:root {
  --bg: #f4f2ec;
  --ink: #161616;
  --muted: #66707a;
  --line: #ddd8ce;
  --panel: #fffdf8;
  --ok: #1f7a4c;
  --bad: #b44a28;
  --accent: #2c5aa0;
  --serif: "Source Serif 4", Georgia, serif;
  --mono: "IBM Plex Mono", Menlo, monospace;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background:
    radial-gradient(900px 500px at 0% 0%, #e8eee6 0%, transparent 55%),
    radial-gradient(700px 400px at 100% 10%, #eee6dc 0%, transparent 50%),
    var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.12rem;
  line-height: 1.55;
}

.post {
  max-width: 44rem;
  margin: 0 auto;
  padding: 2.75rem 1.25rem 4rem;
}

header { margin-bottom: 2rem; }
.kicker {
  margin: 0 0 0.6rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.9rem, 5vw, 2.55rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
}
.deck { margin: 0 0 1rem; color: var(--muted); font-size: 1.12rem; }
.by { margin: 0; font-size: 0.92rem; color: var(--muted); }
.mono { font-family: var(--mono); font-size: 0.86em; }

section { padding: 1.35rem 0 0.4rem; }
section + section { border-top: 1px solid var(--line); margin-top: 1.4rem; padding-top: 1.6rem; }

h2 {
  margin: 0 0 0.7rem;
  font-size: 1.28rem;
  letter-spacing: -0.015em;
}

p { margin: 0 0 0.9rem; }
.rule {
  border-left: 3px solid var(--ok);
  padding-left: 0.9rem;
  font-weight: 600;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 0.85rem;
  margin: 0.75rem 0 0.5rem;
}

.cap {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--muted);
  margin: 0.35rem 0 0;
}

.grid4 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin: 0.75rem 0;
}
@media (max-width: 640px) {
  .grid4 { grid-template-columns: 1fr; }
}

.ex {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 0.55rem 0.6rem 0.4rem;
}
.ex h3 {
  margin: 0 0 0.35rem;
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 500;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.ex canvas { width: 100%; height: auto; display: block; }
.ex .meta {
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--muted);
  margin-top: 0.25rem;
}

.slide {
  display: grid;
  grid-template-columns: 5.5rem 1fr 3.2rem;
  gap: 0.6rem;
  align-items: center;
  margin-top: 0.85rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--muted);
}
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 2px;
  background: #cfc9bd;
  outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid #fff;
  cursor: pointer;
}

.stats {
  margin-top: 0.75rem;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.5rem;
  font-family: var(--mono);
  font-size: 0.78rem;
}
@media (max-width: 640px) {
  .stats { grid-template-columns: 1fr 1fr; }
}
.stats div {
  background: #f7f4ee;
  border: 1px solid var(--line);
  padding: 0.55rem 0.6rem;
  border-radius: 2px;
}
.stats b {
  display: block;
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--ink);
  margin-top: 0.15rem;
}

ul {
  margin: 0 0 1rem;
  padding-left: 1.15rem;
}
li { margin: 0.35rem 0; }

footer {
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.95rem;
}
footer a {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 2px;
}
footer a:hover { color: var(--ok); }