:root {
  --bg: #14162b;
  --panel: #1f2340;
  --accent: #7c5cff;
  --accent-2: #34d1a5;
  --danger: #ff6b6b;
  --text: #eef0ff;
  --muted: #9ba0c9;
  --wall: #3a3f6b;
  --floor: #262a4d;
  --goal: #34d1a5;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top, #21254a 0%, var(--bg) 65%);
  color: var(--text);
  min-height: 100vh;
}

.hidden { display: none !important; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 20px 28px;
}

.topbar h1 { margin: 0; font-size: 1.6rem; }

.level-picker { display: flex; align-items: center; gap: 10px; }
#level-buttons { display: flex; gap: 6px; flex-wrap: wrap; }

.level-btn {
  border: none;
  background: var(--panel);
  color: var(--muted);
  padding: 8px 14px;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 600;
}
.level-btn.active { background: var(--accent); color: white; }
.level-btn.solved { color: var(--accent-2); }
.level-btn.solved::after { content: " ✓"; }

.layout {
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: 24px;
  padding: 0 28px 40px;
  max-width: 1200px;
  margin: 0 auto;
}

@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; padding: 0 16px 32px; }
  .topbar { padding: 16px; }
}

.board-panel, .code-panel {
  background: var(--panel);
  border-radius: 18px;
  padding: 20px;
}

.level-title { margin: 0 0 4px; font-size: 1.15rem; }
.mission { color: var(--muted); margin: 0 0 14px; }

.grid {
  display: grid;
  grid-template-columns: repeat(var(--cols, 8), 1fr);
  gap: 3px;
  aspect-ratio: var(--cols, 8) / var(--rows, 8);
  width: 100%;
  max-width: 520px;
  margin: 0 auto 16px;
}

.cell {
  background: var(--floor);
  border-radius: 5px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(0.8rem, 3vw, 1.3rem);
  transition: background 0.15s ease;
  position: relative;
}
.cell.wall { background: var(--wall); }
.cell.goal { background: var(--goal); }
.cell.robot { background: #2f3568; }
.dir-arrow {
  display: inline-block;
  font-size: clamp(0.9rem, 3.2vw, 1.5rem);
  color: var(--accent-2);
}
.dir-arrow.dir-leste { transform: rotate(0deg); }
.dir-arrow.dir-sul { transform: rotate(90deg); }
.dir-arrow.dir-oeste { transform: rotate(180deg); }
.dir-arrow.dir-norte { transform: rotate(-90deg); }
.cell.visited::after {
  content: "";
  width: 6px; height: 6px; border-radius: 50%;
  background: rgba(124,92,255,0.6);
}

.board-controls { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }

.btn {
  border: none;
  background: #2c3057;
  color: var(--text);
  padding: 10px 16px;
  border-radius: 10px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.95rem;
}
.btn:hover { filter: brightness(1.15); }
.btn:disabled { opacity: 0.5; cursor: default; }
.btn-primary { background: var(--accent); }
.btn-mentor { background: #3a4b8f; margin-top: 10px; width: 100%; }
.btn-next { background: var(--accent-2); color: #0f1128; margin-top: 12px; width: 100%; font-size: 1.05rem; }

.steps { color: var(--muted); font-size: 0.85rem; margin-left: auto; }

.status { color: var(--muted); font-size: 0.95rem; min-height: 1.4em; margin: 12px 0 0; }
.status.win { color: var(--accent-2); font-weight: 700; }
.status.fail { color: var(--danger); font-weight: 700; }

.code-panel h2 { margin-top: 0; font-size: 1.1rem; }

#code {
  width: 100%;
  min-height: 260px;
  background: #0f1128;
  color: #d7f9e9;
  border: 1px solid #363b6b;
  border-radius: 10px;
  padding: 14px;
  font-family: "SF Mono", Menlo, monospace;
  font-size: 0.95rem;
  line-height: 1.45;
  resize: vertical;
}

.help { margin-top: 12px; color: var(--muted); font-size: 0.9rem; }
.help ul { padding-left: 18px; }
.help li { margin-bottom: 4px; }
.help code { color: var(--accent-2); }

.mentor {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin-top: 18px;
}
.mentor-avatar { font-size: 1.8rem; }
.mentor-bubble {
  background: #0f1128;
  border-radius: 12px;
  padding: 12px 14px;
  font-size: 0.9rem;
  color: #d9dcff;
  flex: 1;
  min-height: 2.6em;
}