/* ASCII2Unicode Professional - Modern Corporate Styles */
/* Intel-Inspired Fortune 500 Design System */
/* Version 2.0.0.0 Build 00001 */

/* ========================================
   CSS Custom Properties (Variables)
======================================== */
:root {
  /* Intel Corporate Color Palette */
  --intel-blue-50: #eff6ff;
  --intel-blue-100: #dbeafe;
  --intel-blue-200: #bfdbfe;
  --intel-blue-300: #93c5fd;
  --intel-blue-400: #60a5fa;
  --intel-blue-500: #3b82f6;
  --intel-blue-600: #2563eb;
  --intel-blue-700: #1d4ed8;
  --intel-blue-800: #1e40af;
  --intel-blue-900: #1e3a8a;
  
  /* Intel Silver/Gray Palette */
  --intel-silver-50: #f8fafc;
  --intel-silver-100: #f1f5f9;
  --intel-silver-200: #e2e8f0;
  --intel-silver-300: #cbd5e1;
  --intel-silver-400: #94a3b8;
  --intel-silver-500: #64748b;
  --intel-silver-600: #475569;
  --intel-silver-700: #334155;
  --intel-silver-800: #1e293b;
  --intel-silver-900: #0f172a;
  
  /* Semantic Colors */
  --primary-color: var(--intel-blue-600);
  --primary-hover: var(--intel-blue-700);
  --secondary-color: var(--intel-silver-600);
  --accent-color: #f59e0b;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --error-color: #ef4444;
  
  /* Background Colors */
  --bg-primary: var(--intel-silver-50);
  --bg-secondary: #ffffff;
  --bg-tertiary: var(--intel-silver-100);
  --bg-dark: var(--intel-silver-800);
  
  /* Text Colors */
  --text-primary: var(--intel-silver-900);
  --text-secondary: var(--intel-silver-600);
  --text-muted: var(--intel-silver-400);
  --text-inverse: #ffffff;
  
  /* Typography */
  --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-family-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;
  
  /* Container Widths */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1536px;
}

/* ========================================
   Base Styles
======================================== */
* {
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-family-primary);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-primary);
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--intel-blue-50) 100%);
  margin: 0;
  padding: 0;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   Layout Components
======================================== */
.container {
  width: 100%;
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-md);
  }
}

/* ========================================
   Header & Navigation
======================================== */
.header {
  background: linear-gradient(135deg, var(--intel-silver-800) 0%, var(--intel-silver-900) 100%);
  box-shadow: var(--shadow-lg);
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
}

.navbar {
  padding: calc(var(--spacing-md) * 0.7) 0;
}

.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.logo-icon {
  font-size: calc(1.5rem * 0.7);
  color: var(--intel-blue-400);
  background: linear-gradient(135deg, var(--intel-blue-400), var(--intel-blue-600));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.logo-text {
  font-size: calc(1.5rem * 0.7);
  font-weight: 700;
  margin: 0;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.logo-ascii {
  color: var(--text-inverse);
  text-shadow: 0 0 10px rgba(59, 130, 246, 0.3);
}

.logo-connector {
  color: var(--intel-silver-400);
  font-weight: 400;
}

.logo-unicode {
  background: linear-gradient(135deg, var(--accent-color), #f97316);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: 0 0 10px rgba(245, 158, 11, 0.3);
}

.tagline {
  color: var(--intel-silver-300);
  font-size: calc(0.875rem * 0.7);
  font-weight: 400;
  margin: 0;
  opacity: 0.9;
}

.navbar-menu {
  display: flex;
  align-items: center;
}

.navbar-nav {
  display: flex;
  gap: var(--spacing-lg);
}

.nav-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--intel-silver-300);
  font-weight: 500;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  cursor: pointer;
}

.nav-item.active {
  background: rgba(59, 130, 246, 0.1);
  color: var(--intel-blue-300);
  border: 1px solid rgba(59, 130, 246, 0.2);
}

.nav-item:hover {
  background: rgba(255, 255, 255, 0.1);
  color: var(--text-inverse);
}

/* ========================================
   Main Content
======================================== */
.main-content {
  padding: var(--spacing-lg) 0;
  min-height: calc(100vh - 200px);
}

/* ========================================
   Hero Section
======================================== */
.hero-section {
  text-align: center;
  margin-bottom: calc(var(--spacing-md) * 0.7);
  padding: calc(var(--spacing-md) * 0.7) 0;
}

.hero-content {
  max-width: calc(700px * 0.7);
  margin: 0 auto;
}

.hero-title {
  font-size: calc(2rem * 0.7);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: calc(var(--spacing-sm) * 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: calc(var(--spacing-sm) * 0.7);
  flex-wrap: wrap;
}

.hero-title i {
  color: var(--primary-color);
  font-size: calc(1.5rem * 0.7);
}

.hero-description {
  font-size: calc(1rem * 0.7);
  color: var(--text-secondary);
  margin-bottom: calc(var(--spacing-lg) * 0.7);
  line-height: 1.5;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: calc(var(--spacing-lg) * 0.7);
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  align-items: center;
  gap: calc(var(--spacing-xs) * 0.7);
  color: var(--text-secondary);
  font-weight: 500;
  font-size: calc(0.875rem * 0.7);
}

.stat-item i {
  color: var(--primary-color);
  font-size: calc(1rem * 0.7);
}

@media (max-width: 768px) {
  .hero-title {
    font-size: calc(1.5rem * 0.7);
  }
  
  .hero-description {
    font-size: calc(0.9rem * 0.7);
  }
  
  .hero-stats {
    gap: calc(var(--spacing-sm) * 0.7);
  }
  
  .hero-section {
    padding: calc(var(--spacing-sm) * 0.7) 0;
    margin-bottom: calc(var(--spacing-sm) * 0.7);
  }
  
  .main-content {
    padding: calc(var(--spacing-sm) * 0.7) 0;
  }
  
  .text-input,
  .text-output {
    min-height: 300px;
    background: #475569 !important;
    color: #ffffff !important;
  }
  
  #output-box {
    background: #475569 !important;
    color: #ffffff !important;
  }
}

/* ========================================
   Converter Section
======================================== */
.converter-section {
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
  border: 1px solid var(--intel-silver-200);
}

.converter-container {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: var(--spacing-xl);
  align-items: start;
  margin-bottom: var(--spacing-xl);
}

@media (max-width: 1024px) {
  .converter-container {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .conversion-arrow {
    order: 2;
    justify-self: center;
  }
  
  .output-panel {
    order: 3;
  }
}

/* ========================================
   Converter Panels
======================================== */
.converter-panel {
  background: var(--bg-tertiary);
  border-radius: var(--radius-lg);
  border: 1px solid var(--intel-silver-200);
  overflow: hidden;
  transition: all var(--transition-normal);
}

.converter-panel:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--intel-blue-300);
}

.panel-header {
  background: linear-gradient(135deg, var(--intel-silver-100), var(--intel-silver-50));
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--intel-silver-200);
}

.panel-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 var(--spacing-xs) 0;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.panel-title i {
  color: var(--primary-color);
}

.panel-subtitle {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin: 0;
}

.panel-body {
  padding: var(--spacing-lg);
}

.textarea-container {
  position: relative;
}

.text-input,
.text-output {
  width: 100%;
  min-height: 400px;
  padding: var(--spacing-lg);
  border: 2px solid #64748b;
  border-radius: var(--radius-md);
  font-family: var(--font-family-mono);
  font-size: 1rem;
  line-height: 1.6;
  background: #475569 !important;
  color: #ffffff !important;
  resize: vertical;
  transition: none;
}

.text-input:focus,
.text-input:hover,
.text-input:active {
  outline: none;
  border-color: #64748b;
  box-shadow: none;
  background: #475569 !important;
  color: #ffffff !important;
}

.text-output:focus,
.text-output:hover,
.text-output:active {
  outline: none;
  border-color: #64748b;
  box-shadow: none;
  background: #475569 !important;
  color: #ffffff !important;
}

/* Specific styling for output box to maintain background */
#output-box {
  background: #475569 !important;
  color: #ffffff !important;
}

#output-box:focus,
#output-box:hover,
#output-box:active,
#output-box[readonly] {
  background: #475569 !important;
  color: #ffffff !important;
  border-color: #64748b;
  box-shadow: none;
  outline: none;
}

.text-input::placeholder,
.text-output::placeholder {
  color: #cbd5e1;
  font-style: italic;
}

.character-count {
  position: absolute;
  bottom: var(--spacing-sm);
  right: var(--spacing-sm);
  font-size: 0.75rem;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.9);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  backdrop-filter: blur(5px);
}

/* ========================================
   Conversion Arrow
======================================== */
.conversion-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-lg) 0;
}

.convert-btn {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
  color: var(--text-inverse);
  border: none;
  border-radius: 50%;
  width: 80px;
  height: 80px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.convert-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 var(--transition-slow);
}

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

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

.convert-btn:active {
  transform: scale(0.95);
}

.convert-btn i {
  font-size: 1.5rem;
}

.convert-text {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

@media (max-width: 1024px) {
  .convert-btn {
    width: 60px;
    height: 60px;
  }
  
  .convert-btn i {
    font-size: 1.25rem;
  }
  
  .convert-text {
    display: none;
  }
}

/* ========================================
   Action Controls
======================================== */
.action-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--intel-silver-200);
}

.control-group {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.checkbox-container {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.modern-checkbox {
  appearance: none;
  width: 20px;
  height: 20px;
  border: 2px solid var(--intel-silver-300);
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
}

.modern-checkbox:checked {
  background: var(--primary-color);
  border-color: var(--primary-color);
}

.modern-checkbox:checked::after {
  content: '✓';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: white;
  font-size: 12px;
  font-weight: bold;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 500;
  color: var(--text-primary);
  cursor: pointer;
  user-select: none;
}

.checkbox-label i {
  color: var(--primary-color);
}

.action-buttons {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

/* ========================================
   Button Styles
======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  border: none;
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 0.875rem;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.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 var(--transition-slow);
}

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

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-hover));
  color: var(--text-inverse);
  box-shadow: var(--shadow-md);
}

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

.btn-secondary {
  background: var(--intel-silver-600);
  color: var(--text-inverse);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: var(--intel-silver-700);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.btn-outline:hover {
  background: var(--primary-color);
  color: var(--text-inverse);
  transform: translateY(-2px);
}

@media (max-width: 768px) {
  .action-controls {
    flex-direction: column;
    align-items: stretch;
  }
  
  .action-buttons {
    justify-content: center;
  }
}

/* ========================================
   Features Section
======================================== */
.features-section {
  margin-bottom: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.features-container {
  text-align: center;
}

.section-title {
  font-size: 1.75rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
}

.section-title i {
  color: var(--accent-color);
  font-size: 1.5rem;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.feature-card {
  background: var(--bg-secondary);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--intel-silver-200);
  transition: all var(--transition-normal);
  text-align: center;
}

.feature-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-xl);
  border-color: var(--intel-blue-300);
}

.feature-icon {
  width: 60px;
  height: 60px;
  margin: 0 auto var(--spacing-md);
  background: linear-gradient(135deg, var(--intel-blue-100), var(--intel-blue-200));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.feature-icon i {
  font-size: 1.5rem;
  color: var(--primary-color);
}

.feature-title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.feature-description {
  color: var(--text-secondary);
  line-height: 1.5;
  font-size: 0.9rem;
}

/* ========================================
   Footer
======================================== */
.footer {
  background: linear-gradient(135deg, var(--intel-silver-800), var(--intel-silver-900));
  color: var(--intel-silver-300);
  padding: calc(var(--spacing-2xl) * 0.7) 0;
  margin-top: auto;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: calc(var(--spacing-lg) * 0.7);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: calc(var(--spacing-sm) * 0.7);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: calc(var(--spacing-sm) * 0.7);
  font-weight: 600;
  font-size: calc(1.125rem * 0.7);
}

.footer-logo i {
  color: var(--intel-blue-400);
}

.footer-tagline {
  font-size: calc(0.875rem * 0.7);
  color: var(--intel-silver-400);
  margin: 0;
}

.footer-info {
  text-align: right;
  display: flex;
  flex-direction: column;
  gap: calc(var(--spacing-sm) * 0.7);
}

.copyright {
  font-size: calc(0.875rem * 0.7);
  margin: 0;
}

.copyright i {
  color: #ef4444;
}

.tech-info {
  display: flex;
  align-items: center;
  gap: calc(var(--spacing-sm) * 0.7);
  font-size: calc(0.75rem * 0.7);
  color: var(--intel-silver-400);
}

.separator {
  opacity: 0.5;
}

@media (max-width: 768px) {
  .footer-content {
    flex-direction: column;
    text-align: center;
  }
  
  .footer-info {
    text-align: center;
  }
  
  .tech-info {
    flex-direction: column;
    gap: var(--spacing-xs);
  }
  
  .separator {
    display: none;
  }
}

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

.d-flex { display: flex; }
.d-block { display: block; }
.d-inline { display: inline; }
.d-none { display: none; }

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

.m-0 { margin: 0; }
.p-0 { padding: 0; }

.w-full { width: 100%; }
.h-full { height: 100%; }

/* ========================================
   Animations
======================================== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideIn {
  from { transform: translateX(-100%); }
  to { transform: translateX(0); }
}

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

.fade-in {
  animation: fadeIn 0.6s ease-out;
}

.slide-in {
  animation: slideIn 0.5s ease-out;
}

.pulse {
  animation: pulse 2s infinite;
}

/* ========================================
   Loading States
======================================== */
.loading {
  position: relative;
  overflow: hidden;
}

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

@keyframes loading {
  0% { left: -100%; }
  100% { left: 100%; }
}

/* ========================================
   Accessibility
======================================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

.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;
}

/* Focus styles for keyboard navigation */
*:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* ========================================
   Print Styles
======================================== */
@media print {
  .header,
  .footer,
  .action-controls,
  .features-section {
    display: none;
  }
  
  .converter-section {
    box-shadow: none;
    border: 1px solid #000;
  }
  
  .text-input,
  .text-output {
    border: 1px solid #000;
    background: white;
  }
}