.site-header{background:#0b3c5d;color:#fff;padding:12px 0}.container{margin:auto;max-width:1200px;padding:0 16px}.header-content{align-items:center;display:flex;justify-content:space-between}.logo a{color:#fff;font-size:22px;font-weight:700;text-decoration:none}.logo span{color:#f9a825}.main-nav ul{display:flex;gap:20px;list-style:none}.main-nav a{color:#fff;font-weight:500;text-decoration:none}.main-nav a:hover{text-decoration:underline}.auth-buttons{display:flex;gap:10px}.btn{border-radius:4px;font-size:14px;padding:8px 14px;text-decoration:none}.btn.login{background:transparent;border:1px solid #fff;color:#fff}.btn.register{background:#f9a825;color:#000;font-weight:700}.burger{cursor:pointer;font-size:22px}.burger,.mobile-auth{display:none}.auth-actions{display:flex;gap:10px}.btn-auth{border-radius:6px;font-weight:600;padding:8px 14px;text-decoration:none;white-space:nowrap}.btn-login{border:1px solid #fff;color:#fff}.btn-register{background:#4caf50;color:#fff}.btn-logout{background:#e53935;color:#fff}@media (max-width:768px){.auth-actions{display:none}.mobile-auth{display:block}}@media (min-width:769px){.mobile-auth{display:none}}@media (max-width:900px){.main-nav{background:#0b3c5d;display:none;flex-direction:column;left:0;position:absolute;top:64px;width:100%}.main-nav.active{display:block}.main-nav ul{flex-direction:column;padding:10px 0}.main-nav li{padding:12px;text-align:center}.auth-buttons{display:none}.burger,.mobile-auth{display:block}}