/**
 * Mobile-Responsive Navigation Overrides
 * ----------------------------------------
 * Loaded AFTER navigation-menu.css and styles.css.
 * All mobile rules are scoped to media queries — desktop is untouched.
 *
 * Breakpoints:
 *   ≤480px  — small phones (full-width panel)
 *   ≤768px  — phones / small tablets (hamburger + accordion)
 *   769–1024px — tablets (condensed horizontal nav)
 *   ≥1025px — desktop (no changes)
 *
 * JS companion: /js/mobile-nav.js
 */

/* =================================================================
   CSS Custom Properties (design tokens for mobile nav)
   ================================================================= */
:root {
    --mn-overlay-bg: rgba(0, 0, 0, 0.5);
    --mn-panel-width: 82%;
    --mn-panel-max: 320px;
    --mn-panel-shadow: -4px 0 20px rgba(0, 0, 0, 0.15);
    --mn-transition-speed: 0.3s;
    --mn-tap-min: 44px;
    --mn-level1-bg: #f9fafb;
    --mn-level2-bg: #e0f2fe;
    --mn-level3-bg: #bfdbfe;
    --mn-accent: #1e40af;
    --mn-border-accent: #3b82f6;
}

/* =================================================================
   GLOBAL — Body Scroll Lock & Overlay
   ================================================================= */

body.mobile-nav-open {
    overflow: hidden;
    position: fixed;
    width: 100%;
    height: 100%;
}

body.mobile-nav-open::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--mn-overlay-bg);
    z-index: 999;
    animation: mnFadeIn var(--mn-transition-speed) ease;
}

@keyframes mnFadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}

/* =================================================================
   EXPLICIT Z-INDEX STACK
   Overlay: 999 → Navbar: 1000 → Nav menu panel: 1001
   Dropdown menus inherit from parent (static on mobile).
   ================================================================= */
.navbar {
    z-index: 1000;
}

/* =================================================================
   ≤768px — MOBILE / SMALL TABLET
   Primary mobile breakpoint: hamburger + slide-out + accordion
   ================================================================= */
@media screen and (max-width: 768px) {

    /* --- Nav container --- */
    .navbar .nav-container {
        padding: 0 0.75rem;
    }

    /* --- Hamburger button with icon toggle --- */
    .navbar .nav-toggle {
        display: flex;
        flex-direction: row !important;  /* override column from navigation-menu.css */
        position: relative;       /* REQUIRED for z-index to take effect */
        z-index: 1003;
        padding: 10px;
        min-width: var(--mn-tap-min);
        min-height: var(--mn-tap-min);
        align-items: center;
        justify-content: center;
        cursor: pointer;
        border: none;
        background: transparent;
        -webkit-tap-highlight-color: transparent;
        touch-action: manipulation;  /* prevent double-tap zoom delay */
    }

    /* Override old hamburger bar styles */
    .navbar .nav-toggle span {
        width: auto !important;
        height: auto !important;
        background: none !important;
        margin: 0 !important;
        border-radius: 0 !important;
    }

    /* Text toggle styles */
    .navbar .nav-toggle .hamburger-icon,
    .navbar .nav-toggle .close-icon {
        font-size: 0.9rem;
        font-weight: 600;
        color: #1f2937;
        text-transform: uppercase;
        letter-spacing: 0.5px;
        line-height: 1;
    }

    /* Default state: show "Menu", hide "Close" */
    .navbar .nav-toggle .hamburger-icon {
        display: inline-block;
    }
    .navbar .nav-toggle .close-icon {
        display: none;
    }

    /* Active state: hide "Menu", show "Close" */
    .navbar .nav-toggle.active .hamburger-icon {
        display: none;
    }
    .navbar .nav-toggle.active .close-icon {
        display: inline-block;
    }

    /* --- Slide-out panel --- */
    .navbar .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: var(--mn-panel-width);
        max-width: var(--mn-panel-max);
        height: 100vh;
        height: 100dvh; /* dynamic viewport height for mobile browsers */
        background: #ffffff;
        flex-direction: column;
        align-items: stretch;
        padding: 5rem 0 2rem;
        box-shadow: var(--mn-panel-shadow);
        transition: right var(--mn-transition-speed) cubic-bezier(0.4, 0, 0.2, 1);
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
        z-index: 1001;
        gap: 0;
        margin-left: 0;
        pointer-events: none;    /* prevent invisible touch capture when off-screen */
        visibility: hidden;      /* fully remove from hit-testing */
    }

    .navbar .nav-menu.active {
        right: 0;
        pointer-events: auto;   /* re-enable when visible */
        visibility: visible;
    }

    .navbar .nav-menu > li {
        width: 100%;
        border-bottom: 1px solid #f0f0f0;
    }

    .navbar .nav-menu > li:last-child {
        border-bottom: none;
    }

    /* --- Tap-friendly targets (WCAG ≥44px) --- */
    .navbar .nav-link {
        min-height: var(--mn-tap-min);
        display: flex;
        align-items: center;
        padding: 12px 16px;
        font-size: 0.95rem;
        width: 100%;
        box-sizing: border-box;
    }

    .navbar .dropdown-menu li a,
    .navbar .nested-dropdown-menu li a {
        min-height: var(--mn-tap-min);
        display: flex;
        align-items: center;
        padding: 12px 16px;
        font-size: 0.9rem;
        box-sizing: border-box;
    }

    /* --- Accordion: Level 1 dropdown --- */
    .navbar .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        border-radius: 0;
        margin-left: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1),
                    padding 0.25s ease;
        padding: 0;
        background: var(--mn-level1-bg);
        border-left: 3px solid var(--mn-border-accent);
    }

    .navbar .nav-dropdown.active > .dropdown-menu {
        max-height: 80vh;
        overflow-y: auto;
        padding: 4px 0;
    }

    /* --- Accordion: Level 2 nested --- */
    .navbar .nested-dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        border-radius: 0;
        margin-left: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s cubic-bezier(0.4, 0, 0.2, 1),
                    padding 0.2s ease;
        padding: 0;
        background: var(--mn-level2-bg);
        border-left: 3px solid var(--mn-border-accent);
    }

    .navbar .nav-dropdown-nested.active > .nested-dropdown-menu {
        max-height: 60vh;
        overflow-y: auto;
        padding: 4px 0;
    }

    /* --- Accordion: Level 3 nested (Pre School sub-items) --- */
    .navbar .nested-dropdown-menu .nested-dropdown-menu {
        background: var(--mn-level3-bg);
    }

    .navbar .nested-dropdown-menu .nav-dropdown-nested.active > .nested-dropdown-menu {
        max-height: 50vh;
        padding: 4px 0;
    }

    /* --- Indentation hierarchy --- */
    .navbar .dropdown-menu li a {
        padding-left: 24px;
    }

    .navbar .nested-dropdown-menu li a {
        padding-left: 36px;
    }

    .navbar .nested-dropdown-menu .nested-dropdown-menu li a {
        padding-left: 48px;
    }

    /* --- Arrow rotation on active --- */
    .navbar .nav-dropdown.active > .nav-link .dropdown-arrow {
        transform: rotate(180deg);
    }

    .navbar .nav-dropdown-nested.active > a .nested-arrow {
        transform: rotate(90deg);
    }

    /* --- Arrow base styles on mobile --- */
    .navbar .dropdown-arrow {
        margin-left: auto;
        padding-left: 8px;
        transition: transform var(--mn-transition-speed) ease;
    }

    .navbar .nested-arrow {
        margin-left: auto;
        padding-left: 8px;
        float: none;
        transition: transform var(--mn-transition-speed) ease;
    }

    /* --- Dropdown links: active item highlight --- */
    .navbar .dropdown-menu li a:active,
    .navbar .nested-dropdown-menu li a:active {
        background-color: #dbeafe;
    }

    /* --- Nested dropdown link layout --- */
    .navbar .nav-dropdown-nested > a {
        display: flex;
        justify-content: space-between;
        align-items: center;
        min-height: var(--mn-tap-min);
    }

    /* --- Remove hover styles on mobile (tap only) --- */
    .navbar .nav-dropdown:hover > .dropdown-menu {
        opacity: 1;
        visibility: visible;
        transform: none;
        /* max-height stays at 0 unless .active is toggled via JS */
    }

    .navbar .nav-dropdown-nested:hover > .nested-dropdown-menu {
        opacity: 1;
        visibility: visible;
        transform: none;
    }

    .navbar .dropdown-menu li a:hover {
        padding-left: 24px; /* prevent shift on hover */
    }

    .navbar .nested-dropdown-menu li a:hover {
        padding-left: 36px; /* prevent shift on hover */
    }

    .navbar .nested-dropdown-menu .nested-dropdown-menu li a:hover {
        padding-left: 48px; /* prevent shift on hover */
    }
}

/* =================================================================
   ≤480px — SMALL PHONES
   Full-width slide-out, compact sizing
   ================================================================= */
@media screen and (max-width: 480px) {

    .navbar .nav-menu {
        width: 100%;
        max-width: none;
    }

    .navbar .nav-link {
        font-size: 0.9rem;
        padding: 12px 14px;
    }

    .navbar .dropdown-menu li a,
    .navbar .nested-dropdown-menu li a {
        font-size: 0.85rem;
    }
}

/* =================================================================
   769px – 1024px — TABLETS
   Condensed horizontal nav to fit more items
   ================================================================= */
@media screen and (min-width: 769px) and (max-width: 1024px) {

    .navbar .nav-link {
        padding: 0.65rem 0.55rem;
        font-size: 0.78rem;
    }

    .navbar .dropdown-menu,
    .navbar .nested-dropdown-menu {
        min-width: 200px;
    }

    .navbar .dropdown-menu li a {
        padding: 10px 16px;
        font-size: 0.82rem;
    }

    .navbar .nested-dropdown-menu li a {
        padding: 9px 16px;
        font-size: 0.8rem;
    }
}

/* =================================================================
   ≥1025px — DESKTOP SAFETY NET
   Explicit resets to prevent any mobile CSS from leaking upward
   ================================================================= */
@media screen and (min-width: 1025px) {

    body.mobile-nav-open {
        overflow: auto;
        position: static;
        width: auto;
        height: auto;
    }

    body.mobile-nav-open::after {
        display: none;
    }

    .navbar .nav-toggle {
        display: none;
    }

    .navbar .nav-menu {
        position: static;
        width: auto;
        max-width: none;
        height: auto;
        background: transparent;
        flex-direction: row;
        padding: 0;
        box-shadow: none;
        overflow: visible;
        right: auto;
        transition: none;
    }
}

/* =================================================================
   TOUCH vs HOVER GUARD (Safari / iOS safe)
   Prevents accidental hover dropdown activation on touch devices.
   Scoped to ≤768px so tablet-landscape (769-1024px) still uses
   desktop hover dropdowns.
   ================================================================= */
@media (pointer: coarse) and (max-width: 768px) {
    .navbar .nav-dropdown:hover > .dropdown-menu {
        max-height: 0;
        padding: 0;
    }

    .navbar .nav-dropdown.active > .dropdown-menu {
        max-height: 80vh;
        padding: 4px 0;
    }

    .navbar .nav-dropdown-nested:hover > .nested-dropdown-menu {
        max-height: 0;
        padding: 0;
    }

    .navbar .nav-dropdown-nested.active > .nested-dropdown-menu {
        max-height: 60vh;
        padding: 4px 0;
    }
}

/* =================================================================
   PREFERS-REDUCED-MOTION
   Accessibility: disable animations for users with motion sensitivity
   ================================================================= */
@media (prefers-reduced-motion: reduce) {

    .navbar .nav-menu {
        transition: none;
    }

    .navbar .dropdown-menu,
    .navbar .nested-dropdown-menu {
        transition: none;
    }

    .navbar .dropdown-arrow,
    .navbar .nested-arrow {
        transition: none;
    }

    body.mobile-nav-open::after {
        animation: none;
    }

    .news-scroll-track {
        animation: none;
    }
}