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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", sans-serif;
  background: #0a0a1a;
  color: #e0e0e0;
  min-height: 100vh;
}

#app { max-width: 1400px; margin: 0 auto; padding: 12px; }

/* Header */
#header {
  text-align: center;
  padding: 16px 0 12px;
  border-bottom: 1px solid #1e3a5f;
  margin-bottom: 16px;
}
#header h1 {
  font-size: 1.6rem;
  background: linear-gradient(135deg, #00d4ff, #00ff88);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.subtitle { font-size: 0.85rem; color: #6b7b8d; margin-top: 4px; }

/* Main Layout */
#mainLayout {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

/* Maze Section */
#mazeSection {
  flex: 1;
  min-width: 0;
}
#canvasContainer {
  background: #111128;
  border: 1px solid #1e3a5f;
  border-radius: 8px;
  padding: 8px;
  overflow: auto;
  display: flex;
  justify-content: center;
}
#mazeCanvas { display: block; border-radius: 4px; }
#stepInfo {
  margin-top: 8px;
  font-size: 0.85rem;
  color: #8ab4f8;
  font-family: "Consolas", "Courier New", monospace;
}
#statBar { font-size: 0.8rem; color: #6b7b8d; margin-top: 4px; }
#solvedLabel { font-size: 0.9rem; font-weight: bold; margin-top: 4px; }

/* Control Panel */
#controlPanel {
  width: 320px;
  flex-shrink: 0;
  background: #111128;
  border: 1px solid #1e3a5f;
  border-radius: 8px;
  padding: 16px;
}
.panel-section {
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid #1a1a3e;
}
.panel-section:last-child { border-bottom: none; margin-bottom: 0; }
.panel-section h3 {
  font-size: 0.8rem;
  color: #6b7b8d;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 8px;
}

/* Algorithm Selector */
.algo-selector { display: flex; gap: 8px; }
.algo-btn {
  flex: 1;
  padding: 10px;
  background: #1a1a3e;
  border: 1px solid #2a2a5e;
  border-radius: 6px;
  color: #8ab4f8;
  cursor: pointer;
  font-size: 0.85rem;
  transition: all 0.2s;
}
.algo-btn:hover { background: #2a2a5e; }
.algo-btn.active {
  background: #0d3b66;
  border-color: #00d4ff;
  color: #00d4ff;
  box-shadow: 0 0 12px rgba(0, 212, 255, 0.2);
}
.algo-btn small { font-size: 0.7rem; opacity: 0.7; }

/* Size Controls */
.size-controls { display: flex; gap: 8px; margin-bottom: 8px; }
.size-controls label { flex: 1; font-size: 0.8rem; color: #8ab4f8; }
.size-controls input {
  width: 100%;
  padding: 4px 8px;
  background: #1a1a3e;
  border: 1px solid #2a2a5e;
  border-radius: 4px;
  color: #e0e0e0;
  font-size: 0.85rem;
  margin-top: 4px;
}
.size-presets { display: flex; gap: 6px; flex-wrap: wrap; }
.size-preset {
  padding: 4px 10px;
  background: #1a1a3e;
  border: 1px solid #2a2a5e;
  border-radius: 4px;
  color: #8ab4f8;
  cursor: pointer;
  font-size: 0.75rem;
  transition: all 0.2s;
}
.size-preset:hover { background: #2a2a5e; border-color: #00d4ff; }

/* Speed Control */
.speed-control { display: flex; align-items: center; gap: 8px; }
.speed-control input { flex: 1; accent-color: #00d4ff; }
#speedVal { font-size: 0.8rem; color: #00d4ff; min-width: 40px; text-align: right; }

/* Buttons */
.actions { display: flex; gap: 8px; flex-wrap: wrap; }
.actions .btn { flex: 1; min-width: 80px; }
.btn {
  padding: 10px 14px;
  border: 1px solid #2a2a5e;
  border-radius: 6px;
  background: #1a1a3e;
  color: #8ab4f8;
  cursor: pointer;
  font-size: 0.85rem;
  transition: all 0.2s;
  text-align: center;
}
.btn:hover { background: #2a2a5e; }
.btn.primary { border-color: #0d3b66; background: #0d3b66; color: #00d4ff; }
.btn.primary:hover { background: #0f4a7a; box-shadow: 0 0 10px rgba(0, 212, 255, 0.3); }
.btn.accent { background: #006644; border-color: #00ff88; color: #00ff88; }
.btn.accent:hover { background: #008855; box-shadow: 0 0 10px rgba(0, 255, 136, 0.3); }

/* Stats */
.stats-grid { display: flex; flex-direction: column; gap: 6px; }
.stat-item {
  display: flex;
  justify-content: space-between;
  padding: 6px 10px;
  background: #0a0a1a;
  border-radius: 4px;
}
.stat-label { color: #6b7b8d; font-size: 0.8rem; }
.stat-value { color: #00d4ff; font-family: "Consolas", monospace; font-size: 0.9rem; }

/* Algorithm Description */
#algoDesc {
  font-size: 0.78rem;
  line-height: 1.6;
  color: #8ab4f8;
  white-space: pre-wrap;
  font-family: inherit;
  background: #0a0a1a;
  padding: 10px;
  border-radius: 4px;
  border: 1px solid #1a1a3e;
}

/* Text Section */
#textSection { margin-top: 16px; }
#textSection h3 { font-size: 0.85rem; color: #6b7b8d; margin-bottom: 4px; }
#textSection .hint { font-size: 0.75rem; color: #4a5a6d; margin-bottom: 6px; }
#textOutput {
  width: 100%;
  height: 120px;
  background: #0a0a1a;
  border: 1px solid #1e3a5f;
  border-radius: 6px;
  color: #8ab4f8;
  font-family: "Consolas", "Courier New", monospace;
  font-size: 0.75rem;
  padding: 10px;
  resize: vertical;
  line-height: 1.4;
}

/* Footer */
#footer {
  text-align: center;
  padding: 20px 0;
  color: #4a5a6d;
  font-size: 0.75rem;
  border-top: 1px solid #1a1a3e;
  margin-top: 20px;
}

/* Responsive */
@media (max-width: 800px) {
  #mainLayout { flex-direction: column; }
  #controlPanel { width: 100%; }
  .size-controls { flex-direction: row; }
}