/* Style minimal pour la calculatrice */
html,body{height:100%;margin:0;font-family:Arial,Helvetica,sans-serif;background:#f3f3f3}
.calculator{width:260px;margin:60px auto;padding:12px;background:#fff;border-radius:8px;box-shadow:0 6px 18px rgba(0,0,0,0.08)}
.display{width:100%;height:48px;font-size:20px;padding:8px;border:1px solid #ddd;border-radius:6px;margin-bottom:10px;box-sizing:border-box;text-align:right}
.buttons{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.btn{height:48px;font-size:18px;border:0;border-radius:6px;background:#e9e9e9;cursor:pointer}
.btn:hover{background:#dfdfdf}
.btn.clear{grid-column:1 / -1;background:#ff6b6b;color:#fff}
.btn.clear:hover{opacity:0.95}