```css
:root {
  --body-sans-font: Geist, Arial, sans-serif;
  --body-preformatted-font: "Iosevka Curly", monospace;
  --body-title-font: Podkova, Georgia, serif;

  /* BBC News color palette */
  --background: #ffffff;
  --text: #141414;
  --text-selection: #f5c6c6;
  --preformatted-background: #f2f2f2;
  --link-foreground: #bb1919;
  --link-background: transparent;
  --blockquote-border-left: 4px solid #bb1919;

  --progress-bar-outline: #bb1919 solid 3px;
  --progress-bar-fill: #bb1919;

  --bbc-red: #bb1919;
  --bbc-dark: #141414;
  --bbc-gray: #f2f2f2;
  --bbc-border: #d9d9d9;
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #1c1c1c;
    --text: #f5f5f5;
    --text-selection: #7d2525;
    --preformatted-background: #2b2b2b;
    --link-foreground: #ff7777;
    --link-background: transparent;
    --blockquote-border-left: 4px solid #bb1919;

    --bbc-dark: #f5f5f5;
    --bbc-gray: #292929;
    --bbc-border: #444444;
  }
}

@font-face {
  font-family: "Geist";
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url("./static/geist.woff2") format("woff2");
}

@font-face {
  font-family: "Podkova";
  font-style: normal;
  font-weight: 400 800;
  font-display: swap;
  src: url("./static/podkova.woff2") format("woff2");
}

@font-face {
  font-family: "Iosevka Curly";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("./static/iosevka-curly.woff2") format("woff2");
}

/* Main layout */
main {
  font-family: var(--body-sans-font);
  max-width: 64rem;
  padding: 2rem;
  margin: auto;
}

/* Global styles */
* {
  box-sizing: border-box;
}

body {
  background: var(--background);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
}

html,
body {
  min-height: 100%;
  margin: 0;
}

/* Selection */
::selection {
  background: var(--text-selection);
}

/* Centered content */
.centered-div {
  text-align: center;
}

/* Status */
#status {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  color: var(--bbc-red);
}

/* Progress bar */
#progress {
  display: none;
  width: min(30rem, 90%);
  height: 0.75rem;
  border-radius: 0;
  overflow: hidden;
  margin: 1.5rem 0 2rem;
  outline-offset: 3px;
  outline: var(--progress-bar-outline);
}

.bar-inner {
  background-color: var(--progress-bar-fill);
  height: 100%;
  width: 0;
  transition: width 0.25s ease-in;
}

@media (prefers-reduced-motion: no-preference) {
  .bar-inner {
    transition: width 0.25s ease-in;
  }
}

/* Code blocks */
pre {
  background-color: var(--preformatted-background);
  padding: 1.25rem;
  border: 1px solid var(--bbc-border);
  border-left: 4px solid var(--bbc-red);
  font-family: var(--body-preformatted-font);
  overflow-x: auto;
  line-height: 1.5;
}

/* Links */
a,
a:active,
a:visited {
  color: var(--link-foreground);
  background-color: var(--link-background);
  text-decoration: none;
  font-weight: 600;
}

a:hover {
  text-decoration: underline;
}

/* Headlines */
h1,
h2,
h3,
h4,
h5 {
  font-family: var(--body-sans-font);
  color: var(--bbc-dark);
  line-height: 1.2;
  font-weight: 750;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

h1 {
  font-size: clamp(2rem, 5vw, 2.75rem);
  border-bottom: 4px solid var(--bbc-red);
  padding-bottom: 0.75rem;
}

h2 {
  font-size: 1.75rem;
}

h3 {
  font-size: 1.35rem;
}

h4,
h5 {
  font-size: 1.1rem;
}

/* Blockquotes */
blockquote {
  border-left: var(--blockquote-border-left);
  margin: 1.5rem 0;
  padding: 0.75rem 1.25rem;
  background: var(--bbc-gray);
  font-weight: 500;
}

/* Horizontal dividers */
hr {
  border: 0;
  border-top: 1px solid var(--bbc-border);
  margin: 1.5rem 0;
}

/* Footer */
footer {
  text-align: center;
  border-top: 1px solid var(--bbc-border);
  padding: 1.5rem 0;
  margin-top: 3rem;
  color: #777777;
  font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 600px) {
  main {
    padding: 1rem;
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.4rem;
  }
}
```