* { box-sizing: border-box; }


/* ---- button-group ---- */

.button-group {
  display: flex;
  flex-wrap: wrap;
  margin: 0 auto;
  padding: 0;
  max-width: 1200px;
  gap: 15px;
  justify-content: center;
  margin-bottom: 40px;
}


.button-group .button {
  color: var(--contrast-2);
  border-radius: 40px;
  border: 2px solid var(--accent);
  background-color: rgba(0,0,0,0.01);
  transition: all 0.2s;
  padding: 10px 20px;
  
}


/* ---- button ---- */

.button {
  /*display: inline-block;*/
  /*padding: 0.5em 1.0em;*/
  /*background: #EEE;*/
  /*border: none;*/
  /*border-radius: 7px;*/
  /*background-image: linear-gradient( to bottom, hsla(0, 0%, 0%, 0), hsla(0, 0%, 0%, 0.2) );*/
  /*color: #222;*/
  /*font-family: sans-serif;*/
  /*font-size: 16px;*/
  /*text-shadow: 0 1px white;*/
  /*cursor: pointer;*/
}

.button:hover {
  background-color: var(--accent-2);
  color: white;
}

.button:active,
.button.is-checked {
  background-color: var(--accent-2);
}

.button.is-checked {
  color: white;
}


/*.button-group .button:first-child { border-radius: 0.5em 0 0 0.5em; }*/
/*.button-group .button:last-child { border-radius: 0 0.5em 0.5em 0; }*/

/* ---- isotope ---- */

.grid {
  /*border: 1px solid #333;*/
  
}

.mad_archive-mnts {
    margin-left: 10px;
}

/* clear fix */
.grid:after {
  /*content: '';*/
  /*display: block;*/
  /*clear: both;*/
}

/* ---- .element-item ---- */

.element-item {
  position: relative;
  float: left;
  /*width: 100px;*/
  /*height: 100px;*/
  width: 32%;
  min-width: 300px;
  height: 440px;
  margin-right: 1%;
  margin-bottom: 40px;
  padding: 0px;
  /*background: #888;*/
  color: #262524;
}

.element-item > * {
  margin: 0;
  padding: 0;
}

.element-item .name {
  position: absolute;

  left: 10px;
  top: 60px;
  text-transform: none;
  letter-spacing: 0;
  font-size: 12px;
  font-weight: normal;
}

.element-item .symbol {
  position: absolute;
  left: 10px;
  top: 0px;
  font-size: 42px;
  font-weight: bold;
  color: white;
}

.element-item .number {
  position: absolute;
  right: 8px;
  top: 5px;
}

.element-item .weight {
  position: absolute;
  left: 10px;
  top: 76px;
  font-size: 12px;
}

/*.element-item.alkali          { background: #F00; background: hsl(   0, 100%, 50%); }*/
/*.element-item.alkaline-earth  { background: #F80; background: hsl(  36, 100%, 50%); }*/
/*.element-item.lanthanoid      { background: #FF0; background: hsl(  72, 100%, 50%); }*/
/*.element-item.actinoid        { background: #0F0; background: hsl( 108, 100%, 50%); }*/
/*.element-item.transition      { background: #0F8; background: hsl( 144, 100%, 50%); }*/
/*.element-item.post-transition { background: #0FF; background: hsl( 180, 100%, 50%); }*/
/*.element-item.metalloid       { background: #08F; background: hsl( 216, 100%, 50%); }*/
/*.element-item.diatomic        { background: #00F; background: hsl( 252, 100%, 50%); }*/
/*.element-item.halogen         { background: #F0F; background: hsl( 288, 100%, 50%); }*/
/*.element-item.noble-gas       { background: #F08; background: hsl( 324, 100%, 50%); }*/