.site-nav {
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 1000;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
}

.nav-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 2.75rem;
    height: 2.75rem;
    padding: 0.65rem;
    background: #151e2f;
    border: 1px solid #2a3650;
    border-radius: 0.75rem;
    cursor: pointer;
}

.nav-toggle-bar {
    display: block;
    width: 100%;
    height: 2px;
    background: #c7d9ff;
    border-radius: 1px;
    transition: transform 0.25s ease, opacity 0.25s ease;
}

.site-nav.open .nav-toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.site-nav.open .nav-toggle-bar:nth-child(2) {
    opacity: 0;
}

.site-nav.open .nav-toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

.nav-menu {
    list-style: none;
    display: none;
    flex-direction: column;
    gap: 0.25rem;
    margin-top: 0.75rem;
    min-width: 220px;
    padding: 0.5rem;
    background: #151e2f;
    border: 1px solid #2a3650;
    border-radius: 0.75rem;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
}

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

.nav-section {
    margin: 0;
    padding: 0.6rem 0.85rem 0.25rem;
    color: #ffffff;
    font-size: 1rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;

    background-color: #7a8db0aa;
    border-radius: 20px;
}

.nav-section:first-child {
    padding-top: 0.25rem;
}

.nav-link {
    display: block;
    padding: 0.5rem 0.85rem;
    border-radius: 0.5rem;
    color: #b8c9f0;
    text-decoration: none;
    font-size: 0.95rem;
    transition: background 0.15s ease, color 0.15s ease;
}

.nav-link:hover {
    background: #1e2a3f;
    color: #e0e4f0;
}

.nav-link[aria-current="page"] {
    background: #2d3b5a;
    color: #ffffff;
}

@media (min-width: 900px) {
    body {
        padding-left: 15rem;
    }

    .site-nav {
        top: 0;
        left: 0;
        display: flex;
        flex-direction: column;
        height: 100vh;
        padding: 1rem;
        background: #111627;
        border-right: 1px solid #2a3650;
    }

    .nav-toggle {
        display: none;
    }

    .nav-menu {
        display: flex;
        margin-top: 0;
        padding: 0;
        min-width: 0;
        width: 200px;
        background: transparent;
        border: none;
        box-shadow: none;
    }

    .nav-section:first-child {
        padding-top: 0.6rem;
    }

    .nav-link {
        font-size: 1rem;
    }
}