:root {
    --background-color: #1a1a1a;
    --text-color: #ffffff;
    --accent-color: #ff9800;
    --card-background: #2c2c2c;
}

[data-theme="light"] {
    --background-color: #ffffff;
    --text-color: #1a1a1a;
    --accent-color: #ff9800;
    --card-background: #f0f0f0;
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    transition: background-color 0.3s, color 0.3s;
}

.theme-toggle {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: 2px solid var(--text-color);
    color: var(--text-color);
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    background-color: var(--text-color);
    color: var(--background-color);
}