/* ============================================
   ASPIRE LIBRARY MANAGEMENT SYSTEM
   Enterprise Stylesheet  –  v1.0
   ============================================ */

:root {
    /* Brand – rich navy & gold */
    --primary-50:  #EEF2FF;
    --primary-100: #E0E7FF;
    --primary-200: #C7D2FE;
    --primary-300: #A5B4FC;
    --primary-400: #818CF8;
    --primary-500: #6366F1;
    --primary-600: #4F46E5;
    --primary-700: #4338CA;
    --primary-800: #3730A3;
    --primary-900: #312E81;

    --gold-400: #FBBF24;
    --gold-500: #F59E0B;

    --success-color: #10B981;
    --success-light: #D1FAE5;
    --warning-color: #F59E0B;
    --warning-light: #FEF3C7;
    --danger-color:  #EF4444;
    --danger-light:  #FEE2E2;
    --info-color:    #3B82F6;
    --info-light:    #DBEAFE;

    --gray-50:  #F9FAFB;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    --gray-500: #6B7280;
    --gray-600: #4B5563;
    --gray-700: #374151;
    --gray-800: #1F2937;
    --gray-900: #111827;

    --text-primary:   #111827;
    --text-secondary: #4B5563;
    --text-muted:     #9CA3AF;

    --bg-page:    #F8FAFC;
    --bg-surface: #FFFFFF;
    --bg-subtle:  #F1F5F9;

    --border-color: #E5E7EB;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --border-radius-lg: 16px;

    --shadow-xs: 0 1px 2px rgba(0,0,0,.05);
    --shadow-sm: 0 1px 3px rgba(0,0,0,.1), 0 1px 2px rgba(0,0,0,.06);
    --shadow-md: 0 4px 6px rgba(0,0,0,.07), 0 2px 4px rgba(0,0,0,.06);
    --shadow-lg: 0 10px 15px rgba(0,0,0,.1),  0 4px 6px rgba(0,0,0,.05);
    --shadow-xl: 0 20px 25px rgba(0,0,0,.1),  0 10px 10px rgba(0,0,0,.04);

    --sidebar-width: 260px;
    --header-height: 64px;
    --transition: 0.2s ease;
}

/* ================================================
   Reset & Base
   ================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: var(--text-primary);
    background: var(--bg-page);
    -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, select, textarea { font-family: inherit; }
img { max-width: 100%; display: block; }

/* ================================================
   Scrollbar
   ================================================ */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--gray-100); }
::-webkit-scrollbar-thumb { background: var(--gray-300); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--gray-400); }

/* ================================================
   Layout
   ================================================ */
.app-shell {
    display: flex;
    min-height: 100vh;
}

/* ---- Sidebar ---- */
.sidebar {
    width: var(--sidebar-width);
    background: var(--primary-900);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0; left: 0; bottom: 0;
    z-index: 100;
    transition: transform var(--transition);
}
.sidebar-logo {
    padding: 24px 20px 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    border-bottom: 1px solid rgba(255,255,255,.08);
}
.sidebar-logo-icon {
    width: 38px; height: 38px;
    background: linear-gradient(135deg, var(--primary-500), var(--gold-400));
    border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    font-size: 18px;
    box-shadow: 0 4px 12px rgba(99,102,241,.4);
}
.sidebar-logo-text { color: #fff; font-weight: 700; font-size: 16px; letter-spacing: -0.3px; }
.sidebar-logo-sub  { color: rgba(255,255,255,.5); font-size: 11px; }

.sidebar-nav { flex: 1; padding: 16px 12px; overflow-y: auto; }
.nav-section-label {
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 1px;
    color: rgba(255,255,255,.35);
    text-transform: uppercase;
    padding: 12px 8px 6px;
}
.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 12px;
    border-radius: var(--border-radius-sm);
    color: rgba(255,255,255,.65);
    font-weight: 500;
    font-size: 13.5px;
    transition: background var(--transition), color var(--transition);
    cursor: pointer;
    margin-bottom: 2px;
    position: relative;
}
.nav-item:hover { background: rgba(255,255,255,.07); color: #fff; }
.nav-item.active {
    background: linear-gradient(135deg, rgba(99,102,241,.4), rgba(79,70,229,.25));
    color: #fff;
    box-shadow: inset 2px 0 0 var(--primary-400);
}
.nav-item .nav-icon { font-size: 16px; width: 20px; text-align: center; flex-shrink: 0; }
.nav-badge {
    margin-left: auto;
    background: var(--danger-color);
    color: #fff;
    font-size: 10px;
    font-weight: 700;
    padding: 1px 6px;
    border-radius: 10px;
    min-width: 18px;
    text-align: center;
}

.sidebar-user {
    padding: 16px;
    border-top: 1px solid rgba(255,255,255,.08);
    display: flex;
    align-items: center;
    gap: 10px;
}
.sidebar-avatar {
    width: 34px; height: 34px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-500), var(--gold-400));
    display: flex; align-items: center; justify-content: center;
    font-weight: 700;
    font-size: 13px;
    color: #fff;
    flex-shrink: 0;
    overflow: hidden;
}
.sidebar-avatar img { width: 100%; height: 100%; object-fit: cover; }
.sidebar-user-info .name  { color: #fff; font-weight: 600; font-size: 13px; }
.sidebar-user-info .role  { color: rgba(255,255,255,.45); font-size: 11px; text-transform: capitalize; }
.sidebar-logout {
    margin-left: auto;
    color: rgba(255,255,255,.4);
    font-size: 16px;
    padding: 4px;
    border-radius: 6px;
    transition: color var(--transition), background var(--transition);
}
.sidebar-logout:hover { color: var(--danger-color); background: rgba(239,68,68,.15); }

/* ---- Main Content ---- */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.top-bar {
    height: var(--header-height);
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    padding: 0 24px;
    gap: 16px;
    position: sticky;
    top: 0;
    z-index: 50;
    box-shadow: var(--shadow-xs);
}
.top-bar-title { font-size: 18px; font-weight: 700; color: var(--text-primary); flex: 1; }
.top-bar-subtitle { font-size: 12px; color: var(--text-muted); font-weight: 400; margin-left: 8px; }

.page-content { flex: 1; padding: 24px; }

/* ================================================
   Cards & Panels
   ================================================ */
.card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
}
.card-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 10px;
}
.card-title { font-size: 15px; font-weight: 700; color: var(--text-primary); }
.card-subtitle { font-size: 12px; color: var(--text-muted); }
.card-body { padding: 20px; }
.card-actions { margin-left: auto; display: flex; gap: 8px; }

/* ================================================
   Stats Grid
   ================================================ */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}
.stat-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 20px;
    position: relative;
    overflow: hidden;
    transition: transform var(--transition), box-shadow var(--transition);
}
.stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.stat-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
}
.stat-card.primary::before  { background: linear-gradient(90deg, var(--primary-500), var(--primary-400)); }
.stat-card.success::before  { background: linear-gradient(90deg, var(--success-color), #34D399); }
.stat-card.warning::before  { background: linear-gradient(90deg, var(--warning-color), #FCD34D); }
.stat-card.danger::before   { background: linear-gradient(90deg, var(--danger-color),  #F87171); }
.stat-card.info::before     { background: linear-gradient(90deg, var(--info-color),    #60A5FA); }

.stat-icon {
    width: 44px; height: 44px;
    border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    font-size: 20px;
    margin-bottom: 12px;
}
.stat-card.primary  .stat-icon { background: var(--primary-50);  color: var(--primary-600); }
.stat-card.success  .stat-icon { background: var(--success-light); color: var(--success-color); }
.stat-card.warning  .stat-icon { background: var(--warning-light); color: var(--warning-color); }
.stat-card.danger   .stat-icon { background: var(--danger-light);  color: var(--danger-color); }
.stat-card.info     .stat-icon { background: var(--info-light);    color: var(--info-color); }

.stat-value { font-size: 28px; font-weight: 800; color: var(--text-primary); line-height: 1; margin-bottom: 4px; }
.stat-label { font-size: 12px; color: var(--text-muted); font-weight: 500; }

/* ================================================
   Buttons
   ================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: var(--border-radius-sm);
    font-size: 13px;
    font-weight: 600;
    transition: all var(--transition);
    white-space: nowrap;
    cursor: pointer;
    border: 1px solid transparent;
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-primary   { background: var(--primary-600); color: #fff; border-color: var(--primary-600); }
.btn-primary:hover:not(:disabled)  { background: var(--primary-700); border-color: var(--primary-700); }
.btn-success   { background: var(--success-color); color: #fff; border-color: var(--success-color); }
.btn-success:hover:not(:disabled)  { background: var(--success-dark); }
.btn-danger    { background: var(--danger-color); color: #fff; border-color: var(--danger-color); }
.btn-danger:hover:not(:disabled)   { background: var(--danger-dark); }
.btn-warning   { background: var(--warning-color); color: #fff; }
.btn-warning:hover:not(:disabled)  { background: var(--warning-dark); }
.btn-secondary { background: var(--bg-surface); color: var(--text-secondary); border-color: var(--border-color); }
.btn-secondary:hover:not(:disabled){ background: var(--gray-50); border-color: var(--gray-300); }
.btn-ghost  { background: transparent; color: var(--text-secondary); }
.btn-ghost:hover:not(:disabled) { background: var(--gray-100); }
.btn-sm { padding: 5px 10px; font-size: 12px; }
.btn-lg { padding: 12px 24px; font-size: 15px; }
.btn-icon { padding: 7px; }

/* ================================================
   Forms
   ================================================ */
.form-group { margin-bottom: 16px; }
.form-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}
.form-label .required { color: var(--danger-color); margin-left: 2px; }
.form-control {
    width: 100%;
    padding: 9px 12px;
    font-size: 14px;
    border: 1.5px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    background: var(--bg-surface);
    color: var(--text-primary);
    transition: border-color var(--transition), box-shadow var(--transition);
    outline: none;
}
.form-control:focus {
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px rgba(99,102,241,.12);
}
.form-control::placeholder { color: var(--text-muted); }
textarea.form-control { resize: vertical; min-height: 80px; }
select.form-control { cursor: pointer; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-hint { font-size: 12px; color: var(--text-muted); margin-top: 4px; }
.form-error { font-size: 12px; color: var(--danger-color); margin-top: 4px; }

/* ================================================
   Search & Filters Bar
   ================================================ */
.filter-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}
.search-wrap {
    display: flex;
    align-items: center;
    background: var(--bg-surface);
    border: 1.5px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    padding: 0 12px;
    gap: 8px;
    flex: 1;
    min-width: 240px;
    transition: border-color var(--transition);
}
.search-wrap:focus-within { border-color: var(--primary-500); }
.search-wrap .search-icon { color: var(--text-muted); font-size: 15px; flex-shrink: 0; }
.search-input {
    flex: 1;
    border: none;
    outline: none;
    font-size: 14px;
    padding: 9px 0;
    background: transparent;
    color: var(--text-primary);
}
.filter-select {
    padding: 9px 12px;
    border: 1.5px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    background: var(--bg-surface);
    font-size: 13px;
    color: var(--text-primary);
    cursor: pointer;
    outline: none;
    transition: border-color var(--transition);
}
.filter-select:focus { border-color: var(--primary-500); }

/* ================================================
   Tables
   ================================================ */
.table-wrapper { overflow-x: auto; }
table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13.5px;
}
thead th {
    background: var(--gray-50);
    padding: 10px 14px;
    text-align: left;
    font-weight: 700;
    color: var(--text-secondary);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--border-color);
    white-space: nowrap;
}
tbody td {
    padding: 12px 14px;
    border-bottom: 1px solid var(--gray-100);
    color: var(--text-primary);
    vertical-align: middle;
}
tbody tr:last-child td { border-bottom: none; }
tbody tr:hover td { background: var(--gray-50); }
tbody tr.selected td { background: var(--primary-50); }

/* ================================================
   Badges / Pills
   ================================================ */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 9px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.3px;
    white-space: nowrap;
}
.badge-success  { background: var(--success-light); color: var(--success-color); }
.badge-warning  { background: var(--warning-light); color: var(--warning-color); }
.badge-danger   { background: var(--danger-light);  color: var(--danger-color); }
.badge-info     { background: var(--info-light);    color: var(--info-color); }
.badge-primary  { background: var(--primary-100);   color: var(--primary-700); }
.badge-gray     { background: var(--gray-100);      color: var(--gray-600); }

/* ================================================
   Book Cards Grid
   ================================================ */
.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px;
}
.book-card {
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: transform var(--transition), box-shadow var(--transition);
    display: flex;
    flex-direction: column;
}
.book-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }
.book-cover {
    height: 180px;
    background: linear-gradient(135deg, var(--primary-800), var(--primary-600));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 48px;
    position: relative;
    overflow: hidden;
    flex-shrink: 0;
}
.book-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.book-cover-placeholder { opacity: 0.8; }
.book-availability {
    position: absolute;
    top: 8px; right: 8px;
    padding: 3px 7px;
    border-radius: 6px;
    font-size: 10px;
    font-weight: 700;
    backdrop-filter: blur(8px);
}
.book-availability.available   { background: rgba(16,185,129,.9); color: #fff; }
.book-availability.checked_out { background: rgba(239,68,68,.9);  color: #fff; }
.book-availability.reserved    { background: rgba(245,158,11,.9); color: #fff; }

.book-body { padding: 14px; flex: 1; display: flex; flex-direction: column; gap: 6px; }
.book-title { font-size: 14px; font-weight: 700; color: var(--text-primary); line-height: 1.3; }
.book-author { font-size: 12px; color: var(--text-muted); }
.book-genre-tag {
    display: inline-flex;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 10px;
    font-weight: 600;
    color: #fff;
    width: fit-content;
}
.book-meta { display: flex; gap: 12px; margin-top: 4px; }
.book-meta-item { font-size: 11px; color: var(--text-muted); display: flex; align-items: center; gap: 3px; }
.book-stars { display: flex; gap: 2px; color: var(--gold-400); font-size: 12px; }
.book-actions { padding: 12px 14px; border-top: 1px solid var(--border-color); display: flex; gap: 8px; }

/* ================================================
   Modals
   ================================================ */
.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.45);
    backdrop-filter: blur(4px);
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    opacity: 0;
    pointer-events: none;
    transition: opacity .2s;
}
.modal-backdrop.open { opacity: 1; pointer-events: all; }
.modal {
    background: var(--bg-surface);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    width: 100%;
    max-width: 560px;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(.95) translateY(10px);
    transition: transform .2s;
}
.modal-backdrop.open .modal { transform: scale(1) translateY(0); }
.modal-lg { max-width: 800px; }
.modal-header {
    padding: 20px 24px 0;
    display: flex;
    align-items: flex-start;
    gap: 12px;
}
.modal-title { font-size: 18px; font-weight: 800; color: var(--text-primary); }
.modal-subtitle { font-size: 13px; color: var(--text-muted); margin-top: 2px; }
.modal-close {
    margin-left: auto;
    width: 30px; height: 30px;
    border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
    color: var(--text-muted);
    font-size: 18px;
    transition: background var(--transition), color var(--transition);
    cursor: pointer;
    flex-shrink: 0;
}
.modal-close:hover { background: var(--gray-100); color: var(--text-primary); }
.modal-body { padding: 20px 24px; }
.modal-footer {
    padding: 0 24px 24px;
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

/* ================================================
   Toast Notifications
   ================================================ */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 9999;
    display: flex;
    flex-direction: column-reverse;
    gap: 10px;
    pointer-events: none;
}
.toast {
    background: var(--gray-900);
    color: #fff;
    padding: 12px 16px;
    border-radius: var(--border-radius-sm);
    font-size: 13px;
    font-weight: 500;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 260px;
    max-width: 380px;
    opacity: 0;
    transform: translateX(20px);
    transition: opacity .25s, transform .25s;
    pointer-events: all;
    border-left: 3px solid var(--primary-500);
}
.toast.show { opacity: 1; transform: translateX(0); }
.toast.success { border-left-color: var(--success-color); }
.toast.error   { border-left-color: var(--danger-color); }
.toast.warning { border-left-color: var(--warning-color); }
.toast-icon { font-size: 16px; flex-shrink: 0; }
.toast-close { margin-left: auto; cursor: pointer; opacity: .6; font-size: 16px; }
.toast-close:hover { opacity: 1; }

/* ================================================
   Loading States
   ================================================ */
.loading-overlay {
    position: fixed;
    inset: 0;
    background: rgba(255,255,255,.8);
    backdrop-filter: blur(4px);
    z-index: 9000;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 16px;
}
.spinner {
    width: 40px; height: 40px;
    border: 3px solid var(--primary-100);
    border-top-color: var(--primary-600);
    border-radius: 50%;
    animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.skeleton {
    background: linear-gradient(90deg, var(--gray-100) 25%, var(--gray-200) 50%, var(--gray-100) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: 6px;
}
@keyframes shimmer { to { background-position: -200% 0; } }

/* ================================================
   Empty State
   ================================================ */
.empty-state {
    text-align: center;
    padding: 60px 24px;
    color: var(--text-muted);
}
.empty-state-icon { font-size: 48px; margin-bottom: 16px; opacity: .6; }
.empty-state-title { font-size: 18px; font-weight: 700; color: var(--text-secondary); margin-bottom: 8px; }
.empty-state-text  { font-size: 14px; max-width: 360px; margin: 0 auto 20px; }

/* ================================================
   Tabs
   ================================================ */
.tabs {
    display: flex;
    gap: 2px;
    border-bottom: 2px solid var(--border-color);
    margin-bottom: 24px;
}
.tab-btn {
    padding: 10px 18px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-muted);
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    cursor: pointer;
    transition: color var(--transition), border-color var(--transition);
    display: flex;
    align-items: center;
    gap: 6px;
}
.tab-btn:hover { color: var(--primary-600); }
.tab-btn.active { color: var(--primary-600); border-bottom-color: var(--primary-600); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ================================================
   Star Rating
   ================================================ */
.star-rating { display: flex; gap: 4px; }
.star-rating .star {
    font-size: 20px;
    color: var(--gray-300);
    cursor: pointer;
    transition: color var(--transition);
}
.star-rating .star.active,
.star-rating .star:hover,
.star-rating .star.hover { color: var(--gold-400); }

/* ================================================
   AI Panel
   ================================================ */
.ai-panel {
    background: linear-gradient(135deg, var(--primary-900) 0%, var(--primary-700) 100%);
    border-radius: var(--border-radius);
    padding: 20px;
    color: #fff;
    position: relative;
    overflow: hidden;
}
.ai-panel::before {
    content: '🤖';
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 64px;
    opacity: .08;
}
.ai-panel-title { font-size: 15px; font-weight: 700; margin-bottom: 6px; }
.ai-panel-text  { font-size: 13px; opacity: .8; line-height: 1.6; }
.ai-rec-item {
    background: rgba(255,255,255,.08);
    border-radius: 8px;
    padding: 12px;
    margin-top: 10px;
    border: 1px solid rgba(255,255,255,.1);
}
.ai-rec-title  { font-weight: 700; font-size: 13px; }
.ai-rec-author { font-size: 12px; opacity: .7; }
.ai-rec-reason { font-size: 12px; opacity: .8; margin-top: 4px; color: var(--gold-400); }

/* ================================================
   Chat Widget
   ================================================ */
.chat-btn {
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 52px; height: 52px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-600), var(--primary-500));
    color: #fff;
    font-size: 22px;
    display: flex; align-items: center; justify-content: center;
    box-shadow: 0 4px 20px rgba(99,102,241,.4);
    z-index: 190;
    transition: transform var(--transition), box-shadow var(--transition);
}
.chat-btn:hover { transform: scale(1.1); box-shadow: 0 6px 24px rgba(99,102,241,.5); }
.chat-box {
    position: fixed;
    bottom: 88px;
    right: 24px;
    width: 360px;
    height: 500px;
    background: var(--bg-surface);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 189;
    transform: scale(.92) translateY(10px);
    opacity: 0;
    pointer-events: none;
    transition: all .25s;
}
.chat-box.open { transform: scale(1) translateY(0); opacity: 1; pointer-events: all; }
.chat-header {
    padding: 14px 16px;
    background: linear-gradient(135deg, var(--primary-700), var(--primary-600));
    border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
    color: #fff;
    display: flex;
    align-items: center;
    gap: 10px;
}
.chat-header-title { font-weight: 700; font-size: 14px; }
.chat-header-sub   { font-size: 11px; opacity: .7; }
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.chat-message { display: flex; gap: 8px; }
.chat-message.user { flex-direction: row-reverse; }
.chat-bubble {
    max-width: 75%;
    padding: 10px 14px;
    border-radius: var(--border-radius-sm);
    font-size: 13px;
    line-height: 1.5;
}
.chat-message.bot  .chat-bubble { background: var(--gray-100); color: var(--text-primary); border-radius: 0 12px 12px 12px; }
.chat-message.user .chat-bubble { background: var(--primary-600); color: #fff; border-radius: 12px 0 12px 12px; }
.chat-input-area {
    padding: 12px;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 8px;
}
.chat-input {
    flex: 1;
    padding: 9px 12px;
    border: 1.5px solid var(--border-color);
    border-radius: 20px;
    font-size: 13px;
    outline: none;
    transition: border-color var(--transition);
}
.chat-input:focus { border-color: var(--primary-500); }
.chat-send {
    width: 36px; height: 36px;
    border-radius: 50%;
    background: var(--primary-600);
    color: #fff;
    display: flex; align-items: center; justify-content: center;
    font-size: 15px;
    cursor: pointer;
    transition: background var(--transition);
    flex-shrink: 0;
}
.chat-send:hover { background: var(--primary-700); }

/* ================================================
   Risk Indicator
   ================================================ */
.risk-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 8px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 700;
}
.risk-badge.high   { background: var(--danger-light);  color: var(--danger-color); }
.risk-badge.medium { background: var(--warning-light); color: var(--warning-color); }
.risk-badge.low    { background: var(--success-light); color: var(--success-color); }

/* ================================================
   Overdue alert pulse
   ================================================ */
@keyframes pulse-ring {
    0%   { box-shadow: 0 0 0 0 rgba(239,68,68,.4); }
    70%  { box-shadow: 0 0 0 8px rgba(239,68,68,0); }
    100% { box-shadow: 0 0 0 0 rgba(239,68,68,0); }
}
.overdue-pulse { animation: pulse-ring 2s infinite; }

/* ================================================
   Login Page
   ================================================ */
.login-page {
    min-height: 100vh;
    background: linear-gradient(135deg, var(--primary-900) 0%, var(--primary-700) 50%, var(--primary-800) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    position: relative;
    overflow: hidden;
}
.login-bg-circles .circle {
    position: absolute;
    border-radius: 50%;
    opacity: .06;
    background: #fff;
}
.login-card {
    background: var(--bg-surface);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 25px 60px rgba(0,0,0,.3);
    width: 100%;
    max-width: 440px;
    padding: 40px;
}
.login-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 28px;
}
.login-logo-icon {
    width: 52px; height: 52px;
    background: linear-gradient(135deg, var(--primary-600), var(--gold-400));
    border-radius: 14px;
    display: flex; align-items: center; justify-content: center;
    font-size: 24px;
    box-shadow: 0 8px 20px rgba(99,102,241,.3);
}
.login-logo-text h1 { font-size: 22px; font-weight: 800; color: var(--text-primary); }
.login-logo-text p  { font-size: 12px; color: var(--text-muted); }
.login-divider {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 20px 0;
    color: var(--text-muted);
    font-size: 12px;
}
.login-divider::before,
.login-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-color);
}
.sso-btn {
    width: 100%;
    padding: 11px;
    border: 1.5px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    background: var(--bg-surface);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    transition: border-color var(--transition), background var(--transition);
}
.sso-btn:hover { border-color: var(--primary-400); background: var(--primary-50); }
.demo-credentials {
    background: var(--info-light);
    border: 1px solid var(--info-color);
    border-radius: var(--border-radius-sm);
    padding: 12px;
    margin-top: 16px;
    font-size: 12px;
    color: var(--text-secondary);
}
.demo-credentials strong { color: var(--info-color); }
.demo-cred-item { margin: 4px 0; font-family: monospace; }

/* ================================================
   View Toggle (Grid / List)
   ================================================ */
.view-toggle {
    display: flex;
    border: 1.5px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    overflow: hidden;
}
.view-toggle-btn {
    padding: 7px 10px;
    font-size: 15px;
    color: var(--text-muted);
    background: var(--bg-surface);
    transition: background var(--transition), color var(--transition);
    cursor: pointer;
    border: none;
}
.view-toggle-btn.active { background: var(--primary-600); color: #fff; }

/* ================================================
   Pagination
   ================================================ */
.pagination {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-top: 20px;
    justify-content: center;
}
.page-btn {
    width: 32px; height: 32px;
    border-radius: 6px;
    display: flex; align-items: center; justify-content: center;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    border: 1px solid var(--border-color);
    background: var(--bg-surface);
    color: var(--text-secondary);
    transition: all var(--transition);
}
.page-btn:hover:not(.active) { border-color: var(--primary-400); color: var(--primary-600); }
.page-btn.active { background: var(--primary-600); color: #fff; border-color: var(--primary-600); }

/* ================================================
   Utility classes
   ================================================ */
.text-muted    { color: var(--text-muted); }
.text-danger   { color: var(--danger-color); }
.text-success  { color: var(--success-color); }
.text-warning  { color: var(--warning-color); }
.text-center   { text-align: center; }
.font-bold     { font-weight: 700; }
.flex          { display: flex; }
.flex-center   { display: flex; align-items: center; justify-content: center; }
.gap-2         { gap: 8px; }
.gap-3         { gap: 12px; }
.mt-1          { margin-top: 6px; }
.mt-2          { margin-top: 12px; }
.mt-3          { margin-top: 20px; }
.mb-2          { margin-bottom: 12px; }
.mb-3          { margin-bottom: 20px; }
.hidden        { display: none !important; }
.role-admin    .admin-only  { display: inherit; }
.role-librarian .admin-only { display: none !important; }
.role-member    .admin-only { display: none !important; }
.role-admin    .staff-only  { display: inherit; }
.role-librarian .staff-only { display: inherit; }
.role-member    .staff-only { display: none !important; }

/* ================================================
   Responsive
   ================================================ */
@media (max-width: 1024px) {
    .books-grid { grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); }
    .form-row { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
    :root { --sidebar-width: 0px; }
    .sidebar { transform: translateX(-260px); width: 260px; }
    .sidebar.open { transform: translateX(0); }
    .main-content { margin-left: 0; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .chat-box { width: calc(100vw - 48px); right: 24px; }
}