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

:root {
  --bg-body: #0e1019;
  --bg-surface: #141620;
  --bg-canvas: #0c0e16;
  --bg-panel: #111320;
  --bg-input: #0c0e16;
  --bg-hover: #1e2233;
  --bg-active: #2e2b5a;
  --border: #1e2233;
  --border-input: #252a3a;
  --border-active: #4f46b0;
  --text: #c8ccd4;
  --text-secondary: #6b7084;
  --text-muted: #4a4f62;
  --accent: #818cf8;
  --accent-text: #a5b4fc;
  --btn-bg: #1a1e2e;
  --btn-border: #252a3a;
  --btn-text: #8a8fa0;
  --toggle-bg: #1e2744;
  --toggle-border: #334670;
  --toggle-text: #7dd3fc;
  --grid-dot: #282d3e;
  --node-stroke: #555;
  --node-text: #c0c4d0;
  --pdf-bg: white;
  --inspector-header-bg: #181b2a;
  --drawer-bg: #111320;
  --drawer-border: #1e2233;
}

body.light {
  --bg-body: #f4f5f7;
  --bg-surface: #e4e5ea;
  --bg-canvas: #ffffff;
  --bg-panel: #edeef2;
  --bg-input: #ffffff;
  --bg-hover: #d8d9e0;
  --bg-active: #dddaf0;
  --border: #cccdd5;
  --border-input: #b8b9c5;
  --border-active: #7c75cc;
  --text: #1a1b2e;
  --text-secondary: #555670;
  --text-muted: #888998;
  --accent: #5b5fc7;
  --accent-text: #4a4eaa;
  --btn-bg: #dddee5;
  --btn-border: #c4c5d0;
  --btn-text: #555670;
  --toggle-bg: #d5e4f5;
  --toggle-border: #8ab4dd;
  --toggle-text: #2a6ea8;
  --grid-dot: #d0d1d9;
  --node-stroke: #999;
  --node-text: #333;
  --pdf-bg: white;
  --inspector-header-bg: #dddee8;
  --drawer-bg: #edeef2;
  --drawer-border: #cccdd5;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: var(--bg-body);
  color: var(--text);
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ── Toolbar ── */

#toolbar {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.75rem;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  min-height: 40px;
}

.toolbar-brand {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--accent);
  margin-right: 0.75rem;
  white-space: nowrap;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 0.2rem;
}

.toolbar-sep {
  width: 1px;
  height: 20px;
  background: var(--border);
  margin: 0 0.25rem;
  flex-shrink: 0;
}

.toolbar-spacer { flex: 1; }

.tool-btn {
  padding: 0.3rem 0.6rem;
  border: 1px solid var(--btn-border);
  background: var(--btn-bg);
  color: var(--btn-text);
  border-radius: 5px;
  cursor: pointer;
  font-size: 0.72rem;
  font-weight: 500;
  transition: all 0.12s;
  white-space: nowrap;
  line-height: 1.2;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}
.tool-btn:hover { background: var(--bg-hover); color: var(--text); }
.tool-btn.active { background: var(--bg-active); border-color: var(--border-active); color: var(--accent-text); }
.tool-btn.toggle.active { background: var(--toggle-bg); border-color: var(--toggle-border); color: var(--toggle-text); }
.tool-btn:disabled { opacity: 0.35; cursor: not-allowed; }
.tool-btn.small { padding: 0.25rem 0.45rem; font-size: 0.75rem; min-width: 26px; text-align: center; }

.compile-btn {
  background: #1a2e24 !important;
  border-color: #234d36 !important;
  color: #6ee7b7 !important;
}
.compile-btn:hover { background: #234d36 !important; }

.zoom-group { gap: 0.15rem; }
#zoom-level {
  font-size: 0.68rem;
  color: var(--text-muted);
  min-width: 36px;
  text-align: center;
  user-select: none;
}

#pyodide-status {
  font-size: 0.68rem;
  color: #a78025;
  margin-left: 0.5rem;
  white-space: nowrap;
}

/* ── Left Toolbar ── */

#left-toolbar {
  width: 40px;
  background: var(--bg-surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0.4rem 0;
  flex-shrink: 0;
  overflow-y: auto;
  overflow-x: hidden;
}

.lt-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 2px 0;
}

.lt-btn {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-secondary);
  border-radius: 5px;
  cursor: pointer;
  transition: all 0.12s;
  padding: 0;
}
.lt-btn:hover { background: var(--bg-hover); color: var(--text); }
.lt-btn.active { background: var(--bg-active); border-color: var(--border-active); color: var(--accent-text); }
.lt-btn:disabled { opacity: 0.25; cursor: not-allowed; }
.lt-btn:disabled:hover { background: transparent; color: var(--text-secondary); }
.lt-btn svg { pointer-events: none; }

/* ── Main layout ── */

#main {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* ── Canvas column ── */

#canvas-column {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 300px;
}

#canvas-area {
  flex: 1;
  position: relative;
  overflow: hidden;
  background: var(--bg-canvas);
  cursor: default;
  min-height: 200px;
}
#canvas-area.mode-node { cursor: crosshair; }
#canvas-area.mode-edge { cursor: cell; }

#svg-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* ── Drawer resize handle ── */

#canvas-resizer {
  height: 4px;
  background: var(--btn-bg);
  cursor: row-resize;
  flex-shrink: 0;
  transition: background 0.12s;
}
#canvas-resizer:hover { background: var(--border-active); }

/* ── Bottom Drawer ── */

#drawer {
  height: 200px;
  display: flex;
  flex-direction: column;
  background: var(--drawer-bg);
  border-top: 1px solid var(--drawer-border);
  flex-shrink: 0;
  overflow: hidden;
}

#drawer-tabs {
  display: flex;
  gap: 0.25rem;
  padding: 0.3rem 0.5rem;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.drawer-tab {
  padding: 0.2rem 0.65rem;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-muted);
  border-radius: 99px;
  cursor: pointer;
  font-size: 0.7rem;
  font-weight: 500;
  transition: all 0.12s;
}
.drawer-tab:hover { color: var(--text); background: var(--bg-hover); }
.drawer-tab.active { background: var(--bg-active); border-color: var(--border-active); color: var(--accent-text); }

.drawer-section {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 0.5rem 0.6rem;
}

/* ── Code panel ── */

#code-output { display: flex; flex-direction: column; gap: 0.3rem; }

.code-fold {
  border: 1px solid var(--btn-bg);
  border-radius: 4px;
  overflow: hidden;
}
.code-fold > summary {
  padding: 0.25rem 0.45rem;
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  background: var(--bg-canvas);
  cursor: pointer;
  user-select: none;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.code-fold > summary::-webkit-details-marker { display: none; }
.code-fold > summary::before { content: '\25B8  '; flex-shrink: 0; }
.code-fold[open] > summary::before { content: '\25BE  '; }
.code-fold > pre { margin: 0; padding: 0.4rem 0.6rem; overflow-x: auto; }

#python-code, #tikz-code {
  font-family: 'Fira Code', 'SF Mono', 'Cascadia Code', monospace;
  font-size: 0.68rem;
  white-space: pre;
  color: var(--accent-text);
  line-height: 1.5;
}

.copy-btn {
  font-size: 0.66rem;
  padding: 0.15rem 0.4rem;
  border: 1px solid var(--btn-border);
  background: transparent;
  color: var(--text-secondary);
  border-radius: 3px;
  cursor: pointer;
}
.copy-btn:hover { background: var(--btn-bg); color: var(--text); }

/* ── Raw TikZ ── */

#raw-tikz-input {
  width: 100%;
  min-height: 60px;
  height: 100%;
  background: var(--bg-input);
  border: 1px solid var(--border-input);
  color: var(--accent-text);
  border-radius: 4px;
  padding: 0.4rem 0.6rem;
  font-family: 'Fira Code', 'SF Mono', 'Cascadia Code', monospace;
  font-size: 0.68rem;
  line-height: 1.5;
  resize: none;
}
#raw-tikz-input:focus { outline: none; border-color: var(--border-active); }

/* ── PDF pane ── */

#pdf-pane-inner {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

#compile-btn {
  padding: 0.4rem;
  width: 100%;
  background: #1a2e24;
  color: #6ee7b7;
  border: 1px solid #234d36;
  border-radius: 5px;
  cursor: pointer;
  font-size: 0.76rem;
  font-weight: 600;
}
#compile-btn:hover { background: #234d36; }
#compile-btn:disabled { opacity: 0.4; cursor: not-allowed; }

#pdf-download {
  font-size: 0.72rem;
  color: #6ee7b7;
  text-decoration: none;
  padding: 0.25rem 0.5rem;
  border: 1px solid #234d36;
  border-radius: 4px;
  background: #1a2e24;
  display: inline-block;
  margin-bottom: 0.4rem;
}

#compile-log-details {
  border: 1px solid var(--btn-bg);
  border-radius: 4px;
  background: var(--bg-canvas);
}
#compile-log-details summary {
  padding: 0.25rem 0.5rem;
  font-size: 0.68rem;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
}
#compile-log {
  font-size: 0.65rem;
  font-family: monospace;
  color: var(--text-secondary);
  white-space: pre-wrap;
  word-break: break-all;
  padding: 0.4rem 0.6rem;
  max-height: 200px;
  overflow-y: auto;
  margin: 0;
}
#compile-log.has-error { color: #fca5a5; }
#compile-log .log-error { color: #f87171; font-weight: bold; }

#pdf-viewer {
  width: 100%;
  height: 420px;
  border: 1px solid var(--border-input);
  border-radius: 4px;
  background: var(--pdf-bg);
  display: block;
}

#preview-card-body {
  padding: 0.5rem;
  display: flex;
  flex-direction: column;
}

/* ── Right Panel Resize Handle ── */

#right-resizer {
  width: 4px;
  background: var(--btn-bg);
  cursor: col-resize;
  flex-shrink: 0;
  transition: background 0.12s;
}
#right-resizer:hover { background: var(--border-active); }

/* ── Right Panel (Inspector) ── */

#right-panel {
  width: 280px;
  min-width: 160px;
  max-width: 500px;
  display: flex;
  flex-direction: column;
  background: var(--bg-panel);
  border-left: 1px solid var(--border);
  overflow-y: auto;
  overflow-x: hidden;
  flex-shrink: 0;
}

/* ── Inspector Cards (Photoshop-style) ── */

.inspector-card {
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.inspector-card-header {
  display: flex;
  align-items: center;
  padding: 0.3rem 0.5rem;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  background: var(--inspector-header-bg);
  cursor: pointer;
  user-select: none;
  list-style: none;
  gap: 0.4rem;
}
.inspector-card-header::-webkit-details-marker { display: none; }
.inspector-card-header::before {
  content: '\25B8';
  font-size: 0.6rem;
  color: var(--text-muted);
}
.inspector-card[open] .inspector-card-header::before { content: '\25BE'; }

.inspector-card-body {
  padding: 0.5rem;
}

/* ── Properties panel ── */

.panel-body { padding: 0.6rem; }

.hint {
  font-size: 0.72rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.prop-row {
  display: flex;
  align-items: center;
  margin-bottom: 0.4rem;
  gap: 0.4rem;
}
.prop-row label {
  width: 80px;
  font-size: 0.7rem;
  color: var(--text-secondary);
  flex-shrink: 0;
}
.prop-row input, .prop-row select {
  flex: 1;
  background: var(--bg-input);
  border: 1px solid var(--border-input);
  color: var(--text);
  border-radius: 4px;
  padding: 0.2rem 0.35rem;
  font-size: 0.72rem;
}
.prop-row input:focus, .prop-row select:focus { outline: none; border-color: var(--border-active); }
.prop-row input[type="color"] { padding: 0; height: 26px; cursor: pointer; border-radius: 4px; }
.prop-row input[type="checkbox"] { flex: none; width: 14px; height: 14px; }

.color-row-wrap {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
  min-width: 0;
}
.color-row-wrap input[type="color"] {
  flex: 1;
  min-width: 0;
}
.color-row-wrap.is-none input[type="color"] {
  opacity: 0.25;
}
.color-none-btn {
  flex: none;
  font-size: 0.66rem;
  padding: 2px 5px;
  height: 22px;
  border: 1px solid var(--border-input);
  border-radius: 3px;
  background: none;
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1;
}
.color-none-btn:hover { background: var(--btn-bg); color: var(--text); }
.color-row-wrap.is-none .color-none-btn {
  border-color: var(--border-active);
  color: var(--text-secondary);
}

.prop-group {
  margin-bottom: 0.2rem;
  border: 1px solid var(--btn-bg);
  border-radius: 4px;
  overflow: hidden;
}
.prop-group > summary {
  padding: 0.25rem 0.45rem;
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  background: var(--bg-surface);
  cursor: pointer;
  user-select: none;
  list-style: none;
}
.prop-group > summary::-webkit-details-marker { display: none; }
.prop-group > summary::before { content: '\25B8  '; }
.prop-group[open] > summary::before { content: '\25BE  '; }
.prop-group > .prop-group-body { padding: 0.3rem 0.4rem; }

.prop-node-id {
  font-size: 0.72rem;
  color: var(--accent);
  display: block;
  margin-bottom: 0.4rem;
  font-weight: 600;
}

/* ── Layers Panel ── */

.layer-row {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.25rem 0.35rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.72rem;
  transition: background 0.1s;
  border: 1px solid transparent;
}
.layer-row:hover { background: var(--bg-hover); }
.layer-row.active-layer { background: var(--bg-active); border-color: var(--border-active); }

.layer-vis-btn, .layer-lock-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.72rem;
  padding: 2px 4px;
  border-radius: 3px;
  line-height: 1;
}
.layer-vis-btn:hover, .layer-lock-btn:hover { background: var(--bg-hover); color: var(--text); }
.layer-vis-btn.hidden-layer { opacity: 0.35; }
.layer-lock-btn.locked-layer { color: #f59e0b; }

.layer-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--text);
}

.layer-count {
  font-size: 0.62rem;
  color: var(--text-muted);
  flex-shrink: 0;
  background: var(--bg-surface);
  padding: 1px 5px;
  border-radius: 10px;
  border: 1px solid var(--border);
}

.layer-actions {
  display: flex;
  gap: 0.3rem;
  padding: 0.4rem 0;
  margin-top: 0.3rem;
  border-top: 1px solid var(--border);
}

.layer-action-btn {
  padding: 0.25rem 0.5rem;
  font-size: 0.66rem;
  background: var(--btn-bg);
  border: 1px solid var(--btn-border);
  color: var(--btn-text);
  border-radius: 4px;
  cursor: pointer;
}
.layer-action-btn:hover { background: var(--bg-hover); color: var(--text); }

/* ── Multi-select ── */

.multi-select-info {
  font-size: 0.72rem;
  color: var(--accent);
  display: block;
  margin-bottom: 0.4rem;
  font-weight: 600;
}

.batch-btn {
  padding: 0.3rem 0.5rem;
  font-size: 0.68rem;
  background: var(--btn-bg);
  border: 1px solid var(--btn-border);
  color: var(--btn-text);
  border-radius: 4px;
  cursor: pointer;
  margin-right: 0.3rem;
  margin-bottom: 0.3rem;
}
.batch-btn:hover { background: var(--bg-hover); color: var(--text); }
.batch-btn.danger { color: #f87171; border-color: #5a2020; }
.batch-btn.danger:hover { background: #2a1a1a; }

/* ── SVG canvas elements ── */

.tikz-node rect, .tikz-node circle, .tikz-node ellipse, .tikz-node polygon {
  cursor: grab;
  transition: filter 0.1s;
}
.tikz-node.selected rect,
.tikz-node.selected circle,
.tikz-node.selected ellipse,
.tikz-node.selected polygon { filter: drop-shadow(0 0 5px rgba(129,140,248,0.5)); }
.tikz-node.edge-source rect,
.tikz-node.edge-source circle,
.tikz-node.edge-source ellipse,
.tikz-node.edge-source polygon { stroke: #fbbf24 !important; stroke-width: 2 !important; }
.tikz-node text {
  pointer-events: none;
  user-select: none;
  font-size: 11px;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
}

.tikz-edge { fill: none; cursor: pointer; }
.tikz-edge.selected { filter: drop-shadow(0 0 3px rgba(129,140,248,0.4)); }

/* ── Context menu ── */

#context-menu {
  display: none;
  position: fixed;
  z-index: 1000;
  background: var(--bg-surface);
  border: 1px solid var(--border-input);
  border-radius: 6px;
  min-width: 160px;
  padding: 0.25rem 0;
  box-shadow: 0 8px 24px rgba(0,0,0,0.5);
}

.ctx-item {
  display: block;
  width: 100%;
  padding: 0.35rem 0.75rem;
  background: none;
  border: none;
  color: var(--text);
  text-align: left;
  cursor: pointer;
  font-size: 0.72rem;
  font-family: inherit;
}
.ctx-item:hover { background: var(--bg-hover); }
.ctx-item.danger { color: #f87171; }
.ctx-item.danger:hover { background: #2a1a1a; }
.ctx-shortcut { float: right; color: var(--text-muted); font-size: 0.65rem; }

.ctx-sep { height: 1px; background: var(--border); margin: 0.2rem 0; }

/* ── Status bar ── */

#status-bar {
  font-size: 0.68rem;
  padding: 0.25rem 0.75rem;
  color: var(--text-muted);
  background: var(--bg-canvas);
  border-top: 1px solid var(--btn-bg);
  flex-shrink: 0;
}

/* ── Template Gallery ── */

#template-gallery {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 50;
  background: var(--bg-canvas);
  padding: 2rem;
}
#template-gallery.hidden { display: none; }

.tpl-title { font-size: 1.1rem; font-weight: 700; color: var(--text); margin-bottom: 0.3rem; }
.tpl-subtitle { font-size: 0.78rem; color: var(--text-muted); margin-bottom: 1.5rem; }

.tpl-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, 160px);
  gap: 0.75rem;
  justify-content: center;
  max-width: 720px;
}

.tpl-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-surface);
  cursor: pointer;
  transition: all 0.15s;
}
.tpl-card:hover {
  border-color: var(--accent);
  background: var(--bg-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}
.tpl-card svg { width: 120px; height: 70px; }
.tpl-card-name { font-size: 0.76rem; font-weight: 600; color: var(--text); }
.tpl-card-desc { font-size: 0.65rem; color: var(--text-muted); text-align: center; line-height: 1.3; }

/* ── Selection marquee ── */

#selection-marquee {
  position: absolute;
  border: 1px solid var(--accent);
  background: rgba(129, 140, 248, 0.08);
  pointer-events: none;
  z-index: 60;
  display: none;
}

/* ── Export button ── */
#btn-export-tex {
  background: #1a2433 !important;
  border-color: #2a4060 !important;
  color: #7dd3fc !important;
}
#btn-export-tex:hover { background: #2a4060 !important; }