:root {
  --bg: #0f1419;
  --bg-elev: #171e26;
  --bg-soft: #1e2833;
  --line: #2c3a48;
  --text: #e8eef4;
  --muted: #8fa3b5;
  --accent: #2bb8a9;
  --accent-dim: rgba(43, 184, 169, 0.15);
  --warn: #e6a23c;
  --danger: #e45c5c;
  --ok: #3dce7c;
  --radius: 12px;
  --font: "Source Sans 3", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(1200px 600px at 10% -10%, #1a3a36 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, #243044 0%, transparent 50%),
    var(--bg);
  color: var(--text);
  font-family: var(--font);
}

button,
input {
  font: inherit;
}

.view {
  display: none;
  min-height: 100vh;
}

.view.active {
  display: block;
}

.topbar,
.exam-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--line);
  background: rgba(15, 20, 25, 0.85);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 20;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand strong {
  display: block;
  font-size: 1rem;
}

.brand .muted,
.muted {
  color: var(--muted);
  font-size: 0.85rem;
}

.brand-mark {
  width: 2rem;
  height: 2rem;
  border-radius: 8px;
  background:
    linear-gradient(135deg, var(--accent), #1a7f95);
  box-shadow: 0 0 0 1px rgba(43, 184, 169, 0.35);
}

.pill {
  font-size: 0.8rem;
  color: var(--muted);
  border: 1px solid var(--line);
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  background: var(--bg-elev);
}

.landing {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}

.kicker {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.75rem;
  color: var(--accent);
  font-weight: 600;
  margin: 0 0 0.5rem;
}

.hero-copy h1 {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1.15;
  margin: 0 0 0.75rem;
}

.lede {
  color: #c5d2de;
  max-width: 42rem;
  line-height: 1.55;
  margin: 0 0 1.25rem;
}

.facts {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  list-style: none;
  padding: 0;
  margin: 0 0 2rem;
  color: var(--muted);
}

.facts strong {
  color: var(--text);
}

.mode-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.mode-card {
  text-align: left;
  color: inherit;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem;
  cursor: pointer;
  transition: border-color 0.15s, transform 0.15s, background 0.15s;
}

.mode-card:hover,
.mode-card:focus-visible {
  border-color: var(--accent);
  background: var(--bg-soft);
  transform: translateY(-2px);
  outline: none;
}

.mode-card h2 {
  margin: 0.35rem 0 0.35rem;
  font-size: 1.25rem;
}

.mode-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.45;
}

.mode-stats {
  color: var(--text) !important;
  font-family: var(--mono);
  margin-bottom: 0.65rem !important;
}

.mode-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 0.2rem 0.45rem;
  border-radius: 6px;
}

.mode-tag.alt {
  color: var(--warn);
  background: rgba(230, 162, 60, 0.15);
}

.syllabus {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-elev);
  padding: 0.85rem 1rem;
}

.syllabus summary {
  cursor: pointer;
  font-weight: 600;
}

.domain-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.9rem 0;
}

.domain-chips span {
  font-size: 0.78rem;
  padding: 0.25rem 0.55rem;
  border-radius: 999px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  color: #b7c7d6;
}

.fine {
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.5;
}

.exam-bar {
  flex-wrap: wrap;
}

.timer {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 8rem;
  padding: 0.35rem 0.85rem;
  border-radius: 10px;
  background: var(--bg-elev);
  border: 1px solid var(--line);
}

.timer.warn {
  border-color: var(--warn);
  color: var(--warn);
}

.timer.critical {
  border-color: var(--danger);
  color: var(--danger);
  animation: pulse 1s infinite;
}

@keyframes pulse {
  50% {
    opacity: 0.75;
  }
}

.timer-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.timer-value {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 1.25rem;
}

.exam-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 1rem;
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 1.25rem 2rem;
}

.palette {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.85rem;
  height: fit-content;
  position: sticky;
  top: 5.5rem;
}

.palette-head {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  margin-bottom: 0.65rem;
}

.palette-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.35rem;
}

.palette-grid button {
  aspect-ratio: 1;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--bg);
  color: var(--text);
  font-family: var(--mono);
  font-size: 0.75rem;
  cursor: pointer;
}

.palette-grid button.answered {
  background: rgba(61, 206, 124, 0.18);
  border-color: rgba(61, 206, 124, 0.45);
}

.palette-grid button.flagged {
  box-shadow: inset 0 0 0 2px var(--warn);
}

.palette-grid button.current {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.legend {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin-top: 0.75rem;
  font-size: 0.75rem;
  color: var(--muted);
}

.dot {
  display: inline-block;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  margin-right: 0.35rem;
  background: var(--line);
}

.dot.current {
  background: var(--accent);
}

.dot.answered {
  background: var(--ok);
}

.dot.flagged {
  background: var(--warn);
}

.question-panel {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem;
  min-height: 420px;
}

.domain-badge {
  display: inline-block;
  margin: 0 0 0.75rem;
  font-size: 0.78rem;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 0.25rem 0.55rem;
  border-radius: 6px;
  font-weight: 600;
}

.question-panel h2 {
  margin: 0 0 1.25rem;
  font-size: 1.2rem;
  line-height: 1.4;
  font-weight: 600;
}

.choices {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.choice {
  display: flex;
  gap: 0.75rem;
  align-items: flex-start;
  width: 100%;
  text-align: left;
  padding: 0.85rem 1rem;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--bg);
  color: inherit;
  cursor: pointer;
  transition: border-color 0.12s, background 0.12s;
}

.choice:hover,
.choice:focus-visible {
  border-color: #4a6278;
  outline: none;
}

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

.choice .letter {
  font-family: var(--mono);
  font-weight: 600;
  color: var(--muted);
  min-width: 1.25rem;
}

.nav-row {
  display: flex;
  justify-content: space-between;
  margin-top: 1.5rem;
  gap: 0.75rem;
}

.btn {
  border: 1px solid var(--line);
  background: var(--bg-soft);
  color: var(--text);
  border-radius: 9px;
  padding: 0.55rem 1rem;
  cursor: pointer;
  font-weight: 600;
}

.btn:hover,
.btn:focus-visible {
  border-color: #4a6278;
  outline: none;
}

.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #06221f;
}

.btn.danger {
  background: rgba(228, 92, 92, 0.15);
  border-color: rgba(228, 92, 92, 0.55);
  color: #ffb4b4;
}

.btn.ghost {
  background: transparent;
}

.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.results {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

.score-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-elev);
  padding: 1.75rem;
  margin-bottom: 1.5rem;
}

.score-card.pass {
  border-color: rgba(61, 206, 124, 0.5);
}

.score-card.fail {
  border-color: rgba(228, 92, 92, 0.5);
}

.score-card h1 {
  font-family: var(--mono);
  font-size: 3rem;
  margin: 0.25rem 0 0.5rem;
}

.domain-scores,
.review {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-elev);
  padding: 1.25rem;
  margin-bottom: 1.25rem;
}

.domain-scores h2,
.review h2 {
  margin: 0 0 1rem;
  font-size: 1.1rem;
}

.domain-row {
  display: grid;
  grid-template-columns: minmax(8rem, 12rem) 1fr auto;
  gap: 0.65rem;
  align-items: center;
  margin-bottom: 0.55rem;
  font-size: 0.9rem;
}

.bar {
  height: 0.55rem;
  background: var(--bg);
  border-radius: 999px;
  overflow: hidden;
}

.bar > span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, #1f8f82, var(--accent));
}

.review-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.toggle {
  font-size: 0.9rem;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.review-item {
  border-top: 1px solid var(--line);
  padding: 1rem 0;
}

.review-item h3 {
  margin: 0 0 0.5rem;
  font-size: 1rem;
}

.review-item .tag {
  font-size: 0.75rem;
  font-weight: 700;
  margin-right: 0.4rem;
}

.review-item .tag.ok {
  color: var(--ok);
}

.review-item .tag.bad {
  color: var(--danger);
}

.review-item .explain {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0.5rem 0 0;
}

.result-actions {
  display: flex;
  gap: 0.75rem;
}

.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.55);
  display: grid;
  place-items: center;
  z-index: 50;
  padding: 1rem;
}

.modal.hidden {
  display: none;
}

.modal-card {
  width: min(420px, 100%);
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem;
}

.modal-card h3 {
  margin: 0 0 0.5rem;
}

.modal-card p {
  color: var(--muted);
  margin: 0 0 1rem;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
}

@media (max-width: 900px) {
  .mode-grid {
    grid-template-columns: 1fr;
  }

  .exam-layout {
    grid-template-columns: 1fr;
  }

  .palette {
    position: static;
  }

  .domain-row {
    grid-template-columns: 1fr;
  }
}