body {
  margin: 0;
  padding: 40px 20px;
  font-family: 'Apple SD Gothic Neo', 'Malgun Gothic', sans-serif;
  background-color: #ffffff;
  color: #000000;
  transition: background-color 0.3s, color 0.3s;
}

body.dark {
  background-color: #1a1a1a;
  color: #f0f0f0;
}

.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  padding: 8px 16px;
  border: 2px solid #000000;
  border-radius: 20px;
  background: none;
  color: inherit;
  font-size: 16px;
  cursor: pointer;
  transition: border-color 0.3s;
}

body.dark .theme-toggle {
  border-color: #f0f0f0;
}

.container {
  max-width: 500px;
  margin: 0 auto;
}

h1 {
  margin-bottom: 4px;
}

.subtitle {
  color: #666;
  margin-bottom: 32px;
}

body.dark .subtitle {
  color: #aaa;
}

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

label {
  font-weight: bold;
  margin-bottom: 6px;
  margin-top: 16px;
}

input, select, textarea {
  padding: 12px;
  border: 1px solid #ccc;
  border-radius: 8px;
  font-size: 16px;
  background-color: #fff;
  color: #000;
  transition: border-color 0.3s, background-color 0.3s, color 0.3s;
}

body.dark input,
body.dark select,
body.dark textarea {
  background-color: #2a2a2a;
  color: #f0f0f0;
  border-color: #555;
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: #4a90d9;
}

textarea {
  resize: vertical;
}

.submit-btn {
  margin-top: 24px;
  padding: 14px;
  background-color: #4a90d9;
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 18px;
  font-weight: bold;
  cursor: pointer;
  transition: background-color 0.3s;
}

.submit-btn:hover {
  background-color: #357abd;
}