/* LODESTONE technical report - screen and print styles */

:root {
  --paper: #fbfaf7;
  --ink: #1d2126;
  --ink-2: #3b4148;
  --muted: #6a727b;
  --rule: #d9d5cc;
  --rule-strong: #1d2126;
  --accent: #8c2f1b;
  --accent-soft: #f3e7e2;
  --code-bg: #f2f0ea;

  /* figure palette, chosen for a light page and for greyscale print */
  --tx: #1f5fa8;
  --rx: #b5541a;
  --good: #2f7d4f;
  --bad: #b3261e;
  --violet: #6b4fa0;
  --metal: #8d96a0;
  --soil: #dccbb0;
  --soil-2: #c7b08f;

  --serif: "Source Serif 4", "Source Serif Pro", Georgia, "Times New Roman", serif;
  --sans: "IBM Plex Sans", "Segoe UI", Helvetica, Arial, sans-serif;
  --mono: "IBM Plex Mono", Consolas, "Courier New", monospace;
}

* { box-sizing: border-box; }
html { background: var(--paper); }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.62 var(--serif);
  font-feature-settings: "kern", "liga", "onum";
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; border-bottom: 1px solid rgba(140, 47, 27, 0.3); }
a:hover { border-bottom-color: var(--accent); }

.page { max-width: 780px; margin: 0 auto; padding-inline: 22px; }

/* ---------- running header ---------- */
.runhead {
  border-bottom: 1px solid var(--rule);
  font: 13px/1 var(--sans);
  color: var(--muted);
}
.runhead .page {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding-block: 14px;
}
.wordmark {
  font: 600 13px/1 var(--sans);
  letter-spacing: 0.22em;
  color: var(--ink);
  border: 0;
}
.docid { letter-spacing: 0.02em; }
.chapters { position: relative; }
.chapters summary {
  cursor: pointer; list-style: none; user-select: none;
  padding: 6px 10px; border: 1px solid var(--rule); border-radius: 3px;
}
.chapters summary::-webkit-details-marker { display: none; }
.chapters[open] summary { border-color: var(--ink-2); }
.chapters ol {
  position: absolute; right: 0; top: 34px; z-index: 5;
  width: 330px; margin: 0; padding: 8px 0;
  background: #fff; border: 1px solid var(--rule); box-shadow: 0 6px 18px rgba(0,0,0,0.08);
  list-style: none;
}
.chapters li a { display: flex; gap: 10px; padding: 6px 14px; border: 0; color: var(--ink-2); line-height: 1.35; }
.chapters li a:hover { background: var(--accent-soft); }
.chapters li a .n { width: 22px; flex: none; color: var(--muted); font-variant-numeric: tabular-nums; }
.chapters li.cur a { color: var(--accent); font-weight: 600; }

/* ---------- chapter title block ---------- */
.chead { padding-block: 56px 18px; border-bottom: 1px solid var(--rule); margin-bottom: 26px; }
.chead .cno { font: 500 14px/1 var(--sans); letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent); }
.chead h1 { font: 600 36px/1.15 var(--serif); margin: 12px 0 10px; letter-spacing: -0.01em; }
.chead .dek { color: var(--ink-2); font-size: 18px; margin: 0; }

/* ---------- body text ---------- */
h2 { font: 600 23px/1.3 var(--serif); margin: 40px 0 10px; }
h3 { font: 600 17px/1.35 var(--sans); margin: 28px 0 6px; color: var(--ink); }
h2 .sn, h3 .sn { color: var(--accent); font-variant-numeric: tabular-nums; margin-right: 10px; }
p { margin: 0 0 14px; hyphens: auto; }
ul, ol { margin: 0 0 14px; padding-left: 24px; }
li { margin-bottom: 5px; }
strong { font-weight: 600; }
.small { font-size: 15px; color: var(--ink-2); }
.muted { color: var(--muted); }

code, .mono { font-family: var(--mono); font-size: 0.86em; }
:not(pre) > code { background: var(--code-bg); padding: 1px 5px; border-radius: 2px; }
pre {
  font: 13px/1.55 var(--mono);
  background: var(--code-bg);
  border-left: 3px solid var(--rule);
  padding: 14px 16px; margin: 0 0 18px;
  overflow-x: auto;
}
pre .c { color: #7a7f86; }
pre .k { color: var(--accent); }
pre .s { color: var(--good); }
pre .n { color: var(--tx); }

.note {
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  padding: 12px 16px; margin: 18px 0;
  font-size: 16px;
}
.note p:last-child { margin-bottom: 0; }
.note .lbl { font: 600 12px/1 var(--sans); letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent); display: block; margin-bottom: 6px; }

/* ---------- tables (booktabs style) ---------- */
.tbl { margin: 20px 0 24px; overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font: 14px/1.45 var(--sans); }
thead th {
  text-align: left; font-weight: 600; color: var(--ink);
  border-top: 1.5px solid var(--rule-strong); border-bottom: 1px solid var(--rule-strong);
  padding: 7px 10px; vertical-align: bottom;
}
tbody td { padding: 6px 10px; border-bottom: 1px solid #ebe8e1; vertical-align: top; }
tbody tr:last-child td { border-bottom: 1.5px solid var(--rule-strong); }
tr.sub td { font-weight: 600; background: #f4f2ec; }
tr.tot td { font-weight: 700; border-top: 1px solid var(--rule-strong); }
td.r, th.r { text-align: right; font-variant-numeric: tabular-nums; white-space: nowrap; }
td.c, th.c { text-align: center; }
td.nw { white-space: nowrap; }
.tcap { font: 13.5px/1.45 var(--sans); color: var(--ink-2); margin: 0 0 8px; }
.tcap .no { font-weight: 600; color: var(--ink); margin-right: 6px; }

/* ---------- figures ---------- */
figure { margin: 26px -40px 28px; }
.fig-body { overflow-x: auto; background: #fff; border: 1px solid var(--rule); padding: 12px 10px; }
figure svg { display: block; width: 100%; height: auto; min-width: 580px; }
figcaption { font: 13.5px/1.5 var(--sans); color: var(--ink-2); margin: 10px 40px 0; }
figcaption .no { font-weight: 600; color: var(--ink); margin-right: 6px; }

/* svg vocabulary shared by all figures */
svg text { font-family: var(--sans); fill: var(--ink); }
svg .t-muted { fill: var(--muted); }
svg .t-mono { font-family: var(--mono); }
svg .t-tx { fill: var(--tx); }
svg .t-rx { fill: var(--rx); }
svg .t-good { fill: var(--good); }
svg .t-bad { fill: var(--bad); }
svg .t-violet { fill: var(--violet); }
svg .axis { stroke: #8f959c; stroke-width: 1; }
svg .grid-l { stroke: #ece9e2; stroke-width: 1; }
svg .box { fill: #f6f4ef; stroke: #b9b3a8; stroke-width: 1.1; }
svg .box-tx { fill: #eaf1f9; stroke: var(--tx); stroke-width: 1.2; }
svg .box-rx { fill: #fbeee6; stroke: var(--rx); stroke-width: 1.2; }
svg .box-proc { fill: #f1edf8; stroke: var(--violet); stroke-width: 1.2; }
svg .box-good { fill: #e9f4ed; stroke: var(--good); stroke-width: 1.2; }
svg .w-tx { stroke: var(--tx); stroke-width: 1.8; fill: none; }
svg .w-rx { stroke: var(--rx); stroke-width: 1.8; fill: none; }
svg .w-muted { stroke: var(--muted); stroke-width: 1.3; fill: none; }
svg .w-bad { stroke: var(--bad); stroke-width: 1.4; fill: none; stroke-dasharray: 5 4; }
svg .w-violet { stroke: var(--violet); stroke-width: 1.8; fill: none; }
svg .dash { stroke-dasharray: 6 5; }
svg .soil { fill: var(--soil); }
svg .soil-2 { fill: var(--soil-2); }
svg .metal { fill: var(--metal); stroke: #4d545b; stroke-width: 1; }

/* ---------- photo placeholders ---------- */
.photo .slot {
  display: grid; place-items: center; text-align: center; min-height: 170px; padding: 18px;
  border: 1px dashed #bdb7ab; background: #f5f3ee; color: var(--muted);
  font: 14px/1.5 var(--sans);
}
.photo .slot b { color: var(--ink-2); display: block; }
.photo img { display: block; width: 100%; height: auto; border: 1px solid var(--rule); }
.plates { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin: 18px 0; }
.plates figure { margin: 0; }
.plates figcaption { margin: 6px 0 0; }

/* ---------- cover ---------- */
.cover { padding-block: 70px 10px; }
.cover .series { font: 500 13px/1 var(--sans); letter-spacing: 0.16em; text-transform: uppercase; color: var(--muted); }
.cover h1 { font: 600 64px/1 var(--serif); letter-spacing: 0.08em; margin: 18px 0 14px; }
.cover .sub { font-size: 21px; line-height: 1.4; color: var(--ink-2); max-width: 640px; margin: 0 0 30px; }
.docinfo { width: auto; margin: 0 0 30px; }
.docinfo td { border: 0; padding: 3px 18px 3px 0; font: 14px/1.4 var(--sans); }
.docinfo tr:last-child td { border: 0; }
.docinfo td:first-child { color: var(--muted); }
.abstract { border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); padding: 18px 0 6px; margin: 10px 0 28px; }
.abstract h2 { font: 600 13px/1 var(--sans); letter-spacing: 0.14em; text-transform: uppercase; margin: 0 0 10px; color: var(--muted); }
.toc-list { list-style: none; padding: 0; margin: 0 0 20px; font-size: 17px; }
.toc-list li { display: flex; align-items: baseline; gap: 10px; padding: 6px 0; border-bottom: 1px dotted var(--rule); margin: 0; }
.toc-list .n { width: 26px; color: var(--accent); font-variant-numeric: tabular-nums; }
.toc-list a { border: 0; color: var(--ink); }
.toc-list a:hover { color: var(--accent); }
.toc-list .pg { margin-left: auto; font: 13px var(--sans); color: var(--muted); }

/* ---------- pagination ---------- */
.pager {
  margin: 50px 0 0; padding: 18px 0 34px; border-top: 1px solid var(--rule);
  font: 14px/1 var(--sans);
}
.pager .row { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.pager .pn { display: flex; gap: 4px; flex-wrap: wrap; }
.pager .pn a, .pager .pn span {
  display: inline-grid; place-items: center; min-width: 32px; height: 32px; padding: 0 6px;
  border: 1px solid var(--rule); border-radius: 2px; color: var(--ink-2);
  font-variant-numeric: tabular-nums;
}
.pager .pn a:hover { border-color: var(--ink-2); }
.pager .pn .cur { background: var(--ink); border-color: var(--ink); color: #fff; }
.pager .step { color: var(--ink); border: 0; white-space: nowrap; }
.pager .step:hover { color: var(--accent); }
.pager .step.off { color: #c2bdb3; pointer-events: none; }
.pager .where { margin-top: 12px; color: var(--muted); font-size: 13px; }
.pager .where a { border: 0; }

footer.colophon { font: 12.5px/1.5 var(--sans); color: var(--muted); padding-bottom: 30px; }

.katex { font-size: 1.02em; }
.katex-display { overflow-x: auto; overflow-y: hidden; padding: 2px 0; }

@media (max-width: 860px) {
  figure { margin-inline: 0; }
  figcaption { margin-inline: 0; }
}
@media (max-width: 600px) {
  body { font-size: 16px; }
  .chead h1 { font-size: 28px; }
  .cover h1 { font-size: 44px; }
  .docid { display: none; }
  .pager .pn { display: none; }
  .pager .row { justify-content: space-between; }
}

/* ---------- print ---------- */
@page { size: A4; margin: 18mm 17mm 20mm; }
@media print {
  body { font-size: 10.5pt; background: #fff; }
  html { background: #fff; }
  .runhead, .pager, .chapters { display: none !important; }
  .page { max-width: none; padding: 0; }
  .chapter { break-before: page; }
  .chapter:first-child { break-before: auto; }
  .chead { padding-top: 0; }
  figure { margin-inline: 0; break-inside: avoid; }
  figcaption { margin-inline: 0; }
  .fig-body { border-color: #ccc; }
  .tbl, pre, .note { break-inside: avoid; }
  h2, h3 { break-after: avoid; }
  a { border: 0; color: var(--ink); }
  .cover { padding-top: 40mm; }
}

/* ---------- key figures on the cover ---------- */
.keyfigs {
  display: grid; grid-template-columns: repeat(3, 1fr);
  border-top: 1.5px solid var(--rule-strong); border-bottom: 1px solid var(--rule);
  margin: 4px 0 30px;
}
.keyfigs div { padding: 14px 16px 14px 0; border-bottom: 1px solid #ebe8e1; }
.keyfigs div:nth-child(3n+2), .keyfigs div:nth-child(3n+3) { padding-left: 16px; border-left: 1px solid #ebe8e1; }
.keyfigs div:nth-last-child(-n+3) { border-bottom: 0; }
.keyfigs b { display: block; font: 600 25px/1.15 var(--serif); color: var(--ink); font-variant-numeric: lining-nums tabular-nums; }
.keyfigs span { display: block; margin-top: 4px; font: 13px/1.4 var(--sans); color: var(--muted); }
@media (max-width: 600px) {
  .keyfigs { grid-template-columns: 1fr 1fr; }
  .keyfigs div, .keyfigs div:nth-child(3n+2), .keyfigs div:nth-child(3n+3) { padding: 12px 10px 12px 0; border-left: 0; border-bottom: 1px solid #ebe8e1; }
}
@media print { .keyfigs { break-inside: avoid; } }

/* ---------- cover: status line and numbered steps ---------- */
.cover .sub { margin-bottom: 12px; }
.cover .status { font: 14px/1.5 var(--sans); color: var(--muted); margin: 0 0 8px; }
ol.steps { list-style: none; counter-reset: step; padding: 0; margin: 8px 0 30px; }
ol.steps li { counter-increment: step; position: relative; padding: 0 0 0 46px; margin: 0 0 14px; }
ol.steps li::before {
  content: counter(step);
  position: absolute; left: 0; top: 1px;
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--accent); color: #fff;
  font: 700 14px/28px var(--sans); text-align: center;
}
@media print { ol.steps li { break-inside: avoid; } }

/* ---------- language switch and Armenian typography ---------- */
.runhead .lang {
  font: 13px/1 var(--sans); color: var(--ink-2);
  padding: 6px 10px; border: 1px solid var(--rule); border-radius: 3px;
  margin-left: auto; margin-right: 10px;
}
.runhead .lang:hover { border-color: var(--ink-2); }
html:lang(hy) {
  --serif: "Noto Serif Armenian", "Source Serif 4", Georgia, serif;
  --sans: "Noto Sans Armenian", "IBM Plex Sans", "Segoe UI", sans-serif;
}
html:lang(hy) body { font-size: 16.5px; line-height: 1.7; }
html:lang(hy) .cover h1 { font-family: "Source Serif 4", Georgia, serif; }