.math100-series-tools {
  margin-top: 2rem;
  text-align: left;
}

.math100-series-tools__panel {
  background: #fff;
  border: 1px solid #dfe7ef;
  border-radius: 8px;
  box-shadow: 0 6px 18px rgba(33, 56, 82, 0.08);
  margin-bottom: 1rem;
  padding: 1.1rem;
}

.math100-series-tools__panel h2,
.math100-series-tools__panel h3 {
  margin-top: 0;
}

.math100-series-tools__links {
  display: grid;
  gap: 0.6rem;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  margin-top: 0.8rem;
}

.math100-series-tools__links a,
.math100-series-tools__return a {
  background: #f8fbff;
  border: 1px solid #d7e4f2;
  border-radius: 6px;
  color: #1b5fa7;
  display: block;
  font-weight: 700;
  line-height: 1.5;
  padding: 0.7rem 0.8rem;
  text-decoration: none;
  word-break: keep-all;
  overflow-wrap: anywhere;
}

.math100-series-tools__links a:hover,
.math100-series-tools__return a:hover {
  background: #eef6ff;
  color: #0d4b89;
}

.math100-series-tools__guide {
  margin-bottom: 0;
  padding-left: 1.2rem;
}

.math100-series-tools__guide li + li {
  margin-top: 0.35rem;
}

.math100-series-tools__return {
  display: grid;
  gap: 0.8rem;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.math100-series-tools__return strong,
.math100-series-tools__return span,
.math100-series-tools__return small {
  display: block;
}

.math100-series-tools__return small {
  color: #4d647a;
  font-weight: 400;
}

@media screen and (max-width: 640px) {
  .math100-series-tools {
    margin-top: 1.4rem;
  }

  .math100-series-tools__panel {
    padding: 0.9rem;
  }
}