/* ========================================
   Perceptron/Neuron Visualization Styles
   ======================================== */

/* CSS Variables */
.perceptron-container {
  --pc-primary: #2563eb;
  --pc-secondary: #1e40af;
  --pc-accent: #8b5cf6;
  --pc-success: #10b981;
  --pc-warning: #f59e0b;
  --pc-danger: #ef4444;
  --pc-info: #06b6d4;
  --pc-light: #f8fafc;
  --pc-dark: #1e293b;
  --pc-text: #334155;
  --pc-text-light: #64748b;
  --pc-bg: #ffffff;
  --pc-border: #e2e8f0;
  --pc-shadow: rgba(0, 0, 0, 0.1);
  --pc-radius: 12px;
  --pc-radius-sm: 8px;
  --pc-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Base Container */
.perceptron-container {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
  line-height: 1.6;
  color: var(--pc-text);
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px;
  background: var(--pc-bg);
  border-radius: var(--pc-radius);
  box-shadow: 0 4px 6px var(--pc-shadow);
}

/* Header */
.perceptron-container header {
  text-align: center;
  margin-bottom: 30px;
  padding: 40px 20px;
  background: linear-gradient(135deg, var(--pc-primary) 0%, var(--pc-accent) 100%);
  color: white;
  border-radius: var(--pc-radius);
  position: relative;
  overflow: hidden;
}

.perceptron-container header::before {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  bottom: 0;
  width: 40%;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'%3E%3Ccircle cx='20' cy='50' r='8' fill='rgba(255,255,255,0.1)'/%3E%3Ccircle cx='50' cy='30' r='8' fill='rgba(255,255,255,0.1)'/%3E%3Ccircle cx='50' cy='70' r='8' fill='rgba(255,255,255,0.1)'/%3E%3Ccircle cx='80' cy='50' r='12' fill='rgba(255,255,255,0.15)'/%3E%3Cline x1='28' y1='50' x2='42' y2='35' stroke='rgba(255,255,255,0.1)' stroke-width='2'/%3E%3Cline x1='28' y1='50' x2='42' y2='65' stroke='rgba(255,255,255,0.1)' stroke-width='2'/%3E%3Cline x1='58' y1='35' x2='68' y2='50' stroke='rgba(255,255,255,0.1)' stroke-width='2'/%3E%3Cline x1='58' y1='65' x2='68' y2='50' stroke='rgba(255,255,255,0.1)' stroke-width='2'/%3E%3C/svg%3E") no-repeat center;
  opacity: 0.5;
}

.perceptron-container header h1 {
  margin: 0 0 10px 0;
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  position: relative;
  z-index: 1;
}

.perceptron-container header .subtitle {
  margin: 5px 0;
  font-size: 1.2rem;
  opacity: 0.95;
  font-weight: 300;
  position: relative;
  z-index: 1;
}

.perceptron-container header .author {
  font-size: 0.9rem;
  opacity: 0.8;
  margin-top: 10px;
  position: relative;
  z-index: 1;
}

/* Navigation Tabs */
.perceptron-container .viz-tabs {
  display: flex;
  gap: 10px;
  margin-bottom: 30px;
  flex-wrap: wrap;
  justify-content: center;
}

.perceptron-container .tab-btn {
  padding: 12px 20px;
  border: 2px solid var(--pc-border);
  background: var(--pc-bg);
  color: var(--pc-text);
  border-radius: var(--pc-radius-sm);
  cursor: pointer;
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--pc-transition);
  flex: 1;
  min-width: 100px;
  max-width: 150px;
}

.perceptron-container .tab-btn:hover {
  background: var(--pc-light);
  border-color: var(--pc-primary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px var(--pc-shadow);
}

.perceptron-container .tab-btn.active {
  background: var(--pc-primary);
  color: white;
  border-color: var(--pc-primary);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

/* Tab Content */
.perceptron-container .tab-content {
  min-height: 500px;
  display: none;
  animation: pcFadeIn 0.3s ease-in-out;
}

.perceptron-container .tab-content.active {
  display: block;
}

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

/* Content Layout */
.perceptron-container .viz-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
  margin-bottom: 30px;
}

.perceptron-container .viz-layout-full {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 30px;
  margin-bottom: 30px;
}

@media (max-width: 1024px) {
  .perceptron-container .viz-layout,
  .perceptron-container .viz-layout-full {
    grid-template-columns: 1fr;
  }
}

/* Canvas Wrapper */
.perceptron-container .canvas-wrapper {
  background: var(--pc-light);
  border-radius: var(--pc-radius);
  padding: 20px;
  position: relative;
}

.perceptron-container .canvas-wrapper.large {
  min-height: 500px;
}

.perceptron-container .canvas-wrapper canvas {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--pc-radius-sm);
  background: white;
}

/* Controls Panel */
.perceptron-container .controls-panel {
  background: var(--pc-light);
  padding: 25px;
  border-radius: var(--pc-radius);
  border-left: 4px solid var(--pc-primary);
}

.perceptron-container .controls-panel h3 {
  margin: 0 0 15px 0;
  color: var(--pc-dark);
  font-size: 1.4rem;
  font-weight: 600;
}

.perceptron-container .controls-panel h4 {
  margin: 20px 0 10px 0;
  color: var(--pc-secondary);
  font-size: 1.1rem;
  font-weight: 600;
}

.perceptron-container .controls-panel p {
  margin-bottom: 15px;
  line-height: 1.7;
  color: var(--pc-text);
}

.perceptron-container .panel-desc {
  margin-bottom: 20px;
  line-height: 1.7;
  color: var(--pc-text-light);
  font-style: italic;
}

/* Formula Display */
.perceptron-container .formula-display {
  background: white;
  padding: 15px 20px;
  border-radius: var(--pc-radius-sm);
  margin: 15px 0;
  border: 1px solid var(--pc-border);
}

.perceptron-container .formula-row {
  display: flex;
  align-items: center;
  gap: 15px;
  margin: 10px 0;
}

.perceptron-container .formula-label {
  color: var(--pc-text-light);
  font-size: 0.9rem;
  min-width: 100px;
}

.perceptron-container .formula-text {
  font-family: 'Courier New', monospace;
  font-size: 1.1rem;
  color: var(--pc-primary);
  font-weight: 600;
}

/* Slider Controls */
.perceptron-container .slider-group {
  margin: 12px 0;
}

.perceptron-container .slider-group label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 5px;
  font-size: 0.9rem;
  color: var(--pc-text);
}

.perceptron-container .slider-group label span {
  font-weight: 600;
  color: var(--pc-primary);
  min-width: 50px;
  text-align: right;
}

.perceptron-container .slider-group input[type="range"] {
  width: 100%;
  height: 6px;
  border-radius: 3px;
  background: var(--pc-border);
  outline: none;
  -webkit-appearance: none;
}

.perceptron-container .slider-group input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--pc-primary);
  cursor: pointer;
  transition: var(--pc-transition);
}

.perceptron-container .slider-group input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  box-shadow: 0 0 10px rgba(37, 99, 235, 0.5);
}

/* Select Control */
.perceptron-container .activation-select select,
.perceptron-container .target-function select {
  width: 100%;
  padding: 10px 15px;
  border: 2px solid var(--pc-border);
  border-radius: var(--pc-radius-sm);
  background: white;
  font-size: 1rem;
  color: var(--pc-text);
  cursor: pointer;
  transition: var(--pc-transition);
}

.perceptron-container .activation-select select:hover,
.perceptron-container .target-function select:hover {
  border-color: var(--pc-primary);
}

.perceptron-container .activation-select select:focus,
.perceptron-container .target-function select:focus {
  outline: none;
  border-color: var(--pc-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

/* Output Display */
.perceptron-container .output-display {
  background: white;
  padding: 15px 20px;
  border-radius: var(--pc-radius-sm);
  margin-top: 20px;
  border: 2px solid var(--pc-primary);
}

.perceptron-container .computation-step {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
  border-bottom: 1px solid var(--pc-border);
}

.perceptron-container .computation-step:last-child {
  border-bottom: none;
}

.perceptron-container .computation-step span:first-child {
  color: var(--pc-text-light);
}

.perceptron-container .computation-step span:last-child {
  font-weight: 600;
  font-size: 1.1rem;
  color: var(--pc-primary);
}

/* Key Insight Box */
.perceptron-container .key-insight {
  background: linear-gradient(135deg, var(--pc-warning) 0%, #f97316 100%);
  color: white;
  padding: 20px;
  border-radius: var(--pc-radius-sm);
  margin: 15px 0;
}

.perceptron-container .key-insight h4 {
  color: white;
  margin-top: 0;
}

.perceptron-container .key-insight p {
  color: white;
  margin: 10px 0;
  font-weight: 600;
}

.perceptron-container .key-insight .formula-text {
  color: white;
  font-size: 1rem;
}

/* Purposes List */
.perceptron-container .purposes-list {
  margin: 20px 0;
}

.perceptron-container .purpose-item {
  display: flex;
  align-items: center;
  gap: 15px;
  padding: 12px 15px;
  background: white;
  border-radius: var(--pc-radius-sm);
  margin: 10px 0;
  border-left: 3px solid var(--pc-primary);
}

.perceptron-container .purpose-num {
  width: 30px;
  height: 30px;
  background: var(--pc-primary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  flex-shrink: 0;
}

/* Timeline */
.perceptron-container .timeline {
  margin: 15px 0;
}

.perceptron-container .timeline-item {
  display: flex;
  gap: 15px;
  padding: 10px 0;
  border-left: 3px solid var(--pc-border);
  padding-left: 15px;
  margin-left: 10px;
  position: relative;
}

.perceptron-container .timeline-item::before {
  content: "";
  position: absolute;
  left: -8px;
  top: 50%;
  transform: translateY(-50%);
  width: 12px;
  height: 12px;
  background: var(--pc-primary);
  border-radius: 50%;
}

.perceptron-container .timeline-item .year {
  font-weight: 600;
  color: var(--pc-primary);
  min-width: 60px;
}

/* Function Selector */
.perceptron-container .function-selector {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 15px 0;
}

.perceptron-container .func-btn {
  padding: 8px 16px;
  border: 2px solid var(--pc-border);
  background: white;
  color: var(--pc-text);
  border-radius: var(--pc-radius-sm);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--pc-transition);
}

.perceptron-container .func-btn:hover {
  border-color: var(--pc-accent);
  background: var(--pc-light);
}

.perceptron-container .func-btn.active {
  background: var(--pc-accent);
  color: white;
  border-color: var(--pc-accent);
}

/* Function Info */
.perceptron-container .function-info {
  background: white;
  padding: 20px;
  border-radius: var(--pc-radius-sm);
  margin: 15px 0;
  border: 1px solid var(--pc-border);
}

.perceptron-container .info-section {
  display: flex;
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px solid var(--pc-border);
}

.perceptron-container .info-section:last-child {
  border-bottom: none;
}

.perceptron-container .info-label {
  color: var(--pc-text-light);
  min-width: 100px;
  flex-shrink: 0;
}

.perceptron-container .info-value {
  color: var(--pc-text);
  font-family: 'Courier New', monospace;
}

/* Real-time Calculator */
.perceptron-container .realtime-calculator {
  background: white;
  padding: 20px;
  border-radius: var(--pc-radius-sm);
  margin: 15px 0;
  border: 2px solid var(--pc-info);
}

.perceptron-container .calc-results {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
  margin-top: 15px;
}

.perceptron-container .calc-item {
  display: flex;
  justify-content: space-between;
  padding: 8px 12px;
  background: var(--pc-light);
  border-radius: var(--pc-radius-sm);
}

.perceptron-container .calc-item .func-name {
  color: var(--pc-text-light);
  font-size: 0.85rem;
}

.perceptron-container .calc-item .func-value {
  font-weight: 600;
  color: var(--pc-primary);
}

/* Gradient Table */
.perceptron-container .gradient-table {
  margin: 15px 0;
}

.perceptron-container .gradient-table table {
  width: 100%;
  border-collapse: collapse;
  background: white;
  border-radius: var(--pc-radius-sm);
  overflow: hidden;
}

.perceptron-container .gradient-table th,
.perceptron-container .gradient-table td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid var(--pc-border);
}

.perceptron-container .gradient-table th {
  background: var(--pc-dark);
  color: white;
  font-weight: 600;
}

.perceptron-container .gradient-table td.good {
  color: var(--pc-success);
  font-weight: 500;
}

.perceptron-container .gradient-table td.bad {
  color: var(--pc-danger);
  font-weight: 500;
}

.perceptron-container .gradient-table td.warn {
  color: var(--pc-warning);
  font-weight: 500;
}

/* Gradient Formula */
.perceptron-container .gradient-formula {
  background: linear-gradient(135deg, var(--pc-danger) 0%, #dc2626 100%);
  color: white;
  padding: 20px;
  border-radius: var(--pc-radius-sm);
  margin: 15px 0;
}

.perceptron-container .gradient-formula h4 {
  color: white;
  margin-top: 0;
}

.perceptron-container .gradient-formula .formula-text {
  color: white;
}

.perceptron-container .gradient-formula .formula-note {
  margin-top: 10px;
  font-size: 0.9rem;
  opacity: 0.9;
}

/* Expressiveness */
.perceptron-container .expressiveness {
  background: white;
  padding: 15px 20px;
  border-radius: var(--pc-radius-sm);
  margin: 15px 0;
}

.perceptron-container .express-item {
  display: flex;
  gap: 10px;
  padding: 8px 0;
}

.perceptron-container .expr-type {
  font-weight: 600;
  color: var(--pc-primary);
  min-width: 100px;
}

/* Toggle Buttons */
.perceptron-container .toggle-buttons {
  display: flex;
  gap: 10px;
  margin-top: 10px;
}

.perceptron-container .toggle-btn {
  flex: 1;
  padding: 10px 15px;
  border: 2px solid var(--pc-border);
  background: white;
  color: var(--pc-text);
  border-radius: var(--pc-radius-sm);
  cursor: pointer;
  font-size: 0.9rem;
  transition: var(--pc-transition);
}

.perceptron-container .toggle-btn:hover {
  border-color: var(--pc-primary);
}

.perceptron-container .toggle-btn.active {
  background: var(--pc-primary);
  color: white;
  border-color: var(--pc-primary);
}

/* Theorem Box */
.perceptron-container .theorem-box {
  background: linear-gradient(135deg, var(--pc-success) 0%, #059669 100%);
  color: white;
  padding: 20px;
  border-radius: var(--pc-radius-sm);
  margin: 15px 0;
}

.perceptron-container .theorem-box h4 {
  color: white;
  margin-top: 0;
}

.perceptron-container .theorem-box p {
  color: white;
  margin: 10px 0 0 0;
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Guide Layout */
.perceptron-container .guide-layout {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 30px;
}

.perceptron-container .guide-section {
  background: var(--pc-light);
  padding: 20px;
  border-radius: var(--pc-radius);
  border-left: 4px solid var(--pc-primary);
}

.perceptron-container .guide-section.full-width {
  grid-column: 1 / -1;
}

.perceptron-container .guide-section h3 {
  margin: 0 0 15px 0;
  color: var(--pc-dark);
  font-size: 1.2rem;
}

@media (max-width: 768px) {
  .perceptron-container .guide-layout {
    grid-template-columns: 1fr;
  }
}

/* Guide Card */
.perceptron-container .guide-card {
  background: white;
  padding: 15px;
  border-radius: var(--pc-radius-sm);
}

.perceptron-container .recommendation {
  display: flex;
  justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px solid var(--pc-border);
}

.perceptron-container .recommendation:last-child {
  border-bottom: none;
}

.perceptron-container .rec-label {
  color: var(--pc-text-light);
}

.perceptron-container .rec-value {
  font-weight: 600;
  color: var(--pc-primary);
}

/* Guide Table */
.perceptron-container .guide-table {
  width: 100%;
  border-collapse: collapse;
  background: white;
  border-radius: var(--pc-radius-sm);
  overflow: hidden;
}

.perceptron-container .guide-table th,
.perceptron-container .guide-table td {
  padding: 12px;
  text-align: left;
  border-bottom: 1px solid var(--pc-border);
}

.perceptron-container .guide-table th {
  background: var(--pc-primary);
  color: white;
}

/* Init Pairs */
.perceptron-container .init-pairs {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.perceptron-container .init-pair {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 15px;
  background: white;
  border-radius: var(--pc-radius-sm);
}

.perceptron-container .init-act {
  font-weight: 600;
  color: var(--pc-accent);
  min-width: 100px;
}

.perceptron-container .arrow {
  color: var(--pc-text-light);
}

.perceptron-container .init-method {
  color: var(--pc-text);
}

/* Technique List */
.perceptron-container .technique-list {
  margin: 0;
  padding-left: 20px;
}

.perceptron-container .technique-list li {
  padding: 8px 0;
  color: var(--pc-text);
}

/* Concept Grid */
.perceptron-container .concept-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 15px;
  margin-bottom: 20px;
}

@media (max-width: 768px) {
  .perceptron-container .concept-grid {
    grid-template-columns: 1fr;
  }
}

.perceptron-container .concept-card {
  background: white;
  padding: 15px;
  border-radius: var(--pc-radius-sm);
  text-align: center;
  border: 2px solid var(--pc-border);
}

.perceptron-container .concept-card h4 {
  color: var(--pc-primary);
  margin: 0 0 8px 0;
}

.perceptron-container .concept-card p {
  margin: 0;
  color: var(--pc-text-light);
  font-size: 0.9rem;
}

.perceptron-container .unified-view {
  background: linear-gradient(135deg, var(--pc-accent) 0%, #7c3aed 100%);
  color: white;
  padding: 20px;
  border-radius: var(--pc-radius-sm);
  text-align: center;
}

.perceptron-container .unified-view p {
  color: white;
  margin: 0;
  font-size: 1.1rem;
  font-weight: 500;
}

/* Summary */
.perceptron-container .summary {
  background: linear-gradient(135deg, var(--pc-dark) 0%, var(--pc-secondary) 100%);
  color: white;
}

.perceptron-container .summary h3 {
  color: white;
}

.perceptron-container .summary-points p {
  color: white;
  padding: 10px 0;
  margin: 5px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
  font-size: 1.05rem;
}

.perceptron-container .summary-points p:last-child {
  border-bottom: none;
}

/* Footer */
.perceptron-container .quote-section {
  text-align: center;
  padding: 30px 20px;
  margin-top: 40px;
  border-top: 2px solid var(--pc-border);
  color: var(--pc-text-light);
}

.perceptron-container .quote-section blockquote {
  font-size: 1.3rem;
  font-style: italic;
  margin: 0 0 10px 0;
  color: var(--pc-primary);
  line-height: 1.8;
}

.perceptron-container .quote-section cite {
  font-style: normal;
  color: var(--pc-text-light);
}

/* Responsive Design */
@media (max-width: 768px) {
  .perceptron-container {
    padding: 15px;
  }

  .perceptron-container header h1 {
    font-size: 1.8rem;
  }

  .perceptron-container header .subtitle {
    font-size: 1rem;
  }

  .perceptron-container .viz-tabs {
    flex-direction: column;
  }

  .perceptron-container .tab-btn {
    max-width: none;
    min-width: auto;
  }

  .perceptron-container .controls-panel {
    padding: 15px;
  }

  .perceptron-container .controls-panel h3 {
    font-size: 1.2rem;
  }

  .perceptron-container .calc-results {
    grid-template-columns: 1fr;
  }

  .perceptron-container header::before {
    display: none;
  }
}

/* Print Styles */
@media print {
  .perceptron-container .viz-tabs {
    display: none;
  }

  .perceptron-container {
    box-shadow: none;
    border: 1px solid #ddd;
  }
}

/* Accessibility */
.perceptron-container .tab-btn:focus,
.perceptron-container .func-btn:focus,
.perceptron-container .toggle-btn:focus {
  outline: 2px solid var(--pc-info);
  outline-offset: 2px;
}

/* Animations */
@keyframes pcPulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.7;
  }
}

.perceptron-container .pc-pulse {
  animation: pcPulse 2s ease-in-out infinite;
}

/* Utility Classes */
.perceptron-container .text-center {
  text-align: center;
}

.perceptron-container .mt-2 {
  margin-top: 20px;
}

.perceptron-container .mb-2 {
  margin-bottom: 20px;
}