.aigis1000 {
    background-image: linear-gradient(0.25turn, #F5F5F5FF, #FFFFFF00), linear-gradient(0.5turn, #F5F5F5FF, #FFFFFF00), url('aigis1000.jpeg');
    background-position: bottom 0 right 0;
    background-repeat: repeat-x;
    height: 240px;
}

.hidden {
    display: none;
}

.shadow {
    background-image: linear-gradient(0.25turn, #FFFFFF00 50%, silver);
}

.shadow[open] {
    background-image: unset;
}

.tips {
    color: crimson;
}

details>summary:hover {
    text-decoration: underline;
    text-decoration-style: solid;
    text-underline-position: under;
}

details>summary+div {
    background-color: black;
    border: 1px solid black;
}

details>summary+div iframe {
    background-color: white;
    border: 1px solid white;
    display: block;
    margin: 0 auto;
    width: 80vmin;
    height: 45vmin;
}

form {
    margin: 0.5em auto;
}

form fieldset {
    border-style: solid;
    border-width: thin;
    margin: 0;
}

input {
    font-family: 'Josefin Slab', serif;
}

input[type=button], input[type=number], input[type=submit] {
    margin: 0 0.5em;
    width: 4.5em;
}

label {
    display: inline-block;
    font-family: 'Josefin Slab', serif;
    line-height: 1.5em;
    padding: 0 0.5em;
}

label.mono {
    width: 6em;
}

main>* {
    margin: 1em 0;
}

table {
    border-collapse: separate;
    border-style: solid;
    border-width: thin;
    font-family: serif;
    margin: 1em auto;
    width: 100%;
}

table details>summary {
    line-height: 1em;
}

table div {
    padding: 0 1em;
}

table div:nth-child(odd) {
    background-color: white;
}

td, th {
    border-color: lightgray;
    border-style: solid;
    border-width: thin;
    line-height: 1.5em;
    text-align: center;
}

tr>td:first-child {
    text-align: left;
}