/* Loop shaping demo, in the Walenberg minimal style: white page, Helvetica, small spaced capitals */

:root {
  --ink: #111;
  --muted: #8a8a8a;
  --line: #e6e6e6;
  --soft: #f4f4f4;
  --accent: #2a6df4;
  --warn: #d2462f;
}

html, body {
  margin: 0;
  background: #fff;
  color: var(--ink);
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  -webkit-tap-highlight-color: transparent;
}

#wrapper {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 16px 64px;
}

header {
  padding: 32px 0 20px;
  text-align: center;
}

header h1 {
  margin: 12px 0 6px;
  font-weight: 400;
  font-size: clamp(18px, 4vw, 32px);
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.sub {
  margin: 0 auto;
  max-width: 640px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

.back-link {
  display: inline-block;
  padding: 12px 8px;
  color: var(--muted);
  text-decoration: none;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.back-link:hover, .back-link:focus-visible { color: var(--ink); outline: none; }

.label, .hint, .readout dt, .toggles, .readout-line {
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.nc { text-transform: none; }

/* ---------- layout ---------- */

.play {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 32px;
  align-items: start;
  margin-top: 12px;
}

.plots { min-width: 0; display: grid; gap: 20px; }

.pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.chart { min-width: 0; }

.chart-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 4px 16px;
  margin-bottom: 6px;
}

.hint { letter-spacing: 0.06em; text-transform: none; font-size: 11px; }

.readout-line { text-transform: none; letter-spacing: 0.04em; font-variant-numeric: tabular-nums; color: var(--ink); }

canvas {
  display: block;
  width: 100%;
  border: 1px solid var(--line);
  background: #fff;
}

#mag { height: 300px; touch-action: none; }
#phase { height: 210px; touch-action: none; }
#nyq, #step { height: 300px; }
#nyq { touch-action: none; cursor: grab; }

.toggles { display: flex; gap: 16px; }
.toggles label { cursor: pointer; display: inline-flex; align-items: center; gap: 4px; }
.toggles input { margin: 0 4px 0 0; accent-color: var(--ink); }

.sw {
  display: inline-block;
  width: 10px;
  height: 2px;
  margin: 0 3px 0 2px;
  vertical-align: middle;
}

.sw.dash { background: repeating-linear-gradient(90deg, #555 0 3px, transparent 3px 5px); }

.seg { display: inline-flex; border: 1px solid var(--line); }

.seg button, .add button, .reset {
  font: inherit;
  font-size: 10px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  background: #fff;
  border: 0;
  padding: 6px 10px;
  cursor: pointer;
}

.seg button.on { color: #fff; background: var(--ink); }

/* ---------- panel ---------- */

.panel { display: grid; gap: 28px; }

.group { display: grid; gap: 10px; }

.group > .label {
  display: flex;
  align-items: center;
  gap: 12px;
}

.group > .label::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
}

select, input[type="number"] {
  font: inherit;
  font-size: 13px;
  color: var(--ink);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 0;
  padding: 6px 8px;
}

select { width: 100%; }

input[type="number"] { width: 56px; font-variant-numeric: tabular-nums; }

select:focus, input:focus { outline: 1px solid var(--ink); outline-offset: -1px; }

.eq { margin: 0; font-size: 14px; font-style: italic; font-family: Georgia, "Times New Roman", serif; }
.note { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.55; }

.el {
  display: grid;
  grid-template-columns: 84px 1fr auto;
  align-items: start;
  gap: 6px;
  padding: 8px 0;
  border-bottom: 1px solid var(--line);
  font-size: 12px;
}

.el .fields { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 10px; }
.el label { display: inline-flex; align-items: center; gap: 4px; color: var(--muted); }
.el.gain { grid-template-columns: 84px 1fr; align-items: center; }

.el-name {
  padding-top: 8px;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.el-info { flex-basis: 100%; color: var(--muted); font-size: 11px; }

.el .rm {
  border: 0;
  margin-top: 4px;
  background: none;
  color: var(--muted);
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
  padding: 2px 4px;
}

.el .rm:hover, .seg button:hover, .add button:hover, .reset:hover { color: var(--ink); }
.seg button.on:hover { color: #fff; }

.el.active .el-name { color: var(--accent); }

.add { display: flex; flex-wrap: wrap; gap: 6px; }
.add button { border: 1px solid var(--line); }
.reset { justify-self: start; padding-left: 0; }

.readout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px 16px;
  margin: 0;
}

.readout div { min-width: 0; }
.readout dd { margin: 4px 0 0; font-size: 18px; font-variant-numeric: tabular-nums; }
.readout dd small { font-size: 11px; color: var(--muted); }
.readout .bad dd { color: var(--warn); }
.readout .wide { grid-column: 1 / -1; }

.help ul { margin: 0; padding-left: 16px; color: var(--muted); font-size: 12px; line-height: 1.6; }

@media (max-width: 900px) {
  .play { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  .pair { grid-template-columns: 1fr; }
  #mag { height: 240px; }
  #phase { height: 180px; }
  #nyq, #step { height: 260px; }
}