/* ── Design Tokens ───────────────────────────────────────────────────────── */
:root {
  --bg:           #080c14;
  --bg2:          #0d1220;
  --surface:      #111827;
  --surface2:     #1a2235;
  --surface3:     #212d42;
  --border:       rgba(255,255,255,.07);
  --border-light: rgba(255,255,255,.12);

  --accent:       #4f8ef7;
  --accent-glow:  rgba(79,142,247,.18);
  --accent-h:     #6ba3ff;
  --accent-dim:   rgba(79,142,247,.12);

  --green:        #22c55e;
  --green-glow:   rgba(34,197,94,.15);
  --green-dim:    rgba(34,197,94,.1);
  --red:          #ef4444;
  --red-glow:     rgba(239,68,68,.15);
  --red-dim:      rgba(239,68,68,.1);
  --yellow:       #f59e0b;
  --yellow-dim:   rgba(245,158,11,.12);

  --text:         #e2e8f4;
  --text-soft:    #94a3b8;
  --text-muted:   #5a6880;

  --radius:       16px;
  --radius-sm:    10px;
  --radius-xs:    6px;

  --shadow-sm:    0 1px 3px rgba(0,0,0,.4), 0 1px 2px rgba(0,0,0,.3);
  --shadow:       0 4px 20px rgba(0,0,0,.5), 0 1px 4px rgba(0,0,0,.3);
  --shadow-lg:    0 12px 48px rgba(0,0,0,.6), 0 4px 12px rgba(0,0,0,.4);
  --shadow-glow:  0 0 32px rgba(79,142,247,.12);

  --transition:   180ms cubic-bezier(.4,0,.2,1);
  --transition-slow: 350ms cubic-bezier(.4,0,.2,1);
}

/* ── Reset ───────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ── Base ────────────────────────────────────────────────────────────────── */
html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', 'DM Sans', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  font-size: clamp(14px, 1.8vw, 15px);
  -webkit-font-smoothing: antialiased;
}

/* Background grid texture */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.018) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
  z-index: 0;
}

/* ── Layout ──────────────────────────────────────────────────────────────── */
.container {
  position: relative;
  z-index: 1;
  max-width: 780px;
  margin: 0 auto;
  padding: 0 20px;
}

.page {
  display: none;
  padding: 32px 0 80px;
  animation: pageIn 280ms cubic-bezier(.4,0,.2,1);
}
.page.active { display: block; }

@keyframes pageIn {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── Card ────────────────────────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 32px 28px;
  box-shadow: var(--shadow), var(--shadow-glow);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,.12), transparent);
}

/* ── Typography ──────────────────────────────────────────────────────────── */
h1 {
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -.03em;
}
h2 {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  font-weight: 700;
  letter-spacing: -.02em;
}
h3 { font-size: 1rem; font-weight: 600; }

/* ── Site header (start page) ────────────────────────────────────────────── */
.site-header {
  text-align: center;
  padding: 48px 0 32px;
}

.site-logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
}

.logo-leaf {
  font-size: 1.6rem;
  color: var(--accent);
  filter: drop-shadow(0 0 8px var(--accent));
}

.logo-text {
  font-size: .75em;
  font-weight: 800;
  letter-spacing: .12em;
  color: var(--accent-h);
  text-transform: uppercase;
}

.site-title {
  background: linear-gradient(135deg, #e2e8f4 0%, #94a3b8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}

.site-subtitle {
  color: var(--text-soft);
  font-size: .97em;
  max-width: 380px;
  margin: 0 auto;
  line-height: 1.55;
}

/* Start card */
.start-card { margin-bottom: 24px; }

/* Feature pills */
.feature-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  padding: 0 0 8px;
}

.pill {
  padding: 6px 14px;
  background: var(--surface2);
  border: 1px solid var(--border-light);
  border-radius: 999px;
  font-size: .78em;
  font-weight: 600;
  color: var(--text-soft);
  white-space: nowrap;
}

/* ── Form elements ───────────────────────────────────────────────────────── */
.form-group { margin-bottom: 20px; }

label {
  display: block;
  font-size: .8em;
  font-weight: 600;
  color: var(--text-soft);
  letter-spacing: .04em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

input[type="text"],
select {
  width: 100%;
  padding: 13px 16px;
  background: var(--surface2);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: inherit;
  font-size: .97em;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
  -webkit-appearance: none;
  appearance: none;
}

input[type="text"]::placeholder { color: var(--text-muted); }

input[type="text"]:focus,
select:focus {
  border-color: var(--accent);
  background: var(--surface3);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%235a6880' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 40px;
  cursor: pointer;
}
select option { background: #1a2235; color: var(--text); }

/* ── Buttons ─────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  border: none;
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: .97em;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  letter-spacing: -.01em;
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0);
  transition: background var(--transition);
}
.btn:hover::after { background: rgba(255,255,255,.05); }
.btn:active { transform: scale(.97); }
.btn:disabled { opacity: .4; cursor: not-allowed; transform: none; }

.btn-primary {
  background: linear-gradient(135deg, #4f8ef7, #3b78e7);
  color: #fff;
  box-shadow: 0 2px 12px rgba(79,142,247,.35), inset 0 1px 0 rgba(255,255,255,.15);
}
.btn-primary:hover:not(:disabled) {
  box-shadow: 0 4px 20px rgba(79,142,247,.5), inset 0 1px 0 rgba(255,255,255,.15);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-soft);
  border: 1px solid var(--border-light);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

.btn-full  { width: 100%; }
.btn-sm    { padding: 8px 16px; font-size: .85em; border-radius: var(--radius-xs); }
.btn-next  { min-width: 160px; }

.btn-icon  { font-style: normal; }
.nav-arrow { opacity: .7; }

/* ── Progress ────────────────────────────────────────────────────────────── */
.quiz-header {
  padding: 12px 0 24px;
  position: relative;
  z-index: 1;
}

.progress-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

/* JS outputs .progress-label-text */
.progress-label-text {
  font-size: .82em;
  font-weight: 600;
  color: var(--text-soft);
}

.progress-track {
  height: 4px;
  background: var(--surface3);
  border-radius: 999px;
  overflow: hidden;
  position: relative;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-h));
  border-radius: 999px;
  transition: width .5s cubic-bezier(.4,0,.2,1);
  box-shadow: 0 0 8px rgba(79,142,247,.6);
}

/* ── Question area ───────────────────────────────────────────────────────── */
.question-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.question-module-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  background: var(--accent-dim);
  border: 1px solid rgba(79,142,247,.2);
  border-radius: 999px;
  color: var(--accent-h);
  font-size: .75em;
  font-weight: 700;
  letter-spacing: .05em;
  text-transform: uppercase;
}

.question-counter {
  font-size: .8em;
  color: var(--text-muted);
  font-weight: 500;
}

.question-text {
  font-size: clamp(1rem, 2.2vw, 1.1rem);
  font-weight: 500;
  line-height: 1.7;
  color: var(--text);
  margin-bottom: 28px;
}

/* ── Options ─────────────────────────────────────────────────────────────── */
.options {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.option-btn {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 16px;
  background: var(--surface2);
  border: 1.5px solid var(--border-light);
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-align: left;
  color: var(--text);
  font-family: inherit;
  font-size: .95em;
  line-height: 1.55;
  transition: all var(--transition);
  width: 100%;
  position: relative;
  overflow: hidden;
}

.option-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(79,142,247,.04), transparent);
  opacity: 0;
  transition: opacity var(--transition);
}

.option-btn:hover:not(:disabled):not(.answered) {
  border-color: var(--accent);
  background: var(--surface3);
  transform: translateX(3px);
  box-shadow: -3px 0 0 var(--accent), var(--shadow-sm);
}
.option-btn:hover:not(:disabled):not(.answered)::before { opacity: 1; }
.option-btn:disabled { cursor: default; }

.option-letter {
  flex-shrink: 0;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  background: var(--surface3);
  border: 1px solid var(--border-light);
  font-weight: 700;
  font-size: .82em;
  transition: all var(--transition);
  color: var(--text-soft);
}

.option-text { flex: 1; }

/* Correct state */
.option-btn.correct {
  border-color: var(--green);
  background: var(--green-dim);
  box-shadow: 0 0 0 1px rgba(34,197,94,.15), var(--shadow-sm);
}
.option-btn.correct .option-letter {
  background: var(--green);
  border-color: var(--green);
  color: #052e16;
  font-weight: 800;
}

/* Wrong state */
.option-btn.wrong {
  border-color: var(--red);
  background: var(--red-dim);
}
.option-btn.wrong .option-letter {
  background: var(--red);
  border-color: var(--red);
  color: #fff;
  font-weight: 800;
}

/* Highlight correct when wrong chosen */
.option-btn.highlight {
  border-color: var(--green);
  background: var(--green-dim);
  box-shadow: 0 0 0 2px rgba(34,197,94,.2), var(--shadow-sm);
  animation: highlightPulse .5s ease;
}
.option-btn.highlight .option-letter {
  background: var(--green);
  border-color: var(--green);
  color: #052e16;
  font-weight: 800;
}

@keyframes highlightPulse {
  0%   { transform: scale(1); }
  50%  { transform: scale(1.01); }
  100% { transform: scale(1); }
}

/* ── Teaching Feedback Panel ─────────────────────────────────────────────── */
/* JS injects .feedback-panel inside #feedbackPanel — always shown when present */
.feedback-panel {
  margin-top: 28px;
  border-radius: var(--radius);
  overflow: hidden;
  animation: feedbackIn 300ms cubic-bezier(.4,0,.2,1);
  box-shadow: var(--shadow-lg);
}

@keyframes feedbackIn {
  from { opacity: 0; transform: translateY(10px) scale(.99); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

/* Correct panel */
.correct-panel {
  border: 1px solid rgba(34,197,94,.25);
  background: rgba(34,197,94,.04);
  padding: 20px;
}

/* Wrong panel */
.wrong-panel {
  border: 1px solid rgba(239,68,68,.2);
  background: var(--surface);
}

/* ── Verdict row ─────────────────────────────────────────────────────────── */
.feedback-verdict {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}

.feedback-verdict.correct {
  background: linear-gradient(135deg, #052e16, #064e22);
  border-bottom-color: rgba(34,197,94,.2);
}

.feedback-verdict.wrong {
  background: linear-gradient(135deg, #1c0a0a, #2d1010);
  border-bottom-color: rgba(239,68,68,.15);
}

/* For correct-panel, verdict is inside the panel without a border-bottom container */
.correct-panel .feedback-verdict {
  background: none;
  border-bottom: none;
  padding: 0 0 16px;
}

.verdict-icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: 800;
}

.feedback-verdict.correct .verdict-icon {
  background: rgba(34,197,94,.2);
  color: var(--green);
}

.feedback-verdict.wrong .verdict-icon {
  background: rgba(239,68,68,.2);
  color: var(--red);
}

.verdict-text {
  font-size: 1rem;
  font-weight: 700;
}

.feedback-verdict.correct .verdict-text { color: var(--green); }
.feedback-verdict.wrong   .verdict-text { color: var(--red); }

/* ── Wrong comparison blocks ─────────────────────────────────────────────── */
.wrong-comparison {
  padding: 20px 20px 0;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 12px;
  align-items: center;
}

.comparison-block {
  padding: 14px;
  border-radius: var(--radius-sm);
  border: 1px solid;
}

.comparison-block.chosen-block {
  background: var(--red-dim);
  border-color: rgba(239,68,68,.2);
}

.comparison-block.correct-block {
  background: var(--green-dim);
  border-color: rgba(34,197,94,.2);
}

.comparison-arrow {
  font-size: 1.1rem;
  color: var(--text-muted);
  text-align: center;
  flex-shrink: 0;
}

.comparison-label {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 8px;
}

.comp-badge {
  font-size: .68em;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  padding: 2px 7px;
  border-radius: 4px;
}

.badge-wrong  { background: rgba(239,68,68,.2);  color: var(--red); }
.badge-correct { background: rgba(34,197,94,.2); color: var(--green); }

.comp-letter {
  display: inline-flex;
  width: 22px;
  height: 22px;
  align-items: center;
  justify-content: center;
  border-radius: 5px;
  font-size: .78em;
  font-weight: 800;
}

.chosen-block  .comp-letter { background: var(--red);   color: #fff; }
.correct-block .comp-letter { background: var(--green); color: #052e16; }

.comparison-text {
  font-size: .9em;
  font-weight: 500;
  color: var(--text);
  line-height: 1.5;
}

/* ── Why-wrong section ───────────────────────────────────────────────────── */
.feedback-why {
  display: flex;
  gap: 14px;
  margin: 16px 20px 0;
  padding: 14px 16px;
  background: rgba(245,158,11,.06);
  border: 1px solid rgba(245,158,11,.15);
  border-radius: var(--radius-sm);
}

.why-icon {
  flex-shrink: 0;
  font-size: 1rem;
  color: var(--yellow);
  margin-top: 1px;
}

.why-body { flex: 1; }

.why-label {
  font-size: .72em;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--yellow);
  margin-bottom: 5px;
}

.why-text {
  font-size: .9em;
  color: var(--text-soft);
  line-height: 1.6;
}

/* ── Explanation section (shared by both panels and results) ──────────────── */
.feedback-explanation {
  display: flex;
  gap: 14px;
  margin: 16px 20px 20px;
  padding: 14px 16px;
  background: rgba(79,142,247,.06);
  border: 1px solid rgba(79,142,247,.15);
  border-radius: var(--radius-sm);
}

/* Inside correct-panel the explanation has no side margin */
.correct-panel .feedback-explanation {
  margin: 0;
  margin-top: 12px;
}

.explanation-icon {
  flex-shrink: 0;
  font-size: 1rem;
  color: var(--accent-h);
  margin-top: 1px;
}

.explanation-body { flex: 1; }

.explanation-label {
  font-size: .72em;
  font-weight: 700;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--accent-h);
  margin-bottom: 5px;
}

.explanation-text {
  font-size: .9em;
  color: var(--text);
  line-height: 1.7;
}

/* ── Quiz nav ────────────────────────────────────────────────────────────── */
.quiz-nav {
  margin-top: 24px;
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  align-items: center;
}

/* ── Results page ────────────────────────────────────────────────────────── */
.results-header {
  text-align: center;
  padding: 40px 0 28px;
}

.results-header h1 { color: var(--text); margin-bottom: 8px; }

.results-restart {
  margin-top: 28px;
}

/* ── Score ring ──────────────────────────────────────────────────────────── */
.score-section {
  margin-bottom: 28px;
}

.score-ring-wrap {
  display: flex;
  justify-content: center;
  position: relative;
  margin: 0 0 24px;
  height: 160px;
}

/* JS renders svg.score-ring directly */
svg.score-ring {
  width: 160px;
  height: 160px;
  transform: rotate(-90deg);
  filter: drop-shadow(0 0 16px rgba(79,142,247,.2));
  overflow: visible;
}

svg.score-ring circle {
  fill: none;
  stroke-width: 11;
  stroke-linecap: round;
}

svg.score-ring .ring-track { stroke: var(--surface3); }
svg.score-ring .ring-fill {
  stroke: var(--accent);
  transition: stroke-dashoffset 1.2s cubic-bezier(.4,0,.2,1);
}

/* Color variants — JS uses: excellent, good, warning, bad */
svg.score-ring .ring-fill.excellent { stroke: var(--green);  filter: drop-shadow(0 0 8px rgba(34,197,94,.6)); }
svg.score-ring .ring-fill.good      { stroke: var(--green);  filter: drop-shadow(0 0 8px rgba(34,197,94,.5)); }
svg.score-ring .ring-fill.warning   { stroke: var(--yellow); filter: drop-shadow(0 0 8px rgba(245,158,11,.5)); }
svg.score-ring .ring-fill.bad       { stroke: var(--red);    filter: drop-shadow(0 0 8px rgba(239,68,68,.5)); }

.score-center {
  position: absolute;
  top: 0; left: 50%;
  transform: translateX(-50%);
  width: 160px;
  height: 160px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

.score-pct {
  font-size: 2.2rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--text);
}
.score-pct.excellent { color: var(--green); }
.score-pct.good      { color: var(--green); }
.score-pct.warning   { color: var(--yellow); }
.score-pct.bad       { color: var(--red); }

.score-perf {
  font-size: .72rem;
  color: var(--text-muted);
  margin-top: 5px;
  font-weight: 500;
  text-align: center;
}

/* ── Stat cards ──────────────────────────────────────────────────────────── */
.stats-row {
  display: grid;
  grid-template-columns: repeat(3,1fr);
  gap: 12px;
  margin-bottom: 28px;
}

.stat-box {
  background: var(--surface2);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 16px 12px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.stat-box::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--accent);
}

.stat-value {
  font-size: 1.8rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--text);
}
/* JS uses .stat-value .correct / .wrong as sibling spans, not nested classes */
.stat-value.correct { color: var(--green); }
.stat-value.wrong   { color: var(--red); }

.stat-name {
  font-size: .75em;
  color: var(--text-muted);
  margin-top: 5px;
  font-weight: 500;
}

/* ── Module breakdown card ───────────────────────────────────────────────── */
.breakdown-card {
  margin-bottom: 24px;
}

.section-title {
  font-size: clamp(1rem, 2.5vw, 1.15rem);
  font-weight: 700;
  letter-spacing: -.02em;
  margin-bottom: 18px;
  color: var(--text);
}

.module-row {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  margin-bottom: 10px;
  transition: border-color var(--transition);
}
.module-row:hover { border-color: var(--border-light); }

.module-row-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.module-name {
  font-size: .9em;
  font-weight: 600;
  color: var(--text);
  flex: 1;
  padding-right: 12px;
}

.module-pct {
  font-size: .85em;
  font-weight: 700;
  flex-shrink: 0;
}
.module-pct.good    { color: var(--green); }
.module-pct.warning { color: var(--yellow); }
.module-pct.bad     { color: var(--red); }

.module-bar-bg {
  height: 6px;
  background: var(--surface3);
  border-radius: 999px;
  overflow: hidden;
}

.module-bar-fill {
  height: 100%;
  border-radius: 999px;
  transition: width .9s cubic-bezier(.4,0,.2,1);
  width: 0;
  background: var(--accent);
}
.module-bar-fill.good    { background: var(--green); }
.module-bar-fill.warning { background: var(--yellow); }
.module-bar-fill.bad     { background: var(--red); }

/* ── Wrong answers review card ───────────────────────────────────────────── */
.wrong-review-card {
  margin-bottom: 28px;
}

.wrong-item {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  overflow: hidden;
  transition: border-color var(--transition);
}
.wrong-item:hover { border-color: rgba(239,68,68,.25); }

.wrong-item-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}

.wrong-item-num {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--red-dim);
  border: 1px solid rgba(239,68,68,.2);
  border-radius: 6px;
  font-size: .72em;
  font-weight: 800;
  color: var(--red);
}

.wrong-q-text {
  font-size: .92em;
  line-height: 1.6;
  color: var(--text);
  font-weight: 500;
  padding: 14px 16px 0;
}

/* Wrong comparison inside result items reuses the same .wrong-comparison grid */
.wrong-item .wrong-comparison {
  padding: 14px 16px;
  margin: 0;
}

/* Explanation inside wrong-item */
.wrong-item .feedback-explanation {
  margin: 0 16px 16px;
}

/* ── Toast ───────────────────────────────────────────────────────────────── */
#toast {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%) translateY(16px);
  background: var(--surface3);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  padding: 12px 22px;
  font-size: .88em;
  font-weight: 500;
  opacity: 0;
  transition: opacity .22s, transform .22s;
  pointer-events: none;
  z-index: 9999;
  white-space: nowrap;
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(12px);
}
#toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ── Spinner ─────────────────────────────────────────────────────────────── */
.spinner {
  display: inline-block;
  width: 20px; height: 20px;
  border: 2.5px solid var(--surface3);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin .7s linear infinite;
  vertical-align: middle;
}
@keyframes spin { to { transform: rotate(360deg); } }

.loading-center {
  display: flex;
  justify-content: center;
  padding: 48px 0;
}

/* ── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 520px) {
  .card { padding: 22px 18px; }

  .wrong-comparison { grid-template-columns: 1fr; }
  .comparison-arrow { display: none; }

  .quiz-nav { flex-direction: column-reverse; }
  .quiz-nav .btn { width: 100%; }

  .stats-row { gap: 8px; }
  .stat-box { padding: 12px 8px; }
  .stat-value { font-size: 1.5rem; }

  svg.score-ring { width: 140px; height: 140px; }
  .score-ring-wrap { height: 140px; }
  .score-center { width: 140px; height: 140px; }
}

@media (max-width: 380px) {
  .stats-row { grid-template-columns: repeat(3,1fr); }
  .feature-pills { gap: 6px; }
  .pill { font-size: .72em; padding: 5px 10px; }
}