:root {
  --bg: #050716;
  --bg-gradient: radial-gradient(circle at top, #c05621 0, #050716 45%, #000 100%);
  --card-bg: rgba(12, 13, 35, 0.97);
  --accent: #f6ad55;
  --accent2: #fbd38d;
  --border: #262b45;
  --text: #f6f7ff;
  --muted: #aab1d8;
  --correct: #38a169;
  --wrong: #e53e3e;
  --shadow: 0 18px 40px rgba(0, 0, 0, 0.65);
  --radius-lg: 18px;
}

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

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg-gradient);
  min-height: 100vh;
  padding: 20px 12px 28px;
  color: var(--text);
  display: flex;
  justify-content: center;
}

.app {
  width: 100%;
  max-width: 1150px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: 14px 16px;
}

.app-header {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.header-main {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-wrap {
  flex-shrink: 0;
}

.logo-img {
  width: 64px;
  height: 64px;
  object-fit: contain;
  filter: drop-shadow(0 0 16px rgba(0, 0, 0, 0.9));
}

.title-block h1 {
  margin: 0 0 4px;
  font-size: 2rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.title-block h1 span {
  color: var(--accent2);
}

.subtitle {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.header-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  margin-top: 4px;
}

.field {
  display: flex;
  align-items: center;
  gap: 6px;
}

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

.field select {
  background: #050814;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 6px 10px;
  font-size: 0.9rem;
}

.field select:focus {
  outline: 1px solid var(--accent);
  box-shadow: 0 0 0 1px rgba(246, 173, 85, 0.6);
}

.btn {
  border-radius: 999px;
  border: 1px solid transparent;
  padding: 7px 16px;
  font-size: 0.9rem;
  cursor: pointer;
  background: #151a33;
  color: var(--text);
  transition:
    background 0.16s ease,
    transform 0.12s ease,
    box-shadow 0.18s ease;
}

.btn.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #050814;
  font-weight: 600;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.75);
}

.btn.secondary {
  border-color: var(--border);
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.7);
}

.btn:active {
  transform: translateY(0);
  box-shadow: 0 7px 16px rgba(0, 0, 0, 0.55);
}

.btn:disabled {
  opacity: 0.5;
  cursor: default;
  box-shadow: none;
}

.main-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 14px;
}

@media (max-width: 900px) {
  .main-layout {
    grid-template-columns: minmax(0, 1fr);
  }
}

.question-panel {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.hud {
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
  color: var(--muted);
}

.hud span {
  font-weight: 600;
  color: var(--text);
}

#questionHeading {
  margin: 0;
  font-size: 1.05rem;
}

.scenario-text {
  font-size: 0.95rem;
  white-space: pre-wrap;
}

.question-text {
  margin-top: 4px;
  font-size: 0.9rem;
}

.answers {
  margin-top: 6px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
}

.answer-btn {
  border-radius: 999px;
  border: 1px solid #283354;
  background: #050815;
  padding: 8px 11px;
  text-align: left;
  font-size: 0.9rem;
  color: var(--text);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition:
    border-color 0.16s ease,
    background 0.16s ease,
    transform 0.08s ease,
    box-shadow 0.16s ease;
}

.answer-btn::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(246, 173, 85, 0.32), rgba(251, 211, 141, 0.32));
  opacity: 0;
  mix-blend-mode: screen;
  transition: opacity 0.18s ease;
}

.answer-btn:hover {
  border-color: var(--accent);
  background: #0c1125;
  box-shadow: 0 0 14px rgba(246, 173, 85, 0.4);
}

.answer-btn:hover::before {
  opacity: 0.28;
}

.answer-btn.correct {
  background: #0f3a21;
  border-color: #48bb78;
  box-shadow: 0 0 16px rgba(72, 187, 120, 0.8);
}

.answer-btn.wrong {
  background: #3a0714;
  border-color: var(--wrong);
  box-shadow: 0 0 16px rgba(229, 62, 62, 0.7);
}

.answer-btn:disabled {
  opacity: 0.85;
  cursor: default;
}

.answer-btn:active:not(:disabled) {
  transform: scale(0.98);
}

.controls-row {
  display: flex;
  justify-content: flex-end;
  margin-top: 6px;
}

.feedback {
  min-height: 22px;
  font-size: 0.85rem;
  margin-top: 4px;
  color: var(--muted);
}

.feedback.good {
  color: var(--correct);
}

.feedback.bad {
  color: var(--wrong);
}

.explanation {
  margin-top: 6px;
  padding: 8px 10px;
  border-radius: 10px;
  border: 1px dashed #394165;
  background: rgba(5, 9, 30, 0.9);
  font-size: 0.85rem;
  color: var(--muted);
}

.help-panel {
  border-left: 1px solid #1f2741;
  padding-left: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.help-panel h2 {
  margin: 0 0 4px;
  font-size: 1.05rem;
}

.ref-list {
  margin: 0;
  padding-left: 18px;
  font-size: 0.85rem;
  color: var(--muted);
}

.ref-list li + li {
  margin-top: 4px;
}

.footer-card .hint {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
}

.hidden {
  display: none !important;
}