:root {
  --bg: #0f1419;
  --card: #1a2027;
  --line: #2a323c;
  --text: #e6edf3;
  --muted: #8b97a6;
  --primary: #2f81f7;
  --ok: #3fb950;
  --err: #f85149;
  --warn: #d29922;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }   /* atribut hidden vždy skryje (i u .modal s display:flex) */
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
.muted { color: var(--muted); font-size: 14px; }
.error { color: var(--err); margin: 6px 0 0; }
button { cursor: pointer; font-size: 15px; }
.link { background: none; border: none; color: var(--primary); }

.topbar {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 16px; border-bottom: 1px solid var(--line); background: var(--card);
}
.spacer { flex: 1; }

.wrap { max-width: 640px; margin: 0 auto; padding: 16px; display: grid; gap: 16px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 16px; }

/* sken */
.scan-card label { display: block; margin-bottom: 8px; }
#ean {
  width: 100%; font-size: 28px; padding: 16px; text-align: center;
  border: 2px solid var(--line); border-radius: 10px; background: #0c1116; color: var(--text);
  letter-spacing: 2px;
}
#ean:focus { outline: none; border-color: var(--primary); }
.status { margin-top: 12px; min-height: 24px; font-size: 18px; }
.status.ok { color: var(--ok); }
.status.err { color: var(--err); }
.status.warn { color: var(--warn); }

/* produkt */
.product-main { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }
.p-name { font-size: 20px; font-weight: 600; }
.p-price { font-size: 20px; font-weight: 700; white-space: nowrap; }
.qty-row { display: flex; align-items: center; gap: 8px; margin-top: 16px; }
.qty-row label { margin-right: 4px; }
.qty-btn { width: 44px; height: 44px; font-size: 22px; border: 1px solid var(--line); border-radius: 8px; background: #0c1116; color: var(--text); }
#qty { width: 80px; height: 44px; text-align: center; font-size: 20px; background: #0c1116; color: var(--text); border: 1px solid var(--line); border-radius: 8px; }
.primary { margin-left: auto; height: 44px; padding: 0 24px; border: none; border-radius: 8px; background: var(--primary); color: #fff; font-weight: 600; }

.candidate-list, .history { list-style: none; margin: 8px 0 0; padding: 0; }
.candidate-list li { padding: 12px; border: 1px solid var(--line); border-radius: 8px; margin-bottom: 8px; cursor: pointer; }
.candidate-list li:hover { border-color: var(--primary); }
.history li { padding: 6px 0; border-bottom: 1px solid var(--line); font-size: 14px; }
.history li.err { color: var(--err); }
.hist-head { display: flex; justify-content: space-between; align-items: center; }

/* modal */
.modal { position: fixed; inset: 0; background: rgba(0,0,0,.6); display: flex; align-items: center; justify-content: center; padding: 16px; }
.modal-card { width: 100%; max-width: 520px; max-height: 90vh; overflow: auto; }
.modal-card h2 { margin-top: 0; }
.modal-card label { display: block; margin: 12px 0 4px; font-size: 14px; color: var(--muted); }
.modal-card input, .modal-card textarea {
  width: 100%; padding: 10px; background: #0c1116; color: var(--text);
  border: 1px solid var(--line); border-radius: 8px; font-size: 16px;
}
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.modal-actions { display: flex; justify-content: flex-end; gap: 12px; margin-top: 16px; }

/* výběr kategorie */
.cat-picker { border: 1px solid var(--line); border-radius: 8px; padding: 8px; }
.cat-selected { padding: 6px 8px; background: #0c1116; border-radius: 6px; margin-bottom: 8px; }
.cat-tree, .cat-results { max-height: 220px; overflow: auto; margin-top: 6px; }
.cat-node { display: flex; align-items: center; gap: 6px; padding: 3px 0; }
.cat-toggle { width: 18px; text-align: center; color: var(--muted); user-select: none; }
.cat-toggle.clickable { cursor: pointer; color: var(--text); }
.cat-name { cursor: pointer; padding: 2px 6px; border-radius: 4px; }
.cat-name:hover { background: var(--primary); color: #fff; }
.cat-children { margin-left: 18px; border-left: 1px solid var(--line); padding-left: 6px; }
.cat-result { padding: 8px; border: 1px solid var(--line); border-radius: 6px; margin-bottom: 6px; cursor: pointer; }
.cat-result:hover { border-color: var(--primary); }

/* login */
.login-body { display: flex; min-height: 100vh; align-items: center; justify-content: center; }
.login-card { width: 100%; max-width: 360px; display: grid; gap: 10px; }
.login-card h1 { margin: 0; }
.login-card input { padding: 12px; background: #0c1116; color: var(--text); border: 1px solid var(--line); border-radius: 8px; font-size: 16px; }
.login-card button { padding: 12px; background: var(--primary); color: #fff; border: none; border-radius: 8px; font-weight: 600; }