.multi-trainer-app .app-container {
  justify-content: flex-start;
}

.trainer-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.45rem;
  padding: 0.28rem;
  border: 1px solid var(--border-subtle);
  border-radius: 0.75rem;
  background: rgba(8, 15, 28, 0.88);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.28);
}

.trainer-nav-btn {
  min-height: 2.2rem;
  border: 1px solid transparent;
  border-radius: 0.55rem;
  background: transparent;
  color: var(--text-secondary);
  font: 600 0.78rem var(--font-ui);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: var(--transition-fast);
}

.trainer-nav-btn:hover {
  color: var(--text-primary);
  background: rgba(56, 189, 248, 0.08);
}

.trainer-nav-btn.active {
  color: var(--sky-accent);
  border-color: rgba(56, 189, 248, 0.32);
  background: rgba(14, 165, 233, 0.12);
  box-shadow: inset 0 0 14px rgba(56, 189, 248, 0.07);
}

.trainer-nav-icon {
  font: 700 0.95rem var(--font-hud);
}

.trainer-view {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 0.45rem;
}

.trainer-view.hidden {
  display: none !important;
}

.rotation-workspace {
  flex: 1;
  min-height: 0;
  display: grid;
  align-items: start;
  grid-template-columns: minmax(0, 1fr) 14rem;
  gap: 0.65rem;
}

.rotation-card {
  border: 1px solid var(--border-subtle);
  border-radius: 0.85rem;
  background: var(--bg-card);
  box-shadow: var(--shadow-card);
}

.rotation-question-card {
  min-width: 0;
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  gap: 0.55rem;
  overflow-y: auto;
}

.rotation-flow {
  display: grid;
  grid-template-columns: minmax(9rem, 0.8fr) minmax(18rem, 1.5fr) minmax(9rem, 0.8fr);
  gap: 0.55rem;
}

.rotation-orientation-box,
.rotation-sequence-box {
  min-width: 0;
  padding: 0.65rem;
  border: 1px solid var(--border-subtle);
  border-radius: 0.7rem;
  background: rgba(9, 13, 22, 0.58);
}

.rotation-sequence-box {
  display: flex;
  flex-direction: column;
}

.rotation-eyebrow {
  margin-bottom: 0.45rem;
  color: var(--text-muted);
  font: 700 0.62rem var(--font-hud);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.rotation-aircraft-stage {
  height: clamp(7.2rem, 18vh, 10.5rem);
  position: relative;
  overflow: hidden;
  display: grid;
  place-items: center;
  border-radius: 0.55rem;
  background-image:
    linear-gradient(rgba(148, 163, 184, 0.12) 1px, transparent 1px),
    linear-gradient(90deg, rgba(148, 163, 184, 0.12) 1px, transparent 1px),
    radial-gradient(circle, rgba(56, 189, 248, 0.08), transparent 68%);
  background-size: 1.5rem 1.5rem, 1.5rem 1.5rem, auto;
}

.rotation-aircraft-stage::before,
.rotation-aircraft-stage::after {
  content: '';
  position: absolute;
  background: rgba(148, 163, 184, 0.28);
}

.rotation-aircraft-stage::before { width: 1px; height: 100%; left: 50%; }
.rotation-aircraft-stage::after { height: 1px; width: 100%; top: 50%; }

.rotation-plane {
  width: clamp(3.2rem, 7vh, 4.6rem);
  height: clamp(3.2rem, 7vh, 4.6rem);
  z-index: 1;
  color: var(--sky-accent);
  transform-origin: 50% 50%;
  filter: drop-shadow(0 0 10px var(--sky-glow));
  transition: transform var(--transition-normal);
}

.rotation-heading-label {
  min-height: 1rem;
  margin-top: 0.35rem;
  color: var(--text-secondary);
  text-align: center;
  font: 600 0.7rem var(--font-ui);
}

.rotation-sequence {
  flex: 1;
  min-height: 7.2rem;
  max-height: 12rem;
  overflow-y: auto;
  display: flex;
  flex-wrap: wrap;
  align-content: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.2rem;
}

.rotation-step {
  min-width: 4.25rem;
  padding: 0.6rem 0.45rem;
  border: 1px solid rgba(148, 163, 184, 0.26);
  border-radius: 0.55rem;
  background: rgba(30, 41, 59, 0.72);
  color: var(--text-primary);
  text-align: center;
  font: 700 0.9rem var(--font-mono);
}

.rotation-step.missing {
  border: 1px dashed var(--sky-accent);
  color: var(--sky-accent);
  background: rgba(14, 165, 233, 0.1);
}

.rotation-prompt {
  color: var(--text-primary);
  text-align: center;
  font: 700 1rem var(--font-ui);
}

.rotation-help {
  color: var(--text-muted);
  text-align: center;
  font-size: 0.7rem;
}

.rotation-answers {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(4.6rem, 1fr));
  gap: 0.4rem;
}

.rotation-answers[data-choices="5"] {
  grid-template-columns: repeat(5, minmax(4.6rem, 1fr));
}

.rotation-answers[data-choices="6"] {
  grid-template-columns: repeat(6, minmax(4.6rem, 1fr));
}

.rotation-answers[data-choices="7"] {
  grid-template-columns: repeat(7, minmax(4.6rem, 1fr));
}

.rotation-answers[data-choices="8"] {
  grid-template-columns: repeat(4, minmax(4.6rem, 1fr));
}

.rotation-answer {
  min-height: 3rem;
  position: relative;
  border: 1px solid rgba(148, 163, 184, 0.28);
  border-radius: 0.55rem;
  background: rgba(15, 23, 42, 0.84);
  color: var(--text-primary);
  font: 700 0.83rem var(--font-mono);
  cursor: pointer;
  transition: var(--transition-fast);
}

.rotation-answer:hover:not(:disabled),
.rotation-answer:focus-visible {
  border-color: var(--sky-accent);
  transform: translateY(-1px);
}

.rotation-answer:disabled { cursor: default; }
.rotation-answer.correct { border-color: var(--emerald-success); background: rgba(16, 185, 129, 0.14); color: #6ee7b7; }
.rotation-answer.wrong { border-color: var(--rose-danger); background: rgba(244, 63, 94, 0.14); color: #fda4af; }

.rotation-choice-key {
  position: absolute;
  top: 0.2rem;
  left: 0.3rem;
  color: var(--text-muted);
  font-size: 0.55rem;
}

.rotation-footer {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.65rem;
  padding-top: 0.5rem;
  border-top: 1px solid var(--border-subtle);
}

.rotation-feedback {
  min-height: 1.2rem;
  color: var(--text-secondary);
  font-size: 0.72rem;
  line-height: 1.4;
}

.rotation-feedback.correct { color: #6ee7b7; }
.rotation-feedback.wrong { color: #fda4af; }
.rotation-feedback.solution { color: var(--sky-accent); }

.rotation-controls {
  flex: 0 0 auto;
  display: flex;
  gap: 0.4rem;
}

.rotation-settings {
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  align-items: stretch;
}

.rotation-settings .switch-control {
  align-items: center;
}

.rotation-rule {
  color: var(--text-muted);
  font-size: 0.68rem;
  line-height: 1.5;
}

.rotation-rule strong { color: var(--text-secondary); }

@media (max-width: 900px), (max-height: 600px) {
  .rotation-workspace { grid-template-columns: 1fr; overflow-y: auto; }
  .rotation-settings { flex-direction: row; flex-wrap: wrap; align-items: center; }
  .rotation-settings .control-item { min-width: 10rem; }
  .rotation-settings .rotation-rule { flex: 1 1 18rem; }
}

@media (max-width: 720px) {
  .rotation-flow { grid-template-columns: 1fr 1fr; }
  .rotation-sequence-box { grid-column: 1 / -1; grid-row: 2; }
  .rotation-answers { grid-template-columns: repeat(4, minmax(4.5rem, 1fr)); }
  .rotation-footer { align-items: stretch; flex-direction: column; }
  .rotation-controls { justify-content: flex-end; }
}

@media (max-width: 480px) {
  .trainer-nav-btn { font-size: 0.68rem; }
  .rotation-question-card { padding: 0.55rem; }
  .rotation-flow { gap: 0.35rem; }
  .rotation-orientation-box, .rotation-sequence-box { padding: 0.45rem; }
  .rotation-aircraft-stage { height: 6.8rem; }
  .rotation-answers { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .rotation-controls { display: grid; grid-template-columns: 1fr 1fr; }
}