:root {
  --bg: #15171a;
  --panel: #1c1f23;
  --panel-2: #23272c;
  --line: #2f343a;
  --text: #e6e3dc;
  --muted: #9a9c9e;
  --accent: #f2a33a;
  --accent-2: #ffd28a;
  --bad: #ef6b5b;
  --good: #7cc68a;
  --mono: ui-monospace, "JetBrains Mono", "Fira Code", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Inter, Roboto, sans-serif;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font: 14px/1.45 var(--sans);
  display: grid;
  grid-template-columns: 340px 1fr;
  overflow: hidden;
}
a { color: var(--accent-2); }

#panel {
  background: var(--panel);
  border-right: 1px solid var(--line);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}
#panel header { padding: 18px 20px 12px; border-bottom: 1px solid var(--line); }
h1 { margin: 0; font: 700 22px/1 var(--mono); letter-spacing: 0.02em; color: var(--accent); }
.tag { margin: 6px 0 0; color: var(--muted); font-size: 12.5px; }

form { padding: 4px 0 8px; flex: 1; }
fieldset { border: 0; border-bottom: 1px solid var(--line); margin: 0; padding: 12px 20px 14px; }
legend { float: left; width: 100%; padding: 0; margin-bottom: 8px; }
.section-toggle {
  all: unset; box-sizing: border-box; width: 100%; display: flex; align-items: center; gap: 8px; cursor: pointer;
  font: 600 11px/1 var(--mono); text-transform: uppercase; letter-spacing: 0.12em; color: var(--muted); padding: 2px 0;
}
.section-toggle:hover { color: var(--text); }
.section-toggle:focus-visible { outline: 1px solid var(--accent); outline-offset: 3px; border-radius: 3px; }
.chev { width: 7px; height: 7px; border-right: 1.5px solid currentColor; border-bottom: 1.5px solid currentColor; transform: rotate(45deg) translate(-2px, -2px); transition: transform .15s; }
fieldset.collapsed .chev { transform: rotate(-45deg); }
fieldset.collapsed legend { margin-bottom: 0; }
fieldset.collapsed > :not(legend) { display: none; }

.row { clear: both; display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 4px 10px; padding: 5px 0; }
.row[hidden] { display: none; }
.row label { color: var(--text); font-size: 13px; }
.row .help { grid-column: 1 / -1; color: var(--muted); font-size: 11.5px; line-height: 1.35; margin-top: -2px; }
.row input[type=range] { grid-column: 1 / -1; width: 100%; accent-color: var(--accent); margin: 2px 0 0; }

.num { display: flex; align-items: center; gap: 4px; }
.num input {
  width: 68px; background: var(--panel-2); color: var(--text); border: 1px solid var(--line); border-radius: 5px;
  padding: 3px 6px; font: 13px var(--mono); text-align: right;
}
.num input:focus, select:focus { outline: 1px solid var(--accent); border-color: var(--accent); }
.num .unit { color: var(--muted); font: 12px var(--mono); min-width: 1.6em; }

select {
  background: var(--panel-2); color: var(--text); border: 1px solid var(--line); border-radius: 5px;
  padding: 3px 6px; font: 13px var(--sans);
}

.switch { position: relative; width: 34px; height: 18px; }
.switch input { opacity: 0; width: 100%; height: 100%; margin: 0; position: absolute; cursor: pointer; z-index: 1; }
.switch span { position: absolute; inset: 0; background: var(--panel-2); border: 1px solid var(--line); border-radius: 9px; transition: .15s; }
.switch span::after { content: ""; position: absolute; top: 2px; left: 2px; width: 12px; height: 12px; border-radius: 50%; background: var(--muted); transition: .15s; }
.switch input:checked + span { background: color-mix(in srgb, var(--accent) 35%, var(--panel-2)); border-color: var(--accent); }
.switch input:checked + span::after { left: 18px; background: var(--accent-2); }
.switch input:focus-visible + span { outline: 1px solid var(--accent); }

#panel footer { padding: 14px 20px 20px; color: var(--muted); font-size: 11.5px; }
#panel footer p { margin: 0 0 6px; }

#stage { position: relative; min-width: 0; min-height: 0; }
#view { width: 100%; height: 100%; display: block; }

#hud { position: absolute; top: 14px; left: 16px; right: 16px; display: flex; justify-content: space-between; gap: 12px; pointer-events: none; }
#status, #dims {
  background: color-mix(in srgb, var(--panel) 88%, transparent); border: 1px solid var(--line); border-radius: 7px;
  padding: 6px 10px; font: 12.5px var(--mono);
}
#status { display: flex; align-items: center; gap: 8px; }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--muted); }
#status.busy .dot { background: var(--accent); animation: pulse 0.9s infinite alternate; }
#status.ok .dot { background: var(--good); }
#status.err .dot { background: var(--bad); }
#status.err { color: var(--bad); }
@keyframes pulse { from { opacity: .35; } to { opacity: 1; } }
#dims:empty { display: none; }
#hud { flex-wrap: wrap; }
#pose { display: flex; align-items: center; gap: 10px; pointer-events: auto;
  background: color-mix(in srgb, var(--panel) 88%, transparent); border: 1px solid var(--accent); border-radius: 7px;
  padding: 4px 4px 4px 10px; font: 12.5px var(--mono); color: var(--accent-2); margin-right: auto; }
#pose[hidden] { display: none; }
#pose button { padding: 3px 9px; font-size: 12px; }
#tip { position: absolute; left: 16px; bottom: 22px; color: var(--muted); font: 12px var(--mono); pointer-events: none; }

/* hole layout editor */
.hole-editor { margin-top: 10px; }
.hole-editor.disabled { opacity: .4; pointer-events: none; }
.he-bar { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 6px; font-size: 12.5px; }
.he-mirror { display: flex; align-items: center; gap: 6px; cursor: pointer; }
.he-mirror input { accent-color: var(--accent); margin: 0; }
.he-mode { color: var(--muted); font: 11px var(--mono); margin-left: auto; }
.he-reset { padding: 3px 8px; font-size: 11.5px; }
.he-reset[hidden] { display: none; }
.he-svg { width: 100%; max-height: 300px; display: block; background: var(--bg); border: 1px solid var(--line); border-radius: 7px; touch-action: none; user-select: none; }
.he-leaf { fill: color-mix(in srgb, var(--accent) 22%, var(--panel-2)); stroke: var(--accent); cursor: crosshair; }
.he-leaf.off { fill: var(--panel-2); stroke: var(--line); stroke-dasharray: 1 1; }
.he-knuckle { stroke: var(--bg); pointer-events: none; }
.he-knuckle.f { fill: var(--accent-2); }
.he-knuckle.m { fill: #b8741f; }
.he-gusset { fill: color-mix(in srgb, var(--accent-2) 35%, transparent); pointer-events: none; }
.he-axis { stroke: var(--bg); stroke-dasharray: 0.6 0.6; pointer-events: none; }
.he-hole { cursor: grab; }
.he-hole .head { fill: var(--panel); stroke: var(--accent-2); }
.he-hole .thru { fill: var(--bg); }
.he-hole .grab { fill: transparent; }
.he-hole:hover .head { stroke: #fff; fill: var(--panel-2); }
.he-hole.bad .head { stroke: var(--bad); fill: color-mix(in srgb, var(--bad) 25%, var(--panel)); }
.he-caption { display: flex; justify-content: space-between; color: var(--muted); font: 11px var(--mono); margin-top: 4px; }
.he-caption .he-count { color: var(--text); }
.hole-editor .help { color: var(--muted); font-size: 11.5px; line-height: 1.35; margin-top: 4px; }
#dims b { color: var(--accent-2); font-weight: 600; }

#actions { position: absolute; right: 16px; bottom: 16px; display: flex; gap: 8px; }
button {
  background: var(--panel-2); color: var(--text); border: 1px solid var(--line); border-radius: 7px;
  padding: 8px 14px; font: 600 13px var(--sans); cursor: pointer;
}
button:hover:not(:disabled) { border-color: var(--muted); }
button.primary { background: var(--accent); color: #1b1408; border-color: var(--accent); }
button.primary:hover:not(:disabled) { background: var(--accent-2); }
button:disabled { opacity: .45; cursor: default; }


@media (max-width: 760px) {
  body { grid-template-columns: 1fr; grid-template-rows: 55vh auto; overflow: auto; }
  #stage { grid-row: 1; height: 55vh; }
  #panel { grid-row: 2; border-right: 0; overflow: visible; }
  #tip { display: none; }
  #actions { left: 16px; justify-content: flex-end; flex-wrap: wrap; }
  #hud { flex-direction: column; align-items: flex-start; }
}