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

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh; 
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  color: #333;
  background: #f9f9f9;
  margin: 0;
}

main, .section {
  flex: 1;
  padding: 2em 1em;
  max-width: 900px;
  margin: 0 auto;
}
header {
  background: linear-gradient(135deg, #3b82f6, #2563eb);
  color: white;
  padding: 2em 1em;
  text-align: center;
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  position: sticky;
  top: 0;
  z-index: 100;
}

header h1 {
  font-size: 2.5em;
  margin-bottom: 0.3em;
  font-weight: 700;
  text-shadow: 1px 1px 3px rgba(0,0,0,0.3);
}

header p {
  font-size: 1.2em;
  margin-bottom: 1em;
  font-weight: 400;
}

nav {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1.5em;
}

nav a {
  color: white;
  text-decoration: none;
  font-weight: 600;
  font-size: 1em;
  padding: 0.5em 1em;
  border-radius: 6px;
  transition: background 0.3s, transform 0.2s;
}

nav a:hover {
  background: rgba(255,255,255,0.2);
  transform: translateY(-2px);
}
.section {
  padding: 2em 1em;
  max-width: 900px;
  margin: 0 auto;
}

.city-image {
  width: 100%;
  max-width: 400px;
  height: auto;
  margin: 1em 0;
  border-radius: 12px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.2);
  cursor: pointer;
  transition: transform 0.3s, box-shadow 0.3s;
}

.city-image:hover {
  transform: scale(1.05);
  box-shadow: 0 8px 20px rgba(0,0,0,0.3);
}

#feedback {
  display: none;
  margin: 1em 0;
  font-weight: bold;
  font-size: 1.2em;
}

#fact {
  display: none;
  margin-top: 1em;
  background: #fff;
  padding: 1.2em;
  border-radius: 12px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.15);
  font-size: 1em;
}

#score {
  font-size: 1.3em;
  margin-top: 1em;
}

button {
  padding: 0.6em 1.2em;
  margin: 0.5em;
  font-size: 1em;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  background: #3b82f6;
  color: white;
  font-weight: 500;
  transition: background 0.3s, transform 0.2s;
}

button:hover {
  background: #2563eb;
  transform: translateY(-2px);
}

button:disabled {
  background: #9ca3af;
  cursor: not-allowed;
}

#nextCity {
  display: none;
  margin-top: 1em;
  background: #10b981;
}

#nextCity:hover {
  background: #059669;
}


footer {
  background: #f3f4f6;
  color: #374151;
  padding: 1.5em 1em;
  text-align: center;
  font-size: 0.9em;
  border-top: 2px solid #e5e7eb;
}
footer p {
  margin: 0;
}
@media (max-width: 600px) {
  nav a {
    display: block;
    margin: 0.4em 0;
  }

  .choice-btn {
    display: block;
    width: 80%;
    margin: 0.5em auto;
  }

  #cityImage {
    max-width: 90%;
  }
}