.cal-tool {
  max-width: 900px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: 1.25rem;
  align-items: start;
  margin: 2rem 0;
}

.cal-panel {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 1.25rem;
}

.cal-panel-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.cal-panel-heading h2 {
  margin: 0;
  color: var(--text);
  font-size: 1.05rem;
}

.cal-reset,
.cal-copy {
  min-height: 44px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-2);
  color: var(--text);
  font: inherit;
  font-weight: 700;
  padding: 0.55rem 0.9rem;
  cursor: pointer;
  transition: var(--transition);
}

.cal-reset:hover,
.cal-copy:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.cal-unit-toggle {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.cal-segment {
  min-height: 44px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-2);
  color: var(--text-muted);
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}

.cal-segment.active {
  border-color: var(--primary);
  background: var(--primary);
  color: var(--on-primary);
}

.cal-grid {
  display: grid;
  gap: 1rem;
}

.cal-grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.cal-input-panel .input-group {
  margin-bottom: 1rem;
}

.cal-goal-box {
  margin-top: 0.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.cal-empty {
  min-height: 220px;
  display: grid;
  place-items: center;
  text-align: center;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  padding: 1.5rem;
}

.cal-empty[hidden],
.cal-results[hidden] {
  display: none;
}

.cal-results {
  display: grid;
  gap: 1rem;
}

.cal-hero-result {
  display: grid;
  gap: 0.3rem;
  padding: 1.25rem;
  border: 1px solid rgba(var(--primary-rgb), 0.35);
  border-radius: var(--radius);
  background: rgba(var(--primary-rgb), 0.08);
  text-align: center;
}

.cal-label {
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.075em;
  text-transform: uppercase;
}

.cal-hero-result strong {
  color: var(--text);
  font-size: 3rem;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.cal-hero-result span:last-child {
  color: var(--text-muted);
}

.cal-result-grid,
.cal-macros {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
}

.cal-metric,
.cal-macro {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  padding: 0.85rem;
}

.cal-metric span,
.cal-macro span {
  display: block;
  margin-bottom: 0.35rem;
  color: var(--text-muted);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.cal-metric strong,
.cal-macro strong {
  color: var(--text);
  font-size: 1rem;
  font-variant-numeric: tabular-nums;
}

.cal-plans {
  display: grid;
  gap: 0.65rem;
}

.cal-plan {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.75rem;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 0.85rem;
}

.cal-plan.active {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.12);
}

.cal-plan strong {
  display: block;
  color: var(--text);
  margin-bottom: 0.2rem;
}

.cal-plan span {
  color: var(--text-muted);
  font-size: 0.88rem;
}

.cal-plan b {
  color: var(--primary);
  font-size: 1.05rem;
  font-variant-numeric: tabular-nums;
}

.cal-note {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.92rem;
  line-height: 1.65;
}

@media (max-width: 820px) {
  .cal-tool {
    grid-template-columns: 1fr;
  }

  .cal-result-grid,
  .cal-macros {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .cal-panel {
    padding: 1rem;
  }

  .cal-grid-2,
  .cal-result-grid,
  .cal-macros {
    grid-template-columns: 1fr;
  }

  .cal-hero-result strong {
    font-size: 2.4rem;
  }

  .cal-plan {
    grid-template-columns: 1fr;
  }
}