:root {
  --bg: #f4f5f7; --card: #fff; --text: #1c1f24; --muted: #6b7280;
  --brand: #1f3a5f; --brand-text: #fff; --border: #e3e6ea;
  --in: #157347; --out: #b45309; --overdue: #b91c1c;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #111418; --card: #1b1f25; --text: #e8eaed; --muted: #9aa3ad;
          --brand: #3b6ea8; --border: #2c323a; --in: #4ade80; --out: #fbbf24; --overdue: #f87171; }
}
* { box-sizing: border-box; }
body { margin: 0; font: 16px/1.45 system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
       background: var(--bg); color: var(--text); padding-bottom: 80px; }
header { background: var(--brand); color: var(--brand-text); padding: 14px 16px;
         display: flex; justify-content: space-between; align-items: center; }
header h1 { margin: 0; font-size: 1.15rem; }
.view { padding: 16px; max-width: 640px; margin: 0 auto; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 16px; margin-top: 16px; }
h2 { margin: 0 0 8px; font-size: 1.2rem; }
label { display: block; margin: 10px 0; font-size: .9rem; color: var(--muted); }
input { display: block; width: 100%; margin-top: 4px; padding: 12px; font-size: 16px;
        border: 1px solid var(--border); border-radius: 8px; background: var(--card); color: var(--text); }
button { padding: 12px 16px; font-size: 16px; border-radius: 8px; border: 1px solid var(--border);
         background: var(--card); color: var(--text); cursor: pointer; }
button.primary { background: var(--brand); color: var(--brand-text); border-color: var(--brand); width: 100%; }
button.link { background: none; border: none; color: inherit; text-decoration: underline; padding: 0; }
.row { display: flex; gap: 8px; margin-top: 12px; align-items: center; }
.row input { margin: 0; flex: 1; }
.row button.primary { width: auto; }
.between { justify-content: space-between; margin-top: 0; }
.reader { width: 100%; margin-bottom: 12px; border-radius: 12px; overflow: hidden; background: #000; }
.reader video { width: 100% !important; display: block; }
.hidden { display: none !important; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.status { font-weight: 600; margin: 8px 0; }
.status.in { color: var(--in); } .status.out { color: var(--out); }
.error { color: var(--overdue); } .msg { margin-top: 12px; font-weight: 500; }
.hint { background: color-mix(in srgb, var(--brand) 12%, transparent); padding: 8px 10px; border-radius: 8px; font-size: .9rem; }
.list { list-style: none; padding: 0; margin: 12px 0; }
.list li { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 12px; margin-bottom: 8px; }
.list li.overdue { border-left: 4px solid var(--overdue); }
.list .title { font-weight: 600; }
.list .meta { color: var(--muted); font-size: .88rem; }
.list a { color: var(--brand); }
.badge { display: inline-block; font-size: .75rem; padding: 2px 8px; border-radius: 99px; margin-left: 6px; color: #fff; }
.badge.overdue { background: var(--overdue); } .badge.out { background: var(--out); } .badge.returned { background: var(--muted); }
.tabs { position: fixed; bottom: 0; left: 0; right: 0; display: flex; background: var(--card);
        border-top: 1px solid var(--border); padding-bottom: env(safe-area-inset-bottom); }
.tabs button { flex: 1; border: none; border-radius: 0; padding: 16px 0; background: none; color: var(--muted); }
.tabs button.active { color: var(--brand); font-weight: 600; }