/* ─── FASTMATH PAGE ──────────────────────────────────── */
#hero { border-top: none; padding-bottom: 0; }

.solver-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: clamp(1.5rem, 4vw, 2.5rem);
  margin-top: var(--gap);
}

.solver-instructions {
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.75;
  margin-bottom: 1.75rem;
}
.solver-instructions strong { color: var(--ink); }

.solver-form {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  gap: 0.75rem;
  align-items: end;
  margin-bottom: 2rem;
}
.solver-form .field { display: flex; flex-direction: column; gap: 0.4rem; }

/* Results */
#results {
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
  min-height: 60px;
}
#results p { font-size: 0.85rem; color: var(--muted); margin-bottom: 1rem; }
#results p strong { color: var(--ink); }

.expr-box {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background: var(--bg);
  border: 1px solid var(--border);
  padding: 0.85rem 1.1rem;
  border-radius: var(--radius);
  margin-bottom: 0.6rem;
  font-size: 1.1rem;
}
.expr-box .copy-btn {
  flex-shrink: 0;
  font-size: 0.75rem;
  padding: 0.35rem 0.85rem;
  letter-spacing: 0.06em;
}

@media (max-width: 560px) {
  .solver-form { grid-template-columns: 1fr; }
  .solver-form .btn { width: 100%; justify-content: center; }
}