/* Base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 18px;
  line-height: 1.7;
  color: #222;
  background: #fff;
  padding: 2rem 1.5rem;
  max-width: 680px;
  margin: 0 auto;
}

/* Header */
header {
  margin-bottom: 3rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid #eee;
}

header a {
  color: #666;
  text-decoration: none;
  font-size: 0.9rem;
}

header a:hover {
  color: #000;
}

/* Typography */
h1 {
  font-size: 2rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  line-height: 1.3;
}

.meta {
  color: #666;
  font-size: 0.9rem;
  margin-bottom: 2.5rem;
}

h2 {
  font-size: 1.4rem;
  font-weight: 600;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
}

h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

p {
  margin-bottom: 1.25rem;
}

strong {
  font-weight: 600;
}

em {
  font-style: italic;
}

/* Links */
a {
  color: #0066cc;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Blockquotes */
blockquote {
  border-left: 3px solid #ddd;
  padding-left: 1.25rem;
  margin: 1.5rem 0;
  font-style: italic;
  color: #444;
}

blockquote strong {
  font-style: normal;
}

/* Lists */
ul, ol {
  margin: 1.25rem 0;
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.5rem;
}

/* Code */
code {
  font-family: 'IBM Plex Mono', 'SF Mono', Consolas, monospace;
  font-size: 0.9em;
  background: #f5f5f5;
  padding: 0.15rem 0.4rem;
  border-radius: 3px;
}

pre {
  background: #f5f5f5;
  padding: 1rem 1.25rem;
  border-radius: 4px;
  overflow-x: auto;
  margin: 1.5rem 0;
}

pre code {
  background: none;
  padding: 0;
}

/* Callout boxes */
.callout {
  background: #f9f9f9;
  border-left: 3px solid #0066cc;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  border-radius: 0 4px 4px 0;
}

/* Contact form */
.contact-form {
  background: #f9f9f9;
  padding: 1.5rem;
  margin: 2rem 0;
  border-radius: 4px;
}

.contact-form label {
  display: block;
  font-size: 0.9rem;
  color: #444;
  margin-bottom: 0.25rem;
}

.contact-form .optional {
  color: #888;
  font-size: 0.85rem;
}

.contact-form input[type="email"],
.contact-form textarea {
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 1rem;
  padding: 0.5rem;
  border: 1px solid #ddd;
  border-radius: 3px;
  width: 100%;
  margin-bottom: 1rem;
}

.contact-form textarea {
  min-height: 100px;
  resize: vertical;
}

.contact-form button {
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 1rem;
  padding: 0.5rem 1rem;
  background: #222;
  color: #fff;
  border: none;
  border-radius: 3px;
  cursor: pointer;
}

.contact-form button:hover {
  background: #444;
}

/* Horizontal rule */
hr {
  border: none;
  border-top: 1px solid #eee;
  margin: 2.5rem 0;
}

/* Footer */
footer {
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid #eee;
  font-size: 0.9rem;
  color: #666;
}