:root {
  --stat: #3a6ea5;
  --mov: #e07b1a;
  --plane: #8fb8e8;
  --plane2: #f3c58a;
  --cone: #d4b100;
  --bg: #f7f7f5;
  --panel: #ffffff;
  --control: #fafafa;
  --text: #222;
  --muted: #666;
  --border: #ddd;
  --code: #f0f0f0;
  --ax-x: #c0392b;
  --ax-y: #27ae60;
  --ax-t: #2962ff;
  color-scheme: light;
}

:root[data-theme="dark"] {
  --bg: #1b1d22;
  --panel: #23262d;
  --control: #2c3038;
  --text: #e6e6e6;
  --muted: #a0a3aa;
  --border: #3a3d45;
  --code: #30343c;
  --ax-x: #ef6f5f;
  --ax-y: #5fd38d;
  --ax-t: #7ea3ff;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 14px;
  color: var(--text);
  background: var(--bg);
}

body {
  display: flex;
  flex-direction: row;
}

#panel {
  width: 340px;
  flex: 0 0 340px;
  height: 100%;
  overflow-y: auto;
  padding: 16px 18px 24px;
  background: var(--panel);
  border-right: 1px solid var(--border);
}

#view {
  flex: 1 1 auto;
  height: 100%;
  min-width: 0;
  position: relative;
}

#view canvas { display: block; }

h1 { font-size: 20px; margin: 0 0 6px; }
h2 { font-size: 13px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); margin: 18px 0 8px; }

.intro { margin: 0 0 6px; line-height: 1.4; }
.ax-x { color: var(--ax-x); font-weight: 600; }
.ax-y { color: var(--ax-y); font-weight: 600; }
.ax-t { color: var(--ax-t); font-weight: 600; }

section { margin-bottom: 4px; }


label { display: block; margin: 10px 0 4px; }
label em { font-style: italic; }

/* touch targets: every control is at least 44px tall */
input[type=range] { width: 100%; height: 44px; margin: 0; cursor: pointer; }
input[type=number], select {
  min-height: 44px;
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--control);
  color: var(--text);
  font: inherit;
}
input[type=number] { width: 80px; }

.row { display: flex; gap: 8px; align-items: center; }
.row input[type=range] { flex: 1 1 auto; }

label.check { display: flex; gap: 10px; align-items: center; min-height: 44px; margin-top: 8px; line-height: 1.35; cursor: pointer; }
label.check input { width: 22px; height: 22px; margin: 0; flex: 0 0 auto; }

.sub { margin: 4px 0 0 12px; padding-left: 10px; border-left: 2px solid var(--plane2); }
.hidden { display: none; }

.note { color: var(--muted); font-size: 12px; line-height: 1.4; margin: 6px 0 0; }

.buttons { display: flex; gap: 6px; }
.buttons button {
  flex: 1 1 0;
  min-height: 44px;
  padding: 6px 4px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--control);
  color: var(--text);
  cursor: pointer;
  font: inherit;
}
.buttons button.active { background: var(--stat); color: #fff; border-color: var(--stat); }

:focus-visible { outline: 2px solid var(--mov); outline-offset: 2px; }

#readout { width: 100%; border-collapse: collapse; }
#readout th, #readout td { padding: 6px 2px; border-bottom: 1px solid var(--border); vertical-align: top; }
#readout th { text-align: left; font-weight: normal; color: var(--muted); width: 70%; }
#readout td { text-align: right; font-variant-numeric: tabular-nums; }
#readout td.hl { color: var(--mov); font-weight: 600; }

.legend ul { list-style: none; padding: 0; margin: 0; }
.legend li { display: flex; align-items: center; gap: 8px; margin: 4px 0; }
.sw { display: inline-block; width: 18px; height: 12px; border-radius: 2px; border: 1px solid rgba(128,128,128,.5); }
.sw-stat { background: var(--stat); }
.sw-mov { background: var(--mov); }
.sw-plane { background: var(--plane); }
.sw-plane2 { background: var(--plane2); }
.sw-cone { background: var(--cone); }

code { font-size: 12px; background: var(--code); padding: 1px 4px; border-radius: 3px; }

@media (max-width: 760px) {
  body { flex-direction: column; }
  #panel { width: 100%; flex: 0 0 auto; height: auto; max-height: 50%; border-right: 0; border-bottom: 1px solid var(--border); }
  #view { height: 50%; }
}