:root {
  --ink: #1b2a30;
  --soft: #55666d;
  --line: #d5dddf;
  --paper: #f7f8f6;
  --card: #ffffff;
  --accent: #1f4e5f;
  --accent-ink: #ffffff;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 17px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif; }
a { color: var(--accent); }
.top { background: var(--accent); padding: 12px 16px; }
.brand { color: var(--accent-ink); font-weight: 700; font-size: 1.25rem; text-decoration: none; letter-spacing: .01em; }
.brand span { font-weight: 400; opacity: .8; }
main { max-width: 920px; margin: 0 auto; padding: 20px 16px 32px; }
h1 { font-size: 1.5rem; line-height: 1.2; margin: 4px 0 8px; }
h2 { font-size: 1.2rem; margin: 28px 0 8px; }
.meta { color: var(--soft); font-size: .92rem; margin: 4px 0 12px; }
.help { color: var(--soft); font-size: .92rem; }
.bottom { border-top: 1px solid var(--line); color: var(--soft); font-size: .85rem; text-align: center; padding: 8px 16px; }

/* Boutons et grilles */
.btn { display: inline-block; min-height: 44px; padding: 10px 16px; border: 0; border-radius: 8px; background: var(--accent); color: var(--accent-ink); font: inherit; font-weight: 600; text-decoration: none; cursor: pointer; }
.btn:focus-visible, summary:focus-visible, select:focus-visible, a:focus-visible { outline: 3px solid #e0a030; outline-offset: 2px; }
.actions { display: flex; flex-wrap: wrap; gap: 8px; margin: 16px 0; }
figure { margin: 12px 0; }
figure svg { display: block; width: 100%; height: auto; background: #fff; }
figure svg text { font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif; }
.board { max-width: 560px; }
.diagram { max-width: 460px; }

/* Étapes : chacune se découvre d'un toucher */
.steps { display: grid; gap: 8px; }
.step { background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 0 14px; }
.step summary { min-height: 44px; padding: 10px 0; font-weight: 600; cursor: pointer; }
.step p { margin: 0 0 12px; overflow-wrap: anywhere; }
.num { display: inline-block; min-width: 1.8em; color: var(--soft); font-weight: 400; }

/* Catalogue */
.filters { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 10px; margin: 16px 0 8px; }
.filters[hidden] { display: none; }
.filters label { display: grid; gap: 4px; font-size: .9rem; font-weight: 600; }
select { width: 100%; min-height: 44px; padding: 8px; border: 1px solid var(--line); border-radius: 8px; background: var(--card); color: var(--ink); font: inherit; font-weight: 400; }
table { width: 100%; border-collapse: collapse; background: var(--card); font-size: .95rem; }
th, td { padding: 10px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { color: var(--soft); font-size: .85rem; }
tr[hidden] { display: none; }
.books { padding-left: 20px; }
.books li { margin: 8px 0; }

/* Téléphone : chaque grille du catalogue devient une carte, sans défilement horizontal */
@media (max-width: 640px) {
  thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); }
  table, tbody { display: block; background: none; }
  tbody tr { display: grid; grid-template-columns: 1fr auto; gap: 2px 12px; background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; margin-bottom: 8px; }
  tr[hidden] { display: none; }
  td { padding: 0; border: 0; }
  td:nth-child(1) { font-weight: 600; }
  td:nth-child(5), td:nth-child(6) { grid-column: 1 / -1; color: var(--soft); font-size: .88rem; }
}

@media (prefers-color-scheme: dark) {
  :root { --ink: #e8eeef; --soft: #a6b5ba; --line: #36464c; --paper: #162024; --card: #1f2c31; --accent: #2f7186; }
  a { color: #8ccde0; }
  .brand, .btn { color: #fff; }
}
@media print {
  .top, .bottom, .actions, .filters { display: none; }
  body { background: #fff; color: #000; }
}