:root {
    --nav-primary: #4caf50;
    --nav-primary-dark: #3f9442;
    --nav-primary-soft: #edf7ee;
    --nav-primary-hover: #f5fbf5;
    --nav-accent: #bd5800;

    --nav-text: #1f2933;
    --nav-muted: #64748b;
    --nav-border: #dce9dd;
    --nav-bg: rgba(255, 255, 255, 0.98);
    --nav-shadow: 0 10px 28px rgba(15, 23, 42, 0.14);
    --nav-radius: 12px;
}

#navbar {
    position: sticky;
    top: 0;
    z-index: 99999;
}

.site-header,
.site-nav,
.nav-item,
.dropdown-menu {
    z-index: 99999;
}

/* Turns sticky navbar off on selected pages */
body.navbar-not-sticky #navbar {
    position: static;
}

.site-header {
    position: relative;
    background: var(--nav-bg);
    border-bottom: 1px solid var(--nav-border);
    box-shadow: 0 4px 16px rgba(15, 23, 42, 0.12);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    font-family: Arial, Helvetica, sans-serif;
}

.site-header-inner {
    max-width: 1320px;
    min-height: 58px;
    margin: 0 auto;
    padding: 0 22px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
}

.site-title {
    color: var(--nav-primary-dark);
    font-size: 23px;
    font-weight: 800;
    letter-spacing: 0.15px;
    text-decoration: none;
    white-space: nowrap;
    line-height: 1;
}

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

.site-title:focus-visible,
.nav-link:focus-visible,
.nav-button:focus-visible,
.mobile-menu-button:focus-visible,
.dropdown-menu a:focus-visible {
    outline: 3px solid rgba(76, 175, 80, 0.28);
    outline-offset: 3px;
}

.site-nav {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 3px;
}

.nav-item {
    position: relative;
}

.nav-link,
.nav-button {
    appearance: none;
    border: 0;
    background: transparent;
    color: var(--nav-text);
    font-size: 13.5px;
    font-weight: 700;
    padding: 10px 11px;
    border-radius: 999px;
    cursor: pointer;
    text-decoration: none;
    display: flex;
    align-items: center;
    line-height: 1;
    transition:
        background-color 160ms ease,
        color 160ms ease,
        box-shadow 160ms ease;
}

.nav-link:hover,
.nav-button:hover {
    color: var(--nav-primary-dark);
    background: var(--nav-primary-soft);
}

.nav-item.active > .nav-link,
.nav-item.active > .nav-button {
    color: #ffffff;
    background: var(--nav-primary);
    box-shadow: 0 4px 12px rgba(76, 175, 80, 0.25);
}

.has-dropdown > .nav-button::after {
    content: "";
    width: 6px;
    height: 6px;
    margin-left: 8px;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: rotate(45deg) translateY(-1px);
}

.dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 290px;
    padding: 8px;
    background: #ffffff;
    border: 1px solid var(--nav-border);
    border-radius: 0 0 var(--nav-radius) var(--nav-radius);
    box-shadow: var(--nav-shadow);
    overflow: hidden;
}

.dropdown-menu.align-right {
    left: auto;
    right: 0;
}

.nav-item:hover .dropdown-menu,
.nav-item:focus-within .dropdown-menu {
    display: block;
}

.dropdown-menu a {
    display: block;
    padding: 10px 12px;
    color: var(--nav-text);
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    border-radius: 8px;
    white-space: nowrap;
    transition:
        background-color 150ms ease,
        color 150ms ease,
        padding-left 150ms ease;
}

.dropdown-menu a:hover,
.dropdown-menu a.active {
    background: var(--nav-primary-hover);
    color: var(--nav-primary-dark);
    padding-left: 16px;
}

.external-link::after {
    content: "↗";
    margin-left: 6px;
    font-size: 11px;
    color: var(--nav-muted);
}

.mobile-menu-button,
.theme-toggle-button {
    display: none;
    appearance: none;
    border: 0;
    background: var(--nav-primary);
    color: #ffffff;
    width: 40px;
    height: 38px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 24px;
    line-height: 1;
    box-shadow: 0 4px 12px rgba(76, 175, 80, 0.25);
}

.mobile-menu-button:hover,
.theme-toggle-button:hover {
    background: var(--nav-primary-dark);
}

.site-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

@media screen and (max-width: 1180px) {
    .site-header-inner {
        padding: 0 14px;
        gap: 10px;
    }

    .site-title {
        font-size: 21px;
    }

    .nav-link,
    .nav-button {
        font-size: 13px;
        padding: 10px 8px;
    }
}

@media screen and (max-width: 980px) {
    .site-header-inner {
        min-height: 58px;
        flex-wrap: wrap;
    }

    .site-title {
        font-size: 22px;
    }

    .mobile-menu-button {
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    .theme-toggle-button {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        font-size: 20px;
    }

    .site-nav {
        display: none;
        width: 100%;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 6px 0 12px;
    }

    .site-nav.open {
        display: flex;
    }

    .nav-item {
        width: 100%;
        border-top: 1px solid var(--nav-border);
    }

    .nav-link,
    .nav-button {
        width: 100%;
        justify-content: space-between;
        padding: 14px 12px;
        border-radius: 0;
        font-size: 16px;
    }

    .nav-item.active > .nav-link,
    .nav-item.active > .nav-button {
        border-radius: 8px;
    }

    .has-dropdown > .nav-button::after {
        content: "+";
        width: auto;
        height: auto;
        margin-left: 0;
        border: 0;
        transform: none;
        font-size: 19px;
        font-weight: 700;
    }

    .nav-item.open > .nav-button::after {
        content: "−";
    }

    .dropdown-menu {
        position: static;
        display: none;
        min-width: 100%;
        padding: 5px 0 8px;
        background: #f7fbf7;
        border: 0;
        border-radius: 0;
        box-shadow: none;
    }

    .nav-item.open .dropdown-menu {
        display: block;
    }

    .nav-item:hover .dropdown-menu,
    .nav-item:focus-within .dropdown-menu {
        display: none;
    }

    .nav-item.open:hover .dropdown-menu,
    .nav-item.open:focus-within .dropdown-menu {
        display: block;
    }

    .dropdown-menu a {
        padding: 11px 24px;
        font-size: 15px;
        white-space: normal;
    }

    .dropdown-menu a:hover,
    .dropdown-menu a.active {
        padding-left: 30px;
    }
}

/* Future dark mode support.
   This only activates if JS adds data-theme="dark" to <html>. */

:root[data-theme="dark"] {
    --nav-primary: #66bb6a;
    --nav-primary-dark: #9bd99f;
    --nav-primary-soft: #15301b;
    --nav-primary-hover: #1c3d22;
    --nav-accent: #f4a261;

    --nav-text: #e5edf5;
    --nav-muted: #a9b7c6;
    --nav-border: #263b2b;
    --nav-bg: rgba(12, 22, 16, 0.98);
    --nav-shadow: 0 10px 28px rgba(0, 0, 0, 0.35);
}

:root[data-theme="dark"] .site-header {
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.35);
}

:root[data-theme="dark"] .dropdown-menu {
    background: #101f14;
}

:root[data-theme="dark"] .dropdown-menu a {
    color: var(--nav-text);
}

:root[data-theme="dark"] .dropdown-menu a:hover,
:root[data-theme="dark"] .dropdown-menu a.active {
    background: var(--nav-primary-hover);
    color: var(--nav-primary-dark);
}

:root[data-theme="dark"] .mobile-menu-button,
:root[data-theme="dark"] .theme-toggle-button {
    background: #2f7d32;
}

:root[data-theme="dark"] .mobile-menu-button:hover,
:root[data-theme="dark"] .theme-toggle-button:hover {
    background: #3f9442;
}

:root[data-theme="dark"] .site-nav {
    background: transparent;
}

@media screen and (max-width: 980px) {
    :root[data-theme="dark"] .dropdown-menu {
        background: #122617;
    }
}