* { box-sizing: border-box }

body {
  font-family:
    -apple-system,
    BlinkMacSystemFont,
    'Helvetica Neue',
    Helvetica,
    sans-serif;
  line-height: 1.5;
  margin: 0;
  background-color: #fff;
}

.medium { font-weight: 500 }
strong { font-weight: 600 }

.white { color: #fff }
.red  { color: #74120F }

.bd { border: 3px solid }
.bt { border-top: 3px solid }
.br { border-right: 3px solid }
.bb { border-bottom: 3px solid }
.bl { border-left: 3px solid }

a {
  color: #3377BB;
  text-decoration: none;
}

a:hover {
  color: #225577;
  text-decoration: underline;
}

.codelike {
  font-family: monospace;
}

table {
  border-collapse: separate;
  border-spacing: 0;
}

table.table-light {
  margin-left: -10px;
  margin-right: -10px;
}

th {
  text-align: left;
  font-weight: bold;
}

th,
td {
  padding: 8px 10px 10px;
  line-height: inherit;
}

th { vertical-align: bottom }
td { vertical-align: top }

.table-light th,
.table-light td {
  border-bottom-width: 1px;
  border-bottom-style: solid;
  border-bottom-color: rgba(36,51,64, 0.5);
}

.table-light tr:last-child td {
  border-bottom: 0;
}

@media (min-width: 52em) {
  .md-p4  { padding: 4rem !important }
  .md-py4 { padding-top: 4rem !important; padding-bottom: 4rem !important; }
}

@media (max-width: 52em) {
  #tldr-table thead {
    display: none !important;
  }
  #tldr-table td {
    display: block;
    border-bottom: 0;
    padding: 4px 10px 6px;
  }
  #tldr-table td:nth-of-type(3):before { content: "Best book: "; }
  #tldr-table td:nth-of-type(4):before { content: "Best video lectures: "; }

  #tldr-table td:last-child {
    padding-bottom: 2em;
    content: "Best video lectures:";
  }
}