* { margin: 0; padding: 0; box-sizing: border-box; }
body { overflow: hidden; background: var(--body-bg, #000); }
canvas { display: block; }

#back {
  position: fixed;
  top: 12px;
  left: 14px;
  color: rgba(255,255,255,0.6);
  text-decoration: none;
  font: 13px monospace;
  background: rgba(0,0,0,0.45);
  padding: 4px 10px;
  border-radius: 6px;
  z-index: 10;
}
#back:hover { color: white; }

#panel {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.96);
  border-top: 3px solid var(--theme);
  box-shadow: 0 -4px 24px rgba(0,0,0,0.18);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  transition: transform 0.3s ease;
  z-index: 10;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  height: 427px;
}
#panel.collapsed { transform: translateY(calc(100% - 42px)); }

#panel-handle {
  height: 8px;
  cursor: ns-resize;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
#panel-handle::before {
  content: '';
  width: 36px;
  height: 3px;
  background: #cbd5e0;
  border-radius: 2px;
}
#panel-handle:hover::before { background: #a0aec0; }

#panel-bar {
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 14px;
}
#panel-bar-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: #2d3748;
}
#panel-toggle {
  background: none;
  border: 1px solid #e2e8f0;
  border-radius: 6px;
  cursor: pointer;
  font: 12px monospace;
  color: #718096;
  padding: 3px 9px;
}
#panel-toggle:hover { background: #f7fafc; }

#panel-body {
  padding: 0 16px 16px;
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-height: 0;
}

#panel-hint {
  font-size: 0.8rem;
  color: #2c5282;
  background: #ebf8ff;
  border: 1px solid #bee3f8;
  border-radius: 6px;
  padding: 6px 10px;
  margin-bottom: 8px;
  flex-shrink: 0;
}

#editor {
  width: 100%;
  flex: 1;
  min-height: 80px;
  font: 13px/1.6 monospace;
  background: #1a202c;
  color: #e2e8f0;
  border: 1px solid #4a5568;
  border-radius: 8px;
  padding: 10px 12px;
  resize: none;
  outline: none;
  tab-size: 2;
  -moz-tab-size: 2;
}
#btn-row { display: flex; gap: 8px; margin-top: 10px; align-items: center; }
#run-btn {
  background: var(--theme);
  color: var(--theme-text);
  border: none;
  border-radius: 8px;
  padding: 8px 18px;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
}
#run-btn:hover { background: var(--theme-hover); color: white; }
#stop-btn {
  background: #e2e8f0;
  color: #4a5568;
  border: none;
  border-radius: 8px;
  padding: 8px 14px;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
}
#stop-btn:hover { background: #cbd5e0; }
#error { margin-top: 6px; font: 12px/1.4 monospace; color: #e53e3e; min-height: 16px; }
#print-btn {
  background: var(--theme);
  color: var(--theme-text);
  border: none;
  border-radius: 8px;
  padding: 8px 18px;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
}
#print-btn:hover { background: var(--theme-hover); color: white; }