:root {
    --bg-color: #1a1a1a;
    --canvas-bg: #111111;
    --controls-bg: #2a2a2a;
    --text-color: #f0f0f0;
    --accent-color: #00aaff;
    --border-color: rgba(255, 255, 255, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
}

.simulation-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    padding: 20px;
    background-color: var(--controls-bg);
    border: 1px solid var(--border-color);
    border-radius: 15px;
}

#pendulumCanvas {
    background-color: var(--canvas-bg);
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.control-panel {
    display: flex;
    gap: 20px;
    align-items: center;
}

.control-group {
    display: flex;
    flex-direction: column;
}

label {
    font-size: 0.9rem;
    color: #a0a0a0;
    margin-bottom: 5px;
}

.slider {
    -webkit-appearance: none;
    width: 150px;
    height: 8px;
    background: #444;
    border-radius: 5px;
    outline: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--accent-color);
    border-radius: 50%;
    cursor: pointer;
}

button {
    padding: 10px 20px;
    border: 1px solid var(--border-color);
    background-color: var(--accent-color);
    color: #fff;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: background-color 0.2s ease;
}

button:hover {
    background-color: #0077b3;
}