:root {
  --bg: #fbfaf7;
  --fg: #1d1c1a;
  --muted: #6b675f;
  --line: #e4e0d8;
  --card: #ffffff;
  --accent: #d9480f;
  --accent-soft: #fff1e8;
  --code: #f3f0ea;
  --serif: "Iowan Old Style", "Charter", "Georgia", "Apple SD Gothic Neo", "Noto Serif KR", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141412;
    --fg: #ece9e2;
    --muted: #9b968c;
    --line: #2d2b27;
    --card: #1c1b18;
    --accent: #ff8a4c;
    --accent-soft: #2a1d15;
    --code: #22211d;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 19px/1.65 var(--serif);
}
a { color: var(--accent); text-underline-offset: 3px; }
.wrap { max-width: 700px; margin: 0 auto; padding: 0 22px; }
header.site {
  padding: 28px 0 8px;
  font-family: var(--sans);
  font-size: 15px;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}
header.site a { color: var(--fg); text-decoration: none; font-weight: 650; }
header.site nav a { color: var(--muted); font-weight: 400; margin-left: 16px; }
footer.site {
  margin: 72px 0 40px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font: 14px/1.5 var(--sans);
  color: var(--muted);
}
h1, h2, h3 { font-family: var(--sans); line-height: 1.2; letter-spacing: -0.015em; }
h1 { font-size: 2.1rem; margin: 40px 0 10px; }
h2 { font-size: 1.4rem; margin: 56px 0 8px; }
h3 { font-size: 1.1rem; margin: 32px 0 4px; }
.dek { font-size: 1.15rem; color: var(--muted); margin: 0 0 8px; }
.meta { font: 14px var(--sans); color: var(--muted); margin-bottom: 36px; }
p, ul, ol { margin: 0 0 1.1em; }
li { margin: 0.25em 0; }
strong { font-weight: 650; }
code {
  font: 0.84em var(--mono);
  background: var(--code);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}
pre {
  font: 14px/1.5 var(--mono);
  background: var(--code);
  padding: 14px 16px;
  border-radius: 10px;
  overflow-x: auto;
}
pre code { background: none; padding: 0; }
blockquote {
  margin: 1.4em 0;
  padding: 2px 0 2px 18px;
  border-left: 3px solid var(--accent);
  color: var(--muted);
  font-style: italic;
}
hr { border: 0; border-top: 1px solid var(--line); margin: 48px 0; }
figure { margin: 28px 0; }
figure img, figure video {
  width: 100%;
  height: auto;
  border-radius: 12px;
  border: 1px solid var(--line);
  display: block;
}
figure.phone img, figure.phone video { max-width: 360px; margin: 0 auto; }
figcaption {
  font: 14px/1.45 var(--sans);
  color: var(--muted);
  margin-top: 8px;
  text-align: center;
}
.tldr {
  font: 16px/1.55 var(--sans);
  background: var(--accent-soft);
  border-radius: 12px;
  padding: 16px 20px;
  margin: 0 0 32px;
}
.tldr ul { margin: 6px 0 0; padding-left: 20px; }
.numbers {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 10px;
  margin: 24px 0 28px;
  font-family: var(--sans);
}
.numbers div {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 14px;
}
.numbers b { display: block; font-size: 1.5rem; letter-spacing: -0.02em; }
.numbers span { font-size: 13px; color: var(--muted); line-height: 1.35; display: block; }

/* Audio clips */
.clip {
  font-family: var(--sans);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 14px 10px;
  margin: 14px 0;
}
.clip p { margin: 0 0 8px; font-size: 15px; line-height: 1.45; }
.clip p small { color: var(--muted); display: block; font-size: 13px; }
.clip audio { width: 100%; height: 40px; }

/* Diagrams: HTML boxes that stack on phones */
.diagram {
  font: 14px/1.35 var(--sans);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px 14px;
  margin: 28px 0 8px;
}
.diagram + figcaption, .diagram-cap { font: 14px/1.45 var(--sans); color: var(--muted); text-align: center; margin: 0 0 28px; }
.flow { display: flex; flex-direction: column; align-items: stretch; gap: 0; }
.flow .row { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; }
.box {
  border: 1.5px solid var(--fg);
  border-radius: 9px;
  padding: 8px 10px;
  text-align: center;
  background: var(--bg);
  flex: 1 1 0;
  min-width: 120px;
  max-width: 320px;
}
.box b { display: block; font-size: 14px; }
.box small { display: block; color: var(--muted); font-size: 12px; margin-top: 2px; }
.box.hot { border-color: var(--accent); background: var(--accent-soft); }
.box.ghost { border-style: dashed; }
.arrow {
  text-align: center;
  color: var(--muted);
  font-size: 12px;
  padding: 4px 12px 8px;
  line-height: 1.3;
}
.arrow::before { content: "↓"; display: block; font-size: 17px; color: var(--fg); }
.arrow.up::before { content: "↑"; }
.arrow.both::before { content: "↕"; }
.group {
  border: 1px dashed var(--muted);
  border-radius: 12px;
  padding: 8px 10px 10px;
  margin: 4px 0;
}
.group > .label {
  display: block;
  margin: 0 2px 8px;
  line-height: 1.3;
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}
.timeline { font: 14px/1.4 var(--sans); margin: 24px 0; }
.timeline .t { display: grid; grid-template-columns: 74px 1fr; gap: 10px; padding: 6px 0; border-bottom: 1px solid var(--line); }
.timeline .t b { font-variant-numeric: tabular-nums; color: var(--accent); }

/* Index */
.posts { list-style: none; padding: 0; margin: 32px 0; }
.posts li { margin: 0 0 26px; }
.posts a { font: 650 1.25rem/1.3 var(--sans); color: var(--fg); text-decoration: none; }
.posts a:hover { color: var(--accent); }
.posts p { margin: 4px 0 0; color: var(--muted); font-size: 17px; }
.posts time { font: 13px var(--sans); color: var(--muted); }

@media (max-width: 520px) {
  body { font-size: 18px; }
  h1 { font-size: 1.75rem; }
  .box { min-width: 0; flex-basis: 100%; }
  .flow .row { flex-direction: column; align-items: stretch; }
  .box { max-width: none; }
}

table.data { width: 100%; border-collapse: collapse; font: 13.5px/1.35 var(--sans); margin: 0 0 1.2em; }
table.data th { text-align: left; font-weight: 600; color: var(--muted); border-bottom: 1px solid var(--line); padding: 4px 8px 6px 0; vertical-align: bottom; }
table.data td { padding: 6px 8px 6px 0; border-bottom: 1px solid var(--line); vertical-align: top; }
table.data td.n, table.data th.n { text-align: right; white-space: nowrap; font-variant-numeric: tabular-nums; }
.bar { display: flex; height: 30px; border-radius: 8px; overflow: hidden; }
.legend { display: flex; flex-wrap: wrap; gap: 4px 14px; font: 13px/1.4 var(--sans); margin-top: 10px; }
.legend i { display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: 6px; vertical-align: -1px; }