:root {
  --bg: #ffffff;
  --panel: #f6f7f9;
  --ink: #1f2328;
  --muted: #5f6670;
  --line: #d4d8de;
  --bar: #2f3b4c;
  --bar-ink: #ffffff;
  --accent: #1f5fa8;
  --good: #1d7a3e;
  --bad: #b3261e;
  --warn-bg: #fff4d6;
  --warn-ink: #6b4e00;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.5 var(--font); }
[hidden] { display: none !important; }

.bar { position: sticky; top: 0; z-index: 5; display: flex; align-items: center; gap: 12px;
       padding: 8px 16px; background: var(--bar); color: var(--bar-ink); font-size: 14px; }
.brand { font-weight: 600; letter-spacing: .02em; }
.bar-mid { flex: 1; text-align: center; opacity: .85; }
.bar-right { display: flex; gap: 16px; align-items: center; }
.timer { font-variant-numeric: tabular-nums; padding: 2px 8px; border-radius: 4px; background: rgba(255,255,255,.12); }
.timer.low { background: #8a1c14; }
.warning { position: sticky; top: 38px; z-index: 4; padding: 8px 16px; background: var(--warn-bg); color: var(--warn-ink);
           text-align: center; font-weight: 600; }

main { max-width: 1180px; margin: 0 auto; padding: 24px 16px 96px; }
.muted { color: var(--muted); }
h1 { font-size: 22px; font-weight: 600; margin: 0 0 16px; }
h2 { font-size: 18px; font-weight: 600; margin: 24px 0 8px; }

/* forms */
.card { max-width: 560px; margin: 32px auto; padding: 24px; border: 1px solid var(--line); border-radius: 8px; }
label.field { display: block; margin-bottom: 8px; font-weight: 600; }
input[type=text], input[type=number] { font: inherit; padding: 8px 10px; border: 1px solid var(--line); border-radius: 6px; }
input.code { width: 100%; font-size: 20px; letter-spacing: .1em; }
button { font: inherit; padding: 8px 18px; border-radius: 6px; border: 1px solid var(--accent); background: var(--accent);
         color: #fff; cursor: pointer; }
button.secondary { background: #fff; color: var(--accent); }
button:disabled { opacity: .45; cursor: not-allowed; }
.error { color: var(--bad); margin-top: 10px; }
.row { display: flex; gap: 12px; align-items: center; margin-top: 16px; flex-wrap: wrap; }

.types { width: 100%; border-collapse: collapse; margin: 8px 0 16px; }
.types td { padding: 10px 6px; border-bottom: 1px solid var(--line); }
.types td.left { color: var(--muted); font-size: 14px; }
.stepper { display: inline-flex; align-items: center; gap: 6px; }
.stepper button { padding: 2px 10px; }
.stepper input { width: 56px; text-align: center; }
fieldset { border: 1px solid var(--line); border-radius: 6px; margin: 0 0 16px; padding: 8px 12px 12px; }
legend { font-weight: 600; padding: 0 4px; }
fieldset label { display: inline-flex; gap: 6px; align-items: center; margin: 6px 18px 0 0; }
.summary { color: var(--muted); }

/* question layout */
.q-wrap { display: block; }
.q-wrap.msr { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 24px; }
.q-pane { min-width: 0; }
.sources { min-width: 0; border-right: 1px solid var(--line); padding-right: 24px; }
.tabs { display: flex; flex-wrap: wrap; gap: 4px; border-bottom: 1px solid var(--line); margin-bottom: 12px; }
.tabs button { background: var(--panel); color: var(--ink); border: 1px solid var(--line); border-bottom: none;
               border-radius: 6px 6px 0 0; padding: 6px 14px; font-size: 14px; }
.tabs button[aria-selected=true] { background: #fff; font-weight: 600; position: relative; top: 1px; }
.prompt p, .tab-body p { margin: 0 0 12px; }
img { max-width: 100%; height: auto; }
.scroll { overflow-x: auto; max-width: 100%; margin: 0 0 12px; }
.prompt table, .tab-body table { border-collapse: collapse; font-size: 14px; }
.prompt td, .prompt th, .tab-body td, .tab-body th { border: 1px solid var(--line); padding: 4px 8px; vertical-align: top; }
.prompt th, .tab-body th { background: var(--panel); text-align: left; }
.sortbar { font-size: 14px; margin: 0 0 6px; color: var(--muted); }
.sortbar select { font: inherit; }
th.sortable { cursor: pointer; }
th.sortable::after { content: " \2195"; color: var(--muted); font-size: 12px; }
th.sorted-asc::after { content: " \2191"; color: var(--ink); }
th.sorted-desc::after { content: " \2193"; color: var(--ink); }

.answer { margin-top: 16px; }
table.choice { border-collapse: collapse; margin: 8px 0; }
table.choice th, table.choice td { border: 1px solid var(--line); padding: 6px 10px; }
table.choice th { background: var(--panel); font-weight: 600; font-size: 14px; text-align: center; }
table.choice td.radio { text-align: center; width: 1%; white-space: nowrap; }
table.choice td.text { text-align: left; }
.drop { margin: 0 0 14px; }
.drop select { font: inherit; padding: 2px 4px; margin: 0 2px; max-width: 100%; }
.mc label { display: flex; gap: 10px; align-items: baseline; margin: 6px 0; }
.nav { position: fixed; left: 0; right: 0; bottom: 0; background: #fff; border-top: 1px solid var(--line);
       padding: 10px 16px; display: flex; justify-content: flex-end; gap: 16px; align-items: center; }
.nav .note { color: var(--warn-ink); font-size: 14px; }

/* results */
.score { font-size: 28px; font-weight: 600; margin: 4px 0 4px; }
.review { border: 1px solid var(--line); border-radius: 8px; margin: 12px 0; }
.review > summary { list-style: none; cursor: pointer; padding: 10px 14px; display: flex; gap: 12px; align-items: baseline;
                    flex-wrap: wrap; }
.review > summary::-webkit-details-marker { display: none; }
.badge { font-size: 13px; font-weight: 600; padding: 1px 8px; border-radius: 10px; }
.badge.ok { background: #e3f3e8; color: var(--good); }
.badge.no { background: #fbe5e3; color: var(--bad); }
.review .body { padding: 0 14px 14px; border-top: 1px solid var(--line); }
.cmp { width: 100%; border-collapse: collapse; font-size: 14px; margin: 10px 0; }
.cmp td, .cmp th { border-bottom: 1px solid var(--line); padding: 4px 6px; text-align: left; vertical-align: top; }
.cmp td.ok { color: var(--good); }
.cmp td.no { color: var(--bad); }
.expl { background: var(--panel); border-radius: 6px; padding: 10px 14px; margin-top: 10px; }
.save { margin: 16px 0; padding: 10px 14px; border-radius: 6px; background: var(--panel); }
.save.failed { background: #fbe5e3; }
textarea.dump { width: 100%; height: 160px; font: 12px/1.4 ui-monospace, Menlo, monospace; margin-top: 8px; }

@media (max-width: 820px) {
  .q-wrap.msr { grid-template-columns: minmax(0, 1fr); }
  .sources { border-right: none; padding-right: 0; border-bottom: 1px solid var(--line); padding-bottom: 12px; }
  .bar-mid { display: none; }
}