+//
+// Component animations
+// --------------------------------------------------
+
+// Heads up!
+//
+// We don't use the `.opacity()` mixin here since it causes a bug with text
+// fields in IE7-8. Source: https://github.com/twitter/bootstrap/pull/3552.
+
+.fade {
+ opacity: 0;
+ .transition(opacity .15s linear);
+ &.in {
+ opacity: 1;
+ }
+}
+
+.collapse {
+ display: none;
+ &.in {
+ display: block;
+ }
+}
+.collapsing {
+ position: relative;
+ height: 0;
+ overflow: hidden;
+ .transition(height .35s ease);
+}