/* ============================================================
   Parquet Quiz — Modern UI
   ============================================================ */

* { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-feature-settings: var(--font-feature-settings);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  scroll-behavior: smooth;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

/* ---------- Top bar ---------- */
.qtopbar {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in oklab, var(--bg) 88%, transparent);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
          backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid var(--border);
  padding: 12px 24px;
}
.qtopbar-inner {
  max-width: 1280px; margin: 0 auto;
  display: grid;
  grid-template-columns: auto auto 1fr auto auto auto auto;
  gap: 14px; align-items: center;
}
.qtopbar .brand { display: flex; align-items: center; gap: 10px; font-family: var(--font-sans); font-weight: 700; font-size: 15px; letter-spacing: -0.01em; color: var(--text); }
.qtopbar .brand-mark { width: 24px; height: 24px; border-radius: 7px; background: var(--accent); display: grid; place-items: center; color: var(--accent-contrast); font-size: 11px; font-weight: 800; }
.qtopbar .brand-mark::before { content: 'P'; }

.qcrumbs { font-family: var(--font-mono); font-size: 11px; color: var(--text-muted); display: flex; align-items: center; gap: 6px; min-width: 0; }
.qcrumbs a { color: var(--text-muted); transition: color var(--t-fast); }
.qcrumbs a:hover { color: var(--accent); }
.qcrumbs .sep { color: var(--text-faint); }
.qcrumbs .cur { color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

/* Timer */
.timer {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-mono); font-size: 13px; font-weight: 500;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  padding: 7px 6px 7px 14px;
  color: var(--text);
}
.timer .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); animation: pulse 1.6s ease-in-out infinite; }
.timer .dot.paused { background: var(--text-faint); animation: none; }
@keyframes pulse { 0%,100%{ opacity: 1; transform: scale(1); } 50%{ opacity: 0.4; transform: scale(0.85); } }
#timerVal { font-variant-numeric: tabular-nums; min-width: 48px; }
.timer button {
  background: var(--surface-2); border: none; border-radius: var(--r-pill);
  font: inherit; font-size: 11px; font-weight: 600; letter-spacing: 0.04em;
  color: var(--text-muted); padding: 4px 11px;
  transition: all var(--t-fast);
}
.timer button:hover { background: var(--accent-soft); color: var(--accent); }

/* Running score (live tally) */
.running-score {
  display: flex; gap: 6px; align-items: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  padding: 6px;
  font-family: var(--font-mono); font-size: 12px; font-weight: 600;
}
.rs-item {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 3px 10px;
  border-radius: var(--r-pill);
  background: var(--surface-2);
}
.rs-item.c { color: var(--success); background: color-mix(in oklab, var(--success) 14%, var(--bg)); }
.rs-item.w { color: var(--danger);  background: color-mix(in oklab, var(--danger) 14%, var(--bg)); }
.rs-item.s { color: var(--text-muted); }
.rs-item .d { width: 6px; height: 6px; border-radius: 50%; background: currentColor; opacity: 0.85; }

/* ---------- Hero / question header ---------- */
.qhead {
  max-width: 880px; margin: 28px auto 8px; padding: 0 24px;
}
.qhead .eyebrow {
  font-family: var(--font-mono); font-size: 11px; font-weight: 600;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 14px;
  display: inline-flex; align-items: center; gap: 8px;
}
.qhead .eyebrow::before {
  content: ''; width: 24px; height: 1px; background: var(--accent);
}
.qhead h1 {
  font-family: var(--font-sans); font-weight: 700; font-size: clamp(28px, 4.2vw, 44px);
  line-height: 1.1; letter-spacing: -0.025em; color: var(--text);
  margin-bottom: 12px;
}
.qhead h1 em { font-style: normal; color: var(--accent); }
.qhead .deck {
  font-size: 16px; line-height: 1.55; color: var(--text-dim); max-width: 64ch;
}

/* ---------- Sticky progress strip ---------- */
.progress-strip {
  position: sticky; top: 64px; z-index: 90;
  background: color-mix(in oklab, var(--bg) 92%, transparent);
  -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  padding: 10px 24px 12px;
}
.ps-inner { max-width: 880px; margin: 0 auto; }
.track {
  height: 6px; background: var(--surface-2);
  border-radius: var(--r-pill); overflow: hidden;
}
.track > div {
  height: 100%; width: 0%;
  background: linear-gradient(90deg, var(--accent), color-mix(in oklab, var(--accent) 75%, white));
  border-radius: var(--r-pill);
  transition: width var(--t-slow) var(--ease-out);
  position: relative;
}
.track > div::after {
  content: '';
  position: absolute; right: 0; top: -3px; bottom: -3px; width: 12px;
  background: radial-gradient(circle, color-mix(in oklab, var(--accent) 50%, transparent), transparent 70%);
  filter: blur(4px);
}
.ps-meta {
  margin-top: 10px;
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
}
.ps-left { display: flex; align-items: center; gap: 14px; min-width: 0; flex: 1; }
#progressLabel {
  font-family: var(--font-mono); font-size: 11px; font-weight: 600;
  color: var(--text-dim); white-space: nowrap;
}
.qdots {
  display: flex; flex-wrap: wrap; gap: 3px;
  min-width: 0; flex: 1 1 auto;
  align-content: flex-start;
}
.qdot {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--surface-2);
  border: 1px solid var(--border);
  cursor: pointer;
  flex: 0 0 auto;
  transition: all var(--t-fast);
}
.qdot:hover { transform: scale(1.4); border-color: var(--accent); }
.qdot.answered { background: var(--text-muted); border-color: transparent; }
.qdot.correct { background: var(--success); border-color: transparent; }
.qdot.wrong { background: var(--danger); border-color: transparent; }
.qdot.flagged { box-shadow: 0 0 0 2px color-mix(in oklab, var(--warn) 60%, transparent); }
.ps-right { display: inline-flex; gap: 2px; padding: 3px; background: var(--surface-2); border-radius: var(--r-pill); }
.ps-right a {
  font-family: var(--font-mono); font-size: 11px; font-weight: 600;
  letter-spacing: 0.04em;
  padding: 5px 12px; border-radius: var(--r-pill);
  color: var(--text-muted); cursor: pointer;
  transition: all var(--t-fast);
  white-space: nowrap;
}
.ps-right a:hover { color: var(--text); }
.ps-right a.active { background: var(--bg-elevated); color: var(--accent); box-shadow: var(--shadow-xs); }

/* ---------- Topic header (when by-topic mode) ---------- */
.topic-header {
  max-width: 880px; margin: 32px auto 14px; padding: 0 24px;
  display: flex; align-items: baseline; gap: 16px;
  border-bottom: 1px solid var(--border); padding-bottom: 12px;
}
.topic-header h2 {
  font-family: var(--font-sans); font-size: 19px; font-weight: 700;
  letter-spacing: -0.015em; color: var(--text);
}
.topic-meta {
  font-family: var(--font-mono); font-size: 11px;
  color: var(--text-muted); letter-spacing: 0.04em;
}
.topic-score { margin-left: auto; display: none; gap: 14px; font-family: var(--font-mono); font-size: 11px; }
.topic-score.show { display: inline-flex; }
.topic-score .tc { color: var(--success); }
.topic-score .tw { color: var(--danger); }
.topic-score .ts { color: var(--text-faint); }
.topic-score strong { color: var(--text); font-weight: 700; }

/* ---------- Question card ---------- */
.qcard {
  max-width: 880px; margin: 18px auto;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 28px 32px 30px;
  box-shadow: var(--shadow-xs);
  scroll-margin-top: 130px;
  transition: all var(--t-base);
  position: relative;
  animation: cardIn .5s var(--ease-out) backwards;
}
@keyframes cardIn { from { opacity: 0; transform: translateY(8px); } }
.qcard:nth-child(1) { animation-delay: .04s; }
.qcard:nth-child(2) { animation-delay: .08s; }
.qcard:nth-child(3) { animation-delay: .12s; }
.qcard:nth-child(4) { animation-delay: .16s; }
.qcard:hover { box-shadow: var(--shadow-sm); }
.qcard.correct-card  { border-color: color-mix(in oklab, var(--success) 50%, var(--border)); box-shadow: 0 0 0 1px color-mix(in oklab, var(--success) 30%, transparent), var(--shadow-sm); }
.qcard.wrong-card    { border-color: color-mix(in oklab, var(--danger) 50%, var(--border));  box-shadow: 0 0 0 1px color-mix(in oklab, var(--danger) 30%, transparent),  var(--shadow-sm); }
.qcard.skipped-card  { opacity: 0.7; }

.q-header {
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 16px;
}
.q-num {
  font-family: var(--font-mono); font-size: 11px; font-weight: 600; letter-spacing: 0.06em;
  color: var(--text-muted);
  background: var(--surface);
  padding: 4px 10px; border-radius: var(--r-pill);
}
.q-badge {
  font-family: var(--font-mono); font-size: 10px; font-weight: 600; letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 10px; border-radius: var(--r-pill);
}
.q-flag {
  margin-left: auto;
  display: inline-flex; align-items: center; gap: 6px;
  background: transparent; border: 1px solid var(--border);
  border-radius: var(--r-pill); padding: 5px 12px;
  font-size: 12px; font-weight: 500; color: var(--text-muted);
  transition: all var(--t-fast);
}
.q-flag svg { width: 14px; height: 14px; }
.q-flag:hover { color: var(--warn); border-color: var(--warn); background: color-mix(in oklab, var(--warn) 10%, var(--bg-elevated)); }
.q-flag.flagged { color: var(--warn); border-color: var(--warn); background: color-mix(in oklab, var(--warn) 12%, var(--bg-elevated)); }

.q-text {
  font-family: var(--font-sans); font-size: 17px; line-height: 1.55;
  color: var(--text); font-weight: 500;
  letter-spacing: -0.005em;
  margin-bottom: 22px;
  text-wrap: pretty;
}

/* Options */
.options { display: flex; flex-direction: column; gap: 10px; }
.opt-label {
  display: grid; grid-template-columns: auto 1fr auto;
  align-items: center; gap: 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  padding: 14px 16px;
  cursor: pointer;
  transition: background var(--t-fast), border-color var(--t-fast), transform var(--t-fast);
  position: relative;
}
.opt-label:hover {
  background: var(--surface-hover);
  border-color: color-mix(in oklab, var(--accent) 35%, var(--border));
}
.opt-label:active { transform: translateY(1px); }
.opt-label input { position: absolute; opacity: 0; pointer-events: none; }
.opt-label .letter {
  width: 28px; height: 28px;
  display: grid; place-items: center;
  border-radius: var(--r-sm);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  font-family: var(--font-mono); font-size: 12px; font-weight: 700;
  color: var(--text-muted);
  transition: all var(--t-fast);
}
.opt-label .opt-text {
  font-size: 15px; line-height: 1.45; color: var(--text);
  text-wrap: pretty;
}
.opt-label .key-hint {
  font-family: var(--font-mono); font-size: 10px; font-weight: 600;
  color: var(--text-faint);
  background: var(--surface-2);
  padding: 2px 8px; border-radius: var(--r-xs);
  opacity: 0; transition: opacity var(--t-fast);
}
.opt-label:hover .key-hint { opacity: 1; }

.opt-label.selected {
  background: var(--accent-soft);
  border-color: var(--accent);
}
.opt-label.selected .letter { background: var(--accent); color: var(--accent-contrast); border-color: transparent; }

/* Submitted states */
.opt-label.correct-opt {
  background: color-mix(in oklab, var(--success) 14%, var(--bg-elevated));
  border-color: var(--success);
  animation: pulseCorrect .4s var(--ease-out);
}
.opt-label.correct-opt .letter { background: var(--success); color: white; border-color: transparent; }
.opt-label.wrong-opt {
  background: color-mix(in oklab, var(--danger) 14%, var(--bg-elevated));
  border-color: var(--danger);
  animation: shake .35s var(--ease-out);
}
.opt-label.wrong-opt .letter { background: var(--danger); color: white; border-color: transparent; }
.opt-label.missed-opt {
  border-color: var(--success);
  border-style: dashed;
}
.opt-label.missed-opt .letter { color: var(--success); border-color: var(--success); }

@keyframes pulseCorrect { 0% { transform: scale(1); } 50% { transform: scale(1.01); } 100% { transform: scale(1); } }
@keyframes shake { 10%,90%{transform:translateX(-2px);} 20%,80%{transform:translateX(3px);} 30%,50%,70%{transform:translateX(-4px);} 40%,60%{transform:translateX(4px);} }

/* Match question */
.match-section { margin-bottom: 16px; }
.match-label {
  font-family: var(--font-mono); font-size: 11px; font-weight: 600;
  letter-spacing: 0.05em; text-transform: uppercase;
  color: var(--text-muted); margin-bottom: 8px;
}
.match-item {
  display: inline-block;
  background: var(--surface); border: 1px solid var(--border);
  padding: 8px 14px; border-radius: var(--r-sm);
  font-size: 14px; margin: 0 6px 6px 0;
}
.match-answer { display: none; padding: 14px 16px; background: var(--accent-soft); border-radius: var(--r-md); margin-top: 10px; }
.match-answer.show { display: block; }
.match-answer .pair { font-size: 14px; padding: 4px 0; color: var(--text); }
.match-answer .pair strong { font-weight: 600; color: var(--accent); }
.match-answer .arr { color: var(--text-muted); margin: 0 6px; }

/* Result + explanation */
.q-result {
  font-family: var(--font-mono); font-size: 12px; font-weight: 600;
  letter-spacing: 0.04em;
  margin-top: 16px;
  padding: 8px 12px; border-radius: var(--r-sm);
  display: none;
}
.q-result.show { display: inline-block; animation: fadeUp .35s var(--ease-out); }
.q-result.pass { background: color-mix(in oklab, var(--success) 14%, var(--bg-elevated)); color: var(--success); }
.q-result.fail { background: color-mix(in oklab, var(--danger) 14%, var(--bg-elevated)); color: var(--danger); }
.q-result.skip { background: var(--surface-2); color: var(--text-muted); }
@keyframes fadeUp { from { opacity: 0; transform: translateY(4px); } }

.q-explanation {
  display: none;
  margin-top: 16px; padding: 18px 20px;
  background: var(--surface);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--r-md) var(--r-md) 0;
}
.q-explanation.show { display: block; animation: fadeUp .4s var(--ease-out); }
.ans-label {
  font-family: var(--font-mono); font-size: 10px; font-weight: 600;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--text-muted); margin-bottom: 4px;
}
.ans-value {
  font-family: var(--font-mono); font-size: 14px; font-weight: 600;
  color: var(--accent); margin-bottom: 12px;
}
.exp-text {
  font-size: 14px; line-height: 1.6; color: var(--text-dim);
  text-wrap: pretty;
}

/* ---------- Top action buttons (in topbar) ---------- */
.top-actions { display: flex; gap: 8px; }
.top-actions .btn { padding: 8px 16px; font-size: 13px; }
.top-actions .btn.retry { display: none; }
.top-actions .btn.retry.show { display: inline-flex; }

/* ---------- Scorecard ---------- */
.scorecard {
  max-width: 880px; margin: 24px auto;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  padding: 32px;
  box-shadow: var(--shadow-md);
  display: none;
  position: relative;
  overflow: hidden;
}
.scorecard.show { display: block; animation: scoreIn .55s var(--ease-out); }
@keyframes scoreIn { from { opacity: 0; transform: scale(.98) translateY(8px); } }
.scorecard::before {
  content: ''; position: absolute; inset: 0 0 auto 0; height: 4px;
  background: linear-gradient(90deg, var(--accent), color-mix(in oklab, var(--accent) 60%, white));
}
.sc-top {
  display: flex; justify-content: space-between; align-items: baseline;
  margin-bottom: 22px;
}
.sc-stamp {
  font-family: var(--font-mono); font-size: 11px; font-weight: 600;
  letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--text-muted);
}
.sc-title {
  font-family: var(--font-sans); font-size: 22px; font-weight: 700;
  letter-spacing: -0.02em; color: var(--text);
}
.sc-title em { font-style: normal; color: var(--accent); }
.sc-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 16px; align-items: end;
  margin-bottom: 20px;
}
.sc-pct {
  font-family: var(--font-sans); font-weight: 800;
  font-size: clamp(56px, 9vw, 88px); line-height: 1;
  letter-spacing: -0.04em;
  color: var(--text);
  display: flex; align-items: baseline;
}
.sc-pct em { font-style: normal; font-size: 0.4em; font-weight: 600; color: var(--accent); margin-left: 4px; }
.sc-cell {
  background: var(--surface);
  border-radius: var(--r-md);
  padding: 14px 16px;
}
.sc-cell .lbl {
  font-family: var(--font-mono); font-size: 10px; font-weight: 600;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--text-muted); margin-bottom: 4px;
}
.sc-cell .val {
  font-family: var(--font-sans); font-weight: 700; font-size: 32px;
  letter-spacing: -0.02em; color: var(--text);
  font-variant-numeric: tabular-nums;
}
.sc-cell .val.good { color: var(--success); }
.sc-cell .val.bad  { color: var(--danger); }
.sc-cell .val.mid  { color: var(--text-muted); }
.sc-verdict {
  font-size: 15px; line-height: 1.55; color: var(--text-dim);
  border-top: 1px solid var(--border); padding-top: 16px;
  text-wrap: pretty;
}
.sc-cta {
  display: flex; flex-wrap: wrap; gap: 10px;
  margin-top: 18px; padding-top: 18px;
  border-top: 1px solid var(--border);
  align-items: center;
}

/* ---------- Floating helpers ---------- */
.back-top {
  position: fixed; bottom: 24px; right: 24px;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--bg-elevated); color: var(--text);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-md);
  font-size: 18px; opacity: 0; pointer-events: none;
  transition: all var(--t-base);
  z-index: 80;
}
.back-top.show { opacity: 1; pointer-events: auto; }
.back-top:hover { color: var(--accent); transform: translateY(-2px); }

.keyhint {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%) translateY(20px);
  font-family: var(--font-mono); font-size: 12px;
  background: var(--text); color: var(--bg);
  padding: 9px 16px; border-radius: var(--r-pill);
  box-shadow: var(--shadow-md);
  opacity: 0; pointer-events: none;
  transition: all var(--t-base);
  z-index: 90;
}
.keyhint.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- Footer ---------- */
.qfooter {
  max-width: 880px; margin: 56px auto 32px;
  padding: 24px 24px 0; border-top: 1px solid var(--border);
  display: flex; justify-content: space-between; align-items: center;
  font-size: 13px; color: var(--text-muted);
}

/* ---------- Responsive ---------- */
@media (max-width: 760px) {
  .qtopbar-inner { grid-template-columns: auto 1fr auto; }
  .qcrumbs, .running-score { display: none; }
  .qhead { margin-top: 16px; }
  .qcard { padding: 20px; border-radius: var(--r-md); margin: 12px; }
  .opt-label { padding: 12px 14px; gap: 10px; }
  .opt-label .key-hint { display: none; }
  .opt-label .opt-text { font-size: 14px; }
  .sc-grid { grid-template-columns: 1fr 1fr; }
  .sc-pct { font-size: 56px; grid-column: 1 / -1; justify-content: center; }
  .ps-right { display: none; }
  .topic-header { padding: 0 16px; }
}


/* ---------- Preview-mode pill ---------- */
.preview-pill {
  display: inline-flex; align-items: center; gap: 8px;
  margin-top: 14px;
  padding: 6px 12px;
  background: color-mix(in oklab, var(--accent) 10%, var(--bg-elevated));
  border: 1px solid color-mix(in oklab, var(--accent) 28%, var(--border));
  color: var(--accent);
  border-radius: 999px;
  font-family: var(--font-mono); font-size: 11px; font-weight: 500;
  letter-spacing: 0.02em;
}
.preview-pill .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent);
  animation: pulse 1.8s ease-in-out infinite;
}