style.css

/*
* =====================================
* Global Styles
* =====================================
*/

:root {
  --dark-button-shadow: 0 0 0.2rem #fff, 0 0 0.2rem #fff, 0 0 2rem #bc13fe,
    0 0 0.8rem #bc13fe, 0 0 2.8rem #bc13fe, inset 0 0 1.3rem #bc13fe;

  --dark-text-shadow: 0 0 0.15rem #fff, 0 0 0.65rem #bc13fe, 0 0 2.8rem #bc13fe,
    0 0 3.4rem #bc13fe, 0 0 4.4rem #bc13fe, 0 0 5rem #bc13fe;

  --font-fredoka: "Fredoka One", cursive;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: "Roboto", sans-serif;

  &.dark {
    background: url("assets/bg.gif");
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center;
  }
}

body {
  height: 100vh;
  overflow: hidden;
}

.wrapper {
  height: 100%;
  overflow: auto;
}

button {
  cursor: pointer;
  transition: scale 50ms ease;
}

button:hover {
  scale: 1.05;
}

/*
* =====================================
* Theme Switcher
* =====================================
*/

:root {
  --bg-light: #ffffff;
  --bg-dark: #121212;
  --text-light: #000000;
  --text-dark: #ffffff;
  --transition-duration: 0.3s;
}

/* General body styles */
body {
  margin: 0;
  padding: 0;
  font-family: "Roboto", sans-serif;
  background-color: var(--bg-light);
  color: var(--text-light);
  transition: background-color var(--transition-duration), color var(--transition-duration);
}

/* Dark theme styles */
body.dark {
  background-color: var(--bg-dark);
  color: var(--text-dark);
}

/* Theme switcher container */
.theme-switcher {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 1000;
}

/* Hidden checkbox */
.theme-toggle {
  display: none;
}

/* Slider styles */
.slider {
  background-color: #ddd;
  border-radius: 50px;
  width: 60px;
  height: 30px;
  position: relative;
  cursor: pointer;
  transition: background-color var(--transition-duration);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 5px;
}

/* Slider thumb */
.slider:before {
  content: "";
  position: absolute;
  width: 26px;
  height: 26px;
  background-color: var(--bg-light);
  border-radius: 50%;
  top: 2px;
  left: 2px;
  transition: transform var(--transition-duration);
}

/* Icon styles */
.icon {
  font-size: 18px;
  opacity: 1;
  transition: opacity var(--transition-duration);
}

.sun {
  color: var(--text-light);
}

.moon {
  color: var(--text-dark);
  opacity: 0; /* Hidden initially */
}

/* Toggle: checked state */
.theme-toggle:checked + .slider {
  background-color: #4d4d4d; /* Background color when checked */
}

.theme-toggle:checked + .slider:before {
  transform: translateX(30px); /* Move thumb when checked */
}

.theme-toggle:checked + .slider .sun {
  opacity: 0; /* Hide sun icon when checked */
}

.theme-toggle:checked + .slider .moon {
  opacity: 1; /* Show moon icon when checked */
}

/* Optional aesthetic styles */
body.light .slider {
  border: 2px solid var(--bg-dark); /* Border for light theme */
}

body.dark .slider {
  border: 2px solid var(--text-light); /* Border for dark theme */
}

/* Additional button styles */
.theme-button {
  padding: 10px;
  border-radius: 5px;
  cursor: pointer;
  transition: background-color var(--transition-duration);
}

.light-theme {
  background-color: #f0f0f0; /* Light theme button background */
}

.dark-theme {
  background-color: #333; /* Dark theme button background */
  color: var(--text-dark); /* Text color for dark theme button */
}

/* Dark theme active state styles */
body.dark .theme-button.dark-theme {
  border: 2px solid var(--text-dark); /* Border for dark theme button */
}

body.dark .theme-button.light-theme {
  border: none; /* Remove border for light theme button */
}


/*
* =====================================
* Score Board
* =====================================
*/

.score-wrapper {
  display: flex;
  max-width: 28rem;
  margin: 3rem auto;
  justify-content: space-between;
  align-items: center;
}

.btn-how-to,
.btn-translate {
  width: 3.5rem;
  height: 3.5rem;
  background-color: #09d635;
  border-radius: 50%;
  outline: none;
  border: unset;
}

body.dark :is(.btn-how-to, .btn-translate) {
  background-color: unset;
  box-shadow: var(--dark-button-shadow);
}

.btn-how-to {
  font-size: 1.75rem;
  font-family: var(--font-fredoka);
  color: #fff;
  font-weight: bold;
}

.btn-translate img {
  width: 1.5rem;
  height: 1.5rem;
}

.score {
  padding: 0.5rem 5rem;
  background-color: #f4f4f4;
  border-radius: 0.25rem;
}

body.dark .score {
  background-color: unset;
  box-shadow: var(--dark-button-shadow);
}

.score-title {
  margin-block: 0.5rem;
  font-size: 1.125rem;
  font-weight: normal;
}

body.dark :is(.score-result, .score-title) {
  color: #fff;
  text-shadow: var(--dark-text-shadow);
}

.score-result {
  font-family: var(--font-fredoka);
  font-weight: bold;
  font-size: 2.5rem;
  margin-block: 0;
  text-align: center;
}

@media (max-width: 480px) {
  .score-wrapper {
    padding-inline: 1rem;
  }

  .score {
    padding-inline: 3.5rem;
  }

  .score-result {
    font-size: 2rem;
  }
}

/*
* =====================================
* How to play dialog
* =====================================
*/

dialog {
  border: unset;
  border-radius: 0.5rem;
  padding: 2rem;
  width: min(80vw, 80rem);
}

body.dark dialog {
  background-image: url("./assets/howtobg.png");
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
}

dialog ::backdrop {
  background-color: #ccc;
}

.how {
  display: grid;
  grid-template-areas:
    "title cross"
    "desc desc"
    "image image";
  grid-template-columns: 1fr max-content;
}

.dialog-title {
  grid-area: title;
  text-align: center;
  font-family: var(--font-fredoka);
  font-size: 1.6rem;
}

.btn-close-dialog {
  grid-area: cross;
  justify-self: end;
  align-self: center;
  background-color: unset;
  border: unset;
  font-weight: bold;
  font-family: var(--font-fredoka);
  font-size: 1.25rem;
}

.how p {
  grid-area: desc;
  word-wrap: break-word;
  font-size: 1.3rem;
  text-align: center;
  line-height: 2rem;
}

.how p strong {
  font-family: var(--font-fredoka);
}

.how img {
  grid-area: image;
  justify-self: center;
}

body.dark :is(.dialog-title, .how p, .btn-close-dialog) {
  color: #fff;
  text-shadow: var(--dark-text-shadow);
}

@media (max-width: 480px) {
  .dialog-title {
    margin-block: 0.5rem;
  }

  .how p {
    margin-block: 0.75rem;
  }

  .how img {
    width: 12rem;
  }
}

/*
* =====================================
* Game Board
* =====================================
*/

.game-container {
  position: relative;
}

table {
  background-color: #bbb;
  border-spacing: 0.7rem;
  border-radius: 0.2rem;
  margin-inline: auto;
}

body.dark :is(table, td) {
  box-shadow: var(--dark-button-shadow);
}

td {
  border: 0;
  border-radius: 0.2rem;
  width: 6.2rem;
  height: 6.2rem;
  text-align: center;
  font-size: 2.4rem;
  font-family: var(--font-fredoka);
  background-color: #e7e7e7;
  transition: background 0.5s ease-in-out, color 0.5s ease-in-out;

  body.dark & {
    background-color: #000;
  }
}

@media (max-width: 480px) {
  .game-container {
    padding-inline: 1rem;
  }

  td {
    width: 4.2rem;
    height: 4.2rem;
    font-size: 1.6rem;
  }
}

/*
* =====================================
* Game Over
* =====================================
*/

#gameOver {
  display: none;
  position: absolute;
  top: 50%;
  left: 50%;
  translate: -50% -50%;
}

#reset {
  color: #fff;
  background-color: #09d635;
  border: none;
  padding: 0.75rem 1rem;
  border-radius: 0.75rem;
  font-family: var(--font-fredoka);
  font-size: 2rem;
  z-index: 50;

  body.dark & {
    background-color: transparent;
    text-shadow: var(--dark-text-shadow);
    box-shadow: var(--dark-button-shadow);
  }
}

@media (max-width: 480px) {
  #reset {
    padding: 0.5rem 0.75rem;
    font-size: 1.5rem;
  }
}

/*
* =====================================
* Individual Letter Style
* =====================================
*/

._2 {
  background-color: #d9ffaa;
  .dark & {
    background-color: #d9ffaa;
  }
}

._4,
.dark {
  background-color: #89fbff;
  .dark & {
    background-color: #89fbff;
  }
}

._8 {
  background-color: #ffdfff;
  .dark & {
    background-color: #ffdfff;
  }
}

._16 {
  background-color: #bd07ff;
  .dark & {
    background-color: #bd07ff;
  }
}

._32 {
  background-color: #8349ff;
  .dark & {
    background-color: #8349ff;
  }
}

._64 {
  background-color: #379944;
  .dark & {
    background-color: #379944;
  }
}

._128 {
  background-color: #5fa2f0;
  .dark & {
    background-color: #5fa2f0;
  }
}

._256 {
  background-color: #62f9ba;
  .dark & {
    background-color: #62f9ba;
  }
}

._512 {
  background-color: #ac433a;
  .dark & {
    background-color: #ac433a;
  }
}

._1024 {
  background-color: #fec601;
  .dark & {
    background-color: #fec601;
  }
}

._2048 {
  background-color: #ee5622;
  .dark & {
    background-color: #ee5622;
  }
}

._greater-than-2048 {
  color: #fff;
  background-color: #0b0c0b;
  .dark & {
    color: #fff;
    background-color: #0b0c0b;
  }
}