body {
    margin: 0;
    background-color: #e2e8f0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    font-family: sans-serif;
    overflow: hidden;
    user-select: none;
}
.game-container {
    display: flex;
    gap: 20px;
    background: #ffffff;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 15px 35px rgba(0,0,0,0.1);
}
canvas {
    background-color: #f5f6fa;
    border: 2px solid #bdc3c7;
    border-radius: 6px;
    cursor: pointer;
}
.editor-panel {
    width: 280px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.editor-panel h3, .editor-panel h4 { margin: 0; color: #2c3e50; }
.hint { font-size: 11px; color: #7f8c8d; margin: 0; line-height: 1.3; }
.control-group { display: flex; align-items: center; justify-content: space-between; gap: 8px; font-size: 13px; }
.control-group label { flex: 1; font-weight: bold; color: #34495e; }
input[type="number"], select { width: 80px; padding: 5px; border-radius: 4px; border: 1px solid #bdc3c7; text-align: center; }
.btn-row { display: flex; gap: 8px; }
.btn {
    padding: 10px;
    border: none;
    border-radius: 6px;
    font-weight: bold;
    cursor: pointer;
    text-align: center;
}
.small-btn { padding: 6px 10px; font-size: 12px; }
.primary { background: #9b59b6; color: white; }
.primary:hover { background: #8e44ad; }
.success { background: #2ecc71; color: white; }
.danger { background: #e74c3c; color: white; }
.mode-btn { background: #3498db; color: white; width: 100%; }
.mode-btn:hover { background: #2980b9; }
textarea { width: 100%; height: 60px; font-family: monospace; font-size: 10px; border-radius: 4px; border: 1px solid #dcdde1; resize: none; box-sizing: border-box; padding: 4px; }
hr { border: 0; border-top: 1px solid #ecf0f1; margin: 3px 0; }