body{
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    background: linear-gradient(90deg, #30a0f0, #c000de);
}
.logout-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #ff3b30;
    width: auto;
    padding: 5px 20px;
    border-radius: 5px;
    color: rgb(255, 255, 255);
    text-decoration: none;
}
.logout-btn:hover {
    background-color: #d9342b;
}

nav{
    background-color: #444444;
    width: 100%;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: right;
    position: sticky;
    top: 0;
    overflow: visible;
    z-index: 1000;
    
}
ul{
    display: flex;
    flex-direction: row;
    align-items: center;
    margin: 0;
}
li{
    
    
    font-size: 17px;
    list-style-type: none;
    margin-right: 40px;
}
nav a{
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #0088ff;
    width: auto;
    padding: 5px 20px;
    border-radius: 5px;
    color: rgb(255, 255, 255);
    text-decoration: none;
}
nav span{
    color: white;
    margin-right: 10px;
}

nav a:hover{
    background-color: #0068c3;
    
    transform: scale(1.15);
    transition: all 0.1s ease;
}
.book{
    height: 55px;
    width: 60px;
    position: absolute;
    top: 2px;
    left:  15px;

}
.error {
    color: #ff0000;
    margin-top: -15px;
    margin-bottom: 10px;
}
textarea {
    width: 95%;
    height: 150px;
    padding: 10px;
    margin-top: 25px;
    margin-bottom: 20px;
    border-radius: 5px;
    border: 1px solid #ccc;
}
/* Hamburger menu button */
.hamburger {
    display: none;
    font-size: 30px;
    color: white;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0 20px;
    position: absolute;
    left: 10px;
    top: 10px;
}

/* Responsive styles */
@media screen and (max-width: 426px) {
    .hamburger {
        display: block;
    }
    
    nav {
        justify-content: center;
        position: sticky;
    }
    .book{
        left: auto;
        right: 5px;
    }
    nav ul {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 60px;
        left: 0;
        width: 100%;
        background-color: #444444;
        padding: 10px 0;
        box-shadow: 0 5px 10px rgba(0,0,0,0.2);
    }
    
    nav ul.show {
        display: flex;
    }
    
    nav li {
        margin: 10px 0;
        width: 100%;
        text-align: center;
    }
    
    nav a {
        width: 80%;
        margin: 0 auto;
    }
    
    nav span {
        margin: 5px 0;
    }
    .logout-btn {
        width: 80%;
       margin: 0 auto;
    }
}