:root {
  --bgcolor-api: rgba(240, 240, 240, 1);
  --bgcolor-open: rgba(255, 255, 255, 1);
  --bgcolor-body: rgba(100, 100, 100, 1);

  --color-open-rgb: 0, 0, 0;
  --color-open: rgba(var(--color-open-rgb), 1);
  --color-close-rgb: 100, 100, 100;
  --color-close: rgba(var(--color-close-rgb), 1);
  --color-extra-rgb: 217, 163, 46;
  --color-extra: rgba(var(--color-extra-rgb), 1);
  --color-error: rgb(204, 0, 0);
  --color-line-rgb: 170, 170, 170;
  --color-line: rgba(var(--color-line-rgb), 1);
  --color-protective-screen: rgba(0, 0, 0, 0);

  --max-widht-app: 960px;
  --padding-w: min(3vw, 20px);
  --padding-h: min(4vh, 1rem);
  --access-main-params: none;
  --access-save-as: 0;
  --main-params-background: var(--bgcolor-open);
  --save-as-background: var(--bgcolor-api);
}

div {
  box-sizing: border-box;
}

.h1 {
  font-size: min(4.5vw, 3rem);
  font-weight: 800;
}

.h2 {
  font-size: min(2vw, 1.3rem);
  font-weight: 600;
}

.h3 {
  font-size: min(2vw, 1.3rem);
  font-weight: 400;
}

.h4 {
  font-size: min(1.6vw, 1.1rem);
  font-weight: 400;
}

.h-btn {
  font-size: min(1.2vw, .8rem);
  font-weight: 600;
}

.btn-symbol {
  display: inline-block;
  position: relative;
  height: fit-content;
  line-height: 1.4em;
  padding: .1em .5em 0 .5em;
  border-radius: 6px;
  border: .2vw solid var(--color-line);
  border-color: var(--color-line);
  background: var(--bgcolor-api) no-repeat;
  background-color: var(--bgcolor-open);
  background-image: linear-gradient(to left, var(--color-line), var(--color-line));
  background-position: calc(100% - 2em) 0, calc(100% - 2em) 0, 0 0;
  background-size: .1em 100%, .1em 100%, auto auto;

  overflow: hidden;
  cursor: pointer;
}

.btn-symbol:after {
  content: "";
  display: inline-block;
  position: relative;
  margin-left: .4em;
  vertical-align: middle;
}

.btn-symbol:hover {
  border-color: var(--color-extra);
  text-shadow: -0.2vw .2vw var(--bgcolor-api);
  background-image:
    linear-gradient(to left, var(--color-extra), var(--color-extra)),
    linear-gradient(to left, var(--bgcolor-open), var(--bgcolor-open)),
    linear-gradient(var(--bgcolor-open), var(--color-extra));
}

.switch {
  appearance: none;

  height: fit-content;
  line-height: 1.2em;
  padding: 0 .3vw;
  border: .2vw solid var(--color-line);
  border-radius: 25px;
  background: var(--bgcolor-open);
  text-align: center;
  cursor: pointer;
}

.switch:hover,
.switch:focus {
  outline: none !important;
  box-shadow: none !important;

  text-shadow: -0.2vw .2vw var(--bgcolor-api);
  border-color: var(--color-extra);
  background: linear-gradient(var(--bgcolor-open), var(--color-extra));
}

.switch:focus-visible {
  outline: none !important;
  border-color: var(--color-extra);
}

input.switch:hover,
input.switch:focus {
  background: var(--bgcolor-open);
  cursor: auto;
}

.switch option {
  text-shadow: none;
  background-color: var(--bgcolor-open);
}

body {
  margin: 0;
  user-select: none;
  background-color: var(--bgcolor-body);
  font-family: sans-serif, arial, helvetica;
}

#app {
  display: block;
  position: relative;
  max-width: var(--max-widht-app);
  width: 100vw;
  margin-left: max(0px, calc(50vw - var(--max-widht-app) / 2));
  background: var(--bgcolor-api);
  margin-top: 20px;
  border-radius: 6px;
}

.section-header {
  display: flex;
  position: sticky;
  top: 0;
  flex-direction: column;
  z-index: 1;
}

header {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
  padding: 0 var(--padding-w);
  background-color: var(--color-open);
  border-top-left-radius: 6px;
  border-top-right-radius: 6px;
}

.header-logo {
  color: var(--bgcolor-open);
}

.header-logo span:nth-child(2) {
  color: var(--color-extra);
}

header .btn-symbol:after {
  content: "\1F440";
  bottom: 0.1em;
}

header .btn-symbol:active:after {
  transform: rotate(180deg);
  top: 0;
}

.header-lang {
  display: flex;
  flex-direction: row;
  align-items: center;
}

.header-lang .switch {
  color: var(--color-extra);
  background-color: var(--color-open);
  border-radius: 15%;
}

.header-lang .switch:hover,
.header-lang .switch:focus {
  color: var(--color-open);
  background: linear-gradient(var(--bgcolor-open), var(--color-extra));
}

.error-message {
  display: flex;
  align-items: center;
  overflow: hidden;
  height: 0vh;
  padding: 0 var(--padding-w);
  color: var(--color-error);
  background: var(--bgcolor-api);
  transition: height .5s ease-in-out;
}

.error-message.open {
  height: min(2.2vw, 1.5rem);
  border: .1vw solid var(--color-error);
  border-top-width: 0;
  cursor: pointer;
}

.section-main {
  display: flex;
  flex-flow: row wrap;
  justify-content: space-between;
  padding: 0 var(--padding-w);
  padding-bottom: var(--padding-h);
}

.main {
  display: block;
}

.main.params {
  position: relative;
  padding: var(--padding-h) var(--padding-w);
  padding-left: 0;
  flex: 1;
}

.main.qrcode {
  display: flex;
  flex-direction: column;
  width: fit-content;
  overflow: auto;
}

@media (max-width: 512px) {

  .main.params,
  .main.qrcode {
    width: 100%;
    padding-right: 0;
    align-items: center;
  }
}

.lang-main-text {
  padding-bottom: calc(var(--padding-h) / 2);
}

#qr-text {
  box-sizing: border-box;
  position: relative;
  width: calc(100% - var(--padding-w));
  min-height: 2em;
  max-height: 20.5em;
  height: fit-content;
  margin-left: var(--padding-w);
  border: .2vw solid var(--color-line);
  border-radius: 8px 8px 0 8px;
  padding: 1vw .5vw 1vw 1vw;

  outline: none;
  resize: vertical;
  background: var(--bgcolor-open);
}

#qr-text:hover,
#qr-text:focus {
  border-color: var(--color-extra);
}

#qr-text:disabled:hover {
  cursor: auto;
}

#qr-text:disabled {
  color: var(--color-close);
  background: var(--bgcolor-api);
}

.lang-main-params {
  padding-top: var(--padding-h);
}

.main-params {
  display: flex;
  flex-direction: column;
  padding-left: var(--padding-w);
}

.main-params .row-box {
  display: flex;
  flex-direction: row;
  justify-content: start;
  margin: calc(var(--padding-h) / 2) var(--padding-w) 0 0;
}

.main-params .switch {
  background: var(--main-params-background);
}

.main-params .col-0 {
  width: 35%;
}

.main-params .col-1 {
  width: calc(min(1.6vw, 1.1em) * 4);
  margin-right: calc(var(--padding-w) / 2);
}

.main-params .col-2 {
  width: calc(min(1.6vw, 1.1em) * 12);
  margin-right: calc(var(--padding-w) / 2);
  color: var(--color-open);
  font-weight: 600;
  text-align: center;
}

.main-params .col-3 {
  color: var(--color-extra);
  font-weight: 800;
}

#qrcode-output {
  position: relative;

  max-width: 250px;
  width: 25vw;
  max-height: 250px;
  height: 25vw;
  margin: var(--padding-h) 0;
  background: rgba(var(--color-close-rgb), .2);
}

#qrcode-output.empty {
  font-size: min(4rem, 4vw);
  font-weight: 600;
  text-shadow: .2vw .2vw var(--bgcolor-api);
}

#qrcode-output.empty::before {
  content: 'QR';
  display: flex;
  height: 100%;
  width: 100%;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--color-line);
  text-align: center;
}

#qrcode-output canvas {
  width: 100%;
  height: auto;
}

#qrcode-save-as {
  display: flex;
  position: relative;
  max-width: 250px;
  width: 25vw;
  flex-flow: row wrap;
  justify-content: space-evenly;
  border: .1vw solid transparent;
  padding: var(--padding-h) .2vw calc(var(--padding-h) / 2) .2vw;
}

.save-as-title {
  display: inline;
  position: absolute;
  top: -0.5em;
  width: min-content;
  height: max-content;
  text-align: center;
  padding: 0 .1em;
}

.save-as.btn-symbol {
  background-color: var(--save-as-background);
  background-position: calc(100% - 1.7em) 0, calc(100% - 1.7em) 0, 0 0;
}

.save-as.btn-symbol:after {
  content: "\1F847";
  margin-left: .6em;
}

.save-as.btn-symbol:active:after {
  bottom: -0.2em;
  transition: .3s;
}

@media (max-width: 512px) {

  #qrcode-output {
    min-width: 145px;
    min-height: 145px;
  }

  #qrcode-output.empty {
    font-size: 40px;
    text-shadow: 2px 2px var(--bgcolor-api);
  }

  #qrcode-save-as {
    min-width: 145px;
  }
}

.access-main-params,
.access-save-as {
  position: relative;
}

.access-main-params::after,
.access-save-as::after {
  content: " ";
  display: block;
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  background: var(--color-protective-screen);
  cursor: auto;
}

.access-main-params::after {
  bottom: var(--access-main-params);
}

.access-save-as::after {
  bottom: var(--access-save-as);
}

.hide {
  display: none;
}