body {
  font-family: 'Segoe UI', Arial, sans-serif;
  background: #f5f5f8;
  color: #222;
  margin: 0;
  padding: 0;
}
header, footer {
  text-align: center;
  background: #fff;
  border-bottom: 2px solid #ddd;
  padding: 1rem 0;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}
nav a {
  margin: 0 1rem;
  color: #d33;
  text-decoration: none;
  font-weight: 600;
  transition: color 0.2s;
}
nav a:hover { color: #a00; }
.container {
  max-width: 900px;
  margin: 2rem auto;
  padding: 1.5rem;
  background: #fff;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  border-radius: 12px;
  text-align: center;
}
button {
  background-color: #d33;
  color: #fff;
  border: none;
  padding: 0.7rem 1.5rem;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1rem;
  transition: background 0.2s, transform 0.1s;
}
button:hover { background-color: #b11; }
button:active { transform: scale(0.97); }
input {
  padding: 0.6rem;
  border: 1px solid #ccc;
  border-radius: 6px;
  width: 80%;
  max-width: 300px;
}
.alert {
  margin-top: 1rem;
  padding: 1rem;
  border-radius: 8px;
  display: none;
}
.alert.success { background: #e0ffe0; border: 1px solid #8c8; }
.alert.error { background: #ffe0e0; border: 1px solid #c88; }
footer {
  border-top: 1px solid #ddd;
  padding: 1rem;
  color: #666;
  font-size: 0.9rem;
}