/* Calculator Styles */
/* Optimized for fast rendering and zero layout shift */

.calculator-wrapper {
  background: var(--color-bg);
  border: 2px solid var(--color-border-light);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  margin: var(--spacing-xl) 0;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

[data-theme="light"] .calculator-wrapper {
  background: linear-gradient(to bottom, #ffffff 0%, #fafbfc 100%);
}

[data-theme="dark"] .calculator-wrapper {
  background: var(--color-bg-light);
}

.calculator-wrapper::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
}

.calculator-wrapper > h2 {
  margin-top: 0;
  margin-bottom: var(--spacing-lg);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.calculator-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

/* Form Groups */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.form-group label {
  font-weight: var(--font-weight-semibold);
  font-size: 0.875rem;
  color: var(--color-text-medium);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.form-group input,
.form-group select {
  padding: 0.875rem 1rem;
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  font-size: 1rem;
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  transition: all var(--transition-base);
  box-shadow: var(--shadow-xs);
}

[data-theme="light"] .form-group input,
[data-theme="light"] .form-group select {
  background-color: white;
}

[data-theme="dark"] .form-group input,
[data-theme="dark"] .form-group select {
  background-color: var(--color-bg-lighter);
}

.form-group input:hover,
.form-group select:hover {
  border-color: var(--color-primary-light);
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1), var(--shadow-sm);
  transform: translateY(-1px);
}

.form-group input[type="number"] {
  font-family: var(--font-mono);
  font-weight: var(--font-weight-medium);
  font-size: 1.125rem;
}

.form-group select {
  cursor: pointer;
  appearance: none;
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  background-size: 1.25rem;
  padding-right: 2.5rem;
}

[data-theme="light"] .form-group select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%236b7280'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
}

[data-theme="dark"] .form-group select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%239ca3af'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
}

/* Input Prefix (for currency) */
.input-wrapper {
  position: relative;
}

.input-prefix {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-primary);
  font-weight: var(--font-weight-bold);
  font-size: 1.125rem;
  pointer-events: none;
  font-family: var(--font-mono);
}

.input-wrapper input {
  padding-left: 2rem;
}

/* Radio Group */
.radio-group {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.radio-option {
  flex: 1;
  min-width: fit-content;
}

.radio-option input[type="radio"] {
  display: none;
}

.radio-option label {
  display: block;
  padding: 0.75rem 1.25rem;
  background: var(--color-bg);
  border: 2px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  cursor: pointer;
  font-weight: var(--font-weight-medium);
  text-transform: none;
  letter-spacing: normal;
  transition: all var(--transition-fast);
  text-align: center;
  color: var(--color-text-medium);
  box-shadow: var(--shadow-xs);
}

[data-theme="light"] .radio-option label {
  background: white;
}

[data-theme="dark"] .radio-option label {
  background: var(--color-bg-lighter);
}

.radio-option label:hover {
  border-color: var(--color-primary);
  background: var(--color-bg-light);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.radio-option input[type="radio"]:checked + label {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  border-color: var(--color-primary-dark);
  color: white;
  font-weight: var(--font-weight-semibold);
  box-shadow: var(--shadow-md);
}

.radio-option input[type="radio"]:focus + label {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Calculate Button */
.calculate-btn {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  color: white;
  padding: 1.125rem 2.5rem;
  border: none;
  border-radius: var(--border-radius);
  font-size: 1.125rem;
  font-weight: var(--font-weight-bold);
  cursor: pointer;
  transition: all var(--transition-base);
  margin-top: var(--spacing-md);
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.calculate-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s ease;
}

.calculate-btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.calculate-btn:hover::before {
  left: 100%;
}

.calculate-btn:active {
  transform: translateY(0);
  box-shadow: var(--shadow-md);
}

.calculate-btn:focus-visible {
  outline: 3px solid var(--color-primary-light);
  outline-offset: 3px;
}

/* Results Section */
.results-wrapper {
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-xl);
  border-top: 3px solid var(--color-border-light);
  animation: fadeIn 0.4s ease-out;
}

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

.results-wrapper.hidden {
  display: none;
}

.result-main {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  color: white;
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  margin-bottom: var(--spacing-lg);
  text-align: center;
  box-shadow: var(--shadow-xl);
  position: relative;
  overflow: hidden;
}

.result-main::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
  animation: shimmer 3s ease-in-out infinite;
}

@keyframes shimmer {
  0%, 100% {
    transform: translate(0, 0);
  }
  50% {
    transform: translate(-10%, -10%);
  }
}

.result-label {
  font-size: 0.875rem;
  opacity: 0.95;
  margin-bottom: var(--spacing-sm);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: var(--font-weight-semibold);
}

.result-value {
  font-size: 3rem;
  font-weight: 800;
  font-family: var(--font-mono);
  line-height: 1;
  text-shadow: 0 2px 10px rgba(0,0,0,0.2);
  position: relative;
  z-index: 1;
}

.result-subtitle {
  font-size: 1.125rem;
  opacity: 0.9;
  margin-top: var(--spacing-sm);
  font-weight: var(--font-weight-medium);
  position: relative;
  z-index: 1;
}

/* Breakdown Table */
.breakdown-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin-top: var(--spacing-md);
  background: var(--color-bg);
  border-radius: var(--border-radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

[data-theme="light"] .breakdown-table {
  background: white;
}

[data-theme="dark"] .breakdown-table {
  background: var(--color-bg-lighter);
}

.breakdown-table th,
.breakdown-table td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border-light);
}

.breakdown-table th {
  background: linear-gradient(to bottom, var(--color-bg-lighter) 0%, var(--color-bg-light) 100%);
  font-weight: var(--font-weight-semibold);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-medium);
  border-bottom: 2px solid var(--color-border);
}

.breakdown-table tbody tr {
  transition: background-color var(--transition-fast);
}

.breakdown-table tbody tr:hover {
  background-color: var(--color-bg-lighter);
}

.breakdown-table td {
  font-family: var(--font-mono);
  color: var(--color-text-medium);
}

.breakdown-table td:first-child {
  font-family: var(--font-sans);
  font-weight: var(--font-weight-medium);
}

.breakdown-table tr:last-child td {
  border-bottom: none;
}

.breakdown-table .row-total {
  font-weight: var(--font-weight-bold);
  background: var(--color-bg-light);
  border-top: 2px solid var(--color-border);
}

[data-theme="light"] .breakdown-table .row-total {
  background: linear-gradient(to right, var(--color-bg-light) 0%, white 100%);
}

[data-theme="dark"] .breakdown-table .row-total {
  background: var(--color-bg-lighter);
}

.breakdown-table .row-total td {
  font-size: 1.05rem;
  padding: 1.25rem 1rem;
}

.breakdown-table .amount {
  text-align: right;
  font-weight: var(--font-weight-semibold);
  font-size: 1rem;
}

.breakdown-table .amount-negative {
  color: var(--color-error);
}

.breakdown-table .amount-positive {
  color: var(--color-success);
  font-weight: var(--font-weight-bold);
}

/* Responsive - Mobile First */
@media (max-width: 768px) {
  .calculator-wrapper {
    padding: var(--spacing-lg);
    margin: var(--spacing-md) 0;
  }

  .calculator-wrapper::before {
    height: 3px;
  }

  .result-main {
    padding: var(--spacing-lg);
  }

  .result-value {
    font-size: 2.25rem;
  }

  .result-subtitle {
    font-size: 1rem;
  }

  .breakdown-table th,
  .breakdown-table td {
    padding: 0.75rem 0.5rem;
    font-size: 0.875rem;
  }

  .breakdown-table .row-total td {
    padding: 1rem 0.5rem;
  }

  .radio-group {
    flex-direction: column;
    gap: var(--spacing-xs);
  }

  .radio-option {
    width: 100%;
  }

  .radio-option label {
    width: 100%;
  }

  .calculate-btn {
    padding: 1rem 1.5rem;
    font-size: 1rem;
  }

  .results-wrapper h3 {
    font-size: 1.125rem;
  }
}

/* Tablet */
@media (min-width: 769px) and (max-width: 1024px) {
  .calculator-form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
  }

  .form-group.full-width {
    grid-column: 1 / -1;
  }

  .calculate-btn {
    grid-column: 1 / -1;
  }
}

/* Desktop */
@media (min-width: 1025px) {
  .calculator-form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
  }

  .form-group.full-width {
    grid-column: 1 / -1;
  }

  .calculate-btn {
    grid-column: 1 / -1;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
  }

  .result-value {
    font-size: 3.5rem;
  }

  .breakdown-table th,
  .breakdown-table td {
    padding: 1.25rem 1.5rem;
  }
}

/* Loading State */
.calculating {
  opacity: 0.7;
  pointer-events: none;
  position: relative;
}

.calculating::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 40px;
  height: 40px;
  margin: -20px 0 0 -20px;
  border: 4px solid var(--color-border-light);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Error State */
.error-message {
  background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
  border: 2px solid var(--color-error);
  color: #991b1b;
  padding: var(--spacing-md);
  border-radius: var(--border-radius-sm);
  margin-top: var(--spacing-md);
  font-weight: var(--font-weight-semibold);
  box-shadow: var(--shadow-sm);
  animation: slideIn 0.3s ease-out;
}

[data-theme="dark"] .error-message {
  background: linear-gradient(135deg, #7f1d1d 0%, #991b1b 100%);
  color: #fecaca;
}

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

.error-message::before {
  content: '⚠ ';
  font-weight: bold;
}

/* Help Text */
.help-text {
  font-size: 0.8125rem;
  color: var(--color-text-lighter);
  margin-top: 0.375rem;
  font-style: italic;
}

/* Optional Label */
.optional-label {
  font-size: 0.75rem;
  font-weight: normal;
  color: var(--color-text-lighter);
  font-style: italic;
}

/* Quick Pick Buttons */
.quick-picks {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.375rem;
  transition: opacity 0.2s ease, max-height 0.2s ease;
  overflow: hidden;
}

.quick-picks.hidden {
  opacity: 0;
  max-height: 0;
  margin-top: 0;
}

.quick-picks + .help-text {
  margin-top: 0;
}

.quick-pick-btn {
  padding: 0.375rem 0.75rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-primary);
  background: transparent;
  border: 1px solid var(--color-primary);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.quick-pick-btn:hover {
  background: var(--color-primary);
  color: white;
  transform: translateY(-1px);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.quick-pick-btn:active {
  transform: translateY(0);
}

[data-theme="dark"] .quick-pick-btn {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

[data-theme="dark"] .quick-pick-btn:hover {
  background: var(--color-accent);
  color: var(--color-bg);
}