/**
 * Hess-Gesetz Rechner Styles
 * WCAG 2.1 AA Compliant - Optimized for accessibility
 */

.hess-gesetz-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px;
}

.calculator-panel {
  background: #f8f9fa;
  padding: 30px;
  border-radius: 10px;
  margin-bottom: 30px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  border: 2px solid #e0e0e0;
}

.calculator-panel h2 {
  color: #1a1a1a;
  margin-bottom: 15px;
}

.input-section {
  margin: 20px 0;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  font-weight: 600;
  color: #1a1a1a;
  margin-bottom: 5px;
  display: block;
}

.form-control {
  padding: 10px;
  border: 2px solid #8b95a3;
  border-radius: 5px;
  font-size: 16px;
  color: #1a1a1a;
  background: white;
  width: 100%;
}

.form-control:focus {
  outline: none;
  border-color: #1565c0;
  box-shadow: 0 0 0 3px rgba(21, 101, 192, 0.2);
}

.steps-container {
  background: white;
  padding: 20px;
  border-radius: 8px;
  margin: 20px 0;
  border: 2px solid #e0e0e0;
}

.steps-container h3 {
  color: #1565c0;
  margin-bottom: 15px;
}

.step-input {
  display: flex;
  align-items: flex-start;
  gap: 15px;
  margin-bottom: 15px;
  padding: 15px;
  background: #f8f9fa;
  border-radius: 8px;
  border-left: 4px solid #1565c0;
}

.step-number {
  background: #1565c0;
  color: white;
  width: 35px;
  height: 35px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: 18px;
  flex-shrink: 0;
}

.step-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.step-content label {
  font-weight: 600;
  color: #1a1a1a;
  margin-bottom: 3px;
}

.step-formula {
  font-size: 14px;
}

.step-delta-h {
  width: 120px;
}

.result-section {
  margin: 20px 0;
}

.btn {
  padding: 10px 20px;
  font-size: 16px;
  font-weight: 600;
  transition: all 0.3s;
  cursor: pointer;
  border-radius: 5px;
  border: none;
  display: inline-block;
}

.btn-primary {
  background: #1565c0;
  color: #ffffff;
}

.btn-primary:hover {
  background: #0d47a1;
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.btn-primary:focus-visible {
  outline: 3px solid #ffc107;
  outline-offset: 2px;
}

.btn-success {
  background: #28a745;
  color: white;
}

.btn-success:hover {
  background: #218838;
}

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

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

.btn-lg {
  padding: 15px 30px;
  font-size: 18px;
}

.btn-block {
  width: 100%;
  display: block;
}

.result-panel {
  margin-top: 30px;
  padding: 20px;
  background: #e3f2fd;
  border-left: 5px solid #1565c0;
  border-radius: 8px;
  border: 2px solid #90caf9;
  animation: slideIn 0.3s ease-out;
}

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

.result-panel h3 {
  color: #1565c0;
  margin-top: 0;
  margin-bottom: 15px;
}

.calculation-display {
  background: white;
  padding: 15px;
  border-radius: 8px;
  margin: 15px 0;
  border: 2px solid #e0e0e0;
}

.calculation-row {
  text-align: center;
  margin-bottom: 15px;
  padding-bottom: 15px;
  border-bottom: 2px solid #e0e0e0;
}

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

.formula {
  font-family: 'Courier New', monospace;
  font-size: 1.1em;
  font-weight: bold;
  color: #1565c0;
  background: #f8f9fa;
  padding: 10px 15px;
  border-radius: 5px;
  display: inline-block;
  border: 2px solid #1565c0;
  margin: 10px 0;
}

.calculation-details {
  font-size: 1.2em;
  color: #1a1a1a;
  text-align: center;
  margin: 15px 0;
  font-weight: 600;
}

.final-result {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding-top: 15px;
  border-top: 2px solid #e0e0e0;
}

.final-result .label {
  font-weight: 600;
  color: #1a1a1a;
  font-size: 1.1em;
}

.final-result .value {
  font-size: 2em;
  color: #1565c0;
  font-weight: 700;
}

.final-result .value.large {
  font-size: 2.5em;
  color: #e74c3c;
}

.final-result .value.highlight {
  text-shadow: 0 2px 4px rgba(231, 76, 60, 0.3);
}

.path-selector {
  background: white;
  padding: 20px;
  border-radius: 8px;
  margin-bottom: 15px;
  border: 2px solid #e0e0e0;
}

.path-selector h3 {
  color: #1565c0;
  margin-bottom: 15px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.path-steps {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.path-selector .path-step {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.path-selector .path-step label {
  font-weight: 600;
  color: #1a1a1a;
  flex: 1;
}

.path-selector .path-step input {
  flex: 2;
  font-size: 14px;
}

.enthalpy-inputs {
  background: white;
  padding: 20px;
  border-radius: 8px;
  margin: 20px 0;
  border: 2px solid #e0e0e0;
}

.path-enthalpies h4 {
  color: #1565c0;
  margin-bottom: 10px;
}

.enthalpy-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.enthalpy-row label {
  font-weight: 600;
  color: #1a1a1a;
  min-width: 40px;
}

.enthalpy-row input {
  flex: 1;
}

.enthalpy-total {
  text-align: right;
  padding-top: 10px;
  border-top: 2px solid #e0e0e0;
  font-weight: 700;
  color: #1565c0;
}

.comparison-display {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 20px;
}

.path-comparison {
  background: white;
  padding: 20px;
  border-radius: 8px;
  border: 2px solid #e0e0e0;
}

.path-comparison h4 {
  color: #1565c0;
  margin-bottom: 10px;
}

.path-details {
  min-height: 80px;
}

.path-details .formula {
  font-size: 1em;
  margin-bottom: 10px;
}

.path-details p {
  color: #1a1a1a;
  margin: 10px 0;
}

.conclusion {
  grid-column: 1 / -1;
  margin-top: 20px;
}

.elements-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 15px;
}

.element-checkbox {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px;
  background: #f8f9fa;
  border-radius: 5px;
  border: 2px solid #e0e0e0;
}

.element-checkbox input[type='checkbox'] {
  width: 20px;
  height: 20px;
  cursor: pointer;
}

.element-checkbox input[type='checkbox']:focus {
  outline: 3px solid #ffc107;
  outline-offset: 2px;
}

.element-checkbox label {
  flex: 1;
  cursor: pointer;
  font-weight: 600;
  color: #1a1a1a;
}

.formation-enthalpy {
  font-size: 0.9em;
  color: #666;
  margin-left: 5px;
}

.calculation-method {
  background: white;
  padding: 20px;
  border-radius: 8px;
  margin: 20px 0;
  border: 2px solid #e0e0e0;
}

.calculation-method h3 {
  color: #1565c0;
  margin-bottom: 15px;
}

.formula-box {
  text-align: center;
}

.formation-display {
  background: white;
  padding: 20px;
  border-radius: 8px;
  border: 2px solid #e0e0e0;
  margin: 20px 0;
}

.calculation-steps {
  margin-bottom: 20px;
}

.calculation-steps h4 {
  color: #1565c0;
  margin-bottom: 10px;
}

.calculation-steps p {
  color: #1a1a1a;
  margin: 8px 0;
  font-family: 'Courier New', monospace;
  font-size: 0.95em;
}

.reaction-type {
  text-align: center;
  margin-top: 15px;
}

.badge {
  padding: 8px 16px;
  border-radius: 20px;
  font-weight: bold;
  text-transform: uppercase;
  font-size: 0.9em;
}

.badge.exothermic {
  background: #28a745;
  color: white;
}

.badge.endothermic {
  background: #dc3545;
  color: white;
}

.badge.neutral {
  background: #6c757d;
  color: white;
}

.educational-content {
  margin: 40px 0;
}

.educational-content h2 {
  text-align: center;
  color: #1a1a1a;
  margin-bottom: 30px;
}

.info-card {
  background: #f8f9fa;
  padding: 20px;
  border-radius: 10px;
  margin-bottom: 20px;
  border-left: 5px solid #2e7d32;
  border: 2px solid #e0e0e0;
  height: 100%;
}

.info-card h3 {
  color: #2e7d32;
  margin-bottom: 15px;
}

.info-card h4,
.info-card h5 {
  color: #1565c0;
  margin-top: 0;
  margin-bottom: 10px;
}

.info-card p {
  margin: 10px 0;
  color: #1a1a1a;
  line-height: 1.6;
}

.info-card ul,
.info-card ol {
  margin: 15px 0;
  padding-left: 20px;
  line-height: 1.6;
}

.info-card li {
  margin: 8px 0;
  color: #1a1a1a;
}

.info-card .formula-text {
  font-size: 1em;
  margin: 15px 0;
  background: #e3f2fd;
  border-color: #90caf9;
}

.example-card {
  background: white;
  padding: 20px;
  border-radius: 10px;
  margin-bottom: 20px;
  border-left: 5px solid #1565c0;
  border: 2px solid #e0e0e0;
}

.example-card h3 {
  color: #1565c0;
  margin-bottom: 15px;
}

.reaction-examples {
  margin-top: 20px;
}

.reaction-examples h4 {
  color: #1565c0;
  margin-bottom: 15px;
}

.reaction-path {
  background: #f8f9fa;
  padding: 15px;
  border-radius: 8px;
  margin-bottom: 15px;
  border: 2px solid #e0e0e0;
}

.reaction-path .path-step {
  padding: 8px;
  margin-bottom: 8px;
  border-bottom: 1px solid #e0e0e0;
}

.reaction-path .path-step:last-child {
  border-bottom: none;
}

.enthalpy-value {
  text-align: right;
  font-weight: 600;
  color: #1565c0;
  margin-top: 10px;
}

.reaction-path .enthalpy-total {
  text-align: center;
  font-weight: 700;
  color: #e74c3c;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 2px solid #e0e0e0;
}

.reaction-path .conclusion {
  padding: 15px;
  margin-top: 15px;
  background: white;
  border-radius: 8px;
  border: 2px solid #e0e0e0;
}

.text-success {
  color: #28a745;
  font-weight: 600;
}

.table {
  background: white;
  border-radius: 5px;
  overflow: hidden;
  border: 2px solid #e0e0e0;
  width: 100%;
  margin-top: 15px;
}

.table thead {
  background: #1565c0;
  color: white;
}

.table th {
  font-weight: 600;
  padding: 12px;
  border: 2px solid #0d47a1;
  text-align: left;
}

.table td {
  padding: 10px 12px;
  border-top: 2px solid #e0e0e0;
  color: #1a1a1a;
}

.table-striped tbody tr:nth-of-type(odd) {
  background: rgba(21, 101, 192, 0.05);
}

.table tbody tr:hover {
  background: rgba(21, 101, 192, 0.1);
}

.table tbody tr:focus {
  outline: 2px solid #1565c0;
  outline-offset: -2px;
}

.small {
  font-size: 0.9em;
  color: #666;
}

.sub {
  vertical-align: sub;
  font-size: 0.7em;
}

.alert {
  padding: 15px 20px;
  border-radius: 8px;
  margin: 15px 0;
  border: 2px solid;
}

.alert-info {
  background: #d1ecf1;
  border-color: #bee5eb;
  color: #0c5460;
}

.alert-success {
  background: #d4edda;
  border-color: #c3e6cb;
  color: #155724;
}

.alert-warning {
  background: #fff3cd;
  border-color: #ffeaa7;
  color: #856404;
}

.alert h4 {
  margin-top: 0;
  margin-bottom: 10px;
}

.alert p,
.alert ul {
  margin: 8px 0;
  color: inherit;
}

.alert li {
  margin: 5px 0;
}

@media (max-width: 768px) {
  .hess-gesetz-container {
    padding: 10px;
  }

  .calculator-panel,
  .info-card,
  .example-card {
    padding: 15px;
  }

  .comparison-display {
    grid-template-columns: 1fr;
  }

  .elements-grid {
    grid-template-columns: 1fr;
  }

  .reaction-examples {
    grid-template-columns: 1fr;
  }
}

@media (prefers-color-scheme: dark) {
  .hess-gesetz-container {
    color: #e0e0e0;
  }

  .calculator-panel,
  .info-card {
    background: #1a1a1a;
    border-color: #404040;
  }

  .calculator-panel h2,
  .educational-content h2 {
    color: #e0e0e0;
  }

  .form-group label {
    color: #e0e0e0;
  }

  .form-control {
    background: #2c2c2c;
    color: #e0e0e0;
    border-color: #555;
  }

  .steps-container,
  .path-selector,
  .enthalpy-inputs,
  .calculation-method,
  .formation-display {
    background: #1a1a1a;
    border-color: #404040;
  }

  .steps-container h3,
  .path-selector h3,
  .calculation-method h3 {
    color: #64b5f6;
  }

  .step-input {
    background: #2c2c2c;
    border-left-color: #64b5f6;
  }

  .result-panel {
    background: #1a3c5e;
    border-left-color: #64b5f6;
    border-color: #0d47a1;
  }

  .result-panel h3 {
    color: #64b5f6;
  }

  .calculation-display,
  .reaction-path {
    background: #2c2c2c;
    border-color: #404040;
  }

  .formula {
    background: #2c2c2c;
    color: #64b5f6;
    border-color: #0d47a1;
  }

  .calculation-details,
  .path-details p,
  .calculation-steps p {
    color: #e0e0e0;
  }

  .final-result .label {
    color: #c0c0c0;
  }

  .final-result .value {
    color: #64b5f6;
  }

  .final-result .value.highlight {
    text-shadow: 0 2px 4px rgba(255, 107, 107, 0.3);
  }

  .path-comparison {
    background: #1a1a1a;
    border-color: #404040;
  }

  .path-comparison h4 {
    color: #64b5f6;
  }

  .path-details .formula {
    background: #2c2c2c;
    color: #64b5f6;
    border-color: #0d47a1;
  }

  .example-card,
  .conclusion {
    background: #1a1a1a;
    border-color: #404040;
  }

  .example-card h3 {
    color: #64b5f6;
  }

  .reaction-path {
    background: #2c2c2c;
    border-color: #404040;
  }

  .enthalpy-value {
    color: #64b5f6;
  }

  .enthalpy-total {
    color: #ff6b6b;
  }

  .element-checkbox {
    background: #2c2c2c;
    border-color: #404040;
  }

  .element-checkbox label {
    color: #e0e0e0;
  }

  .formation-enthalpy {
    color: #999;
  }

  .table {
    background: #1a1a1a;
    border-color: #404040;
    color: #e0e0e0;
  }

  .table thead {
    background: #0d47a1;
  }

  .table th {
    border-color: #0d47a1;
  }

  .table td {
    border-color: #404040;
    color: #e0e0e0;
  }

  .table-striped tbody tr:nth-of-type(odd) {
    background: rgba(100, 181, 246, 0.1);
  }

  .table tbody tr:hover {
    background: rgba(100, 181, 246, 0.15);
  }

  .alert-info {
    background: #1a3c5e;
    border-color: #0d47a1;
    color: #b8daff;
  }

  .alert-success {
    background: #1a3c5e;
    border-color: #0d47a1;
    color: #90caf9;
  }

  .alert-warning {
    background: #1a3c5e;
    border-color: #0d47a1;
    color: #ffc107;
  }

  .text-success {
    color: #90caf9;
  }
}