:root {
  --tone-1: #f44336;
  --tone-2: #ff9800;
  --tone-3: #4caf50;
  --tone-4: #2196f3;
  --tone-5: #607d8b;
  --brand-bg1: rgb(255, 117, 195);
  --brand-bg2: rgb(157, 119, 255);
  --brand-bg-gradient: linear-gradient(
    to bottom,
    var(--brand-bg2),
    var(--brand-bg2)
  );
  --thumb-highlight-color: rgba(255, 255, 254, 0.2);
  --space-xxs: 0.25rem;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-xxl: 6rem;
  --isLTR: 1;
  --isRTL: -1;
}

.card {
  --title-color: grey;
  --time-left-color: teal;
  --hanzi-grid: #fafafa;
  --stroke: #555;
  --outline: #ddd;
  --drawing: #333;
  --pinyin-color: #ef6c00;
  --simplified-color: #6495ed;
  --traditional-color: #00796b;
  --meaning-color: #607d8b;
  --icon-button-background: #63759d;
  --icon-button-background-focus: #7d92c2;
  --sidebar-color: white;
  --sidebar-background-color: #52575d;
  --header-color: #455a64;
  --surface1: rgb(226, 226, 226);
  --surface2: rgb(255, 255, 254);
  --surface3: rgb(249, 249, 249);
  --surface4: rgb(212, 212, 212);
  --text1: rgb(48, 48, 48);
  --text2: rgb(94, 94, 94);
  --brand: rgb(47, 167, 214);
  --thumb-highlight-color: rgba(0, 0, 0, 0.2);
  font-size: 20px;
  text-align: center;
  color: black;
  background-color: white;
}

.card.night_mode {
  --header-color: white;
  --title-color: #00bcd4;
  --time-left-color: #fff;
  --hanzi-grid: #262626;
  --stroke: #ffffff;
  --outline: #5b5b5b;
  --drawing: #fff;
  --pinyin-color: #27b46e;
  --simplified-color: #6495ed;
  --traditional-color: #fba910;
  --meaning-color: #00bfa5;
  --icon-button-background: #63759d;
  --icon-button-background-focus: #7d92c2;
  --sidebar-color: white;
  --sidebar-background-color: #52575d;
  --surface1: rgb(27, 27, 27);
  --surface2: rgb(37, 37, 37);
  --surface3: rgb(48, 48, 48);
  --surface4: rgb(59, 59, 59);
  --text1: rgb(240, 240, 240);
  --text2: rgb(184, 184, 184);
  --brand: rgb(118, 161, 184);
  color: white;
  background-color: #1f1f1f;
}

/* Simplified and Traditional Kai Ti Fonts */
/*
@font-face {
    font-family: 'AR PL KaitiM Big5';
    src: url('_ZenKai-Medium.ttf') format('ttf'),
        url('_ZenKai-Medium.woff2') format('woff2'),
        url('_ZenKai-Medium.woff') format('woff');
    font-weight: 500;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'AR PL KaitiM GB';
    src: url('_GBZenKai-Medium.ttf') format('ttf'),
        url('_GBZenKai-Medium.woff2') format('woff2'),
        url('_GBZenKai-Medium.woff') format('woff');
    font-weight: 500;
    font-style: normal;
    font-display: swap;
}
*/

.char-card {
  font-size: 3em;
}

/* Windows */
.win .char-card {
  font-family: "AR PL KaitiM GB", "AR PL KaitiM Big5";
}
/* macOS */
.mac .char-card {
  font-family: "AR PL KaitiM GB", "AR PL KaitiM Big5";
}
/* Linux desktops */
.linux:not(.android) .char-card {
  font-family: "AR PL KaitiM GB", "AR PL KaitiM Big5";
}

/* Material Icon Font */

@font-face {
  font-family: "Material Icons";
  font-style: normal;
  font-weight: 300;
  src: url(MaterialIcons-Regular.eot);
  /* For IE6-8 */
  src: local("Material Icons"), local("MaterialIcons-Regular"),
    url(_MaterialIcons-Regular.woff2) format("woff2"),
    url(_MaterialIcons-Regular.woff) format("woff"),
    url(https://fonts.gstatic.com/s/materialicons/v141/flUhRq6tzZclQEJ-Vdg-IuiaDsNc.woff2) format('woff2');
}

.material-icons {
  font-family: "Material Icons";
  font-weight: normal;
  font-style: normal;
  font-size: 24px;
  /* Preferred icon size */
  display: inline-block;
  line-height: 1;
  text-transform: none;
  letter-spacing: normal;
  word-wrap: normal;
  white-space: nowrap;
  direction: ltr;
  /* Support for all WebKit browsers. */
  -webkit-font-smoothing: antialiased;
  /* Support for Safari and Chrome. */
  text-rendering: optimizeLegibility;
  /* Support for Firefox. */
  -moz-osx-font-smoothing: grayscale;
  /* Support for IE. */
  font-feature-settings: "liga";
}

/* grid color for character */

.grid-color {
  margin: 6px;
  background-color: var(--hanzi-grid);
  padding: 2px;
  -webkit-box-shadow: 0px 0px 10px -5px rgba(0, 0, 0, 0.5);
  -moz-box-shadow: 0px 0px 10px -5px rgba(0, 0, 0, 0.5);
  box-shadow: 0px 0px 10px -5px rgba(0, 0, 0, 0.5);
}

.stroke-color {
  color: var(--stroke);
}

.outline-color {
  color: var(--outline);
}

.drawing-color {
  color: var(--drawing);
}

/* bottom button */

.modal-footer1 {
  padding-top: 15px;
  text-align: center;
}

.modal-footer1 a {
  display: inline-block;
  margin: 0 8px;
  float: none;
}

.text-color1 {
  font-size: 16px;
  color: var(--pinyin-color);
}

.text-color2 {
  color: var(--traditional-color);
}

.text-color3 {
  color: var(--meaning-color);
}

.text-color4 {
  font-size: 30px;
  font-weight: bold;
  color: var(--simplified-color);
}

/*https://codepen.io/colewaldrip/pen/gpEaWb*/

/* Material Icon Button */

.icon {
  margin: 3px;
  position: relative;
  display: inline-block;
  color: white;
  background-color: var(--icon-button-background);
  width: 2rem;
  height: 2rem;
  border-radius: 8px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
  transition: all 0.3s ease;
}

.icon .material-icons {
  font-size: 1rem;
  position: absolute;
  left: 0.5rem;
  top: 0.5rem;
  transition: all 0.3s ease;
}

.icon:hover,
.icon:focus {
  background-color: var(--icon-button-background-focus);
}

.sidebar {
  height: 100%;
  width: 0;
  position: fixed;
  z-index: 1;
  top: 0;
  left: 0;
  background-color: var(--surface1);
  overflow-x: hidden;
  transition: 0.5s;
  -webkit-tap-highlight-color: transparent;
}

.more-info-sidebar {
  height: 100%;
  width: 0;
  position: fixed;
  z-index: 1;
  top: 0;
  right: 0;
  background-color: var(--surface1);
  overflow-x: hidden;
  transition: 0.5s;
  -webkit-tap-highlight-color: transparent;
}

.more-info-sidebar a {
  display: flex;
  margin-bottom: 6px;
  padding: 2px;
  margin: 3px;
  border-radius: 3px;
  text-decoration: none;
  color: var(--text1);
}

.more-info-sidebar img {
  width: 28px;
  margin-right: 6px;
}

/* On smaller screens, where height is less than 450px, change the style of the sidenav (less padding and a smaller font size) */

@media screen and (max-height: 450px) {
  .sidebar {
    padding-top: 15px;
  }

  .sidebar a {
    font-size: 16px;
  }
}

.more-info-btn {
  text-align: center;
}

img {
  border-radius: 10%;
}

.practice-ch {
  border-radius: 6px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
  transition: all 0.3s ease;
  padding: 3px;
}

.meaning {
  text-align: left;
}

.tone1 {
  color: #f44336;
}

.tone2 {
  color: #fbc02d;
}

.tone3 {
  color: #4caf50;
}

.tone4 {
  color: #03a9f4;
}

.tone5 {
  color: #858585;
}

.meaning-card {
  text-align: left;
  padding: 10px;
}

.meaning {
  display: block;
}

.char {
  font-size: 30px;
}

.pinyin {
  font-size: 16px;
}

.zhuyin {
  font-size: 16px;
}

.py {
  font-size: 14px;
  color: gray;
}

.zy {
  font-size: 14px;
  color: gray;
}

.header {
  color: var(--header-color);
}

.question-sub-text {
  color: #f44336;
  font-weight: bold;
}

.tone1 {
  color: var(--tone-1);
}

.tone2 {
  color: var(--tone-2);
}

.tone3 {
  color: var(--tone-3);
}

.tone4 {
  color: var(--tone-4);
}

.char-sim-1 {
  margin: 2px;
  font-size: 30px;
}

.char-trad-1 {
  margin: 2px;
  font-size: 30px;
}

.char-pin-1 {
  margin: 2px;
  line-height: 32px;
}

.char-zhy-1 {
  margin: 2px;
  line-height: 32px;
}

small {
  line-height: 1.5;
}

[dir="rtl"]:root {
  --isLTR: -1;
  --isRTL: 1;
}

h1,
h2,
h3 {
  margin: 0;
  font-weight: 500;
}

main {
  display: grid;
  gap: var(--space-xl);
  align-content: center;
  justify-content: center;
  place-content: center;
  padding: var(--space-sm);
}

@media (min-width: 540px) {
  main {
    padding: var(--space-lg);
  }
}

@media (min-width: 800px) {
  main {
    padding: var(--space-xl);
  }
}

form {
  max-width: 89vw;
  display: grid;
  gap: var(--space-xl) var(--space-xxl);
  --repeat: auto-fit;
  align-items: flex-start;
}

section {
  display: grid;
  gap: var(--space-md);
  margin: 6px;
}

header {
  display: grid;
  gap: var(--space-xxs);
}

fieldset {
  border: 1px solid var(--surface4);
  background: var(--surface4);
  padding: 0;
  margin: 0;
  display: grid;
  gap: 1px;
  border-radius: var(--space-sm);
  overflow: hidden;
  transition: box-shadow 0.3s ease;
}

fieldset[focus-within] {
  box-shadow: 0 5px 20px -10px hsla(0, 0%, 0%, 0.5);
}

fieldset:focus-within {
  box-shadow: 0 5px 20px -10px hsla(0, 0%, 0%, 0.5);
}

fieldset a {
  text-decoration: none;
  color: var(--text1);
}

select {
  outline: none;
  border: none;
  border-radius: 12px;
  width: 34px;
  padding-left: 6px;
  color: white;
  background: linear-gradient(to right, transparent 40px, var(--surface1) 0),
    var(--brand-bg-gradient) fixed;
  transition: background 0.5s ease;
}

select > option {
  border: none;
  border-radius: 20px;
  outline: none;
  background: var(--surface3);
  font-size: 22px;
  color: var(--text1);
}

input[type="checkbox"] {
  width: 40px;
  height: 20px;
  margin: 0;
  outline-offset: 5px;
  accent-color: var(--brand);
  position: relative;
  transform-style: preserve-3d;
  cursor: pointer;
  -webkit-appearance: none;
  background: var(--surface1);
  border-radius: 20px;
  transition: 0.5s;
  box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.2);
  outline: none;
}

input:checked[type="checkbox"] {
  background: linear-gradient(to right, transparent 40px, var(--surface1) 0),
    var(--brand-bg-gradient) fixed;
  -webkit-transition: background 0.5s ease;
  transition: background 0.5s ease;
}

input[type="checkbox"]:before {
  content: "";
  position: absolute;
  width: 20px;
  height: 20px;
  border-radius: 20px;
  top: 0;
  left: 0;
  background: white;
  transform: scale(1.1);
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
  transition: 0.5s;
}

input:checked[type="checkbox"]:before {
  left: 20px;
}

input[type="number"] {
  width: 40px;
  height: 20px;
  margin: 0;
  padding: 4px;
  position: relative;
  cursor: text;
  -webkit-appearance: none;
  transition: 0.5s;
  border: 1px solid var(--surface1);
  background: var(--surface3);
  border-radius: var(--space-sm);
  text-align: end;
  outline: none;
  color: var(--text1);
  place-self: center;
}

.fieldset-item {
  background: var(--surface3);
  transition: background 0.2s ease;
  display: grid;
  gap: var(--space-md);
  padding-top: var(--space-sm);
  padding-bottom: var(--space-sm);
  padding-left: var(--space-md);
  padding-right: var(--space-md);
  text-align: left;
}

.fs-item-1 {
  grid-template-columns: 1fr var(--space-xl);
}

.fs-item-2 {
  grid-template-columns: 56px 1fr;
}

.fs-item-3 {
  grid-template-columns: 1fr 1fr;
}

.fs-item-front-back {
  padding: unset;
  text-align: center;
  gap: unset;
  cursor: pointer;
}

.front-back {
  padding: var(--space-xs);
}

.btn-active {
  color: white;
  background: var(--brand-bg2);
}

.fieldset-item[focus-within] {
  background: var(--surface2);
}

.fieldset-item:focus-within {
  background: var(--surface2);
}

.fieldset-item[focus-within] svg {
  fill: #fff;
}

.fieldset-item:focus-within svg {
  fill: #fff;
}

.fieldset-item[focus-within] picture {
  -webkit-clip-path: circle(50%);
  clip-path: circle(50%);
  background: var(--brand-bg-gradient) fixed;
}

.fieldset-item:focus-within picture {
  -webkit-clip-path: circle(50%);
  clip-path: circle(50%);
  background: var(--brand-bg-gradient) fixed;
}

.fieldset-item > :is(.input-stack, label) {
  display: grid;
  gap: var(--space-xs);
}

.fieldset-item > .input-stack > label {
  display: contents;
}

.fieldset-item svg {
  fill: var(--text2);
  height: var(--space-md);
}

.fieldset-item > input[type="checkbox"] {
  align-self: center;
  justify-self: center;
  place-self: center;
}

hr {
  border: 0;
  height: 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.3);
}

#character-target-div {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

#character-target-div > div {
  display: none;
}

#character-target-div > :first-child {
  display: block;
}

#onfinish-character-target-div::-webkit-scrollbar {
  height: 0px;
  width: 0px;
}

.close-button {
  position: absolute;
  right: 16px;
  width: 30px;
  height: 30px;
  background: red;
  border-radius: 24px;
  align-self: center;
  color: white;
  line-height: 1.5;
}

.close2 {
  font-size: 16px;
  text-align: center;
  line-height: 1.8;
}

.brand-title {
  text-align: left;
  font-weight: bold;
  font-size: 18px;
}

.brand-sub-title {
  text-align: left;
  font-size: 12px;
}

.more-side-brand {
  padding: 8px;
}