html {
    margin: 0;
    padding: 0;
    scroll-behavior: smooth;
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Open Sans', Arial, sans-serif;
    font-size: 17px;
    color: #555;
}

h1, h2, h3, h4 {
    font-weight: normal;
    color: #667;
}

/* common */
nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
}

nav ul li {
    list-style: none;
    margin: 0 20px;
}

nav ul li a {
    display: inline-block;
    padding: 10px 20px;
    font-weight: bold;
    color: #777;
    text-decoration: none;
    white-space: nowrap;
}
nav ul li a:hover {
    color: #c72;
}
nav ul li a.active {
    color: #c72;
}

section {
    position: relative;
    width: 65%;
    padding-top: 80px;
    padding-left: 25%;
    margin-bottom: 140px;
}

section h2 {
    margin-top: 0;
    margin-bottom: 1em;
    font-size: 30px;
    line-height: 30px;
}

section article {
    padding: 30px;
    width: 80%;
    max-width: 800px;
    background: #fff;
    border: 1px solid #ddd;
}

section article p {
    margin-left: 20px;
}

address i {
    font-style: normal;
}

/* misc */
.center {
    text-align: center;
}

.right {
    text-align: right;
}

.icon {
    height: 25px;
    width: 25px;
    margin-left: 10px;
    vertical-align: top;
}

/* header */
header {
    display: flex;
    position: -webkit-sticky;
    position: sticky;
    width: 90%;
    height: 83px;
    top: -40px;
    z-index: 3;
    background: #fff;
}

header .logo {
    display: block;
    margin: 0;
    padding-top: 40px;
    width: 27.8%;
    text-align: right;
}
header .logo img {
    width: 300px;
}

header nav {
    width: 72.2%;
    border-bottom: 1px solid #ddd;
}

header nav ul {
    padding: 40px 0 0;
}

/* splash */
#splash {
    width: 90%;
    padding-top: 300px;
    padding-left: 0;
    margin-bottom: 200px;
}

#splash:before {
    position: absolute;
    top: 50px;
    left: 0;
    z-index: -1;
    display: block;
    content: ' ';
    width: 100%;
    height: 450px;
    background-image: url(images/sky.jpg);
    background-position: 0 center;
    background-repeat: no-repeat;
    background-size: cover;
    border-bottom: 20px solid #4b6079;
}

#splash > div {
    padding: 20px 30px 30px;
    width: 50%;
    margin-left: 50%;
    margin-bottom: 100px;
    max-width: 445px;
    background: #f7f7f7;
    border: 1px solid #ccc;
}

#splash > div p {
    margin-left: 20px;
}

/* technical papers */
#technical_papers:before {
    position: absolute;
    top: 40px;
    left: 0;
    z-index: -1;
    display: block;
    content: ' ';
    width: 100%;
    height: 150px;
    background: #c5c2be;
}

/* papers */
#papers {
    list-style: none;
    margin: 0;
    padding-left: 20px;
}

#papers > li {
    list-style: none;
    background: #fff;
}

/* contact */
#contact:before {
    position: absolute;
    top: 40px;
    left: 0;
    z-index: -1;
    display: block;
    content: ' ';
    width: 100%;
    height: 150px;
    background-image: url(images/sky2.jpg);
    background-position: 0 bottom;
    background-repeat: no-repeat;
    background-size: cover;
    border-bottom: 20px solid #7f8a97;
}

/* privacy */
#privacy:before {
    position: absolute;
    top: 40px;
    left: 0;
    z-index: -1;
    display: block;
    content: ' ';
    width: 100%;
    height: 150px;
    background-image: url(images/sky2.jpg);
    background-position: 0 bottom;
    background-repeat: no-repeat;
    background-size: cover;
    border-bottom: 20px solid #7f8a97;
}

/*#privacy > div {
    padding: 30px;
    width: 80%;
    max-width: 800px;
    background: #fff;
    border: 1px solid #ddd;
}
*/
/* footer */
footer {
    width: 65%;
    padding-left: 25%;
    margin-bottom: 400px;
    border-top: 1px solid #ddd;
}