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

:root {
  --apple-red: #BD4858;
  --dark: #393939;
  --mid:  #ddd;;
  --light: #fff;
}

html {
  min-height: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  font-family: Rakkas, cursive;
  font-weight: normal;
  font-size: 16px;
  background-color: var(--dark);
}

h1 {
  font-size: 3rem;
  margin: 0;
  text-align: center;
  color: var(--dark);
}

#container {
  width: 100%;
  background-color: var(--light);
  background: url(images/white_plaster.png);
  display: grid;
  grid-template: 
    80px 75vw 100px auto / 
    auto 25vw 25vw 25vw auto ;
  grid-template-areas: 
    ". . A . ."
    ". B B B ."
    ". C D E ."
    ". . . . ."
  ;
}

header { grid-area: A; }
#snake-grid { grid-area: B; }
.score-area { grid-area: C; }
.info-area { grid-area: D; }
.start-area { grid-area: E; }

header {
  display: grid;
  place-content: center;
}

#snake-grid {
  display: flex;
  flex-wrap: wrap;
  background-color: var(--light);
  border-radius: 1em;
}

.score-area,
.info-area,
.start-area{
  display: flex;
  position: relative;
  justify-content: center; 
  align-items: center;
}

.score-area::after {
  display: none;
}

#score,
#start-btn,
#info-btn {
  display: grid;
  place-content: center; 
  border-radius: 50%;
  margin: 0;
}

#score,
#start-btn {
  width: 72px;
  height: 72px;
  color: var(--mid);
}

#score {
  font-size: 2rem;
  background-color: var(--apple-red);
}

.score-pop {
  transform-origin: center center;
  animation: pop 0.2s ; 
}

@keyframes pop {
  0% { transform: scale(1); }
  50% { transform: scale(1.1);  }
  100% { transform: scale(1); }
}

#start-btn {
  background-color: var(--dark);
  font-size: 1.5rem;
  cursor: pointer;
  transition: transform 0.3s ease;
}

#start-btn:hover {
  color: var(--light);
  transform: scale(1.05);
}

#info-btn, #close-btn {
  color: var(--dark);
  border: 2px solid var(--dark);
  opacity: 0.4;
  transition: opacity 0.3s ease;
  cursor: pointer;
}

#info-btn:hover,
#close-btn:hover {
  opacity: 1;
}

#info-btn {
  font-family: Rakkas, cursive;
  font-size: 1.75rem;
  width: 48px;
  height: 48px;
  margin: 0;
}

#info-overlay {
  display: none;
  width: 100%;
  height: 100%;
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background-color: rgba(0,0,0, 0.7);
  z-index: 10;
}

#info-modal {
  background-color: var(--light);
  background: url(images/white_plaster.png);
  border-radius: 16px;
  padding: 20px;
  margin: 0 2em;
  position: relative;
  top: 25%;
  z-index: 20;
  font-family: 'Roboto Slab', serif;
}

#close-btn {
  font-size: 1rem;
  width: 160px;
  display: block;
  margin: 3em auto 0.5em;
  padding: 0.5em;
  border-radius: 8px;
  font-family: 'Roboto Slab', serif;
}

/* --------------------------------- */

@media (min-width: 560px) {
  #container {
    margin: 1em;
    width: calc(100% - 2em);
    height: calc(100vh - 2em);
    min-height: 620px;
    border-radius: 16px;
    grid-template: 
      80px 420px 100px auto / 
      auto 140px 140px 140px auto;
      grid-template-areas: 
      ". . A . ."
      ". B B B ."
      ". C D E ."
      ". . . . ."
    ;
  }
  
  #info-modal {
    max-width: 500px;
    padding: 40px;
    margin: 0 auto;
  }
}

@media (min-width: 760px) {
  #container {
    margin: 2.5em;
    width: calc(100% - 5em);
    height: calc(100vh - 5em);
    min-height: 700px;
    grid-template: 
      130px 20vw 20vw auto / 
      auto 180px 20vw 20vw 180px auto ;
    grid-template-areas: 
      ". . A A . ."
      ". C B B E ."
      ". . B B D ."
      ". . . . . ."
    ;
  }
  
  h1 {
    font-size: 4rem;
  }
 
  #score,
  #start-btn {
    width: 138px;
    height: 138px;
  }

  #score {
    font-size: 4.5rem;
  }

  #start-btn {
    font-size: 2.25rem;
  }
  
  #info-btn {
    align-self: flex-start;
  }
  
  #info-modal {
    max-width: 700px;
  }

}

@media (min-width: 960px) {
  #container {
    grid-template: 
      100px 250px 250px auto / 
      auto 200px 250px 250px 200px auto ;
    grid-template-areas: 
      ". . A A . ."
      ". C B B E ."
      ". . B B D ."
      ". . . . . . "
    ;
  }
}

.square {
  width: 10%;
  height: 10%;
}

/* ------------------- */
.snake-head-north,
.snake-head-east,
.snake-head-south,
.snake-head-west {
  background-image: url('images/snake-head.svg');
}

.snake-head-north {transform: rotate(180deg);}
.snake-head-east {transform: rotate(-90deg);}
.snake-head-south {transform: rotate(0deg);}
.snake-head-west {transform: rotate(90deg);}

.snake-head-north-dead,
.snake-head-east-dead,
.snake-head-south-dead,
.snake-head-west-dead {
  background-image: url('images/snake-head-dead.svg');
}

.snake-head-north-dead {transform: rotate(180deg);}
.snake-head-east-dead { transform: rotate(-90deg);}
.snake-head-south-dead {transform: rotate(0deg);}
.snake-head-west-dead {transform: rotate(90deg);}

.snake-vertical,
.snake-horizontal {
  background-image: url('images/snake-body.svg');
}

.snake-vertical {transform: rotate(0deg);}
.snake-horizontal {transform: rotate(90deg);}

.snake-neck-nw,
.snake-neck-ne,
.snake-neck-se ,
.snake-neck-sw {
  background-image: url('images/snake-turn.svg');
}

.snake-neck-nw {transform: rotate(0deg);}
.snake-neck-ne {transform: rotate(90deg);}
.snake-neck-se {transform: rotate(180deg);}
.snake-neck-sw {transform: rotate(-90deg);}

.snake-tail-n,
.snake-tail-e,
.snake-tail-s,
.snake-tail-w {
  background-image: url('images/snake-tail.svg');
}

.snake-tail-n {transform: rotate(0deg);}
.snake-tail-s {transform: rotate(180deg);}
.snake-tail-e {transform: rotate(90deg);}
.snake-tail-w {transform: rotate(-90deg);}

.apple {
  background-image: url('images/apple.svg');
}

.rumble {
  transform-origin: center center;
  animation: rumble 0.5s;
}

@keyframes rumble {
  0% { transform: rotate(0deg); }
  10% { transform: rotate(-2deg); }
  20% { transform: rotate(2deg); }
  30% { transform: rotate(0deg); }
  40% { transform: rotate(2deg); }
  50% { transform: rotate(-2deg); }
  60% { transform: rotate(0deg); }
  70% { transform: rotate(-2deg); }
  80% { transform: rotate(2deg); }
  90% { transform: rotate(0deg); }
  100% { transform: rotate(-2deg); }
}