:root {
  --background-color: #fefefe;
  --background-color-sky: #b3f0ff;
  --background-sky: linear-gradient(
    to bottom,
    var(--background-color-sky),
    #99d6ff
  );
  --background-color-transparent: rgba(254, 254, 254, 0.9);
  --text-color: black;
  --text-color-light: lightgrey;
  --article-border-color: #e5e5e5;
  --avatar-background-color: #f5f5f5;
  --avatar-foreground-color: #808080;
  --favourite-background-color: rgba(224, 227, 21, 0.07);

  --main-border-color: #e5e5e5;
  --main-border-width: 1px;
  --main-border-style: solid;

  --ground-color: #4a9d2a;
  --ground-gradient: linear-gradient(to bottom, #4a9d2a 0%, #3d8523 100%);

  --pre-background-color: #f5f5f5;

  --link-color: #0077cc;
  --link-visited-color: purple;
  --favourite-color: gold;
  --bookmark-color: dodgerblue;
  --nav-background-color: rgba(37, 99, 235, 0.15);
  --nav-mobile-background-color: rgba(74, 157, 42, 0.9);

  --outer-padding: 8px;
  --font-size-base: 17px;
  --line-height-base: 1.6;
  --line-height-tight: 1.4;
  --border-radius: 8px;
  --transition-fast: 150ms ease;
  --transition-medium: 250ms ease;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

@media (prefers-color-scheme: dark) {
  :root {
    --background-color: #1a1a1a;
    --background-color-sky: #020111;
    --background-sky: linear-gradient(
      to bottom,
      var(--background-color-sky) 10%,
      #3a3a52 100%
    );
    --background-color-transparent: rgba(26, 26, 26, 0.9);
    --text-color: #ededed;
    --text-color-light: grey;
    --article-border-color: #333333;
    --avatar-background-color: #333333;
    --avatar-foreground-color: #aaaaaa;

    --main-border-color: #404040;
    --main-border-style: solid;

    --ground-color: #2d5016;
    --ground-gradient: linear-gradient(to bottom, #2d5016 0%, #234011 100%);

    --pre-background-color: #262626;

    --link-color: #6189FF;
    --link-visited-color: #A380EB;
    --nav-background-color: rgba(96, 165, 250, 0.15);
    --nav-mobile-background-color: rgba(45, 80, 22, 0.9);
  }
}

body {
  background-color: var(--background-color-sky);
  background-image: url("clouds_background.svg"), var(--background-sky);
  background-repeat: repeat-x, no-repeat;
  background-attachment: fixed, fixed;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  font-weight: normal;
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--text-color);
  hyphens: auto;
  margin: 0;
  display: flex;
  flex-direction: column;
  position: relative;
  padding: 0;
}

@media (prefers-color-scheme: dark) {
  body {
    background-image: url("clouds_background_dark.svg"), url("stars_background.svg"), var(--background-sky);
    background-repeat: repeat-x, repeat-x, no-repeat;
    background-attachment: fixed, fixed, fixed;
  }
}

body > header {
  margin-top: 2em;
  margin-bottom: 3em;
  margin-left: auto;
  margin-right: auto;
  text-align: center;
  max-width: 900px;
  padding: 0 var(--outer-padding);
}

body > header h1 {
  font-size: 2.5em;
  font-weight: 700;
  margin: 0.3em 0 0 0;
  color: var(--text-color);
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

body > main {
  margin: 0 auto;
  padding: 3em 2em;
  flex-grow: 1;
  max-width: 900px;
  width: calc(100% - 2 * var(--outer-padding));
  background-color: var(--background-color);
  border-color: var(--main-border-color);
  border-width: var(--main-border-width);
  border-style: var(--main-border-style);
  border-bottom: none;
  border-radius: var(--border-radius) var(--border-radius) 0 0;
  box-shadow: var(--shadow-lg);
}

body > main a {
  color: var(--link-color);
  transition: color var(--transition-fast);
}

body > footer {
  text-align: center;
  background: var(--ground-gradient);
  color: white;
  width: calc(100% - 1em);
  padding: 0.5em;
  font-size: smaller;
  text-wrap: balance;
}

body > footer a {
  color: white;
  transition: color var(--transition-fast);
}

body > footer a:hover {
  color: white;
}

h1, h2, h3, h4, h5, h6,
button, input, label {
  line-height: var(--line-height-tight);
}

a.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 44px;
  padding: 0 32px;
  border-radius: var(--border-radius);
  background-color: var(--link-color);
  color: white;
  text-decoration: none;
  font-weight: 600;
  box-sizing: border-box;
  line-height: 1;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
  box-shadow: var(--shadow-md);
}

a.button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  background-color: #0066b3;
}

/* Responsive styles */
@media (max-width: 768px) {
  body > header h1 {
    font-size: 2em;
  }

  body > main {
    padding: 2em 1.5em;
  }
}

@media (min-width: 769px) {
  body > header {
    padding-left: var(--outer-padding);
    padding-right: var(--outer-padding);
  }
}