:root {
    --primary: #7C3AED;
    --secondary: #06B6D4;
    --dark: #0A0E1A;
    --light: #F8F9FA;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f6fa;
}

#sidebar {
    min-width: 250px;
    max-width: 250px;
    min-height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 999;
}

#sidebar .nav-link {
    color: rgba(255, 255, 255, 0.7);
    padding: 12px 20px;
    border-radius: 8px;
    margin-bottom: 5px;
    transition: all 0.3s;
}

#sidebar .nav-link:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: white;
}

#sidebar .nav-link.active {
    background-color: var(--primary);
    color: white;
}

#content {
    margin-left: 250px;
    min-height: 100vh;
}

.card {
    border-radius: 12px;
    transition: transform 0.2s;
}

.card:hover {
    transform: translateY(-2px);
}

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

.badge {
    padding: 6px 12px;
    border-radius: 20px;
}

.login-page {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
}

.login-page .card {
    border-radius: 16px;
}

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

.btn-primary:hover {
    background-color: #6d28d9;
    border-color: #6d28d9;
}

.text-primary {
    color: var(--primary) !important;
}

.bg-primary {
    background-color: var(--primary) !important;
}

.pagination .page-link {
    color: var(--primary);
}

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

img.book-cover {
    width: 50px;
    height: 70px;
    object-fit: cover;
    border-radius: 4px;
}