body {
  margin: 0;
  background: #0f172a;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #e2e8f0;
}

/* HERO */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
}

.card {
  background: #1e293b;
  color: #e2e8f0;
  padding: 3rem 4rem;
  border-radius: 1rem;
  text-align: center;
  box-shadow: 0 10px 30px rgba(0,0,0,0.4);
  max-width: 480px;
}

h1 {
  margin: 0 0 0.5rem;
  font-size: 2rem;
}

.tagline {
  color: #9ca3af;
  margin-bottom: 1.5rem;
}

hr {
  border: none;
  border-top: 1px solid #475569;
  margin: 1.5rem 0;
}

.build-info {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  margin-top: 1rem;
  font-size: 0.9rem;
  color: #e2e8f0;
}

.build-info td {
  padding: 0.4rem 0;
}

.build-info td:first-child {
  width: 130px;
  color: #9ca3af;
  font-weight: 600;
}

/* SECTIONS */
.section {
  max-width: 800px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
  border-top: 1px solid #1e293b;
}

.section h2 {
  font-size: 1.5rem;
  margin-bottom: 1.5rem;
  color: #38bdf8;
}

.section h3 {
  font-size: 1.05rem;
  color: #9ca3af;
  margin: 1.5rem 0 0.5rem;
}

/* GRID / PILLS */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.pill {
  background: #1e293b;
  border-radius: 0.75rem;
  padding: 1rem 1.25rem;
  font-size: 0.9rem;
  border-left: 3px solid #38bdf8;
}

/* DIAGRAMS */
.diagram {
  background: #1e293b;
  border-radius: 0.75rem;
  padding: 1.25rem;
  font-size: 0.85rem;
  line-height: 1.5;
  overflow-x: auto;
  color: #a5b4fc;
  white-space: pre;
}

/* STACK TABLE */
.stack-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.stack-table tr {
  border-bottom: 1px solid #1e293b;
}

.stack-table td {
  padding: 0.6rem 0.5rem;
}

.stack-table td:first-child {
  width: 180px;
  color: #38bdf8;
  font-weight: 600;
}

/* LISTS */
.decisions, .roadmap {
  padding-left: 1.2rem;
  font-size: 0.92rem;
  line-height: 1.7;
}

.decisions code, .roadmap code {
  background: #1e293b;
  padding: 0.1rem 0.4rem;
  border-radius: 0.3rem;
  font-size: 0.85rem;
  color: #a5b4fc;
}

.roadmap li {
  color: #cbd5e1;
}

/* FOOTER */
.footer {
  text-align: center;
  padding: 2rem 1rem 3rem;
  color: #64748b;
  font-size: 0.85rem;
}

.footer a {
  color: #38bdf8;
  text-decoration: none;
}

.footer a:hover {
  text-decoration: underline;
}