/* ============================================================
   responsive-scale.css  –  Unified Mobile & Touch System
   Board Book · v2 · 2026-04-17

   Philosophy: "Same interface, proportionally smaller"
   - JS in index.html applies CSS `zoom` to body for screens
     600-1439px so the ENTIRE UI scales down proportionally
   - CSS breakpoints below handle phone (<600px) responsive layouts
   - Enable native touch scrolling everywhere it's appropriate
   - Disable touch-action: none ONLY on the drawing canvas
   - Meet Apple/Google 44-48 px minimum touch-target guidelines
   ============================================================ */

/* ============================================================
   0-A. ZOOM SUPPORT — prevent horizontal overflow when body
        is set to DESIGN_W by the JS proportional-zoom script
   ============================================================ */
html {
    /* Clip to viewport so zoomed body doesn't cause page scroll */
    overflow: hidden;
}

/* When JS sets body.width = DESIGN_W and body.zoom = scale,
   the html element clips any overflow so no horizontal scroll  */
body {
    /* overflow-x must be hidden at body level too               */
    overflow-x: hidden;
}


/* ============================================================
   0-B. ZOOM VIEWPORT FIX — Universal override for vw/vh units
        when CSS zoom is active.

        Problem: CSS zoom makes vw/vh reference the ACTUAL
        viewport, not the zoomed body dimensions. Elements using
        100vw/100vh end up smaller than the zoomed body.

        Solution: Override ALL position:fixed full-screen elements
        to use 100% (which references the zoomed body) instead.
        Side panels with fixed widths only get height override.
   ============================================================ */

/* Universal: ANY element inside body.app-zoomed that has          *
 * position:fixed and 100vw/100vh in its inline style gets fixed. *
 * This catches JS-dynamically-created overlays automatically.    */
body.app-zoomed [style*="position: fixed"][style*="100vw"],
body.app-zoomed [style*="position: fixed"][style*="100vh"],
body.app-zoomed [style*="position:fixed"][style*="100vw"],
body.app-zoomed [style*="position:fixed"][style*="100vh"],

/* CSS-defined full-screen overlays (no inline style to match)    */
body.app-zoomed .student-dashboard,
body.app-zoomed .frozen-overlay,
body.app-zoomed .auth-modal-overlay,
body.app-zoomed #landing-page,
body.app-zoomed #app-loader,
body.app-zoomed .custom-modal-overlay,
body.app-zoomed #lessonCreateModal,
body.app-zoomed #worksheetModal,
body.app-zoomed #lessonPlanModal,
body.app-zoomed #wsPreviewOverlay,
body.app-zoomed #lpPreviewOverlay,
body.app-zoomed #wsSketchOverlay,
body.app-zoomed #lessonSlidesModal,
body.app-zoomed #lessonOpenModeModal,
body.app-zoomed .student-entry-overlay,
body.app-zoomed #snipping-overlay,
body.app-zoomed .theater-curtain-overlay,
body.app-zoomed .ai-sidebar-container,
body.app-zoomed .search-sidebar-container,
body.app-zoomed .quran-sidebar-container,
body.app-zoomed .activity-game-overlay,
body.app-zoomed .store-overlay,
body.app-zoomed .store-publish-overlay,
body.app-zoomed .store-detail-overlay,
body.app-zoomed .scp-lightbox {
    width: 100% !important;
    height: 100% !important;
}

/* Side panels — only height needs fixing.
   These have their own fixed widths (380px, 280px, 820px etc.)
   and must NOT be stretched to 100% width.                     */
body.app-zoomed .chat-slider,
body.app-zoomed .lesson-drawer,
body.app-zoomed #onenote-nav {
    height: 100% !important;
}



/* ============================================================
   0. CSS CUSTOM PROPERTIES – RESPONSIVE TOKENS
   ============================================================ */
:root {
    /* Scale tokens written against a 1440-wide design baseline.
       JS can also update --vp-scale at runtime if needed.       */
    --vp-scale: 1;

    /* Touch target floors */
    --touch-min: 44px;
    --touch-ideal: 48px;

    /* Safe-area insets (iPhone notch / Dynamic Island) */
    --safe-top:    env(safe-area-inset-top,    0px);
    --safe-bottom: env(safe-area-inset-bottom, 0px);
    --safe-left:   env(safe-area-inset-left,   0px);
    --safe-right:  env(safe-area-inset-right,  0px);
}


/* ============================================================
   1. HTML / BODY – UNIVERSAL TOUCH & SCROLL FOUNDATION
   ============================================================ */

html {
    /* Allow the landing page (fixed-positioned child) to scroll
       while the app remains clipped.                            */
    position: relative;
    overflow: hidden;
    overscroll-behavior: none;
    /* Respect device pixel density for sharp rendering          */
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

body {
    /* pan-y pinch-zoom: vertical drag + pinch pass through to
       scrollable children; canvas blocks its own touch events   */
    touch-action: pan-y pinch-zoom;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: none;
}

/* Drawing canvas: needs ALL pointer/touch events exclusively */
.canvas-layer,
canvas.upper-canvas,
canvas.lower-canvas {
    touch-action: none !important;
    -webkit-tap-highlight-color: transparent;
}


/* ============================================================
   2. GLOBAL TOUCH QUALITY-OF-LIFE
   ============================================================ */

/* Suppress the 300ms tap delay on everything interactive        */
a,
button,
[role="button"],
input,
label,
select,
textarea,
.tool-btn,
.nav-btn,
.nav-item,
.role-selector,
.landing-btn,
.ui-control-btn,
.side-tab,
.nav-tab,
.nav-book-item,
.icon-btn,
.action-btn,
.bulk-btn,
.modal-btn,
.auth-submit,
.auth-tab,
.orientation-card,
.iw-reaction,
.ss-tool-btn,
.ss-hint-btn,
.iw-fab,
.role-card,
.close-panel,
.close-btn-modern,
.bookshelf-toggle,
.nav-close-btn,
.ai-action-chip,
.ai-action-btn,
.ai-expand-toggle,
.ai-side-close-btn,
.new-chat-btn,
.close-ai-btn {
    touch-action: manipulation;          /* no 300ms delay        */
    -webkit-tap-highlight-color: transparent;
}

/* Prevent accidental text selection while tapping UI            */
.side-system,
.nav-system,
.pinned-bottom-bar,
.top-ui-layer,
.fixed-ui-controls,
.fixed-ui-controls-left,
.nav-bulk-bar {
    -webkit-user-select: none;
    user-select: none;
}

/* Allow input fields to select text */
input, textarea {
    -webkit-user-select: text !important;
    user-select: text !important;
}


/* ============================================================
   3. SCROLLABLE REGIONS – MOMENTUM + TOUCH
   ============================================================ */

/* Landing page (the whole page-level scroll)                    */
#landing-page {
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior-y: contain;
    touch-action: pan-y pinch-zoom;
}

/* OneNote navigation panel                                      */
#onenote-nav {
    touch-action: pan-y pan-x;
    -webkit-overflow-scrolling: touch;
}

.col-list,
.nav-book-list {
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
    touch-action: pan-y;
}

.nav-column.bookshelf.expanded {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    touch-action: pan-x pan-y;
}

/* Modals & overlays                                             */
.custom-modal-overlay,
.auth-modal-overlay,
.student-entry-overlay {
    -webkit-overflow-scrolling: touch;
    touch-action: pan-y;
}

.auth-modal,
.student-panel-content,
.premium-modal-box {
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    touch-action: pan-y;
    max-height: 90dvh;
}

/* Tool panels, notification lists, student grids               */
.tools-scroll,
.student-grid,
.notif-list,
.share-suggestions,
.slide-thumbnails-list {
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    touch-action: pan-y;
    overscroll-behavior: contain;
}

/* Horizontal-scroll UI control bars                            */
.fixed-ui-controls,
.fixed-ui-controls-left {
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    touch-action: pan-x;
    overscroll-behavior-x: contain;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.fixed-ui-controls::-webkit-scrollbar,
.fixed-ui-controls-left::-webkit-scrollbar {
    display: none;
}


/* ============================================================
   4. FLUID TYPOGRAPHY – clamp() across all breakpoints
   ============================================================ */

:root {
    --fs-xs:   clamp(0.65rem,  1.2vw, 0.75rem);
    --fs-sm:   clamp(0.75rem,  1.5vw, 0.85rem);
    --fs-base: clamp(0.875rem, 1.8vw, 1rem);
    --fs-md:   clamp(1rem,     2vw,   1.2rem);
    --fs-lg:   clamp(1.2rem,   2.5vw, 1.6rem);
    --fs-xl:   clamp(1.5rem,   3.5vw, 2.2rem);
    --fs-2xl:  clamp(2rem,     5vw,   3.5rem);
    --fs-3xl:  clamp(2.5rem,   7vw,   4.8rem);
}

/* Apply fluid base font to html so rem follows along           */
html {
    font-size: clamp(14px, 1.2vw, 16px);
}


/* ============================================================
   5. TOUCH MINIMUM SIZES – enforce 44px everywhere interactive
   ============================================================ */

@media (pointer: coarse) {

    button,
    .tool-btn,
    .nav-btn,
    .nav-item,
    .role-selector,
    .landing-btn,
    .auth-submit,
    .modal-btn,
    .bulk-btn,
    .iw-sort-btn,
    .ss-tool-btn {
        min-height: var(--touch-min);
    }

    .ui-control-btn,
    .side-tab,
    .nav-tab,
    .nav-book-item,
    .icon-btn,
    .close-panel,
    .close-btn-modern,
    .nav-close-btn,
    .bookshelf-toggle {
        min-width:  var(--touch-min);
        min-height: var(--touch-min);
    }

    /* Pinch-friendly radio/checkbox hit areas                    */
    input[type="radio"],
    input[type="checkbox"] {
        min-width:  24px;
        min-height: 24px;
    }

    /* Better modal buttons on touch devices                      */
    .modal-btn {
        padding: 16px;
    }

    /* Auth submit                                                */
    .auth-submit {
        padding: 18px;
    }
}


/* ============================================================
   6.  LANDING PAGE  –  < 1024 px
   ============================================================ */

@media (max-width: 1024px) {

    .landing-hero-container {
        padding: clamp(40px, 8vw, 100px) 0;
    }

    .hero-split {
        grid-template-columns: 1fr;
        text-align: center;
        gap: clamp(32px, 6vw, 60px);
    }

    .hero-text {
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    .hero-role-actions {
        flex-direction: column;
        width: 100%;
        max-width: 420px;
        margin: 0 auto;
    }

    .role-selector {
        width: 100%;
    }

    .header-nav {
        display: none;
    }
}

@media (max-width: 640px) {

    .landing-header {
        height: 64px;
    }

    .header-logo {
        font-size: 1.3rem;
    }

    .hero-title {
        font-size: clamp(2rem, 10vw, 3rem);
        margin-bottom: 16px;
    }

    .hero-description {
        font-size: clamp(0.95rem, 3.5vw, 1.2rem);
        margin-bottom: 24px;
    }

    .role-selector {
        padding: 14px 18px;
        gap: 14px;
        border-radius: 20px;
    }

    .role-icon {
        width: 44px;
        height: 44px;
        font-size: 1.1rem;
    }

    .role-info strong {
        font-size: 1rem;
    }

    .role-info span {
        font-size: 0.8rem;
    }

    /* Student join panel                                         */
    .student-panel-content {
        padding: 28px 20px;
        border-radius: 24px;
        width: 96%;
    }

    .student-panel-content h3 {
        font-size: 1.5rem;
    }

    /* Landing Buttons                                            */
    .landing-btn {
        padding: 12px 22px;
        font-size: 0.95rem;
        border-radius: 14px;
    }

    .landing-btn.full {
        padding: 16px;
        font-size: 1rem;
    }
}


/* ============================================================
   7.  AUTH MODAL  –  mobile
   ============================================================ */

@media (max-width: 480px) {

    .auth-modal {
        width: 92%;
        padding: 28px 20px;
        border-radius: 24px;
        max-height: 92dvh;
        overflow-y: auto;
    }

    .auth-header h2 {
        font-size: 1.7rem;
    }

    .auth-close {
        top: 14px;
        right: 14px;
        width: 34px;
        height: 34px;
    }

    .role-selection-cards {
        grid-template-columns: 1fr 1fr;
        gap: 10px;
    }

    .role-card {
        padding: 14px 10px;
        gap: 8px;
    }

    .role-card i {
        font-size: 1.5rem;
    }

    .role-card span {
        font-size: 0.85rem;
    }
}


/* ============================================================
   8.  TOP UI LAYER  –  tablet + mobile
   ============================================================ */

@media (max-width: 1024px) {

    .top-ui-layer {
        top: 12px;
        left: 12px;
        right: 12px;
        gap: 8px;
    }

    .ui-control-btn {
        width: 40px;
        height: 40px;
        font-size: 0.9rem;
    }

    .zen-btn {
        width: 32px;
        height: 32px;
        font-size: 0.8rem;
    }

    .zen-controls {
        gap: 4px;
        margin-right: 6px;
    }
}

@media (max-width: 640px) {

    .top-ui-layer {
        top: 8px;
        left: 8px;
        right: 8px;
        gap: 4px;
    }

    .ui-control-btn {
        width: 36px;
        height: 36px;
        font-size: 0.85rem;
        border-radius: 12px;
    }

    /* Allow left bar to scroll horizontally if buttons overflow  */
    .fixed-ui-controls-left {
        max-width: 48%;
    }

    .fixed-ui-controls {
        max-width: 50%;
    }

    /* Zen controls compact on very small screens                 */
    .zen-controls {
        gap: 2px;
        margin-right: 4px;
    }

    .zen-btn {
        width: 28px;
        height: 28px;
        font-size: 0.75rem;
        border-radius: 8px;
    }
}

/* Disable hover lift on touch devices (no hover in touch)       */
@media (hover: none) {

    .ui-control-btn:hover {
        transform: none;
    }

    .role-selector:hover {
        transform: none;
    }
}

/* Active press feedback for touch                                */
.ui-control-btn:active {
    transform: scale(0.91) !important;
    opacity: 0.85;
}


/* ============================================================
   9.  ONENOTE NAVIGATION PANEL  –  tablet + mobile
   ============================================================ */

@media (max-width: 900px) {

    /* Navigation takes full width on tablet/mobile               */
    #onenote-nav {
        width: 100% !important;
        border-right: none;
        height: 100dvh;
        padding-top: var(--safe-top);
        padding-bottom: var(--safe-bottom);
    }

    #onenote-nav.bookshelf-expanded {
        width: 100% !important;
    }

    /* Col 1 – Bookshelf                                          */
    .nav-column.bookshelf {
        width: 64px;
        padding: 16px 0;
    }

    .nav-book-item {
        width: 44px;
        height: 44px;
        border-radius: 10px;
        font-size: 0.9rem;
    }

    .nav-book-item span:first-child {
        width: 44px;
        height: 44px;
    }

    .teacher-profile-mini {
        width: 48px;
        height: 48px;
        margin-bottom: 16px;
    }

    .teacher-profile-mini .avatar-circle {
        width: 38px;
        height: 38px;
        font-size: 1rem;
    }

    /* Expanded bookshelf acts as a sheet overlay on mobile       */
    .nav-column.bookshelf.expanded {
        position: absolute;
        top: 0;
        left: 0;
        width: 82% !important;
        max-width: 300px;
        height: 100%;
        z-index: 50;
        background: var(--bg-surface-solid);
        box-shadow: 12px 0 50px rgba(0, 0, 0, 0.5);
        border-right: 1px solid var(--border-glass);
    }

    /* Col 2 – Chapters                                           */
    .nav-column.chapters {
        width: 140px;
    }

    .col-header {
        padding: 16px 10px 8px;
        flex-wrap: wrap;
        gap: 6px;
    }

    .col-header h3 {
        font-size: 0.65rem;
    }

    .col-subtitle {
        padding: 0 10px 6px;
        font-size: 0.65rem;
    }

    .col-list {
        padding: 6px 6px 100px;
    }

    /* Nav items compact                                          */
    .nav-item {
        padding: 10px 8px;
        border-radius: 10px;
        margin-bottom: 4px;
        font-size: 0.85rem;
        gap: 10px;
    }

    /* Bulk bar wraps on small screens                            */
    .nav-bulk-bar {
        width: 92%;
        padding: 10px 14px;
        bottom: calc(16px + var(--safe-bottom));
        flex-wrap: wrap;
        justify-content: center;
        gap: 10px;
    }

    .bulk-info {
        font-size: 0.8rem;
        padding: 6px 12px;
        width: 100%;
        justify-content: center;
    }

    .bulk-btn {
        height: 36px;
        font-size: 0.8rem;
        padding: 0 10px;
        flex: 1;
        justify-content: center;
        min-width: 0;
    }

    .bulk-close {
        width: 28px;
        height: 28px;
    }
}

@media (max-width: 480px) {

    .nav-column.chapters {
        width: 120px;
    }

    .nav-column.bookshelf {
        width: 56px;
        padding: 12px 0;
    }

    .nav-book-item {
        width: 40px;
        height: 40px;
    }
}


/* ============================================================
   10. LEFT TOOLBAR (side-system) & RIGHT NAV (nav-system)
       ─ Already handled in navigation.css; here we add missing
         safe-area and touch polish.
   ============================================================ */

@media (max-width: 768px) {

    .side-system {
        bottom: calc(12px + var(--safe-bottom));
        left: calc(12px + var(--safe-left));
    }

    .nav-system {
        bottom: calc(12px + var(--safe-bottom));
        right: calc(12px + var(--safe-right));
    }

    /* Bigger tap zones on side tabs                              */
    .side-tab {
        width: 36px;
        height: 48px;
        font-size: 1rem;
    }

    .nav-tab {
        width: 32px;
        height: 44px;
    }

    /* Tool buttons larger hit area                               */
    .tool-btn {
        width: 40px;
        height: 40px;
        font-size: 1.05rem;
    }

    /* Active state — ring + taller tab                           */
    .tool-btn.active {
        box-shadow: inset 0 0 0 2px var(--primary, #6366f1) !important;
    }
    .side-tab.active {
        height: 52px;
        margin: -2px 0;
        box-shadow: inset 0 0 0 2px var(--primary, #6366f1) !important;
    }
    .nav-tab.active {
        height: 50px;
        margin: -2px 0;
        box-shadow: inset 0 0 0 2px var(--primary, #6366f1) !important;
    }

    /* Tactile press feedback                                     */
    .tool-btn:active,
    .side-tab:active,
    .nav-tab:active {
        transform: scale(0.91) !important;
        opacity: 0.8;
    }
}

@media (max-width: 480px) {

    .side-system {
        bottom: calc(10px + var(--safe-bottom));
        left: calc(8px + var(--safe-left));
    }

    .nav-system {
        bottom: calc(10px + var(--safe-bottom));
        right: calc(8px + var(--safe-right));
    }
}


/* ============================================================
   11. PINNED BOTTOM BAR  –  float above safe-area chin
   ============================================================ */

.pinned-bottom-bar {
    bottom: calc(16px + var(--safe-bottom));
    left: 50%;
    transform: translateX(-50%);
}

@media (max-width: 768px) {

    .pinned-bottom-bar {
        padding: 8px 14px !important;
        margin-bottom: 0 !important;
        gap: 10px !important;
        width: auto !important;
        max-width: 92vw;
        bottom: calc(20px + var(--safe-bottom));
        left: 50% !important;
        transform: translateX(-50%) !important;
        border-radius: 20px !important;
    }

    /* Compact pen-size dots                                      */
    .pen-size-dot {
        width: 10px;
        height: 10px;
    }
}


/* ============================================================
   12. PREMIUM MODALS  –  full mobile adaptation
   ============================================================ */

@media (max-width: 640px) {

    .premium-modal-box {
        width: 94%;
        padding: 20px 18px !important;
        border-radius: 20px !important;
        max-height: 88dvh;
        overflow-y: auto;
    }

    .modal-header-modern {
        padding: 0 0 16px 0 !important;
        margin-bottom: 16px !important;
    }

    .modal-title-text {
        font-size: 1.25rem !important;
    }

    .orientation-selector {
        flex-direction: column;
        gap: 8px;
    }

    .orientation-card {
        padding: 12px;
    }

    .input-modern {
        padding: 13px !important;
        font-size: 16px !important; /* prevents iOS zoom */
    }

    .btn-create-modern {
        padding: 14px !important;
        font-size: 0.95rem !important;
    }
}

@media (max-width: 480px) {

    /* Lesson open-mode modal stacks buttons vertically           */
    #lessonOpenModeModal .premium-modal-box > div > div[style*="flex"] {
        flex-direction: column !important;
    }
}


/* ============================================================
   13. NOTIFICATIONS PANEL  –  mobile
   ============================================================ */

@media (max-width: 640px) {

    .notification-panel-premium {
        width: 94vw !important;
        max-height: 80dvh;
        border-radius: 20px !important;
    }

    .notif-list {
        max-height: 55dvh;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        touch-action: pan-y;
    }
}


/* ============================================================
   14. ACTIVITY-STORE  –  mobile
   ============================================================ */

@media (max-width: 768px) {

    .store-overlay {
        padding: 0 !important;
    }

    .store-panel {
        width: 100% !important;
        height: 100dvh !important;
        max-width: 100% !important;
        border-radius: 0 !important;
    }

    .store-header {
        padding: 14px 16px !important;
        flex-wrap: wrap;
        gap: 8px;
    }

    .store-filters {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        touch-action: pan-x;
        flex-wrap: nowrap;
        padding-bottom: 4px;
    }

    .store-grid {
        grid-template-columns: 1fr 1fr !important;
        gap: 10px !important;
        padding: 12px !important;
    }

    .store-card {
        border-radius: 14px !important;
    }
}

@media (max-width: 480px) {

    .store-grid {
        grid-template-columns: 1fr !important;
    }
}


/* ============================================================
   15. STUDENT DASHBOARD PANEL – mobile
   ============================================================ */

@media (max-width: 768px) {

    .student-dashboard {
        width: 100vw !important;
        height: 100dvh !important;
        top: 0 !important;
        left: 0 !important;
        border-radius: 0 !important;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }

    .dashboard-header {
        flex-wrap: wrap;
        gap: 8px;
        padding: 12px 14px !important;
    }

    .header-actions {
        flex-wrap: wrap;
        gap: 6px;
    }

    .dash-btn {
        font-size: 0.8rem !important;
        padding: 8px 12px !important;
    }

    .student-grid {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)) !important;
        gap: 10px !important;
        padding: 12px !important;
    }
}


/* ============================================================
   16. AI SIDEBAR  –  mobile
   ============================================================ */

@media (max-width: 768px) {

    .ai-sidebar-container,
    .ai-sidebar {
        width: min(96vw, 360px) !important;
    }
}

@media (max-width: 480px) {

    .ai-sidebar-container,
    .ai-sidebar {
        width: 96vw !important;
        border-radius: 20px 20px 0 0 !important;
        bottom: 0 !important;
        top: auto !important;
        height: 70dvh !important;
    }
}


/* ============================================================
   17. SEARCH SIDEBAR  –  mobile
   ============================================================ */

@media (max-width: 768px) {

    .search-sidebar {
        width: min(96vw, 380px) !important;
    }
}


/* ============================================================
   18. PRESENCE NOTCH  –  safe screen
   ============================================================ */

.presence-notch {
    /* Add safe-area insets ON TOP of the expanded base padding */
    padding-top: calc(10px + var(--safe-top));
    padding-bottom: 10px;
    padding-left: calc(24px + var(--safe-left));
    padding-right: calc(24px + var(--safe-right));
}

@media (max-width: 640px) {

    .presence-notch {
        font-size: 0.8rem;
        /* Keep expanded width — only reduce font, not the padding */
        padding: calc(10px + var(--safe-top)) 24px 10px;
    }

    #digital-clock {
        font-size: 0.8rem;
    }

    #btn-live-session {
        font-size: 0.7rem !important;
        padding: 3px 8px !important;
    }
}


/* ============================================================
   19. AURA-JOIN.HTML GAME SCREENS  –  mobile first
   ============================================================ */

@media (max-width: 640px) {

    /* SketchSolve student panel – stack canvas + AI vertically   */
    .ss-stu-container {
        flex-direction: column !important;
    }

    .ss-ai-panel {
        width: 100% !important;
        min-width: 100% !important;
        max-height: 42dvh;
        border-left: none !important;
        border-top: 1px solid rgba(255, 255, 255, 0.08) !important;
        overflow: hidden;
    }

    .ss-toolbar {
        padding: 8px 10px;
        gap: 6px;
    }

    .ss-tool-btn {
        width: 38px;
        height: 38px;
    }

    .ss-question-bar {
        padding: 12px 14px;
    }

    /* Jigsaw HUD compact                                         */
    .jigsaw-hud {
        padding: 10px 14px;
        font-size: 0.85rem;
    }

    /* InsightWall note grid smaller columns                      */
    .iw-wall {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)) !important;
        padding: 16px 12px 80px !important;
    }

    /* InsightWall FAB safe-area                                  */
    .iw-fab {
        bottom: calc(20px + var(--safe-bottom));
        right: calc(20px + var(--safe-right));
        width: 56px;
        height: 56px;
        font-size: 1.3rem;
    }

    /* AuraQuest option buttons                                   */
    .option-btn {
        padding: 16px 18px;
        font-size: clamp(0.9rem, 3.5vw, 1.2rem);
        gap: 10px;
    }

    .opt-letter {
        font-size: 1rem;
        width: 24px;
    }

    /* Game header compact                                        */
    .game-header {
        padding: 10px 16px;
        font-size: 0.9rem;
    }

    /* Join card compact                                          */
    .join-card {
        padding: 28px 20px !important;
        border-radius: 24px !important;
        max-width: 100%;
    }
}


/* ============================================================
   20. LANDSCAPE MODE  –  short Phones
   ============================================================ */

@media (max-width: 900px) and (orientation: landscape) {

    #landing-page .landing-header {
        height: 54px;
    }

    .landing-hero-container {
        padding: 20px 0;
    }

    .hero-split {
        gap: 24px;
    }

    /* Navigation collapses its column widths further             */
    #onenote-nav {
        width: 100% !important;
    }

    .nav-column.chapters {
        width: 120px;
    }

    /* Side/Nav toolbars anchor to mid-height in landscape        */
    .side-system,
    .nav-system {
        bottom: auto;
        top: 50%;
        transform: translateY(-50%);
    }

    /* AI sidebar in sheet mode in landscape                      */
    .ai-sidebar-container {
        height: 80dvh !important;
    }

    /* Game content padding in landscape                          */
    .game-content {
        padding: 20px 16px 60px !important;
    }
}


/* ============================================================
   21. GLASSMORPHISM BARS – touch-optimised on small screens
   ============================================================ */

@media (max-width: 768px) {

    .side-system .side-panel,
    .nav-system .nav-panel,
    .pinned-bottom-bar {
        background: rgba(255, 255, 255, 0.88) !important;
        backdrop-filter: blur(24px) saturate(180%) !important;
        -webkit-backdrop-filter: blur(24px) saturate(180%) !important;
        border: 1px solid rgba(255, 255, 255, 0.4) !important;
        box-shadow: 0 8px 32px rgba(31, 38, 135, 0.1) !important;
    }

    [data-theme="dark"] .side-system .side-panel,
    [data-theme="dark"] .nav-system .nav-panel,
    [data-theme="dark"] .pinned-bottom-bar {
        background: rgba(15, 23, 42, 0.88) !important;
        border: 1px solid rgba(255, 255, 255, 0.1) !important;
        box-shadow: 0 8px 32px rgba(0, 0, 0, 0.45) !important;
    }
}


/* ============================================================
   22. ACTIVITY STORE MODALS (publish, preview) – mobile
   ============================================================ */

@media (max-width: 640px) {

    /* Any dialog that uses the generic .modal-actions row         */
    .modal-actions {
        flex-direction: column;
        gap: 8px;
    }

    .modal-actions .modal-btn {
        flex: none;
        width: 100%;
    }
}


/* ============================================================
   23. ACCESSIBILITY
   ============================================================ */

/* Respect "prefers-reduced-motion" – collapse all animations    */
@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;
    }
}

/* High-contrast overrides                                        */
@media (prefers-contrast: high) {
    :root {
        --border-glass: rgba(255, 255, 255, 0.35);
        --border-strong: rgba(255, 255, 255, 0.55);
    }
}

/* Focus rings for keyboard navigation (coarser outline on touch)*/
:focus-visible {
    outline: 2px solid var(--primary, #6366f1);
    outline-offset: 2px;
    border-radius: 4px;
}

/* Suppress focus ring entirely on touch (pointer: coarse)       */
@media (pointer: coarse) {
    :focus-visible {
        outline: none;
    }
}


/* ============================================================
   24. UTILITY CLASSES
   ============================================================ */

/* Force enable scrolling */
.scroll-enabled {
    overflow-y: auto !important;
    -webkit-overflow-scrolling: touch !important;
    touch-action: pan-y !important;
}

/* Force enable touch manipulation */
.touch-enabled {
    touch-action: manipulation !important;
    -webkit-tap-highlight-color: transparent !important;
}

/* Disable all scrolling (painting canvas container, etc.) */
.scroll-disabled {
    overflow: hidden !important;
    touch-action: none !important;
}

/* Horizontal scroll helper (filter bars, etc.) */
.scroll-x {
    overflow-x: auto !important;
    overflow-y: hidden !important;
    -webkit-overflow-scrolling: touch !important;
    touch-action: pan-x !important;
    scrollbar-width: none;
}

.scroll-x::-webkit-scrollbar {
    display: none;
}


/* ============================================================
   26. PORTRAIT PHONE  (< 430 px wide, portrait)
       These screens skip zoom → need manual responsive layout
   ============================================================ */

/* ── Portrait phone — general fixes ──────────────────────── */
@media (max-width: 429px) and (orientation: portrait) {

    /* Landing page flows naturally */
    #landing-page {
        overflow-y: auto !important;
    }

    .landing-hero-container {
        padding: 28px 0 40px !important;
        justify-content: flex-start;
    }

    .hero-split {
        gap: 28px !important;
    }

    .hero-title {
        font-size: clamp(1.8rem, 9vw, 2.6rem) !important;
        margin-bottom: 12px !important;
    }

    .hero-description {
        font-size: clamp(0.88rem, 4vw, 1.05rem) !important;
        margin-bottom: 20px !important;
    }

    .role-selector {
        padding: 12px 16px !important;
        gap: 12px !important;
        border-radius: 18px !important;
    }

    .role-icon {
        width: 40px !important;
        height: 40px !important;
        font-size: 1rem !important;
    }

    .role-info strong { font-size: 0.95rem !important; }
    .role-info span   { font-size: 0.78rem !important; }

    /* Student join panel */
    .student-panel-content {
        padding: 24px 16px !important;
        border-radius: 20px !important;
        width: 97% !important;
    }

    /* Auth modal */
    .auth-modal {
        padding: 24px 16px !important;
        border-radius: 20px !important;
        width: 96% !important;
    }

    /* Top controls really tight */
    .top-ui-layer {
        top: 6px !important;
        left: 6px !important;
        right: 6px !important;
    }

    .ui-control-btn {
        width: 34px !important;
        height: 34px !important;
        font-size: 0.8rem !important;
    }

    /* Zen controls hidden on portrait phone (use bottom bar) */
    #zen-mode-controls {
        display: none !important;
    }

    /* Side toolbar + nav: portrait phone – float at bottom corners */
    .side-system {
        bottom: calc(8px + var(--safe-bottom)) !important;
        left: calc(8px + var(--safe-left)) !important;
        top: auto !important;
        transform: none !important;
    }

    .nav-system {
        bottom: calc(8px + var(--safe-bottom)) !important;
        right: calc(8px + var(--safe-right)) !important;
        top: auto !important;
        transform: none !important;
    }

    .side-panel  { max-height: 48dvh !important; }
    .nav-panel   { max-height: 48dvh !important; }

    /* Pinned bottom bar centred & smaller */
    .pinned-bottom-bar {
        left: 50% !important;
        transform: translateX(-50%) !important;
        bottom: calc(14px + var(--safe-bottom)) !important;
        padding: 6px 10px !important;
        gap: 8px !important;
        max-width: 88vw !important;
    }

    /* OneNote nav takes full height */
    #onenote-nav {
        width: 100% !important;
        height: 100dvh !important;
    }

    /* Modals */
    .premium-modal-box {
        width: 97% !important;
        padding: 16px 14px !important;
        border-radius: 18px !important;
    }

    /* Store grid: 1 column */
    .store-grid {
        grid-template-columns: 1fr !important;
    }

    /* Student grid cards */
    .student-grid {
        grid-template-columns: 1fr 1fr !important;
    }
}


/* ── Portrait phone — "Rotate for best experience" hint ───── */
/* Shows a gentle banner when teacher opens the canvas in portrait
   phone mode. Can be dismissed. Students never see it.         */
@media (max-width: 429px) and (orientation: portrait) {

    /* Injected by CSS, no JS needed */
    body.is-teacher .zen-workspace::before {
        content: "↺  Rotate for the best teaching experience";
        position: fixed;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
        background: rgba(15, 23, 42, 0.92);
        color: #94a3b8;
        font-size: 0.8rem;
        font-weight: 600;
        padding: 10px 18px;
        border-radius: 20px;
        border: 1px solid rgba(255, 255, 255, 0.1);
        white-space: nowrap;
        z-index: 5;
        pointer-events: none;
        letter-spacing: 0.02em;
        backdrop-filter: blur(8px);
        opacity: 0.85;
    }
}


/* ============================================================
   27. SMALL TABLET PORTRAIT (430–899 px wide, portrait)
       JS applies zoom from 900px baseline.
       These styles apply when zoom is NOT engaged (> 900px).
   ============================================================ */

@media (min-width: 430px) and (max-width: 899px) and (orientation: portrait) {

    /* When zoom IS engaged, body has class app-zoomed.
       When not, apply fallback responsive styles.              */
    body:not(.app-zoomed) #onenote-nav {
        width: 100% !important;
    }

    body:not(.app-zoomed) .nav-column.chapters {
        width: 160px !important;
    }

    body:not(.app-zoomed) .nav-bulk-bar {
        width: 92% !important;
        flex-wrap: wrap !important;
    }

    /* Ensure pinned bar doesn't overflow */
    body:not(.app-zoomed) .pinned-bottom-bar {
        max-width: 90vw !important;
    }
}


/* ============================================================
   28. LANDSCAPE PHONE (< 600 px wide, landscape)
       JS skips zoom → responsive CSS handles it.
   ============================================================ */

@media (max-width: 599px) and (orientation: landscape) {

    /* Very short – collapse landing to minimal height */
    .landing-header {
        height: 50px !important;
    }

    .landing-hero-container {
        padding: 12px 0 !important;
    }

    .hero-split {
        gap: 16px !important;
    }

    .hero-title {
        font-size: clamp(1.4rem, 6vw, 2rem) !important;
        margin-bottom: 8px !important;
    }

    .hero-description {
        font-size: 0.85rem !important;
        margin-bottom: 14px !important;
    }

    /* Role selectors side-by-side in landscape phone */
    .hero-role-actions {
        flex-direction: row !important;
        flex-wrap: wrap;
        gap: 10px !important;
    }

    .role-selector {
        flex: 1;
        min-width: 140px;
        padding: 10px 14px !important;
    }

    /* Toolbars: anchor mid-height (more natural in landscape) */
    .side-system,
    .nav-system {
        top: 50% !important;
        bottom: auto !important;
        transform: translateY(-50%) !important;
    }

    /* Bottom bar: ensure it clears keyboard */
    .pinned-bottom-bar {
        bottom: calc(10px + var(--safe-bottom)) !important;
    }

    /* Side panel shorter in landscape phone */
    .side-panel,
    .nav-panel {
        max-height: 70vh !important;
    }
}


/* ============================================================
   29. TOP BAR — stop overlap + shrink in portrait / small screens
       Bottom bar — scrollable horizontal strip
   ============================================================ */

/* ── Top bar: shared shrink logic ──────────────────────────── */
/*
   The top bar has two sides:
     LEFT:  #main-ui-controls-left  (AI, search, students, store…)
     RIGHT: #main-ui-controls       (raise hand, theme, zen, profile…)
   On small / portrait screens they overlap because they grow
   wider than the viewport. Fix: shrink each button AND limit
   each half to ~50% of the viewport so they can never collide.
*/

/* Tablet landscape (≤ 1024px) — mild shrink */
@media (max-width: 1024px) {
    .top-ui-layer {
        top: 10px !important;
        left: 10px !important;
        right: 10px !important;
    }

    .ui-control-btn {
        width: 38px !important;
        height: 38px !important;
        font-size: 0.85rem !important;
    }

    .zen-btn {
        width: 28px !important;
        height: 28px !important;
        font-size: 0.75rem !important;
    }

    .zen-controls {
        gap: 3px !important;
        margin-right: 4px !important;
    }
}

/* Portrait tablet (≤ 900px) — more aggressive */
@media (max-width: 900px) {
    .ui-control-btn {
        width: 34px !important;
        height: 34px !important;
        font-size: 0.8rem !important;
    }

    /* Constrain each side to half viewport max */
    .fixed-ui-controls-left {
        max-width: 48vw !important;
        overflow-x: auto !important;
        -webkit-overflow-scrolling: touch !important;
        touch-action: pan-x !important;
        scrollbar-width: none !important;
        flex-shrink: 0;
    }

    .fixed-ui-controls {
        max-width: 50vw !important;
        overflow-x: auto !important;
        -webkit-overflow-scrolling: touch !important;
        touch-action: pan-x !important;
        scrollbar-width: none !important;
        flex-shrink: 0;
    }

    .fixed-ui-controls-left::-webkit-scrollbar,
    .fixed-ui-controls::-webkit-scrollbar { display: none; }
}

/* Portrait phone (≤ 600px) — maximum shrink, both bars scroll */
@media (max-width: 600px) {
    .top-ui-layer {
        top: 6px !important;
        left: 6px !important;
        right: 6px !important;
        gap: 4px !important;
    }

    .ui-control-btn {
        width: 30px !important;
        height: 30px !important;
        font-size: 0.75rem !important;
        border-radius: 10px !important;
    }

    /* Hide the student-count text label, keep the icon */
    .student-count-badge {
        font-size: 0.6rem !important;
        padding: 1px 3px !important;
    }

    /* Zen controls: hide in portrait to save space, keep in landscape */
    #zen-mode-controls {
        display: none !important;
    }

    .zen-controls { display: none !important; }

    .fixed-ui-controls-left {
        max-width: 50vw !important;
    }

    .fixed-ui-controls {
        max-width: 50vw !important;
    }
}


/* ── Bottom bar: scrollable horizontal strip ───────────────── */
/*
   On small screens the full bar overflows horizontally.
   Solution:
     • Give the bar a fixed max-width (100% of viewport)
     • Make .pinned-tools-container scroll horizontally
     • Keep .pinned-actions (collapse / unpin) always visible on the right
     • Shrink tool buttons to fit the bar height
*/

@media (max-width: 1024px) {
    .pinned-bottom-bar {
        /* Stay centred but allow full width */
        left: 50% !important;
        transform: translateX(-50%) !important;
        max-width: min(94vw, 900px) !important;
        padding: 5px 10px !important;
        gap: 0 !important;
        border-radius: 18px !important;
        /* Prevent bar itself from scrolling — only the container inside scrolls */
        overflow: hidden !important;
        /* Keep bar as a flex row */
        display: flex !important;
        align-items: center !important;
    }

    /* Scrollable tool strip */
    .pinned-tools-container {
        flex: 1 1 0 !important;
        min-width: 0 !important;          /* allow it to shrink */
        overflow-x: auto !important;
        overflow-y: hidden !important;
        -webkit-overflow-scrolling: touch !important;
        touch-action: pan-x !important;
        scroll-snap-type: x proximity;
        scrollbar-width: none !important;
        -ms-overflow-style: none !important;
        gap: 8px !important;
        padding: 4px 4px !important;      /* breathing room at ends */
        /* Fade edges to hint there's more content */
        mask-image: linear-gradient(
            to right,
            transparent 0px,
            black 10px,
            black calc(100% - 10px),
            transparent 100%
        );
        -webkit-mask-image: linear-gradient(
            to right,
            transparent 0px,
            black 10px,
            black calc(100% - 10px),
            transparent 100%
        );
    }

    .pinned-tools-container::-webkit-scrollbar { display: none; }

    /* Lock the pinned-actions (collapse + unpin) to the right edge */
    .pinned-actions {
        flex-shrink: 0 !important;
        margin-left: 6px !important;
        padding-left: 8px !important;
    }

    /* Shrink tool buttons */
    .pinned-bottom-bar .tool-btn {
        width: 34px !important;
        height: 34px !important;
        font-size: 0.9rem !important;
        flex-shrink: 0 !important;      /* never let buttons collapse */
    }

    .pinned-bottom-bar .active-color-btn {
        width: 28px !important;
        height: 28px !important;
        flex-shrink: 0 !important;
    }

    /* Pen-size dots in the bottom bar smaller */
    .pinned-bottom-bar .pen-size-dot {
        width: 8px !important;
        height: 8px !important;
    }

    /* Dividers stay thin */
    .pinned-bottom-bar .divider {
        flex-shrink: 0 !important;
        margin: 0 4px !important;
    }
}

/* Small tablet / portrait — even tighter */
@media (max-width: 768px) {
    .pinned-bottom-bar {
        max-width: 96vw !important;
        padding: 4px 8px !important;
        bottom: calc(14px + var(--safe-bottom)) !important;
    }

    .pinned-bottom-bar .tool-btn {
        width: 32px !important;
        height: 32px !important;
        font-size: 0.85rem !important;
    }

    .pinned-tools-container {
        gap: 6px !important;
    }
}

/* Portrait phone — smallest */
@media (max-width: 480px) {
    .pinned-bottom-bar {
        max-width: 98vw !important;
        padding: 3px 6px !important;
        border-radius: 16px !important;
        bottom: calc(12px + var(--safe-bottom)) !important;
    }

    .pinned-bottom-bar .tool-btn {
        width: 30px !important;
        height: 30px !important;
        font-size: 0.8rem !important;
    }

    .pinned-bottom-bar .active-color-btn {
        width: 24px !important;
        height: 24px !important;
    }

    .pinned-tools-container {
        gap: 5px !important;
    }

    /* Collapse & unpin buttons compact */
    .pinned-collapse-btn,
    .unpin-btn {
        width: 26px !important;
        height: 26px !important;
        font-size: 0.75rem !important;
    }
}