:root {
  --tn-blue: #2563EB;
  --tn-purple: #7C3AED;
  --tn-text: #0F172A;
  --tn-text-secondary: #64748B;
  --tn-bg: #F8FAFC;
  --tn-card: #FFFFFF;
  --tn-border: #E2E8F0;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--tn-bg);
  color: var(--tn-text);
  line-height: 1.6;
}
.tn-header {
  padding: 20px 20px 0;
  max-width: 760px;
  margin: 0 auto;
}
.tn-brand {
  font-weight: 800;
  font-size: 20px;
  text-decoration: none;
  background: linear-gradient(90deg, var(--tn-blue), var(--tn-purple));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.tn-container {
  max-width: 760px;
  margin: 0 auto;
  padding: 24px 20px 64px;
}
.tn-card {
  background: var(--tn-card);
  border: 1px solid var(--tn-border);
  border-radius: 16px;
  padding: 28px 28px 8px;
}
h1 {
  font-size: 26px;
  font-weight: 800;
  margin: 0 0 6px;
}
.tn-meta {
  color: var(--tn-text-secondary);
  font-size: 13px;
  margin: 0 0 18px;
}
.tn-intro {
  margin: 0 0 26px;
  color: var(--tn-text);
}
section {
  margin-bottom: 22px;
}
section h2 {
  font-size: 15px;
  font-weight: 700;
  margin: 0 0 6px;
}
section p {
  margin: 0;
  color: var(--tn-text);
}
.tn-links {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 20px 40px;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
}
.tn-links a {
  color: var(--tn-blue);
  text-decoration: none;
}
.tn-links a:hover { text-decoration: underline; }