:root {
  --encre: #1b1b1b;
  --fond: #fbfaf8;
  --bord: #d8d4cc;
  --accent: #2f5d50;
  --alerte: #a32b1e;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--fond);
  color: var(--encre);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 18px;
  line-height: 1.6;
}

.bandeau {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--bord);
  background: #fff;
}

.marque { font-weight: 700; font-size: 20px; letter-spacing: .06em; color: var(--encre); text-decoration: none; }

main { max-width: 34rem; margin: 0 auto; padding: 28px 20px 64px; }

h1 { font-size: 1.6rem; margin: 0 0 8px; }

.aide { color: #5c5750; margin-top: 0; }

.formulaire { display: flex; flex-direction: column; gap: 6px; margin-top: 20px; }

label { font-weight: 600; margin-top: 14px; }

input {
  font: inherit;
  padding: 14px 12px;
  border: 1px solid var(--bord);
  border-radius: 6px;
  background: #fff;
  min-height: 52px;
}

input:focus-visible, button:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }

button {
  font: inherit;
  font-weight: 600;
  margin-top: 24px;
  padding: 14px 20px;
  min-height: 52px;
  border: 0;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
}

.bandeau button, button.lien {
  margin: 0;
  padding: 10px 14px;
  min-height: 0;
  background: transparent;
  color: var(--accent);
  text-decoration: underline;
}

.alerte {
  padding: 12px 14px;
  border-left: 4px solid var(--alerte);
  background: #fbeae8;
  color: var(--alerte);
}

.message {
  padding: 12px 14px;
  border-left: 4px solid var(--accent);
  background: #eaf1ee;
}

a { color: var(--accent); }

@media (max-width: 420px) {
  body { font-size: 17px; }
  main { padding: 22px 16px 56px; }
}