.tool-ui { display: flex; flex-direction: column; gap: 1.25rem; }

.calc-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.input-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.input-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--snow);
}

.calc-input {
  width: 100%;
  background: var(--ink);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  color: var(--snow);
  font-size: 1rem;
  font-family: 'JetBrains Mono', monospace;
  outline: none;
  transition: border-color 0.2s;
}
.calc-input:focus { border-color: var(--accent); }

.tip-chips {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.5rem;
}
@media (max-width: 640px) {
  .tip-chips { grid-template-columns: repeat(3, 1fr); }
}

.tip-chip {
  background: var(--ink);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.6rem;
  color: var(--snow);
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  text-align: center;
  transition: all 0.2s;
}
.tip-chip:hover { border-color: var(--accent); color: var(--accent); }
.tip-chip.active { background: var(--accent-dim); border-color: var(--accent); color: var(--accent); }

.results-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}
@media (max-width: 640px) {
  .results-grid { grid-template-columns: 1fr; }
}

.result-box {
  background: var(--ink);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.result-title {
  font-size: 0.8rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-family: 'Inter', sans-serif;
}

.result-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--snow);
  font-family: 'JetBrains Mono', monospace;
}

.ad-post-op {
  border: 1px solid var(--border);
  border-radius: 8px; padding: 1rem;
  font-size: 0.75rem; color: var(--muted); text-align: center;
}