/* =========================================================================
   V6g · CALIBRATION
   The page is the instrument. Edge rulers, every type size labeled with
   its measurement, every color labeled with its hex, persistent 4px
   baseline, hairline red dimensions everywhere.
   ========================================================================= */

:root {
  --paper:      #F0EDE4;
  --paper-2:    #F7F4EB;
  --ink:        #1A1A1A;
  --ink-soft:   #3A3733;
  --ink-muted:  #7C7669;
  --rule:       #D6D0C0;
  --hairline:   #D14545;
  --chart:      #4A78A8;
  --dim:        #5A8A60;

  --bsl: 4px;
  --grid-major: 24px;

  --sans: 'Inter', -apple-system, Helvetica, Arial, sans-serif;
  --mono: 'IBM Plex Mono', SFMono-Regular, Menlo, Consolas, monospace;
}

*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0;
  padding: 36px 64px 0;
  background: var(--paper);
  background-image:
    /* baseline grid */
    linear-gradient(to bottom, transparent calc(var(--grid-major) - 1px), rgba(74, 120, 168, 0.07) calc(var(--grid-major) - 1px), rgba(74, 120, 168, 0.07) var(--grid-major));
  background-size: 100% var(--grid-major);
  background-position: 0 36px;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  font-variant-numeric: tabular-nums;
  cursor: crosshair;
}

p, h1, h2, h3, dl, dd, ol, ul, li { margin: 0; padding: 0; }
ol, ul { list-style: none; }

a {
  color: var(--hairline);
  text-decoration: none;
  border-bottom: 1px solid var(--hairline);
}
a:hover { background: var(--hairline); color: var(--paper); }

::selection { background: var(--hairline); color: var(--paper); }

/* =========================================================================
   TOP INSTRUMENT BAR
   ========================================================================= */

.instrument {
  border: 1px solid var(--ink);
  background: var(--paper-2);
  padding: 0;
  margin-bottom: 24px;
}
.instrument__row {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
}
.ind {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  padding: 7px 14px;
  border-right: 1px solid var(--rule);
  text-transform: uppercase;
  white-space: nowrap;
}
.ind:last-child { border-right: 0; }

/* =========================================================================
   EDGE RULERS
   ========================================================================= */

.ruler {
  position: fixed;
  top: 0; bottom: 0;
  width: 28px;
  z-index: 100;
  background: var(--paper);
  background-image:
    /* major tick every 24px (long red) */
    linear-gradient(to bottom, transparent calc(24px - 1px), var(--hairline) calc(24px - 1px), var(--hairline) 24px),
    /* minor tick every 4px (short grey) */
    linear-gradient(to bottom, transparent calc(4px - 1px), var(--ink-muted) calc(4px - 1px), var(--ink-muted) 4px);
  background-size:
    100% 24px,
    8px 4px;
  background-repeat: repeat-y, repeat-y;
  background-position: 0 0, 0 0;
  border-right: 1px solid var(--ink);
  pointer-events: none;
}
.ruler--left  { left: 0; }
.ruler--right { right: 0; border-right: 0; border-left: 1px solid var(--ink); }

@media (max-width: 720px) {
  body { padding: 28px 36px 0; }
  .ruler { width: 20px; }
}

/* =========================================================================
   SHEET / BLOCKS
   ========================================================================= */

.sheet {
  max-width: 980px;
  margin: 0 auto;
  position: relative;
}

.block {
  padding: 32px 0;
  position: relative;
}
.block--end { padding-bottom: 16px; }

.block__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding-bottom: 16px;
  margin-bottom: 24px;
  border-bottom: 1px dashed var(--rule);
  flex-wrap: wrap;
}

.kicker {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.10em;
  color: var(--hairline);
  text-transform: uppercase;
}
.kicker--end { color: var(--ink-muted); }

/* RULE separator with red label tag */
.rule {
  position: relative;
  border: 0;
  border-top: 1px solid var(--ink);
  margin: 24px 0;
  height: 0;
}
.rule::after {
  content: attr(data-label);
  position: absolute;
  top: 0;
  right: 0;
  transform: translateY(-50%);
  padding: 2px 8px;
  background: var(--paper);
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.10em;
  color: var(--hairline);
}

/* =========================================================================
   HERO / SUBJECT
   ========================================================================= */

.display {
  position: relative;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 68px;
  line-height: 64px;
  letter-spacing: -0.025em;
  color: var(--ink);
  margin-bottom: 24px;
  padding-left: 96px;
}
.display__measure {
  position: absolute;
  left: 0;
  top: 0;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--hairline);
  padding: 4px 8px;
  border: 1px solid var(--hairline);
  background: var(--paper);
  text-transform: uppercase;
}

.lede {
  position: relative;
  font-family: var(--sans);
  font-size: 17px;
  line-height: 24px;
  color: var(--ink-soft);
  margin-bottom: 28px;
  max-width: 60ch;
  padding-left: 96px;
}
.lede__measure {
  position: absolute;
  left: 0;
  top: 2px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--hairline);
  padding: 3px 8px;
  border: 1px solid var(--hairline);
  background: var(--paper);
  text-transform: uppercase;
}

.vitals {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border: 1px solid var(--ink);
  background: var(--paper-2);
}
.vitals > div {
  padding: 12px 14px;
  border-right: 1px solid var(--rule);
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.vitals > div:last-child { border-right: 0; }
.vitals dt {
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.14em;
  color: var(--ink-muted);
  text-transform: uppercase;
}
.vitals dd {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 18px;
  color: var(--ink);
}
.vitals .unit {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--hairline);
  letter-spacing: 0.08em;
}

@media (max-width: 720px) {
  .display { padding-left: 0; }
  .lede { padding-left: 0; }
  .display__measure, .lede__measure { position: static; display: inline-block; margin-bottom: 8px; }
  .vitals { grid-template-columns: 1fr 1fr; }
  .vitals > div:nth-child(2n) { border-right: 0; }
  .vitals > div { border-bottom: 1px solid var(--rule); }
}

/* =========================================================================
   PALETTE
   ========================================================================= */

.palette {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
}
.swatch {
  border: 1px solid var(--ink);
  background: var(--paper-2);
  display: flex;
  flex-direction: column;
}
.swatch__chip {
  height: 72px;
  border-bottom: 1px solid var(--ink);
}
.swatch__data { padding: 8px 10px; }
.swatch__name {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.10em;
  color: var(--ink);
  margin-bottom: 4px;
}
.swatch__hex {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--hairline);
  font-weight: 500;
}
.swatch__rgb {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--ink-muted);
}

@media (max-width: 720px) { .palette { grid-template-columns: 1fr 1fr; } }

/* =========================================================================
   CATALOG (work items)
   ========================================================================= */

.catalog {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.item {
  border: 1px solid var(--ink);
  background: var(--paper-2);
  padding: 16px 18px;
}
.item__hd {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 1px dashed var(--rule);
}
.item__no, .item__year {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.10em;
  color: var(--ink-muted);
}
.item__no { color: var(--hairline); }
.item__state {
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.14em;
  padding: 2px 6px;
  border: 1px solid currentColor;
  text-transform: uppercase;
}
.state--ok       { color: var(--dim); }
.state--archived { color: var(--chart); }
.state--retired  { color: var(--ink-muted); }

.item__title {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 19px;
  letter-spacing: -0.015em;
  margin-bottom: 6px;
  line-height: 1.2;
}
.item__desc {
  font-family: var(--sans);
  font-size: 13.5px;
  line-height: 1.45;
  color: var(--ink-soft);
  margin-bottom: 14px;
}
.item__measures {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0;
  border-top: 1px solid var(--rule);
  padding-top: 10px;
}
.item__measures > div { display: flex; flex-direction: column; gap: 2px; }
.item__measures dt {
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.12em;
  color: var(--ink-muted);
  text-transform: uppercase;
}
.item__measures dd {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--ink);
  font-weight: 500;
}

@media (max-width: 720px) {
  .catalog { grid-template-columns: 1fr; }
  .item__measures { grid-template-columns: repeat(3, 1fr); gap: 8px 4px; }
}

/* =========================================================================
   SCALE / WRITING TABLE
   ========================================================================= */

.scale {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--ink);
  background: var(--paper-2);
}
.scale th, .scale td {
  text-align: left;
  padding: 9px 12px;
  border-bottom: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 12px;
}
.scale th {
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-muted);
  background: var(--paper);
  border-bottom: 1px solid var(--ink);
}
.scale td:nth-child(3) {
  font-family: var(--sans);
  font-size: 14px;
  color: var(--ink);
}
.scale .num { text-align: right; font-variant-numeric: tabular-nums; color: var(--hairline); }
.scale tr:hover { background: var(--paper); }
.scale tbody tr:last-child td { border-bottom: 0; }

/* =========================================================================
   CONTACT
   ========================================================================= */

.contact {
  position: relative;
  font-family: var(--sans);
  font-size: 17px;
  line-height: 24px;
  color: var(--ink-soft);
  padding-left: 96px;
  max-width: 60ch;
}
.contact__measure {
  position: absolute;
  left: 0;
  top: 2px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--hairline);
  padding: 3px 8px;
  border: 1px solid var(--hairline);
  background: var(--paper);
  text-transform: uppercase;
}
.contact__rt {
  font-family: var(--mono);
  color: var(--chart);
  font-weight: 500;
}

@media (max-width: 720px) {
  .contact { padding-left: 0; }
  .contact__measure { position: static; display: inline-block; margin-bottom: 8px; }
}

/* =========================================================================
   TITLE BLOCK (engineering footer)
   ========================================================================= */

.title-block {
  max-width: 980px;
  margin: 32px auto 48px;
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  border: 1.5px solid var(--ink);
}
.title-block__col {
  padding: 8px 12px;
  border-right: 1px solid var(--ink);
  background: var(--paper-2);
}
.title-block__col:last-child { border-right: 0; }
.tb__l {
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.14em;
  color: var(--ink-muted);
  text-transform: uppercase;
  margin-bottom: 2px;
}
.tb__v {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 12.5px;
  color: var(--ink);
}

@media (max-width: 720px) {
  .title-block { grid-template-columns: repeat(3, 1fr); }
  .title-block__col:nth-child(3n) { border-right: 0; }
  .title-block__col { border-bottom: 1px solid var(--ink); }
}