/* Library Management System - Custom Styles */
/* Color Scheme: White, Gold, Red */

:root {
    --primary-white: #FFFFFF;
    --primary-gold: #FFD700;
    --dark-gold: #DAA520;
    --primary-red: #DC143C;
    --dark-red: #8B0000;
    --light-gray: #F5F5F5;
    --medium-gray: #CCCCCC;
    --dark-gray: #333333;
    --text-dark: #2C2C2C;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--light-gray);
    color: var(--text-dark);
    line-height: 1.6;
}

/* Navigation Bar */
.navbar {
    background: linear-gradient(135deg, var(--dark-red) 0%, var(--primary-red) 100%);
    padding: 1rem 2rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-white) !important;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.navbar-brand:hover {
    color: var(--primary-gold) !important;
}

.navbar-nav .nav-link {
    color: var(--primary-white) !important;
    margin: 0 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: all 0.3s ease;
}

.navbar-nav .nav-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--primary-gold) !important;
}

.navbar-nav .nav-link.active {
    background-color: var(--primary-gold);
    color: var(--dark-red) !important;
    font-weight: 600;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

/* Cards */
.card {
    background-color: var(--primary-white);
    border: none;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
    overflow: hidden;
}

.card-header {
    background: linear-gradient(135deg, var(--primary-gold) 0%, var(--dark-gold) 100%);
    color: var(--dark-red);
    font-weight: bold;
    font-size: 1.3rem;
    padding: 1rem 1.5rem;
    border-bottom: 3px solid var(--primary-red);
}

.card-body {
    padding: 1.5rem;
}

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

.stat-card {
    background: linear-gradient(135deg, var(--primary-white) 0%, var(--light-gray) 100%);
    border-left: 5px solid var(--primary-gold);
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.stat-card.danger {
    border-left-color: var(--primary-red);
}

.stat-card h3 {
    color: var(--dark-gray);
    font-size: 0.9rem;
    text-transform: uppercase;
    margin-bottom: 0.5rem;
}

.stat-card .stat-value {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--dark-red);
}

/* Buttons */
.btn {
    padding: 0.6rem 1.5rem;
    border-radius: 5px;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-gold) 0%, var(--dark-gold) 100%);
    color: var(--dark-red);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--dark-gold) 0%, var(--primary-gold) 100%);
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(218, 165, 32, 0.4);
}

.btn-danger {
    background: linear-gradient(135deg, var(--primary-red) 0%, var(--dark-red) 100%);
    color: var(--primary-white);
}

.btn-danger:hover {
    background: linear-gradient(135deg, var(--dark-red) 0%, var(--primary-red) 100%);
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(220, 20, 60, 0.4);
}

.btn-secondary {
    background-color: var(--medium-gray);
    color: var(--dark-gray);
}

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

.btn-success {
    background-color: #28a745;
    color: var(--primary-white);
}

.btn-success:hover {
    background-color: #218838;
    transform: translateY(-2px);
}

.btn-sm {
    padding: 0.4rem 1rem;
    font-size: 0.9rem;
}

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

.form-label {
    display: block;
    font-weight: 600;
    color: var(--dark-gray);
    margin-bottom: 0.5rem;
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--medium-gray);
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-gold);
    box-shadow: 0 0 0 3px rgba(255, 215, 0, 0.1);
}

.form-control.is-invalid {
    border-color: var(--primary-red);
}

.invalid-feedback {
    color: var(--primary-red);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

/* Tables */
.table-container {
    overflow-x: auto;
    margin-top: 1rem;
}

table {
    width: 100%;
    border-collapse: collapse;
    background-color: var(--primary-white);
}

thead {
    background: linear-gradient(135deg, var(--primary-gold) 0%, var(--dark-gold) 100%);
}

thead th {
    padding: 1rem;
    text-align: left;
    color: var(--dark-red);
    font-weight: bold;
    border-bottom: 3px solid var(--primary-red);
}

tbody tr {
    border-bottom: 1px solid var(--light-gray);
    transition: background-color 0.2s ease;
}

tbody tr:hover {
    background-color: rgba(255, 215, 0, 0.1);
}

tbody td {
    padding: 1rem;
    color: var(--text-dark);
}

.badge {
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.badge-success {
    background-color: #28a745;
    color: var(--primary-white);
}

.badge-danger {
    background-color: var(--primary-red);
    color: var(--primary-white);
}

.badge-warning {
    background-color: var(--primary-gold);
    color: var(--dark-red);
}

/* Alerts */
.alert {
    padding: 1rem 1.5rem;
    border-radius: 5px;
    margin-bottom: 1.5rem;
    border-left: 5px solid;
}

.alert-success {
    background-color: #d4edda;
    border-color: #28a745;
    color: #155724;
}

.alert-danger {
    background-color: #f8d7da;
    border-color: var(--primary-red);
    color: var(--dark-red);
}

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

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

/* Search Bar */
.search-container {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.search-container input {
    flex: 1;
}

/* Book Catalog */
.book-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.book-item {
    background-color: var(--primary-white);
    border-radius: 10px;
    padding: 1.5rem;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border-top: 4px solid var(--primary-gold);
}

.book-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

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

.book-item .availability {
    display: flex;
    justify-content: space-between;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 2px solid var(--light-gray);
}

.book-item .available {
    color: #28a745;
    font-weight: bold;
}

.book-item .unavailable {
    color: var(--primary-red);
    font-weight: bold;
}

/* Login Page */
.login-container {
    max-width: 450px;
    margin: 5rem auto;
}

.login-card {
    background-color: var(--primary-white);
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    overflow: hidden;
}

.login-header {
    background: linear-gradient(135deg, var(--dark-red) 0%, var(--primary-red) 100%);
    color: var(--primary-white);
    padding: 2rem;
    text-align: center;
}

.login-header h2 {
    margin: 0;
    font-size: 1.8rem;
}

.login-body {
    padding: 2rem;
}

/* Action Buttons Container */
.action-buttons {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

/* Responsive Design */
@media (max-width: 768px) {
    .navbar {
        padding: 1rem;
    }
    
    .stats-container {
        grid-template-columns: 1fr;
    }
    
    .book-grid {
        grid-template-columns: 1fr;
    }
    
    .search-container {
        flex-direction: column;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .action-buttons .btn {
        width: 100%;
    }
}

/* Loading Spinner */
.spinner {
    border: 4px solid var(--light-gray);
    border-top: 4px solid var(--primary-gold);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 2rem auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 3rem;
    color: var(--medium-gray);
}

.empty-state h3 {
    color: var(--dark-gray);
    margin-bottom: 1rem;
}

/* Footer */
footer {
    background-color: var(--dark-gray);
    color: var(--primary-white);
    text-align: center;
    padding: 1.5rem;
    margin-top: 3rem;
}

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

footer a:hover {
    text-decoration: underline;
}

/* --- Book Catalog Styles --- */

/* Ensures the grid layout is responsive */
.book-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    padding: 20px 0;
}

/* Styles for each individual book item */
.book-item {
    border: 3px solid #e0e0e0; /* Default border */
    border-radius: 8px;
    padding: 15px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    transition: transform 0.2s, border-color 0.3s; /* Added border-color transition */
}

    .book-item:hover {
        transform: translateY(-3px);
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    }

/* --- Conditional Border Colors --- */

/* Class to be added to the book-item div when available */
.book-available {
/*    border-color: #28a745; /* Green border */
}

/* Class to be added to the book-item div when unavailable */
.book-unavailable {
    border-color: #dc3545; /* Red border */
}

/* --- Image Resizing and Spacing --- */

/* Container for the book cover image - Increased size */
.book-cover-container {
    width: 180px; /* Increased width */
    height: 250px; /* Increased height */
    margin-bottom: 15px; /* Increased space below image */
    overflow: hidden;
    border: 1px;
    border-radius: 4px;
}

/* Styles for the image itself */
.book-cover {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* --- Title Size Adjustment --- */

.book-item h3 {
    font-size: 1.1rem; /* Smaller title size */
    margin-top: 0;
    margin-bottom: 8px; /* Adjusted spacing */
    color: var(--dark-red);
}

/* --- Availability Spacing Fix --- */

.book-item .availability {
    margin-top: auto;
    font-size: 0.9rem;
    padding-top: 10px;
    /* Ensure elements inside have space */
    display: flex;
    flex-direction: column; /* Stack them vertically for better spacing */
    gap: 5px; /* Space between Total and Available lines */
}

.availability span {
    display: block; /* Ensures each span takes its own line */
}

.available {
    color: green;
    font-weight: bold;
}

.unavailable {
    color: red;
    font-weight: bold;
}

/* HAM BURGER MENU STYLE ADDED  */

.hamburger {
    font-size: 32px;
    background: none;
    border: none;
    color: white;
    cursor: pointer;
}

@media (max-width: 1024px) { /* Increased from 900px for better fit */
    .navbar-nav {
        display: none !important; /* Hide full nav */
    }

    .hamburger {
        display: block; /* Show hamburger only on small screens */
    }
}

#navbar-nav-links {
    display: none;
    flex-direction: column;
    gap: 0.5rem;
}

#navbar-nav-links.open {
    display: flex !important;
}

.side-menu {
    position: fixed;
    top: 0;
    right: -280px;
    width: 280px;
    height: 100vh; 
    overflow-y: auto; 
    -webkit-overflow-scrolling: touch; 
    background: linear-gradient(135deg, var(--dark-red), var(--primary-red));
    padding-top: 80px; 
    padding-bottom: 20px; 
    
    display: flex;
    flex-direction: column;
    transition: right 0.3s ease;
    z-index: 3000;
    box-shadow: -4px 0 12px rgba(0,0,0,0.35);
}

.side-menu.open {
    right: 0;
}

.side-menu a {
    flex-shrink: 0; 
    padding: 15px 25px;
    color: white;
    text-decoration: none;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.side-menu a:hover {
    background: rgba(255,255,255,0.1);
}

@media (max-width: 900px) {
    .navbar-nav {
        display: none !important;
    }
}

.navbar-nav {
    display: grid;
    grid-auto-flow: column;
    grid-template-rows: repeat(2, auto);
    grid-auto-columns: max-content; 
    gap: 6px 16px;
    align-items: center;
}

.navbar-nav a {
    padding: 4px 10px;
    font-size: 0.82rem;
    white-space: nowrap;
}

.navbar-nav {
    justify-content: flex-start;
}