/* --- VARIABEL & PENGATURAN GLOBAL --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
    --primary-color: #007BFF;
    --secondary-color: #6C757D;
    --success-color: #28A745;
    --danger-color: #DC3545;
    --warning-color: #FFC107;
    --info-color: #17A2B8;
    --light-color: #F8F9FA;
    --dark-color: #343A40;
    --white-color: #FFFFFF;
    --gray-color: #E9ECEF;
    
    --font-family: 'Inter', sans-serif;
    --border-radius: 8px;
    --box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    --transition: all 0.3s ease-in-out;
}

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

body {
    font-family: var(--font-family);
    line-height: 1.6;
    background-color: var(--light-color);
    color: var(--dark-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* --- TYPOGRAFI --- */
h1, h2, h3 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; color: var(--dark-color); }
h3 { font-size: 1.25rem; }

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: #0056b3;
    text-decoration: underline;
}

/* --- HEADER --- */
header {
    background-color: var(--white-color);
    border-bottom: 1px solid var(--gray-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.header-content h1 {
    margin: 0;
    color: var(--dark-color);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.search-form {
    display: flex;
    align-items: center;
    background-color: var(--light-color);
    border: 1px solid #ced4da;
    border-radius: 50px;
    padding: 5px 15px;
    transition: var(--transition);
}

.search-form:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.25);
}

.search-form input {
    border: none;
    background: none;
    outline: none;
    padding: 8px;
    font-size: 1rem;
    width: 250px;
}

.search-form button {
    border: none;
    background: none;
    color: var(--secondary-color);
    cursor: pointer;
    padding: 5px;
}

/* --- MAIN CONTENT --- */
main {
    padding: 3rem 0;
}

/* --- BUTTONS --- */
.btn {
    display: inline-block;
    padding: 10px 20px;
    font-size: 1rem;
    font-weight: 500;
    text-align: center;
    white-space: nowrap;
    vertical-align: middle;
    cursor: pointer;
    border: 1px solid transparent;
    border-radius: var(--border-radius);
    transition: var(--transition);
    text-decoration: none;
}

.btn-primary {
    color: var(--white-color);
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}
.btn-primary:hover { background-color: #0056b3; text-decoration: none; }

.btn-success {
    color: var(--white-color);
    background-color: var(--success-color);
    border-color: var(--success-color);
}
.btn-success:hover { background-color: #1e7e34; text-decoration: none; }

.btn-danger {
    color: var(--white-color);
    background-color: var(--danger-color);
    border-color: var(--danger-color);
}
.btn-danger:hover { background-color: #c82333; text-decoration: none; }

.btn-back {
    color: var(--secondary-color);
    background-color: transparent;
    border-color: transparent;
    font-weight: 600;
}
.btn-back:hover { color: var(--dark-color); text-decoration: underline; }

/* --- BOOK LIST & CARD --- */
.book-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 2rem;
}

.book-card {
    background: var(--white-color);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
}

.book-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.12);
}

.book-card img {
    width: 100%;
    height: 400px;
    object-fit: cover;
}

.book-info {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.book-info h3 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: var(--dark-color);
}

.book-info p {
    color: var(--secondary-color);
    margin-bottom: 1rem;
    flex-grow: 1;
}

/* --- DETAIL PAGE --- */
.detail-page {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.book-detail {
    display: flex;
    gap: 2.5rem;
    background: var(--white-color);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    width: 100%;
    max-width: 900px;
}

.detail-cover {
    width: 280px;
    height: auto;
    border-radius: var(--border-radius);
    box-shadow: 0 5px 15px rgba(0,0,0,0.15);
    flex-shrink: 0;
}

.detail-info {
    flex: 1;
}

.detail-info h1 {
    margin-top: 0;
    color: var(--dark-color);
}

.meta-info {
    font-style: italic;
    color: var(--secondary-color);
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
}

.sinopsis {
    font-size: 1.05rem;
    text-align: justify;
    margin: 2rem 0;
}

/* --- FORM (Versi Lebih Rapi) --- */
.add-book-form {
    background: var(--white-color);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    max-width: 800px;
    margin: 0 auto;
}

.add-book-form .form-group {
    display: grid; /* Menggunakan Grid untuk tata letak */
    grid-template-columns: 150px 1fr; /* Kolom 1: 150px untuk label, Kolom 2: sisanya untuk input */
    align-items: center; /* Menyelaraskan label dan input secara vertikal di tengah */
    gap: 20px; /* Jarak antara label dan input */
    margin-bottom: 1.5rem;
}

.add-book-form .form-group label {
    /* Label tidak perlu styling khusus lagi karena Grid mengaturnya */
    margin-bottom: 0; /* Reset margin bawah */
    text-align: right; /* Rata kanan label untuk kesan lebih rapi */
    font-weight: 500;
    color: var(--dark-color);
}

.add-book-form .form-group input,
.add-book-form .form-group textarea {
    padding: 12px 15px;
    border: 1px solid #ced4da;
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
}

.add-book-form .form-group input:focus,
.add-book-form .form-group textarea:focus {
    border-color: var(--primary-color);
    outline: 0;
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.25);
}

/* Membuat Textarea dan Tombol Submit memenuhi lebar penuh (2 kolom) */
.add-book-form .form-group:has(textarea),
.add-book-form .form-group:has(input[type="file"]) {
    grid-template-columns: 1fr; /* Kembali ke 1 kolom */
}

.add-book-form .form-group:has(textarea) label,
.add-book-form .form-group:has(input[type="file"]) label {
    text-align: left; /* Rata kiri label untuk textarea dan file */
    margin-bottom: 0.5rem; /* Berikan jarak lagi */
}

.add-book-form .form-group textarea {
    resize: vertical; /* Izinkan user mengubah tinggi textarea */
    min-height: 100px;
}

/* Style untuk tombol submit */
.add-book-form .form-group:last-child {
    display: block; /* Kembali ke display block untuk tombol */
    text-align: right; /* Rata kanan tombol */
    margin-top: 2rem;
}

.btn-submit {
    padding: 12px 40px; /* Lebar horizontal lebih besar */
    font-size: 1.1rem;
    font-weight: 600;
    width: auto; /* Lebar tombol mengikuti konten */
}

/* --- ALERTS --- */
.alert {
    padding: 1rem 1.5rem;
    margin-bottom: 2rem;
    border: 1px solid transparent;
    border-radius: var(--border-radius);
    text-align: center;
}

.alert.success {
    color: #155724;
    background-color: #d4edda;
    border-color: #c3e6cb;
}

.alert.error {
    color: #721c24;
    background-color: #f8d7da;
    border-color: #f5c6cb;
}

/* --- FOOTER --- */
footer {
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
    background-color: var(--dark-color);
    color: var(--light-color);
    border-top: 3px solid var(--primary-color);
}

/* --- RESPONSIVE DESIGN --- */
@media (max-width: 992px) {
    .book-detail {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
    .detail-cover {
        width: 60%;
        max-width: 280px;
    }
}

@media (max-width: 768px) {
    .header-content {
        justify-content: center;
        text-align: center;
    }
    .header-actions {
        width: 100%;
        justify-content: center;
    }
    .search-form input {
        width: 200px;
    }
    main {
        padding: 2rem 0;
    }
    .book-list {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        gap: 1.5rem;
    }
}

@media (max-width: 576px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    .book-list {
        grid-template-columns: 1fr;
    }
    .detail-cover {
        width: 100%;
    }
    .add-book-form {
        padding: 1.5rem;
    }
}