:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --text: #16191f;
  --muted: #5f6b7a;
  --line: #e3e6ea;
  --accent: #ec7211;
  --accent-text: #ffffff;
  --good: #1d8102;
  --good-bg: #e9f6e4;
  --warn: #8a6100;
  --warn-bg: #fdf3d7;
  --bad: #c7291c;
  --bad-bg: #fdeceb;
  --sel: #fff4ea;
  --radius: 12px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1419;
    --card: #19202a;
    --text: #e8ebef;
    --muted: #97a3b2;
    --line: #2a3340;
    --accent: #ff9a3d;
    --accent-text: #16191f;
    --good: #6fd36a;
    --good-bg: #17301a;
    --warn: #f2c14e;
    --warn-bg: #352a10;
    --bad: #ff7a6e;
    --bad-bg: #3a1a18;
    --sel: #2a2118;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
a { color: var(--accent); }
h1 { font-size: 1.5rem; line-height: 1.25; margin: 0 0 .5rem; }
h2 { font-size: 1.1rem; margin: 0 0 .75rem; }
.wrap { max-width: 820px; margin: 0 auto; padding: 16px 16px 96px; }
.muted { color: var(--muted); }
.small { font-size: .85rem; }
.good { color: var(--good); }
.bad { color: var(--bad); }
.r { text-align: right; }

.topbar {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 10px 16px; background: var(--card); border-bottom: 1px solid var(--line);
  position: sticky; top: 0; z-index: 5;
}
.brand { font-weight: 700; color: var(--text); text-decoration: none; }
.topbar nav { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.topbar nav a { color: var(--muted); text-decoration: none; font-size: .95rem; }
.topbar nav a:hover { color: var(--text); }
.topbar form { margin: 0; }
.linkish { background: none; border: 0; color: var(--muted); font: inherit; font-size: .95rem; cursor: pointer; padding: 0; }

.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px; margin: 0 0 14px;
}
.narrow { max-width: 380px; margin: 12vh auto 0; }
.stack { display: grid; gap: 10px; }
input[type=password] {
  font: inherit; padding: 10px 12px; border-radius: 8px; border: 1px solid var(--line);
  background: var(--bg); color: var(--text);
}

.btn {
  display: inline-block; background: var(--accent); color: var(--accent-text); border: 0;
  border-radius: 8px; padding: 10px 18px; font: inherit; font-weight: 600; cursor: pointer; text-decoration: none;
}
.btn.ghost { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
.btn:focus-visible, .opt:focus-within, .chip:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.hero { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; align-items: center; }
.eyebrow { text-transform: uppercase; letter-spacing: .06em; font-size: .75rem; color: var(--muted); margin: 0 0 4px; }
.hero-stats { display: flex; gap: 22px; }
.stat { display: grid; text-align: center; }
.stat .num { font-size: 1.8rem; font-weight: 700; font-variant-numeric: tabular-nums; }
.stat .lbl { font-size: .75rem; color: var(--muted); }

.grid { width: 100%; border-collapse: collapse; }
.grid th, .grid td { padding: 8px 4px; border-bottom: 1px solid var(--line); vertical-align: middle; }
.grid th { font-size: .8rem; color: var(--muted); font-weight: 600; text-align: left; }
.grid th.r { text-align: right; }
.grid tr:last-child td { border-bottom: 0; }

.pill { display: inline-block; font-size: .78rem; font-weight: 600; padding: 2px 8px; border-radius: 999px; }
.pill.good { background: var(--good-bg); color: var(--good); }
.pill.warn { background: var(--warn-bg); color: var(--warn); }
.pill.bad { background: var(--bad-bg); color: var(--bad); }

/* test */
.test-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 12px; }
.timer {
  font-variant-numeric: tabular-nums; font-weight: 700; font-size: 1.2rem;
  background: var(--card); border: 1px solid var(--line); border-radius: 8px; padding: 4px 10px;
  position: sticky; top: 56px;
}
.q-head { display: flex; justify-content: space-between; align-items: center; gap: 8px; margin-bottom: 6px; }
.qnum { font-size: .8rem; color: var(--muted); font-weight: 600; }
.stem { margin: 0 0 10px; font-weight: 500; }
.choose { margin: -4px 0 10px; font-size: .85rem; font-weight: 700; color: var(--accent); }
.opts { display: grid; gap: 8px; padding: 0; margin: 0 0 10px; list-style: none; }
.opt {
  display: flex; gap: 10px; align-items: flex-start; padding: 10px 12px;
  border: 1px solid var(--line); border-radius: 8px; cursor: pointer;
}
.opt input { margin-top: 4px; accent-color: var(--accent); flex: none; }
.opt:has(input:checked) { border-color: var(--accent); background: var(--sel); }
.letter { font-weight: 700; color: var(--muted); flex: none; width: 1.1em; }
.guess { font-size: .85rem; color: var(--muted); display: inline-flex; gap: 6px; align-items: center; cursor: pointer; }
.q.answered { border-left: 4px solid var(--accent); }
.save-state { margin: 4px 0 0; min-height: 1.2em; }
.submitbar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 5;
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  padding: 10px max(16px, calc((100vw - 820px) / 2 + 16px));
  background: var(--card); border-top: 1px solid var(--line);
}

/* results */
.result.ok { border-left: 4px solid var(--good); }
.result.ko { border-left: 4px solid var(--bad); }
.review .opt { cursor: default; }
.review .opt.is-answer { border-color: var(--good); background: var(--good-bg); }
.review .opt.is-wrong { border-color: var(--bad); background: var(--bad-bg); }
.tag { margin-left: auto; font-size: .75rem; color: var(--muted); white-space: nowrap; }
.explain { background: var(--bg); border-radius: 8px; padding: 10px 12px; font-size: .95rem; }
.filter { display: flex; gap: 8px; margin: 4px 0 12px; }
.chip { font: inherit; font-size: .85rem; border: 1px solid var(--line); background: var(--card); color: var(--text); border-radius: 999px; padding: 4px 12px; cursor: pointer; }
.chip.on { border-color: var(--accent); color: var(--accent); }

/* stats */
.bars { display: grid; gap: 8px; }
.bar-row { display: grid; grid-template-columns: minmax(90px, 30%) 1fr auto; gap: 10px; align-items: center; font-size: .9rem; }
.bar-label { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.bar { height: 10px; background: var(--bg); border-radius: 999px; overflow: hidden; }
.fill { display: block; height: 100%; border-radius: 999px; }
.fill.good { background: var(--good); }
.fill.warn { background: var(--warn); }
.fill.bad { background: var(--bad); }
.bar-val { font-variant-numeric: tabular-nums; white-space: nowrap; }
.trend { position: relative; height: 160px; display: flex; align-items: flex-end; gap: 4px; border-bottom: 1px solid var(--line); }
.trend .col { flex: 1; max-width: 28px; border-radius: 4px 4px 0 0; min-height: 4px; }
.trend .col.good { background: var(--good); }
.trend .col.bad { background: var(--bad); }
.passline { position: absolute; left: 0; right: 0; border-top: 2px dashed var(--muted); }
.missed { padding-left: 1.2em; margin: 0; display: grid; gap: 8px; }

@media (max-width: 560px) {
  .hide-sm { display: none; }
  h1 { font-size: 1.3rem; }
  .card { padding: 14px; }
  .topbar nav { gap: 10px; }
}