/* Auto-theme using prefers-color-scheme */
:root {
    --bg: #ffffff;
    --text: #222222;
    --card: #f4f4f4;
    --button-bg: #0078ff;
    --button-text: #ffffff;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0d1117;
        --text: #e6edf3;
        --card: #161b22;
        --button-bg: #238636;
        --button-text: #ffffff;
    }
}

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

.container {
    text-align: center;
    padding: 2rem;
    max-width: 600px;
}

h1 {
    margin-bottom: 0.25rem;
    font-size: 2.5rem;
}

.tagline {
    opacity: 0.8;
    margin-bottom: 2rem;
}

.links {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.button {
    display: block;
    padding: 0.75rem 1rem;
    background: var(--button-bg);
    color: var(--button-text);
    text-decoration: none;
    border-radius: 8px;
    font-size: 1.1rem;
    transition: opacity 0.2s ease;
}

.button:hover {
    opacity: 0.85;
}

footer {
    opacity: 0.6;
    font-size: 0.9rem;
}