/* ========================= */
/* NAVIGATION SYSTEM         */
/* ========================= */

/* 🎯 THE TOGGLE BUTTON (Mobile/Tablet Only) */
.nav-toggle {
    position: fixed;
    top: 25px;
    right: 25px;
    width: 50px;
    height: 50px;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    z-index: 1001;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-fast);
}

.nav-toggle:hover {
    border-color: var(--primary);
    box-shadow: var(--glow-soft);
}

.hamburger {
    width: 24px;
    height: 2px;
    background: var(--primary);
    position: relative;
    transition: background 0.3s;
}

.hamburger::before,
.hamburger::after {
    content: "";
    position: absolute;
    width: 24px;
    height: 2px;
    background: var(--primary);
    left: 0;
    transition: transform 0.3s;
}

.hamburger::before { top: -8px; }
.hamburger::after { top: 8px; }

/* HAMBURGER ANIMATION WHEN OPEN */
.nav-toggle.open .hamburger { background: transparent; }
.nav-toggle.open .hamburger::before { transform: rotate(45deg) translate(5px, 6px); }
.nav-toggle.open .hamburger::after { transform: rotate(-45deg) translate(5px, -6px); }

/* 🎯 MOBILE/TABLET NAV BASE (Full screen overlay) */
.side-nav {
    position: fixed;
    inset: 0;
    background: rgba(15, 15, 15, 0.98);
    backdrop-filter: blur(15px);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2.5rem;
    opacity: 0;
    visibility: hidden;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.side-nav.open {
    opacity: 1;
    visibility: visible;
}

.side-link {
    text-decoration: none;
    font-family: var(--font-heading);
    font-size: 2rem;
    color: var(--text-main);
    text-transform: uppercase;
    letter-spacing: 4px;
    transition: var(--transition-fast);
}

.side-link:hover {
    color: var(--primary);
    text-shadow: var(--glow-soft);
    transform: scale(1.05);
}

/* Hide the animated line span on mobile */
.side-link span {
    display: none;
}

/* 📱 MOBILE ADJUSTMENTS */
@media (max-width: 768px) {
    .nav-toggle {
        top: 20px;
        right: 20px;
        width: 45px;
        height: 45px;
    }
    
    .side-link {
        font-size: 1.5rem;
    }
}

/* ======================================= */
/* 🎯 DESKTOP HYBRID NAV (Screen > 1100px) */
/* ======================================= */
@media (min-width: 1101px) {
    /* Hide the mobile toggle button entirely */
    .nav-toggle { display: none; }

    /* Reformat side-nav to be top-right horizontal menu */
    .side-nav {
        inset: auto;
        top: 40px;
        right: 50px;
        background: transparent;
        backdrop-filter: none;
        width: auto;
        height: auto;
        flex-direction: row; 
        align-items: center;
        gap: 40px;
        /* Starts hidden on the main hero page */
        visibility: hidden; 
        opacity: 0;
        transition: opacity 0.4s ease, visibility 0.4s ease;
    }

    /* Shown dynamically via JS when scrolling down */
    .side-nav.visible {
        visibility: visible;
        opacity: 1;
    }

    .side-link {
        font-size: 0.75rem;
        display: flex;
        flex-direction: column; 
        align-items: center;
        gap: 6px;
        color: var(--text-muted); /* Greyish text */
        letter-spacing: 2px;
    }

    .side-link:hover {
        transform: none; /* Disables the mobile scale effect */
    }

    .side-link span {
        display: block; /* Turn underline back on for desktop */
        width: 0; 
        height: 2px;
        background: var(--primary);
        transition: width 0.3s ease;
        box-shadow: none;
    }

    .side-link.active { color: var(--primary); }
    
    .side-link.active span { 
        width: 100%; 
        box-shadow: var(--glow-soft); 
    }
    
    .side-link label { cursor: pointer; }
}