/* web-cad v6 – Design Tokens, Typography, Base (with Drawer tokens) */
:root {
  --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', ui-monospace, monospace;

  --fs-xs: 11px;
  --fs-sm: 12px;
  --fs-md: 13px;
  --fs-lg: 14px;
  --fs-xl: 16px;
  --fs-2xl: 20px;

  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-light: #dbeafe;
  --color-primary-50: #eff6ff;

  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-2: #f1f5f9;
  --color-surface-3: #e2e8f0;
  --color-border: #e2e8f0;
  --color-border-strong: #cbd5e1;

  --color-text: #0f172a;
  --color-text-muted: #64748b;
  --color-text-faint: #94a3b8;

  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-ki: #8b5cf6;
  --color-ki-light: #ede9fe;

  --color-canvas-bg: #0f172a;
  --color-canvas-bg-2: #1e293b;
  --color-grid-minor: rgba(255,255,255,0.06);
  --color-grid-major: rgba(255,255,255,0.12);
  --color-grid-axis: rgba(96,165,250,0.28);
  --color-online: #10b981;

  --radius-xs: 3px;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 12px;

  --spacing-xs: 4px;
  --spacing-sm: 6px;
  --spacing-md: 10px;
  --spacing-lg: 14px;
  --spacing-xl: 20px;

  /* Layout */
  --topbar-h: 38px;
  --ribbon-h: 72px;
  --leftbar-w: 200px;
  --rightbar-w: 300px;
  --cmdline-h: 56px;
  --status-h: 26px;
  --canvas-toolbar-h: 38px;

  /* Mobile-specific */
  --mobile-right-tab-w: 56px;
  --mobile-topbar-h: 44px;
  --mobile-ribbon-h: 48px;
  --drawer-w: min(320px, 88vw);

  --shadow-sm: 0 1px 2px 0 rgba(15,23,42,0.04);
  --shadow-md: 0 2px 6px -1px rgba(15,23,42,0.08), 0 1px 3px -1px rgba(15,23,42,0.06);
  --shadow-lg: 0 10px 20px -4px rgba(15,23,42,0.10), 0 4px 8px -2px rgba(15,23,42,0.06);
  --shadow-drawer: -8px 0 24px -4px rgba(15,23,42,0.18);

  --t-fast: 120ms cubic-bezier(.2,.0,.2,1);
  --t-base: 200ms cubic-bezier(.2,.0,.2,1);
  --t-drawer: 280ms cubic-bezier(.32, .72, 0, 1);
}

[data-theme="dark"] {
  --color-bg: #0b0e14;
  --color-surface: #11151c;
  --color-surface-2: #161b24;
  --color-surface-3: #1d2330;
  --color-border: #232a36;
  --color-border-strong: #2f3849;
  --color-text: #e2e8f0;
  --color-text-muted: #94a3b8;
  --color-text-faint: #64748b;
  --color-primary-light: #1e3a8a;
  --color-primary-50: #172554;
  --color-ki-light: #2e1065;
  --shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.3);
  --shadow-md: 0 2px 6px -1px rgba(0,0,0,0.4);
  --shadow-lg: 0 10px 20px -4px rgba(0,0,0,0.5);
  --shadow-drawer: -8px 0 24px -4px rgba(0,0,0,0.6);
}

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

html, body {
  height: 100%;
  margin: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-md);
  background: var(--color-bg);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  line-height: 1.5;
  overflow: hidden;
  /* iOS safe areas */
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}

body {
  position: fixed;
  inset: 0;
  width: 100%;
}

button {
  font-family: inherit;
  font-size: inherit;
  cursor: pointer;
  background: transparent;
  border: none;
  color: inherit;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

input, select, textarea {
  font-family: inherit;
  font-size: inherit;
}

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--color-border-strong);
  border-radius: 10px;
  border: 2px solid var(--color-bg);
}
::-webkit-scrollbar-thumb:hover { background: var(--color-text-faint); }

*:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.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;
}

.skip-link {
  position: absolute;
  top: -40px;
  left: 8px;
  background: var(--color-primary);
  color: white;
  padding: 8px 12px;
  border-radius: var(--radius-md);
  z-index: 1000;
  font-weight: 500;
}
.skip-link:focus { top: 8px; }

/* Scrim (drawer backdrop) */
.scrim {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.5);
  z-index: 90;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--t-drawer), visibility 0s linear var(--t-drawer);
}
.scrim.show {
  opacity: 1;
  visibility: visible;
  transition: opacity var(--t-drawer), visibility 0s linear 0s;
}
/* web-cad v6 – Editor Layout (topbar, ribbon, sidebars, canvas, footer) + MOBILE responsive */

/* ============================================================
   APP GRID (desktop default)
   ============================================================ */
.app {
  display: grid;
  grid-template-rows: var(--topbar-h) var(--ribbon-h) 1fr var(--cmdline-h) var(--status-h);
  grid-template-columns: 100%;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  background: var(--color-bg);
}

/* ============================================================
   TOPBAR
   ============================================================ */
.topbar {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--spacing-md);
  height: var(--topbar-h);
  z-index: 30;
  flex-shrink: 0;
}
.topbar-left, .topbar-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}
.app-logo {
  width: 24px;
  height: 24px;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-ki) 100%);
  border-radius: var(--radius-sm);
  display: grid;
  place-items: center;
  color: white;
}
.app-logo svg { width: 14px; height: 14px; }
.app-name { font-weight: 700; font-size: var(--fs-lg); letter-spacing: -0.2px; }
.project-name {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-weight: 500;
  color: var(--color-text);
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: background var(--t-fast);
  background: transparent;
  border: none;
}
.project-name:hover { background: var(--color-surface-2); }
.project-name .caret { color: var(--color-text-faint); }
.saved-badge {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  padding: 2px 8px;
  background: var(--color-surface-2);
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.saved-badge::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-success);
}

.icon-btn-top {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  transition: all var(--t-fast);
}
.icon-btn-top:hover { background: var(--color-surface-2); color: var(--color-text); }
.icon-btn-top svg { width: 16px; height: 16px; }
.icon-btn-top.danger { color: var(--color-error); }

.lang-select {
  height: 28px;
  padding: 0 8px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  border-radius: var(--radius-sm);
  font-size: var(--fs-sm);
  color: var(--color-text);
  cursor: pointer;
}
.avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: linear-gradient(135deg, #f59e0b, #ef4444);
  color: white;
  display: grid;
  place-items: center;
  font-weight: 600;
  font-size: var(--fs-xs);
  cursor: pointer;
}

/* Hamburger button (mobile only, HIDDEN by default) */
.hamburger-btn {
  display: none;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  align-items: center;
  justify-content: center;
  color: var(--color-text);
}
.hamburger-btn:hover { background: var(--color-surface-2); }
.hamburger-btn svg { width: 20px; height: 20px; }

/* Right vertical tab bar (mobile only, HIDDEN by default on desktop) */
.right-tab-bar { display: none; }

/* Drawers + scrim (mobile only, HIDDEN by default on desktop) */
.drawer { display: none; }
.scrim { display: none; }

/* ============================================================
   RIBBON
   ============================================================ */
.ribbon {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  height: var(--ribbon-h);
  z-index: 25;
  flex-shrink: 0;
}
.ribbon-tabs {
  display: flex;
  height: 30px;
  border-bottom: 1px solid var(--color-border);
  padding: 0 var(--spacing-sm);
  gap: 2px;
  overflow-x: auto;
  scrollbar-width: none;
}
.ribbon-tabs::-webkit-scrollbar { display: none; }
.ribbon-tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 12px;
  height: 100%;
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  transition: all var(--t-fast);
  font-weight: 500;
  flex-shrink: 0;
}
.ribbon-tab:hover { color: var(--color-text); background: var(--color-surface-2); }
.ribbon-tab.active { color: var(--color-primary); border-bottom-color: var(--color-primary); }
.ribbon-tab svg { width: 14px; height: 14px; }

.ribbon-content {
  flex: 1;
  display: flex;
  align-items: center;
  padding: 0 var(--spacing-md);
  gap: var(--spacing-lg);
  overflow-x: auto;
  scrollbar-width: thin;
}
.ribbon-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  height: 100%;
  padding: 4px 0;
  position: relative;
}
.ribbon-group-btns { display: flex; align-items: center; gap: 2px; flex: 1; }
.ribbon-group-label {
  font-size: 10px;
  color: var(--color-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.4px;
  border-top: 1px solid var(--color-border);
  width: 100%;
  text-align: center;
  padding-top: 3px;
  margin-top: 2px;
}
.ribbon-divider {
  width: 1px;
  height: 60%;
  background: var(--color-border);
  align-self: center;
  flex-shrink: 0;
}

.ribbon-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  min-width: 44px;
  height: 38px;
  padding: 4px 6px;
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 10px;
  font-weight: 500;
  transition: all var(--t-fast);
  flex-shrink: 0;
}
.ribbon-btn:hover { background: var(--color-primary-50); color: var(--color-primary); }
[data-theme="dark"] .ribbon-btn:hover { background: var(--color-surface-3); color: var(--color-primary); }
.ribbon-btn:active { transform: scale(0.97); }
.ribbon-btn svg { width: 18px; height: 18px; }

/* ============================================================
   MAIN AREA (desktop 3-column)
   ============================================================ */
.main {
  display: grid;
  grid-template-columns: var(--leftbar-w) 1fr var(--rightbar-w);
  min-height: 0;
  background: var(--color-bg);
  overflow: hidden;
  position: relative;
}
.main.left-collapsed { grid-template-columns: 0 1fr var(--rightbar-w); }
.main.right-collapsed { grid-template-columns: var(--leftbar-w) 1fr 0; }
.main.both-collapsed { grid-template-columns: 0 1fr 0; }

/* ============================================================
   LEFT SIDEBAR (Desktop tool palette 2-col)
   ============================================================ */
.leftbar {
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}
.leftbar-header {
  padding: var(--spacing-md) var(--spacing-md) var(--spacing-sm);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.leftbar-title {
  font-size: var(--fs-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-text-muted);
}
.leftbar-toggle {
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-xs);
  color: var(--color-text-muted);
  transition: all var(--t-fast);
}
.leftbar-toggle:hover { background: var(--color-surface-2); color: var(--color-text); }
.leftbar-toggle svg { width: 14px; height: 14px; }

.tool-section {
  padding: var(--spacing-sm) var(--spacing-sm);
  border-bottom: 1px solid var(--color-border);
}
.tool-section-label {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-text-faint);
  padding: 0 6px 6px;
}
.tool-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
}
.tool-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  padding: 8px 4px;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  transition: all var(--t-fast);
  position: relative;
  min-height: 56px;
}
.tool-btn:hover { background: var(--color-surface-2); color: var(--color-text); }
.tool-btn.active {
  background: var(--color-primary);
  color: white;
  box-shadow: 0 2px 4px -1px rgba(37,99,235,0.4);
}
.tool-btn svg { width: 20px; height: 20px; stroke-width: 1.8; }
.tool-btn-label {
  font-size: 10px;
  font-weight: 500;
  line-height: 1;
  white-space: nowrap;
}
.tool-btn-kbd {
  position: absolute;
  top: 2px;
  right: 4px;
  font-size: 9px;
  font-weight: 600;
  color: var(--color-text-faint);
  background: var(--color-surface-2);
  border-radius: 2px;
  padding: 0 3px;
  font-family: var(--font-mono);
  opacity: 0;
  transition: opacity var(--t-fast);
}
.tool-btn:hover .tool-btn-kbd { opacity: 1; }
.tool-btn.active .tool-btn-kbd { color: rgba(255,255,255,0.7); background: rgba(255,255,255,0.15); }

.leftbar-footer {
  margin-top: auto;
  padding: var(--spacing-sm);
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-around;
}
.leftbar-footer-btn {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  transition: all var(--t-fast);
}
.leftbar-footer-btn:hover { background: var(--color-surface-2); color: var(--color-text); }
.leftbar-footer-btn svg { width: 16px; height: 16px; }

/* ============================================================
   CANVAS AREA
   ============================================================ */
.canvas-area {
  position: relative;
  background: var(--color-canvas-bg);
  overflow: hidden;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.canvas-toolbar {
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 5;
  display: flex;
  align-items: center;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  height: var(--canvas-toolbar-h);
  padding: 0 4px;
  gap: 2px;
}
.canvas-toolbar-btn {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-sm);
  color: var(--color-text);
  transition: all var(--t-fast);
}
.canvas-toolbar-btn:hover { background: var(--color-surface-2); }
.canvas-toolbar-btn.active { background: var(--color-primary); color: white; }
.canvas-toolbar-btn svg { width: 16px; height: 16px; }
.canvas-toolbar-divider {
  width: 1px;
  height: 18px;
  background: var(--color-border);
  margin: 0 4px;
}
.canvas-zoom-display {
  font-size: var(--fs-sm);
  font-weight: 600;
  font-family: var(--font-mono);
  padding: 0 8px;
  color: var(--color-text);
  min-width: 52px;
  text-align: center;
}

.canvas-coords {
  position: absolute;
  top: 12px;
  left: 12px;
  z-index: 5;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 6px 10px;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  color: var(--color-text);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  gap: 12px;
}
.canvas-coords-label { color: var(--color-text-muted); margin-right: 4px; }
.canvas-coords-val { font-weight: 600; }

.canvas-view-tabs {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 5;
  display: flex;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.canvas-view-tab {
  padding: 6px 10px;
  font-size: var(--fs-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  border-right: 1px solid var(--color-border);
  transition: all var(--t-fast);
}
.canvas-view-tab:last-child { border-right: none; }
.canvas-view-tab:hover { background: var(--color-surface-2); color: var(--color-text); }
.canvas-view-tab.active { background: var(--color-primary); color: white; }

.canvas-svg {
  flex: 1;
  width: 100%;
  height: 100%;
  display: block;
  cursor: crosshair;
}

/* ============================================================
   RIGHT SIDEBAR (Desktop tabs + content)
   ============================================================ */
.rightbar {
  background: var(--color-surface);
  border-left: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}
.rightbar-tabs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-surface-2);
}
.rightbar-tab {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding: 8px 4px;
  font-size: 10px;
  font-weight: 500;
  color: var(--color-text-muted);
  border-bottom: 2px solid transparent;
  transition: all var(--t-fast);
  position: relative;
}
.rightbar-tab:hover { color: var(--color-text); background: var(--color-surface); }
.rightbar-tab.active {
  color: var(--color-primary);
  background: var(--color-surface);
  border-bottom-color: var(--color-primary);
}
.rightbar-tab svg { width: 18px; height: 18px; }
.rightbar-tab-badge {
  position: absolute;
  top: 4px;
  right: 8px;
  background: var(--color-ki);
  color: white;
  font-size: 9px;
  font-weight: 700;
  border-radius: 999px;
  padding: 1px 5px;
  line-height: 1.3;
}

.rightbar-content {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-md);
}
.rightbar-panel { display: none; }
.rightbar-panel.active { display: block; }

.panel-section { margin-bottom: var(--spacing-lg); }
.panel-section-title {
  font-size: var(--fs-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Property rows */
.prop-row {
  display: grid;
  grid-template-columns: 90px 1fr;
  align-items: center;
  margin-bottom: var(--spacing-sm);
  gap: var(--spacing-sm);
}
.prop-label { font-size: var(--fs-sm); color: var(--color-text-muted); }
.prop-input, .prop-select {
  height: 30px;
  padding: 0 8px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  border-radius: var(--radius-sm);
  font-size: var(--fs-sm);
  color: var(--color-text);
  width: 100%;
  font-family: inherit;
}
.prop-input:focus, .prop-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-light);
}
.prop-color-row { display: flex; align-items: center; gap: 6px; }
.prop-color-swatch {
  width: 22px;
  height: 22px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border-strong);
  flex-shrink: 0;
}
.prop-swatch-input {
  width: 30px;
  height: 22px;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: transparent;
  cursor: pointer;
}

/* Layer Manager */
.layer-list { display: flex; flex-direction: column; gap: 2px; }
.layer-item {
  display: grid;
  grid-template-columns: 18px 18px 18px 1fr auto;
  align-items: center;
  gap: 6px;
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  font-size: var(--fs-sm);
  transition: background var(--t-fast);
}
.layer-item:hover { background: var(--color-surface-2); }
.layer-item.active { background: var(--color-primary-50); color: var(--color-primary); }
[data-theme="dark"] .layer-item.active { background: var(--color-surface-3); }
.layer-item-name { font-weight: 500; }
.layer-item-count { font-size: 10px; color: var(--color-text-faint); font-family: var(--font-mono); }
.layer-vis-btn, .layer-lock-btn, .layer-color-btn {
  width: 18px;
  height: 18px;
  display: grid;
  place-items: center;
  color: var(--color-text-muted);
  border-radius: var(--radius-xs);
  transition: all var(--t-fast);
}
.layer-vis-btn:hover, .layer-lock-btn:hover { background: var(--color-surface-3); color: var(--color-text); }
.layer-vis-btn.off { color: var(--color-text-faint); opacity: 0.4; }
.layer-vis-btn svg, .layer-lock-btn svg { width: 12px; height: 12px; }
.layer-color-btn { padding: 0; border: 1px solid var(--color-border); }

.add-layer-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: 100%;
  height: 30px;
  margin-top: var(--spacing-sm);
  border: 1px dashed var(--color-border-strong);
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  font-size: var(--fs-sm);
  transition: all var(--t-fast);
}
.add-layer-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-50);
}
[data-theme="dark"] .add-layer-btn:hover { background: var(--color-surface-3); }
.add-layer-btn svg { width: 14px; height: 14px; }

/* Block Library */
.lib-search { position: relative; margin-bottom: var(--spacing-md); }
.lib-search input {
  width: 100%;
  height: 32px;
  padding: 0 8px 0 30px;
  border: 1px solid var(--color-border);
  background: var(--color-surface-2);
  border-radius: var(--radius-sm);
  font-size: var(--fs-sm);
  color: var(--color-text);
}
.lib-search input:focus {
  outline: none;
  background: var(--color-surface);
  border-color: var(--color-primary);
}
.lib-search-icon {
  position: absolute;
  left: 8px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-faint);
}
.lib-search-icon svg { width: 14px; height: 14px; }

.lib-categories {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  margin-bottom: var(--spacing-md);
}
.lib-cat {
  padding: 4px 10px;
  font-size: var(--fs-xs);
  font-weight: 500;
  border-radius: 999px;
  background: var(--color-surface-2);
  color: var(--color-text-muted);
  transition: all var(--t-fast);
}
.lib-cat:hover { background: var(--color-surface-3); color: var(--color-text); }
.lib-cat.active { background: var(--color-primary); color: white; }

.lib-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}
.lib-item {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  cursor: grab;
  transition: all var(--t-fast);
}
.lib-item:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-50);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}
[data-theme="dark"] .lib-item:hover { background: var(--color-surface-3); }
.lib-item-icon {
  width: 100%;
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  background: var(--color-surface);
  border-radius: var(--radius-sm);
  color: var(--color-text);
}
.lib-item-icon svg { width: 28px; height: 28px; }
.lib-item-name {
  font-size: var(--fs-xs);
  font-weight: 500;
  text-align: center;
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}

/* KI Copilot */
.ki-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 1px solid var(--color-border);
}
.ki-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-ki) 0%, var(--color-primary) 100%);
  color: white;
  display: grid;
  place-items: center;
}
.ki-avatar svg { width: 16px; height: 16px; }
.ki-title { font-weight: 600; font-size: var(--fs-md); }
.ki-status {
  margin-left: auto;
  font-size: var(--fs-xs);
  color: var(--color-success);
  display: flex;
  align-items: center;
  gap: 4px;
}
.ki-status::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-success);
}

.ki-suggestions { display: flex; flex-direction: column; gap: 4px; margin-bottom: var(--spacing-md); }
.ki-suggestion-title {
  font-size: var(--fs-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-text-muted);
  margin-bottom: 4px;
}
.ki-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 10px;
  background: var(--color-ki-light);
  color: var(--color-ki);
  border-radius: var(--radius-md);
  font-size: var(--fs-sm);
  text-align: left;
  transition: all var(--t-fast);
  border: 1px solid transparent;
}
.ki-chip:hover { background: var(--color-ki); color: white; border-color: var(--color-ki); }
[data-theme="dark"] .ki-chip { background: var(--color-ki-light); }
.ki-chip svg { width: 14px; height: 14px; flex-shrink: 0; }

.ki-chat {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: var(--spacing-md);
}
.ki-msg { display: flex; gap: 6px; align-items: flex-start; }
.ki-msg-bubble {
  padding: 8px 10px;
  border-radius: var(--radius-md);
  font-size: var(--fs-sm);
  line-height: 1.4;
  max-width: 100%;
}
.ki-msg.user .ki-msg-bubble {
  background: var(--color-primary);
  color: white;
  border-bottom-right-radius: 2px;
}
.ki-msg.assistant .ki-msg-bubble {
  background: var(--color-surface-2);
  color: var(--color-text);
  border-bottom-left-radius: 2px;
}
.ki-msg.assistant .ki-msg-bubble strong { color: var(--color-ki); }

.ki-typing-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--color-text-muted);
  animation: ki-typing 1.4s infinite ease-in-out;
}
.ki-typing-dot:nth-child(2) { animation-delay: 0.2s; }
.ki-typing-dot:nth-child(3) { animation-delay: 0.4s; }
@keyframes ki-typing {
  0%, 60%, 100% { opacity: 0.3; transform: scale(0.8); }
  30% { opacity: 1; transform: scale(1); }
}
.ki-send-btn:disabled { opacity: 0.5; cursor: not-allowed; }

.ki-input-wrap {
  position: relative;
  display: flex;
  align-items: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  padding: 0 4px 0 10px;
  transition: border-color var(--t-fast);
}
.ki-input-wrap:focus-within {
  border-color: var(--color-ki);
  box-shadow: 0 0 0 3px var(--color-ki-light);
}
.ki-input {
  flex: 1;
  height: 34px;
  background: transparent;
  border: none;
  outline: none;
  font-size: var(--fs-sm);
  color: var(--color-text);
}
.ki-input::placeholder { color: var(--color-text-faint); }
.ki-voice-btn, .ki-send-btn {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  transition: all var(--t-fast);
}
.ki-voice-btn:hover { background: var(--color-surface-2); color: var(--color-ki); }
.ki-send-btn { background: var(--color-ki); color: white; }
.ki-send-btn:hover { background: var(--color-primary); }
.ki-voice-btn svg, .ki-send-btn svg { width: 14px; height: 14px; }

/* ============================================================
   COMMAND LINE + STATUS BAR
   ============================================================ */
.cmdline {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: stretch;
  height: var(--cmdline-h);
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  z-index: 20;
  flex-shrink: 0;
}
.cmdline-history {
  flex: 1;
  padding: 6px 12px;
  overflow-y: auto;
  display: flex;
  flex-direction: column-reverse;
  border-right: 1px solid var(--color-border);
  background: var(--color-surface-2);
}
.cmdline-history-entry {
  display: flex;
  gap: 8px;
  padding: 1px 0;
  line-height: 1.4;
}
.cmdline-history-entry .prefix { color: var(--color-primary); font-weight: 600; }
.cmdline-history-entry.info .prefix { color: var(--color-text-muted); }
.cmdline-history-entry.warn .prefix { color: var(--color-warning); }
.cmdline-history-entry.error .prefix { color: var(--color-error); }
.cmdline-history-entry .text { color: var(--color-text); }

.cmdline-input-wrap {
  display: flex;
  align-items: center;
  flex: 1.4;
  padding: 0 12px;
  gap: 8px;
}
.cmdline-prompt { color: var(--color-primary); font-weight: 700; font-size: var(--fs-md); }
.cmdline-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  color: var(--color-text);
}
.cmdline-input::placeholder { color: var(--color-text-faint); }

.statusbar {
  background: var(--color-surface-2);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  height: var(--status-h);
  padding: 0 var(--spacing-md);
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  z-index: 20;
  flex-shrink: 0;
  overflow: hidden;
}
.status-item {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 0 10px;
  height: 100%;
  border-right: 1px solid var(--color-border);
  transition: all var(--t-fast);
  cursor: pointer;
  white-space: nowrap;
}
.status-item:first-child { padding-left: 0; }
.status-item:last-child { border-right: none; margin-left: auto; padding-right: 0; }
.status-item:hover { background: var(--color-surface-3); color: var(--color-text); }
.status-item.active { color: var(--color-primary); }
.status-item svg { width: 12px; height: 12px; }
.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-online);
  display: inline-block;
}

/* ============================================================
   RESPONSIVE: TABLET (≤1024px) — narrow sidebars, no labels
   ============================================================ */
@media (max-width: 1280px) {
  :root { --rightbar-w: 280px; --leftbar-w: 180px; }
  .ribbon-group-label { display: none; }
  .prop-row { grid-template-columns: 80px 1fr; }
}

@media (max-width: 1024px) {
  :root {
    --leftbar-w: 64px;
    --rightbar-w: 240px;
  }
  /* Tools collapse to icon-only on tablet */
  .leftbar-title, .tool-section-label, .tool-btn-label { display: none; }
  .tool-grid { grid-template-columns: 1fr 1fr; gap: 2px; }
  .tool-btn { padding: 10px 4px; }
  .leftbar-header { justify-content: center; padding: 6px; }
  .leftbar-toggle { display: none; }
  .ribbon-group-label { display: none; }
  .canvas-view-tabs { display: none; }
  .rightbar-tab span { display: none; }
  .rightbar-tab { padding: 10px 2px; }
  .rightbar-tab svg { width: 20px; height: 20px; }
}

/* ============================================================
   RESPONSIVE: MOBILE (≤768px) — vertical right tab bar + drawers
   ============================================================ */
@media (max-width: 768px) {
  :root {
    --topbar-h: var(--mobile-topbar-h);
    --ribbon-h: var(--mobile-ribbon-h);
    --cmdline-h: 44px;
    --status-h: 32px;
  }

  /* Topbar: hamburger left, project center, notifications right */
  .hamburger-btn { display: flex; }
  .app-name, .saved-badge, .lang-select, .topbar > .topbar-right > *:not(.hamburger-btn):not(.icon-btn-top[aria-label="Benachrichtigungen"]):not(.avatar) {
    display: none;
  }
  .topbar { padding: 0 8px; gap: 6px; }
  .topbar-left { flex: 1; min-width: 0; }
  .project-name { padding: 4px 6px; min-width: 0; flex: 1; }
  .project-name > span:not(.caret) {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
  .project-name .caret { display: none; }
  .icon-btn-top { width: 34px; height: 34px; }

  /* Ribbon: tab strip + scrollable icon buttons only */
  .ribbon-tab span { display: none; }
  .ribbon-tab { padding: 0 12px; }
  .ribbon-tab svg { width: 16px; height: 16px; }
  .ribbon-content {
    padding: 0 8px;
    gap: 8px;
    overflow-x: auto;
  }
  .ribbon-group { display: none; }
  .ribbon-group.compact-mobile {
    display: flex;
    flex-direction: row;
    align-items: center;
    height: 100%;
    padding: 0;
    gap: 2px;
    flex: 1;
    min-width: 0;
  }
  .ribbon-group.compact-mobile .ribbon-group-btns { flex: 1; justify-content: space-around; }
  .ribbon-divider { display: none; }
  .ribbon-btn { min-width: 36px; }
  .ribbon-btn span { display: none; }

  /* Main area: NO left/right desktop columns, canvas + right tab bar */
  .main {
    grid-template-columns: 1fr var(--mobile-right-tab-w);
  }
  .leftbar, .rightbar { display: none; }

  /* Right tab bar (vertical icon bar, ALWAYS visible on mobile) */
  .right-tab-bar {
    display: flex;
    flex-direction: column;
    background: var(--color-surface);
    border-left: 1px solid var(--color-border);
    z-index: 15;
  }
  .right-tab-btn {
    flex: 1;
    min-height: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    padding: 6px 2px;
    color: var(--color-text-muted);
    border-bottom: 1px solid var(--color-border);
    border-left: 3px solid transparent;
    transition: all var(--t-fast);
    position: relative;
    font-size: 9px;
    font-weight: 500;
  }
  .right-tab-btn svg { width: 18px; height: 18px; }
  .right-tab-btn:hover { background: var(--color-surface-2); color: var(--color-text); }
  .right-tab-btn.active {
    color: var(--color-primary);
    background: var(--color-primary-50);
    border-left-color: var(--color-primary);
  }
  [data-theme="dark"] .right-tab-btn.active { background: var(--color-surface-3); }
  .right-tab-btn-badge {
    position: absolute;
    top: 4px;
    right: 4px;
    background: var(--color-ki);
    color: white;
    font-size: 9px;
    font-weight: 700;
    border-radius: 999px;
    padding: 1px 4px;
    line-height: 1.2;
  }
  .right-tab-btn:last-child { border-bottom: none; }

  /* Drawers (slide-in panels) */
  .drawer {
    position: fixed;
    top: 0;
    bottom: 0;
    width: var(--drawer-w);
    max-width: 88vw;
    background: var(--color-surface);
    z-index: 100;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-drawer);
    transition: transform var(--t-drawer);
    will-change: transform;
  }
  .drawer-left {
    left: 0;
    transform: translateX(-100%);
    border-right: 1px solid var(--color-border);
  }
  .drawer-right {
    right: 0;
    transform: translateX(100%);
    border-left: 1px solid var(--color-border);
  }
  .drawer.open { transform: translateX(0); }
  .drawer-header {
    height: var(--mobile-topbar-h);
    display: flex;
    align-items: center;
    padding: 0 12px;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-surface-2);
    gap: 8px;
    flex-shrink: 0;
  }
  .drawer-title {
    font-weight: 600;
    font-size: var(--fs-md);
    flex: 1;
    color: var(--color-text);
  }
  .drawer-close {
    width: 32px;
    height: 32px;
    display: grid;
    place-items: center;
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
  }
  .drawer-close:hover { background: var(--color-surface-3); color: var(--color-text); }
  .drawer-close svg { width: 18px; height: 18px; }
  .drawer-body {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-md);
  }

  /* Left drawer content: tool palette */
  .drawer-left .drawer-body { padding: var(--spacing-sm); }
  .drawer-left .tool-section { padding: 8px; }
  .drawer-left .tool-grid { grid-template-columns: repeat(4, 1fr); gap: 4px; }
  .drawer-left .tool-btn { padding: 10px 4px; }
  .drawer-left .tool-btn-kbd { display: none; }
  .drawer-left .tool-btn-label { display: block; }
  .drawer-left .tool-section-label { display: block; padding: 0 6px 6px; }

  /* Right drawer content: panel with mini tabs (Werkzeug/Layer/Bibliothek/KI) */
  .drawer-right .drawer-tabs {
    display: flex;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-surface-2);
    flex-shrink: 0;
  }
  .drawer-right .drawer-tab {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: 10px 6px;
    font-size: var(--fs-xs);
    font-weight: 500;
    color: var(--color-text-muted);
    border-bottom: 2px solid transparent;
    transition: all var(--t-fast);
  }
  .drawer-right .drawer-tab svg { width: 14px; height: 14px; }
  .drawer-right .drawer-tab.active {
    color: var(--color-primary);
    background: var(--color-surface);
    border-bottom-color: var(--color-primary);
  }
  .drawer-right .drawer-body { padding: var(--spacing-md); }

  /* Canvas: fill area, compact overlays */
  .canvas-coords { font-size: 10px; padding: 4px 8px; top: 8px; left: 8px; }
  .canvas-toolbar { bottom: 8px; padding: 0 2px; gap: 0; }
  .canvas-toolbar-btn { width: 28px; height: 28px; }
  .canvas-toolbar-divider { margin: 0 2px; }
  .canvas-zoom-display { font-size: 11px; min-width: 40px; padding: 0 4px; }

  /* Footer compact */
  .cmdline-history { display: none; }
  .cmdline-input-wrap { padding: 0 8px; }
  .cmdline-input { font-size: var(--fs-xs); }
  .statusbar { font-size: 10px; padding: 0 4px; }
  .status-item { padding: 0 6px; }
  .status-item span:not(.status-dot) { display: none; }
  .status-item .status-text-mobile { display: inline !important; }
  .status-dot { display: inline-block; }
  /* only show dot + Online indicator + a few key items */
  .status-item.hide-mobile { display: none; }

  /* SVG canvas: ensure it's scrollable/zoomable on touch */
  .canvas-svg { touch-action: pinch-zoom pan-x pan-y; }
}

/* Very small screens (<480px) */
@media (max-width: 480px) {
  :root { --mobile-right-tab-w: 52px; }
  .ribbon-content { padding: 0 4px; }
  .right-tab-btn svg { width: 16px; height: 16px; }
  .right-tab-btn { font-size: 8px; padding: 4px 2px; }
  .topbar { padding: 0 4px; }
  .statusbar { font-size: 9px; padding: 0 2px; }
}

/* Body lock when drawer open */
body.drawer-open { overflow: hidden; }

/* ===================== TREE COMPONENT (Layer + Library) ===================== */
.tree { padding: 4px 0; font-size: 12px; user-select: none; }
.tree-node { position: relative; }
.tree-row {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px 4px 4px;
  border-radius: 4px;
  cursor: pointer;
  min-height: 26px;
  color: var(--color-text);
  transition: background-color .12s;
}
.tree-row:hover { background: var(--color-surface-2, rgba(0,0,0,0.04)); }
.tree-row.active { background: rgba(37, 99, 235, 0.10); color: var(--color-primary, #2563eb); font-weight: 500; }

.tree-toggle {
  width: 16px;
  height: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--color-text-muted);
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  border-radius: 3px;
  transition: background-color .12s;
}
.tree-toggle:hover { background: rgba(0,0,0,0.08); color: var(--color-text); }
.tree-toggle svg { width: 12px; height: 12px; transition: transform .15s; }
.tree-toggle-leaf { visibility: hidden; cursor: default; }
.tree-toggle-leaf:hover { background: none; }

.tree-node[aria-expanded="true"] > .tree-row > .tree-toggle svg { transform: rotate(0deg); }
.tree-node[aria-expanded="false"] > .tree-row > .tree-toggle svg { transform: rotate(-90deg); }

.tree-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}
.tree-icon svg { width: 14px; height: 14px; }

.tree-name {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-size: 12px;
}

.tree-count {
  font-size: 10px;
  color: var(--color-text-muted);
  background: var(--color-surface-2, rgba(0,0,0,0.05));
  padding: 1px 6px;
  border-radius: 8px;
  flex-shrink: 0;
  font-variant-numeric: tabular-nums;
}

.tree-children { padding-left: 16px; border-left: 1px dashed var(--color-border, #e2e8f0); margin-left: 11px; }
.tree-children[hidden] { display: none; }

/* Library drag hint */
.lib-drag-hint {
  font-size: 14px;
  color: var(--color-text-muted);
  cursor: grab;
  user-select: none;
  flex-shrink: 0;
  opacity: 0;
  transition: opacity .15s;
}
.tree-row:hover .lib-drag-hint { opacity: 0.7; }
.lib-draggable.dragging { opacity: 0.4; }

/* Tree scrollable container */
.rightbar-panel .tree { max-height: calc(100vh - 360px); overflow-y: auto; padding-right: 4px; }

/* Mobile drawer: same tree styling */
.drawer-right .tree { padding: 8px 4px; font-size: 13px; }
.drawer-right .tree-name { font-size: 13px; }
.drawer-right .tree-row { min-height: 30px; padding: 6px 10px; }

/* ─── Plugin Manager ──────────────────────────────────── */
.plugin-manager { padding: 8px; }
.plugin-manager-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 4px 8px 12px; border-bottom: 1px solid var(--color-border); margin-bottom: 8px;
}
.plugin-card {
  border: 1px solid var(--color-border);
  border-radius: 6px;
  margin-bottom: 6px;
  overflow: hidden;
  transition: border-color 0.2s;
}
.plugin-card.enabled { border-color: var(--color-primary); }
.plugin-card.expanded .plugin-card-body { display: block; }
.plugin-card-header {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px; cursor: pointer; user-select: none;
}
.plugin-icon { width: 20px; height: 20px; flex-shrink: 0; display: flex; align-items: center; }
.plugin-icon svg { width: 18px; height: 18px; }
.plugin-info { flex: 1; min-width: 0; }
.plugin-name { font-size: 13px; font-weight: 600; color: var(--color-text); }
.plugin-meta { font-size: 11px; color: var(--color-text-muted); margin-top: 2px; }
.plugin-card-body {
  display: none; padding: 0 12px 12px; border-top: 1px solid var(--color-border);
}
.plugin-description { font-size: 12px; color: var(--color-text-muted); margin: 8px 0 4px; line-height: 1.4; }
.plugin-author { font-size: 11px; color: var(--color-text-muted); }
.plugin-toggle {
  width: 36px; height: 20px; border-radius: 10px;
  border: none; cursor: pointer; position: relative;
  background: var(--color-border); transition: background 0.2s; flex-shrink: 0;
}
.plugin-toggle.on { background: var(--color-primary); }
.plugin-toggle-knob {
  position: absolute; top: 2px; left: 2px;
  width: 16px; height: 16px; border-radius: 50%;
  background: white; transition: transform 0.2s;
}
.plugin-toggle.on .plugin-toggle-knob { transform: translateX(16px); }