:root {
  color-scheme: dark;
  --bg: #030405;
  --panel: #090c0e;
  --panel-edge: #1e2b32;
  --text: #f3f7f8;
  --muted: #c9d2d6;
  --heading: #ffffff;
  --code-bg: #11191f;
  --code-text: #fff1b8;
  --link: #72dfff;
  --link-hover: #b9f1ff;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 15% 0%, rgba(21, 72, 86, 0.32), transparent 30rem),
    linear-gradient(180deg, #030405 0%, #07090a 48%, #020303 100%);
  color: var(--text);
  font-family: "IBM Plex Sans", "Segoe UI", system-ui, -apple-system, sans-serif;
}

.codex-shell {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0 72px;
}

.codex-actions {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 14px;
}

.raw-markup-button {
  border: 1px solid #2d5665;
  background: #0d1b21;
  color: var(--link);
  font-size: 0.92rem;
  font-weight: 700;
  line-height: 1;
  padding: 0.68rem 0.9rem;
  text-decoration: none;
}

.raw-markup-button:hover {
  border-color: #4eaec7;
  background: #102a34;
  color: var(--link-hover);
}

.codex-article {
  background: color-mix(in srgb, var(--panel) 94%, #0f2630);
  border: 1px solid var(--panel-edge);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.72);
  padding: clamp(22px, 4vw, 46px);
}

.codex-article p,
.codex-article li {
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.75;
}

.codex-article p {
  margin: 0 0 1.05rem;
}

.codex-article h3 {
  color: var(--heading);
  font-size: clamp(1.35rem, 2vw, 1.7rem);
  line-height: 1.25;
  margin: 2.1rem 0 0.8rem;
  padding-bottom: 0.45rem;
  border-bottom: 1px solid #253842;
}

.codex-article h3:first-of-type {
  margin-top: 1.4rem;
}

.codex-article a {
  color: var(--link);
  text-decoration-color: rgba(114, 223, 255, 0.5);
  text-underline-offset: 0.18em;
}

.codex-article a:hover {
  color: var(--link-hover);
  text-decoration-color: currentColor;
}

.codex-article .headerlink {
  display: none;
}

.codex-article code {
  background: var(--code-bg);
  border: 1px solid #263743;
  color: var(--code-text);
  font-family: "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 0.94em;
  padding: 0.12rem 0.35rem;
}

@media (max-width: 640px) {
  .codex-shell {
    width: min(100% - 20px, 920px);
    padding: 20px 0 42px;
  }

  .codex-article {
    padding: 20px;
  }
}