:root {
  --bg: #0c0c0e;
  --bg-2: #131316;
  --fg: #e8e6e3;
  --muted: #7a7a82;
  --dim: #4a4a52;
  --border: #1f1f24;
  --accent: #f0a868;
  --accent-soft: rgba(240, 168, 104, 0.12);
  --accent-press: #1a0e02;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--fg); }
body {
  font-family: "JetBrains Mono", ui-monospace, Menlo, Consolas, monospace;
  font-size: 15px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

.topbar {
  border-bottom: 1px solid var(--border);
  padding: 0.875rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8125rem;
  color: var(--muted);
  position: sticky; top: 0;
  background: var(--bg);
  z-index: 10;
}
.topbar .label { color: var(--accent); }
.topbar a { color: var(--muted); }
.topbar a:hover { color: var(--fg); text-decoration: none; }

main { max-width: 64rem; margin: 0 auto; padding: 3rem 1.5rem 4rem; }

section { margin-bottom: 4rem; }
.sec-label {
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-bottom: 1rem;
}
.sec-label::before { content: "── "; color: var(--dim); }

h1.hero {
  font-size: clamp(2rem, 4.5vw, 3.25rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin: 0 0 1.25rem;
}
h1.hero .accent { color: var(--accent); }
h2 {
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 1rem;
}
h3 { font-size: 1rem; font-weight: 600; margin: 0 0 0.5rem; letter-spacing: 0.02em; }
p { margin: 0 0 0.75rem; }
p.lead { color: var(--fg); font-size: 1.0625rem; }
p.muted { color: var(--muted); }

.hero-block {
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2.5rem 2rem;
  background:
    radial-gradient(ellipse at top left, rgba(240,168,104,0.05), transparent 60%),
    var(--bg);
}
.prompt::before { content: "> "; color: var(--accent); }
.meta-line { color: var(--muted); font-size: 0.875rem; margin-bottom: 0.5rem; }
.cta-row { display: flex; gap: 0.75rem; align-items: center; margin-top: 1.5rem; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font: inherit;
  font-weight: 500;
  padding: 0.625rem 1rem;
  background: var(--accent);
  color: var(--accent-press);
  border: 1px solid var(--accent);
  border-radius: 3px;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s, transform 0.05s;
}
.btn:hover { background: #ffbd83; text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn-ghost {
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--border);
}
.btn-ghost:hover { border-color: var(--muted); background: var(--bg-2); }

ul.features { list-style: none; padding: 0; margin: 0; }
ul.features li {
  padding: 0.875rem 0;
  border-top: 1px dashed var(--border);
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: 1rem;
  align-items: baseline;
}
ul.features li:last-child { border-bottom: 1px dashed var(--border); }
ul.features .num { color: var(--accent); font-size: 0.8125rem; }

.authors { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 720px) { .authors { grid-template-columns: 1fr; } }
.author {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 1.25rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1.25rem;
}
.author .photo {
  width: 180px;
  height: 240px;
  object-fit: cover;
  border-radius: 4px;
  display: block;
}
.author .info { min-width: 0; }
.author ul { padding: 0; margin: 0; list-style: none; color: var(--muted); font-size: 0.875rem; }
.author ul li { padding: 0.125rem 0; }
.author ul li::before { content: "· "; color: var(--dim); }
.author a { color: var(--accent); }

.course {
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1.75rem 1.5rem;
}
.course .meta { color: var(--accent); font-size: 0.8125rem; margin-bottom: 0.5rem; }
.course h2 { margin-bottom: 0.75rem; }
.course .summary { color: var(--fg); margin-bottom: 1rem; }
.course .col-title {
  color: var(--muted);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  margin: 1.5rem 0 0.5rem;
  text-transform: lowercase;
}
.course .col-title::before { content: "── "; color: var(--dim); }
.course ol {
  padding-left: 1.5rem;
  margin: 0.5rem 0;
  color: var(--muted);
  font-size: 0.875rem;
  columns: 2;
  column-gap: 1.5rem;
}
@media (max-width: 720px) { .course ol { columns: 1; } }
.course ol li { padding: 0.125rem 0; break-inside: avoid; }
.course ul.simple {
  padding: 0;
  margin: 0.5rem 0;
  list-style: none;
  color: var(--muted);
  font-size: 0.875rem;
}
.course ul.simple li { padding: 0.125rem 0; }
.course ul.simple li::before { content: "· "; color: var(--dim); }
.course .formats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin: 0.75rem 0 1.25rem;
}
@media (max-width: 720px) { .course .formats { grid-template-columns: 1fr; } }
.course .format-card {
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.75rem 0.875rem;
}
.course .format-card .label {
  color: var(--accent);
  font-size: 0.75rem;
  margin-bottom: 0.25rem;
}
.course .format-card .value { color: var(--fg); font-size: 0.875rem; line-height: 1.5; }

footer.site {
  border-top: 1px solid var(--border);
  margin-top: 4rem;
  padding-top: 1.5rem;
  color: var(--muted);
  font-size: 0.8125rem;
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: space-between;
}
footer.site a { color: var(--muted); }
footer.site a:hover { color: var(--fg); }