/* style.css */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Roboto, system-ui, sans-serif;
    background: #f5f7fa;
    color: #1e293b;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

nav {
    background: #ffffff;
    padding: 1rem 2rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    display: flex;
    gap: 1.5rem;
    border-bottom: 1px solid #e2e8f0;
}

nav a {
    text-decoration: none;
    color: #475569;
    font-weight: 500;
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    transition: background 0.2s;
}

nav a:hover {
    background: #f1f5f9;
}

nav a.active {
    background: #e2e8f0;
    color: #0f172a;
}

main {
    flex: 1;
    max-width: 720px;
    margin: 3rem auto;
    padding: 0 2rem;
    background: #ffffff;
    border-radius: 16px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.02);
    padding: 2.5rem;
}

h1 {
    margin-bottom: 1.2rem;
    color: #0f172a;
}

p, li {
    line-height: 1.7;
    margin-bottom: 0.8rem;
    color: #334155;
}

ul {
    padding-left: 1.5rem;
}

footer {
    text-align: center;
    padding: 1.5rem;
    color: #94a3b8;
    font-size: 0.9rem;
    border-top: 1px solid #e2e8f0;
    background: #f8fafc;
}