body {
    font-family: sans-serif;
    margin: 0;
    padding: 0;
}

h1, h2 {
    padding: 0;
    margin: 0;
}

.scrollview {
    width: 100%;
    height: auto;
}

.scrollview .section {
    height: 100vh;
    width: 100%;
    position: relative;
}

.scrollview .section::after {
    position: absolute;
    content: '';
    background: #0000007d;
    z-index: 2;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    opacity: .8;
    transition: opacity .2s ease;
}

.scrollview .section .center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 9;
    color: white;
}

/* Reveal básico (transición controlada por JS) */
.a-top.hidden {
    opacity: 0;
    margin-top: 5em;
}
.a-top {
    opacity: 1;
    margin-top: 0;
    transition: opacity .5s ease-in, margin-top .3s ease-out;
}
.footer {
    text-align: center;
}

.footer span {
    display: block;
    padding: 100px;
}

header.header {
    position: fixed;
    z-index: 999;
    left: 0;
    right: 0;
    top: 0;
}

.navigation {
    float: right;
    padding: 24px;
}

.navigation ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.navigation ul li {
    display: inline-block;
}

.navigation ul li a {
    color: white;
    text-decoration: none;
    display: inline-block;
    padding: 2px;
    transition: all 0.1s ease;
}

.navigation ul li.active a {
    opacity: .7;
}