/* =================================================================
   DROPDOWN MENU SYSTEM - UNIVERSAL IMPLEMENTATION
   Compatible with existing mobile-nav.css
   ================================================================= */

/* =================================================================
   DROPDOWN STRUCTURE - DESKTOP
   ================================================================= */

/* Sub-menu containers */
.main-navigation .nav-menu .menu-item {
    position: relative;
}

.main-navigation .nav-menu .sub-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 220px;
    background: white;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    border-radius: 8px;
    border: 1px solid var(--qm-border-color, #e0e0e0);
    z-index: 1000;

    /* Hidden by default */
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;

    /* Reset list styles */
    list-style: none;
    margin: 0;
    padding: 0.75rem 0;

    /* Force vertical layout for submenu */
    display: flex !important;
    flex-direction: column !important;
}

/* Show dropdown on hover */
.main-navigation .nav-menu .menu-item:hover > .sub-menu,
.main-navigation .nav-menu .menu-item:focus-within > .sub-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* Dropdown menu items */
.main-navigation .sub-menu .menu-item {
    display: block;
    width: 100%;
}

.main-navigation .sub-menu a {
    display: block;
    padding: 0.75rem 1.25rem;
    color: var(--qm-text-primary, #333);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 400;
    border-bottom: none;
    transition: all 0.2s ease;

    /* Reset parent menu padding */
    padding-top: 0.75rem;
    padding-bottom: 0.75rem;
}

.main-navigation .sub-menu a:hover {
    background: var(--qm-background-light, #f8f9fa);
    color: var(--qm-accent-color, #007cba);
    padding-left: 1.5rem; /* Subtle indent on hover */
}

/* Parent menu item indicator */
.main-navigation .menu-item-has-children > a::after {
    content: '▼';
    font-size: 0.7em;
    margin-left: 0.5rem;
    opacity: 0.6;
    transition: transform 0.2s ease;
}

.main-navigation .menu-item-has-children:hover > a::after {
    transform: rotate(180deg);
}

/* =================================================================
   DROPDOWN STRUCTURE - MOBILE
   ================================================================= */

@media screen and (max-width: 1024px) {

    /* Mobile dropdown styling */
    .menu-container .nav-menu .sub-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        border: none;
        border-radius: 0;
        background: var(--qm-background-light, #f8f9fa);
        margin: 0.5rem 0 0 0;
        padding: 0;

        /* Hidden by default on mobile */
        display: none;
    }

    /* Show mobile submenu when parent is active */
    .menu-container .nav-menu .menu-item-has-children.is-open > .sub-menu {
        display: block;
    }

    /* Mobile submenu items */
    .menu-container .sub-menu .menu-item {
        border-bottom: 1px solid var(--qm-border-color, #e0e0e0);
        margin-left: 1rem;
    }

    .menu-container .sub-menu .menu-item:last-child {
        border-bottom: none;
    }

    .menu-container .sub-menu a {
        padding: 0.75rem 1rem;
        font-size: 0.9rem;
        color: var(--qm-text-secondary, #666);
        border-left: 3px solid var(--qm-accent-color, #007cba);
        white-space: nowrap;
    }

    .menu-container .sub-menu a:hover {
        background: white;
        color: var(--qm-accent-color, #007cba);
        padding-left: 1.25rem;
    }

    /* Mobile parent menu indicator */
    .menu-container .menu-item-has-children > a {
        position: relative;
    }

    .menu-container .menu-item-has-children > a::after {
        content: '+';
        position: absolute;
        right: 0;
        top: 50%;
        transform: translateY(-50%);
        font-size: 1.2em;
        color: var(--qm-accent-color, #007cba);
        font-weight: bold;
        transition: transform 0.2s ease;
    }

    .menu-container .menu-item-has-children.is-open > a::after {
        content: '−';
        transform: translateY(-50%) rotate(0deg);
    }
}

/* =================================================================
   ACCESSIBILITY & TOUCH IMPROVEMENTS
   ================================================================= */

/* Focus states for keyboard navigation */
.main-navigation .nav-menu a:focus,
.main-navigation .sub-menu a:focus {
    outline: 2px solid var(--qm-accent-color, #007cba);
    outline-offset: 2px;
}

/* Touch-friendly hover states on mobile */
@media (hover: none) and (pointer: coarse) {
    .main-navigation .menu-item:hover > .sub-menu {
        opacity: 0;
        visibility: hidden;
    }
}

/* Prevent dropdown from extending beyond viewport */
.main-navigation .nav-menu .menu-item:last-child .sub-menu {
    left: auto;
    right: 0;
}

/* =================================================================
   THEME COLOR INTEGRATION
   ================================================================= */

/* Use existing color scheme */
.main-navigation .sub-menu {
    background: var(--qm-background-primary, white);
    border-color: var(--qm-border-color, #e0e0e0);
}

.main-navigation .sub-menu a:hover {
    background: var(--qm-background-light, #f8f9fa);
    color: var(--qm-accent-color, #007cba);
}