:root {
  --bg: #0b0e13;
  --panel: #141921;
  --panel-2: #1b2029;
  --line: #2a323f;
  --ink: #dfe6f0;
  --dim: #8794a8;
  --accent: #00c2ff;
  --warn: #ffb84d;
  --ok: #7fffa8;
  --radius: 6px;
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  font: 13px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg); color: var(--ink);
  display: flex; flex-direction: column; overflow: hidden;
}

/* ── top bar ─────────────────────────────────────────────────────────── */
.topbar {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 12px; background: var(--panel); border-bottom: 1px solid var(--line);
  flex: 0 0 auto;
}
.brand { display: flex; align-items: center; gap: 8px; font-weight: 600; letter-spacing: .02em; margin-right: 6px; }
.mark {
  width: 16px; height: 16px; border-radius: 50% 50% 46% 46% / 60% 60% 40% 40%;
  border: 2px solid var(--accent); border-top-color: transparent;
}
.spacer { flex: 1; }
.tools { display: flex; gap: 2px; background: var(--panel-2); padding: 2px; border-radius: var(--radius); }
.tool {
  background: none; border: 0; color: var(--dim); font: inherit;
  padding: 5px 10px; border-radius: 4px; cursor: pointer;
}
.tool:hover { color: var(--ink); }
.tool.on { background: var(--accent); color: #04202b; font-weight: 600; }
.btn {
  background: var(--panel-2); border: 1px solid var(--line); color: var(--ink);
  font: inherit; padding: 5px 11px; border-radius: var(--radius); cursor: pointer;
}
.btn:hover { border-color: var(--accent); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #04202b; font-weight: 600; }
.btn.primary:hover { filter: brightness(1.1); }
.btn.tiny { padding: 2px 7px; font-size: 11px; }
.btn.danger:hover { border-color: #e8483f; color: #ff7f77; }

/* ── layout ──────────────────────────────────────────────────────────── */
main { flex: 1; display: flex; min-height: 0; }
.stage { flex: 1; position: relative; min-width: 0; }
#canvas { width: 100%; height: 100%; display: block; cursor: grab; }
#canvas.tracing { cursor: crosshair; }
#canvas.panning { cursor: grabbing; }

.dropzone {
  position: absolute; inset: 0; display: grid; place-items: center; text-align: center;
  color: var(--dim); pointer-events: none; padding: 40px;
}
.dropzone strong { display: block; font-size: 16px; color: var(--ink); margin-bottom: 6px; }
.dropzone.hide { display: none; }
.stage.dragover .dropzone { background: rgba(0,194,255,.08); outline: 2px dashed var(--accent); outline-offset: -12px; }

.readout, .hint {
  position: absolute; bottom: 10px; padding: 5px 9px;
  background: rgba(11,14,19,.85); border: 1px solid var(--line); border-radius: var(--radius);
  font: 12px/1.4 ui-monospace, Menlo, monospace; pointer-events: none; white-space: pre;
}
.readout { left: 10px; }
.hint { right: 10px; font-family: inherit; color: var(--warn); max-width: 46ch; white-space: normal; }
.hint:empty { display: none; }

/* ── side panel ──────────────────────────────────────────────────────── */
.panel {
  flex: 0 0 372px; background: var(--panel); border-left: 1px solid var(--line);
  display: flex; flex-direction: column; min-height: 0;
}
.tabs { display: flex; border-bottom: 1px solid var(--line); flex: 0 0 auto; }
.tabs button {
  flex: 1; background: none; border: 0; border-bottom: 2px solid transparent;
  color: var(--dim); font: inherit; padding: 9px 4px; cursor: pointer;
}
.tabs button:hover { color: var(--ink); }
.tabs button.on { color: var(--accent); border-bottom-color: var(--accent); }
.tab { padding: 14px; overflow-y: auto; flex: 1; }

h3 { font-size: 12px; text-transform: uppercase; letter-spacing: .07em; color: var(--dim);
     margin: 20px 0 8px; font-weight: 600; }
.tab > h3:first-child { margin-top: 0; }
.note { color: var(--dim); font-size: 12px; margin: 6px 0; }
.note code { background: var(--panel-2); padding: 1px 4px; border-radius: 3px; color: var(--ink); }
.keys { padding-left: 16px; margin: 4px 0; }
.keys li { margin: 3px 0; }
.group { background: var(--panel-2); border: 1px solid var(--line); border-radius: var(--radius);
         padding: 10px; display: flex; flex-direction: column; gap: 8px; margin-bottom: 10px; }
.group.row, .field.row { flex-direction: row; align-items: center; gap: 8px; }
.field { display: flex; flex-direction: column; gap: 4px; }
.field > span, .field label > span { color: var(--dim); font-size: 11px;
  text-transform: uppercase; letter-spacing: .05em; }
.field.row > span { flex: 0 0 auto; text-transform: none; letter-spacing: 0; font-size: 12px; }
.field.row label { display: flex; flex-direction: column; gap: 4px; flex: 1; }
input[type=text], input[type=number], select, textarea {
  background: var(--bg); border: 1px solid var(--line); color: var(--ink);
  font: inherit; padding: 5px 7px; border-radius: 4px; width: 100%;
}
textarea { font: 12px/1.5 ui-monospace, Menlo, monospace; resize: vertical; }
input:focus, select:focus, textarea:focus { outline: 1px solid var(--accent); border-color: var(--accent); }
input[type=range] { flex: 1; accent-color: var(--accent); }
output { font: 12px ui-monospace, Menlo, monospace; color: var(--dim); min-width: 4ch; text-align: right; }
.check { display: flex; align-items: center; gap: 7px; color: var(--ink); cursor: pointer; }
.check input { accent-color: var(--accent); }

/* ── view / curve cards ──────────────────────────────────────────────── */
.card { border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel-2);
        padding: 10px; margin-bottom: 8px; }
.card.on { border-color: var(--accent); }
.card-head { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; }
.card-head b { flex: 1; font-weight: 600; }
.badge { font: 11px ui-monospace, Menlo, monospace; padding: 1px 6px; border-radius: 3px;
         background: var(--bg); border: 1px solid var(--line); color: var(--dim); }
.badge.ok { color: var(--ok); border-color: rgba(127,255,168,.4); }
.badge.warn { color: var(--warn); border-color: rgba(255,184,77,.4); }
.steps { display: flex; flex-direction: column; gap: 6px; }
.step { display: flex; align-items: center; gap: 7px; }
.step .btn { flex: 0 0 auto; }
.step input[type=text] { flex: 1; }
.step .lbl { flex: 0 0 74px; color: var(--dim); font-size: 12px; }
.swatch { width: 13px; height: 13px; border-radius: 3px; flex: 0 0 auto; border: 1px solid rgba(0,0,0,.4); }
.curve-row { display: flex; align-items: center; gap: 7px; padding: 6px 8px; border-radius: 4px;
             border: 1px solid var(--line); background: var(--panel-2); margin-bottom: 5px; cursor: pointer; }
.curve-row.on { border-color: var(--accent); background: rgba(0,194,255,.09); }
.curve-row .nm { flex: 1; background: none; border: 0; color: var(--ink); font: inherit; padding: 2px; min-width: 0; }
.curve-row .nm:focus { background: var(--bg); border-radius: 3px; }
.curve-row .ct { font: 11px ui-monospace, Menlo, monospace; color: var(--dim); }
.curve-row .badge { font-size: 10px; padding: 1px 5px; flex: 0 0 auto; }
.curve-row .badge:not(.ok):not(.warn) { opacity: .7; }

/* ── table ───────────────────────────────────────────────────────────── */
.tablewrap { overflow-x: auto; }
table { border-collapse: collapse; width: 100%; font: 12px ui-monospace, Menlo, monospace; }
caption { text-align: left; color: var(--dim); font: 600 11px/1 -apple-system, sans-serif;
          text-transform: uppercase; letter-spacing: .07em; padding: 14px 0 6px; }
th, td { border: 1px solid var(--line); padding: 3px 7px; text-align: right; white-space: nowrap; }
th { background: var(--panel-2); color: var(--dim); font-weight: 600; position: sticky; top: 0; }
td:first-child, th:first-child { text-align: left; }
tbody tr:hover td { background: rgba(0,194,255,.06); }
td.amb { color: var(--warn); }
td.extrap { color: #9fb4d8; font-style: italic; }
td.miss { color: #5a6577; }
.warn-box { border: 1px solid rgba(255,184,77,.35); background: rgba(255,184,77,.08);
            color: var(--warn); border-radius: var(--radius); padding: 8px 10px; margin-bottom: 10px; font-size: 12px; }
.warn-box ul { margin: 4px 0 0; padding-left: 18px; }
.empty { color: var(--dim); text-align: center; padding: 30px 10px; }

/* A required field the user has not filled in yet. */
input.needs { border-color: var(--warn); background: rgba(255,184,77,.07); }
input.needs::placeholder { color: var(--warn); opacity: .75; }
.callout { border: 1px solid rgba(255,184,77,.35); background: rgba(255,184,77,.08);
           color: var(--warn); border-radius: 4px; padding: 7px 9px; font-size: 12px; }

/* Body-plan preview on the CAD tab. */
#body-plan, #panel-preview { width: 100%; height: 260px; display: block; background: var(--bg);
             border: 1px solid var(--line); border-radius: var(--radius); margin-bottom: 8px; }
#panel-preview { height: 190px; }
#assembly-preview { height: 200px; }

/* Parts picker on the CAD tab. */
.group.wrap { flex-wrap: wrap; }
.part-row { display: flex; align-items: center; gap: 8px; padding: 5px 8px; border-radius: 4px;
            border: 1px solid var(--line); background: var(--panel-2); margin-bottom: 4px; }
.part-row .nm { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.part-row .dim { font: 11px ui-monospace, Menlo, monospace; color: var(--dim); white-space: nowrap; }
.part-row.off { opacity: .45; }
.part-group { font-size: 11px; text-transform: uppercase; letter-spacing: .06em;
              color: var(--dim); margin: 10px 0 5px; }
.part-group:first-child { margin-top: 0; }

/* Guide checklist. */
.gstep { display: flex; gap: 9px; padding: 8px 9px; border: 1px solid var(--line);
        border-radius: var(--radius); background: var(--panel-2); margin-bottom: 6px; cursor: pointer; }
.gstep:hover { border-color: var(--accent); }
.gstep.next { border-color: var(--accent); background: rgba(0,194,255,.07); }
.gstep .dot { flex: 0 0 17px; height: 17px; border-radius: 50%; margin-top: 1px;
             display: grid; place-items: center; font-size: 10px; font-weight: 700;
             background: var(--bg); border: 1px solid var(--line); color: var(--dim); }
.gstep .dot.done { background: rgba(127,255,168,.15); border-color: var(--ok); color: var(--ok); }
.gstep .dot.todo { border-color: var(--dim); }
.gstep .dot.partial { background: rgba(255,184,77,.15); border-color: var(--warn); color: var(--warn); }
.gstep .dot.warn { background: rgba(255,184,77,.15); border-color: var(--warn); color: var(--warn); }
.gstep .body { flex: 1; min-width: 0; }
.gstep .t { font-weight: 600; }
.gstep .d { color: var(--dim); font-size: 12px; margin-top: 2px; }
.gstep ul { margin: 6px 0 0; padding-left: 0; list-style: none; }
.gstep li { display: flex; gap: 6px; font-size: 12px; padding: 2px 0; color: var(--dim); }
.gstep li .mark { flex: 0 0 12px; }
.gstep li.done .mark { color: var(--ok); }
.gstep li.todo .mark { color: var(--warn); }
.gstep li.warn { color: var(--warn); }
.gstep li b { color: var(--ink); font-weight: 600; }
.progress { display: flex; align-items: center; gap: 9px; margin-bottom: 12px; }
.progress .bar { flex: 1; height: 5px; border-radius: 3px; background: var(--panel-2); overflow: hidden; }
.progress .bar i { display: block; height: 100%; background: var(--accent); }
.progress .n { font: 12px ui-monospace, Menlo, monospace; color: var(--dim); }

/* Settings for whichever curve is selected. */
#curve-detail:empty { display: none; }
#curve-detail { border: 1px solid var(--accent); border-radius: var(--radius);
                background: rgba(0,194,255,.06); padding: 10px; margin: 8px 0 4px; }
#curve-detail .hd { font-weight: 600; margin-bottom: 6px; display: flex; gap: 7px; align-items: center; }

/* Thumbnails of the individual parts. */
#parts-preview { display: grid; grid-template-columns: repeat(auto-fill, minmax(96px, 1fr));
                 gap: 7px; margin: 8px 0 4px; }
#parts-preview:empty { display: none; }
.thumb { border: 1px solid var(--line); border-radius: 4px; background: var(--bg); padding: 4px; }
.thumb.off { opacity: .35; }
.thumb canvas { width: 100%; height: 64px; display: block; }
.thumb .cap { font: 10px ui-monospace, Menlo, monospace; color: var(--dim);
              margin-top: 3px; text-align: center; overflow: hidden; text-overflow: ellipsis;
              white-space: nowrap; }
.thumb .cap b { color: var(--ink); font-weight: 600; }


/* ── the scale sweep ───────────────────────────────────────────────── */
#sweep-chart { width: 100%; height: 190px; display: block; margin: 12px 0 6px; }
#sweep-out table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
#sweep-out th { text-align: right; font-weight: 500; opacity: .7; padding: 4px 8px; }
#sweep-out th:first-child, #sweep-out td:first-child { text-align: left; }
#sweep-out td { text-align: right; padding: 3px 8px; border-top: 1px solid var(--line, #2a3140); }
#sweep-out tr.pick { cursor: pointer; }
#sweep-out tr.pick:hover td { background: rgba(0, 194, 255, .09); }
#sweep-out tr.front td { color: #7fe0a0; }
#sweep-out tr.now td { background: rgba(0, 194, 255, .13); }
#sweep-out tr.bad td { opacity: .5; }
#sweep-out .why { font-size: 11px; opacity: .75; }