:root {
    --darkBlue : #0D152D;
    --blue :  #12193B;
    --lightBlue : #49C3EE;
    --yellow : #F9F47E;
    --orange : #F0620F;
}

* {
    box-sizing: border-box;
}

body {
    height: 100vh;
    width: 100vw;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0;
    background-color: black
}

#container {
    height: 100vmin;
    width: 100vmin;
    background-color: var(--darkBlue);
}

#intro-screen, #ending-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

h1 {
    font-family: 'Fredoka One', cursive;
    font-size: 20vmin;
    font-style: italic;
    text-transform: uppercase;
}

.neon-text {
    color: #fff;
    text-shadow:
    0 0 8px var(--orange),
      0 0 7px #fff,
      0 0 10px #fff,
      0 0 42px var(--orange),
      0 0 82px var(--orange);
}

.flicker-effect {
    animation-name: flicker;
    animation-iteration-count: infinite;
    animation-duration: 3s;
}

/* Intro screen */

#intro-screen {
    height: 100%;
    width: 100%;
}

#level-container {
    display: flex;
    flex-direction: column;
    align-items: center;
}

#intro-screen input[type=radio] {
    position: absolute;
    display: none;
}

#intro-screen input[type=radio]+ label {
    color: white;
    font-family: 'Fredoka One', cursive;
    font-size: 5vmin;
    opacity: 5%;
    margin-top: 5px;
}

#intro-screen input[type=radio]+ label:hover {
    cursor: pointer;
    opacity: 100%;
    color: white;
}

#intro-screen input[type=radio]:checked + label {
    color: white;
}

/* Game */

#game-screen {
    display: none;
    position: relative;
    height: 100%;
    width: 100%;
}

#game-grid { 
    display: grid;
    grid-template-columns: repeat(21, 1fr);
    grid-template-rows: repeat(21,1fr);
}

#game-info {
    z-index: 10; 
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    color: white;
    padding: 10px;
}

#game-info h2 {  
    font-family: 'Gemunu Libre', sans-serif;   
    font-size: 4vmin;
    margin: 0;
}

#back {
    display: flex;
    align-items: center;
    opacity: 0.3;
}

#back img {
    height: 4.5vmin;
    margin-right: 7px;
}

#back span {
    font-family: 'Gemunu Libre', sans-serif;   
    font-size: 2.5vmin;
}

#back:hover {
    cursor: pointer;
    opacity: 1;
}

.snake {
    background-color: white;
    border:var(--lightBlue) solid 1px;
    box-shadow: 0 0 5px var(--lightBlue);
    border-radius: 5px;
    width: 95%;
    height: 95%;
}

.food {
    background-color: rgba(255,255,255, 0.05);
    border-radius: 100px;
    border: solid 7px var(--yellow);
    box-shadow: 0 0 5px var(--yellow);
    width: 75%;
    height: 75%;
}

/* Ending screen */

#ending-screen {
    display: none;
    text-align: center;
}

#ending-screen button {
    border: none;
    background: none;
    color: white;
    opacity: 10%;
    font-size: 5vmin;
    text-transform: uppercase;
    font-family: 'Fredoka One', cursive;
    letter-spacing: 5px;
}

#ending-screen button:hover {
    opacity: 100%;
    cursor: pointer;
}

.mobile-warning {
    display: none;
}

/* Keyframes */

@keyframes flicker {
    0%, 18%, 22%, 25%, 53%, 57%, 100% {
        color: #fff;
        text-shadow:
            0 0 8px var(--orange),
            0 0 7px #fff,
            0 0 10px #fff,
            0 0 42px var(--orange),
            0 0 82px var(--orange);
    }
    20%, 24%, 55% {       
      text-shadow: none;
    }
  }

  @media screen and (max-width: 585px){
    .mobile-warning {
        display: block;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        color: white;
        background-color: black;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
    }

    .mobile-warning img {
        width: 60%;
    }

    
    .mobile-warning span {
        text-align: center;
        max-width: 70%;   
        font-family: 'Fredoka One', cursive;
    }
    
}