:root, [data-bs-theme="light"] {
    --primary-color: #1e40af;
    --primary-hover: #1d4ed8;
    --secondary-color: #0f172a;
    --bg-light: #f8fafc;
    --card-border: #cbd5e1;
    
    /* UTTMS Dynamic Multi-Theme Tokens (High Contrast) */
    --uttms-bg-body: #f8fafc;
    --uttms-bg-surface: #ffffff;
    --uttms-bg-surface-elevated: #f1f5f9;
    --uttms-bg-card: #ffffff;
    --uttms-border-color: #cbd5e1;
    --uttms-border-subtle: #e2e8f0;
    --uttms-text-primary: #0f172a;     /* Deepest rich dark for 100% legibility */
    --uttms-text-secondary: #1e293b;   /* Very clear, crisp body text */
    --uttms-text-muted: #475569;       /* High-contrast readable secondary text */
    --uttms-navbar-bg: #0f172a;
    --uttms-navbar-text: #ffffff;
    --uttms-sidebar-bg: #ffffff;
    --uttms-sidebar-border: #cbd5e1;
    --uttms-input-bg: #ffffff;
    --uttms-input-border: #94a3b8;
    --uttms-table-head-bg: #e2e8f0;
    --uttms-table-border: #cbd5e1;
    --uttms-table-stripe: #f8fafc;
    --uttms-table-hover: #e0e7ff;
    --uttms-slot-bg: #ffffff;
    --uttms-slot-border: #94a3b8;
    --uttms-shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.08);
    --uttms-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.06);
    --uttms-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.12), 0 4px 6px -4px rgba(0, 0, 0, 0.06);
    --uttms-shadow-glow: 0 0 15px rgba(37, 99, 235, 0.2);
    --uttms-dive-bg: #ffffff;
    --uttms-dive-header-bg: #f1f5f9;
    --uttms-bottom-bar-bg: rgba(255, 255, 255, 0.96);
    --uttms-bottom-bar-border: rgba(203, 213, 225, 0.95);
}

/* Light mode high-contrast text and component styling */
[data-bs-theme="light"] body {
    color: #0f172a;
}

[data-bs-theme="light"] h1,
[data-bs-theme="light"] h2,
[data-bs-theme="light"] h3,
[data-bs-theme="light"] h4,
[data-bs-theme="light"] h5,
[data-bs-theme="light"] h6 {
    color: #0f172a;
    font-weight: 700;
}

[data-bs-theme="light"] p {
    color: #1e293b;
}

[data-bs-theme="light"] .text-muted {
    color: #475569 !important;
}

[data-bs-theme="light"] .text-secondary {
    color: #334155 !important;
}

[data-bs-theme="light"] .form-label,
[data-bs-theme="light"] label {
    color: #0f172a !important;
    font-weight: 600;
}

[data-bs-theme="light"] .card-header {
    background-color: #f1f5f9 !important;
    color: #0f172a !important;
    font-weight: 600;
}

[data-bs-theme="light"] .table th {
    background-color: #e2e8f0 !important;
    color: #0f172a !important;
    font-weight: 700;
}

[data-bs-theme="light"] .table td {
    color: #0f172a !important;
}

/* Ensure solid buttons and badges retain high-contrast white text */
.btn-primary, .btn-primary *,
.btn-success, .btn-success *,
.btn-danger, .btn-danger *,
.btn-dark, .btn-dark *,
.badge.bg-primary, .badge.bg-primary *,
.badge.bg-success, .badge.bg-success *,
.badge.bg-danger, .badge.bg-danger *,
.badge.bg-dark, .badge.bg-dark * {
    color: #ffffff !important;
}

.badge.bg-warning, .badge.bg-warning * {
    color: #0f172a !important;
}

/* Light mode subtle badges contrast enhancement */
[data-bs-theme="light"] .bg-primary-subtle {
    background-color: #dbeafe !important;
    color: #1e40af !important;
    border: 1px solid #bfdbfe !important;
}
[data-bs-theme="light"] .bg-success-subtle {
    background-color: #dcfce7 !important;
    color: #166534 !important;
    border: 1px solid #bbf7d0 !important;
}
[data-bs-theme="light"] .bg-warning-subtle {
    background-color: #fef3c7 !important;
    color: #92400e !important;
    border: 1px solid #fde68a !important;
}
[data-bs-theme="light"] .bg-danger-subtle {
    background-color: #fee2e2 !important;
    color: #991b1b !important;
    border: 1px solid #fecaca !important;
}
[data-bs-theme="light"] .bg-info-subtle {
    background-color: #e0f2fe !important;
    color: #0369a1 !important;
    border: 1px solid #bae6fd !important;
}
[data-bs-theme="light"] .bg-secondary-subtle {
    background-color: #f1f5f9 !important;
    color: #334155 !important;
    border: 1px solid #cbd5e1 !important;
}

[data-bs-theme="dark"] {
    --primary-color: #3b82f6;
    --primary-hover: #60a5fa;
    --secondary-color: #0b1120;
    --bg-light: #0b1120;
    --card-border: #334155;
    
    /* UTTMS Dark Theme Tokens */
    --uttms-bg-body: #0b1120;
    --uttms-bg-surface: #0f172a;
    --uttms-bg-surface-elevated: #1e293b;
    --uttms-bg-card: #0f172a;
    --uttms-border-color: #334155;
    --uttms-border-subtle: #1e293b;
    --uttms-text-primary: #f8fafc;
    --uttms-text-secondary: #cbd5e1;
    --uttms-text-muted: #94a3b8;
    --uttms-navbar-bg: #070d18;
    --uttms-navbar-text: #f8fafc;
    --uttms-sidebar-bg: #0f172a;
    --uttms-sidebar-border: #1e293b;
    --uttms-input-bg: #1e293b;
    --uttms-input-border: #475569;
    --uttms-table-head-bg: #1e293b;
    --uttms-table-border: #334155;
    --uttms-table-stripe: rgba(30, 41, 59, 0.5);
    --uttms-table-hover: rgba(59, 130, 246, 0.12);
    --uttms-slot-bg: #131c2e;
    --uttms-slot-border: #334155;
    --uttms-shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.4);
    --uttms-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -2px rgba(0, 0, 0, 0.4);
    --uttms-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.6), 0 4px 6px -4px rgba(0, 0, 0, 0.5);
    --uttms-shadow-glow: 0 0 20px rgba(59, 130, 246, 0.25);
    --uttms-dive-bg: #0f172a;
    --uttms-dive-header-bg: #1e293b;
    --uttms-bottom-bar-bg: rgba(15, 23, 42, 0.94);
    --uttms-bottom-bar-border: rgba(51, 65, 85, 0.85);
}

body {
    background-color: var(--uttms-bg-body);
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    color: var(--uttms-text-primary);
    transition: background-color 0.25s ease, color 0.25s ease;
    min-height: 100vh;
}

.navbar-brand {
    font-weight: 700;
    letter-spacing: -0.5px;
}

.sidebar {
    background-color: var(--uttms-sidebar-bg) !important;
    border-right: 1px solid var(--uttms-sidebar-border) !important;
    transition: background-color 0.25s ease, border-color 0.25s ease;
}

@media (min-width: 768px) {
    .sidebar {
        position: sticky;
        top: 56px;
        height: calc(100vh - 56px);
        overflow-y: auto;
    }
}

@media (max-width: 767.98px) {
    .sidebar.offcanvas-md {
        width: 300px;
        max-width: 88vw;
        box-shadow: 0 0.5rem 1.5rem rgba(0, 0, 0, 0.25);
    }
}

.card {
    background-color: var(--uttms-bg-card);
    border: 1px solid var(--uttms-border-color);
    border-radius: 0.85rem;
    box-shadow: var(--uttms-shadow-sm);
    transition: background-color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.card-header {
    background-color: var(--uttms-bg-surface-elevated);
    border-bottom: 1px solid var(--uttms-border-color);
    color: var(--uttms-text-primary);
    font-weight: 600;
}

.table {
    color: var(--uttms-text-primary);
    border-color: var(--uttms-table-border);
}

.table th {
    background-color: var(--uttms-table-head-bg);
    color: var(--uttms-text-secondary);
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.025em;
    border-color: var(--uttms-table-border);
}

.table td {
    border-color: var(--uttms-table-border);
}

.table-hover tbody tr:hover {
    background-color: var(--uttms-table-hover);
    color: var(--uttms-text-primary);
}

.form-control, .form-select {
    background-color: var(--uttms-input-bg);
    border-color: var(--uttms-input-border);
    color: var(--uttms-text-primary);
    border-radius: 0.5rem;
}

.form-control:focus, .form-select:focus {
    background-color: var(--uttms-input-bg);
    border-color: #3b82f6;
    color: var(--uttms-text-primary);
    box-shadow: 0 0 0 0.25rem rgba(59, 130, 246, 0.25);
}

.modal-content {
    background-color: var(--uttms-bg-surface);
    color: var(--uttms-text-primary);
    border: 1px solid var(--uttms-border-color);
    border-radius: 1rem;
    box-shadow: var(--uttms-shadow-lg);
}

.modal-header, .modal-footer {
    border-color: var(--uttms-border-color);
}

.dropdown-menu {
    background-color: var(--uttms-bg-surface);
    border: 1px solid var(--uttms-border-color);
    box-shadow: var(--uttms-shadow-lg);
    border-radius: 0.75rem;
}

.dropdown-item {
    color: var(--uttms-text-primary);
    font-weight: 500;
    transition: all 0.15s ease;
}

.dropdown-item:hover {
    background-color: var(--uttms-bg-surface-elevated);
    color: #3b82f6;
}

.dropdown-divider {
    border-color: var(--uttms-border-color);
}

/* Timetable Matrix Grid */
.timetable-grid-table {
    border-collapse: separate;
    border-spacing: 0;
    width: 100%;
}

.timetable-grid-table th, .timetable-grid-table td {
    border: 1px solid var(--uttms-table-border);
    vertical-align: middle;
    text-align: center;
    padding: 0.5rem;
}

.timetable-slot {
    min-height: 90px;
    height: 100%;
    border-radius: 0.5rem;
    padding: 0.5rem;
    transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.25s ease;
    cursor: grab;
    position: relative;
    background: var(--uttms-slot-bg);
    border: 1px solid var(--uttms-slot-border);
    color: var(--uttms-text-primary);
}

.timetable-slot:hover {
    transform: translateY(-2px);
    box-shadow: var(--uttms-shadow-md);
    border-color: #3b82f6;
}

.timetable-slot.locked {
    border-left: 4px solid #f59e0b;
}

.timetable-slot.break-slot {
    background-color: var(--uttms-bg-surface-elevated);
    color: var(--uttms-text-muted);
    font-style: italic;
    cursor: not-allowed;
}

.badge-role {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.35rem 0.65rem;
    border-radius: 9999px;
}

/* RTL support */
[dir="rtl"] {
    text-align: right;
    font-family: 'Nafees Nastaleeq', 'Jameel Noori Nastaleeq', 'Traditional Arabic', 'Segoe UI', Tahoma, sans-serif;
}
[dir="rtl"] .sidebar {
    border-right: none !important;
    border-left: 1px solid var(--uttms-sidebar-border) !important;
}

@media print {
    .no-print, .sidebar, .navbar, .btn, form {
        display: none !important;
    }
    .main-content {
        margin: 0 !important;
        padding: 0 !important;
        width: 100% !important;
    }
    .card {
        border: none !important;
        box-shadow: none !important;
    }
}

/* Tab User Guide & Help Triggers */
.tab-help-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background-color: rgba(226, 232, 240, 0.7);
    color: #64748b;
    font-size: 0.78rem;
    transition: all 0.2s ease;
    cursor: pointer;
    flex-shrink: 0;
}

.sidebar .nav-link:hover .tab-help-icon,
.tab-help-icon:hover {
    background-color: #2563eb !important;
    color: #ffffff !important;
    transform: scale(1.15);
}

.sidebar .nav-link.active .tab-help-icon {
    background-color: #1d4ed8;
    color: #ffffff;
}

/* Rules Hero Card & Login Showcase Styling */
.rules-hero-card {
    border-radius: 1rem;
    transition: all 0.25s ease;
}

[data-bs-theme="light"] .rules-hero-card {
    background: #ffffff;
    border: 1px solid #cbd5e1;
    color: #0f172a;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

[data-bs-theme="light"] .rules-hero-card .hero-title,
[data-bs-theme="light"] .rules-hero-card .hero-heading,
[data-bs-theme="light"] .rules-hero-card .hero-item-title,
[data-bs-theme="light"] .rules-hero-card .hero-item-strong {
    color: #0f172a !important;
}

[data-bs-theme="light"] .rules-hero-card .hero-subtitle,
[data-bs-theme="light"] .rules-hero-card .hero-item-desc {
    color: #334155 !important;
}

[data-bs-theme="light"] .rules-hero-card .hero-btn {
    border-color: #cbd5e1 !important;
    color: #334155 !important;
    background-color: #f8fafc !important;
}

[data-bs-theme="light"] .rules-hero-card .hero-btn:hover {
    background-color: #e2e8f0 !important;
    color: #0f172a !important;
}

[data-bs-theme="light"] .rules-hero-card .uttms-dive-box {
    background: #ffffff !important;
    border: 1px solid #cbd5e1 !important;
}

[data-bs-theme="light"] .rules-hero-card .uttms-dive-trigger {
    background: #f8fafc !important;
    color: #0f172a !important;
}

[data-bs-theme="light"] .rules-hero-card .uttms-dive-content {
    background: #ffffff !important;
    color: #1e293b !important;
}

[data-bs-theme="dark"] .rules-hero-card {
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    border: 1px solid #334155;
    color: #f8fafc;
}

[data-bs-theme="dark"] .rules-hero-card .hero-title,
[data-bs-theme="dark"] .rules-hero-card .hero-heading,
[data-bs-theme="dark"] .rules-hero-card .hero-item-title,
[data-bs-theme="dark"] .rules-hero-card .hero-item-strong {
    color: #f8fafc !important;
}

[data-bs-theme="dark"] .rules-hero-card .hero-subtitle {
    color: #94a3b8 !important;
}

[data-bs-theme="dark"] .rules-hero-card .hero-item-desc {
    color: #cbd5e1 !important;
}

[data-bs-theme="dark"] .rules-hero-card .hero-btn {
    border-color: rgba(255, 255, 255, 0.25) !important;
    color: #cbd5e1 !important;
    background-color: transparent !important;
}

[data-bs-theme="dark"] .rules-hero-card .hero-btn:hover {
    background-color: rgba(255, 255, 255, 0.15) !important;
    color: #ffffff !important;
}

[data-bs-theme="dark"] .rules-hero-card .uttms-dive-box {
    background: rgba(255, 255, 255, 0.05) !important;
    border: 1px solid rgba(255, 255, 255, 0.12) !important;
}

[data-bs-theme="dark"] .rules-hero-card .uttms-dive-trigger {
    background: rgba(255, 255, 255, 0.08) !important;
    color: #f8fafc !important;
}

[data-bs-theme="dark"] .rules-hero-card .uttms-dive-content {
    background: rgba(15, 23, 42, 0.5) !important;
    color: #cbd5e1 !important;
}

.rule-item-box {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 0.75rem;
    padding: 0.85rem 1rem;
    transition: all 0.2s ease;
}

.rule-item-box:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
    border-color: rgba(59, 130, 246, 0.5);
}

.rule-badge-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.85rem;
    flex-shrink: 0;
}

/* Responsive Viewport & Mobile Optimizations */
@media (max-width: 767.98px) {
    .main-content {
        padding-left: 0.75rem !important;
        padding-right: 0.75rem !important;
        padding-top: 1rem !important;
        max-width: 100vw;
        overflow-x: hidden;
    }
    
    .navbar-brand span {
        font-size: 0.95rem;
    }
    
    .table-responsive {
        border-radius: 0.5rem;
        -webkit-overflow-scrolling: touch;
    }
    
    .card {
        margin-bottom: 1rem;
    }

    /* Make buttons and badges touch-friendly */
    .btn-sm {
        padding: 0.35rem 0.65rem;
    }
}

/* Touch-friendly horizontal scrolling for wide grids */
.table-responsive {
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
}

/* =========================================================================
   UTTMS MODERN TACTILE TAB & BUTTON DESIGN SYSTEM
   ========================================================================= */
.uttms-tabs-container {
    background: #0f172a;
    border-radius: 1rem;
    padding: 1rem;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.2), 0 8px 10px -6px rgba(0, 0, 0, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.uttms-tabs-container.light-theme {
    background: #ffffff;
    border: 1px solid #e2e8f0;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
}

.uttms-tab-btn {
    border-radius: 14px;
    padding: 14px 18px;
    text-align: left;
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    border: 2px solid rgba(255, 255, 255, 0.12);
    background: rgba(255, 255, 255, 0.06);
    color: #cbd5e1;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 14px;
    width: 100%;
    cursor: pointer;
}

.uttms-tabs-container.light-theme .uttms-tab-btn {
    background: #f8fafc;
    border-color: #e2e8f0;
    color: #475569;
}

.uttms-tab-btn:hover {
    background: rgba(255, 255, 255, 0.14);
    color: #ffffff;
    transform: translateY(-2px);
    border-color: rgba(255, 255, 255, 0.3);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.25);
}

.uttms-tabs-container.light-theme .uttms-tab-btn:hover {
    background: #f1f5f9;
    color: #0f172a;
    border-color: #cbd5e1;
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.06);
}

/* Gradient Variants */
/* Sapphire / Royal Blue (Default Primary) */
.uttms-tab-btn.active.sapphire-theme,
.uttms-tab-btn.active.admin-btn,
.uttms-tab-btn.active.primary-theme {
    background: linear-gradient(135deg, #1d4ed8 0%, #2563eb 60%, #3b82f6 100%) !important;
    border-color: #93c5fd !important;
    color: #ffffff !important;
    box-shadow: 0 12px 28px rgba(37, 99, 235, 0.45) !important;
    transform: translateY(-1px);
}

/* Tangerine / Amber */
.uttms-tab-btn.active.amber-theme,
.uttms-tab-btn.active.faculty-btn,
.uttms-tab-btn.active.warning-theme {
    background: linear-gradient(135deg, #d97706 0%, #ea580c 60%, #f97316 100%) !important;
    border-color: #fde047 !important;
    color: #ffffff !important;
    box-shadow: 0 12px 28px rgba(234, 88, 12, 0.45) !important;
    transform: translateY(-1px);
}

/* Emerald / Teal */
.uttms-tab-btn.active.emerald-theme,
.uttms-tab-btn.active.success-theme {
    background: linear-gradient(135deg, #047857 0%, #059669 60%, #10b981 100%) !important;
    border-color: #6ee7b7 !important;
    color: #ffffff !important;
    box-shadow: 0 12px 28px rgba(5, 150, 105, 0.45) !important;
    transform: translateY(-1px);
}

/* Indigo / Violet */
.uttms-tab-btn.active.indigo-theme,
.uttms-tab-btn.active.purple-theme {
    background: linear-gradient(135deg, #4338ca 0%, #4f46e5 60%, #7c3aed 100%) !important;
    border-color: #c4b5fd !important;
    color: #ffffff !important;
    box-shadow: 0 12px 28px rgba(79, 70, 229, 0.45) !important;
    transform: translateY(-1px);
}

/* Icon Box */
.uttms-icon-box {
    width: 46px;
    height: 46px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    flex-shrink: 0;
    background: rgba(255, 255, 255, 0.12);
    color: #ffffff;
    transition: all 0.25s ease;
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.uttms-tabs-container.light-theme .uttms-icon-box {
    background: #e2e8f0;
    color: #1e293b;
    border-color: #cbd5e1;
}

.uttms-tab-btn.active .uttms-icon-box {
    background: rgba(255, 255, 255, 0.25) !important;
    color: #ffffff !important;
    transform: scale(1.06);
    border-color: rgba(255, 255, 255, 0.4) !important;
}

/* Selected Pill Badge */
.uttms-active-pill {
    font-size: 0.7rem;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    font-weight: 700;
    padding: 3px 9px;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.25);
    color: #ffffff;
    backdrop-filter: blur(4px);
    display: none;
}

.uttms-tab-btn.active .uttms-active-pill {
    display: inline-flex !important;
}

.uttms-sublabel {
    font-size: 0.74rem;
    font-weight: 600;
    border-radius: 6px;
    padding: 2px 8px;
}

/* Global upgrade for standard nav-tabs and nav-pills */
.nav-pills .nav-link {
    border-radius: 10px;
    font-weight: 600;
    transition: all 0.2s ease;
    padding: 8px 16px;
}

.nav-pills .nav-link.active {
    background: linear-gradient(135deg, #1d4ed8 0%, #2563eb 100%);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.35);
}

.nav-tabs .nav-link {
    border-radius: 8px 8px 0 0;
    font-weight: 600;
    color: #64748b;
    transition: all 0.2s ease;
}

.nav-tabs .nav-link.active {
    color: #1d4ed8;
    font-weight: 700;
    border-bottom: 3px solid #2563eb;
}

/* ==========================================================================
   TACTILE SIDEBAR NAVIGATION SYSTEM
   ========================================================================== */
.sidebar {
    background: #ffffff;
    border-right: 1px solid #e2e8f0;
}

.sidebar .nav-pills {
    gap: 4px;
}

.sidebar-nav-item {
    margin: 2px 6px;
}

.sidebar-section-header {
    padding: 12px 14px 6px 14px;
    font-size: 0.72rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: #94a3b8;
    display: flex;
    align-items: center;
    gap: 6px;
}

.sidebar-section-header i {
    font-size: 0.85rem;
}

.sidebar .nav-link {
    color: #334155;
    font-weight: 600;
    font-size: 0.88rem;
    padding: 8px 12px;
    border-radius: 12px;
    margin: 2px 8px;
    display: flex;
    align-items: center;
    gap: 10px;
    border: 1px solid transparent;
    background: transparent;
    transition: all 0.22s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.sidebar-icon-box {
    width: 32px;
    height: 32px;
    border-radius: 9px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    flex-shrink: 0;
    background: #f1f5f9;
    color: #475569;
    border: 1px solid #e2e8f0;
    transition: all 0.22s ease;
}

.sidebar .nav-link:hover {
    color: #1e40af;
    background-color: #f8fafc;
    border-color: #cbd5e1;
    transform: translateX(4px);
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.04);
}

.sidebar .nav-link:hover .sidebar-icon-box {
    background-color: #e0e7ff;
    color: #2563eb;
    border-color: #c7d2fe;
    transform: scale(1.08);
}

/* Default / Sapphire Active State (Dashboard & Timetables) */
.sidebar .nav-link.active,
.sidebar .nav-link.active.sapphire-nav {
    background: linear-gradient(135deg, #1d4ed8 0%, #2563eb 60%, #3b82f6 100%) !important;
    color: #ffffff !important;
    font-weight: 700 !important;
    border-color: #93c5fd !important;
    box-shadow: 0 6px 16px rgba(37, 99, 235, 0.35) !important;
    transform: translateX(3px);
}

.sidebar .nav-link.active .sidebar-icon-box {
    background: rgba(255, 255, 255, 0.22) !important;
    color: #ffffff !important;
    border-color: rgba(255, 255, 255, 0.4) !important;
    transform: scale(1.06);
}

/* Emerald Active State (Academic Structure) */
.sidebar .nav-link.active.emerald-nav {
    background: linear-gradient(135deg, #047857 0%, #059669 60%, #10b981 100%) !important;
    border-color: #a7f3d0 !important;
    box-shadow: 0 6px 16px rgba(16, 185, 129, 0.35) !important;
}

/* Indigo Active State (Faculty & Resources) */
.sidebar .nav-link.active.indigo-nav {
    background: linear-gradient(135deg, #4338ca 0%, #4f46e5 60%, #6366f1 100%) !important;
    border-color: #c7d2fe !important;
    box-shadow: 0 6px 16px rgba(79, 70, 229, 0.35) !important;
}

/* Amber Active State (System Administration) */
.sidebar .nav-link.active.amber-nav {
    background: linear-gradient(135deg, #b45309 0%, #d97706 60%, #f59e0b 100%) !important;
    border-color: #fde68a !important;
    box-shadow: 0 6px 16px rgba(217, 119, 6, 0.35) !important;
}

/* Violet Active State (SOLVER & Generators) */
.sidebar .nav-link.active.violet-nav {
    background: linear-gradient(135deg, #6d28d9 0%, #7c3aed 60%, #8b5cf6 100%) !important;
    border-color: #ddd6fe !important;
    box-shadow: 0 6px 16px rgba(124, 58, 237, 0.35) !important;
}

/* ==========================================================================
   GOOGLE ADSENSE PLACEMENT SYSTEM
   ========================================================================== */
.uttms-ad-container {
    background: #ffffff;
    border: 1px dashed #cbd5e1;
    border-radius: 14px;
    padding: 10px 14px;
    text-align: center;
    position: relative;
    overflow: hidden;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.03);
    transition: all 0.25s ease;
}

.uttms-ad-container:hover {
    border-color: #94a3b8;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}

.uttms-ad-label {
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: #94a3b8;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    margin-bottom: 6px;
}

.uttms-ad-placeholder {
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    border: 1px solid #e2e8f0;
    border-radius: 10px;
    padding: 14px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
}

.uttms-ad-placeholder .google-badge {
    font-size: 0.72rem;
    font-weight: 700;
    background: #ffffff;
    border: 1px solid #cbd5e1;
    padding: 3px 8px;
    border-radius: 20px;
    color: #475569;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.uttms-ad-header {
    margin: 0 0 16px 0;
}

.uttms-ad-sidebar {
    margin: 14px 8px;
    padding: 10px;
}

.uttms-ad-footer {
    margin: 24px 0 12px 0;
}

@media print {
    .uttms-ad-container,
    .adsbygoogle,
    .adsense-placement {
        display: none !important;
    }
}

/* ==========================================================================
   APPHARBOR LICENSING, DEMO EVALUATION & WATERMARKING
   ========================================================================== */
.uttms-demo-banner {
    background: #fef3c7;
    border-bottom: 1px solid #fde68a;
    color: #92400e;
    font-size: 0.85rem;
    position: relative;
    z-index: 1035;
    font-weight: 500;
}

[data-bs-theme="dark"] .uttms-demo-banner {
    background: #78350f;
    border-bottom: 1px solid #92400e;
    color: #fef3c7;
}

.uttms-warning-banner {
    font-size: 0.85rem;
    position: relative;
    z-index: 1035;
    font-weight: 500;
}

.uttms-print-watermark {
    text-align: center;
    font-size: 9.5pt;
    color: #475569;
    border-bottom: 1.5px dashed #94a3b8;
    padding-bottom: 6px;
    margin-bottom: 14px;
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    font-weight: 700;
}

@media screen {
    .uttms-print-watermark {
        display: none !important;
    }
}

@media print {
    .uttms-print-watermark {
        display: block !important;
    }
}

/* ==========================================================================
   INTERACTIVE INFORMATION ACCORDION COMPONENT (ARROW-ONLY CONTROLS)
   ========================================================================== */
.uttms-accordion-box,
.uttms-dive-box {
    background: var(--uttms-dive-bg);
    border: 1px solid var(--uttms-border-color);
    border-radius: 14px;
    margin-bottom: 1rem;
    overflow: hidden;
    transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: var(--uttms-shadow-sm);
}

.uttms-accordion-box:hover,
.uttms-dive-box:hover {
    border-color: #3b82f6;
    box-shadow: var(--uttms-shadow-md);
}

.uttms-accordion-box[open],
.uttms-dive-box[open] {
    box-shadow: var(--uttms-shadow-md);
    border-color: #3b82f6;
}

.uttms-accordion-trigger,
.uttms-dive-trigger {
    padding: 12px 18px;
    background: var(--uttms-dive-header-bg);
    cursor: pointer;
    user-select: none;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    font-weight: 600;
    color: var(--uttms-text-primary);
    transition: all 0.2s ease;
}

.uttms-accordion-trigger::-webkit-details-marker,
.uttms-dive-trigger::-webkit-details-marker {
    display: none;
}

.uttms-accordion-trigger:hover,
.uttms-dive-trigger:hover {
    background: var(--uttms-bg-surface-elevated);
}

.uttms-dive-icon {
    width: 32px;
    height: 32px;
    border-radius: 9px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    background: rgba(37, 99, 235, 0.12);
    color: #2563eb;
    flex-shrink: 0;
}

[data-bs-theme="dark"] .uttms-dive-icon {
    background: rgba(59, 130, 246, 0.2);
    color: #60a5fa;
}

/* Arrow-Only Button (Clean, Circular, Interactive) */
.accordion-arrow-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: rgba(37, 99, 235, 0.1);
    color: #2563eb;
    border: 1px solid rgba(37, 99, 235, 0.25);
    transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
    flex-shrink: 0;
}

[data-bs-theme="dark"] .accordion-arrow-btn {
    background: rgba(59, 130, 246, 0.18);
    color: #93c5fd;
    border-color: rgba(59, 130, 246, 0.35);
}

details[open] .accordion-arrow-btn {
    background: #2563eb;
    color: #ffffff;
    border-color: #2563eb;
}

[data-bs-theme="dark"] details[open] .accordion-arrow-btn {
    background: #3b82f6;
    color: #ffffff;
    border-color: #3b82f6;
}

/* Arrow Rotation on Open */
.accordion-arrow,
.dive-arrow {
    transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1);
    font-size: 0.85rem;
    display: inline-block;
}

details[open] .accordion-arrow,
details[open] .dive-arrow {
    transform: rotate(180deg);
}

.uttms-accordion-content,
.uttms-dive-content {
    padding: 16px 20px;
    border-top: 1px solid var(--uttms-border-color);
    background: var(--uttms-dive-bg);
    color: var(--uttms-text-secondary);
    font-size: 0.92rem;
    line-height: 1.6;
    animation: fadeInAccordion 0.25s ease;
}

@keyframes fadeInAccordion {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDive {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ==========================================================================
   MOBILE & TABLET BOTTOM FLOATING DOCK NAVIGATION
   ========================================================================== */
.uttms-bottom-nav {
    display: none;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 1040;
    background: var(--uttms-bottom-bar-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-top: 1px solid var(--uttms-bottom-bar-border);
    padding: 6px 8px calc(6px + env(safe-area-inset-bottom, 0px));
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.08);
}

@media (max-width: 991.98px) {
    .uttms-bottom-nav {
        display: flex;
        align-items: center;
        justify-content: space-around;
    }
    
    body {
        padding-bottom: 74px !important;
    }
}

.uttms-bottom-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 3px;
    color: var(--uttms-text-secondary);
    text-decoration: none;
    font-size: 0.72rem;
    font-weight: 600;
    padding: 6px 8px;
    border-radius: 12px;
    transition: all 0.2s ease;
    min-width: 54px;
    cursor: pointer;
    border: none;
    background: transparent;
}

.uttms-bottom-item i {
    font-size: 1.25rem;
    line-height: 1;
}

.uttms-bottom-item:hover,
.uttms-bottom-item.active {
    color: #2563eb;
    background: rgba(37, 99, 235, 0.1);
}

[data-bs-theme="dark"] .uttms-bottom-item:hover,
[data-bs-theme="dark"] .uttms-bottom-item.active {
    color: #60a5fa;
    background: rgba(59, 130, 246, 0.18);
}

/* Responsive Timetable Touch Optimizations */
.table-responsive-tactile {
    position: relative;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: 12px;
    border: 1px solid var(--uttms-table-border);
}

.table-swipe-hint {
    font-size: 0.75rem;
    color: var(--uttms-text-muted);
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 8px;
    border-radius: 6px;
    background: var(--uttms-bg-surface-elevated);
}

/* Custom Scrollbars in Bright & Dark Mode */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--uttms-bg-body);
}

::-webkit-scrollbar-thumb {
    background: var(--uttms-border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--uttms-text-muted);
}