/* ============================================================
   NAVIGATION — koji-academy-theme/css/navigation.css
   Site header, main nav, dropdowns, mobile menu, login button
   ============================================================ */

/* Site header */
.site-header {
    background: var(--color-bg-alt);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 74px;
    gap: var(--space-sm);
    position: relative;
}

/* Logo */
.site-logo {
    flex-shrink: 0;
}
.site-logo img,
.site-logo .custom-logo {
    height: 60px;
    width: auto;
    display: block;
}
.site-logo__text {
    font-size: var(--text-xl);
    font-weight: 800;
    color: var(--color-heading);
    text-decoration: none;
}
.site-logo__text:hover {
    color: var(--color-primary);
    text-decoration: none;
}

/* Main nav — desktop */
.main-nav {
    display: flex;
    align-items: center;
    flex: 1;
    justify-content: flex-end;
    margin-right: var(--space-sm);
}
.main-nav ul {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 2px;
    align-items: center;
}
.main-nav a {
    display: block;
    padding: 0.5rem 0.75rem;
    font-weight: 600;
    font-size: var(--text-sm);
    color: var(--color-heading);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: background-color var(--transition), color var(--transition);
    white-space: nowrap;
}
.main-nav a:hover,
.main-nav a[aria-current="page"] {
    background-color: rgba(123,170,184,0.2);
    color: var(--color-heading);
    text-decoration: none;
}

/* Sub-menus — hidden by default at ALL screen sizes */
.main-nav .sub-menu {
    display: none;
}

/* Desktop dropdowns — show on hover/focus */
@media (min-width: 901px) {

    .main-nav li {
        position: relative;
        margin: 0;
        width: 100%;
        text-align: center;
    }

    .main-nav .sub-menu {
        position: absolute;
        top: 100%;
        right: 0;
        background: var(--color-bg-alt);
        border: 1px solid var(--color-border);
        border-radius: var(--radius-md);
        box-shadow: var(--shadow-md);
        min-width: 220px;
        padding: var(--space-xs);
        flex-direction: column;
        gap: 2px;
        z-index: 200;
    }

    .main-nav li:hover > .sub-menu,
    .main-nav li:focus-within > .sub-menu {
        display: flex;
    }

    .main-nav .sub-menu a {
        font-size: var(--text-sm);
        color: var(--color-body);
        padding: 0.625rem 0.875rem;
        border-radius: var(--radius-sm);
        white-space: nowrap;
    }
    .main-nav .sub-menu a:hover {
        background-color: var(--color-bg);
        color: var(--color-heading);
    }

    /* Hide Astra injected elements on desktop */
    .main-nav .ast-menu-toggle { display: none !important; }
    .main-nav .dropdown-menu-toggle { display: none !important; }
    .main-nav .ast-header-navigation-arrow { display: none !important; }
    .main-nav .ast-icon { display: none !important; }

    /* Our own dropdown indicator */
    .main-nav .menu-item-has-children > .menu-link::after {
        content: '▾';
        font-size: 0.7em;
        margin-left: 0.25rem;
        opacity: 0.6;
    }
}

/* Login button — always visible, far right */
.header-login-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.625rem 1.125rem;
    background-color: var(--color-primary);
    color: #fff;
    border-radius: var(--radius-md);
    font-family: var(--font-primary);
    font-size: var(--text-sm);
    font-weight: 700;
    text-decoration: none;
    white-space: nowrap;
    min-height: 44px;
    flex-shrink: 0;
    transition: background-color var(--transition), transform var(--transition);
}
.header-login-btn:hover {
    background-color: var(--color-primary-hover);
    color: #fff;
    text-decoration: none;
    transform: translateY(-1px);
}
.header-login-btn:focus-visible {
    outline: 3px solid var(--color-focus);
    outline-offset: 3px;
}

/* Mobile nav toggle — hidden on desktop */
.nav-toggle {
    display: none;
    background: none;
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-sm);
    padding: 0.5rem;
    cursor: pointer;
    color: var(--color-heading);
    min-width: 44px;
    min-height: 44px;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: background-color var(--transition);
    order: -1;
}
.nav-toggle:hover {
    background-color: var(--color-primary);
    color: #fff;
}

/* ============================================================
   MOBILE & TABLET — max 900px
   Layout: Burger (left) | Logo (centre) | Login (right)
   ============================================================ */
@media (max-width: 900px) {

    .site-header__inner {
        display: grid;
        grid-template-columns: 44px 1fr 44px;
        align-items: center;
        gap: var(--space-xs);
    }
    
    .icon-arrow {
    	display: flex;
    }
    
    .ast-arrow-svg {
    	margin: 0 !important;
    }

    /* Burger — left */
    .nav-toggle {
        display: flex;
        grid-column: 1;
    }

    /* Logo — centre */
    .site-logo {
        grid-column: 2;
        display: flex;
        justify-content: center;
    }

    /* Login button — right, icon only on small screens */
    .header-login-btn {
        grid-column: 3;
        padding: 0.5rem;
        justify-content: center;
        width: 44px;
    }
    .header-login-btn__text {
        display: none;
    }

    /* Nav — full width dropdown fixed to viewport */
    .main-nav {
        display: none;
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--color-bg-alt);
        border-bottom: 1px solid var(--color-border);
        padding: var(--space-sm);
        box-shadow: var(--shadow-md);
        z-index: 99;
        margin: 0;
        flex-direction: column;
        align-items: stretch;
    }
    .main-nav.is-open {
        display: flex;
    }
    .main-nav ul {
        flex-direction: column;
        gap: 4px;
        width: 100%;
    }
    
    .main-nav li {
        width: 100%;
    }
    
    .main-nav a {
        padding: 0.75rem 0.875rem;
        width: 100%;
    }

    /* Parent items — flex row so link and toggle sit side by side */
    .main-nav .menu-item-has-children {
        display: flex;
        flex-wrap: wrap;
        align-items: center;
    }
    .main-nav .menu-item-has-children > a {
        flex: 1;
    }

    /* Astra sub-menu toggle button — show on mobile */
    .main-nav .ast-menu-toggle {
        display: flex !important;
        background: none;
        border: 1px solid var(--color-border);
        border-radius: var(--radius-sm);
        cursor: pointer;
        padding: 0.5rem;
        color: var(--color-heading);
        min-width: 44px;
        min-height: 44px;
        align-items: center;
        justify-content: center;
        transition: background-color var(--transition);
        flex-shrink: 0;
    }
    .main-nav .ast-menu-toggle:hover {
        background-color: rgba(123,170,184,0.2);
    }

    /* Sub-menus — hidden by default, shown when parent has is-open */
    .main-nav .sub-menu {
        display: none;
        position: static;
        box-shadow: none;
        border: none;
        border-left: 3px solid var(--color-sky-blue);
        padding: var(--space-xs) 0 var(--space-xs) var(--space-sm);
        background: var(--color-bg);
        border-radius: 0;
        margin-top: 4px;
        min-width: unset;
        width: 100%;
        flex-direction: column;
        gap: 2px;
    }

    /* Open state — toggled by JS adding is-open to parent li */
    .main-nav .menu-item-has-children.is-open > .sub-menu {
        display: flex;
    }

    .main-nav .sub-menu a {
        padding: 0.625rem 0.5rem;
        white-space: normal;
        font-size: var(--text-sm);
    }
    .main-nav .sub-menu .ast-icon {
        display: none !important;
    }
}

/* Slightly larger screens — show login text again */
@media (min-width: 480px) and (max-width: 900px) {
    .site-header__inner {
        grid-template-columns: 44px 1fr auto;
    }
    .header-login-btn {
        width: auto;
        padding: 0.625rem 1rem;
    }
    .header-login-btn__text {
        display: inline;
    }
}

/* Dark mode compatibility */
body.a11y-dark .site-header {
    background-color: #1e1e1e;
    border-color: #333;
}
body.a11y-dark .main-nav a {
    color: #f0f0f0;
}
body.a11y-dark .main-nav .sub-menu {
    background: #2a2a2a;
    border-color: #444;
}
body.a11y-dark .main-nav .sub-menu a {
    color: #e0e0e0;
}
body.a11y-dark .main-nav .sub-menu a:hover {
    background: #333;
}