@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700;900&display=swap");

:root {
  --gradient-bg: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #334155 100%);
  --gradient-card: linear-gradient(145deg, #ffffff 0%, #f8fafc 100%);
  --gradient-primary: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
  --gradient-success: linear-gradient(135deg, #059669 0%, #10b981 100%);
  --gradient-danger: linear-gradient(135deg, #dc2626 0%, #ef4444 100%);

  --color-primary: #3b82f6;
  --color-primary-dark: #2563eb;
  --color-success: #10b981;
  --color-success-bg: #d1fae5;
  --color-success-border: #059669;
  --color-danger: #ef4444;
  --color-danger-bg: #fee2e2;
  --color-danger-border: #dc2626;

  --color-text: #1e293b;
  --color-text-light: #64748b;
  --color-white: #ffffff;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.2);

  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 24px;

  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Inter", sans-serif;
  background: var(--gradient-bg);
  min-height: 100vh;
  color: var(--color-text);
  overflow-x: hidden;
}

/* ===== SCREENS ===== */
.screen {
  display: none;
  min-height: 100vh;
  padding: 1rem;
  align-items: center;
  justify-content: center;
}
.screen.active {
  display: flex;
  animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== HOME ===== */
.home-card {
  background: var(--gradient-card);
  border-radius: var(--radius-lg);
  padding: 3rem 2.5rem;
  text-align: center;
  box-shadow: var(--shadow-lg);
  max-width: 420px;
  width: 100%;
}

.home-emoji {
  font-size: 4rem;
  margin-bottom: 1rem;
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.home-title {
  font-size: 2.2rem;
  font-weight: 900;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.3rem;
}

.home-subtitle {
  font-size: 1rem;
  color: var(--color-text-light);
  margin-bottom: 2rem;
}

.home-buttons {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  margin-bottom: 2rem;
}

.home-stats {
  display: flex;
  justify-content: center;
  gap: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid #e2e8f0;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
}

.stat-label {
  font-size: 0.75rem;
  color: var(--color-text-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ===== BUTTONS ===== */
.btn {
  border: none;
  border-radius: var(--radius-sm);
  padding: 1rem 1.5rem;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.btn-primary {
  background: var(--gradient-primary);
  color: var(--color-white);
  box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(59, 130, 246, 0.5);
}
.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: var(--color-white);
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}
.btn-secondary:hover {
  background: #eff6ff;
  transform: translateY(-2px);
}

.btn-accent {
  background: var(--gradient-success);
  color: var(--color-white);
  box-shadow: 0 4px 15px rgba(16, 185, 129, 0.4);
}
.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(16, 185, 129, 0.5);
}

.btn-icon {
  font-size: 1.1rem;
}

/* ===== GAME ===== */
.game-wrapper {
  max-width: 600px;
  width: 100%;
}

.game-header {
  margin-bottom: 1.5rem;
}

.progress-bar {
  height: 8px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 10px;
  overflow: hidden;
  margin-bottom: 0.8rem;
}

.progress-fill {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: 10px;
  width: 10%;
  transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.game-meta {
  display: flex;
  justify-content: space-between;
  color: var(--color-white);
  font-weight: 600;
  font-size: 0.9rem;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.question-card {
  background: var(--gradient-card);
  border-radius: var(--radius-md);
  padding: 2rem;
  box-shadow: var(--shadow-lg);
  margin-bottom: 1.5rem;
  text-align: center;
}

.question-cat {
  display: inline-block;
  background: var(--gradient-primary);
  color: var(--color-white);
  padding: 0.3rem 1rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.question-text {
  font-size: 1.3rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--color-text);
}

/* ===== ANSWERS ===== */
.answers-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8rem;
  margin-bottom: 1.5rem;
}

.answer-btn {
  background: var(--color-white);
  border: 2px solid #e2e8f0;
  border-radius: var(--radius-sm);
  padding: 1rem;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.8rem;
  text-align: left;
  font-family: inherit;
}

.answer-btn:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.answer-btn.selected {
  border-color: var(--color-primary);
  background: #eff6ff;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.answer-btn.correct {
  border-color: var(--color-success-border);
  background: var(--color-success-bg);
  box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.3);
  animation: popCorrect 0.4s ease;
}

.answer-btn.wrong {
  border-color: var(--color-danger-border);
  background: var(--color-danger-bg);
  box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.3);
  animation: shake 0.4s ease;
}

.answer-btn.disabled {
  pointer-events: none;
  opacity: 0.6;
}

.answer-letter {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--gradient-primary);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  flex-shrink: 0;
}

.answer-btn.correct .answer-letter {
  background: var(--gradient-success);
}

.answer-btn.wrong .answer-letter {
  background: var(--gradient-danger);
}

.answer-text {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-text);
}

.btn-next {
  width: 100%;
  max-width: 300px;
  margin: 0 auto;
  display: flex;
}

/* ===== FEEDBACK TOAST ===== */
.feedback-toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  padding: 1rem 2rem;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-white);
  z-index: 100;
  opacity: 0;
  pointer-events: none;
  text-align: center;
  max-width: 90%;
  box-shadow: var(--shadow-lg);
}

.feedback-toast.show {
  animation: toastIn 0.4s ease forwards;
}

.feedback-toast.hide {
  animation: toastOut 0.3s ease forwards;
}

.feedback-toast.success {
  background: var(--gradient-success);
}

.feedback-toast.error {
  background: var(--gradient-danger);
}

@keyframes toastIn {
  0% { opacity: 0; transform: translateX(-50%) translateY(100px); }
  100% { opacity: 1; transform: translateX(-50%) translateY(0); }
}

@keyframes toastOut {
  0% { opacity: 1; transform: translateX(-50%) translateY(0); }
  100% { opacity: 0; transform: translateX(-50%) translateY(100px); }
}

@keyframes popCorrect {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  40% { transform: translateX(6px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}

/* ===== RESULTS ===== */
.results-card {
  background: var(--gradient-card);
  border-radius: var(--radius-lg);
  padding: 3rem 2.5rem;
  text-align: center;
  box-shadow: var(--shadow-lg);
  max-width: 420px;
  width: 100%;
}

.results-emoji {
  font-size: 4rem;
  margin-bottom: 0.5rem;
  animation: bounce 1s ease;
}

.results-title {
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--color-text);
  margin-bottom: 1rem;
}

.results-score {
  margin-bottom: 1.5rem;
}

.score-big {
  font-size: 4rem;
  font-weight: 900;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.score-total {
  font-size: 1.5rem;
  color: var(--color-text-light);
  font-weight: 600;
}

.share-result {
  background: #f1f5f9;
  border-radius: var(--radius-sm);
  padding: 1rem;
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
  letter-spacing: 0.2em;
  word-break: break-all;
}

.results-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.2rem;
  margin-bottom: 2rem;
}

.results-buttons {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

/* ===== FOOTER ===== */
.footer {
  text-align: center;
  padding: 1.5rem 1rem;
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.8rem;
  position: fixed;
  bottom: 0;
  width: 100%;
}

.footer a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  font-weight: 600;
  border-bottom: 1px solid rgba(255, 255, 255, 0.3);
  transition: var(--transition);
}

.footer a:hover {
  color: var(--color-white);
  border-bottom-color: var(--color-white);
}

/* ===== UTILITIES ===== */
.hidden {
  display: none !important;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 480px) {
  .home-card,
  .results-card {
    padding: 2rem 1.5rem;
  }

  .home-title {
    font-size: 1.8rem;
  }

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

  .question-text {
    font-size: 1.1rem;
  }

  .home-stats {
    gap: 1.2rem;
  }

  .results-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
  }
}