:root {
  --font-display: 'Plus Jakarta Sans', 'Nunito', sans-serif;
  --font-body: 'Nunito', 'Plus Jakarta Sans', sans-serif;

  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;

  /* Warm earthy palette for architecture */
  --color-bg: #fdf5ec;
  --color-surface: #ffffff;
  --color-text: #1a1a2e;
  --color-text-muted: #6b7280;
  --color-primary: #b45309;
  --color-primary-hover: #92400e;
  --color-primary-light: #fef3c7;
  --color-success: #10b981;
  --color-success-light: #d1fae5;
  --color-error: #ef4444;
  --color-error-light: #fee2e2;
  --color-warning: #f59e0b;
  --color-warning-light: #fef3c7;
  --color-accent-1: #d97706;
  --color-accent-2: #dc2626;
  --color-accent-3: #0891b2;
  --color-accent-4: #7c3aed;

  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
  --shadow-glow: 0 0 20px rgba(180,83,9,0.2);

  --transition-fast: 150ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 250ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-bounce: 400ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ─── Global ─── */

body {
  padding-top: 44px;
  background: var(--color-bg);
  background-image:
    radial-gradient(circle at 20% 20%, rgba(217,119,6,0.06) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(220,38,38,0.04) 0%, transparent 50%),
    radial-gradient(circle at 50% 50%, rgba(8,145,178,0.04) 0%, transparent 60%);
  overflow: hidden;
}

#app {
  width: 100%;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
}

/* ─── Screens ─── */

.screen {
  display: none;
  width: 100%;
  max-width: 520px;
  padding: var(--space-6);
  text-align: center;
  animation: fadeSlideIn 0.4s ease-out;
}
.screen.active { display: flex; flex-direction: column; align-items: center; }

@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ─── Start Screen ─── */

.start-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-6);
}

.logo-flag {
  font-size: 4rem;
  animation: floatBounce 2s ease-in-out infinite;
}

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

.game-title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 800;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.1;
}

.game-subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  font-weight: 600;
}

.difficulty-select {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  width: 100%;
  max-width: 340px;
}

.difficulty-label {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.difficulty-buttons {
  display: flex;
  gap: var(--space-2);
}

.btn-diff {
  flex: 1;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  font-weight: 700;
  background: var(--color-surface);
  color: var(--color-text);
  border: 2px solid transparent;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
  cursor: pointer;
}
.btn-diff:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.btn-diff.active {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
  color: var(--color-primary);
}

/* ─── Buttons ─── */

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-8);
  background: var(--color-primary);
  color: #fff;
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 800;
  border-radius: var(--radius-xl);
  border: none;
  box-shadow: var(--shadow-md), var(--shadow-glow);
  transition: all var(--transition-bounce);
  cursor: pointer;
}
.btn-primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-3px) scale(1.02);
  box-shadow: var(--shadow-lg), 0 0 30px rgba(180,83,9,0.3);
}
.btn-primary:active {
  transform: translateY(0) scale(0.98);
}

.btn-big {
  padding: var(--space-4) var(--space-10);
  font-size: var(--text-xl);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  background: var(--color-surface);
  color: var(--color-text);
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  border-radius: var(--radius-lg);
  border: 2px solid var(--color-primary-light);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
  margin-top: var(--space-3);
  cursor: pointer;
}
.btn-secondary:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.btn-icon {
  font-size: 1.2em;
}

/* ─── Game Screen ─── */

.game-header {
  display: flex;
  justify-content: center;
  gap: var(--space-6);
  width: 100%;
  margin-bottom: var(--space-4);
}

.hud-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  background: var(--color-surface);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  min-width: 80px;
}

.hud-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.hud-value {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 800;
  color: var(--color-primary);
  font-variant-numeric: tabular-nums lining-nums;
}

.game-body {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
}

/* ─── Building Image ─── */

.building-display {
  width: 100%;
  display: flex;
  justify-content: center;
}

.building-container {
  width: 280px;
  height: 200px;
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 3px solid #e5e0d5;
  transition: transform var(--transition-bounce);
}

.building-container.pop {
  animation: buildingPop 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes buildingPop {
  0% { transform: scale(0.7); opacity: 0; }
  60% { transform: scale(1.08); }
  100% { transform: scale(1); opacity: 1; }
}

.building-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-md);
}

.question-text {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--color-text);
}

.location-hint {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-weight: 600;
  margin-top: -0.25rem;
}

/* ─── Answers ─── */

.answers-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
  width: 100%;
  max-width: 440px;
}

.btn-answer {
  padding: var(--space-3) var(--space-3);
  background: var(--color-surface);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 700;
  border-radius: var(--radius-lg);
  border: 2.5px solid #e5e0d5;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-fast);
  min-height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  line-height: 1.3;
  cursor: pointer;
}
.btn-answer:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.btn-answer:active {
  transform: translateY(0);
}
.btn-answer.correct {
  border-color: var(--color-success);
  background: var(--color-success-light);
  color: #065f46;
  animation: correctPulse 0.4s ease;
}
.btn-answer.wrong {
  border-color: var(--color-error);
  background: var(--color-error-light);
  color: #991b1b;
  animation: wrongShake 0.4s ease;
}
.btn-answer.disabled {
  pointer-events: none;
  opacity: 0.5;
}

@keyframes correctPulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.06); }
  100% { transform: scale(1); }
}

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

/* ─── Feedback ─── */

.feedback-area {
  min-height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.feedback-card {
  display: none;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: var(--text-base);
  animation: feedbackPop 0.3s ease;
}
.feedback-card.show { display: flex; }
.feedback-card.correct {
  background: var(--color-success-light);
  color: #065f46;
}
.feedback-card.wrong {
  background: var(--color-error-light);
  color: #991b1b;
}

.feedback-emoji { font-size: 1.4em; }

@keyframes feedbackPop {
  0% { transform: scale(0.6); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}

/* ─── Result Screen ─── */

.result-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
}

.result-emoji {
  font-size: 5rem;
  animation: trophyBounce 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes trophyBounce {
  0% { transform: scale(0); }
  60% { transform: scale(1.2); }
  100% { transform: scale(1); }
}

.result-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-text);
}

.result-score {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--color-primary);
}

.result-msg {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  font-weight: 600;
}

.result-stars {
  font-size: 2.5rem;
  display: flex;
  gap: var(--space-2);
  animation: starsReveal 0.8s ease;
}

@keyframes starsReveal {
  0% { opacity: 0; transform: scale(0.5); }
  100% { opacity: 1; transform: scale(1); }
}

/* ─── Back Nav ─── */

.back-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 200;
  padding: 0.6rem 1.25rem;
  background: rgba(253,245,236,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(180,83,9,0.08);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-family: var(--font-display, 'Plus Jakarta Sans', sans-serif);
  font-size: 0.9rem;
  font-weight: 700;
  color: #b45309;
  text-decoration: none;
  transition: opacity 150ms ease;
}
.back-link:hover { opacity: 0.7; }

.footer-home {
  display: block;
  font-weight: 700;
  color: #b45309;
  font-size: 0.85rem;
  margin-bottom: 0.3rem;
}

/* ─── Footer ─── */

.site-footer {
  position: fixed;
  bottom: 0;
  width: 100%;
  text-align: center;
  padding: var(--space-2);
}

.site-footer a {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-decoration: none;
  opacity: 0.6;
}
.site-footer a:hover { opacity: 1; }

/* ─── Mobile ─── */

@media (max-width: 480px) {
  .screen { padding: var(--space-4); }

  .building-container { width: 220px; height: 160px; }

  .game-header { gap: var(--space-3); }
  .hud-item { padding: var(--space-2) var(--space-3); min-width: 68px; }

  .answers-grid { gap: var(--space-2); }
  .btn-answer { padding: var(--space-2) var(--space-3); font-size: var(--text-xs); min-height: 48px; }

  .btn-big { padding: var(--space-3) var(--space-6); font-size: var(--text-lg); }
}