/* Topo Map Practice: a survey office map table. Cool grey board, cream map paper, USGS contour brown and water blue. */
:root {
  --bg: #e7ecef;
  --panel: #f7f9fa;
  --ink: #1b2328;
  --muted: #4a575f;
  --line: #c2ccd2;
  --accent: #8a4316;
  --accent-ink: #ffffff;
  --water: #1c64a8;
  --ok: #1d6a37;
  --ok-soft: #e0f0e4;
  --close: #8a5a00;
  --close-soft: #f6ecd6;
  --bad: #a32020;
  --bad-soft: #f8e3e1;
  --focus: #1a5fb4;
  --map-paper: #fbf8ef;
  --contour: #9a5d28;
  --contour-index: #7b4417;
  --map-ink: #111111;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --r: 4px;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #151a1e;
    --panel: #1d2429;
    --ink: #e4eaee;
    --muted: #a3b1ba;
    --line: #34414a;
    --accent: #e39a62;
    --accent-ink: #1b0f06;
    --water: #7ab4ec;
    --ok: #7fd394;
    --ok-soft: #1b3324;
    --close: #f0c066;
    --close-soft: #3a2f17;
    --bad: #f39a90;
    --bad-soft: #3d2120;
    --focus: #8ab8ff;
    --map-paper: #ece6d6;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 17px/1.55 var(--sans); }
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 16px; }
a { color: var(--accent); text-underline-offset: 2px; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--panel); padding: 8px 12px; z-index: 10; }
.skip:focus { left: 8px; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

.hero { padding: 20px 0 6px; border-bottom: 3px solid var(--accent); margin-bottom: 12px; max-width: 760px; }
h1 { font-size: clamp(1.7rem, 4.8vw, 2.5rem); line-height: 1.1; margin: 0 0 6px; letter-spacing: -0.025em; font-weight: 800; }
.lede { margin: 0 0 6px; color: var(--muted); max-width: 64ch; }
h2 { font-size: 1.25rem; line-height: 1.25; margin: 0 0 10px; letter-spacing: -0.01em; }

/* setup */
.setup { display: flex; flex-wrap: wrap; align-items: flex-start; gap: 10px 12px; margin: 0 0 12px; }
.seg { display: inline-flex; border: 1.5px solid var(--line); border-radius: var(--r); overflow: hidden; background: var(--panel); }
.seg button { font: inherit; font-size: 0.95rem; min-height: 44px; padding: 6px 14px; border: 0; background: transparent; color: var(--ink); cursor: pointer; }
.seg button + button { border-left: 1.5px solid var(--line); }
.seg button[aria-pressed="true"] { background: var(--ink); color: var(--panel); font-weight: 600; }
.qdrop { position: relative; }
.qdrop summary { list-style: none; cursor: pointer; min-height: 44px; display: flex; align-items: center; gap: 0.3em; padding: 6px 14px; border: 1.5px solid var(--line); border-radius: var(--r); background: var(--panel); font-size: 0.95rem; }
.qdrop summary::-webkit-details-marker { display: none; }
.qdrop summary::after { content: ""; width: 7px; height: 7px; border: solid var(--muted); border-width: 0 2px 2px 0; transform: rotate(45deg); margin: -3px 0 0 10px; }
.qdrop[open] summary::after { transform: rotate(-135deg); margin-top: 4px; }
.qdrop fieldset { border: 0; margin: 0; padding: 0; min-width: 0; }
.qpick { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 0 12px; padding: 10px 12px; margin-top: 6px; border: 1.5px solid var(--line); border-radius: var(--r); background: var(--panel); }
@media (min-width: 700px) { .qdrop[open] .qpick { position: absolute; z-index: 5; width: 480px; box-shadow: 0 6px 20px rgb(0 0 0 / 0.15); } }
.qc { display: flex; align-items: center; gap: 8px; min-height: 40px; cursor: pointer; }
.qc input { width: 20px; height: 20px; margin: 0; accent-color: var(--accent); }

.btn { font: inherit; font-size: 0.95rem; min-height: 44px; padding: 6px 16px; border: 1.5px solid var(--ink); border-radius: var(--r); background: var(--panel); color: var(--ink); cursor: pointer; font-weight: 600; }
.btn:hover { background: var(--bg); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.primary:hover { filter: brightness(1.08); }
.btn.small { min-height: 44px; padding: 4px 12px; font-size: 0.9rem; }
.link { font: inherit; font-size: 0.95rem; background: none; border: 0; padding: 8px 4px; min-height: 44px; color: var(--accent); text-decoration: underline; text-underline-offset: 2px; cursor: pointer; }
select, input { font: inherit; font-size: 16px; color: var(--ink); background: var(--panel); border: 1.5px solid var(--line); border-radius: var(--r); min-height: 44px; padding: 6px 10px; max-width: 100%; }

.note { margin: 0 0 12px; padding: 10px 12px; border-left: 4px solid var(--water); background: var(--panel); }
.note.warn { border-left-color: var(--bad); }

/* map and questions */
.work { display: grid; gap: 16px; outline: none; }
.mapbox { margin: 0 -6px; background: var(--panel); border: 1.5px solid var(--line); border-radius: var(--r); padding: 6px; min-width: 0; }
@media (min-width: 600px) { .mapbox { margin: 0; padding: 10px; } }
.maphead { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 6px; }
.maphead h2 { margin: 0; font-size: 1.05rem; }
.code { font-variant-numeric: tabular-nums; letter-spacing: 0.06em; }
.mapview { overflow: hidden; }
.mapview svg { display: block; width: 100%; height: auto; }
.mapbox.zoomed .mapview { overflow-x: auto; }
.mapbox.zoomed .mapview svg { width: 200%; max-width: none; }
@media (min-width: 900px) { #zoom { display: none; } .mapbox.zoomed .mapview svg { width: 100%; } }
@media (min-width: 1060px) {
  .work { grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr); align-items: start; }
  .mapbox { position: sticky; top: 10px; }
}
/* phones and tablets: the map scrolls away above the questions, so one tap brings it back and a second returns */
.mapjump { position: fixed; right: 12px; bottom: calc(12px + env(safe-area-inset-bottom, 0px)); z-index: 15; min-height: 44px; padding: 0 18px;
  border: 0; border-radius: 22px; background: var(--ink); color: var(--panel); font: inherit; font-size: 1rem; font-weight: 600; cursor: pointer;
  box-shadow: 0 2px 10px rgb(0 0 0 / 0.25); }
@media (min-width: 1060px) { .mapjump { display: none; } }

/* the map's own symbols (screen); print overrides below */
svg .paper { fill: var(--map-paper); }
svg .ct { fill: none; stroke: var(--contour); stroke-width: 0.2; stroke-linejoin: round; }
svg .ci { fill: none; stroke: var(--contour-index); stroke-width: 0.48; stroke-linejoin: round; }
svg .hc { fill: none; stroke: var(--contour); stroke-width: 0.2; }
svg .st { fill: none; stroke: #1c64a8; stroke-width: 0.55; stroke-linejoin: round; stroke-linecap: round; }
svg .stc { display: none; }
svg text { font-family: var(--sans); }
svg .cl { font-size: 2.4px; fill: var(--contour-index); paint-order: stroke; stroke: var(--map-paper); stroke-width: 0.8px; stroke-linejoin: round; }
svg .sl { font-size: 2.5px; font-style: italic; fill: #1c64a8; paint-order: stroke; stroke: var(--map-paper); stroke-width: 0.7px; }
svg .lt { font-size: 3.4px; font-weight: 700; fill: var(--map-ink); paint-order: stroke; stroke: var(--map-paper); stroke-width: 0.8px; stroke-linejoin: round; }
svg .pt, svg .xyend { fill: var(--map-ink); }
svg .xy { stroke: var(--map-ink); stroke-width: 0.25; }
svg .bm { stroke: var(--map-ink); stroke-width: 0.3; fill: none; }
svg .bmt { font-size: 2.4px; fill: var(--map-ink); paint-order: stroke; stroke: var(--map-paper); stroke-width: 0.7px; }
svg .frame { fill: none; stroke: var(--map-ink); stroke-width: 0.35; }
svg .sb-b { fill: var(--ink); }
svg .sb-w { fill: var(--panel); stroke: var(--ink); stroke-width: 0.2; }
svg .tick, svg .na { stroke: var(--ink); stroke-width: 0.25; }
svg .nh { fill: var(--ink); }
svg .st-t { font-size: 2.3px; fill: var(--ink); }
svg .st-s { font-size: 2px; fill: var(--muted); }
svg .st-n { font-size: 2.8px; font-weight: 700; fill: var(--ink); }
svg.prof .grid { fill: none; stroke: var(--line); stroke-width: 0.12; }
svg.prof .gframe { fill: none; stroke: var(--ink); stroke-width: 0.25; }
svg.prof .gl, svg.prof .gt { font-size: 2.5px; fill: var(--ink); }
svg.prof .lt { fill: var(--ink); stroke: none; }
svg.prof .pl { fill: none; stroke: var(--accent); stroke-width: 0.4; stroke-linejoin: round; }
svg.prof .pd { fill: var(--accent); }

.qs { min-width: 0; }
.qs-head { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; flex-wrap: wrap; }
.score { margin: 0; color: var(--muted); font-size: 0.95rem; }
.qlist { list-style: none; margin: 0; padding: 0; }
.q { padding: 12px 0 14px; border-top: 1.5px solid var(--line); }
.qt { margin: 0 0 8px; display: flex; gap: 10px; }
.num { flex: none; width: 1.7em; height: 1.7em; display: inline-grid; place-items: center; font-weight: 700; font-size: 0.9rem; border: 1.5px solid var(--ink); border-radius: 50%; margin-top: 1px; }
.is-right .num { background: var(--ok); border-color: var(--ok); color: var(--panel); }
.is-wrong .num { border-color: var(--bad); color: var(--bad); }
.is-close .num { border-color: var(--close); color: var(--close); }
.arow { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; padding-left: calc(1.7em + 10px); }
.ain { display: inline-flex; align-items: center; gap: 6px; }
.ain input { width: 8.5em; }
.unit { color: var(--muted); font-size: 0.95rem; }
.fbwrap { padding-left: calc(1.7em + 10px); }
.fb { margin: 8px 0 0; padding: 6px 10px; border-radius: var(--r); font-size: 0.95rem; }
.fb.right { background: var(--ok-soft); color: var(--ok); }
.fb.close { background: var(--close-soft); color: var(--close); }
.fb.wrong, .fb.unread { background: var(--bad-soft); color: var(--bad); }
.work details, .q details { margin-top: 6px; padding-left: calc(1.7em + 10px); }
.q summary { cursor: pointer; color: var(--accent); font-size: 0.95rem; min-height: 32px; padding: 4px 0; }
.ans { margin: 6px 0 4px; }
.steps { margin: 0; padding-left: 1.2em; font-size: 0.95rem; color: var(--muted); }
.steps li { margin: 2px 0; }
.prof-q .profwrap { margin: 4px 0 8px; background: var(--panel); }
.prof-q .profwrap svg { display: block; width: 100%; height: auto; }
.prof-q > .btn, .work-open { margin-left: calc(1.7em + 10px); }
.qs-foot { display: flex; gap: 8px 16px; align-items: center; flex-wrap: wrap; padding-top: 12px; border-top: 1.5px solid var(--line); }

/* share and print */
.share { margin: 22px 0 8px; padding: 14px 0; border-top: 3px solid var(--ink); }
.print-row { display: flex; flex-wrap: wrap; gap: 10px 12px; align-items: center; }
.print-row label { display: inline-flex; align-items: center; gap: 8px; font-weight: 600; }
.hint { color: var(--muted); font-size: 0.95rem; margin: 8px 0 0; }
.share-out label { display: flex; flex-direction: column; gap: 4px; font-weight: 600; }
.share-out input { width: 100%; }
.recent { margin-top: 12px; }
.recent summary { cursor: pointer; min-height: 44px; display: flex; align-items: center; font-weight: 600; }
.recent ul { list-style: none; margin: 0; padding: 0; }
.recent li { display: flex; justify-content: space-between; align-items: center; gap: 8px; border-top: 1px solid var(--line); padding: 4px 0; }
.recent small { display: block; color: var(--muted); }

/* content */
.content { max-width: 760px; margin: 18px 0 30px; }
.content h2 { margin-top: 26px; }
.content p { margin: 0 0 12px; }
.faq details { border-top: 1px solid var(--line); padding: 4px 0; }
.faq summary { cursor: pointer; font-weight: 600; min-height: 44px; display: flex; align-items: center; }
.faq p { margin: 4px 0 10px; }
.sources { font-size: 0.95rem; color: var(--muted); }

footer { border-top: 1.5px solid var(--line); padding: 16px 0 28px; font-size: 0.95rem; color: var(--muted); }
.indep { margin: 0 0 10px; }
.sb-footer p { margin: 0 0 8px; }
.sb-more a { color: var(--muted); }
.sb-credit a { color: var(--accent); }

.toast { position: fixed; left: 50%; bottom: 16px; transform: translate(-50%, 140%); max-width: min(92vw, 520px); background: var(--ink); color: var(--panel); padding: 10px 16px; border-radius: var(--r); font-size: 0.95rem; transition: transform 0.2s; z-index: 20; }
.toast.on { transform: translate(-50%, 0); }
@media (prefers-reduced-motion: reduce) { .toast { transition: none; } }

.print-root { display: none; }

@media print {
  @page { margin: 12mm; }
  body { background: #fff; color: #000; font: 10.5pt/1.4 var(--sans); }
  main, footer, .toast, .skip { display: none !important; }
  .print-root { display: block; }
  .print-root .pt { width: 100%; border-collapse: collapse; }
  .print-root .pt > thead td { font-size: 8.5pt; color: #444; padding: 0 0 2mm; text-align: right; }
  .psheet, .pkey { break-after: page; }
  .print-root > section:last-child { break-after: auto; }
  .ph { display: flex; justify-content: space-between; align-items: baseline; border-bottom: 1.5pt solid #000; margin-bottom: 2mm; }
  .ph h2 { font-size: 15pt; margin: 0; }
  .ph p { margin: 0; font-size: 10pt; }
  .pmeta { display: flex; justify-content: space-between; margin: 0 0 3mm; font-size: 10pt; }
  .pmap { margin: 0 auto 3mm; }
  .pmap svg, .pprof svg { display: block; width: 100%; height: auto; }
  .pq { margin: 0; padding-left: 6mm; column-count: 2; column-gap: 8mm; }
  .pq.one { column-count: 1; }
  .pq > li { break-inside: avoid; margin: 0 0 2.2mm; font-size: 10pt; line-height: 1.3; }
  .blank { display: inline-block; vertical-align: baseline; height: 1em; border-bottom: 0.6pt solid #000; }
  .blank.w-s { width: 12mm; } .blank.w-m { width: 26mm; } .blank.w-fill { width: calc(100% - 20mm); } .blank.w-all { width: 100%; }
  .blank.w-name { width: 50mm; } .blank.w-date { width: 25mm; } .blank.w-score { width: 10mm; }
  .pprof-page { break-before: page; }
  .pkc { margin: 0 0 4mm; padding-left: 6mm; column-count: 2; column-gap: 8mm; }
  .pkc > li { break-inside: avoid; margin: 0 0 2mm; }
  .pkl { color: #333; }
  .pq p { margin: 0; }
  .pans { margin-top: 1.4mm !important; }
  .pprof { break-inside: avoid; margin-top: 4mm; }
  .pcap { margin: 0 0 1mm; font-weight: 700; font-size: 10pt; }
  .pk { margin: 0; padding-left: 6mm; }
  .pk > li { break-inside: avoid; margin-bottom: 3mm; }
  .pkq { margin: 0; color: #333; }
  .pka { margin: 0.5mm 0; font-weight: 700; }
  .pks { margin: 0; padding-left: 5mm; font-size: 9.5pt; }
  /* black and white: the map prints in ink only */
  svg .paper { fill: #fff; }
  svg .ct, svg .hc { stroke: #000; stroke-width: 0.17; }
  svg .ci { stroke: #000; stroke-width: 0.42; }
  svg .stc { display: inline; fill: none; stroke: #000; stroke-width: 1.05; stroke-linejoin: round; }
  svg .st { stroke: #fff; stroke-width: 0.45; stroke-linecap: butt; }
  svg .cl, svg .bmt, svg .lt, svg .sl { fill: #000; stroke: #fff; }
  svg .sb-b, svg .nh, svg .pt, svg .xyend { fill: #000; }
  svg .sb-w { fill: #fff; stroke: #000; }
  svg .tick, svg .na, svg .xy, svg .bm, svg .frame { stroke: #000; }
  svg .st-t, svg .st-n, svg .st-s { fill: #000; }
  svg.prof .grid { stroke: #777; stroke-width: 0.1; }
  svg.prof .gframe { stroke: #000; }
  svg.prof .gl, svg.prof .gt, svg.prof .lt { fill: #000; }
  svg.prof .pl { stroke: #000; stroke-width: 0.4; }
  svg.prof .pd { fill: #000; }
}
a.btn { display: inline-flex; align-items: center; text-decoration: none; }