@import url('https://fonts.googleapis.com/css2?family=Mulish:wght@200;300;400;500;600;700;800;900;1000&display=swap');
:root {
  --fontsize: 18px;
  --fontfamily: "Mulish", serif;
}
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  transition: all 0.12s ease;
}
body {
  margin: 0;
}
header, footer {
  padding: 18px 15px;
  font-size: 22px;
  font-weight: 800;
  box-shadow: 0 5px 10px 5px rgba(0,0,0,0.05);
  margin-bottom: 30px;
  font-family: var(--fontfamily);
}
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
footer {
  background: linear-gradient(to bottom, gray, dimgrey);
  margin: 30px 0 0 0;
  color: whitesmoke;
  font-size: 17px;
  font-weight: 600;
}
section {
  margin: 30px 15px;
  padding: 15px;
  background: rgba(250,250,250);
  border: solid 1px lightgray;
  border-radius: 5px;
} 
details section {
  margin: 0;
  background: transparent;
  border: none;
}
details {
  margin: 30px 15px;
  border-radius: 5px;
  background: rgba(250,250,250);
  border: solid 1px lightgray;
}
summary {
  height: 43px;
  background: rgba(0,0,0,0.05);
  padding: 10px 20px 10px 30px;
  border-radius: 5px 5px 0 0;
  color: dimgrey;
  font-size: 17px;
  font-weight: 700;
  font-family: var(--fontfamily);
  cursor: pointer;
  position: relative;
  display: block;
}
summary:before {
  content: '';
  border-width: 7px;
  border-style: solid;
  border-color: transparent transparent transparent dimgrey;
  position: absolute;
  top: 15px;
  left: 13px;
  transform: rotate(0);
  transform-origin: .2rem 50%;
  transition: .25s transform ease;
}
details[open] > summary:before {
  transform: rotate(90deg);
}
details summary::-webkit-details-marker {
  display: none;
}
label {
  display: block;
  margin-bottom: 15px;
  font-size: 0;
  border-radius: 5px;
  background: rgba(0,0,0,0.05);
  padding: 10px;
}
#for-button {
  border-radius: 5px;
  background: rgba(0,0,0,0.05);
  margin-bottom: 0;
  display: flex;
  justify-content: space-between;
}
#for-button button {
  width: 33.3%;
  margin: 0 auto;
  height: 43px;
  font-size: var(--fontsize);
  padding: 10px;
  border-radius: inherit;
}
label span {
  display: inline-block;
  margin: 0;
  padding: 0;
  font-size: var(--fontsize);
  font-family: var(--fontfamily);
  color: dimgrey;
}
.input {
  width: auto;
  max-width: calc(100vw - 130px);
  overflow-x: auto;
  white-space: nowrap;
  margin-bottom: -5px;
}
input {
  background: transparent;
  display: inline-block;
  border: none;
  border: solid 1px transparent;
  outline: none;
  width: 5px;
  font-size: 17px;
  font-family: var(--fontfamily);
  color: gray;
  margin: 0;
  border-radius: 5px;
}
input:nth-child(n+3) {
  margin-left: 5px;
}
input:focus {
  border-color: #006cff;
}
select {
  background: transparent;
  border: none;
  outline: none;
  width: 100%;
  height: 100%;
  font-size: var(--fontsize);
  color: dimgrey;
  font-family: var(--fontfamily);
}
button {
  border: none;
  outline: none;
  color: dimgray;
  background: transparent;
  cursor: pointer;
}
label button {
  width: 100%;
  height: 43px;
  font-size: var(--fontsize);
  padding: 10px;
  border-radius: inherit;
}
#done:hover {
  background: rgba(21,140,255,0.8);
  color: whitesmoke;
}
#add:hover {
  background: rgba(65, 196, 35,0.8);
  color: whitesmoke;
}
#reset:hover {
  background: rgba(255, 77, 77,0.8);
  color: whitesmoke;
}
label:hover {
  box-shadow: 0 3px 5px 1px rgba(21,140,255,0.3);
}
fieldset {
  border: solid 1px lightgray;
  border-radius: 5px;
  padding: 15px;
  color: dimgrey;
}
legend {
  font-size: var(--fontsize);
  font-family: var(--fontfamily);
  font-weight: 700;
}
fieldset:hover:nth-child(n+2) {
  transform: scale(1.01);
  background: rgba(255,255,255,0.7);
  box-shadow: 0 0 8px 3px rgba(0,0,0,0.05);
}
fieldset p {
  width: calc(100vw - 100px);
  overflow-x: scroll;
  margin: 0 auto;
  user-select: none;
}
fieldset select {
  width: 45%;
  display: inline-block;
  border: solid 1px lightgray;
  border-radius: 5px;
  padding: 5px;
  cursor: pointer;
}
fieldset:nth-child(n+2) {
  margin-top: 20px;
}
.select-set, #operation, #cartesian {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 20px;
}
.select {
  width: 100%;
}
footer div {
  margin: 20px auto 0 auto;
  padding: 20px 0 5px 0;
  text-align: center;
  border-top: solid 1px lightgray;
}
dt {
  font-weight: 700;
}
dd {
  margin: 10px 20px;
  font-weight: 400;
}
.dialog-box-cover {
  position: fixed;
  width: 100vw;
  height: 100vh;
  top: 0;
  left: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  background: rgba(0,0,0,0.55);
  z-index: 9999;
  touch-action: none;
  transition: all 0.25s ease;
}
@keyframes appear {
  from {transform: scale(0);}
  to {transform: scale(1);}
}
.dialog-box {
  width: 270px;
  height: fit-content;
  padding: 15px;
  background: whitesmoke;
  border-radius: 3.5px;
  box-shadow: 0 0 20px 10px rgba(0,0,0,0.25);
  animation: appear 0.35s ease 1;
  user-select: none; 
}
.dialog-box #message {
  font-size: 20px;
  font-family: var(--fontfamily);
  font-weight: 700;
  color: black;
  margin: 0 auto 30px auto;
}
.confirm #message {
  margin: 0 auto 75px auto;
}
.dialog-box #input {
  width: 100%;
  height: auto;
  display: none;
}
.dialog-box #input input {
  width: 100%;
  outline: none;
  border: none;
  border-bottom: solid 1px dimgrey;
  color: dimgrey;
  border-radius: 0;
}
.dialog-box-cover .prompt #input {
  display: block;
}
.dialog-box #button {
  width: 100%;
  display: flex;
  justify-content: flex-start;
  margin: 75px auto 0 auto;
}
.prompt #button {
  margin: 30px auto 0 auto;
}
.dialog-box #button button {
  width: auto;
  height: auto;
  padding: 5px;
  border-radius: 3.5px;
  font-size: 14px;
  font-weight: 600;
  font-family: var(--fontfamily);
  border: solid 1px dimgrey;
  color: whitesmoke;
}
.dialog-box #confirm {
  margin: 0 10px 0 0;
  background: rgba(65, 196, 35,0.8);
}
.dialog-box #cancel {
  margin: 0 0 0 10px;
  background: rgba(255, 77, 77,0.8);
}
.alert #cancel {
  display: none;
}
a, a:visited, a:link {
  color: inherit;
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}
#nav-bar {
  width: auto;
  height: auto;
  display: flex;
  flex-direction: column;
  justify-content: space-evenly;
}
#nav-bar span {
  display: inline-block;
  width: 25px;
  height: 3.5px;
  background: black;
  margin: 5px 0 0 0;
  border-radius: 3px;
}
#nav-bar span:first-child {
  margin: 0;
}