:root {
  --bg: #eff6ff;
  --bg-2: #f8fafc;
  --surface: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --line: #dbeafe;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --fact: #059669;
  --fact-dark: #047857;
  --opinion: #d97706;
  --opinion-dark: #b45309;
  --danger: #dc2626;
  --radius-xl: 28px;
  --radius-lg: 20px;
  --shadow: 0 24px 70px rgba(15, 23, 42, 0.16);
  --shadow-soft: 0 12px 30px rgba(15, 23, 42, 0.10);
  --focus: #facc15;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
}

body {
  min-height: 100vh;
  margin: 0;
  display: grid;
  place-items: center;
  padding: 20px;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(59, 130, 246, 0.22), transparent 34rem),
    linear-gradient(135deg, var(--bg), var(--bg-2));
  line-height: 1.5;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible,
a:focus-visible {
  outline: 4px solid var(--focus);
  outline-offset: 4px;
}

.app-shell {
  width: min(100%, 760px);
  min-height: clamp(640px, 74vh, 700px);
  display: grid;
  align-items: stretch;
  padding: clamp(22px, 4vw, 46px);
  border: 1px solid rgba(37, 99, 235, 0.12);
  border-radius: var(--radius-xl);
  background: rgba(255, 255, 255, 0.94);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.screen {
  width: 100%;
  display: none;
  animation: showScreen 240ms ease-out both;
}

.screen--active {
  min-height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

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

h1,
h2,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 18px;
  font-size: clamp(2.35rem, 7vw, 4.7rem);
  line-height: 0.95;
  letter-spacing: -0.05em;
  color: #1e3a8a;
}

#end-title,
#feedback-title {
  margin-bottom: 20px;
  font-size: clamp(2rem, 5vw, 3rem);
  line-height: 1.05;
  text-align: center;
}

.eyebrow {
  margin-bottom: 12px;
  color: var(--primary);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.lead {
  max-width: 620px;
  margin-inline: auto;
  margin-bottom: 28px;
  color: #475569;
  font-size: clamp(1.05rem, 2.2vw, 1.25rem);
  text-align: center;
}

.rules {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin: 0 auto 28px;
}

.rule-card {
  padding: 20px;
  border: 2px solid transparent;
  border-radius: var(--radius-lg);
  background: #f8fafc;
  text-align: left;
}

.rule-card h2 {
  margin-bottom: 8px;
  font-size: 1.3rem;
}

.rule-card p {
  margin: 0;
  color: #475569;
}

.rule-card--fact {
  border-color: rgba(5, 150, 105, 0.24);
  background: #ecfdf5;
}

.rule-card--fact h2 {
  color: var(--fact-dark);
}

.rule-card--opinion {
  border-color: rgba(217, 119, 6, 0.24);
  background: #fffbeb;
}

.rule-card--opinion h2 {
  color: var(--opinion-dark);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 58px;
  border: 0;
  border-radius: 18px;
  padding: 16px 24px;
  color: #ffffff;
  font: inherit;
  font-size: clamp(1.05rem, 2vw, 1.2rem);
  font-weight: 800;
  cursor: pointer;
  box-shadow: var(--shadow-soft);
  transition: transform 160ms ease, box-shadow 160ms ease, background-color 160ms ease;
}

.btn:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 18px 38px rgba(15, 23, 42, 0.15);
}

.btn:active:not(:disabled) {
  transform: translateY(0);
}

.btn:disabled {
  cursor: wait;
  opacity: 0.65;
}

.btn--wide {
  min-width: min(100%, 260px);
  align-self: center;
  margin-inline: auto;
}

.btn--primary {
  background: var(--primary);
}

.btn--primary:hover:not(:disabled) {
  background: var(--primary-dark);
}

.btn--fact {
  background: var(--fact);
}

.btn--fact:hover:not(:disabled) {
  background: var(--fact-dark);
}

.btn--opinion {
  background: var(--opinion);
}

.btn--opinion:hover:not(:disabled) {
  background: var(--opinion-dark);
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
  color: #475569;
  font-weight: 800;
}

.progress-track {
  width: 100%;
  height: 12px;
  margin-bottom: 26px;
  border-radius: 999px;
  background: #dbeafe;
  overflow: hidden;
}

.progress-fill {
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--primary), #60a5fa);
  transition: width 260ms ease;
}

.statement-card {
  min-height: 250px;
  display: grid;
  align-content: center;
  margin-bottom: 24px;
  padding: clamp(24px, 5vw, 42px);
  border: 2px solid var(--line);
  border-radius: var(--radius-xl);
  background: linear-gradient(180deg, #ffffff, #f8fbff);
  text-align: center;
}

.statement-label,
.feedback-type {
  margin-bottom: 12px;
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

#statement-text {
  margin: 0;
  font-size: clamp(1.7rem, 4.2vw, 2.6rem);
  line-height: 1.16;
}

.statement-card.is-changing #statement-text {
  animation: statementIn 220ms ease-out both;
}

@keyframes statementIn {
  from {
    opacity: 0;
    transform: scale(0.98);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.answers {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.feedback-mark {
  width: 86px;
  height: 86px;
  display: grid;
  place-items: center;
  margin: 0 auto 18px;
  border-radius: 999px;
  color: #ffffff;
  font-size: 3rem;
  font-weight: 900;
}

.feedback-mark--correct {
  background: var(--fact);
}

.feedback-mark--wrong {
  background: var(--danger);
}

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

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

.feedback-card,
.result-card {
  width: 100%;
  margin-bottom: 28px;
  padding: clamp(22px, 4vw, 32px);
  border: 2px solid var(--line);
  border-radius: var(--radius-lg);
  background: #f8fafc;
}

.feedback-card blockquote {
  margin: 0 0 18px;
  padding: 0 0 18px;
  border-bottom: 1px solid #dbeafe;
  color: #334155;
  font-size: clamp(1.1rem, 2.8vw, 1.35rem);
  font-weight: 800;
}

#feedback-explanation {
  margin-bottom: 0;
  color: #1e293b;
  font-size: 1.05rem;
}

.source {
  min-height: 1.4em;
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.source:empty {
  display: none;
}

.source a {
  color: var(--primary-dark);
  font-weight: 800;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.result-card {
  width: min(100%, 360px);
  margin-inline: auto;
  text-align: center;
  background: #eff6ff;
}

.result-card p {
  margin-bottom: 10px;
  color: #475569;
  font-weight: 800;
}

.result-card strong {
  display: block;
  color: var(--primary);
  font-size: clamp(3.2rem, 10vw, 5rem);
  line-height: 1;
}

.noscript-message {
  position: fixed;
  inset: auto 16px 16px;
  margin: 0;
  padding: 14px 18px;
  border-radius: 16px;
  color: #ffffff;
  background: var(--danger);
  font-weight: 700;
  text-align: center;
}

@media (max-width: 640px) {
  body {
    align-items: start;
    padding: 10px;
  }

  .app-shell {
    min-height: calc(100vh - 20px);
    border-radius: 22px;
  }

  .screen--active {
    justify-content: flex-start;
  }

  .rules,
  .answers {
    grid-template-columns: 1fr;
  }

  .topbar {
    flex-direction: column;
    gap: 6px;
    text-align: center;
  }

  .statement-card {
    min-height: 260px;
  }

  .btn {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
  }
}