/* =============================================================================
   styles.css — plain by design. Engineering-drawing look: thin lines, no
   shadows, no gradients. Three colours carry meaning and nothing else does:
     blue  = interactive / the number you order
     green = this is the measurement being used
     red   = warning
   System fonts only, so the page works with no network at all.
   ============================================================================= */

:root {
  --ink:      #1a1d21;
  --ink-soft: #5b626a;
  --line:     #d3d7dc;
  --bg:       #ffffff;
  --panel:    #f7f8f9;
  --blue:     #1d6fa5;
  --green:    #157347;
  --green-bg: #e7f4ec;
  --red:      #b3261e;
  --red-bg:   #fdecea;
  --amber:    #8a5a00;
  --amber-bg: #fdf3e2;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

h1, h2 { font-weight: 600; letter-spacing: -0.01em; }

/* ---------- banner ---------- */
.rsmg-banner {
  background: var(--red-bg);
  border-bottom: 2px solid var(--red);
  color: var(--red);
  padding: 10px 16px;
  font-size: 14px;
  line-height: 1.45;
}
.rsmg-banner[hidden] { display: none; }

/* ---------- head ---------- */
.rsmg-page-head {
  padding: 18px 16px 12px;
  border-bottom: 1px solid var(--line);
}
.rsmg-page-head h1 { margin: 0; font-size: 21px; }
.rsmg-page-head .rsmg-sub { margin: 3px 0 0; color: var(--ink-soft); font-size: 14px; }

.rsmg-intro {
  max-width: 1240px;
  margin: 0 auto;
  padding: 14px 16px 0;
  font-size: 15px;
  color: var(--ink-soft);
}
@media (min-width: 900px) {
  .rsmg-intro { padding: 18px 24px 0; max-width: 1240px; }
}

/* Read-this-first block. Deliberately unmissable without shouting: heavy left
   rule, tinted panel, sits above the tool rather than beside it. */
.rsmg-disclaimer {
  max-width: 1240px;
  margin: 14px auto 0;
  padding: 14px 16px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 4px solid var(--ink);
  font-size: 14px;
  line-height: 1.5;
}
.rsmg-disclaimer h2 { margin: 0 0 8px; font-size: 15px; }
.rsmg-disclaimer p { margin: 0 0 8px; color: var(--ink-soft); }
.rsmg-disclaimer p:last-child { margin-bottom: 0; }
.rsmg-disclaimer strong { color: var(--ink); }

@media (min-width: 900px) {
  .rsmg-disclaimer { margin: 16px auto 0; padding: 16px 20px; }
}

/* ---------- layout: mobile first ---------- */
.rsmg-layout { display: block; }

.rsmg-stage {
  position: sticky;
  top: 0;
  z-index: 5;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
  padding: 6px 8px 2px;
}
#svgRoot { display: block; width: 100%; height: 38vh; max-height: 340px; }
.rsmg-stage-caption {
  margin: 0 0 4px;
  text-align: center;
  font-size: 11px;
  color: var(--ink-soft);
}

.rsmg-controls { padding: 16px; max-width: 640px; margin: 0 auto; }

@media (min-width: 900px) {
  .rsmg-layout {
    display: grid;
    grid-template-columns: minmax(360px, 1fr) minmax(420px, 560px);
    gap: 32px;
    align-items: start;
    padding: 0 24px;
    max-width: 1240px;
    margin: 0 auto;
  }
  .rsmg-stage {
    position: sticky;
    top: 16px;
    border-bottom: 0;
    padding-top: 24px;
  }
  #svgRoot { height: auto; max-height: none; }
  .rsmg-controls { padding: 24px 0 48px; }
}

/* ---------- SVG text ---------- */
.rsmg-svg-note     { font-size: 10px; fill: #8a8f96; }
.rsmg-svg-boxlabel { font-size: 10px; fill: #2b3138; }
.rsmg-svg-dim      { font-size: 12px; font-weight: 600; }
.rsmg-svg-dim.rsmg-grey { fill: #6f767e; }
.rsmg-svg-dim.rsmg-blue { fill: var(--blue); }
.rsmg-svg-callout  { font-size: 11px; font-weight: 600; fill: var(--green); }
.rsmg-svg-callout.rsmg-warn { fill: var(--red); }
.rsmg-hidden { display: none; }

/* animate the shutter moving between wall-mounted and in-reveal */
#headBox, #guideL, #guideR, #curtain, #architrave, #opening {
  transition: x 250ms ease, y 250ms ease, width 250ms ease, height 250ms ease;
}
#headBox.rsmg-over-size { fill: var(--red-bg); stroke: var(--red); }

/* ---------- controls ---------- */
.rsmg-tools {
  margin: 0 0 18px;
  padding: 10px 12px;
  background: var(--panel);
  border: 1px solid var(--line);
  font-size: 14px;
}

.rsmg-step {
  border: 1px solid var(--line);
  padding: 12px 14px 14px;
  margin: 0 0 16px;
}
.rsmg-step legend {
  font-weight: 600;
  font-size: 15px;
  padding: 0 6px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.rsmg-step legend .rsmg-n {
  display: inline-grid;
  place-items: center;
  width: 22px; height: 22px;
  background: var(--ink);
  color: #fff;
  border-radius: 50%;
  font-size: 12px;
}
.rsmg-hint { margin: 4px 0 12px; font-size: 14px; color: var(--ink-soft); }

/* segmented control */
.rsmg-seg { display: flex; gap: 8px; }
.rsmg-seg label { flex: 1; }
.rsmg-seg input { position: absolute; opacity: 0; pointer-events: none; }
.rsmg-seg span {
  display: block;
  text-align: center;
  padding: 13px 8px;
  min-height: 48px;
  border: 1px solid var(--line);
  background: #fff;
  font-size: 15px;
  cursor: pointer;
}
.rsmg-seg span small {
  display: block;
  font-size: 12px;
  font-weight: 400;
  line-height: 1.3;
  margin-top: 2px;
  color: var(--ink-soft);
}
.rsmg-seg input:checked + span {
  border-color: var(--blue);
  background: var(--blue);
  color: #fff;
  font-weight: 600;
}
.rsmg-seg input:checked + span small { color: rgba(255, 255, 255, .8); }
.rsmg-seg input:focus-visible + span { outline: 2px solid var(--blue); outline-offset: 2px; }

/* profile select */
.rsmg-select {
  width: 100%;
  min-height: 48px;
  padding: 11px 12px;
  font-size: 16px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  border-radius: 0;
}
.rsmg-select:focus { outline: 2px solid var(--blue); outline-offset: -1px; }
.rsmg-step .rsmg-msg { margin-top: 10px; }
.rsmg-step .rsmg-msg[hidden] { display: none; }

/* number fields */
.rsmg-fields { display: grid; gap: 10px; }
.rsmg-fields.rsmg-two   { grid-template-columns: 1fr 1fr; }
.rsmg-fields.rsmg-three { grid-template-columns: 1fr 1fr 1fr; }
.rsmg-field { display: block; }
.rsmg-field .rsmg-lbl { display: block; font-size: 13px; color: var(--ink-soft); margin-bottom: 4px; }
.rsmg-field input {
  width: 100%;
  min-height: 48px;
  padding: 10px;
  font-size: 17px;
  font-variant-numeric: tabular-nums;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  border-radius: 0;
  -webkit-appearance: none;
  appearance: none;
}
.rsmg-field input:focus { outline: 2px solid var(--blue); outline-offset: -1px; }
.rsmg-field.rsmg-used input  { border-color: var(--green); background: var(--green-bg); font-weight: 600; }
.rsmg-field.rsmg-used .rsmg-lbl::after { content: " · used"; color: var(--green); font-weight: 600; }
.rsmg-field.rsmg-bad input   { border-color: var(--red); background: var(--red-bg); }
.rsmg-field[hidden] { display: none; }

.rsmg-check {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 11px 0;
  min-height: 48px;
  font-size: 15px;
  cursor: pointer;
}
.rsmg-check input { width: 22px; height: 22px; margin-top: 2px; flex: none; accent-color: var(--blue); }
.rsmg-check[hidden] { display: none; }
.rsmg-hint[hidden] { display: none; }

/* working-out panel */
.rsmg-working {
  margin-top: 12px;
  padding: 10px 12px;
  background: var(--panel);
  border-left: 3px solid var(--blue);
  font-size: 14px;
}
.rsmg-working .rsmg-formula {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  font-size: 16px;
}
.rsmg-working .rsmg-rule { color: var(--ink-soft); margin-top: 4px; }
.rsmg-working ol { margin: 8px 0 0; padding-left: 20px; }
.rsmg-working li { font-variant-numeric: tabular-nums; color: var(--ink-soft); }
.rsmg-working li.rsmg-pick { color: var(--green); font-weight: 600; }
.rsmg-working li.rsmg-blocked { color: var(--amber); }

details { margin-top: 12px; font-size: 14px; }
summary { cursor: pointer; color: var(--blue); }
details p { margin: 8px 0 0; color: var(--ink-soft); }

/* ---------- result ---------- */
.rsmg-result { border: 2px solid var(--ink); padding: 14px 16px; margin: 24px 0 16px; }
.rsmg-result h2 { margin: 0 0 10px; font-size: 16px; }
.rsmg-result .rsmg-pending { color: var(--ink-soft); font-size: 14px; margin: 0; }

.rsmg-numbers { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; margin: 0 0 12px; }
.rsmg-numbers div { border: 1px solid var(--line); padding: 10px; }
.rsmg-numbers .rsmg-k { font-size: 12px; color: var(--ink-soft); display: block; }
.rsmg-numbers .rsmg-v {
  font-size: 22px; font-weight: 700; font-variant-numeric: tabular-nums;
  color: var(--blue); display: block; line-height: 1.2;
}

.rsmg-msg { padding: 9px 11px; font-size: 14px; margin: 0 0 8px; border-left: 3px solid; }
.rsmg-msg.rsmg-err  { background: var(--red-bg);   border-color: var(--red);   color: var(--red); }
.rsmg-msg.rsmg-warn { background: var(--amber-bg); border-color: var(--amber); color: var(--amber); }
.rsmg-msg.rsmg-info { background: var(--panel);    border-color: var(--line);  color: var(--ink-soft); }

.rsmg-summary-box {
  width: 100%;
  min-height: 130px;
  font: 13px/1.5 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  padding: 10px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--ink);
  resize: vertical;
  margin-top: 10px;
}
.rsmg-copy-btn {
  min-height: 48px;
  width: 100%;
  margin-top: 8px;
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  background: var(--blue);
  border: 1px solid var(--blue);
  cursor: pointer;
}
.rsmg-copy-btn:active { opacity: .85; }

/* ---------- tbd + reference ---------- */
.rsmg-tbd {
  border: 1px dashed var(--line);
  padding: 12px 14px;
  margin: 0 0 20px;
  font-size: 14px;
  color: var(--ink-soft);
}
.rsmg-tbd h2 { margin: 0 0 6px; font-size: 15px; color: var(--ink); }

.rsmg-ref h2 { font-size: 15px; margin: 0 0 8px; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { border: 1px solid var(--line); padding: 8px 10px; text-align: left; font-variant-numeric: tabular-nums; }
th { background: var(--panel); font-weight: 600; }
tr.rsmg-active td { background: var(--green-bg); font-weight: 600; }
td.rsmg-no { color: var(--red); }

/* ---------- written guide (the crawlable half of the page) ---------- */
.rsmg-guide {
  max-width: 760px;
  margin: 8px auto 0;
  padding: 24px 16px 8px;
  border-top: 1px solid var(--line);
}
.rsmg-guide h2 { font-size: 20px; margin: 28px 0 10px; }
.rsmg-guide h2:first-child { margin-top: 0; }
.rsmg-guide h3 { font-size: 16px; margin: 20px 0 6px; }
.rsmg-guide p { margin: 0 0 10px; color: var(--ink-soft); }
.rsmg-guide strong, .rsmg-guide em { color: var(--ink); }
.rsmg-guide em { font-style: normal; text-decoration: underline; text-underline-offset: 2px; }
.rsmg-guide ul { margin: 0 0 10px; padding-left: 20px; color: var(--ink-soft); }
.rsmg-guide li { margin-bottom: 6px; }

@media (min-width: 900px) {
  .rsmg-guide { padding: 32px 24px 8px; }
}

.rsmg-page-foot {
  border-top: 1px solid var(--line);
  padding: 16px;
  font-size: 13px;
  color: var(--ink-soft);
  max-width: 1240px;
  margin: 0 auto;
}
.rsmg-page-foot p { margin: 0 0 8px; }
.rsmg-page-foot .rsmg-attrib { color: var(--ink); margin-bottom: 0; }
.rsmg-page-foot a { color: var(--blue); }

/* ---------- print: a copy for the van ---------- */
@media print {
  .rsmg-stage { position: static; }
  #svgRoot { height: 320px; }
  .rsmg-seg span { border: 1px solid #000; }
  .rsmg-copy-btn, details { display: none; }
  .rsmg-layout { display: block; }
  body { font-size: 12px; }
}

/* Quick answer and about blocks */
.rsmg-answer, .rsmg-about { max-width: 1240px; margin: 16px auto 0; padding: 16px 20px; box-sizing: border-box; }
.rsmg-answer { background: #fff; border: 1px solid #d9e3ea; border-left: 4px solid #1d6fa5; border-radius: 8px; }
.rsmg-answer h2, .rsmg-about h2 { margin: 0 0 8px; font-size: 18px; }
.rsmg-answer p, .rsmg-about p { margin: 0 0 10px; }
.rsmg-about p:last-child { margin-bottom: 0; }
.rsmg-table-wrap { overflow-x: auto; margin: 10px 0 14px; }
.rsmg-answer .rsmg-table-wrap { margin-bottom: 0; }
.rsmg-table-wrap th[scope="row"] { text-align: left; white-space: nowrap; }
.rsmg-buy { display: inline-block; margin-top: 12px; padding: 12px 28px; border-radius: 6px; background: var(--blue); color: #fff; font-weight: 700; text-decoration: none; }
.rsmg-buy:hover { filter: brightness(.92); }
.rsmg-buy:focus-visible { outline: 2px solid var(--blue); outline-offset: 2px; }
@media print { .rsmg-buy { display: none; } }
.rsmg-buy-box { margin-top: 16px; padding-top: 14px; border-top: 1px solid #d9e3ea; }
.rsmg-buy-box p { margin: 0; color: var(--ink-soft); }