/* COMPREHENSIVE ELECTRIC CURRENT PAGE - ULTRA RESPONSIVE & FAST */
/* Using the same optimized CSS framework as Power Electronics page */
:root {
  /* Primary Color Scheme - Electric Blue Theme */
  --primary: #1e90ff;
  --secondary: #4169e1;
  --accent: #00bfff;
  --success: #228b22;
  --warning: #ff8c00;
  --danger: #dc143c;
  --dark: #2c3e50;
  --light: #f0f8ff;
  
  /* Background and Surface Colors */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fbff;
  --bg-tertiary: #f0f8ff;
  --surface: #ffffff;
  --surface-elevated: #f8f9fa;
  
  /* Text Colors */
  --text-primary: #2c3e50;
  --text-secondary: #6c757d;
  --text-muted: #95a5a6;
  --text-inverse: #ffffff;
  
  /* Border and Shadow */
  --border: rgba(30, 144, 255, 0.1);
  --border-light: rgba(30, 144, 255, 0.05);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.1);
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #1e90ff 0%, #4169e1 100%);
  --gradient-secondary: linear-gradient(135deg, #4169e1 0%, #6495ed 100%);
  --gradient-accent: linear-gradient(135deg, #00bfff 0%, #87ceeb 100%);
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  
  /* Typography */
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  
  /* Transitions */
  --transition-fast: 0.15s ease-in-out;
  --transition-normal: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;
  
  /* Layout */
  --container-max-width: 1200px;
  --container-padding: 1rem;
  --section-padding: 2rem 0;
  --hero-height: 60vh;
  
  /* Interactive Elements */
  --button-radius: 0.5rem;
  --card-radius: 1rem;
  --input-radius: 0.375rem;
}

/* Dark Theme Variables */
[data-theme="dark"] {
  --primary: #87ceeb;
  --secondary: #6495ed;
  --accent: #87cefa;
  --success: #00ff7f;
  --warning: #ffa500;
  --danger: #ff6347;
  
  --bg-primary: #1a1a1a;
  --bg-secondary: #2d2d2d;
  --bg-tertiary: #3d3d3d;
  --surface: #2d2d2d;
  --surface-elevated: #3d3d3d;
  
  --text-primary: #f5f5f5;
  --text-secondary: #b0b0b0;
  --text-muted: #6c757d;
  --text-inverse: #1a1a1a;
  
  --border: rgba(135, 206, 235, 0.2);
  --border-light: rgba(135, 206, 235, 0.1);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.6);
  
  --gradient-primary: linear-gradient(135deg, #87ceeb 0%, #6495ed 100%);
  --gradient-secondary: linear-gradient(135deg, #6495ed 0%, #4682b4 100%);
  --gradient-accent: linear-gradient(135deg, #87cefa 0%, #5f9ea0 100%);
}

/* Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  line-height: 1.6;
}

body {
  font-family: 'Inter', sans-serif;
  color: var(--text-primary);
  background: var(--bg-primary);
  transition: background-color var(--transition-normal), color var(--transition-normal);
  overflow-x: hidden;
}

/* Container System */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
  width: 100%;
}

/* Progress Bar */
.progress-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: rgba(0, 0, 0, 0.1);
  z-index: 9999;
  backdrop-filter: blur(10px);
}

.progress-bar {
  height: 100%;
  background: var(--gradient-primary);
  width: 0%;
  transition: width 0.1s ease;
  box-shadow: 0 0 10px rgba(30, 144, 255, 0.5);
}

/* Theme Toggle */
.theme-toggle {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--gradient-primary);
  color: var(--text-inverse);
  border: none;
  box-shadow: var(--shadow-xl);
  cursor: pointer;
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  z-index: 1000;
}

.theme-toggle:hover {
  transform: scale(1.1);
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.25);
}

.theme-toggle:active {
  transform: scale(0.95);
}

.theme-icon {
  transition: all var(--transition-normal);
}

.theme-toggle .sun-icon {
  display: none;
}

.theme-toggle .moon-icon {
  display: block;
}

[data-theme="dark"] .theme-toggle .sun-icon {
  display: block;
}

[data-theme="dark"] .theme-toggle .moon-icon {
  display: none;
}



/* Hero Section */
.hero-section {
  background: var(--gradient-primary);
  color: var(--text-inverse);
  padding: var(--space-3xl) 0;
  position: relative;
  overflow: hidden;
  min-height: var(--hero-height);
  display: flex;
  align-items: center;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 20"><defs><radialGradient id="a" cx="50" cy="50" r="50"><stop offset="0" stop-color="rgba(255,255,255,.1)"/><stop offset="100" stop-color="rgba(255,255,255,0)"/></radialGradient></defs><rect width="100" height="20" fill="url(%23a)"/></svg>') repeat;
  opacity: 0.1;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  width: 100%;
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 700;
  margin-bottom: var(--space-lg);
  text-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
  line-height: 1.1;
}

.hero-subtitle {
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  opacity: 0.9;
  margin-bottom: var(--space-2xl);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

/* Table of Contents */
.toc-container {
  background: var(--surface);
  border-radius: var(--card-radius);
  padding: var(--space-2xl);
  margin: var(--space-2xl) 0;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
  position: sticky;
  top: 80px;
  z-index: 100;
}

.toc-header {
  text-align: center;
  margin-bottom: var(--space-xl);
  color: var(--text-primary);
}

.toc-header i {
  color: var(--primary);
  font-size: 2rem;
  margin-right: var(--space-sm);
}

.toc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
  margin-top: var(--space-xl);
}

.toc-item {
  padding: var(--space-lg);
  border-radius: var(--card-radius);
  background: var(--bg-secondary);
  border-left: 4px solid var(--primary);
  transition: all var(--transition-normal);
  cursor: pointer;
  min-height: 80px;
  display: flex;
  align-items: center;
  text-decoration: none;
  color: var(--text-primary);
  position: relative;
  overflow: hidden;
}

.toc-item::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: var(--gradient-primary);
  transition: left var(--transition-normal);
  z-index: 1;
  opacity: 0.1;
}

.toc-item:hover::before {
  left: 0;
}

.toc-item:hover {
  transform: translateX(10px);
  color: var(--primary);
  box-shadow: var(--shadow-md);
}

.toc-item-content {
  position: relative;
  z-index: 2;
  width: 100%;
}

.toc-item a {
  color: inherit;
  text-decoration: none;
  font-weight: 500;
  display: flex;
  align-items: center;
  font-size: var(--font-size-base);
}

.toc-item a i {
  margin-right: var(--space-sm);
  font-size: 1.2rem;
}

/* Content Sections */
.content-section {
  padding: var(--section-padding);
}

.feature-box {
  background: var(--surface);
  border-radius: var(--card-radius);
  padding: var(--space-2xl);
  margin-bottom: var(--space-3xl);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  color: var(--text-primary);
}

.feature-box::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--gradient-primary);
}

.feature-box:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-xl);
}

.feature-box h2 {
  color: var(--text-primary);
  margin-bottom: var(--space-xl);
  font-size: var(--font-size-3xl);
  font-weight: 700;
  display: flex;
  align-items: center;
}

.feature-box h2 i {
  color: var(--primary);
  margin-right: var(--space-md);
  font-size: var(--font-size-2xl);
}

.feature-box h3 {
  color: var(--text-primary);
  margin: var(--space-2xl) 0 var(--space-lg) 0;
  font-size: var(--font-size-2xl);
  font-weight: 600;
}

.feature-box h4 {
  color: var(--primary);
  margin: var(--space-xl) 0 var(--space-lg) 0;
  font-size: var(--font-size-xl);
  font-weight: 600;
}

.feature-box h5 {
  color: var(--text-primary);
  margin: var(--space-lg) 0 var(--space-sm) 0;
  font-size: var(--font-size-lg);
  font-weight: 600;
}

.feature-box h6 {
  color: var(--text-primary);
  margin: var(--space-md) 0 var(--space-sm) 0;
  font-size: var(--font-size-base);
  font-weight: 600;
}

.lead {
  font-size: var(--font-size-lg);
  font-weight: 400;
  line-height: 1.6;
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
}

/* Interactive Demo */
.interactive-demo {
  background: var(--bg-secondary);
  border-radius: var(--card-radius);
  padding: var(--space-2xl);
  margin: var(--space-xl) 0;
  border: 2px solid var(--border);
  position: relative;
  overflow: hidden;
}

.interactive-demo::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 100%;
  height: 100%;
  background: var(--gradient-primary);
  opacity: 0.03;
  transform: rotate(45deg);
  pointer-events: none;
}

/* Current Flow Animation */
.current-flow-animation {
  display: flex;
  justify-content: center;
  align-items: center;
  margin: var(--space-2xl) 0;
  position: relative;
  flex-wrap: wrap;
  gap: var(--space-lg);
}

.current-component {
  width: clamp(100px, 15vw, 140px);
  height: clamp(60px, 10vw, 90px);
  border-radius: var(--card-radius);
  margin: var(--space-sm);
  position: relative;
  transition: all var(--transition-normal);
  cursor: pointer;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-inverse);
  font-weight: 600;
  font-size: clamp(0.7rem, 1.5vw, 0.9rem);
  text-align: center;
  flex-shrink: 0;
  box-shadow: var(--shadow-md);
}

.current-component::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  transition: left 2s ease-in-out;
}

.current-component:hover::before {
  left: 100%;
}

.voltage-source {
  background: linear-gradient(135deg, #ff6b6b, #ee5a24);
  box-shadow: 0 0 20px rgba(255, 107, 107, 0.4);
}

.conductor {
  background: var(--gradient-primary);
  box-shadow: 0 0 20px rgba(30, 144, 255, 0.4);
}

.load-component {
  background: linear-gradient(135deg, #4834d4, #6c5ce7);
  box-shadow: 0 0 20px rgba(72, 52, 212, 0.4);
}

.current-arrow {
  position: relative;
  width: clamp(30px, 5vw, 50px);
  height: 4px;
  background: var(--primary);
  border-radius: 2px;
  animation: currentFlow 3s ease-in-out infinite;
}

.current-arrow::after {
  content: '';
  position: absolute;
  right: -8px;
  top: -6px;
  width: 0;
  height: 0;
  border-left: 12px solid var(--primary);
  border-top: 7px solid transparent;
  border-bottom: 7px solid transparent;
}

.current-component:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-xl);
}

/* Type Grid */
.type-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-xl);
  margin: var(--space-2xl) 0;
}

.type-card {
  background: var(--surface);
  border-radius: var(--card-radius);
  padding: var(--space-xl);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--border);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  color: var(--text-primary);
  min-height: 280px;
  display: flex;
  flex-direction: column;
}

.type-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition-normal);
  z-index: 1;
}

.type-card:hover::before {
  opacity: 0.05;
}

.type-card:hover {
  transform: translateY(-10px) scale(1.02);
  box-shadow: var(--shadow-xl);
  border-color: var(--primary);
}

.type-card-content {
  position: relative;
  z-index: 2;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.type-card-icon {
  font-size: clamp(2.5rem, 4vw, 3.5rem);
  color: var(--primary);
  margin-bottom: var(--space-lg);
  display: block;
}

.type-card h4 {
  color: var(--primary);
  margin-bottom: var(--space-lg);
  font-size: var(--font-size-xl);
  font-weight: 600;
  flex-shrink: 0;
}

.type-card p {
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
  flex-shrink: 0;
}

.type-card ul {
  flex-grow: 1;
  padding-left: var(--space-lg);
}

.type-card li {
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
}

/* Enhanced Tables */
.enhanced-table {
  background: var(--surface);
  border-radius: var(--card-radius);
  overflow: hidden;
  overflow-x: auto;
  box-shadow: var(--shadow-lg);
  margin: var(--space-2xl) 0;
  border: 1px solid var(--border);
}

.enhanced-table table {
  width: 100%;
  min-width: 600px;
  border-collapse: collapse;
  font-size: var(--font-size-sm);
}

.enhanced-table th {
  background: var(--gradient-primary);
  color: var(--text-inverse);
  padding: var(--space-lg);
  text-align: left;
  font-weight: 600;
  font-size: var(--font-size-sm);
  white-space: nowrap;
  position: sticky;
  top: 0;
  z-index: 10;
}

.enhanced-table td {
  padding: var(--space-lg);
  border-bottom: 1px solid var(--border);
  transition: background-color var(--transition-fast);
  color: var(--text-primary);
  font-size: var(--font-size-sm);
  vertical-align: top;
}

.enhanced-table tr:hover td {
  background-color: var(--bg-secondary);
}

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

.enhanced-table strong {
  color: var(--primary);
  font-weight: 600;
}

/* Formula Box */
.formula-box {
  background: var(--gradient-primary);
  color: var(--text-inverse);
  border-radius: var(--card-radius);
  padding: var(--space-2xl);
  margin: var(--space-2xl) 0;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.formula-box::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.1);
  transform: rotate(45deg);
  transition: all var(--transition-slow);
}

.formula-box:hover::before {
  right: -40%;
}

.formula-text {
  font-family: 'JetBrains Mono', monospace;
  font-size: clamp(1.2rem, 3vw, 2rem);
  font-weight: 500;
  margin: 0;
  position: relative;
  z-index: 2;
  word-break: break-all;
  line-height: 1.4;
}

.formula-description {
  margin-top: var(--space-lg);
  font-size: var(--font-size-base);
  opacity: 0.9;
  position: relative;
  z-index: 2;
}

/* Key Points Grid */
.key-points-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-xl);
  margin: var(--space-2xl) 0;
}

.key-point {
  background: var(--surface);
  border-radius: var(--card-radius);
  padding: var(--space-xl);
  border-left: 4px solid var(--success);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  color: var(--text-primary);
  position: relative;
  overflow: hidden;
}

.key-point::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(30, 144, 255, 0.1), transparent);
  transition: left var(--transition-slow);
}

.key-point:hover::before {
  left: 100%;
}

.key-point:hover {
  transform: translateX(10px);
  box-shadow: var(--shadow-lg);
}

.key-point-icon {
  color: var(--primary);
  font-size: 2rem;
  margin-bottom: var(--space-lg);
  display: block;
}

.key-point h5 {
  color: var(--text-primary);
  font-weight: 600;
  margin-bottom: var(--space-sm);
  font-size: var(--font-size-lg);
}

.key-point p {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Collapsible Sections */
.collapsible-header {
  cursor: pointer;
  padding: var(--space-lg);
  background: var(--bg-secondary);
  border-radius: var(--card-radius);
  margin-bottom: var(--space-sm);
  transition: all var(--transition-normal);
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-primary);
  font-size: var(--font-size-lg);
  font-weight: 600;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.collapsible-header:hover {
  background: var(--primary);
  color: var(--text-inverse);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.collapsible-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow), padding var(--transition-slow);
  background: var(--surface);
  border-radius: var(--card-radius);
  margin-bottom: var(--space-lg);
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.collapsible-content.active {
  max-height: 10000px;
  padding: var(--space-2xl);
  box-shadow: var(--shadow-md);
}

.collapsible-icon {
  transition: transform var(--transition-normal);
  font-size: 1.2rem;
}

.collapsible-header.active .collapsible-icon {
  transform: rotate(180deg);
}

/* Alert Boxes */
.alert-box {
  padding: var(--space-xl);
  border-radius: var(--card-radius);
  margin: var(--space-xl) 0;
  border-left: 4px solid;
  color: var(--text-primary);
  font-size: var(--font-size-base);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.alert-box::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: inherit;
}

.alert-info {
  background: rgba(30, 144, 255, 0.1);
  border-color: var(--primary);
  color: var(--text-primary);
}

.alert-warning {
  background: rgba(255, 140, 0, 0.1);
  border-color: var(--warning);
  color: var(--text-primary);
}

.alert-success {
  background: rgba(34, 139, 34, 0.1);
  border-color: var(--success);
  color: var(--text-primary);
}

.alert-danger {
  background: rgba(220, 20, 60, 0.1);
  border-color: var(--danger);
  color: var(--text-primary);
}

.alert-box h5, .alert-box h6 {
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
}

.alert-box i {
  margin-right: var(--space-sm);
}

.alert-box ul {
  margin-bottom: 0;
  padding-left: var(--space-lg);
}

.alert-box li {
  margin-bottom: var(--space-xs);
}

/* Example Box */
.example-box {
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: var(--card-radius);
  padding: var(--space-xl);
  margin: var(--space-xl) 0;
  color: var(--text-primary);
  position: relative;
  overflow: hidden;
}

.example-box::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient-accent);
}

.example-box h6 {
  color: var(--primary);
  margin-bottom: var(--space-md);
  font-weight: 600;
  display: flex;
  align-items: center;
}

.example-box h6 i {
  margin-right: var(--space-sm);
  color: var(--accent);
}

.example-box ul {
  margin-bottom: 0;
  padding-left: var(--space-lg);
}

.example-box li {
  margin-bottom: var(--space-sm);
  line-height: 1.5;
}

.example-box strong {
  color: var(--primary);
}

/* Step by Step */
.step-by-step {
  counter-reset: step-counter;
  margin: var(--space-xl) 0;
}

.step-item {
  counter-increment: step-counter;
  position: relative;
  padding-left: 3rem;
  margin-bottom: var(--space-xl);
  background: var(--surface-elevated);
  padding: var(--space-lg) var(--space-lg) var(--space-lg) 3.5rem;
  border-radius: var(--card-radius);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border);
  transition: all var(--transition-normal);
}

.step-item::before {
  content: counter(step-counter);
  position: absolute;
  left: var(--space-lg);
  top: var(--space-lg);
  width: 2rem;
  height: 2rem;
  background: var(--gradient-primary);
  color: var(--text-inverse);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  font-size: var(--font-size-sm);
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
}

.step-item:hover {
  transform: translateX(5px);
  box-shadow: var(--shadow-md);
}

.step-item strong {
  color: var(--primary);
  font-weight: 600;
}

/* Highlight Text */
.highlight-text {
  background: var(--gradient-primary);
  color: var(--text-inverse);
  padding: 0.2rem 0.6rem;
  border-radius: 0.25rem;
  font-weight: 500;
  font-size: var(--font-size-base);
  display: inline-block;
  box-shadow: 0 2px 4px rgba(30, 144, 255, 0.2);
}

/* Images */
.converter-image {
  max-width: 100%;
  height: auto;
  border-radius: var(--card-radius);
  box-shadow: var(--shadow-lg);
  margin: var(--space-xl) 0;
  display: block;
  transition: transform var(--transition-normal);
}

.converter-image:hover {
  transform: scale(1.02);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md) var(--space-xl);
  border-radius: var(--button-radius);
  text-decoration: none;
  font-weight: 500;
  transition: all var(--transition-normal);
  border: none;
  cursor: pointer;
  font-size: var(--font-size-base);
  font-family: inherit;
  box-shadow: var(--shadow-sm);
}

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

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

.btn-light {
  background: var(--text-inverse);
  color: var(--primary);
  border: 2px solid transparent;
}

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

.btn-outline-light {
  background: transparent;
  color: var(--text-inverse);
  border: 2px solid var(--text-inverse);
}

.btn-outline-light:hover {
  background: var(--text-inverse);
  color: var(--primary);
}

.btn-lg {
  padding: var(--space-lg) var(--space-2xl);
  font-size: var(--font-size-lg);
}

.btn i {
  margin-right: var(--space-sm);
}

/* Breadcrumb */
.breadcrumb {
  background: transparent;
  padding: 0;
  margin-bottom: var(--space-lg);
  list-style: none;
  display: flex;
  flex-wrap: wrap;
}

.breadcrumb-item {
  display: flex;
  align-items: center;
}

.breadcrumb-item + .breadcrumb-item::before {
  content: '/';
  margin: 0 var(--space-sm);
  color: rgba(255, 255, 255, 0.5);
}

.breadcrumb-item a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: color var(--transition-normal);
}

.breadcrumb-item a:hover {
  color: var(--text-inverse);
}

.breadcrumb-item.active {
  color: var(--text-inverse);
}

/* Responsive Grid System */
.row {
  display: flex;
  flex-wrap: wrap;
  margin: 0 -0.75rem;
}

.col, .col-md-6, .col-md-8, .col-md-4, .col-lg-11 {
  flex: 0 0 auto;
  padding: 0 0.75rem;
}

.col {
  flex: 1 0 0%;
}

.col-md-4 {
  width: 33.333333%;
}

.col-md-6 {
  width: 50%;
}

.col-md-8 {
  width: 66.666667%;
}

.col-lg-11 {
  width: 91.666667%;
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-primary { color: var(--primary) !important; }
.text-secondary { color: var(--text-secondary) !important; }
.text-muted { color: var(--text-muted) !important; }
.text-white { color: var(--text-inverse) !important; }
.text-white-50 { color: rgba(255, 255, 255, 0.5) !important; }

.mb-0 { margin-bottom: 0 !important; }
.mb-3 { margin-bottom: var(--space-lg) !important; }
.mb-4 { margin-bottom: var(--space-xl) !important; }
.mt-2 { margin-top: var(--space-sm) !important; }
.mt-3 { margin-top: var(--space-lg) !important; }
.mt-4 { margin-top: var(--space-xl) !important; }
.my-4 { margin: var(--space-xl) 0 !important; }

.d-flex { display: flex !important; }
.d-block { display: block !important; }
.d-inline-block { display: inline-block !important; }

.justify-content-center { justify-content: center !important; }
.justify-content-between { justify-content: space-between !important; }
.align-items-center { align-items: center !important; }

.gap-3 { gap: var(--space-lg) !important; }

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

@keyframes currentFlow {
  0% {
    opacity: 0.3;
    transform: translateX(-30px);
  }
  50% {
    opacity: 1;
    transform: translateX(0);
  }
  100% {
    opacity: 0.3;
    transform: translateX(30px);
  }
}

@keyframes shimmer {
  0% {
    transform: translateX(-100%);
  }
  100% {
    transform: translateX(100%);
  }
}

.animate-pulse {
  animation: pulse 2s infinite;
}

.flow-animation {
  animation: currentFlow 3s ease-in-out infinite;
}

/* Dark mode specific adjustments */
[data-theme="dark"] .hero-section {
  background: var(--gradient-primary);
}

[data-theme="dark"] .progress-bar {
  background: var(--gradient-primary);
  box-shadow: 0 0 10px rgba(135, 206, 235, 0.5);
}

[data-theme="dark"] .highlight-text {
  color: var(--text-inverse);
}

[data-theme="dark"] .alert-info {
  background: rgba(135, 206, 235, 0.1);
  color: var(--text-primary);
}

[data-theme="dark"] .alert-warning {
  background: rgba(255, 165, 0, 0.1);
  color: var(--text-primary);
}

[data-theme="dark"] .alert-success {
  background: rgba(0, 255, 127, 0.1);
  color: var(--text-primary);
}

[data-theme="dark"] .alert-danger {
  background: rgba(255, 99, 71, 0.1);
  color: var(--text-primary);
}

/* Complete responsive design - all breakpoints covered */
@media (min-width: 1400px) {
  :root {
    --container-max-width: 1400px;
    --container-padding: 2rem;
    --section-padding: 4rem 0;
    --hero-height: 70vh;
  }
  
  .hero-title {
    font-size: 4.5rem;
  }
  
  .hero-subtitle {
    font-size: 1.75rem;
  }
  
  .type-grid {
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  }
  
  .enhanced-table th,
  .enhanced-table td {
    padding: 1.5rem;
  }
}

@media (min-width: 1200px) and (max-width: 1399px) {
  :root {
    --container-padding: 1.5rem;
  }
  
  .type-grid {
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  }
}

@media (min-width: 992px) and (max-width: 1199px) {
  :root {
    --container-padding: 1.5rem;
    --section-padding: 3rem 0;
  }
  
  .hero-title {
    font-size: 3rem;
  }
  
  .type-grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  }
  
  .toc-grid {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  }
  
  .key-points-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  }
}

@media (min-width: 768px) and (max-width: 991px) {
  :root {
    --container-padding: 1rem;
    --section-padding: 2.5rem 0;
    --hero-height: 50vh;
  }
  
  .hero-title {
    font-size: 2.5rem;
  }
  
  .hero-subtitle {
    font-size: 1.2rem;
  }
  
  .toc-container {
    position: relative;
    top: auto;
  }
  
  .type-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
  }
  
  .toc-grid {
    grid-template-columns: 1fr;
  }
  
  .key-points-grid {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  }
  
  .current-flow-animation {
    flex-direction: column;
    align-items: center;
  }
  
  .current-arrow {
    transform: rotate(90deg);
    margin: var(--space-md) 0;
  }
  
  .col-md-4, .col-md-6, .col-md-8 {
    width: 100%;
  }
  
  .enhanced-table {
    font-size: var(--font-size-sm);
  }
  
  .feature-box {
    padding: var(--space-xl);
  }
}

@media (min-width: 576px) and (max-width: 767px) {
  :root {
    --container-padding: 1rem;
    --section-padding: 2rem 0;
    --hero-height: 45vh;
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-subtitle {
    font-size: 1.1rem;
  }
  
  .type-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
  
  .toc-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }
  
  .key-points-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
  
  .theme-toggle {
    bottom: 15px;
    right: 15px;
    width: 55px;
    height: 55px;
    font-size: 1.3rem;
  }
  
  .back-to-top {
    bottom: 75px;
    right: 15px;
    width: 45px;
    height: 45px;
    font-size: 1.1rem;
  }
  
  .current-flow-animation {
    flex-direction: column;
    gap: var(--space-md);
  }
  
  .current-component {
    margin: var(--space-sm) 0;
  }
  
  .enhanced-table th,
  .enhanced-table td {
    padding: var(--space-md);
  }
  
  .feature-box {
    padding: var(--space-xl);
  }
  
  .type-card {
    min-height: 250px;
  }
}

@media (max-width: 575px) {
  :root {
    --container-padding: 0.75rem;
    --section-padding: 1.5rem 0;
    --hero-height: 40vh;
    --font-size-base: 0.9rem;
    --font-size-lg: 1rem;
    --font-size-xl: 1.1rem;
    --font-size-2xl: 1.3rem;
    --font-size-3xl: 1.6rem;
  }
  
  html {
    font-size: 14px;
  }
  
  .hero-title {
    font-size: 1.8rem;
    line-height: 1.1;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  .type-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }
  
  .toc-grid {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }
  
  .toc-item {
    padding: var(--space-md);
    min-height: 60px;
  }
  
  .key-points-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }
  
  .theme-toggle {
    bottom: 10px;
    right: 10px;
    width: 50px;
    height: 50px;
    font-size: 1.2rem;
  }
  
  .back-to-top {
    bottom: 65px;
    right: 10px;
    width: 40px;
    height: 40px;
    font-size: 1rem;
  }
  
  .current-flow-animation {
    flex-direction: column;
    gap: var(--space-sm);
    margin: var(--space-lg) 0;
  }
  
  .current-component {
    width: 120px;
    height: 60px;
    margin: var(--space-xs) 0;
    font-size: 0.7rem;
  }
  
  .current-arrow {
    display: none;
  }
  
  .enhanced-table {
    font-size: 0.8rem;
    border-radius: var(--input-radius);
  }
  
  .enhanced-table th,
  .enhanced-table td {
    padding: var(--space-sm);
  }
  
  .enhanced-table table {
    min-width: 400px;
  }
  
  .formula-text {
    font-size: 1rem;
    word-break: break-all;
  }
  
  .collapsible-header {
    padding: var(--space-md);
    font-size: var(--font-size-base);
  }
  
  .step-item {
    padding-left: 2.5rem;
  }
  
  .step-item::before {
    width: 1.8rem;
    height: 1.8rem;
    font-size: 0.8rem;
    left: var(--space-sm);
  }
  
  .type-card {
    min-height: 220px;
    padding: var(--space-lg);
  }
  
  .alert-box {
    padding: var(--space-lg);
    font-size: var(--font-size-sm);
  }
  
  .feature-box {
    padding: var(--space-lg);
  }
  
  .interactive-demo {
    padding: var(--space-lg);
  }
  
  .toc-container {
    padding: var(--space-lg);
  }
  
  .btn {
    padding: var(--space-sm) var(--space-lg);
    font-size: var(--font-size-sm);
  }
  
  .btn-lg {
    padding: var(--space-md) var(--space-xl);
    font-size: var(--font-size-base);
  }
}

@media (max-width: 479px) {
  :root {
    --container-padding: 0.5rem;
    --space-sm: 0.25rem;
    --space-md: 0.5rem;
    --space-lg: 0.75rem;
    --space-xl: 1rem;
    --space-2xl: 1.5rem;
  }
  
  html {
    font-size: 13px;
  }
  
  .hero-title {
    font-size: 1.6rem;
  }
  
  .hero-subtitle {
    font-size: 0.9rem;
  }
  
  .feature-box {
    padding: var(--space-md);
  }
  
  .interactive-demo {
    padding: var(--space-md);
  }
  
  .current-component {
    width: 100px;
    height: 50px;
    font-size: 0.6rem;
  }
  
  .type-card {
    padding: var(--space-md);
    min-height: 200px;
  }
}

@media (max-width: 320px) {
  :root {
    --container-padding: 0.25rem;
  }
  
  html {
    font-size: 12px;
  }
  
  .theme-toggle {
    width: 45px;
    height: 45px;
    font-size: 1rem;
  }
  
  .back-to-top {
    width: 35px;
    height: 35px;
    font-size: 0.9rem;
  }
  
  .current-component {
    width: 90px;
    height: 45px;
    font-size: 0.5rem;
  }
}

/* Landscape orientation adjustments */
@media (orientation: landscape) and (max-height: 600px) {
  .hero-section {
    min-height: 80vh;
    padding: var(--space-xl) 0;
  }
  
  .hero-title {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
  }
  
  .hero-subtitle {
    font-size: clamp(0.9rem, 2vw, 1.1rem);
  }
}

/* Portrait orientation adjustments for tablets */
@media (orientation: portrait) and (min-width: 768px) and (max-width: 1024px) {
  .type-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .key-points-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .toc-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  .current-component::before {
    animation: none;
  }
  
  .current-arrow {
    animation: none;
  }
}

/* Focus states for keyboard navigation */
.toc-item:focus,
.type-card:focus,
.collapsible-header:focus,
.theme-toggle:focus,
.back-to-top:focus,
.btn:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* Touch device optimizations */
@media (hover: none) and (pointer: coarse) {
  .toc-item:hover,
  .type-card:hover,
  .key-point:hover,
  .feature-box:hover,
  .current-component:hover {
    transform: none;
  }
  
  .theme-toggle:hover,
  .back-to-top:hover,
  .btn:hover {
    transform: scale(1);
  }
  
  .step-item:hover {
    transform: none;
  }
}

/* Print mode */
@media print {
  * {
    background: white !important;
    color: black !important;
    box-shadow: none !important;
  }
  
  .theme-toggle,
  .back-to-top,
  .progress-container {
    display: none !important;
  }
  
  .hero-section {
    background: white !important;
    color: black !important;
  }
  
  .feature-box,
  .type-card,
  .enhanced-table {
    break-inside: avoid;
    page-break-inside: avoid;
  }
  
  .hero-title,
  .feature-box h2,
  .feature-box h3 {
    page-break-after: avoid;
  }
}

/* Custom scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--primary);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--secondary);
}

/* Loading states */
.loading {
  opacity: 0.6;
  pointer-events: none;
}

.loading::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
  animation: shimmer 1.5s infinite;
}

/* Selection styling */
::selection {
  background: var(--primary);
  color: var(--text-inverse);
}

::-moz-selection {
  background: var(--primary);
  color: var(--text-inverse);
}