:root {
  color-scheme: light;
  --bg: #f6f7f9;
  --panel: #ffffff;
  --ink: #16202a;
  --muted: #65727f;
  --line: #d8dee6;
  --accent: #0c6b5e;
  --accent-ink: #ffffff;
  --warn: #b4482d;
  --ok: #16734f;
  --focus: #e7f2ef;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
  background: var(--bg);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input {
  font: inherit;
}

.app-shell {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  min-height: 100vh;
}

.sidebar {
  border-right: 1px solid var(--line);
  background: var(--panel);
  padding: 24px;
  overflow: auto;
}

.brand {
  display: flex;
  gap: 14px;
  align-items: center;
  margin-bottom: 24px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  border-radius: 8px;
  background: var(--ink);
  color: #fff;
  font-weight: 800;
}

h1,
h2,
h3,
p {
  margin: 0;
}

h1 {
  font-size: 24px;
}

.brand p,
.eyebrow,
.source,
.status-grid span,
.field span {
  color: var(--muted);
}

.panel {
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.panel h2 {
  margin-bottom: 12px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0;
}

.segmented {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}

.segmented button,
.toolbar button,
.actions button {
  border: 0;
  cursor: pointer;
}

.segmented button {
  min-height: 40px;
  background: #fff;
  color: var(--ink);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.segmented button:nth-child(2n) {
  border-right: 0;
}

.segmented button:nth-last-child(-n + 2) {
  border-bottom: 0;
}

.segmented button.active {
  background: var(--accent);
  color: var(--accent-ink);
}

.filter-list {
  display: grid;
  gap: 8px;
}

.aircraft-toggle {
  display: grid;
  gap: 8px;
}

.aircraft-option {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  align-items: center;
  min-height: 52px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  padding: 10px 12px;
  text-align: left;
  cursor: pointer;
}

.aircraft-option span {
  color: var(--muted);
  font-size: 13px;
}

.aircraft-option.active {
  border-color: var(--accent);
  background: var(--focus);
  box-shadow: inset 4px 0 0 var(--accent);
}

.aircraft-option.active strong {
  color: var(--accent);
}

.stat-list {
  display: grid;
  gap: 8px;
}

.stat-list div {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

.stat-list span,
.exam-plan span {
  color: var(--muted);
}

.exam-plan {
  display: grid;
  gap: 8px;
  font-size: 13px;
}

.exam-plan div {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  align-items: start;
}

.exam-plan strong {
  white-space: nowrap;
}

.exam-plan-total {
  border-top: 1px solid var(--line);
  margin-top: 4px;
  padding-top: 8px;
}

.about-panel p {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.45;
  margin-bottom: 10px;
}

.about-panel p:last-child {
  margin-bottom: 0;
}

.plain-btn {
  width: 100%;
  min-height: 38px;
  margin-top: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  cursor: pointer;
}

.check-row,
.field {
  display: flex;
  align-items: center;
  gap: 10px;
}

.check-row {
  min-height: 32px;
}

.field {
  justify-content: space-between;
  margin-bottom: 12px;
}

.field input {
  width: 88px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 8px;
}

.workspace {
  display: grid;
  grid-template-rows: auto 1fr;
  min-width: 0;
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: center;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.88);
  padding: 22px 28px;
}

.topbar h2 {
  margin-top: 4px;
  font-size: 26px;
}

.toolbar {
  display: flex;
  gap: 8px;
}

.toolbar button {
  width: 42px;
  height: 42px;
  border-radius: 8px;
  background: var(--panel);
  border: 1px solid var(--line);
  color: var(--ink);
  font-size: 24px;
}

.question-area {
  width: min(1120px, 100%);
  padding: 28px;
}

.status-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 18px;
}

.status-grid div {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  padding: 14px;
}

.status-grid span {
  display: block;
  margin-bottom: 6px;
  font-size: 13px;
}

.status-grid strong {
  font-size: 22px;
}

.section-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  margin-bottom: 12px;
}

.section-head span {
  color: var(--muted);
  font-size: 13px;
}

.subject-progress,
.result-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  margin-bottom: 18px;
  padding: 14px;
}

.subject-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 10px;
}

.subject-card {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  background: #fff;
}

.subject-card span {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 13px;
}

.subject-card b {
  white-space: nowrap;
  font-size: 20px;
}

.question-nav {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  margin-bottom: 18px;
  padding: 14px;
}

.question-nav-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  margin-bottom: 12px;
}

.question-nav-head span {
  color: var(--muted);
  font-size: 13px;
}

.question-navigator {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(36px, 1fr));
  gap: 6px;
  max-height: 168px;
  overflow: auto;
}

.question-dot {
  min-width: 0;
  height: 34px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
}

.question-dot.active {
  outline: 2px solid var(--ink);
  outline-offset: 1px;
}

.question-dot.correct {
  border-color: var(--ok);
  background: #dff3e9;
  color: #0f5f40;
}

.question-dot.wrong {
  border-color: var(--warn);
  background: #ffe3da;
  color: #8e301d;
}

.question-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  padding: 28px;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 14px;
}

.result-grid div {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px;
  background: #fff;
}

.result-grid span {
  display: block;
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 5px;
}

.result-grid strong {
  font-size: 22px;
}

.result-subjects {
  display: grid;
  gap: 8px;
}

.result-subjects div {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  border-top: 1px solid var(--line);
  padding-top: 8px;
}

.source {
  margin-bottom: 12px;
  font-size: 13px;
}

.question-card h3 {
  margin-bottom: 24px;
  font-size: 24px;
  line-height: 1.35;
}

.question-image {
  margin: 0 0 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  overflow: hidden;
}

.question-image img {
  display: block;
  width: 100%;
  max-height: 560px;
  object-fit: contain;
  background: #fff;
}

.question-image figcaption {
  border-top: 1px solid var(--line);
  padding: 9px 12px;
  color: var(--muted);
  font-size: 13px;
}

.answers {
  display: grid;
  gap: 10px;
}

.answer {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 12px;
  align-items: start;
  width: 100%;
  min-height: 56px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  padding: 14px;
  color: var(--ink);
  text-align: left;
  cursor: pointer;
}

.answer:hover {
  background: var(--focus);
}

.answer .letter {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: #edf1f5;
  font-weight: 700;
}

.answer.correct {
  border-color: var(--ok);
  background: #edf8f2;
}

.answer.wrong {
  border-color: var(--warn);
  background: #fff1ec;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
  margin-top: 22px;
}

.actions button {
  min-height: 42px;
  border-radius: 8px;
  padding: 0 16px;
  background: var(--ink);
  color: #fff;
}

.actions button.secondary-action,
#showAnswerBtn {
  background: #fff;
  border: 1px solid var(--line);
  color: var(--ink);
}

.actions button.finish-action {
  background: var(--accent);
}

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

@media (max-width: 820px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .topbar,
  .question-area {
    padding: 18px;
  }

  .status-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .question-card {
    padding: 20px;
  }

  .result-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  body {
    background: #fff;
  }

  .sidebar {
    padding: 16px;
  }

  .brand {
    margin-bottom: 16px;
  }

  .panel {
    padding: 14px 0;
  }

  .topbar {
    align-items: flex-start;
  }

  .topbar h2 {
    font-size: 21px;
  }

  .toolbar {
    display: none;
  }

  .question-area {
    padding: 14px;
  }

  .status-grid {
    gap: 8px;
  }

  .status-grid div,
  .subject-progress,
  .question-nav,
  .question-card,
  .result-panel {
    border-radius: 8px;
  }

  .status-grid strong {
    font-size: 20px;
  }

  .question-navigator {
    grid-template-columns: repeat(auto-fill, minmax(34px, 1fr));
    max-height: 132px;
  }

  .question-card h3 {
    font-size: 21px;
  }

  .answer {
    min-height: 62px;
    padding: 14px 12px;
  }

  .actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .actions button {
    width: 100%;
  }
}

/* Explanation displayed after answering in practice mode. */
.answer-explanation {
  margin-top: 18px;
  padding: 18px 20px;
  border: 1px solid #a8d4c4;
  border-left: 5px solid #16715d;
  border-radius: 10px;
  background: #eff8f4;
  color: var(--ink);
  line-height: 1.6;
}
.answer-explanation[hidden] { display: none; }
.answer-explanation strong { display: block; margin-bottom: 8px; color: #116451; }
.answer-explanation p { margin: 0; }


/* Training modules displayed directly under the PPL aircraft type selector. */
.training-module-links{display:grid;gap:8px;margin-top:8px}
.training-module-link{width:100%;text-decoration:none}
.training-module-link:visited{color:var(--ink)}
.training-module-link:hover,.training-module-link:focus-visible{border-color:var(--accent);background:var(--focus);outline:2px solid transparent}
.training-module-link strong{font-size:inherit}