/**
 * AVA — Modern 2026 Educational Design System
 * Aesthetic: Clean + Soft Design + Educational Tech
 */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Plus+Jakarta+Sans:wght@500;600;700;800&display=swap');

:root {
    /* Primary Colors (Modern Indigo) */
    --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;
    --primary: #4F46E5;
    --primary-hover: #4338CA;
    --primary-light: #EEF2FF;

    /* Neutrals & Surfaces */
    --bg-app: #F8FAFC;
    --bg-main: #F8FAFC;
    --surface: #FFFFFF;
    --surface-secondary: #F1F5F9;
    --surface-hover: #F8FAFC;
    --border-color: #E2E8F0;
    --border-focus: #CBD5E1;
    --border-subtle: #F1F5F9;

    /* Text Colors */
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-muted: #94A3B8;
    --text-subtle: #CBD5E1;

    /* Semantic Status Colors */
    --success: #16A34A;
    --success-light: #DCFCE7;
    --success-border: #BBF7D0;
    --warning: #D97706;
    --warning-light: #FEF3C7;
    --warning-border: #FDE68A;
    --danger: #DC2626;
    --danger-light: #FEE2E2;
    --danger-border: #FECACA;
    --info: #0284C7;
    --info-light: #E0F2FE;
    --info-border: #BAE6FD;

    /* Shadows */
    --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.04);
    --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.05), 0 1px 2px rgba(15, 23, 42, 0.03);
    --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.05), 0 1px 3px rgba(15, 23, 42, 0.02);
    --shadow-lg: 0 10px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);

    /* Radii */
    --radius-xs: 4px;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 20px;
    --radius-full: 9999px;

    /* Dimensions */
    --sidebar-width: 260px;
    --topbar-height: 64px;
    --content-max-width: 1440px;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 250ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================================================
   Base Styles & Reset
   ========================================================================== */
*, *::before, *::after {
    box-sizing: border-box;
}

html {
    max-width: 100vw;
    width: 100%;
    overflow-x: hidden;
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

/* Modern Minimalist Scrollbars (Cross-browser) */
* {
    scrollbar-width: thin;
    scrollbar-color: rgba(148, 163, 184, 0.35) transparent;
}

::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(148, 163, 184, 0.35);
    border-radius: var(--radius-full);
    transition: background var(--transition-fast);
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(100, 116, 139, 0.6);
}

body {
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-app);
    color: var(--text-primary);
    margin: 0;
    padding: 0;
    min-height: 100vh;
    font-size: 0.9375rem;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    max-width: 100vw;
    width: 100%;
    overflow-x: hidden;
    position: relative;
}

img, video, iframe, canvas, svg, object {
    max-width: 100%;
    height: auto;
}

h1, h2, h3, h4, h5, h6, .font-heading {
    font-family: 'Plus Jakarta Sans', 'Inter', sans-serif;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

h1, .h1 { font-size: 1.75rem; font-weight: 700; line-height: 1.25; }
h2, .h2 { font-size: 1.5rem; font-weight: 700; line-height: 1.3; }
h3, .h3 { font-size: 1.25rem; font-weight: 700; line-height: 1.35; }
h4, .h4 { font-size: 1.125rem; font-weight: 600; line-height: 1.4; }
h5, .h5 { font-size: 1rem; font-weight: 600; line-height: 1.4; }
h6, .h6 { font-size: 0.875rem; font-weight: 600; line-height: 1.4; }

p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}
a:hover {
    color: var(--primary-hover);
}

/* ==========================================================================
   App Layout & Shell
   ========================================================================== */
.app-wrapper {
    display: flex;
    min-height: 100vh;
    background-color: var(--bg-app);
    max-width: 100vw;
    width: 100%;
    overflow-x: hidden;
    position: relative;
}

/* Sidebar */
.app-sidebar {
    width: var(--sidebar-width);
    background-color: #FFFFFF;
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 1040;
    transition: transform var(--transition-smooth);
}

.sidebar-brand {
    height: var(--topbar-height);
    display: flex;
    align-items: center;
    padding: 0 1.5rem;
    border-bottom: 1px solid var(--border-color);
    text-decoration: none;
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-weight: 800;
    font-size: 1.25rem;
    color: var(--text-primary);
    letter-spacing: -0.03em;
}
.sidebar-brand span.text-primary, .sidebar-brand span {
    color: var(--primary);
}

.sidebar-menu {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    padding: 1.25rem 0.875rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    scrollbar-width: thin;
    scrollbar-color: transparent transparent;
    transition: scrollbar-color var(--transition-base);
}

.sidebar-menu:hover {
    scrollbar-color: rgba(148, 163, 184, 0.4) transparent;
}

.sidebar-menu::-webkit-scrollbar {
    width: 5px;
}

.sidebar-menu::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar-menu::-webkit-scrollbar-thumb {
    background-color: transparent;
    border-radius: var(--radius-full);
    transition: background-color var(--transition-base);
}

.sidebar-menu:hover::-webkit-scrollbar-thumb {
    background-color: rgba(148, 163, 184, 0.35);
}

.sidebar-menu::-webkit-scrollbar-thumb:hover {
    background-color: var(--primary);
}

.sidebar-section-title {
    font-size: 0.6875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    padding: 0.75rem 0.75rem 0.35rem 0.75rem;
    margin-top: 0.5rem;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.6rem 0.875rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}
.sidebar-link i {
    font-size: 1.15rem;
    width: 20px;
    text-align: center;
    color: var(--text-muted);
    transition: color var(--transition-fast);
}
.sidebar-link:hover {
    color: var(--primary);
    background-color: var(--primary-50);
}
.sidebar-link:hover i {
    color: var(--primary);
}
.sidebar-link.active {
    color: var(--primary);
    background-color: var(--primary-50);
    font-weight: 600;
}
.sidebar-link.active i {
    color: var(--primary);
}
.sidebar-link.disabled {
    opacity: 0.5;
    cursor: default;
    pointer-events: none;
}

.sidebar-footer {
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--border-color);
    background-color: #FFFFFF;
}

/* Main Area */
.app-main {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background-color: var(--bg-app);
    max-width: calc(100vw - var(--sidebar-width));
    width: 100%;
    min-width: 0;
    overflow-x: hidden;
}

/* Topbar */
.app-topbar {
    height: var(--topbar-height);
    background-color: #FFFFFF;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.75rem;
    position: sticky;
    top: 0;
    z-index: 1030;
    width: 100%;
}

.app-content {
    flex: 1;
    padding: 1.75rem 2rem;
    max-width: var(--content-max-width);
    width: 100%;
    margin: 0 auto;
    min-width: 0;
}

/* ==========================================================================
   Modern Cards & Containers
   ========================================================================== */
.card-ava {
    background-color: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xs);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}
.card-ava:hover {
    border-color: var(--border-focus);
    box-shadow: var(--shadow-sm);
}

.card-interactive {
    transition: all var(--transition-smooth);
}
.card-interactive:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-200);
}

/* Modern Metric / KPI Card */
.kpi-card {
    background-color: var(--surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-xs);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: all var(--transition-base);
}
.kpi-card:hover {
    box-shadow: var(--shadow-sm);
    border-color: var(--border-focus);
}
.kpi-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.75rem;
}
.kpi-icon-box {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}
.kpi-icon-indigo { background-color: var(--primary-50); color: var(--primary); }
.kpi-icon-green  { background-color: var(--success-light); color: var(--success); }
.kpi-icon-amber  { background-color: var(--warning-light); color: var(--warning); }
.kpi-icon-sky, .kpi-icon-blue { background-color: var(--info-light); color: var(--info); }
.kpi-icon-rose, .kpi-icon-pink { background-color: #FFE4E6; color: #E11D48; }
.kpi-icon-purple { background-color: #F3E8FF; color: #9333EA; }

.kpi-value {
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
    letter-spacing: -0.03em;
}
.kpi-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}
.kpi-subtext {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.35rem;
}

/* ==========================================================================
   Modern Buttons
   ========================================================================== */
.btn {
    font-family: 'Inter', sans-serif;
    font-weight: 500;
    border-radius: var(--radius-md);
    padding: 0.55rem 1rem;
    font-size: 0.875rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all var(--transition-fast);
    line-height: 1.4;
}

.btn-sm {
    padding: 0.4rem 0.75rem;
    font-size: 0.8125rem;
    border-radius: var(--radius-sm);
}

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    border-radius: var(--radius-md);
}

.btn-primary-ava {
    background-color: var(--primary);
    border: 1px solid var(--primary);
    color: #FFFFFF;
    box-shadow: 0 1px 2px rgba(79, 70, 229, 0.2);
}
.btn-primary-ava:hover, .btn-primary-ava:focus {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
    color: #FFFFFF;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
}

.btn-secondary-ava {
    background-color: #FFFFFF;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    box-shadow: var(--shadow-xs);
}
.btn-secondary-ava:hover {
    background-color: var(--surface-secondary);
    border-color: var(--border-focus);
    color: var(--text-primary);
}

.btn-outline-ava {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}
.btn-outline-ava:hover {
    background-color: var(--surface-secondary);
    color: var(--text-primary);
    border-color: var(--border-focus);
}

.btn-ghost-ava {
    background-color: transparent;
    border: 1px solid transparent;
    color: var(--text-secondary);
}
.btn-ghost-ava:hover {
    background-color: var(--surface-secondary);
    color: var(--text-primary);
}

/* ==========================================================================
   Modern Forms & Inputs
   ========================================================================== */
.form-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.4rem;
    display: inline-block;
}

.form-control, .form-select {
    height: 42px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.5rem 0.875rem;
    font-size: 0.875rem;
    color: var(--text-primary);
    background-color: var(--surface);
    box-shadow: var(--shadow-xs);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

textarea.form-control {
    height: auto;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
    outline: none;
}

.form-control::placeholder {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.form-text {
    font-size: 0.8125rem;
    color: var(--text-muted);
    margin-top: 0.35rem;
}

/* Search bar with Icon */
.search-input-wrapper {
    position: relative;
}
.search-input-wrapper i {
    position: absolute;
    left: 0.875rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    pointer-events: none;
}
.search-input-wrapper input {
    padding-left: 2.35rem;
}

/* ==========================================================================
   Modern Tables
   ========================================================================== */
.table-responsive {
    border-radius: var(--radius-lg);
    background-color: var(--surface);
    box-shadow: var(--shadow-xs);
    width: 100%;
    max-width: 100%;
    overflow-x: auto !important;
    -webkit-overflow-scrolling: touch;
    margin-bottom: 0;
    position: relative;
}

.dropdown-menu {
    z-index: 1060 !important;
    box-shadow: var(--shadow-lg) !important;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
}

.table {
    margin-bottom: 0;
    color: var(--text-primary);
    border-color: var(--border-color);
}

.table > :not(caption) > * > * {
    padding: 0.875rem 1.25rem;
    border-bottom-color: var(--border-color);
}

@media (max-width: 1366px) {
    .table > :not(caption) > * > * {
        padding: 0.75rem 0.875rem;
    }
}

.table thead th {
    background-color: var(--bg-app);
    color: var(--text-secondary);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-top: none;
    border-bottom: 1px solid var(--border-color);
}

.table-hover > tbody > tr:hover > * {
    background-color: var(--surface-hover);
}

/* ==========================================================================
   Modern Badges
   ========================================================================== */
.badge {
    padding: 0.35em 0.65em;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    letter-spacing: 0.01em;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

.badge-status {
    padding: 0.35rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}

.badge-success { background-color: var(--success-light); color: var(--success); border: 1px solid var(--success-border); }
.badge-warning { background-color: var(--warning-light); color: var(--warning); border: 1px solid var(--warning-border); }
.badge-danger  { background-color: var(--danger-light); color: var(--danger); border: 1px solid var(--danger-border); }
.badge-info    { background-color: var(--info-light); color: var(--info); border: 1px solid var(--info-border); }
.badge-primary { background-color: var(--primary-50); color: var(--primary); border: 1px solid var(--primary-100); }
.badge-secondary { background-color: var(--surface-secondary); color: var(--text-secondary); border: 1px solid var(--border-color); }

/* ==========================================================================
   Progress Bars
   ========================================================================== */
.progress {
    height: 8px;
    background-color: var(--surface-secondary);
    border-radius: var(--radius-full);
    overflow: hidden;
    box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.05);
}
.progress-bar {
    background-color: var(--primary-500);
    border-radius: var(--radius-full);
    transition: width 0.4s ease;
}
.progress-bar.bg-success { background-color: var(--success) !important; }
.progress-bar.bg-warning { background-color: var(--warning) !important; }
.progress-bar.bg-danger  { background-color: var(--danger) !important; }

/* ==========================================================================
   Avatars
   ========================================================================== */
.avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
    flex-shrink: 0;
}
.avatar-sm { width: 28px; height: 28px; font-size: 0.75rem; }
.avatar-lg { width: 48px; height: 48px; font-size: 1.125rem; }
.avatar-xl { width: 64px; height: 64px; font-size: 1.5rem; }

.avatar-primary { background-color: var(--primary-50); color: var(--primary); }
.avatar-slate   { background-color: var(--surface-secondary); color: var(--text-secondary); }
.avatar-green   { background-color: var(--success-light); color: var(--success); }

/* ==========================================================================
   Modern Sliding Pagination
   ========================================================================== */
.pagination {
    gap: 0.25rem;
    margin-bottom: 0;
    align-items: center;
}
.page-item .page-link {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md) !important;
    color: var(--text-secondary);
    font-size: 0.8125rem;
    font-weight: 500;
    padding: 0.35rem 0.65rem;
    background-color: #FFFFFF;
    transition: all var(--transition-fast);
    min-width: 32px;
    text-align: center;
}
.page-item .page-link:hover {
    background-color: var(--primary-50);
    border-color: var(--primary-200);
    color: var(--primary);
}
.page-item.active .page-link {
    background-color: var(--primary) !important;
    border-color: var(--primary) !important;
    color: #FFFFFF !important;
    font-weight: 600;
    box-shadow: 0 1px 2px rgba(79, 70, 229, 0.2);
}
.page-item.disabled .page-link {
    background-color: var(--surface-secondary);
    border-color: var(--border-color);
    color: var(--text-muted);
    opacity: 0.6;
    pointer-events: none;
}
.page-item-dots {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 0.35rem;
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.8125rem;
    user-select: none;
}

/* ==========================================================================
   Empty States
   ========================================================================== */
.empty-state {
    text-align: center;
    padding: 3.5rem 1.5rem;
    border: 1px dashed var(--border-color);
    border-radius: var(--radius-lg);
    background-color: var(--surface);
}
.empty-state-icon {
    width: 56px;
    height: 56px;
    background-color: var(--primary-50);
    color: var(--primary);
    border-radius: var(--radius-full);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 1rem;
}
.empty-state-title {
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.35rem;
}
.empty-state-text {
    font-size: 0.875rem;
    color: var(--text-secondary);
    max-width: 400px;
    margin: 0 auto 1.25rem auto;
    line-height: 1.5;
}

/* ==========================================================================
   Modern Auth Split-Screen
   ========================================================================== */
.auth-split-layout {
    display: flex;
    min-height: 100vh;
    background-color: #FFFFFF;
}
.auth-sidebar-hero {
    flex: 1;
    background: linear-gradient(135deg, #312E81 0%, #4F46E5 50%, #6366F1 100%);
    color: #FFFFFF;
    padding: 4rem 3rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
    overflow: hidden;
}
.auth-sidebar-hero::before {
    content: '';
    position: absolute;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(255,255,255,0.15) 0%, rgba(255,255,255,0) 70%);
    top: -50px;
    right: -50px;
    border-radius: 50%;
}
.auth-form-container {
    width: 100%;
    max-width: 520px;
    padding: 3rem 2.5rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    background-color: #FFFFFF;
}

/* ==========================================================================
   Modern Tabs & Pills
   ========================================================================== */
.nav-tabs-ava {
    border-bottom: 1px solid var(--border-color);
    gap: 0.5rem;
}
.nav-tabs-ava .nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.875rem;
    padding: 0.75rem 1.25rem;
    border: 1px solid transparent;
    border-top-left-radius: var(--radius-md);
    border-top-right-radius: var(--radius-md);
    transition: all var(--transition-fast);
}
.nav-tabs-ava .nav-link:hover {
    color: var(--primary);
    background-color: var(--surface-hover);
    border-color: transparent;
}
.nav-tabs-ava .nav-link.active {
    color: var(--primary);
    background-color: #FFFFFF;
    border-color: var(--border-color) var(--border-color) #FFFFFF;
    font-weight: 600;
}

/* ==========================================================================
   Exam Room & Question Choices
   ========================================================================== */
.timer-pill {
    background-color: #FFFFFF;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    padding: 0.4rem 1rem;
    box-shadow: var(--shadow-sm);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: 'Plus Jakarta Sans', sans-serif;
    font-weight: 700;
    color: var(--primary);
}
.choice-card {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem;
    background-color: var(--surface);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.875rem;
}
.choice-card:hover {
    border-color: var(--primary-300);
    background-color: var(--primary-50);
}
.choice-card.selected {
    border-color: var(--primary);
    background-color: var(--primary-50);
}

/* ==========================================================================
   Responsive & Mobile Adjustments (Smartphones & Tablets)
   ========================================================================== */

/* Medium & Small Devices (Tablets, iPads, Phablets <= 991.98px) */
@media (max-width: 991.98px) {
    .app-sidebar {
        transform: translateX(-100%);
        width: 280px;
        max-width: 82vw;
        box-shadow: var(--shadow-lg);
        z-index: 1050;
        overscroll-behavior: contain;
    }
    .app-sidebar.show {
        transform: translateX(0);
    }
    .app-main {
        margin-left: 0;
        max-width: 100vw;
        width: 100%;
    }
    .sidebar-overlay {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background-color: rgba(15, 23, 42, 0.5);
        backdrop-filter: blur(3px);
        z-index: 1045;
        display: none;
        opacity: 0;
        transition: opacity 0.25s ease-in-out;
    }
    .sidebar-overlay.show {
        display: block;
        opacity: 1;
    }
    .app-topbar {
        padding: 0 1.25rem;
    }
    .app-content {
        padding: 1.25rem 1rem;
    }
    .auth-split-layout {
        flex-direction: column;
    }
    .auth-sidebar-hero {
        display: none;
    }
    .auth-form-container {
        max-width: 100%;
        padding: 2.5rem 1.5rem;
    }
    .table {
        min-width: 560px;
    }
}

/* Small Devices (Landscape Phones & Small Tablets <= 767.98px) */
@media (max-width: 767.98px) {
    .app-topbar {
        padding: 0 0.875rem;
        height: 58px;
        gap: 0.5rem;
    }
    .app-content {
        padding: 1rem 0.75rem;
    }

    /* Prevent mobile browser zoom on form focus (iOS Safari & Android) */
    .form-control, .form-select, input[type="text"], input[type="email"], input[type="password"], input[type="number"], select, textarea {
        font-size: 16px !important;
    }

    /* Compact Cards */
    .card-ava {
        border-radius: var(--radius-md);
    }
    .card-ava.p-4, .card-ava .p-4, .card.p-4 {
        padding: 1rem !important;
    }
    .card-ava.p-5, .card-ava .p-5, .card.p-5 {
        padding: 1.25rem 1rem !important;
    }
    .card-ava.p-3, .card-ava .p-3 {
        padding: 0.875rem !important;
    }

    /* KPI Cards */
    .kpi-card {
        padding: 1rem;
    }
    .kpi-value {
        font-size: 1.5rem;
    }
    .kpi-icon-box {
        width: 38px;
        height: 38px;
        font-size: 1.15rem;
    }

    /* Dropdown Menus aligned on mobile */
    .dropdown-menu-end {
        right: 0 !important;
        left: auto !important;
        max-width: calc(100vw - 1.5rem) !important;
    }
    .dropdown-menu {
        max-width: calc(100vw - 1.5rem) !important;
    }

    /* Modals on Mobile */
    .modal-dialog {
        margin: 0.75rem auto;
        max-width: calc(100vw - 1.5rem);
    }

    /* Breadcrumbs horizontal smooth swipe */
    .breadcrumb {
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        white-space: nowrap;
        font-size: 0.8125rem;
        padding-bottom: 2px;
        scrollbar-width: none;
    }
    .breadcrumb::-webkit-scrollbar {
        display: none;
    }

    /* Tabs horizontal smooth swipe */
    .nav-tabs-ava {
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        white-space: nowrap;
        scrollbar-width: none;
        padding-left: 0.75rem !important;
        padding-right: 0.75rem !important;
    }
    .nav-tabs-ava::-webkit-scrollbar {
        display: none;
    }
    .nav-tabs-ava .nav-link {
        white-space: nowrap;
        padding: 0.6rem 0.875rem;
        font-size: 0.8125rem;
    }

    /* Tables Mobile Touch Optimization */
    .table {
        min-width: 520px;
    }
    .table > :not(caption) > * > * {
        padding: 0.65rem 0.75rem;
        font-size: 0.8125rem;
    }
    .table thead th {
        font-size: 0.7rem;
        padding: 0.65rem 0.75rem;
        white-space: nowrap;
    }

    /* Exam Screen Mobile Header */
    .timer-pill {
        padding: 0.35rem 0.75rem;
        font-size: 0.875rem;
    }
}

/* Extra Small Devices (Smartphones <= 575.98px) */
@media (max-width: 575.98px) {
    .app-topbar {
        padding: 0 0.75rem;
        height: 56px;
        gap: 0.35rem;
    }
    .app-content {
        padding: 0.875rem 0.625rem;
    }

    /* Typography scale on mobile */
    h1, .h1 { font-size: 1.3rem; line-height: 1.25; }
    h2, .h2 { font-size: 1.15rem; line-height: 1.3; }
    h3, .h3 { font-size: 1.05rem; line-height: 1.35; }
    h4, .h4 { font-size: 0.95rem; line-height: 1.4; }
    h5, .h5 { font-size: 0.9rem; line-height: 1.4; }
    h6, .h6 { font-size: 0.85rem; line-height: 1.4; }

    /* Button adjustments */
    .btn {
        font-size: 0.8125rem;
        padding: 0.5rem 0.875rem;
    }
    .btn-lg {
        padding: 0.65rem 1rem;
        font-size: 0.9375rem;
        width: 100%;
    }

    /* Form Filter Bars Stacking */
    .card-ava form .btn {
        width: 100%;
    }
    .input-group {
        flex-wrap: nowrap !important;
    }

    /* Choice cards in exam */
    .choice-card {
        padding: 0.75rem 0.875rem;
        gap: 0.6rem;
        align-items: flex-start;
    }

    /* Pagination Mobile Wrapping */
    .pagination {
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.2rem;
    }
    .page-item .page-link {
        min-width: 1.85rem;
        height: 1.85rem;
        font-size: 0.75rem;
        padding: 0 0.35rem;
    }
    .page-item-dots {
        min-width: 1.25rem;
        height: 1.85rem;
        font-size: 0.75rem;
    }

    /* Auth screen container on mobile */
    .auth-form-container {
        padding: 1.5rem 1rem;
    }

    /* Rich Content Body */
    .content-body {
        font-size: 0.95rem;
        line-height: 1.65;
    }
    .content-body pre {
        padding: 0.75rem;
        font-size: 0.8rem;
    }
}

/* Ultra Compact Phones (<= 380px, e.g. iPhone SE, Galaxy Fold outer screen) */
@media (max-width: 380px) {
    .app-topbar {
        padding: 0 0.5rem;
    }
    .app-content {
        padding: 0.75rem 0.5rem;
    }
    .card-ava.p-4, .card-ava .p-4, .card.p-4 {
        padding: 0.875rem 0.75rem !important;
    }
    .kpi-value {
        font-size: 1.25rem;
    }
    .kpi-label {
        font-size: 0.8rem;
    }
}

/* Line Clamp Utilities */
.line-clamp-1 {
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.line-clamp-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.line-clamp-3 {
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ==========================================================================
   Rich Content Body & Article Typography
   ========================================================================== */
.content-body {
    color: var(--text-primary);
    font-size: 1.05rem;
    line-height: 1.8;
    word-break: break-word;
}

.content-body h1, .content-body h2, .content-body h3, .content-body h4, .content-body h5, .content-body h6 {
    margin-top: 1.75rem;
    margin-bottom: 0.75rem;
    font-weight: 700;
    color: var(--text-primary);
}

.content-body p {
    margin-bottom: 1.25rem;
    color: var(--text-primary);
}

.content-body img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin: 1.25rem 0;
    box-shadow: var(--shadow-sm);
    display: inline-block;
}

.content-body iframe.ql-video,
.content-body iframe {
    max-width: 100% !important;
    aspect-ratio: 16 / 9;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    margin: 1.25rem 0;
    border: 0;
    display: block;
}

.content-body table {
    width: 100% !important;
    margin: 1.5rem 0;
    border-collapse: collapse;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.content-body table th,
.content-body table td {
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    vertical-align: top;
}

.content-body table th {
    background-color: #F8FAFC;
    font-weight: 600;
    color: var(--text-primary);
}

.content-body table tr:nth-child(even) {
    background-color: #F8FAFC;
}

.content-body blockquote {
    border-left: 4px solid var(--primary);
    padding: 0.75rem 1.25rem;
    margin: 1.5rem 0;
    background-color: #F8FAFC;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    font-style: italic;
    color: var(--text-secondary);
}

.content-body pre, .content-body code {
    background-color: #0F172A;
    color: #38BDF8;
    border-radius: var(--radius-sm);
    font-family: 'Fira Code', 'Courier New', monospace;
    font-size: 0.9rem;
}

.content-body pre {
    padding: 1rem;
    overflow-x: auto;
    margin: 1.25rem 0;
}

.content-body code {
    padding: 0.2rem 0.4rem;
}

.content-body ul, .content-body ol {
    margin-bottom: 1.25rem;
    padding-left: 1.75rem;
}

.content-body li {
    margin-bottom: 0.5rem;
}

.content-body a {
    color: var(--primary);
    text-decoration: underline;
    font-weight: 500;
}

.content-body a:hover {
    color: var(--primary-hover);
}

/* Summernote Editor AVA Custom Styling */
.note-editor.note-frame {
    border: 1px solid var(--border-color) !important;
    border-radius: var(--radius-md) !important;
    overflow: hidden;
    box-shadow: none !important;
    background: #FFFFFF !important;
}

.note-editor .note-toolbar {
    background-color: #F8FAFC !important;
    border-bottom: 1px solid var(--border-color) !important;
    padding: 6px 8px !important;
}

.note-editor .note-btn {
    border-radius: var(--radius-sm) !important;
    font-size: 0.8125rem !important;
    background-color: #FFFFFF !important;
    border: 1px solid #CBD5E1 !important;
    color: #334155 !important;
    padding: 0.35rem 0.55rem !important;
}

.note-editor .note-btn:hover, .note-editor .note-btn.active {
    background-color: var(--primary-50) !important;
    border-color: var(--primary-300) !important;
    color: var(--primary) !important;
}

.note-editor .note-editable {
    font-family: 'Inter', system-ui, sans-serif !important;
    font-size: 0.95rem !important;
    line-height: 1.7 !important;
    min-height: 280px;
    background-color: #FFFFFF !important;
    color: var(--text-primary) !important;
    padding: 1rem 1.25rem !important;
}

/* ==========================================================================
   Quill 2.0 & Image Resizer - AVA Design System
   ========================================================================== */
.ql-toolbar.ql-snow {
    border: 1px solid var(--border-color) !important;
    border-radius: var(--radius-md) var(--radius-md) 0 0 !important;
    background-color: #F8FAFC !important;
    padding: 8px 10px !important;
    font-family: 'Inter', sans-serif !important;
}

.ql-container.ql-snow {
    border: 1px solid var(--border-color) !important;
    border-top: none !important;
    border-radius: 0 0 var(--radius-md) var(--radius-md) !important;
    background-color: #FFFFFF !important;
    font-family: 'Inter', system-ui, sans-serif !important;
    font-size: 1rem !important;
    line-height: 1.75 !important;
}

.ql-editor {
    min-height: 320px !important;
    color: var(--text-primary) !important;
    padding: 1.25rem !important;
}

.ql-editor.ql-blank::before {
    color: #94A3B8 !important;
    font-style: normal !important;
    font-size: 0.95rem !important;
    left: 1.25rem !important;
    right: 1.25rem !important;
}

.ql-editor table {
    width: 100% !important;
    border-collapse: collapse;
    margin: 1.25rem 0;
}

.ql-editor table td, .ql-editor table th {
    border: 1px solid var(--border-color) !important;
    padding: 8px 12px !important;
}

.ql-editor table th {
    background-color: #F8FAFC !important;
    font-weight: 600;
}

.ql-editor img {
    max-width: 100%;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: outline 0.15s ease, box-shadow 0.15s ease;
    display: inline-block;
}

.ql-editor iframe.ql-video,
.ql-editor iframe {
    max-width: 100%;
    aspect-ratio: 16 / 9;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: outline 0.15s ease, box-shadow 0.15s ease;
    display: block;
    border: 0;
    background: #0F172A;
    margin: 1.25rem 0;
}

.ql-editor img.media-selected,
.ql-editor img.img-selected,
.ql-editor iframe.media-selected,
.ql-editor iframe.img-selected {
    outline: 3px solid var(--primary) !important;
    box-shadow: 0 0 0 5px rgba(79, 70, 229, 0.25) !important;
}

/* Media Resizer Overlay Controls (Image & Video) */
.media-resizer-toolbar,
.image-resizer-toolbar {
    position: absolute;
    background: #0F172A;
    color: #FFFFFF;
    padding: 6px 10px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    gap: 6px;
    z-index: 1060;
    box-shadow: var(--shadow-lg);
    font-size: 0.75rem;
    user-select: none;
}

.media-resizer-toolbar button,
.image-resizer-toolbar button {
    background: rgba(255,255,255,0.15);
    border: 1px solid rgba(255,255,255,0.25);
    color: #FFFFFF;
    border-radius: 4px;
    padding: 4px 8px;
    font-size: 0.75rem;
    cursor: pointer;
    transition: background 0.15s;
    display: inline-flex;
    align-items: center;
    gap: 3px;
}

.media-resizer-toolbar button:hover,
.image-resizer-toolbar button:hover {
    background: var(--primary);
    border-color: var(--primary);
}

.media-resizer-toolbar button.active,
.image-resizer-toolbar button.active {
    background: var(--primary);
    border-color: var(--primary);
    font-weight: bold;
}

/* Video Edit Overlay in Editor */
#quill-editor {
    position: relative !important;
}

.video-edit-overlay {
    position: absolute;
    background: rgba(15, 23, 42, 0.05);
    border: 2px dashed rgba(99, 102, 241, 0.5);
    border-radius: var(--radius-md, 8px);
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    padding: 8px 12px;
    cursor: pointer;
    z-index: 20;
    transition: all 0.15s ease;
    box-sizing: border-box;
    pointer-events: auto;
}

.video-edit-overlay:hover,
.video-edit-overlay.selected {
    background: rgba(99, 102, 241, 0.12);
    border-color: var(--primary, #4F46E5);
    border-style: solid;
    box-shadow: 0 0 0 4px rgba(79, 70, 229, 0.2);
}

.video-edit-overlay .video-badge {
    background: #0F172A;
    color: #FFFFFF;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 8px;
    border-radius: 4px;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    box-shadow: var(--shadow-sm);
    pointer-events: none;
}

/* ==========================================================================
   Modern Pagination
   ========================================================================== */
.pagination {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    margin-bottom: 0;
}

.page-item .page-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 2.25rem;
    height: 2.25rem;
    padding: 0 0.65rem;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text-primary);
    background-color: #FFFFFF;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: all var(--transition-fast);
}

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

.page-item.active .page-link {
    color: #FFFFFF;
    background-color: var(--primary);
    border-color: var(--primary);
    box-shadow: 0 2px 6px rgba(79, 70, 229, 0.25);
}

.page-item.disabled .page-link {
    color: #94A3B8;
    background-color: #F8FAFC;
    border-color: var(--border-color);
    cursor: not-allowed;
    pointer-events: none;
    opacity: 0.7;
}

.page-item-dots {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 1.75rem;
    height: 2.25rem;
    font-size: 0.875rem;
    font-weight: 700;
    color: #94A3B8;
    user-select: none;
}