/* ============================================================
   LIBRARY PRO — MAIN STYLESHEET
   Color Palette:
   - Deep Ink:    #1a1f2e  (sidebar bg)
   - Warm Ivory:  #f8f5f0  (page bg)
   - Ink Blue:    #2d3a6b  (accent primary)
   - Amber Gold:  #c8953a  (accent warm)
   - Slate:       #5c6880  (muted text)
   - Paper White: #ffffff
============================================================ */

:root {
    --sidebar-w: 260px;
    --topbar-h: 60px;
    --deep-ink: #1a1f2e;
    --ink-blue: #2d3a6b;
    --ink-blue-light: #3d4f8f;
    --amber: #c8953a;
    --amber-light: #e8b05a;
    --ivory: #f8f5f0;
    --paper: #ffffff;
    --slate: #5c6880;
    --slate-light: #8a96aa;
    --danger: #e04a4a;
    --success: #2e9e6f;
    --warning: #d4920a;
    --info: #2873cc;
    --border: #e5e2dc;
    --shadow-sm: 0 1px 4px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.12);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.16);
    --radius: 10px;
    --radius-sm: 6px;
    --radius-lg: 16px;
    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'Inter', system-ui, sans-serif;
    --transition: all 0.22s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html, body {
    font-family: var(--font-body);
    background-color: var(--ivory);
    color: var(--deep-ink);
    font-size: 14px;
    line-height: 1.6;
    height: 100%;
}

/* ============================
   SIDEBAR
============================ */
.sidebar {
    position: fixed;
    top: 0; left: 0;
    width: var(--sidebar-w);
    height: 100vh;
    background: var(--deep-ink);
    display: flex;
    flex-direction: column;
    z-index: 1000;
    transition: var(--transition);
    overflow: hidden;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 20px 20px 18px;
    border-bottom: 1px solid rgba(255,255,255,0.07);
    min-height: var(--topbar-h);
}

.brand-icon {
    width: 38px; height: 38px;
    background: linear-gradient(135deg, var(--ink-blue-light), var(--amber));
    border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    font-size: 18px; color: #fff;
    flex-shrink: 0;
}

.brand-name {
    font-family: var(--font-display);
    font-size: 17px;
    font-weight: 700;
    color: #fff;
    display: block;
    line-height: 1.2;
}

.brand-tagline {
    font-size: 10px;
    color: var(--slate-light);
    text-transform: uppercase;
    letter-spacing: 0.8px;
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: 12px 0;
    scrollbar-width: thin;
    scrollbar-color: rgba(255,255,255,0.1) transparent;
}

.nav-section-label {
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    color: var(--slate-light);
    padding: 14px 20px 4px;
    opacity: 0.6;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 11px;
    padding: 9px 20px;
    color: rgba(255,255,255,0.65);
    text-decoration: none;
    border-radius: 0;
    font-size: 13.5px;
    font-weight: 400;
    transition: var(--transition);
    margin: 1px 10px;
    border-radius: var(--radius-sm);
    position: relative;
}

.nav-item i {
    font-size: 17px;
    width: 20px;
    flex-shrink: 0;
}

.nav-item:hover {
    color: #fff;
    background: rgba(255,255,255,0.07);
}

.nav-item.active {
    color: #fff;
    background: var(--ink-blue);
    font-weight: 500;
}

.nav-item.active::before {
    content: '';
    position: absolute;
    left: 0; top: 4px; bottom: 4px;
    width: 3px;
    background: var(--amber);
    border-radius: 0 3px 3px 0;
    margin-left: -10px;
}

.badge-pill {
    margin-left: auto;
    background: var(--danger);
    color: #fff;
    font-size: 10px;
    font-weight: 700;
    padding: 2px 6px;
    border-radius: 20px;
    min-width: 20px;
    text-align: center;
}

.sidebar-footer {
    padding: 14px;
    border-top: 1px solid rgba(255,255,255,0.07);
    display: flex;
    align-items: center;
    gap: 10px;
}

.user-card {
    display: flex;
    align-items: center;
    gap: 10px;
    flex: 1;
    text-decoration: none;
    min-width: 0;
}

.user-avatar {
    width: 34px; height: 34px;
    background: linear-gradient(135deg, var(--amber), var(--ink-blue-light));
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-weight: 700; color: #fff; font-size: 14px;
    flex-shrink: 0;
}

.user-name {
    display: block;
    color: rgba(255,255,255,0.9);
    font-size: 13px;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-role {
    display: block;
    color: var(--slate-light);
    font-size: 11px;
}

.btn-logout {
    width: 32px; height: 32px;
    display: flex; align-items: center; justify-content: center;
    color: rgba(255,255,255,0.4);
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: var(--transition);
    flex-shrink: 0;
}

.btn-logout:hover { color: var(--danger); background: rgba(224,74,74,0.12); }

/* ============================
   MAIN WRAPPER & TOPBAR
============================ */
.main-wrapper {
    margin-left: var(--sidebar-w);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
}

.topbar {
    height: var(--topbar-h);
    background: var(--paper);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 0 24px;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.sidebar-toggle {
    background: none;
    border: none;
    font-size: 22px;
    color: var(--slate);
    cursor: pointer;
    padding: 4px;
    border-radius: var(--radius-sm);
    display: none;
    transition: var(--transition);
}

.sidebar-toggle:hover { color: var(--ink-blue); background: var(--ivory); }

.topbar-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--deep-ink);
    flex: 1;
}

.topbar-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.search-box {
    position: relative;
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--ivory);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 6px 14px;
}

.search-box i { color: var(--slate); font-size: 14px; }

.search-box input {
    border: none; background: transparent; outline: none;
    font-size: 13px; width: 200px; color: var(--deep-ink);
}

.search-dropdown {
    position: absolute;
    top: calc(100% + 6px);
    left: 0; right: 0;
    background: var(--paper);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    max-height: 320px;
    overflow-y: auto;
    display: none;
    z-index: 500;
}

.search-result-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    cursor: pointer;
    border-bottom: 1px solid var(--border);
    text-decoration: none;
    color: inherit;
    transition: background 0.15s;
}

.search-result-item:hover { background: var(--ivory); }
.search-result-item:last-child { border-bottom: none; }

.search-result-cover {
    width: 36px; height: 48px;
    border-radius: 4px;
    object-fit: cover;
    background: var(--border);
    flex-shrink: 0;
}

.topbar-btn {
    width: 36px; height: 36px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 50%;
    background: var(--ivory);
    color: var(--slate);
    text-decoration: none;
    font-size: 17px;
    transition: var(--transition);
    position: relative;
}

.topbar-btn:hover { background: var(--border); color: var(--ink-blue); }

.notif-badge {
    position: absolute;
    top: 2px; right: 2px;
    background: var(--danger);
    color: #fff;
    font-size: 9px;
    font-weight: 700;
    width: 16px; height: 16px;
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    border: 2px solid var(--paper);
}

.topbar-avatar {
    width: 34px; height: 34px;
    background: linear-gradient(135deg, var(--amber), var(--ink-blue-light));
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-weight: 700; color: #fff; font-size: 13px;
    text-decoration: none;
    cursor: pointer;
}

/* ============================
   PAGE CONTENT
============================ */
.page-content {
    flex: 1;
    padding: 28px 28px;
}

/* ============================
   STAT CARDS
============================ */
.stat-card {
    background: var(--paper);
    border-radius: var(--radius-lg);
    padding: 22px 24px;
    border: 1px solid var(--border);
    display: flex;
    align-items: flex-start;
    gap: 16px;
    transition: var(--transition);
    text-decoration: none;
    color: inherit;
    position: relative;
    overflow: hidden;
}

.stat-card::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0; right: 0;
    height: 3px;
    background: var(--gradient, linear-gradient(90deg, var(--ink-blue), var(--amber)));
    transform: scaleX(0);
    transition: var(--transition);
    transform-origin: left;
}

.stat-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.stat-card:hover::after { transform: scaleX(1); }

.stat-icon {
    width: 52px; height: 52px;
    border-radius: var(--radius);
    display: flex; align-items: center; justify-content: center;
    font-size: 24px;
    flex-shrink: 0;
}

.stat-icon.blue { background: rgba(45,58,107,0.1); color: var(--ink-blue); }
.stat-icon.amber { background: rgba(200,149,58,0.12); color: var(--amber); }
.stat-icon.green { background: rgba(46,158,111,0.1); color: var(--success); }
.stat-icon.red { background: rgba(224,74,74,0.1); color: var(--danger); }
.stat-icon.purple { background: rgba(120,60,180,0.1); color: #783cb4; }
.stat-icon.teal { background: rgba(20,150,150,0.1); color: #149696; }

.stat-value {
    font-size: 28px;
    font-weight: 700;
    font-family: var(--font-display);
    color: var(--deep-ink);
    line-height: 1;
    margin-bottom: 4px;
}

.stat-label { font-size: 13px; color: var(--slate); font-weight: 500; }
.stat-sub { font-size: 11px; color: var(--slate-light); margin-top: 4px; }

/* ============================
   CARDS & PANELS
============================ */
.panel {
    background: var(--paper);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    overflow: hidden;
}

.panel-header {
    padding: 16px 22px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.panel-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--deep-ink);
    display: flex;
    align-items: center;
    gap: 8px;
}

.panel-title i { color: var(--ink-blue); }

.panel-body { padding: 22px; }

/* ============================
   TABLES
============================ */
.table-responsive { border-radius: var(--radius); overflow: hidden; }

.table { margin: 0; }
.table thead th {
    background: var(--ivory);
    color: var(--slate);
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    border-bottom: 2px solid var(--border);
    padding: 12px 16px;
    white-space: nowrap;
}

.table tbody td {
    padding: 13px 16px;
    vertical-align: middle;
    border-bottom: 1px solid var(--border);
    color: var(--deep-ink);
    font-size: 13.5px;
}

.table tbody tr:hover td { background: rgba(248,245,240,0.7); }
.table tbody tr:last-child td { border-bottom: none; }

/* ============================
   BADGES & PILLS
============================ */
.badge-status {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.badge-status::before {
    content: '';
    width: 6px; height: 6px;
    border-radius: 50%;
    background: currentColor;
    opacity: 0.8;
}

.badge-active { background: rgba(46,158,111,0.12); color: var(--success); }
.badge-borrowed { background: rgba(40,115,204,0.12); color: var(--info); }
.badge-returned { background: rgba(46,158,111,0.12); color: var(--success); }
.badge-overdue { background: rgba(224,74,74,0.12); color: var(--danger); }
.badge-suspended { background: rgba(224,74,74,0.12); color: var(--danger); }
.badge-pending { background: rgba(212,146,10,0.12); color: var(--warning); }
.badge-student { background: rgba(45,58,107,0.1); color: var(--ink-blue); }
.badge-teacher { background: rgba(120,60,180,0.1); color: #783cb4; }
.badge-outsider { background: rgba(200,149,58,0.12); color: var(--amber); }

.member-type-badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
    text-transform: capitalize;
}

/* ============================
   FORMS
============================ */
.form-label {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    color: var(--slate);
    margin-bottom: 6px;
}

.form-control, .form-select {
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 9px 13px;
    font-size: 14px;
    color: var(--deep-ink);
    background: var(--paper);
    transition: var(--transition);
}

.form-control:focus, .form-select:focus {
    border-color: var(--ink-blue);
    box-shadow: 0 0 0 3px rgba(45,58,107,0.1);
    outline: none;
}

/* ============================
   BUTTONS
============================ */
.btn {
    font-weight: 500;
    font-size: 13px;
    border-radius: var(--radius-sm);
    padding: 8px 16px;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.btn-primary {
    background: var(--ink-blue);
    border-color: var(--ink-blue);
    color: #fff;
}
.btn-primary:hover { background: var(--ink-blue-light); border-color: var(--ink-blue-light); }

.btn-amber {
    background: var(--amber);
    border-color: var(--amber);
    color: #fff;
}
.btn-amber:hover { background: var(--amber-light); border-color: var(--amber-light); }

.btn-sm { padding: 5px 11px; font-size: 12px; }
.btn-icon { padding: 6px 8px; }

/* ============================
   BOOK CARDS
============================ */
.book-card {
    background: var(--paper);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    overflow: hidden;
    transition: var(--transition);
    height: 100%;
    display: flex;
    flex-direction: column;
    cursor: pointer;
}

.book-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.book-cover {
    height: 200px;
    overflow: hidden;
    background: linear-gradient(135deg, var(--ink-blue), var(--deep-ink));
    position: relative;
    flex-shrink: 0;
}

.book-cover img {
    width: 100%; height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.book-card:hover .book-cover img { transform: scale(1.05); }

.book-cover-placeholder {
    width: 100%; height: 100%;
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    color: rgba(255,255,255,0.5);
    font-size: 40px;
}

.book-cover-placeholder span {
    font-size: 11px;
    margin-top: 8px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.book-availability {
    position: absolute;
    top: 10px; right: 10px;
    padding: 3px 9px;
    border-radius: 20px;
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
}

.book-availability.available { background: var(--success); color: #fff; }
.book-availability.unavailable { background: var(--danger); color: #fff; }

.book-info {
    padding: 14px 16px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.book-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--deep-ink);
    margin-bottom: 4px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.4;
}

.book-author {
    font-size: 12px;
    color: var(--slate);
    margin-bottom: 10px;
}

.book-meta {
    margin-top: auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding-top: 10px;
    border-top: 1px solid var(--border);
}

.book-copies {
    font-size: 12px;
    color: var(--slate);
}

.book-copies strong { color: var(--success); }
.book-copies.no-copies strong { color: var(--danger); }

/* ============================
   MEMBER CARD
============================ */
.member-card {
    background: var(--paper);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 14px;
    transition: var(--transition);
}

.member-card:hover { box-shadow: var(--shadow-md); }

.member-avatar {
    width: 48px; height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--ink-blue), var(--amber));
    display: flex; align-items: center; justify-content: center;
    font-weight: 700; color: #fff; font-size: 18px;
    flex-shrink: 0;
}

/* ============================
   PAGE HEADER
============================ */
.page-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 28px;
}

.page-header-left h1 {
    font-family: var(--font-display);
    font-size: 24px;
    font-weight: 700;
    color: var(--deep-ink);
    margin-bottom: 4px;
}

.page-header-left p {
    color: var(--slate);
    font-size: 13px;
    margin: 0;
}

/* ============================
   OVERDUE / ALERT BANNER
============================ */
.overdue-banner {
    background: linear-gradient(135deg, #e04a4a10, #e04a4a08);
    border: 1px solid rgba(224,74,74,0.2);
    border-radius: var(--radius);
    padding: 14px 18px;
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.overdue-banner i { color: var(--danger); font-size: 20px; flex-shrink: 0; }

/* ============================
   MODAL CUSTOMIZATION
============================ */
.modal-content {
    border: none;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.modal-header {
    background: var(--deep-ink);
    color: #fff;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    padding: 16px 22px;
    border-bottom: none;
}

.modal-header .btn-close { filter: invert(1); opacity: 0.7; }
.modal-header .btn-close:hover { opacity: 1; }
.modal-title { font-family: var(--font-display); font-size: 17px; font-weight: 600; }

/* ============================
   PDF VIEWER
============================ */
.pdf-viewer-container {
    width: 100%;
    height: 82vh;
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
}

.pdf-viewer-container iframe {
    width: 100%; height: 100%; border: none;
}

/* ============================
   MATERIAL CARDS
============================ */
.material-card {
    background: var(--ivory);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px 16px;
    display: flex;
    align-items: center;
    gap: 14px;
    transition: var(--transition);
}

.material-card:hover { background: var(--paper); box-shadow: var(--shadow-sm); }

.material-icon {
    width: 44px; height: 44px;
    border-radius: var(--radius-sm);
    display: flex; align-items: center; justify-content: center;
    font-size: 22px;
    flex-shrink: 0;
}

.material-icon.pdf { background: rgba(224,74,74,0.1); color: var(--danger); }
.material-icon.image { background: rgba(46,158,111,0.1); color: var(--success); }
.material-icon.video { background: rgba(45,58,107,0.1); color: var(--ink-blue); }

/* ============================
   LOGIN / AUTH PAGES
============================ */
.auth-page {
    min-height: 100vh;
    background: var(--deep-ink);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.auth-card {
    background: var(--paper);
    border-radius: var(--radius-lg);
    padding: 40px 44px;
    width: 100%;
    max-width: 440px;
    box-shadow: var(--shadow-lg);
}

.auth-logo {
    text-align: center;
    margin-bottom: 30px;
}

.auth-logo .icon {
    width: 60px; height: 60px;
    background: linear-gradient(135deg, var(--ink-blue), var(--amber));
    border-radius: var(--radius);
    display: inline-flex;
    align-items: center; justify-content: center;
    font-size: 28px; color: #fff;
    margin-bottom: 12px;
}

.auth-logo h1 {
    font-family: var(--font-display);
    font-size: 24px;
    color: var(--deep-ink);
    margin-bottom: 4px;
}

.auth-logo p { font-size: 13px; color: var(--slate); }

/* ============================
   ALERTS
============================ */
.alert {
    border-radius: var(--radius);
    border: none;
    padding: 12px 16px;
    font-size: 13.5px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.alert-success { background: rgba(46,158,111,0.1); color: var(--success); }
.alert-danger { background: rgba(224,74,74,0.1); color: var(--danger); }
.alert-warning { background: rgba(212,146,10,0.1); color: var(--warning); }
.alert-info { background: rgba(40,115,204,0.1); color: var(--info); }

/* ============================
   LOADING STATES
============================ */
.skeleton {
    background: linear-gradient(90deg, var(--border) 25%, #eee 50%, var(--border) 75%);
    background-size: 200% 100%;
    animation: skeleton-load 1.5s infinite;
    border-radius: var(--radius-sm);
}

@keyframes skeleton-load {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ============================
   DATATABLE CUSTOM
============================ */
.dataTables_wrapper .dataTables_filter input {
    border: 1.5px solid var(--border);
    border-radius: 24px;
    padding: 6px 14px;
    font-size: 13px;
    outline: none;
}

.dataTables_wrapper .dataTables_filter input:focus { border-color: var(--ink-blue); }

.dataTables_wrapper .dataTables_length select {
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 4px 8px;
}

.dataTables_wrapper .dataTables_info,
.dataTables_wrapper .dataTables_paginate {
    font-size: 12px;
    padding-top: 12px;
}

.dataTables_wrapper .paginate_button.current {
    background: var(--ink-blue) !important;
    border-color: var(--ink-blue) !important;
    color: white !important;
    border-radius: var(--radius-sm) !important;
}

.dataTables_wrapper .paginate_button:hover {
    background: var(--ivory) !important;
    border-color: var(--border) !important;
    color: var(--ink-blue) !important;
    border-radius: var(--radius-sm) !important;
}

/* ============================
   PROGRESS BAR
============================ */
.progress {
    height: 6px;
    border-radius: 10px;
    background: var(--border);
}

.progress-bar {
    border-radius: 10px;
    background: linear-gradient(90deg, var(--ink-blue), var(--amber));
}

/* ============================
   TIMELINE
============================ */
.timeline { position: relative; padding-left: 24px; }
.timeline::before {
    content: '';
    position: absolute;
    left: 7px; top: 0; bottom: 0;
    width: 2px;
    background: var(--border);
}

.timeline-item { position: relative; margin-bottom: 18px; }
.timeline-item::before {
    content: '';
    position: absolute;
    left: -21px; top: 5px;
    width: 10px; height: 10px;
    border-radius: 50%;
    background: var(--ink-blue);
    border: 2px solid var(--paper);
    box-shadow: 0 0 0 2px var(--ink-blue);
}

/* ============================
   SCROLLBAR
============================ */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: var(--slate-light); }

/* ============================
   RESPONSIVE
============================ */
@media (max-width: 991px) {
    .sidebar {
        transform: translateX(-100%);
        z-index: 2000;
    }
    .sidebar.open { transform: translateX(0); }
    .sidebar-toggle { display: flex; }
    .main-wrapper { margin-left: 0; }

    .sidebar-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0,0,0,0.5);
        z-index: 1999;
    }
    .sidebar-overlay.show { display: block; }
}

@media (max-width: 767px) {
    .page-content { padding: 18px 16px; }
    .auth-card { padding: 28px 22px; }
    .topbar { padding: 0 16px; }
    .page-header { flex-direction: column; }
}

@media (max-width: 575px) {
    .stat-card { padding: 16px 18px; }
    .stat-value { font-size: 22px; }
    .book-cover { height: 160px; }
}