/* -----------------------------
   Base document reset
------------------------------ */

* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
}

body {
  margin: 0;
  padding: 0;
  background: #f1f5f9; /* slate-100 */
  color: #0f172a; /* slate-900 */
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
  line-height: 1.6;
}

/* -----------------------------
     Paper container
  ------------------------------ */

main.paper {
  max-width: 720px;
  margin: 4rem auto;
  padding: 3.5rem 4rem;
  background: #ffffff;
  border: 1px solid #e2e8f0; /* slate-200 */
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05), 0 4px 12px rgba(0, 0, 0, 0.04);
}

/* -----------------------------
     Headings
  ------------------------------ */

h1 {
  font-size: 1.6rem;
  font-weight: 600;
  margin-top: 0;
  margin-bottom: 1.75rem;
  line-height: 1.25;
}

h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
}

h3 {
  font-size: 0.95rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.5rem;
}

/* -----------------------------
     Paragraphs & lists
  ------------------------------ */

p {
  margin-top: 0;
  margin-bottom: 0.9rem;
  color: #1e293b; /* slate-800 */
}

ul {
  margin: 0 0 1rem 1.25rem;
  padding: 0;
}

li {
  margin-bottom: 0.35rem;
}

/* -----------------------------
     Emphasis
  ------------------------------ */

strong {
  font-weight: 600;
  color: #0f172a;
}

em {
  font-style: italic;
  color: #334155; /* slate-700 */
}

/* -----------------------------
     Inline code
  ------------------------------ */

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
  font-size: 0.9em;
  background: #f8fafc; /* slate-50 */
  padding: 0.15rem 0.35rem;
  border-radius: 3px;
}

/* -----------------------------
     Code blocks
  ------------------------------ */

pre {
  background: #0f172a; /* slate-900 */
  color: #f8fafc;
  padding: 1rem 1.25rem;
  border-radius: 4px;
  overflow-x: auto;
  margin: 1.25rem 0;
}

pre code {
  background: none;
  padding: 0;
  font-size: 0.85rem;
  color: inherit;
}

/* -----------------------------
     Links (rare, restrained)
  ------------------------------ */

a {
  color: #1e40af; /* muted blue */
  text-decoration: underline;
  text-underline-offset: 2px;
}

a:hover {
  color: #1e3a8a;
}

/* -----------------------------
     Print-friendly behavior
  ------------------------------ */

@media print {
  body {
    background: #ffffff;
  }

  main.paper {
    box-shadow: none;
    border: none;
    margin: 0;
    padding: 0;
    max-width: none;
  }
}

/* -----------------------------
     Small screens
  ------------------------------ */

@media (max-width: 768px) {
  main.paper {
    margin: 2rem 1rem;
    padding: 2.25rem 1.5rem;
  }
}