/* Define CSS variables for theming */
:root {
    /* Default: Light Mode */
    --bg-color: #f0f0f0;
    --text-color: #333;
    --container-bg: white;
    --container-border: #ccc;
    --container-shadow: rgba(0,0,0,0.1);
    --secondary-border-color: #ddd; /* For dashed border, hint border */
    --led-bg: white;
    --led-border: black;
    --hint-text-color: #666;
    --toggle-button-bg: #e9e9e9;
    --toggle-button-text: #333;
    --toggle-button-border: #ccc;
    --led-active-bg: red;
}

body.dark-mode {
    /* Dark Mode Overrides */
    --bg-color: #121212;
    --text-color: #e0e0e0;
    --container-bg: #1e1e1e;
    --container-border: #333;
    --container-shadow: rgba(255,255,255,0.05);
    --secondary-border-color: #2a2a2a;
    --led-bg: #2c2c2c;
    --led-border: #777;
    --hint-text-color: #aaa;
    --toggle-button-bg: #3a3a3a;
    --toggle-button-text: #e0e0e0;
    --toggle-button-border: #555;
}

body {
    font-family: Arial, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    padding-top: 20px;
    transition: background-color 0.3s, color 0.3s;
}

#themeToggle {
    position: absolute;
    top: 15px;
    right: 15px;
    padding: 8px 12px;
    border-radius: 5px;
    cursor: pointer;
    background-color: var(--toggle-button-bg);
    color: var(--toggle-button-text);
    border: 1px solid var(--toggle-button-border);
    font-size: 0.9em;
    z-index: 100;
    transition: background-color 0.3s, color 0.3s, border-color 0.3s;
}

#game-container {
    width: 800px;
    min-height: 600px;
    background-color: var(--container-bg);
    border: 1px solid var(--container-border);
    box-shadow: 0 0 10px var(--container-shadow);
    padding: 20px;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    margin-top: 10px;
}

#stats-area p {
    margin: 5px 0;
    font-size: 14px;
    color: var(--text-color);
}

#visual-led-area {
    display: flex;
    justify-content: space-around;
    align-items: center;
    margin: 40px 0;
    padding: 20px;
    border: 1px dashed var(--secondary-border-color);
    min-height: 150px;
}

.led-button-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.led-visual {
    width: 100px;
    height: 100px;
    background-color: var(--led-bg);
    border: 5px solid var(--led-border);
    border-radius: 50%;
    transition: background-color 0.1s ease-in-out, border-color 0.1s ease-in-out;
    cursor: pointer;
}

.led-visual.active {
    background-color: var(--led-active-bg);
}

#message-area {
    margin-top: 20px;
    text-align: center;
    font-size: 18px;
    min-height: 50px;
    color: var(--text-color);
}

#message-area #pause-message {
    font-weight: bold;
}

#hint-area {
    margin-top: auto;
    padding-top: 20px;
    border-top: 1px solid var(--secondary-border-color);
    font-size: 12px;
    color: var(--hint-text-color);
}

#hint-area p {
    margin: 2px 0;
}