/**
 * Optimized CSS - Consolidated and Mobile-First
 * Performance, accessibility, and UX improvements for multi-entity educational system
 */

/* ============================================
   CSS VARIABLES & THEME SYSTEM
   ============================================ */
:root {
    /* Primary Colors */
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #dbeafe;
    --primary-dark: #1e40af;
    
    /* Secondary Colors */
    --secondary-color: #64748b;
    --secondary-hover: #475569;
    --secondary-light: #f1f5f9;
    
    /* Status Colors */
    --success-color: #10b981;
    --success-light: #d1fae5;
    --warning-color: #f59e0b;
    --warning-light: #fef3c7;
    --danger-color: #ef4444;
    --danger-light: #fee2e2;
    --info-color: #06b6d4;
    --info-light: #cffafe;
    
    /* Neutral Colors */
    --white: #ffffff;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Transitions */
    --transition-fast: all 0.15s ease-in-out;
    --transition: all 0.2s ease-in-out;
    --transition-slow: all 0.3s ease-in-out;
    
    /* Z-Index Scale */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    padding: 0;
    background-color: var(--gray-50);
    color: var(--gray-900);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    margin: 0 0 var(--spacing-md) 0;
    font-weight: 600;
    line-height: 1.25;
    color: var(--gray-900);
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }
h5 { font-size: var(--font-size-base); }
h6 { font-size: var(--font-size-sm); }

p {
    margin: 0 0 var(--spacing-md) 0;
    color: var(--gray-700);
}

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

a:hover {
    color: var(--primary-hover);
    text-decoration: underline;
}

/* ============================================
   LAYOUT SYSTEM
   ============================================ */
/*
  NOTE: Bootstrap is loaded globally and already defines `.container`, `.row`, `.col`, and `.col-*`.
  Overriding those core grid classes here can break gutters/breakpoints and cause responsive regressions.
  If you need a custom grid, prefer EDU-prefixed classes (e.g. `.edu-container`, `.edu-row`, `.edu-col-*`).
*/

/* ============================================
   NAVIGATION
   ============================================ */
.navbar {
    background: var(--primary-color);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    padding: var(--spacing-md) 0;
}

.navbar-brand {
    color: var(--white);
    font-weight: 700;
    font-size: var(--font-size-lg);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.navbar-nav {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: var(--spacing-xs);
}

.nav-link {
    color: rgba(255, 255, 255, 0.9);
    padding: var(--spacing-sm) var(--spacing-md);
    text-decoration: none;
    transition: var(--transition-fast);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    min-height: 44px; /* Touch target */
}

.nav-link:hover {
    color: var(--white);
    background-color: rgba(255, 255, 255, 0.1);
}

.nav-link.active {
    background-color: rgba(255, 255, 255, 0.2);
    color: var(--white);
}

/* ============================================
   CARDS
   ============================================ */
.card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    margin-bottom: var(--spacing-md);
    overflow: hidden;
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.card-header {
    background: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
    padding: var(--spacing-md);
    font-weight: 600;
    color: var(--gray-900);
}

.card-body {
    padding: var(--spacing-md);
}

.card-footer {
    background: var(--gray-50);
    border-top: 1px solid var(--gray-200);
    padding: var(--spacing-md);
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    line-height: 1.5;
    text-align: center;
    text-decoration: none;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    min-height: 44px; /* Touch target */
    min-width: 44px;
    position: relative;
    overflow: hidden;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-compact {
    padding: 0.3rem 0.65rem;
    font-size: 0.8125rem;
    min-height: 32px;
    min-width: 32px;
    border-radius: var(--radius-sm);
}

.btn-icon {
    padding: 0.35rem;
    width: 2.25rem;
    height: 2.25rem;
    border-radius: 999px;
    font-size: 0.85rem;
    gap: 0;
}

.btn-icon i {
    margin: 0;
    line-height: 1;
}

.btn-icon.btn-compact {
    width: 2rem;
    height: 2rem;
    font-size: 0.75rem;
}

.btn-outline-light.btn-icon {
    border-color: rgba(255, 255, 255, 0.65);
    color: #ffffff;
    background-color: rgba(255, 255, 255, 0.12);
}

.btn-outline-light.btn-icon:hover {
    border-color: #ffffff;
    background-color: rgba(255, 255, 255, 0.25);
    color: #ffffff;
}

.color-picker-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.color-picker-group .form-check {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: 0;
}

.color-picker-group .form-check-label {
    font-size: 0.75rem;
    color: var(--gray-600);
}

.color-picker-input {
    width: 2.75rem;
    height: 2.75rem;
    padding: 0;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-sm);
    background: transparent;
}

.color-picker-input:focus {
    outline: 3px solid rgba(37, 99, 235, 0.35);
    outline-offset: 2px;
}

.color-picker-input:disabled {
    opacity: 0.65;
    cursor: not-allowed;
}

.color-picker-input.is-transparent {
    background-image: repeating-linear-gradient(45deg, rgba(0, 0, 0, 0.18) 0, rgba(0, 0, 0, 0.18) 6px, rgba(255, 255, 255, 0.55) 6px, rgba(255, 255, 255, 0.55) 12px);
    background-size: 12px 12px;
}

.color-picker-input.is-transparent::-webkit-color-swatch-wrapper {
    background: transparent;
}

.color-picker-input.is-transparent::-webkit-color-swatch {
    border: none;
    background: transparent;
}

.color-picker-input:disabled::-webkit-color-swatch-wrapper {
    background: repeating-linear-gradient(45deg, rgba(0, 0, 0, 0.18) 0, rgba(0, 0, 0, 0.18) 6px, rgba(255, 255, 255, 0.55) 6px, rgba(255, 255, 255, 0.55) 12px);
    border-radius: var(--radius-sm);
}

.color-picker-input:disabled::-webkit-color-swatch {
    border: none;
    background: transparent;
}

.tier-color-dot {
    display: inline-block;
    width: 0.85rem;
    height: 0.85rem;
    border-radius: 50%;
    border: 1px solid rgba(0, 0, 0, 0.35);
    margin-right: var(--spacing-xs);
    box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.65);
}

.tier-color-dot.transparent {
    background-image: repeating-linear-gradient(45deg, rgba(0, 0, 0, 0.18) 0, rgba(0, 0, 0, 0.18) 6px, rgba(255, 255, 255, 0.85) 6px, rgba(255, 255, 255, 0.85) 12px);
    background-size: 12px 12px;
    background-color: transparent;
}

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
    color: var(--white);
}

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

.btn-secondary:hover:not(:disabled) {
    background-color: var(--secondary-hover);
    border-color: var(--secondary-hover);
    color: var(--white);
}

.btn-outline-primary {
    background-color: transparent;
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.btn-outline-primary:hover:not(:disabled) {
    background-color: var(--primary-color);
    color: var(--white);
}

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

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

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

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-xs);
    min-height: 38px;
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: var(--font-size-lg);
    min-height: 52px;
}

/* ============================================
   FORMS
   ============================================ */
.form-control {
    display: block;
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--font-size-base);
    line-height: 1.5;
    color: var(--gray-900);
    background-color: var(--white);
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
    min-height: 44px; /* Touch target */
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Keep checkboxes and radios square app-wide (prevent stretch in flex layouts) */
.form-check-input[type="checkbox"],
.form-check-input[type="radio"],
input.form-check-input[type="checkbox"],
input.form-check-input[type="radio"],
.form-check input[type="checkbox"],
.form-check input[type="radio"],
.form-check-lg .form-check-input[type="checkbox"],
.form-check-lg .form-check-input[type="radio"] {
    width: 1.125em !important;
    height: 1.125em !important;
    min-width: 1.125em !important;
    min-height: 1.125em !important;
    max-width: 1.125em !important;
    max-height: 1.125em !important;
    flex-shrink: 0 !important;
    flex-grow: 0 !important;
    aspect-ratio: 1 / 1 !important;
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
    color: var(--gray-700);
}

.form-select {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='m6 8 4 4 4-4'/%3e%3c/svg%3e");
    background-position: right var(--spacing-sm) center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
    padding-right: 2.5rem;
}

/* ============================================
   TABS
   ============================================ */

/* Bootstrap Tab Overrides */
.nav-tabs {
    border-bottom: 1px solid var(--gray-300);
    margin-bottom: var(--spacing-md);
}

.nav-tabs .nav-link {
    color: var(--gray-600) !important;
    background-color: transparent;
    border: 1px solid transparent;
    border-top-left-radius: var(--border-radius);
    border-top-right-radius: var(--border-radius);
    padding: var(--spacing-sm) var(--spacing-md);
    margin-bottom: -1px;
    transition: all 0.15s ease-in-out;
}

.nav-tabs .nav-link:hover {
    color: var(--gray-800) !important;
    background-color: var(--gray-100);
    border-color: var(--gray-300) var(--gray-300) transparent;
}

.nav-tabs .nav-link.active {
    color: var(--gray-800) !important;
    background-color: var(--white);
    border-color: var(--gray-300) var(--gray-300) var(--white);
    font-weight: 600;
}

.nav-tabs .nav-link:focus {
    color: var(--gray-800) !important;
    background-color: var(--gray-100);
    border-color: var(--gray-300) var(--gray-300) transparent;
    outline: 0;
    box-shadow: 0 0 0 0.2rem rgba(37, 99, 235, 0.25);
}

/* Tab Content */
.tab-content {
    background-color: var(--white);
    border: 1px solid var(--gray-300);
    border-top: none;
    border-radius: 0 0 var(--border-radius) var(--border-radius);
    padding: var(--spacing-lg);
}

/*
 * Only the active pane may use layout. Bootstrap leaves `show` on fading panes after `active`
 * is removed; pairing `.show` with display:block stacks huge invisible panes above later tabs
 * in the DOM and blocks clicks (e.g. Entity Settings → Policies “View / Edit”).
 * !important beats stray utilities / theme rules that were leaving panes in flow (huge gap above the active tab).
 */
.tab-content > .tab-pane {
    display: none !important;
}

.tab-content > .tab-pane.active {
    display: block !important;
}

/* Tab Badge Styling */
.nav-tabs .nav-link .badge {
    font-size: 0.75em;
    margin-left: var(--spacing-xs);
}

/* Tab Icon Styling */
.nav-tabs .nav-link i {
    margin-right: var(--spacing-xs);
    width: 1em;
    text-align: center;
}

/* Disabled Tab Styling */
.nav-tabs .nav-link:disabled {
    color: var(--gray-400) !important;
    background-color: transparent;
    border-color: transparent;
    cursor: not-allowed;
}

/* Tab Loading State */
.nav-tabs .nav-link.loading {
    position: relative;
    color: var(--gray-500) !important;
}

.nav-tabs .nav-link.loading::after {
    content: '';
    position: absolute;
    right: var(--spacing-sm);
    top: 50%;
    transform: translateY(-50%);
    width: 12px;
    height: 12px;
    border: 2px solid var(--gray-300);
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: translateY(-50%) rotate(0deg); }
    100% { transform: translateY(-50%) rotate(360deg); }
}

/* Mobile Tab Responsiveness */
@media (max-width: 768px) {
    .nav-tabs {
        flex-wrap: wrap;
    }
    
    .nav-tabs .nav-link {
        font-size: var(--font-size-sm);
        padding: var(--spacing-xs) var(--spacing-sm);
        margin-bottom: var(--spacing-xs);
    }
    
    .tab-content {
        padding: var(--spacing-md);
    }
    
    /* Stack tabs vertically on very small screens */
    .nav-tabs.flex-column {
        flex-direction: column;
    }
    
    .nav-tabs.flex-column .nav-link {
        border-radius: var(--border-radius) 0 0 var(--border-radius);
        margin-bottom: 0;
        margin-right: -1px;
    }
}

/* ============================================
   TABLES
   ============================================ */
.table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: var(--spacing-md);
}

.table th,
.table td {
    padding: var(--spacing-sm) var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

.table th {
    background-color: var(--gray-50);
    font-weight: 600;
    color: var(--gray-900);
}

.table-striped tbody tr:nth-child(odd) {
    background-color: var(--gray-50);
}

.table-hover tbody tr:hover {
    background-color: var(--gray-100);
}

.table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

/* ============================================
   ALERTS
   ============================================ */
.alert {
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    border-left: 4px solid;
}

.alert-success {
    background-color: var(--success-light);
    border-color: var(--success-color);
    border-left-color: var(--success-color);
    color: #065f46;
}

.alert-danger {
    background-color: var(--danger-light);
    border-color: var(--danger-color);
    border-left-color: var(--danger-color);
    color: #991b1b;
}

.alert-warning {
    background-color: var(--warning-light);
    border-color: var(--warning-color);
    border-left-color: var(--warning-color);
    color: #92400e;
}

.alert-info {
    background-color: var(--info-light);
    border-color: var(--info-color);
    border-left-color: var(--info-color);
    color: #0c4a6e;
}

/* ============================================
   BADGES
   ============================================ */
.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-xs);
    font-weight: 500;
    line-height: 1;
    text-align: center;
    white-space: nowrap;
    border-radius: var(--radius-sm);
    gap: var(--spacing-xs);
}

.badge-primary {
    background-color: var(--primary-color);
    color: var(--white);
}

.badge-success {
    background-color: var(--success-color);
    color: var(--white);
}

.badge-warning {
    background-color: var(--warning-color);
    color: var(--white);
}

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

.badge-secondary {
    background-color: var(--secondary-color);
    color: var(--white);
}

/* ============================================
   MODALS
   ============================================ */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.modal.show {
    opacity: 1;
    visibility: visible;
}

.modal-dialog {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.9);
    transition: var(--transition);
}

.modal.show .modal-dialog {
    transform: scale(1);
}

.modal-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--gray-200);
    display: flex;
    gap: var(--spacing-sm);
    justify-content: flex-end;
}

/*
 * Delete Entity modal: Bootstrap’s .modal-dialog-centered uses min-height ~100vh; optimized.css
 * paints .modal-dialog white — together that draws a full-height white “pillar”. Keep the flex
 * shim from stretching; put the card treatment on .modal-content only.
 */
#entityDeleteModal .modal-dialog.modal-dialog-centered {
    min-height: auto;
    align-items: center;
    background: transparent;
    box-shadow: none;
}

#entityDeleteModal .modal-content {
    width: 100%;
    box-shadow: var(--shadow-xl);
    border-radius: var(--radius-lg);
}

/*
 * Plan limit modal: avoid full-height white pillar when using .modal-dialog-centered.
 * Keep the dialog wrapper transparent and let .modal-content render as the compact card.
 */
#eduPlanLimitExceededModal .modal-dialog.modal-dialog-centered {
    min-height: auto;
    align-items: center;
    background: transparent;
    box-shadow: none;
}

#eduPlanLimitExceededModal .modal-content {
    width: 100%;
    box-shadow: var(--shadow-xl);
    border-radius: var(--radius-lg);
}

/* ============================================
   MOBILE OPTIMIZATIONS
   ============================================ */
@media (max-width: 768px) {
    /*
      NOTE: Do not override Bootstrap grid classes in mobile CSS.
      Use Bootstrap’s responsive grid utilities instead.
    */
    
    .navbar-nav {
        flex-direction: column;
        gap: var(--spacing-xs);
    }

    /* Make mobile nav menus scrollable */
    .navbar-collapse {
        max-height: calc(100vh - 64px);
        overflow-y: auto;
    }

    .navbar .dropdown-menu {
        max-height: 70vh;
        overflow-y: auto;
    }
    
    .nav-link {
        width: 100%;
        justify-content: flex-start;
    }
    
    .card-body {
        padding: var(--spacing-sm);
    }
    
    .btn {
        width: 100%;
        margin-bottom: var(--spacing-xs);
    }
    
    .btn-group .btn {
        width: auto;
        margin-bottom: 0;
    }
    
    .table-responsive {
        font-size: var(--font-size-sm);
    }
    
    .table th,
    .table td {
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    .modal-dialog {
        margin: var(--spacing-sm);
        width: calc(100% - 2rem);
        max-width: none;
    }
    
    .modal-header,
    .modal-body,
    .modal-footer {
        padding: var(--spacing-md);
    }
}

/* ============================================
   ACCESSIBILITY
   ============================================ */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

.skip-to-content {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary-color);
    color: var(--white);
    padding: var(--spacing-sm) var(--spacing-md);
    text-decoration: none;
    z-index: 10000;
    border-radius: 0 0 var(--radius-md) 0;
}

.skip-to-content:focus {
    top: 0;
}

*:focus-visible {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.d-none { display: none !important; }
.d-block { display: block !important; }
.d-flex { display: flex !important; }
.d-inline { display: inline !important; }
.d-inline-block { display: inline-block !important; }

.text-center { text-align: center !important; }
.text-left { text-align: left !important; }
.text-right { text-align: right !important; }

.m-0 { margin: 0 !important; }
.m-1 { margin: var(--spacing-xs) !important; }
.m-2 { margin: var(--spacing-sm) !important; }
.m-3 { margin: var(--spacing-md) !important; }
.m-4 { margin: var(--spacing-lg) !important; }
.m-5 { margin: var(--spacing-xl) !important; }

.p-0 { padding: 0 !important; }
.p-1 { padding: var(--spacing-xs) !important; }
.p-2 { padding: var(--spacing-sm) !important; }
.p-3 { padding: var(--spacing-md) !important; }
.p-4 { padding: var(--spacing-lg) !important; }
.p-5 { padding: var(--spacing-xl) !important; }

.mb-0 { margin-bottom: 0 !important; }
.mb-1 { margin-bottom: var(--spacing-xs) !important; }
.mb-2 { margin-bottom: var(--spacing-sm) !important; }
.mb-3 { margin-bottom: var(--spacing-md) !important; }
.mb-4 { margin-bottom: var(--spacing-lg) !important; }
.mb-5 { margin-bottom: var(--spacing-xl) !important; }

.mt-0 { margin-top: 0 !important; }
.mt-1 { margin-top: var(--spacing-xs) !important; }
.mt-2 { margin-top: var(--spacing-sm) !important; }
.mt-3 { margin-top: var(--spacing-md) !important; }
.mt-4 { margin-top: var(--spacing-lg) !important; }
.mt-5 { margin-top: var(--spacing-xl) !important; }

/* ============================================
   ENHANCED MOBILE RESPONSIVENESS
   ============================================ */

/* Standardized Container Padding */
@media (max-width: 768px) {
    .container-fluid {
        padding-left: 1rem;
        padding-right: 1rem;
    }

    /* Sticky form actions (mobile) */
    .has-sticky-actions {
        padding-bottom: calc(96px + env(safe-area-inset-bottom));
    }

    .edu-sticky-actions {
        position: fixed;
        left: 0;
        right: 0;
        bottom: 0;
        z-index: 1030;
        background: rgba(255, 255, 255, 0.98);
        border-top: 1px solid var(--gray-200);
        padding: 0.75rem 1rem calc(0.75rem + env(safe-area-inset-bottom));
        backdrop-filter: blur(8px);
    }

    .edu-sticky-actions .btn {
        margin-bottom: 0;
    }
    
    /* Page Headers - Stack on Mobile */
    .d-flex.flex-column.flex-sm-row {
        flex-direction: column !important;
        align-items: flex-start !important;
    }
    
    /* Stats Cards - Full Width on Mobile */
    .row.g-3 > [class*="col-"] {
        margin-bottom: 1rem;
    }
    
    /* Buttons - Full Width on Mobile (except in groups) */
    .d-flex.gap-2:not(.btn-group),
    .d-flex.gap-3:not(.btn-group) {
        flex-direction: column;
        width: 100%;
    }
    
    .d-flex.gap-2:not(.btn-group) > *,
    .d-flex.gap-3:not(.btn-group) > * {
        width: 100%;
    }
    
    /* Cards - Reduced Shadows on Mobile for Performance */
    .card {
        box-shadow: 0 1px 3px rgba(0,0,0,0.1) !important;
    }
    
    /* Tables - Better Mobile Scrolling for Large Datasets */
    .table-responsive {
        -webkit-overflow-scrolling: touch;
        border-radius: 0.5rem;
        /* Momentum scrolling for iOS */
        overflow-x: auto;
        overflow-y: auto;
        /* Smooth scrolling */
        scroll-behavior: smooth;
    }
    
    /* Enhanced scrollable containers for large datasets */
    .table-responsive[style*="max-height"],
    [class*="chart-table"],
    [class*="scrollable"] {
        -webkit-overflow-scrolling: touch;
        scroll-behavior: smooth;
        /* Better scrollbar visibility on mobile */
        scrollbar-width: thin;
        scrollbar-color: rgba(0,0,0,0.2) transparent;
    }
    
    /* Webkit scrollbar for mobile */
    .table-responsive::-webkit-scrollbar,
    [class*="chart-table"]::-webkit-scrollbar {
        width: 8px;
        height: 8px;
    }
    
    .table-responsive::-webkit-scrollbar-track,
    [class*="chart-table"]::-webkit-scrollbar-track {
        background: #f1f1f1;
        border-radius: 4px;
    }
    
    .table-responsive::-webkit-scrollbar-thumb,
    [class*="chart-table"]::-webkit-scrollbar-thumb {
        background: rgba(0,0,0,0.3);
        border-radius: 4px;
    }
    
    .table-responsive::-webkit-scrollbar-thumb:hover,
    [class*="chart-table"]::-webkit-scrollbar-thumb:hover {
        background: rgba(0,0,0,0.5);
    }
    
    /* Sticky columns optimization for mobile */
    .sticky-left,
    .sticky-right {
        position: sticky;
        z-index: 10;
    }
    
    @media (max-width: 768px) {
        .sticky-left {
            box-shadow: 2px 0 4px rgba(0,0,0,0.1);
        }
        
        .sticky-right {
            box-shadow: -2px 0 4px rgba(0,0,0,0.1);
        }
    }
    
    /* Profile Pictures - Smaller on Mobile */
    .rounded-circle[style*="width: 64px"],
    .rounded-circle[style*="width: 80px"] {
        width: 48px !important;
        height: 48px !important;
        font-size: 1.25rem !important;
    }
    
    /* Card Headers - Better Touch Targets */
    .card-header {
        padding: 0.75rem 1rem;
    }
    
    /* Form Controls - Better Touch Targets (iOS recommended) */
    .form-control,
    .form-select,
    .btn:not(.btn-sm) {
        min-height: 44px;
    }
    
    /* Spacing Adjustments */
    .mb-4 {
        margin-bottom: 1.5rem !important;
    }
    
    .py-4 {
        padding-top: 1rem !important;
        padding-bottom: 1rem !important;
    }
    
    /* Grid Gaps - Reduced on Mobile */
    .row.g-3,
    .row.g-4 {
        --bs-gutter-y: 1rem;
    }
}

/* Mobile visibility helpers */
.mobile-only {
    display: none !important;
}

@media (max-width: 768px) {
    .mobile-only {
        display: block !important;
    }
    
    .desktop-only {
        display: none !important;
    }
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

@keyframes scaleIn {
    from { transform: scale(0.95); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.fade-in {
    animation: fadeIn 0.3s ease-in-out;
}

.slide-up {
    animation: slideUp 0.3s ease-in-out;
}

.scale-in {
    animation: scaleIn 0.2s ease-in-out;
}

/* ============================================
   LOADING STATES
   ============================================ */
.loading {
    position: relative;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--gray-300);
    border-top: 2px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.spinner-border {
    display: inline-block;
    width: 2rem;
    height: 2rem;
    border: 0.25em solid var(--gray-300);
    border-right-color: transparent;
    border-radius: 50%;
    animation: spin 0.75s linear infinite;
}

.spinner-border-sm {
    width: 1rem;
    height: 1rem;
    border-width: 0.2em;
}

/* ============================================
   PERFORMANCE OPTIMIZATIONS
   ============================================ */
.card, .btn, .modal, .dropdown-menu {
    will-change: transform;
    transform: translateZ(0);
}

.hover-lift {
    backface-visibility: hidden;
    perspective: 1000px;
}

.avatar-container {
    position: relative;
    aspect-ratio: 1;
    overflow: hidden;
}

img[loading="lazy"] {
    opacity: 0;
    transition: opacity 0.3s;
}

img[loading="lazy"].loaded {
    opacity: 1;
}

/* ============================================
   PRINT STYLES
   ============================================ */
@media print {
    .navbar,
    .btn,
    .modal,
    .alert {
        display: none !important;
    }
    
    .card {
        border: 1px solid var(--gray-300) !important;
        box-shadow: none !important;
    }
    
    .table {
        border-collapse: collapse !important;
    }
    
    .table th,
    .table td {
        border: 1px solid var(--gray-300) !important;
    }
}

/* ============================================
   MODAL BACKDROP FIXES
   ============================================ */
.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1040;
    width: 100vw;
    height: 100vh;
    background-color: rgba(0, 0, 0, 0.5);
}

.modal-backdrop.fade {
    opacity: 0;
}

.modal-backdrop.show {
    opacity: 0.5;
}

/* Ensure modals are properly positioned */
.modal {
    z-index: 1050;
}

.modal.show {
    display: block !important;
}

/* Fix modal backdrop click to close */
.modal-backdrop {
    pointer-events: auto;
}

/* ============================================
   PARTICIPANT POLICY HTML (Quill export: ol + li[data-list])
   ============================================ */
.participant-policy-html ol {
    padding-left: 1.25rem;
}
.participant-policy-html ol li[data-list="bullet"],
.participant-policy-html ol li[data-list="unchecked"],
.participant-policy-html ol li[data-list="checked"] {
    list-style-type: disc;
}
.participant-policy-html ol li[data-list="ordered"] {
    list-style-type: decimal;
}
/* Quill indent/align classes (preserved at sanitize for editor round-trip; mirror .ql-editor rules) */
.participant-policy-html .ql-indent-1:not(.ql-direction-rtl) {
    padding-left: 3em;
}
.participant-policy-html .ql-indent-2:not(.ql-direction-rtl) {
    padding-left: 6em;
}
.participant-policy-html .ql-indent-3:not(.ql-direction-rtl) {
    padding-left: 9em;
}
.participant-policy-html .ql-indent-4:not(.ql-direction-rtl) {
    padding-left: 12em;
}
.participant-policy-html .ql-indent-5:not(.ql-direction-rtl) {
    padding-left: 15em;
}
.participant-policy-html .ql-indent-6:not(.ql-direction-rtl) {
    padding-left: 18em;
}
.participant-policy-html .ql-indent-7:not(.ql-direction-rtl) {
    padding-left: 21em;
}
.participant-policy-html .ql-indent-8:not(.ql-direction-rtl) {
    padding-left: 24em;
}
.participant-policy-html .ql-align-center {
    text-align: center;
}
.participant-policy-html .ql-align-right {
    text-align: right;
}
.participant-policy-html .ql-align-justify {
    text-align: justify;
}
.participant-policy-html .ql-align-left {
    text-align: left;
}