* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body { background: var(--bg); color: var(--ink); font: 14px/1.45 var(--sans); display: flex; flex-direction: column; }
header { display: flex; flex-wrap: wrap; gap: 8px 16px; align-items: center; justify-content: space-between; padding: 10px 16px; border-bottom: 1px solid var(--line); background: var(--panel); }
.brand { font: 600 17px var(--mono); letter-spacing: -0.02em; }
.brand .logo { color: var(--accent); }
.brand .sub { font: 400 12px var(--sans); color: var(--muted); margin-left: 8px; }
.toolbar { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.toolbar .sep { width: 1px; height: 20px; background: var(--line); margin: 0 4px; }
button, select, a.btn { font: 500 13px var(--sans); color: var(--ink); background: var(--panel); border: 1px solid var(--line); border-radius: 6px; padding: 5px 10px; cursor: pointer; }
button:hover, select:hover, a.btn:hover { border-color: var(--axis); }
#btn-run { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
button.running { background: var(--err); color: #fff; border-color: var(--err); }
main { flex: 1; display: grid; grid-template-columns: minmax(360px, 44%) 1fr; min-height: 0; }
.left { display: flex; flex-direction: column; border-right: 1px solid var(--line); min-height: 0; overflow: auto; }
.right { overflow: auto; padding: 12px 16px 24px; display: flex; flex-direction: column; gap: 14px; }
.editor-wrap { display: flex; flex: 1 0 340px; min-height: 340px; background: var(--code-bg); border-bottom: 1px solid var(--line); position: relative; }
.gutter { margin: 0; padding: 10px 6px 10px 10px; text-align: right; color: var(--axis); font: 12.5px/1.55 var(--mono); user-select: none; overflow: hidden; min-width: 38px; }
.gutter .err { color: var(--err); font-weight: 600; }
#editor { flex: 1; resize: none; border: 0; outline: 0; background: transparent; color: var(--ink); font: 12.5px/1.55 var(--mono); padding: 10px 12px 10px 4px; white-space: pre; overflow: auto; tab-size: 2; }
#editor::selection { background: var(--sel); }
.status { font: 12px var(--mono); padding: 6px 12px; min-height: 28px; color: var(--muted); border-bottom: 1px solid var(--line); white-space: pre-wrap; }
.status.err { color: var(--err); }
.status.ok { color: var(--ok); }
.panel { padding: 10px 12px; border-bottom: 1px solid var(--line); }
.panel:empty { display: none; }
.panel h3 { margin: 0 0 8px; font: 600 12px var(--sans); text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); display: flex; justify-content: space-between; align-items: center; }
.panel h3 button { text-transform: none; letter-spacing: 0; font-size: 12px; padding: 2px 8px; }
.slider { display: grid; grid-template-columns: 70px 1fr 82px; gap: 8px; align-items: center; font: 12px var(--mono); margin: 4px 0; }
.slider input[type=range] { width: 100%; accent-color: var(--accent); }
.slider .val { text-align: right; }
.slider.changed .val { color: var(--accent); font-weight: 500; }
table.modes { border-collapse: collapse; font: 12px var(--mono); width: 100%; margin-bottom: 10px; }
table.modes th, table.modes td { text-align: right; padding: 2px 6px; border-bottom: 1px solid var(--grid); }
table.modes th { color: var(--muted); font-weight: 500; }
table.modes caption { text-align: left; font: 500 12px var(--mono); padding: 4px 0; }
.plot { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px 10px; }
.plot .ptitle { font: 500 12px var(--mono); color: var(--muted); display: flex; justify-content: space-between; gap: 8px; }
.plot canvas { width: 100%; height: 270px; display: block; cursor: crosshair; touch-action: none; }
.plot.smith canvas { height: 340px; }
.legend { display: flex; flex-wrap: wrap; gap: 4px 14px; font: 12px var(--mono); margin-top: 4px; }
.legend .sw { display: inline-block; width: 10px; height: 3px; vertical-align: middle; margin-right: 5px; border-radius: 2px; }
.legend .v { color: var(--muted); margin-left: 6px; }
dialog { max-width: min(860px, 94vw); max-height: 86vh; border: 1px solid var(--line); border-radius: 10px; background: var(--panel); color: var(--ink); padding: 18px 24px; }
dialog::backdrop { background: rgba(0,0,0,.35); }
dialog .close { position: sticky; top: 0; float: right; font-size: 18px; padding: 0 9px; }
#help-body h2 { font: 600 16px var(--sans); margin: 4px 0 10px; }
#help-body h4 { margin: 16px 0 4px; }
#help-body pre { background: var(--code-bg); padding: 8px 10px; border-radius: 6px; font: 12px/1.5 var(--mono); overflow-x: auto; border: 1px solid var(--grid); }
#help-body code { font: 12px var(--mono); }
@media (max-width: 820px) {
  main { grid-template-columns: 1fr; }
  .left { border-right: 0; }
  .editor-wrap { flex-basis: 300px; }
  header { padding: 10px 16px; }
}

#synth { width: min(760px, 94vw); }
#synth h2 { font: 600 16px var(--sans); margin: 0 0 12px; }
#synth .grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 10px 16px; }
#synth label > span { color: var(--muted); }
#synth label { display: flex; flex-direction: column; gap: 3px; font: 500 12px var(--sans); color: var(--muted); }
#synth label small { font-weight: 400; font-size: 11px; }
#synth label.check { flex-direction: row; align-items: center; gap: 8px; margin-top: 10px; color: var(--ink); }
#synth input:not([type=checkbox]), #synth select { font: 13px var(--mono); color: var(--ink); background: var(--code-bg); border: 1px solid var(--line); border-radius: 6px; padding: 5px 8px; }
#synth .actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 12px; }
#synth .primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
#synth .status { border: 0; padding: 6px 0 0; }
#synth.hide-comb .comb-only { display: none; }
#synth.hide-capopt .cap-opt { display: none; }

a.btn { text-decoration: none; display: inline-block; }
.notice { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; padding: 6px 12px; font-size: 13px; background: var(--sel); border-bottom: 1px solid var(--line); }
.notice[hidden] { display: none; }
.notice span { flex: 1; }
.notice button { padding: 2px 8px; font-size: 12px; }
.left > .status, .left > .panel, .left > .notice { flex-shrink: 0; }   /* never squash these under the editor */
table.modes.sub th { text-align: left; font-weight: 500; padding-right: 12px; white-space: nowrap; }
table.modes.sub td { text-align: left; }
.sub-notes { font-size: 12px; color: var(--muted); margin: -4px 0 12px; }
.sub-notes summary { cursor: pointer; }
.sub-notes ul { margin: 4px 0 6px; padding-left: 18px; }
.sub-notes .label { margin: 6px 0 0; font-weight: 500; }
.panel h3 + h3, .panel details + h3 { margin-top: 14px; }
.sub-notes a { color: var(--accent); }
table.modes caption .geo { font-weight: 400; color: var(--muted); }
.plots { display: flex; flex-direction: column; gap: 14px; }
#layout-card:empty { display: none; }
.layout-card .ptitle { display: flex; justify-content: space-between; align-items: center; gap: 8px; flex-wrap: wrap; }
.layout-card .ptitle button { font-size: 12px; padding: 2px 8px; }
.layout-card .svgbox { margin-top: 6px; background: #12151a; border-radius: 6px; padding: 6px; }
.layout-card .svgbox svg { width: 100%; height: auto; display: block; max-height: 420px; }
.layout-card .drc { font: 12px var(--mono); margin: 6px 0 0; padding-left: 18px; }
.layout-card .drc.ok { color: var(--ok); list-style: none; padding-left: 0; }
.layout-card .drc.bad { color: var(--err); }
.layout-card .lnotes { font-size: 12px; color: var(--muted); margin: 4px 0 0; padding-left: 18px; }
.layout-card .drc.warn { color: var(--warn, #b7791f); list-style: none; padding-left: 0; }
.layout-ctl { display: flex; flex-wrap: wrap; gap: 6px 12px; align-items: flex-end; margin: 8px 0 2px; font-size: 12px; }
.layout-ctl label { display: flex; flex-direction: column; gap: 2px; color: var(--muted); }
.layout-ctl label.check { flex-direction: row; align-items: center; gap: 6px; color: var(--ink); padding-bottom: 4px; }
.layout-ctl select, .layout-ctl input[type=number] { font: 12px var(--mono); color: var(--ink); background: var(--code-bg); border: 1px solid var(--line); border-radius: 6px; padding: 3px 6px; }
.layout-ctl input[type=number] { width: 6.5em; }
.layout-ctl select { max-width: 17em; }
.layout-card button.primary, .layout-ctl button.primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.legend .sw.dash { background: none !important; height: 0; border-top: 2px dashed; width: 14px; }
.legend .sw.dot { border-top-style: dotted; width: 16px; }