:root {
    --bg-color: #f0f2f5;
    --text-color: #1a1a1a;
    --grid-bg: #ffffff;
    --grid-border: #333;
    --highlight-color: #e3f2fd;
    --selection-color: #fff9c4;
    --button-bg: #2196F3;
    --button-text: white;
    --card-bg: #ffffff;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --clue-active-bg: rgba(33, 150, 243, 0.1);
}

[data-theme="dark"] {
    --bg-color: #121212;
    --text-color: #e0e0e0;
    --grid-bg: #1e1e1e;
    --grid-border: #444;
    --highlight-color: #2c3e50;
    --selection-color: #4a4a2d;
    --button-bg: #1565C0;
    --card-bg: #1e1e1e;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
    --clue-active-bg: rgba(21, 101, 192, 0.2);
}

body {
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    overflow: hidden;
    touch-action: none;
}

#game-container {
    background-color: var(--grid-bg);
    border: 1px solid var(--grid-border);
    box-shadow: var(--shadow);
    margin-bottom: 1rem;
    border-radius: 8px;
    overflow: hidden;
    max-width: 100%;
    max-height: 70vh;
}

canvas {
    display: block;
    max-width: 100%;
    height: auto;
}

#ui-overlay {
    width: 90%;
    max-width: 600px;
    padding: 1rem;
    background-color: var(--card-bg);
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    box-shadow: var(--shadow);
    transition: background-color 0.3s, color 0.3s;
}

#clue-display {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

@media (min-width: 600px) {
    #clue-display {
        flex-direction: row;
    }
}

.clue-box {
    flex: 1;
    background: rgba(128, 128, 128, 0.1);
    padding: 0.75rem;
    border-radius: 6px;
    border-left: 4px solid transparent;
    transition: background 0.2s, border-color 0.2s;
}

.clue-box.active {
    background: var(--clue-active-bg);
    border-left-color: var(--button-bg);
}

.clue-box h3 {
    margin: 0 0 0.25rem 0;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    opacity: 0.6;
}

.clue-box p {
    margin: 0;
    font-weight: 500;
    font-size: 0.95rem;
    line-height: 1.4;
}

#controls {
    display: flex;
    gap: 0.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

button {
    background-color: var(--button-bg);
    color: var(--button-text);
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    transition: transform 0.1s, opacity 0.2s;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

button:hover {
    opacity: 0.9;
}

button:active {
    transform: translateY(1px);
}

#theme-toggle {
    background: transparent;
    border: 1px solid var(--text-color);
    color: var(--text-color);
    box-shadow: none;
    padding: 0.75rem 1rem;
}