* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Noto Serif SC', serif;
  background: #f9f3e9;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #444;
}

.container {
  max-width: 500px;
  padding: 20px;
}

h1 {
  font-size: 2rem;
  margin-bottom: 10px;
  color: #8b5a2b;
}

p {
  margin-bottom: 20px;
  color: #666;
  font-size: 1.1rem;
}

input[type="text"] {
  width: 100%;
  padding: 12px;
  margin-bottom: 20px;
  border: 2px solid #d4c8a1;
  border-radius: 8px;
  font-size: 1rem;
  background: #fff;
  color: #333;
  outline: none;
}

input::placeholder {
  color: #aaa;
}

button {
  background: #8b5a2b;
  color: white;
  border: none;
  padding: 12px 24px;
  font-size: 1rem;
  cursor: pointer;
  border-radius: 8px;
  margin-bottom: 30px;
  transition: background 0.3s;
}

button:hover {
  background: #6b451b;
}

/* Book Styles */
.book {
  width: 300px;
  height: 200px;
  position: relative;
  perspective: 1000px;
  margin: 30px auto;
  cursor: pointer;
}

.book-cover {
  position: absolute;
  width: 100%;
  height: 100%;
  border-radius: 15px;
  backface-visibility: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  font-weight: bold;
  border: 3px solid #8b5a2b;
}

.front {
  background: #c9a567;
  background-image: linear-gradient(135deg, #c9a567 0%, #a6834a 100%);
  color: white;
  transform: rotateY(0);
}

.back {
  background: #f5f0e6;
  color: #555;
  transform: rotateY(-180deg);
  overflow: hidden;
}

#result {
  padding: 20px;
  line-height: 1.8;
}

/* Flip Animation */
.book.flipped .front {
  transform: rotateY(180deg);
}

.book.flipped .back {
  transform: rotateY(0deg);
}