:root {
  --fond: #f4f5fa; --carte: #ffffff; --texte: #1b1f3b; --discret: #6b7090; --accent: #00a651;
  --bord: #d9dcea; --erreur: #c62828;
}
@media (prefers-color-scheme: dark) {
  :root { --fond: #12142a; --carte: #1b1f3b; --texte: #eceefb; --discret: #9aa0c4; --bord: #343964; --erreur: #ff8a80; }
}
* { box-sizing: border-box; }
body {
  margin: 0; min-height: 100vh; display: grid; place-items: center; padding: 16px;
  background: var(--fond); color: var(--texte); font: 16px/1.5 system-ui, "Segoe UI", sans-serif;
}
.carte {
  width: 100%; max-width: 420px; background: var(--carte); border: 1px solid var(--bord);
  border-radius: 14px; padding: 28px 24px;
}
h1 { margin: 0 0 18px; font-size: 22px; font-weight: 500; text-align: center; }
h1 b { color: var(--accent); }
label { display: block; margin: 12px 0 4px; font-size: 14px; color: var(--discret); }
input {
  width: 100%; padding: 10px 12px; font-size: 18px; border: 1px solid var(--bord); border-radius: 8px;
  background: transparent; color: inherit;
}
input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
button {
  margin-top: 16px; padding: 10px 18px; font-size: 16px; border: 0; border-radius: 8px;
  background: var(--accent); color: #fff; cursor: pointer;
}
button:disabled { opacity: .6; cursor: default; }
button.lien { background: none; color: var(--discret); text-decoration: underline; padding: 10px 8px; }
.petit { font-size: 13px; color: var(--discret); }
code, pre { font-family: Consolas, monospace; word-break: break-all; }
pre { padding: 12px; border: 1px solid var(--bord); border-radius: 8px; font-size: 16px; line-height: 1.8; }
img#qr { display: block; margin: 8px auto; background: #fff; padding: 8px; border-radius: 8px; }
#message { margin-top: 16px; color: var(--erreur); font-size: 14px; }
#message.ok { color: var(--accent); }
[hidden] { display: none !important; }