/* =====================================================
   YTDownloader Pro - Professional CSS Framework
   Version: 2.0.0 - Ultra Modern & Professional Design
   ===================================================== */

:root {
  /* Brand Colors */
  --brand-primary: #ff0000;
  --brand-secondary: #ff4444;
  --brand-accent: #ff6666;
  
  /* Dark Theme */
  --bg-primary: #0a0a0a;
  --bg-secondary: #141414;
  --bg-tertiary: #1f1f1f;
  --bg-card: #252525;
  --bg-elevated: #2d2d2d;
  
  /* Text Colors */
  --text-primary: #ffffff;
  --text-secondary: #b3b3b3;
  --text-muted: #777777;
  
  /* UI Elements */
  --border-color: #333333;
  --border-light: #404040;
  
  /* Glass Effects */
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-hover: rgba(255, 255, 255, 0.08);
  
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.2);
  --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.3);
  --shadow-brand: 0 8px 32px rgba(255, 0, 0, 0.3);
  
  /* Gradients */
  --gradient-brand: linear-gradient(135deg, var(--brand-primary), var(--brand-secondary));
  --gradient-bg: radial-gradient(circle at 20% 80%, rgba(255, 0, 0, 0.15) 0%, transparent 50%),
                 radial-gradient(circle at 80% 20%, rgba(255, 68, 68, 0.1) 0%, transparent 50%),
                 linear-gradient(135deg, var(--bg-primary), var(--bg-secondary));
  
  /* Transitions */
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Spacing & Radius */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
}

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

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-primary);
  background: var(--gradient-bg);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Loading Screen */
.loading-screen {
  position: fixed;
  inset: 0;
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.loading-screen.hidden {
  opacity: 0;
  visibility: hidden;
}

.loading-content {
  text-align: center;
  animation: fadeInUp 1s ease-out;
}

.loading-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  font-size: 2rem;
  font-weight: 700;
  color: var(--brand-primary);
  margin-bottom: var(--space-xl);
}

.loading-logo i {
  font-size: 3rem;
  animation: pulse 2s ease-in-out infinite;
}

.loading-spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border-color);
  border-top: 3px solid var(--brand-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto var(--space-lg);
}

/* Main App */
.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Navigation */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(10, 10, 10, 0.8);
  backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--glass-border);
  transition: all var(--transition-normal);
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
  gap: var(--space-xl);
}

.brand-section {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
  text-decoration: none;
}

.brand-icon {
  font-size: 2rem;
  color: var(--brand-primary);
  transition: transform var(--transition-normal);
}

.brand:hover .brand-icon {
  transform: scale(1.1) rotate(5deg);
}

.brand-text {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.brand-pro {
  font-size: 0.8em;
  opacity: 0.8;
}

.version-badge {
  background: var(--gradient-brand);
  color: white;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
}

.nav-center {
  flex: 1;
  display: flex;
  justify-content: center;
  max-width: 400px;
}


.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.nav-btn {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.nav-btn:hover {
  color: var(--text-primary);
  background: var(--glass-bg);
}

.nav-btn.primary {
  background: var(--gradient-brand);
  color: white;
  font-weight: 600;
}

.nav-btn.primary:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-brand);
}

/* Hero Section */
.hero-section {
  position: relative;
  min-height: calc(100vh - 80px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3xl) var(--space-xl);
  overflow: hidden;
}

.hero-background {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.gradient-orb {
  position: absolute;
  border-radius: 50%;
  background: var(--gradient-brand);
  opacity: 0.1;
  animation: float 8s ease-in-out infinite;
  filter: blur(40px);
}

.orb-1 {
  width: 300px;
  height: 300px;
  top: 10%;
  left: 10%;
  animation-delay: 0s;
}

.orb-2 {
  width: 200px;
  height: 200px;
  top: 60%;
  right: 15%;
  animation-delay: 2s;
}

.orb-3 {
  width: 150px;
  height: 150px;
  bottom: 20%;
  left: 20%;
  animation-delay: 4s;
}

.hero-content {
  max-width: 1200px;
  width: 100%;
  text-align: center;
  z-index: 2;
}

.hero-header {
  margin-bottom: var(--space-3xl);
}

.hero-title {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: var(--space-lg);
}

.title-line {
  display: block;
}

.gradient-text {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-2xl);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-xl);
  max-width: 600px;
  margin: 0 auto;
}

.stat-item {
  text-align: center;
}

.stat-number {
  display: block;
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--brand-primary);
  line-height: 1;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Download Interface */
.download-interface {
  max-width: 900px;
  margin: 0 auto;
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(180%);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-2xl);
  box-shadow: var(--shadow-xl);
}

.interface-tabs {
  display: flex;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--space-xs);
  margin-bottom: var(--space-2xl);
  justify-content: center;
  gap: var(--space-xl);
  align-items: center;
}

.tab-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-lg) var(--space-xl);
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  min-width: 200px;
  font-size: 1.1rem;
}

.tab-btn:hover {
  color: var(--text-primary);
  background: var(--glass-bg);
}

.tab-btn.active {
  background: var(--gradient-brand);
  color: white;
  box-shadow: var(--shadow-brand);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
  animation: fadeInUp 0.5s ease-out;
}

/* Premium Cards */
.premium-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  backdrop-filter: blur(20px) saturate(180%);
  transition: all var(--transition-normal);
}

.premium-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.card-header {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--glass-border);
}

.header-icon {
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-brand);
  border-radius: var(--radius-lg);
  color: white;
  font-size: 1.5rem;
  box-shadow: var(--shadow-brand);
}

.header-content {
  flex: 1;
}

.header-content h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
}

.header-content p {
  color: var(--text-secondary);
}

.card-status {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.85rem;
  color: #00ff88;
}

.status-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: currentColor;
  animation: pulse 2s ease-in-out infinite;
}

/* Buttons */
.btn-primary, .btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-lg) var(--space-xl);
  border: none;
  border-radius: var(--radius-lg);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.btn-primary {
  background: var(--gradient-brand);
  color: white;
  box-shadow: var(--shadow-md);
}

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

.btn-secondary {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-card);
  transform: translateY(-1px);
}

/* Input Elements */
.input-group {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.input-wrapper {
  position: relative;
  flex: 1;
}

.url-input {
  width: 100%;
  padding: var(--space-lg) var(--space-xl);
  background: var(--bg-elevated);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-size: 1rem;
  transition: all var(--transition-normal);
}

.url-input:focus {
  outline: none;
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px rgba(255, 0, 0, 0.1);
}

.url-input::placeholder {
  color: var(--text-muted);
}

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

@keyframes float {
  0%, 100% {
    transform: translateY(0px) rotate(0deg);
  }
  50% {
    transform: translateY(-20px) rotate(180deg);
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.8;
    transform: scale(1.05);
  }
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* ===== MODERN LOADING BUTTON ANIMATIONS ===== */
@keyframes modernSpin {
  0% { 
    transform: rotate(0deg);
    border-width: 2px;
  }
  50% {
    transform: rotate(180deg);
    border-width: 3px;
  }
  100% { 
    transform: rotate(360deg);
    border-width: 2px;
  }
}

@keyframes pulseGlow {
  0%, 100% {
    box-shadow: 0 0 20px rgba(16, 185, 129, 0.4);
    transform: scale(1);
  }
  50% {
    box-shadow: 0 0 40px rgba(16, 185, 129, 0.8);
    transform: scale(1.02);
  }
}

@keyframes ripple {
  0% {
    transform: scale(0);
    opacity: 1;
  }
  100% {
    transform: scale(4);
    opacity: 0;
  }
}

/* ===== VIDEO PREVIEW MODERN STYLES ===== */
.video-preview {
  margin-top: var(--space-2xl);
  padding: var(--space-xl);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  backdrop-filter: blur(20px) saturate(180%);
  box-shadow: var(--shadow-lg);
  animation: slideInUp 0.5s ease-out;
}

.video-preview.hidden {
  display: none;
}

.preview-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--glass-border);
}

.preview-title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--brand-primary);
}

.preview-title i {
  font-size: 1.1rem;
}

.close-preview {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.close-preview:hover {
  color: var(--text-primary);
  background: var(--glass-hover);
  transform: scale(1.1) rotate(90deg);
  border-color: var(--brand-primary);
}

.preview-content {
  display: flex;
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.video-thumbnail-container {
  position: relative;
  flex-shrink: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.video-thumbnail {
  width: 240px;
  height: 135px;
  object-fit: cover;
  transition: transform var(--transition-normal);
  background-color: #333;
  border: 2px solid var(--brand-primary);
  display: block;
  visibility: visible;
  opacity: 1;
}

.thumbnail-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.4);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.video-thumbnail-container:hover .thumbnail-overlay {
  opacity: 1;
}

.video-thumbnail-container:hover .video-thumbnail {
  transform: scale(1.05);
}

.play-preview {
  width: 54px;
  height: 54px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.9);
  border: none;
  border-radius: 50%;
  color: var(--brand-primary);
  font-size: 1.2rem;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.play-preview:hover {
  transform: scale(1.1);
  background: white;
  box-shadow: var(--shadow-brand);
}

.duration-badge {
  position: absolute;
  bottom: var(--space-sm);
  right: var(--space-sm);
  background: rgba(0, 0, 0, 0.8);
  color: white;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
  font-family: var(--font-family-mono);
}

.video-details {
  flex: 1;
}

.video-title {
  font-size: 1.3rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}

.video-meta {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.meta-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.meta-item i {
  width: 16px;
  color: var(--brand-primary);
}

.video-description {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
  line-clamp: 3;
  overflow: hidden;
}

/* ===== DOWNLOAD OPTIONS MODERN STYLES ===== */
.download-options {
  background: var(--bg-elevated);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  border: 1px solid var(--glass-border);
}

.options-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
  gap: var(--space-md);
}

.options-title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

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

.format-toggle {
  display: flex;
  background: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--space-xs);
  border: 1px solid var(--glass-border);
}

.format-btn {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  background: transparent;
  border: none;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.format-btn:hover {
  color: var(--text-primary);
  background: var(--glass-bg);
}

.format-btn.active {
  background: var(--gradient-brand);
  color: white;
  box-shadow: var(--shadow-brand);
}

.format-btn.active::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.2), transparent);
  animation: shimmer 2s infinite;
}

.quality-selector {
  margin-bottom: var(--space-xl);
}

.quality-selector label {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
  font-weight: 600;
  color: var(--text-primary);
}

.quality-selector label i {
  color: var(--brand-primary);
}

.custom-select {
  position: relative;
}

.quality-dropdown {
  width: 100%;
  padding: var(--space-md) var(--space-xl) var(--space-md) var(--space-md);
  background: var(--bg-card);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition-normal);
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
}

.quality-dropdown:focus {
  outline: none;
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px rgba(255, 0, 0, 0.1);
  background: var(--bg-elevated);
}

.select-arrow {
  position: absolute;
  right: var(--space-md);
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 0.8rem;
  pointer-events: none;
  transition: transform var(--transition-fast);
}

.custom-select:hover .select-arrow {
  color: var(--brand-primary);
  transform: translateY(-50%) scale(1.1);
}

.download-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-top: var(--space-lg);
  position: relative;
}

.btn-download {
  position: relative;
  width: 100%;
  padding: var(--space-lg) var(--space-xl);
  border: none;
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition-normal);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
}

.btn-download.video {
  background: var(--gradient-brand);
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-download.audio {
  background: linear-gradient(135deg, #667eea, #764ba2);
  color: white;
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

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

.btn-download.video:hover {
  box-shadow: var(--shadow-brand);
}

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

.btn-download .btn-content {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  transition: all var(--transition-normal);
}

.btn-download.loading .btn-content {
  opacity: 0;
  transform: scale(0.8);
  transition: all var(--transition-normal);
}

/* Modern Loading Button Styles */
.btn-download.loading {
  position: relative;
  animation: pulseGlow 2s ease-in-out infinite;
  overflow: hidden;
}

.btn-download.loading::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 10px;
  height: 10px;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  animation: ripple 2s infinite;
}

.btn-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  position: relative;
  z-index: 2;
}

.btn-loading .spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  border-top: 2px solid var(--brand-primary);
  border-right: 2px solid rgba(16, 185, 129, 0.6);
  animation: modernSpin 1.2s cubic-bezier(0.4, 0, 0.2, 1) infinite;
  position: relative;
}

.btn-loading .spinner::before {
  content: '';
  position: absolute;
  top: -3px;
  left: -3px;
  right: -3px;
  bottom: -3px;
  border: 1px solid rgba(16, 185, 129, 0.1);
  border-radius: 50%;
  animation: modernSpin 2s linear infinite reverse;
}

.btn-loading .loading-text {
  font-size: 0.9rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.9);
  animation: pulse 1.5s ease-in-out infinite;
}

/* Analyze Button Loading States */
.btn-primary.loading {
  position: relative;
  animation: pulseGlow 2s ease-in-out infinite;
  overflow: hidden;
}

.btn-primary.loading::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 8px;
  height: 8px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  animation: ripple 1.8s infinite;
}

.btn-primary.loading .btn-content {
  opacity: 0;
  transform: scale(0.9);
  transition: all var(--transition-normal);
}

/* Unified Loading Spinner for All Buttons */
.btn.loading .btn-loading {
  position: relative;
  z-index: 2;
}

.btn.loading .btn-loading .spinner {
  filter: drop-shadow(0 0 8px rgba(16, 185, 129, 0.4));
}

.progress-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  overflow: hidden;
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.btn-download.loading .progress-bar {
  opacity: 1;
}

.progress-fill {
  height: 100%;
  background: rgba(255, 255, 255, 0.8);
  width: 0%;
  transition: width var(--transition-normal);
  position: relative;
}

.progress-fill::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.6), transparent);
  animation: progressShimmer 1.5s infinite;
}

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

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

/* ===== ADVANCED DOWNLOAD PROGRESS BAR ===== */
.download-progress-container {
  background: var(--glass-bg);
  border: 3px solid var(--brand-primary);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  margin-top: var(--space-md);
  backdrop-filter: blur(20px) saturate(180%);
  box-shadow: var(--shadow-brand);
  animation: slideInUp 0.5s ease-out;
  position: relative;
  z-index: 10;
  transform: scale(1.02);
  max-width: 100%;
  width: 100%;
}

.download-progress-container.hidden {
  display: none;
}

.download-progress-container::before {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: var(--gradient-brand);
  border-radius: var(--radius-xl);
  z-index: -1;
  opacity: 0.3;
  animation: pulse 2s ease-in-out infinite;
}

.progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--glass-border);
}

.progress-title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

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

.progress-close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.progress-close:hover {
  color: var(--text-primary);
  background: var(--glass-hover);
  transform: scale(1.1) rotate(90deg);
  border-color: var(--brand-primary);
}

.progress-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.progress-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  padding: var(--space-lg);
  background: var(--bg-elevated);
  border-radius: var(--radius-lg);
  border: 1px solid var(--glass-border);
}

.stat-item {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 600;
}

.stat-value {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--brand-primary);
  font-family: 'JetBrains Mono', monospace;
}

.progress-bar-advanced {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.progress-track {
  position: relative;
  height: 16px;
  background: var(--bg-elevated);
  border-radius: var(--radius-full);
  overflow: hidden;
  border: 1px solid var(--glass-border);
}

.progress-fill-advanced {
  height: 100%;
  background: var(--gradient-brand);
  border-radius: var(--radius-full);
  width: 0%;
  transition: width 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
  box-shadow: 0 0 10px rgba(255, 0, 0, 0.3);
}

.progress-fill-advanced::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
  animation: progressShimmer 2s infinite;
}

.progress-shimmer {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
  animation: shimmer 3s infinite;
  pointer-events: none;
}

.progress-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

#progress-status-text {
  font-weight: 500;
  color: var(--text-primary);
}

#file-size-info {
  font-family: 'JetBrains Mono', monospace;
  color: var(--text-muted);
}

.progress-actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  padding-top: var(--space-md);
  border-top: 1px solid var(--glass-border);
}

.progress-actions .btn-secondary {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  color: var(--text-primary);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.progress-actions .btn-secondary:hover {
  background: var(--glass-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.progress-actions .btn-secondary:active {
  transform: translateY(0);
}

/* Progress Bar Animations */
@keyframes progressShimmer {
  0% { left: -100%; }
  100% { left: 100%; }
}

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

/* Responsive Progress Bar */
@media (max-width: 768px) {
  .progress-stats {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }
  
  .progress-actions {
    flex-direction: column;
  }
  
  .progress-info {
    flex-direction: column;
    gap: var(--space-xs);
    text-align: center;
  }
}

/* ===== TOAST NOTIFICATIONS ===== */
.toast-container {
  position: fixed;
  top: 100px;
  right: var(--space-xl);
  z-index: 10000;
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  max-width: 400px;
  width: 100%;
}

.toast {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(20px) saturate(180%);
  animation: slideInRight 0.3s ease-out;
  transform-origin: right center;
  position: relative;
  overflow: hidden;
}

.toast::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--brand-primary);
}

.toast.success::before {
  background: #00ff88;
}

.toast.error::before {
  background: #ff4444;
}

.toast.warning::before {
  background: #ffaa00;
}

.toast.info::before {
  background: #44aaff;
}

.toast-content {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
}

.toast-icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-size: 0.9rem;
}

.toast.success .toast-icon {
  background: rgba(0, 255, 136, 0.2);
  color: #00ff88;
}

.toast.error .toast-icon {
  background: rgba(255, 68, 68, 0.2);
  color: #ff4444;
}

.toast.warning .toast-icon {
  background: rgba(255, 170, 0, 0.2);
  color: #ffaa00;
}

.toast.info .toast-icon {
  background: rgba(68, 170, 255, 0.2);
  color: #44aaff;
}

.toast-body {
  flex: 1;
}

.toast-message {
  color: var(--text-primary);
  font-size: 0.9rem;
  line-height: 1.4;
  font-weight: 500;
}

.toast-close {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: var(--space-xs);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.toast-close:hover {
  color: var(--text-primary);
  background: var(--glass-bg);
}

@keyframes slideInRight {
  0% {
    transform: translateX(100%) scale(0.8);
    opacity: 0;
  }
  100% {
    transform: translateX(0) scale(1);
    opacity: 1;
  }
}

/* ===== MODERN FILE CONVERTER STYLES ===== */
.converter-container {
  max-width: 1000px;
  margin: 0 auto;
  padding: var(--space-2xl);
}

.converter-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.header-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-full);
  color: var(--brand-primary);
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: var(--space-lg);
  backdrop-filter: blur(10px);
}

.converter-title, .batch-title {
  font-size: clamp(2rem, 3.5vw, 2.8rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: var(--space-lg);
}

.converter-subtitle, .batch-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
}

.upload-section {
  margin-bottom: var(--space-2xl);
}

.modern-upload {
  background: var(--glass-bg);
  border: 2px dashed var(--glass-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-3xl);
  text-align: center;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(20px) saturate(180%);
}

.modern-upload:hover {
  border-color: var(--brand-primary);
  background: var(--glass-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
}

.modern-upload.dragover {
  border-color: var(--brand-primary);
  background: linear-gradient(135deg, var(--glass-bg), rgba(255, 0, 0, 0.05));
  animation: pulse 1s ease-in-out infinite;
}

.upload-visual {
  margin-bottom: var(--space-xl);
}

.upload-circle {
  position: relative;
  width: 120px;
  height: 120px;
  margin: 0 auto;
}

.upload-icon-wrapper {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 60px;
  height: 60px;
  background: var(--gradient-brand);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
}

.upload-icon-wrapper i {
  font-size: 1.8rem;
  color: white;
}

.upload-progress-ring {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.progress-ring-circle {
  stroke: var(--glass-border);
  stroke-width: 3;
  fill: transparent;
  stroke-dasharray: 326.56;
  stroke-dashoffset: 326.56;
  transition: stroke-dashoffset 0.5s ease;
}

.upload-title {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.upload-description {
  color: var(--text-secondary);
  margin-bottom: var(--space-lg);
}

.browse-button {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  background: var(--gradient-brand);
  color: white;
  border: none;
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-lg);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  text-decoration: none;
}

.browse-button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-brand);
}

.supported-formats-modern {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  max-width: 500px;
  margin: 0 auto;
}

.format-group {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.format-label {
  font-weight: 600;
  color: var(--text-primary);
  min-width: 80px;
}

.format-tags {
  display: flex;
  gap: var(--space-xs);
  flex-wrap: wrap;
}

.format-tag {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-md);
  font-size: 0.8rem;
  color: var(--text-secondary);
  backdrop-filter: blur(10px);
}

/* Queue Styles */
.conversion-queue {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-xl);
  backdrop-filter: blur(20px) saturate(180%);
}

.queue-header-modern {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--glass-border);
}

.queue-title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
}

.queue-counter {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-left: var(--space-sm);
}

.queue-actions {
  display: flex;
  gap: var(--space-md);
}

.action-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  border: none;
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-lg);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.action-btn.secondary {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-primary);
}

.action-btn.secondary:hover {
  background: var(--glass-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.action-btn.primary {
  background: var(--gradient-brand);
  color: white;
  box-shadow: var(--shadow-brand);
}

.action-btn.primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(255, 0, 0, 0.4);
}

.action-btn.large {
  padding: var(--space-md) var(--space-xl);
  font-size: 1.1rem;
}

.btn-indicator {
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left 0.5s ease;
}

.action-btn:hover .btn-indicator {
  left: 100%;
}

/* ===== MODERN BATCH PROCESSING STYLES ===== */
.batch-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-2xl);
}

.batch-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.batch-workspace {
  display: grid;
  gap: var(--space-2xl);
}

.input-section {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-xl);
  backdrop-filter: blur(20px) saturate(180%);
}

.input-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-lg);
}

.input-title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.input-counter {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.textarea-wrapper {
  position: relative;
}

.modern-textarea {
  width: 100%;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  padding: var(--space-lg);
  font-family: 'JetBrains Mono', 'Consolas', monospace;
  font-size: 0.9rem;
  color: var(--text-primary);
  resize: vertical;
  min-height: 200px;
  backdrop-filter: blur(10px);
  transition: all var(--transition-normal);
}

.modern-textarea:focus {
  outline: none;
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px rgba(255, 0, 0, 0.1);
}

.textarea-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: var(--space-sm);
  padding: 0 var(--space-md);
}

.format-info {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.line-count {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: monospace;
}

.batch-controls {
  display: grid;
  gap: var(--space-xl);
}

.quality-section {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-xl);
  backdrop-filter: blur(20px) saturate(180%);
}

.control-label {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
}

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

.control-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.control-group label {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.9rem;
}

.modern-select {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  color: var(--text-primary);
  cursor: pointer;
  transition: all var(--transition-normal);
  backdrop-filter: blur(10px);
}

.modern-select:focus {
  outline: none;
  border-color: var(--brand-primary);
  box-shadow: 0 0 0 3px rgba(255, 0, 0, 0.1);
}

.action-section {
  display: flex;
  gap: var(--space-lg);
  justify-content: center;
  flex-wrap: wrap;
}

.batch-results {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-xl);
  backdrop-filter: blur(20px) saturate(180%);
}

.results-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-lg);
  border-bottom: 1px solid var(--glass-border);
}

.results-header h3 {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
}

.results-stats {
  display: flex;
  gap: var(--space-lg);
}

.stat {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-weight: 600;
}

.stat.success { color: #10b981; }
.stat.error { color: #ef4444; }
.stat.pending { color: #f59e0b; }

/* ===== CONVERSION SETTINGS STYLES ===== */
.conversion-settings {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-xl);
  margin-bottom: var(--space-xl);
  backdrop-filter: blur(20px) saturate(180%);
}

.settings-header {
  margin-bottom: var(--space-lg);
}

.settings-title {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
}

.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-lg);
}

.setting-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.setting-label {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.9rem;
}

.setting-label i {
  color: var(--brand-primary);
  font-size: 0.8rem;
}

/* Progress Styles */
.conversion-progress {
  margin-top: var(--space-xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--glass-border);
}

.progress-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-lg);
}

.progress-header h4 {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.progress-stats {
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 600;
}

.progress-bar-container {
  position: relative;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  height: 12px;
  overflow: hidden;
}

.progress-bar {
  position: relative;
  width: 100%;
  height: 100%;
}

.progress-fill {
  height: 100%;
  background: var(--gradient-brand);
  border-radius: var(--radius-full);
  width: 0%;
  transition: width 0.3s ease;
  position: relative;
  overflow: hidden;
}

.progress-fill::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
  animation: shimmer 2s infinite;
}

.progress-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-primary);
  z-index: 2;
}

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

/* Queue Item Styles */
.queue-item {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin-bottom: var(--space-md);
  transition: all var(--transition-normal);
}

.queue-item:hover {
  background: var(--glass-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.queue-item-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-md);
}

.file-info {
  flex: 1;
}

.file-name {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
  word-break: break-all;
}

.file-details {
  display: flex;
  gap: var(--space-md);
  font-size: 0.8rem;
  color: var(--text-secondary);
  flex-wrap: wrap;
}

.file-size {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.conversion-settings-item {
  display: flex;
  gap: var(--space-lg);
  margin-bottom: var(--space-md);
}

.format-selector {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  min-width: 150px;
}

.format-selector label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-primary);
}

.format-selector select {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  padding: var(--space-sm);
  color: var(--text-primary);
  font-size: 0.9rem;
}

.queue-item-actions {
  display: flex;
  gap: var(--space-sm);
}

.item-action-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 0.8rem;
}

.item-action-btn.remove {
  background: rgba(239, 68, 68, 0.1);
  color: #ef4444;
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.item-action-btn.remove:hover {
  background: rgba(239, 68, 68, 0.2);
  transform: scale(1.1);
}

.queue-item.processing {
  border-color: var(--brand-primary);
  background: linear-gradient(135deg, var(--glass-bg), rgba(255, 0, 0, 0.05));
}

.queue-item.completed {
  border-color: #10b981;
  background: linear-gradient(135deg, var(--glass-bg), rgba(16, 185, 129, 0.05));
}

.queue-item.error {
  border-color: #ef4444;
  background: linear-gradient(135deg, var(--glass-bg), rgba(239, 68, 68, 0.05));
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-full);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.status-badge.pending {
  background: rgba(245, 158, 11, 0.1);
  color: #f59e0b;
  border: 1px solid rgba(245, 158, 11, 0.2);
}

.status-badge.processing {
  background: rgba(255, 0, 0, 0.1);
  color: var(--brand-primary);
  border: 1px solid rgba(255, 0, 0, 0.2);
}

.status-badge.completed {
  background: rgba(16, 185, 129, 0.1);
  color: #10b981;
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.status-badge.error {
  background: rgba(239, 68, 68, 0.1);
  color: #ef4444;
  border: 1px solid rgba(239, 68, 68, 0.2);
}

/* Batch Result Items */
.result-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md);
  margin-bottom: var(--space-sm);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-normal);
}

.result-item:hover {
  background: var(--glass-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.result-item.valid {
  border-left: 4px solid #10b981;
}

.result-item.invalid {
  border-left: 4px solid #ef4444;
}

.result-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.result-line {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 600;
}

.result-url {
  font-family: 'JetBrains Mono', 'Consolas', monospace;
  font-size: 0.9rem;
  color: var(--text-primary);
  word-break: break-all;
}

.result-status {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.8rem;
  font-weight: 600;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-md);
}

.result-status.success {
  background: rgba(16, 185, 129, 0.1);
  color: #10b981;
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.result-status.error {
  background: rgba(239, 68, 68, 0.1);
  color: #ef4444;
  border: 1px solid rgba(239, 68, 68, 0.2);
}

.conversion-arrow {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.conversion-arrow i {
  color: var(--brand-primary);
}

/* ===== MODERN FEATURES SECTION ===== */
.features-section {
  padding: var(--space-3xl) 0;
  background: linear-gradient(135deg, var(--bg-primary), var(--bg-secondary));
  position: relative;
  overflow: hidden;
}

.features-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--glass-border), transparent);
}

.features-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

.features-header {
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.features-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-full);
  color: var(--brand-primary);
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: var(--space-lg);
  backdrop-filter: blur(10px);
}

.features-title {
  font-size: clamp(2.5rem, 4vw, 3.5rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: var(--space-lg);
}

.title-main {
  display: block;
  color: var(--text-primary);
}

.title-highlight {
  display: block;
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

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

.features-showcase {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-xl);
  margin-bottom: var(--space-3xl);
}

.feature-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-2xl);
  backdrop-filter: blur(20px) saturate(180%);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-brand);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--glass-hover);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-card.premium {
  border-color: var(--brand-primary);
  background: linear-gradient(135deg, var(--glass-bg), rgba(255, 0, 0, 0.05));
}

.feature-card.premium::before {
  opacity: 1;
}

.card-glow {
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 0, 0, 0.1), transparent 70%);
  opacity: 0;
  transition: opacity var(--transition-slow);
  pointer-events: none;
}

.feature-card.premium:hover .card-glow {
  opacity: 1;
}

.feature-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-lg);
}

.feature-icon {
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-xl);
  font-size: 1.5rem;
  transition: all var(--transition-normal);
}

.feature-icon.lightning {
  background: linear-gradient(135deg, #ffeb3b, #ff9800);
  color: #333;
  box-shadow: 0 8px 25px rgba(255, 152, 0, 0.3);
}

.feature-icon.secure {
  background: linear-gradient(135deg, #4caf50, #8bc34a);
  color: white;
  box-shadow: 0 8px 25px rgba(76, 175, 80, 0.3);
}

.feature-icon.smart {
  background: linear-gradient(135deg, #9c27b0, #e91e63);
  color: white;
  box-shadow: 0 8px 25px rgba(156, 39, 176, 0.3);
}

.feature-icon.mobile {
  background: linear-gradient(135deg, #2196f3, #00bcd4);
  color: white;
  box-shadow: 0 8px 25px rgba(33, 150, 243, 0.3);
}

.feature-card:hover .feature-icon {
  transform: scale(1.1) rotate(5deg);
}

.feature-badge {
  background: var(--gradient-brand);
  color: white;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  white-space: nowrap;
}

.feature-card h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
  line-height: 1.3;
  color: var(--text-primary);
}

.feature-card p {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-lg);
}

.feature-metrics {
  display: flex;
  gap: var(--space-lg);
}

.metric {
  text-align: center;
}

.metric-value {
  display: block;
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--brand-primary);
  line-height: 1;
}

.metric-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.features-cta {
  text-align: center;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-2xl);
  backdrop-filter: blur(20px) saturate(180%);
}

.cta-content h3 {
  font-size: 1.8rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}

.cta-content p {
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
  font-size: 1.1rem;
}

.cta-button {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  background: var(--gradient-brand);
  color: white;
  border: none;
  padding: var(--space-lg) var(--space-2xl);
  border-radius: var(--radius-xl);
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-brand);
}

.cta-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 40px rgba(255, 0, 0, 0.4);
}

/* ===== MODERN FOOTER ===== */
.footer {
  background: var(--bg-primary);
  border-top: 1px solid var(--glass-border);
  position: relative;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--glass-border), transparent);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-3xl) var(--space-xl) var(--space-xl);
}

.footer-main {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  margin-bottom: var(--space-2xl);
}

.footer-brand-section {
  max-width: 400px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--brand-primary);
  margin-bottom: var(--space-lg);
}

.footer-brand i {
  font-size: 1.8rem;
}

.footer-description {
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-xl);
}

.footer-stats {
  display: flex;
  gap: var(--space-xl);
}

.footer-stats .stat {
  text-align: center;
}

.footer-stats .stat-number {
  display: block;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--brand-primary);
  line-height: 1;
}

.footer-stats .stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.footer-links-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.link-column h4 {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
}

.link-column h4 i {
  color: var(--brand-primary);
  font-size: 1rem;
}

.link-column a {
  display: block;
  color: var(--text-secondary);
  text-decoration: none;
  margin-bottom: var(--space-sm);
  transition: all var(--transition-fast);
  padding: var(--space-xs) 0;
}

.link-column a:hover {
  color: var(--brand-primary);
  transform: translateX(4px);
}

.footer-bottom {
  padding-top: var(--space-xl);
  border-top: 1px solid var(--glass-border);
}

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

.copyright {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--text-muted);
  font-size: 0.9rem;
}

.copyright i {
  color: var(--brand-primary);
}

.footer-badges {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.badge {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-md);
  font-size: 0.8rem;
  color: var(--text-secondary);
  backdrop-filter: blur(10px);
}

.badge i {
  color: var(--brand-primary);
  font-size: 0.7rem;
}

.badge.codecanyon {
  border-color: #82b440;
  color: #82b440;
}

.badge.version {
  border-color: var(--brand-primary);
  color: var(--brand-primary);
}

.badge.secure {
  border-color: #4caf50;
  color: #4caf50;
}

/* Utility Classes */
.hidden {
  display: none !important;
}


/* Responsive Design */
@media (max-width: 768px) {
  .nav-container {
    height: 70px;
    padding: 0 var(--space-md);
    gap: var(--space-md);
    display: flex;
    justify-content: space-between;
  }
  
  .nav-center {
    display: none;
  }
  
  .hero-section {
    min-height: calc(100vh - 70px);
    padding: var(--space-xl) var(--space-md);
  }
  
  .download-interface {
    padding: var(--space-lg);
  }
  
  .interface-tabs {
    flex-direction: column;
  }
  
  .input-group {
    flex-direction: column;
  }
  
  .preview-content {
    flex-direction: column;
    text-align: center;
  }
  
  .video-thumbnail {
    width: 100%;
    max-width: 300px;
    height: auto;
    aspect-ratio: 16/9;
  }
  
  .video-meta {
    gap: var(--space-md);
  }
  
  .options-header {
    flex-direction: column;
    align-items: stretch;
  }
  
  .format-toggle {
    align-self: stretch;
  }
  
  .toast-container {
    top: 80px;
    right: var(--space-md);
    left: var(--space-md);
    max-width: none;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 2.5rem;
  }
  
  .premium-card {
    padding: var(--space-lg);
  }
  
  .card-header {
    flex-direction: column;
    text-align: center;
    gap: var(--space-md);
  }
  
  .video-preview {
    padding: var(--space-lg);
  }
  
  .meta-item {
    justify-content: center;
  }
  
  .features-showcase {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
  
  .footer-main {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
  
  .footer-stats {
    justify-content: center;
  }
  
  .footer-links-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
  }
  
  .footer-bottom-content {
    flex-direction: column;
    text-align: center;
  }
  
  .footer-badges {
    justify-content: center;
  }
}

@media (max-width: 640px) {
  .footer-links-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-stats {
    flex-direction: column;
    gap: var(--space-md);
  }
  
  .features-cta {
    padding: var(--space-lg);
  }
  
  .cta-content h3 {
    font-size: 1.5rem;
  }
  
  /* Modern converter & batch responsive */
  .converter-container, .batch-container {
    padding: var(--space-lg);
  }
  
  .supported-formats-modern {
    flex-direction: column;
    align-items: center;
  }
  
  .format-group {
    flex-direction: column;
    text-align: center;
    gap: var(--space-sm);
  }
  
  .upload-circle {
    width: 100px;
    height: 100px;
  }
  
  .upload-icon-wrapper {
    width: 50px;
    height: 50px;
  }
  
  .upload-icon-wrapper i {
    font-size: 1.5rem;
  }
  
  .queue-header-modern {
    flex-direction: column;
    gap: var(--space-md);
    align-items: stretch;
  }
  
  .queue-actions {
    justify-content: center;
  }
  
  .action-section {
    flex-direction: column;
    align-items: stretch;
  }
  
  .control-grid {
    grid-template-columns: 1fr;
  }
  
  .textarea-footer {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }
  
  .results-header {
    flex-direction: column;
    gap: var(--space-md);
    align-items: stretch;
  }
  
  .results-stats {
    justify-content: center;
  }
}