* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  
}

html {
  background-color: var(--bt-bright);
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  display: flex;
  flex-direction: column;
}

h1, h2, h3, h4, h5, h6 {
  color: #333;
  font-family: "Dena";
  text-align: center;
  margin: 50px 0px 50px 0px;
}

h1 { font-size: 3.815rem; }
h2 { font-size: 3.052rem; }
h3 { font-size: 2.441rem }
h4 { font-size: 1.953rem }
h5 { font-size: 1.563rem }
h6 { font-size: 1.25rem }

.flex {
  display: flex;
  /*flex-direction: row; */
  align-items: flex-start;
  justify-content: space-around;
}

.flex-col {
  display: flex;
  flex-direction: column !important;
  justify-content: center;
  align-items: center;
}


/*  Link Hyperlink href anchor ... */
a {
  color: var(--bt-red);
  display: inline;
  font-family: "Source Code Pro";
}

a:hover {
  background-color: var(--bt-red);
  color: var(--bt-bright);
  cursor: crosshair;
}

ul, ol { margin-left: 150px; }

article {
  display: flex;
  flex-direction: column;
  margin: 0px 0px 0px 25vw;
  width: 50%;
  font-family: "Source Code Pro";
}

/* Prevent oversized images inside articles */
article img  { width: 100%; }

.icon { max-width: 50px; }

button {
  width: 162px;
  height: 48px;
  border: 0px;
  border-right: 13px solid #333;
  font-size: 1.3rem;
  margin-bottom: 10px;
}

button:hover {
  cursor: crosshair;
  font-size: 2.0rem;
}

.button-ok {
  background-color: var(--bt-green);
  color: var(--bt-bright);
}

.button-alert {
  background-color: var(--bt-red);
  color: var(--bt-bright);
}

.button-warning {
  background-color: var(--bt-yellow);
  color: var(--bt-dark);
}
.button-bright {
  background-color: var(--bt-red);
  color: var(--bt-bright);
}
.button-dark {
  background-color: var(--bt-dark);
  color: var(--bt-bright);
  border-right: 13px solid var(--bt-bright);
}

/* RESPONSIVE MEDIA QUERIES START
------------------------------------------------- */
@media only screen and (max-width: 720px) {

  body { margin: 0px !important; }
  h1 { font-size: 1.8rem; }
  h2 { font-size: 1.6rem; }
  h3 { font-size: 1.4rem }
  h4 { font-size: 1.2rem }
  h5 { font-size: 1rem }
  h6 { font-size: 1rem }

  .col-1 {width: 8.33%;}
  .col-2 {width: 16.66%;}
  .col-3 {width: 25%;}
  .col-4 {width: 33.33%;}
  .col-5 {width: 41.66%;}
  .col-6 {width: 50%;}
  .col-7 {width: 58.33%;}
  .col-8 {width: 66.66%;}
  .col-9 {width: 75%;}
  .col-10 {width: 83.33%;}
  .col-11 {width: 91.66%;}
  .col-12 {width: 100%;}
  
  article {
    margin-left: 0vw !important;
    width: 99vw !important;
    align-items: normal;
    font-family: "Source Code Pro";
  }

  article * { margin-left: 2.5% !important; }

  .guard-left, .guard-right {
    display: none;
  }

  .subtitle {
    flex-direction: column;
  }
}

@media (min-width: 920px) {
  .gallery { grid-template-columns: repeat(3, minmax(420px, 1fr)); }
}
/* RESPONSIVE MEDIA QUERIES END
------------------------------------------------- */

.bt-highlight { fill: var(--bt-dark) !important; }
.opaque { 
  fill-opacity: 1 !important;
  opacity: 1 !important;
}
.transparent {
  fill-opacity: 0 !important;
  opacity: 0 !important;
}

.splitter { width: 100%; }
.keyword { font-family: "Source Code Pro"; }
.bg-agnostic {
  background: #fffa;
  padding: 20px;
  border: 1px solid #333;
  border-radius: 20px;
  display: block;
} .bg-agnostic > * { display:block; }