.why-rank-section { padding: 0 0 8px; }
.why-rank-card {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}
.why-rank-card summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}
.why-rank-card summary::-webkit-details-marker { display: none; }
.why-rank-card summary span:first-child { display: flex; flex-direction: column; gap: 3px; }
.why-rank-card summary strong { font-size: 15px; }
.why-rank-card summary small { color: var(--muted); font-size: 13px; line-height: 1.4; }
.why-rank-card summary:focus-visible { outline: 3px solid rgba(31,103,210,.28); outline-offset: -3px; }
.why-rank-chevron { font-size: 21px; color: var(--muted); transition: transform .16s ease; }
.why-rank-card[open] .why-rank-chevron { transform: rotate(180deg); }
.why-rank-body { padding: 0 18px 18px; border-top: 1px solid var(--line); }
.why-rank-body > p { margin: 16px 0; color: var(--muted); line-height: 1.6; }
.why-rank-grid { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 10px; }
.why-rank-grid > div { padding: 14px; border-radius: 14px; background: var(--surface-2); }
.why-rank-grid span, .why-rank-grid small { display: block; color: var(--muted); font-size: 12px; }
.why-rank-grid strong { display: block; margin: 5px 0 4px; font-size: 23px; line-height: 1; }
.why-rank-note { font-size: 12px; }
@media (max-width: 760px) {
  .why-rank-section { padding-bottom: 2px; }
  .why-rank-grid { grid-template-columns: 1fr 1fr; }
  .why-rank-card summary { padding: 14px 15px; }
  .why-rank-body { padding: 0 15px 15px; }
}