body {
  background: #345;
}


.expr-input,
.expr-bars,
.expr-context-widgets {
  position: relative;
  margin: 12px 32px;
  width: 456px;
  font: 20px monospace;
  white-space: pre;
}


.expr-input {
  opacity: 0.8;
  color: #9ac;
  background: rgba(2, 4, 8, 0.333);
  border-radius: 4px;
}
.expr-input:hover {
  opacity: 1;
  background: rgba(2, 4, 8, 0.5);
}
.expr-input-highlighted,
.expr-input-textinput {
  box-sizing: border-box;
  padding: 3px 6px;
  border: 1px solid transparent;
  border-width: 1px 0;
  border-radius: 4px;
}
.expr-input-highlighted {
  position: absolute;
  z-index: 1;
}
.expr-input-textinput,
.expr-choice .expr-input-radio-label {
  position: relative;
  z-index: 2;
  width: 100%;
  font: inherit;
  color: rgba(255, 255, 255, 0.333);
  background: transparent;
  border-color: rgba(0, 16, 24, 0.333) transparent rgba(200, 225, 255, 0.2);
}
.expr-input-textinput:focus {
  outline: none;
  border-top-color: rgba(0, 16, 25, 0.667);
}
.expr-expr { color: #936;}
.expr-func { color: #c93; }
.expr-name { color: #096; }
.expr-literal { color: #9ac; }


.expr-bars {
  box-sizing: border-box;
  display: block;
  height: 280px;
  padding: 0 6px;  /* match padding of input */
  border-bottom: 1px dashed rgba(200, 200, 255, 0.3);
}
.expr-bar {
  position: relative;
  display: inline-block;
  color: transparent;
}
.expr-bar-bar {
  display: block;
  position: absolute;
  width: 100%;
  background: rgba(200, 200, 255, 0.15);
  box-shadow: 0 0 3px #345;
}
.expr-bar-bar:hover {
  background: rgba(200, 200, 255, 0.5);
}



.expr-input-const,
.expr-input-range-bound {
  width: 52px;
}
.expr-input.err {
  background: #fcc;
}

.expr-text {
  position: relative;
}
.expr-text:hover {
  border-radius: 6px / 1em;
  background: rgba(0, 0, 0, 0.2);
  cursor: default;
}
.expr-text > .bar {
  display: block;
  position: absolute;
  left: 0;
  right: 0;
  bottom: 22px;
  border: 1px solid rgba(0, 0, 0, 0.4);
  border-width: 1px 1px 0;
  border-radius: 3px 3px 0 0;
  background: rgba(0, 0, 127, 0.4);
}
.expr-text > .bar.negative {
  background: rgba(127, 0, 0, 0.4);
}
.expr-text:hover > .bar {
  background: rgba(0, 127, 0, 0.4);
}


.expr-choice input {
  display: none;  /* TODO: just make it visually hidden */
}

.expr-context-widgets,
.expr-context-widgets li {
  list-style-type: none;
  padding: 0;
  color: rgba(255, 255, 255, 0.333);
}
.expr-context-widgets {
  width: auto;
}
.expr-context-widgets li {
  opacity: 0.85;
}
.expr-context-widgets li:hover {
  opacity: 1;
}
.expr-context-widgets .expr-name {
  color: #5b9;
}
.expr-context-widgets .expr-input {
  display: inline-block;
  width: 64px;
  margin: 1px 2px;
}

.expr-choices {
  margin: 0 2px;
}
.expr-choice {
  margin: 0;
}
.expr-choice .expr-input-radio {
  display: none;
}
.expr-choice .expr-input-radio-label {
  box-sizing: border-box;
  display: inline-block;
  vertical-align: top;
  width: auto;
  margin: 1px 0;
  padding: 3px 6px;
  font-family: sans-serif;
  font-size: 16px;
  line-height: 24px;
  border: 1px solid transparent;
  border-width: 1px 0;
  border-color: rgba(200, 225, 255, 0.2) transparent rgba(0, 16, 24, 0.333);
  background: rgba(100, 120, 130, 0.2);
}
.expr-choice:first-child .expr-input-radio-label {
  border-radius: 4px 0 0 4px;
}
.expr-choice:last-child .expr-input-radio-label {
  border-radius: 0 4px 4px 0;
}
.expr-choice .expr-input-radio:checked + .expr-input-radio-label {
  color: #5b9;
  border-color: rgba(0, 16, 24, 0.333) transparent rgba(200, 225, 255, 0.2);
  background: rgba(2, 4, 8, 0.333);
}

.expr-rangebound-label-text {
  display: none;  /* TODO: just visually hide */
}
.expr-variable-range .expr-input {
  width: 42px;
}
.expr-input-range {
  vertical-align: middle;
}