/* ageation site — same family as the probability course site (same layout,
   typography, and components), with its own accent hue. */
:root {
  --ink: #1a1a2e;
  --muted: #5b6472;
  --accent: #2f8a5d;
  --accent-soft: #e8f8f0;
  --line: #dfe3e8;
  --bg: #ffffff;
  --card: #f7f9fb;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.55;
}
a { color: var(--accent); }

/* ---- shared top nav ---- */
.nav {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; flex-wrap: wrap;
  padding: .85rem 1.25rem; border-bottom: 1px solid var(--line);
}
.nav .brand { font-weight: 700; font-size: 1.15rem; color: var(--ink); text-decoration: none; letter-spacing: -0.01em; }
.nav .links { display: flex; gap: .25rem; flex-wrap: wrap; }
.nav .links a {
  padding: .35rem .75rem; border-radius: 999px; text-decoration: none;
  color: var(--muted); font-size: .92rem; font-weight: 550;
}
.nav .links a:hover { background: var(--card); color: var(--ink); }
.nav .links a[aria-current="page"] { background: var(--accent-soft); color: var(--accent); }

/* ---- landing / About page ---- */
.wrap { max-width: 820px; margin: 0 auto; padding: 2.25rem 1.25rem 4rem; }
.hero h1 { font-size: 2.1rem; margin: 0 0 .4rem; letter-spacing: -0.02em; }
.hero .lead { font-size: 1.1rem; color: #333b45; margin: 0 0 1.1rem; }
.desc { margin: 0 0 1rem; color: #2a2f38; }
.section-title {
  font-size: .82rem; text-transform: uppercase; letter-spacing: .08em;
  color: var(--accent); font-weight: 700; margin: 2.5rem 0 1.1rem;
}
.objectives { counter-reset: obj; list-style: none; padding: 0; margin: 0; }
.objectives li { position: relative; padding: 0 0 1.15rem 2.7rem; margin: 0; color: #2a2f38; }
.objectives li::before {
  counter-increment: obj; content: counter(obj);
  position: absolute; left: 0; top: .05rem;
  width: 1.75rem; height: 1.75rem; border-radius: 50%;
  background: var(--accent-soft); color: var(--accent);
  font-weight: 700; font-size: .85rem;
  display: flex; align-items: center; justify-content: center;
}
.cta { display: flex; gap: .7rem; flex-wrap: wrap; margin-top: 2.25rem; }
.cta a {
  display: inline-flex; align-items: center; gap: .4rem;
  padding: .6rem 1.15rem; border-radius: 8px; text-decoration: none;
  font-weight: 600; font-size: .95rem;
}
.cta a.primary { background: var(--accent); color: #fff; }
.cta a.primary:hover { background: #226b46; }
.cta a.secondary { border: 1px solid var(--line); color: var(--ink); background: var(--card); }
.cta a.secondary:hover { border-color: var(--accent); }

/* ---- the "why now" syllogism ---- */
.syllogism {
  display: flex; flex-direction: column; gap: .55rem;
  margin: 0 0 1.25rem;
}
.syllogism .claim {
  background: var(--card); border: 1px solid var(--line);
  border-radius: 10px; padding: .7rem 1rem;
  font-size: 1.02rem; color: #2a2f38;
}
.syllogism .claim .term { font-weight: 700; color: var(--ink); }
.syllogism .claim a.term { color: var(--accent); text-decoration: none; }
.syllogism .claim a.term:hover { text-decoration: underline; }
.syllogism .conclusion {
  background: var(--accent-soft); border-color: var(--accent);
  color: var(--ink); font-weight: 600;
}

/* ---- how-to page ---- */
pre.code, pre.tree {
  background: var(--card); border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: 8px; padding: .85rem 1.1rem;
  overflow-x: auto; margin: 0 0 1.1rem;
}
pre.code code, pre.tree code {
  font-family: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .88rem; color: var(--ink); line-height: 1.6;
}
pre.tree { border-left-color: var(--line); }
p.desc code, li code {
  font-family: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .88em; background: var(--card);
  border: 1px solid var(--line); border-radius: 4px; padding: .05em .35em;
}
.aside { font-size: .88rem; color: var(--muted); margin: -0.4rem 0 1.1rem; }

/* ---- showcase page ---- */
.example { margin: 0 0 2.25rem; }
.clip {
  display: block; max-width: 360px;
  border: 1px solid var(--line); border-radius: 12px; overflow: hidden;
  text-decoration: none;
  transition: border-color .15s ease, transform .15s ease, box-shadow .15s ease;
}
.clip:hover {
  border-color: var(--accent); transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(26, 26, 46, .09);
}
.clip img { display: block; width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }