:root {
    --header-height: 220px;
    --nav-width: 250px;
    --frame-padding: 25px;
    --title-color: #722;
    --background-contrast-color: #800;
}

* {
    box-sizing: border-box;
}

img {
    max-width: 100%;
}

body {
    min-height: 100dvh;
    margin: 0;
    background-image: url("../media/img/background.png");
    background-repeat: repeat;
    background-position: center;
    background-attachment: fixed;
}

.main__page {
    min-height: 100vh;
    padding: 50px;
    background-image: linear-gradient(#000, transparent, transparent, #000);
    display: grid;
    grid-template-columns: 1fr;
}

.container {
    width: 100%;
    max-width: 1400px;
    margin: auto;
}

.main__content {
    background-color: #fff;
    border-style: solid none;
    border-image: linear-gradient(to right, #fc0, #da0) 1;
    border-width: 7px;
    display: grid;
    grid-template-columns: var(--nav-width) auto;
    grid-template-rows: var(--header-height) auto;
}

.main__nav-right {
    flex-grow: 1;
    flex-basis: 0;
    display: flex;
    flex-direction: column;
}

header {
    box-sizing: content-box;
    position: relative;
    z-index: 0;
    height: var(--header-height);
    border: 2px solid black;
    background-image: url("../media/img/piano.jpg");
    background-size: cover;
    display: flex;
}

.main__header--gradient {
    background-image: linear-gradient(to right, transparent, #281E2A);
    width: 100%;
    height: 100%;
}

.main__header-image {
    aspect-ratio: 1;
    height: var(--header-height);
    background-image: url("../media/img/ana_fau_5.png");
    background-size: cover;
}

.main__header-image--gradient {
    width: 100%;
    height: 100%;
    background-image: linear-gradient(to left, transparent, transparent, transparent, #281E2A);
}

#frame-contents {
    width: 100%;
    flex-grow: 1;
    flex-basis: 0;
}

.frame-contents__body {
    height: 100%;
}

.frame-contents__body, .frame-contents__body p {
    font-family: Arial, Helvetica, sans-serif;
}

.colored-title {
    color: var(--title-color);
}

h2 {
    margin: 0;
    font-family: sans-serif;
    font-size: 2rem;
    text-align: center;
    text-shadow: 0 0 5px #C44;
}

.button-style {
    padding: 10px 20px;
    font-size: 1.1em;
    font-weight: bold;
    color: #fff;
    background-color: var(--background-contrast-color);
    border: 6px outset var(--background-contrast-color);
    border-radius: 10px;
    box-shadow: 2px 2px 5px var(--background-contrast-color);
    user-select: none;
}

.button-style:active {
    border-style: inset;
}

@media (max-width: 700px) {
    .main__content {
        display: flex;
        flex-direction: column;
    }
}