:root {
  --bg: #0f1419;
  --carte: #171e26;
  --bord: #26313d;
  --texte: #e6edf3;
  --dim: #8b9bab;
  --accent: #4ade80;
}
* { box-sizing: border-box; }
body {
  margin: 0; min-height: 100vh; background: var(--bg); color: var(--texte);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
  display: grid; place-items: center; padding: 24px;
}
main { width: 100%; max-width: 780px; }
h1 { font-size: 32px; margin: 0 0 4px; letter-spacing: -0.02em; }
.sub { color: var(--dim); font-size: 14px; margin: 0 0 28px; }
form { display: grid; grid-template-columns: 1fr 1fr 1fr auto; gap: 12px; align-items: end; }
label { display: grid; gap: 6px; font-size: 12px; color: var(--dim); text-transform: uppercase; letter-spacing: .06em; }
input, select, button {
  font: inherit; font-size: 15px; padding: 11px 12px; border-radius: 8px;
  border: 1px solid var(--bord); background: var(--carte); color: var(--texte);
}
input:focus, select:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
button {
  background: var(--accent); color: #06210f; font-weight: 600; cursor: pointer;
  border-color: transparent; padding-inline: 20px;
}
button:hover { filter: brightness(1.08); }
.cartes { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 28px; }
.carte { background: var(--carte); border: 1px solid var(--bord); border-radius: 12px; padding: 20px; }
.carte h2 { font-size: 15px; margin: 0 0 10px; color: var(--dim); font-weight: 500; }
.prix { font-size: 34px; font-weight: 700; margin: 0; letter-spacing: -0.02em; }
.meta { font-size: 12px; color: var(--dim); margin: 10px 0 0; line-height: 1.6; }
.delta {
  margin-top: 20px; padding: 14px 16px; border-radius: 10px;
  background: #14261c; border: 1px solid #1f4230; font-size: 15px;
}
.erreur { margin-top: 20px; padding: 12px 16px; border-radius: 10px; background: #2a1618; border: 1px solid #5a2328; color: #ffb3ba; }
@media (max-width: 640px) {
  form { grid-template-columns: 1fr 1fr; }
  .cartes { grid-template-columns: 1fr; }
}