/* ── Tokens ─────────────────────────────────────────────── */
:root{
  --paper:#F4F1E8;
  --paper-raised:#FBF9F4;
  --ink:#1B2A4A;
  --ink-soft:#4A5875;
  --rule:#D6D0C0;
  --annotate:#C1442E;
  --data-1:#2E6E63;
  --data-2:#B5761F;

  --print-paper:#fff;
  --print-ink:#000;
  --print-rule:#999;
  --print-dim:#555;

  --grid-dot:rgba(27,42,74,.07);
  --measure:68ch;
  --gutter:clamp(1.25rem,4vw,3.5rem);
  --plate-max:1120px;

  --serif:"IBM Plex Serif",Georgia,"Times New Roman",serif;
  --sans:"IBM Plex Sans",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:var(--sans);
  font-size:clamp(1rem,.96rem + .2vw,1.0625rem);
  line-height:1.65;
  color:var(--ink);
  background-color:var(--paper);
  background-image:radial-gradient(var(--grid-dot) 1px,transparent 1px);
  background-size:8px 8px;
  background-position:-1px -1px;
  overflow-x:clip;
}
img,svg{max-width:100%;height:auto;display:block}

/* ── Type ───────────────────────────────────────────────── */
h1,h2,h3,h4{font-family:var(--serif);font-weight:600;line-height:1.12;
  letter-spacing:-.01em;margin:0 0 .5em;text-wrap:balance}
h1{font-size:clamp(2.5rem,1.6rem + 4.4vw,5rem)}
h2{font-size:clamp(1.9rem,1.4rem + 2.4vw,3rem)}
h3{font-size:clamp(1.25rem,1.1rem + .8vw,1.6rem)}
p{margin:0 0 1.1em;max-width:var(--measure)}
a{color:var(--ink);text-decoration-thickness:1px;text-underline-offset:.18em}
a:focus-visible,button:focus-visible{outline:2px solid var(--annotate);
  outline-offset:3px;border-radius:2px}

.mono{font-family:var(--mono);font-size:.78rem;letter-spacing:.08em;
  text-transform:uppercase}

/* ── Plates ─────────────────────────────────────────────── */
.plate{max-width:var(--plate-max);margin-inline:auto;
  padding:clamp(3.5rem,8vw,7rem) var(--gutter);
  border-top:1px solid var(--rule)}
.plate:first-of-type{border-top:0}
.plate__number{font-family:var(--mono);font-size:.78rem;letter-spacing:.14em;
  color:var(--annotate);margin:0 0 1.25rem}
.plate__lede{font-size:clamp(1.1rem,1rem + .5vw,1.3rem);color:var(--ink-soft);
  max-width:56ch}
.margin-note{font-family:var(--mono);font-size:.72rem;line-height:1.5;
  color:var(--ink-soft);border-left:2px solid var(--annotate);
  padding-left:.75rem;margin:0}

.figure{background:var(--paper-raised);border:1px solid var(--rule);
  padding:clamp(1rem,3vw,2rem)}
.figure figcaption{font-family:var(--mono);font-size:.72rem;color:var(--ink-soft);
  margin-top:.9rem;line-height:1.5}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;
    transition-duration:.01ms!important;scroll-behavior:auto!important}
}

/* ── Masthead ───────────────────────────────────────────── */
.masthead{position:sticky;top:0;z-index:20;display:flex;flex-wrap:wrap;
  align-items:center;gap:1rem;padding:.75rem var(--gutter);
  background:color-mix(in srgb,var(--paper) 92%,transparent);
  backdrop-filter:blur(6px);border-bottom:1px solid var(--rule)}
.masthead__brand{display:block;color:var(--ink);flex:0 0 auto}
.masthead__brand img{width:min(260px,52vw);height:auto}
.masthead__toggle{margin-left:auto;background:none;border:1px solid var(--rule);
  color:var(--ink);padding:.45rem .8rem;border-radius:2px;cursor:pointer;
  font-family:var(--mono);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase}
.masthead__nav{display:none;width:100%;flex-direction:column;gap:.15rem;
  padding:.5rem 0 .25rem}
.masthead__nav.is-open{display:flex}
.masthead__nav a{display:flex;gap:.6rem;padding:.4rem 0;text-decoration:none;
  color:var(--ink-soft);font-size:.95rem}
.masthead__nav a:hover{color:var(--ink)}
.masthead__nav .mono{color:var(--annotate);font-size:.7rem;padding-top:.28em}

@media (min-width:900px){
  .masthead__toggle{display:none}
  .masthead__nav{display:flex;flex-direction:row;width:auto;margin-left:auto;
    gap:1.35rem;padding:0}
  .masthead__nav a{padding:0}
}

/* ── Cover ──────────────────────────────────────────────── */
.cover{padding-top:clamp(2.5rem,6vw,4.5rem)}
.cover__lede{font-size:clamp(1.15rem,1rem + .7vw,1.45rem);color:var(--ink-soft);
  max-width:46ch;margin-bottom:clamp(2rem,5vw,3.25rem)}
.cover__grid{display:grid;gap:clamp(1.25rem,3vw,2rem);
  grid-template-columns:1fr;align-items:start}
@media (min-width:820px){.cover__grid{grid-template-columns:1.35fr 1fr}}
.cover__shot img{width:100%}
.cover__video iframe{width:100%;aspect-ratio:9/16;max-height:70vh;border:0;
  background:var(--ink);border-radius:2px}
.cover__videocap{color:var(--ink-soft);margin:.6rem 0 0}

/* ── Plate 01: field note, stats, chart ────────────────── */
.field-note{margin:0 0 2rem;padding:1.25rem 1.5rem;background:var(--paper-raised);
  border-left:3px solid var(--annotate)}
.field-note p{margin:0 0 .75rem;font-family:var(--serif);
  font-size:clamp(1.05rem,1rem + .4vw,1.25rem);line-height:1.55}
.field-note cite{font-style:normal;color:var(--ink-soft);font-size:.72rem;
  letter-spacing:.08em;text-transform:uppercase}

.stat-row{display:grid;gap:1.25rem;grid-template-columns:1fr;margin:2.5rem 0;
  padding:1.5rem 0;border-block:1px solid var(--rule)}
@media (min-width:760px){.stat-row{grid-template-columns:repeat(3,1fr);gap:2rem}}
.stat__n{display:block;font-family:var(--serif);font-weight:600;
  font-size:clamp(1.9rem,1.5rem + 1.6vw,2.6rem);line-height:1;color:var(--annotate)}
.stat__l{display:block;margin-top:.5rem;font-size:.9rem;color:var(--ink-soft);
  max-width:32ch}

.chart{margin:2.5rem 0}
.chart svg{width:100%;height:auto}

/* ── Plate 02: exploded device diagram ─────────────────── */
.exploded{width:100%;max-width:420px;margin-inline:auto;color:var(--ink)}

@media (max-width:480px){
  /* nine callouts need every spare pixel at phone widths — trim the
     figure's own padding so the diagram (and its 10px labels) render
     larger than the default clamp(1rem,3vw,2rem) would allow */
  #device .figure:has(.exploded){padding:.6rem}
}

/* ── Plate 02b: component line art and parts grid ──────── */
.parts{list-style:none;padding:0;margin:2.5rem 0 0;display:grid;gap:1.5rem;
  grid-template-columns:1fr}
/* Nine parts: explicit column counts, never auto-fit — auto-fit gave four
   columns and left the ninth card orphaned on a row of its own. */
@media (min-width:560px){
  .parts{grid-template-columns:repeat(2,1fr)}
  .parts > li:last-child{grid-column:1 / -1}
}
@media (min-width:900px){
  .parts{grid-template-columns:repeat(3,1fr)}
  .parts > li:last-child{grid-column:auto}
}
.part{padding:1.15rem;background:var(--paper-raised);border:1px solid var(--rule)}
.part__art{width:64px;height:48px;color:var(--ink);margin-bottom:.75rem}
.part__name{font-family:var(--mono);font-size:.8rem;letter-spacing:.06em;
  text-transform:uppercase;margin:0 0 .35rem}
.part__role{font-size:.88rem;color:var(--ink-soft);margin:0}

/* ── Plate 03: operating sequence and firmware excerpts ─── */
.seq{list-style:none;padding:0;margin:2.5rem 0;counter-reset:none}
.seq__step{display:grid;gap:.25rem 1.25rem;grid-template-columns:auto 1fr;
  padding:1.35rem 0;border-top:1px solid var(--rule)}
.seq__step > .mono{color:var(--annotate);padding-top:.45em}
.seq__step h3{grid-column:2;margin:0 0 .3rem;font-size:1.15rem}
.seq__step p{grid-column:2;margin:0;color:var(--ink-soft)}

.code{margin:2rem 0;padding:0;overflow:hidden}
.code figcaption{color:var(--annotate);margin:0;padding:.9rem 1.15rem;
  border-bottom:1px solid var(--rule)}
.code pre{margin:0;padding:1.15rem;overflow-x:auto;background:var(--paper-raised)}
.code code{font-family:var(--mono);font-size:.8rem;line-height:1.7;color:var(--ink)}

/* ── Plate 04: cases and limitations grid ─────────────────── */
.cases{display:grid;gap:1.75rem;grid-template-columns:1fr;margin:2.25rem 0 3rem}
@media (min-width:800px){.cases{grid-template-columns:repeat(3,1fr);gap:2.25rem}}
.cases h3{font-size:1.15rem;margin-bottom:.4rem}
.cases p{color:var(--ink-soft);font-size:.94rem;margin:0}

.limits{padding:1.75rem;background:var(--paper-raised);
  border:1px solid var(--rule);border-left:3px solid var(--annotate)}
.limits h3{margin-top:0}
.limits__grid{display:grid;gap:1.5rem;grid-template-columns:1fr}
@media (min-width:760px){.limits__grid{grid-template-columns:1fr 1fr;gap:2rem}}
.limits h4{margin:0 0 .4rem;color:var(--annotate)}
.limits p{margin:0;color:var(--ink-soft);font-size:.92rem}

.countries{list-style:none;padding:0;margin:2.5rem 0 3rem;display:grid;gap:1.75rem;
  grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.countries h3{font-size:1.05rem;margin-bottom:.35rem;
  padding-bottom:.35rem;border-bottom:1px solid var(--rule)}
.countries p{font-size:.9rem;color:var(--ink-soft);margin:0}

/* ── Plate 06: the team ────────────────────────────────────── */
.roster{list-style:none;padding:0;margin:2.5rem 0 0;display:grid;gap:2rem;
  grid-template-columns:1fr}
@media (min-width:720px){.roster{grid-template-columns:repeat(3,1fr)}}
.roster--coach{margin-top:2.5rem;padding-top:2.5rem;border-top:1px solid var(--rule)}
@media (min-width:720px){.roster--coach{grid-template-columns:repeat(3,1fr)}
  .roster--coach .member{grid-column:2}}
.member{text-align:center}
.member img{width:150px;height:150px;border-radius:50%;object-fit:cover;
  margin:0 auto .9rem;border:1px solid var(--rule)}
.member h3{font-size:1.05rem;margin:0 0 .25rem}
.member .mono{color:var(--ink-soft);margin:0;text-transform:none;letter-spacing:.04em;
  font-size:.75rem}

/* ── Colophon ──────────────────────────────────────────── */
.colophon{border-top:1px solid var(--rule);background:var(--paper-raised);
  margin-top:clamp(3rem,8vw,6rem)}
.colophon__inner{max-width:var(--plate-max);margin-inline:auto;
  padding:clamp(2.5rem,6vw,4rem) var(--gutter);text-align:center}
.colophon__mark{margin:0 auto 1.1rem;color:var(--ink);opacity:.8}
.colophon__motto{font-family:var(--serif);font-size:1.35rem;margin:0 0 1rem;
  max-width:none}
.colophon .mono{color:var(--ink-soft);text-transform:none;letter-spacing:.03em;
  line-height:1.8;max-width:none}
.sources{margin-top:2rem;text-align:left;max-width:44rem;margin-inline:auto}
.sources summary{cursor:pointer;color:var(--annotate);padding:.5rem 0}
.sources ul{margin:.5rem 0 0;padding-left:1.1rem;color:var(--ink-soft);font-size:.85rem;
  line-height:1.9}

/* ── Skip link & scroll behaviour ──────────────────────── */
.skip{position:absolute;left:-9999px;top:0;z-index:50;background:var(--ink);
  color:var(--paper);padding:.6rem 1rem}
.skip:focus{left:.5rem;top:.5rem}
@media (prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}
html{scroll-padding-top:5rem}

/* ── Print ──────────────────────────────────────────────── */
@media print{
  @page{margin:18mm}
  body{background:var(--print-paper);color:var(--print-ink);font-size:10.5pt}
  .masthead,.skip,.cover__video,.sources summary{display:none}
  .sources[open] ul,.sources ul{display:block}
  .plate{page-break-inside:avoid;padding:0 0 14mm;max-width:none;
    border-top:.5pt solid var(--print-rule)}
  .figure,.seq__step,.member,.part{page-break-inside:avoid}
  a[href^="http"]::after{content:" (" attr(href) ")";font-size:8pt;color:var(--print-dim)}
  .plate__number,.stat__n,.limits h4,.sources summary{color:var(--print-ink)}
}