:root {
    --primary-color: #ff4500;
    --secondary-color: #1e90ff;
    --background-color: #f0f8ff;
    --text-color: #333;
    --card-background: #ffffff;
    --header-text: #ffffff;
}

[data-theme='dark'] {
    --primary-color: #cc3700;
    --secondary-color: #1a74cc;
    --background-color: #121212;
    --text-color: #e0e0e0;
    --card-background: #1e1e1e;
    --header-text: #ffffff;
}

body {
    font-family: 'Arial', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    transition: background-color 0.3s, color 0.3s;
}

header {
    background-color: var(--primary-color);
    color: var(--header-text);
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

header h1 {
    margin: 0;
}

#theme-toggle {
    background: none;
    border: 2px solid var(--header-text);
    color: var(--header-text);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    font-weight: bold;
    transition: background 0.2s, color 0.2s;
}

#theme-toggle:hover {
    background: var(--header-text);
    color: var(--primary-color);
}

main {
    padding: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: calc(100vh - 160px);
}

section {
    background-color: var(--card-background);
    border-radius: 8px;
    padding: 2rem;
    margin: 1rem;
    width: 80%;
    max-width: 800px;
    box-shadow: 0 8px 16px rgba(0,0,0,0.2);
    transition: background-color 0.3s;
}

footer {
    text-align: center;
    padding: 1rem;
    background-color: var(--primary-color);
    color: var(--header-text);
    width: 100%;
    margin-top: auto;
}