/* vars */
:root {
  --main-invisibility-background-color: #fff;
  --fallback-invisibility-background-color: white;
}

/* universal */
* {
  font-family: "Rubik", sans-serif;
  font-style: normal;
}

/* specific generics */

/* special links */
a.nav_item {
    font-size: 14px;
    font-weight: 700;
}

/* special section headers */
h2:has(+ div) {
    color: black;
}

/* overall */
html {
  font-size: 1.75vh;
  width: 100%;
  height: auto;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  margin: auto;
}

/* body */
body {
    margin: 0 0 0 0;
    padding-left: 10px;
    padding-right: 10px; 
}

/* header */
header {
    z-index: 9999;
    top: 0;
    left: 0;
    right: 0;
    position: sticky;
    display: flex; 
    flex-wrap: wrap;
    height: auto; 
    padding: 10px 10px 10px 10px; 
    /* border: 1px solid red; */
    background-color: color(display-p3 1 1 1); /* wide gamut; errors allowed for full credit */
}

/* main */
main {
    position: relative;
    display: flex;
    flex-wrap: wrap;
    padding-left: 10px;
    padding-right: 10px; 
}

/* footer */
footer {
    position: relative;
    display: flex; 
    flex-wrap: wrap;
    height: auto; 
    padding: 10px 10px 10px 10px; 
    /* border: 1px solid red; */
    background-color: var(--main-invisibility-background-color, --fallback-invisibility-background-color);
}

/* logo */
#visual_logo {
    position: relative;
    display: flex;
    height: auto;
    width: auto;
    max-width: 90pt;
    max-height: 63pt;
    min-width: 50pt;
    min-height: 35pt;
    background-color: hsla(0, 0%, 0%, 0);
    border-style: none;
    border-width: 0pc;
    border-radius: 0pc; 
    justify-self: center;
    align-self: center;
}

/* logo */
#text_logo {
    position: relative;
    display: flex;
    height: auto;
    font-size: 2rem;
}

/* nav */
nav {
    position: relative;
    display: flex; 
    flex-wrap: nowrap;
    height: auto;
    width: 100%;
    background-color: rgba(200, 200, 200, 1);
    padding: 10px 15px 10px 15px; 
    border-radius: 10px; 
    /* border: 1px solid red; */
    align-content: center;
    justify-content: center;
    gap: 10px;
}

/* traditional nesting of psuedo */

.nav_item {
    position: relative; 
    display: flex; 
    flex-wrap: wrap;
    height: auto;
    width: auto;
    background-color: blue; 
    border-radius: 7px;
    padding: 5px 10px 5px 10px; 
    align-items: center;
    align-content: center;
    justify-content: center;
    text-align: center;
    cursor: pointer;
    text-decoration: none; 
    color: hsl(0, 0%, 100%);
}

.nav_item:hover {
    color: blue;
    background-color: red;
}

.nav_item:active {
    background-color: color-mix(in oklab, red 50%, lime 50%); /* mixed */ 
    color: blue;
}

/* modern browser nesting */

/* for `nav_item` */
.nav_item {
    position: relative; 
    display: flex; 
    flex-wrap: wrap;
    height: auto;
    width: auto;
    background-color: blue; 
    border-radius: 7px;
    padding: 5px 5px 5px 5px; 
    align-content: center;
    justify-content: center;
    text-justify: auto;
    text-align: center;
    cursor: pointer;
    text-decoration: none; 
    color: hsl(0, 0%, 100%);
    &:hover {
        color: blue;
    }
}

/* nav - smaller devices */
@media screen and (max-width: 1250px) {
    nav {
        position: relative;
        display: flex; 
        flex-wrap: wrap;
        height: 110px;
        width: 100%;
        /* border: 1px solid red; */
        align-content: center;
        justify-content: center;
        gap: 10px;
        overflow-y: scroll;
        overflow-x: hidden;
        scrollbar-width: none;
    }
    .nav_item {
        margin-top: 5px;
        flex-wrap: nowrap;
        flex-grow: 1;
        flex-shrink: 0;
        flex-basis: 100%;
    }
}

/* section */
section {
    position: relative; 
    display: block;
    border-radius: 10px;
    background-color: #f5eb00; /* the base */
    background-color: rgb(245, 235, 0); /* the fallback */
    height: auto; 
    width: 100%;
    margin-top: 0; 
    margin-bottom: 0; 
    margin-left: 0; 
    margin-right: 0; 
    padding-top: 10px; 
    padding-bottom: 10px; 
    padding-left: 10px; 
    padding-right: 10px; 
}

/* section - content; not header */
section div {
    font-size: 1rem; 
}

/* section - content; not header */
legend ~ label {
    font-size: 1rem; 
    color: blue;
}

/* section - content; not header */
#video + #audio audio {
    border: 1px solid blue;
    border-radius: 30px;
}

/* section - content; not header */
details summary {
    font-size: 1rem; 
    color: red;
}

/* section - media */
#media-section {
    height: auto;
}

/* section - media */
#media-section > .contents {
    position: relative;
    display: grid;
    grid-template-columns: 1fr;
    grid-template-rows: 1fr 1fr 1fr;
    grid-auto-flow: row;
    justify-items: center;
    align-items: center;
    justify-content: center;
    align-content: center;
    height: auto;
    width: 100%;
    grid-gap: 10px;
    /* border: 1px solid green; */
}

/* section - media */
#media-section .contents #img {
    display: flex; 
    position: relative;
    height: auto;
    justify-content: center;
    align-content: center;
}

#media-section .contents #img img {
    height: 100px;
    width: auto;
    border: 1px solid blue;
    display: inline-block;
}

#media-section .contents #img img[alt] {
    font-size: 1rem;
    color: blue;
}

#media-section .contents #video {
    display: flex; 
    position: relative;
    height: auto;
    justify-content: center;
    align-content: center;
    /* border: 1px solid red; */
}

#media-section .contents #video video {
    height: 100px;
    width: auto;
    border: 1px solid blue;
    display: block;
}

#media-section .contents #audio {
    display: flex; 
    position: relative;
    height: auto;
    /* border: 1px solid red; */
}

/* section - media */
#media-section .contents #img, #media-section .contents #video, #media-section .contents #audio {
    position: relative; 
    display: flex;
}

/* section - media */
#media-section .contents #img img, #media-section .contents #video video {
    max-width: 50%;
    width: auto;
    height: auto;
}

/* button - submit */
#submit {
    position: relative;
    display: flex;
    background-color: blue; 
    color: white; 
    outline: none;
    border: none;
    border-radius: 7px;
    width: 100%;
    height: auto;
    padding: 5px 5px 5px 5px;
    font-size: 1rem;
    justify-content: center;
    align-content: center;
    text-justify: auto;
    text-align: center;
    cursor: pointer;
}

/* button - submit - hover */
#submit:hover {
    position: relative;
    display: flex;
    background-color: rgb(255, 0, 0);
    background-color: red; 
    color: blue; 
    outline: none;
    border-radius: 7px;
    border: none;
    width: 100%;
    height: auto;
    padding: 5px 5px 5px 5px;
    font-size: 1rem;
    justify-content: center;
    align-content: center;
    text-justify: auto;
    text-align: center;
    cursor: pointer;
}

/* button - submit - active */
#submit:active {
    position: relative;
    display: flex;
    background-color: #008000; 
    color: white; 
    outline: none;
    border-radius: 7px;
    border: none;
    width: 100%;
    height: auto;
    padding: 5px 5px 5px 5px;
    font-size: 1rem;
    justify-content: center;
    align-content: center;
    text-justify: auto;
    text-align: center;
    cursor: pointer;
}

/* link attribute customization */
a[href$="#media-section"] {
    color: green;
    font-weight: 600;
}