body {
  background: #e8fff7;
  font-family: system-ui;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  margin: 0;
}

.main {
  max-width: 1200px;
  flex-grow: 1; /* allows main content + quick access panel to push footer down */
}

/* Footer stays at bottom */
.footer {
  flex-shrink: 0;
}

/* Optional: Quick Access max-width & spacing */
.quick-access-card {
  border-radius: 16px;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.1);
  background: #f0fff8;
  width: 100%;
  max-width: 900px;
}

.converter-card {
  padding: 20px;
  border-radius: 14px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
}

.unit-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  max-height: 250px;
  overflow-y: auto;
}

.unit-btn {
  border: none;
  padding: 8px 14px;
  border-radius: 10px;
  background: #d6fff3;
  font-weight: 600;
  transition: 0.2s;
  cursor: pointer;
}

.unit-btn.active {
  background: #1abc9c;
  color: white;
}

.unit-btn:hover {
  transform: scale(1.08);
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
}

.result-card {
  background: white;
  padding: 10px;
  border-radius: 10px;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.08);
  font-weight: 600;
  animation: fadeUp 0.25s ease;
  text-align: center;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.quick-access-card {
  border-radius: 16px;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.1);
  background: #f0fff8;
}

#allUnits {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  max-height: 250px; /* scrollable if too many units */
  overflow-y: auto;
  padding: 4px;
  justify-content: center;
}

#allUnits .unit-btn {
  background: #c0f3e0;
  font-size: 0.85rem;
  padding: 5px 10px;
  border-radius: 10px;
  margin: 2px;
  transition: 0.2s;
}

#allUnits .unit-btn:hover {
  transform: scale(1.05);
}

.category-btn {
  border: none;
  padding: 8px 16px;
  border-radius: 12px;
  background: #d6fff3;
  font-weight: 600;
  transition: 0.2s;
  cursor: pointer;
}

.category-btn.active {
  background: #1abc9c;
  color: white;
}

.category-btn:hover {
  transform: scale(1.05);
}