/* ==========================================================================
   RESPONSIVE SYSTEM — 4LAZIE Student Portal
   --------------------------------------------------------------------------
   Standards followed:
   • Material Design 3 (Google) — 8dp grid, adaptive layouts
   • Apple Human Interface Guidelines — safe areas, touch targets 44pt+
   • WCAG 2.1 AA — 4.5:1 contrast, 44×44px touch targets, focus indicators
   • W3C CSS Media Queries Level 4
   • Bootstrap 5 breakpoints compatible

   BREAKPOINTS (mobile-first):
     xs  < 360px  — Very small phones (Nokia, older Android)
     sm  ≥ 576px  — Small phones (iPhone SE, Galaxy A series)
     md  ≥ 768px  — Tablets (iPad Mini, small tablets)
     lg  ≥ 992px  — Large tablets / small laptops
     xl  ≥ 1200px — Desktops
     xxl ≥ 1400px — Large desktops / TVs

   ========================================================================== */

/* ==========================================================================
   1. VIEWPORT & ROOT SETTINGS
   ========================================================================== */

:root {
    /* Responsive Spacing Scale (8dp grid) */
    --rs-space-1:  4px;
    --rs-space-2:  8px;
    --rs-space-3:  12px;
    --rs-space-4:  16px;
    --rs-space-5:  20px;
    --rs-space-6:  24px;
    --rs-space-7:  32px;
    --rs-space-8:  40px;
    --rs-space-9:  48px;
    --rs-space-10: 64px;

    /* Touch Target Sizes */
    --rs-touch-min: 44px;      /* Apple HIG minimum */
    --rs-touch-md:  48px;      /* Material Design 3 */
    --rs-touch-lg:  56px;      /* Material Design 3 Large */

    /* Layout Widths */
    --rs-sidebar-width: 280px;
    --rs-navbar-height-mobile: 60px;
    --rs-navbar-height-desktop: 72px;
    --rs-bottom-nav-height: 72px;

    /* Content Max Widths */
    --rs-content-max-sm:  540px;
    --rs-content-max-md:  720px;
    --rs-content-max-lg:  960px;
    --rs-content-max-xl:  1140px;
    --rs-content-max-xxl: 1320px;

    /* Fluid Typography Clamps */
    --rs-font-xs:   clamp(0.7rem,  2vw, 0.8rem);
    --rs-font-sm:   clamp(0.8rem,  2.5vw, 0.875rem);
    --rs-font-base: clamp(0.9rem,  3vw, 1rem);
    --rs-font-md:   clamp(1rem,    3.5vw, 1.125rem);
    --rs-font-lg:   clamp(1.1rem,  4vw, 1.25rem);
    --rs-font-xl:   clamp(1.3rem,  4.5vw, 1.5rem);
    --rs-font-2xl:  clamp(1.5rem,  5vw, 2rem);
    --rs-font-3xl:  clamp(1.8rem,  6vw, 2.5rem);
    --rs-font-hero: clamp(2rem,    8vw, 3.5rem);

    /* Gutters */
    --rs-gutter-mobile:  16px;
    --rs-gutter-tablet:  24px;
    --rs-gutter-desktop: 32px;
    --rs-gutter-xl:      48px;
}

/* ==========================================================================
   1.5. FLUID SPACING & OVERRIDES (International Standard)
   ========================================================================== */

/* Fluid Padding Classes */
.padding-fluid { padding: clamp(16px, 3vw, 32px) !important; }
.padding-fluid-lg { padding: clamp(20px, 4vw, 40px) !important; }
.padding-fluid-sm { padding: clamp(12px, 2vw, 24px) !important; }

/* Margins */
.margin-fluid { margin: clamp(16px, 3vw, 32px) !important; }
.gap-fluid { gap: clamp(16px, 3vw, 32px) !important; }

/* Global Override for Hardcoded Inline Padding in Legacy Templates 
   This safely converts rigid 20px/30px padding into fluid, responsive padding 
   on major container elements. */
.position-relative[style*="padding: 20px"],
.center-col[style*="padding: 20px"],
.main-content [style*="padding: 20px"] {
    padding: clamp(16px, 3vw, 32px) !important;
}

.position-relative[style*="padding: 30px"],
.main-content [style*="padding: 30px"] {
    padding: clamp(20px, 4vw, 40px) !important;
}

@media (max-width: 768px) {
    /* Enforce safe mobile padding globally for structural panels */
    .glass-panel, .premium-card, .position-relative[style*="padding"] {
        padding: 16px !important;
    }
}

/* ==========================================================================
   2. BASE RESPONSIVE LAYOUT
   ========================================================================== */

/* Prevent horizontal overflow globally */
html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

body {
    min-width: 320px; /* Minimum supported width */
}

/* All images are responsive by default */
img, video, iframe, embed, object {
    max-width: 100%;
    height: auto;
}

/* ==========================================================================
   3. PAGE LAYOUT — SIDEBAR + MAIN CONTENT
   ========================================================================== */

/* Desktop: Sidebar is always visible */
.page-layout {
    display: flex;
    flex: 1;
    position: relative;
    width: 100%;
    min-height: calc(100vh - var(--rs-navbar-height-desktop));
}

/* Sidebar — Desktop Fixed */
.hero-sidebar {
    width: var(--rs-sidebar-width);
    min-width: var(--rs-sidebar-width);
    position: sticky;
    top: var(--rs-navbar-height-desktop);
    height: calc(100vh - var(--rs-navbar-height-desktop));
    overflow-y: auto;
    overflow-x: hidden;
    flex-shrink: 0;
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1),
                transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: transform, width;
    scrollbar-width: thin;
    scrollbar-color: rgba(255,255,255,0.15) transparent;
}

/* Sidebar — Collapsed State (Desktop Toggle) */
.hero-sidebar.collapsed {
    width: 0;
    min-width: 0;
    overflow: hidden;
}

/* Main Content */
.main-content {
    flex: 1;
    min-width: 0; /* Prevents flex overflow */
    display: flex;
    flex-direction: column;
    transition: margin-left 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
    /* NOTE: do not add `overflow-x: hidden` here. It clips decorative
       elements that bleed past their edges (which is otherwise correct),
       but per the CSS overflow spec, constraining one axis forces the
       other to become a scroll container too, which broke vertical
       scrolling on mobile — see commit b98cfe1, which reverted this same
       fix from user/dashboard.html and global-premium.css for that exact
       reason. Fix overflow culprits (e.g. ambient background blobs) at
       the source by giving them their own clipping wrapper instead. */
}

/* Sidebar Push Effect */
body.sidebar-open-push .main-content {
    margin-left: 280px;
}
body.sidebar-open-push .offcanvas-backdrop {
    opacity: 0 !important;
}

/* ==========================================================================
   4. MOBILE SIDEBAR (Offcanvas) — ≤ 991px
   ========================================================================== */

@media (max-width: 991.98px) {
    /* Desktop sidebar is hidden on mobile/tablet */
    .hero-sidebar {
        position: fixed;
        top: 0;
        left: 0;
        height: 100vh;
        z-index: 1055;
        transform: translateX(-100%);
        /* Override sticky top for mobile */
        --sticky-top: 0;
    }

    .hero-sidebar.active {
        transform: translateX(0);
    }

    /* Main content takes full width */
    .main-content {
        width: 100%;
    }

    /* Page layout stacks vertically on mobile */
    .page-layout {
        flex-direction: column;
        min-height: calc(100vh - var(--rs-navbar-height-mobile));
    }
}

/* ==========================================================================
   5. NAVBAR — RESPONSIVE
   ========================================================================== */

/* Navbar base */
nav.navbar,
.top-navbar {
    height: var(--rs-navbar-height-desktop);
    padding: 0 var(--rs-gutter-desktop);
    position: sticky;
    top: 0;
    z-index: 1040;
    width: 100%;
}

@media (max-width: 767.98px) {
    nav.navbar,
    .top-navbar {
        height: var(--rs-navbar-height-mobile);
        padding: 0 var(--rs-gutter-mobile);
    }

    /* Navbar brand text — hide NOTES on mobile */
    .navbar-brand .d-sm-inline {
        display: none !important;
    }
}

@media (max-width: 575.98px) {
    nav.navbar,
    .top-navbar {
        padding: 0 12px;
    }
}

/* Navbar action-icon cluster — shrink so search + messages + notifications +
   profile fit next to the hamburger/brand without forcing horizontal scroll.
   Measured overflow on a 375px viewport was ~85px before this rule. */
@media (max-width: 480px) {
    nav.navbar button[data-bs-target="#mobileSidebar"] {
        width: 34px !important;
        height: 34px !important;
        margin-right: 6px !important;
    }

    .navbar-brand > div {
        padding: 5px 8px !important;
        margin-right: 4px !important;
    }

    .navbar-brand span {
        font-size: 1rem !important;
        letter-spacing: 1px !important;
    }

    nav.navbar .d-flex[style*="gap"] {
        gap: 0.3rem !important;
    }

    #mobileSearchToggleBtn {
        width: 34px !important;
        height: 34px !important;
    }

    .top-action-btn,
    .notification-trigger {
        width: 36px !important;
        height: 36px !important;
        margin-right: 0 !important;
    }

    .top-action-btn i,
    .notification-trigger i {
        font-size: 1.05rem !important;
    }

    .profile-pic-trigger {
        width: 32px !important;
        height: 32px !important;
    }
}

/* ==========================================================================
   6. TYPOGRAPHY — FLUID RESPONSIVE
   ========================================================================== */

/* Fluid heading sizes */
h1, .h1 { font-size: var(--rs-font-hero); line-height: 1.1; }
h2, .h2 { font-size: var(--rs-font-3xl);  line-height: 1.15; }
h3, .h3 { font-size: var(--rs-font-2xl);  line-height: 1.2; }
h4, .h4 { font-size: var(--rs-font-xl);   line-height: 1.25; }
h5, .h5 { font-size: var(--rs-font-lg);   line-height: 1.3; }
h6, .h6 { font-size: var(--rs-font-md);   line-height: 1.35; }

/* Override Bootstrap heading sizes for mobile */
@media (max-width: 767.98px) {
    h1, .h1 { font-size: clamp(1.75rem, 7vw, 2.25rem) !important; }
    h2, .h2 { font-size: clamp(1.5rem,  6vw, 1.875rem) !important; }
    h3, .h3 { font-size: clamp(1.25rem, 5vw, 1.5rem)  !important; }
    h4, .h4 { font-size: clamp(1.1rem,  4.5vw, 1.25rem) !important; }
    h5, .h5 { font-size: clamp(1rem,    4vw, 1.125rem)  !important; }
    h6, .h6 { font-size: clamp(0.9rem,  3.5vw, 1rem)   !important; }
}

/* Body text */
p, .body-text {
    font-size: var(--rs-font-base);
    line-height: 1.6;
}

/* Small text — never below 12px (WCAG) */
small, .text-small, .text-xs {
    font-size: max(0.75rem, 12px);
}

/* ==========================================================================
   7. BUTTONS — TOUCH TARGETS (WCAG 2.1 SC 2.5.5)
   ========================================================================== */

/* All interactive elements must be at least 44px tall */
button,
.btn,
a.btn,
[role="button"],
input[type="submit"],
input[type="button"],
input[type="reset"] {
    min-height: var(--rs-touch-min); /* 44px */
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation; /* Disables 300ms delay on mobile */
}

/* Full width buttons on mobile */
@media (max-width: 575.98px) {
    .btn-mobile-full {
        width: 100% !important;
        justify-content: center;
    }

    /* Stack button groups vertically on very small screens */
    .btn-group-mobile-stack {
        flex-direction: column !important;
        width: 100%;
    }

    .btn-group-mobile-stack > .btn {
        width: 100%;
        border-radius: 12px !important;
        margin: 4px 0;
    }
}

/* ==========================================================================
   8. FORM INPUTS — RESPONSIVE
   ========================================================================== */

/* All inputs get proper touch targets */
input[type="text"],
input[type="email"],
input[type="password"],
input[type="search"],
input[type="tel"],
input[type="url"],
input[type="number"],
input[type="date"],
textarea,
select,
.form-control,
.form-select,
.premium-input {
    min-height: var(--rs-touch-min); /* 44px */
    font-size: max(1rem, 16px); /* Prevents iOS zoom on focus */
    width: 100%;
    box-sizing: border-box;
}

/* iOS prevents zoom if font-size ≥ 16px */
@media (max-width: 767.98px) {
    input, textarea, select {
        font-size: 16px !important;
    }
}

/* ==========================================================================
   9. CARDS & GRID — RESPONSIVE
   ========================================================================== */

/* Responsive grid helper classes */
.rs-grid-1   { display: grid; grid-template-columns: 1fr; gap: var(--rs-space-4); }
.rs-grid-2   { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--rs-space-4); }
.rs-grid-3   { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--rs-space-4); }
.rs-grid-4   { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--rs-space-4); }
.rs-grid-auto { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: var(--rs-space-4); }

@media (max-width: 991.98px) {
    .rs-grid-4 { grid-template-columns: repeat(2, 1fr); }
    .rs-grid-3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 767.98px) {
    .rs-grid-4,
    .rs-grid-3,
    .rs-grid-2 { grid-template-columns: 1fr; }
    .rs-grid-auto { grid-template-columns: 1fr; }
}

/* Feature/stat cards responsive padding */
.feature-card,
.glass-stat-card,
.navigator-card,
.glassmorphism-card {
    padding: clamp(16px, 3vw, 24px);
}

@media (max-width: 575.98px) {
    .feature-card,
    .glass-stat-card,
    .navigator-card {
        padding: 16px !important;
        border-radius: 16px !important;
    }
}

/* ==========================================================================
   10. TABLES — RESPONSIVE (Mobile-friendly)
   ========================================================================== */

/* Horizontal scroll container for tables */
.table-responsive-wrapper {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: 16px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.04);
    /* Indicate scroll is available */
    background:
        linear-gradient(to right, white 30%, rgba(255,255,255,0)),
        linear-gradient(to right, rgba(255,255,255,0), white 70%) 0 100%,
        linear-gradient(to right, rgba(0,0,0,.06), rgba(0,0,0,0)),
        linear-gradient(to left,  rgba(0,0,0,.06), rgba(0,0,0,0)) 0 100%;
    background-repeat: no-repeat;
    background-size: 40px 100%, 40px 100%, 14px 100%, 14px 100%;
    background-attachment: local, local, scroll, scroll;
}

/* Ensure .table-responsive from Bootstrap also gets smooth scroll */
.table-responsive,
.table-responsive-sm,
.table-responsive-md,
.table-responsive-lg {
    -webkit-overflow-scrolling: touch;
}

/* Mobile card-style tables */
@media (max-width: 575.98px) {
    .table-mobile-card thead {
        display: none; /* Hide table headers on mobile */
    }

    .table-mobile-card tbody tr {
        display: block;
        background: white;
        border-radius: 12px;
        margin-bottom: 12px;
        box-shadow: 0 2px 8px rgba(0,0,0,0.06);
        border: 1px solid rgba(0,0,0,0.06);
        padding: 12px;
    }

    .table-mobile-card tbody td {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 8px 4px;
        border: none;
        border-bottom: 1px solid rgba(0,0,0,0.05);
        font-size: 0.875rem;
    }

    .table-mobile-card tbody td:last-child {
        border-bottom: none;
    }

    /* Label from data-label attribute */
    .table-mobile-card tbody td::before {
        content: attr(data-label);
        font-weight: 700;
        font-size: 0.75rem;
        text-transform: uppercase;
        letter-spacing: 0.5px;
        color: #64748b;
        flex-shrink: 0;
        margin-right: 8px;
    }
}

/* ==========================================================================
   11. MODAL — RESPONSIVE
   ========================================================================== */

@media (max-width: 575.98px) {
    .modal-dialog {
        margin: 8px;
        max-width: calc(100vw - 16px);
    }

    .modal-content {
        border-radius: 20px;
    }

    .modal-header {
        padding: 16px 20px;
    }

    .modal-body {
        padding: 16px 20px;
    }

    .modal-footer {
        padding: 12px 20px;
        flex-wrap: wrap;
        gap: 8px;
    }

    .modal-footer > * {
        flex: 1;
        min-width: 120px;
    }
}

/* Full-screen modal on very small screens */
@media (max-width: 400px) {
    .modal-dialog {
        margin: 0;
        max-width: 100%;
        height: 100%;
    }

    .modal-content {
        height: 100%;
        border-radius: 0;
    }
}

/* ==========================================================================
   12. DROPDOWN MENUS — RESPONSIVE
   ========================================================================== */

@media (max-width: 575.98px) {
    .dropdown-menu {
        position: fixed !important;
        top: auto !important;
        bottom: 0 !important;
        left: 0 !important;
        right: 0 !important;
        width: 100% !important;
        max-width: 100% !important;
        border-radius: 20px 20px 0 0 !important;
        margin: 0 !important;
        padding: 12px 0 calc(12px + env(safe-area-inset-bottom)) !important;
        transform: none !important;
        animation: slideUpSheet 0.3s cubic-bezier(0.4, 0, 0.2, 1) forwards;
        z-index: 1060;
        box-shadow: 0 -10px 40px rgba(0,0,0,0.15) !important;
    }

    @keyframes slideUpSheet {
        from { transform: translateY(100%); opacity: 0; }
        to   { transform: translateY(0);   opacity: 1; }
    }

    /* Add overlay handle */
    .dropdown-menu::before {
        content: '';
        display: block;
        width: 40px;
        height: 4px;
        background: #e2e8f0;
        border-radius: 2px;
        margin: 0 auto 12px;
    }

    .dropdown-item {
        padding: 14px 20px;
        font-size: 1rem;
        min-height: 52px;
        display: flex;
        align-items: center;
    }
}

/* Notification dropdown exception - keep position on small screens */
@media (max-width: 575.98px) {
    .notification-dropdown.dropdown-menu {
        position: fixed !important;
        right: 0 !important;
        left: 0 !important;
        bottom: 0 !important;
        top: auto !important;
        width: 100% !important;
        border-radius: 20px 20px 0 0 !important;
    }
    .dropdown-menu.profile-dropdown {
        position: absolute !important;
        top: 100% !important;
        bottom: auto !important;
        left: auto !important;
        right: 0 !important;
        width: 260px !important;
        border-radius: 24px !important;
        padding: 8px !important;
        margin-top: 10px !important;
        transform: none !important;
        box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15) !important;
    }
    .dropdown-menu.profile-dropdown::before {
        display: none !important;
    }
}

/* ==========================================================================
   13. FILTER BAR — RESPONSIVE
   ========================================================================== */

.premium-filter-container {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    align-items: center;
}

@media (max-width: 767.98px) {
    .premium-filter-container {
        flex-direction: column;
        align-items: stretch;
        gap: 10px;
        padding: 12px;
        border-radius: 16px;
    }

    .premium-filter-container > * {
        width: 100%;
    }

    .premium-sem-toggle {
        width: 100%;
    }
}

/* ==========================================================================
   14. NOTE/FILE LIST ROWS — RESPONSIVE
   ========================================================================== */

.note-row,
.glassmorphism-card {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 12px;
}

@media (max-width: 575.98px) {
    .note-row,
    .glassmorphism-card {
        flex-direction: column;
        align-items: flex-start;
    }

    .note-row .right-actions,
    .glassmorphism-card .right-actions {
        width: 100%;
        display: flex;
        gap: 8px;
    }

    .note-row .right-actions > *,
    .glassmorphism-card .right-actions > * {
        flex: 1;
    }
}

/* ==========================================================================
   15. CONTENT AREA PADDING — RESPONSIVE
   ========================================================================== */

.content-area,
.center-col {
    padding: var(--rs-gutter-desktop);
}

@media (max-width: 1199.98px) {
    .content-area,
    .center-col {
        padding: var(--rs-gutter-tablet);
    }
}

@media (max-width: 767.98px) {
    .content-area,
    .center-col {
        padding: var(--rs-gutter-mobile);
        padding-bottom: calc(var(--rs-bottom-nav-height) + var(--rs-gutter-mobile) + env(safe-area-inset-bottom));
    }
}

@media (max-width: 359.98px) {
    .content-area,
    .center-col {
        padding: 12px;
    }
}

/* ==========================================================================
   16. BOTTOM NAV PADDING
   ========================================================================== */

/* Ensure content is not hidden behind bottom nav on mobile */
body.has-bottom-nav {
    padding-bottom: 0; /* Reset, use margin on content instead */
}

@media (max-width: 991.98px) {
    body.has-bottom-nav .main-content {
        padding-bottom: calc(var(--rs-bottom-nav-height) + env(safe-area-inset-bottom, 16px));
    }
}

/* ==========================================================================
   17. SIDEBAR OVERLAY (Mobile Backdrop)
   ========================================================================== */

.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1054;
    backdrop-filter: blur(3px);
    -webkit-backdrop-filter: blur(3px);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.sidebar-overlay.active {
    display: block;
    opacity: 1;
}

/* ==========================================================================
   18. ACCESSIBILITY — FOCUS INDICATORS (WCAG 2.1 AA)
   ========================================================================== */

/* Visible focus for keyboard navigation */
:focus-visible {
    outline: 3px solid rgba(16, 185, 129, 0.6);
    outline-offset: 3px;
    border-radius: 4px;
}

/* Skip to content link */
.skip-to-content {
    position: absolute;
    top: -100%;
    left: 16px;
    background: #10b981;
    color: white;
    padding: 12px 24px;
    border-radius: 0 0 12px 12px;
    font-weight: 700;
    text-decoration: none;
    z-index: 9999;
    transition: top 0.2s ease;
}

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

/* ==========================================================================
   19. REDUCED MOTION — ACCESSIBILITY
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ==========================================================================
   20. PRINT STYLES
   ========================================================================== */

@media print {
    .hero-sidebar,
    .mobile-bottom-nav,
    .custom-mobile-nav-wrapper,
    nav.navbar,
    .top-navbar,
    .sidebar-overlay {
        display: none !important;
    }

    .main-content,
    .page-layout {
        display: block !important;
        width: 100% !important;
    }

    body {
        background: white !important;
        color: black !important;
    }
}

/* ==========================================================================
   21. UTILITY CLASSES — RESPONSIVE
   ========================================================================== */

/* Responsive text alignment */
@media (max-width: 767.98px) {
    .text-md-start { text-align: start !important; }
    .text-mobile-center { text-align: center !important; }
}

/* Responsive padding/margin helpers */
.px-mobile { padding-left: var(--rs-gutter-mobile) !important; padding-right: var(--rs-gutter-mobile) !important; }
.py-mobile { padding-top: var(--rs-space-4) !important; padding-bottom: var(--rs-space-4) !important; }

/* Truncate text to prevent overflow */
.text-truncate-2 {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.text-truncate-3 {
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Gap responsive */
.gap-mobile { gap: var(--rs-space-2) !important; }

@media (min-width: 768px) {
    .gap-mobile { gap: var(--rs-space-4) !important; }
}

/* Full-width on mobile only */
@media (max-width: 575.98px) {
    .w-mobile-100 { width: 100% !important; }
}

/* Hide on mobile / show on desktop */
.d-mobile-none { display: none; }
@media (min-width: 768px) { .d-mobile-none { display: initial; } }

.d-desktop-none { display: initial; }
@media (min-width: 768px) { .d-desktop-none { display: none; } }

/* ==========================================================================
   22. OFFCANVAS SIDEBAR (Bootstrap compatible)
   ========================================================================== */

/* Safety net: any offcanvas panel (exam-date modal, filters, etc.) must never
   widen the page's horizontal scroll bounds, even while translated off-screen
   and invisible. Non-wrapping flex content inside can otherwise force the
   panel wider than the viewport, which leaks into document.body.scrollWidth
   and lets the whole page be swiped sideways on mobile. */
.offcanvas {
    max-width: 100vw;
    overflow-x: hidden;
}

/* Override Bootstrap offcanvas for our sidebar */
#mobileSidebar.offcanvas {
    width: min(85vw, 320px);
    border-right: none;
}

#mobileSidebar.offcanvas-start {
    border-right: none;
    box-shadow: 5px 0 30px rgba(0,0,0,0.3);
}

#mobileSidebar .offcanvas-header {
    padding: 16px 20px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    min-height: var(--rs-navbar-height-mobile);
}

#mobileSidebar .offcanvas-body {
    padding: 0;
    overflow-y: auto;
    overflow-x: hidden;
    scrollbar-width: thin;
    scrollbar-color: rgba(255,255,255,0.15) transparent;
}

/* ==========================================================================
   23. ADMIN DASHBOARD — RESPONSIVE TABLES
   ========================================================================== */

@media (max-width: 767.98px) {
    /* Admin tables wrap */
    .admin-table-wrapper {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        margin: 0 -16px;
        padding: 0 16px;
    }

    .admin-table-wrapper table {
        min-width: 600px;
    }

    /* Admin cards stack */
    .admin-stat-grid {
        grid-template-columns: repeat(2, 1fr) !important;
    }
}

@media (max-width: 575.98px) {
    .admin-stat-grid {
        grid-template-columns: 1fr !important;
    }
}

/* ==========================================================================
   24. AUTHENTICATION PAGES — RESPONSIVE
   ========================================================================== */

.auth-container,
.login-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--rs-gutter-mobile);
}

/* Split layout: left graphic + right form */
.auth-layout {
    display: flex;
    width: 100%;
    max-width: 1100px;
    min-height: 100vh;
}

.auth-left.graphic-side {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: clamp(24px, 5vw, 60px);
}

.auth-right.form-side {
    flex: 0 0 min(50%, 480px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: clamp(24px, 5vw, 60px);
}

/* Mobile: hide graphic, show form full-width */
@media (max-width: 899.98px) {
    .auth-layout {
        flex-direction: column;
    }

    .auth-left.graphic-side {
        display: none; /* Hide illustration on mobile */
    }

    .auth-right.form-side {
        flex: 1;
        max-width: 100%;
        width: 100%;
        min-height: 100vh;
        padding: clamp(20px, 5vw, 40px);
    }
}

/* Auth form box */
.login-box,
.glass-pane.login-box {
    width: 100%;
    max-width: 420px;
    padding: clamp(24px, 5vw, 48px) clamp(20px, 4vw, 40px);
}

@media (max-width: 575.98px) {
    .login-box,
    .glass-pane.login-box {
        padding: 24px 20px;
        border-radius: 20px;
    }
}

/* ==========================================================================
   25. HERO SECTIONS — RESPONSIVE
   ========================================================================== */

.hero-section {
    min-height: clamp(400px, 60vh, 700px);
    padding: clamp(40px, 8vh, 120px) var(--rs-gutter-mobile);
}

@media (min-width: 768px) {
    .hero-section {
        padding: clamp(60px, 10vh, 140px) var(--rs-gutter-desktop);
    }
}

/* Hero text */
.hero-text h1 {
    font-size: clamp(2rem, 7vw, 4rem);
    line-height: 1.1;
}

.hero-text p {
    font-size: clamp(1rem, 3vw, 1.25rem);
}

/* ==========================================================================
   26. TOAST NOTIFICATIONS — RESPONSIVE
   ========================================================================== */

.premium-toast-container {
    position: fixed;
    z-index: 9999;
    pointer-events: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

/* Desktop: top right */
@media (min-width: 576px) {
    .premium-toast-container {
        top: calc(var(--rs-navbar-height-desktop) + 16px);
        right: 20px;
        bottom: auto;
        left: auto;
    }

    .premium-toast {
        min-width: 300px;
        max-width: 400px;
    }
}

/* Mobile: bottom, full width */
@media (max-width: 575.98px) {
    .premium-toast-container {
        bottom: calc(var(--rs-bottom-nav-height) + 16px + env(safe-area-inset-bottom));
        left: 16px;
        right: 16px;
        top: auto;
    }

    .premium-toast {
        min-width: unset;
        max-width: 100%;
        width: 100%;
    }
}

/* ==========================================================================
   27. FLOATING ACTION BUTTON (FAB) — MOBILE
   ========================================================================== */

.fab {
    position: fixed;
    bottom: calc(var(--rs-bottom-nav-height) + 20px + env(safe-area-inset-bottom));
    right: 20px;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    box-shadow: 0 6px 20px rgba(0,0,0,0.2);
    z-index: 100;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.fab:hover, .fab:focus {
    transform: scale(1.1);
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

/* ==========================================================================
   28. LANDSCAPE MOBILE ADJUSTMENTS
   ========================================================================== */

@media (max-width: 767.98px) and (orientation: landscape) {
    .hero-section {
        min-height: auto;
        padding: 32px var(--rs-gutter-mobile);
    }

    .auth-right.form-side {
        min-height: auto;
        padding: 20px;
    }

    .login-box {
        padding: 20px;
    }

    /* Bottom nav takes less space in landscape */
    body.has-bottom-nav .main-content {
        padding-bottom: calc(60px + env(safe-area-inset-bottom));
    }
}

/* ==========================================================================
   29. DARK MODE SUPPORT
   ========================================================================== */

body.dark-mode {
    --rs-bg-main: #0f172a;
    --rs-bg-card: #1e293b;
    --rs-text-main: #f1f5f9;
    --rs-text-muted: #94a3b8;
    --rs-border: rgba(255,255,255,0.08);
}

body.dark-mode .glass-stat-card,
body.dark-mode .glassmorphism-card,
body.dark-mode .navigator-card {
    background: rgba(30, 41, 59, 0.8) !important;
    border-color: rgba(255,255,255,0.06) !important;
    color: #f1f5f9;
}

body.dark-mode nav.navbar,
body.dark-mode .top-navbar {
    background: rgba(15, 23, 42, 0.95) !important;
    border-color: rgba(255,255,255,0.06) !important;
}

body.dark-mode .dropdown-menu {
    background: rgba(30, 41, 59, 0.98) !important;
    border-color: rgba(255,255,255,0.08) !important;
}

body.dark-mode .dropdown-item {
    color: #cbd5e1 !important;
}

body.dark-mode .dropdown-item:hover {
    background: rgba(255,255,255,0.05) !important;
    color: #f1f5f9 !important;
}

body.dark-mode .form-control,
body.dark-mode .form-select,
body.dark-mode .premium-input {
    background: rgba(30, 41, 59, 0.8) !important;
    border-color: rgba(255,255,255,0.1) !important;
    color: #f1f5f9 !important;
}

body.dark-mode .custom-mobile-nav-inner {
    background: rgba(15, 23, 42, 0.95) !important;
    border-color: rgba(16, 185, 129, 0.2) !important;
}

body.dark-mode .bottom-nav-btn {
    color: #94a3b8 !important;
}

/* ==========================================================================
   30. HIGH CONTRAST MODE SUPPORT
   ========================================================================== */

@media (prefers-contrast: high) {
    :focus-visible {
        outline: 4px solid #000;
        outline-offset: 2px;
    }

    .btn, button {
        border: 2px solid currentColor;
    }
}