:root {
    /* Global Sizing & Spacing System */
    --radius: 12px;
    --radius-sm: 8px;
    --sidebar-width: 250px;
    --header-height: 70px;
    
    /* Typography System */
    --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-size-base: 14px;
    --font-size-sm: 12px;
    --font-size-lg: 16px;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --shadow-neon: 0 4px 15px rgba(139, 92, 246, 0.25);
    
    /* Transitions */
    --theme-transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

[data-bs-theme="light"] {
    --bg-main: #F5F7FB;
    --bg-sidebar: #FFFFFF;
    --bg-surface: #FFFFFF;
    --bg-surface-hover: #F8FAFC;
    --bg-input: #FFFFFF;
    
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-muted: #64748B;
    
    --border: #E2E8F0;
    
    --primary: #4F46E5;
    --primary-blue: #3B82F6;
    --primary-hover: #4338CA;
    
    --success: #16A34A;
    --warning: #D97706;
    --danger: #DC2626;
    --info: #0284C7;
    
    --gradient-primary: linear-gradient(135deg, var(--primary) 0%, var(--primary-blue) 100%);
}

[data-bs-theme="dark"] {
    --bg-main: #0B1020;
    --bg-sidebar: #0A0F1C;
    --bg-surface: #111827;
    --bg-surface-hover: #172033;
    --bg-input: #0F172A;
    
    --text-primary: #F8FAFC;
    --text-secondary: #CBD5E1;
    --text-muted: #94A3B8;
    
    --border: #243044;
    
    --primary: #8B5CF6;
    --primary-blue: #3B82F6;
    --primary-hover: #7C3AED;
    
    --success: #22C55E;
    --warning: #F59E0B;
    --danger: #EF4444;
    --info: #06B6D4;
    
    --gradient-primary: linear-gradient(135deg, var(--primary) 0%, var(--primary-blue) 100%);
}

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    overflow-x: hidden;
    transition: var(--theme-transition);
}

/* Base Elements */
a { color: var(--primary-blue); text-decoration: none; }
a:hover { color: var(--primary); }

/* Layout Shell */
.lms-sidebar {
    transition: var(--theme-transition);
    width: var(--sidebar-width);
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    z-index: 1040;
    transition: transform 0.3s ease-in-out;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.lms-main-content {
    margin-left: var(--sidebar-width);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: margin-left 0.3s ease-in-out;
}

.lms-header {
    transition: var(--theme-transition);
    background-color: transparent;
    height: 70px;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 1030;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(36, 48, 68, 0.5);
}

.lms-page-header {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0;
    color: var(--text-primary);
}

/* Sidebar Elements */
.lms-brand {
    padding: 1.5rem 1.5rem;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}
.lms-brand:hover { color: var(--text-primary); }

.lms-nav-heading {
    padding: 1.5rem 1.5rem 0.5rem;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    font-weight: 600;
}

.lms-nav-item {
    color: var(--text-secondary);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-sm);
    margin: 0.2rem 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    transition: all 0.2s;
    font-size: 0.95rem;
    font-weight: 500;
}

.lms-nav-item:hover {
    color: var(--text-primary);
    background-color: var(--bg-surface-hover);
}

.lms-nav-item.active {
    background: var(--gradient-primary);
    color: #ffffff;
    box-shadow: var(--shadow-neon);
}

.lms-nav-item i { width: 20px; text-align: center; font-size: 1.1rem; }

.lms-sidebar-user {
    margin-top: auto;
    padding: 1rem;
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.lms-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    color: #fff;
}

/* Cards */
.lms-card {
    transition: var(--theme-transition);
    background-color: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow-sm);
}

.lms-card-header {
    transition: var(--theme-transition);
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border);
    color: var(--text-primary);
    font-weight: 600;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.lms-card-body { padding: 1.5rem; }

/* Buttons */
.lms-btn {
    border-radius: var(--radius-sm);
    padding: 0.5rem 1rem;
    font-weight: 500;
    transition: all 0.2s;
    border: none;
    display: inline-block;
    cursor: pointer;
    text-align: center;
}

.lms-btn-primary {
    background: var(--gradient-primary);
    color: white;
}
.lms-btn-primary:hover {
    box-shadow: var(--shadow-neon);
    color: white;
    transform: translateY(-1px);
}

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

.lms-btn-danger {
    background-color: rgba(239, 68, 68, 0.15);
    color: var(--danger);
    border: 1px solid transparent;
}
.lms-btn-danger:hover {
    background-color: var(--danger);
    color: white;
}

/* Forms */
.lms-form-label {
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0.4rem;
    display: block;
}

.lms-form-control {
    background-color: var(--bg-input);
    border: 1px solid var(--border);
    color: var(--text-primary);
    border-radius: var(--radius-sm);
    padding: 0.6rem 1rem;
    transition: all 0.2s;
    width: 100%;
    display: block;
}
.lms-form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(139, 92, 246, 0.25);
    background-color: var(--bg-input);
    color: var(--text-primary);
}
.lms-form-control.is-unique-ok,
.form-control.is-unique-ok {
    border-color: #22c55e;
    padding-right: 2.5rem;
}
.lms-form-control.is-unique-taken,
.form-control.is-unique-taken {
    border-color: #ef4444;
    padding-right: 2.5rem;
}
.unique-check-icon {
    position: absolute;
    right: 0.75rem;
    top: 2.35rem;
    font-size: 1.2rem;
    pointer-events: none;
    line-height: 1;
}
.unique-check-icon-slug {
    right: 7.25rem;
}
.unique-check-icon-email {
    right: 7.75rem;
}
.unique-check-icon.is-ok { color: #22c55e; }
.unique-check-icon.is-taken { color: #ef4444; }

/* Tables */
.lms-table-container {
    width: 100%;
    overflow-x: auto;
}

.lms-table {
    width: 100%;
    color: var(--text-secondary);
    border-collapse: collapse;
}
.lms-table th {
    background-color: transparent;
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 1rem;
    border-bottom: 1px solid var(--border);
    text-align: left;
}
.lms-table td {
    padding: 1rem;
    border-bottom: 1px solid rgba(36, 48, 68, 0.5);
    vertical-align: middle;
}
.lms-table tbody tr {
    transition: background-color 0.2s;
}
.lms-table tbody tr:hover {
    background-color: var(--bg-surface-hover);
}
.lms-table tbody tr:hover td {
    color: var(--text-primary);
}

/* Badges */
.lms-badge {
    padding: 0.4rem 0.6rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
    display: inline-block;
}
.lms-badge-success { background-color: rgba(34, 197, 94, 0.15); color: var(--success); }
.lms-badge-warning { background-color: rgba(245, 158, 11, 0.15); color: var(--warning); }
.lms-badge-danger { background-color: rgba(239, 68, 68, 0.15); color: var(--danger); }
.lms-badge-primary { background-color: rgba(139, 92, 246, 0.15); color: var(--primary); }

/* Mobile Sidebar Overlay */
#sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0,0,0,0.7);
    z-index: 1035;
    display: none;
}

@media (max-width: 991.98px) {
    .lms-sidebar {
    transition: var(--theme-transition); transform: translateX(-100%); }
    .lms-sidebar.show { transform: translateX(0); }
    .lms-main-content { margin-left: 0; }
    .lms-header {
    transition: var(--theme-transition); padding: 0 1rem; }
    #sidebar-overlay.show { display: block; }
}

/* Bootstrap Overrides for structural elements */
.alert {
    background-color: var(--bg-surface);
    border: 1px solid var(--border);
    color: var(--text-primary);
}
.alert-success { border-left: 4px solid var(--success); }
.alert-danger { border-left: 4px solid var(--danger); }
.alert-warning { border-left: 4px solid var(--warning); }
.alert-info { border-left: 4px solid var(--info); }
.btn-close { filter: invert(1) grayscale(100%) brightness(200%); }

/* Ensure modal contents use dark theme */
.modal-content {
    transition: var(--theme-transition);
    background-color: var(--bg-surface);
    color: var(--text-primary);
    border: 1px solid var(--border);
}
.modal-header {
    border-bottom: 1px solid var(--border);
}
.modal-footer {
    border-top: 1px solid var(--border);
}

/* UI Customization Modifiers */

/* Density */
[data-density="compact"] .lms-card-body,
[data-density="compact"] .lms-card-header {
    padding: 1rem !important;
}
[data-density="compact"] .lms-table td, 
[data-density="compact"] .lms-table th { 
    padding: 0.5rem !important; 
}
[data-density="compact"] .lms-form-control {
    padding: 0.4rem 0.8rem !important;
}

[data-density="spacious"] .lms-card-body,
[data-density="spacious"] .lms-card-header {
    padding: 2rem !important;
}
[data-density="spacious"] .lms-table td, 
[data-density="spacious"] .lms-table th { 
    padding: 1.25rem !important; 
}
[data-density="spacious"] .lms-form-control {
    padding: 0.8rem 1.2rem !important;
}

/* Sidebar Mini */
body.sidebar-mini .lms-sidebar {
    width: 70px;
}
body.sidebar-mini .lms-main-content {
    margin-left: 70px;
}
@media (max-width: 991.98px) {
    body.sidebar-mini .lms-main-content {
        margin-left: 0;
    }
}
body.sidebar-mini .lms-sidebar .lms-brand span,
body.sidebar-mini .lms-sidebar .lms-brand div {
    display: none !important;
}
body.sidebar-mini .lms-sidebar .lms-nav-heading {
    display: none !important;
}
body.sidebar-mini .lms-sidebar .lms-sidebar-user .flex-grow-1 {
    display: none !important;
}
body.sidebar-mini .lms-sidebar .lms-nav-item {
    font-size: 0 !important;
    justify-content: center !important;
    padding-left: 0 !important;
    padding-right: 0 !important;
}
body.sidebar-mini .lms-sidebar .lms-nav-item i {
    font-size: 1.25rem !important;
}

/* Visual Effects Toggles */
[data-effects-shadows="false"] .lms-card, 
[data-effects-shadows="false"] .lms-nav-item.active {
    box-shadow: none !important;
}

[data-effects-gradients="false"] .lms-nav-item.active,
[data-effects-gradients="false"] .lms-btn-primary,
[data-effects-gradients="false"] .lms-avatar {
    background: var(--primary) !important;
    background-image: none !important;
}

[data-effects-animations="false"] *, 
[data-effects-animations="false"] *::before, 
[data-effects-animations="false"] *::after {
    transition: none !important;
    animation: none !important;
}

[data-effects-glow="false"] .lms-nav-item.active,
[data-effects-glow="false"] .lms-btn-primary:hover {
    box-shadow: none !important;
}

/* Public marketing / landing */
.landing-body {
    background: #f8fafc;
    color: #0f172a;
}
.landing-nav {
    background: #fff;
    box-shadow: 0 1px 0 rgba(15, 23, 42, 0.06);
}
.landing-nav .navbar-brand {
    letter-spacing: -0.02em;
    color: #0f172a;
}
.landing-nav .nav-link {
    color: #475569;
    font-weight: 500;
}
.landing-nav .nav-link:hover,
.landing-nav .nav-link:focus {
    color: #4f46e5;
}
.landing-hero {
    background: linear-gradient(180deg, #eef2ff 0%, #f8fafc 55%, #f8fafc 100%);
    border-bottom: 1px solid #e2e8f0;
}
.landing-kicker {
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.75rem;
    font-weight: 600;
    color: #4f46e5;
}
.landing-title {
    font-size: clamp(1.85rem, 4vw, 2.75rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.2;
    color: #0f172a;
}
.landing-lead {
    font-size: 1.05rem;
    line-height: 1.65;
    max-width: 38rem;
}
.landing-section {
    padding: 4rem 0;
}
.landing-muted {
    background: #fff;
    border-top: 1px solid #e2e8f0;
    border-bottom: 1px solid #e2e8f0;
}
.landing-value,
.landing-card,
.landing-step {
    background: #fff;
    border: 1px solid #e2e8f0;
    border-radius: 12px;
    padding: 1.25rem 1.35rem;
    box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
    height: 100%;
}
.landing-muted .landing-card {
    background: #f8fafc;
}
.landing-value i,
.landing-card i {
    font-size: 1.35rem;
    color: #4f46e5;
}
.landing-step span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    border-radius: 999px;
    background: #eef2ff;
    color: #4338ca;
    font-weight: 700;
    font-size: 0.9rem;
}
.landing-list {
    padding-left: 1.1rem;
    margin-bottom: 0;
    color: #475569;
}
.landing-list li {
    margin-bottom: 0.55rem;
}
.landing-cta {
    background: #0f172a;
    color: #e2e8f0;
}
.landing-cta h2 {
    color: #fff;
}
.landing-cta .text-muted {
    color: #94a3b8 !important;
}
.landing-cta .btn-outline-secondary {
    color: #fff;
    border-color: #64748b;
}
.landing-cta .btn-outline-secondary:hover {
    background: #1e293b;
    color: #fff;
    border-color: #94a3b8;
}
.landing-footer {
    background: #fff;
    border-top: 1px solid #e2e8f0;
    color: #475569;
}
.landing-footer a {
    color: #334155;
    text-decoration: none;
}
.landing-footer a:hover {
    color: #4f46e5;
    text-decoration: underline;
}
.landing-legal {
    max-width: 46rem;
}
.landing-dash {
    background: #fff;
    border: 1px solid #e2e8f0;
    border-radius: 14px;
    overflow: hidden;
    box-shadow: 0 16px 40px rgba(15, 23, 42, 0.08);
}
.landing-dash-bar {
    display: flex;
    gap: 6px;
    padding: 0.7rem 1rem;
    background: #f1f5f9;
    border-bottom: 1px solid #e2e8f0;
}
.landing-dash-bar span {
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: #cbd5e1;
}
.landing-dash-body {
    display: grid;
    grid-template-columns: 8.5rem 1fr;
    min-height: 16rem;
}
.landing-dash-body aside {
    background: #0f172a;
    color: #94a3b8;
    padding: 1rem 0.85rem;
    font-size: 0.8rem;
}
.landing-dash-brand {
    color: #fff;
    font-weight: 600;
    margin-bottom: 0.85rem;
}
.landing-dash-body aside .active {
    color: #c7d2fe;
    background: rgba(79, 70, 229, 0.25);
    margin: 0 -0.4rem;
    padding: 0.35rem 0.55rem;
    border-radius: 6px;
}
.landing-dash-body aside div:not(.landing-dash-brand):not(.active) {
    padding: 0.35rem 0.15rem;
}
.landing-dash-main {
    padding: 1rem;
}
.landing-dash-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.6rem;
    margin-bottom: 1rem;
}
.landing-dash-stats div {
    background: #f8fafc;
    border: 1px solid #e2e8f0;
    border-radius: 8px;
    padding: 0.55rem 0.65rem;
}
.landing-dash-stats small {
    display: block;
    color: #64748b;
    font-size: 0.7rem;
}
.landing-dash-stats strong {
    font-size: 0.85rem;
}
.landing-dash-main table {
    width: 100%;
    font-size: 0.8rem;
    border-collapse: collapse;
}
.landing-dash-main th,
.landing-dash-main td {
    text-align: left;
    padding: 0.4rem 0.2rem;
    border-bottom: 1px solid #e2e8f0;
    color: #475569;
}
.landing-dash-caption {
    margin-top: 0.75rem;
    font-size: 0.75rem;
    color: #64748b;
}
@media (max-width: 575.98px) {
    .landing-dash-body {
        grid-template-columns: 1fr;
    }
    .landing-dash-body aside {
        display: flex;
        flex-wrap: wrap;
        gap: 0.35rem 0.75rem;
        align-items: center;
    }
    .landing-dash-brand {
        width: 100%;
        margin-bottom: 0.25rem;
    }
    .landing-dash-stats {
        grid-template-columns: 1fr;
    }
    .landing-section {
        padding: 2.5rem 0;
    }
}

.password-policy li { margin-bottom: 0.2rem; }
.password-policy i { margin-right: 0.35rem; }