/* ===========================
   HEADER
=========================== */

:root{
    --primary:#0f172a;
    --secondary:#1e40af;
    --accent:#2563eb;
    --background:#ffffff;
    --light:#f8fafc;
    --border:#e2e8f0;
    --text:#1e293b;
    --muted:#64748b;
}

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

body{
    font-family:Inter,Segoe UI,Roboto,sans-serif;
    color:var(--text);
    background:var(--light);
}

.site-header{
    background:#fff;
    box-shadow:0 8px 24px rgba(0,0,0,.05);
    z-index:1000;
}

.header-top{
    max-width:1400px;
    margin:auto;
    padding:18px 35px;

    display:flex;
    justify-content:space-between;
    align-items:center;
}

.header-logo{
    flex:1;
}

.header-logo img{
    width:60px;
    height:60px;
    object-fit:contain;
}

.header-brand{
    flex:2;
    text-align:center;
}

.header-brand h1{
    font-size:2rem;
    font-weight:800;
    letter-spacing:-.5px;
}

.header-brand h1 a{
    text-decoration:none;
    color:var(--primary);
}

.header-brand p{
    margin-top:6px;
    color:var(--muted);
    font-size:.95rem;
}

.header-actions{
    flex:1;
    display:flex;
    justify-content:flex-end;
    gap:12px;
}

.header-actions a{
    text-decoration:none;
    padding:11px 22px;
    border-radius:10px;
    font-weight:600;
    transition:.3s;
}

.btn-login{
    border:2px solid var(--accent);
    color:var(--accent);
}

.btn-login:hover{
    background:var(--accent);
    color:#fff;
}

.btn-register{
    background:var(--accent);
    color:#fff;
}

.btn-register:hover{
    background:var(--secondary);
}

/* ===========================
   CATEGORY BAR
=========================== */

.main-navigation{
    background:var(--primary);
    position: sticky;
    top: 0;
    z-index: 999;
    box-shadow: 0 4px 12px rgba(0,0,0,.08);
}

.main-navigation ul{
    max-width:1400px;
    margin:auto;

    display:flex;
    justify-content:center;
    list-style:none;
}

.main-navigation ul::-webkit-scrollbar{
    display: none;
}

.main-navigation li{
    position:relative;
}

.main-navigation a{
    display:block;
    color:#fff;
    text-decoration:none;
    padding:16px 28px;
    font-weight:600;
    transition:.3s;
}

.main-navigation a:hover{
    background:var(--accent);
}

/* ===========================
   RESPONSIVE
=========================== */

@media(max-width:900px){

    .header-top{
        flex-direction:column;
        gap:18px;
        text-align:center;
    }

    .header-actions{
        justify-content:center;
    }

    .main-navigation ul{
        overflow-x:auto;
        justify-content:flex-start;
    }

    .main-navigation a{
        white-space:nowrap;
    }

}