/* One stylesheet, no framework, no external requests. The page has to be fast
   for someone on a phone who just wants a PDF. */

:root {
  color-scheme: light dark;

  /* Light is the base. Both themes redefine these same names, so no colour is
     ever defined only inside a media query. */
  --bg: #fbfbf9;
  --panel: #ffffff;
  --ink: #1b1b1a;
  --ink-soft: #55554f;
  --rule: #e2e1db;
  --accent: #8a3a2c;
  --accent-ink: #ffffff;
  --warn-bg: #fdf6e6;
  --warn-rule: #e6d3a3;
  --shadow: 0 1px 2px rgba(0, 0, 0, .05), 0 8px 24px rgba(0, 0, 0, .06);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16171a;
    --panel: #1e2024;
    --ink: #e8e8e4;
    --ink-soft: #a2a49e;
    --rule: #313339;
    --accent: #e08a72;
    --accent-ink: #1b1b1a;
    --warn-bg: #262218;
    --warn-rule: #4d4227;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 8px 24px rgba(0, 0, 0, .35);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0 1.25rem 5rem;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        "Helvetica Neue", Arial, sans-serif;
  -webkit-text-size-adjust: 100%;
}

main, header, footer { max-width: 34rem; margin: 0 auto; }

/* Figures are allowed to break the measure, but they scroll inside their own
   box rather than pushing the page sideways. */
.wide { max-width: 60rem; }

h1 {
  font-size: clamp(1.9rem, 6vw, 2.6rem);
  line-height: 1.15;
  letter-spacing: -.02em;
  margin: 2.5rem 0 .5rem;
}
h2 {
  font-size: 1.3rem;
  letter-spacing: -.01em;
  margin: 3rem 0 .75rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
}
h2:first-of-type { border-top: 0; padding-top: 0; }
h3 { font-size: 1.02rem; margin: 1.75rem 0 .4rem; }

p { margin: 0 0 1rem; }
.lede { font-size: 1.1rem; color: var(--ink-soft); }
.soft { color: var(--ink-soft); }
.small { font-size: .9rem; }

a { color: var(--accent); text-underline-offset: .15em; }
a:hover { text-decoration-thickness: 2px; }

img { max-width: 100%; height: auto; display: block; }

figure { margin: 1.5rem 0; }
figure .scroll { overflow-x: auto; border: 1px solid var(--rule); border-radius: 10px;
                 background: var(--panel); }
figure img { border-radius: 9px; }
figcaption { margin-top: .6rem; font-size: .9rem; color: var(--ink-soft); }

/* Dense figures — the plotted ones — stay legible by scrolling inside their
   own box rather than shrinking to illegibility. min() rather than a media
   query so it is self-limiting: on a narrow screen the floor collapses to the
   container width and the page cannot be pushed sideways. A plain 34rem here
   forced the whole layout wider than a phone. */
figure.detail img { min-width: min(34rem, 100%); }

/* --- Downloads ---------------------------------------------------------- */

.downloads { display: flex; flex-wrap: wrap; gap: .75rem; margin: 1.5rem 0 .75rem; }

.btn {
  display: block;
  flex: 1 1 13rem;
  min-width: 0;
  padding: .85rem 1.1rem;
  border: 1px solid var(--rule);
  border-radius: 10px;
  background: var(--panel);
  color: var(--ink);
  text-decoration: none;
  box-shadow: var(--shadow);
}
.btn b { display: block; font-size: 1.02rem; }
.btn span { font-size: .84rem; color: var(--ink-soft); }
.btn:hover { border-color: var(--accent); }

/* Set by a few lines of script once the platform is known. Everything works
   without it — this only changes which button looks like the obvious one. */
.btn.suggested {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}
.btn.suggested span { color: var(--accent-ink); opacity: .85; }

.note {
  margin: 1.5rem 0;
  padding: 1rem 1.15rem;
  background: var(--warn-bg);
  border: 1px solid var(--warn-rule);
  border-radius: 10px;
  font-size: .95rem;
}
.note p:last-child, .note ul:last-child { margin-bottom: 0; }
.note ul { margin: .5rem 0 0; padding-left: 1.1rem; }
.note li { margin: .35rem 0; }

code, kbd {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .88em;
  /* The install line is one unbreakable token wider than a phone. Without
     this it is the only thing on the page that can push the body sideways. */
  overflow-wrap: anywhere;
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 5px;
  padding: .1em .35em;
}
pre {
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 10px;
  padding: .9rem 1rem;
  overflow-x: auto;
}
pre code { background: none; border: 0; padding: 0; }

ul.plain { list-style: none; padding: 0; }
ul.plain li { padding-left: 1.4rem; position: relative; margin: .5rem 0; }
ul.plain li::before { content: "→"; position: absolute; left: 0; color: var(--accent); }

footer {
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  font-size: .92rem;
  color: var(--ink-soft);
}

@media (max-width: 40rem) {
  figure .scroll { border: 0; background: none; }
}