/* Practical Computer Use — blog styles.
   Light-first editorial page; tokens double for the dark scheme below. */

:root {
  --bg: #FCFCFA;
  --panel: #FFFFFF;
  --ink: #1E2422;
  --muted: #66716C;
  --line: #E4E7E3;
  --accent: #206E5E;
  --accent-soft: rgba(32, 110, 94, 0.07);
  --good: #206E5E;
  --bad: #B3462E;
  --serif: "Source Serif 4", Georgia, serif;
  --sans: "Schibsted Grotesk", "Helvetica Neue", Arial, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15191B;
    --panel: #1C2224;
    --ink: #E8ECEA;
    --muted: #97A5A0;
    --line: #2B3335;
    --accent: #6FB6A3;
    --accent-soft: rgba(111, 182, 163, 0.09);
    --good: #7CC4AE;
    --bad: #E08A6E;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.125rem;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

/* ---- chrome ---------------------------------------------------------- */
.masthead {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  max-width: 920px;
  margin: 0 auto;
  padding: 22px 24px;
  font-family: var(--sans);
}
.masthead .brand {
  font-weight: 700;
  letter-spacing: 0.22em;
  font-size: 0.95rem;
}
.masthead .brand span { color: var(--accent); }
.masthead .strand {
  color: var(--muted);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.rule { border: 0; border-top: 1px solid var(--line); margin: 0; }

footer {
  max-width: 720px;
  margin: 64px auto 0;
  padding: 28px 24px 56px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.85rem;
  line-height: 1.6;
}

/* ---- article --------------------------------------------------------- */
article {
  max-width: 720px;
  margin: 0 auto;
  padding: 56px 24px 0;
}
.eyebrow {
  font-family: var(--sans);
  color: var(--accent);
  font-weight: 600;
  font-size: 0.82rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  margin: 0 0 14px;
}
h1 {
  font-family: var(--sans);
  font-size: clamp(2rem, 5vw, 2.75rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 0 0 10px;
  text-wrap: balance;
}
.subtitle {
  font-family: var(--sans);
  font-size: clamp(1.15rem, 3vw, 1.4rem);
  color: var(--muted);
  font-weight: 500;
  margin: 0 0 22px;
  text-wrap: balance;
}
.byline {
  font-family: var(--sans);
  font-size: 0.88rem;
  color: var(--muted);
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  padding-bottom: 26px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 40px;
}
.byline b { color: var(--ink); font-weight: 600; }

h2 {
  font-family: var(--sans);
  font-size: 1.5rem;
  letter-spacing: -0.015em;
  line-height: 1.25;
  margin: 52px 0 14px;
  text-wrap: balance;
}
h3 {
  font-family: var(--sans);
  font-size: 1.08rem;
  margin: 32px 0 8px;
}
p { margin: 0 0 20px; }
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
strong { font-weight: 600; }
ul, ol { padding-left: 1.3em; margin: 0 0 20px; }
li { margin: 6px 0; }
.standfirst {
  font-size: 1.22rem;
  line-height: 1.65;
  color: var(--ink);
}
.aside {
  font-family: var(--sans);
  font-size: 0.95rem;
  color: var(--muted);
  border-left: 3px solid var(--line);
  padding: 2px 0 2px 18px;
  margin: 26px 0;
}
code {
  font-family: var(--mono);
  font-size: 0.85em;
  background: var(--accent-soft);
  border-radius: 4px;
  padding: 0.1em 0.35em;
}

/* ---- the ladder list -------------------------------------------------- */
.ladder { list-style: none; padding: 0; margin: 0 0 20px; }
.ladder li {
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 14px;
  padding: 10px 0;
  border-bottom: 1.5px dashed var(--muted);
}
.ladder li:last-child { border-bottom: 0; }
.ladder .rung {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.95rem;
}

/* ---- figures ---------------------------------------------------------- */
figure.breakout {
  width: min(920px, calc(100vw - 32px));
  /* 100% = the article's content box; negative margins center the breakout */
  margin: 30px calc((100% - min(920px, 100vw - 32px)) / 2) 34px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px 12px 8px;
}
@media (max-width: 800px) {
  figure.breakout { width: 100%; margin-left: 0; margin-right: 0; }
}
figure.breakout .plot { width: 100%; height: 560px; }
figcaption {
  font-family: var(--sans);
  font-size: 0.86rem;
  line-height: 1.55;
  color: var(--muted);
  padding: 10px 12px 12px;
}
figcaption b { color: var(--ink); }

/* example data point */
.example .frame {
  position: relative;
  border: 1px solid #000;
  border-radius: 8px;
  overflow: hidden;
}
.example .frame img { display: block; width: 100%; height: auto; }
/* portrait frames shrink to the image so the overlay percentages stay true */
.example .frame.portrait { width: fit-content; max-width: 100%; margin: 0 auto; }
.example .frame.portrait img { max-height: 640px; width: auto; }
.example .bbox {
  position: absolute;
  border: 2.5px solid #35D0AE;
  border-radius: 6px;
  box-shadow: 0 0 0 2000px rgba(10, 20, 17, 0.28);
}
.example .pt {
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #35D0AE;
  border: 2px solid #0c2a23;
  transform: translate(-50%, -50%);
}
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 12px;
}
@media (max-width: 700px) { .cards { grid-template-columns: 1fr; } }
.card {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 14px;
  background: var(--bg);
}
.card .tag {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  display: block;
  margin-bottom: 6px;
}
.card p {
  margin: 0;
  font-family: var(--sans);
  font-size: 0.95rem;
  line-height: 1.5;
}
/* several data points side by side, one compact card each */
.example .trio {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  align-items: start;
}
.trio .card { margin-top: 10px; }
.trio .card p { margin: 0 0 8px; font-size: 0.9rem; }
.trio .card p:last-child { margin-bottom: 0; }
.trio .card .tag { display: inline; margin: 0 6px 0 0; }
@media (max-width: 700px) {
  .example .trio { grid-template-columns: 1fr; }
  /* stacked frames shrink to the image, like the single-portrait case */
  .trio .frame { width: fit-content; max-width: 100%; margin: 0 auto; }
  .trio .frame img { max-height: 560px; width: auto; }
}

/* ---- appendix table ---------------------------------------------------- */
details {
  margin: 26px 0;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
}
summary {
  cursor: pointer;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 14px 18px;
}
.tablewrap { overflow-x: auto; padding: 0 8px 10px; }
table {
  border-collapse: collapse;
  width: 100%;
  min-width: 980px;
  font-family: var(--mono);
  font-size: 0.78rem;
  font-variant-numeric: tabular-nums;
}
th {
  font-family: var(--sans);
  font-size: 0.74rem;
  text-align: right;
  color: var(--muted);
  font-weight: 600;
  padding: 8px 10px 6px;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
th:first-child, td.seat { text-align: left; }
td { padding: 3px 10px; text-align: right; white-space: nowrap; }
td.seat { font-family: var(--sans); font-weight: 500; }
tr.delta td { background: var(--accent-soft); color: var(--muted); border-bottom: 1px solid var(--line); }
tr.cluster-break td { border-top: 2px solid var(--line); }
.chip { display: inline-block; width: 9px; height: 9px; border-radius: 3px; margin-right: 7px; }
.z { font-size: 0.68rem; color: var(--muted); }
.good { color: var(--good); font-weight: 600; }
.bad { color: var(--bad); font-weight: 600; }
.quiet { color: var(--muted); }

.footnotes {
  font-family: var(--sans);
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.6;
}