/* Shared navigation behavior that preserves a stable navbar geometry. */
:root {
    --nav-height: 72px;
}

.nav,
.nav.scrolled {
    height: var(--nav-height);
    padding: 0;
    border-bottom: 1px solid transparent;
    transition:
        background-color 0.2s var(--ease-out),
        border-color 0.2s var(--ease-out),
        backdrop-filter 0.2s var(--ease-out);
}

.nav.scrolled {
    border-bottom-color: var(--border);
}

.nav > .container,
.nav-inner,
.nav-right {
    height: 100%;
}

.nav-links,
.nav-links > li {
    align-items: center;
}

.nav-links > li {
    display: flex;
}

.nav-links > li > a,
.tools-menu-trigger {
    min-height: 40px;
    line-height: 1;
    align-items: center;
}

.nav-links > li > a {
    display: flex;
}

.tools-menu {
    position: relative;
}

.tools-menu-trigger {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0;
    border: 0;
    background: none;
    color: var(--text-muted);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    font-weight: 400;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    cursor: pointer;
    transition: color 0.3s var(--ease-out);
}

.tools-menu-trigger,
.lang-current {
    min-height: 40px;
}

.nav-hamburger,
.theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: 0;
    transition:
        border-color 0.2s var(--ease-out),
        color 0.2s var(--ease-out),
        background-color 0.2s var(--ease-out);
}

.nav-hamburger:focus-visible,
.theme-toggle:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.nav-hamburger span {
    transition:
        transform 0.2s var(--ease-out),
        opacity 0.2s var(--ease-out);
}

.tools-menu-trigger:hover,
.tools-menu-trigger:focus-visible {
    color: var(--text-primary);
}

.tools-menu-trigger:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 4px;
}

.tools-menu-trigger::before {
    content: '⌄';
    order: 2;
    font-size: 0.8rem;
    line-height: 1;
    transition: transform 0.2s var(--ease-out);
}

.tools-menu:hover .tools-menu-trigger::before,
.tools-menu.open .tools-menu-trigger::before {
    transform: rotate(180deg);
}

.tools-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    left: 50%;
    z-index: 250;
    display: block;
    width: max-content;
    min-width: 260px;
    padding: var(--space-xs);
    border: 1px solid var(--border);
    background: var(--bg-elevated);
    list-style: none;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateX(-50%) translateY(-0.25rem);
    transition:
        opacity 0.16s var(--ease-out),
        transform 0.16s var(--ease-out),
        visibility 0s linear 0.16s;
}

.tools-menu:hover .tools-dropdown,
.tools-menu.open .tools-dropdown {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateX(-50%) translateY(0);
    transition-delay: 0s;
}

@media (hover: hover) and (pointer: fine) {
    .tools-menu::after {
        /* Keep hover continuous across the visual gap below the trigger. */
        content: '';
        position: absolute;
        top: 100%;
        left: 50%;
        width: max(100%, 260px);
        height: 1rem;
        transform: translateX(-50%);
    }
}

.nav-links .tools-dropdown a {
    display: block;
    padding: 0.8rem var(--space-md);
    color: var(--text-secondary);
    font-size: 0.76rem;
    line-height: 1.35;
    white-space: nowrap;
}

.nav-links .tools-dropdown a::after {
    display: none;
}

.nav-links .tools-dropdown a:hover,
.nav-links .tools-dropdown a:focus-visible {
    background: var(--accent);
    color: #FFFFFF;
}

.nav-links .tools-dropdown a:focus-visible {
    outline: 2px solid #FFFFFF;
    outline-offset: -3px;
}

.lang-selector {
    position: relative;
}

.lang-current {
    padding: 0 0.4rem;
    transition: color 0.2s var(--ease-out);
}

.lang-current:focus-visible {
    color: var(--text-primary);
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.lang-dropdown {
    top: calc(100% + 1rem);
    display: block;
    min-width: 180px;
    box-shadow: none;
    pointer-events: none;
    transform: translateY(-0.25rem);
    transition:
        opacity 0.16s var(--ease-out),
        transform 0.16s var(--ease-out),
        visibility 0s linear 0.16s;
}

.lang-selector:hover .lang-dropdown,
.lang-selector.open .lang-dropdown {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
    transition-delay: 0s;
}

.lang-selector:hover .lang-arrow,
.lang-selector.open .lang-arrow {
    transform: rotate(180deg);
}

@media (hover: hover) and (pointer: fine) {
    .lang-selector::after {
        /* Match the Tools menu by bridging the dropdown's visual gap. */
        content: '';
        position: absolute;
        top: 100%;
        right: 0;
        width: 180px;
        height: 1rem;
    }
}

.lang-option:hover,
.lang-option:focus-visible {
    background: var(--accent);
    color: #FFFFFF;
}

.lang-option:hover .lang-name,
.lang-option:focus-visible .lang-name {
    color: #FFFFFF;
    opacity: 1;
}

.lang-option:focus-visible {
    outline: 2px solid #FFFFFF;
    outline-offset: -3px;
}

@media (prefers-reduced-motion: reduce) {
    .tools-menu-trigger::before,
    .tools-dropdown,
    .lang-arrow,
    .lang-dropdown {
        transition: none;
    }
}

@media (max-width: 768px) {
    .nav,
    .nav.scrolled {
        height: var(--nav-height);
        padding: 0;
    }

    .nav-links {
        top: var(--nav-height);
        max-height: calc(100dvh - var(--nav-height));
        overflow-y: auto;
        align-items: stretch;
    }

    .nav-links > li {
        justify-content: center;
        width: 100%;
    }

    .tools-menu-trigger {
        display: flex !important;
        justify-content: center;
        width: 100%;
        padding: var(--space-sm) 0;
        font-size: 1rem;
    }

    .tools-dropdown {
        position: static;
        display: none;
        width: 100%;
        min-width: 0;
        margin-top: var(--space-sm);
        padding: var(--space-xs);
        border-color: var(--border);
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
        transform: none;
        transition: none;
    }

    .tools-menu:hover .tools-dropdown {
        display: none;
    }

    .tools-menu.open .tools-dropdown {
        display: block;
        transform: none;
    }

    .nav-links .tools-dropdown a {
        padding: 0.75rem var(--space-sm);
        font-size: 0.85rem;
    }

    .lang-selector,
    .lang-selector.mobile-visible {
        position: relative;
        inset: auto;
        display: block;
        padding: 0;
        border: 0;
        background: transparent;
    }

    .lang-selector.mobile-visible .lang-current {
        display: flex;
    }

    .lang-selector .lang-dropdown,
    .lang-selector.mobile-visible .lang-dropdown {
        position: absolute;
        top: calc(100% + 1rem);
        right: 0;
        left: auto;
        display: block;
        min-width: 180px;
        padding: var(--space-xs);
        border: 1px solid var(--border);
        background: var(--bg-elevated);
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        transform: translateY(-0.25rem);
    }

    .lang-selector:hover .lang-dropdown,
    .lang-selector.mobile-visible:hover .lang-dropdown {
        opacity: 0;
        visibility: hidden;
        pointer-events: none;
        transform: translateY(-0.25rem);
    }

    .lang-selector.open .lang-dropdown,
    .lang-selector.mobile-visible.open .lang-dropdown {
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
        transform: translateY(0);
    }

    .lang-selector.mobile-visible .lang-option {
        display: flex;
        padding: 0.65rem 0.75rem;
        border: 0;
    }

    .lang-selector.mobile-visible .lang-option.active {
        border: 0;
        background: transparent;
    }
}