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

html {
  font-family: var(--font-family);
  font-size: 16px;
  height: 100%;
}
  
body {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  background-color: var(--bg-color);
  background-position: center bottom;
  background-repeat: no-repeat;
  background-attachment: fixed;
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}
  
.container {
  padding: 20px;
  max-width: 800px;
  margin: 20px;
  width: 100%; 
}

/* header section */
.title-container {
  text-align: center;
}

.title-container {
  color: var(--header-color);
  font-size: 2.5vw;
}

@media screen and (min-width:800px){
  .title-container {
    font-size: 20px;
  }
}

/* main section */
.text-container {
  background-color: var(--text-bg-color);
  border: 4px solid var(--text-border-color); 
}

.text-container section {
  margin: 20px;
}

.image-section img {
  width: 100%;
}

.text-section p {
  text-indent: 2rem;
  text-align: justify;
  padding-top: 20px;
  color: var(--text-color);
}

.inventory-section {
  margin: 20px;
  color: var(--text-color);
}

.inventory-section h4 {
  font-size: 15px;
  margin-bottom: 8px;
}

.inventory-section li {
  margin-left: 20px;
}

.buttons-section .btn {
  margin-top: 10px;
  background-color: var(--btn-bg-color);
  border: 2px solid var(--btn-border-color);
  border-radius: 5px;
  padding: 12px;
  color: var(--btn-color);
  outline: none;
  font-size: 16px;
  cursor: pointer;
  width: 100%;
} 

.buttons-section .btn:hover {
  background-color: var(--btn-hov-bg-color);
  border-color: var(--btn-hov-border-color);
  color: var(--btn-hov-color);
}

.buttons-section .btn:disabled {
  background-color: var(--btn-dis-bg-color);
  border-width: 0px;
  color: var(--btn-dis-color);
} 

.buttons-section .btn:disabled:hover {
  background-color: var(--btn-dis-bg-color);
  border-width: 0px;
  color: var(--btn-dis-color);
}

/* footer section */
.credits-container {
  text-align: center;
  color: var(--credits-color);
  line-height: 25px;
}

.credits-container a {
  display: block;
  color: var(--credits-link-color);
}

.credits-container a:hover {
  color: var(--credits-color);
}