/* The same jeweller's bench as the Celtic Knot Designer: the work on a dark
   surface, tools laid out beside it */
:root {
  --bg: #e7ebe6;
  --panel: #f5f7f3;
  --fg: #1b231f;
  --muted: #59645d;
  --line: #c6cec6;
  --accent: #85601a;
  --accent-ink: #fffaf0;
  --canvas: #22342e;
  --focus: #b8862a;
  --warn: #c2413a;
  --font-display: "Uncial Antiqua", "Palatino Linotype", Palatino, serif;
  --font-body: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #111714; --panel: #19211d; --fg: #e3e8e1; --muted: #97a29a; --line: #2d3832;
    --accent: #d6aa4f; --accent-ink: #1a1408; --canvas: #16211d; --focus: #e9c46e; --warn: #e2716a; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #111714; --panel: #19211d; --fg: #e3e8e1; --muted: #97a29a; --line: #2d3832;
  --accent: #d6aa4f; --accent-ink: #1a1408; --canvas: #16211d; --focus: #e9c46e; --warn: #e2716a; color-scheme: dark;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { background: var(--bg); color: var(--fg); margin: 0; }
body { font: 15px/1.5 var(--font-body); }
.app { max-width: 1500px; margin: 0 auto; padding: 18px 20px 32px; display: grid; gap: 14px; }
header { display: grid; gap: 4px; }
h1 { font: 400 clamp(26px, 4vw, 38px)/1.1 var(--font-display); margin: 0; letter-spacing: .01em; }
header p { margin: 0; color: var(--muted); max-width: 75ch; }

.stage { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 14px; }
@media (max-width: 900px) { .stage { grid-template-columns: minmax(0, 1fr); } }
.canvas-wrap { background: var(--canvas); border-radius: 10px; position: relative; overflow: hidden; min-height: 320px; }
#knot { display: block; width: 100%; height: clamp(320px, 62vh, 760px); cursor: crosshair; touch-action: manipulation; }
#view3d { display: block; width: 100%; height: clamp(320px, 62vh, 760px); cursor: grab; touch-action: none; }
#view3d:active { cursor: grabbing; }
canvas:focus-visible { outline: 2px solid var(--focus); outline-offset: -2px; }
.overlay-msg { position: absolute; inset: 0; display: grid; place-items: center; margin: 0; padding: 24px; text-align: center; color: #e3e8e1; font-size: 14px; pointer-events: none; }
.bar { position: absolute; left: 10px; right: 10px; bottom: 8px; display: flex; flex-wrap: wrap; gap: 6px 12px; align-items: center; font-size: 12.5px; color: #c9d2cb; pointer-events: none; }
.bar span { margin-right: auto; text-shadow: 0 1px 2px #000a; }
.bar .btn { pointer-events: auto; padding: 4px 10px; font-size: 12.5px; }

.status { display: flex; flex-wrap: wrap; gap: 8px 10px; align-items: center; font-size: 13px; color: var(--muted); }
.chip { font: 500 12px/1 var(--font-mono); padding: 6px 9px; border-radius: 999px; border: 1px solid var(--line); color: var(--fg); font-variant-numeric: tabular-nums; }
.chip.good { border-color: var(--accent); color: var(--accent); }
.chip.warn { border-color: var(--warn); color: var(--warn); }
.history { margin-left: auto; display: flex; gap: 6px; }
.history .btn { padding: 5px 12px; }
.warnings { margin: 0; padding: 0; list-style: none; color: var(--warn); font-size: 13px; }

.controls { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 16px 18px;
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 18px 28px; align-items: start; }
fieldset { border: 0; padding: 0; margin: 0; display: grid; gap: 10px; min-width: 0; }
legend { font: 600 11px/1 var(--font-body); text-transform: uppercase; letter-spacing: .1em; color: var(--muted); padding: 0; margin-bottom: 10px; }
.row { display: grid; grid-template-columns: 1fr auto; gap: 2px 10px; align-items: center; }
.row label { font-size: 14px; }
.row output { font: 500 13px var(--font-mono); color: var(--muted); font-variant-numeric: tabular-nums; }
.row input[type=range] { grid-column: 1 / -1; width: 100%; accent-color: var(--accent); }
.seg { display: grid; grid-auto-flow: column; grid-auto-columns: 1fr; border: 1px solid var(--line); border-radius: 7px; overflow: hidden; }
.seg button { border: 0; background: transparent; color: var(--fg); font: 500 13px var(--font-body); padding: 8px 6px; cursor: pointer; }
.seg button + button { border-left: 1px solid var(--line); }
.seg button[aria-pressed="true"] { background: var(--accent); color: var(--accent-ink); }
.presets { display: grid; grid-template-columns: repeat(2, 1fr); gap: 6px; }
.samples { display: grid; grid-template-columns: repeat(auto-fill, minmax(92px, 1fr)); gap: 6px; }
.btn { border: 1px solid var(--line); background: var(--bg); color: var(--fg); font: 500 13px var(--font-body); padding: 8px 10px; border-radius: 7px; cursor: pointer; }
.btn:hover { border-color: var(--accent); }
.btn:disabled { opacity: .45; cursor: default; }
.btn.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
button:focus-visible, select:focus-visible, input:focus-visible, .drop:focus-within { outline: 2px solid var(--focus); outline-offset: 2px; }
select, .inline input[type=number] { width: 100%; min-width: 0; font: 14px var(--font-body); padding: 7px 8px; border-radius: 7px; border: 1px solid var(--line); background: var(--bg); color: var(--fg); }
.inline { display: grid; grid-template-columns: auto 1fr; gap: 10px; align-items: center; font-size: 14px; }
.check { display: flex; gap: 8px; align-items: center; font-size: 14px; }
.check input { accent-color: var(--accent); width: 16px; height: 16px; }
.seed-row { display: grid; grid-template-columns: auto 1fr auto auto; gap: 6px; align-items: center; font-size: 14px; }
.seed-row input { width: 100%; min-width: 0; font: 14px var(--font-mono); padding: 6px 8px; border-radius: 7px; border: 1px solid var(--line); background: var(--bg); color: var(--fg); }
.note { font-size: 12.5px; color: var(--muted); margin: 0; }
.note.warn { color: var(--warn); }
.drop { border: 1.5px dashed var(--line); border-radius: 9px; padding: 14px; text-align: center; display: grid; gap: 6px; cursor: pointer; }
.drop.over { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 10%, transparent); }
.drop strong { font-weight: 600; }
.exports { display: grid; gap: 6px; }
@media (prefers-reduced-motion: no-preference) { .btn, .seg button { transition: background .15s, border-color .15s; } }

/* the knot drawing: zoom bar, and full-screen editing */
.bar.top { top: 8px; bottom: auto; justify-content: flex-end; }
.bar.top .chip { margin-right: auto; background: #0008; color: #e3e8e1; border-color: #fff3; pointer-events: none; }
body:not(.editing) .edit-only, body.editing .not-edit { display: none; }
body.editing { overflow: hidden; }
body.editing .knot-wrap { position: fixed; inset: 0; z-index: 50; border-radius: 0; }
body.editing #knot { height: 100vh; height: 100dvh; }
.knot-wrap.panning #knot { cursor: grabbing; }
.carve-only { display: none; }
body.carved .carve-only { display: grid; }
body.carved .sweep-only { display: none; }
#carved-note { display: none; }
body.carved #carved-note { display: block; }
.note a { color: var(--accent); }