body, header.masthead .masthead-heading, header.masthead .masthead-subheading,
#mainNav .navbar-nav .nav-item .nav-link,
h1, h2, h3, h4, h5, h6, .h1, .h2, .h3, .h4, .h5, .h6,
.btn-xl {
    font-family: Arial, "文泉驛正黑", "WenQuanYi Zen Hei", "儷黑 Pro", "LiHei Pro", "微軟正黑體", "Microsoft JhengHei", "新細明體", PMingLiU, sans-serif;
}
.btn-primary,
.btn-primary:focus {
    color: #fff;
    background-color: #00ccff;
    border-color: #00ccff;
}
/*.btn-primary:hover {
    background-color: #2ad4ff;
    border-color: #2ad4ff;
}*/
#mainNav, 
#mainNav.navbar-shrink {
    padding-top: 0.5rem;
    padding-bottom: 0.5rem;
    background-color: rgba(0,170,212,0.8);
}
#mainNav .navbar-brand img, 
#mainNav.navbar-shrink .navbar-brand svg, 
#mainNav.navbar-shrink .navbar-brand img {
    height: 3rem;
}

header.masthead {
    height: 100vh;
    padding: 0;
    background: linear-gradient(to bottom, rgba(60, 60, 60, 0.8) 0%, rgba(33, 33, 33, 0.8) 100%), url('../images/bg.masthead.jpg');
    background-position: center;
    background-size: cover;
}
header.masthead .container {
    padding-top: 10.5rem;
    padding-bottom: 6rem;
}

.page-section {
    text-align: center;
}
.page-section h2 {
    color: #00aad4;
    font-size: 2.5rem;
}
.page-section p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
}
.page-section hr.divider {
    max-width: 3.25rem;
    border-width: 0.2rem;
    border-color: #00aad4;
    margin-bottom: 2rem;
}
.page-section i {
    margin-bottom: 1rem;
}
.page-section#contact {
    background-color: #f8f9fa;
}

/*header.masthead .masthead-subheading {
    font-family: "Montserrat", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";;
}*/
@media (min-width: 768px) {
    header.masthead .masthead-subheading {
        font-style: normal;
    }
}
@media (min-width: 992px) {
    #mainNav {
        background: transparent;
    }
    #mainNav, 
    #mainNav.navbar-shrink {
        padding-top: 0.5rem;
        padding-bottom: 0.5rem;
        /*background-color: rgba(0,170,212,0.8);*/
    }
    #mainNav.navbar-shrink {
        background-color: rgb(0,170,212);
    }
    #mainNav .navbar-brand img {
        transition: height 0.3s ease-in-out;
    }
}