/* NAV — fixed top bar, spanning the full screen width like the sections
   below it.
   -------------------------------------------------------------------------- */
#topbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    width: 100%;
    z-index: 100;
    background: var(--ink);
}

#nav {
    position: relative;
    height: var(--h-nav);
    display: flex;
    align-items: center;
    gap: 40px;
}

.logo {
    display: flex;
    align-items: center;
}

    .logo img {
        width: var(--logo-w);
        height: auto;
    }

#nav-accent,
.accent-tab {
    width: var(--accent-w);
    height: 7px;
    background: var(--orange);
    clip-path: polygon(0 0, 100% 0, calc(100% - 8px) 100%, 8px 100%);
    pointer-events: none;
}

/* Small accent tab under the header — centered under the logo by default;
   JS slides it (via `left`) to screen-center while the mobile menu is open. */
#nav-accent {
    position: fixed;
    top: var(--h-nav);
    transition: left .3s ease;
    z-index: 101;
}

#nav-panel {
    display: contents;
}

#nav ul {
    display: flex;
    width: 720px;
    gap: 40px;
    list-style: none;
    margin: auto;
    padding: 0;
    font-size: 15px;
    text-transform: uppercase;
    letter-spacing: .08em;
}

    #nav ul a {
        position: relative;
        color: #fff; /* text stays white in every state */
        padding: 6px 0;
    }

        #nav ul a::after {
            content: "";
            position: absolute;
            left: 0;
            right: 0;
            bottom: -4px;
            height: 3px;
            background: var(--orange);
            transform: scaleX(0);
            transform-origin: left;
            transition: transform .18s;
        }

        #nav ul a:hover::after,
        #nav ul a.active::after {
            transform: scaleX(1);
        }

.nav-social {
    padding-top: 40px;
    display: none;
}

.nav-phone,
.callback-btn {
    justify-content: center;
    width: var(--phone-btn-w);
    height: 35px;
    padding: 0 14px;
    font-size: 15px;
    color: var(--ink);
    font-weight: 600;
}

.burger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: var(--burger-w);
    height: 36px;
    padding: 0;
    border: none;
    background: transparent;
    cursor: pointer;
    flex: none;
}

    .burger span {
        display: block;
        height: 2px;
        background: var(--orange);
        border-radius: 2px;
        transition: transform .18s, opacity .18s;
    }

    .burger[aria-expanded="true"] span:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }

    .burger[aria-expanded="true"] span:nth-child(2) {
        opacity: 0;
    }

    .burger[aria-expanded="true"] span:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }

/* Below 1280px: nav links + social icons collapse into the burger menu;
   header keeps only the logo, phone number and burger button. The panel
   stays in the layout (not display:none) so opening/closing can animate. */
@media (max-width: 1279px) {
    :root {
        --phone-right: calc(var(--nav-pad-narrow) + var(--burger-w) + var(--nav-gap-narrow));
        --phone-btn-w: min(210px, calc(100vw - var(--nav-pad-narrow) * 2 - var(--logo-w) - var(--burger-w) - var(--nav-gap-narrow) * 2));
    }

    #nav {
        padding-inline: var(--nav-pad-narrow);
        gap: var(--nav-gap-narrow);
    }

    #nav-panel {
        display: flex;
        flex-direction: column;
        align-items: center;
        position: fixed;
        top: var(--h-nav);
        left: 0;
        right: 0;
        bottom: 0;
        opacity: 0;
        overflow-y: auto;
        pointer-events: none;
        background: #0d0d0d;
        transition: opacity .25s ease;
    }

        #nav-panel.open {
            opacity: 1;
            pointer-events: auto;
        }

    #nav ul {
        width: 100%;
        flex-direction: column;
        gap: 0;
        margin: 0;
        padding: 8px 0;
    }

        #nav ul li {
            width: 100%;
            text-align: center;
        }

        #nav ul a {
            display: inline-block;
            padding: 14px 0;
        }

    .nav-social {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 20px;
        width: 240px;
        position: fixed;
        top: 360px;
        left: 0;
        right: 0;
        margin: 0 auto;
    }

        .nav-social a {
            width: 32px;
            height: 32px;
            margin: 0 auto;
        }

        .nav-social img {
            width: 100%;
            height: 100%;
        }

        /* Links and icons fly out toward the burger button (top-right corner)
       and shrink away; the panel's overflow:hidden clips them as they reach
       the edge, reinforcing that they vanish into the burger. */
        #nav-panel li,
        .nav-social a {
            opacity: 0;
            transform-origin: top right;
            transform: translate(180px, -130px) scale(.15);
            transition: opacity .22s ease, transform .3s ease;
        }

    #nav-panel.open li,
    #nav-panel.open .nav-social a {
        opacity: 1;
        transform: translate(0, 0) scale(1);
    }

        #nav-panel.open li:nth-child(1) {
            transition-delay: .04s;
        }

        #nav-panel.open li:nth-child(2) {
            transition-delay: .08s;
        }

        #nav-panel.open li:nth-child(3) {
            transition-delay: .12s;
        }

        #nav-panel.open li:nth-child(4) {
            transition-delay: .16s;
        }

        #nav-panel.open li:nth-child(5) {
            transition-delay: .20s;
        }

        #nav-panel.open li:nth-child(6) {
            transition-delay: .24s;
        }

        #nav-panel.open .nav-social a:nth-child(1) {
            transition-delay: .22s;
        }

        #nav-panel.open .nav-social a:nth-child(2) {
            transition-delay: .25s;
        }

        #nav-panel.open .nav-social a:nth-child(3) {
            transition-delay: .28s;
        }

        #nav-panel.open .nav-social a:nth-child(4) {
            transition-delay: .31s;
        }

        #nav-panel.open .nav-social a:nth-child(5) {
            transition-delay: .34s;
        }

        #nav-panel.open .nav-social a:nth-child(6) {
            transition-delay: .37s;
        }

        #nav-panel.open .nav-social a:nth-child(7) {
            transition-delay: .40s;
        }

        #nav-panel.open .nav-social a:nth-child(8) {
            transition-delay: .43s;
        }

    .logo,
    .nav-phone {
        flex: none;
    }

    .nav-phone {
        margin-left: auto;
    }

    .burger {
        display: flex;
    }
}

@media (max-width: 479px) {
    :root {
        --nav-pad-narrow: 14px;
        --nav-gap-narrow: 10px;
        --logo-w: clamp(100px, 34vw, 140px);
    }

    .nav-phone,
    .callback-btn {
        padding: 0 10px;
        font-size: clamp(11px, 3.2vw, 13px);
    }
}