:root {
    --primary-color: #007AFF;
    --background-color: #f5f5f7;
    --card-background: #ffffff;
    --text-primary: #1d1d1f;
    --text-secondary: #86868b;
    --border-radius: 12px;
    --spacing: 20px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --background-color: #000000;
        --card-background: #1c1c1e;
        --text-primary: #f5f5f7;
        --text-secondary: #86868b;
    }
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 20px;
}

header {
    text-align: center;
    margin-bottom: 60px;
}

h1 {
    font-size: 40px;
    font-weight: 700;
    margin-bottom: 10px;
}

h2 {
    font-size: 24px;
    font-weight: 600;
    margin-top: 40px;
    margin-bottom: 20px;
}

.card {
    background-color: var(--card-background);
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
    margin-bottom: 20px;
}

.footer {
    text-align: center;
    margin-top: 60px;
    color: var(--text-secondary);
    font-size: 14px;
}

a {
    color: var(--primary-color);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.button {
    display: inline-block;
    background-color: var(--primary-color);
    color: white;
    padding: 12px 24px;
    border-radius: 20px;
    font-weight: 600;
    margin-top: 20px;
}

.button:hover {
    color: white;
    opacity: 0.9;
    text-decoration: none;
}