/*
 * ============================================================
 *  Zadro.ai — Header & Navigation
 * ============================================================
 *
 *  Depends on: main.css (design tokens must be loaded first)
 *
 *  Covers:
 *    1. Nav tokens
 *    2. Desktop navigation & submenus
 *    3. Mobile offcanvas menu
 *    4. Mobile submenu toggles
 * ============================================================
 */


/* ============================================================
   1. NAV TOKENS
   ============================================================ */

:root {
    --menu-link-color:          var(--bs-body-color);
    --menu-link-color-hover:    var(--theme);
    --close-icon-color:         var(--theme);
    --collapse-link-color:      var(--theme);
    --sub-nav-border-radius:    var(--bs-border-radius-lg);
    --sub-nav-bg:               var(--bs-body-bg);
    --sub-nav-border:           var(--bs-border-color);
    --sub-nav-shadow:           var(--bs-box-shadow-lg);
}

[data-bs-theme="dark"] {
    --menu-link-color:          var(--bs-body-color);
    --sub-nav-bg:               var(--bs-tertiary-bg);
    --sub-nav-border:           var(--bs-border-color);
    --sub-nav-shadow:           0 10px 30px rgba(0, 0, 0, 0.40);
}


/* ============================================================
   2. DESKTOP NAVIGATION
   ============================================================ */

.navbar { transition: all .3s ease; }

.navbar .nav-item    { height: 100%; }
.navbar .has-subnav  { position: relative; }

/*
 * Dropdown submenu — hidden by default, revealed on parent hover.
 * Uses visibility + opacity for smooth CSS transition
 * (display:none can't transition).
 */
.navbar .sub-menu {
    position: absolute;
    z-index: 1000;
    padding: 0;
    margin-top: 10px;
    list-style: none;
    text-align: left;
    background: var(--sub-nav-bg);
    border-radius: var(--sub-nav-border-radius);
    box-shadow: var(--sub-nav-shadow);
    border: 1px solid var(--sub-nav-border);
    visibility: hidden;
    opacity: 0;
    transition: margin 0.3s ease-out, opacity 0.3s ease-in;
}

/* Align submenu to right edge of parent */
.navbar .sub-menu.sub-menu-right { right: 0; }

.navbar .sub-menu li  { display: block; padding: 0 0.25rem; }

.navbar .sub-menu a {
    font-size: 1rem;
    color: var(--menu-link-color);
    white-space: nowrap;
}
.navbar .sub-menu a:hover { color: var(--menu-link-color-hover); }

/* Slide in on parent hover */
.navbar li:hover > .sub-menu {
    margin-top: 0;
    visibility: visible;
    opacity: 1;
}

/* Nested submenu — offset to the right */
.navbar .sub-menu li:hover > .sub-menu {
    left: 230px;
    margin-top: -40px;
}


/* ============================================================
   3. MOBILE OFFCANVAS MENU
   ============================================================
   Breakpoint matches navbar-expand-lg (991px).
   Update if you change the navbar breakpoint:
     sm: 575px | md: 767px | lg: 991px | xl: 1199px | xxl: 1399px
   ============================================================ */

@media (max-width: 991px) {

    /*
     * Offcanvas panel — slides in from the right.
     * Uses transform rather than left/right for GPU compositing.
     */
    .offcanvas-collapse {
        position: fixed;
        z-index: 1001;
        top: 0;
        bottom: 0;
        left: 100%;
        width: 300px;
        padding: 2.75rem 1rem 1rem;
        overflow-y: auto;
        visibility: hidden;
        background-color: var(--bs-body-bg);
        transition: transform .3s ease-in-out, visibility .3s ease-in-out;
    }

    .offcanvas-collapse.open {
        visibility: visible;
        transform: translateX(-100%);
    }

    /* ── Close icon ── */
    .close-icon {
        position: absolute;
        top: 0.75rem;
        left: 1rem;
        width: 22px;
        height: 22px;
        cursor: pointer;
        z-index: 1001;
        background: #999;
        border-radius: 2px;
    }

    .close-icon:before,
    .close-icon:after {
        content: "";
        position: absolute;
        top: 50%;
        left: 50%;
        width: 13px;
        height: 2px;
        background: white;
        transform: translate(-50%, -50%) rotate(45deg);
    }

    .close-icon:after  { transform: translate(-50%, -50%) rotate(-45deg); }
    .close-icon:hover  { background: var(--close-icon-color); }

    /* ── Nav links ── */
    .navbar .navbar-collapse > li + li {
        border-top: 1px solid var(--bs-border-color);
    }

    .navbar .dropdown-toggle:after  { display: none; }
    .navbar .navbar-toggler:focus   { box-shadow: none; }

    .navbar .navbar-collapse a {
        color: var(--menu-link-color);
        font-size: 1.2rem;
        padding: 7px 0 !important;
        margin: 0 !important;
    }

    .navbar .navbar-collapse a:hover,
    .navbar .navbar-collapse a.active { color: var(--menu-link-color-hover); }

    /* ── Hamburger toggler ── */
    .navbar .navbar-toggler {
        padding: 0;
        border: 0;
        font-size: 1.5rem;
        outline: 0;
    }

    /* Scrim overlay behind open menu */
    .navbar .navbar-toggler.open:before {
        content: "";
        position: fixed;
        z-index: -1;
        inset: 0;
        background: rgba(0, 0, 0, 0.5);
        opacity: 1;
        transition: opacity .2s ease-in-out;
    }

    .navbar .navbar-toggler:before { width: 0; opacity: 0; }


/* ============================================================
   4. MOBILE SUBMENU TOGGLES
   ============================================================ */

    /*
     * Submenus collapse to max-height: 0 by default.
     * JS adds .active to expand — max-height transition
     * creates the accordion effect.
     */
    .navbar li .sub-menu {
        position: relative;
        width: 100%;
        max-height: 0;
        margin: 0 !important;
        padding-left: 0.8em;
        overflow: hidden;
        border: none;
        box-shadow: none;
        opacity: 1;
        visibility: visible;
        transition: max-height 0.5s ease-out;
    }

    .navbar li .sub-menu.active {
        max-height: 36rem;
        transition: max-height 1s ease-in-out;
    }

    /*
     * Toggle icon — plus/minus indicator on right edge of nav item.
     * ::before is the horizontal bar (always visible).
     * ::after is the vertical bar (rotates away when active).
     */
    .navbar .has-subnav .toggle-link {
        position: absolute;
        top: 6px;
        right: 0;
        width: 30px;
        height: 30px;
        cursor: pointer;
        z-index: 1001;
    }

    .navbar .has-subnav .toggle-link:before,
    .navbar .has-subnav .toggle-link:after {
        content: "";
        position: absolute;
        top: 50%;
        left: 50%;
        width: 18px;
        height: 2px;
        background: var(--collapse-link-color);
        transform: translate(-50%, -50%);
        transition: transform 0.5s ease;
    }

    /* Vertical bar hidden when submenu is open (.active added by JS) */
    .navbar .has-subnav .toggle-link:not(.active):after {
        transform: translate(-50%, -50%) rotate(90deg);
    }

} /* end @media (max-width: 991px) */