*{box-sizing:border-box}
body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:#1f2937;line-height:1.6}
header,main,footer{max-width:900px;margin:0 auto;padding:20px}
header{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:10px}
header a.brand{font-weight:700;font-size:1.3rem;color:#0f766e;text-decoration:none}
nav a{margin-left:16px;color:#374151;text-decoration:none}
nav a:hover{color:#0f766e}
.hero{padding:40px 0}
.hero h1{font-size:2.2rem;margin:0 0 12px}
.btn{display:inline-block;background:#0f766e;color:#fff;padding:10px 20px;border-radius:6px;text-decoration:none}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px}
.card{border:1px solid #e5e7eb;border-radius:8px;padding:16px}
footer{border-top:1px solid #e5e7eb;margin-top:40px;font-size:.9rem;color:#4b5563}