@charset "UTF-8";
* {
  border: 0;
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --hue: 223;
  --bg: hsl(0,0%,100%);
  --fg: hsl(var(--hue),10%,10%);
  --trans-dur: 0.3s;
  --trans-ease-in-out: cubic-bezier(0.65,0,0.35,1);
  --trans-ease-out: cubic-bezier(0.33,1,0.68,1);
  font-size: calc(20px + (40 - 20) * (100vw - 280px) / (3840 - 280));
}

body,
button {
  color: var(--fg);
  font: 1em/1.5 "DM Sans", sans-serif;
  transition: background-color var(--trans-dur), color var(--trans-dur);
}
.lead { font-size: 1.5rem; font-weight: 300;background: linear-gradient(to right, #000000 0%, #000000 50%,#999999 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color:transparent; }
.container { margin: 20px auto; max-width: 960px; }
body {
  background-color: var(--bg);

}

main {
  margin: auto;
  padding: 0.75em 0;
  max-width: min-content;
  height: 12em;
    display: flex;
}

.drop {
  --drop-trans-dur: 0.5s;
  --drop-flare-dist: 0;
  border-radius: 0.5em;
  margin: auto;
  padding: 0.25em 0.25em 0 0.25em;
  position: relative;
  min-width: 9em;
}
.drop, .drop:after {
  background-color: hsl(var(--hue), 10%, 90%);
  transition: background-color var(--trans-dur);
}
.drop:before, .drop:after {
  content: "";
  position: absolute;
}
.drop:before {
  background-image: radial-gradient(100% 100% at 100% 50%, hsla(var(--hue), 90%, 50%, 0.5), hsla(var(--hue), 90%, 50%, 0) 50%);
  display: none;
  right: 0;
  bottom: 100%;
  width: 9em;
  height: 9em;
}
.drop:after {
  border-radius: 0.4375em;
  display: block;
  top: 0.125em;
  left: 0.125em;
  width: calc(100% - 0.25em);
  height: calc(100% - 0.25em);
}
.drop__btn {
  background-color: white;
  border-radius: 0.375em;
  box-shadow: 0 0 0 0.25em hsla(var(--hue), 90%, 50%, 0);
  cursor: pointer;
  display: flex;
  align-items: center;
  line-height: 1;
  height: 2.5em;
  outline: transparent;
  margin-bottom: 0.25em;
  padding: 0.75em;
  position: relative;
  width: 100%;
  transition: background-color var(--trans-dur), box-shadow calc(var(--trans-dur) / 2) var(--trans-ease-in-out), color var(--drop-trans-dur);
  -webkit-appearance: none;
  appearance: none;
  -webkit-tap-highlight-color: transparent;
  z-index: 1;
}
.drop__btn:hover, .drop__btn:focus-visible, .drop__btn[aria-expanded=true] {
  background-color: hsl(var(--hue), 10%, 95%);
}
.drop__btn:focus-visible {
  box-shadow: 0 0 0 0.25em hsla(var(--hue), 90%, 50%, 1);
}
.drop__btn:after {
  border-top: 0.375em solid currentColor;
  border-right: 0.375em solid transparent;
  border-left: 0.375em solid transparent;
  content: "";
  display: block;
  margin-inline-start: auto;
  width: 0;
  height: 0;
  transform-origin: 50% 37.5%;
  transition: transform var(--drop-trans-dur) var(--trans-ease-out);
}
.drop__btn[aria-expanded=true]:after {
  transform: rotate(0.5turn);
}
.drop--collapsing, .drop--expanding, .drop__items {
  overflow: hidden;
}
.drop__items {
  height: 0;
}
.drop__items-inner {
  visibility: hidden;
}
.drop--collapsing .drop__btn[aria-expanded=true] {
  background-color: white;
}
.drop--collapsing .drop__btn[aria-expanded=true]:after {
  transform: rotate(0);
}
.drop--expanding:before {
  display: block;
}
.drop__items .drop__btn:hover, .drop__items .drop__btn:focus-visible {
  background-color: hsl(var(--hue), 10%, 97.5%);
  color: hsla(var(--hue), 90%, 50%);
}
.drop__items .drop__btn:focus-visible {
  box-shadow: 0 0 0 0.25em hsla(var(--hue), 90%, 50%, 0);
}
.drop__items .drop__btn:after {
  border: 0;
  content: "✓";
  display: none;
  width: auto;
  height: auto;
}
.drop__items .drop__btn--selected:after {
  display: block;
}
.drop__btn[aria-expanded=true] ~ .drop__items {
  height: auto;
}
.drop__btn[aria-expanded=true] ~ .drop__items .drop__items-inner {
  visibility: visible;
}
.drop:has([aria-expanded=true]) {
  height: auto;
}
.drop:has([aria-expanded=true]):before {
  transform: translateY(calc(9em + var(--drop-flare-dist)));
  transition: transform var(--drop-trans-dur) linear;
}

/* Dark theme */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: hsl(var(--hue),10%,10%);
    --fg: hsl(var(--hue),10%,90%);
  }

  .drop, .drop:after {
    background-color: black;
  }
  .drop__btn {
    background-color: hsl(var(--hue), 10%, 10%);
  }
  .drop__btn:hover, .drop__btn:focus-visible, .drop__btn[aria-expanded=true] {
    background-color: hsl(var(--hue), 10%, 20%);
  }
  .drop__items .drop__btn:hover, .drop__items .drop__btn:focus-visible {
    background-color: hsl(var(--hue), 10%, 15%);
    color: hsla(var(--hue), 90%, 70%);
  }
  .drop--collapsing .drop__btn[aria-expanded=true] {
    background-color: hsl(var(--hue), 10%, 10%);
  }
}