:root {
  --bg: #f2f7f4;
  --ink: #16221f;
  --muted: #5d6d68;
  --panel: #fffdf7;
  --line: #dce8e1;
  --green: #167a58;
  --blue: #2468b2;
  --yellow: #f6c84c;
  --coral: #e2674f;
  --shadow: 0 22px 70px rgba(30, 54, 47, .16);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 8% 18%, rgba(246, 200, 76, .34), transparent 24%),
    radial-gradient(circle at 92% 12%, rgba(36, 104, 178, .18), transparent 28%),
    linear-gradient(135deg, #f8fbff 0%, var(--bg) 42%, #fff3e9 100%);
}

button { font: inherit; }

.app {
  width: min(1040px, calc(100% - 28px));
  min-height: 100vh;
  margin: 0 auto;
  display: grid;
  place-items: center;
  padding: 28px 0;
}

.quiz-shell {
  width: 100%;
  background: rgba(255, 253, 247, .94);
  border: 1px solid rgba(22, 34, 31, .08);
  border-radius: 8px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: clamp(22px, 4vw, 42px);
  background:
    linear-gradient(90deg, rgba(22, 122, 88, .12), rgba(36, 104, 178, .10)),
    var(--panel);
}

.eyebrow {
  margin: 0 0 8px;
  font-size: .78rem;
  font-weight: 900;
  letter-spacing: .12em;
  color: var(--coral);
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 4.6rem);
  line-height: .96;
  letter-spacing: 0;
}

.score-panel {
  min-width: 108px;
  aspect-ratio: 1;
  border-radius: 8px;
  display: grid;
  place-items: center;
  align-content: center;
  background: var(--ink);
  color: white;
  border: 4px solid var(--yellow);
}

.score-panel span {
  font-size: clamp(2rem, 5vw, 3.4rem);
  font-weight: 950;
  line-height: .9;
}

.score-panel small {
  margin-top: 5px;
  color: #dbe8e3;
  font-weight: 800;
}

.progress-track {
  height: 12px;
  background: #e7eee9;
}

.progress-bar {
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--green), var(--blue), var(--yellow));
  transition: width .22s ease;
}

.question-card {
  padding: clamp(22px, 5vw, 52px);
}

.category-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 22px;
}

.category,
.difficulty {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 7px 10px;
  border-radius: 8px;
  font-weight: 900;
  font-size: .88rem;
}

.category {
  color: #0d5b41;
  background: rgba(22, 122, 88, .12);
}

.difficulty {
  color: #7a4215;
  background: rgba(246, 200, 76, .28);
}

h2 {
  min-height: 2.6em;
  margin: 0 0 26px;
  font-size: clamp(1.55rem, 3.3vw, 2.8rem);
  line-height: 1.12;
  letter-spacing: 0;
}

.options {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.option {
  min-height: 72px;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px;
  text-align: left;
  background: white;
  border: 2px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  cursor: pointer;
  transition: border-color .16s ease, background .16s ease, transform .16s ease;
}

.option:hover { transform: translateY(-1px); }

.option strong {
  flex: 0 0 34px;
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: #eef5f1;
  color: var(--green);
}

.option.correct {
  border-color: var(--green);
  background: #edf8f2;
}

.option.correct strong {
  background: var(--green);
  color: white;
}

.option.selected {
  border-color: var(--blue);
  background: #edf4ff;
  box-shadow: inset 0 0 0 2px rgba(36, 104, 178, .12);
}

.option.selected strong {
  background: var(--blue);
  color: white;
}

.option.incorrect {
  border-color: var(--coral);
  background: #fff0ec;
}

.option.incorrect strong {
  background: var(--coral);
  color: white;
}

.answer-panel {
  margin-top: 24px;
  padding: 18px;
  border-left: 6px solid var(--green);
  background: #eff8f3;
  border-radius: 8px;
  animation: panelPop .26s ease both;
}

.answer-panel.is-correct {
  border-left-color: var(--green);
  background: #ecf9f1;
}

.answer-panel.is-incorrect {
  border-left-color: var(--coral);
  background: #fff0ec;
}

.answer-panel.neutral {
  border-left-color: var(--blue);
  background: #eef5ff;
}

.answer-panel p { margin: 0; }
.answer-label {
  margin-bottom: 6px;
  font-size: .78rem;
  font-weight: 950;
  letter-spacing: .12em;
  color: var(--green);
  text-transform: uppercase;
}

#answerText {
  font-size: 1.25rem;
  font-weight: 900;
}

.fact {
  margin-top: 8px !important;
  color: var(--muted);
  line-height: 1.45;
}

.controls {
  display: grid;
  grid-template-columns: 1fr 1.4fr 1fr;
  gap: 12px;
  padding: 18px clamp(22px, 5vw, 52px) clamp(22px, 4vw, 38px);
  border-top: 1px solid var(--line);
  background: #fbf7ec;
}

.button {
  min-height: 52px;
  border: 0;
  border-radius: 8px;
  padding: 13px 16px;
  font-weight: 950;
  color: white;
  cursor: pointer;
}

.button:disabled {
  opacity: .42;
  cursor: not-allowed;
}

.primary { background: var(--blue); }
.secondary { background: #60716c; }
.reveal { background: var(--coral); }

.feedback-burst {
  pointer-events: none;
  position: fixed;
  left: 50%;
  top: 30%;
  z-index: 10;
  transform: translate(-50%, -50%);
  min-width: 180px;
  min-height: 70px;
  display: grid;
  place-items: center;
  color: var(--ink);
  font-weight: 950;
}

.feedback-burst span {
  position: absolute;
  padding: 9px 12px;
  border-radius: 8px;
  background: var(--yellow);
  box-shadow: 0 12px 32px rgba(22, 34, 31, .18);
  animation: confettiWord 1s ease var(--delay) both;
}

.feedback-burst.thinking,
.feedback-burst.consider {
  padding: 14px 18px;
  border-radius: 8px;
  background: white;
  box-shadow: 0 16px 42px rgba(22, 34, 31, .18);
  animation: thoughtBubble 1.1s ease both;
}

.feedback-burst.consider {
  color: #813c28;
  background: #fff0ec;
}

@keyframes panelPop {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes confettiWord {
  0% { opacity: 0; transform: translate(0, 8px) scale(.82) rotate(-8deg); }
  18% { opacity: 1; transform: translate(var(--x), -24px) scale(1.05) rotate(5deg); }
  78% { opacity: 1; transform: translate(var(--x), -58px) scale(1) rotate(-3deg); }
  100% { opacity: 0; transform: translate(var(--x), -74px) scale(.92) rotate(6deg); }
}

@keyframes thoughtBubble {
  0% { opacity: 0; transform: translate(-50%, -42%) scale(.9); }
  20%, 80% { opacity: 1; transform: translate(-50%, -50%) scale(1); }
  100% { opacity: 0; transform: translate(-50%, -58%) scale(.96); }
}

@media (max-width: 720px) {
  .topbar { align-items: flex-start; }
  .score-panel { min-width: 84px; }
  .options,
  .controls {
    grid-template-columns: 1fr;
  }
  h2 { min-height: auto; }
}