* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: linear-gradient(135deg, #60a5fa, #2563eb);
  min-height: 100vh;
  color: #0f172a;
}

.container {
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
}

.weather-app {
  width: 100%;
  max-width: 450px;
  background: white;
  border-radius: 16px;
  padding: 25px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
}

h1 {
  margin-top: 0;
  margin-bottom: 8px;
  text-align: center;
}

.subtitle {
  margin-top: 0;
  margin-bottom: 20px;
  text-align: center;
  color: #475569;
}

.search-section {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
}

#cityInput {
  flex: 1;
  padding: 12px;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  font-size: 16px;
}

#searchBtn {
  border: none;
  background: #2563eb;
  color: white;
  padding: 12px 18px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 16px;
}

#searchBtn:hover {
  background: #1d4ed8;
}

.message {
  text-align: center;
  color: #475569;
  margin-bottom: 15px;
}

.weather-card {
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: 14px;
  padding: 20px;
}

.weather-card h2 {
  margin-top: 0;
  margin-bottom: 10px;
}

.weather-card p {
  margin: 8px 0;
  font-size: 16px;
}

.hidden {
  display: none;
}

@media (max-width: 500px) {
  .weather-app {
    padding: 20px;
  }

  .search-section {
    flex-direction: column;
  }

  #searchBtn,
  #cityInput {
    width: 100%;
  }
}