* { box-sizing: border-box; }

body {
  margin: 0;
  font: 14px/1.45 system-ui, -apple-system, sans-serif;
  background: #14161a;
  color: #d8dade;
}

header { padding: 14px 20px 6px; }
header h1 { margin: 0 0 4px; font-size: 20px; font-weight: 600; }
.subtitle { color: #9aa0aa; max-width: 70em; }

.layout {
  display: flex;
  gap: 16px;
  padding: 12px 20px 24px;
  align-items: flex-start;
}

#controls {
  flex: 0 0 300px;
  background: #1c1f25;
  border: 1px solid #2a2e36;
  border-radius: 8px;
  padding: 14px;
  position: sticky;
  top: 12px;
}

.io-row { display: flex; gap: 8px; margin-bottom: 6px; }
.filebtn, #resetbtn {
  flex: 1;
  text-align: center;
  background: #2a2e36;
  border: 1px solid #3a3f4a;
  border-radius: 6px;
  color: #d8dade;
  padding: 6px 8px;
  font-size: 13px;
  cursor: pointer;
}
.filebtn:hover, #resetbtn:hover { background: #343945; }
.filebtn input { display: none; }

#swathsel {
  width: 100%;
  margin-bottom: 6px;
  background: #2a2e36;
  border: 1px solid #3a3f4a;
  border-radius: 6px;
  color: #d8dade;
  padding: 6px 8px;
  font-size: 13px;
}
#filemsg { min-height: 1.2em; font-size: 12px; color: #e0a34e; margin-bottom: 8px; }

.slider-row { margin-bottom: 10px; }
.slider-row .lbl {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  margin-bottom: 2px;
}
.slider-row .lbl .val { color: #7ec8e3; font-variant-numeric: tabular-nums; }
.slider-row input[type=range] { width: 100%; margin: 0; }

#statusbar {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid #2a2e36;
  font-size: 13px;
}
#statusbar > div { display: flex; justify-content: space-between; }
#statusbar .k { color: #9aa0aa; }
#st-status.ok { color: #7fd48a; }
#st-status.bad { color: #e06a6a; }

#hoverbox {
  margin-top: 8px;
  font: 12px/1.4 ui-monospace, Menlo, monospace;
  color: #9aa0aa;
  min-height: 2.8em;
}

.footnote {
  margin-top: 10px;
  font-size: 12px;
  color: #757c88;
}

#plots {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.imrow { display: flex; flex-direction: column; gap: 12px; }

figure { margin: 0; }
figcaption { font-size: 13px; color: #9aa0aa; margin-bottom: 4px; }

canvas {
  width: 100%;
  display: block;
  background: #0d0e11;
  border: 1px solid #2a2e36;
  border-radius: 4px;
}
.imrow canvas {
  image-rendering: pixelated;
  width: 100%;
  max-height: 42vh;
  object-fit: contain;   /* tall uploads letterbox instead of distorting */
}
figure.line canvas { height: 190px; }

@media (max-width: 900px) {
  .layout { flex-direction: column; }
  #controls { position: static; flex: none; width: 100%; }
}