:root {
  --bg: #061529;
  --panel: #0b2440;
  --text: #e6f0ff;
  --muted: #9bb3d1;
  --accent: #3ea6ff;
  --radius: 12px;
  font-family: "Inter", system-ui, sans-serif;
}

body {
  margin: 0;
  background: linear-gradient(180deg, #04111f, #061529);
  color: var(--text);
}

.container {
  max-width: 1200px;
  margin: auto;
  padding: 24px;
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 24px;
}

/* TOC */
.toc {
  background: var(--panel);
  padding: 20px;
  border-radius: var(--radius);
  position: sticky;
  top: 20px;
}

.toc h1 {
  font-size: 1.2rem;
  color: var(--accent);
}

.toc a {
  display: block;
  padding: 10px;
  margin-top: 6px;
  color: var(--muted);
  text-decoration: none;
  border-radius: 8px;
}

.toc a:hover {
  background: rgba(62,166,255,0.12);
  color: var(--accent);
}

/* Content */
.content {
  background: rgba(255,255,255,0.03);
  padding: 28px;
  border-radius: var(--radius);
}

h2 {
  color: #ffffff;
}

p {
  line-height: 1.7;
  color: var(--muted);
}

a {
  color: var(--accent);
}

/* Responsive */
@media (max-width: 900px) {
  .container {
    grid-template-columns: 1fr;
  }
  .toc {
    position: relative;
  }
}