/* Second Brain — Full Stylesheet */

:root {
  --bg-primary: #1e1e2e;
  --bg-secondary: #181825;
  --bg-tertiary: #11111b;
  --bg-surface: #313244;
  --bg-hover: #45475a;
  --text-primary: #cdd6f4;
  --text-secondary: #a6adc8;
  --text-muted: #6c7086;
  --accent: #89b4fa;
  --accent-hover: #74c7ec;
  --red: #f38ba8;
  --green: #a6e3a1;
  --yellow: #f9e2af;
  --purple: #cba6f7;
  --orange: #fab387;
  --teal: #94e2d5;
  --border: #45475a;
  --scrollbar-thumb: #585b70;
  --shadow: rgba(0,0,0,0.3);
  --font-main: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
  --sidebar-width: 260px;
  --topbar-height: 48px;
  --radius: 6px;
}

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

html, body {
  height: 100%;
  font-family: var(--font-main);
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 14px;
  overflow: hidden;
}

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #6c7086; }

#app { display: flex; flex-direction: column; height: 100%; }

/* ===== TOPBAR ===== */
#topbar {
  height: var(--topbar-height);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 12px;
  gap: 12px;
  flex-shrink: 0;
  z-index: 100;
}

.topbar-left { display: flex; align-items: center; gap: 8px; min-width: 200px; }
.app-title { font-size: 15px; font-weight: 600; color: var(--text-primary); user-select: none; }
.icon-btn {
  background: none; border: none; color: var(--text-secondary); cursor: pointer;
  font-size: 18px; padding: 4px; border-radius: 4px; line-height: 1;
}
.icon-btn:hover { background: var(--bg-hover); color: var(--text-primary); }
.icon-btn.small { font-size: 14px; padding: 2px 4px; }

.topbar-center { flex: 1; max-width: 500px; margin: 0 auto; }
#search-input {
  width: 100%; padding: 6px 12px; border-radius: var(--radius);
  border: 1px solid var(--border); background: var(--bg-surface);
  color: var(--text-secondary); font-size: 13px; cursor: pointer;
  outline: none; transition: border-color 0.2s;
}
#search-input:hover, #search-input:focus { border-color: var(--accent); color: var(--text-primary); }

.topbar-right { display: flex; gap: 6px; }
.btn {
  padding: 5px 12px; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--bg-surface); color: var(--text-secondary); cursor: pointer;
  font-size: 13px; transition: all 0.15s;
}
.btn:hover { background: var(--bg-hover); color: var(--text-primary); }
.btn.primary { background: var(--accent); color: var(--bg-tertiary); border-color: var(--accent); font-weight: 600; }
.btn.primary:hover { background: var(--accent-hover); }
.btn.danger { color: var(--red); border-color: var(--red); }
.btn.danger:hover { background: var(--red); color: var(--bg-tertiary); }
.btn.small { padding: 3px 8px; font-size: 12px; }

select {
  padding: 4px 8px; border-radius: var(--radius); border: 1px solid var(--border);
  background: var(--bg-surface); color: var(--text-secondary); font-size: 13px; outline: none;
}

/* ===== MAIN LAYOUT ===== */
#main-layout {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* ===== SIDEBARS ===== */
.sidebar {
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: width 0.2s ease, opacity 0.2s;
}
#sidebar-left { width: var(--sidebar-width); min-width: 200px; max-width: 400px; resize: horizontal; }
#sidebar-left.collapsed { width: 0; min-width: 0; padding: 0; border: none; overflow: hidden; }
#sidebar-right { width: 300px; border-right: none; border-left: 1px solid var(--border); }
#sidebar-right.collapsed { width: 0; min-width: 0; padding: 0; border: none; overflow: hidden; }

.sidebar-header {
  padding: 10px 12px; display: flex; align-items: center; justify-content: space-between;
  border-bottom: 1px solid var(--border);
}
.sidebar-header h3 { font-size: 12px; text-transform: uppercase; letter-spacing: 0.5px; color: var(--text-muted); font-weight: 600; }

#file-tree {
  flex: 1; overflow-y: auto; padding: 4px 0;
}

/* File tree nodes */
.tree-node { user-select: none; }
.tree-row {
  display: flex; align-items: center; padding: 3px 12px; cursor: pointer;
  gap: 4px; white-space: nowrap; transition: background 0.1s;
}
.tree-row:hover { background: var(--bg-hover); }
.tree-row.active { background: var(--bg-surface); color: var(--accent); }
.tree-row .toggle { width: 16px; text-align: center; flex-shrink: 0; color: var(--text-muted); font-size: 10px; }
.tree-row .icon { flex-shrink: 0; font-size: 14px; }
.tree-row .name { font-size: 13px; overflow: hidden; text-overflow: ellipsis; }
.tree-row.folder .name { color: var(--yellow); }
.tree-row.file .name { color: var(--text-secondary); }
.tree-children { padding-left: 12px; display: none; }
.tree-children.open { display: block; }
.tree-children > .tree-node { }

/* ===== EDITOR PANE ===== */
#editor-pane {
  flex: 1; display: flex; flex-direction: column; overflow: hidden; min-width: 0;
}

.toolbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 6px 12px; background: var(--bg-secondary);
  border-bottom: 1px solid var(--border); flex-shrink: 0;
}
.breadcrumb { font-size: 13px; color: var(--text-muted); }
.toolbar-actions { display: flex; gap: 6px; align-items: center; }

/* Editor area */
#editor-container {
  flex: 1; display: none; overflow: hidden; position: relative;
}
#editor-container.visible { display: flex; }

#md-editor {
  flex: 1; border: none; outline: none; resize: none;
  padding: 16px 20px;
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.6;
  background: var(--bg-primary);
  color: var(--text-primary);
  tab-size: 2;
}

.preview-panel {
  flex: 1; overflow-y: auto; padding: 20px 30px;
  background: var(--bg-primary);
  border-left: 1px solid var(--border);
  display: none;
}
.preview-panel.visible { display: block; }

/* Markdown preview styling (Obsidian-inspired) */
.preview-panel h1 { font-size: 2em; margin: 0.6em 0 0.4em; border-bottom: 1px solid var(--border); padding-bottom: 0.3em; }
.preview-panel h2 { font-size: 1.5em; margin: 0.5em 0 0.3em; border-bottom: 1px solid var(--border); padding-bottom: 0.2em; }
.preview-panel h3 { font-size: 1.25em; margin: 0.5em 0 0.3em; }
.preview-panel p { margin: 0.5em 0; line-height: 1.7; }
.preview-panel a { color: var(--accent); text-decoration: none; }
.preview-panel a:hover { text-decoration: underline; }
.preview-panel code {
  background: var(--bg-surface); padding: 2px 6px; border-radius: 3px;
  font-family: var(--font-mono); font-size: 0.9em; color: var(--orange);
}
.preview-panel pre {
  background: var(--bg-tertiary); padding: 14px 16px; border-radius: var(--radius);
  overflow-x: auto; margin: 0.8em 0; border: 1px solid var(--border);
}
.preview-panel pre code { background: none; padding: 0; color: var(--text-primary); }
.preview-panel ul, .preview-panel ol { padding-left: 24px; margin: 0.5em 0; }
.preview-panel li { margin: 0.25em 0; line-height: 1.6; }
.preview-panel blockquote {
  border-left: 3px solid var(--accent); padding: 0.5em 1em; margin: 0.5em 0;
  background: var(--bg-secondary); border-radius: 0 var(--radius) var(--radius) 0;
  color: var(--text-secondary);
}
.preview-panel hr { border: none; border-top: 1px solid var(--border); margin: 1em 0; }
.preview-panel table { border-collapse: collapse; width: 100%; margin: 0.8em 0; }
.preview-panel th, .preview-panel td { border: 1px solid var(--border); padding: 6px 12px; text-align: left; }
.preview-panel th { background: var(--bg-surface); font-weight: 600; }
.preview-panel img { max-width: 100%; border-radius: var(--radius); }
.preview-panel .task-list-item { list-style: none; margin-left: -20px; }
.preview-panel .task-list-item input[type="checkbox"] { margin-right: 6px; }
.preview-panel .callout {
  border-radius: var(--radius); padding: 12px 16px; margin: 0.8em 0;
  border-left: 4px solid;
}
.preview-panel .callout-note { background: rgba(137,180,250,0.1); border-color: var(--accent); }
.preview-panel .callout-tip { background: rgba(166,227,161,0.1); border-color: var(--green); }
.preview-panel .callout-warning { background: rgba(249,226,175,0.1); border-color: var(--yellow); }
.preview-panel .callout-important { background: rgba(203,166,247,0.1); border-color: var(--purple); }
.preview-panel .callout-caution { background: rgba(243,139,168,0.1); border-color: var(--red); }
.preview-panel mark { background: rgba(249,226,175,0.3); border-radius: 2px; padding: 0 2px; }
.preview-panel .wikilink { color: var(--accent); cursor: pointer; text-decoration: none; }
.preview-panel .wikilink-broken { color: var(--red); text-decoration: line-through; opacity: 0.7; }
.preview-panel .tag { color: var(--teal); cursor: pointer; }
.preview-panel .tag::before { content: "#"; }
.preview-panel .frontmatter-key { color: var(--purple); }
.preview-panel .frontmatter-value { color: var(--green); }

/* Empty state */
.empty-state {
  display: none; flex-direction: column; align-items: center; justify-content: center;
  flex: 1; text-align: center; padding: 40px;
}
.empty-state.visible { display: flex; }
.empty-state h2 { color: var(--text-secondary); margin-bottom: 8px; font-size: 22px; }
.empty-state p { color: var(--text-muted); margin-bottom: 20px; }
.welcome-links { display: flex; gap: 10px; }

/* ===== RIGHT SIDEBAR TABS ===== */
.sidebar-tabs {
  display: flex; border-bottom: 1px solid var(--border); flex-shrink: 0;
}
.tab {
  flex: 1; padding: 8px; text-align: center; cursor: pointer;
  font-size: 12px; color: var(--text-muted); border-bottom: 2px solid transparent;
  background: none; border-top: none; border-left: none; border-right: none;
  transition: all 0.15s;
}
.tab:hover { color: var(--text-secondary); }
.tab.active { color: var(--accent); border-bottom-color: var(--accent); }

.sidebar-content { flex: 1; overflow-y: auto; }
.tab-content { display: none; padding: 8px; }
.tab-content.active { display: block; }

/* Backlinks */
.backlink-item {
  padding: 8px 10px; border-radius: var(--radius); margin-bottom: 6px;
  background: var(--bg-surface); cursor: pointer; transition: background 0.1s;
  font-size: 12px;
}
.backlink-item:hover { background: var(--bg-hover); }
.backlink-file { color: var(--accent); font-weight: 500; }
.backlink-line { color: var(--text-muted); font-size: 11px; }
.backlink-snippet { color: var(--text-secondary); margin-top: 4px; font-size: 12px; line-height: 1.5; }
.no-data { color: var(--text-muted); padding: 12px; font-size: 13px; text-align: center; }

/* Tags panel */
.tag-cloud { display: flex; flex-wrap: wrap; gap: 4px; }
.tag-pill {
  display: inline-block; padding: 2px 8px; border-radius: 12px;
  background: rgba(148,226,213,0.15); color: var(--teal); cursor: pointer;
  font-size: 12px; transition: background 0.15s;
}
.tag-pill:hover { background: rgba(148,226,213,0.3); }

/* Outline */
.outline-item { padding: 3px 8px; cursor: pointer; font-size: 12px; color: var(--text-secondary); }
.outline-item:hover { color: var(--text-primary); }
.outline-h1 { font-weight: 600; }
.outline-h2 { padding-left: 16px; }
.outline-h3 { padding-left: 32px; }
.outline-h4 { padding-left: 48px; font-size: 11px; }
.outline-h5 { padding-left: 64px; font-size: 11px; }
.outline-h6 { padding-left: 80px; font-size: 10px; }

/* Note info */
.info-row { display: flex; justify-content: space-between; padding: 4px 0; font-size: 12px; }
.info-label { color: var(--text-muted); }
.info-value { color: var(--text-secondary); }

/* ===== OVERLAYS ===== */
.overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.6); z-index: 500;
  display: flex; align-items: center; justify-content: center;
}
.overlay.hidden { display: none; }
.overlay-panel {
  background: var(--bg-primary); border-radius: 8px; width: 90vw; max-width: 1200px;
  height: 85vh; display: flex; flex-direction: column;
  border: 1px solid var(--border); box-shadow: 0 8px 32px var(--shadow);
}
.overlay-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 20px; border-bottom: 1px solid var(--border);
}
.overlay-header h2 { font-size: 18px; }
.close-btn { font-size: 22px; }
.overlay-body { flex: 1; overflow: auto; padding: 20px; }

/* Graph canvas */
#graph-canvas { width: 100%; height: 100%; }
.graph-tooltip {
  position: absolute; background: var(--bg-surface); border: 1px solid var(--border);
  border-radius: 4px; padding: 6px 10px; font-size: 12px; pointer-events: none;
  box-shadow: 0 2px 8px var(--shadow); white-space: nowrap; z-index: 10;
}

/* Tag view */
.tag-view-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 12px;
}
.tag-card {
  background: var(--bg-surface); border-radius: var(--radius); padding: 14px;
  cursor: pointer; transition: background 0.15s;
}
.tag-card:hover { background: var(--bg-hover); }
.tag-card-name { color: var(--teal); font-weight: 600; margin-bottom: 6px; font-size: 14px; }
.tag-card-count { color: var(--text-muted); font-size: 12px; margin-bottom: 8px; }
.tag-card-files { font-size: 12px; color: var(--text-secondary); }

/* Search overlay */
.search-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.7); z-index: 600;
  display: flex; align-items: flex-start; justify-content: center; padding-top: 12vh;
}
.search-overlay.hidden { display: none; }
.search-box {
  background: var(--bg-primary); border-radius: 8px; width: 600px; max-width: 90vw;
  border: 1px solid var(--border); box-shadow: 0 8px 32px var(--shadow);
  max-height: 60vh; display: flex; flex-direction: column;
}
#search-full {
  width: 100%; padding: 14px 16px; border: none; border-bottom: 1px solid var(--border);
  background: transparent; color: var(--text-primary); font-size: 16px; outline: none;
}
.search-results { overflow-y: auto; max-height: calc(60vh - 56px); }
.search-result-item {
  padding: 10px 16px; cursor: pointer; border-bottom: 1px solid var(--border);
  transition: background 0.1s;
}
.search-result-item:hover { background: var(--bg-hover); }
.search-result-title { font-size: 14px; color: var(--accent); margin-bottom: 2px; }
.search-result-snippet { font-size: 12px; color: var(--text-secondary); line-height: 1.4; }
.search-result-meta { font-size: 11px; color: var(--text-muted); margin-top: 2px; }
.search-empty { padding: 20px; text-align: center; color: var(--text-muted); }

/* Modals */
.modal {
  position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 700;
  display: flex; align-items: center; justify-content: center;
}
.modal.hidden { display: none; }
.modal-dialog {
  background: var(--bg-primary); border-radius: 8px; padding: 24px;
  width: 400px; border: 1px solid var(--border);
  box-shadow: 0 8px 32px var(--shadow);
}
.modal-dialog h3 { margin-bottom: 12px; }
.modal-dialog label { display: block; font-size: 12px; color: var(--text-muted); margin-bottom: 4px; }
.modal-dialog input[type="text"] {
  width: 100%; padding: 8px 12px; border-radius: var(--radius);
  border: 1px solid var(--border); background: var(--bg-surface);
  color: var(--text-primary); font-size: 14px; outline: none; margin-bottom: 16px;
}
.modal-dialog input:focus { border-color: var(--accent); }
.modal-actions { display: flex; gap: 8px; justify-content: flex-end; }

/* D3 graph node/edge styles */
.graph-link { stroke: var(--border); stroke-opacity: 0.5; fill: none; }
.graph-node circle { stroke: var(--bg-tertiary); stroke-width: 1.5px; cursor: grab; }
.graph-node text { font-size: 11px; fill: var(--text-secondary); pointer-events: none; text-anchor: middle; }
.graph-node.selected circle { stroke: var(--accent); stroke-width: 3px; }

/* Resizer handles */
.resizer {
  width: 4px; cursor: col-resize; background: transparent; transition: background 0.15s;
  flex-shrink: 0;
}
.resizer:hover { background: var(--accent); }