/* Custom Styles for Library Management System */

:root {
    --primary-color: #2563eb;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #3b82f6;
    --light-bg: #f8fafc;
    --dark-text: #1e293b;
}

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

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #555;
}

/* Navbar Styles */
.navbar {
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
}

/* Sidebar Styles */
.sidebar {
    min-height: calc(100vh - 56px);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    box-shadow: 2px 0 5px rgba(0, 0, 0, 0.1);
}

.sidebar .nav-link {
    color: rgba(255, 255, 255, 0.8);
    padding: 12px 20px;
    margin: 5px 10px;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.sidebar .nav-link:hover,
.sidebar .nav-link.active {
    background-color: rgba(255, 255, 255, 0.2);
    color: white;
    transform: translateX(5px);
}

.sidebar .nav-link i {
    width: 20px;
    margin-right: 10px;
}

/* Card Styles */
.card {
    border: none;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

.card-header {
    background-color: transparent;
    border-bottom: 2px solid #e2e8f0;
    font-weight: 600;
}

/* Stats Card */
.stats-card {
    border-left: 4px solid var(--primary-color);
}

.stats-card.success {
    border-left-color: var(--success-color);
}

.stats-card.warning {
    border-left-color: var(--warning-color);
}

.stats-card.danger {
    border-left-color: var(--danger-color);
}

.stats-card .stats-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    font-size: 24px;
}

/* Button Styles */
.btn {
    border-radius: 8px;
    padding: 8px 20px;
    font-weight: 500;
    transition: all 0.3s ease;
}

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

.btn-primary:hover {
    background-color: #1d4ed8;
    border-color: #1d4ed8;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(37, 99, 235, 0.3);
}

/* Table Styles */
.table {
    background-color: white;
    border-radius: 12px;
    overflow: hidden;
}

.table thead {
    background-color: #f1f5f9;
}

.table thead th {
    border: none;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
    padding: 15px;
}

.table tbody tr {
    transition: background-color 0.2s ease;
}

.table tbody tr:hover {
    background-color: #f8fafc;
}

/* Badge Styles */
.badge {
    padding: 6px 12px;
    border-radius: 6px;
    font-weight: 500;
}

/* Book Card */
.book-card {
    height: 100%;
}

.book-card img {
    height: 200px;
    object-fit: cover;
    border-radius: 8px;
}

.book-card .badge {
    position: absolute;
    top: 10px;
    right: 10px;
}

/* Search Bar */
.search-bar {
    max-width: 500px;
    position: relative;
}

.search-bar input {
    border-radius: 25px;
    padding-left: 45px;
    border: 2px solid #e2e8f0;
}

.search-bar .search-icon {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: #94a3b8;
}

/* Form Styles */
.form-control,
.form-select {
    border-radius: 8px;
    border: 2px solid #e2e8f0;
    padding: 10px 15px;
}

.form-control:focus,
.form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(37, 99, 235, 0.15);
}

/* Pagination */
.pagination .page-link {
    border-radius: 8px;
    margin: 0 3px;
    border: 1px solid #e2e8f0;
    color: var(--primary-color);
}

.pagination .page-item.active .page-link {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

/* Alert Styles */
.alert {
    border-radius: 12px;
    border: none;
    padding: 15px 20px;
}

.alert i {
    margin-right: 8px;
}

/* Profile Card */
.profile-card {
    text-align: center;
}

.profile-card .profile-img {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid white;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* Loading Spinner */
.spinner-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        min-height: auto;
    }
    
    .stats-card .stats-icon {
        width: 50px;
        height: 50px;
        font-size: 20px;
    }
}

/* Animation */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.5s ease;
}

/* Custom Container */
.container-custom {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* Status Badges */
.status-available {
    background-color: #d1fae5;
    color: #065f46;
}

.status-borrowed {
    background-color: #dbeafe;
    color: #1e40af;
}

.status-overdue {
    background-color: #fee2e2;
    color: #991b1b;
}

.status-returned {
    background-color: #f3f4f6;
    color: #374151;
}