:root {
  --background-color: #fff;
  --text-color: #222;
  --border-color: #222;
  --preview-border-color: #ccc;
  --button-padding: 10px 20px;
  --button-font-size: 1rem;

  --nav-bg: #ddd;
  --nav-text: #000;
  --nav-accent: #000;

  background: var(--background-color);
  color: var(--text-color);
  font-family: sans-serif;
}

/* Dark theme override if the user prefers dark mode */
@media (prefers-color-scheme: dark) {
  :root {
    --background-color: #111;
    --nav-bg: #1f1f1f;
    --nav-text: #ffffff;
    --nav-accent: #ffffff;

    --text-color: #ddd;
    --border-color: #ddd;
    --preview-border-color: #555;
  }
}

body {
  text-align: center;
}

main {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

#mainPattern {
  margin: 0 auto 0px;
  border: 3px solid var(--border-color);
}

#grid {
  display: grid;
  grid-template-columns: repeat(3, 80px);
  grid-gap: 10px;
  justify-content: center;
  margin-bottom: 20px;
}

.preview {
  border: 1px solid var(--preview-border-color);
  cursor: pointer;
  &:hover {
    border-color: var(--border-color);
    box-shadow: 0 0 20px -10px var(--border-color);
  }
}

button {
  padding: var(--button-padding);
  font-size: var(--button-font-size);
  cursor: pointer;
  background: var(--background-color);
  color: var(--text-color);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  margin: 5px;
  &:hover {
    background: var(--border-color);
    color: var(--background-color);
  }
}

nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background-color: var(--nav-bg);
  padding: 1rem 2rem;
  margin-bottom: 30px;
  h1 {
    margin: 0;
    color: var(--nav-accent);
    font-size: 1.5rem;
  }
  .links > a {
    margin-left: 2rem;
    color: var(--nav-text);
    text-decoration: none;
    font-size: 1rem;
    transition: color 0.3s ease;
    &:hover {
      color: var(--nav-accent);
    }
  }
}

#loadingOverlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--background-color);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

#loadingBarContainer {
  width: 80%;
  max-width: 600px;
  background: var(--preview-border-color);
  border: 2px solid var(--border-color);
}

#loadingBar {
  height: 20px;
  background: var(--nav-accent);
  width: 0%;
  transition: width 0.3s ease;
}