:root {
    --dungeon-bg: #1a001a; /* Dark purple/black */
    --player-color: #50fa7b; /* Neon Green */
    --enemy-color: #ff5555; /* Red */
    --trap-color: #ffb86c; /* Orange */
    --wall-color: #44475a;
}

/* Base Styles */
body, html {
    margin: 0;
    padding: 0;
    background-color: var(--dungeon-bg);
    color: #f8f8f2;
    font-family: sans-serif;
    text-align: center;
}

header {
    margin: 20px 0;
}

/* Controls Panel */
#controls-panel {
    margin-bottom: 20px;
    padding: 15px;
    background-color: #2a2a2a;
    border-radius: 8px;
    display: inline-block;
}

#start-game {
    padding: 10px 20px;
    background-color: var(--player-color);
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    margin-left: 10px;
}

#start-game:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

#audio-status {
    margin-top: 10px;
    font-size: 0.9em;
    color: var(--trap-color);
}

/* --- Dungeon Environment --- */
#game-container {
    display: flex;
    justify-content: center;
    align-items: center;
}

#dungeon-visualizer {
    position: relative;
    width: 600px;
    height: 400px;
    border: 3px solid var(--wall-color);
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
    overflow: hidden;
}

/* Canvas for Frequency Bars */
#frequency-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.3; /* Subtle background visualizer */
    z-index: 10;
}

/* Game Grid (The Play Area) */
#game-grid {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 20;
}

/* Player */
#player {
    position: absolute;
    width: 20px;
    height: 20px;
    background-color: var(--player-color);
    border-radius: 50%;
    top: 50%;
    left: 10%;
    transform: translate(-50%, -50%);
    transition: left 0.1s, top 0.1s;
}

/* Enemies */
.enemy {
    position: absolute;
    width: 15px;
    height: 15px;
    background-color: var(--enemy-color);
    border-radius: 50%;
    transition: left 0.5s, opacity 0.3s;
}

/* Trap Door (The Rhythmic Obstacle) */
#trap-door {
    position: absolute;
    width: 80px;
    height: 400px;
    background-color: var(--trap-color);
    left: 70%;
    top: 0;
    transition: opacity 0.1s;
    border-left: 5px dashed var(--wall-color);
}

#trap-door.open {
    opacity: 0.1; /* Almost invisible, passable */
}

#trap-door.closed {
    opacity: 0.9; /* Solid barrier, impassable */
}

/* Status Area */
#level-status {
    position: absolute;
    bottom: 10px;
    left: 10px;
    text-align: left;
    background-color: rgba(0, 0, 0, 0.5);
    padding: 5px 10px;
    border-radius: 4px;
    font-size: 0.8em;
}

#level-status span {
    font-weight: bold;
    color: var(--player-color);
}