:root{
  --paper:#ffffff;
  --ink:#1a1c21;
  --soft:#565c66;
  --faint:#9aa1ab;
  --line:#e3e6ec;
  --panel:#f7f8fa;
  --accent:#8B1400;
  --accent-tint:#fbf1ef;
  --gold:#8a6d24;
  --maxw:760px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0; background:var(--paper); color:var(--ink);
  font-family:"Charter","Iowan Old Style",Georgia,serif;
  font-size:17.5px; line-height:1.62;
  -webkit-font-smoothing:antialiased;
}
.wrap{max-width:var(--maxw); margin:0 auto; padding:0 28px}

/* ---------- title page ---------- */
.title-page{
  display:flex; flex-direction:column;
  justify-content:center; border-bottom:1px solid var(--line);
  margin-bottom:56px; padding:48px 0 34px;
}
.title-page h1{
  font-size:56px; line-height:1.02; margin:0 0 14px; letter-spacing:-1.4px;
}
.title-page .sub{font-size:22px; color:var(--soft); margin:0 0 40px}
.title-page .meta{font-size:14px; color:var(--faint); line-height:1.9}
.title-page .meta strong{color:var(--soft); font-weight:600}

/* ---------- structure ---------- */
h2.part{
  font-size:13px; letter-spacing:2.4px; text-transform:uppercase;
  color:var(--accent); margin:76px 0 6px; font-weight:700;
  border-top:2px solid var(--accent); padding-top:14px;
}
h3{
  font-size:27px; line-height:1.2; margin:44px 0 4px; letter-spacing:-0.4px;
}
h3 .num{color:var(--faint); font-weight:400; margin-right:10px}
h4{font-size:18.5px; margin:32px 0 6px; letter-spacing:-0.2px}
h5{font-size:14px; margin:24px 0 4px; color:var(--soft);
   text-transform:uppercase; letter-spacing:1.2px}
p{margin:0 0 14px}
.lede{font-size:19px; color:var(--soft); margin-bottom:22px}
code,.mono{
  font-family:"SF Mono",Menlo,Consolas,monospace; font-size:0.86em;
  background:var(--panel); padding:1px 5px; border-radius:3px;
  color:var(--accent);
}
.patchname{
  font-family:"SF Mono",Menlo,Consolas,monospace; font-size:0.72em;
  color:var(--faint); font-weight:400; letter-spacing:0;
  background:none; padding:0;
}
ul,ol{margin:0 0 16px; padding-left:22px}
li{margin-bottom:5px}
a{color:var(--accent)}

/* ---------- contents ---------- */
.toc{margin:0 0 40px}
.toc .part-row{
  font-size:12px; letter-spacing:2px; text-transform:uppercase;
  color:var(--accent); font-weight:700; margin:26px 0 8px;
}
.toc-line{
  display:flex; align-items:baseline; gap:8px; margin:3px 0; font-size:15.5px;
}
.toc-line .t{white-space:nowrap; overflow:hidden; text-overflow:ellipsis}
.toc-line .dots{
  flex:1; border-bottom:1px dotted var(--faint); transform:translateY(-3px);
  min-width:14px;
}
.toc-line .pg{color:var(--soft); font-variant-numeric:tabular-nums; font-size:14px}
.toc-line.sub .t{padding-left:16px; color:var(--soft)}

h3 .up{
  float:right; font-size:11px; letter-spacing:1.8px; text-transform:uppercase;
  color:var(--faint); text-decoration:none; font-weight:400; margin-top:16px;
}
h3 .up:hover{text-decoration:underline; color:var(--soft)}
@media print{ h3 .up{display:none} }
@page{ size:A4; margin:18mm 16mm 20mm 16mm }

a.toc-line{color:inherit; text-decoration:none}
a.toc-line:hover .t{text-decoration:underline}
h3[id]{scroll-margin-top:24px}

/* ---------- figure placeholders ---------- */
.fig{
  border:1px dashed var(--faint); border-radius:5px;
  background:var(--panel);
  min-height:180px; margin:22px 0 8px;
  display:flex; align-items:center; justify-content:center;
  color:var(--faint); font-size:13px; letter-spacing:0.4px;
  font-family:"SF Mono",Menlo,monospace; text-align:center; padding:20px;
}
.fig.tall{min-height:300px}
.fig.wide{min-height:130px}
.fig img{max-width:100%; display:block}
.fig.filled{border:1px solid var(--line); background:none; padding:0;
            min-height:0; overflow:hidden}
.figcap{font-size:13.5px; color:var(--soft); margin:0 0 26px; line-height:1.5}
.figcap b{color:var(--ink); font-weight:600}

/* ---------- tables ---------- */
table{
  width:100%; border-collapse:collapse; margin:16px 0 22px; font-size:14.5px;
}
th{
  text-align:left; font-weight:600; font-size:12px; text-transform:uppercase;
  letter-spacing:0.8px; color:var(--soft); border-bottom:1.5px solid var(--line);
  padding:6px 9px 6px 0;
}
td{padding:6px 9px 6px 0; border-bottom:1px solid var(--line); vertical-align:top}
td:first-child{white-space:nowrap}
table.params td:first-child{
  font-family:"SF Mono",Menlo,monospace; font-size:0.88em; color:var(--accent);
}
table.compact{font-size:13.5px}
table.specs{font-size:12.5px}
table.specs td:first-child{color:var(--ink); font-weight:600; white-space:nowrap; width:11em}
@media print{ table.specs{font-size:9.5pt} }

/* ---------- callouts ---------- */
.note,.warn,.tip{
  border-left:3px solid var(--line); padding:12px 0 12px 16px;
  margin:20px 0; font-size:15.5px; color:var(--soft);
}
.note{border-left-color:var(--faint)}
.warn{border-left-color:var(--accent); background:var(--accent-tint);
      padding-right:16px; border-radius:0 4px 4px 0}
.tip{border-left-color:var(--gold)}
.note b,.warn b,.tip b{color:var(--ink)}

/* blocco "da dove si comincia": pratico, numerato, riconoscibile a colpo d'occhio */
.start{
  border:1px solid var(--line);
  border-left:3px solid var(--ink);
  background:var(--panel);
  border-radius:0 4px 4px 0;
  padding:14px 18px 14px 18px;
  margin:24px 0;
  font-size:15.5px;
  color:var(--soft);
}
.start b{color:var(--ink)}
.start ol{margin:10px 0 0 0; padding-left:20px}
.start ol li{margin:6px 0}
.start .after{margin-top:12px; font-style:italic}


/* ---------- misc ---------- */
.kbd{
  font-family:"SF Mono",Menlo,monospace; font-size:0.8em; border:1px solid var(--line);
  border-bottom-width:2px; border-radius:4px; padding:1px 6px; background:#fff;
}
hr{border:0; border-top:1px solid var(--line); margin:40px 0}
.two-col{display:grid; grid-template-columns:1fr 1fr; gap:0 32px}
@media (max-width:640px){ .two-col{grid-template-columns:1fr} }
.chip{
  display:inline-block; font-size:11px; letter-spacing:1px; text-transform:uppercase;
  padding:2px 8px; border-radius:20px; background:var(--panel); color:var(--soft);
  margin-right:6px; font-family:"SF Mono",Menlo,monospace;
}

/* ---------- lightbox ---------- */
.fig.filled img{cursor:zoom-in}
#lightbox{
  position:fixed; inset:0; z-index:99; display:none;
  background:rgba(8,8,10,0.96); cursor:zoom-out;
  overflow:auto; padding:28px;
}
#lightbox.open{display:flex; align-items:flex-start; justify-content:center}
#lightbox img{
  max-width:none; width:auto; height:auto; margin:auto;
  box-shadow:0 8px 60px rgba(0,0,0,0.8); border-radius:4px;
}
#lightbox .hint{
  position:fixed; top:10px; right:16px; color:#9aa1ab;
  font-size:12px; font-family:"SF Mono",Menlo,monospace;
}
@media print{ #lightbox{display:none !important} }

/* ---------- print ---------- */
@media print{
  body{font-size:10.5pt}
  .wrap{max-width:none; padding:0}
  h2.part{page-break-before:always; margin-top:0}
  h3{page-break-after:avoid}
  table,.fig,.warn,.tip,.note{page-break-inside:avoid}
  .title-page{page-break-after:always; min-height:auto}
  .fig{background:none}
  a{color:var(--ink); text-decoration:none}
}