:root{
    --brand:#008080;
    --text:#0f172a;
    --muted:#475569;
    --border:#e2e8f0;
    --card:#ffffff;
}

/* container */
.container{
    max-width:1100px;
    margin:0 auto;
    padding:0 18px;
}

/* header base */
.nav{
    position:sticky;
    top:0;
    z-index:50;
    width:100%;
    left:0;
    right:0;
    backdrop-filter:blur(10px);
    background:rgba(248,250,252,.92);
    border-bottom:1px solid rgba(226,232,240,.7);
    overflow-x:hidden;
}

.nav-inner{
    display:grid;
    grid-template-columns:auto 1fr auto;
    align-items:center;
    gap:14px;
    padding:14px 0;
}

.nav-inner > *{
    min-width:0;
}

/* left block */
.nav-left{
    display:flex;
    align-items:center;
    gap:14px;
    min-width:0;
}

/* logo */
.logo-link{
    display:inline-flex;
    align-items:center;
    text-decoration:none;
    flex-shrink:0;
}

.site-logo{
    height:30px;
    width:auto;
    display:block;
}

/* version */
.app-version{
    color:var(--text);
    font-size:14px;
    white-space:nowrap;
    flex-shrink:0;
}

/* brand */
.brand{
    display:inline-flex;
    align-items:center;
    gap:10px;
    font-weight:900;
    text-decoration:none;
    color:var(--text);
    white-space:nowrap;
    flex-shrink:0;
}

.dot{
    width:10px;
    height:10px;
    border-radius:999px;
    background:var(--brand);
}

/* links */
.nav-links{
    display:flex;
    align-items:center;
    justify-content:center;
    color:var(--muted);
    font-weight:700;
    white-space:nowrap;
}

.nav-links a{
    text-decoration:none;
    color:inherit;
}

/* right actions */
.nav-cta{
    display:flex;
    gap:10px;
    align-items:center;
    justify-self:end;
    flex-shrink:0;
}

/* buttons */
.btn{
    height:40px;
    padding:0 16px;
    border-radius:12px;
    display:inline-flex;
    align-items:center;
    justify-content:center;
    font-weight:800;
    border:1px solid transparent;
    text-decoration:none;
    white-space:nowrap;
    font-size: 14px;
}

.btn-primary{
    background:var(--brand);
    color:#fff;
}

.btn-secondary{
    background:#ffffff;
    color:#111827;
    border:1px solid #e2e8f0;
}

.btn-secondary:hover{
    background:#f8fafc;
}

.nav-logout-form{
    margin:0;
}

.btn-outline{
    height:40px;
    padding:0 16px;
    border-radius:12px;
    display:inline-flex;
    align-items:center;
    justify-content:center;
    font-weight:800;
    border:1px solid #e2e8f0;
    background:#e55353;
    color:#ffffff;
    cursor:pointer;
    text-decoration:none;
    white-space:nowrap;
}

.btn-outline:hover{
    background:#e55366;
}

.nav-user{
    display:inline-flex;
    align-items:center;
    gap:8px;
    padding:8px 12px;
    border:1px solid var(--border);
    border-radius:999px;
    background:var(--card);
    box-shadow:0 8px 18px rgba(0,0,0,.05);
    font-size:13px;
    color:var(--muted);
    white-space:nowrap;
    flex-shrink:0;
}

/* guest */
.nav-guest .nav-links{
    gap:22px;
}

.nav-guest .nav-cta{
    gap:10px;
}

/* auth */
.nav-auth .nav-links{
    gap:16px;
}

.nav-auth .nav-cta{
    gap:10px;
}

/* medium */
@media (max-width:1100px){
    .nav-guest .nav-links{
        gap:16px;
    }

    .nav-auth .nav-links{
        gap:12px;
    }

    .btn,
    .btn-outline{
        padding:0 14px;
    }
}

/* tablet */
@media (max-width:980px){
    .nav-links,
    .nav-user,
    .app-version{
        display:none !important;
    }

    .nav-inner{
        grid-template-columns:1fr auto;
        gap:12px;
    }

    .nav-left{
        gap:12px;
    }
}

/* mobile */
@media (max-width:640px){
    .container{
        padding:0 14px;
    }

    .nav-inner{
        gap:10px;
    }

    .nav-left{
        gap:10px;
    }

    .brand{
        font-size:15px;
    }

    .btn,
    .btn-outline{
        height:38px;
        padding:0 12px;
        border-radius:10px;
        font-size:14px;
    }

    .nav-cta{
        gap:8px;
    }
}