/* ==================== RESET & BASE ==================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: 'Inter', sans-serif;
    background: #f5f7f8;
    color: #1e293b;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, select, textarea { font-family: inherit; font-size: inherit; }

/* Global select styling */
select {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748b' d='M2.5 4.5L6 8l3.5-3.5'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right .75rem center;
    background-size: 12px;
    padding-right: 2rem !important;
    cursor: pointer;
}
table { border-collapse: collapse; }

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: #94a3b8; }

/* ==================== COLORS ==================== */
:root {
    --primary: #3d84f5;
    --primary-dark: #1a63d9;
    --primary-light: #e8f0fe;
    --bg: #f5f7f8;
    --surface: #ffffff;
    --border: #e2e8f0;
    --text: #1e293b;
    --text-secondary: #64748b;
    --success: #059669;
    --success-bg: #ecfdf5;
    --warning: #d97706;
    --warning-bg: #fffbeb;
    --danger: #dc2626;
    --danger-bg: #fef2f2;
    --info-bg: #eff6ff;
    --shadow: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,.07), 0 2px 4px -2px rgba(0,0,0,.05);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,.08), 0 4px 6px -4px rgba(0,0,0,.04);
    --radius: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
}

/* ==================== LOGIN PAGE ==================== */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    padding: 1rem;
}
.login-card {
    background: var(--surface);
    border-radius: 1rem;
    box-shadow: var(--shadow-lg);
    padding: 2.5rem;
    width: 100%;
    max-width: 420px;
    text-align: center;
}
.login-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px; height: 64px;
    background: var(--primary);
    border-radius: var(--radius-xl);
    margin-bottom: 1rem;
}
.login-card h2 { font-size: 1.5rem; font-weight: 900; color: var(--text); margin-bottom: .25rem; }
.login-subtitle { color: var(--text-secondary); font-size: .875rem; margin-bottom: 1.5rem; }
.login-card form { text-align: left; }
.login-card .form-group { margin-bottom: 1rem; }
.login-card .form-group label {
    display: block;
    font-size: .8125rem;
    font-weight: 600;
    color: #374151;
    margin-bottom: .375rem;
}
.login-card .form-group input {
    width: 100%;
    padding: .625rem .75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    font-size: .875rem;
    background: var(--surface);
    color: var(--text);
    transition: border .15s, box-shadow .15s;
}
.login-card .form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(61,132,245,.15);
}
.login-card .form-group input::placeholder { color: #9ca3af; }
.login-error {
    display: none;
    color: var(--danger);
    font-size: .875rem;
    padding: .5rem .75rem;
    background: var(--danger-bg);
    border-radius: var(--radius);
    margin-bottom: .5rem;
    text-align: left;
}
.login-error.show { display: block; }
.login-footer { font-size: .75rem; color: var(--text-secondary); text-align: center; margin-top: 1.25rem; }

/* ==================== LAYOUT ==================== */
.app-layout { display: flex; min-height: 100vh; }
.app-layout.hidden { display: none; }

/* Sidebar */
.sidebar {
    width: 260px;
    flex-shrink: 0;
    background: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0; left: 0; bottom: 0;
    z-index: 30;
    transition: width .3s ease;
    overflow: hidden;
}
.sidebar.collapsed { width: 64px; }
.sidebar.collapsed .brand-name,
.sidebar.collapsed .brand-sub,
.sidebar.collapsed .nav-section,
.sidebar.collapsed .nav-item span:not(.material-symbols-outlined),
.sidebar.collapsed .sidebar-user-info {
    display: none;
}
.sidebar.collapsed .sidebar-brand { justify-content: center; padding: 1.25rem .5rem; }
.sidebar.collapsed .nav-item { justify-content: center; padding: .625rem; }
.sidebar.collapsed .sidebar-user { justify-content: center; padding: .75rem .5rem; }
.sidebar.collapsed .sidebar-user .btn-icon { display: none; }
.sidebar-brand {
    padding: 1.25rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: .75rem;
}
.brand-logo {
    width: 40px; height: 40px;
    background: var(--primary);
    border-radius: var(--radius-lg);
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
}
.brand-name { font-size: .9375rem; font-weight: 700; color: var(--text); line-height: 1.2; margin: 0; }
.brand-sub { font-size: .75rem; color: var(--text-secondary); }

.sidebar-nav { flex: 1; overflow-y: auto; padding: 1rem .75rem; display: flex; flex-direction: column; gap: .25rem; }
.nav-section {
    font-size: .6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .05em;
    color: var(--text-secondary);
    padding: .5rem .75rem .25rem;
}
.nav-item {
    display: flex;
    align-items: center;
    gap: .75rem;
    padding: .625rem .75rem;
    border-radius: var(--radius-lg);
    font-size: .875rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all .15s ease;
    cursor: pointer;
}
.nav-item:hover { background: #f1f5f9; color: var(--text); }
.nav-item.active { background: var(--primary-light); color: var(--primary); font-weight: 600; }
.nav-item .material-symbols-outlined { font-size: 1.375rem; }

.sidebar-user {
    display: flex;
    align-items: center;
    gap: .75rem;
    padding: .75rem;
    border-top: 1px solid var(--border);
}
.sidebar-avatar {
    width: 32px; height: 32px;
    border-radius: 50%;
    background: var(--primary-light);
    color: var(--primary);
    display: flex; align-items: center; justify-content: center;
    font-size: .75rem; font-weight: 700;
}
.sidebar-user-name { font-size: .8125rem; font-weight: 600; color: var(--text); }
.sidebar-user-role { font-size: .6875rem; color: var(--text-secondary); }

.sidebar-user .btn-icon { margin-left: auto; }
.sidebar-user .btn-icon:hover { color: var(--danger); background: var(--danger-bg); }

.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.5);
    z-index: 20;
}

/* Main */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    margin-left: 260px;
    min-height: 100vh;
    min-width: 0;
    overflow-x: hidden;
    transition: margin-left .3s ease;
}
.main-content.collapsed { margin-left: 64px; }

/* Header */
.header {
    position: sticky;
    top: 0;
    z-index: 10;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 0 1.5rem;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.header-left { display: flex; align-items: center; gap: 1rem; }
.header-left h2 { font-size: 1.125rem; font-weight: 700; color: var(--text); }
.mobile-menu { color: var(--text-secondary); padding: .25rem; }
.header-right { display: flex; align-items: center; gap: 1rem; position: relative; }
.notif-btn { position: relative; color: var(--text-secondary); padding: .25rem; }
.notif-badge {
    position: absolute;
    top: -2px; right: -2px;
    width: 18px; height: 18px;
    border-radius: 50%;
    background: var(--danger);
    color: white;
    font-size: .625rem;
    font-weight: 700;
    display: flex; align-items: center; justify-content: center;
    border: 2px solid white;
}
.notif-badge.hidden { display: none; }
.header-avatar {
    width: 32px; height: 32px;
    border-radius: 50%;
    background: var(--primary-light);
    color: var(--primary);
    display: flex; align-items: center; justify-content: center;
    font-size: .75rem; font-weight: 700;
}

/* Notification dropdown */
.notif-dropdown {
    display: none;
    position: absolute;
    right: 0;
    top: 40px;
    width: 320px;
    background: var(--surface);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
    z-index: 50;
    overflow: hidden;
}
.notif-dropdown.show { display: block; }
.notif-header { padding: 1rem; border-bottom: 1px solid var(--border); font-weight: 700; font-size: .875rem; }
.notif-item {
    display: flex;
    align-items: flex-start;
    gap: .75rem;
    padding: .75rem 1rem;
    border-bottom: 1px solid #f8fafc;
    font-size: .8125rem;
}
.notif-item:hover { background: #f8fafc; }
.notif-empty { text-align: center; padding: 1.5rem; color: var(--text-secondary); font-size: .875rem; }

/* ==================== PAGES ==================== */
.pages-container { flex: 1; padding: 1.5rem; max-width: 1400px; margin: 0 auto; width: 100%; min-width: 0; overflow-x: hidden; }
.page { display: none; }
.page.active { display: block; }

/* Footer */
.app-footer {
    border-top: 1px solid var(--border);
    padding: 1rem;
    text-align: center;
    font-size: .8125rem;
    color: var(--text-secondary);
}

/* ==================== COMMON COMPONENTS ==================== */

/* Cards / Section cards */
.section-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow);
    padding: 1.25rem;
    margin-bottom: 1rem;
    min-width: 0;
    overflow: hidden;
}
.section-title {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 1rem;
    padding-bottom: .75rem;
    border-bottom: 1px solid var(--border);
}

/* Stat cards */
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; margin-bottom: 1.5rem; }
.stat-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 1.25rem;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 1rem;
}
.stat-icon {
    width: 48px; height: 48px;
    border-radius: var(--radius-lg);
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
}
.stat-icon .material-symbols-outlined { font-size: 1.5rem; }
.stat-card.blue .stat-icon { background: #dbeafe; color: var(--primary); }
.stat-card.green .stat-icon { background: #d1fae5; color: var(--success); }
.stat-card.orange .stat-icon { background: #ffedd5; color: var(--warning); }
.stat-card.purple .stat-icon { background: #ede9fe; color: #7c3aed; }
.stat-info { flex: 1; }
.stat-label { font-size: .8125rem; font-weight: 500; color: var(--text-secondary); margin: 0; }
.stat-info h3 { font-size: 1.5rem; font-weight: 700; color: var(--text); margin: .125rem 0 0; }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .375rem;
    padding: .5rem 1.25rem;
    border-radius: var(--radius-lg);
    font-size: .875rem;
    font-weight: 600;
    transition: all .15s ease;
    white-space: nowrap;
}
.btn-primary { background: var(--primary); color: white; box-shadow: var(--shadow); }
.btn-primary:hover { background: var(--primary-dark); box-shadow: var(--shadow-md); }
.btn-success { background: var(--success); color: white; box-shadow: var(--shadow); }
.btn-success:hover { background: #047857; }
.btn-dark { background: #1e293b; color: white; }
.btn-dark:hover { background: #0f172a; }
.btn-outline { border: 1px solid var(--border); background: var(--surface); color: var(--text); }
.btn-outline:hover { background: #f8fafc; }
.btn-sm { padding: .375rem .75rem; font-size: .8125rem; }
.btn-icon {
    width: 32px; height: 32px;
    padding: 0;
    border-radius: var(--radius);
    color: var(--text-secondary);
    transition: all .15s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}
.btn-icon:hover { background: #f1f5f9; color: var(--primary); }
.btn-icon.danger:hover { color: var(--danger); background: var(--danger-bg); }

/* Forms */
.form-group { display: flex; flex-direction: column; gap: .375rem; margin-bottom: 1rem; }
.form-group label { font-size: .8125rem; font-weight: 600; color: #374151; }
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: .625rem .75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    font-size: .875rem;
    background: var(--surface);
    color: var(--text);
    transition: border .15s, box-shadow .15s;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(61,132,245,.15);
}
.form-group input::placeholder { color: #9ca3af; }
.form-group input:disabled { background: #f1f5f9; color: var(--text-secondary); cursor: not-allowed; }

/* Search box */
.search-box {
    display: flex;
    align-items: center;
    gap: .5rem;
    padding: .5rem .75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    background: var(--surface);
}
.search-box input {
    border: none;
    outline: none;
    font-size: .875rem;
    background: transparent;
    color: var(--text);
    min-width: 150px;
}
.search-box input::placeholder { color: #9ca3af; }

/* Page toolbar */
.page-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1rem;
}
.toolbar-left { display: flex; align-items: center; gap: .75rem; flex-wrap: wrap; }
.toolbar-left select {
    padding: .5rem .75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    font-size: .875rem;
    background: var(--surface);
    color: var(--text);
}
.toolbar-left select:focus { outline: none; border-color: var(--primary); }

/* Tables */
.table-wrap { overflow-x: auto; }
.data-table { width: 100%; text-align: left; font-size: .875rem; }
.data-table thead { background: #f8fafc; }
.data-table thead th {
    padding: .875rem 1.5rem;
    font-size: .6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: .05em;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border);
}
.data-table tbody tr { border-bottom: 1px solid var(--border); transition: background .15s; }
.data-table tbody tr:hover { background: #f8fafc; }
.data-table tbody td { padding: .875rem 1.5rem; }
.data-table .text-right { text-align: right; }
.data-table .text-center { text-align: center; }
.data-table .font-mono { font-family: ui-monospace, monospace; font-size: .8125rem; color: var(--text-secondary); }
.data-table .font-medium { font-weight: 500; color: var(--text); }
.data-table .cell-name { font-weight: 600; color: var(--text); }
.data-table .cell-sub { font-size: .75rem; color: var(--text-secondary); margin-top: .125rem; }
.table-empty { text-align: center; padding: 3rem 1rem; color: var(--text-secondary); }
.table-actions { display: flex; align-items: center; justify-content: flex-end; gap: .25rem; }

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    gap: .375rem;
    padding: .25rem .625rem;
    border-radius: 9999px;
    font-size: .75rem;
    font-weight: 600;
}
.badge-dot { width: 6px; height: 6px; border-radius: 50%; }
.badge-green { background: #ecfdf5; color: #065f46; }
.badge-green .badge-dot { background: #10b981; }
.badge-blue { background: #eff6ff; color: #1e40af; }
.badge-blue .badge-dot { background: #3b82f6; }
.badge-orange { background: #fffbeb; color: #92400e; }
.badge-orange .badge-dot { background: #f59e0b; }
.badge-red { background: #fef2f2; color: #991b1b; }
.badge-red .badge-dot { background: #ef4444; }
.badge-purple { background: #f5f3ff; color: #5b21b6; }
.badge-purple .badge-dot { background: #8b5cf6; }
.badge-gray { background: #f1f5f9; color: #475569; }

/* Tabs */
.tabs { display: flex; border-bottom: 1px solid var(--border); }
.tab-btn {
    flex: 1;
    padding: 1rem;
    text-align: center;
    font-size: .875rem;
    font-weight: 700;
    color: var(--text-secondary);
    border-bottom: 2px solid transparent;
    transition: all .2s;
}
.tab-btn:hover { background: #f8fafc; }
.tab-btn.active { color: var(--primary); border-bottom-color: var(--primary); background: var(--primary-light); }

/* Modal */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,.6);
    z-index: 900;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    backdrop-filter: blur(3px);
}
.modal-overlay.show { display: flex; }
.modal {
    background: var(--surface);
    border-radius: 1rem;
    box-shadow: 0 25px 50px -12px rgba(0,0,0,.35);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    animation: modalSlideIn .2s ease;
}
@keyframes modalSlideIn {
    from { opacity: 0; transform: translateY(-16px) scale(.97); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}
.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border);
}
.modal-header h3 { font-size: 1.05rem; font-weight: 700; }
.modal-close { color: var(--text-secondary); padding: .25rem; transition: color .15s; }
.modal-close:hover { color: var(--text); }
.modal-body { padding: 1.5rem; }
.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: .75rem;
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border);
}

.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.form-grid .full { grid-column: 1 / -1; }
.form-row { display: flex; flex-direction: column; gap: 1rem; }

/* ==================== DASHBOARD SPECIFICS ==================== */
.overdue-warnings {
    background: #fffbeb;
    border: 1px solid #fed7aa;
    border-radius: var(--radius-xl);
    padding: 1rem 1.25rem;
    margin-bottom: 1.5rem;
}
.overdue-list { display: flex; flex-direction: column; gap: .5rem; }

/* ==================== OVERDUE ITEMS ==================== */

.overdue-item {
    display: flex;
    align-items: center;
    gap: .75rem;
    padding: .625rem;
    background: #fff7ed;
    border: 1px solid #fed7aa;
    border-radius: var(--radius-lg);
    font-size: .8125rem;
}
.overdue-item strong { color: var(--text); }
.overdue-item .days { color: var(--danger); font-weight: 600; }

/* ==================== TRANSACTIONS ==================== */
.trans-form-row {
    display: flex;
    gap: 1rem;
    align-items: flex-end;
    flex-wrap: wrap;
}
.trans-form-row .form-group { flex: 1; min-width: 180px; margin-bottom: 0; }
.trans-form-row .trans-form-action { flex: none; }
.trans-form-row .trans-form-action .btn { white-space: nowrap; }
.return-info {
    display: flex;
    gap: 1.5rem;
    align-items: center;
    padding: .75rem 1rem;
    background: #f8fafc;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
}
.return-row { display: flex; align-items: center; gap: .5rem; font-size: .875rem; }
.trans-tabs { display: flex; border-bottom: 1px solid var(--border); margin: -1.25rem -1.25rem 1.25rem; }
.trans-tabs .tab-btn { flex: 1; padding: .875rem; }
.trans-form { display: flex; flex-direction: column; gap: 0; }
.trans-form .form-group { margin-bottom: .75rem; }
.return-info-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-bottom: 1rem; }
.return-info-box {
    padding: 1rem;
    background: #f8fafc;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
}
.return-info-box .label { font-size: .8125rem; font-weight: 600; color: var(--text-secondary); }
.return-info-box .value { font-size: 1.5rem; font-weight: 700; margin-top: .25rem; }

/* ==================== REPORTS ==================== */
.chart-bar-wrapper { display: flex; align-items: stretch; justify-content: space-between; gap: .75rem; height: 220px; padding-bottom: 2rem; position: relative; }
.chart-bar-col { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: flex-end; position: relative; }
.chart-bar {
    width: 100%;
    max-width: 80px;
    border-radius: .375rem .375rem 0 0;
    transition: all .3s;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: .5rem;
    cursor: pointer;
    min-height: 24px;
}
.chart-bar:hover { opacity: .8; }
.chart-bar-label { font-size: .75rem; font-weight: 600; color: var(--text-secondary); text-align: center; margin-top: .5rem; position: absolute; bottom: -1.75rem; left: 0; right: 0; }
.chart-bar-value { font-size: .75rem; font-weight: 700; }

.top-book-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    border-bottom: 1px solid #f8fafc;
    transition: background .15s;
}
.top-book-item:last-child { border-bottom: none; }
.top-book-item:hover { background: #f8fafc; }
.top-book-rank { font-weight: 700; color: var(--text-secondary); width: 24px; text-align: center; }
.top-book-icon {
    width: 40px; height: 40px;
    border-radius: var(--radius-lg);
    background: var(--primary-light);
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
}
.top-book-icon .material-symbols-outlined { color: var(--primary); }
.top-book-info { flex: 1; min-width: 0; }
.top-book-info h4 { font-size: .875rem; font-weight: 700; color: var(--text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.top-book-info p { font-size: .75rem; color: var(--text-secondary); }
.top-book-count {
    padding: .25rem .75rem;
    border-radius: 9999px;
    background: #eff6ff;
    color: var(--primary);
    font-size: .75rem;
    font-weight: 700;
    white-space: nowrap;
}

/* Settings detail grid */
.settings-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.settings-grid .full { grid-column: 1 / -1; }
.detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: .75rem; }
.detail-box { background: #f8fafc; padding: .75rem; border-radius: var(--radius-lg); }
.detail-box .label { font-size: .75rem; color: var(--text-secondary); }
.detail-box .value { font-weight: 600; color: var(--text); margin-top: .125rem; }
.detail-box .value.success { color: var(--success); }
.detail-box .value.warning { color: var(--warning); }

/* ==================== WELCOME BANNER ==================== */
.welcome-banner {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    padding: 1.5rem 2rem;
    border-radius: var(--radius-xl);
    margin-bottom: 1.5rem;
}
.welcome-banner h3 { font-size: 1.25rem; font-weight: 700; }
.welcome-banner p { opacity: .85; font-size: .875rem; margin-top: .25rem; }

/* ==================== CATEGORY CHART ==================== */
.category-chart { display: flex; align-items: stretch; justify-content: space-between; gap: .75rem; height: 200px; padding-top: 1rem; }

/* ==================== RETURN INFO ==================== */
.return-info { background: #f8fafc; border-radius: var(--radius); padding: 1rem; margin-bottom: 1rem; }
.return-row { display: flex; justify-content: space-between; align-items: center; padding: .375rem 0; font-size: .875rem; }
.return-row span:first-child { color: var(--text-secondary); }
.return-row span:last-child { font-weight: 600; }

/* ==================== REPORTS GRID ==================== */
.reports-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-bottom: 1rem; }
@media (max-width: 1024px) { .reports-grid { grid-template-columns: 1fr; } }

/* ==================== FORM ROW ==================== */
@media (min-width: 641px) { .form-row { flex-direction: row; } }

/* ==================== TOAST ==================== */
.toast {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    z-index: 100;
    display: none;
}
.toast.show { display: block; }
.toast-inner {
    display: flex;
    align-items: center;
    gap: .75rem;
    padding: .75rem 1.25rem;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    color: white;
    font-size: .875rem;
    font-weight: 500;
}
.toast-inner.success { background: var(--success); }
.toast-inner.error { background: var(--danger); }
.toast-inner.warning { background: var(--warning); }

/* ==================== RESPONSIVE ==================== */
@media (max-width: 1024px) {
    .sidebar { width: 64px; }
    .sidebar .brand-name, .sidebar .brand-sub, .sidebar .nav-section,
    .sidebar .nav-item span:not(.material-symbols-outlined),
    .sidebar .sidebar-user-info { display: none; }
    .sidebar .sidebar-brand { justify-content: center; padding: 1.25rem .5rem; }
    .sidebar .nav-item { justify-content: center; padding: .625rem; }
    .sidebar .sidebar-user { justify-content: center; padding: .75rem .5rem; }
    .sidebar .sidebar-user .btn-icon { display: none; }
    .sidebar.expanded { width: 260px; }
    .sidebar.expanded .brand-name, .sidebar.expanded .brand-sub, .sidebar.expanded .nav-section,
    .sidebar.expanded .nav-item span:not(.material-symbols-outlined),
    .sidebar.expanded .sidebar-user-info { display: revert; }
    .sidebar.expanded .sidebar-brand { justify-content: flex-start; padding: 1.25rem; }
    .sidebar.expanded .nav-item { justify-content: flex-start; padding: .625rem .75rem; }
    .sidebar.expanded .sidebar-user { justify-content: flex-start; padding: .75rem; }
    .sidebar.expanded .sidebar-user .btn-icon { display: inline-flex; }
    .main-content { margin-left: 64px; }
    .main-content.expanded { margin-left: 260px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .trans-form-row { flex-direction: column; }
}
@media (max-width: 640px) {
    .stats-grid { grid-template-columns: 1fr; }
    .trans-form-grid, .return-info-grid, .form-grid, .settings-grid, .detail-grid { grid-template-columns: 1fr; }
    .pages-container { padding: 1rem; }
    .header { padding: 0 1rem; }
    .hidden-sm { display: none; }
    .toolbar-left { width: 100%; }
}

/* ==================== DARK MODE ==================== */
body.dark {
    --bg: #0f172a;
    --surface: #1e293b;
    --border: #334155;
    --text: #f1f5f9;
    --text-secondary: #94a3b8;
}
body.dark { background: var(--bg); color: var(--text); }
body.dark .sidebar { background: #1e293b; border-color: var(--border); }
body.dark .sidebar-brand { border-color: var(--border); }
body.dark .nav-item:hover { background: #334155; color: var(--text); }
body.dark .sidebar-user { border-color: var(--border); }
body.dark .header { background: #1e293b; border-color: var(--border); }
body.dark .section-card, body.dark .welcome-banner { background: #1e293b; border-color: var(--border); }
body.dark .stat-card { background: #1e293b; border-color: var(--border); }
body.dark .stat-info h3, body.dark .brand-name { color: var(--text); }
body.dark .data-table thead { background: #1e293b; }
body.dark .data-table thead th { color: #94a3b8; border-color: #334155; }
body.dark .data-table tbody tr { border-color: #334155; }
body.dark .data-table tbody tr:hover { background: #1e293b; }
body.dark .login-page { background: linear-gradient(135deg, #1e3a5f 0%, #1a2744 100%); }
body.dark .login-card { background: #1e293b; }
body.dark .login-card h2 { color: #f1f5f9; }
body.dark .form-group input, body.dark .form-group select, body.dark .login-card .form-group input {
    background: #0f172a; border-color: #334155; color: #f1f5f9;
}
body.dark .search-box { background: #0f172a; border-color: #334155; }
body.dark .search-box input { color: #f1f5f9; }
body.dark .toolbar-left select { background: #0f172a; border-color: #334155; color: #f1f5f9; }
body.dark .overdue-warnings { background: #2d1f00; border-color: #92400e; }
body.dark .overdue-item { background: #3d2700; border-color: #92400e; }
body.dark .return-info, body.dark .return-info-box { background: #0f172a; }
body.dark .detail-box { background: #0f172a; }
body.dark .notif-dropdown { background: #1e293b; border-color: #334155; }
body.dark .notif-item { border-color: #334155; }
body.dark .toast-inner { color: white; }
body.dark .chart-bar-value { filter: brightness(1.5); }
body.dark .top-book-item { border-color: #334155; }
body.dark .top-book-item:hover { background: #1e293b; }
body.dark ::-webkit-scrollbar-thumb { background: #475569; }
body.dark .login-card .form-group input:focus { box-shadow: 0 0 0 3px rgba(61,132,245,.3); }
body.dark .form-group input:focus, body.dark .form-group select:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(61,132,245,.2); }
body.dark .settings-prefs-grid { background: #0f172a; }
body.dark .pref-item { border-color: #334155; }
body.dark .pref-item:hover { background: #1e293b; }

/* ==================== TOGGLE SWITCH ==================== */
.toggle-switch { position: relative; display: inline-block; width: 44px; height: 24px; cursor: pointer; flex-shrink: 0; }
.toggle-switch input { opacity: 0; width: 0; height: 0; }
.toggle-slider {
    position: absolute; inset: 0;
    background: #cbd5e1; border-radius: 24px;
    transition: .3s;
}
.toggle-slider::before {
    content: ''; position: absolute;
    width: 18px; height: 18px;
    left: 3px; bottom: 3px;
    background: white; border-radius: 50%;
    transition: .3s;
    box-shadow: 0 1px 3px rgba(0,0,0,.2);
}
.toggle-switch input:checked + .toggle-slider { background: var(--primary); }
.toggle-switch input:checked + .toggle-slider::before { transform: translateX(20px); }

/* ==================== PAGINATION ==================== */
.pagination-wrap { display: flex; align-items: center; justify-content: space-between; padding: 1rem 0 .25rem; flex-wrap: wrap; gap: .5rem; }
.pagination-info { font-size: .8125rem; color: var(--text-secondary); }
.pagination-btns { display: flex; align-items: center; gap: .25rem; }
.pagination-ellipsis { padding: .375rem .5rem; color: var(--text-secondary); font-size: .875rem; }

/* ==================== SETTINGS PREFERENCES ==================== */
.settings-prefs-grid {
    background: #f8fafc; border-radius: var(--radius-lg);
    border: 1px solid var(--border);
    overflow: hidden;
}
body.dark .settings-prefs-grid { background: #0f172a; }
.pref-item {
    display: flex; align-items: center; justify-content: space-between;
    padding: 1rem 1.25rem; border-bottom: 1px solid var(--border);
    transition: background .15s;
}
.pref-item:last-child { border-bottom: none; }
.pref-item:hover { background: rgba(0,0,0,.03); }
body.dark .pref-item:hover { background: #1e293b; }
.pref-info { display: flex; flex-direction: column; gap: .125rem; }
.pref-label { font-size: .875rem; font-weight: 600; color: var(--text); }
.pref-desc { font-size: .75rem; color: var(--text-secondary); }

/* ==================== BTN DANGER ==================== */
.btn-danger { background: var(--danger); color: white; box-shadow: var(--shadow); }
.btn-danger:hover { background: #b91c1c; }

/* ==================== GLOBAL LOADING ==================== */
.global-loading {
    position: fixed; inset: 0;
    background: rgba(0,0,0,.35);
    z-index: 9999;
    display: flex; align-items: center; justify-content: center;
    backdrop-filter: blur(2px);
}
.global-loading.hidden { display: none; }
.loading-spinner {
    width: 40px; height: 40px;
    border: 3px solid rgba(255,255,255,.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ==================== EMPTY STATE ICON ==================== */
.empty-state-icon {
    width: 64px; height: 64px; border-radius: var(--radius-xl);
    background: var(--primary-light);
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 1rem;
}
body.dark .empty-state-icon { background: rgba(61,132,245,.15); }

/* ==================== ENTRANCE ANIMATIONS ==================== */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}
.page.active .section-card,
.page.active .stat-card,
.page.active .stats-grid,
.page.active .welcome-banner,
.page.active .overdue-warnings,
.page.active .reports-grid {
    animation: fadeInUp .35s ease-out both;
}
.page.active .section-card:nth-child(1) { animation-delay: .05s; }
.page.active .section-card:nth-child(2) { animation-delay: .1s; }
.page.active .section-card:nth-child(3) { animation-delay: .15s; }
.page.active .stat-card:nth-child(1) { animation-delay: .05s; }
.page.active .stat-card:nth-child(2) { animation-delay: .1s; }
.page.active .stat-card:nth-child(3) { animation-delay: .15s; }
.page.active .stat-card:nth-child(4) { animation-delay: .2s; }

/* ==================== GLOBAL SEARCH HIGHLIGHT ==================== */
.search-highlight { background: #fef08a; color: #1e293b; border-radius: 2px; padding: 0 2px; }
body.dark .search-highlight { background: #854d0e; color: #fef9c3; }

/* ==================== GLOBAL SEARCH RESULTS ==================== */
.gs-result {
    display: flex; align-items: center; gap: .75rem;
    padding: .75rem; border-radius: var(--radius-lg);
    cursor: pointer; transition: background .15s;
    border-bottom: 1px solid var(--border);
}

/* ==================== FORM VALIDATION ==================== */
.form-group input.error, .form-group select.error {
    border-color: var(--danger) !important;
    box-shadow: 0 0 0 3px rgba(220,38,38,.12) !important;
}
.form-error-msg {
    font-size: .75rem;
    color: var(--danger);
    margin-top: .25rem;
    display: none;
}
.form-error-msg.show { display: block; }

/* ==================== QUICK ACTIONS ==================== */
.quick-actions {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: .75rem;
    margin-bottom: 1.5rem;
}
.quick-action-btn {
    display: flex;
    align-items: center;
    gap: .75rem;
    padding: .875rem 1rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    cursor: pointer;
    transition: all .2s;
    font-family: inherit;
    font-size: .875rem;
    font-weight: 500;
    color: var(--text);
    text-align: left;
}
.quick-action-btn:hover {
    border-color: var(--primary);
    background: var(--primary-light);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}
.quick-action-icon {
    width: 36px; height: 36px;
    border-radius: var(--radius);
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
}
.quick-action-icon.blue { background: rgba(61,132,245,.12); color: #3d84f5; }
.quick-action-icon.green { background: rgba(16,185,129,.12); color: #10b981; }
.quick-action-icon.orange { background: rgba(245,158,11,.12); color: #f59e0b; }
.quick-action-icon.purple { background: rgba(139,92,246,.12); color: #8b5cf6; }

/* ==================== DASHBOARD CHARTS ==================== */
.dash-chart-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}
@media (max-width: 1024px) { .dash-chart-grid { grid-template-columns: 1fr; } }

/* ==================== ACTIVITY FEED ==================== */
.activity-feed {
    display: flex;
    flex-direction: column;
    gap: .5rem;
    max-height: 320px;
    overflow-y: auto;
}
.activity-feed-item {
    display: flex;
    align-items: flex-start;
    gap: .75rem;
    padding: .625rem;
    border-radius: var(--radius-lg);
    font-size: .8125rem;
    transition: background .15s;
}
.activity-feed-item:hover { background: #f8fafc; }
body.dark .activity-feed-item:hover { background: #1e293b; }
.activity-feed-icon {
    width: 28px; height: 28px;
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
}
.activity-feed-icon.blue { background: #dbeafe; color: #3d84f5; }
.activity-feed-icon.green { background: #d1fae5; color: #10b981; }
.activity-feed-icon.orange { background: #ffedd5; color: #f59e0b; }
.activity-feed-icon.red { background: #fee2e2; color: #ef4444; }
.activity-feed-icon.purple { background: #ede9fe; color: #8b5cf6; }
.activity-feed-text { flex: 1; }
.activity-feed-text strong { color: var(--text); font-weight: 600; }
.activity-feed-text p { color: var(--text-secondary); margin: 0; }
.activity-feed-time { font-size: .6875rem; color: var(--text-secondary); white-space: nowrap; }

/* ==================== OVERDUE WARNING DETAIL ==================== */
.overdue-card {
    background: #fff7ed;
    border: 1px solid #fed7aa;
    border-radius: var(--radius-lg);
    padding: .875rem 1rem;
    display: flex;
    align-items: center;
    gap: .75rem;
    font-size: .875rem;
    transition: background .15s;
}
body.dark .overdue-card { background: #2d1f00; border-color: #92400e; }
.overdue-card:hover { background: #fff0e0; }
body.dark .overdue-card:hover { background: #3d2700; }
.overdue-card-icon { color: #dc2626; flex-shrink: 0; }
.overdue-card-info { flex: 1; }
.overdue-card-info strong { color: var(--text); }
.overdue-card-days { font-weight: 700; color: #dc2626; white-space: nowrap; }

/* ==================== BOOK AVAIL BADGE ==================== */
.availability-bar {
    display: flex;
    align-items: center;
    gap: .5rem;
    font-size: .8125rem;
}
.availability-bar-track {
    flex: 1;
    height: 6px;
    background: #e2e8f0;
    border-radius: 3px;
    overflow: hidden;
}
body.dark .availability-bar-track { background: #334155; }
.availability-bar-fill {
    height: 100%;
    border-radius: 3px;
    transition: width .5s ease;
}
.avail-fill-green { background: #10b981; }
.avail-fill-red { background: #ef4444; }
.avail-fill-yellow { background: #f59e0b; }

/* ==================== LIMIT INFO BOX ==================== */
.limit-info {
    margin-top: .75rem;
}
.limit-info-box {
    border-radius: 0 var(--radius) var(--radius) 0;
    padding: .625rem .875rem;
    font-size: .8125rem;
    line-height: 1.6;
}

/* ==================== EXTEND TABLE ==================== */
.extend-instruction {
    font-size: .875rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    padding: .625rem .875rem;
    background: var(--surface);
    border-radius: var(--radius);
    border-left: 3px solid var(--primary);
}

.extend-table tbody tr.row-overdue {
    background: #fff7ed;
}
body.dark .extend-table tbody tr.row-overdue {
    background: #2d1f00;
}

.renew-dots-row {
    display: flex;
    gap: .25rem;
    justify-content: center;
    margin-top: .25rem;
}
.renew-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #e2e8f0;
    border: 1px solid #cbd5e1;
    display: inline-block;
}
body.dark .renew-dot {
    background: #334155;
    border-color: #475569;
}
.renew-dot.used {
    background: var(--primary);
    border-color: var(--primary);
}

.btn-renew {
    background: rgba(61, 132, 245, .08);
    color: var(--primary);
    border: 1px solid rgba(61, 132, 245, .25);
    padding: .375rem .75rem;
    font-size: .8125rem;
    display: inline-flex;
    align-items: center;
    gap: .25rem;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all .15s;
    font-family: inherit;
    white-space: nowrap;
}
.btn-renew:hover:not(:disabled) {
    background: rgba(61, 132, 245, .15);
    border-color: var(--primary);
    transform: translateY(-1px);
}
.btn-renew:active:not(:disabled) {
    transform: translateY(0);
}

/* ==================== EXTEND MODAL ==================== */
.modal-sm { max-width: 440px; }
.extend-modal-detail {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 1rem;
    border: 1px solid var(--border);
}
.extend-modal-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: .375rem 0;
    font-size: .875rem;
    border-bottom: 1px solid var(--border);
}
.extend-modal-row:last-child { border-bottom: none; }
.extend-modal-row span { color: var(--text-secondary); }

/* ==================== ACTION MODAL ==================== */
.action-modal-detail {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 1rem;
    border: 1px solid var(--border);
}
.action-modal-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: .375rem 0;
    font-size: .875rem;
    border-bottom: 1px solid var(--border);
}
.action-modal-row:last-child { border-bottom: none; }
.action-modal-row span { color: var(--text-secondary); }

/* Action buttons row */
.action-btns-row {
    display: flex;
    gap: .375rem;
    justify-content: center;
    align-items: center;
}

.btn-return {
    background: rgba(16, 185, 129, .08);
    color: #10b981;
    border: 1px solid rgba(16, 185, 129, .25);
    padding: .375rem .625rem;
    font-size: .8125rem;
    display: inline-flex;
    align-items: center;
    gap: .25rem;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all .15s;
    font-family: inherit;
    white-space: nowrap;
}
.btn-return:hover:not(:disabled) {
    background: rgba(16, 185, 129, .15);
    border-color: #10b981;
    transform: translateY(-1px);
}
.btn-return:active:not(:disabled) { transform: translateY(0); }

/* ==================== TOP READER ==================== */
.top-reader-item {
    display: flex;
    align-items: center;
    gap: .75rem;
    padding: .75rem;
    border-bottom: 1px solid var(--border);
    font-size: .875rem;
}
.top-reader-item:last-child { border-bottom: none; }
.top-reader-rank {
    font-weight: 800;
    color: var(--text-secondary);
    width: 20px;
    text-align: center;
    flex-shrink: 0;
}
.top-reader-info { flex: 1; min-width: 0; }
.top-reader-bar-track {
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    overflow: hidden;
}
.top-reader-bar-fill {
    height: 100%;
    border-radius: 3px;
    transition: width .5s ease;
}
.top-reader-count {
    font-size: .75rem;
    font-weight: 700;
    color: var(--text-secondary);
    white-space: nowrap;
}

/* ==================== END ==================== */

/* ==================== READER PORTAL ==================== */
.catalog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1rem;
    padding: .25rem 0;
}
.catalog-card {
    display: flex;
    gap: .875rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1rem;
    transition: box-shadow .2s, transform .2s;
}
.catalog-card:hover {
    box-shadow: 0 4px 16px rgba(0,0,0,.1);
    transform: translateY(-2px);
}
.catalog-card-icon {
    width: 48px; height: 56px;
    border-radius: .5rem;
    background: var(--primary-light);
    color: var(--primary);
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
}
.catalog-card-body { flex: 1; min-width: 0; }
.catalog-card-title {
    font-weight: 700; font-size: .9375rem;
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
    margin-bottom: .25rem;
}
.catalog-card-author {
    font-size: .8rem; color: var(--text-secondary);
    margin-bottom: .5rem;
    white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.catalog-card-meta {
    display: flex; gap: .375rem; flex-wrap: wrap; margin-bottom: .5rem;
}
.catalog-card-footer {
    display: flex; align-items: center; justify-content: space-between; gap: .5rem; flex-wrap: wrap;
}
.reader-status-banner {
    background: linear-gradient(135deg, var(--primary), #6366f1);
    border-radius: var(--radius-lg);
    color: #fff;
    padding: 1rem 1.5rem;
}
.reader-status-banner-inner {
    display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: .75rem;
}