/* Shared structure for small project sites. A page's own stylesheet sets the palette, fonts and
   motif through these custom properties; nothing here chooses an identity. Drawings (svg.dg) carry
   no colours: every stroke and fill is a class resolved below from --k-* roles. */

:root {
  --page-bg: #f7f5ef; --page-text: #22242a; --page-muted: #5d6170; --page-line: #dcd8cc;
  --page-accent: #3d5a99; --strong: #121318; --surface: #fffdf8; --raise: #efece3;
  --code-bg: #efece3; --code-text: #23262f;
  --page-ui: system-ui, sans-serif; --display: var(--page-ui); --mono: ui-monospace, monospace;
  --k-ink: var(--page-text); --k-accent: var(--page-accent); --k-a: #a35d1d; --k-b: #2f6f8f; --k-c: #6a4fa0;
  --k-d: #a8457a; --k-ok: #2f7d4a; --k-warn: #9a6b0c; --k-err: #b4321f; --k-muted: #8d8f99; --k-file: #6b6e78;
  --measure: 68ch; --wide: 1080px;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 16px; }
body { margin: 0; background: var(--page-bg); color: var(--page-text); font: 400 17px/1.62 var(--page-ui);
  text-rendering: optimizeLegibility; -webkit-font-smoothing: antialiased; }
img, svg { max-width: 100%; height: auto; }
a { color: var(--page-accent); text-underline-offset: 0.18em; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--page-accent); outline-offset: 2px; border-radius: 2px; }
::selection { background: color-mix(in srgb, var(--page-accent) 24%, transparent); }

.skip { position: absolute; left: 12px; top: -60px; z-index: 10; padding: 8px 14px; background: var(--strong);
  color: var(--page-bg); border-radius: 6px; text-decoration: none; }
.skip:focus { top: 12px; }

.wrap { width: min(var(--wide), 100% - 40px); margin-inline: auto; }
.topbar { display: flex; align-items: baseline; gap: 18px; flex-wrap: wrap; padding: 18px 0 0; font: 500 14px/1.4 var(--mono);
  color: var(--page-muted); }
.topbar a { color: inherit; text-decoration: none; }
.topbar a:hover { color: var(--page-accent); }
.topbar .src { margin-left: auto; }

h1, h2, h3 { font-family: var(--display); color: var(--strong); line-height: 1.15; margin: 0; text-wrap: balance; }
h1 { font-size: clamp(34px, 5vw, 56px); font-weight: 700; letter-spacing: -0.02em; }
h2 { font-size: clamp(26px, 3vw, 34px); font-weight: 650; letter-spacing: -0.01em; margin-bottom: 14px; }
h3 { font-size: 19px; font-weight: 650; margin: 26px 0 8px; }
p, ul, ol { margin: 0 0 14px; }
p, li { max-width: var(--measure); }
.lede { font-size: clamp(18px, 1.6vw, 21px); line-height: 1.55; color: var(--page-text); max-width: 62ch; }
.muted { color: var(--page-muted); }
.note { font-size: 14.5px; color: var(--page-muted); }

header.intro { padding: clamp(32px, 6vh, 64px) 0 12px; }
header.intro h1 + p { margin-top: 14px; }
section.part { padding: clamp(28px, 5vh, 52px) 0 8px; border-top: 1px solid var(--page-line); margin-top: clamp(24px, 4vh, 40px); }
.cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr)); gap: 12px 40px; align-items: start; }
.cols > * { min-width: 0; }

code, kbd, samp { font-family: var(--mono); font-size: 0.88em; }
:not(pre) > code { background: var(--code-bg); color: var(--code-text); padding: 0.08em 0.36em; border-radius: 4px; }
pre { margin: 0 0 16px; padding: 14px 16px; overflow-x: auto; background: var(--code-bg); color: var(--code-text);
  border-radius: 8px; font: 14px/1.55 var(--mono); tab-size: 2; }
pre code { font-size: inherit; }
pre .c { color: var(--page-muted); font-style: italic; }
pre .p::before { content: "$ "; color: var(--page-muted); user-select: none; }
pre .o { color: var(--page-muted); }
pre .e { color: var(--k-err); }
pre .k { color: var(--page-accent); font-weight: 600; }

.table-wrap { overflow-x: auto; margin: 0 0 18px; }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
caption { text-align: left; font: 600 13px/1.4 var(--mono); letter-spacing: 0.04em; color: var(--page-muted); padding: 0 0 8px; }
th, td { text-align: left; vertical-align: top; padding: 7px 12px 7px 0; border-bottom: 1px solid var(--page-line); }
thead th { font: 600 12.5px/1.3 var(--mono); letter-spacing: 0.04em; color: var(--page-muted); text-transform: uppercase; }
td code, th code { white-space: nowrap; }

figure { margin: 20px 0 22px; }
.fig { overflow-x: auto; }
.fig svg.dg { display: block; min-width: 640px; width: 100%; height: auto; }
figcaption { margin-top: 10px; font-size: 14.5px; color: var(--page-muted); max-width: var(--measure); }
figcaption b { color: var(--page-text); font-weight: 600; }

footer.foot { margin-top: clamp(40px, 8vh, 80px); padding: 22px 0 40px; border-top: 1px solid var(--page-line);
  font-size: 14px; color: var(--page-muted); display: flex; gap: 20px; flex-wrap: wrap; }
footer.foot a { color: inherit; }

/* sideways scrolling: site.js sets data-more on regions wider than their box */
[data-more="right"] { -webkit-mask-image: linear-gradient(90deg, #000 calc(100% - 40px), transparent); mask-image: linear-gradient(90deg, #000 calc(100% - 40px), transparent); }
[data-more="left"] { -webkit-mask-image: linear-gradient(90deg, transparent, #000 40px); mask-image: linear-gradient(90deg, transparent, #000 40px); }
[data-more="both"] { -webkit-mask-image: linear-gradient(90deg, transparent, #000 40px, #000 calc(100% - 40px), transparent); mask-image: linear-gradient(90deg, transparent, #000 40px, #000 calc(100% - 40px), transparent); }

/* drawings */
.dg { --k: var(--k-ink); overflow: visible; }
.dg text { font-family: var(--page-ui); fill: var(--page-text); }
.dg .m { font-family: var(--mono); }
.dg .k-ink { --k: var(--k-ink); } .dg .k-accent { --k: var(--k-accent); }
.dg .k-a { --k: var(--k-a); } .dg .k-b { --k: var(--k-b); } .dg .k-c { --k: var(--k-c); } .dg .k-d { --k: var(--k-d); }
.dg .k-ok { --k: var(--k-ok); } .dg .k-warn { --k: var(--k-warn); } .dg .k-err { --k: var(--k-err); }
.dg .k-muted { --k: var(--k-muted); } .dg .k-file { --k: var(--k-file); }
.dg .node { fill: var(--surface); stroke: var(--k); stroke-width: 1.5; }
.dg .node.solid { fill: var(--k); }
.dg .node.ghost { fill: none; stroke-dasharray: 4 3; }
.dg .shadow { fill: color-mix(in srgb, var(--k) 20%, transparent); stroke: none; }
.dg .lbl { fill: var(--strong); font-weight: 650; }
.dg .sub { fill: var(--page-muted); }
.dg .cap { fill: var(--k); font-family: var(--mono); letter-spacing: 0.08em; }
.dg .edge { fill: none; stroke: var(--k); }
.dg .edge.dash { stroke-dasharray: 6 4; }
.dg .edge.dot { stroke-dasharray: 1.5 4; stroke-linecap: round; }
.dg .tip { fill: var(--k); stroke: none; }
.dg .tip.open { fill: none; stroke: var(--k); stroke-width: 1.5; }
.dg .lab-bg { fill: var(--page-bg); }
.dg .elabel { fill: color-mix(in srgb, var(--k) 70%, var(--page-text)); }
.dg .halo { paint-order: stroke; stroke: var(--page-bg); stroke-width: 4px; stroke-linejoin: round; }
.dg .grp { fill: none; stroke: var(--k); stroke-width: 1; }
.dg .grp.dash { stroke-dasharray: 5 4; }
.dg .frame-tag { fill: var(--page-bg); stroke: var(--k); }
.dg .frame-tag-t { fill: var(--k); font-family: var(--mono); letter-spacing: 0.1em; }
.dg .note { fill: var(--surface); stroke: var(--page-line); }
.dg .note-t { fill: var(--page-muted); }
.dg .life { stroke: var(--page-line); stroke-dasharray: 2 4; }
.dg .frame { fill: none; stroke: var(--k); }
.dg .badge { fill: var(--k); }
.dg .badge-t { fill: var(--page-bg); font-family: var(--mono); font-weight: 600; }
.dg .band { fill: var(--k); }
.dg .cut { fill: none; stroke: var(--k); stroke-width: 1.5; }
.dg .axis { fill: var(--page-muted); }

@media (max-width: 640px) {
  body { font-size: 16px; }
  .topbar .src { margin-left: 0; }
  pre { font-size: 13px; padding: 12px; }
}
@media print {
  body { background: #fff; color: #000; }
  .skip, .topbar { display: none; }
  pre { white-space: pre-wrap; }
  section.part { break-inside: avoid-page; }
}