/* Base styling */
body {
  font-family: system-ui, sans-serif;
  background-color: #c0c0c0;
  color: #000;
  margin: 0;
  padding: 1em;
  line-height: 1.5;
}

/* Headings */
h1,
h2,
h3,
h4,
h5,
h6 {
  margin-top: 1em;
  margin-bottom: 0.5em;
}

/* Links */
a {
  color: #0000ee;
  text-decoration: underline;
}

a:visited {
  color: #551a8b;
}

a:hover {
  color: #ff0000;
}

/* Paragraphs and layout */
p {
  margin: 1em 0;
  max-width: 66ch;
}


/* Lists */
ul,
ol {
  margin-left: 2em;
}

/* Buttons and inputs */
button,
input,
select,
textarea {
  font-family: inherit;
  font-size: 1rem;
  padding: 0.25em;
  border: 2px inset #ccc;
  background-color: #fff;
  color: #000;
}

button:hover {
  background-color: #eee;
  cursor: pointer;
}

/* Tables (classic bordered layout) */
table {
  border-collapse: collapse;
  width: 100%;
  margin: 1em 0;
  background-color: #fff;
}

th,
td {
  border: 1px solid #000;
  padding: 0.5em;
  text-align: left;
}

/* Modern responsive container */
.container {
  max-width: 960px;
  margin: 0 auto;
  background-color: #fff;
  padding: 1em;
  box-shadow: 0 0 5px #999;
}

/* Mobile devices */
@media (max-width: 768px) {
  .container {
    max-width: 100%;
    margin: 0;
    padding: 0.5em;
  }
}

/* Responsive images */
img {
  max-width: 100%;
  height: auto;
}

/* Accessibility: focus ring */
a:focus,
button:focus,
input:focus,
select:focus,
textarea:focus {
  outline: 2px dashed #000;
  outline-offset: 2px;
}

ul.icons {
  cursor: default;
  list-style: none;
  padding-left: 0;
}

ul.icons li {
  display: inline-block;
  padding: 0 1em 0 0;
  min-width: 1em;
}

@media (prefers-color-scheme: dark) {
  body {
    background-color: #000;
    color: #ccc;
  }

  .container {
    background-color: #111;
    box-shadow: 0 0 5px #666;
  }

  a {
    color: #44aaff;
  }

  a:visited {
    color: #aa88ff;
  }

  a:hover {
    color: #ff6666;
  }

  button,
  input,
  select,
  textarea {
    background-color: #222;
    color: #eee;
    border: 2px inset #666;
  }

  table {
    background-color: #111;
  }

  th,
  td {
    border: 1px solid #666;
    color: #ccc;
  }

  a:focus,
  button:focus,
  input:focus,
  select:focus,
  textarea:focus {
    outline: 2px dashed #ccc;
  }
}