body {
    font-family: Arial, Helvetica, sans-serif;
    background: #f5f7fa;
}

:root {
    --bs-body-font-family: Arial, Helvetica, sans-serif;
}

/* nav 配色 */
.navbar-dark-custom {
    background-color: #1e2a3a;
    border-bottom: 1px solid #162030;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25);
}

    .navbar-dark-custom .navbar-brand {
        color: #ffffff;
        font-weight: 600;
    }

        .navbar-dark-custom .navbar-brand:hover {
            color: #e8edf2;
        }

    .navbar-dark-custom .nav-link {
        color: #c8d3e0 !important;
        transition: color 0.2s ease;
    }

        .navbar-dark-custom .nav-link:hover {
            color: #ffffff !important;
        }

        .navbar-dark-custom .nav-link.active {
            color: #4a9eff;
            font-weight: 500;
        }

    .navbar-dark-custom .navbar-toggler {
        border-color: rgba(255, 255, 255, 0.2);
    }

    .navbar-dark-custom .navbar-toggler-icon {
        background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba%28255,255,255,0.7%29' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }


#goTop {
    width: 50px;
    height: 50px;
    color: #fff;
    background-color: #1a6fd4;
    transition: all 0.5s;
    line-height: 50px;
    box-shadow: 0 2px 5px 0 rgba(0,0,0,0.16), 0 2px 10px 0 rgba(0,0,0,0.12);
}

    #goTop:hover {
        background-color: #1558b0;
    }