.about-main {
  max-width: 880px;
  margin: 32px auto;
  padding: 0 24px;
}

.about-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 32px;
}

.about-card h1 {
  margin: 0 0 16px;
  font-size: 28px;
  font-weight: 600;
}

.about-card h2 {
  margin: 28px 0 12px;
  font-size: 18px;
  font-weight: 600;
  color: var(--accent);
}

.about-card .lede {
  color: var(--muted);
  font-size: 15px;
  line-height: 1.6;
  margin: 0 0 12px;
}

.about-card p,
.about-card li {
  line-height: 1.6;
}

.about-card ul {
  padding-left: 22px;
}

.about-card li {
  margin-bottom: 6px;
}

.about-card code {
  background: var(--bg);
  padding: 1px 6px;
  border-radius: 3px;
  font-size: 13px;
}

.diagram {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 16px;
  font-size: 12.5px;
  line-height: 1.4;
  overflow-x: auto;
}

table.stack {
  border-collapse: collapse;
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
}

table.stack th,
table.stack td {
  padding: 8px 12px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

table.stack th {
  background: #1c232d;
  font-size: 12px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

table.stack tr:last-child td {
  border-bottom: 0;
}

.github-link {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}

.github-link:hover {
  text-decoration: underline;
}

.repo-meta {
  color: var(--muted);
  font-size: 14px;
}

.topbar a.tab-btn,
.topbar a.link {
  text-decoration: none;
}