:root {
    --bg-color: #f3f4f6;
    --card-bg: #ffffff;
    --text-primary: #1f2937;
    --text-secondary: #4b5563;
    --primary-color: #2563eb;
    --border-color: #e5e7eb;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 2rem 1rem;
}

.container {
    width: 100%;
    max-width: 800px;
}

header {
    text-align: center;
    margin-bottom: 2rem;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.card {
    background-color: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    padding: 3rem;
    margin-bottom: 2rem;
}

section {
    margin-bottom: 2rem;
}

h2 {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
    border-bottom: 2px solid var(--primary-color);
    display: inline-block;
    padding-bottom: 0.25rem;
}

h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

p, li {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-size: 1rem;
}

ul {
    list-style-position: inside;
    margin-bottom: 1rem;
    padding-left: 1rem;
}

hr {
    border: 0;
    border-top: 1px solid var(--border-color);
    margin: 3rem 0;
}

footer {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

@media (max-width: 640px) {
    .card {
        padding: 1.5rem;
    }

    header h1 {
        font-size: 2rem;
    }

    body {
        padding: 1rem;
    }
}