/* Simple Tensor — an engineering drawing sheet: a blueprint hero with an isometric tensor and dimension lines, a revision
   table, vellum sections with zone letters, a detail balloon, dimensioned measurements, a parts list, a title block */
@font-face { font-family: "Jura"; src: url("../assets/fonts/Jura-500.woff2") format("woff2"); font-weight: 500; font-display: swap; }
@font-face { font-family: "Jura"; src: url("../assets/fonts/Jura-700.woff2") format("woff2"); font-weight: 700; font-display: swap; }
@font-face { font-family: "Titillium Web"; src: url("../assets/fonts/TitilliumWeb-400.woff2") format("woff2"); font-weight: 400; font-display: swap; }
@font-face { font-family: "Titillium Web"; src: url("../assets/fonts/TitilliumWeb-600.woff2") format("woff2"); font-weight: 600; font-display: swap; }
@font-face { font-family: "Libre Caslon Text"; src: url("../assets/fonts/LibreCaslonText-400.woff2") format("woff2"); font-weight: 400; font-display: swap; }
@font-face { font-family: "Libre Caslon Text"; src: url("../assets/fonts/LibreCaslonText-400i.woff2") format("woff2"); font-weight: 400; font-style: italic; font-display: swap; }
@font-face { font-family: "Libre Caslon Text"; src: url("../assets/fonts/LibreCaslonText-700.woff2") format("woff2"); font-weight: 700; font-display: swap; }

:root {
  --blue: #173E66; --blue2: #1E4D7B; --blue3: #255C92; --line: #E8F1FA; --line2: #9DBEDD;
  --vellum: #F6F7F2; --vellum2: #ECEFE6; --grid: #DCE7EE; --ink: #13294B; --pencil: #5B6573; --red: #D33F2E; --yellow: #F7D046; --rule: #C9D3DC;
  --disp: "Jura", "Eurostile", "Arial Narrow", sans-serif;
  --body: "Titillium Web", system-ui, -apple-system, "Segoe UI", sans-serif;
  --serif: "Libre Caslon Text", Georgia, "Times New Roman", serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--vellum); color: var(--ink); font: 400 17px/1.6 var(--body); overflow-x: hidden; }
h1, h2, h3, h4, p { margin: 0 0 12px; }
a { color: var(--blue3); text-underline-offset: 3px; }
img, svg, canvas { max-width: 100%; }
:focus-visible { outline: 3px solid var(--yellow); outline-offset: 2px; }
code, pre { font-family: var(--mono); }
.sprite { position: absolute; }
.vh { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: 12px; top: -60px; background: var(--yellow); color: #000; padding: 8px 14px; z-index: 80; }
.skip:focus { top: 12px; }
.lbl { display: block; font: 700 12px/1.3 var(--disp); letter-spacing: .14em; text-transform: uppercase; color: var(--pencil); margin: 0 0 8px; }
.note { font-size: 14.5px; color: var(--pencil); margin: 8px 0 0; }
.msg { font-size: 14.5px; color: var(--pencil); }
.msg.err { color: var(--red); }
.btn { font: 700 15px/1 var(--disp); letter-spacing: .04em; cursor: pointer; display: inline-flex; align-items: center; gap: 8px; padding: 11px 16px; background: var(--ink); color: var(--vellum); border: 0; border-radius: 2px; box-shadow: 3px 3px 0 var(--line2); }
.btn:hover { background: var(--blue3); }
.btn.ghost { background: transparent; color: inherit; border: 1.5px solid currentColor; box-shadow: none; padding: 9.5px 14px; }
.btn.file { position: relative; overflow: hidden; }
.btn.file input { position: absolute; inset: 0; opacity: 0; cursor: pointer; }
.fld { display: block; margin: 0 0 14px; }
.fld input[type=text], .fld select { width: 100%; font: 400 16px/1.4 var(--mono); color: var(--ink); background: #fff; border: 1.5px solid var(--rule); border-bottom: 2px solid var(--ink); padding: 9px 11px; border-radius: 0; }
.fld select { font-family: var(--body); }
.chk { display: inline-flex; align-items: center; gap: 8px; font-size: 15.5px; margin-bottom: 12px; }
.chk input { accent-color: var(--ink); width: 17px; height: 17px; }

/* ---------------------------------------------------------------- 1. the sheet (blueprint) */
.sheet { background-color: var(--blue); background-image: linear-gradient(rgba(232,241,250,.07) 1px, transparent 1px), linear-gradient(90deg, rgba(232,241,250,.07) 1px, transparent 1px); background-size: 24px 24px; color: var(--line); padding: 30px 20px 38px; border-bottom: 6px double var(--line2); }
.sheet-in { max-width: 1220px; margin: 0 auto; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 440px); grid-template-areas: "left rev" "iso iso"; gap: 22px 40px; border: 2px solid var(--line2); padding: 28px; position: relative; }
.sheet-in::before { content: ""; position: absolute; inset: 6px; border: 1px solid rgba(157,190,221,.4); pointer-events: none; }
.sh-left { grid-area: left; }
.sh-k { font: 700 13px var(--disp); letter-spacing: .18em; text-transform: uppercase; color: var(--line2); }
.sheet h1 { font: 700 clamp(48px, 7.4vw, 96px)/1 var(--disp); letter-spacing: .02em; margin: 0; color: #fff; }
.sh-tick { font: 700 30px var(--disp); color: var(--yellow); letter-spacing: .08em; margin: 6px 0 16px; }
.sh-lede { font-size: 18.5px; color: #D7E6F4; max-width: 640px; margin: 0; }
.sh-lede b { color: #fff; }
.revtable { grid-area: rev; align-self: start; }
.revtable table { width: 100%; border-collapse: collapse; font: 500 15px var(--disp); }
.revtable caption { caption-side: top; text-align: left; font: 700 12px var(--disp); letter-spacing: .18em; text-transform: uppercase; color: var(--line2); padding-bottom: 6px; }
.revtable th, .revtable td { border: 1.5px solid var(--line2); padding: 6px 10px; text-align: left; }
.revtable th { font-size: 12px; letter-spacing: .12em; text-transform: uppercase; color: var(--line2); }
.revtable td:first-child, .revtable td:last-child { text-align: center; color: var(--yellow); font-weight: 700; width: 52px; }
.revtable a { color: #fff; text-decoration: none; display: block; }
.revtable a:hover, .revtable tr.on a { color: var(--yellow); }
.revtable tr.on td { background: rgba(247,208,70,.12); }
.iso { grid-area: iso; margin: 0; }
.iso svg { display: block; width: 100%; height: auto; }
.iso-cap { font: 500 14px var(--disp); letter-spacing: .06em; color: var(--line2); margin-top: 6px; }
.isf { stroke: var(--line); stroke-width: 1.4; }
.isf.top { fill: rgba(232,241,250,.12); } .isf.side { fill: rgba(232,241,250,.05); } .isf.front { fill: rgba(232,241,250,.2); }
.isd { stroke: var(--yellow); stroke-width: 1.4; fill: none; }
.ist { fill: var(--yellow); font: 700 17px var(--disp); }
.isv { fill: var(--line2); font: 700 15px var(--disp); letter-spacing: .12em; }
.isg { stroke: rgba(232,241,250,.45); stroke-width: .8; }

/* ---------------------------------------------------------------- sections */
.sec { padding: 64px 20px; background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px); background-size: 32px 32px; background-color: var(--vellum); }
.sec.vellum2 { background-color: var(--vellum2); }
.sec > * { max-width: 1180px; margin-left: auto; margin-right: auto; }
.sec-head { display: flex; align-items: center; gap: 16px; border-bottom: 2px solid var(--ink); padding-bottom: 10px; margin-bottom: 18px; }
.zone { width: 46px; height: 46px; border: 2px solid var(--ink); border-radius: 50%; display: grid; place-items: center; font: 700 22px var(--disp); flex: none; background: var(--vellum); }
.sec-head h2 { font: 700 clamp(28px, 3.8vw, 42px)/1.05 var(--disp); margin: 0; flex: 1; letter-spacing: .01em; }
.rev { font: 700 13px var(--disp); letter-spacing: .1em; text-transform: uppercase; color: var(--pencil); }
.intro { font-size: 18px; max-width: 820px; margin-left: max(0px, calc((100% - 1180px) / 2)); margin-bottom: 24px; color: #2C3E5C; }

/* 2. the bench */
.presets { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.presets button, .chips button, .opbtns button { font: 500 14.5px/1.2 var(--disp); border: 1.5px solid var(--ink); background: #fff; color: var(--ink); padding: 7px 12px; cursor: pointer; border-radius: 0; }
.presets button[aria-pressed=true], .opbtns button[aria-pressed=true] { background: var(--ink); color: var(--vellum); }
.bn-grid { display: grid; grid-template-columns: minmax(0, 420px) minmax(0, 1fr); gap: 34px; align-items: start; }
.row3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
.callouts { list-style: none; margin: 0; padding: 0; counter-reset: co; }
.callouts li { counter-increment: co; position: relative; padding: 9px 0 9px 50px; border-bottom: 1px dashed var(--rule); font-size: 16.5px; }
.callouts li::before { content: counter(co); position: absolute; left: 0; top: 7px; width: 32px; height: 32px; border: 1.8px solid var(--ink); border-radius: 50%; display: grid; place-items: center; font: 700 15px var(--disp); background: #fff; }
.callouts li.k-result { font-weight: 600; border-bottom: 0; }
.callouts li.k-result::before { background: var(--yellow); }
.callouts li.k-reduce::before { border-color: var(--red); color: var(--red); }
.callouts.small li { font-size: 15px; padding-top: 6px; padding-bottom: 6px; padding-left: 44px; }
.callouts.small li::before { width: 28px; height: 28px; top: 4px; font-size: 13px; }
.code-line { font: 400 14px/1.5 var(--mono); background: var(--ink); color: #E8F1FA; padding: 10px 14px; margin-top: 14px; white-space: pre-wrap; overflow-wrap: anywhere; }
.flow { margin-top: 30px; margin-bottom: 0; background: #fff; border: 1.5px solid var(--ink); padding: 10px; }
.flow svg { display: block; width: 100%; height: auto; }
.fig-cap { font: 500 14px var(--disp); color: var(--pencil); margin-top: 6px; }
.fl-bar { fill: #fff; stroke: var(--ink); stroke-width: 1.5; }
.fl-part { stroke: var(--ink); stroke-width: 1.5; }
.fl-red { fill: rgba(211,63,46,.15); stroke: var(--red); stroke-dasharray: 5 4; }
.fl-new { fill: rgba(247,208,70,.35); }
.fl-txt { fill: var(--ink); font: 700 14px var(--disp); }
.fl-sub { fill: var(--pencil); font: 500 12px var(--disp); }
.fl-link { fill: none; stroke: var(--blue3); stroke-width: 1.4; opacity: .7; }
.fl-k { fill: var(--pencil); font: 700 12px var(--disp); letter-spacing: .14em; }
.tracer { margin-top: 30px; }
.tr-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 30px; }
.tr-k { font: 700 14px var(--disp); margin-bottom: 8px; }
.cells { display: flex; flex-wrap: wrap; gap: 3px; align-content: flex-start; max-height: 260px; overflow: auto; padding: 8px; background: #fff; border: 1.5px solid var(--rule); }
.cells span, .cells button { width: 34px; height: 26px; display: grid; place-items: center; font: 500 12px var(--mono); border: 1px solid var(--rule); background: var(--vellum); color: var(--ink); padding: 0; }
.cells button { cursor: pointer; }
.cells .on { background: var(--yellow); border-color: var(--ink); font-weight: 700; }
.cells .br { width: 100%; height: 4px; border: 0; background: transparent; }

/* 3. your image */
.im-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 360px); gap: 34px; align-items: start; }
.im-ctrl { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-bottom: 16px; }
.frame { position: relative; display: inline-block; padding: 0 0 32px 44px; max-width: 100%; }
.frame canvas { display: block; border: 1.5px solid var(--ink); cursor: crosshair; image-rendering: pixelated; max-width: 100%; height: auto; }
.dim { position: absolute; font: 700 14px var(--disp); color: var(--red); }
.dim-w { left: 44px; right: 0; bottom: 0; text-align: center; border-top: 1.5px solid var(--red); padding-top: 4px; }
.dim-w::before, .dim-w::after { content: ""; position: absolute; top: -6px; width: 1.5px; height: 10px; background: var(--red); }
.dim-w::before { left: 0; } .dim-w::after { right: 0; }
.dim-h { left: 0; top: 0; bottom: 32px; width: 30px; border-right: 1.5px solid var(--red); writing-mode: vertical-rl; transform: rotate(180deg); text-align: center; }
.tensor-line { font: 500 15px var(--mono); margin-top: 12px; }
.loupe { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 3px; background: #fff; border: 1.5px solid var(--ink); padding: 6px; }
.loupe div { aspect-ratio: 1; display: grid; place-content: center; font: 500 10.5px/1.2 var(--mono); text-align: center; border: 1px solid rgba(0,0,0,.08); }
.loupe div.mid { outline: 2.5px solid var(--red); outline-offset: -2px; }
.ops { margin-top: 30px; }
.opbtns { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.op-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 30px; align-items: start; }
.op-out canvas { display: block; border: 1.5px solid var(--ink); max-width: 100%; height: auto; image-rendering: pixelated; background: #fff; }

/* 4. detail T */
.sec.blue { background-color: var(--blue); background-image: linear-gradient(rgba(232,241,250,.07) 1px, transparent 1px), linear-gradient(90deg, rgba(232,241,250,.07) 1px, transparent 1px); background-size: 24px 24px; color: var(--line); }
.blue .sec-head { border-color: var(--line2); }
.blue .zone { border-color: var(--line); background: var(--blue); color: var(--yellow); }
.blue .rev { color: var(--line2); }
.blue .lbl { color: var(--line2); }
.tk-grid { display: grid; grid-template-columns: minmax(0, 360px) minmax(0, 1fr); grid-template-areas: "det mea" "vp vp"; gap: 30px; }
.detail { grid-area: det; position: relative; border: 2px solid var(--line); border-radius: 50% 50% 8px 8px / 120px 120px 8px 8px; padding: 70px 24px 24px; }
.balloon { position: absolute; left: 50%; top: -26px; transform: translateX(-50%); width: 56px; height: 56px; border-radius: 50%; border: 2px solid var(--line); background: var(--blue); display: grid; place-items: center; font: 700 26px var(--disp); color: var(--yellow); }
.dt-k { font: 700 12px var(--disp); letter-spacing: .18em; text-transform: uppercase; color: var(--line2); text-align: center; }
.dt-name { font: 700 30px var(--disp); text-align: center; color: #fff; }
.detail code { display: block; font-size: 13.5px; background: rgba(0,0,0,.2); border: 1px dashed var(--line2); padding: 10px; word-break: break-all; margin-bottom: 12px; color: #fff; }
.detail .btn { background: var(--yellow); color: var(--ink); box-shadow: 3px 3px 0 rgba(0,0,0,.25); }
.detail .msg { display: block; margin-top: 8px; color: var(--yellow); }
.refdes { list-style: none; margin: 18px 0 0; padding: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.refdes a { display: flex; align-items: center; gap: 8px; color: #fff; text-decoration: none; border: 1.5px solid var(--line2); padding: 7px 10px; font: 700 14px var(--disp); }
.refdes a:hover { border-color: var(--yellow); color: var(--yellow); }
.refdes img { width: 22px; height: 22px; object-fit: contain; background: #fff; border-radius: 3px; }
.refdes li[hidden] { display: none; }
.measures { grid-area: mea; }
.dims { margin: 0; display: grid; gap: 4px; }
.dims div { display: grid; grid-template-columns: 150px minmax(0, 1fr); align-items: center; gap: 14px; }
.dims dt { font: 700 13px var(--disp); letter-spacing: .12em; text-transform: uppercase; color: var(--line2); }
.dims dd { margin: 0; position: relative; padding: 14px 0 6px; text-align: center; font: 700 26px var(--disp); color: #fff; }
.dims dd::before { content: ""; position: absolute; left: 0; right: 0; top: 8px; border-top: 1.5px solid var(--yellow); }
.dims dd::after { content: ""; position: absolute; left: 0; right: 0; top: 3px; height: 10px; border-left: 1.5px solid var(--yellow); border-right: 1.5px solid var(--yellow); }
.dims dd.up { color: #8BE3B0; } .dims dd.down { color: #FF9C8F; }
.dims dd sub { font-size: .6em; }
.note.light { color: var(--line2); }
.specs { display: flex; flex-wrap: wrap; gap: 0; margin: 18px 0 0; border: 1.5px solid var(--line2); width: fit-content; }
.specs div { padding: 8px 16px; border-right: 1.5px solid var(--line2); }
.specs div:last-child { border-right: 0; }
.specs dt { font: 700 11px var(--disp); letter-spacing: .14em; text-transform: uppercase; color: var(--line2); }
.specs dd { margin: 0; font: 700 20px var(--disp); color: #fff; }
.viewport { grid-area: vp; position: relative; padding: 18px; }
.crop { position: absolute; width: 28px; height: 28px; border-color: var(--yellow); border-style: solid; }
.crop.tl { left: 0; top: 0; border-width: 2px 0 0 2px; } .crop.tr { right: 0; top: 0; border-width: 2px 2px 0 0; } .crop.bl { left: 0; bottom: 34px; border-width: 0 0 2px 2px; } .crop.br { right: 0; bottom: 34px; border-width: 0 2px 2px 0; }
.vp-frame { position: relative; height: 520px; background: #fff; border: 1.5px solid var(--line); }
.vp-frame iframe { width: 100%; height: 100%; border: 0; display: block; }
.vp-wait { position: absolute; inset: 0; display: grid; place-items: center; background: var(--vellum); color: var(--pencil); font: 500 15px var(--disp); text-align: center; padding: 20px; transition: opacity .4s; }
.vp-wait.off { opacity: 0; pointer-events: none; }
.vp-cap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; font: 500 14px var(--disp); color: var(--line2); margin: 10px 0 0; }
.vp-cap a { color: var(--yellow); display: inline-flex; align-items: center; gap: 6px; }
.vp-cap svg { width: 15px; height: 15px; }

/* 5. guess */
.gs-grid { display: grid; grid-template-columns: minmax(0, 380px) minmax(0, 1fr); gap: 34px; align-items: start; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.gs-out { background: #fff; border: 1.5px solid var(--ink); padding: 22px; }
.gs-axes { display: flex; flex-wrap: wrap; gap: 0; margin-bottom: 16px; }
.gs-axes div { min-width: 86px; text-align: center; border: 1.5px solid var(--ink); margin-left: -1.5px; padding: 8px 10px; }
.gs-axes b { display: block; font: 700 34px var(--disp); }
.gs-axes small { display: block; font: 500 13px var(--mono); color: var(--pencil); }
.gs-axes .ch { background: var(--yellow); }
.gs-verdict { font: 700 22px var(--disp); margin-bottom: 6px; }
.gs-verdict .hedge { color: var(--red); font-size: 16px; margin-left: 8px; }
.gs-why { margin: 0; color: #2C3E5C; }
.gs-eval { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 34px; margin-top: 30px; align-items: start; }
.dt { border-collapse: collapse; width: 100%; background: #fff; }
.dt th, .dt td { border: 1.5px solid var(--ink); padding: 8px 12px; text-align: left; font-size: 15.5px; }
.dt th { font: 700 12px var(--disp); letter-spacing: .12em; text-transform: uppercase; background: var(--vellum2); }
.misses { list-style: none; margin: 0; padding: 0; }
.misses li { padding: 8px 0; border-bottom: 1px dashed var(--rule); font-size: 15px; }
.misses code { font-weight: 600; }

/* 6. the technical note */
.tn { background: #fff; border: 2px solid var(--ink); max-width: 940px; }
.tn-head { border-bottom: 2px solid var(--ink); padding: 22px 30px 18px; }
.tn-id { display: flex; gap: 0; margin-bottom: 14px; }
.tn-id span { font: 700 13px var(--disp); letter-spacing: .1em; border: 1.5px solid var(--ink); padding: 4px 12px; margin-left: -1.5px; }
.tn-id span:first-child { margin-left: 0; background: var(--ink); color: #fff; }
.tn-head h3 { font: 700 clamp(23px, 2.8vw, 30px)/1.25 var(--serif); }
.tn-by { font: italic 400 15.5px var(--serif); color: var(--pencil); margin: 0; }
.tn-body { padding: 24px 30px 30px; font-family: var(--serif); font-size: 17px; line-height: 1.7; column-count: 2; column-gap: 40px; column-rule: 1px solid var(--rule); }
.tn-body h4 { font: 700 15px var(--disp); letter-spacing: .1em; text-transform: uppercase; margin: 18px 0 6px; display: flex; align-items: center; gap: 10px; break-after: avoid; }
.tn-body h4:first-child { margin-top: 0; }
.tn-body h4 span { width: 26px; height: 26px; border: 1.5px solid var(--ink); border-radius: 50%; display: grid; place-items: center; font-size: 13px; letter-spacing: 0; }
.tn-body code { font-size: 14px; background: var(--vellum2); padding: 1px 4px; }
.nc { background: #FFF6D6; border-left: 4px solid var(--yellow); padding: 10px 14px; font-size: 15.5px; break-inside: avoid; }
.tw { overflow-x: auto; }
.tt { border-collapse: collapse; width: 100%; font: 400 14.5px var(--body); margin: 6px 0 12px; break-inside: avoid; }
.tt caption { caption-side: top; text-align: left; font: italic 400 15px var(--serif); color: var(--pencil); padding-bottom: 6px; }
.tt th, .tt td { border-top: 1.5px solid var(--ink); border-bottom: 1px solid var(--rule); padding: 5px 8px; text-align: left; }
.refl { margin: 0; padding-left: 20px; font-size: 15px; }

/* 7. parts list */
.pt-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: 34px; align-items: start; }
.bom { border-collapse: collapse; width: 100%; background: #fff; }
.bom th, .bom td { border: 1.5px solid var(--ink); padding: 7px 10px; font-size: 14.5px; text-align: left; }
.bom th { font: 700 12px var(--disp); letter-spacing: .12em; text-transform: uppercase; background: var(--vellum2); }
.bom td:first-child { text-align: center; font: 700 15px var(--disp); width: 54px; }
.bom button { font: 600 14.5px var(--mono); color: var(--blue3); background: none; border: 0; padding: 0; cursor: pointer; text-align: left; text-decoration: underline; text-underline-offset: 3px; overflow-wrap: anywhere; }
.bom td:last-child { font: 400 12px var(--mono); color: var(--pencil); }
.viewer { margin-top: 20px; background: #fff; border: 1.5px solid var(--ink); }
.viewer-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px; padding: 8px 12px; background: var(--vellum2); border-bottom: 1.5px solid var(--ink); }
.viewer-bar b { font: 600 15px var(--mono); }
.viewer-bar span { flex: 1; font: 12px var(--mono); color: var(--pencil); overflow-wrap: anywhere; }
.viewer-body { max-height: 540px; overflow: auto; }
.lines { margin: 0; padding: 12px 0; font: 13px/1.55 var(--mono); counter-reset: ln; }
.lines span { display: block; padding: 0 14px 0 64px; position: relative; white-space: pre; }
.lines span::before { counter-increment: ln; content: counter(ln); position: absolute; left: 0; width: 48px; text-align: right; color: #9AA6B4; }
.md { padding: 16px 22px; font-size: 16px; }
.md h1 { font: 700 30px var(--disp); } .md h2 { font: 700 22px var(--disp); margin-top: 20px; } .md h3 { font-size: 18px; }
.md table { border-collapse: collapse; margin: 10px 0 16px; } .md th, .md td { border: 1px solid var(--rule); padding: 6px 10px; font-size: 14.5px; text-align: left; }
.md pre { background: var(--ink); color: #E8F1FA; padding: 12px 14px; overflow-x: auto; font-size: 13px; }
.dls { display: grid; gap: 8px; margin-bottom: 22px; }
.dls a { display: grid; grid-template-columns: 22px minmax(0, 1fr); gap: 2px 10px; background: #fff; border: 1.5px solid var(--ink); padding: 10px 12px; text-decoration: none; color: var(--ink); }
.dls a:hover { background: #FFF6D6; }
.dls svg { width: 20px; height: 20px; grid-row: span 2; }
.dls b { font-family: var(--disp); }
.dls small { font: 12px/1.4 var(--mono); color: var(--pencil); overflow-wrap: anywhere; }
.code { background: var(--ink); color: #E8F1FA; padding: 12px 14px; font-size: 13.5px; line-height: 1.55; white-space: pre-wrap; overflow-wrap: anywhere; margin: 0 0 18px; }
.api td:first-child { width: 50%; }
.api code { font-size: 13.5px; color: var(--blue3); font-weight: 600; }

/* 8. the title block */
.tb { background: var(--vellum); padding: 30px 20px 40px; border-top: 6px double var(--ink); }
.tb-grid { max-width: 1180px; margin: 0 auto; display: grid; grid-template-columns: 2fr 1.2fr .8fr; border: 2.5px solid var(--ink); }
.tb-cell { border: 1.5px solid var(--ink); padding: 10px 14px; font: 500 16px var(--disp); }
.tb-l { display: block; font: 700 11px var(--disp); letter-spacing: .16em; text-transform: uppercase; color: var(--pencil); margin-bottom: 2px; }
.tb-title b { font: 700 28px/1.15 var(--disp); }
.tb-links { grid-column: span 2; }
.tb-links ul { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 6px 22px; }
.tb-links a { color: var(--ink); font-weight: 700; }
.tb-links li[hidden] { display: none; }
.tb-note { grid-column: 1 / -1; font: 400 13.5px/1.5 var(--body); color: var(--pencil); }

/* ---------------------------------------------------------------- small screens */
@media (max-width: 980px) {
  .flow, .iso { overflow-x: auto; }
  .flow svg { min-width: 720px; }
  .iso svg { min-width: 600px; }
  .sheet-in { grid-template-columns: minmax(0, 1fr); grid-template-areas: "left" "rev" "iso"; }
  .bn-grid, .im-grid, .op-grid, .gs-grid, .gs-eval, .pt-grid, .tr-grid { grid-template-columns: minmax(0, 1fr); }
  .tk-grid { grid-template-columns: minmax(0, 1fr); grid-template-areas: "det" "mea" "vp"; }
  .tn-body { column-count: 1; }
}
@media (max-width: 620px) {
  body { font-size: 16px; }
  .sheet { padding: 16px 12px 24px; }
  .sheet-in { padding: 18px 14px; }
  .sec { padding: 46px 16px; }
  .row3 { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .dims div { grid-template-columns: 110px minmax(0, 1fr); }
  .vp-frame { height: 420px; }
  .tn-head, .tn-body { padding-left: 18px; padding-right: 18px; }
  .tb-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); grid-auto-flow: dense; }
  .tb-title, .tb-links { grid-column: 1 / -1; }
  .refdes { grid-template-columns: minmax(0, 1fr); }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .vp-wait { transition: none; }
}