/* Before you start + quickstart: three photocopied pages of a 1960s–70s kit assembly manual
   (Heathkit). Helvetica-ish heads, a Times-ish body, typewriter commands, black toner; the reader's
   marks are blue ballpoint. From brand/mockups/kit-manual.html. Everything is scoped to .doc-kit. */
.doc-kit { --paper: #eeede6; --toner: #151515; --pen: #22348f; --desk: #cfcdc2;
    --head: 800 15px/1.1 "Archivo", sans-serif; }
  .doc-kit { background: var(--desk) radial-gradient(120% 90% at 30% 15%, #d9d7cc, #bdbbaf); color: var(--toner); font: 400 16px/1.42 "Tinos", "Times New Roman", serif; padding: 56px 16px 100px; }
  .doc-kit a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 2px; }

  /* Two loose pages on the desk */
  .doc-kit .stack { max-width: 880px; margin: 0 auto; display: grid; gap: 48px; }
  .doc-kit .sheet { position: relative; filter: drop-shadow(0 1px 0 rgb(0 0 0 / .08)) drop-shadow(6px 10px 14px rgb(0 0 0 / .22)); }
  /* Each page lands a little differently on every visit: see "Lay the pages down" in the script */
  .doc-kit .sheet { transform: translateX(var(--dx, 0)) rotate(var(--tilt, 0deg)); }
  .doc-kit .paper { position: absolute; inset: 0; background: linear-gradient(90deg, rgb(255 255 255 / .25), rgb(255 255 255 / 0) 35%, rgb(80 70 45 / .07)), var(--paper); }
  .doc-kit .paper svg { position: absolute; inset: 0; width: 100%; height: 100%; mix-blend-mode: multiply; }
  /* the photocopier's grey edge where the page didn't sit flat on the glass */
  .doc-kit .paper::after { content: ""; position: absolute; inset: 0; box-shadow: inset 0 0 0 1px rgb(0 0 0 / .06), inset 14px 0 18px -14px rgb(0 0 0 / .25); }

  .doc-kit .print { position: relative; padding: 34px clamp(20px, 5vw, 56px) 30px; filter: url(#ink-kit); }
  @media (prefers-contrast: more) { .print { filter: none; } }

  /* Running head: manufacturer, model, page */
  .doc-kit .runhead { display: flex; justify-content: space-between; align-items: end; gap: 12px; font: 700 12px/1 "Archivo"; font-stretch: 85%; letter-spacing: .06em; text-transform: uppercase; padding-bottom: 7px; border-bottom: 3px solid var(--toner); }
  .doc-kit .runhead img { height: 20px; display: block; filter: grayscale(1) contrast(2); }
  .doc-kit .runhead .pg { font: 900 22px/1 "Archivo"; font-stretch: 75%; letter-spacing: 0; }
  .doc-kit .rule2 { height: 1px; background: var(--toner); margin-top: 3px; }

  .doc-kit h2 { font: 900 clamp(34px, 6vw, 58px)/.95 "Archivo"; font-stretch: 70%; text-transform: uppercase; letter-spacing: -.005em; margin: 22px 0 4px; }
  .doc-kit h2 small { display: block; font: 700 15px/1.2 "Archivo"; font-stretch: 100%; letter-spacing: .04em; margin-top: 8px; }
  .doc-kit h3 { font: 900 22px/1 "Archivo"; font-stretch: 80%; text-transform: uppercase; letter-spacing: .02em; margin: 30px 0 10px; padding: 6px 0 5px; border-top: 2px solid var(--toner); border-bottom: 1px solid var(--toner); }
  .doc-kit h4 { font: var(--head); font-stretch: 90%; text-transform: uppercase; letter-spacing: .03em; margin: 18px 0 4px; }
  .doc-kit h4 em { font: italic 400 14px/1 "Tinos"; text-transform: none; letter-spacing: 0; }
  .doc-kit p { margin: 0 0 10px; }
  .doc-kit .intro { columns: 2 280px; column-gap: 34px; }
  .doc-kit .intro p { break-inside: avoid; }

  /* Two-column body, like the manual */
  .doc-kit .cols { display: grid; grid-template-columns: 1fr 1fr; gap: 0 38px; }

  /* "( )" steps. The tick is blue ballpoint, a little different each time. */
  .doc-kit .item { display: grid; grid-template-columns: 30px 1fr; align-items: start; padding: 3px 0; cursor: var(--cursor-pen); }
  .doc-kit .item a { cursor: pointer; }
  .doc-kit .blank input { cursor: var(--cursor-pen); }
  .doc-kit .item input { position: absolute; opacity: 0; pointer-events: none; }
  .doc-kit .box { position: relative; font: 700 16px/1.42 "Courier Prime", monospace; letter-spacing: -.08em; user-select: none; }
  /* Pen marks sit above the photocopy, outside its ink filter, so the blue stays crisp */
  .doc-kit .pen { position: absolute; inset: 0; z-index: 2; pointer-events: none; }
  .doc-kit .tick { position: absolute; width: 26px; height: 28px; overflow: visible; }
  .doc-kit .tick path { fill: none; stroke: var(--pen); stroke-width: 2.4; stroke-linecap: round; stroke-linejoin: round; stroke-dasharray: 60; stroke-dashoffset: 60; transition: stroke-dashoffset .22s ease-out; }
  .doc-kit .tick.on path { stroke-dashoffset: 0; }
  .doc-kit .item input:focus-visible + .box { outline: 2px solid var(--pen); outline-offset: 1px; }
  @media (prefers-reduced-motion: reduce) { .tick path { transition: none; } }
  .doc-kit .item .t small { display: block; font-size: 14px; line-height: 1.35; }
  .doc-kit .sub { margin-left: 30px; }

  .doc-kit code, .doc-kit .cmd pre { font-family: "Courier Prime", monospace; }
  .doc-kit code { font-size: .95em; }

  /* Parts list as a table */
  .doc-kit table { width: 100%; border-collapse: collapse; font-size: 15px; margin: 4px 0 0; }
  .doc-kit th { font: 700 11.5px/1 "Archivo"; font-stretch: 85%; letter-spacing: .06em; text-transform: uppercase; text-align: left; border-bottom: 1.5px solid var(--toner); padding: 4px 6px 5px 0; }
  .doc-kit td { padding: 5px 6px 5px 0; border-bottom: 1px solid rgb(21 21 21 / .5); vertical-align: top; }
  .doc-kit td.c { width: 30px; }
  .doc-kit td.c .item { padding: 0; }
  .doc-kit td.k { width: 38px; font-family: "Courier Prime"; }

  /* NOTE / CAUTION boxes */
  .doc-kit .box-note { border: 1.5px solid var(--toner); padding: 8px 12px 9px; margin: 12px 0; font-size: 15px; }
  .doc-kit .box-note b { font: 900 13px/1 "Archivo"; font-stretch: 85%; letter-spacing: .06em; text-transform: uppercase; margin-right: 6px; }
  .doc-kit .box-note.caution { border-width: 3px; }

  /* Commands: typed in a ruled box, with a printed "copy" tab */
  .doc-kit .cmd { display: flex; gap: 10px; align-items: flex-start; border: 1.5px solid var(--toner); padding: 8px 10px; margin: 6px 0 8px; background: rgb(255 255 255 / .25); }
  .doc-kit .cmd pre { margin: 0; flex: 1; font-size: 15px; line-height: 1.45; white-space: pre-wrap; word-break: break-all; }
  .doc-kit .cmd button { all: unset; cursor: pointer; flex: none; font: 700 11px/1 "Archivo"; font-stretch: 85%; letter-spacing: .08em; text-transform: uppercase; border: 1.5px solid var(--toner); padding: 5px 7px 4px; }
  .doc-kit .cmd button:hover { background: var(--toner); color: var(--paper); }
  .doc-kit .cmd button:focus-visible { outline: 2px solid var(--pen); outline-offset: 2px; }
  .doc-kit .cmd .ip { font-family: "Kalam", cursive; color: var(--pen); font-size: 1.12em; }

  /* The fill-in blank for the address, written in pen */
  .doc-kit .blank { display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 10px; margin: 6px 0 4px 30px; }
  .doc-kit .blank input { font: 400 22px/1 "Kalam", cursive; color: var(--pen); background: transparent; border: 0; border-bottom: 1.5px solid var(--toner); width: 9.5em; padding: 2px 4px 0; }
  .doc-kit .blank input:focus { outline: none; border-bottom-width: 2.5px; }
  .doc-kit .blank input::placeholder { color: transparent; }

  /* Pictorials: line drawings with lettered callouts */
  .doc-kit figure { margin: 14px 0 10px; border: 1.5px solid var(--toner); padding: 10px 12px 8px; }
  .doc-kit figure svg { width: 100%; height: auto; display: block; }
  .doc-kit figcaption { font: 900 14px/1 "Archivo"; font-stretch: 80%; letter-spacing: .08em; text-transform: uppercase; text-align: center; margin-top: 6px; }
  .doc-kit .tools { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; text-align: center; font: 700 11.5px/1.2 "Archivo"; font-stretch: 85%; letter-spacing: .04em; text-transform: uppercase; }
  .doc-kit .tools svg { width: 100%; height: 64px; }

  .doc-kit .stepno { display: flex; align-items: baseline; gap: 10px; }
  .doc-kit .stepno b { font: 900 46px/.9 "Archivo"; font-stretch: 70%; }
  .doc-kit .proceed { text-align: center; font: 700 15px/1.3 "Archivo"; font-stretch: 90%; text-transform: uppercase; letter-spacing: .04em; margin: 22px 0 0; padding: 10px; border-top: 3px solid var(--toner); border-bottom: 1px solid var(--toner); }
  .doc-kit .tally { font: 700 12px/1 "Archivo"; font-stretch: 85%; letter-spacing: .06em; text-transform: uppercase; display: flex; justify-content: space-between; margin-top: 16px; }
  .doc-kit .tally button { all: unset; cursor: pointer; text-decoration: underline; }
  .doc-kit .foot { display: flex; justify-content: space-between; margin-top: 18px; font: 700 11px/1 "Archivo"; font-stretch: 85%; letter-spacing: .06em; text-transform: uppercase; }



  /* Tighter setting so each page's content fits its Letter sheet */
  .doc-kit { font-size: 15px; line-height: 1.36; }
  .doc-kit .print { padding-top: 28px; padding-bottom: 20px; }
  .doc-kit h2 { font-size: 50px; margin: 16px 0 2px; }
  .doc-kit h2 small { margin-top: 6px; }
  .doc-kit h3 { margin: 20px 0 8px; }
  .doc-kit h4 { margin: 12px 0 3px; }
  .doc-kit p { margin-bottom: 8px; }
  .doc-kit .item { padding: 2px 0; }
  .doc-kit .item .t small { font-size: 13px; }
  .doc-kit figure { margin: 10px 0 8px; padding: 8px 12px 6px; }
  .doc-kit .tools svg { height: 46px; }
  .doc-kit .cmd { margin: 4px 0 6px; padding: 6px 10px; }
  .doc-kit .cmd pre { font-size: 14px; }
  .doc-kit .box-note { margin: 8px 0; padding: 6px 12px 7px; font-size: 14px; }
  .doc-kit .stepno b { font-size: 40px; }
  /* time for each step, set flush right in the heading rule like a printed time chart */
  .doc-kit .stepno h3 { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
  .doc-kit .stepno h3 .time { font: 700 12.5px/1 "Archivo"; font-stretch: 85%; letter-spacing: .06em; }

  /* Every page is US Letter (8.5 x 11 in), as a printed manual's would be */
  .doc-kit .sheet { aspect-ratio: 8.5 / 11; }
  .doc-kit .sheet .print { height: 100%; display: flex; flex-direction: column; }
  .doc-kit .sheet .print > .foot { margin-top: auto; padding-top: 6px; }
  .doc-kit h2.cont { font-size: 34px; margin-top: 16px; }
  .doc-kit .notes { flex: 1; min-height: 0; margin: 14px 0 4px; border: 1.5px solid var(--toner); padding: 6px 10px; font: 900 13px/1 "Archivo"; font-stretch: 85%; letter-spacing: .08em; text-transform: uppercase;
    background: repeating-linear-gradient(to bottom, transparent 0 27px, rgb(21 21 21 / .55) 27px 28px) 0 22px / 100% calc(100% - 30px) no-repeat; }

  @media (max-width: 720px) {
    .doc-kit .cols { grid-template-columns: 1fr; }
    .doc-kit .tools { grid-template-columns: repeat(2, 1fr); }
  }