:root {
  --counter-value: 0;
}
html {
  font-family: 'Tinos', serif;
  font-size: 18px;
  line-height: 1.4;
  tab-size: 4;
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
  vertical-align: baseline;
}
.light body,.light html {
  background-color: rgb(240,240,240);
  color: #111;
  transition: background-color 300ms, color 300ms;
}
.dark body,.dark html {
  background-color: rgb(15,15,15);
  color: #eee;
  transition: background-color 300ms, color 300ms;
}
.dark body svg.moon {display: none;}
.light body svg.sun {display: none;}

.dark h3 {color: #ccc;}   /* f e d c b a 9 8 */
.light h3 {color: #333;}  /* 0 1 2 3 4 5 6 7 */  

hr {border: 1px solid gray;}
hr.top {border: 1px solid black;}

.light hr {border: 1px solid gray;}
.light hr.top {border: 1px solid black;}

.dark hr {border: 1px solid #gray;}
.dark hr.top {border: 1px solid #eee;}

main {
  display: inline-block;
  padding: 0px 20px;
}
section {padding: 0px 20px 30px 20px;}
h1 {
  padding-top: 60px;
  font-family: 'Merriweather Sans', sans-serif;
  font-weight: 500;
  font-size: 24px;
  line-height: 1.2;
}
h3 {line-height:1.2;}
.dark h1 {
  color: white;
}  
.light h1 {
  color: black;
}  
.foot { margin-left: 20px; }
header, article { padding-top: 40px; }
@media(min-width:360px){
  h1 {font-size: 31px;}
}
@media(min-width:640px){
  html {
    font-size: 21.4px;
    line-height: 1.3084;
  }
  body {
    margin: 0px auto;
    max-width: 600px;
  }
}
@media(min-width:900px){
  body {
    margin: 0px auto;
    max-width: 1000px;
  }
  main {
    display: grid;
    grid-template-columns: 0.4fr 1fr;
    gap: 9px;
    padding: 0px 50px;
  }
  header {
    padding-left: 20px;
    padding-right: 20px;
  }
  section {padding: 0px 50px 50px 50px;}
  h1 {
    font-size: 42px;
  }
  .foot { margin-left: 50px; }
}
header p:nth-child(1) {
  font-size: 36px;
  margin-top: 18px;
  margin-bottom: 0px;
  line-height: 1;
}

header p:nth-child(2) {margin-top: calc(1em + 1px);}
header p.sub {
  margin-top: 33px;
  font-size: 18px;
  font-weight: normal;
  color: #777;
}
.dark header p.sub span {color:#eee;}
.light header p.sub span {color:#000;}
figure {
  margin-left: 0;
  margin-right: 0;
  line-height: 0;
}
canvas {max-width: 100%;}
pre {
  max-width: calc(100vw - 40px);
  margin: 0px;
  line-height: 1;
  background-color: #ddd;
}
code {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 16px;
  font-weight: 400;
}
.light pre {
  color: currentColor;
  background-color: #ddd;
}
.dark pre {
  color: currentColor;
  background-color: #222;
}
article {border-bottom: 1px #777 dotted;}
img {max-width: 100%; box-sizing: border-box;}
.light img.imgborder {border: 1px  solid #ddd;}
.dark img.imgborder {border: 1px  solid #222;}
.btnctrl {color:red;cursor:pointer;}
figure {
  margin-bottom: 2px;
  max-width: 100%;
}
figure svg {max-width: 100%;}
figcaption {
  font-size: 12px;
  font-family: sans-serif;
}
.dark figcaption {color: #888;}
.light figcaption {color: #666;}
.light p code {
  background-color: #eee;
  transition: background-color 100ms, color 100ms;
}
.dark p code {
  background-color: #222;
  transition: background-color 100ms, color 100ms;
}
.row {
  display: flex;
  flex-wrap: wrap;
  flex-direction: row;
}
.colL, .colR {
  flex: 0 0 100%;
  max-width: 100%;
}
.colL p, .colR p {margin-top:0;}
@media(min-width:900px){
  /*code {font-size: inherit;}*/
  .row {gap: 20px;}
  .colL {
    flex: 0 0 calc(38% - 10px); /* room for gap */
    max-width: calc(38% - 10px);
  }
  .colR {
    flex: 0 0 calc(62% - 10px);
    max-width: calc(62% - 10px);
  }
}

a {
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
  text-decoration-thickness: 1px;
}
.light a {
  color: #005959;
  transition: color 100ms;
}
.dark a {
  color: #93fdfd;
  transition: color 100ms;
}

u {
  text-decoration: underline;
  text-decoration-color: #7f7f7f;
  text-decoration-thickness: 1px;
}
.zoom { transition: transform 500ms; }
.zoom2 { transition: transform 500ms; }

/* X offset hacks */
.zoom.zoomed { transform: scale(2.0) translateX(70px); }
@media(min-width:640px){
  .zoom.zoomed { transform: scale(2.0) translateX(120px); }
}
@media(min-width:900px){
  .zoom.zoomed { transform: scale(2.0) translateX(0px); }
}
.zoom2.zoomed { transform: scale(1.86163522) translateX(64px); }
@media(min-width:640px){
  .zoom2.zoomed { transform: scale(1.86163522) translateX(108px); }
}
@media(min-width:900px){
  .zoom2.zoomed { transform: scale(1.86163522) translateX(0px); }
}

.light .emph {
  color: #005959;
  transition: color 100ms;
}
.dark .emph {
  color: #93fdfd;
  transition: color 100ms;
}
ul {
  list-style-type: none;
  padding-left: 20px;
}
.index p {margin:0;color:#7f7f7f;}
.indexA p {margin:0;}
.indexA p span {color:#7f7f7f;}

/* citation/reference styling */
cite { font-style: normal; }
cite::before { content: attr(data-num); }
.refs { padding-left: 20px; font-size:16px; }
.refs a { text-decoration: none; }
.refs a:hover { text-decoration: underline; }
.refs a::before { content: ''; }
.refs a::after { content: ' '; }
cite span { display: none; }
ol {
  list-style-type: none; 
  counter-reset: my-counter var(--counter-value); /* initialize the counter */
  padding-left: 0; 
}
ol li {
  counter-increment: my-counter;
  /*margin-bottom: 10px;*/
  position: relative;
  padding-left: 12px;
}
ol li::before {
  content: "[" counter(my-counter) "] ";
  position: absolute;
  left: -20px;
  color: #808080; /* gray for the brackets */
}