body {
  font-family: "Apple SD Gothic Neo", sans-serif;
  background: #fefefe;
  padding: 20px;
}
.container {
  max-width: 600px;
  margin: auto;
  background: white;
  padding: 25px;
  border-radius: 10px;
  box-shadow: 0 0 8px rgba(0,0,0,0.1);
}
button {
  margin: 5px 5px 15px 0;
  padding: 10px 20px;
  font-size: 1em;
  border: none;
  border-radius: 6px;
  background-color: #009688;
  color: white;
  cursor: pointer;
}
button:hover {
  background-color: #00796b;
}
input {
  padding: 10px;
  width: 100%;
  margin: 10px 0 20px;
  border-radius: 5px;
  border: 1px solid #ccc;
}
.result {
  margin-top: 20px;
  padding: 15px;
  background: #e0f2f1;
  border-left: 5px solid #00796b;
  font-weight: bold;
}
.notice {
  margin-top: 15px;
  font-size: 0.9em;
  color: #555;
}