:root {
  --bg-main: #f2ffab;
  --bg-body: #fff;
  --color-txt: #000;
  --filled-color: #000;
  --filled-bg: #caf0f8;
  --white: #fff;
  --blue: #00aeef;
  --red: #e91e63;
  --nav-size: 70px;
  --sudoku-cell-size: 50px;
  --border-radius: 10px;
  --space-y: 20px;
  --gap: 5px;
  --font-size: 1.5rem;
  --font-size-lg: 2rem;
  --font-size-xl: 3rem;
}

* {
  padding: 0;
  margin: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

@font-face {
  font-family: "ieatcrayons";
  src: url("fonts/ieatcrayons.woff") format("woff"),
       url("fonts/ieatcrayons.woff2") format("woff2");
}

@font-face {
  font-family: "appopaint";
  src: url("fonts/appopaint.woff") format("woff"),
       url("fonts/appopaint.woff2") format("woff2");
}

body {
  font-family: "appopaint", Helvetica, sans-serif;
  height: 100vh;
  background-color: var(--bg-body);
  overflow-x: hidden;
  user-select: none;
}

input {
  font-family: "appopaint", Helvetica, sans-serif;
  border: 2px solid var(--bg-main);
  color: var(--color-txt);
}

input:hover, input:focus {
  border-color: var(--blue);
}

a {
  text-decoration: none;
  color: unset;
}

ul {
  list-style-type: none;
}

nav {
  background-color: var(--bg-body);
  color: var(--color-txt);
  position: fixed;
  top: 0;
  width: 100%;
  box-shadow: 5px 2px var(--bg-main);
  z-index: 99;
}

.nav-container {
  max-width: 1280px;
  margin: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  height: var(--nav-size);
}

.nav-logo {
  font-size: var(--font-size-lg);
  color: var(--blue);
}

#settings-screen {
  position: fixed;
  top: 0;
  right: -400px;
  width: 400px;
  height: 100%;
  background-color: var(--bg-body);
  box-shadow: -5px 0 15px rgba(0,0,0,0.2);
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px;
  z-index: 200;
  transition: right 0.3s ease-in-out;
  overflow-y: auto;
}

#settings-screen, 
#settings-screen * { 
    font-family: "appopaint", helvetica, sans-serif;
}

#settings-screen.active {
  right: 0;
}

#settings-screen h2 {
  font-size: var(--font-size-xl);
  color: var(--blue);
  margin-bottom: 20px;
  align-self: flex-start;
}

.settings-section {
  display: flex;
  flex-direction: column;
  gap: 15px;
  width: 100%;
  align-items: center;
  margin-bottom: 30px;
}

.settings-section p {
  font-weight: bold;
  align-self: flex-start;
  color: var(--color-txt);
}

#btn-close-settings {
  align-self: flex-end;
  margin-top: auto;
}

.settings-btn {
  position: fixed;
  top: 10px;
  right: 10px;
  margin: 0;
  padding: 12px 15px;
  font-size: 1.35rem;
  cursor: pointer;
  background: var(--blue);
  border-radius: var(--border-radius);
  z-index: 300;
  display: grid;
  transition: transform 0.2s ease;
}

.settings-btn:hover {
  transform: scale(1.1);
}

.btn-close-panel {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 35px;
  height: 35px;
  border: none;
  border-radius: 50%;
  background-color: var(--red);
  color: var(--white);
  font-size: 1.5rem;
  cursor: pointer;
  display: grid;
  place-items: center;
  z-index: 210;
  transition: background-color 0.3s ease;
}

#highlight-controls {
  margin: 0;
  width: 100%;
}

#highlight-controls button {
  flex: 1;
  padding: 8px 12px;
  font-size: 0.9rem;
  font-family: "appopaint", Helvetica, sans-serif;
  border: none;
  background: none;
  color: var(--color-txt);
  cursor: pointer;
  transition: background-color 0.3s ease, color 0.3s ease;
}

#highlight-controls button:hover, 
#highlight-controls button.active {
  background-color: var(--blue);
  color: var(--white);
}

.theme-dropdown {
  width: 100%;
  padding: 10px;
  border-radius: var(--border-radius);
  border: 2px solid var(--bg-main);
  background-color: var(--bg-main);
  color: var(--color-txt);
  font-size: 1rem;
  font-family: "appopaint", Helvetica, sans-serif;
  cursor: pointer;
  transition: border-color 0.3s ease, background-color 0.3s ease;
}

.theme-dropdown:hover,
.theme-dropdown:focus {
  border-color: var(--blue);
  outline: none;
}

.main {
  height: 100vh;
  padding-top: var(--nav-size);
  display: grid;
  place-items: center;
}

.screen {
  position: relative;
  overflow: hidden;
  height: 100%;
  min-width: 400px;
}

.start-screen {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  transform: translateX(-100%);
  transition: transform .3s ease-in-out;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.start-screen.active {
  transform: translateX(0);
}

.start-screen > * + * {
  margin-top: 20px;
}

.input-name {
  height: 80px;
  width: 280px;
  border-radius: var(--border-radius);
  outline: 0;
  background-color: var(--bg-main);
  padding: 20px;
  font-size: var(--font-size-lg);
  text-align: center;
}

.btn {
  height: 40px;
  width: 280px;
  background-color: var(--bg-main);
  color: var(--color-txt);
  border-radius: var(--border-radius);
  display: grid;
  place-items: center;
  transition: width .3s ease-in-out;
  overflow: hidden;
  font-size: var(--font-size);
  cursor: pointer;
}

.btn-blue {
  background-color: var(--blue);
  color: var(--white);
}

.input-err { 
  border-color: var(--red);
  animation: bounce 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes bounce {
  0% { transform: translateX(0); }
  25% { transform: translateX(20px); }
  50% { transform: translateX(-20px); }
  100% { transform: translateX(0); }
}

.main-game {
  display: flex;
  height: 100%;
  flex-direction: column;
  justify-content: space-between;
  padding: 30px 0;
  transform: translateX(100%);
  transition: transform .3s ease-in-out;
}

.main-game.active {
  transform: translateX(0);
}

.main-sudoku-grid {
  display: grid;
  gap: var(--gap);
  grid-template-columns: repeat(9, auto);
}

.main-grid-cell {
  height: var(--sudoku-cell-size);
  width: var(--sudoku-cell-size);
  border-radius: var(--border-radius);
  background-color: var(--bg-main);
  color: var(--blue);
  display: grid;
  place-items: center;
  font-size: var(--font-size);
  cursor: pointer;
}

.main-grid-cell.filled {
  background-color: var(--filled-bg);
  color: var(--filled-color);
}

.main-grid-cell.selected {
  background-color: var(--blue);
  color: var(--white);
}

.main-grid-cell:hover {
  border: 2px solid var(--blue);
}

.main-grid-cell.hover {
  border: 3px solid var(--blue);
}

.dark .main-grid-cell.hover {
  border: 1px solid var(--blue);
}

.main-grid-cell.err {
  background-color: var(--red);
  color: var(--white);
}

.main-game-info {
  margin-top: var(--space-y);
  margin-bottom: 10px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.main-game-info-box {
  height: 45px;
  background-color: var(--bg-main);
  color: var(--color-txt);
  border-radius: var(--border-radius);
  display: grid;
  place-items: center;
  padding: 0 20px;
  font-size: var(--font-size);
}

.main-game-info-time {
  position: relative;
  align-items: center;
  justify-content: center;
  padding-left: 2rem;
  margin-bottom: auto;
}

.pause-btn {
  position: absolute;
  right: 10px;
  height: 30px;
  width: 30px;
  border-radius: var(--border-radius);
  background-color: var(--blue);
  color: var(--white);
  font-size: var(--font-size);
  display: grid;
  place-items: center;
  cursor: pointer;
}

.numbers {
  margin-top: var(--space-y);
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 5px;
}

.number {
  height: var(--sudoku-cell-size);
  border-radius: var(--border-radius);
  background-color: var(--bg-main);
  color: var(--color-text);
  display: grid;
  place-items: center;
  font-size: var(--font-size);
  cursor: pointer;
}

.delete   {
  background-color: var(--red);
  color: var(--white);
  height: var(--sudoku-cell-size);
  border-radius: var(--border-radius);
  display: grid;
  place-items: center;
  font-size: var(--font-size);
  cursor: pointer;
}

.pause-screen, .result-screen { 
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--bg-body);
  align-items: center;
  flex-direction: column;
  display: none;
}

.pause-screen.active, .result-screen.active { 
  display: flex;
}

pause.screen > * + *, .result-screen > * + * {
  margin-top: 20px;
}

.result-screen.active div {
  animation: zoom-in .5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.pause-screen.active .btn {
  animation: zoom-in .5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.result-screen .congrate {
  font-size:  var(--font-size-xl);
  color: var(--blue);
}

.result-screen .info {
  color: var(--color-txt);
  font-size : var(--font-size);
}

#result-time {
  color: var(--blue);
  font-size: var(--font-size-xl);
}

.zoom-in {
  animation: zoom-in .5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes zoom-in {
  0% { transform: scale(3); }
  100% { transform: scale(1); }
}

.cell-err {
  animation: zoom-out-shake .5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes zoom-out-shake {
  0% { transform: scale(2); }
  25% { transform: scale(2) rotate(30deg); }
  50% { transform: scale(2) rotate(-30deg); }
  100% { transform: scale(1); }
}

.pill-toggle {
  width: 100%;
  justify-content: space-between;
}

.pill-toggle button {
  padding: 8px 0;
  font-size: 1rem;
  border: none;
  background: none;
  color: var(--color-text);
  cursor: pointer;
  flex: 1;
  transition: background-color 0.3s ease, color 0.3s ease;
  width: 100%;
  min-width: 50px;
}

.pill-toggle button:hover {
  background-color: var(--blue);
  color: var(--white);
}

.pill-toggle button.active {
  background-color: var(--blue);
  color: var(--white);
}

.dark .pill-toggle {
  border-color: var(--bg-body);
  background-color: var(--bg-body);
}

.dark .pill-toggle button {
  color: var(--color-txt);
}

.dark .pill-toggle button:hover,
.dark .pill-toggle button.active {
  background-color: var(--blue);
  color: var(--white);
}


@media only screen and (max-width: 800px) {
  :root {
    --nav-size: 50px;
    --sudoku-cell-size: 30px;
    --border-radius: 5px;
    --space-y: 10px;
    --gap: 2px;
    --font-size: 1rem;
    --font-size-lg: 1.5rem;
    --font-size-xl: 2rem;
  }
  .input-name, .btn {
    height: 50px;
  }
  .main-grid-cell.hover {
    border-width: 2px;
  }
  .screen {
    min-width: unset;
  }
  .pill-toggle {
    top: 5px;
    right: 5px;
  }
  .pill-toggle button {
    font-size: 0.8rem;
    padding: 3px 6px;
  }
}