:root {
    --bg-color: #f0f4f8;
    --text-color: #2c3e50;
    --accent-color: #3498db;
    /* Updated to 70% opacity */
    --panel-bg: rgba(255, 255, 255, 0.7);
    --shadow-color: rgba(0, 0, 0, 0.1);
    --border-color: #bdc3c7;
}

body.dark {
    --bg-color: #1a202c;
    --text-color: #e2e8f0;
    --accent-color: #4299e1;
    /* Updated to 70% opacity */
    --panel-bg: rgba(45, 55, 72, 0.7);
    --shadow-color: rgba(0, 0, 0, 0.5);
    --border-color: #4a5568;
}

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

body {
    font-family: 'JetBrains Mono', Consolas, monospace;
    background-color: var(--bg-color);
    color: var(--text-color);
    overflow: hidden;
    width: 100vw;
    height: 100vh;
    user-select: none;
    -webkit-user-select: none;
}

#game-container {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    z-index: 1;
}

/* Three.js canvas styling */
canvas { display: block; outline: none; }

/* UI Overlays */
#ui-layer {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    z-index: 10;
    pointer-events: none;
}

#settings-btn {
    position: absolute; top: 20px; left: 20px;
    pointer-events: auto;
    font-size: 1.5rem; padding: 0.5rem 0.7rem; border: none; border-radius: 8px;
    background-color: var(--panel-bg); color: var(--text-color);
    cursor: pointer; box-shadow: 0 2px 5px var(--shadow-color);
    backdrop-filter: blur(5px);
}

#hud {
    position: absolute; top: 20px; left: 50%; transform: translateX(-50%);
    display: flex; flex-direction: column; align-items: center; gap: 8px;
    color: var(--text-color); text-shadow: 0px 0px 4px var(--bg-color);
}

#score { font-size: 3em; font-weight: 700; white-space: nowrap; }
#server-indicator, #message { font-size: 1.5em; font-weight: bold;}
#debug-info { position: absolute; top: 10px; right: 10px; font-size: 0.9em; opacity: 0.7; display: none; }

#panel {
    position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
    background: var(--panel-bg); backdrop-filter: blur(10px);
    padding: 2rem; border-radius: 12px;
    box-shadow: 0 5px 25px var(--shadow-color);
    display: flex; flex-direction: column; gap: 1.2rem;
    min-width: 400px; z-index: 20;
    pointer-events: auto;
    transition: opacity 0.3s, visibility 0.3s;
}

#panel.hidden { opacity: 0; visibility: hidden; pointer-events: none; }
#panel h2, #panel h3 { text-align: center; margin-bottom: 0.5rem; }

/* New Countdown Style */
#auto-start-counter {
    text-align: center;
    font-size: 0.85em;
    color: var(--accent-color);
    font-weight: bold;
    min-height: 1.2em;
    margin-top: -10px;
}

.control-group { display: flex; justify-content: space-between; align-items: center; }
.radio-group { display: flex; gap: 0.5rem; }
.radio-group input[type="radio"] { display: none; }
.radio-group label {
    padding: 0.5em 1em; border: 1px solid var(--text-color); border-radius: 6px; cursor: pointer;
    transition: 0.2s;
}
.radio-group input[type="radio"]:checked + label {
    background-color: var(--accent-color); color: #fff; border-color: var(--accent-color);
}

.button-group { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-top: 1rem; }
#panel button {
    font-family: inherit; font-size: 1em; padding: 0.8em; border: none; border-radius: 6px;
    cursor: pointer; background-color: var(--accent-color); color: #fff; font-weight: bold;
}
#panel button:active { transform: translateY(2px); }

.separator { height: 1px; background-color: var(--border-color); margin: 0.5rem 0; }
.slider-group { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.slider-group input[type="range"] { flex-grow: 1; }
.slider-group span { font-weight: bold; min-width: 40px; text-align: right; }

select { padding: 4px; border-radius: 4px; border: 1px solid var(--border-color); }
.instructions { text-align: center; font-size: 0.8em; opacity: 0.7; margin-top: 10px;}

@media (max-width: 600px) {
    #panel { min-width: 90%; padding: 1.5rem; }
    #score { font-size: 2em; }
}