.rc-width-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem 1rem;
  align-items: end;
  margin-bottom: 1rem;
}

.rc-field {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}
.rc-field label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.rc-field input,
.rc-field select {
  font-family: var(--mono);
  font-size: 0.95rem;
  padding: 0.45rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
  min-width: 8rem;
}
.rc-field input.rc-wide {
  min-width: min(100%, 22rem);
  width: 100%;
}
.rc-field input.is-bad {
  border-color: var(--err);
  background: var(--err-bg);
}

.rc-bits {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  align-items: center;
  margin: 0.35rem 0 0.75rem;
}
.rc-bit {
  width: 2.1rem;
  height: 2.1rem;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: var(--surface2);
  font-family: var(--mono);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--ink);
}
.rc-bit.is-1 {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}
.rc-bit.is-sign {
  outline: 2px solid var(--signal);
  outline-offset: 1px;
}
.rc-bit-idx {
  display: block;
  font-size: 0.58rem;
  font-weight: 500;
  color: var(--muted);
  line-height: 1;
  margin-top: 0.1rem;
}

.rc-grid {
  display: grid;
  gap: 0.75rem;
}
@media (min-width: 720px) {
  .rc-grid.cols-2 {
    grid-template-columns: 1fr 1fr;
  }
}

.rc-range {
  display: grid;
  gap: 0.45rem;
  font-family: var(--mono);
  font-size: 0.84rem;
}
.rc-range div {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.75rem;
  justify-content: space-between;
  padding: 0.45rem 0.55rem;
  background: var(--surface2);
  border-radius: 8px;
}
.rc-range span.k { color: var(--muted); }
.rc-range span.v { color: var(--ink); font-weight: 600; }

.rc-status {
  margin: 0.5rem 0 0;
  font-size: 0.9rem;
  min-height: 1.3em;
}
.rc-status.ok { color: var(--ok); }
.rc-status.warn { color: var(--warn); }
.rc-status.err { color: var(--err); }

.rc-lit {
  margin: 0;
  padding: 0.65rem 0.75rem;
  background: var(--term-bg);
  color: var(--term-fg);
  border-radius: 8px;
  font-family: var(--mono);
  font-size: 0.86rem;
  line-height: 1.55;
  white-space: pre-wrap;
}

.rc-hint {
  margin: 0.55rem 0 0;
  font-size: 0.88rem;
  color: var(--muted);
}

.rc-chal-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.55rem;
}
.rc-chal-head h2 { margin: 0; }
.rc-chal-progress {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--muted);
}
.rc-chal-catalog {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.4rem;
  margin-bottom: 0.65rem;
  max-height: min(36vh, 320px);
  overflow: auto;
}
.rc-chal-item {
  display: flex;
  gap: 0.45rem;
  align-items: flex-start;
  text-align: left;
  padding: 0.5rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  font: inherit;
}
.rc-chal-item:hover,
.rc-chal-item.is-active {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.rc-chal-item.is-cleared .rc-chal-mark { color: var(--ok); }
.rc-chal-mark {
  font-family: var(--mono);
  color: var(--muted);
  flex-shrink: 0;
}
.rc-chal-title { font-weight: 650; font-size: 0.9rem; display: block; }
.rc-chal-meta {
  font-size: 0.78rem;
  color: var(--muted);
  line-height: 1.35;
}
.rc-chal-prompt {
  margin: 0 0 0.55rem;
  font-size: 0.92rem;
}

.rc-file-btn {
  cursor: pointer;
  display: inline-flex;
  align-items: center;
}

@media print {
  .site-header,
  .site-footer,
  .eyebrow,
  .hero,
  .challenge,
  .no-print {
    display: none !important;
  }
}