body {
  background: linear-gradient(120deg, #74ebd5 0%, #ACB6E5 100%);
  min-height: 100vh;
  margin: 0;
  font-family: 'Segoe UI', 'Pretendard', Arial, sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
}

.container {
  background: #fff;
  padding: 2.5rem 2rem 2rem 2rem;
  border-radius: 1.2rem;
  box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.2);
  min-width: 320px;
  max-width: 380px;
  width: 100%;
  text-align: center;
}

h1 {
  margin-bottom: 2rem;
  color: #3a3a3a;
  font-weight: 700;
}

form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

input {
  padding: 0.8rem 1rem;
  border: 1px solid #d1d5db;
  border-radius: 0.6rem;
  font-size: 1rem;
  transition: border 0.2s;
}

input:focus {
  border: 1.5px solid #52ab9b;
  outline: none;
}

button {
  padding: 0.8rem 1rem;
  background: #66d0bc;
  color: #fff;
  border: none;
  border-radius: 0.6rem;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: filter 0.2s, background 0.2s;
}

button:hover {
  filter: brightness(1.05);
}

#result {
  margin-top: 1.5rem;
  font-size: 1.05rem;
  min-height: 1.5em;
  color: #333;
  word-break: break-all;
}