/* === CSS VARIABLES === */
:root {
  --bg-color:         #011F3F;
  --font-color:       #FEF2BF;
  --green:            #008000;
  --red:              #ff0000;
  --yellow:           #ffff00;
  --blue:             #0000ff;

  --btn-size:           12.5rem;  
  --btn-border:         0.625rem;  
  --btn-gap:            2rem;  
  --transition-speed:   0.1s;
}

/* === RESET === */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}


/* === BASE STYLES === */

html {
  font-family: 'Press Start 2P', cursive;
  background-color: var(--bg-color);
  color: var(--font-color);
  height: 100vh;
}

body {
  height: 100vh;    
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center; 
}


/* === HEADER === */
.header {
  height: 18.75rem;
  padding: 2rem 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

#level-title {
  font-size: 2.25rem;
  margin: 5% auto;
}


/* === GRID LAYOUT === */

.grid-container {
  flex: 1;                       
  display: grid;
  grid-template-columns: repeat(2, var(--btn-size));
  grid-gap: var(--btn-gap);
  justify-content: center;      
  align-content: center;
  margin: 2rem auto;        
}

/* === BUTTON STYLES === */

.btn {
  width: var(--btn-size);
  height: var(--btn-size);
  border: var(--btn-border) solid #000;
  border-radius: 20%;
  transition:
    background-color var(--transition-speed),
    box-shadow      var(--transition-speed);
}

.green  { background-color: var(--green);  }
.red    { background-color: var(--red);    }
.yellow { background-color: var(--yellow); }
.blue   { background-color: var(--blue);   }


/* === PRESSED STATE === */

.pressed {
  box-shadow: 0 0 20px #fff;
  background-color: grey;
}


/* === FEEDBACK STATES === */

.success {
  background-color: var(--green);
  opacity: 0.8;
}

.game-over {
  background-color: var(--red);
  opacity: 0.8;
}


/* === FOOTER & CREDITS === */

.footer {
  height: 25%;
  width: 100%;
  font-size: 0.875rem;
  padding: 2rem 0;
}

.credit {
  text-align: center;
  line-height: 1.6;
  margin: 5% 0;
}

.credit a {
  color: inherit;
  font-style: italic;
  text-decoration: underline dotted;
}

.credit a:hover,
.credit a:focus {
  text-decoration: underline  ;
  outline: none;
}

.credit a:focus-visible {
  outline: 2px dashed #FEF2BF;
}