body {
  font-family: system-ui, sans-serif;
  margin: 20px;
  background: #f7f7f7;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  background: #fff;
  padding: 20px 25px;
  border-radius: 8px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.08);
}

h1, h2 {
  margin-top: 0;
}

button {
  padding: 8px 16px;
  border-radius: 4px;
  border: none;
  background: #2563eb;
  color: #fff;
  cursor: pointer;
}

button:disabled {
  background: #9ca3af;
}

input, select {
  padding: 6px 8px;
  border-radius: 4px;
  border: 1px solid #d1d5db;
  width: 100%;
  box-sizing: border-box;
}

label {
  font-weight: 600;
  display: block;
  margin-top: 12px;
  margin-bottom: 4px;
}

nav a {
  margin-right: 12px;
}