/* ---------- Variables ---------- */
:root {
    --nav-height: 40px;
    --nav-bg: #36a3f7;       /* nav bar background */
    --nav-border: #ccc;
    --nav-text: #fff;         /* top-level text color */
    --nav-stxt: #fff;         /* submenu text color */
    --nav-hover: #fff;         /* hover color for top-level items */
    --submenu-bg: #f2f2f2;    /* light grey submenu background */
    --submenu-hover: #e0e0e0; /* lighter hover */
}

/* ---------- Reset ---------- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* ---------- Mobile First Navigation ---------- */
nav {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    z-index: 20;
    background: rgba(0, 0, 0, 0.5); /* transparent overlay */
    backdrop-filter: blur(6px);     /* optional */
}

/* Hamburger menu (mobile) */
.hamburger {
    display: flex;                  /* show on mobile */
    margin: 0 auto;
    background: none;
    border: none;
    font-size: 15px;
    padding: 10px;
    cursor: pointer;
    align-items: center;
    gap: 5px;
    color: #fff;
}

.hamburger span {
    font-size: 16px;
    font-weight: 500;
}

/* Menu container (mobile hidden by default) */
.menu {
    display: none;
    flex-direction: column;
    align-items: center;
    width: 100%;
    list-style: none;
}

/* Menu visible when nav is open */
.nav.open .menu {
    display: flex;
}

.menu > li {
    width: 100%;
    text-align: center;
    position: relative; /* for submenu positioning */
}

.menu > li > a {
    display: block;
    padding: 12px 0;
    text-decoration: none;
    color: var(--nav-text);
    font-weight: 500;
    line-height: 1.2;
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
}

/* Top-level hover effect */
.menu > li > a:hover {
    background: rgba(0,0,0,0.7);
}

/* ---------- Submenu Mobile ---------- */
.submenu {
    display: none; /* hidden by default */
    width: 100%;
    text-align: center;
    list-style: none;
}

.menu > li.open > .submenu {
    display: block;
}

.submenu li a {
    display: block;
    padding: 10px 0;
    color: var(--nav-stxt);
    background: rgba(0,0,0,0.5);
}

.submenu li a:hover {
    background: rgba(0,0,0,0.7);
    color: var(--nav-hover);
}

/* ---------- Tablet & Up (≥ 768px) ---------- */
@media (min-width: 768px) {
    .hamburger {
        display: none; /* hide hamburger on larger screens */
    }

    .menu {
        display: flex;
        flex-direction: row;
        justify-content: center;
        width: auto;
    }

    .menu > li {
        width: auto;
        text-align: left;
    }

    .menu > li > a {
        padding: 8px 12px;
    }

    /* Show submenu on hover for parent li */
    .menu > li:hover > .submenu {
        display: block;
    }


    /* Submenu for tablet/desktop */
    .submenu {
        position: absolute;
        top: 100%;
        left: 50%;
        transform: translateX(-50%);
        min-width: 220px;
        box-shadow: 0 2px 6px rgba(0,0,0,0.5);
        background-color: rgba(0, 0, 0, 0.5);        
        z-index: 2000;
    }

    .submenu li a {
        padding: 10px 14px;
    }

    /* Show submenu on hover for larger screens */
    @media (min-width: 1025px) {
        .menu > li:hover > .submenu {
            display: block;
        }
    }
}

/* ---------- Sticky nav support ---------- */
.nav.sticky {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
}

body.nav-stuck {
    padding-top: var(--nav-height);
}

.no-link {
    color: rgba(255, 255, 255, 0.45);  /* greyed out */
    cursor: default;
    pointer-events: none;             /* prevents clicking */
    text-decoration: none;
    opacity: 0.6;                     /* optional extra fade */
}

.submenu a.no-link {
    color: rgba(255, 255, 255, 0.45);
    pointer-events: none;
    cursor: default;
    opacity: 0.6;
}

.menu > li > a.no-link {
    color: rgba(255, 255, 255, 0.65);
    cursor: default;
}