/* ============================================================
   geokkjer.eu — swiss datasheet, dual theme
   light: ruled paper, hairlines, swiss red
   dark:  console charcoal, hairlines, phosphor amber
   ============================================================ */

:root {
  color-scheme: light;

  --bg-page: #f4f2ec;
  --bg-sheet: #f4f2ec;
  --ink: #141414;
  --body-soft: #33312c;
  --dim: #6d6a62;
  --rule: #141414;
  --rule-soft: rgba(20, 20, 20, 0.16);
  --accent: #e32213;
  --status: #e32213;
  --grid-line: rgba(20, 20, 20, 0.034);
  --photo-filter: grayscale(100%) sepia(0.28) contrast(1.05);
  --sheet-shadow: none;
  --sel-bg: #e32213;
  --sel-fg: #f4f2ec;
}

[data-theme="dark"] {
  color-scheme: dark;

  --bg-page: #0b0e0d;
  --bg-sheet: #111514;
  --ink: #e4e1d5;
  --body-soft: #b3b0a4;
  --dim: #8a918b;
  --rule: #39423d;
  --rule-soft: rgba(228, 225, 213, 0.18);
  --accent: #e8a33d;
  --status: #79b473;
  --grid-line: rgba(228, 225, 213, 0.028);
  --photo-filter: grayscale(100%) sepia(0.34) contrast(1.02) brightness(0.9);
  --sheet-shadow: 0 24px 80px rgba(0, 0, 0, 0.55);
  --sel-bg: #e8a33d;
  --sel-fg: #0b0e0d;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  background: var(--bg-page);
  /* engineering graph-paper */
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 8px 8px;
  color: var(--ink);
  font-family: "Archivo", sans-serif;
  font-size: 1rem;
  line-height: 1.5;
  padding: clamp(0.75rem, 2.5vw, 2.5rem);
  transition: background-color 0.25s ease, color 0.25s ease;
}

::selection { background: var(--sel-bg); color: var(--sel-fg); }

a { color: inherit; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

/* ---------- sheet ---------- */

.sheet {
  max-width: 68rem;
  margin-inline: auto;
  border: 2px solid var(--rule);
  background: var(--bg-sheet);
  box-shadow: var(--sheet-shadow);
  transition: background-color 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

/* ---------- masthead ---------- */

.masthead {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem;
  padding: clamp(1.5rem, 4vw, 3rem);
  border-bottom: 2px solid var(--rule);
}

.doc-no {
  font-family: "Chivo Mono", monospace;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 1.2rem;
}

h1 {
  font-family: "Archivo", sans-serif;
  font-variation-settings: "wdth" 110;
  font-weight: 800;
  font-size: clamp(2.2rem, 7vw, 5.5rem);
  line-height: 0.92;
  letter-spacing: -0.025em;
  text-transform: uppercase;
}

.role {
  margin-top: 1rem;
  font-family: "Chivo Mono", monospace;
  font-size: 0.9rem;
  border-left: 4px solid var(--accent);
  padding-left: 0.8rem;
}

.masthead-fig { align-self: start; }

.masthead-fig img {
  display: block;
  width: clamp(8rem, 16vw, 11.5rem);
  aspect-ratio: 4 / 5;
  object-fit: cover;
  border: 2px solid var(--rule);
  filter: var(--photo-filter);
}

.masthead-fig figcaption {
  font-family: "Chivo Mono", monospace;
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  color: var(--dim);
  margin-top: 0.5rem;
  text-align: center;
}

/* ---------- meta strip ---------- */

.metastrip {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem 2rem;
  padding: 0.6rem clamp(1.5rem, 4vw, 3rem);
  border-bottom: 2px solid var(--rule);
  font-family: "Chivo Mono", monospace;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
}

.metastrip .status { display: inline-flex; align-items: center; gap: 0.5rem; color: var(--status); }
.metastrip .status i {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--status);
  animation: blink 2.4s steps(1) infinite;
}

@keyframes blink { 50% { opacity: 0.25; } }

.theme-toggle {
  font-family: "Chivo Mono", monospace;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--rule);
  padding: 0.2rem 0.7rem;
  cursor: pointer;
  transition: color 0.12s ease, border-color 0.12s ease;
}

.theme-toggle:hover { color: var(--accent); border-color: var(--accent); }

/* ---------- columns ---------- */

.columns {
  display: grid;
  grid-template-columns: 16rem 1fr;
}

/* left rail */

.rail {
  border-right: 2px solid var(--rule);
  padding: clamp(1.5rem, 3vw, 2.5rem) 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.rail-label {
  font-family: "Chivo Mono", monospace;
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  color: var(--dim);
  margin-bottom: 0.7rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--rule);
}

.toc { display: flex; flex-direction: column; }

.toc a {
  font-family: "Chivo Mono", monospace;
  font-size: 0.85rem;
  color: var(--ink);
  text-decoration: none;
  padding: 0.45rem 0;
  border-bottom: 1px solid var(--rule-soft);
  display: flex;
  justify-content: space-between;
  transition: color 0.12s ease, padding-left 0.12s ease;
}

.toc a span { color: var(--accent); }
.toc a:hover { color: var(--accent); padding-left: 0.35rem; }

.rail-value {
  font-family: "Archivo", sans-serif;
  font-variation-settings: "wdth" 76;
  font-weight: 700;
  font-size: 1.15rem;
  line-height: 1.25;
  text-transform: uppercase;
}

.chips { font-family: "Chivo Mono", monospace; font-size: 0.78rem; line-height: 2; color: var(--ink); }

/* right content */

.content { padding: clamp(1.5rem, 3.5vw, 3rem); min-width: 0; }

.content section + section {
  margin-top: clamp(2rem, 4vw, 3rem);
  padding-top: clamp(1.5rem, 3vw, 2rem);
  border-top: 1px solid var(--rule);
}

.content h2 {
  font-family: "Chivo Mono", monospace;
  font-weight: 500;
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 1.3rem;
}

.content h2 em { font-style: normal; color: var(--accent); }

.big { font-size: 1.15rem; max-width: 42rem; }
.big + .big { margin-top: 0.8rem; }
.big strong { font-weight: 700; }

.content a, .big a {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 1.5px;
  text-underline-offset: 3px;
}
.content a:hover, .big a:hover { color: var(--accent); }

/* ---------- spec tables ---------- */

.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.spec-table tr { border-top: 1px solid var(--rule); }
.spec-table tr:last-child { border-bottom: 1px solid var(--rule); }

.spec-table th {
  text-align: left;
  font-family: "Chivo Mono", monospace;
  font-weight: 500;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  white-space: nowrap;
  padding: 0.85rem 1.5rem 0.85rem 0;
  vertical-align: top;
}

.spec-table th a { text-decoration: none; border-bottom: 1.5px solid var(--accent); }
.spec-table th a:hover { color: var(--accent); }

.spec-table td {
  padding: 0.85rem 0;
  vertical-align: top;
  color: var(--body-soft);
}

.spec-table td.lang {
  font-family: "Chivo Mono", monospace;
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: var(--dim);
  text-align: right;
  white-space: nowrap;
  padding-left: 1.5rem;
}

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

.sheetfoot {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 2rem;
  border-top: 2px solid var(--rule);
  padding: 0.6rem clamp(1.5rem, 4vw, 3rem);
  font-family: "Chivo Mono", monospace;
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: var(--dim);
}

.sheetfoot span:first-child { color: var(--accent); }

/* ---------- responsive ---------- */

@media (max-width: 780px) {
  .columns { grid-template-columns: 1fr; }
  .rail {
    border-right: none;
    border-bottom: 2px solid var(--rule);
    flex-direction: row;
    flex-wrap: wrap;
    gap: 1.5rem 2.5rem;
  }
  .rail > * { flex: 1 1 12rem; }
  .masthead { grid-template-columns: 1fr; }
  .masthead-fig { order: -1; justify-self: center; }
  .spec-table th { display: block; padding-bottom: 0.2rem; white-space: normal; }
  .spec-table td { display: block; padding-top: 0; }
  .spec-table td.lang { text-align: left; padding-left: 0; padding-bottom: 1rem; }
  .spec-table tr { display: block; padding: 0.6rem 0; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}