:root {
  color-scheme: light dark;
  --fg: #1a1a1a;
  --bg: #ffffff;
  --muted: #6b6b6b;
  --border: #d8d8d8;
  --accent: #0078d4;
  --navy: #16305c;
  --navy-dark: #0b1c38;
  --navy-light: #24406e;
  --sidebar-bg: #f5f5f7;
  --pill-bg: #4a4a4a;
  --pill-fg: #ffffff;
  --alert-bg: #fdf6d8;
  --alert-border: #e8d98a;
  --alert-fg: #4a3f0a;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #eaeaea;
    --bg: #1e1e1e;
    --muted: #9a9a9a;
    --border: #3a3a3a;
    --accent: #4cc2ff;
    --navy: #3b5c96;
    --navy-dark: #0b1c38;
    --navy-light: #2c4a7c;
    --sidebar-bg: #26262a;
    --pill-bg: #5a5a5a;
    --pill-fg: #ffffff;
    --alert-bg: #3a3216;
    --alert-border: #6b5c22;
    --alert-fg: #f0e6b0;
  }
}

:root[data-theme="light"] {
  --fg: #1a1a1a;
  --bg: #ffffff;
  --muted: #6b6b6b;
  --border: #d8d8d8;
  --accent: #0078d4;
  --navy: #16305c;
  --navy-light: #24406e;
  --sidebar-bg: #f5f5f7;
  --pill-bg: #4a4a4a;
  --alert-bg: #fdf6d8;
  --alert-border: #e8d98a;
  --alert-fg: #4a3f0a;
}

:root[data-theme="dark"] {
  --fg: #eaeaea;
  --bg: #1e1e1e;
  --muted: #9a9a9a;
  --border: #3a3a3a;
  --accent: #4cc2ff;
  --navy: #3b5c96;
  --navy-light: #2c4a7c;
  --sidebar-bg: #26262a;
  --pill-bg: #5a5a5a;
  --alert-bg: #3a3216;
  --alert-border: #6b5c22;
  --alert-fg: #f0e6b0;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.5;
}

.muted {
  color: var(--muted);
  font-size: 0.9rem;
}

.small {
  font-size: 0.85rem;
}

/* ---------- App shell (sidebar + main) ---------- */

.app-shell {
  display: flex;
  min-height: 100vh;
  align-items: stretch;
}

.exam-toolbar {
  width: 220px;
  flex-shrink: 0;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  padding: 1rem 0.75rem;
}

.exam-toolbar.collapsed {
  width: 56px;
  padding: 1rem 0.4rem;
}

.exam-toolbar.collapsed .toolbar-label,
.exam-toolbar.collapsed .toolbar-title,
.exam-toolbar.collapsed .toolbar-detail {
  display: none;
}

.toolbar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin-bottom: 1rem;
  padding: 0 0.4rem;
}

.toolbar-collapse-btn {
  background: none;
  border: 1px dashed var(--border);
  border-radius: 4px;
  cursor: pointer;
  color: var(--fg);
  padding: 0.2rem 0.4rem;
  font-size: 0.9rem;
}

.toolbar-nav {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.toolbar-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.5rem 0.4rem;
  border-radius: 6px;
  font-size: 0.9rem;
}

button.toolbar-item {
  border: none;
  background: none;
  color: var(--fg);
  cursor: pointer;
  width: 100%;
  text-align: left;
  font-family: inherit;
}

button.toolbar-item:hover {
  background: color-mix(in srgb, var(--navy) 10%, transparent);
}

.toolbar-icon {
  font-size: 1.1rem;
  width: 1.4rem;
  text-align: center;
}

.toolbar-detail {
  padding: 0.3rem 0.4rem 1rem 2.2rem;
}

.toolbar-stepper {
  list-style: none;
  margin: 0 0 0.4rem;
  padding: 0;
  border-left: 2px solid var(--border);
}

.toolbar-stepper li {
  position: relative;
  padding: 0.15rem 0 0.15rem 0.8rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.toolbar-stepper li::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 0.4rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--border);
}

.toolbar-stepper li.done {
  color: var(--fg);
}

.toolbar-stepper li.done::before {
  background: var(--navy);
}

.toolbar-stepper li.current {
  color: var(--navy);
  font-weight: 700;
}

.toolbar-stepper li.current::before {
  background: var(--navy);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--navy) 25%, transparent);
}

.toolbar-step {
  font-size: 0.8rem;
  margin: 0;
}

.app-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.app-header {
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--border);
}

.app-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border);
}

main {
  flex: 1;
  max-width: 800px;
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem;
}

/* ---------- Start / results cards ---------- */

.start-view,
.results-view {
  display: flex;
  justify-content: center;
  padding-top: 1rem;
}

.start-card,
.results-card {
  width: 100%;
  max-width: 480px;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
}

.start-card h2,
.results-card h2 {
  margin-top: 0;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  margin-bottom: 1rem;
}

.field select {
  padding: 0.5rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--fg);
  font-size: 1rem;
}

.primary-btn {
  padding: 0.6rem 1.4rem;
  border-radius: 6px;
  border: none;
  background: var(--navy);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  font-size: 1rem;
}

.score-headline {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0.5rem 0;
}

.domain-breakdown {
  list-style: none;
  padding: 0;
  margin: 0 0 1.5rem;
}

.domain-breakdown li {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
}

/* ---------- Quiz header ---------- */

.quiz-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1.5rem;
  margin-bottom: 1rem;
}

.quiz-question-number {
  margin: 0;
  font-size: 1.4rem;
}

.quiz-progress {
  text-align: right;
  min-width: 200px;
}

.progress-bar {
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--border);
  margin-top: 0.3rem;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--navy);
  border-radius: 3px;
}

/* ---------- Case study / exhibits ---------- */

.case-study-block {
  margin-bottom: 1rem;
}

.case-study-block > button {
  width: 100%;
  text-align: left;
  padding: 0.6rem 0.8rem;
  border-radius: 6px;
  border: 1px solid var(--navy);
  background: color-mix(in srgb, var(--navy) 8%, transparent);
  color: var(--fg);
  cursor: pointer;
  font-weight: 600;
}

.scenario-body {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.8rem 1rem;
  margin-top: 0.5rem;
  max-height: 400px;
  overflow-y: auto;
}

.scenario-body h3 {
  margin-top: 1.2rem;
}

.scenario-body h4 {
  margin-top: 0.8rem;
  margin-bottom: 0.4rem;
}

.scenario-table {
  border-collapse: collapse;
  margin: 0.5rem 0 1rem;
  font-size: 0.9rem;
}

.scenario-table th,
.scenario-table td {
  border: 1px solid var(--border);
  padding: 0.3rem 0.6rem;
  text-align: left;
}

.exhibits {
  margin-bottom: 1rem;
}

.exhibit {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.4rem 0.7rem;
  margin-bottom: 0.4rem;
}

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

.question-text {
  font-size: 1.05rem;
}

/* ---------- Answer options (exam-style: no boxes, bold letter) ---------- */

.option-row {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  padding: 0.5rem 0;
  cursor: pointer;
}

.option-row.inline {
  display: inline-flex;
  align-items: center;
  padding: 0;
  margin-right: 1rem;
}

.option-row input[type="radio"],
.option-row input[type="checkbox"] {
  accent-color: var(--navy);
  margin-top: 0.2rem;
}

.option-letter {
  font-weight: 700;
}

.hotspot-row {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 0.6rem;
}

.hotspot-yesno {
  justify-content: space-between;
}

/* ---------- Actions & feedback ---------- */

.pill-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 1.3rem;
  border-radius: 999px;
  border: none;
  background: var(--pill-bg);
  color: var(--pill-fg);
  font-weight: 600;
  cursor: pointer;
  margin: 0.5rem 0;
}

.alert-banner {
  background: var(--alert-bg);
  border: 1px solid var(--alert-border);
  color: var(--alert-fg);
  border-radius: 6px;
  padding: 0.6rem 0.9rem;
  font-weight: 600;
}

.feedback-box {
  border-radius: 6px;
  padding: 0.8rem 1rem;
  margin-top: 1rem;
  border: 1px solid var(--border);
}

.feedback-box.correct {
  border-color: #2e7d32;
  background: color-mix(in srgb, #2e7d32 12%, transparent);
}

.feedback-box.incorrect {
  border-color: #c62828;
  background: color-mix(in srgb, #c62828 12%, transparent);
}

.discrepancy {
  font-weight: 600;
}

/* ---------- Bottom exam navbar ---------- */

.quiz-navbar {
  position: sticky;
  bottom: 0;
  display: flex;
  gap: 0.8rem;
  padding: 0.8rem 1.5rem;
  background: var(--navy-dark);
}

.navbar-btn {
  padding: 0.5rem 1.2rem;
  border-radius: 6px;
  border: none;
  background: var(--navy-light);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
}

.navbar-btn:disabled {
  opacity: 0.4;
  cursor: default;
}

.navbar-btn-exit {
  margin-left: auto;
}

/* ---------- Drag & drop (future) ---------- */

.drag-item {
  display: inline-block;
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--accent);
  border-radius: 4px;
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  cursor: grab;
  margin: 0.25rem;
}

.drop-target {
  display: inline-block;
  min-width: 140px;
  min-height: 2.2rem;
  border: 1px dashed var(--border);
  border-radius: 4px;
  margin: 0.25rem;
  padding: 0.4rem 0.6rem;
}