:root {
    --bg-color: #f0f0f0;
    --container-bg: white;
    --text-color: #333;
    --number-bg: #eee;
    --box-shadow: rgba(0,0,0,0.1);
    --canvas-bg: #000;
}

[data-theme='dark'] {
    --bg-color: #121212;
    --container-bg: #1e1e1e;
    --text-color: #e0e0e0;
    --number-bg: #333;
    --box-shadow: rgba(0,0,0,0.5);
    --canvas-bg: #000;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    background-color: var(--container-bg);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 10px 30px var(--box-shadow);
    text-align: center;
    transition: background-color 0.3s, box-shadow 0.3s;
}

.theme-toggle {
    position: absolute;
    top: 1rem;
    right: 1rem;
}

#toggle-theme {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: background-color 0.2s;
}

#toggle-theme:hover {
    background-color: var(--number-bg);
}

h1 {
    margin-bottom: 1.5rem;
    font-size: 2.5rem;
    letter-spacing: 2px;
}

.game-wrapper {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
    justify-content: center;
}

canvas {
    border: 4px solid var(--text-color);
    background-color: var(--canvas-bg);
    box-shadow: 0 0 20px rgba(0,0,0,0.2);
}

.stats {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    min-width: 150px;
}

.stat-item {
    background: var(--number-bg);
    padding: 1rem;
    border-radius: 10px;
}

.stat-item span {
    display: block;
    font-size: 0.9rem;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
    opacity: 0.8;
}

#score {
    font-size: 2rem;
    font-weight: bold;
}

#start-btn {
    background-color: #4CAF50;
    color: white;
    padding: 1rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: bold;
    transition: transform 0.1s, background-color 0.2s;
}

#start-btn:hover {
    background-color: #45a049;
    transform: scale(1.05);
}

#start-btn:active {
    transform: scale(0.95);
}

.controls-hint {
    text-align: left;
    font-size: 0.85rem;
    opacity: 0.7;
    line-height: 1.6;
}

@media (max-width: 600px) {
    .game-wrapper {
        flex-direction: column;
        align-items: center;
    }
}