/* CSS-Only Mobile Menu Fallback (works without JavaScript) */

/* Hidden checkbox for CSS-only toggle */
#mobile-menu-checkbox {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
    pointer-events: none;
}

/* Label styled as hamburger button */
.mobile-menu-label {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 44px;
    height: 44px;
    cursor: pointer;
    z-index: 1001;
    position: relative;
}

.mobile-menu-label .hamburger-line {
    width: 20px;
    height: 2px;
    background: var(--color-text-primary, #1e293b);
    margin: 2px 0;
    transition: all 0.3s ease;
    display: block;
}

/* Hide label on desktop */
@media (min-width: 1024px) {
    .mobile-menu-label {
        display: none;
    }
}

/* CSS-only menu open state */
#mobile-menu-checkbox:checked ~ .mobile-nav-overlay,
#mobile-menu-checkbox:checked + .mobile-menu-label + .mobile-nav-overlay {
    transform: translateX(0);
    visibility: visible;
    opacity: 1;
}

/* Hamburger animation when checked */
#mobile-menu-checkbox:checked ~ .mobile-menu-label .hamburger-line:nth-child(1),
#mobile-menu-checkbox:checked + .mobile-menu-label .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

#mobile-menu-checkbox:checked ~ .mobile-menu-label .hamburger-line:nth-child(2),
#mobile-menu-checkbox:checked + .mobile-menu-label .hamburger-line:nth-child(2) {
    opacity: 0;
}

#mobile-menu-checkbox:checked ~ .mobile-menu-label .hamburger-line:nth-child(3),
#mobile-menu-checkbox:checked + .mobile-menu-label .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile nav overlay base styles */
.mobile-nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-bg-primary, #ffffff);
    z-index: 999;
    transform: translateX(-100%);
    transition: transform 0.3s ease, visibility 0.3s ease, opacity 0.3s ease;
    visibility: hidden;
    opacity: 0;
    overflow-y: auto;
    padding-top: 80px;
}

/* RTL support */
.rtl-dir .mobile-nav-overlay {
    transform: translateX(100%);
}

.rtl-dir #mobile-menu-checkbox:checked ~ .mobile-nav-overlay,
.rtl-dir #mobile-menu-checkbox:checked + .mobile-menu-label + .mobile-nav-overlay {
    transform: translateX(0);
}

/* Close button for CSS-only menu */
.mobile-menu-close-label {
    position: absolute;
    top: var(--space-4, 1rem);
    right: var(--space-4, 1rem);
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    background: var(--color-bg-secondary, #f8fafc);
    border-radius: var(--radius-md, 0.375rem);
    z-index: 1000;
}

.rtl-dir .mobile-menu-close-label {
    right: auto;
    left: var(--space-4, 1rem);
}

.mobile-menu-close-label::before,
.mobile-menu-close-label::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 2px;
    background: var(--color-text-primary, #1e293b);
}

.mobile-menu-close-label::before {
    transform: rotate(45deg);
}

.mobile-menu-close-label::after {
    transform: rotate(-45deg);
}

/* CSS-only submenu toggle using :target */
.mobile-nav-submenu {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.mobile-nav-item:focus-within .mobile-nav-submenu,
.mobile-nav-item:hover .mobile-nav-submenu {
    max-height: 500px;
}

/* Focus styles for accessibility */
.mobile-menu-label:focus-visible,
.mobile-menu-close-label:focus-visible {
    outline: 2px solid var(--color-primary, #2563eb);
    outline-offset: 2px;
}

/* Prevent body scroll when menu is open (CSS-only approach) */
body:has(#mobile-menu-checkbox:checked) {
    overflow: hidden;
}

/* Fallback for browsers that don't support :has() */
@supports not selector(:has(*)) {
    /* JS will handle body scroll lock */
}

/* Dark mode */
[data-theme="dark"] .mobile-menu-label .hamburger-line {
    background: var(--color-text-primary, #f1f5f9);
}

[data-theme="dark"] .mobile-menu-close-label {
    background: var(--color-bg-secondary, #1e293b);
}

[data-theme="dark"] .mobile-menu-close-label::before,
[data-theme="dark"] .mobile-menu-close-label::after {
    background: var(--color-text-primary, #f1f5f9);
}