:root {
  --bg: #09131d;
  --bg-soft: #102536;
  --card: rgba(14, 30, 44, 0.88);
  --text: #e7f0f7;
  --muted: #abc1d2;
  --accent: #62ffd6;
  --accent-2: #8fb6ff;
  --border: rgba(169, 213, 245, 0.24);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: radial-gradient(circle at 20% 0%, #1d3852 0%, var(--bg) 45%), var(--bg);
  color: var(--text);
  font-family: Manrope, "Segoe UI", sans-serif;
}

.topbar, .container {
  width: min(1120px, 93vw);
  margin: 0 auto;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
}

.topbar a {
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
}

.topbar .colab { color: var(--accent); }

.hero { padding: 24px 0 8px; }

.kicker {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  font-size: 0.8rem;
  margin-bottom: 8px;
}

h1, h2, h3, h4 {
  font-family: "Space Grotesk", sans-serif;
  line-height: 1.2;
  margin-top: 0;
}

h1 { font-size: clamp(2rem, 4.2vw, 3.2rem); margin-bottom: 10px; }

.lead { color: var(--muted); max-width: 760px; margin-bottom: 20px; }

.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin-bottom: 22px;
}

.stats div {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
}

.stats span { display: block; font-size: 1.4rem; font-weight: 800; }
.stats small { color: var(--muted); }

.cells { display: grid; gap: 14px; padding-bottom: 40px; }

.cell-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
}

.cell-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
}

.badge {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 800;
  border-radius: 999px;
  padding: 5px 10px;
}

.badge-markdown { background: #8fb6ff; color: #06213f; }
.badge-code { background: var(--accent); color: #042c25; }

.cell-num { color: var(--muted); font-size: 0.9rem; }

.cell-markdown, .code-wrap, .outputs {
  padding: 14px;
}

.cell-markdown p, .cell-markdown li { color: var(--muted); }
.cell-markdown a { color: var(--accent-2); }

.cell-markdown code, .code-wrap code, .output-text pre {
  background: #0a1c2b;
  border: 1px solid rgba(122, 163, 196, 0.25);
  border-radius: 8px;
}

.code-wrap pre {
  margin: 0;
  white-space: pre-wrap;
  word-break: break-word;
}

.code-wrap code {
  display: block;
  color: #d9ecff;
  padding: 12px;
}

.plot {
  margin: 0 0 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  background: #08131d;
}

.plot img {
  display: block;
  width: 100%;
  height: auto;
}

.output-text pre {
  color: #cfe4f7;
  margin: 0;
  padding: 12px;
  white-space: pre-wrap;
}

@media (max-width: 860px) {
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}