.app-toolchain {
  margin: 28px 0 0;
  overflow: hidden;
  border: 1px solid var(--ctm-border);
  border-radius: 18px;
  background: linear-gradient(145deg, #f8f4ec 0%, #edf4ef 100%);
  box-shadow: var(--ctm-shadow-panel);
}

.app-toolchain__head {
  padding: 16px 19px 14px;
  border-bottom: 1px solid rgba(23, 75, 62, .1);
}

.app-toolchain__head > span {
  display: block;
  color: var(--ctm-terracotta-dark);
  font-size: .69rem;
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.app-toolchain__head h3 {
  margin: 4px 0 0;
  color: var(--ctm-forest-dark);
  font-family: var(--ctm-font-serif);
  font-size: 1.28rem;
  font-weight: 600;
  line-height: 1.25;
}

.app-toolchain__track {
  display: grid;
  margin: 0;
  padding: 22px;
  list-style: none;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.app-toolchain__track > li {
  position: relative;
  display: flex;
  min-width: 0;
  min-height: 250px;
  padding: 15px 13px 13px;
  border: 1px solid rgba(23, 75, 62, .13);
  border-radius: 14px;
  background: rgba(255, 255, 255, .86);
  flex-direction: column;
}

.app-toolchain__track > li:last-child {
  border-color: rgba(211, 72, 43, .18);
  background: rgba(255, 240, 234, .8);
}

.app-toolchain__track > li:not(:last-child)::after {
  position: absolute;
  top: 28px;
  right: -15px;
  z-index: 2;
  display: grid;
  width: 18px;
  height: 18px;
  border: 1px solid rgba(23, 75, 62, .16);
  border-radius: 50%;
  background: var(--ctm-surface);
  color: var(--ctm-forest);
  content: "›";
  font-size: 1rem;
  font-weight: 800;
  place-items: center;
}

.app-toolchain__number {
  color: var(--ctm-terracotta-dark);
  font-family: var(--ctm-font-serif);
  font-size: .78rem;
  font-weight: 700;
}

.app-toolchain__track div { margin-top: 12px; }

.app-toolchain__track small {
  display: block;
  color: var(--ctm-terracotta-dark);
  font-size: .68rem;
  font-weight: 800;
  letter-spacing: .07em;
  line-height: 1.35;
  text-transform: uppercase;
}

.app-toolchain__track strong {
  display: block;
  margin-top: 5px;
  color: var(--ctm-forest-dark);
  font-family: var(--ctm-font-serif);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.24;
}

.app-toolchain__track p {
  margin: 6px 0 0;
  color: var(--ctm-text-muted);
  font-size: 13px;
  line-height: 1.5;
}

.app-toolchain__track em {
  margin-top: auto;
  padding-top: 12px;
  color: var(--ctm-text-subtle);
  font-size: 13px;
  font-style: normal;
  font-weight: 800;
  line-height: 1.35;
}

.app-toolchain figcaption {
  padding: 14px 20px 16px;
  border-top: 1px solid rgba(23, 75, 62, .1);
  color: var(--ctm-text-muted);
  font-size: 13px;
  line-height: 1.55;
}

@media (max-width: 780px) {
  .app-toolchain__track { padding: 14px; grid-template-columns: 1fr; gap: 9px; }
  .app-toolchain__track > li { min-height: 0; padding: 14px; }
  .app-toolchain__track > li:not(:last-child)::after { display: none; }
  .app-toolchain__track p,
  .app-toolchain__track em,
  .app-toolchain figcaption { font-size: 14px; }
  .app-toolchain__track em { margin-top: 9px; padding-top: 0; }
}

@media (max-width: 600px) {
  .app-toolchain__head { padding: 15px 16px 14px; }
  .app-toolchain__head h3 { font-size: 1.18rem; }
  .app-toolchain figcaption { padding: 13px 16px 15px; }
}