*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  user-select: none;
  -moz-user-select: none;
  -webkit-user-drag: none;
}

:root{
  --main-base: #000;
  --game-base: #232222;
  --font: #bababa; 
  --green: #32CD32;
  --orange: #ff5722 ;
}

/* displays error */
#error{
  color: var(--orange);
  margin-bottom: 1em;
}

/* normal padding */
.p-n{
  padding: 0 1em;
}

/* colors to reuse */
.t-green{
  color: var(--green);
}

.t-orange{
  color: var(--orange);
}

/* body */
body{
  background-color: var(--main-base);
  text-align: center;
  font-family: sans-serif;
  color: var(--font);
  height: 100vh;
}

/* button common style */
button{
  cursor: pointer;
}

/* hides item */
.d-none{
  display: none !important;
}

/* main game canvas */
#canvas{
  width: 100%;
  border: 2px solid var(--green);
  box-shadow: 0 0 2px rgba(50, 205, 50, 0.2);
  background-color: var(--game-base);
  margin: auto;
}

/* control buttons */
#controls{
  display: flex;
  margin: auto;
  padding: 0em 1em 1em 1em;
  flex-direction: column;
  width: 100%;
  align-items: center;
  justify-content: space-between;
}

#controls .btns{
  padding-top: 0.5em;
}

#controls .btns button:first-child{
  margin-bottom: 4px;
}

#controls .btns button{
  padding: 2px 5px;
  background-color: var(--orange);
  color: white;
  font-size: 16px;
  border: none;
  border-radius: 0;
  width: 8em;
  height: 2.5em;
  outline: none;
  box-shadow: none;
  font-family: sans-serif;
  margin: 0;
  text-align: center;
}

#controls .btns button:hover,
#controls .btns button:disabled{
  background-color: #bf360c;
}

#controls .btns{
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
}

/* main page when game loads */
#home-page{
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 10;
  background-color: #000000;
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2em;
  background-image: url(images/snakebg.jpg);
  background-repeat: no-repeat;
  background-position: 100% 100%;
  background-blend-mode: color-burn;
  background-size: cover;
  background-color: #4CAF50;
}

#home-page > div{  
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
}

#home-page button{
  background-color: var(--main-base);
  padding: 1em 2em;
  color: var(--green);
  font-size: 1rem;
  border-radius: 5px;
  box-shadow: none;
  outline: none;
  border: 1px solid var(--green);
  border-style: groove;
  margin-bottom: 10px;
  width: 200px;
}

#home-page button:hover:enabled {
  border-color: var(--game-base);
}

#home-page button:disabled{
  border-color: var(--green); 
  opacity: 0.5;
  cursor: not-allowed;
}

#home-page h1{
  margin-bottom: 0.4em;
  color: var(--green);
  text-shadow: -1px -1px 0 #000000, 1px 1px 0 #000000;
  font-weight: 800;
  font-size: 2.5rem;
}

#welcome{
  position: absolute;
  top: 0;
  width: 100%;
  height: 100%;
  transform: scale3d(0, 0, 0);
  animation: welcome-in 1.5s forwards;
}

@keyframes welcome-in {
  from{
    transform: scale3d(3.5, 3.5, 3.5);
  }
  to{
    transform: scale3d(0, 0, 0);
  }
}

#welcome img{
  margin: auto;
  width: 100%;
  max-width: 300px;
}

#if_err{
  color: #d0dcd2;
  margin-bottom: 0.2em;
  display: inline-block;
}

.active{
  background-color: green !important;
  border-color: var(--green) !important;
  color: var(--font) !important;
}

#home-page #resume{
  background-color: var(--orange);
  border-color: var(--orange);
}

#gameContainer{
  display: flex;
  justify-content: center;
  align-items: center;
}

/* pause button */
.setBtns{
  display: flex;
  flex-direction: column;
  width: 100%;
}

.setBtns button{
  background-color: var(--green);
  border: 2px solid var(--green);
  color: var(--game-base);
  font-size: 1rem;
  padding: 10px 16px;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s ease;
  width: 100%;
}

.setBtns button:hover{
  background-color: green;
  color: var(--green);
}

.setBtns button:nth-child(1){
  margin-bottom: 5px;
}

/* stats displaying on top of game */
.stats{
  display: flex;
  flex-direction: row;
  text-align: left;
  color: var(--font);
  justify-content: space-between;
  padding: 0.3em 1em 0.2em 1em;
  font-size: 1.5rem;
}

.stats div {
  padding: 2px 2px;
}

#score span{
  color: var(--green);
  font-weight: bold;
}

#level span{
  color: var(--green);
}

#highScore span{
  color: var(--green);
}

#canvas.pause{
  background-color: #e9ebe9;
  filter: grayscale(100%)
}

/* timer */

#timer{
  background-attachment: fixed;
  background-repeat: no-repeat;
  background-size: cover;
  position: fixed;
  z-index: 101;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: #000000d9;
  display: flex;
  justify-content: center;
  align-items: center;
}

#timer>div:first-child{
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

#count{
  color: var(--orange);
  font-size: 4rem;
}

#count-loader{
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

#count-loader div{
  width: 120px;
  height: 120px;
  background-color: transparent;
  border: 6px solid #2f2f2f;
  border-top-color: var(--orange);
  border-radius: 50%;
  transform: rotate(0deg);
  animation: spinner-count 1s 0s linear infinite;
}
@keyframes spinner-count {
  from{
    transform: rotate(0deg);
  }
  to{
    transform: rotate(360deg);
  }
}

/* pre loader */
#pre-loader{
  background-attachment: fixed;
  background-repeat: no-repeat;
  background-size: cover;
  position: fixed;
  z-index: 100;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
}

#pre-loader> div{
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 100%;
  background-color: #000000;
  color: var(--main-base);
}

#loader{
  width: 60px;
  height: 60px;
  border: 10px solid var(--game-base);
  border-radius: 50%;
  border-color: var(--green);
  border-style: dotted;
  animation: spinLoader 1.5s 0s linear infinite;
}

@keyframes spinLoader {
  from{
    transform: rotate(0deg);
  }  
  to{
    transform: rotate(360deg);
  }  
}

@media screen and (max-width: 500px) {
  .stats{
    font-size: 1.3rem;
  }
  
  .setBtns button{
    border-radius: 5px;
    padding: 7px 5px;
    font-size: 1rem;
  }

  #controls{
    padding: 0em 1em 0.5em 1em;
  }

  #controls .btns button{
    width: 6em;
  }

  #home-page button{
    width: 150px;
    font-size: 0.8rem;
    padding: 7px;
    border-radius: 5px;
  }

  #home-page h1{
    font-size: 1.8rem;
  }
}

@media screen and (max-width: 400px) {
  #controls{
    flex-wrap: wrap;
  }

  .stats{
    width: 100%;
    flex-direction: row;
    justify-content: space-between;
    font-size: 1rem;
  }

  #home-page h1{
    font-size: 1.5rem;
  }

  .btns{
    width: 100%;
    position: relative;
  }
  
  #controls .btns button{
    width: 5em;
  }
  
  .setBtns button{
    font-size: 0.8rem;
    padding: 0.5em;
  }

  #if_err{
    font-size: 0.8rem;
  }
#count-loader div{
    width: 100px;
    height: 100px;
    border-width: 5px;
  }

  #count{
    font-size: 3rem;
  }
  
}