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

/* Color Variables and Theme Defaults */
:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --primary-glow: rgba(99, 102, 241, 0.15);
    
    --secondary: #a855f7;
    --accent: #14b8a6;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    
    /* Dark Theme Variables (Default) */
    --bg-primary: #0b0f19;
    --bg-secondary: #111827;
    --bg-tertiary: #1f2937;
    
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    
    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.15);
    
    --glass-bg: rgba(17, 24, 39, 0.7);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-shadow: rgba(0, 0, 0, 0.4);
    
    --card-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    --glow-effect: 0 0 15px rgba(99, 102, 241, 0.25);
    
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-full: 9999px;
    
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme Variables */
[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    
    --border-color: rgba(0, 0, 0, 0.08);
    --border-hover: rgba(0, 0, 0, 0.15);
    
    --glass-bg: rgba(255, 255, 255, 0.75);
    --glass-border: rgba(0, 0, 0, 0.08);
    --glass-shadow: rgba(31, 38, 135, 0.08);
    
    --card-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.05);
    --glow-effect: 0 0 15px rgba(99, 102, 241, 0.1);
}

/* CSS Reset & General Rules */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    overflow-x: hidden;
    transition: background-color var(--transition-normal), color var(--transition-normal);
    line-height: 1.5;
}

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

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

button, input, select, textarea {
    font-family: inherit;
    font-size: inherit;
    color: inherit;
    background: none;
    border: none;
    outline: none;
}

/* App Wrapper Grid Layout */
.app-container {
    display: flex;
    min-height: 100vh;
    background: radial-gradient(circle at 10% 20%, rgba(99, 102, 241, 0.05) 0%, transparent 40%),
                radial-gradient(circle at 90% 80%, rgba(168, 85, 247, 0.05) 0%, transparent 40%);
}

/* Glassmorphism sidebar */
.sidebar {
    width: 260px;
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-right: 1px solid var(--glass-border);
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 100;
    transition: transform var(--transition-normal), width var(--transition-normal), background var(--transition-normal);
    box-shadow: var(--glass-shadow);
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 3rem;
    padding-left: 0.5rem;
}

.sidebar-logo-icon {
    width: 38px;
    height: 38px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 800;
    font-size: 1.25rem;
    box-shadow: var(--glow-effect);
}

.sidebar-logo-text {
    font-family: 'Outfit', sans-serif;
    font-size: 1.35rem;
    font-weight: 800;
    background: linear-gradient(to right, var(--text-primary), var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.sidebar-menu {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    flex-grow: 1;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.85rem 1rem;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-weight: 500;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.sidebar-link:hover {
    color: var(--text-primary);
    background: var(--border-color);
    transform: translateX(4px);
}

.sidebar-link.active {
    color: white;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    box-shadow: var(--glow-effect);
}

.sidebar-link svg {
    width: 20px;
    height: 20px;
    transition: transform var(--transition-fast);
}

.sidebar-link:hover svg {
    transform: scale(1.1);
}

/* User identity in sidebar footer */
.sidebar-user {
    border-top: 1px solid var(--border-color);
    padding-top: 1.5rem;
    margin-top: auto;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.user-avatar {
    width: 42px;
    height: 42px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, var(--secondary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    box-shadow: 0 4px 10px rgba(0,0,0,0.2);
}

.user-info {
    flex-grow: 1;
    overflow: hidden;
}

.user-name {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    text-overflow: ellipsis;
    overflow: hidden;
}

.user-role {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: capitalize;
}

.btn-logout {
    color: var(--text-muted);
    cursor: pointer;
    transition: color var(--transition-fast);
}

.btn-logout:hover {
    color: var(--danger);
}

/* Main Workspace Content Panel */
.main-content {
    flex-grow: 1;
    margin-left: 260px;
    padding: 2rem 2.5rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    transition: margin-left var(--transition-normal);
}

/* Header Topbar components */
.header-topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.page-title {
    font-size: 1.85rem;
    font-weight: 800;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.theme-toggle {
    width: 42px;
    height: 42px;
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    color: var(--text-primary);
    border-color: var(--border-hover);
    background: var(--border-color);
    transform: translateY(-2px);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
}

/* Notification Button */
.notifications-btn {
    position: relative;
    width: 42px;
    height: 42px;
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.notifications-btn:hover {
    color: var(--text-primary);
    border-color: var(--border-hover);
    background: var(--border-color);
    transform: translateY(-2px);
}

.notifications-btn::after {
    content: '';
    position: absolute;
    top: 10px;
    right: 10px;
    width: 8px;
    height: 8px;
    border-radius: var(--radius-full);
    background-color: var(--danger);
    box-shadow: 0 0 0 2px var(--bg-secondary);
}

/* Stat Cards & Grid Layouts */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 1.5rem;
}

.stat-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1.25rem;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    box-shadow: var(--card-shadow);
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--primary);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.stat-card:hover {
    transform: translateY(-5px);
    border-color: var(--border-hover);
    box-shadow: 0 12px 40px rgba(0,0,0,0.15);
}

.stat-card:hover::before {
    opacity: 1;
}

.stat-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-md);
    background: var(--primary-glow);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.stat-icon.secondary {
    background: rgba(168, 85, 247, 0.15);
    color: var(--secondary);
}

.stat-icon.success {
    background: rgba(16, 185, 129, 0.15);
    color: var(--success);
}

.stat-icon.warning {
    background: rgba(245, 158, 11, 0.15);
    color: var(--warning);
}

.stat-info {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-family: 'Outfit', sans-serif;
    font-size: 1.75rem;
    font-weight: 800;
    line-height: 1.2;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Beautiful Interactive Glass Cards */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--glass-shadow);
    transition: border var(--transition-fast), background var(--transition-normal);
}

.glass-card.interactive:hover {
    border-color: var(--border-hover);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.card-title {
    font-size: 1.25rem;
    font-weight: 700;
}

/* General Layout Grids */
.dashboard-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 1.5rem;
}

@media (max-width: 1024px) {
    .dashboard-grid {
        grid-template-columns: 1fr;
    }
}

/* Tables Styling */
.table-wrapper {
    overflow-x: auto;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.custom-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
    background: var(--bg-secondary);
}

.custom-table th {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.875rem;
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.custom-table td {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
    font-size: 0.875rem;
}

.custom-table tr:last-child td {
    border-bottom: none;
}

.custom-table tbody tr {
    transition: background-color var(--transition-fast);
}

.custom-table tbody tr:hover {
    background-color: var(--border-color);
}

/* Badge Styles */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: capitalize;
}

.badge-primary { background: var(--primary-glow); color: var(--primary); }
.badge-secondary { background: rgba(168, 85, 247, 0.15); color: var(--secondary); }
.badge-success { background: rgba(16, 185, 129, 0.15); color: var(--success); }
.badge-warning { background: rgba(245, 158, 11, 0.15); color: var(--warning); }
.badge-danger { background: rgba(239, 68, 68, 0.15); color: var(--danger); }

/* Buttons Custom Styles */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    justify-content: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    box-shadow: var(--glow-effect);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: var(--border-color);
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.btn-danger {
    background: var(--danger);
    color: white;
}

.btn-danger:hover {
    background: #dc2626;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(239, 68, 68, 0.3);
}

.btn-sm {
    padding: 0.45rem 0.85rem;
    font-size: 0.825rem;
    border-radius: var(--radius-sm);
}

/* Beautiful Form controls */
.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
}

.form-label {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.form-control {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    transition: all var(--transition-fast);
    width: 100%;
}

.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

/* Course Listing & Cards */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.course-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: all var(--transition-normal);
    box-shadow: var(--card-shadow);
}

.course-card:hover {
    transform: translateY(-6px);
    border-color: var(--border-hover);
    box-shadow: 0 12px 35px rgba(0,0,0,0.18);
}

.course-thumb {
    height: 160px;
    width: 100%;
    object-fit: cover;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
}

.course-body {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    flex-grow: 1;
}

.course-category {
    font-size: 0.75rem;
    color: var(--primary);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.course-title {
    font-size: 1.15rem;
    font-weight: 700;
    line-height: 1.4;
}

.course-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.course-footer {
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
}

.course-instructor {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* Authentications Styles (Login/Register Panels) */
.auth-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at 20% 30%, rgba(99, 102, 241, 0.07) 0%, transparent 50%),
                radial-gradient(circle at 80% 70%, rgba(168, 85, 247, 0.07) 0%, transparent 50%),
                var(--bg-primary);
    padding: 1.5rem;
}

.auth-card {
    width: 100%;
    max-width: 440px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    box-shadow: var(--glass-shadow);
}

.auth-header {
    text-align: center;
    margin-bottom: 2rem;
}

.auth-logo {
    display: inline-flex;
    margin-bottom: 1.25rem;
}

.auth-title {
    font-size: 1.65rem;
    margin-bottom: 0.5rem;
}

.auth-subtitle {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.auth-alert {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: var(--danger);
    border-radius: var(--radius-md);
    padding: 0.75rem 1rem;
    font-size: 0.85rem;
    margin-bottom: 1.5rem;
}

.auth-success {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.2);
    color: var(--success);
    border-radius: var(--radius-md);
    padding: 0.75rem 1rem;
    font-size: 0.85rem;
    margin-bottom: 1.5rem;
}

.auth-footer {
    text-align: center;
    margin-top: 1.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.auth-link {
    color: var(--primary);
    font-weight: 600;
}

.auth-link:hover {
    color: var(--secondary);
}

/* Custom SVG Charts styles */
.chart-container {
    height: 220px;
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    padding-top: 2rem;
    padding-bottom: 1rem;
    gap: 1rem;
}

.chart-bar-wrapper {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    height: 100%;
    justify-content: flex-end;
    gap: 0.5rem;
}

.chart-bar-track {
    width: 24px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    height: 100%;
    display: flex;
    align-items: flex-end;
    overflow: hidden;
}

.chart-bar-fill {
    width: 100%;
    background: linear-gradient(to top, var(--primary), var(--secondary));
    border-radius: var(--radius-full);
    transition: height 1s cubic-bezier(0.4, 0, 0.2, 1);
    height: 0; /* JS handles this animation setting height */
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.2);
}

.chart-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Classroom UI Components */
.classroom-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 1.5rem;
    flex-grow: 1;
}

@media (max-width: 900px) {
    .classroom-layout {
        grid-template-columns: 1fr;
    }
}

.classroom-sidebar {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    height: calc(100vh - 120px);
    position: sticky;
    top: 20px;
}

.classroom-sidebar-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-tertiary);
}

.classroom-sidebar-title {
    font-size: 1rem;
    font-weight: 700;
}

.classroom-nav {
    overflow-y: auto;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    flex-grow: 1;
}

.classroom-module-title {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.classroom-lessons-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.classroom-lesson-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.65rem 0.85rem;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.classroom-lesson-item:hover {
    background: var(--border-color);
    color: var(--text-primary);
}

.classroom-lesson-item.active {
    background: var(--primary-glow);
    color: var(--primary);
    font-weight: 600;
}

.classroom-lesson-item svg {
    width: 16px;
    height: 16px;
}

/* Classroom Main Content Player */
.classroom-player {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.video-container {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
    height: 0;
    overflow: hidden;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--card-shadow);
    background: #000;
}

.video-container iframe, .video-container video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.lesson-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
}

.lesson-content-text {
    font-size: 1rem;
    color: var(--text-primary);
    line-height: 1.7;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 2rem;
    border-radius: var(--radius-lg);
}

/* Employee Portal Widget Styling */
.clock-widget {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, rgba(99, 102, 241, 0.04) 100%);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    box-shadow: var(--card-shadow);
}

.clock-timer {
    font-family: 'Outfit', sans-serif;
    font-size: 2.25rem;
    font-weight: 800;
    background: linear-gradient(to right, var(--text-primary), var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin: 0.5rem 0;
}

.recent-activity-item {
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}

.recent-activity-item:last-child {
    border-bottom: none;
}

.activity-circle {
    width: 8px;
    height: 8px;
    border-radius: var(--radius-full);
    margin-top: 6px;
    flex-shrink: 0;
}

.activity-content {
    font-size: 0.85rem;
}

.activity-title {
    font-weight: 600;
    margin-bottom: 0.15rem;
}

.activity-time {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Popup Notifications Toast */
.toast-container {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    z-index: 1000;
}

.toast {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    padding: 1rem 1.5rem;
    border-radius: var(--radius-md);
    box-shadow: var(--glass-shadow);
    color: var(--text-primary);
    font-size: 0.875rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transform: translateY(100px);
    opacity: 0;
    animation: slideIn 0.3s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes slideIn {
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* Mobile Sidebar Drawer Toggles */
.sidebar-toggle {
    display: none;
    width: 42px;
    height: 42px;
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
        padding: 1.5rem;
    }
    
    .sidebar-toggle {
        display: flex;
    }
}

/* --- LMS Premium Feature Extensions --- */

/* 1. Course Builder & Curriculum Manager Modals */
.builder-btn-group {
    display: flex;
    gap: 0.5rem;
    margin-top: 0.5rem;
}
.builder-action-btn {
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
    border-radius: var(--radius-sm);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}
.builder-action-btn:hover {
    color: var(--text-primary);
    border-color: var(--border-hover);
    background: var(--border-color);
}
.builder-action-btn.delete:hover {
    background: rgba(239, 68, 68, 0.15);
    color: var(--danger);
    border-color: rgba(239, 68, 68, 0.3);
}

.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
}
.modal-backdrop.active {
    display: flex;
}
.builder-modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    width: 100%;
    max-width: 500px;
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--card-shadow);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    position: relative;
    animation: modalSlide 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}
@keyframes modalSlide {
    from { transform: translateY(30px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

/* 2. Interactive MCQ Quiz System */
.quiz-container {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    box-shadow: var(--card-shadow);
}
.quiz-question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
}
.quiz-options-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}
.quiz-option-btn {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1rem 1.25rem;
    text-align: left;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 1rem;
    width: 100%;
}
.quiz-option-btn:hover:not(:disabled) {
    border-color: var(--primary);
    background: var(--primary-glow);
    transform: translateX(4px);
}
.quiz-option-btn.selected {
    border-color: var(--secondary);
    background: rgba(168, 85, 247, 0.15);
}
.quiz-option-btn.correct {
    border-color: var(--success);
    background: rgba(16, 185, 129, 0.15);
    color: white;
}
.quiz-option-btn.incorrect {
    border-color: var(--danger);
    background: rgba(239, 68, 68, 0.15);
    color: white;
}
.option-letter {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-sm);
    background: var(--bg-tertiary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.85rem;
    flex-shrink: 0;
}
.quiz-option-btn.selected .option-letter {
    background: var(--secondary);
    color: white;
}
.quiz-option-btn.correct .option-letter {
    background: var(--success);
    color: white;
}
.quiz-option-btn.incorrect .option-letter {
    background: var(--danger);
    color: white;
}

/* 3. Certificate of Completion Overlay & Card */
.certificate-trigger-panel {
    background: linear-gradient(135deg, rgba(245, 158, 11, 0.12) 0%, rgba(99, 102, 241, 0.12) 100%);
    border: 1px solid rgba(245, 158, 11, 0.3);
    border-radius: var(--radius-lg);
    padding: 1.5rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 1rem;
}
.certificate-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(11, 15, 25, 0.95);
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
    overflow-y: auto;
    padding: 2rem;
}
.certificate-backdrop.active {
    display: flex;
}
.certificate-card {
    background: #0f172a;
    border: 10px double rgba(245, 158, 11, 0.4);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 850px;
    aspect-ratio: 1.414 / 1; /* Standard A4 landscape ratio */
    padding: 3rem 4rem;
    box-shadow: 0 25px 60px rgba(0,0,0,0.8), 0 0 40px rgba(245, 158, 11, 0.15);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    text-align: center;
    position: relative;
    color: #e2e8f0;
    overflow: hidden;
}
.certificate-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, transparent 30%, rgba(0,0,0,0.5) 80%);
    pointer-events: none;
}
.certificate-logo {
    font-family: 'Outfit', sans-serif;
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--warning);
    letter-spacing: 0.1em;
}
.certificate-title {
    font-family: 'Outfit', sans-serif;
    font-size: 2.75rem;
    font-weight: 800;
    background: linear-gradient(to right, #fbbf24, #f59e0b, #d97706);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: 0.5rem;
}
.certificate-recipient-name {
    font-family: 'Outfit', sans-serif;
    font-size: 2.25rem;
    font-weight: 700;
    color: white;
    border-bottom: 2px solid rgba(245, 158, 11, 0.3);
    padding-bottom: 0.5rem;
    margin: 1.5rem 0 0.5rem 0;
    display: inline-block;
    min-width: 300px;
}
.certificate-details-text {
    font-size: 1rem;
    color: #94a3b8;
    max-width: 550px;
    line-height: 1.6;
}
.certificate-seal {
    width: 90px;
    height: 90px;
    border-radius: var(--radius-full);
    border: 3px double #f59e0b;
    background: radial-gradient(circle, rgba(245, 158, 11, 0.2) 0%, transparent 80%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fbbf24;
    font-weight: 800;
    font-size: 0.85rem;
    text-transform: uppercase;
    box-shadow: 0 0 15px rgba(245, 158, 11, 0.3);
    transform: rotate(-15deg);
    margin-bottom: 0.5rem;
}
.certificate-signatures {
    display: flex;
    justify-content: space-between;
    width: 100%;
    margin-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.08);
    padding-top: 1.5rem;
}
.signature-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}
.signature-line {
    font-family: 'Outfit', sans-serif;
    font-size: 0.95rem;
    font-weight: 600;
    color: #e2e8f0;
}
.signature-title {
    font-size: 0.75rem;
    color: #64748b;
    text-transform: uppercase;
}
.certificate-serial-code {
    position: absolute;
    bottom: 1.5rem;
    font-family: monospace;
    font-size: 0.7rem;
    color: #475569;
}

/* Printing styles for Certificates */
@media print {
    body * {
        visibility: hidden;
    }
    .certificate-backdrop, .certificate-backdrop * {
        visibility: visible;
    }
    .certificate-backdrop {
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        height: 100%;
        background: white !important;
        padding: 0;
        display: flex !important;
        align-items: center;
        justify-content: center;
    }
    .certificate-card {
        border: 12px double #f59e0b !important;
        box-shadow: none !important;
        background: #0f172a !important;
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
        width: 100% !important;
        max-width: 100% !important;
        aspect-ratio: 1.414 / 1 !important;
        transform: none !important;
        margin: 0 !important;
    }
    .close-cert-btn {
        display: none !important;
    }
}

/* 4. Circular Progress & Gradebook Components */
.circular-progress {
    position: relative;
    width: 120px;
    height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.circular-progress svg {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}
.circular-progress circle {
    fill: none;
    stroke-width: 8;
    stroke-linecap: round;
}
.circular-progress .bg-circle {
    stroke: var(--bg-tertiary);
}
.circular-progress .progress-circle {
    stroke: url(#progressGradient);
    transition: stroke-dashoffset 1s ease;
}
.progress-value-center {
    position: absolute;
    font-family: 'Outfit', sans-serif;
    font-size: 1.5rem;
    font-weight: 800;
}