/* Cards */
.card {
  background-color: var(--surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* Forms */
.form-group {
  margin-bottom: var(--spacing-lg);
}

label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
  color: var(--text-main);
}

input[type="number"], select {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: inherit;
  font-size: 1rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

input[type="number"]:focus, select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(255, 123, 0, 0.1);
}

/* Buttons */
.btn {
  display: inline-block;
  background-color: var(--primary);
  color: white;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  text-align: center;
  text-decoration: none;
  transition: background-color 0.2s, transform 0.1s;
  width: 100%;
}

.btn:hover {
  background-color: var(--primary-hover);
}

.btn:active {
  transform: scale(0.98);
}

.btn-secondary {
  background-color: var(--text-muted);
}

.btn-secondary:hover {
  background-color: var(--text-main);
}

/* Results Area */
.result-box {
  background-color: #E8F5E9; /* Light green */
  border: 1px solid var(--success);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  margin-top: var(--spacing-xl);
  display: none;
}

.result-box.active {
  display: block;
  animation: fadeIn 0.3s ease-in-out;
}

.result-title {
  color: var(--success);
  margin-bottom: var(--spacing-sm);
  font-size: 1.25rem;
}

.result-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: var(--spacing-sm);
}

/* AdSense Banners */
.ad-banner {
  background-color: #f8f9fa;
  border: 1px dashed #ced4da;
  text-align: center;
  padding: 1rem;
  margin: var(--spacing-lg) 0;
  color: #adb5bd;
  font-size: 0.875rem;
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Grid Layout for Home */
.calculator-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
}

.calc-card {
  text-align: center;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.calc-card-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  color: var(--primary);
}

.calc-card p {
  color: var(--text-muted);
  margin-bottom: var(--spacing-lg);
  flex-grow: 1;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}