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

body {
  font-family: system-ui, sans-serif;
  background: #f5f7fa;
  color: #1a1a2e;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

header {
  background: #16213e;
  color: #fff;
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

header h1 { font-size: 1.5rem; }

nav a {
  color: #a8dadc;
  text-decoration: none;
  margin-left: 1.5rem;
  font-size: 0.95rem;
}

nav a:hover { color: #fff; }

main { flex: 1; display: flex; align-items: center; justify-content: center; }

.hero {
  text-align: center;
  padding: 3rem 2rem;
}

.hero h2 { font-size: 2rem; margin-bottom: 0.75rem; }
.hero p  { color: #555; margin-bottom: 1.5rem; }

button {
  background: #e63946;
  color: #fff;
  border: none;
  padding: 0.75rem 2rem;
  font-size: 1rem;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.2s;
}

button:hover { background: #c1121f; }

#api-result {
  margin-top: 1rem;
  font-weight: 600;
  color: #16213e;
}

.hidden { display: none; }

footer {
  text-align: center;
  padding: 1rem;
  font-size: 0.85rem;
  color: #888;
}