/* fonts */

@import url('https://fonts.googleapis.com/css2?family=Fira+Sans+Condensed:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Fira+Mono:wght@400;500;700&display=swap');

/* global styles */

:root {
  --dark: #212529;
  --light: #FFF;
  --light-primary: #C2EFEF;
  --dark-primary: #61D5D5;
  --light-secondary: #D4855E;
  --dark-secondary: #C96736;
  --measure: 75ch;
  --ratio: 1.61803398875;
  --s-5: calc(var(--s-4) / var(--ratio));
  --s-4: calc(var(--s-3) / var(--ratio));
  --s-3: calc(var(--s-2) / var(--ratio));
  --s-2: calc(var(--s-1) / var(--ratio));
  --s-1: calc(var(--s0) / var(--ratio));
  --s0: 1rem;
  --s1: calc(var(--s0) * var(--ratio));
  --s2: calc(var(--s1) * var(--ratio));
  --s3: calc(var(--s2) * var(--ratio));
  --s4: calc(var(--s3) * var(--ratio));
  --s5: calc(var(--s4) * var(--ratio));
}
* {
  line-height: var(--ratio);
  max-width: var(--measure);
  font-size: 1.25rem;
  font-family: 'Fira Sans Condensed', sans-serif;
  color: var(--dark);
  box-sizing: border-box;
}
h1,
h2,
h3,
h4,
h5,
h6 {
  margin-bottom: 1em;
}
h1 {
  font-weight: 900;
  font-style: italic;
  font-size: var(--s3);
}
h2 {
  color: grey;
  font-weight: 400;
  font-family: 'Fira Mono', monospace;
  font-size: var(--s1);
}
h3 {
  font-size:  var(--s1);
}
html,
body,
div,
header,
nav,
main,
footer {
  max-width: none;
}

/* link styles */

a {
  text-decoration: none;
  font-weight: 600;
}
a:not(.button) {
  background-image: linear-gradient(to bottom, var(--light-primary) 33%, transparent 33%);
  background-position: 0 1.75ch;
  background-repeat: no-repeat;
  background-size: 100% 2ch;
}
a:not(.button):hover {
  background-image: linear-gradient(to bottom, var(--dark-primary) 33%, transparent 33%);
}

/* nav */

nav > * {
  margin-left: 1em;
  margin-right: 1em;
}
.navigation {
  margin: 1em;
}

/* inputs */

input,
textarea {
  padding-left: .3em;
  padding-right: .3em;
  border: .2em solid var(--dark);
  border-radius: 0;
  box-shadow: inset .1em .1em 0 .1ex var(--light-primary);
  outline: none;
}
input:focus-visible,
textarea:focus-visible {
  box-shadow: inset .1em .1em 0 .1ex var(--dark-primary);
  outline: none;
}

/* buttons */

button, .button {
  background-color: var(--dark);
  color: var(--light);
  border: .2em solid var(--dark);
  padding: .1em .7em;
}
button:hover, .button:hover {
 background-color: var(--light);
 color: var(--dark);
}
.button-icon {
  font-size: var(--s2);
  padding: 0;
  border: none;
  background-color: transparent;
  color: var(--dark);
}
.button-primary {
  background-color: var(--dark-primary);
  color: var(--light);
  border: .2em solid var(--dark-primary);
}
.button-primary:hover {
  background-color: var(--light);
  color: var(--dark-primary);
  border: .2em solid var(--dark-primary);
}

.button-secondary {
  background-color: var(--dark-secondary);
  color: var(--light);
  border: .2em solid var(--dark-secondary);
}
.button-secondary:hover {
  background-color: var(--light);
  color: var(--dark-secondary);
  border: .2em solid var(--dark-secondary);
}

/* icons */

.icon {
  font-size: inherit;
  width: 0.75em;
  width: 1cap;
  height: 0.75em;
  height: 1cap;
}
.with-icon {
  display: inline-flex;
  align-items: baseline;
}

/* stack */

.stack {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
}
.stack > * + * {
  margin-top: var(--space, 1.5rem);
}
.stack > :nth-child(2) {
  margin-bottom: auto;
}

/* dialog */

.dialog {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  max-width: calc(100% - 2rem);
  max-height: calc(100% - 2rem);
  border: .2em solid var(--dark);
  background-color: var(--light);
  padding: var(--s1);
  box-shadow: .2em .2em 0 .1ex var(--light-primary);
  opacity: 1;
  transition: opacity .1s;
}
.dialog-toggling {
  opacity: 0;
}
.dialog-hidden {
  display: none;
}

/* box */

.box {
  --color-light: #eee;
  --color-dark: #222;
  color: var(--color-dark);
  background-color: var(--color-light);
  padding: var(--s1);
}
.box * {
  color: inherit;
}
.box.invert {
  /* ↓ Dark becomes light, and light becomes dark */
  color: var(--color-light);
  background-color: var(--color-dark);
}

/* center */

.center {
  box-sizing: content-box;
  max-width: var(--measure);
  margin-left: auto;
  margin-right: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* cluster */

.cluster {
  --space: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space, 1.5rem);
}
.cluster > * {
  display: flex;
  flex-wrap: wrap;
  /* ↓ multiply by -1 to negate the halved value */
  margin: calc(var(--space) / 2 * -1);
}
.cluster > * > * {
  /* ↓ half the value, because of the 'doubling up' */
  margin: calc(var(--space) / 2);
}
.cluster-space-between {
  justify-content: space-between;
  align-items: center;
}
.cluster-end {
  justify-content: end;
}

/* cover */

.cover {
  display: flex;
  flex-direction: column;
  min-height: 85vh;
  padding: 1rem;
}
.cover > * {
  margin-top: 1rem;
  margin-bottom: 1rem;
}
.cover > :first-child:not(.centered) {
  margin-top: 0;
}
.cover > :last-child:not(.centered) {
  margin-bottom: 0;
}
.cover > .centered {
  margin-top: auto;
  margin-bottom: auto;
}

/* switcher */

.switcher {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  --threshold: 30rem;
}
.switcher > * {
  flex-grow: 1;
  flex-basis: calc((var(--threshold) - 100%) * 999);
}

/* specific element styles */

.img-circle {
  --sizing: var(--s4);
  border-radius: var(--sizing);
  max-height: var(--sizing);
  margin-right: var(--s0);
}