/* www.cadpilot.org – site stylesheet
   Idea: the page is a drawing sheet. One accent colour, the red of revision
   clouds; everything else is ink and construction lines. */

:root,
:root[data-theme="dark"] {
  --board: #1c2327;          /* graphite drawing board */
  --board-raised: #232b30;
  --ink: #dde3e0;
  --ink-soft: #a9b3b0;
  --ink-faint: #7b8784;
  --construction: #3d4a50;   /* thin construction lines */
  --construction-strong: #5b6a70;
  --revision: #f06d5e;       /* revision-cloud red, the only accent */
  --revision-ink: #1c2327;
  --ok: #82c794;
  --pending: #e0b95e;
  --code: #2a3338;
  color-scheme: dark;
}

:root[data-theme="light"] {
  --board: #edf0ec;          /* cool drafting vellum */
  --board-raised: #f7f8f5;
  --ink: #1b2226;
  --ink-soft: #414c51;
  --ink-faint: #66727a;
  --construction: #c3cbc8;
  --construction-strong: #8e9a9e;
  --revision: #b8322a;
  --revision-ink: #ffffff;
  --ok: #2f7a45;
  --pending: #8a6412;
  --code: #e2e7e3;
  color-scheme: light;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--board);
  color: var(--ink);
  font: 400 1.0625rem/1.65 "Source Serif 4", Georgia, serif;
  font-optical-sizing: auto;
}

h1, h2, h3, .ui, nav, .titleblock, table, .revision-index, .button, footer {
  font-family: "Barlow Semi Condensed", "Arial Narrow", Arial, sans-serif;
}

h1, h2, h3 { font-weight: 600; line-height: 1.12; margin: 0; color: var(--ink); }
h1 { font-size: clamp(2.3rem, 4.8vw, 3.6rem); letter-spacing: -0.01em; font-weight: 700; }
h2 { font-size: clamp(1.6rem, 2.6vw, 2.1rem); margin-bottom: 0.9rem; }
h3 { font-size: 1.25rem; margin-bottom: 0.4rem; }
p { margin: 0 0 1rem; max-width: 68ch; }
a { color: inherit; text-decoration-color: var(--revision); text-underline-offset: 0.18em; text-decoration-thickness: 1.5px; }
a:hover { color: var(--revision); }
:focus-visible { outline: 2px solid var(--revision); outline-offset: 3px; border-radius: 2px; }
code { font-family: ui-monospace, Consolas, monospace; font-size: 0.88em; background: var(--code); padding: 0.08em 0.35em; border-radius: 3px; }
strong { font-weight: 600; }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 16px; top: 12px; background: var(--board-raised); padding: 6px 10px; z-index: 10; }

/* ── header ─────────────────────────────────────────────── */
header.site {
  border-bottom: 1px solid var(--construction);
}
header.site .wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; min-height: 64px; flex-wrap: wrap;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-family: "Barlow Semi Condensed", sans-serif; font-weight: 700; font-size: 1.15rem;
  text-decoration: none; color: var(--ink);
}
.brand img { width: auto; height: 32px; }
.brand small { font-weight: 500; color: var(--ink-faint); font-size: 0.95rem; }
@media (max-width: 1100px) { .brand small { display: none; } }
nav.main { display: flex; align-items: center; gap: 4px; flex-wrap: wrap; font-size: 1.02rem; font-weight: 500; }
nav.main a { text-decoration: none; padding: 6px 10px; border-radius: 4px; color: var(--ink-soft); }
nav.main a:hover { color: var(--ink); background: var(--board-raised); }
nav.main a[aria-current="page"] { color: var(--ink); box-shadow: inset 0 -2px 0 var(--revision); border-radius: 0; }
.switches { display: flex; align-items: center; gap: 8px; margin-left: 8px; }
.lang { display: inline-flex; border: 1px solid var(--construction-strong); border-radius: 4px; overflow: hidden; font-size: 0.92rem; }
.lang a, .lang span { display: inline-flex; align-items: center; gap: 6px; padding: 3px 9px; text-decoration: none; color: var(--ink-soft); }
.lang .flag { width: 18px; height: 12px; flex: none; border-radius: 1px; box-shadow: 0 0 0 1px var(--construction); }
.lang span[aria-current] { background: var(--ink); color: var(--board); }
.theme {
  font: inherit; font-size: 0.92rem; cursor: pointer; background: none; color: var(--ink-soft);
  border: 1px solid var(--construction-strong); border-radius: 4px; padding: 3px 9px;
}
.theme:hover { color: var(--ink); }
.theme .when-dark, :root[data-theme="light"] .theme .when-light { display: inline; }
.theme .when-light, :root[data-theme="light"] .theme .when-dark { display: none; }

/* ── hero ───────────────────────────────────────────────── */
.hero { padding: 56px 0 24px; }
.hero .wrap { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: 40px; align-items: center; }
/* supplied logo: dark lettering, so it sits on a light plate in the dark theme */
.logo-plate { display: inline-block; margin: 0 0 26px; }
.logo-plate img { display: block; width: min(420px, 100%); height: auto; }
:root:not([data-theme="light"]) .logo-plate { background: #edf0ec; padding: 12px 18px; border-radius: 3px; }
.hero p.lead { font-size: 1.2rem; color: var(--ink-soft); margin-top: 1.1rem; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 1.6rem; }
.button {
  display: inline-block; font-size: 1.05rem; font-weight: 600; text-decoration: none;
  padding: 9px 18px; border-radius: 4px; border: 1.5px solid var(--ink);
}
.button.primary { background: var(--ink); color: var(--board); }
.button.primary:hover { background: var(--revision); border-color: var(--revision); color: var(--revision-ink); }
.button.secondary:hover { border-color: var(--revision); }

/* the drawing: construction-line colour, one-time draw on load */
.drawing { width: 100%; height: auto; color: var(--ink); }
.drawing .part { fill: none; stroke: currentColor; stroke-width: 2; stroke-linejoin: round; }
.drawing .hidden-edge { fill: none; stroke: var(--ink-faint); stroke-width: 1.2; stroke-dasharray: 5 4; }
.drawing .dim { fill: none; stroke: var(--revision); stroke-width: 1.1; }
.drawing .dim-text { fill: var(--revision); font: 600 15px "Barlow Semi Condensed", sans-serif; }
.drawing .centre { stroke: var(--ink-faint); stroke-width: 1; stroke-dasharray: 14 3 2 3; fill: none; }
@media (prefers-reduced-motion: no-preference) {
  .drawing .part { stroke-dasharray: 1400; stroke-dashoffset: 1400; animation: draw 1.6s ease-out 0.2s forwards; }
  .drawing .dim, .drawing .dim-text { opacity: 0; animation: appear 0.5s ease-out 1.7s forwards; }
}
@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes appear { to { opacity: 1; } }

/* ── title block (Schriftfeld) ──────────────────────────── */
.titleblock {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
  border: 2px solid var(--ink); margin: 24px 0 8px;
}
.titleblock > div {
  border-right: 1px solid var(--ink); border-bottom: 1px solid var(--ink);
  padding: 6px 10px 8px; min-height: 64px;
}
.titleblock > div:nth-child(4n) { border-right: 0; }
.titleblock > div:nth-last-child(-n+4) { border-bottom: 0; }
.titleblock .k { display: block; font-size: 0.82rem; color: var(--ink-faint); font-weight: 500; }
.titleblock .v { display: block; font-size: 1.35rem; font-weight: 600; font-variant-numeric: tabular-nums; }
.titleblock .wide { grid-column: span 2; }
.titleblock .status .v { color: var(--pending); font-size: 1.1rem; }
.titleblock-note { font-size: 0.92rem; color: var(--ink-faint); }

/* ── sections ───────────────────────────────────────────── */
section.block { padding: 56px 0 8px; }
section.block + section.block { border-top: 1px solid var(--construction); margin-top: 40px; }
.two-col { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 40px; }
.intro { color: var(--ink-soft); max-width: 68ch; }

table { border-collapse: collapse; width: 100%; font-size: 1.02rem; margin: 12px 0 8px; }
th, td { text-align: left; vertical-align: top; padding: 9px 12px 9px 0; border-bottom: 1px solid var(--construction); }
th { font-weight: 600; color: var(--ink-faint); font-size: 0.92rem; border-bottom: 1.5px solid var(--ink); }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; padding-right: 16px; }
td .sub { display: block; color: var(--ink-faint); font-size: 0.93rem; }
.table-wrap { overflow-x: auto; }

ol.flow { list-style: none; padding: 0; margin: 12px 0 0; counter-reset: step; }
ol.flow li { counter-increment: step; position: relative; padding: 0 0 18px 52px; max-width: 68ch; }
ol.flow li::before {
  content: counter(step); position: absolute; left: 0; top: -2px;
  width: 34px; height: 34px; border: 1.5px solid var(--ink); border-radius: 50%;
  display: grid; place-items: center; font: 600 1.05rem "Barlow Semi Condensed", sans-serif;
}
ol.flow li:not(:last-child)::after {
  content: ""; position: absolute; left: 17px; top: 34px; bottom: 2px; border-left: 1px dashed var(--construction-strong);
}
ol.flow strong { font-family: "Barlow Semi Condensed", sans-serif; font-size: 1.12rem; }

.safeguards { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px 40px; }
.safeguards div { border-left: 2px solid var(--construction-strong); padding: 2px 0 2px 16px; }
.safeguards h3 { font-size: 1.15rem; }
.safeguards p { font-size: 1rem; color: var(--ink-soft); margin: 0; }

.status-list { list-style: none; padding: 0; margin: 8px 0 0; }
.status-list li { padding: 6px 0 6px 28px; position: relative; max-width: 68ch; }
.status-list li::before { position: absolute; left: 0; top: 6px; font-family: "Barlow Semi Condensed", sans-serif; font-weight: 700; }
.status-list li.done::before { content: "✓"; color: var(--ok); }
.status-list li.open::before { content: "○"; color: var(--pending); }

/* ── revision table (news) ──────────────────────────────── */
.revisions { border-top: 2px solid var(--ink); margin-top: 16px; }
.revision { display: grid; grid-template-columns: 64px 118px minmax(0, 1fr); gap: 0 16px; border-bottom: 1px solid var(--construction); padding: 16px 0; }
.revision-index {
  font-size: 1.5rem; font-weight: 700; width: 44px; height: 44px; display: grid; place-items: center;
  border: 2px solid var(--revision); color: var(--revision); border-radius: 50% 46% 52% 48%;
}
.revision time { font-family: "Barlow Semi Condensed", sans-serif; color: var(--ink-faint); padding-top: 9px; font-variant-numeric: tabular-nums; }
.revision h3 { padding-top: 6px; }
.revision details { margin-top: 6px; }
.revision summary { cursor: pointer; font-family: "Barlow Semi Condensed", sans-serif; font-weight: 600; color: var(--ink-soft); width: fit-content; }
.revision summary:hover { color: var(--ink); }
.revision ul { margin: 8px 0 4px; padding-left: 1.2rem; max-width: 70ch; }
.revision li { margin: 4px 0; }
.revision .lead { margin: 4px 0 0; color: var(--ink-soft); }
.revision .lead, .revision details { grid-column: 3; }

/* ── docs list ──────────────────────────────────────────── */
.doclist { list-style: none; padding: 0; margin: 16px 0 0; border-top: 1.5px solid var(--ink); }
.doclist li { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 8px 24px; padding: 18px 0; border-bottom: 1px solid var(--construction); align-items: baseline; }
.doclist h3 a { text-decoration: none; }
.doclist h3 a:hover { text-decoration: underline; text-decoration-color: var(--revision); }
.doclist p { margin: 4px 0 0; color: var(--ink-soft); }
.doclist .meta { font-family: "Barlow Semi Condensed", sans-serif; color: var(--ink-faint); white-space: nowrap; }

.note { border-left: 3px solid var(--pending); padding: 6px 0 6px 16px; color: var(--ink-soft); max-width: 70ch; }

/* ── footer ─────────────────────────────────────────────── */
footer { border-top: 2px solid var(--ink); margin-top: 72px; padding: 22px 0 40px; font-size: 0.98rem; color: var(--ink-soft); }
footer .wrap { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); gap: 24px; }
footer a { color: var(--ink-soft); }
footer nav { display: flex; flex-wrap: wrap; gap: 6px 18px; justify-content: flex-end; align-content: start; }
footer p { margin: 0; font-family: "Source Serif 4", serif; font-size: 0.95rem; }

/* ── responsive & print ─────────────────────────────────── */
@media (max-width: 880px) {
  .hero .wrap, .two-col, footer .wrap { grid-template-columns: minmax(0, 1fr); }
  .hero { padding-top: 32px; }
  .titleblock { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .titleblock > div:nth-child(4n) { border-right: 1px solid var(--ink); }
  .titleblock > div:nth-child(2n) { border-right: 0; }
  .titleblock > div:nth-last-child(-n+4) { border-bottom: 1px solid var(--ink); }
  .titleblock > div:nth-last-child(-n+2) { border-bottom: 0; }
  .safeguards { grid-template-columns: minmax(0, 1fr); }
  footer nav { justify-content: flex-start; }
}
@media (max-width: 560px) {
  .wrap { padding: 0 16px; }
  .revision { grid-template-columns: 52px minmax(0, 1fr); }
  .revision time { grid-column: 2; padding-top: 0; }
  .revision h3, .revision .lead, .revision details { grid-column: 2; }
  .revision-index { grid-row: span 2; }
  .doclist li { grid-template-columns: minmax(0, 1fr); }
  nav.main { width: 100%; }
}
@media print {
  header.site nav.main, .switches, .actions { display: none; }
  body { background: #fff; color: #000; }
}