/* GENERAL LAYOUT --------------------------------------------------- */
html, body {
    height: 100%;
    margin: 0;
}
body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    padding-top: 100px;   /* header height */
}
main {
    flex: 1;
}

/* HEADER ------------------------------------------------------------*/
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 80px;
    background-color: #000066;
    color: white;
    z-index: 1000;
    padding: 10px 0;
}

/* FOOTER ------------------------------------------------------------*/
footer {
    background-color: #8EB8C9;
}

/* HORIZONTAL SCROLL ADS ---------------------------------------------*/
.horizontal-scroll {
    width: 100%;
    overflow: hidden;
    white-space: nowrap;
    position: relative;
}
.horizontal-scroll-track {
    display: inline-flex;
    animation: scroll-loop 25s linear infinite;
}
@keyframes scroll-loop {
    from { transform: translateX(0); }
    to { transform: translateX(-50%); }
}
.ad-item {
    flex: 0 0 auto;
    margin: 0 10px;
}
.ad-item img {
    max-height: 100px;
    width: auto;
}