:root {
  --bg: #f4f7fb;
  --card: #ffffff;
  --text: #14213d;
  --muted: #5f6c7b;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --border: #dbe4f0;
  --danger: #b42318;
  --danger-bg: #fff4f2;
  --success: #047857;
  --shadow: 0 20px 45px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(37, 99, 235, 0.14), transparent 32rem),
    var(--bg);
  color: var(--text);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  line-height: 1.5;
}

code {
  padding: 0.12rem 0.35rem;
  border-radius: 0.35rem;
  background: #eef4ff;
  color: #174ea6;
  font-size: 0.95em;
}

.container {
  width: min(100% - 2rem, 960px);
  margin-inline: auto;
}

.site-header {
  border-bottom: 1px solid rgba(219, 228, 240, 0.75);
  background: rgba(255, 255, 255, 0.76);
  backdrop-filter: blur(16px);
}

.site-header .container {
  display: flex;
  align-items: center;
  min-height: 4.5rem;
}

.brand {
  color: var(--text);
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  text-decoration: none;
}

.page-shell {
  padding-block: clamp(2rem, 6vw, 5rem);
}

.card {
  border: 1px solid var(--border);
  border-radius: 1.5rem;
  background: var(--card);
  box-shadow: var(--shadow);
  padding: clamp(1.25rem, 3vw, 2.25rem);
}

.card.compact {
  padding: 1.25rem 1.5rem;
}

.hero {
  max-width: 760px;
}

.hidden {
  display: none !important;
}

.eyebrow {
  margin: 0 0 0.5rem;
  color: var(--primary);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
  letter-spacing: -0.04em;
  line-height: 1.1;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.4rem);
}

h2 {
  font-size: clamp(1.35rem, 3vw, 2rem);
}

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

.description {
  margin: 1rem 0 0;
  font-size: 1.08rem;
}

.test-meta,
.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.test-meta div,
.result-card {
  border: 1px solid var(--border);
  border-radius: 1rem;
  background: #f8fbff;
  padding: 1rem;
}

.test-meta dt,
.result-card span {
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 700;
}

.test-meta dd,
.result-card strong {
  display: block;
  margin: 0.25rem 0 0;
  color: var(--text);
  font-size: 1.35rem;
  font-weight: 800;
}

.score-chart {
  display: grid;
  grid-template-columns: minmax(10rem, 14rem) 1fr;
  gap: clamp(1rem, 4vw, 2rem);
  align-items: center;
  border: 1px solid var(--border);
  border-radius: 1.25rem;
  background: linear-gradient(135deg, #f8fbff, #eef4ff);
  margin: 1.5rem 0 0.75rem;
  padding: clamp(1rem, 3vw, 1.5rem);
}

.score-meter {
  --score: 0;
  display: grid;
  place-items: center;
  align-content: center;
  justify-self: center;
  width: min(100%, 13rem);
  aspect-ratio: 1;
  border-radius: 50%;
  background:
    radial-gradient(circle closest-side, #ffffff 72%, transparent 73%),
    conic-gradient(var(--primary) calc(var(--score) * 1%), #dbe4f0 0);
  box-shadow: inset 0 0 0 1px rgba(219, 228, 240, 0.9);
  text-align: center;
}

.score-meter strong {
  color: var(--text);
  font-size: clamp(2rem, 6vw, 3rem);
  line-height: 1;
}

.score-meter span,
.score-chart__note {
  color: var(--muted);
}

.score-meter span {
  font-weight: 800;
}

.score-bars {
  display: grid;
  gap: 1rem;
}

.score-bar {
  display: grid;
  gap: 0.45rem;
}

.score-bar__heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-weight: 800;
}

.score-bar__heading span {
  color: var(--muted);
}

.score-bar__track {
  overflow: hidden;
  height: 0.9rem;
  border-radius: 999px;
  background: #dbe4f0;
}

.score-bar__fill {
  display: block;
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--primary), #14b8a6);
}

.score-chart__note {
  margin: 0 0 1.5rem;
  font-size: 0.95rem;
}

.instructions {
  margin: 0 0 1.5rem;
  border-left: 4px solid var(--primary);
  border-radius: 0.75rem;
  background: #eef4ff;
  padding: 1rem;
  color: #23406f;
  white-space: pre-line;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.9rem;
  border: 0;
  border-radius: 999px;
  background: var(--primary);
  color: #ffffff;
  cursor: pointer;
  font: inherit;
  font-weight: 800;
  padding: 0.75rem 1.35rem;
  transition:
    background 160ms ease,
    transform 160ms ease,
    box-shadow 160ms ease;
}

.button:hover {
  background: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 12px 20px rgba(37, 99, 235, 0.2);
}

.button:disabled {
  background: #9aa8bb;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.button.secondary {
  border: 1px solid var(--border);
  background: #ffffff;
  color: var(--text);
}

.button.secondary:hover {
  background: #f8fbff;
  box-shadow: 0 12px 20px rgba(15, 23, 42, 0.08);
}

.button.flagged {
  border-color: #facc15;
  background: #fef9c3;
  color: #713f12;
}

.alert {
  border-color: #ffd1cc;
  background: var(--danger-bg);
}

.alert .eyebrow,
.alert h1 {
  color: var(--danger);
}

.quiz-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.quiz-topbar h1 {
  font-size: clamp(1.35rem, 3vw, 2rem);
}

.timer {
  border-radius: 999px;
  background: #ecfdf5;
  color: var(--success);
  font-weight: 900;
  padding: 0.65rem 1rem;
  white-space: nowrap;
}

.timer.warning {
  background: #fff7ed;
  color: #c2410c;
}

.question-card {
  margin-bottom: 1rem;
}

.question-status {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
  color: var(--muted);
  font-weight: 700;
}

.answers {
  display: grid;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.answer-option {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.75rem;
  align-items: start;
  border: 1px solid var(--border);
  border-radius: 1rem;
  background: #ffffff;
  cursor: pointer;
  padding: 1rem;
}

.answer-option:has(input:checked) {
  border-color: var(--primary);
  background: #eef4ff;
}

.answer-option.correct {
  border-color: #86efac;
  background: #f0fdf4;
}

.answer-option.incorrect {
  border-color: #fca5a5;
  background: #fff1f2;
}

.answer-option input {
  margin-top: 0.25rem;
}

.answer-explanation {
  margin-top: 1rem;
  border: 1px solid #bfdbfe;
  border-left: 4px solid var(--primary);
  border-radius: 1rem;
  background: #eff6ff;
  padding: 1rem;
  color: #1e3a8a;
}

.answer-explanation strong {
  display: block;
  margin-bottom: 0.35rem;
}

.answer-explanation p {
  margin: 0;
  white-space: pre-line;
}

.quiz-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: flex-end;
}

.question-palette-card {
  margin-top: 1rem;
}

.question-palette-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
}

.question-palette-header h2 {
  font-size: clamp(1.1rem, 2vw, 1.4rem);
}

.question-palette-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: flex-end;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 800;
}

.question-palette-legend span {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.status-dot {
  display: inline-block;
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 999px;
}

.status-dot.attempted,
.question-jump.attempted {
  background: #dcfce7;
  color: #166534;
}

.status-dot.flagged,
.question-jump.flagged {
  background: #fef3c7;
  color: #92400e;
}

.status-dot.unattempted,
.question-jump.unattempted {
  background: #fee2e2;
  color: #991b1b;
}

.question-palette {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(2.75rem, 1fr));
  gap: 0.55rem;
  margin-top: 1rem;
}

.question-jump {
  min-height: 2.75rem;
  border: 1px solid transparent;
  border-radius: 0.85rem;
  cursor: pointer;
  font: inherit;
  font-weight: 900;
  transition:
    border-color 160ms ease,
    box-shadow 160ms ease,
    transform 160ms ease;
}

.question-jump:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 18px rgba(15, 23, 42, 0.12);
}

.question-jump.attempted {
  border-color: #86efac;
}

.question-jump.flagged {
  border-color: #facc15;
}

.question-jump.unattempted {
  border-color: #fca5a5;
}

.question-jump.current {
  outline: 3px solid rgba(37, 99, 235, 0.28);
  outline-offset: 2px;
}

@media (max-width: 640px) {
  .quiz-topbar,
  .question-status,
  .question-palette-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .score-chart {
    grid-template-columns: 1fr;
  }

  .quiz-actions {
    justify-content: stretch;
  }

  .quiz-actions .button {
    flex: 1 1 100%;
  }

  .question-palette-legend {
    justify-content: flex-start;
  }
}