.site-header {
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    z-index: var(--z-header);
    width: 100%;
    background-color: var(--color-background);
    border-bottom: var(--border-width) var(--border-style) var(--color-border-light);
}

.site-navigation {
    width: 100%;
}

.site-navigation>.container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: var(--header-height);
    gap: var(--space-5);
}

/* Brand */

.site-brand {
    display: inline-flex;
    align-items: center;
    flex-shrink: 0;
    gap: var(--space-3);
    color: var(--color-text);
    font-family: var(--font-primary);
    font-weight: var(--font-weight-bold);
    transition: var(--transition-colors);
}

.site-brand:hover {
    color: var(--color-primary);
}

.site-brand__logo {
    display: block;
    width: 42px;
    height: 42px;
    border-radius: var(--border-radius-md);
}

.site-brand__name {
    font-family: var(--font-primary);
    font-size: var(--font-size-xl);
    line-height: 1;
    letter-spacing: -0.02em;
}

/* Navigation */

.navigation-menu {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--space-5);
    flex: 1;
    min-width: 0;
}

.navigation-list {
    display: flex;
    align-items: center;
    gap: var(--space-5);
    list-style: none;
    margin: 0;
    padding: 0;
}

.navigation-item {
    position: relative;
    display: flex;
    align-items: center;
}

.navigation-link {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    min-height: 44px;
    padding: 0;
    border: 0;
    background: transparent;
    color: var(--color-text-secondary);
    font-family: var(--font-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    line-height: 1.4;
    text-align: left;
    text-decoration: none;
    white-space: nowrap;
    cursor: pointer;
    transition: var(--transition-colors);
}

.navigation-link::after {
    content: "";
    position: absolute;
    right: 0;
    bottom: 4px;
    left: 0;
    height: 2px;
    background-color: var(--color-primary);
    border-radius: var(--border-radius-pill);
    transform: scaleX(0);
    transform-origin: center;
    transition: var(--transition-transform);
}

.navigation-link:hover,
.navigation-link:focus-visible,
.navigation-dropdown-toggle[aria-expanded="true"] {
    color: var(--color-primary);
}

.navigation-link:hover::after,
.navigation-link:focus-visible::after {
    transform: scaleX(1);
}

.navigation-dropdown-toggle i {
    font-size: 0.7em;
    transition: transform var(--transition-base);
}

.navigation-dropdown-toggle[aria-expanded="true"] i {
    transform: rotate(180deg);
}

.navigation-link:focus-visible,
.navigation-dropdown-toggle:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 4px;
    border-radius: var(--border-radius-sm);
}

/* Dropdown menus */

.navigation-submenu {
    position: absolute;
    top: 100%;
    left: 0;
    z-index: calc(var(--z-header) + 1);
    display: none;
    flex-direction: column;
    min-width: 210px;
    margin: 0;
    padding: var(--space-2);
    list-style: none;
    background-color: var(--color-background);
    border: var(--border-width) var(--border-style) var(--color-border-light);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-lg);
}

.navigation-submenu.is-open {
    display: flex;
}

.navigation-submenu li {
    width: 100%;
}

.navigation-submenu .navigation-link {
    display: flex;
    width: 100%;
    min-height: 42px;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--border-radius-sm);
    white-space: normal;
}

.navigation-submenu .navigation-link::after {
    display: none;
}

.navigation-submenu .navigation-link:hover,
.navigation-submenu .navigation-link:focus-visible {
    background-color: var(--color-background-soft);
}

/* Navigation actions */

.navigation-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    flex-shrink: 0;
    gap: var(--space-3);
}

.navigation-robofest {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: var(--button-height-md);
    padding-inline: var(--space-4);
    border: var(--border-width) var(--border-style) var(--color-primary);
    border-radius: var(--border-radius-pill);
    background-color: transparent;
    color: var(--color-primary);
    font-family: var(--font-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-bold);
    text-decoration: none;
    white-space: nowrap;
    flex-shrink: 0;
    transition:
        background-color var(--transition-base),
        color var(--transition-base),
        transform var(--transition-base);
}

.navigation-robofest:hover {
    background-color: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-1px);
}

.navigation-robofest:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 3px;
}

/* Primary CTA */

.navigation-cta {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: var(--button-height-md);
    padding-inline: var(--button-padding-x);
    flex-shrink: 0;
    border-radius: var(--border-radius-pill);
    background-color: var(--color-primary);
    color: var(--color-white);
    font-family: var(--font-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    text-align: center;
    text-decoration: none;
    white-space: nowrap;
    transition:
        background-color var(--transition-base),
        transform var(--transition-base),
        box-shadow var(--transition-base);
}

.navigation-cta:hover {
    background-color: var(--color-primary-dark);
    color: var(--color-white);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.navigation-cta:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 3px;
}

/* Mobile toggle */

.navigation-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    flex-shrink: 0;
    border: 0;
    border-radius: var(--border-radius-md);
    background: transparent;
    color: var(--color-text);
    cursor: pointer;
    transition: var(--transition-colors);
}

.navigation-toggle:hover,
.navigation-toggle:focus-visible {
    background-color: var(--color-background-soft);
    color: var(--color-primary);
}

.navigation-toggle:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Mobile overlay */

.navigation-overlay {
    position: fixed;
    inset: 0;
    z-index: calc(var(--z-header) - 1);
    background-color: rgba(16, 24, 40, 0.45);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition:
        opacity var(--transition-base),
        visibility var(--transition-base);
}

.navigation-overlay.is-visible {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

/* Mobile navigation */

@media (max-width: 1100px) {
    .site-navigation>.container {
        min-height: 72px;
    }

    .navigation-toggle {
        display: inline-flex;
    }

    .navigation-menu {
        position: absolute;
        top: 100%;
        right: 0;
        left: 0;
        display: none;
        flex-direction: column;
        align-items: stretch;
        justify-content: flex-start;
        gap: var(--space-4);
        padding: var(--space-5) var(--container-padding) var(--space-6);
        background-color: var(--color-background);
        border-bottom: var(--border-width) var(--border-style) var(--color-border);
        box-shadow: var(--shadow-lg);
        overflow-y: auto;
        max-height: calc(100vh - 72px);
    }

    .navigation-menu.is-open {
        display: flex;
    }

    .navigation-list {
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        width: 100%;
    }

    .navigation-item {
        display: flex;
        flex-direction: column;
        align-items: stretch;
        width: 100%;
    }

    .navigation-link {
        display: flex;
        width: 100%;
        min-height: 48px;
        font-size: var(--font-size-md);
    }

    .navigation-link::after {
        display: none;
    }

    .navigation-dropdown-toggle {
        justify-content: space-between;
    }

    .navigation-submenu {
        position: static;
        min-width: 0;
        width: 100%;
        padding: 0 0 0 var(--space-4);
        border: 0;
        border-radius: 0;
        background-color: transparent;
        box-shadow: none;
    }

    .navigation-submenu .navigation-link {
        min-height: 44px;
        padding-inline: var(--space-3);
        font-size: var(--font-size-sm);
    }

    .navigation-actions {
        flex-direction: column;
        align-items: stretch;
        width: 100%;
        gap: var(--space-3);
        padding-top: var(--space-2);
    }

    .navigation-robofest,
    .navigation-cta {
        width: 100%;
        min-height: var(--button-height-lg);
    }

}

@media (min-width: 1101px) {
    .navigation-overlay {
        display: none;
    }
}

@media (prefers-reduced-motion: reduce) {

    .site-brand,
    .navigation-link,
    .navigation-dropdown-toggle i,
    .navigation-submenu,
    .navigation-robofest,
    .navigation-cta,
    .navigation-toggle,
    .navigation-overlay {
        transition: none;
    }
}