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

/* Body & Layout */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    background-color: #f4f4f4;
    color: #333;
}

.container {
    width: 80%;
    margin: 0 auto;
    padding: 20px;
}

h1, h2, h3 {
    color: #333;
    margin-bottom: 20px;
    font-weight: 600;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #4e73df, #F87171); /* Blue to Red Gradient */
    color: white;
    padding: 40px 20px;
    text-align: center;
    margin-bottom: 40px;
    border-radius: 8px;
    box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1);
}

.hero h1 {
    font-size: 2.5rem;
}

.hero p {
    font-size: 1.2rem;
    font-weight: 300;
}

/* Navigation Bar */
header {
    background: linear-gradient(135deg, #4e73df, #F87171); /* Blue to Red Gradient */
    padding: 10px 0;
}

nav ul {
    display: flex;
    justify-content: center;
    list-style: none;
}

nav ul li {
    margin-right: 30px;
}

nav ul li a {
    color: #ffffff;
    text-decoration: none;
    font-weight: bold;
    padding: 10px 15px;
    transition: color 0.3s ease;
}

nav ul li a:hover {
    color: #F87171; /* Red */
}

/* Social Media Icons Section (Positioned at the bottom and larger size) */
.social-icons {
    display: flex;
    justify-content: center;
    gap: 20px; /* Jarak antar ikon sosial media */
    margin-top: 40px;
    position: fixed;
    bottom: 40px; /* Menurunkan posisi ikon sedikit lebih tinggi dari bawah */
    width: 100%;
    z-index: 1000;
}

.social-icons a {
    display: inline-block;
    width: 50px;  /* Memperbesar ukuran ikon */
    height: 50px; /* Memperbesar ukuran ikon */
    background-color: transparent;
    border-radius: 50%;
    text-align: center;
    line-height: 50px;
    transition: transform 0.3s ease;
}

.social-icons a:hover {
    transform: scale(1.1);
}

.social-icons img {
    width: 60%;
    height: auto;
    opacity: 0.8;
}

.social-icons a:hover img {
    opacity: 1;
}

/* Cards */
.book-card {
    border: 1px solid #ddd;
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    background-color: white;
    box-shadow: 0px 4px 12px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.book-card:hover {
    transform: scale(1.05);
    box-shadow: 0px 6px 16px rgba(0, 0, 0, 0.2);
}

.book-card img {
    width: 80%;
    height: auto;
    border-radius: 10px;
    margin-bottom: 10px;
}

/* Book List */
.book-list {
    display: flex;
    flex-wrap: wrap;
    gap: 20px; /* Mengurangi jarak antar buku */
    margin-bottom: 40px;
    justify-content: center;
}

.book-item {
    width: calc(33% - 20px); /* Mengatur setiap buku menempati sepertiga lebar */
    background-color: white;
    border: 1px solid #ddd;
    border-radius: 12px;
    padding: 15px; /* Mengurangi padding agar lebih compact */
    text-align: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0px 4px 10px rgba(0, 0, 0, 0.1);
}

.book-item:hover {
    transform: scale(1.05);
    box-shadow: 0px 6px 16px rgba(0, 0, 0, 0.2);
}

.book-item img {
    width: 70%;  /* Ukuran gambar lebih kecil */
    height: auto;
    border-radius: 10px;
    margin-bottom: 10px;
}

.book-item h3 {
    font-size: 1.1rem; /* Mengurangi ukuran font judul buku */
    margin-bottom: 10px;
}

.book-item p {
    font-size: 0.9rem; /* Mengurangi ukuran font deskripsi buku */
}

/* Form Styles */
.form-group {
    margin-bottom: 20px;
}

.form-control {
    width: 100%;
    padding: 12px;
    border-radius: 8px;
    border: 1px solid #ddd;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-control:focus {
    border-color: #4e73df;
    outline: none;
}

input[type="date"] {
    background-color: white;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 30px;
}

table th, table td {
    padding: 15px;
    text-align: left;
    border: 1px solid #ddd;
}

table th {
    background-color: #f4f4f4;
    font-weight: 600;
}

table tbody tr:hover {
    background-color: #f1f1f1;
}

/* Login and Register Pages */
.login-register-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin-top: 100px;
}

.login-register-container form {
    width: 100%;
    max-width: 400px;
}

.login-register-container .form-group {
    margin-bottom: 20px;
}

.login-register-container h2 {
    text-align: center;
    margin-bottom: 20px;
    color: #4e73df;
}

.login-register-container .btn {
    width: 100%;
    padding: 14px;
    font-size: 16px;
}

.login-register-container .btn-primary {
    background-color: #F87171; /* Red */
}

.login-register-container .btn-primary:hover {
    background-color: white;
    color: #F87171;
}

.login-register-container .already-account {
    text-align: center;
    margin-top: 20px;
}

/* Responsif untuk layar kecil */
@media (max-width: 768px) {
    .book-item {
        width: calc(50% - 20px); /* Setiap buku menempati setengah lebar pada layar kecil */
    }

    .book-list {
        gap: 20px;
    }

    .hero h1 {
        font-size: 2rem;
    }
}


@media (max-width: 768px) {
    nav ul {
        display: none;
    }
    .mobile-nav-button {
        display: block;
    }
}


.flash-success {
    background-color: green;
    color: white;
}

.flash-danger {
    background-color: red;
    color: white;
}