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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
    background-color: #ffffff;
    color: #000000;
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 4rem 2rem;
}

.navbar {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.navbar a {
    text-decoration: none;
    color: #4b5563;
    font-weight: 600;
    font-size: 1rem;
    transition: color 0.2s ease;
}

.navbar a:hover {
    color: #111827;
}

.navbar a.active {
    color: #111827;
    border-bottom: 2px solid #111827;
    padding-bottom: 0.25rem;
}

header {
    text-align: left;
    margin-bottom: 3rem;
    border-bottom: 1px solid #e5e7eb;
    padding-bottom: 1.5rem;
}

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

.subtitle {
    font-size: 1.25rem;
    color: #4b5563;
    font-weight: 400;
}

section {
    margin-bottom: 2.5rem;
}

h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: #111827;
}

p {
    margin-bottom: 1rem;
    color: #374151;
}

ul {
    list-style: disc;
    padding-left: 1.5rem;
    color: #374151;
    margin-bottom: 1rem;
}

li {
    margin-bottom: 0.5rem;
}

li strong {
    color: #111827;
}

footer {
    text-align: left;
    margin-top: 4rem;
    border-top: 1px solid #e5e7eb;
    padding-top: 2rem;
    color: #6b7280;
    font-size: 0.875rem;
}

@media (max-width: 640px) {
    .container {
        padding: 2rem 1rem;
    }
    
    h1 {
        font-size: 2rem;
    }
}