/******************/
/* Tag Formatting */

body {
    font-family: "IBM Plex Sans", sans-serif;
    max-width: 800px;
}
h1 {
    font-family: "IBM Plex Serif", serif;
    text-align: center;
}
h2 {
    font-family: "IBM Plex Serif", serif;
    font-style: italic;
    font-weight: normal;
    text-align: center;
}

h3 {
    font-family: "IBM Plex Serif", serif;
    font-weight: 600;
    text-align: center;
}

table {
    font-family: "IBM Plex Sans", sans-serif;
    border-collapse: collapse;
    width: 100%;
}
table.fixed {
    table-layout: fixed;
    width: 100%;
}
tr {
    border: none
}
th {
    border: 2px solid black;
}
td {
    border: 1px solid #999;
}
table .expression {
    text-align: center;
    margin: 1em 0.1em;
}

sup {
    display: inline-block;
    position: relative;
    top:-0.1em;
    line-height: 1;
    font-size: 0.8em;
}

sub {
    display: inline-block;
    position: relative;
    bottom:-0.1em;
    line-height: 1;
    font-size: 0.9em;
}

a,
a:active,
a:target {
    color: #0066cc;
    text-decoration: none;
}

a:hover,
a:focus {
    color: #004080;
    text-decoration: underline;
}

canvas {
    image-rendering: auto;
}

li {
    margin: 1em 0;
}

/*************************/
/* Formatting Extensions */

/* Main Sections */

.headings {
    padding: 1em 0 1em 0;
    margin: 2em 0 2em 0;
}

.section-title {
    font-family: "IBM Plex Serif", serif;
    margin: 0 0 1em 0;
    padding: 0 0 1em 0;
    font-weight: 600;
    font-size: 1.2em;
    border-bottom: 1px solid #999
}

.subsection-title {
    font-family: "STIX Two Text", "Cambria Math", "Latin Modern Math", serif;
    margin: 1.5em 0;
    font-weight: 600;
    font-size: 1.2em;
    border-bottom: 1px solid #999
}
.emphasis {
    font-weight: 600;
}
.section-footer {
    margin: 1em 0 0 0;
    padding: 1em 0 0 0;
    border-top: 1px solid #999
}
.section {
    margin: 2em;
    padding: 2em;
    background-color: beige;
    border-radius: 2em;
    border: 2px solid #999;
    box-shadow: #aaa 0.5em 0.5em 2em;
}

/* Alternate Sections */

.section-alt {
    margin: 1em;
    padding: 1em;
    background-color: #aef;
    border-radius: 2em;
    border: 2px solid #999;
}

/********************/
/* Math Expressions */

.expression, .expresssion-inline {
    font-family: "STIX Two Text", "Cambria Math", "Latin Modern Math", serif;
    font-size: 1.2em;
    margin: 1rem;
    white-space: nowrap;
}

.expression-inline {
    margin: 0;
}

.expr-label {
    display: inline;
    font-weight: bold;
    padding-right: 1em;
    font-size: 1.2rem;
}

.font-lg {
    font-size: 1.5em;
}
.font-xl {
    font-size: 2em;
}
span.variable, span.symbol, span.number, sup, sub, .fraction {
    white-space: nowrap;
}

.variable {
    font-family: "STIX Two Text", "Cambria Math", "Latin Modern Math", serif;
    font-style: italic;
}
.symbol {
    font-family: "Libertinus Math", system-ui;
    display: inline;
}

.variable, .symbol {
    margin: 0.1em;
}

.symbol.italics {
    font-style: italic;
}
.symbol.invisible {
    position: absolute;
    color: rgba(1,1,1,50%)
}
.fraction {
    display: inline-flex;
    flex-direction: column;
    vertical-align: middle;
    margin: 0 0.1em;
}
p .fraction {
    margin: 0 0.2em;
    font-size: 0.8em;
}
.numerator {
    display: inline;
    vertical-align: middle;
    align-self: center;
}
.denominator {
    display: inline;
    vertical-align: middle;
    align-self: center;
    padding-top: 1px;
}
.h-divider {
    display: inline;
    height: 1px;
    border-top:1px solid black;
    color: rgba(1,1,1,0%);
    white-space: nowrap;
}
.parens-group {
    margin: 0 -0.4em;
    display: inline-flex;
    flex-direction: row;
    align-items: center;
}
.parens-group > .parens-content {
    display: flex;
}

.sqrt {
    font-family: "Libertinus Math", system-ui;
}

.sqrt .radicand {
    font-family: "STIX Two Text", "Cambria Math", "Latin Modern Math", serif;
    border-top: 0.07em solid currentColor;
    padding-top: 0.11em;
    margin-left: -0.28em;
}

.copyonly {
    position: absolute;
    opacity: 0;
    padding: 0;
    margin: 0;
    width: 0;
    height: 0;
}

.narration sup {
    margin-right: -0.2em;
    display: inline;
}
.w50 {
    width: 50%;
}

.centered {
    text-align: center;
}

.color-inv {
    color: beige;
    background-color: black;
}

/* Bullets */

ol.nested {
    list-style-type: none;
    counter-reset: level1;
}

ol.nested li {
    counter-increment: level1;
    position: relative;
}
ol.nested > li::before {
    content: counter(level1) ". ";
    display: inline-block;
    width: 2em;
    margin-left: -2em;
}
ol.nested > li > ol.nested {
    list-style-type: none;
    counter-reset: level2;
}
ol.nested > li > ol.nested > li {
    counter-increment: level2;
    position: relative;
}
ol.nested > li > ol.nested > li::before {
    content: counter(level1) "." counter(level2);
    display: inline-block;
    width: 2.5em;
    margin-left: -2.5em;
}

/* Mobile styles */
@media only screen and (max-width: 600px) {
    body {
        width: 100%;
        margin: 0;
    }
    sup, sub {
        white-space: wrap;
        box-sizing: border-box;
        display: inline-block;
    }
    .section {
        margin: 1em 0;
        padding: 1em;
        background-color: beige;
        border-radius: 0;
        border: 0;
        border-top: 2px solid #999;
        border-bottom: 2px solid #999;
        box-shadow:  #aaa 0.25em 0.25em 1em;
    }
    .expression {
        box-sizing: border-box;
        width: 100%;
    }

}

/* Print Media */
@media print {
    .section {
        background: none;
        border: none;
        box-shadow: none;
        break-inside: avoid;
    }

    .color-inv {
        color: black;
        background-color: white;
        border: 1px solid black;
    }
    a,
    a:active,
    a:target {
        color: black;
        text-decoration: none;
    }

    a:hover,
    a:focus {
        color: black;
        text-decoration: none;
    }
}