:root {
  --bg: #0d1117;
  --panel: #161b22;
  --panel-2: #1c2230;
  --line: #262d3a;
  --text: #e6edf3;
  --muted: #8b96a5;
  --accent: #ff9900;
  --accent-dim: #ff990022;
  --green: #3fb950;
  --red: #f85149;
  --yellow: #d29922;
  --blue: #58a6ff;
  --radius: 12px;
}

* {
  box-sizing: border-box;
}

/* Author `display` rules outrank the UA rule for [hidden], so restate it. */
[hidden] {
  display: none !important;
}

body {
  margin: 0;
  background: radial-gradient(1200px 600px at 50% -200px, #17202e 0%, var(--bg) 60%);
  color: var(--text);
  font: 16px/1.6 ui-sans-serif, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  min-height: 100vh;
}

main {
  max-width: 860px;
  margin: 0 auto;
  padding: 24px 20px 72px;
}

/* Header */

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 24px;
  background: #0d1117e6;
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand-mark {
  width: 10px;
  height: 30px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--accent), #ff5f00);
  flex: none;
}

.topbar h1 {
  margin: 0;
  font-size: 1rem;
  letter-spacing: 0.01em;
}

.topbar p {
  margin: 0;
  font-size: 0.8rem;
}

.chip {
  flex: none;
  padding: 6px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  font-variant-numeric: tabular-nums;
  font-size: 0.85rem;
  white-space: nowrap;
}

.chip.good { color: var(--green); border-color: #3fb95055; }
.chip.ok { color: var(--yellow); border-color: #d2992255; }
.chip.bad { color: var(--red); border-color: #f8514955; }

/* Building blocks */

.muted { color: var(--muted); }

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 20px;
}

.card h2 {
  margin: 0 0 6px;
  font-size: 1.15rem;
}

.card h3 {
  margin: 26px 0 12px;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.card.resume {
  border-color: #ff990055;
  background: linear-gradient(180deg, var(--accent-dim), var(--panel) 70%);
}

.banner {
  max-width: 860px;
  margin: 16px auto -4px;
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: 8px;
  background: var(--panel);
  font-size: 0.9rem;
}

.banner.error {
  border-left-color: var(--red);
  color: #ffb3ae;
}

.row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-top: 20px;
}

button {
  font: inherit;
  font-size: 0.92rem;
  padding: 10px 18px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--panel-2);
  color: var(--text);
  cursor: pointer;
  transition: background 0.12s, border-color 0.12s, transform 0.06s;
}

button:hover:not(:disabled) { border-color: #3b4657; background: #222a38; }
button:active:not(:disabled) { transform: translateY(1px); }

button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #1a1200;
  font-weight: 600;
}

button.primary:hover:not(:disabled) {
  background: #ffab2e;
  border-color: #ffab2e;
}

button.ghost { background: transparent; }
button.ghost.danger { color: #ff9d97; border-color: #f8514944; }
button.ghost.danger:hover { background: #f8514916; border-color: #f8514988; }

kbd {
  font: 600 0.72em ui-monospace, SFMono-Regular, Menlo, monospace;
  padding: 2px 5px;
  margin-left: 4px;
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 4px;
  background: #0d1117;
  color: var(--muted);
}

/* Start form */

.fields {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 18px;
  margin-top: 20px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  border: 0;
  padding: 0;
  margin: 0;
  min-width: 0;
}

.field > span {
  font-size: 0.85rem;
  font-weight: 600;
}

.field small { font-size: 0.76rem; line-height: 1.4; }

input[type="number"],
select {
  font: inherit;
  font-size: 0.92rem;
  padding: 9px 11px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #0d1117;
  color: var(--text);
  width: 100%;
}

input[type="number"]:focus,
select:focus {
  outline: 2px solid var(--accent);
  outline-offset: -1px;
}

.toggles { gap: 8px; }

.check {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--muted);
  cursor: pointer;
}

.check input { accent-color: var(--accent); width: 15px; height: 15px; }

/* Question */

.progress-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
  font-size: 0.82rem;
}

.q-counter {
  font-weight: 600;
  color: var(--blue);
  white-space: nowrap;
}

.track {
  flex: 1;
  height: 6px;
  border-radius: 999px;
  background: var(--panel-2);
  overflow: hidden;
}

.fill {
  height: 100%;
  width: 0;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), #ffc266);
  transition: width 0.25s ease;
}

.q-text {
  margin: 0;
  font-size: 1.06rem;
  line-height: 1.65;
}

.multi-hint {
  margin: 10px 0 0;
  color: #d2a8ff;
  font-size: 0.9rem;
}

.options {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 20px;
}

.option {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  width: 100%;
  text-align: left;
  padding: 13px 15px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #0d1117;
  line-height: 1.55;
}

.option:hover:not(:disabled) { border-color: #47536a; background: #131a24; }

.option .key {
  flex: none;
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  border-radius: 6px;
  border: 1px solid var(--line);
  background: var(--panel-2);
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--muted);
}

.option.selected {
  border-color: var(--accent);
  background: var(--accent-dim);
}

.option.selected .key {
  background: var(--accent);
  border-color: var(--accent);
  color: #1a1200;
}

.option.correct {
  border-color: var(--green);
  background: #3fb9501c;
}

.option.correct .key { background: var(--green); border-color: var(--green); color: #04260a; }

.option.wrong {
  border-color: var(--red);
  background: #f851491c;
}

.option.wrong .key { background: var(--red); border-color: var(--red); color: #2b0503; }

.option:disabled { cursor: default; opacity: 1; }

/* Feedback */

.feedback {
  margin-top: 22px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.verdict {
  margin: 0 0 12px;
  font-size: 1.05rem;
  font-weight: 700;
}

.verdict.correct { color: var(--green); }
.verdict.incorrect { color: var(--red); }
.verdict.skipped { color: var(--yellow); }

.fb-line {
  margin: 0 0 10px;
  font-size: 0.94rem;
}

.fb-line strong { color: var(--muted); font-weight: 600; }

#fb-answer { color: var(--green); }

a { color: var(--blue); }

.hint { font-size: 0.8rem; text-align: center; }

/* Summary */

.verdict-row {
  display: flex;
  align-items: center;
  gap: 18px;
}

.badge {
  padding: 10px 18px;
  border-radius: 10px;
  font-weight: 800;
  letter-spacing: 0.06em;
  font-size: 0.9rem;
}

.badge.pass { background: #3fb9501f; color: var(--green); border: 1px solid #3fb95055; }
.badge.fail { background: #f851491f; color: var(--red); border: 1px solid #f8514955; }
.badge.incomplete { background: #d299221f; color: var(--yellow); border: 1px solid #d2992255; }

.big {
  margin: 0;
  font-size: 1.9rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  line-height: 1.2;
}

.verdict-row p.muted { margin: 2px 0 0; font-size: 0.85rem; }

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 14px;
  margin: 24px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--line);
}

.stats div { min-width: 0; }
.stats dt { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); }
.stats dd { margin: 4px 0 0; font-size: 1.05rem; font-variant-numeric: tabular-nums; }

.domains { display: flex; flex-direction: column; gap: 10px; }

.domain-row {
  display: grid;
  grid-template-columns: minmax(120px, 1.4fr) 2fr auto;
  gap: 12px;
  align-items: center;
  font-size: 0.85rem;
}

.domain-row .track { height: 8px; }
.domain-row .fill { background: linear-gradient(90deg, var(--green), #7ee787); }
.domain-row .fill.low { background: linear-gradient(90deg, var(--red), #ff9d97); }
.domain-row .fill.mid { background: linear-gradient(90deg, var(--yellow), #e3b341); }
.domain-row .tally { color: var(--muted); font-variant-numeric: tabular-nums; white-space: nowrap; }

.review { display: flex; flex-direction: column; gap: 8px; }

details.review-item {
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #0d1117;
  padding: 12px 14px;
}

details.review-item summary {
  cursor: pointer;
  font-size: 0.92rem;
  line-height: 1.5;
}

details.review-item summary::marker { color: var(--muted); }

details.review-item .meta {
  display: block;
  margin-top: 6px;
  font-size: 0.78rem;
  color: var(--muted);
}

details.review-item .body {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
  font-size: 0.9rem;
}

.saved-to {
  margin: 24px 0 0;
  font-size: 0.82rem;
  word-break: break-all;
}

@media (max-width: 600px) {
  main { padding: 16px 14px 56px; }
  .card { padding: 18px; }
  .topbar { padding: 12px 14px; }
  .domain-row { grid-template-columns: 1fr auto; }
  .domain-row .track { display: none; }
}