/* 798 HANDS PIPE CALC. Follows the site theme's colours (style.css tokens). */
.calc { padding: 22px; }
.calc-head h1 { margin: 0 0 4px; }
.calc-head { margin-bottom: 14px; }

.calc-tabs { display: flex; gap: 6px; margin-bottom: 14px; flex-wrap: wrap; }
.calc-tab {
  font-family: var(--font-display); font-size: 14px; padding: 8px 16px; cursor: pointer;
  background: var(--bg-panel-raised); color: var(--text-muted);
  border: 1px solid var(--border-hairline); border-radius: 999px;
}
.calc-tab:hover { color: var(--text-main); }
.calc-tab.active { background: var(--accent); color: var(--on-accent); border-color: transparent; }

.calc-grid {
  display: grid; gap: 16px;
  grid-template-columns: minmax(300px, 360px) minmax(0, 1fr);
  align-items: start;
}
.calc-stage { display: flex; flex-direction: column; gap: 14px; min-width: 0; }
.calc-boxes { border: 1px solid var(--border-hairline); border-radius: 14px; padding: 10px 12px; background: var(--bg-panel-raised); }
.calc-boxes > summary { cursor: pointer; font-size: 13.5px; color: var(--text-muted); }
.calc-boxes[open] > summary { margin-bottom: 12px; color: var(--text-main); }
.calc-boxes .calc-form { max-width: 420px; }

/* ── the keypad ─────────────────────────────────────────────────────── */
.calc-pad {
  position: sticky; top: var(--col-top, 12px);
  display: flex; flex-direction: column; gap: 10px; padding: 14px;
  border-radius: 22px; border: 1px solid var(--border-hairline);
  background: linear-gradient(180deg, color-mix(in srgb, var(--bg-panel-raised) 85%, var(--text-main) 6%), var(--bg-panel-raised));
  box-shadow: inset 0 1px 0 color-mix(in srgb, var(--text-main) 10%, transparent), 0 10px 30px rgba(0,0,0,.25);
}
.pad-bar { display: flex; gap: 6px; }
.pad-bar-btn {
  font: 12px var(--font-body); padding: 5px 11px; border-radius: 999px; cursor: pointer;
  background: none; color: var(--text-muted); border: 1px solid var(--border-hairline);
}
.pad-bar-btn[aria-pressed="true"] { color: var(--accent-bright); border-color: var(--accent-bright); }
.pad-bar .pad-phone:last-child { margin-left: auto; }
.pad-phone { display: none; }
.pad-screen {
  position: relative; min-height: 104px; padding: 10px 14px 10px; border-radius: 14px;
  font-family: var(--font-mono); color: #1d2a1c;
  background: linear-gradient(180deg, #b9c7a5, #a5b590);
  box-shadow: inset 0 2px 6px rgba(0,0,0,.35), inset 0 0 0 1px rgba(0,0,0,.25);
}
.pad-flags { display: flex; gap: 8px; font-size: 10.5px; font-weight: 700; letter-spacing: .06em; min-height: 13px; opacity: .8; }
.pad-top { font-size: 12px; min-height: 15px; text-align: right; opacity: .75; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.pad-label { font-size: 12px; font-weight: 700; letter-spacing: .08em; min-height: 15px; }
.pad-value { text-align: right; font-size: 30px; font-weight: 700; line-height: 1.15; overflow-wrap: anywhere; }
.pad-mark { font-size: 11px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; margin-left: 6px; vertical-align: middle; }
.pad-sub { text-align: right; font-size: 11.5px; min-height: 14px; opacity: .75; }
.pad-screen.is-error .pad-value { font-size: 18px; }
.pad-tape {
  margin: 0; padding: 8px 10px 8px 30px; max-height: 180px; overflow: auto; border-radius: 12px;
  font: 12.5px var(--font-mono); background: var(--bg-base); border: 1px solid var(--border-hairline);
}
.pad-tape li { padding: 1px 0; }
.pad-keys { display: grid; grid-template-columns: repeat(5, 1fr); gap: 7px; }
.pad-key {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 0;
  min-height: 52px; padding: 2px 2px 6px; border-radius: 13px; cursor: pointer; user-select: none; -webkit-user-select: none;
  touch-action: manipulation; border: 1px solid rgba(0,0,0,.35); color: #f3f1ee;
  background: linear-gradient(180deg, #4a4f55, #3a3e43);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.12), 0 2px 0 rgba(0,0,0,.35);
  transition: transform .06s, filter .1s;
}
.pad-key span { font: 600 17px var(--font-display, var(--font-body)); line-height: 1.1; }
.pad-key small { font: 600 9.5px var(--font-body); color: var(--accent-bright); opacity: .9; min-height: 12px; letter-spacing: .02em; }
.pad-key:active, .pad-key.is-hit { transform: translateY(1px); filter: brightness(1.25); box-shadow: inset 0 1px 0 rgba(255,255,255,.08); }
.pad-key.is-num { background: linear-gradient(180deg, #d9dcdf, #c3c7cb); color: #1f2226; }
.pad-key.is-num small { color: transparent; }
.pad-key.is-num span { font-size: 21px; }
.pad-key.is-pipe { background: linear-gradient(180deg, color-mix(in srgb, var(--accent) 70%, #555), color-mix(in srgb, var(--accent) 55%, #333)); }
.pad-key.is-pipe small { color: #ffe2b8; }
.pad-key.is-cut { background: linear-gradient(180deg, var(--accent-bright), var(--accent)); color: var(--on-accent, #111); }
.pad-key.is-cut small { color: inherit; opacity: .75; }
.pad-key.is-unit { background: linear-gradient(180deg, #2b2f33, #202326); }
.pad-key.is-op { background: linear-gradient(180deg, #5b6168, #474c52); }
.pad-key.is-op span { font-size: 21px; }
.pad-key.is-eq { background: linear-gradient(180deg, #6c737a, #555b61); }
.pad-key.is-clear { background: linear-gradient(180deg, #a3402c, #82301f); }
.pad-key.is-2nd { background: linear-gradient(180deg, #2f3a48, #222b36); }
.pad-key.is-2nd span { color: var(--accent-bright); }
.calc-pad.is-second .pad-key small { color: #fff; text-shadow: 0 0 6px var(--accent-bright); }
.calc-pad.is-second .pad-key.is-2nd { filter: brightness(1.5); }
.calc-back-to-pad { display: none; }
.calc-left { display: flex; flex-direction: column; gap: 16px; min-width: 0; }
.calc-form { display: flex; flex-direction: column; gap: 10px; }
.calc-answers { display: flex; flex-direction: column; gap: 10px; }
.calc-view { min-width: 0; }

.calc-field { display: flex; flex-direction: column; gap: 4px; margin: 0; }
.calc-field label, .calc-field legend { font-size: 12.5px; color: var(--text-muted); }
.calc-field input, .calc-field select, #calc-den {
  font: 16px var(--font-mono); padding: 8px 10px; color: var(--text-main);
  background: var(--bg-base); border: 1px solid var(--border-hairline); border-radius: 10px; min-width: 0;
}
.calc-field input:focus, .calc-field select:focus { outline: 2px solid var(--accent-bright); outline-offset: 1px; }
.calc-field input[aria-invalid="true"] { border-color: var(--danger); }
.calc-field small { font-size: 11.5px; color: var(--text-muted); }
.calc-two { flex-direction: row; gap: 8px; }
.calc-two > div { flex: 1; display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.calc-know { border: 0; padding: 0; flex-direction: row; flex-wrap: wrap; gap: 6px; }
.calc-know legend { width: 100%; margin-bottom: 4px; }
.calc-know label {
  font-size: 13px; color: var(--text-main); cursor: pointer; padding: 6px 12px;
  border: 1px solid var(--border-hairline); border-radius: 999px; background: var(--bg-panel-raised);
}
.calc-know label:has(input:checked) { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.calc-know input { accent-color: var(--accent); margin: 0 4px 0 0; }
.calc-err { color: var(--danger); font-size: 12.5px; margin: 0; }
.calc [hidden], .calc-keypad[hidden] { display: none !important; }

.calc-msg { margin: 0; padding: 10px 12px; border-radius: 12px; font-size: 13.5px; line-height: 1.45;
  background: color-mix(in srgb, var(--danger) 14%, var(--bg-panel)); border: 1px solid color-mix(in srgb, var(--danger) 45%, transparent); }

.calc-results { display: flex; flex-direction: column; gap: 4px; }
.calc-row {
  display: grid; grid-template-columns: 1fr auto auto; grid-template-areas: "label value why" "label exact why";
  align-items: center; column-gap: 10px; padding: 7px 10px; border-radius: 12px;
  background: var(--bg-panel-raised); border: 1px solid transparent; transition: border-color .2s, background .2s;
}
.calc-row-label { grid-area: label; font-size: 13px; color: var(--text-muted); }
.calc-row-value { grid-area: value; font: 600 18px var(--font-mono); color: var(--text-main); text-align: right; white-space: nowrap; }
.calc-row-exact { grid-area: exact; font: 11px var(--font-mono); color: var(--text-muted); text-align: right; }
.calc-row > :last-child { grid-area: why; }
.calc-row.is-main { background: color-mix(in srgb, var(--accent) 16%, var(--bg-panel)); border-color: color-mix(in srgb, var(--accent) 50%, transparent); }
.calc-row.is-main .calc-row-value { font-size: 24px; }
.calc-row.is-main .calc-row-label { color: var(--text-main); font-weight: 600; }
.calc-row.is-lit { border-color: var(--accent-bright); }
.calc-mark { font: 600 10.5px var(--font-body); text-transform: uppercase; letter-spacing: .04em; margin-left: 6px;
  color: var(--brass, var(--accent-bright)); vertical-align: middle; }
.calc-why-btn {
  font-size: 12px; padding: 5px 10px; cursor: pointer; border-radius: 999px;
  background: none; color: var(--accent-bright); border: 1px solid color-mix(in srgb, var(--accent-bright) 50%, transparent);
}
.calc-why-btn:hover { background: color-mix(in srgb, var(--accent-bright) 12%, transparent); }
.calc-warn { margin: 0; padding: 8px 12px 8px 28px; font-size: 12.5px; line-height: 1.45; color: var(--text-main);
  border-radius: 12px; background: color-mix(in srgb, var(--brass, #c9a227) 12%, var(--bg-panel)); }

.calc-why { padding: 12px; border-radius: 14px; background: var(--bg-panel-raised); border: 1px solid var(--border-hairline); }
.calc-why-head { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; }
.calc-why-close { margin-left: auto; background: none; border: 0; color: var(--text-muted); font-size: 16px; cursor: pointer; }
.calc-steps { margin: 0; padding: 0 0 0 22px; display: flex; flex-direction: column; gap: 4px; }
.calc-step-title { background: none; border: 0; padding: 2px 0; color: var(--text-muted); font: 13.5px var(--font-body); cursor: pointer; text-align: left; }
.calc-step.is-on .calc-step-title { color: var(--text-main); font-weight: 600; }
.calc-step-body { display: flex; flex-direction: column; gap: 4px; margin: 4px 0 6px; }
.calc-formula, .calc-sub { font: 13px var(--font-mono); padding: 5px 8px; border-radius: 8px; background: var(--bg-base); overflow-wrap: anywhere; }
.calc-formula { color: var(--accent-bright); }
.calc-step-result { font: 15px var(--font-mono); }
.calc-step-note { margin: 2px 0 0; font-size: 12.5px; line-height: 1.5; color: var(--text-muted); }
.calc-why-nav { display: flex; justify-content: space-between; margin-top: 8px; }
.calc-why-nav .btn { padding: 6px 12px; }

.calc-view .calc3d, .calc-flat {
  display: block; width: 100%; height: min(68vh, 560px); min-height: 300px; position: relative; overflow: hidden;
  border-radius: 16px; border: 1px solid var(--border-hairline);
  background: radial-gradient(ellipse at 50% 35%, var(--bg-panel-raised), var(--bg-base));
}
.calc3d-canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; touch-action: none; }
.calc3d-labels { position: absolute; inset: 0; pointer-events: none; overflow: hidden; }
.calc3d-label {
  position: absolute; left: 0; top: 0; white-space: nowrap; font: 600 12.5px var(--font-mono); color: var(--text-main);
  padding: 2px 7px; border-radius: 8px; background: color-mix(in srgb, var(--bg-base) 78%, transparent);
  border: 1px solid var(--border-hairline);
}
.calc3d-label.is-minor { font-weight: 400; font-size: 11.5px; }
.calc3d-label.is-lit { border-color: var(--accent-bright); color: var(--accent-bright); }
.calc-view-bar { display: flex; align-items: center; gap: 10px; margin-top: 6px; }
.calc-view-bar .btn { margin-left: auto; padding: 6px 12px; }

/* the flat view */
.calc-flat .flat-pipe { fill: none; stroke: #8b9299; stroke-linejoin: round; opacity: .85; }
.calc-flat .flat-cut { fill: none; stroke: var(--accent); }
.calc-flat .flat-cut.is-lit { stroke: var(--accent-bright); }
.calc-flat .flat-centre { fill: none; stroke: var(--text-muted); }
.calc-flat .flat-tri { fill: var(--accent-bright); fill-opacity: .1; stroke: none; }
.calc-flat .flat-tri.is-lit { fill-opacity: .25; }
.calc-flat .flat-dim path { stroke: var(--text-main); fill: none; }
.calc-flat .flat-dim text { fill: var(--text-main); font-family: var(--font-mono); paint-order: stroke; stroke: var(--bg-base); stroke-width: .25em; }
.calc-flat .flat-dim.is-lit path { stroke: var(--accent-bright); }
.calc-flat .flat-dim.is-lit text { fill: var(--accent-bright); }
.calc-flat .flat-dim.is-dim { opacity: .25; }
.calc-flat .flat-caption { fill: var(--text-muted); font-family: var(--font-body); }

.calc-units { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px; margin-top: 16px; padding: 10px 12px;
  border-radius: 14px; background: var(--bg-panel-raised); font-size: 13px; }
.calc-units label { display: inline-flex; align-items: center; gap: 5px; cursor: pointer; }
.calc-units input { accent-color: var(--accent); }
.calc-units-label { color: var(--text-muted); }
#calc-den { font-size: 13px; padding: 4px 6px; }
.calc-units .btn { padding: 6px 12px; }
.calc-foot { margin-top: 12px; }

/* the fractions keypad */
.calc-keypad {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 60; padding: 8px 10px calc(10px + env(safe-area-inset-bottom));
  background: var(--bg-panel); border-top: 1px solid var(--border-hairline); box-shadow: 0 -8px 24px rgba(0,0,0,.35);
}
.calc-keypad-for { font-size: 12px; color: var(--text-muted); margin: 0 auto 6px; max-width: 520px; }
.calc-keypad-keys { display: grid; grid-template-columns: repeat(4, 1fr); gap: 6px; max-width: 520px; margin: 0 auto; }
.calc-keypad button {
  font: 600 20px var(--font-mono); padding: 12px 0; border-radius: 12px; cursor: pointer;
  background: var(--bg-panel-raised); color: var(--text-main); border: 1px solid var(--border-hairline);
}
.calc-keypad button:active { background: var(--accent); color: var(--on-accent); }
.calc-keypad .is-wide2 { grid-column: span 2; font-size: 16px; }
.calc-keypad .is-done { background: var(--accent); color: var(--on-accent); border-color: transparent; }

@media (max-width: 820px) {
  .pad-phone { display: inline-flex; align-items: center; gap: 8px; }
  .calc-pad { position: static; }
  /* The keypad fills the screen, like the calculator in your pocket. */
  body.calc-full .calc-pad {
    position: fixed; inset: 0; z-index: 80; border-radius: 0; border: 0; height: 100dvh;
    padding: calc(10px + env(safe-area-inset-top)) 10px calc(10px + env(safe-area-inset-bottom));
    background: var(--bg-base);
  }
  body.calc-full .pad-keys { flex: 1; grid-auto-rows: 1fr; }
  body.calc-full .pad-key { min-height: 0; }
  body.calc-full .pad-value { font-size: 34px; }
  body.calc-full.calc-show-stage .calc-pad { display: none; }
  body.calc-full .calc-stage { display: none; }
  body.calc-full.calc-show-stage .calc-stage {
    display: flex; position: fixed; inset: 0; z-index: 80; overflow: auto; background: var(--bg-base);
    padding: calc(10px + env(safe-area-inset-top)) 12px calc(16px + env(safe-area-inset-bottom));
  }
  body.calc-full .tape-open .pad-tape { max-height: 22vh; }
  body.calc-full { overflow: hidden; }
  body.calc-full.calc-show-stage { overflow: auto; }
  body.calc-full .calc-back-to-pad { display: none; }
  .calc-back-to-pad {
    display: block; position: fixed; right: 14px; bottom: calc(14px + env(safe-area-inset-bottom)); z-index: 60;
    padding: 12px 18px; border-radius: 999px; border: 0; cursor: pointer;
    font: 600 15px var(--font-display, var(--font-body)); background: var(--accent); color: var(--on-accent, #111);
    box-shadow: 0 6px 18px rgba(0,0,0,.4);
  }
  .stage-bar { display: flex; align-items: center; gap: 10px; }
  .calc { padding: 14px; }
  .calc-grid { grid-template-columns: minmax(0, 1fr); }
  .calc-view { position: static; }
  .calc-view .calc3d, .calc-flat { height: 72vw; max-height: 460px; }
  .calc-row.is-main .calc-row-value { font-size: 22px; }
  body:has(.calc-keypad:not([hidden])) .main-panel { padding-bottom: 320px; }
  body:has(.calc-keypad:not([hidden])) .calc-back-to-pad { display: none; }
}

/* ── tools: Offsets | Saddles & branches (2.14.0) ─────────────────────── */
.calc-tools { display: flex; gap: 6px; flex-wrap: wrap; margin: 0 0 14px; }
.calc-tool {
  font-family: var(--font-display); font-size: 14px; padding: 8px 16px; cursor: pointer; border-radius: 999px;
  background: var(--bg-panel-raised); color: var(--text-muted); border: 1px solid var(--border-hairline);
}
.calc-tool:hover { color: var(--text-main); }
.calc-tool.active { background: var(--accent); color: var(--on-accent); border-color: transparent; }
.saddle-tool { min-width: 0; }
.saddle-tool .calc-form { gap: 12px; }
.saddle-pipe { border: 1px solid var(--border-hairline); border-radius: 14px; padding: 8px 10px 10px; }
.saddle-pipe legend { padding: 0 4px; }
.saddle-pipe .saddle-wallval { margin-top: 6px; }
.saddle-fit label, .saddle-place label { font-size: 12.5px; }
.saddle-out { display: flex; flex-direction: column; gap: 12px; }
.saddle-card { padding: 10px 12px 12px; border-radius: 14px; background: var(--bg-panel-raised); border: 1px solid var(--border-hairline); }
.saddle-card h3 { margin: 0 0 8px; font-size: 15px; }
.saddle-card h3 small { font-weight: 400; margin-left: 6px; }
.saddle-tpl { display: block; width: 100%; max-height: 300px; background: #fff; border-radius: 10px; }
.saddle-table-wrap { overflow-x: auto; }
.saddle-table { width: 100%; border-collapse: collapse; font: 13px var(--font-mono); }
.saddle-table th { text-align: left; font: 600 12px var(--font-body); color: var(--text-muted); padding: 4px 8px; border-bottom: 1px solid var(--border-hairline); }
.saddle-table td { padding: 4px 8px; border-bottom: 1px solid color-mix(in srgb, var(--border-hairline) 50%, transparent); white-space: nowrap; }
.saddle-table tr:nth-child(4n+1) td { background: color-mix(in srgb, var(--accent) 7%, transparent); }
.saddle-print { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px; padding: 10px 12px; border-radius: 14px; background: var(--bg-panel-raised); font-size: 13px; }
.saddle-print label { display: inline-flex; align-items: center; gap: 5px; }
.saddle-print select { font: 13px var(--font-body); padding: 4px 6px; border-radius: 8px; background: var(--bg-base); color: var(--text-main); border: 1px solid var(--border-hairline); }
.saddle-print .muted-note { flex-basis: 100%; }
.saddle-see { display: inline-flex; align-items: center; gap: 5px; font-size: 12.5px; margin-left: auto; }
.saddle-see input { accent-color: var(--accent); }
body:not([data-calc-tool="offset"])[data-calc-tool] .calc-back-to-pad { display: none !important; }
.calc-print { display: none; }

/* Printing the templates: only they print, at full size. */
@media print {
  body.printing-templates > *:not(#calc-print) { display: none !important; }
  body.printing-templates { background: #fff !important; margin: 0; }
  html:has(body.printing-templates) { background: #fff !important; }
  body.printing-templates #calc-print { display: block; }
  .print-page { page-break-after: always; break-after: page; overflow: hidden; }
  .print-page:last-child { page-break-after: auto; break-after: auto; }
  .print-page svg { display: block; }
}
body:not([data-calc-tool="offset"])[data-calc-tool] .stage-bar { display: none !important; }

/* 2.16.0: the miters & elbows tool's three jobs */
.miter-modes { display: flex; margin-bottom: 12px; }
.miter-modes label { white-space: nowrap; }

/* 2.16.1: check my printer */
.print-check { flex-basis: 100%; border: 1px solid var(--border-hairline); border-radius: 10px; padding: 6px 10px; }
.print-check summary { cursor: pointer; font-weight: 600; }
.print-check[open] summary { margin-bottom: 6px; }
.print-check-row { display: flex; flex-wrap: wrap; gap: 8px 14px; align-items: center; margin: 6px 0; }
.print-check input { width: 9.5em; font: 13px var(--font-mono, monospace); padding: 4px 6px; border-radius: 8px; background: var(--bg-base); color: var(--text-main); border: 1px solid var(--border-hairline); }

/* 2.16.2: works with no signal */
.calc-offline { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 10px; margin-top: 8px; }
.calc-offline .btn { padding: 4px 10px; font-size: 12px; }
.calc-offline-no { opacity: 0.8; }
body.calc-saved { margin: 0; }
.calc-saved-head { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.calc-saved-note { font-size: 13px; }
.calc-saved-main { max-width: 1400px; margin: 0 auto; padding: 16px; box-sizing: border-box; }
@media (max-width: 820px) { .calc-saved-main { padding: 8px; } }

/* 2.17.0: the keypad's Tools menu (phones), and the Fabrication tab */
.pad-tools-wrap { position: relative; display: inline-flex; }
.pad-tools-menu { position: absolute; top: calc(100% + 6px); left: 0; z-index: 30; display: flex; flex-direction: column; min-width: 190px; padding: 6px;
  border-radius: 12px; background: var(--bg-panel-raised); border: 1px solid var(--border-hairline); box-shadow: 0 10px 28px rgba(0, 0, 0, 0.45); }
.pad-tools-menu[hidden] { display: none; }
.pad-tools-menu button { text-align: left; padding: 11px 12px; border: 0; border-radius: 8px; background: none; color: var(--text-main); font: 600 15px var(--font-body); cursor: pointer; }
.pad-tools-menu button:hover, .pad-tools-menu button:focus-visible { background: var(--bg-base); color: var(--accent-bright); }
.fab-modes { display: flex; margin-bottom: 12px; }
.fab-modes label { white-space: nowrap; }
.fab-check { display: inline-flex; align-items: center; gap: 6px; margin-top: 26px; }

/* 2.18.0: Practice and the glossary */
.calc3d-quiet .calc3d-label { visibility: hidden; }
.learn-levels { display: flex; margin: 4px 0 6px; }
.learn-levels label { white-space: nowrap; }
.learn-score { font: 600 14px var(--font-body); margin: 4px 0; }
.learn-q { font: 600 18px/1.45 var(--font-body); margin: 6px 0 12px; }
.learn-answer { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.learn-answer input { flex: 1 1 160px; min-width: 0; font: 600 18px var(--font-mono, monospace); padding: 10px 12px; border-radius: 10px; background: var(--bg-base); color: var(--text-main); border: 1px solid var(--border-hairline); }
.learn-said { margin: 10px 0 0; font-weight: 600; min-height: 1.2em; }
.learn-said.is-good { color: #4cae6b; }
.learn-said.is-bad { color: var(--danger, #d9534f); }
.learn-card .calc-why { margin-top: 12px; }
.gloss-q { width: 100%; box-sizing: border-box; font: 14px var(--font-body); padding: 8px 10px; border-radius: 10px; background: var(--bg-base); color: var(--text-main); border: 1px solid var(--border-hairline); margin-bottom: 8px; }
.gloss-list { margin: 0; max-height: 420px; overflow: auto; }
.gloss-list dt { font-weight: 700; margin-top: 10px; }
.gloss-list dd { margin: 2px 0 0; color: var(--text-muted, inherit); font-size: 14px; line-height: 1.45; }
.gloss-term { all: unset; cursor: help; border-bottom: 1px dotted currentColor; color: inherit; }
.gloss-term:hover, .gloss-term:focus-visible { color: var(--accent-bright); }
.gloss-pop { position: absolute; z-index: 60; padding: 10px 12px; border-radius: 12px; background: var(--bg-panel-raised); color: var(--text-main); border: 1px solid var(--border-hairline);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.45); font-size: 14px; line-height: 1.45; box-sizing: border-box; }
.gloss-pop[hidden] { display: none; }
.gloss-pop p { margin: 4px 0 0; }

/* 2.18.1: watch it done, and laying it out by hand */
.calc-watch { margin-left: auto; padding: 4px 10px; font-size: 12px; }
.calc-watch[aria-pressed="true"] { color: var(--accent-bright); border-color: var(--accent-bright); }
.calc-why-head .calc-watch + .calc-why-close { margin-left: 6px; }
.hand-card .hand-draw { background: #fff; border-radius: 10px; padding: 8px; }
.hand-svg { width: 100%; height: auto; max-height: 560px; display: block; }
.hand-step { font-size: 15px; line-height: 1.45; margin: 10px 0 6px; }
.hand-nav { display: flex; flex-wrap: wrap; gap: 8px; }
.hand-svg line, .hand-svg circle, .hand-svg polyline { vector-effect: non-scaling-stroke; }
.hl-line { fill: none; stroke: #222; stroke-width: 1.4px; }
.hl-thick { stroke-width: 2.2px; }
.hl-thin { fill: none; stroke: #888; stroke-width: 0.8px; }
.hl-dash { fill: none; stroke: #999; stroke-width: 0.8px; stroke-dasharray: 5 4; }
.hl-ref { stroke: #2a6fb0; stroke-width: 1.2px; }
.hl-meas { fill: none; stroke: #2a6fb0; stroke-width: 1px; stroke-dasharray: 2 3; }
.hl-cut { fill: none; stroke: #c0392b; stroke-width: 2.4px; }
.hl-dot { fill: #222; }
.hl-key { fill: #c0392b; }
.hl-text { fill: #333; }
.hl-num { font-size: 0.8em; fill: #555; }
.hl-now { stroke: #e8701a !important; fill-opacity: 1; }
circle.hl-now.hl-dot, circle.hl-now.hl-key { fill: #e8701a; stroke: none; }
text.hl-now { fill: #e8701a; stroke: none !important; }
.hand-print h2 { font: 700 16pt sans-serif; margin: 0 0 6pt; color: #000; }
.hand-print ol { font: 9.5pt/1.35 sans-serif; color: #000; margin: 6pt 0 0 14pt; padding: 0; columns: 2; }
.hand-print .hand-foot { font: 8pt sans-serif; color: #555; margin: 4pt 0 0; }

/* 2.19.0: drag to learn */
.slide-btn { padding: 4px 10px; font-size: 12px; white-space: nowrap; }
.slide-btn[aria-expanded="true"] { color: var(--accent-bright); border-color: var(--accent-bright); }
.slide-panel { margin-top: 8px; padding: 10px 12px; border-radius: 12px; background: var(--bg-panel-raised); display: grid; gap: 8px; }
.slide-panel[hidden] { display: none; }
.slide-head { font-size: 13px; }
.slide-read { font-size: 15px; min-height: 1.3em; }
.slide-read strong { font: 700 18px var(--font-mono, monospace); color: var(--accent-bright); margin-left: 6px; }
.slide-err { color: var(--danger, #d9534f); font-size: 13px; }
.slide-row { display: grid; grid-template-columns: minmax(90px, 9em) 1fr minmax(64px, 6.5em); align-items: center; gap: 10px; font-size: 13px; }
.slide-row input[type=range] { width: 100%; accent-color: var(--accent); height: 28px; }
.slide-row output { font: 600 13px var(--font-mono, monospace); text-align: right; }
@media (max-width: 520px) { .slide-row { grid-template-columns: 1fr minmax(64px, 6em); } .slide-row .slide-label { grid-column: 1 / -1; } }
.slide-pair { display: inline-block; margin-right: 18px; }
/* 2.19.0: pocket cards */
.cards-pick { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; font-size: 13px; }
@media (max-width: 700px) { .cards-pick { grid-template-columns: 1fr; } }
.cards-sizes, .cards-kinds { display: flex; flex-wrap: wrap; gap: 4px 12px; margin-top: 6px; }
.cards-sizes label, .cards-kinds label { display: inline-flex; align-items: center; gap: 4px; white-space: nowrap; }
.cards-cut { display: inline-flex; gap: 6px; align-items: center; margin-top: 8px; }
.cards-cut select { font: 13px var(--font-body); padding: 3px 6px; border-radius: 8px; background: var(--bg-base); color: var(--text-main); border: 1px solid var(--border-hairline); }
.cards-preview { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 12px; margin: 10px 0; }
.pcard { width: 100%; height: auto; display: block; border-radius: 10px; box-shadow: 0 4px 14px rgba(0,0,0,0.35); }
.cards-bar { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.learn-daily { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin: 10px 0 4px; }

/* Pipe facts (2.21.0) */
.facts-modes { display: flex; margin-bottom: 8px; }
.facts-modes label { white-space: nowrap; }
.facts-rule { margin: 0 0 10px; font-size: 12px; }
.calc-three { display: flex; gap: 8px; }
.calc-three input { flex: 1; width: 100%; }
.facts-rod { border: 1px solid var(--border-hairline); border-radius: 12px; padding: 8px 10px 10px; display: flex; flex-direction: column; gap: 8px; }
.facts-rod legend { padding: 0 4px; }
/* 2.22.1: bolting box, the A/B warning, the tightening order */
.facts-bolt { border: 1px solid var(--border-hairline); border-radius: 12px; padding: 8px 10px 10px; display: flex; flex-direction: column; gap: 8px; }
.facts-bolt legend { padding: 0 4px; }
.facts-bolt, .facts-rod { min-width: 0; }
.facts-bolt .calc-two, .facts-rod .calc-two { display: flex; }
.facts-bolt > div, .facts-rod > div { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.facts-bolt input, .facts-bolt select { width: 100%; box-sizing: border-box; min-width: 0; }
.facts-ab { margin: 0; padding: 6px 10px; border-radius: 10px; border: 1px solid var(--danger); color: var(--text-main); }
.facts-order { display: flex; flex-wrap: wrap; gap: 4px 6px; margin: 8px 0 0; padding: 0 0 0 4px; list-style: none; counter-reset: st; font: 13px/1.3 var(--font-mono); }
.facts-order li { counter-increment: st; padding: 2px 7px; border-radius: 999px; background: var(--bg-base); border: 1px solid var(--border-hairline); }
.facts-order li::before { content: counter(st) ": "; color: var(--accent-bright); font-weight: 700; }
.calc-field textarea {
  font: 15px/1.45 var(--font-mono); padding: 8px 10px; color: var(--text-main); resize: vertical;
  background: var(--bg-base); border: 1px solid var(--border-hairline); border-radius: 10px; min-width: 0; width: 100%; box-sizing: border-box;
}
.calc-field textarea:focus { outline: 2px solid var(--accent-bright); outline-offset: 1px; }
.facts-waiting { margin: 2px 0; font-size: 12.5px; }
.facts-section { display: block; width: 100%; max-height: 420px; background: #fff; border-radius: 10px; }
#facts-table td.is-bad { color: var(--danger); }

/* 2.26.0 AptoCalc: memory keys, the name on the face, the conversions, the "coming from" card */
.pad-key.is-mem { background: linear-gradient(180deg, #34404a, #283139); }
.pad-key.is-mem span { font-size: 15px; }
.pad-key.is-fn span { font-size: 15.5px; }
.pad-brand { margin: -2px 4px -4px; font: 700 12px var(--font-display, var(--font-body)); letter-spacing: .14em; color: var(--text-muted); opacity: .85; }
.calc-pad.conv-open .pad-keys { display: none; }
.pad-conv { display: flex; flex-direction: column; gap: 8px; max-height: 470px; overflow: auto; padding: 10px; border-radius: 14px;
  background: var(--bg-base); border: 1px solid var(--border-hairline); }
.pad-conv[hidden] { display: none; }
.pad-conv-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; font-size: 12.5px; color: var(--text-muted); }
.pad-conv-group { display: grid; grid-template-columns: repeat(auto-fill, minmax(118px, 1fr)); gap: 6px; }
.pad-conv-group h3 { grid-column: 1 / -1; margin: 4px 0 0; font: 700 11px var(--font-body); letter-spacing: .1em; text-transform: uppercase; color: var(--accent-bright); }
.pad-conv button { padding: 10px 8px; border-radius: 10px; cursor: pointer; text-align: center; font: 600 13.5px var(--font-body);
  background: var(--bg-panel-raised); color: var(--text-main); border: 1px solid var(--border-hairline); }
.pad-conv button:hover, .pad-conv button:focus-visible { border-color: var(--accent-bright); color: var(--accent-bright); }
.pad-conv .pad-conv-close { padding: 5px 12px; border-radius: 999px; font-size: 12px; }
.pad-migrate { font-size: 13px; color: var(--text-muted); border-top: 1px solid var(--border-hairline); padding-top: 8px; }
.pad-migrate summary { cursor: pointer; color: var(--text-main); font-weight: 600; }
.pad-migrate ul { margin: 6px 0; padding-left: 18px; display: flex; flex-direction: column; gap: 4px; }
.pad-migrate p { margin: 6px 0; }
.pad-migrate kbd { font: 12px var(--font-mono); padding: 0 4px; border-radius: 4px; border: 1px solid var(--border-hairline); background: var(--bg-base); }
@media (max-width: 820px) {
  body.calc-full .pad-migrate { display: none; }
  body.calc-full .pad-conv { flex: 1; max-height: none; }
  body.calc-full .pad-brand { margin: -4px 4px -6px; font-size: 10px; }
  body.calc-full .pad-keys { gap: 6px; }
  body.calc-full .pad-key span { font-size: 15px; }
  body.calc-full .pad-key.is-num span { font-size: 20px; }
}

/* 2.26.1 Big keys: bigger type for everyone, a keypad that grows with the screen, and A− / A+
   (body[data-pad-size] 1–4, saved per device by calc_pad.js as pipecalc-padsize). --pk scales every size. */
body { --pk: 1; --pad-w: clamp(360px, 25vw, 520px); }
body[data-pad-size="2"] { --pk: 1.2; --pad-w: clamp(420px, 31vw, 640px); }
body[data-pad-size="3"] { --pk: 1.4; --pad-w: clamp(480px, 37vw, 760px); }
body[data-pad-size="4"] { --pk: 1.65; --pad-w: clamp(540px, 44vw, 900px); }
@media (min-width: 1800px) { body:not([data-pad-size]), body[data-pad-size="1"] { --pk: 1.12; } }
.calc-grid { grid-template-columns: minmax(300px, var(--pad-w)) minmax(0, 1fr); }
.pad-key { min-height: calc(60px * var(--pk)); padding: 3px 2px 7px; }
.pad-key span { font-size: calc(20px * var(--pk)); }
.pad-key small { font: 700 calc(13.5px * var(--pk)) var(--font-body); min-height: calc(16px * var(--pk)); opacity: 1; color: color-mix(in srgb, var(--accent-bright) 80%, #fff); line-height: 1.15; }
.pad-key.is-pipe small { color: #fff0d6; }
.pad-key.is-num span, .pad-key.is-op span { font-size: calc(26px * var(--pk)); }
.pad-key.is-mem span { font-size: calc(18px * var(--pk)); }
.pad-key.is-fn span { font-size: calc(18.5px * var(--pk)); }
.pad-screen { min-height: calc(118px * var(--pk)); }
.pad-flags { font-size: calc(12px * var(--pk)); min-height: calc(15px * var(--pk)); }
.pad-top { font-size: calc(14px * var(--pk)); min-height: calc(17px * var(--pk)); }
.pad-label { font-size: calc(14px * var(--pk)); min-height: calc(17px * var(--pk)); }
.pad-value { font-size: calc(40px * var(--pk)); }
.pad-mark { font-size: calc(13px * var(--pk)); }
.pad-sub { font-size: calc(13.5px * var(--pk)); min-height: calc(16px * var(--pk)); }
.pad-screen.is-error .pad-value { font-size: calc(22px * var(--pk)); }
.pad-tape { font-size: calc(14px * var(--pk)); }
.pad-brand { font-size: calc(13px * var(--pk)); }
.pad-bar-btn { font-size: calc(13px * var(--pk)); }
.pad-conv button { font-size: calc(15px * var(--pk)); padding: calc(11px * var(--pk)) 8px; }
.pad-conv-group { grid-template-columns: repeat(auto-fill, minmax(calc(130px * var(--pk)), 1fr)); }
.pad-conv-group h3 { font-size: calc(12.5px * var(--pk)); }
.pad-conv-head { font-size: calc(14px * var(--pk)); }
.pad-migrate { font-size: calc(14px * var(--pk)); }
/* the biggest steps: plain white labels on the dark keys */
body[data-pad-size="3"] .pad-key small, body[data-pad-size="4"] .pad-key small { color: #fff; text-shadow: 0 1px 0 rgba(0,0,0,.6); }
body[data-pad-size="3"] .pad-key.is-cut small, body[data-pad-size="4"] .pad-key.is-cut small { color: inherit; text-shadow: none; opacity: 1; }
.pad-size { display: inline-flex; gap: 4px; }
.pad-size .pad-bar-btn { min-width: calc(40px * var(--pk)); font-weight: 700; padding-inline: 8px; }
.pad-size .pad-bar-btn:disabled { opacity: .35; cursor: default; }
.pad-bar { flex-wrap: wrap; align-items: center; }
@media (max-width: 820px) {
  /* Phones: words are held to the key's width; numbers and the display still grow. */
  body.calc-full .pad-key span { font-size: min(calc(17px * var(--pk)), 4.8vw); }
  body.calc-full .pad-key small { font-size: min(calc(12px * var(--pk)), 3.5vw); min-height: 0; }
  body.calc-full .pad-key.is-num span, body.calc-full .pad-key.is-op span { font-size: min(calc(24px * var(--pk)), 8vw); }
  body.calc-full .pad-value { font-size: min(calc(36px * var(--pk)), 11vw); }
  body.calc-full .pad-screen { min-height: 0; padding: 8px 12px; }
  body.calc-full .pad-bar-btn { font-size: 13px; padding: 5px 9px; }
  body.calc-full .pad-size .pad-bar-btn { min-width: 36px; }
  /* Larger and Huge: the keys stack taller and the keypad scrolls, rather than squashing */
  body.calc-full[data-pad-size="3"] .calc-pad, body.calc-full[data-pad-size="4"] .calc-pad { overflow-y: auto; }
  body.calc-full[data-pad-size="3"] .pad-keys, body.calc-full[data-pad-size="4"] .pad-keys { flex: none; grid-auto-rows: calc(56px * var(--pk)); }
  body.calc-full[data-pad-size="3"] .calc-pad > *, body.calc-full[data-pad-size="4"] .calc-pad > * { flex-shrink: 0; }
  .calc-grid { grid-template-columns: minmax(0, 1fr); }
}

/* 2.30.0 AptoCalc Basic (/calc): the keypad, a few answers beside it, and the Visualize pop-up */
.calc-basic-head { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 16px; }
.calc-basic-head h1 { margin: 0; }
.calc-basic-head p { flex: 1 1 26em; margin: 0; }
.calc-to-bench { margin-left: auto; }
.calc-basic-grid { display: grid; grid-template-columns: minmax(300px, var(--pad-w, 380px)) minmax(0, 1fr); gap: 18px; align-items: start; margin-top: 14px; }
.calc-basic-side { display: flex; flex-direction: column; gap: 12px; min-width: 0; }
.calc-viz-btn { font-size: calc(17px * var(--pk, 1)); padding: 14px 18px; border-radius: 14px; }
.calc-basic-answers { display: flex; flex-direction: column; gap: 6px; }
.calc-basic-units { display: flex; flex-wrap: wrap; gap: 6px 12px; align-items: center; font-size: 14px; }
.calc-basic-join { margin: 0; padding: 10px 12px; border: 1px dashed var(--border-hairline); border-radius: 12px; color: var(--text-muted); }
.calc-bench-tag { font-size: .45em; letter-spacing: .12em; text-transform: uppercase; color: var(--text-muted); vertical-align: middle; }
.calc-bench-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 14px; margin-top: 6px; }
/* Visualize (2.47.0: a window over the keypad, not the whole screen): the dimmed backdrop closes it when tapped,
   ✕ top right, ⛶ Full screen fills the screen (and asks the browser for real full screen where it can). */
.viz { position: fixed; inset: 0; z-index: 120; display: flex; align-items: center; justify-content: center;
  background: rgba(0, 0, 0, .55); padding: calc(10px + env(safe-area-inset-top)) 10px calc(10px + env(safe-area-inset-bottom)); }
.viz-card { display: flex; flex-direction: column; width: min(920px, 100%); height: min(640px, 82vh); height: min(640px, 82dvh);
  background: var(--bg-base); border: 1px solid var(--border-hairline); border-radius: 18px; padding: 10px 12px 12px;
  box-shadow: 0 20px 60px rgba(0, 0, 0, .5); }
.viz.viz-max { padding: 0; background: var(--bg-base); }
.viz.viz-max .viz-card { width: 100%; height: 100%; border-radius: 0; border: 0; box-shadow: none;
  padding: calc(8px + env(safe-area-inset-top)) 10px calc(10px + env(safe-area-inset-bottom)); }
@media (max-width: 820px) {
  .viz-card { height: min(520px, 64vh); height: min(520px, 64dvh); padding: 8px 8px 10px; }
  .viz-how, .viz-w2 { display: none; }
  .viz-bar { flex-wrap: nowrap; gap: 6px; }
  .viz-bar strong { flex: 1 1 auto; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 15px; }
  .viz-bar .btn { flex: 0 0 auto; padding-left: 10px; padding-right: 10px; }
}
.viz[hidden] { display: none; }
.viz-bar { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; padding-bottom: 6px; }
.viz-bar strong { font-size: calc(16px * var(--pk, 1)); }
.viz-how { margin-right: auto; }
.viz-close { font-size: 22px; min-width: 48px; min-height: 44px; margin-left: auto; }
#viz-full { min-height: 44px; }
.viz-3d { position: relative; flex: 1 1 auto; min-height: 0; height: auto; overflow: hidden; border-radius: 14px; touch-action: none;
  background: radial-gradient(ellipse at 50% 40%, color-mix(in srgb, var(--bg-panel-raised) 90%, var(--text-main) 4%), var(--bg-base)); }
.viz-3d canvas { touch-action: none; }
.viz-msg { margin: 10px 0; text-align: center; color: var(--text-muted); font-size: 15px; }
.viz-sum { display: flex; flex-wrap: wrap; justify-content: center; gap: 6px 18px; padding-top: 8px; font-size: calc(16px * var(--pk, 1)); }
.viz-sum strong { color: var(--accent-bright); }
body.viz-showing { overflow: hidden; }
@media (max-width: 820px) {
  .calc-basic-grid { grid-template-columns: minmax(0, 1fr); }
  .calc-to-bench { margin-left: 0; }
}

/* AptoCalc in the coming-soon page's frame (2.47.0, /aptocalc, calc_embed.html): no page around it, the panel behind
   shows through, never full-screen (calc_pad.js), and the frame is sized to it (splash_apto.js). */
body.calc-embed { background: transparent; margin: 0; min-height: 0; }
body.calc-embed .calc-embed-main { padding: 2px; margin: 0; }
body.calc-embed .calc-back-to-pad, body.calc-embed #pad-exit { display: none !important; }
body.calc-embed .calc-foot { margin: 10px 2px 0; }