.top-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 60px;
    top: 0;
    z-index: 999;
}


.top-nav-title {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 4px;
}

.top-nav-title a {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.top-nav-title img {
    height: 60px;
    width: auto;
    display: block;
}


.nav-center {
    flex: 1;
    text-align: center;
}

.nav-center a {
    font-size: 16px;
    font-weight: bold;
    color: dimgray;
    text-decoration: none;
    margin: 0 20px;
    letter-spacing: 0.5px;
    transition: color 0.3s ease;
}

.nav-center a:hover {
    color: #cc9900;
}


html, body {
    height: 100%;
    margin: 0;
}

body {
    display: flex;
    flex-direction: column;
}

.footer {
    margin-top: auto;
}

/* suitable for mobile */
@media (max-width: 768px) {
    .top-nav {
        flex-direction: column;
        align-items: flex-start;
        padding: 15px 20px;
    }

    .nav-center {
        text-align: left;
        width: 100%;
        margin-top: 10px;
    }

    .nav-center a {
        display: block;
        margin: 8px 0;
    }

    .login-box {
        width: 100%;
        justify-content: flex-start;
        margin-top: 10px;
    }
}