/* Modern Library Management System - Custom Styles */
/* Aesthetic: Sophisticated library meets modern digital interface */

@import url('https://fonts.googleapis.com/css2?family=Crimson+Pro:wght@300;400;600;700&family=Libre+Baskerville:wght@400;700&family=Montserrat:wght@400;500;600;700&display=swap');

:root {
    /* Library-inspired Color Palette */
    --primary-burgundy: #8B2635;
    --primary-burgundy-dark: #6B1827;
    --primary-burgundy-light: #A73B4A;
    --secondary-gold: #D4AF37;
    --secondary-gold-dark: #B4941F;
    --cream: #F5F1E8;
    --warm-white: #FDFBF7;
    --charcoal: #2C2C2C;
    --slate: #4A4A4A;
    --light-gray: #E8E4DB;
    --sage: #8B9D83;
    --terracotta: #D47B5F;
    
    /* Semantic Colors */
    --success: #6B9D83;
    --warning: #E8A547;
    --danger: #C9505C;
    --info: #5B8BA8;
    
    /* Typography */
    --font-display: 'Libre Baskerville', serif;
    --font-body: 'Crimson Pro', serif;
    --font-ui: 'Montserrat', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Effects */
    --shadow-sm: 0 2px 8px rgba(139, 38, 53, 0.08);
    --shadow-md: 0 4px 16px rgba(139, 38, 53, 0.12);
    --shadow-lg: 0 8px 32px rgba(139, 38, 53, 0.16);
    --shadow-hover: 0 12px 40px rgba(139, 38, 53, 0.2);
    
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* Global Resets and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-body);
    background: linear-gradient(135deg, var(--warm-white) 0%, var(--cream) 100%);
    color: var(--charcoal);
    line-height: 1.7;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Elegant Background Pattern */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        repeating-linear-gradient(90deg, transparent, transparent 2px, rgba(139, 38, 53, 0.02) 2px, rgba(139, 38, 53, 0.02) 4px),
        repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(139, 38, 53, 0.02) 2px, rgba(139, 38, 53, 0.02) 4px);
    pointer-events: none;
    z-index: 0;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-burgundy);
}

h1 { font-size: 2.5rem; letter-spacing: -0.02em; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }

p {
    margin-bottom: var(--spacing-sm);
    font-size: 1.05rem;
}

/* Navigation */
.navbar {
    background: linear-gradient(135deg, var(--primary-burgundy) 0%, var(--primary-burgundy-dark) 100%);
    padding: 0;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 3px solid var(--secondary-gold);
}

.navbar-brand {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--warm-white) !important;
    padding: 1.2rem 1.5rem;
    letter-spacing: 0.03em;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: var(--transition-smooth);
}

.navbar-brand::before {
    content: '📚';
    font-size: 1.8rem;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-5px); }
}

.navbar-brand:hover {
    color: var(--secondary-gold) !important;
    transform: scale(1.02);
}

.navbar-nav .nav-link {
    font-family: var(--font-ui);
    font-weight: 500;
    color: rgba(255, 255, 255, 0.9) !important;
    padding: 1.2rem 1.5rem !important;
    transition: var(--transition-smooth);
    position: relative;
    font-size: 0.95rem;
    letter-spacing: 0.03em;
}

.navbar-nav .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 3px;
    background: var(--secondary-gold);
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.navbar-nav .nav-link:hover {
    color: var(--secondary-gold) !important;
    background: rgba(255, 255, 255, 0.05);
}

.navbar-nav .nav-link:hover::after {
    width: 80%;
}

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

/* Cards */
.card {
    border: none;
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    background: var(--warm-white);
    overflow: hidden;
    transition: var(--transition-smooth);
    position: relative;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-burgundy), var(--secondary-gold));
    opacity: 0;
    transition: var(--transition-smooth);
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-hover);
}

.card:hover::before {
    opacity: 1;
}

.card-header {
    background: linear-gradient(135deg, var(--primary-burgundy) 0%, var(--primary-burgundy-light) 100%);
    color: var(--warm-white);
    font-family: var(--font-display);
    font-weight: 600;
    padding: 1.25rem 1.5rem;
    border-bottom: 2px solid var(--secondary-gold);
    font-size: 1.25rem;
}

.card-body {
    padding: 1.75rem;
}

/* Stat Cards */
.stat-card {
    background: var(--warm-white);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
    transition: var(--transition-smooth);
}

.stat-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(139, 38, 53, 0.05) 0%, transparent 70%);
    transition: var(--transition-smooth);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.stat-card:hover::before {
    transform: scale(1.2);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    margin-bottom: 1rem;
    position: relative;
    z-index: 1;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    font-family: var(--font-display);
    color: var(--primary-burgundy);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-family: var(--font-ui);
    font-size: 0.95rem;
    color: var(--slate);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Buttons */
.btn {
    font-family: var(--font-ui);
    font-weight: 600;
    padding: 0.75rem 2rem;
    border-radius: 8px;
    border: none;
    transition: var(--transition-smooth);
    letter-spacing: 0.03em;
    font-size: 0.95rem;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

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

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-burgundy-dark) 0%, var(--primary-burgundy) 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

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

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

.btn-outline-primary {
    border: 2px solid var(--primary-burgundy);
    color: var(--primary-burgundy);
    background: transparent;
}

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

/* Forms */
.form-control, .form-select {
    border: 2px solid var(--light-gray);
    border-radius: 8px;
    padding: 0.75rem 1rem;
    font-family: var(--font-body);
    font-size: 1rem;
    transition: var(--transition-smooth);
    background: var(--warm-white);
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-burgundy);
    box-shadow: 0 0 0 0.25rem rgba(139, 38, 53, 0.1);
    outline: none;
}

.form-label {
    font-family: var(--font-ui);
    font-weight: 600;
    color: var(--charcoal);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    letter-spacing: 0.02em;
}

/* Tables */
.table {
    background: var(--warm-white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.table thead th {
    background: linear-gradient(135deg, var(--primary-burgundy) 0%, var(--primary-burgundy-light) 100%);
    color: var(--warm-white);
    font-family: var(--font-ui);
    font-weight: 600;
    border: none;
    padding: 1rem 1.25rem;
    font-size: 0.9rem;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.table tbody tr {
    transition: var(--transition-smooth);
    border-bottom: 1px solid var(--light-gray);
}

.table tbody tr:hover {
    background: rgba(139, 38, 53, 0.03);
    transform: scale(1.01);
}

.table tbody td {
    padding: 1rem 1.25rem;
    vertical-align: middle;
    font-family: var(--font-body);
}

/* Badges */
.badge {
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-family: var(--font-ui);
    font-weight: 600;
    font-size: 0.8rem;
    letter-spacing: 0.03em;
}

/* Modals */
.modal-content {
    border: none;
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.modal-header {
    background: linear-gradient(135deg, var(--primary-burgundy) 0%, var(--primary-burgundy-light) 100%);
    color: var(--warm-white);
    border: none;
    padding: 1.5rem 2rem;
}

.modal-title {
    font-family: var(--font-display);
    font-weight: 700;
}

.modal-body {
    padding: 2rem;
    background: var(--warm-white);
}

/* Search Bar */
.search-wrapper {
    position: relative;
}

.search-wrapper input {
    padding-left: 3rem;
    border-radius: 25px;
    border: 2px solid var(--light-gray);
}

.search-wrapper i {
    position: absolute;
    left: 1.25rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--slate);
}

/* Sidebar */
.sidebar {
    background: linear-gradient(180deg, var(--warm-white) 0%, var(--cream) 100%);
    min-height: 100vh;
    padding: 2rem 1rem;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 76px;
}

.sidebar-link {
    display: flex;
    align-items: center;
    padding: 1rem 1.25rem;
    color: var(--charcoal);
    text-decoration: none;
    border-radius: 10px;
    margin-bottom: 0.5rem;
    font-family: var(--font-ui);
    font-weight: 500;
    transition: var(--transition-smooth);
    position: relative;
}

.sidebar-link i {
    margin-right: 0.75rem;
    font-size: 1.2rem;
    width: 24px;
    text-align: center;
}

.sidebar-link:hover {
    background: rgba(139, 38, 53, 0.08);
    color: var(--primary-burgundy);
    transform: translateX(5px);
}

.sidebar-link.active {
    background: linear-gradient(135deg, var(--primary-burgundy) 0%, var(--primary-burgundy-light) 100%);
    color: white;
    box-shadow: var(--shadow-sm);
}

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

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.slide-in-right {
    animation: slideInRight 0.6s ease-out;
}

/* Loading Spinner */
.spinner-border-custom {
    border-color: var(--primary-burgundy);
    border-right-color: transparent;
}

/* Alert */
.alert {
    border: none;
    border-radius: 12px;
    padding: 1rem 1.5rem;
    font-family: var(--font-body);
    box-shadow: var(--shadow-sm);
}

.alert-success {
    background: rgba(107, 157, 131, 0.1);
    color: var(--success);
    border-left: 4px solid var(--success);
}

.alert-danger {
    background: rgba(201, 80, 92, 0.1);
    color: var(--danger);
    border-left: 4px solid var(--danger);
}

.alert-warning {
    background: rgba(232, 165, 71, 0.1);
    color: var(--warning);
    border-left: 4px solid var(--warning);
}

/* Pagination */
.pagination {
    gap: 0.5rem;
}

.page-link {
    border: 2px solid var(--light-gray);
    color: var(--primary-burgundy);
    border-radius: 8px;
    padding: 0.5rem 1rem;
    font-weight: 600;
    transition: var(--transition-smooth);
}

.page-link:hover {
    background: var(--primary-burgundy);
    border-color: var(--primary-burgundy);
    color: white;
}

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

/* Responsive */
@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    
    .navbar-brand {
        font-size: 1.25rem;
        padding: 1rem;
    }
    
    .stat-card {
        margin-bottom: 1rem;
    }
    
    .card-body {
        padding: 1.25rem;
    }
}

/* Utility Classes */
.text-primary-burgundy { color: var(--primary-burgundy) !important; }
.text-gold { color: var(--secondary-gold) !important; }
.bg-cream { background-color: var(--cream) !important; }
.bg-warm-white { background-color: var(--warm-white) !important; }