:root {
    /* Color Palette */
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --secondary-color: #f3f4f6;
    --text-main: #1f2937;
    --text-muted: #6b7280;
    --bg-main: #f9fafb;
    --bg-surface: #ffffff;
    --border-color: #e5e7eb;
    
    /* Dimensions */
    --sidebar-width: 260px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    
    /* Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.5);
    --glass-blur: blur(10px);
}

/* Dark Mode Variables */
[data-theme="dark"], [data-bs-theme="dark"], [data-bs-theme="navy"] {
    --primary-color: #6366F1;
    --primary-hover: #4F46E5;
    --secondary-color: #2D2D2D;
    --text-main: #EDEDED;
    --text-secondary: #A1A1AA;
    --text-muted: #71717A;
    --bg-main: #121212;
    --bg-surface: #1E1E1E;
    --border-color: #3F3F46;
    --glass-bg: rgba(30, 30, 30, 0.9);
    --glass-border: rgba(63, 63, 70, 0.2);
    
    /* Bootstrap Overrides for Charcoal theme */
    --bs-body-bg: #121212;
    --bs-body-color: #EDEDED;
    --bs-primary: #6366F1;
    --bs-primary-rgb: 99,102,241;
    --bs-secondary: #2D2D2D;
    --bs-secondary-rgb: 45,45,45;
    --bs-secondary-color: #71717A;
    --bs-dark: #1E1E1E;
    --bs-dark-rgb: 30,30,30;
    --bs-light: #2D2D2D;
    --bs-light-rgb: 45,45,45;
    --bs-border-color: #3F3F46;
    --bs-component-bg: #1E1E1E;
}

/* Navy Mode Variables */
[data-theme="navy"], [data-bs-theme="navy"] {
    --primary-color: #6366F1;
    --primary-hover: #4F46E5;
    --secondary-color: #1E2640;
    --text-main: #F3F4F6;
    --text-secondary: #9CA3AF;
    --text-muted: #9CA3AF;
    --bg-main: #0B0F19;
    --bg-surface: #1E2640;
    --border-color: #2E3856;
    --glass-bg: rgba(30, 38, 64, 0.9);
    --glass-border: rgba(46, 56, 86, 0.2);
    
    /* Bootstrap Overrides for Navy theme */
    --bs-body-bg: #0B0F19;
    --bs-body-color: #F3F4F6;
    --bs-primary: #6366F1;
    --bs-primary-rgb: 99,102,241;
    --bs-secondary: #1E2640;
    --bs-secondary-rgb: 30,38,64;
    --bs-secondary-color: #9CA3AF;
    --bs-dark: #1E2640;
    --bs-dark-rgb: 30,38,64;
    --bs-light: #1E2640;
    --bs-light-rgb: 30,38,64;
    --bs-border-color: #2E3856;
    --bs-component-bg: #1E2640;
}

body {
    font-family: 'Inter', 'Hind', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Typography Enhancements */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    letter-spacing: -0.025em;
}

/* Layout Setup */
.sidebar {
    width: var(--sidebar-width);
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 999;
    background-color: var(--bg-surface);
    border-right: 1px solid var(--border-color);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
}

.main-content {
    margin-left: 0;
    transition: all 0.3s ease;
}

/* Sidebar Details */
.sidebar-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border-color);
}
.brand-link {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--text-main);
    font-weight: 700;
    font-size: 1.25rem;
}
.sidebar-menu {
    padding: 20px 12px;
    flex: 1;
    overflow-y: auto;
}
.sidebar-menu .nav-link {
    color: var(--text-muted);
    padding: 10px 12px;
    border-radius: 8px;
    margin-bottom: 4px;
    font-weight: 500;
    display: flex;
    align-items: center;
    transition: all 0.2s ease;
}
.sidebar-menu .nav-link i {
    margin-right: 12px;
    font-size: 1.1rem;
}
.sidebar-menu .nav-link:hover, .sidebar-menu .nav-link.active {
    background-color: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
}

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--border-color);
}
.user-profile {
    display: flex;
    align-items: center;
    padding: 8px;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.2s;
}
.user-profile:hover {
    background-color: var(--secondary-color);
}
.user-profile .avatar {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary-color), #818cf8);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    margin-right: 12px;
}
.user-info {
    display: flex;
    flex-direction: column;
}
.user-name {
    font-size: 0.875rem;
    font-weight: 600;
    line-height: 1.2;
}
.user-role {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Collapsed Sidebar Styles */
body.sidebar-collapsed .sidebar {
    width: 80px;
}
body.sidebar-collapsed .main-content {
    margin-left: 80px;
}
body.sidebar-collapsed .sidebar-header {
    padding: 20px 10px;
    display: flex;
    justify-content: center;
}
body.sidebar-collapsed .brand-link {
    justify-content: center;
}
body.sidebar-collapsed .brand-icon {
    margin-right: 0 !important;
}
body.sidebar-collapsed .brand-text,
body.sidebar-collapsed .sidebar-heading,
body.sidebar-collapsed .nav-text,
body.sidebar-collapsed .user-info,
body.sidebar-collapsed .logout-btn {
    display: none;
}
body.sidebar-collapsed .nav-link {
    justify-content: center;
    padding: 12px 10px;
}
body.sidebar-collapsed .nav-link i {
    margin-right: 0;
    font-size: 1.3rem;
}
body.sidebar-collapsed .sidebar-footer {
    padding: 16px 10px;
}
body.sidebar-collapsed .user-profile {
    justify-content: center;
}
body.sidebar-collapsed .user-profile .avatar {
    margin-right: 0;
}

/* Topbar Glassmorphism */
.topbar {
    background-color: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--glass-border);
    position: sticky;
    top: 0;
    z-index: 998;
    padding: 12px 24px;
}
.search-form {
    background-color: var(--secondary-color);
    border-radius: 20px;
    padding: 2px;
    width: 300px;
    border: 1px solid transparent;
    transition: all 0.2s ease;
}
.search-form:focus-within {
    background-color: var(--bg-surface);
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}
.search-form input:focus {
    box-shadow: none;
}
.nav-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    color: var(--text-muted);
    background-color: var(--secondary-color);
    transition: all 0.2s ease;
}
.nav-icon:hover {
    background-color: var(--border-color);
    color: var(--text-main);
}

/* Card Styles */
.card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    transition: transform 0.2s, box-shadow 0.2s;
}
.card-hover:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Buttons */
.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: #ffffff;
}
.btn-primary:hover, .btn-primary:focus {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
    color: #ffffff;
}

/* Responsive adjustments */
@media (max-width: 991.98px) {
    .sidebar {
        margin-left: calc(-1 * var(--sidebar-width));
    }
    .sidebar.active {
        margin-left: 0;
    }
    .main-content {
        margin-left: 0;
    }
}

/* Drag and Drop Cursors */
.cursor-grab {
    cursor: grab;
}
.cursor-grab:active {
    cursor: grabbing;
}
.question-block {
    cursor: grab;
}
.question-block:active {
    cursor: grabbing;
}

/* Tile Hover Animations */
.transition-all {
    transition: all 0.3s ease !important;
}

.hover-elevate {
    cursor: pointer;
}

.hover-elevate:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.08) !important;
}

/* Header / Navbar */
.landing-navbar {
    background: var(--bg-surface) !important;
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s ease;
    padding: 0.9rem 0;
    z-index: 1050;
}

.landing-navbar.scrolled {
    background: var(--glass-bg) !important;
    backdrop-filter: var(--glass-blur);
    box-shadow: 0 4px 20px -2px rgba(15, 23, 42, 0.06);
    padding: 0.75rem 0;
}

/* Footer */
.landing-footer {
    background: var(--bg-surface);
    color: var(--text-muted);
    padding: 1rem 0;
    border-top: 1px solid var(--border-color);
}

/* Specific adjustments for Charcoal dark mode */
[data-bs-theme="dark"], [data-bs-theme="navy"] .btn-primary {
    --bs-btn-bg: #6366F1;
    --bs-btn-border-color: #6366F1;
    --bs-btn-hover-bg: #4F46E5;
    --bs-btn-hover-border-color: #4F46E5;
    --bs-btn-color: #ffffff;
    --bs-btn-hover-color: #ffffff;
}
[data-bs-theme="dark"], [data-bs-theme="navy"] .text-primary {
    color: #6366F1 !important;
}
[data-bs-theme="dark"], [data-bs-theme="navy"] .bg-primary {
    background-color: #6366F1 !important;
    color: #ffffff !important;
}
[data-bs-theme="dark"], [data-bs-theme="navy"] .btn-outline-primary {
    --bs-btn-color: #6366F1;
    --bs-btn-border-color: #6366F1;
    --bs-btn-hover-bg: #6366F1;
    --bs-btn-hover-color: #ffffff;
}

[data-bs-theme="dark"], [data-bs-theme="navy"] .landing-navbar,
[data-bs-theme="dark"], [data-bs-theme="navy"] .landing-navbar.scrolled {
    background: #1E1E1E !important;
    border-bottom: 1px solid #3F3F46 !important;
    box-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.2);
}
[data-bs-theme="dark"], [data-bs-theme="navy"] .text-dark {
    color: #EDEDED !important;
}
[data-bs-theme="dark"], [data-bs-theme="navy"] .bg-light {
    background-color: #2D2D2D !important;
}

[data-bs-theme="dark"], [data-bs-theme="navy"] .bg-white {
    background-color: #1E1E1E !important;
}

[data-bs-theme="dark"], [data-bs-theme="navy"] .text-black {
    color: #EDEDED !important;
}

[data-bs-theme="dark"], [data-bs-theme="navy"] .text-muted {
    color: var(--text-muted) !important;
}

/* Pastel Glow Style Badges */
.icon-badge-academics { background: rgba(99, 102, 241, 0.15) !important; color: #818CF8 !important; }
.icon-badge-staff { background: rgba(245, 158, 11, 0.15) !important; color: #FBBF24 !important; }
.icon-badge-students { background: rgba(14, 165, 233, 0.15) !important; color: #38BDF8 !important; }
.icon-badge-calendar { background: rgba(244, 63, 94, 0.15) !important; color: #FB7185 !important; }
.icon-badge-leaderboard { background: rgba(234, 179, 8, 0.15) !important; color: #FDE047 !important; }
.icon-badge-logs { background: rgba(16, 185, 129, 0.15) !important; color: #34D399 !important; }
.icon-badge-exams { background: rgba(168, 85, 247, 0.15) !important; color: #C084FC !important; }

.icon-badge-academics i { color: #818CF8 !important; }
.icon-badge-staff i { color: #FBBF24 !important; }
.icon-badge-students i { color: #38BDF8 !important; }
.icon-badge-calendar i { color: #FB7185 !important; }
.icon-badge-leaderboard i { color: #FDE047 !important; }
.icon-badge-logs i { color: #34D399 !important; }
.icon-badge-exams i { color: #C084FC !important; }

/* Submenu CSS for multi-level dropdowns */
.dropdown-submenu {
    position: relative;
}
.dropdown-submenu > .dropdown-menu {
    top: 0;
    left: 100%;
    margin-top: -6px;
    margin-left: 0;
    border-radius: 0.5rem;
    display: none;
}
.dropdown-submenu:hover > .dropdown-menu {
    display: block;
}
@media (max-width: 991px) {
    .dropdown-submenu > .dropdown-menu {
        position: static;
        margin-left: 1.5rem;
        margin-top: 0;
        box-shadow: none !important;
        background: transparent;
        border: none;
        display: block;
    }
    .dropdown-submenu > a > .bi-chevron-right {
        display: none;
    }
}