:root {
  --bg-deep: #12151a;
  --bg-mid: #1c222b;
  --ink: #f2efe8;
  --ink-muted: #a8b0bc;
  --accent: #e8a54b;
  --accent-hot: #f0c06a;
  --correct: #5ecf8a;
  --incorrect: #e86a5c;
  --line: rgba(242, 239, 232, 0.12);
  --option-bg: rgba(242, 239, 232, 0.04);
  --option-hover: rgba(232, 165, 75, 0.12);
  --font-display: "Syne", sans-serif;
  --font-body: "DM Sans", sans-serif;
  --radius: 12px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--bg-deep);
  line-height: 1.5;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  position: relative;
  overflow-x: hidden;
}

.atmosphere {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 80% 60% at 15% 10%, rgba(232, 165, 75, 0.18), transparent 55%),
    radial-gradient(ellipse 70% 50% at 90% 85%, rgba(90, 140, 180, 0.12), transparent 50%),
    linear-gradient(165deg, var(--bg-mid) 0%, var(--bg-deep) 55%, #0e1115 100%);
}

.atmosphere::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.35;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 180px;
  mix-blend-mode: overlay;
}

.shell {
  position: relative;
  z-index: 1;
  width: min(100%, 40rem);
}

.screen {
  display: none;
  flex-direction: column;
  align-items: flex-start;
  gap: 1.25rem;
  animation: rise-in 0.55s var(--ease) both;
}

.screen--active {
  display: flex;
}

.brand {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.75rem, 8vw, 4.25rem);
  line-height: 0.95;
  letter-spacing: -0.03em;
  color: var(--ink);
  animation: brand-in 0.7s var(--ease) both;
}

.brand--sm {
  font-size: clamp(1.5rem, 4vw, 2rem);
}

.quiz-title {
  margin: 0;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 1.125rem;
  color: var(--accent);
  letter-spacing: 0.02em;
}

.lede {
  margin: 0;
  max-width: 28rem;
  color: var(--ink-muted);
  font-size: 1.05rem;
}

.progress {
  margin: 0;
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
}

.question {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.35rem, 3.5vw, 1.75rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.options {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  width: 100%;
}

.option {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  width: 100%;
  text-align: left;
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--option-bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.4;
  cursor: pointer;
  transition:
    background 0.2s var(--ease),
    border-color 0.2s var(--ease),
    transform 0.15s var(--ease);
}

.option:hover:not(:disabled) {
  background: var(--option-hover);
  border-color: rgba(232, 165, 75, 0.45);
}

.option:active:not(:disabled) {
  transform: scale(0.985);
}

.option:disabled {
  cursor: default;
}

.option__id {
  flex-shrink: 0;
  font-weight: 700;
  color: var(--accent);
  min-width: 1.25rem;
}

.option--correct {
  border-color: var(--correct);
  background: rgba(94, 207, 138, 0.12);
}

.option--correct .option__id {
  color: var(--correct);
}

.option--wrong {
  border-color: var(--incorrect);
  background: rgba(232, 106, 92, 0.12);
}

.option--wrong .option__id {
  color: var(--incorrect);
}

.option--dim {
  opacity: 0.45;
}

.feedback {
  margin: 0;
  font-weight: 700;
  font-size: 1.05rem;
  animation: feedback-in 0.35s var(--ease) both;
}

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

.feedback--incorrect {
  color: var(--incorrect);
}

.btn {
  appearance: none;
  border: none;
  border-radius: 999px;
  padding: 0.85rem 1.6rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition:
    background 0.2s var(--ease),
    transform 0.15s var(--ease),
    box-shadow 0.2s var(--ease);
}

.btn--primary {
  background: var(--accent);
  color: #1a140c;
  box-shadow: 0 8px 28px rgba(232, 165, 75, 0.28);
}

.btn--primary:hover {
  background: var(--accent-hot);
  transform: translateY(-1px);
}

.btn--primary:active {
  transform: translateY(0);
}

.results-heading {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 4vw, 2rem);
}

.score {
  margin: 0;
  font-size: 1.25rem;
  color: var(--ink-muted);
}

.tier {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 5vw, 2.25rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--accent);
  animation: feedback-in 0.5s var(--ease) 0.1s both;
}

.error {
  margin: 0;
  color: var(--incorrect);
  font-size: 0.95rem;
}

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes brand-in {
  from {
    opacity: 0;
    transform: translateY(18px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes feedback-in {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 480px) {
  body {
    padding: 1.25rem;
    align-items: flex-start;
    padding-top: 2.5rem;
  }

  .option {
    padding: 0.8rem 0.9rem;
  }
}