body {font-family:'Segoe UI',Arial,sans-serif;margin:0;background:#f9fafb;color:#222;line-height:1.6;}
header {background:#003366;color:#fff;text-align:center;padding:1.5rem;}
nav {background:#0050a0;text-align:center;padding:0.5rem 0;}
nav a {color:#fff;text-decoration:none;margin:0 1rem;font-weight:500;}
main {max-width:1000px;margin:auto;background:#fff;padding:2rem;border-radius:8px;
box-shadow:0 2px 5px rgba(0,0,0,0.1);}
h2,h3,h4{color:#003366;}
footer {text-align:center;background:#003366;color:#fff;padding:1rem;margin-top:2rem;}
pre {white-space: pre-wrap;}
img {max-width:100%;display:block;margin:1rem auto;}