/* ETALYN GRADE MARK SYSTEM — document register
   The design language derives downward from the mark: the mark's ink, paper,
   hairline weight and 4-unit grid set every token below. Nothing decorative. */

:root {
  --paper: #F4F2ED;
  --paper-2: #EEEBE4;
  --paper-3: #E5E2D9;
  --ink: #0B0B0A;
  --ink-80: #2B2C28;
  --muted: #55584F;
  --rule: #C7C4BA;
  --rule-strong: #9A978D;
  --accent: #0F6B52;

  /* Tier is not colour-coded. Kept as variables so any surface still
     referencing them resolves to ink instead of to a traffic light. */
  --tier-a: #0B0B0A; --tier-b: #0B0B0A; --tier-c: #0B0B0A;
  --tier-d: #0B0B0A; --tier-e: #0B0B0A;
  --p4: #0B0B0A; --p3: #3D4038; --p2: #6E7268; --p1: #C6C9C0; --p0: #F4F2ED;

  --serif: 'Newsreader', 'Times New Roman', Times, serif;
  --sans: 'IBM Plex Sans', system-ui, -apple-system, 'Segoe UI', Helvetica, Arial, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, 'SFMono-Regular', Menlo, Consolas, monospace;

  --gut: 24px;
  --maxw: 1240px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.6;
  font-variant-numeric: tabular-nums lining-nums;
  text-rendering: optimizeLegibility;
}
@media (max-width: 700px) { body { font-size: 16px; } }

/* ------------------------------------------------------------- primitives */
a { color: var(--ink); text-decoration: underline; text-underline-offset: 2px; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.skip {
  position: absolute; left: -9999px; top: 0; background: var(--ink); color: var(--paper);
  padding: 8px 14px; font-family: var(--mono); font-size: 12px; z-index: 100;
}
.skip:focus { left: 8px; top: 8px; }

h1, h2, h3, h4 { font-weight: 500; margin: 0; }
h1 { font-family: var(--serif); font-size: clamp(30px, 4.4vw, 46px); line-height: 1.05; letter-spacing: -0.015em; }
h2 { font-family: var(--serif); font-size: clamp(22px, 2.6vw, 29px); line-height: 1.12; letter-spacing: -0.01em; }
h3 { font-family: var(--sans); font-size: 15px; font-weight: 600; letter-spacing: 0.02em; }
h4 { font-family: var(--mono); font-size: 11.5px; font-weight: 500; letter-spacing: 0.11em; text-transform: uppercase; color: var(--muted); }
p { margin: 0 0 0.85em; max-width: 74ch; }
p.lead { font-size: 1.16em; line-height: 1.42; }
small, .small { font-size: 13px; }

.mono { font-family: var(--mono); }
.sans { font-family: var(--sans); }
.u { color: var(--muted); }
.tnum { font-variant-numeric: tabular-nums; }

/* ------------------------------------------------------------ page frame */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gut); }

.masthead { border-bottom: 2px solid var(--ink); }
.masthead-top {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 10px 0; border-bottom: 1px solid var(--rule);
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.06em; color: var(--muted);
  text-transform: uppercase; flex-wrap: wrap;
}
.masthead-top .lk { display: flex; align-items: center; gap: 10px; color: var(--ink); }
.masthead-body { padding: 26px 0 20px; display: grid; grid-template-columns: minmax(0,1fr) 300px; gap: 40px; }
@media (max-width: 860px) { .masthead-body { grid-template-columns: 1fr; gap: 22px; } }

/* document furniture: the institutional signal set */
.furniture { border-top: 1px solid var(--ink); }
.furniture dl { margin: 0; display: grid; grid-template-columns: 1fr; }
.furniture div {
  display: grid; grid-template-columns: 96px 1fr; gap: 10px;
  padding: 5px 0; border-bottom: 1px solid var(--rule);
  font-family: var(--mono); font-size: 11.5px; line-height: 1.35;
}
.furniture dt { color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; }
.furniture dd { margin: 0; }

.illus {
  display: inline-block; font-family: var(--mono); font-size: 10px; letter-spacing: 0.1em;
  text-transform: uppercase; border: 1px solid var(--rule-strong); color: var(--muted);
  padding: 2px 6px; background: var(--paper-2);
}
.illus-bar {
  background: var(--ink); color: var(--paper); font-family: var(--mono); font-size: 11px;
  letter-spacing: 0.08em; padding: 7px 0; text-transform: uppercase;
}

/* --------------------------------------------------------------- nav */
.tocnav {
  position: sticky; top: 0; z-index: 40; background: var(--paper);
  border-bottom: 1px solid var(--ink); box-shadow: 0 1px 0 var(--paper);
}
.tocnav ul { list-style: none; margin: 0; padding: 0; display: flex; gap: 0; overflow-x: auto; }
.tocnav li { flex: 0 0 auto; }
.tocnav a {
  display: block; padding: 9px 13px; font-family: var(--mono); font-size: 11px;
  letter-spacing: 0.07em; text-transform: uppercase; text-decoration: none;
  color: var(--muted); border-right: 1px solid var(--rule); white-space: nowrap;
}
.tocnav a:hover, .tocnav a:focus-visible { background: var(--ink); color: var(--paper); }

/* ------------------------------------------------------------ sections */
section { border-top: 1px solid var(--ink); padding: 40px 0 46px; scroll-margin-top: 46px; }
.sec-head { display: grid; grid-template-columns: 84px minmax(0,1fr); gap: 24px; margin-bottom: 26px; }
.sec-num { font-family: var(--mono); font-size: 12px; letter-spacing: 0.08em; color: var(--muted); padding-top: 8px; }
.sec-head p { margin-top: 10px; }
@media (max-width: 700px) {
  .sec-head { grid-template-columns: 1fr; gap: 6px; }
  section { padding: 28px 0 32px; }
}

.cols2 > *, .cols3 > *, .builder > *, .verify-grid > *, .do-dont > *, .typespec > * { min-width: 0; }
.cols2 { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: 28px; }
.cols3 { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 22px; }
@media (max-width: 900px) { .cols3 { grid-template-columns: minmax(0,1fr); } }
@media (max-width: 760px) { .cols2 { grid-template-columns: minmax(0,1fr); } }

/* ------------------------------------------------------------- tables */
table { width: 100%; border-collapse: collapse; font-family: var(--sans); font-size: 13.5px; }
caption {
  text-align: left; font-family: var(--mono); font-size: 11px; letter-spacing: 0.09em;
  text-transform: uppercase; color: var(--muted); padding-bottom: 7px;
}
thead th {
  text-align: left; font-weight: 600; font-size: 11px; letter-spacing: 0.07em; text-transform: uppercase;
  font-family: var(--mono); color: var(--ink); border-bottom: 1.5px solid var(--ink);
  padding: 6px 12px 6px 0; vertical-align: bottom;
}
tbody td, tbody th {
  text-align: left; font-weight: 400; vertical-align: top;
  border-bottom: 1px solid var(--rule); padding: 8px 12px 8px 0; line-height: 1.35;
}
tbody tr:hover { background: var(--paper-2); }
td.num, th.num { text-align: right; font-family: var(--mono); font-variant-numeric: tabular-nums; padding-right: 18px; }
tbody tr td:last-child, thead tr th:last-child { padding-right: 0; }
td.mk { width: 1%; white-space: nowrap; padding-right: 14px; }
.table-scroll { overflow-x: auto; }
.table-note {
  font-family: var(--mono); font-size: 11px; color: var(--muted); line-height: 1.45;
  border-top: 1px solid var(--rule); padding-top: 6px; margin-top: 0;
}

/* footnote apparatus */
.fn { border-top: 1px solid var(--ink); margin-top: 22px; padding-top: 8px; }
.fn ol { margin: 0; padding-left: 18px; font-size: 12.5px; line-height: 1.45; color: var(--ink-80); }
.fn li { margin-bottom: 4px; }
sup.fnref { font-family: var(--mono); font-size: 9.5px; vertical-align: super; }

/* ------------------------------------------------------------- builder */
.builder { display: grid; grid-template-columns: 320px minmax(0,1fr); gap: 0; border: 1px solid var(--ink); }
@media (max-width: 900px) { .builder { grid-template-columns: minmax(0,1fr); } }
.builder-controls { border-right: 1px solid var(--ink); padding: 18px; background: var(--paper-2); }
@media (max-width: 900px) { .builder-controls { border-right: 0; border-bottom: 1px solid var(--ink); } }
.builder-stage { padding: 18px; }
fieldset { border: 0; border-top: 1px solid var(--rule); margin: 0 0 14px; padding: 10px 0 0; }
fieldset:first-of-type { border-top: 0; padding-top: 0; }
legend {
  font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--muted); padding: 0 6px 0 0;
}
.segbar { display: flex; flex-wrap: wrap; gap: 4px; }
.segbar label {
  position: relative; display: inline-flex; align-items: center; justify-content: center;
  min-width: 44px; min-height: 34px; padding: 4px 8px; cursor: pointer;
  border: 1px solid var(--rule-strong); background: var(--paper);
  font-family: var(--mono); font-size: 12.5px; letter-spacing: 0.04em;
}
.segbar input { position: absolute; opacity: 0; width: 100%; height: 100%; margin: 0; cursor: pointer; }
.segbar label:has(input:checked) { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.segbar label:has(input:focus-visible) { outline: 2px solid var(--accent); outline-offset: 2px; }
.ctl-row { display: flex; align-items: center; gap: 10px; margin-top: 8px; }
.ctl-row label { font-family: var(--mono); font-size: 11px; text-transform: uppercase; letter-spacing: 0.07em; color: var(--muted); }
input[type="text"], select {
  font-family: var(--mono); font-size: 13px; padding: 7px 8px; min-height: 36px;
  border: 1px solid var(--rule-strong); background: var(--paper); color: var(--ink); width: 100%;
}
input[type="range"] { width: 100%; accent-color: var(--accent); min-height: 30px; }
.stage-canvas {
  border: 1px solid var(--rule); background: var(--paper);
  min-height: 150px; display: flex; align-items: center; justify-content: center; padding: 22px 12px;
}
.stage-canvas.on-ink { background: var(--ink); }
.stage-meta {
  display: flex; flex-wrap: wrap; gap: 0 26px; font-family: var(--mono); font-size: 11.5px;
  color: var(--muted); border-top: 1px solid var(--rule); margin-top: 12px; padding-top: 8px;
}
.stage-meta b { color: var(--ink); font-weight: 500; }
.codebox {
  width: 100%; min-height: 108px; font-family: var(--mono); font-size: 11px; line-height: 1.4;
  border: 1px solid var(--rule-strong); background: var(--paper-2); color: var(--ink-80);
  padding: 8px; resize: vertical; margin-top: 12px;
}
.btn {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase;
  background: var(--ink); color: var(--paper); border: 1px solid var(--ink);
  padding: 8px 12px; min-height: 36px; cursor: pointer;
}
.btn:hover { background: var(--paper); color: var(--ink); }

/* --------------------------------------------------------------- grids */
.markgrid { display: grid; gap: 1px; background: var(--rule); border: 1px solid var(--rule); }
.markgrid .cell { background: var(--paper); padding: 12px 10px; display: flex; flex-direction: column; align-items: center; gap: 9px; }
.cell .lbl { font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.06em; color: var(--muted); text-align: center; line-height: 1.3; }
.g5 { grid-template-columns: repeat(5, minmax(0,1fr)); }
@media (max-width: 620px) { .g5 { grid-template-columns: repeat(2, minmax(0,1fr)); } }

.matrix { border-collapse: collapse; font-family: var(--mono); font-size: 11px; }
.matrix th { font-family: var(--mono); font-size: 11px; letter-spacing: 0.06em; color: var(--muted); font-weight: 500; padding: 5px 8px; }
.matrix td { border: 1px solid var(--rule); padding: 7px 8px; text-align: center; }
.matrix thead th { border-bottom: 1.5px solid var(--ink); text-transform: none; }

.ladder { display: flex; align-items: flex-end; gap: 26px; flex-wrap: wrap; border: 1px solid var(--rule); padding: 20px 18px; }
.ladder .rung { display: flex; flex-direction: column; align-items: center; gap: 10px; }

.swatch-ink { background: var(--ink); padding: 20px 18px; }
.swatch-ink .lbl { color: var(--rule-strong); }

/* ------------------------------------------------------------ specimens */
.spec { border: 1px solid var(--ink); background: var(--paper); }
.spec-head {
  display: flex; justify-content: space-between; align-items: baseline; gap: 12px;
  background: var(--ink); color: var(--paper); padding: 6px 12px;
  font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.09em; text-transform: uppercase;
}
.spec-body { padding: 18px; }
.spec-note { font-family: var(--mono); font-size: 11px; color: var(--muted); padding: 8px 12px; border-top: 1px solid var(--rule); line-height: 1.45; }

/* simulated third-party surfaces — deliberately NOT in Etalyn's design language */
.sim-journal { background: #fff; color: #111; font-family: 'Times New Roman', Times, serif; padding: 22px 20px; }
.sim-journal .jtitle { font-size: 15px; font-weight: 700; margin-bottom: 4px; }
.sim-journal .jmeta { font-size: 11px; color: #444; margin-bottom: 14px; font-style: italic; }
.sim-journal p { font-size: 13px; line-height: 1.5; margin: 0 0 10px; }
.sim-journal .jrefs { border-top: 1px solid #999; margin-top: 12px; padding-top: 8px; }
.sim-journal .jrefs li { font-size: 11.5px; line-height: 1.5; margin-bottom: 7px; }

.sim-retail { background: #fff; color: var(--ink); font-family: var(--sans); padding: 18px; }
.sim-retail .price { font-size: 26px; font-weight: 700; letter-spacing: -0.02em; }
.sim-retail .pname { font-size: 17px; font-weight: 600; margin-bottom: 2px; }
.sim-retail .stars { color: var(--muted); font-size: 13px; letter-spacing: 2px; }
.sim-retail .buy {
  background: var(--ink); color: #fff; border: 0; padding: 11px 16px; font-family: var(--sans);
  font-size: 13px; font-weight: 600; width: 100%; margin-top: 12px; border-radius: 3px; cursor: pointer;
}
.sim-retail .thumb { background: var(--paper-2); border: 1px solid #DDD; aspect-ratio: 1/1; }

.sim-slide { background: var(--paper); color: var(--ink); font-family: var(--sans); aspect-ratio: 16/9; padding: 26px 28px; display: flex; flex-direction: column; }
.sim-slide .stitle { font-size: clamp(16px, 2.4vw, 26px); font-weight: 700; letter-spacing: -0.02em; line-height: 1.1; }
.sim-slide ul { font-size: clamp(11px, 1.25vw, 14px); line-height: 1.55; padding-left: 18px; margin: 12px 0 0; }
.sim-slide .sfoot { margin-top: auto; display: flex; align-items: center; gap: 10px; border-top: 1px solid var(--rule); padding-top: 9px; font-size: 10.5px; color: var(--muted); }

.sim-print { background: #fff; color: #000; padding: 24px 22px; font-family: 'Times New Roman', Times, serif; filter: grayscale(1); }
.sim-print .ptitle { font-size: 13px; font-weight: 700; letter-spacing: 0.04em; text-transform: uppercase; border-bottom: 1px solid #000; padding-bottom: 5px; }
.sim-print table { font-family: 'Times New Roman', Times, serif; font-size: 11.5px; }
.sim-print thead th { font-family: 'Times New Roman', Times, serif; font-size: 10.5px; border-bottom: 1px solid #000; letter-spacing: 0.04em; }
.sim-print tbody td { border-bottom: 1px solid #BBB; font-size: 11.5px; }

.sim-cite { background: #fff; color: #111; font-family: var(--mono); font-size: 12px; line-height: 1.65; padding: 18px; }

/* verification page specimen */
.verify {
  border: 1px solid var(--ink); background: var(--paper);
}
.verify-url {
  background: var(--paper-3); border-bottom: 1px solid var(--ink); padding: 7px 12px;
  font-family: var(--mono); font-size: 11.5px; color: var(--ink-80); overflow-x: auto; white-space: nowrap;
}
.verify-status {
  display: flex; align-items: center; gap: 12px; padding: 12px; border-bottom: 1px solid var(--ink);
  background: var(--accent); color: #fff; font-family: var(--mono); font-size: 13px; letter-spacing: 0.05em;
}
.verify-status.stale { background: var(--ink); }
.verify-status .big { font-size: 15px; font-weight: 500; letter-spacing: 0.08em; text-transform: uppercase; }
.verify-grid { display: grid; grid-template-columns: minmax(0,1.35fr) minmax(0,1fr); }
@media (max-width: 820px) { .verify-grid { grid-template-columns: minmax(0,1fr); } }
.verify-main { padding: 16px; border-right: 1px solid var(--rule); }
.verify-side { padding: 16px; background: var(--paper-2); }
@media (max-width: 820px) { .verify-main { border-right: 0; border-bottom: 1px solid var(--rule); } }

.kv { display: grid; grid-template-columns: 128px minmax(0,1fr); gap: 0 12px; font-family: var(--mono); font-size: 12px; }
.kv dt { color: var(--muted); padding: 5px 0; border-bottom: 1px solid var(--rule); text-transform: uppercase; font-size: 10.5px; letter-spacing: 0.06em; }
.kv dd { margin: 0; padding: 5px 0; border-bottom: 1px solid var(--rule); }

.wwcta { border: 1px solid var(--ink); border-left: 4px solid var(--ink); padding: 14px 16px; background: var(--paper-2); }
.wwcta h4 { margin-bottom: 6px; color: var(--ink); }
.wwcta ul { margin: 0; padding-left: 18px; font-size: 14px; line-height: 1.45; }
.wwcta li { margin-bottom: 4px; }

.callout { border-top: 2px solid var(--ink); border-bottom: 1px solid var(--ink); padding: 12px 0; }

ul.rulelist { list-style: none; margin: 0; padding: 0; }
ul.rulelist li {
  position: relative; padding: 8px 0 8px 34px;
  border-bottom: 1px solid var(--rule); font-size: 14.5px; line-height: 1.4;
}
ul.rulelist li::before {
  content: counter(li-c, decimal-leading-zero); counter-increment: li-c;
  position: absolute; left: 0; top: 11px;
  font-family: var(--mono); font-size: 11px; color: var(--muted);
}
ul.rulelist { counter-reset: li-c; }

.do-dont { display: grid; grid-template-columns: 1fr 1fr; gap: 0; border: 1px solid var(--ink); }
@media (max-width: 700px) { .do-dont { grid-template-columns: minmax(0,1fr); } }
.do-dont > div { padding: 14px 16px; }
.do-dont > div:first-child { border-right: 1px solid var(--ink); }
@media (max-width: 700px) { .do-dont > div:first-child { border-right: 0; border-bottom: 1px solid var(--ink); } }
.do-dont ul { margin: 8px 0 0; padding-left: 17px; font-size: 13.5px; line-height: 1.45; }
.do-dont li { margin-bottom: 5px; }

.typespec { border-top: 1px solid var(--rule); padding: 12px 0; display: grid; grid-template-columns: 150px minmax(0,1fr); gap: 18px; }
@media (max-width: 700px) { .typespec { grid-template-columns: minmax(0,1fr); gap: 6px; } }
.typespec .meta { font-family: var(--mono); font-size: 10.5px; color: var(--muted); line-height: 1.5; letter-spacing: 0.04em; }

.pal { display: grid; grid-template-columns: repeat(5, 1fr); gap: 1px; background: var(--rule); border: 1px solid var(--rule); }
@media (max-width: 620px) { .pal { grid-template-columns: repeat(2, 1fr); } }
.pal .chip { background: var(--paper); }
.pal .chip .block { height: 54px; }
.pal .chip .info { padding: 7px 8px; font-family: var(--mono); font-size: 10.5px; line-height: 1.45; color: var(--muted); }
.pal .chip .info b { display: block; color: var(--ink); font-weight: 500; }

footer.colophon { border-top: 2px solid var(--ink); padding: 26px 0 60px; font-family: var(--mono); font-size: 11.5px; color: var(--muted); line-height: 1.6; }
footer.colophon a { color: var(--ink); }

.hr-thin { border: 0; border-top: 1px solid var(--rule); margin: 20px 0; }
.mb0 { margin-bottom: 0; }
.mt16 { margin-top: 16px; } .mt24 { margin-top: 24px; } .mt32 { margin-top: 32px; }
.inline-mark { display: inline-block; vertical-align: -3px; }
.nowrap { white-space: nowrap; }

@media print {
  .tocnav, .builder-controls, .btn { display: none; }
  body { background: #fff; }
}

/* --------------------------------------------- mobile safety net */
.mono, code, .fn ol li, .table-note { overflow-wrap: anywhere; }
@media (max-width: 560px) {
  .verify-head { flex-wrap: wrap; row-gap: 6px; }
  .kv { grid-template-columns: minmax(0,1fr); gap: 2px; }
  .kv dt { padding-top: 8px; }
  .kv dd { padding-bottom: 8px; }
}

/* ============================================ retail reduction layer (§08–§11) */
.band-row { display: grid; grid-template-columns: 1fr; gap: 14px; }
.band-cell { border: 1px solid var(--rule); background: var(--paper-2); padding: 14px; }
.band-cell .bmeta { font-family: var(--mono); font-size: 11px; color: var(--muted);
  letter-spacing: 0.06em; text-transform: uppercase; margin-bottom: 9px; }
.band-cell .bwhen { font-size: 14px; line-height: 1.45; margin-top: 10px; color: var(--ink-80); }
.band-hold { line-height: 0; display: block; }
.band-hold svg { max-width: 100%; height: auto; }

.chan { display: grid; grid-template-columns: 1fr; gap: 0; border-top: 1px solid var(--ink); }
.chan > div { display: grid; grid-template-columns: 26px 128px 1fr; gap: 12px; padding: 9px 0;
  border-bottom: 1px solid var(--rule); font-size: 14px; line-height: 1.45; }
.chan .cno { font-family: var(--mono); font-size: 12px; color: var(--muted); }
.chan .cname { font-family: var(--mono); font-size: 12px; letter-spacing: 0.06em;
  text-transform: uppercase; }

.rulelist-num { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--ink); }
.rulelist-num li { display: grid; grid-template-columns: 42px 1fr 200px; gap: 12px;
  padding: 8px 0; border-bottom: 1px solid var(--rule); font-size: 14px; line-height: 1.45; }
.rulelist-num .rn { font-family: var(--mono); font-size: 12px; letter-spacing: 0.05em; color: var(--muted); }
.rulelist-num .ro { font-family: var(--mono); font-size: 12px; }
.rulelist-num li.hot { background: var(--paper-3); }
.rulelist-num li.hot .rn { color: var(--accent); }

.derive { border: 1px solid var(--ink); background: var(--paper); }
.derive-controls { padding: 16px 18px; border-bottom: 1px solid var(--rule); }
.derive-out { padding: 18px; display: grid; grid-template-columns: 1fr; gap: 20px; }
.derive-panel { border: 1px solid var(--rule); padding: 14px; background: var(--paper-2); }
.derive-panel h5 { font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--muted); margin: 0 0 10px; font-weight: 400; }
.fired { font-family: var(--mono); font-size: 12.5px; line-height: 1.6; }
.fired b { font-size: 15px; }
.rulebig { display: inline-block; background: var(--ink); color: var(--paper);
  font-family: var(--mono); font-size: 13px; padding: 3px 9px; letter-spacing: 0.06em; }

.rmatrix { border-collapse: collapse; width: 100%; }
.rmatrix th, .rmatrix td { border: 1px solid var(--rule); padding: 5px; text-align: center;
  font-family: var(--mono); font-size: 11px; }
.rmatrix thead th { background: var(--paper-3); }
.rmatrix td .rr { display: block; color: var(--muted); font-size: 10px; margin-top: 3px; }
.rmatrix td svg { display: block; margin: 0 auto; }

/* simulated commercial surfaces */
.carton { background: #fff; color: var(--ink); font-family: var(--sans);
  border: 1px solid var(--rule); padding: 6mm 5mm; }
.carton .cbrand { font-family: var(--mono); font-size: 8pt; letter-spacing: 0.16em;
  text-transform: uppercase; color: #666; }
.carton .cprod { font-size: 12pt; font-weight: 700; line-height: 1.15; margin: 2px 0 5px; }
.carton .cpanel { font-size: 6.5pt; line-height: 1.4; color: #222; }
.carton table { width: 100%; border-collapse: collapse; font-size: 6.5pt; margin: 4px 0; }
.carton td { border-bottom: 0.5px solid #BBB; padding: 1.5px 0; }
.carton .cband { margin: 4mm 0 2mm; line-height: 0; }
.carton .cband svg { width: 46mm; height: auto; }

.phone { width: 375px; max-width: 100%; margin: 0 auto; border: 1px solid var(--rule);
  background: #fff; overflow: hidden; }
.phone .pbar { background: var(--ink); color: #fff; font-family: var(--sans); font-size: 11px;
  padding: 7px 12px; display: flex; justify-content: space-between; }
.phone .sim-retail .rb { line-height: 0; margin: 12px 0 6px; }
.phone .sim-retail .rb svg { width: 100%; height: auto; max-width: 339px; }

.shelf { background: #fff; color: #000; filter: grayscale(1); border: 1px solid #999;
  padding: 10px 12px; font-family: Arial, Helvetica, sans-serif; }
.shelf .sprice { font-size: 30px; font-weight: 700; line-height: 1; }
.shelf .sname { font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.02em; }
.shelf .smeta { font-size: 9px; color: #333; line-height: 1.35; }
.shelf .sband { line-height: 0; margin-top: 8px; }
.shelf .sband svg { width: 100%; height: auto; max-width: 260px; }
.shelf .sbar { font-family: 'Courier New', monospace; font-size: 9px; letter-spacing: 0.04em; }

.sbs { display: grid; grid-template-columns: 1fr; gap: 16px; align-items: start; }
.sbs-cell { border: 1px solid var(--rule); background: var(--paper-2); padding: 16px; }
.sbs-cell .lab { font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.1em;
  text-transform: uppercase; color: var(--muted); margin-bottom: 12px; }
.sbs-cell .mkhold { line-height: 0; display: block; }
.sbs-cell .mkhold svg { max-width: 100%; height: auto; }
.sbs-cell p { font-size: 13.5px; line-height: 1.5; margin: 12px 0 0; color: var(--ink-80); }

.truescale { border: 1px dashed var(--rule-strong); padding: 12px; background: var(--paper);
  display: inline-block; line-height: 0; }
.truescale + .truescale { margin-left: 10px; }
.sizecap { font-family: var(--mono); font-size: 10.5px; color: var(--muted);
  letter-spacing: 0.06em; text-transform: uppercase; margin-top: 8px; line-height: 1.4; }

.showpair { display: grid; grid-template-columns: 1fr; gap: 22px; }
.showcard { border: 1px solid var(--ink); background: var(--paper); }
.showcard .sh-head { background: var(--ink); color: var(--paper); padding: 8px 14px;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.09em; text-transform: uppercase;
  display: flex; justify-content: space-between; gap: 10px; flex-wrap: wrap; }
.showcard .sh-body { padding: 18px; }
.wrongband { border: 1px solid var(--rule-strong); background: var(--paper-3); padding: 14px; }
.wrongband .wl { font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.09em;
  text-transform: uppercase; color: var(--muted); margin-bottom: 10px; }
.wrongband .strike { position: relative; display: inline-block; line-height: 0; opacity: 0.55; }
.stat { display: grid; grid-template-columns: 1fr; gap: 0; border-top: 1px solid var(--ink); margin-top: 4px; }
.stat > div { display: grid; grid-template-columns: 1fr auto; gap: 12px; padding: 7px 0;
  border-bottom: 1px solid var(--rule); font-size: 13.5px; }
.stat .sv { font-family: var(--mono); font-variant-numeric: tabular-nums; }

@media (min-width: 760px) {
  .band-row { grid-template-columns: 1fr 1fr; }
  .derive-out { grid-template-columns: 1fr 1fr; }
  .sbs { grid-template-columns: 1fr 1fr; }
  .showpair { grid-template-columns: 1fr 1fr; }
}

/* The section strip gained cross-document links and no longer fits one line on
   a desktop viewport. It wraps rather than scrolling, so no tab is ever cut off
   mid-word; below 720px it keeps the original single-line scroll. */
@media (min-width: 721px) {
  .tocnav ul { flex-wrap: wrap; overflow-x: visible; }
  .tocnav li { border-bottom: 1px solid var(--rule); }
}