/**
 * Solar Calculator Component - Story 1.1
 * Clean, modern, responsive calculator form
 * Mobile-first approach with SolarClever brand colors
 */

/* ==================== Variables ==================== */
:root {
  --solar-primary: #0a605f;
  --solar-primary-light: #14b8a6;
  --solar-secondary: #22c55e;
  --solar-background: #f8f9fa;
  --solar-surface: #ffffff;
  --solar-text: #2c3e50;
  --solar-text-light: #495057;
  --solar-border: #e8f4f8;
  --solar-error: #dc3545;
  --solar-success: #22c55e;

  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 32px rgba(10, 96, 95, 0.1);
  --shadow-btn: 0 6px 24px rgba(10, 96, 95, 0.3);

  --transition: all 0.3s ease;
}

/* ==================== Main Container ==================== */
.solar-calculator {
  max-width: 1200px;
  margin: var(--spacing-xl) auto;
  padding: var(--spacing-xl);
  background: linear-gradient(135deg, var(--solar-background) 0%, #e8f5e8 100%);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(10, 96, 95, 0.1);
}

/* ==================== Form Structure ==================== */
.calculator-form {
  background: var(--solar-surface);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
  z-index: 0; /* Ensure form stays below results */
}

/* Force form to stay visible */
.calculator-form[style*="display: none"],
.calculator-form.hidden {
  display: block !important;
  visibility: visible !important;
}

.calculator-form::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--solar-primary), var(--solar-primary-light), var(--solar-secondary));
}

/* ==================== Header ==================== */
.calculator-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.calculator-header h2 {
  color: var(--solar-primary);
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
  line-height: 1.2;
}

.calculator-subtitle {
  color: var(--solar-text-light);
  font-size: 1.2rem;
  line-height: 1.6;
  max-width: 600px;
  margin: 0 auto;
}

/* ==================== Input Grid ==================== */
.calculator-inputs {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

/* ==================== Form Fields ==================== */
.form-field {
  display: flex;
  flex-direction: column;
  position: relative;
}

.form-field label {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--solar-text);
  margin-bottom: var(--spacing-sm);
}

.field-icon {
  width: 24px;
  height: 24px;
  color: var(--solar-primary);
  flex-shrink: 0;
}

.form-field input,
.form-field select {
  padding: 1rem 1.25rem;
  border: 2px solid var(--solar-border);
  border-radius: var(--radius-md);
  font-size: 1.1rem;
  font-family: inherit;
  background: #fafbfc;
  transition: var(--transition);
  line-height: 1.5;
}

.form-field input:hover,
.form-field select:hover {
  border-color: #c8e6c9;
  background: #f8fff8;
}

.form-field input:focus,
.form-field select:focus {
  outline: none;
  border-color: var(--solar-primary);
  box-shadow: 0 0 0 4px rgba(10, 96, 95, 0.1);
  background: var(--solar-surface);
  transform: translateY(-1px);
}

.form-field input:invalid:not(:placeholder-shown),
.form-field select:invalid {
  border-color: var(--solar-error);
  background: #fff8f8;
}

/* ==================== kWp Live Display ==================== */
.kwp-display {
  margin-top: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: rgba(10, 96, 95, 0.05);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--solar-primary);
  font-weight: 600;
  font-size: 1rem;
  color: var(--solar-primary);
}

#kwp-value {
  font-weight: 800;
  font-size: 1.1rem;
}

/* ==================== Field Help Text ==================== */
.field-help {
  margin-top: var(--spacing-xs);
  font-size: 0.95rem;
  color: var(--solar-text-light);
  line-height: 1.4;
}

/* ==================== Calculate Button ==================== */
.calculate-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  width: 100%;
  padding: 1.25rem 2.5rem;
  background: linear-gradient(135deg, var(--solar-primary) 0%, var(--solar-primary-light) 100%);
  color: white;
  border: none;
  border-radius: var(--radius-lg);
  font-size: 1.2rem;
  font-weight: 700;
  font-family: inherit;
  cursor: pointer;
  transition: var(--transition);
  box-shadow: var(--shadow-btn);
  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 0.6s ease;
}

.calculate-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(10, 96, 95, 0.4);
  background: linear-gradient(135deg, #084c4b 0%, #0f9e98 100%);
}

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

.calculate-btn:active {
  transform: translateY(0);
  box-shadow: 0 4px 16px rgba(10, 96, 95, 0.3);
}

.calculate-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.btn-icon {
  width: 24px;
  height: 24px;
}

/* ==================== Results Placeholder ==================== */
.results-placeholder {
  text-align: center;
  padding: var(--spacing-xl);
  background: var(--solar-surface);
  border-radius: var(--radius-lg);
  margin-top: var(--spacing-lg);
  box-shadow: var(--shadow-md);
  border: 2px dashed var(--solar-border);
}

.placeholder-icon {
  color: var(--solar-primary);
  opacity: 0.3;
  margin-bottom: var(--spacing-md);
}

.results-placeholder h3 {
  color: var(--solar-text);
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.results-placeholder p {
  color: var(--solar-text-light);
  font-size: 1rem;
  line-height: 1.6;
}

/* ==================== Responsive Design ==================== */

/* Tablet (768px - 1024px) */
@media (max-width: 1024px) {
  .solar-calculator {
    padding: var(--spacing-lg);
    margin: var(--spacing-lg) auto;
  }

  .calculator-form {
    padding: var(--spacing-lg);
  }

  .calculator-header h2 {
    font-size: 2rem;
  }

  .calculator-inputs {
    gap: var(--spacing-md);
  }
}

/* Mobile (<768px) */
@media (max-width: 768px) {
  .solar-calculator {
    margin: var(--spacing-md) auto;
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
  }

  .calculator-form {
    padding: var(--spacing-md);
  }

  .calculator-header h2 {
    font-size: 1.75rem;
  }

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

  .calculator-inputs {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .calculate-btn {
    padding: 1rem 2rem;
    font-size: 1.1rem;
  }

  .results-placeholder {
    padding: var(--spacing-lg);
  }
}

/* Small Mobile (<576px) */
@media (max-width: 576px) {
  :root {
    --spacing-xl: 2rem;
    --spacing-lg: 1.5rem;
    --spacing-md: 1rem;
  }

  .solar-calculator {
    padding: var(--spacing-sm);
    margin: var(--spacing-sm) auto;
  }

  .calculator-form {
    padding: var(--spacing-md) var(--spacing-sm);
  }

  .calculator-header h2 {
    font-size: 1.5rem;
  }

  .form-field input,
  .form-field select {
    padding: 0.875rem 1rem;
    font-size: 1rem;
  }

  .calculate-btn {
    padding: 0.875rem 1.5rem;
    font-size: 1rem;
  }
}

/* ==================== Accessibility ==================== */

/* Focus visible for keyboard navigation */
.calculator-form *:focus-visible {
  outline: 2px solid var(--solar-primary);
  outline-offset: 2px;
}

/* Screen reader only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .form-field input,
  .form-field select {
    border-width: 3px;
  }

  .calculate-btn {
    border: 3px solid var(--solar-surface);
  }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ==================== Touch Targets (Mobile) ==================== */
@media (hover: none) and (pointer: coarse) {
  .form-field input,
  .form-field select,
  .calculate-btn {
    min-height: 44px; /* WCAG minimum touch target */
  }

  .form-field label {
    min-height: 44px;
    display: flex;
    align-items: center;
  }
}

/* ==================== Dynamic Sections (Story 1.2) ==================== */

.dynamic-section {
  margin-top: var(--spacing-lg);
  padding: var(--spacing-md);
  background: linear-gradient(135deg, #f8fff8 0%, #f0f9ff 100%);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--solar-primary);
  transition: var(--transition);
}

.section-toggle {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: 0;
}

.toggle-checkbox {
  width: 24px;
  height: 24px;
  cursor: pointer;
  accent-color: var(--solar-primary);
}

.toggle-label {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--solar-text);
  cursor: pointer;
  user-select: none;
}

.toggle-label:hover {
  color: var(--solar-primary);
}

/* Dynamically shown/hidden fields */
.mieterstrom-fields,
.iab-fields {
  margin-top: var(--spacing-md);
  overflow: hidden;
  transition: all 0.3s ease-in-out;
}

.dynamic-fields-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
}

/* ==================== Range Slider Styling ==================== */

.range-slider {
  width: 100%;
  height: 8px;
  border-radius: 4px;
  background: linear-gradient(to right, var(--solar-primary-light), var(--solar-secondary));
  outline: none;
  -webkit-appearance: none;
  appearance: none;
  cursor: pointer;
}

.range-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--solar-primary);
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(10, 96, 95, 0.3);
  transition: var(--transition);
}

.range-slider::-webkit-slider-thumb:hover {
  transform: scale(1.1);
  box-shadow: 0 4px 12px rgba(10, 96, 95, 0.4);
}

.range-slider::-moz-range-thumb {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--solar-primary);
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(10, 96, 95, 0.3);
  border: none;
  transition: var(--transition);
}

.range-slider::-moz-range-thumb:hover {
  transform: scale(1.1);
  box-shadow: 0 4px 12px rgba(10, 96, 95, 0.4);
}

.range-labels {
  display: flex;
  justify-content: space-between;
  margin-top: var(--spacing-xs);
  font-size: 0.875rem;
  color: var(--solar-text-light);
}

.value-display {
  font-weight: 800;
  color: var(--solar-primary);
  font-size: 1.2rem;
}

/* ==================== IAB Savings Display ==================== */

.iab-savings-display {
  margin-top: var(--spacing-md);
  animation: slideDown 0.3s ease-out;
}

.savings-card {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
  background: linear-gradient(135deg, #e8f5e8 0%, #d1f4d1 100%);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--solar-secondary);
  box-shadow: var(--shadow-sm);
}

.savings-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  color: var(--solar-secondary);
}

.savings-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.savings-label {
  font-size: 0.95rem;
  color: var(--solar-text-light);
  font-weight: 500;
}

.savings-amount {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--solar-secondary);
  font-variant-numeric: tabular-nums;
}

/* ==================== Enhanced Field Help ==================== */

.field-help-highlight {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  background: rgba(10, 96, 95, 0.05);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--solar-primary-light);
}

.field-help-info {
  background: rgba(20, 184, 166, 0.05);
  padding: var(--spacing-sm);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--solar-primary-light);
}

.field-help-info strong {
  color: var(--solar-primary);
}

/* ==================== Animations ==================== */

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

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* Smooth show/hide for dynamic fields */
.mieterstrom-fields[style*="display: block"],
.iab-fields[style*="display: block"] {
  animation: slideDown 0.3s ease-out;
}

/* ==================== Responsive: Dynamic Sections ==================== */

@media (max-width: 768px) {
  .dynamic-section {
    padding: var(--spacing-sm);
  }

  .dynamic-fields-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
  }

  .savings-card {
    flex-direction: column;
    text-align: center;
    gap: var(--spacing-sm);
  }

  .savings-amount {
    font-size: 1.5rem;
  }
}

/* ==================== Story 1.4: Results Display ==================== */

/* Results Container */
.calculator-results {
  margin-top: var(--spacing-xl);
  padding: var(--spacing-xl);
  background: var(--solar-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border: 2px solid var(--solar-primary);
  animation: fadeIn 0.5s ease-out;
  position: relative;
  z-index: 1; /* Ensure results are above form if needed */
  clear: both; /* Clear any floating elements */
}

/* Visual separator between form and results */
.calculator-results::before {
  content: '';
  position: absolute;
  top: -2rem;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background: linear-gradient(90deg, transparent, var(--solar-primary), transparent);
  border-radius: 2px;
}

.results-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-md);
  border-bottom: 2px solid var(--solar-border);
}

.results-header h3 {
  color: var(--solar-primary);
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
}

.results-subtitle {
  color: var(--solar-text-light);
  font-size: 1rem;
}

/* Metrics Dashboard */
.metrics-dashboard {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.metric-card {
  background: var(--solar-background);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  text-align: center;
  border: 1px solid var(--solar-border);
  transition: var(--transition);
}

.metric-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.metric-card.primary {
  background: linear-gradient(135deg, var(--solar-primary), #0d7d7c);
  color: white;
  border: none;
}

.metric-value {
  font-size: 2rem;
  font-weight: bold;
  margin-bottom: var(--spacing-xs);
  line-height: 1;
}

.metric-label {
  font-size: 0.95rem;
  font-weight: 500;
  margin-bottom: var(--spacing-xs);
  opacity: 0.9;
}

.metric-sublabel {
  font-size: 0.85rem;
  opacity: 0.7;
}

.metric-indicator {
  font-size: 0.85rem;
  padding: 0.375rem 0.75rem;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.2);
  display: inline-block;
  margin-top: var(--spacing-xs);
}

.metric-card:not(.primary) .metric-indicator {
  background: var(--solar-primary);
  color: white;
}

.metric-indicator.excellent {
  background: rgba(34, 197, 94, 0.2);
}

.metric-indicator.good {
  background: rgba(34, 197, 94, 0.15);
}

.metric-indicator.acceptable {
  background: rgba(251, 191, 36, 0.2);
}

/* Charts Section */
.charts-section {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.chart-container {
  background: var(--solar-background);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  border: 1px solid var(--solar-border);
}

.chart-container h4 {
  margin-bottom: var(--spacing-md);
  color: var(--solar-primary);
  font-size: 1.1rem;
  font-weight: 600;
  text-align: center;
}

.canvas-wrapper {
  position: relative;
  width: 100%;
  height: 300px;
}

.chart-container canvas {
  width: 100% !important;
  height: 100% !important;
  max-height: 300px;
}

/* Financial Breakdown */
.financial-breakdown {
  background: var(--solar-background);
  padding: var(--spacing-xl);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-lg);
  border: 1px solid var(--solar-border);
}

.financial-breakdown h4 {
  margin-bottom: var(--spacing-md);
  color: var(--solar-primary);
  font-size: 1.3rem;
  font-weight: 600;
  text-align: center;
}

.breakdown-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid #e9ecef;
  font-size: 1rem;
}

.breakdown-row:last-child {
  border-bottom: none;
}

.breakdown-row .label {
  color: var(--solar-text);
  font-weight: 500;
}

.breakdown-row .value {
  font-weight: 600;
  font-size: 1.1rem;
}

.breakdown-row .value.positive {
  color: var(--solar-success);
}

.breakdown-row .value.negative {
  color: var(--solar-error);
}

.breakdown-row.total {
  font-weight: bold;
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 2px solid var(--solar-primary);
  border-bottom: none;
  font-size: 1.1rem;
}

.breakdown-row.total .value {
  color: var(--solar-primary);
  font-size: 1.4rem;
}

/* IAB Results Section */
.iab-results-section {
  margin-top: var(--spacing-xl);
  padding: var(--spacing-md);
  background: linear-gradient(135deg, #e8f5e8, #d4edda);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--solar-success);
  animation: slideDown 0.3s ease-out;
}

.iab-results-section h5 {
  color: var(--solar-success);
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  text-align: center;
}

.breakdown-row.highlight {
  background: rgba(34, 197, 94, 0.05);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(34, 197, 94, 0.2);
  margin-bottom: var(--spacing-xs);
}

/* Results Actions */
.results-actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--solar-border);
}

.btn {
  padding: 0.875rem 1.75rem;
  border: none;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}

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

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

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

.btn-primary:hover {
  background: #0d7d7c;
}

.btn-secondary {
  background: #6c757d;
  color: white;
}

.btn-secondary:hover {
  background: #5a6268;
}

.btn .icon {
  width: 20px;
  height: 20px;
}

/* ==================== Responsive: Results ==================== */

@media (max-width: 768px) {
  .calculator-results {
    padding: var(--spacing-md);
  }

  .results-header h3 {
    font-size: 1.5rem;
  }

  .metrics-dashboard {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
  }

  .metric-value {
    font-size: 1.5rem;
  }

  .metric-label {
    font-size: 0.85rem;
  }

  .charts-section {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .financial-breakdown {
    padding: var(--spacing-md);
  }

  .breakdown-row {
    font-size: 0.9rem;
  }

  .breakdown-row .value {
    font-size: 1rem;
  }

  .breakdown-row.total .value {
    font-size: 1.2rem;
  }

  .results-actions {
    flex-direction: column;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .metrics-dashboard {
    grid-template-columns: 1fr;
  }

  .metric-card {
    padding: var(--spacing-sm);
  }

  .breakdown-row {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }
}

/* ==================== Print Styles ==================== */
@media print {
  .solar-calculator {
    box-shadow: none;
    border: 1px solid #000;
  }

  .calculate-btn {
    display: none;
  }

  .results-placeholder {
    display: none;
  }

  .results-actions {
    display: none;
  }

  .dynamic-section {
    page-break-inside: avoid;
  }

  .calculator-results {
    page-break-inside: avoid;
    border: 2px solid #000;
  }

  .charts-section {
    page-break-inside: avoid;
  }

  .metric-card.primary {
    background: #0a605f !important;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }
}