* {
    box-sizing: border-box;
    font-family: Arial, sans-serif;
}

body {
    background: linear-gradient(135deg, #667eea, #764ba2);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.container {
    perspective: 1000px;
}

.flip-card {
    width: 320px;
    height: 400px;
}

.flip-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.8s;
    transform-style: preserve-3d;
}

.flipped .flip-card-inner {
    transform: rotateY(180deg);
}

.flip-card-front, .flip-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    background: white;
    border-radius: 15px;
    padding: 20px;
    backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.flip-card-back {
    transform: rotateY(180deg);
}

form {
    width: 100%;
    display: flex;
    flex-direction: column;
}

input {
    padding: 10px;
    margin: 8px 0;
    border-radius: 5px;
    border: 1px solid #ccc;
}

button {
    padding: 10px;
    background: #667eea;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    margin-top: 10px;
}

.toggle-text {
    margin-top: 15px;
    color: #667eea;
    cursor: pointer;
}

.author-credit {
    font-size: 12px;
    margin-top: 15px;
    color: #888;
}