/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #1a5f7a;
    --secondary-color: #2d8fa3;
    --accent-color: #f39c12;
    --success-color: #27ae60;
    --danger-color: #e74c3c;
    --warning-color: #f39c12;
    --light-gray: #ecf0f1;
    --dark-gray: #2c3e50;
    --text-color: #333;
    --on-dark: #ffffff;
    --muted: #6b6b6b;
    --border-color: #ddd;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: #f8f9fa;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--secondary-color);
}

/* Navigation & Header */
.navbar {
    background-color: rgba(26,95,122,0.88);
    padding: 1rem 0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.12);
    position: sticky;
    top: 0;
    z-index: 110;
    backdrop-filter: blur(6px);
}

.navbar-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    color: white;
    font-size: 1.5rem;
    font-weight: bold;
}

.navbar-menu {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.navbar-menu a {
    color: white;
    transition: color 0.3s ease;
}

.navbar-menu a:hover {
    color: var(--accent-color);
}

.navbar-user {
    color: white;
    display: flex;
    gap: 1rem;
    align-items: center;
}

.navbar-user a {
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 4px;
    transition: all 0.3s ease;
    font-weight: 600;
    font-size: 0.95rem;
}

.navbar-user a:first-child {
    color: var(--primary-color);
    background-color: white;
}

.navbar-user a:last-child {
    color: white;
    background-color: var(--accent-color);
}

.navbar-user a:hover:first-child {
    background-color: #f0f0f0;
    color: var(--primary-color);
}

.navbar-user a:hover:last-child {
    background-color: #e67e22;
}

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

/* Hero Section */
.hero {
    background: transparent;
    color: white;
    padding: 3rem 1.5rem;
    text-align: center;
    min-height: 72vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.hero .container {
    max-width: 1100px;
}

.hero h1 {
    font-size: clamp(2rem, 5vw, 3.6rem);
    margin-bottom: 1rem;
    font-weight: 800;
    line-height: 1.05;
    color: var(--on-dark);
}

.hero p {
    font-size: clamp(1rem, 2.2vw, 1.25rem);
    margin-bottom: 1.75rem;
    color: rgba(255,255,255,0.95);
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-buttons .btn {
    border-radius: 8px;
    padding: 0.85rem 1.6rem;
    box-shadow: 0 8px 20px rgba(0,0,0,0.18);
    transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.hero-buttons .btn:active {
    transform: translateY(2px);
}

.btn-light {
    background-color: rgba(255,255,255,0.98);
    color: var(--primary-color);
    border: none;
}

.btn-light:hover {
    background-color: #ffffff;
}

.btn-secondary {
    background-color: var(--accent-color);
    color: white;
}

.btn-secondary:hover {
    background-color: #e67e22;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1rem;
    text-align: center;
    transition: all 0.3s ease;
    text-decoration: none;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--secondary-color);
}

.btn-secondary {
    background-color: var(--accent-color);
    color: white;
}

.btn-secondary:hover {
    background-color: #e67e22;
}

.btn-success {
    background-color: var(--success-color);
    color: white;
}

.btn-success:hover {
    background-color: #229954;
}

.btn-danger {
    background-color: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background-color: #c0392b;
}

.btn-light {
    background-color: white;
    color: var(--primary-color);
    border: 2px solid white;
}

.btn-light:hover {
    background-color: transparent;
    color: white;
}

.btn-block {
    width: 100%;
    margin-bottom: 0.5rem;
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--dark-gray);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(26, 95, 122, 0.1);
}

/* Cards */
.card {
    background-color: white;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

/* Ensure readable text on white cards */
.card, .about-section, .sidebar, .auth-card {
    color: var(--text-color);
}

.about-section p, .card-body p, .book-info p {
    color: var(--muted);
}

/* Main content wrapper styling for clear contrast */
.main-content {
    max-width: 1100px;
    margin: 2rem auto;
    padding: 1rem 20px;
}

/* Make sure headings on white backgrounds use primary dark color */
.about-section h2, .card-header h2, .book-info h3 {
    color: var(--primary-color);
}

/* Footer contrast */
.footer {
    background-color: var(--dark-gray);
    color: var(--on-dark);
    padding: 2rem;
    margin-top: 3rem;
    text-align: center;
}

/* Accessibility: focus states */
.btn:focus, a:focus {
    outline: 3px solid rgba(26,95,122,0.18);
    outline-offset: 2px;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

.card-header {
    border-bottom: 2px solid var(--light-gray);
    padding-bottom: 1rem;
    margin-bottom: 1rem;
}

.card-header h2 {
    margin: 0;
    color: var(--primary-color);
}

.card-body {
    color: var(--text-color);
}

/* Grid Layout */
.row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.col {
    flex: 1;
}

.col-md {
    grid-template-columns: repeat(2, 1fr);
}

.col-lg {
    grid-template-columns: repeat(3, 1fr);
}

/* Tables */
.table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1.5rem;
    background-color: white;
}

.table thead {
    background-color: var(--light-gray);
}

.table th,
.table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.table th {
    font-weight: 600;
    color: var(--dark-gray);
}

.table tbody tr:hover {
    background-color: #f5f5f5;
}

/* Alerts */
.alert {
    padding: 1rem;
    margin-bottom: 1.5rem;
    border-radius: 4px;
    border-left: 4px solid;
}

.alert-success {
    background-color: #d4edda;
    border-color: var(--success-color);
    color: #155724;
}

.alert-danger {
    background-color: #f8d7da;
    border-color: var(--danger-color);
    color: #721c24;
}

.alert-warning {
    background-color: #fff3cd;
    border-color: var(--warning-color);
    color: #856404;
}

.alert-info {
    background-color: #d1ecf1;
    border-color: #17a2b8;
    color: #0c5460;
}

/* Footer */
.footer {
    background-color: var(--dark-gray);
    color: white;
    padding: 2rem;
    margin-top: 3rem;
    text-align: center;
}

/* Responsive */
@media (max-width: 768px) {
    .navbar-menu {
        gap: 1rem;
    }

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

    .hero-buttons {
        flex-direction: column;
    }

    .table {
        font-size: 0.9rem;
    }

    .table th,
    .table td {
        padding: 0.5rem;
    }

    .row {
        grid-template-columns: 1fr;
    }
}

/* Auth Forms */
.auth-container {
    max-width: 400px;
    margin: 3rem auto;
    padding: 2rem;
}

.auth-card {
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    padding: 2rem;
}

.auth-card h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    text-align: center;
}

.auth-link {
    text-align: center;
    margin-top: 1rem;
}

.auth-link a {
    color: var(--primary-color);
    font-weight: 500;
}

/* Dashboard */
.dashboard-header {
    background-color: white;
    border-bottom: 2px solid var(--light-gray);
    padding: 1.5rem 0;
    margin-bottom: 2rem;
}

.dashboard-header h1 {
    color: var(--primary-color);
    margin: 0;
}

.sidebar {
    background-color: white;
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.sidebar-menu {
    list-style: none;
}

.sidebar-menu li {
    margin-bottom: 0.5rem;
}

.sidebar-menu a {
    display: block;
    padding: 0.75rem 1rem;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.sidebar-menu a:hover,
.sidebar-menu a.active {
    background-color: var(--light-gray);
    color: var(--primary-color);
}

/* Book Grid */
.book-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.5rem;
}

.book-item {
    background-color: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.book-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

.book-cover {
    width: 100%;
    height: 250px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 3rem;
}

.book-info {
    padding: 1rem;
}

.book-info h3 {
    color: var(--primary-color);
    font-size: 1rem;
    margin-bottom: 0.5rem;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.book-info p {
    font-size: 0.9rem;
    color: #666;
    margin-bottom: 0.5rem;
}

.book-status {
    font-size: 0.85rem;
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    display: inline-block;
}

.book-status.available {
    background-color: #d4edda;
    color: #155724;
}

.book-status.unavailable {
    background-color: #f8d7da;
    color: #721c24;
}

/* Background gambar untuk halaman index */
body.index-background {
    /* Use gradient background only (school image removed) */
    background-image: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    background-color: #f8f9fa;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    background-attachment: fixed;
    min-height: 100vh;
}

/* overlay agar teks tetap terbaca di atas gambar */
body.index-background::before {
    content: "";
    position: fixed;
    inset: 0;
    background: linear-gradient(180deg, rgba(0,0,0,0.48) 0%, rgba(0,0,0,0.22) 60%);
    z-index: 0;
    pointer-events: none;
}

/* Pastikan elemen utama berada di atas overlay */
.navbar,
.hero,
.container,
.footer {
    position: relative;
    z-index: 1;
}

/* Make hero section transparent so body background image shows through */
body.index-background .hero {
    background: transparent !important;
}