/* ========================================================================
   LUMSAS PREMIUM MOBILE-RESPONSIVE FRAMEWORK
   Universal CSS for Mobile-First Design Across All Pages
   Preserves Desktop Experience, Enhances Mobile UX
   ======================================================================== */

/* ===================== MOBILE-FIRST BASE RESETS ===================== */
* {
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    -ms-text-size-adjust: 100%;
}

body {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

/* ===================== DESKTOP MODE - PRESERVE DESKTOP SPACING ===================== */
@media (min-width: 1025px) {
    /* Preserve desktop padding-top for fixed headers */
    /* DO NOT override body padding-top on desktop - let page-specific styles handle it */

    /* Hide any mobile nav bars on desktop */
    .mobile-nav-bar {
        display: none !important;
    }
}

/* ===================== RESPONSIVE CONTAINER SYSTEM ===================== */
.container-responsive {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1rem;
}

@media (min-width: 640px) {
    .container-responsive {
        padding: 0 1.5rem;
    }
}

@media (min-width: 1024px) {
    .container-responsive {
        padding: 0 2rem;
    }
}

/* ===================== MOBILE NAVIGATION ENHANCEMENTS ===================== */
@media (max-width: 768px) {
    /* Fix body padding for mobile nav */
    body {
        padding-top: 64px !important;
    }

    /* Sticky header optimization */
    .header-nav,
    .navbar,
    .top-navbar {
        position: fixed !important;
        top: 0 !important;
        left: 0 !important;
        right: 0 !important;
        z-index: 1000 !important;
        height: 64px !important;
        padding: 0.75rem 1rem !important;
        background: rgba(255, 255, 255, 0.95) !important;
        backdrop-filter: blur(20px) !important;
        -webkit-backdrop-filter: blur(20px) !important;
        border-bottom: 1px solid rgba(0, 0, 0, 0.06) !important;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04) !important;
    }

    /* Mobile Navigation Bar (auto-created for pages without nav) */
    .mobile-nav-bar {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        height: 64px;
        background: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border-bottom: 1px solid rgba(0, 0, 0, 0.06);
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
        z-index: 1000;
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 0 1rem;
    }

    .mobile-nav-bar .logo {
        height: 32px;
        display: flex;
        align-items: center;
        gap: 0.5rem;
        font-weight: 700;
        font-size: 1.25rem;
        background: linear-gradient(135deg, #6366F1 0%, #9333ea 100%);
        -webkit-background-clip: text;
        background-clip: text;
        -webkit-text-fill-color: transparent;
    }

    .mobile-nav-bar .logo img {
        height: 32px;
        width: auto;
    }

    /* Mobile menu burger */
    .mobile-menu-toggle {
        display: flex !important;
        align-items: center;
        justify-content: center;
        width: 44px;
        height: 44px;
        border-radius: 10px;
        background: rgba(99, 102, 241, 0.08);
        border: none;
        cursor: pointer;
        transition: all 0.3s ease;
        color: #6366F1;
    }

    .mobile-menu-toggle:active {
        transform: scale(0.95);
        background: rgba(99, 102, 241, 0.15);
    }

    .mobile-menu-toggle i,
    .mobile-menu-toggle svg {
        font-size: 1.25rem;
    }

    /* Hide desktop nav items by default on mobile */
    .nav-items-desktop {
        display: none !important;
    }

    /* Mobile menu overlay */
    .mobile-menu {
        position: fixed;
        top: 64px;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        z-index: 999;
        padding: 1.5rem;
        overflow-y: auto;
        transform: translateX(100%);
        transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }

    .mobile-menu.active {
        transform: translateX(0);
    }

    .mobile-menu-item {
        display: block;
        padding: 1rem 1.25rem;
        margin-bottom: 0.5rem;
        border-radius: 14px;
        font-size: 1rem;
        font-weight: 500;
        color: var(--text-dark, #1D1D1F);
        text-decoration: none;
        background: white;
        border: 1px solid rgba(0, 0, 0, 0.06);
        transition: all 0.2s ease;
    }

    .mobile-menu-item:active {
        transform: scale(0.98);
        background: #F5F5F7;
    }

    .mobile-menu-item.active {
        background: linear-gradient(135deg, #6366F1 0%, #9333ea 100%);
        color: white;
        border-color: transparent;
    }

    /* Mobile menu group labels (for admin navigation) */
    .mobile-menu-group-label {
        font-size: 0.75rem;
        font-weight: 700;
        text-transform: uppercase;
        letter-spacing: 0.05em;
        color: rgba(0, 0, 0, 0.4);
        padding: 1.5rem 0.5rem 0.5rem 0.5rem;
        margin-top: 0.5rem;
    }

    .mobile-menu-group-label:first-child {
        padding-top: 0.5rem;
        margin-top: 0;
    }
}

/* ===================== RESPONSIVE GRID SYSTEM ===================== */
@media (max-width: 768px) {
    /* Force single column on mobile for grid layouts */
    .grid-cols-2,
    .grid-cols-3,
    .grid-cols-4,
    .md\:grid-cols-2,
    .md\:grid-cols-3,
    .lg\:grid-cols-3,
    .lg\:grid-cols-4 {
        grid-template-columns: 1fr !important;
    }

    /* Stats grid optimization */
    .stats-grid {
        grid-template-columns: 1fr !important;
        gap: 1rem !important;
    }

    /* Exam cards grid */
    .exams-grid,
    .exam-cards {
        grid-template-columns: 1fr !important;
        gap: 1rem !important;
    }
}

/* ===================== CARD & MODAL RESPONSIVE BEHAVIOR ===================== */
@media (max-width: 768px) {
    /* Card adaptations */
    .glass-card,
    .card,
    .exam-card {
        border-radius: 16px !important;
        padding: 1.25rem !important;
        margin-bottom: 1rem;
    }

    /* Modal adaptations for mobile */
    .modal-content,
    .modal-dialog {
        max-width: 95vw !important;
        margin: 1rem auto !important;
        border-radius: 20px !important;
    }

    .modal {
        padding: 0.5rem !important;
    }

    .modal-header {
        padding: 1.25rem !important;
        flex-wrap: wrap;
    }

    .modal-title {
        font-size: 1.1rem !important;
    }

    .modal-body {
        padding: 1.25rem !important;
    }

    .modal-footer {
        padding: 1.25rem !important;
        flex-direction: column-reverse;
        gap: 0.75rem;
    }

    .modal-footer button {
        width: 100% !important;
    }
}

/* ===================== FORM OPTIMIZATIONS ===================== */
@media (max-width: 768px) {
    /* Input fields */
    .form-input,
    .form-input-light,
    .form-control,
    input[type="text"],
    input[type="email"],
    input[type="password"],
    input[type="tel"],
    input[type="number"],
    input[type="date"],
    select,
    textarea {
        font-size: 16px !important; /* Prevents zoom on iOS */
        padding: 0.875rem 1rem !important;
        border-radius: 12px !important;
    }

    /* Form labels */
    .form-label,
    label {
        font-size: 0.875rem !important;
        margin-bottom: 0.5rem !important;
    }

    /* Form groups spacing */
    .form-group {
        margin-bottom: 1.25rem !important;
    }

    /* Buttons full width on mobile */
    .btn-primary,
    .btn-complete,
    .btn-submit,
    button[type="submit"] {
        width: 100% !important;
        padding: 1rem 1.5rem !important;
        font-size: 1rem !important;
    }

    /* Button groups stack vertically */
    .button-group,
    .btn-group {
        flex-direction: column !important;
        gap: 0.75rem !important;
    }

    .button-group > *,
    .btn-group > * {
        width: 100% !important;
    }
}

/* ===================== TABLE RESPONSIVE BEHAVIOR ===================== */
@media (max-width: 768px) {
    /* Tables become card-based on mobile */
    .table-responsive {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        border-radius: 12px;
    }

    table {
        min-width: 600px; /* Allow horizontal scroll for complex tables */
    }

    /* Alternative: Stack table rows as cards */
    .table-mobile-cards thead {
        display: none;
    }

    .table-mobile-cards,
    .table-mobile-cards tbody,
    .table-mobile-cards tr,
    .table-mobile-cards td {
        display: block;
        width: 100%;
    }

    .table-mobile-cards tr {
        margin-bottom: 1rem;
        padding: 1rem;
        background: white;
        border-radius: 12px;
        box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    }

    .table-mobile-cards td {
        padding: 0.5rem 0;
        border: none;
        text-align: left !important;
    }

    .table-mobile-cards td:before {
        content: attr(data-label);
        font-weight: 600;
        display: block;
        margin-bottom: 0.25rem;
        color: #6E6E73;
        font-size: 0.75rem;
        text-transform: uppercase;
        letter-spacing: 0.5px;
    }
}

/* ===================== SIDEBAR RESPONSIVE BEHAVIOR ===================== */
@media (max-width: 1024px) {
    /* Creator/Admin sidebars become off-canvas */
    .sidebar,
    .creator-sidebar,
    .admin-sidebar {
        position: fixed !important;
        left: -280px;
        top: 64px;
        bottom: 0;
        width: 280px;
        z-index: 90;
        background: white;
        box-shadow: 4px 0 12px rgba(0,0,0,0.1);
        transition: left 0.3s cubic-bezier(0.16, 1, 0.3, 1);
        overflow-y: auto;
    }

    .sidebar.active,
    .creator-sidebar.active,
    .admin-sidebar.active {
        left: 0;
    }

    /* Sidebar overlay */
    .sidebar-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.4);
        z-index: 89;
        backdrop-filter: blur(2px);
    }

    .sidebar-overlay.active {
        display: block;
    }

    /* Main content shifts when sidebar present */
    .main-content,
    .page-content,
    .content-wrapper,
    main {
        margin-left: 0 !important;
        margin-top: 0 !important;
        padding: 1rem !important;
        padding-top: 1rem !important;
    }

    /* Sidebar toggle button */
    .sidebar-toggle {
        display: flex !important;
        align-items: center;
        justify-content: center;
        width: 44px;
        height: 44px;
        border-radius: 10px;
        background: rgba(99, 102, 241, 0.08);
        border: none;
        cursor: pointer;
        color: #6366F1;
    }

    .sidebar-toggle:active {
        transform: scale(0.95);
        background: rgba(99, 102, 241, 0.15);
    }
}

/* ===================== TYPOGRAPHY MOBILE SCALING ===================== */
@media (max-width: 768px) {
    h1, .h1 {
        font-size: 1.75rem !important;
        line-height: 1.2 !important;
    }

    h2, .h2 {
        font-size: 1.5rem !important;
        line-height: 1.3 !important;
    }

    h3, .h3 {
        font-size: 1.25rem !important;
        line-height: 1.4 !important;
    }

    h4, .h4 {
        font-size: 1.1rem !important;
        line-height: 1.4 !important;
    }

    h5, .h5, h6, .h6 {
        font-size: 1rem !important;
        line-height: 1.5 !important;
    }

    p, .text-base {
        font-size: 0.9375rem !important;
        line-height: 1.6 !important;
    }

    .text-sm, small {
        font-size: 0.875rem !important;
    }

    .text-xs {
        font-size: 0.8125rem !important;
    }
}

/* ===================== SPACING & PADDING MOBILE ADJUSTMENTS ===================== */
@media (max-width: 768px) {
    .page-header {
        padding: 1.5rem 1rem !important;
        margin-bottom: 1.5rem !important;
    }

    .section-padding {
        padding: 2rem 1rem !important;
    }

    .card-padding {
        padding: 1.25rem !important;
    }

    /* Reduce excessive spacing */
    .mb-6, .my-6 {
        margin-bottom: 1.5rem !important;
    }

    .mt-6 {
        margin-top: 1.5rem !important;
    }

    .p-6 {
        padding: 1.25rem !important;
    }

    .px-6 {
        padding-left: 1rem !important;
        padding-right: 1rem !important;
    }

    .py-6 {
        padding-top: 1.5rem !important;
        padding-bottom: 1.5rem !important;
    }
}

/* ===================== CAROUSEL/SLIDER MOBILE OPTIMIZATION ===================== */
@media (max-width: 768px) {
    .carousel,
    .slider,
    .exam-carousel {
        padding: 0 !important;
    }

    .carousel-item,
    .slider-item {
        padding: 0 0.5rem !important;
    }

    .carousel-controls {
        display: none; /* Hide prev/next on mobile, use swipe */
    }

    /* Enable touch scrolling */
    .carousel-inner,
    .slider-wrapper {
        overflow-x: auto;
        scroll-snap-type: x mandatory;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
    }

    .carousel-inner::-webkit-scrollbar,
    .slider-wrapper::-webkit-scrollbar {
        display: none;
    }

    .carousel-item,
    .slider-item {
        scroll-snap-align: start;
    }
}

/* ===================== IMAGES & MEDIA RESPONSIVE ===================== */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

@media (max-width: 768px) {
    .profile-picture,
    .avatar,
    .user-avatar {
        width: 64px !important;
        height: 64px !important;
    }

    .logo {
        max-height: 32px !important;
    }

    .icon-lg {
        width: 48px !important;
        height: 48px !important;
    }
}

/* ===================== FLEX UTILITIES FOR MOBILE ===================== */
@media (max-width: 768px) {
    .flex-mobile-column {
        flex-direction: column !important;
    }

    .flex-mobile-wrap {
        flex-wrap: wrap !important;
    }

    .gap-mobile-small {
        gap: 0.75rem !important;
    }

    /* Reverse order on mobile when needed */
    .mobile-reverse {
        flex-direction: column-reverse !important;
    }
}

/* ===================== UTILITY VISIBILITY CLASSES ===================== */
@media (max-width: 768px) {
    .hide-mobile {
        display: none !important;
    }

    .show-mobile {
        display: block !important;
    }

    .show-mobile-flex {
        display: flex !important;
    }

    .show-mobile-inline {
        display: inline !important;
    }

    .show-mobile-inline-block {
        display: inline-block !important;
    }
}

@media (min-width: 769px) {
    .show-mobile,
    .show-mobile-flex,
    .show-mobile-inline,
    .show-mobile-inline-block {
        display: none !important;
    }

    .hide-desktop {
        display: none !important;
    }
}

/* ===================== TOUCH-FRIENDLY INTERACTIONS ===================== */
@media (max-width: 768px) {
    /* Increase touch targets */
    button,
    a,
    input[type="checkbox"],
    input[type="radio"],
    .clickable {
        min-height: 44px; /* Apple's recommended minimum */
        min-width: 44px;
    }

    /* Better active states for touch */
    button:active,
    .btn:active,
    a:active {
        transform: scale(0.97);
        opacity: 0.8;
    }
}

/* ===================== BOTTOM NAVIGATION (MOBILE APP STYLE) ===================== */
@media (max-width: 768px) {
    .bottom-nav {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border-top: 1px solid rgba(0, 0, 0, 0.06);
        z-index: 100;
        padding: 0.75rem 0 calc(0.75rem + env(safe-area-inset-bottom));
        box-shadow: 0 -4px 12px rgba(0,0,0,0.04);
    }

    .bottom-nav-items {
        display: flex;
        justify-content: space-around;
        align-items: center;
        max-width: 600px;
        margin: 0 auto;
        padding: 0 1rem;
    }

    .bottom-nav-item {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 0.25rem;
        padding: 0.5rem;
        text-decoration: none;
        color: #6E6E73;
        font-size: 0.6875rem;
        font-weight: 500;
        border-radius: 12px;
        transition: all 0.2s ease;
        min-width: 64px;
    }

    .bottom-nav-item i,
    .bottom-nav-item svg {
        font-size: 1.25rem;
        width: 24px;
        height: 24px;
    }

    .bottom-nav-item.active {
        color: #6366F1;
        background: rgba(99, 102, 241, 0.08);
    }

    .bottom-nav-item:active {
        transform: scale(0.95);
    }

    /* Add padding to body when bottom nav is present */
    body.has-bottom-nav {
        padding-bottom: calc(72px + env(safe-area-inset-bottom)) !important;
    }
}

/* ===================== SAFE AREA INSETS (iOS NOTCH/HOME INDICATOR) ===================== */
@media (max-width: 768px) {
    @supports (padding: env(safe-area-inset-top)) {
        body {
            padding-top: max(80px, calc(80px + env(safe-area-inset-top))) !important;
        }

        .header-nav,
        .navbar,
        .top-navbar {
            padding-top: env(safe-area-inset-top);
        }

        .sidebar,
        .mobile-menu {
            padding-bottom: env(safe-area-inset-bottom);
        }
    }
}

/* ===================== LANDSCAPE MOBILE OPTIMIZATIONS ===================== */
@media (max-width: 900px) and (orientation: landscape) {
    body {
        padding-top: 56px !important;
    }

    .header-nav,
    .navbar {
        height: 56px !important;
        padding: 0.5rem 1rem !important;
    }

    .mobile-menu {
        top: 56px;
    }

    /* Reduce modal heights in landscape */
    .modal-content {
        max-height: 80vh !important;
        overflow-y: auto;
    }
}

/* ===================== LOADING & SKELETON STATES ===================== */
@media (max-width: 768px) {
    .skeleton,
    .loading-placeholder {
        border-radius: 12px !important;
        height: 120px !important;
    }

    .spinner,
    .loader {
        width: 40px !important;
        height: 40px !important;
    }
}

/* ===================== PREMIUM ANIMATIONS & TRANSITIONS ===================== */
@media (prefers-reduced-motion: no-preference) {
    .fade-in-up {
        animation: fadeInUp 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    }

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

    .slide-in-right {
        animation: slideInRight 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    }

    @keyframes slideInRight {
        from {
            transform: translateX(100%);
        }
        to {
            transform: translateX(0);
        }
    }
}

/* Disable animations for users who prefer reduced motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ===================== PRINT STYLES ===================== */
@media print {
    .header-nav,
    .navbar,
    .sidebar,
    .bottom-nav,
    .mobile-menu-toggle,
    .btn,
    button {
        display: none !important;
    }

    body {
        padding: 0 !important;
    }

    .main-content {
        margin: 0 !important;
        padding: 0 !important;
    }
}

/* ===================== DARK MODE SUPPORT (FUTURE-PROOFING) ===================== */
@media (prefers-color-scheme: dark) {
    /* Optionally add dark mode support here in future updates */
}

/* ===================== HIGH DPI / RETINA DISPLAYS ===================== */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    /* Optimize for retina displays */
    img {
        image-rendering: -webkit-optimize-contrast;
    }
}

/* ===================== ACCESSIBILITY IMPROVEMENTS ===================== */
/* Focus visible for keyboard navigation */
*:focus-visible {
    outline: 2px solid #6366F1;
    outline-offset: 2px;
    border-radius: 4px;
}

/* Skip to main content link */
.skip-to-main {
    position: absolute;
    top: -100px;
    left: 0;
    background: #6366F1;
    color: white;
    padding: 0.75rem 1.5rem;
    border-radius: 0 0 8px 0;
    z-index: 1000;
    font-weight: 600;
}

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

/* Screen reader only content */
.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;
}

/* ===================== END OF MOBILE PREMIUM FRAMEWORK ===================== */