/* ============================================================
   PROJECT LOG — engineering notebook theme
   No frameworks, no webfonts, no external requests.
   ============================================================ */

:root {
  --paper: #f7f5ee;            /* cream notebook paper */
  --grid-minor: rgba(58, 110, 165, 0.055);
  --grid-major: rgba(58, 110, 165, 0.11);
  --ink: #26303a;              /* body text */
  --ink-faint: #5d6b78;        /* secondary text */
  --draft-blue: #2b5d8c;       /* links, rules */
  --red-pencil: #c0392b;       /* annotations, highlights */
  --panel: rgba(255, 255, 255, 0.72);  /* slightly opaque blocks over the grid */
  --line: rgba(38, 48, 58, 0.35);      /* title block / table borders */
  --code-bg: #eceae0;
  --mono: ui-monospace, "Cascadia Code", "JetBrains Mono", "Fira Code",
          Menlo, Consolas, monospace;
  --serif: Charter, "Bitstream Charter", "Iowan Old Style", Georgia,
           "Times New Roman", serif;
  --cell: 8px;                 /* grid cell size */
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #14181d;
    --grid-minor: rgba(94, 156, 211, 0.05);
    --grid-major: rgba(94, 156, 211, 0.10);
    --ink: #d4d9de;
    --ink-faint: #8b97a3;
    --draft-blue: #6da8d8;
    --red-pencil: #e07b6d;
    --panel: rgba(20, 24, 29, 0.72);
    --line: rgba(170, 180, 190, 0.30);
    --code-bg: #1d232a;
  }
}

* { box-sizing: border-box; }

html { height: 100%; }

body {
  margin: 0;
  min-height: 100%;
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.0625rem;
  line-height: 1.65;
  background-color: var(--paper);
  /* 5mm-style graph paper: minor grid + heavier line every 5th cell */
  background-image:
    repeating-linear-gradient(to right,
      var(--grid-major) 0, var(--grid-major) 1px,
      transparent 1px, transparent calc(var(--cell) * 5)),
    repeating-linear-gradient(to bottom,
      var(--grid-major) 0, var(--grid-major) 1px,
      transparent 1px, transparent calc(var(--cell) * 5)),
    repeating-linear-gradient(to right,
      var(--grid-minor) 0, var(--grid-minor) 1px,
      transparent 1px, transparent var(--cell)),
    repeating-linear-gradient(to bottom,
      var(--grid-minor) 0, var(--grid-minor) 1px,
      transparent 1px, transparent var(--cell));
}

.sheet {
  max-width: 72ch;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}

/* index pages are wider to fit the sidebar */
.sheet.wide { max-width: 100ch; }

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 16rem;
  gap: 2.5rem;
  align-items: start;
}

@media (max-width: 800px) {
  .layout { grid-template-columns: minmax(0, 1fr); }
}

/* ---- title block (technical-drawing style header) ---------- */

.titleblock {
  border: 1px solid var(--line);
  background: var(--panel);
  font-family: var(--mono);
  margin-bottom: 2.5rem;
}

.titleblock-name {
  display: block;
  padding: 0.9rem 1rem 0.7rem;
  border-bottom: 1px solid var(--line);
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
}

.titleblock-name:hover { color: var(--draft-blue); }

.titleblock-meta {
  display: flex;
  flex-wrap: wrap;
}

.titleblock-meta > div {
  flex: 1 1 auto;
  padding: 0.35rem 1rem 0.5rem;
  border-right: 1px solid var(--line);
  min-width: 8rem;
}

.titleblock-meta > div:last-child { border-right: none; }

.titleblock-meta .label {
  display: block;
  font-size: 0.6rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.titleblock-meta .value {
  font-size: 0.85rem;
  color: var(--ink);
}

/* REV cell becomes clickable once build.sh has stamped commit details */
.rev-clickable {
  cursor: pointer;
  text-decoration: underline dotted;
  text-underline-offset: 3px;
}

.rev-clickable:hover { color: var(--draft-blue); }

.rev-anchor { position: relative; }

.rev-popover {
  display: none;
  position: absolute;
  top: calc(100% + 0.45rem);
  right: 0;
  z-index: 10;
  min-width: 17rem;
  max-width: min(24rem, calc(100vw - 2rem));
  font-family: var(--mono);
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--line);
  box-shadow: 0 4px 14px rgba(10, 14, 18, 0.18);
}

.rev-popover.open { display: block; }

.rev-popover dl { margin: 0; padding: 0.75rem 0.9rem 0.1rem; }

.rev-popover dt {
  font-size: 0.62rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-faint);
}

.rev-popover dd {
  margin: 0.1rem 0 0.6rem;
  font-size: 0.82rem;
  overflow-wrap: anywhere;
}

.rev-popover > a {
  display: block;
  padding: 0 0.9rem 0.75rem;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  text-decoration: none;
}

/* ---- headings & prose --------------------------------------- */

h1, h2, h3 {
  font-family: var(--mono);
  line-height: 1.25;
  letter-spacing: 0.01em;
}

h1 { font-size: 1.7rem; margin: 0 0 0.5rem; }

h2 {
  font-size: 1.15rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 2.2rem 0 0.8rem;
  border-bottom: 1px solid var(--line);
  padding-bottom: 0.25rem;
}

/* section numbers like "§2" drawn from a counter */
article { counter-reset: section; }

article h2::before {
  counter-increment: section;
  content: counter(section) ". ";
  color: var(--ink-faint);
}

h3 { font-size: 1rem; margin: 1.6rem 0 0.5rem; }

a { color: var(--draft-blue); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--red-pencil); }

mark {
  background: transparent;
  color: var(--red-pencil);
  font-style: italic;
}

hr {
  border: none;
  border-top: 1px dashed var(--ink-faint);
  margin: 2.5rem 0;
}

/* ---- post metadata strip ------------------------------------ */

.post-meta {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-faint);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 2rem;
}

.post-meta .ref { color: var(--ink-faint); font-weight: 700; }

/* ---- index: entry cards (newest first) ----------------------- */

.entry {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 1.1rem 1.3rem 1.2rem;
  margin-bottom: 1.6rem;
}

.entry .entry-meta {
  font-family: var(--mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
  margin: 0 0 0.3rem;
}

.entry .entry-meta .ref { color: var(--ink-faint); font-weight: 700; }

.entry h2.entry-title {
  margin: 0 0 0.5rem;
  border-bottom: none;
  padding-bottom: 0;
  text-transform: none;
  font-size: 1.25rem;
}

.entry h2.entry-title::before { content: none; counter-increment: none; }

.entry h2.entry-title a { text-decoration: none; color: var(--ink); }
.entry h2.entry-title a:hover { color: var(--red-pencil); }

.entry p { margin: 0 0 0.6rem; }

.entry .readmore {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
}

/* ---- pagination ----------------------------------------------- */

.pagination {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-family: var(--mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border-top: 1px dashed var(--ink-faint);
  padding-top: 0.8rem;
  margin-top: 2rem;
}

.pagination .disabled { color: var(--ink-faint); opacity: 0.5; }
.pagination a { text-decoration: none; }

/* ---- sidebar: project tracker --------------------------------- */

.tracker {
  border: 1px solid var(--line);
  background: var(--panel);
  font-family: var(--mono);
  position: sticky;
  top: 1.25rem;
}

.tracker-title {
  margin: 0;
  padding: 0.55rem 0.9rem;
  border-bottom: 1px solid var(--line);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.tracker ul { list-style: none; margin: 0; padding: 0; }

.tracker li {
  padding: 0.6rem 0.9rem;
  border-bottom: 1px solid var(--grid-major);
}

.tracker li:last-child { border-bottom: none; }

.tracker .ref {
  display: block;
  font-size: 0.68rem;
  color: var(--ink-faint);
  font-weight: 700;
  letter-spacing: 0.1em;
}

.tracker a {
  display: block;
  font-size: 0.85rem;
  text-decoration: none;
  margin: 0.1rem 0 0.2rem;
}

/* ---- datasheet-style tables ----------------------------------- */

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  background: var(--panel);
}

th, td {
  border: 1px solid var(--line);
  padding: 0.45rem 0.7rem;
  text-align: left;
  vertical-align: top;
}

th {
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-faint);
  font-weight: 600;
}

.post-table td.ref,
.post-table td.date {
  font-family: var(--mono);
  font-size: 0.8rem;
  white-space: nowrap;
}

.post-table td.ref { color: var(--ink-faint); font-weight: 700; }

.post-table .summary {
  display: block;
  font-size: 0.85rem;
  color: var(--ink-faint);
}

.status {
  font-family: var(--mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.status::before { content: "● "; }
.status.done { color: #3a7d44; }
.status.in-progress { color: var(--red-pencil); }
.status.on-hold { color: var(--ink-faint); }

/* ---- figures ------------------------------------------------- */

figure {
  margin: 1.8rem 0;
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 0.6rem;
}

figure img {
  display: block;
  width: 100%;
  height: auto;
}

figcaption {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-faint);
  padding-top: 0.55rem;
  text-align: center;
}

/* figures auto-number themselves: FIG. 1 — caption */
article { counter-reset: section fig; }

figcaption::before {
  counter-increment: fig;
  content: "FIG. " counter(fig) " — ";
  color: var(--ink-faint);
  font-weight: 700;
}

/* ---- code ----------------------------------------------------- */

code, pre {
  font-family: var(--mono);
  font-size: 0.85em;
  background: var(--code-bg);
}

code { padding: 0.1em 0.35em; border-radius: 2px; }

pre {
  border: 1px solid var(--line);
  border-left: 3px solid var(--draft-blue);
  padding: 0.9rem 1rem;
  overflow-x: auto;
  line-height: 1.5;
}

pre code { padding: 0; background: none; }

/* ---- footer --------------------------------------------------- */

footer {
  margin-top: 4rem;
  border-top: 1px solid var(--line);
  padding-top: 0.8rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-faint);
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.4rem;
}

footer a { color: var(--ink-faint); }
footer a:hover { color: var(--red-pencil); }

/* ---- small screens -------------------------------------------- */

@media (max-width: 600px) {
  .sheet { padding: 1.25rem 0.9rem 3rem; }
  .titleblock-name { font-size: 1.1rem; }
  .post-table td.date { white-space: normal; }
}