:root{ --header-h:64px; }

/* Header sticky */
.site-header{
    position:sticky; top:0;
    backdrop-filter:blur(10px);
    background:rgba(10,10,18,.6);
    border-bottom:1px solid rgba(255,255,255,.15);
    z-index:3000;
}
.site-nav{
    max-width:1200px; margin:auto;
    display:flex; justify-content:space-between; align-items:center;
    height:var(--header-h);
}

/* Brand */
.site-nav .brand{
    font-family:'ZabalDEMOBlack',system-ui,sans-serif;
    font-size:1.3rem; color:#fff; text-decoration:none;
    text-transform:uppercase; letter-spacing:1px;
}

/* Burger (sans bordure) */
.nav-burger{
    display:none;
    position:relative; width:42px; height:42px;
    background:transparent; border:none; cursor:pointer;z-index:3100;
}
.nav-burger span{
    position:absolute; left:10px; right:10px; height:2px;
    background:#fff; border-radius:2px;
    transition:transform .25s ease, opacity .2s ease, top .25s ease;
}
.nav-burger span:nth-child(1){ top:12px; }
.nav-burger span:nth-child(2){ top:20px; }
.nav-burger span:nth-child(3){ top:28px; }
.nav-burger[aria-expanded="true"] span:nth-child(1){ top:20px; transform:rotate(45deg); }
.nav-burger[aria-expanded="true"] span:nth-child(2){ opacity:0; }
.nav-burger[aria-expanded="true"] span:nth-child(3){ top:20px; transform:rotate(-45deg); }

/* Liens desktop */
.nav-links{
    display:flex; gap:18px; list-style:none; padding:0; margin:0;
}
.nav-links a{
    font-family:'ZabalDEMOBlack',system-ui,sans-serif;
    font-size:1rem; color:#fff; text-transform:uppercase; text-decoration:none;
    opacity:.9; padding:0 8px; border-radius:10px;
}
.nav-links a:hover,.nav-links a.active{
    background:rgba(255,255,255,.15); opacity:1; padding:5px 10px;
}

/* Bloque le scroll quand le menu est ouvert */
body.no-scroll{ overflow:hidden; }

/* ---------- Mobile / Tablet ---------- */
@media (max-width:900px){
    .nav-burger{ display:block; }

    /* caché par défaut */
    .nav-links{ display:none; }

    /* panneau ouvert plein écran */
    .nav-links.is-open{
        display:block;
        position:fixed;
        top:0; left:0; right:0; bottom:0;
        height:100dvh;
        overflow-y:auto;
        padding: calc(var(--header-h) + 12px) 18px 18px;

        background:
                radial-gradient(80% 60% at 100% 0%, rgba(106,17,203,.28), transparent 60%),
                radial-gradient(70% 70% at 0% 100%, rgba(37,117,252,.22), transparent 65%),
                rgba(10,10,18,.96);

        border-left:1px solid rgba(255,255,255,.12);
        box-shadow:-12px 0 40px rgba(0,0,0,.4);

        z-index:2010; /* au-dessus de tout */
    }

    .nav-links li{ margin:8px 0; }
    .nav-links a{
        display:block; padding:12px 14px;
        border:1px solid rgba(255,255,255,.15);
        border-radius:12px; background:rgba(255,255,255,.06);
    }
    .nav-links a:hover,.nav-links a.active{
        background:rgba(255,255,255,.12);
    }

    /* overlay */
    .nav-overlay{
        position:fixed; inset:0;
        background:rgba(0,0,0,.48);
        backdrop-filter: blur(2px);
        display:none;
        z-index:2005;
    }
    .nav-overlay.show{ display:block; }
}

/* Petits téléphones */
@media (max-width:520px){.nav-links.is-open{ left:0; }}
@media (max-width: 767px) {.brand {margin-left: 12px;}}
@media (min-width: 901px) {.nav-links .mobile-only {display: none !important;}}

.hero-wrapper{
    position: relative;
    margin-top: calc(-1 * var(--header-h));
    z-index: 1;
}

.hero-background{
    width:100%;
    height:auto;
    display:block;
}