body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #121212;
  color: #fff;
  margin: 0;
  padding: 0;
  transition: background-color 0.3s ease, color 0.3s ease;
}

body.light {
  background-color: #ffffff;
  color: #000000;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: #1a1a1a;
  padding: 1rem 2rem;
  border-bottom: 1px solid #333;
}

body.light header {
  background: #f9f9f9;
  border-color: #ddd;
}

.logo {
  display: flex;
  align-items: center;
}

.logo img {
  height: 40px;
  width: auto;
}

.controls {
  display: flex;
  gap: 0.5rem;
}

main {
  padding: 2rem;
  text-align: center;
}

h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.subtitle {
  font-size: 1.1rem;
  color: #ccc;
  margin-bottom: 2rem;
}

.input-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

textarea {
  width: 80%;
  height: 200px;
  padding: 1rem;
  border: 1px solid #444;
  background-color: #1f1f1f;
  color: #fff;
  font-size: 1rem;
  border-radius: 10px;
  resize: vertical;
  transition: all 0.3s ease;
}

body.light textarea {
  background-color: #f4f4f4;
  color: #000;
  border-color: #ccc;
}

button {
  padding: 0.7rem 1.5rem;
  font-size: 1rem;
  font-weight: bold;
  background-color: #333;
  color: #fff;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.3s ease;
}

button:hover {
  background-color: #555;
}

body.light button {
  background-color: #ddd;
  color: #000;
}

body.light button:hover {
  background-color: #bbb;
}

.loader {
  margin-top: 2rem;
  border: 8px solid #f3f3f3;
  border-top: 8px solid #3498db;
  border-radius: 50%;
  width: 50px;
  height: 50px;
  animation: spin 1s linear infinite;
}

.hidden {
  display: none;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.results {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2rem;
  margin-top: 2rem;
}

.result-box {
  flex: 1;
  min-width: 300px;
  max-width: 400px;
  background-color: #222;
  border: 1px solid #333;
  padding: 1rem;
  border-radius: 10px;
  text-align: left;
  animation: fadeIn 0.6s ease;
}

body.light .result-box {
  background-color: #fafafa;
  border-color: #ccc;
}

.result-box h2 {
  margin-top: 0;
  font-size: 1.2rem;
  margin-bottom: 1rem;
}

ul {
  list-style-type: none;
  padding: 0;
}

li {
  padding: 0.5rem;
  border-bottom: 1px solid #333;
  word-break: break-word;
}

body.light li {
  border-bottom: 1px solid #ddd;
}

footer {
  margin-top: 3rem;
  padding: 1rem;
  text-align: center;
  background: #1a1a1a;
  color: #fff;
  font-size: 0.9rem;
}

body.light footer {
  background: #f2f2f2;
  color: #333;
}

.copy-btn {
  margin-top: 1rem;
  padding: 0.5rem 1.2rem;
  background-color: #4caf50;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-weight: bold;
  transition: background-color 0.3s ease;
}

.copy-btn:hover {
  background-color: #45a049;
}

body.light .copy-btn {
  background-color: #3cb371;
}

body.light .copy-btn:hover {
  background-color: #2e8b57;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}