body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;
  background: #f3f4f6;
  margin: 0;
  padding: 2rem;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

.container {
  background: #fff;
  padding: 2rem;
  border-radius: 1rem;
  box-shadow: 0 0 15px rgba(0,0,0,0.1);
  max-width: 400px;
  width: 100%;
}

h1 {
  text-align: center;
  margin-bottom: 1rem;
}

form {
  display: flex;
  flex-direction: column;
}

label {
  margin-top: 1rem;
  font-weight: 500;
}

input, textarea {
  padding: 0.8rem;
  border: 1px solid #ccc;
  border-radius: 0.5rem;
  margin-top: 0.3rem;
  font-size: 1rem;
}

button {
  margin-top: 1.5rem;
  padding: 0.8rem;
  background-color: #25D366;
  color: white;
  font-size: 1.1rem;
  font-weight: bold;
  border: none;
  border-radius: 0.5rem;
  cursor: pointer;
  transition: background 0.3s ease;
}

button:hover {
  background-color: #1ebe5d;
}

.input-group {
  display: flex;
  align-items: center;
  margin-top: 0.3rem;
}

.prefix {
  background-color: #e5e7eb;
  padding: 0.8rem;
  border: 1px solid #ccc;
  border-radius: 0.5rem 0 0 0.5rem;
  font-size: 1rem;
  white-space: nowrap;
}

.input-group input {
  border-left: none;
  border-radius: 0 0.5rem 0.5rem 0;
  flex: 1;
}

.separator {
  text-align: center;
  margin: 1rem 0;
  font-weight: bold;
  color: #555;
}

.error-msg {
  color: red;
  font-size: 0.85rem;
  margin-top: 0.2rem;
}

select {
  padding: 0.7rem;
  border: 1px solid #ccc;
  border-radius: 0.5rem;
  margin-top: 0.3rem;
  font-size: 1rem;
  appearance: none;
  -webkit-appearance: none;
  background-color: #fff;
  background-image: url("data:image/svg+xml;charset=US-ASCII,%3Csvg%20width%3D'12'%20height%3D'7'%20viewBox%3D'0%200%2012%207'%20xmlns%3D'http://www.w3.org/2000/svg'%3E%3Cpath%20d%3D'M1%201l5%205%205-5'%20stroke%3D'%23333'%20stroke-width%3D'2'%20fill%3D'none'%20fill-rule%3D'evenodd'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.8rem center;
  background-size: 0.65rem auto;
}