:root {
  --bg: #f4f6f9;
  --card: #ffffff;
  --text: #1c2430;
  --muted: #64707f;
  --line: #e1e6ec;
  --primary: #1f4e79;
  --primary-2: #2b6cb0;
  --ok: #15803d;
  --ok-bg: #e7f6ec;
  --bad: #b91c1c;
  --bad-bg: #fdecec;
  --warn: #a16207;
  --warn-bg: #fdf6e3;
  --radius: 10px;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 "Segoe UI", system-ui, -apple-system, Roboto, Arial, sans-serif;
}
a { color: var(--primary-2); text-decoration: none; }
a:hover { text-decoration: underline; }
h1 { font-size: 24px; margin: 0 0 4px; }
h2 { font-size: 17px; margin: 0 0 12px; }
.muted { color: var(--muted); }
.small { font-size: 13px; }

.topbar {
  background: var(--primary);
  color: #fff;
  display: flex; align-items: center; gap: 24px;
  padding: 0 24px; height: 56px;
}
.brand { font-weight: 700; font-size: 18px; color: #fff; letter-spacing: .3px; display: flex; align-items: center; gap: 8px; }
.brand:hover { text-decoration: none; }
.brand-logo { width: 38px; height: 38px; border-radius: 50%; background: #fff; }
.user-chip { color: #d6e4f2; font-size: 14px; max-width: 200px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.user-chip:hover { color: #fff; }
.context-bar { background: #fff4d6; border-bottom: 1px solid #f0d58a; padding: 8px 24px; font-size: 14px; display: flex; gap: 12px; align-items: center; }
.secret { font-family: monospace; font-size: 16px; background: #f1f5f9; padding: 6px 10px; border-radius: 6px; user-select: all; }
@media (max-width: 720px) { .brand-text, .user-chip { display: none; } }
/* Question bank */
.q-card { padding: 14px 18px; margin-bottom: 12px; }
.q-meta { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-bottom: 8px; }
.q-text { font-size: 15px; margin-bottom: 8px; }
.q-img { max-width: 320px; max-height: 220px; border: 1px solid var(--line); border-radius: 6px; margin-bottom: 8px; }
.q-opts { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 4px 16px; }
.q-opt { padding: 3px 8px; border-radius: 6px; }
.q-opt.right { background: var(--ok-bg); color: var(--ok); font-weight: 600; }
.composer-row { display: grid; grid-template-columns: 1.1fr 1.2fr 1.4fr .6fr .8fr .6fr; gap: 8px 10px; align-items: end; margin-bottom: 10px; }
@media (max-width: 860px) { .composer-row { grid-template-columns: 1fr 1fr; } }

/* Key of a booklet composed from the bank: shown, not editable */
.key-locked #key-save, .key-locked #key-apply, .key-locked #key-text { display: none !important; }
.key-locked #key-grid button { pointer-events: none; }

/* Test page for a user who may only view the test */
.read-only #edit-box, .read-only #key-save, .read-only #key-apply, .read-only #key-text, .read-only #booklet-form,
.read-only [data-renum], .read-only [data-bdel], .read-only [data-edit], .read-only [data-del] { display: none !important; }
.read-only #key-grid button { pointer-events: none; }
.brand span { color: #9ec5ee; }
.nav { display: flex; gap: 4px; flex: 1; }
.nav a { color: #d6e4f2; padding: 8px 12px; border-radius: 6px; }
.nav a:hover { background: rgba(255,255,255,.1); text-decoration: none; }
.nav a.active { background: rgba(255,255,255,.18); color: #fff; }
.topbar form button { background: transparent; border: 1px solid rgba(255,255,255,.4); color: #fff; }

main { max-width: 1180px; margin: 0 auto; padding: 24px; }
.page-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 16px; margin-bottom: 20px; flex-wrap: wrap; }

.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px 20px; margin-bottom: 18px; }
.grid { display: grid; gap: 18px; }
.grid-2 { grid-template-columns: 1fr 1fr; }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 860px) { .grid-2, .grid-4 { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .grid-2, .grid-4 { grid-template-columns: 1fr; } main { padding: 16px; } .topbar { gap: 10px; padding: 0 16px; } .nav a { padding: 6px 8px; } }

.stat .value { font-size: 28px; font-weight: 700; }
.stat .label { color: var(--muted); font-size: 13px; }

button, .btn {
  display: inline-flex; align-items: center; gap: 6px;
  font: inherit; font-size: 14px; cursor: pointer;
  padding: 8px 14px; border-radius: 7px;
  border: 1px solid var(--line); background: #fff; color: var(--text);
}
button:hover, .btn:hover { border-color: #b8c2cf; text-decoration: none; }
.btn-primary { background: var(--primary-2); border-color: var(--primary-2); color: #fff; }
.btn-primary:hover { background: var(--primary); border-color: var(--primary); }
.btn-danger { color: var(--bad); }
.btn-sm { padding: 4px 9px; font-size: 13px; }
button:disabled { opacity: .55; cursor: default; }

input, select, textarea {
  font: inherit; font-size: 14px; padding: 8px 10px;
  border: 1px solid var(--line); border-radius: 7px; background: #fff; color: var(--text); width: 100%;
}
input:focus, select:focus, textarea:focus { outline: 2px solid #bcd6f2; border-color: var(--primary-2); }
label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 4px; }
.form-row { display: flex; gap: 12px; flex-wrap: wrap; align-items: flex-end; }
.form-row > div { flex: 1 1 160px; }
.form-row > .shrink { flex: 0 0 auto; }

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--line); vertical-align: middle; }
th { font-size: 12px; text-transform: uppercase; letter-spacing: .4px; color: var(--muted); font-weight: 600; }
tr:last-child td { border-bottom: 0; }
td.num, th.num { text-align: center; }
.table-wrap { overflow-x: auto; }
.actions { white-space: nowrap; text-align: right; }

.badge { display: inline-block; padding: 1px 8px; border-radius: 99px; font-size: 12px; font-weight: 600; }
.badge-ok { background: var(--ok-bg); color: var(--ok); }
.badge-bad { background: var(--bad-bg); color: var(--bad); }
.badge-warn { background: var(--warn-bg); color: var(--warn); }
.badge-muted { background: #eef1f5; color: var(--muted); }

.empty { text-align: center; color: var(--muted); padding: 28px 0; }

#toast { position: fixed; right: 20px; bottom: 20px; display: flex; flex-direction: column; gap: 8px; z-index: 50; }
.toast { background: #1c2430; color: #fff; padding: 10px 16px; border-radius: 8px; box-shadow: 0 6px 20px rgba(0,0,0,.18); max-width: 380px; }
.toast.err { background: var(--bad); }

.dropzone {
  border: 2px dashed #b8c6d6; border-radius: var(--radius); background: #fafcfe;
  padding: 34px 20px; text-align: center; cursor: pointer; transition: .15s;
}
.dropzone.over { border-color: var(--primary-2); background: #eef5fc; }
.dropzone strong { display: block; font-size: 16px; margin-bottom: 4px; }

.key-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 6px 18px; }
.key-block { grid-column: 1 / -1; font-weight: 600; margin-top: 10px; padding-bottom: 4px; border-bottom: 1px solid var(--line); }
.key-block:first-child { margin-top: 0; }
.key-row { display: flex; align-items: center; gap: 6px; }
.key-row .n { width: 26px; text-align: right; font-weight: 600; color: var(--muted); font-size: 13px; }
.key-row button { width: 30px; height: 30px; padding: 0; justify-content: center; border-radius: 50%; font-weight: 600; font-size: 13px; }
.key-row button.on { background: var(--primary-2); border-color: var(--primary-2); color: #fff; }

.bar { height: 8px; background: #edf1f5; border-radius: 99px; overflow: hidden; }
.bar > i { display: block; height: 100%; background: var(--primary-2); }
.q-stats { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 8px 18px; }
.q-stats div { font-size: 13px; }

dialog { border: 0; border-radius: 12px; padding: 0; width: min(920px, 95vw); box-shadow: 0 20px 60px rgba(0,0,0,.3); }
dialog::backdrop { background: rgba(15, 23, 42, .5); }
dialog .dlg-head { display: flex; justify-content: space-between; align-items: center; padding: 14px 18px; border-bottom: 1px solid var(--line); }
dialog .dlg-body { padding: 18px; max-height: 75vh; overflow: auto; }
dialog img { width: 100%; border: 1px solid var(--line); border-radius: 6px; }

.login-wrap { min-height: 100vh; display: grid; place-items: center; padding: 16px; }
.login-card { width: min(380px, 100%); }
.alert { padding: 10px 12px; border-radius: 7px; background: var(--bad-bg); color: var(--bad); margin-bottom: 12px; font-size: 14px; }
.scan-log li { margin-bottom: 6px; }