/* Mobile-first : les règles de base ciblent le téléphone, les media queries élargissent. */
:root {
  --bg: #f6f6f7; --surface: #fff; --text: #17171a; --muted: #6a6a73; --line: #e3e3e8;
  --accent: #d6202a; --accent-text: #fff; --ok: #1a7f46;
  --nav-h: 3.5rem; --gutter: 1rem;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0f0f10; --surface: #1a1a1d; --text: #f1f1f3; --muted: #9a9aa5; --line: #2a2a30; --ok: #4cc481; }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.4 system-ui, -apple-system, "Segoe UI", sans-serif;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) 0 env(safe-area-inset-left);
}
button, input { font: inherit; color: inherit; }
button { -webkit-tap-highlight-color: transparent; }

#app { max-width: 40rem; margin: 0 auto; padding-bottom: calc(var(--nav-h) + env(safe-area-inset-bottom) + 1rem); }
header.bar {
  position: sticky; top: 0; z-index: 2; background: var(--bg);
  display: flex; align-items: center; justify-content: space-between; gap: .5rem;
  padding: .75rem var(--gutter); border-bottom: 1px solid var(--line);
}
header.bar h1 { margin: 0; font-size: 1.25rem; }
.icon-btn, .btn {
  min-height: 44px; min-width: 44px; padding: 0 .9rem; border-radius: .6rem;
  border: 1px solid var(--line); background: var(--surface); cursor: pointer;
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); font-weight: 600; }
.btn.danger { color: var(--accent); }
.btn:disabled { opacity: .6; }
.spin { animation: spin 1s linear infinite; display: inline-block; }
@keyframes spin { to { transform: rotate(360deg); } }

.chips { display: flex; gap: .5rem; overflow-x: auto; padding: .75rem var(--gutter); scrollbar-width: none; }
.chips::-webkit-scrollbar { display: none; }
.chip {
  flex: none; min-height: 44px; padding: 0 .9rem; border-radius: 99px;
  border: 1px solid var(--line); background: var(--surface); cursor: pointer; white-space: nowrap;
}
.chip[aria-pressed="true"] { background: var(--text); color: var(--bg); border-color: var(--text); }

.list { list-style: none; margin: 0; padding: 0 var(--gutter); display: grid; gap: 1rem; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: .8rem; overflow: hidden; }
.card .thumb { display: block; aspect-ratio: 16 / 9; width: 100%; background: var(--line); object-fit: cover; }
.card .body { padding: .75rem; display: grid; gap: .5rem; }
.card h2 { margin: 0; font-size: 1rem; line-height: 1.3; }
.card .meta { color: var(--muted); font-size: .875rem; }
.card .actions { display: flex; gap: .5rem; }
.card .actions .btn { flex: 1; }
.card.done h2 { color: var(--muted); }

.row { display: flex; align-items: center; gap: .75rem; padding: .75rem; background: var(--surface);
  border: 1px solid var(--line); border-radius: .8rem; }
.row .avatar { width: 44px; height: 44px; border-radius: 50%; background: var(--line); object-fit: cover; flex: none; }
.row .grow { flex: 1; min-width: 0; }
.row .grow strong { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.row .meta { color: var(--muted); font-size: .875rem; }

form.add { display: flex; gap: .5rem; padding: .75rem var(--gutter); }
form.add input { flex: 1; min-width: 0; min-height: 44px; padding: 0 .75rem; border-radius: .6rem;
  border: 1px solid var(--line); background: var(--surface); }
.msg { margin: .5rem var(--gutter); color: var(--muted); }
.msg.error { color: var(--accent); }
.toolbar { padding: .75rem var(--gutter); display: grid; }
.empty { text-align: center; color: var(--muted); padding: 3rem var(--gutter); }

nav.tabs {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 3; display: flex;
  background: var(--surface); border-top: 1px solid var(--line);
  padding-bottom: env(safe-area-inset-bottom);
}
nav.tabs button {
  flex: 1; height: var(--nav-h); border: 0; background: none; cursor: pointer; color: var(--muted);
  display: grid; place-items: center; align-content: center; gap: .1rem; font-size: .75rem;
}
nav.tabs button[aria-current="page"] { color: var(--accent); font-weight: 600; }
nav.tabs .ico { font-size: 1.25rem; line-height: 1; }

.login { min-height: 100dvh; display: grid; align-content: center; gap: 1rem; padding: var(--gutter); }
.login h1 { margin: 0; text-align: center; }
.login form { display: grid; gap: .75rem; }
.login input { min-height: 48px; padding: 0 .75rem; border-radius: .6rem; border: 1px solid var(--line); background: var(--surface); }

/* Écrans plus larges : grille à deux colonnes pour les vidéos */
@media (min-width: 40rem) {
  #app { max-width: 56rem; }
  #videos { grid-template-columns: 1fr 1fr; }
}