:root {
  --bg: #0f1419;
  --card: #172029;
  --card-2: #1e2937;
  --line: #2a3745;
  --fg: #e6edf3;
  --fg-dim: #93a4b5;
  --accent: #3b9dff;
  --accent-fg: #06121f;
  --ok: #3fb950;
  --ok-bg: #14301c;
  --bad: #f85149;
  --bad-bg: #341a1a;
  --warn: #d9a441;
  --radius: 12px;
}

:root[data-theme="light"] {
  --bg: #f4f6f8;
  --card: #ffffff;
  --card-2: #eef2f6;
  --line: #d6dee6;
  --fg: #16212b;
  --fg-dim: #5b6b7b;
  --accent: #1668c9;
  --accent-fg: #ffffff;
  --ok: #1a7f37;
  --ok-bg: #e5f5e9;
  --bad: #c62828;
  --bad-bg: #fdeaea;
  --warn: #a06a00;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

main {
  max-width: 820px;
  margin: 0 auto;
  padding: 20px 16px 80px;
}

h1 { font-size: 1.05rem; margin: 0; }
h2 { font-size: 1.05rem; margin: 0 0 12px; }

code, kbd {
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: .85em;
  background: var(--card-2);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 1px 5px;
}

/* ---------- top bar ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 18px;
  background: var(--card);
  border-bottom: 1px solid var(--line);
}
.topbar-right { display: flex; align-items: center; gap: 10px; }
.run-status { color: var(--fg-dim); font-size: .85rem; }

/* ---------- cards ---------- */
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  margin-bottom: 16px;
}

.hint { color: var(--fg-dim); font-size: .85rem; margin: 0 0 12px; }
.error { color: var(--bad); font-size: .9rem; min-height: 1em; margin: 10px 0 0; }

/* ---------- buttons ---------- */
button {
  font: inherit;
  cursor: pointer;
  border-radius: 9px;
  border: 1px solid var(--line);
  padding: 9px 16px;
  background: var(--card-2);
  color: var(--fg);
  transition: filter .12s, border-color .12s;
}
button:hover { filter: brightness(1.15); }
button:disabled { opacity: .45; cursor: default; }
.primary { background: var(--accent); color: var(--accent-fg); border-color: transparent; font-weight: 600; }
.ghost { background: transparent; }
.small { padding: 5px 11px; font-size: .85rem; }
.big { width: 100%; padding: 13px; font-size: 1.05rem; margin-top: 6px; }

/* ---------- setup ---------- */
.bank-list { display: grid; gap: 8px; }
.bank {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  background: var(--card-2);
  border: 1px solid var(--line);
  border-radius: 9px;
  cursor: pointer;
}
.bank input { width: 17px; height: 17px; accent-color: var(--accent); }
.bank .bank-name { flex: 1; }
.bank .bank-count { color: var(--fg-dim); font-size: .85rem; }
.badge {
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .04em;
  padding: 2px 7px;
  border-radius: 999px;
  background: var(--accent);
  color: var(--accent-fg);
}
.badge.ppl { background: var(--warn); color: #1a1205; }
.bank-actions { display: flex; gap: 8px; margin-top: 12px; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; color: var(--fg-dim); font-size: .9rem; }
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--card-2);
  cursor: pointer;
  font-size: .85rem;
  color: var(--fg);
}
.chip.on { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.chip small { color: var(--fg-dim); }

.field { margin-bottom: 16px; }
.field > label { display: block; font-size: .85rem; color: var(--fg-dim); margin-bottom: 6px; }
.field input[type="number"] {
  font: inherit;
  width: 130px;
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--card-2);
  color: var(--fg);
}

.radio-row { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.radio {
  display: flex;
  gap: 9px;
  align-items: center;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--card-2);
  cursor: pointer;
}
.radio input { accent-color: var(--accent); }
.radio span { display: flex; flex-direction: column; }
.radio small { color: var(--fg-dim); font-size: .78rem; }
.radio:has(input:checked) { border-color: var(--accent); }

.checks { display: grid; gap: 9px; }
.check { display: flex; align-items: center; gap: 8px; cursor: pointer; font-size: .92rem; }
.check input { width: 16px; height: 16px; accent-color: var(--accent); }

/* ---------- quiz ---------- */
.quiz-head { margin-bottom: 14px; }
.progress { height: 6px; background: var(--card-2); border-radius: 999px; overflow: hidden; }
#progress-bar { height: 100%; width: 0; background: var(--accent); transition: width .2s; }
.quiz-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 10px;
  font-size: .85rem;
  color: var(--fg-dim);
}
.quiz-meta .tag {
  padding: 2px 9px;
  border: 1px solid var(--line);
  border-radius: 999px;
}
.clock { margin-left: auto; font-variant-numeric: tabular-nums; }
.clock.low { color: var(--bad); font-weight: 700; }

.question-card h2 { font-size: 1.18rem; line-height: 1.45; margin-bottom: 16px; }
.multi-note { color: var(--warn); font-size: .85rem; margin: 0 0 8px; }
.source-note {
  margin: -6px 0 14px;
  padding-left: 10px;
  border-left: 2px solid var(--line);
  color: var(--fg-dim);
  font-size: .78rem;
  line-height: 1.45;
}
.source-note b {
  color: var(--fg);
  font-weight: 600;
  margin-right: 4px;
}

.options { display: grid; gap: 9px; }
.opt {
  display: flex;
  gap: 11px;
  align-items: flex-start;
  text-align: left;
  width: 100%;
  padding: 12px 14px;
  background: var(--card-2);
  border: 1px solid var(--line);
  border-radius: 10px;
  line-height: 1.45;
}
.opt .key {
  flex: 0 0 auto;
  min-width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  border-radius: 6px;
  border: 1px solid var(--line);
  font-size: .75rem;
  color: var(--fg-dim);
}
.opt.sel { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.opt.sel .key { background: var(--accent); color: var(--accent-fg); border-color: transparent; }
.opt.correct { border-color: var(--ok); background: var(--ok-bg); }
.opt.wrong { border-color: var(--bad); background: var(--bad-bg); }
.opt.locked { cursor: default; }

.feedback {
  margin-top: 14px;
  padding: 13px 15px;
  border-radius: 10px;
  border-left: 3px solid var(--accent);
  background: var(--card-2);
  font-size: .93rem;
}
.feedback.ok { border-left-color: var(--ok); }
.feedback.bad { border-left-color: var(--bad); }
.feedback b { display: block; margin-bottom: 4px; }

.quiz-nav { display: flex; gap: 8px; margin-top: 18px; }
.quiz-nav .primary { margin-left: auto; }
#flag.on { border-color: var(--warn); color: var(--warn); }
.keys { margin: 14px 0 0; font-size: .78rem; }

/* ---------- results ---------- */
.verdict { font-size: 1.5rem; font-weight: 700; margin-bottom: 14px; }
.verdict.pass { color: var(--ok); }
.verdict.fail { color: var(--bad); }

.score-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; text-align: center; }
.score-grid div { background: var(--card-2); border: 1px solid var(--line); border-radius: 10px; padding: 12px 6px; }
.score-grid b { display: block; font-size: 1.5rem; }
.score-grid small { color: var(--fg-dim); font-size: .78rem; }

.breakdown { margin-top: 16px; display: grid; gap: 8px; }
.bd-row { display: grid; grid-template-columns: 1fr 70px 46px; gap: 10px; align-items: center; font-size: .88rem; }
.bd-bar { height: 7px; background: var(--card-2); border-radius: 999px; overflow: hidden; }
.bd-bar i { display: block; height: 100%; background: var(--ok); }
.bd-bar i.low { background: var(--bad); }
.bd-val { text-align: right; color: var(--fg-dim); font-variant-numeric: tabular-nums; }

.result-actions { display: flex; gap: 8px; margin-top: 18px; }
.review-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 14px; }
.review-list { display: grid; gap: 14px; }

.rev {
  border: 1px solid var(--line);
  border-left: 3px solid var(--bad);
  border-radius: 10px;
  padding: 14px 16px;
  background: var(--card-2);
}
.rev.ok { border-left-color: var(--ok); }
.rev-top { display: flex; gap: 8px; align-items: center; font-size: .78rem; color: var(--fg-dim); margin-bottom: 8px; }
.rev-q { font-weight: 600; margin-bottom: 10px; line-height: 1.45; }
.rev .source-note { margin: -2px 0 10px; }
.rev-line { font-size: .9rem; margin: 3px 0; }
.rev-line .lbl { color: var(--fg-dim); display: inline-block; min-width: 92px; }
.rev-line.yours { color: var(--bad); }
.rev.ok .rev-line.yours { color: var(--ok); }
.rev-line.right { color: var(--ok); }
.rev-exp {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
  font-size: .9rem;
  color: var(--fg);
}
.rev-exp b { color: var(--fg-dim); font-weight: 600; }

.stats-line { display: flex; justify-content: space-between; font-size: .9rem; padding: 6px 0; border-bottom: 1px solid var(--line); }
.stats-line:last-of-type { border-bottom: 0; }

/* ---------- hero / spaced repetition ---------- */
.hero { background: linear-gradient(140deg, var(--card) 40%, var(--card-2)); }
.hero-main { display: flex; align-items: center; gap: 16px; }
.hero-figure {
  flex: 0 0 auto;
  width: 82px;
  text-align: center;
  padding: 10px 6px;
  border-radius: 12px;
  background: var(--card-2);
  border: 1px solid var(--line);
}
.hero-figure b { display: block; font-size: 1.9rem; line-height: 1.1; color: var(--accent); }
.hero-figure small { color: var(--fg-dim); font-size: .7rem; }
.hero-text h2 { margin-bottom: 4px; }
.hero-text .hint { margin: 0; }
.hero-actions { display: flex; gap: 8px; margin: 16px 0 4px; }
.hero-actions button { flex: 1; padding: 11px; }

.field.inline { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin: 12px 0 0; }
.field.inline > label { margin: 0; }
.field.inline input[type="number"] { width: 92px; }

/* ---------- pills ---------- */
.pill {
  font-size: .72rem;
  font-weight: 700;
  letter-spacing: .03em;
  padding: 3px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--card-2);
  color: var(--fg-dim);
  white-space: nowrap;
}
.pill.ok { color: var(--ok); border-color: var(--ok); background: var(--ok-bg); }
.pill.bad { color: var(--bad); border-color: var(--bad); background: var(--bad-bg); }
.pill.warn { color: var(--warn); border-color: var(--warn); }
.pill.offline { color: var(--warn); border-color: var(--warn); }
.badge.gen { background: #7c5cff; color: #fff; }

/* ---------- trend sparkline ---------- */
.trend { margin: 16px 0 4px; }
.spark { width: 100%; height: 46px; display: block; }
.spark-line { fill: none; stroke: var(--accent); stroke-width: 2; vector-effect: non-scaling-stroke; }
.spark-pass { stroke: var(--fg-dim); stroke-width: 1; stroke-dasharray: 4 4; vector-effect: non-scaling-stroke; }
.spark-dot { fill: var(--accent); }
.trend .hint { margin: 4px 0 0; }

/* ---------- misc ---------- */
.feedback .sched { float: right; font-weight: 400; font-size: .78rem; color: var(--fg-dim); }
.next-review { margin: 12px 0 0; text-align: center; }
.question-card h2 code { font-size: .82em; word-break: break-word; }
.bd-row small.hint { margin: 0; }

@media (max-width: 560px) {
  .radio-row, .score-grid { grid-template-columns: 1fr; }
  .quiz-nav { flex-wrap: wrap; }
  .keys { display: none; }
  .hero-figure { width: 68px; }
  .hero-figure b { font-size: 1.5rem; }
  main { padding-bottom: 40px; }
  .card { padding: 15px; }
  .opt { padding: 14px 13px; }
  .bd-row { grid-template-columns: 1fr 52px 44px; }
}

/* installed as a PWA: respect the notch */
@media (display-mode: standalone) {
  .topbar { padding-top: max(12px, env(safe-area-inset-top)); }
}