/*----------------------------
	knobKnob Styles
-----------------------------*/
.knob{
	width: 100px;
	height: 100px;
	position: relative;
}

.knob .top{
	position: absolute;
	width: 100%;
	height: 100%;
	background: url(../images/knob.jpg) no-repeat center center;
	z-index: 10;
	cursor: default !important;
	border-radius: 50%;
	box-shadow: inset 0 0 3px 2px rgba(255,255,255,0.6);
}

.knob .base{
	width: 100%;
	height: 100%;
	box-shadow: 0 5px 0 #555, 0px 5px 5px black;
	position: absolute;
	z-index: 1;
	border-radius: 50%;
}

.knob .top:after{
	content: '';
	width: 4px;
	height: 4px;
	background-color: #666;
	position: absolute;
	top: 50%;
	margin-top: -2px;
	left: 4px;
	border-radius: 50%;
	cursor: default !important;
	box-shadow:  
		0 0 1px #5a5a5a inset, 
		1px -1px 1px rgba(255,255,255,0.5);
}

.knob [draggable] {
  -moz-user-select:  none;
  -webkit-user-select:  none;
  user-select:  none;
}

/* ============ 响应式适配 ============ */

@media (max-width: 768px) {
  .knob {
    width: 80px;
    height: 80px;
  }
  .knob .top {
    background-size: contain;
  }
}

@media (max-width: 480px) {
  .knob {
    width: 64px;
    height: 64px;
  }
  .knob .top:after {
    width: 3px;
    height: 3px;
    margin-top: -1.5px;
    left: 3px;
  }
}

@media (max-width: 360px) {
  .knob {
    width: 56px;
    height: 56px;
  }
  .knob .top:after {
    width: 2.5px;
    height: 2.5px;
    margin-top: -1.25px;
    left: 2.5px;
  }
}