:root {
  --accent: #1a5faa;
  --accent-dark: #0f3f73;
  --ink: #1c1f23;
  --muted: #555b63;
  --rule: #d4dae1;
  --panel-bg: #f6f9fc;
}
@page { size: A4; margin: 16mm 17mm 19mm 17mm; }
* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  color: var(--ink); background: #fff;
  -webkit-print-color-adjust: exact; print-color-adjust: exact;
}
body { font-family: "Helvetica Neue", Arial, sans-serif; font-size: 9.4pt; line-height: 1.42; }

/* ── Letterhead ─────────────────────────────────────────────────────── */
.letterhead {
  border-bottom: 2.2pt solid var(--accent);
  padding-bottom: 6px; margin-bottom: 10px;
  display: flex; justify-content: space-between; align-items: flex-end;
}
.lh-org { font-size: 13pt; font-weight: 700; letter-spacing: .2px; color: var(--accent-dark); }
.lh-dept { font-size: 9pt; color: var(--muted); }
.sender-block { text-align: right; font-size: 8.5pt; color: var(--muted); line-height: 1.3; }
.sender-block p { margin: 0; }
.sender-block .sender-name { font-size: 9.2pt; font-weight: 700; color: var(--ink); }

/* ── Title block ────────────────────────────────────────────────────── */
.doc-title { font-size: 19pt; font-weight: 700; color: var(--accent-dark); margin: 0 0 2px 0; line-height: 1.15; }
.doc-subtitle { font-size: 10.5pt; color: var(--muted); margin: 0 0 12px 0; }

/* ── Meta panel (facility / category / resource) ───────────────────── */
.meta-panel {
  background: var(--panel-bg); border: 0.8pt solid var(--rule); border-left: 3pt solid var(--accent);
  border-radius: 3px; padding: 8px 12px; margin: 0 0 16px 0;
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 4px 24px;
}
.meta-panel .field-label {
  font-size: 7.4pt; font-weight: 700; text-transform: uppercase; letter-spacing: .5px;
  color: var(--accent-dark); margin: 0 0 1px 0;
}
.meta-panel .field-value { font-size: 9.2pt; color: var(--ink); margin: 0; }

/* ── Part banners ───────────────────────────────────────────────────── */
.part-banner {
  background: var(--accent-dark); color: #fff;
  font-size: 10.5pt; font-weight: 700; letter-spacing: .4px;
  padding: 5px 10px; margin: 22px 0 12px 0; border-radius: 2px;
  break-before: page;
}
.part-banner.part-banner-first { break-before: auto; margin-top: 4px; }
.part-note { font-size: 8pt; color: var(--muted); font-style: italic; margin: -8px 0 12px 0; }

/* ── Section headings ───────────────────────────────────────────────── */
h2 {
  font-size: 10.8pt; font-weight: 700; color: var(--accent-dark);
  margin: 14px 0 6px 0; padding-bottom: 2px; border-bottom: 0.8pt solid var(--rule);
}
h3 { font-size: 9.6pt; font-weight: 700; font-style: italic; color: var(--ink); margin: 9px 0 4px 0; }

p { margin: 0 0 7px 0; text-align: justify; }
ul, ol { margin: 0 0 7px 0; padding-left: 15px; }
li { margin-bottom: 2px; text-align: justify; }

table { border-collapse: collapse; width: 100%; margin: 6px 0 10px 0; font-size: 8.4pt; }
th, td { border: 0.6pt solid var(--rule); padding: 3px 5px; text-align: left; vertical-align: top; }
th { background: var(--panel-bg); color: var(--accent-dark); font-weight: 700; }
tr:nth-child(even) td { background: #fbfcfe; }

strong, b { color: var(--accent-dark); font-weight: 700; }
em, i { font-style: italic; }
.mono { font-family: "Courier New", Courier, monospace; font-size: 8.6pt; background: #f2f5f8; padding: 0 2px; border-radius: 2px; }
.small { font-size: 8.4pt; color: var(--muted); }
.footnote { font-size: 7.8pt; color: var(--muted); }

/* ── References ─────────────────────────────────────────────────────── */
.ref-list {
  font-size: 8.4pt; line-height: 1.4; text-align: left;
  text-indent: -14px; padding-left: 14px; margin: 0 0 5px 0;
}

.watermark {
  text-align: center; font-size: 7.6pt; color: #9aa4ad; letter-spacing: .6px;
  text-transform: uppercase; margin: 2px 0 18px 0;
}

/* ── Schematic diagrams (inline SVG) ───────────────────────────────── */
.figure { margin: 4px 0 12px 0; }
.figcap { font-size: 8pt; font-style: italic; color: var(--muted); margin: 3px 0 0 0; }
.sch-box { fill: var(--panel-bg); stroke: var(--accent); stroke-width: 1.2; }
.sch-box-strong { fill: #eaf1fa; stroke: var(--accent-dark); stroke-width: 1.6; }
.sch-label { font-family: "Helvetica Neue", Arial, sans-serif; font-size: 9.5px; font-weight: 600; fill: var(--accent-dark); }
.sch-sublabel { font-family: "Helvetica Neue", Arial, sans-serif; font-size: 8px; fill: var(--muted); }
.sch-arrow { stroke: var(--accent); stroke-width: 1.4; }
.sch-arrowhead { fill: var(--accent); }