: var(--accent-field);
}

.se-field-text {
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    color: var(--text-primary);
}

.se-field-math {
    display: inline-flex;
    align-items: center;
    background: var(--glow-math);
    padding: 2px 6px;
    border-radius: 3px;
    cursor: pointer;
    transition: outline 0.1s;
}

.se-field-math:hover {
    outline: 1px solid var(--accent-math);
}

.se-field-input-inline {
    flex: 1;
    min-width: 40px;
    background: transparent;
    border: none;
    padding: 2px 4px;
}

.se-field-input-inline:focus {
    outline: none;
}

.se-hint {
    margin-top: 12px;
    font-size: 11px;
    color: var(--text-muted);
}

.se-hint kbd {
    background: var(--bg-deep);
    padding: 2px 5px;
    border-radius: 3px;
    font-family: 'JetBrains Mono', monospace;
}

/* Notes Sidebar */
.notes-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: all 0.2s;
    z-index: 200;
}

.notes-overlay.open {
    opacity: 1;
    visibility: visible;
}

.notes-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 300px;
    background: var(--bg-surface);
    border-right: 1px solid var(--border-subtle);
    transform: translateX(-100%);
    transition: transform 0.2s ease-out;
    z-index: 201;
    display: flex;
    flex-direction: column;
}

.notes-sidebar.open {
    transform: translateX(0);
}

.notes-header {
    padding: 16px;
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.notes-header h2 {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.notes-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 24px;
    cursor: pointer;
    padding: 0;
    line-height: 1;
}

.notes-close:hover {
    color: var(--text-primary);
}

.notes-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
}

.note-item {
    padding: 12px;
    border-radius: 6px;
    cursor: pointer;
    margin-bottom: 4px;
    transition: background 0.1s;
}

.note-item:hover {
    background: var(--bg-hover);
}

.note-item.active {
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
}

.note-item-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.note-item-date {
    font-size: 11px;
    color: var(--text-muted);
}

.note-item-preview {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 4px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.note-item-actions {
    display: flex;
    gap: 8px;
    margin-top: 8px;
}

.note-item-delete {
    font-size: 11px;
    color: var(--text-muted);
    background: none;
    border: none;
    cursor: pointer;
    padding: 2px 6px;
    border-radius: 3px;
}

.note-item-delete:hover {
    background: #ff4444;
    color: white;
}

.notes-new {
    margin: 12px;
    padding: 12px;
    background: var(--bg-elevated);
    border: 1px dashed var(--border-subtle);
    border-radius: 6px;
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 13px;
    cursor: pointer;
    transition: all 0.1s;
}

.notes-new:hover {
    border-color: var(--accent-math);
    color: var(--accent-math);
}

.notes-empty {
    padding: 24px;
    text-align: center;
    color: var(--text-muted);
    font-size: 13px;
}

/* Print Styles */
@media print {
    body {
        background: white;
        color: black;
        font-size: 12pt;
    }

    .header, .notes-sidebar, .notes-overlay, #palette, #symbolEditor, #embedEditorModal {
        display: none !important;
    }

    .main {
        padding: 0;
        max-width: none;
    }

    .title {
        font-size: 24pt;
        border: none;
        color: black;
        margin-bottom: 12pt;
    }

    #editor {
        min-height: auto;
    }

    .math-node {
        background: none;
    }
    
    .embed-block iframe {
        border: 1px solid #ccc;
    }
}

/* Embed Blocks */
.embed-block {
    margin: 16px 0;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-subtle);
    background: var(--bg-surface);
}

.embed-block-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border-subtle);
}

.embed-block-type {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    color: var(--accent-math);
    text-transform: uppercase;
}

.embed-block-actions {
    display: flex;
    gap: 8px;
}

.embed-block-btn {
    background: var(--bg-hover);
    border: none;
    color: var(--text-secondary);
    font-size: 11px;
    padding: 4px 8px;
    border-radius: 3px;
    cursor: pointer;
    font-family: 'JetBrains Mono', monospace;
}

.embed-block-btn:hover {
    color: var(--text-primary);
    background: var(--border-subtle);
}

.embed-block-content {
    min-height: 100px;
    background: white;
}

.embed-block-content iframe {
    width: 100%;
    min-height: 200px;
    border: none;
    display: block;
}

/* Blocked Iframe Placeholder */
.blocked-iframe-placeholder {
    background: var(--bg-elevated);
    border: 2px dashed var(--border-subtle);
}

.blocked-iframe-placeholder button {
    font-family: 'JetBrains Mono', monospace;
    transition: all 0.2s;
}

.blocked-iframe-placeholder .approve-once-btn:hover {
    background: #5ba8ff !important;
    transform: translateY(-1px);
}

.blocked-iframe-placeholder .approve-always-btn:hover {
    background: #16a34a !important;
    transform: translateY(-1px);
}

.blocked-iframe-placeholder .view-url-btn:hover {
    background: var(--bg-hover) !important;
    border-color: var(--text-secondary) !important;
}

/* Code Block */
.code-block {
    margin: 16px 0;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-subtle);
    background: #2d2d2d;
}

.code-block-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    background: #1e1e1e;
    border-bottom: 1px solid var(--border-subtle);
}

.code-block-lang {
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    color: var(--accent-math);
    text-transform: uppercase;
}

.code-block-lang select {
    background: transparent;
    border: none;
    color: var(--accent-math);
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    text-transform: uppercase;
    cursor: pointer;
    outline: none;
}

.code-block-lang select option {
    background: var(--bg-surface);
    color: var(--text-primary);
}

.code-block-actions {
    display: flex;
    gap: 8px;
}

.code-block-btn {
    background: var(--bg-hover);
    border: none;
    color: var(--text-secondary);
    font-size: 11px;
    padding: 4px 8px;
    border-radius: 3px;
    cursor: pointer;
    font-family: 'JetBrains Mono', monospace;
}

.code-block-btn:hover {
    color: var(--text-primary);
    background: var(--border-subtle);
}

.code-block-content {
    position: relative;
}

.code-block-content pre {
    margin: 0;
    padding: 16px;
    background: #2d2d2d !important;
    overflow-x: auto;
}

.code-block-content code {
    font-family: 'JetBrains Mono', monospace !important;
    font-size: 13px !important;
    line-height: 1.5 !important;
    background: transparent !important;
}

.code-block-textarea {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    padding: 16px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    line-height: 1.5;
    color: transparent;
    background: transparent;
    border: none;
    resize: none;
    outline: none;
    caret-color: white;
    white-space: pre;
    overflow: auto;
}

/* Embed Editor Modal */
#embedEditorModal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    z-index: 300;
    display: none;
    justify-content: center;
    align-items: center;
    padding: 24px;
}

#embedEditorModal.open {
    display: flex;
}

.embed-editor {
    background: var(--bg-surface);
    border-radius: 12px;
    width: 100%;
    max-width: 900px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.embed-editor-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    border-bottom: 1px solid var(--border-subtle);
}

.embed-editor-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.embed-editor-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 24px;
    cursor: pointer;
    padding: 0;
    line-height: 1;
}

.embed-editor-body {
    flex: 1;
    display: flex;
    overflow: hidden;
}

.embed-editor-footer {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    padding: 12px 16px;
    border-top: 1px solid var(--border-subtle);
}

.embed-editor-footer button {
    padding: 8px 16px;
    border-radius: 4px;
    font-size: 13px;
    cursor: pointer;
}

.embed-editor-cancel {
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
}

.embed-editor-save {
    background: var(--accent-math);
    border: none;
    color: var(--bg-deep);
    font-weight: 500;
}

.embed-url-input {
    width: 100%;
    padding: 12px;
    background: var(--bg-deep);
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
    color: var(--text-primary);
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
}

.embed-url-input:focus {
    outline: none;
    border-color: var(--accent-math);
}

/* Help button and shortcuts */
.header-help {
    width: 28px;
    height: 28px;
    padding: 0;
    border-radius: 50%;
    font-weight: 600;
    font-size: 14px;
}

.shortcuts-hint {
    position: fixed;
    top: 56px;
    right: 24px;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    padding: 12px 16px;
    z-index: 150;
    display: none;
    box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

.shortcuts-hint.open {
    display: block;
}

.shortcuts-title {
    font-size: 11px;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 8px;
    letter-spacing: 0.05em;
}

.shortcut {
    font-size: 13px;
    color: var(--text-secondary);
    padding: 4px 0;
    display: flex;
    gap: 12px;
    align-items: center;
}

.shortcut kbd {
    background: var(--bg-deep);
    padding: 2px 6px;
    border-radius: 3px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    min-width: 60px;
    text-align: center;
}

/* Math mode */
.math-mode-indicator {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent-math);
    color: var(--bg-deep);
    padding: 8px 16px;
    border-radius: 6px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    display: none;
    z-index: 200;
    box-shadow: 0 4px 20px rgba(125, 211, 252, 0.3);
}

.math-mode-indicator.show {
    display: flex;
    align-items: center;
    gap: 12px;
}

.math-mode-indicator span {
    font-weight: 600;
}

.math-mode-indicator kbd {
    background: rgba(0,0,0,0.2);
    padding: 2px 6px;
    border-radius: 3px;
}

.math-mode-preview {
    display: inline-block;
    padding: 2px 4px;
    background: rgba(251, 191, 36, 0.2);
    border-radius: 3px;
    border: 1px dashed var(--accent-field);
    min-width: 8px;
    min-height: 1.2em;
    vertical-align: middle;
}

.math-mode-cursor {
    color: var(--accent-field);
    animation: blink 1s infinite;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

/* Vim Mode */
.vim-toggle {
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.05em;
}

.vim-toggle.active {
    background: #98c379;
    border-color: #98c379;
    color: var(--bg-deep);
}

.vim-toggle.active:hover {
    background: #a9d48a;
}

.vim-status {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 24px;
    background: var(--bg-surface);
    border-top: 1px solid var(--border-subtle);
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    display: none;
    align-items: center;
    padding: 0 16px;
    z-index: 100;
}

.vim-status.show {
    display: flex;
}

.vim-status .vim-mode {
    font-weight: 600;
    padding: 2px 8px;
    border-radius: 3px;
    margin-right: 12px;
}

.vim-status .vim-mode-normal {
    background: #61afef;
    color: var(--bg-deep);
}

.vim-status .vim-mode-insert {
    background: #98c379;
    color: var(--bg-deep);
}

.vim-status .vim-mode-visual {
    background: #c678dd;
    color: var(--bg-deep);
}

.vim-status .vim-mode-tree {
    background: #e5c07b;
    color: var(--bg-deep);
}

.vim-status .vim-buffer {
    color: var(--text-secondary);
}

/* Vim Block Cursor */
.vim-block-cursor-el {
    background: var(--text-primary);
    color: var(--bg-deep);
    pointer-events: none;
    z-index: 10;
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
    min-width: 0.6em;
    display: inline-block;
    text-align: center;
}

/* Hide native caret in normal mode */
.editor.vim-block-cursor {
    caret-color: transparent;
}

/* Tree vim selection */
.tree-node.vim-selected {
    background: var(--bg-hover);
    outline: 1px solid var(--accent-math);
}

#lemmanetTree.focused .tree-node.vim-selected {
    background: rgba(125, 211, 252, 0.15);
    outline: 2px solid var(--accent-math);
}

/* Editor unfocused state */
.editor.unfocused,
#noteTitle.unfocused {
    opacity: 0.7;
}

/* ============================================================================
   LEMMANET - App Layout & Components
   ============================================================================ */

/* App Container - Three Column Layout */
.app-container {
    display: flex;
    margin-top: 48px;
    height: calc(100vh - 48px);
}

/* Left Sidebar */
.lemmanet-sidebar {
    width: 280px;
    background: var(--bg-surface);
    border-right: 1px solid var(--border-subtle);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    border-bottom: 1px solid var(--border-subtle);
}

.sidebar-tabs {
    display: flex;
    gap: 4px;
}

.sidebar-tab {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 6px 10px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.15s;
}

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

.sidebar-tab.active {
    color: var(--accent-math);
    background: var(--bg-elevated);
}

.sidebar-tab svg {
    stroke: currentColor;
}

.sidebar-actions {
    display: flex;
    gap: 4px;
}

.sidebar-new-btn,
.sidebar-import-btn {
    width: 28px;
    height: 28px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    font-size: 18px;
    border-radius: 4px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sidebar-import-btn {
    font-size: 14px;
}

.sidebar-new-btn:hover,
.sidebar-import-btn:hover {
    background: var(--bg-hover);
    color: var(--accent-math);
    border-color: var(--accent-math);
}

.sidebar-content {
    flex: 1;
    overflow: hidden;
    position: relative;
}

/* File Tree */
.lemmanet-tree,
.lemmanet-graph {
    position: absolute;
    inset: 0;
    overflow: auto;
    display: none;
}

.lemmanet-tree.active,
.lemmanet-graph.active {
    display: block;
}

.tree-empty {
    padding: 24px;
    text-align: center;
    color: var(--text-muted);
    font-size: 13px;
}

.tree-node {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 6px 8px;
    cursor: pointer;
    transition: background 0.1s, border 0.2s, opacity 0.2s;
    user-select: none;
    border-left: 2px solid transparent;
}

.tree-node:hover {
    background: var(--bg-hover);
}

.tree-node.active {
    background: var(--bg-elevated);
    border-left: 2px solid var(--accent-math);
}

.tree-node.dragging {
    opacity: 0.5;
    cursor: grabbing;
}

.tree-node.drop-target {
    background: rgba(125, 211, 252, 0.15);
    border-left: 2px solid var(--accent-math);
}

.tree-node.drop-invalid {
    background: rgba(252, 165, 165, 0.1);
    border-left: 2px solid #fca5a5;
    cursor: not-allowed;
}

.tree-toggle {
    width: 16px;
    height: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    color: var(--text-muted);
    flex-shrink: 0;
}

.tree-toggle.collapsed,
.tree-toggle.expanded {
    cursor: pointer;
}

.tree-toggle:hover {
    color: var(--text-primary);
}

.tree-icon {
    font-size: 14px;
    flex-shrink: 0;
}

.tree-title {
    font-size: 13px;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    flex: 1;
}

.tree-badges {
    display: flex;
    gap: 2px;
    flex-shrink: 0;
}

.tree-badge {
    font-size: 10px;
    padding: 1px 3px;
    border-radius: 2px;
}

.tree-badge.dep {
    color: #c678dd;
}

.tree-badge.ref {
    color: #61afef;
}

.tree-children {
    /* Children rendered via JS */
}

/* Tree Context Menu */
.tree-context-menu {
    position: fixed;
    z-index: 1000;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 6px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.4);
    min-width: 160px;
    padding: 4px;
}

.tree-context-item {
    padding: 8px 12px;
    font-size: 13px;
    color: var(--text-secondary);
    border-radius: 4px;
    cursor: pointer;
}

.tree-context-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.tree-context-divider {
    height: 1px;
    background: var(--border-subtle);
    margin: 4px 8px;
}

/* Dependency Graph */
.lemmanet-graph {
    background: var(--bg-deep);
}

.graph-canvas {
    width: 100%;
    height: 100%;
}

/* Main Editor - Updated */
.main {
    flex: 1;
    padding: 32px 48px 120px;
    overflow-y: auto;
    min-width: 0;
}

/* Right Sidebar - Note Info */
.note-info-sidebar {
    width: 240px;
    background: var(--bg-surface);
    border-left: 1px solid var(--border-subtle);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    overflow: hidden;
}

.note-info-sidebar .note-info-header {
    padding: 12px 16px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 11px;
    text-transform: uppercase;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    border-bottom: 1px solid var(--border-subtle);
}

.note-info-panel {
    flex: 1;
    overflow-y: auto;
    padding: 8px 0;
}

.note-info-section {
    padding: 8px 12px;
}

.note-info-section .note-info-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
    margin-bottom: 6px;
}

.note-info-add {
    width: 20px;
    height: 20px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    color: var(--text-muted);
    border-radius: 3px;
    cursor: pointer;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.note-info-add:hover {
    color: var(--accent-math);
    border-color: var(--accent-math);
}

.note-info-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.note-info-item {
    padding: 6px 8px;
    font-size: 12px;
    color: var(--text-secondary);
    border-radius: 4px;
    cursor: pointer;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.note-info-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.note-info-empty {
    font-size: 11px;
    color: var(--text-muted);
    font-style: italic;
    padding: 4px 0;
}

/* Note Picker Modal */
.note-picker {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    z-index: 1100;
    display: none;
    align-items: center;
    justify-content: center;
}

.note-picker.open {
    display: flex;
}

.note-picker-content {
    background: var(--bg-surface);
    border-radius: 12px;
    width: 90%;
    max-width: 500px;
    max-height: 70vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 8px 40px rgba(0,0,0,0.5);
}

.note-picker-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    border-bottom: 1px solid var(--border-subtle);
}

.note-picker-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.note-picker-search {
    flex: 1;
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
    padding: 8px 12px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 14px;
    outline: none;
}

.note-picker-search:focus {
    border-color: var(--accent-math);
}

.note-picker-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 24px;
    cursor: pointer;
    padding: 0;
    line-height: 1;
}

.note-picker-close:hover {
    color: var(--text-primary);
}

.note-picker-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px;
}

.note-picker-item {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: 10px 12px;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.1s;
}

.note-picker-item:hover {
    background: var(--bg-hover);
}

.note-picker-item-title {
    font-size: 14px;
    color: var(--text-primary);
}

.note-picker-item-path {
    font-size: 11px;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
}

.note-picker-empty {
    padding: 24px;
    text-align: center;
    color: var(--text-muted);
    font-size: 13px;
}

/* Note Links in Editor */
.note-link {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 14px;
    cursor: pointer;
    vertical-align: middle;
    transition: all 0.1s;
}

.note-link-ref {
    background: rgba(97, 175, 239, 0.15);
    color: #61afef;
    border: 1px solid rgba(97, 175, 239, 0.3);
}

.note-link-ref:hover {
    background: rgba(97, 175, 239, 0.25);
    border-color: rgba(97, 175, 239, 0.5);
}

.note-link-dep {
    background: rgba(198, 120, 221, 0.15);
    color: #c678dd;
    border: 1px solid rgba(198, 120, 221, 0.3);
}

.note-link-dep:hover {
    background: rgba(198, 120, 221, 0.25);
    border-color: rgba(198, 120, 221, 0.5);
}

.note-link-icon {
    font-size: 12px;
}

/* Library Picker Modal */
#libraryPickerModal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    z-index: 1200;
    display: none;
    align-items: center;
    justify-content: center;
}

#libraryPickerModal.open {
    display: flex;
}

.library-picker {
    background: var(--bg-surface);
    border-radius: 12px;
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 8px 40px rgba(0,0,0,0.5);
}

.library-picker-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-subtle);
}

.library-picker-title {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-primary);
}

.library-picker-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 24px;
    cursor: pointer;
    padding: 0;
    line-height: 1;
}

.library-picker-close:hover {
    color: var(--text-primary);
}

.library-picker-body {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
}

.library-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 16px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: 8px;
    margin-bottom: 12px;
    cursor: pointer;
    transition: all 0.15s;
}

.library-item:hover {
    border-color: var(--accent-math);
    background: var(--bg-hover);
}

.library-item-icon {
    font-size: 32px;
    flex-shrink: 0;
}

.library-item-info {
    flex: 1;
    min-width: 0;
}

.library-item-name {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.library-item-desc {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 8px;
}

.library-item-meta {
    font-size: 11px;
    color: var(--text-muted);
    font-family: 'JetBrains Mono', monospace;
}

.library-picker-footer {
    padding: 12px 16px;
    border-top: 1px solid var(--border-subtle);
    display: flex;
    justify-content: flex-end;
}

.library-picker-cancel {
    padding: 8px 16px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    border-radius: 4px;
    font-size: 13px;
    cursor: pointer;
}

.library-picker-cancel:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

/* ============================================================================
   RESOURCES PANEL
   ============================================================================ */

.resources-panel {
    padding: 12px;
    overflow-y: auto;
}

.resource-item {
    padding: 10px;
    margin-bottom: 8px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: 6px;
    transition: border-color 0.2s;
}

.resource-item:hover {
    border-color: var(--accent);
}

.resource-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 8px;
}

.resource-link {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 6px;
    text-decoration: none;
    color: var(--accent);
    font-size: 13px;
    font-weight: 500;
    transition: color 0.2s;
}

.resource-link:hover {
    color: var(--accent-hover);
}

.external-icon {
    flex-shrink: 0;
    opacity: 0.6;
}

.resource-title {
    word-break: break-word;
}

.resource-actions {
    display: flex;
    gap: 4px;
    flex-shrink: 0;
}

.resource-description {
    margin: 8px 0 0 0;
    font-size: 12px;
    color: var(--text-secondary);
    line-height: 1.4;
}

.resource-type {
    display: inline-block;
    margin-top: 6px;
    padding: 2px 8px;
    background: var(--bg-primary);
    color: var(--text-muted);
    border-radius: 3px;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.add-resource-btn {
    padding: 2px 8px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

.add-resource-btn:hover {
    background: var(--accent-hover);
}

.empty-message {
    color: var(--text-muted);
    font-size: 12px;
    font-style: italic;
    text-align: center;
    padding: 20px;
}

/* ============================================================================
   RESOURCE MODAL
   ============================================================================ */

.modal {
    display: none;
    position: fixed;
    z-index: 10000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: var(--bg-primary);
    border-radius: 8px;
    width: 90%;
    max-width: 500px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-subtle);
}

.modal-header h3 {
    margin: 0;
    font-size: 18px;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: background 0.2s;
}

.modal-close:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

#resource-form {
    padding: 20px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 8px 12px;
    background: var(--bg-elevated);
    border: 1px solid var(--border-subtle);
    border-radius: 4px;
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
}

.form-group textarea {
    resize: vertical;
    min-height: 60px;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 20px;
}

.btn-secondary,
.btn-primary {
    padding: 8px 16px;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
}

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

.btn-secondary:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

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

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

/* Print - Hide sidebars */
@media print {
    .lemmanet-sidebar,
    .note-info-sidebar {
        display: none !important;
    }

    .app-container {
        display: block;
    }

    .main {
        padding: 0;
    }
}

/* ============================================================================
   IMAGE UPLOAD
   ============================================================================ */

.drag-over {
    background: rgba(103, 126, 234, 0.05);
    border: 2px dashed var(--accent);
}


/* Editor images */
#editor img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 10px 0;
    border-radius: 4px;
    transition: all 0.2s ease;
}

#editor img:hover {
    box-shadow: 0 2px 8px rgba(103, 126, 234, 0.2);
    outline: 2px solid rgba(103, 126, 234, 0.3);
}

#editor img.selected-image,
#editor img:focus {
    outline: 2px solid var(--accent);
    box-shadow: 0 2px 12px rgba(103, 126, 234, 0.4);
}

#editor img::selection {
    background: rgba(103, 126, 234, 0.2);
}