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

:root {
  --bg: #1a1a2e;
  --accent: #00d4ff;
  --accent-red: #ff4444;
  --text: #eee;
  --toolbar-bg: rgba(20, 20, 40, 0.9);
}

body {
  overflow: hidden;
  background: var(--bg);
  font-family: 'Segoe UI', sans-serif;
  color: var(--text);
}

#game-canvas {
  display: block;
  width: 100vw;
  height: 100vh;
  cursor: crosshair;
}

#ui-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
}

.ui-screen { display: none; }
.ui-screen.active { display: block; }
.ui-screen > * { pointer-events: auto; }

/* Menu */
#screen-menu {
  display: none;
  position: absolute;
  inset: 0;
  background: var(--bg);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  pointer-events: auto;
}
#screen-menu.active { display: flex; }

#screen-menu h1 {
  font-size: 3.5rem;
  color: var(--accent);
  margin-bottom: 40px;
  text-shadow: 0 0 30px rgba(0, 212, 255, 0.5);
}

.menu-buttons { display: flex; flex-direction: column; gap: 16px; }

button {
  padding: 10px 24px;
  font-size: 1rem;
  border: 2px solid var(--accent);
  background: transparent;
  color: var(--text);
  cursor: pointer;
  border-radius: 4px;
  transition: all 0.2s;
}
button:hover { background: var(--accent); color: #111; }

/* Toolbar */
#toolbar {
  position: absolute;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 12px;
  padding: 8px 16px;
  background: var(--toolbar-bg);
  border-radius: 8px;
  border: 1px solid #333;
}

.tool-group, .line-type-group, .action-group {
  display: flex;
  gap: 4px;
}

.tool-group { border-right: 1px solid #444; padding-right: 12px; }
.line-type-group { border-right: 1px solid #444; padding-right: 12px; }

#toolbar button {
  padding: 6px 10px;
  font-size: 1.1rem;
  border: 1px solid transparent;
  min-width: 36px;
}

.tool-btn.active { border-color: var(--accent); background: rgba(0, 212, 255, 0.15); }
.line-type-btn.active { border-color: var(--accent); background: rgba(0, 212, 255, 0.15); }

#editor-info {
  position: absolute;
  bottom: 10px;
  left: 10px;
  display: flex;
  gap: 16px;
  padding: 6px 12px;
  background: var(--toolbar-bg);
  border-radius: 4px;
  font-size: 0.8rem;
  color: #888;
}

/* Play HUD */
#play-hud {
  position: absolute;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 24px;
  padding: 8px 20px;
  background: var(--toolbar-bg);
  border-radius: 8px;
  font-size: 1.2rem;
}

#btn-stop {
  position: absolute;
  top: 10px;
  right: 10px;
  font-size: 0.85rem;
}

/* Result */
#result-panel {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  background: var(--toolbar-bg);
  padding: 30px 50px;
  border-radius: 12px;
  border: 1px solid #333;
}

#result-panel h2 { margin-bottom: 12px; color: var(--accent-red); }
#result-panel p { margin-bottom: 8px; color: #aaa; }
#result-panel button { margin: 8px 6px 0; }

/* Canvas states */
body.playing #game-canvas { cursor: default; }
body.menu #game-canvas { cursor: default; }

/* Animations */
#screen-menu h1 {
  animation: glow 3s ease-in-out infinite;
}

@keyframes glow {
  0%, 100% { text-shadow: 0 0 30px rgba(0, 212, 255, 0.5); }
  50% { text-shadow: 0 0 60px rgba(0, 212, 255, 0.8), 0 0 90px rgba(0, 212, 255, 0.3); }
}

#toolbar {
  animation: slideDown 0.3s ease;
}

@keyframes slideDown {
  from { transform: translateX(-50%) translateY(-20px); opacity: 0; }
  to { transform: translateX(-50%) translateY(0); opacity: 1; }
}

#result-panel {
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translate(-50%, -50%) scale(0.95); }
  to { opacity: 1; transform: translate(-50%, -50%) scale(1); }
}