/* Lesson content container */
.md {
  line-height: 1.7;
  font-size: 1.5rem;
}

/* Headings */
.md h1 {
  font-size: 2.15rem;
  font-weight: 700;
  margin: 2rem 0 2.5rem 0;
  line-height: 1.2;
}

.md h2 {
  font-size: 1.6rem;
  font-weight: 600;
  margin: 2.2rem 0 1.4rem 0;
  line-height: 1.3;
}

.md h3 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 1.5rem 0 1rem;
  line-height: 1.4;
}

.md h4 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 1.25rem 0 0.75rem;
  line-height: 1.4;
}

/* Paragraphs and spacing */
.md p {
  margin: 1.25rem 0;
}

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

.md li {
  margin: 0.5rem 0;
}

.md ul li {
  list-style-type: disc;
}

.md ol li {
  list-style-type: decimal;
}

/* Links */
.md a {
  color: #00AAFF;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.md a:hover {
  border-bottom-color: currentColor;
}

/* Blockquotes */
.md blockquote {
  margin: 1.5rem 0;
  padding: 1rem 1.5rem;
  background-color: #f8fafc;
  font-style: italic;
}

.md blockquote p {
  margin: 0;
}

.md blockquote p:not(:last-child) {
  margin-bottom: 1rem;
}

/* Code blocks */
.md pre {
  overflow-x: auto;
}

.md pre code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.875rem;
  line-height: 1.7;
  display: block;
  background-color: #eee;
  color: #2d3748;
  padding: 0.8rem 1rem;
}

/* Inline code */
.md code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.875em;
}

.md p code {
  background-color: #f3fafc;
  color: #2d3748;
  padding: 0.2rem 0.4rem;
}

/* Images */
.md img {
  max-width: 100%;
  height: auto;
  margin: 1.5rem auto;
  border-radius: 6px;
}

/* Tables */
.md table {
  width: 100%;
  margin: 1.5rem 0;
  border-collapse: collapse;
  font-size: 1rem;
}

.md th,
.md td {
  padding: 0.75rem;
  border: 1px solid #e2e8f0;
  text-align: left;
}

.md th {
  background-color: #f8fafc;
  font-weight: 600;
}

.md tr:nth-child(even) {
  background-color: #f8fafc;
}

/* Horizontal rule */
.md hr {
  margin: 2rem 0;
  border: 0;
  height: 1px;
  background-color: #e2e8f0;
}

/* Emphasis */
.md strong {
  font-weight: 600;
}

.md em {
  font-style: italic;
}

/* Definition lists */
.md dl {
  margin: 1.5rem 0;
}

.md dt {
  font-weight: 600;
  margin-top: 1rem;
}

.md dd {
  margin-left: 1.5rem;
  margin-top: 0.5rem;
}

/* Footnotes */
.md .footnotes {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid #e2e8f0;
  font-size: 0.875rem;
}

/* Selection */
.md ::selection {
  background-color: lightyellow;
  color: orangered;
}