/* ============================================================
   GRAFKOM 2D — GrafKom Final Project | Kelompok 2
   style.css
   ============================================================ */

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

:root {
  --bg:           #0e0f14;
  --surface:      #16181f;
  --surface2:     #1c1e28;
  --surface3:     #252839;
  --border:       #2a2d3a;
  --border2:      #353847;
  --text:         #dde1f0;
  --text2:        #8890aa;
  --text3:        #4e5368;
  --accent:       #5b9bff;
  --accent-dim:   #1a3366;
  --accent-bg:    #0d1e3c;
  --green:        #3fd47f;
  --green-dim:    #123322;
  --amber:        #f5a623;
  --amber-dim:    #3a2508;
  --red:          #f45555;
  --red-dim:      #3a1212;
  --canvas-bg:    #090a0e;

  --font-ui:   'IBM Plex Sans', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', 'Cascadia Code', monospace;

  --r1: 3px;
  --r2: 5px;
  --r3: 7px;

  --menubar-h:  38px;
  --toolbar-h:  56px;
  --statusbar-h: 26px;
}

[data-theme="light"] {
  --bg:           #f0f1f5;
  --surface:      #ffffff;
  --surface2:     #e8eaf0;
  --surface3:     #dde0ea;
  --border:       #c8ccd8;
  --border2:      #b0b4c2;
  --text:         #1a1c28;
  --text2:        #4a4f68;
  --text3:        #8890aa;
  --accent:       #1a65e8;
  --accent-dim:   #b8d0ff;
  --accent-bg:    #e4edff;
  --green:        #1a8a4c;
  --green-dim:    #d0f0e0;
  --amber:        #c07a00;
  --amber-dim:    #fff0c8;
  --red:          #d02828;
  --red-dim:      #ffe0e0;
  --canvas-bg:    #ffffff;
}

html, body {
  height: 100%;
  overflow: hidden;
  font-family: var(--font-ui);
  font-size: 13px;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

/* ── APP SHELL ── */
.app {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

/* ══════════════════════════════════════
   MENUBAR
══════════════════════════════════════ */
.menubar {
  height: var(--menubar-h);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 8px;
  gap: 6px;
  flex-shrink: 0;
  position: relative;
  z-index: 100;
}

.app-logo {
  display: flex;
  align-items: center;
  gap: 7px;
  padding: 4px 10px 4px 4px;
  margin-right: 4px;
  border-right: 1px solid var(--border);
  flex-shrink: 0;
}
.logo-mark {
  width: 24px; height: 24px;
  background: var(--accent);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 9px;
  font-weight: 600;
  border-radius: var(--r2);
  display: flex; align-items: center; justify-content: center;
  letter-spacing: 0.05em;
  flex-shrink: 0;
}
.logo-text {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--text);
  white-space: nowrap;
}

/* Chips in menubar */
.menubar-chips {
  display: flex;
  align-items: center;
  gap: 5px;
  flex-shrink: 0;
}
.stat-chip {
  display: flex; align-items: center; gap: 5px;
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--text3);
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--r1);
  padding: 2px 8px;
  white-space: nowrap;
}
.mode-chip {
  color: var(--accent);
  background: var(--accent-bg);
  border-color: var(--accent-dim);
}

/* Coord display — stretches center */
.menubar-center {
  flex: 1;
  display: flex;
  justify-content: center;
  min-width: 0;
}
.coord-display {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text2);
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--r1);
  padding: 2px 9px;
  min-width: 90px;
  text-align: center;
}

/* Right side */
.menubar-right {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.info-trigger-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text2);
  padding: 4px 10px;
  border-radius: var(--r2);
  cursor: pointer;
  font-size: 11.5px;
  font-family: var(--font-ui);
  transition: background 0.1s, color 0.1s, border-color 0.1s;
  white-space: nowrap;
}
.info-trigger-btn:hover {
  background: var(--accent-bg);
  color: var(--accent);
  border-color: var(--accent-dim);
}
.info-trigger-btn svg { width: 13px; height: 13px; flex-shrink: 0; }

.theme-btn {
  width: 28px; height: 28px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--r2);
  color: var(--text2);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 14px;
  flex-shrink: 0;
  transition: background 0.1s;
}
.theme-btn:hover { background: var(--surface3); }

/* ══════════════════════════════════════
   TOOLBAR (Ribbon)
══════════════════════════════════════ */
.toolbar {
  min-height: var(--toolbar-h);
  background: var(--surface);
  border-bottom: 2px solid var(--border);
  display: flex;
  align-items: stretch;
  padding: 0;
  flex-shrink: 0;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: thin;
  scrollbar-color: var(--border2) transparent;
}
.toolbar::-webkit-scrollbar { height: 3px; }
.toolbar::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 2px; }

/* Each group wrapper */
.tb-group-wrap {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 2px 4px 14px;
  border-right: 1px solid var(--border);
  flex-shrink: 0;
  min-width: max-content;
}
.tb-group-wrap:last-child { border-right: none; }

.tb-group-label {
  position: absolute;
  bottom: 1px;
  left: 0; right: 0;
  text-align: center;
  font-size: 8.5px;
  color: var(--text3);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-family: var(--font-mono);
  user-select: none;
}

/* Tool buttons row inside groups */
.tb-tools {
  display: flex;
  align-items: center;
  gap: 2px;
  height: 100%;
  flex: 1;
  padding: 2px 0;
}

.tool-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  background: transparent;
  border: 1px solid transparent;
  color: var(--text2);
  padding: 4px 6px;
  border-radius: var(--r2);
  font-size: 9.5px;
  font-family: var(--font-ui);
  cursor: pointer;
  transition: background 0.1s, color 0.1s, border-color 0.1s;
  white-space: nowrap;
  min-width: 44px;
  height: 38px;
  flex-shrink: 0;
}
.tool-btn:hover { background: var(--surface2); color: var(--text); border-color: var(--border); }
.tool-btn.active {
  background: var(--accent-bg);
  border-color: var(--accent-dim);
  color: var(--accent);
  font-weight: 500;
}
.tool-icon {
  font-size: 15px;
  line-height: 1;
}

/* Color swatches */
.tb-colors {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 3px 4px;
  justify-content: center;
}
.color-row-tb {
  display: flex;
  gap: 6px;
  align-items: center;
}
.color-swatch-tb {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}
.color-swatch-tb label {
  font-size: 8px;
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-family: var(--font-mono);
}
input[type="color"] {
  width: 28px; height: 22px;
  border: 1px solid var(--border2);
  border-radius: var(--r1);
  background: var(--surface2);
  cursor: pointer;
  padding: 1px;
}

/* Thickness */
.tb-thickness {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 3px;
  padding: 3px 4px;
}
.tb-thickness label,
.tb-linetype label {
  font-size: 8px;
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-family: var(--font-mono);
}
.thickness-slider-row {
  display: flex;
  align-items: center;
  gap: 5px;
}

/* Eraser size control */
.tb-eraser {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 3px;
  padding: 3px 4px;
}
.tb-eraser label {
  font-size: 8px;
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-family: var(--font-mono);
}

input[type="range"] {
  height: 3px;
  accent-color: var(--accent);
  cursor: pointer;
  background: var(--border2);
  border-radius: 2px;
  outline: none;
  -webkit-appearance: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
  cursor: pointer;
}
.mono-val {
  font-size: 10px;
  font-family: var(--font-mono);
  color: var(--text2);
  min-width: 14px;
  text-align: right;
}

/* Line type select */
.tb-linetype {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 3px;
  padding: 3px 4px;
}
.sel-input {
  background: var(--surface2);
  border: 1px solid var(--border2);
  color: var(--text);
  border-radius: var(--r1);
  padding: 2px 6px;
  font-size: 11px;
  font-family: var(--font-ui);
  cursor: pointer;
  outline: none;
  width: 88px;
}
.sel-input option { background: var(--surface2); }

/* Display toggles */
.tb-toggles {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 4px 2px;
  justify-content: center;
}

/* Action buttons */
.tb-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
  padding: 4px 4px;
  width: 124px;
  align-content: center;
}
.act-btn {
  display: flex;
  align-items: center;
  gap: 4px;
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text2);
  padding: 3px 8px;
  border-radius: var(--r1);
  font-size: 10px;
  font-family: var(--font-ui);
  cursor: pointer;
  transition: background 0.1s, color 0.1s;
  white-space: nowrap;
}
.act-btn:hover { background: var(--surface3); color: var(--text); }
.act-btn.danger { border-color: var(--red-dim); color: var(--red); }
.act-btn.danger:hover { background: var(--red-dim); }
.act-btn.accent { border-color: var(--green-dim); color: var(--green); }
.act-btn.accent:hover { background: var(--green-dim); }
.act-btn.accent-blue { border-color: var(--accent-dim); color: var(--accent); }
.act-btn.accent-blue:hover { background: var(--accent-bg); }

/* Polygon controls */
.tb-poly {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 5px 4px;
  justify-content: center;
}

/* Toggle switch */
.toggle-item {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: 10.5px;
  color: var(--text2);
  cursor: pointer;
  white-space: nowrap;
  user-select: none;
}
.toggle-item input { display: none; }
.toggle-track {
  width: 26px; height: 14px;
  background: var(--surface3);
  border: 1px solid var(--border2);
  border-radius: 7px;
  position: relative;
  flex-shrink: 0;
}
.toggle-thumb {
  position: absolute;
  top: 2px; left: 2px;
  width: 8px; height: 8px;
  background: var(--text3);
  border-radius: 50%;
  transition: transform 0.15s, background 0.15s;
}
.toggle-item input:checked ~ .toggle-track { background: var(--accent-bg); border-color: var(--accent-dim); }
.toggle-item input:checked ~ .toggle-track .toggle-thumb { transform: translateX(12px); background: var(--accent); }

/* ══════════════════════════════════════
   MAIN BODY
══════════════════════════════════════ */
.main-body {
  flex: 1;
  display: flex;
  overflow: hidden;
}

/* ── LEFT PANEL ── */
.left-panel {
  width: 220px;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  overflow-x: hidden;
  scrollbar-width: thin;
  scrollbar-color: var(--border2) transparent;
  flex-shrink: 0;
}
.left-panel::-webkit-scrollbar { width: 4px; }
.left-panel::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 2px; }

/* Panel tabs */
.panel-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.ptab {
  flex: 1;
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text3);
  font-size: 10.5px;
  font-family: var(--font-ui);
  padding: 7px 0;
  cursor: pointer;
  text-align: center;
  transition: color 0.1s, border-color 0.1s;
}
.ptab:hover { color: var(--text2); }
.ptab.active { color: var(--accent); border-bottom-color: var(--accent); font-weight: 500; }

.tab-content { display: none; }
.tab-content.active { display: block; }

/* Panel sections */
.panel {
  padding: 8px 10px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.panel-label {
  font-size: 9px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text3);
  margin-bottom: 7px;
}

/* Object navigator */
.obj-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-bottom: 7px;
}
.nav-btn {
  width: 22px; height: 22px;
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text2);
  border-radius: var(--r1);
  cursor: pointer;
  font-size: 14px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.nav-btn:hover { background: var(--surface3); color: var(--text); }
.obj-label {
  flex: 1;
  font-size: 10px;
  font-family: var(--font-mono);
  color: var(--text2);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-align: center;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--r1);
  padding: 2px 5px;
}

/* Form rows */
.form-row {
  display: flex;
  align-items: center;
  gap: 5px;
  margin-bottom: 4px;
}
.form-label {
  width: 60px;
  flex-shrink: 0;
  font-size: 10.5px;
  color: var(--text2);
}
.form-row input[type="range"] { flex: 1; }
.val-display {
  width: 38px;
  text-align: right;
  font-size: 10px;
  font-family: var(--font-mono);
  color: var(--text2);
  flex-shrink: 0;
}

/* Manual inputs */
.manual-inputs {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 4px;
  margin: 5px 0 2px;
}
.mini-input-group {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.mini-input-group label {
  font-size: 8.5px;
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.mini-inp {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--r1);
  padding: 2px 4px;
  font-family: var(--font-mono);
  font-size: 10px;
  width: 100%;
  outline: none;
}
.mini-inp:focus { border-color: var(--accent); }

/* Reflect grid */
.reflect-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3px;
}
.refl-btn {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text2);
  padding: 4px 4px;
  border-radius: var(--r1);
  font-size: 10px;
  cursor: pointer;
  text-align: center;
}
.refl-btn:hover { background: var(--surface3); color: var(--accent); border-color: var(--accent-dim); }

/* Button pair */
.btn-pair {
  display: flex;
  gap: 3px;
}
.ctrl-btn {
  flex: 1;
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text2);
  padding: 4px 6px;
  border-radius: var(--r1);
  font-size: 10.5px;
  font-family: var(--font-ui);
  cursor: pointer;
  text-align: center;
  white-space: nowrap;
}
.ctrl-btn:hover { background: var(--surface3); color: var(--text); }
.ctrl-btn.danger { border-color: var(--red-dim); color: var(--red); }
.ctrl-btn.danger:hover { background: var(--red-dim); }
.ctrl-btn.accent { border-color: var(--green-dim); color: var(--green); }
.ctrl-btn.accent:hover { background: var(--green-dim); }
.ctrl-btn.accent-blue { border-color: var(--accent-dim); color: var(--accent); }
.ctrl-btn.accent-blue:hover { background: var(--accent-bg); }

/* Matrix display */
.matrix-box {
  margin-top: 6px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--r2);
  padding: 7px;
}
.matrix-caption {
  font-size: 8.5px;
  font-family: var(--font-mono);
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 5px;
}
.m-table { border-collapse: collapse; width: 100%; }
.m-table td {
  width: 33%;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 9.5px;
  color: var(--accent);
  padding: 2px;
  border: 1px solid var(--border);
}

/* Member list */
.member-list { display: flex; flex-direction: column; gap: 3px; }
.member-item {
  font-size: 10px;
  color: var(--text2);
  font-family: var(--font-mono);
  padding: 3px 6px;
  background: var(--surface2);
  border-radius: var(--r1);
}

/* Speed row in animation */
.speed-row {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 5px;
}
.speed-row label { font-size: 10.5px; color: var(--text2); flex-shrink: 0; }
.speed-row input[type="range"] { flex: 1; }

/* Keyboard shortcuts */
.kbd {
  display: inline-block;
  background: var(--surface2);
  border: 1px solid var(--border2);
  border-radius: 3px;
  padding: 1px 5px;
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text);
}

.algo-badge {
  font-size: 10px;
  font-family: var(--font-mono);
  color: var(--text3);
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--r1);
  padding: 2px 8px;
}

.hint { font-size: 9.5px; color: var(--text3); line-height: 1.4; margin-top: 4px; }
.mt4 { margin-top: 4px; }
.sep { height: 1px; background: var(--border); margin: 4px 0; }

/* ── SHAPE INFO PANEL ── */
.shape-info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
}

.si-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--r2);
  padding: 5px 7px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  transition: border-color 0.15s;
  position: relative;
  overflow: hidden;
}
.si-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 2px;
  height: 100%;
  background: var(--accent);
  opacity: 0.7;
  border-radius: 2px 0 0 2px;
}
.si-card.green::before  { background: var(--green); }
.si-card.amber::before  { background: var(--amber); }
.si-card.red::before    { background: var(--red); }
.si-card.accent::before { background: var(--accent); }

.si-card:hover { border-color: var(--border2); }

.si-label {
  font-size: 8px;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--text3);
}

.si-value {
  font-size: 12px;
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.si-value.green  { color: var(--green); }
.si-value.amber  { color: var(--amber); }
.si-value.accent { color: var(--accent); }
.si-value.red    { color: var(--red); }

.si-unit {
  font-size: 8.5px;
  font-family: var(--font-mono);
  color: var(--text3);
  margin-left: 1px;
}

/* Wide card spans full width */
.si-card.full {
  grid-column: 1 / -1;
}

/* Section divider inside info grid */
.si-divider {
  grid-column: 1 / -1;
  height: 1px;
  background: var(--border);
  margin: 2px 0;
}
.si-section-title {
  grid-column: 1 / -1;
  font-size: 8px;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text3);
  padding: 2px 0;
}

/* Pixel counter badge */
.si-pixel-bar {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--r2);
  padding: 5px 8px;
  position: relative;
  overflow: hidden;
}
.si-pixel-bar::before {
  content: '';
  position: absolute;
  top: 0; left: 0;
  width: 2px; height: 100%;
  background: var(--green);
  border-radius: 2px 0 0 2px;
}
.si-pixel-bar-label {
  font-size: 8px;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text3);
  flex-shrink: 0;
}
.si-pixel-bar-val {
  font-size: 12px;
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--green);
}
.si-pixel-bar-track {
  flex: 1;
  height: 3px;
  background: var(--surface3);
  border-radius: 2px;
  overflow: hidden;
}
.si-pixel-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--green), var(--accent));
  border-radius: 2px;
  transition: width 0.3s ease;
  min-width: 2px;
}


/* ══════════════════════════════════════
   CANVAS AREA
══════════════════════════════════════ */
.canvas-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
}

.canvas-wrap {
  flex: 1;
  overflow: auto;
  position: relative;
  /* Subtle paper texture / checkered bg to signal blank space (not pixels) */
  background-color: var(--canvas-bg);
  background-image:
    linear-gradient(45deg, rgba(255,255,255,0.012) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(255,255,255,0.012) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(255,255,255,0.012) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(255,255,255,0.012) 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
  padding: 14px;
}

[data-theme="light"] .canvas-wrap {
  background-color: #e8e9ed;
  background-image:
    linear-gradient(45deg, rgba(0,0,0,0.02) 25%, transparent 25%),
    linear-gradient(-45deg, rgba(0,0,0,0.02) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, rgba(0,0,0,0.02) 75%),
    linear-gradient(-45deg, transparent 75%, rgba(0,0,0,0.02) 75%);
}

/* Canvas itself — NO pixelated rendering so shapes look smooth */
#canvas {
  display: block;
  cursor: crosshair;
  width: min(100%, 1400px);
  height: auto;
  aspect-ratio: 1400 / 900;
  margin: 0 auto;
  /* Smooth rendering — no pixel grid artifacts */
  image-rendering: auto;
  image-rendering: -webkit-optimize-contrast;
  /* Canvas has a subtle drop shadow to feel like paper on a desk */
  box-shadow:
    0 0 0 1px rgba(0,0,0,0.4),
    0 4px 32px rgba(0,0,0,0.6),
    0 1px 4px rgba(0,0,0,0.5);
}

#canvas.cursor-pencil  { cursor: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='20' height='20' viewBox='0 0 20 20'%3E%3Cpath d='M14 2l4 4-10 10H4v-4z' fill='%23fff' stroke='%23555' stroke-width='1'/%3E%3C/svg%3E") 0 18, crosshair; }
#canvas.cursor-eraser  { cursor: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24'%3E%3Crect x='2' y='2' width='20' height='20' rx='3' fill='%23fff' fill-opacity='.9' stroke='%23888' stroke-width='1.5'/%3E%3C/svg%3E") 12 12, cell; }
#canvas.cursor-select  { cursor: default; }

/* Zoom bar overlay */
.zoombar {
  position: absolute;
  bottom: 8px;
  right: 10px;
  display: flex;
  align-items: center;
  gap: 7px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r3);
  padding: 5px 10px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.3);
  z-index: 10;
  max-width: calc(100% - 20px);
}
.zoombar label {
  font-size: 10px;
  font-family: var(--font-mono);
  color: var(--text3);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  flex-shrink: 0;
}
.zoombar input[type="range"] { width: 80px; }
.zoom-val {
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--accent);
  min-width: 38px;
  text-align: right;
}
.zoom-icon-btn {
  width: 20px; height: 20px;
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text2);
  border-radius: var(--r1);
  cursor: pointer;
  font-size: 13px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.zoom-icon-btn:hover { background: var(--surface3); color: var(--accent); }

/* Status bar */
.statusbar {
  height: var(--statusbar-h);
  background: var(--surface);
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 10px;
  gap: 8px;
  flex-shrink: 0;
}
.status-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--green);
  flex-shrink: 0;
  transition: background 0.2s;
}
.status-msg {
  font-size: 10.5px;
  font-family: var(--font-mono);
  color: var(--text3);
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ══════════════════════════════════════
   INFO PANEL (slide-in from right)
══════════════════════════════════════ */
.info-panel-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}
.info-panel-overlay.open { opacity: 1; pointer-events: all; }

.info-panel {
  position: fixed;
  top: 0; right: 0;
  width: min(380px, 100vw);
  height: 100vh;
  background: var(--surface);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  z-index: 201;
  transform: translateX(100%);
  transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  overflow-y: auto;
}

@media (max-width: 900px) {
  html, body {
    overflow: auto;
  }

  .app {
    min-height: 100vh;
    height: auto;
    overflow: visible;
  }

  .menubar {
    height: auto;
    min-height: var(--menubar-h);
    flex-wrap: wrap;
    padding: 6px 8px;
  }

  .menubar-center {
    order: 3;
    flex-basis: 100%;
    justify-content: flex-start;
  }

  .toolbar {
    flex-wrap: nowrap;
  }

  .main-body {
    min-height: 0;
  }

  .left-panel {
    width: 190px;
  }

  .zoombar {
    left: 10px;
    right: 10px;
    justify-content: center;
  }
}

@media (max-width: 700px) {
  .main-body {
    flex-direction: column;
    overflow: visible;
  }

  .left-panel {
    width: 100%;
    max-height: 260px;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .canvas-area {
    min-height: 520px;
  }

  #canvas {
    width: 100%;
    max-height: none;
  }
}
.info-panel.open { transform: translateX(0); }

.info-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  position: sticky;
  top: 0;
  background: var(--surface);
  z-index: 1;
}
.info-panel-title { font-size: 14px; font-weight: 600; color: var(--text); }
.info-panel-subtitle { font-size: 11px; color: var(--text3); font-family: var(--font-mono); margin-top: 2px; }
.close-btn {
  width: 28px; height: 28px;
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text2);
  border-radius: var(--r2);
  cursor: pointer;
  font-size: 16px;
  display: flex; align-items: center; justify-content: center;
}
.close-btn:hover { background: var(--red-dim); color: var(--red); border-color: var(--red); }

.info-content { padding: 16px; flex: 1; }
.info-section { margin-bottom: 20px; }
.info-section-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  border-bottom: 1px solid var(--accent-dim);
  padding-bottom: 5px;
  margin-bottom: 10px;
  font-family: var(--font-mono);
}
.info-section p { font-size: 12px; color: var(--text2); line-height: 1.65; margin-bottom: 8px; }
.info-section code {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 1px 5px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
}
.info-table { width: 100%; border-collapse: collapse; font-size: 11px; margin-top: 6px; }
.info-table th {
  text-align: left;
  padding: 4px 8px;
  background: var(--surface2);
  color: var(--text3);
  font-weight: 500;
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border: 1px solid var(--border);
}
.info-table td { padding: 5px 8px; color: var(--text2); border: 1px solid var(--border); vertical-align: top; }
.info-table tr:hover td { background: var(--surface2); }
.algo-tag {
  display: inline-block;
  background: var(--accent-bg);
  border: 1px solid var(--accent-dim);
  color: var(--accent);
  border-radius: 3px;
  padding: 1px 6px;
  font-size: 10px;
  font-family: var(--font-mono);
}
.feature-list { list-style: none; display: flex; flex-direction: column; gap: 4px; }
.feature-list li { display: flex; align-items: flex-start; gap: 8px; font-size: 12px; color: var(--text2); line-height: 1.5; }
.feature-list li::before { content: "▸"; color: var(--accent); flex-shrink: 0; margin-top: 1px; }