:root{--bleu:#12345a;--accent:#0a7d6b;--bg:#f5f7fa;--fic:#b23a1e}
*{box-sizing:border-box}
body{font-family:system-ui,Segoe UI,Roboto,sans-serif;margin:0;color:#1a1a1a;background:var(--bg);line-height:1.55}
.bandeau-fictif{background:var(--fic);color:#fff;text-align:center;padding:.5rem 1rem;font-weight:600;font-size:.9rem}
header{background:var(--bleu);color:#fff;padding:1.2rem 2rem}
header h1{margin:0 0 .4rem}
nav a{color:#cfe3ff;text-decoration:none;margin-right:.3rem}
nav a:hover{text-decoration:underline}
main{max-width:900px;margin:0 auto;padding:2rem}
h2{color:var(--bleu)}
.card{background:#fff;border:1px solid #dde3ea;border-radius:8px;padding:1.2rem 1.5rem;margin:1rem 0}
footer{max-width:900px;margin:2rem auto;padding:1.5rem 2rem;color:#555;font-size:.85rem;border-top:1px solid #dde3ea}
code{background:#eef2f6;padding:.1rem .3rem;border-radius:4px}
table{border-collapse:collapse;width:100%}
td,th{border:1px solid #dde3ea;padding:.4rem .6rem;text-align:left}