:root {
    --bg-color: #f8f9fa;
    --text-color: #212529;
    --accent-color: #495057;
    --link-color: #0d6efd;
    --card-bg: #ffffff;
    --border-color: #dee2e6;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #212529;
        --text-color: #f8f9fa;
        --accent-color: #adb5bd;
        --link-color: #6ea8fe;
        --card-bg: #343a40;
        --border-color: #495057;
    }
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    line-height: 1.6;
}

.container {
    max-width: 600px;
    width: 100%;
    padding: 2rem;
    margin: 1rem;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

p.tagline {
    color: var(--accent-color);
    font-size: 1.2rem;
}

.card {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--border-color);
    margin-bottom: 2rem;
}

h2 {
    font-size: 1.5rem;
    margin-top: 0;
}

ul {
    list-style-type: none;
    padding: 0;
}

li {
    margin-bottom: 1rem;
}

a {
    color: var(--link-color);
    text-decoration: none;
    font-weight: 500;
    transition: opacity 0.2s;
}

a:hover {
    opacity: 0.8;
    text-decoration: underline;
}

footer {
    text-align: center;
    color: var(--accent-color);
    font-size: 0.9rem;
}