:root {
  --color-primary: #00B2FF;
  --color-primary-dark: #0095e8;
  --color-secondary: #6C63FF;
  --color-accent: #00FFCC;
  --color-violet: #8B5CF6;
  --color-purple: #A855F7;
  --color-indigo: #6366F1;
  --color-dark: #0A1525;
  --color-darker: #050D1A;
  --color-darkest: #030912;
  --color-light: #f5f9fc;
  --color-gray: #8C9CAD;
  --color-gray-light: #E1E9F2;
  --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 50%, var(--color-violet) 100%);
  --gradient-accent: linear-gradient(135deg, var(--color-primary) 0%, var(--color-purple) 100%);
  --gradient-violet: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-violet) 100%);
  --gradient-rainbow: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 25%, var(--color-violet) 50%, var(--color-purple) 75%, var(--color-indigo) 100%);
  --gradient-background: linear-gradient(135deg, var(--color-darker) 0%, #0D4377 50%, #1e1b4b 100%);
  --gradient-text: linear-gradient(135deg, var(--color-primary) 0%, var(--color-violet) 100%);
  --gradient-highlight: linear-gradient(135deg, #00B2FF 0%, #8B5CF6 50%, #A855F7 100%);
  --glass-bg: rgba(10, 21, 37, 0.7);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-highlight: rgba(255, 255, 255, 0.05);
  --font-primary: 'Space Grotesk', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-md: 1.125rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 2.5rem;
  --font-size-4xl: 3rem;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2.5rem;
  --spacing-xl: 4rem;
  --spacing-2xl: 6rem;
  --border-radius-sm: 8px;
  --border-radius-md: 12px;
  --border-radius-lg: 24px;
  --border-radius-pill: 9999px;
  --box-shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.1);
  --box-shadow-md: 0 10px 30px rgba(0, 0, 0, 0.15);
  --box-shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.2);
  --glow-gradient: 0 0 30px rgba(0, 178, 255, 0.4);
  --glow-violet: 0 0 30px rgba(139, 92, 246, 0.3);
  --transition-fast: all 0.2s ease;
  --transition-normal: all 0.3s ease;
  --transition-slow: all 0.5s ease;
  --container-max-width: 1200px;
  --container-padding: 2rem;
}

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

body {
  font-family: var(--font-primary);
  line-height: 1.6;
  color: var(--color-light);
  background: var(--gradient-background);
  overflow-x: hidden;
  min-height: 100vh;
}

.background-animation {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  background: var(--gradient-background);
}

.cloud {
  position: absolute;
  background: var(--gradient-primary);
  border-radius: 50%;
  opacity: 0.3;
  animation: float 25s infinite linear;
  filter: blur(2px);
  box-shadow: var(--glow-gradient);
}

.cloud:before {
  content: '';
  position: absolute;
  background: var(--gradient-violet);
  border-radius: 50%;
}

.cloud1 {
  width: 100px;
  height: 40px;
  top: 20%;
  left: -100px;
  animation-delay: 0s;
}

.cloud2 {
  width: 80px;
  height: 30px;
  top: 50%;
  left: -80px;
  animation-delay: -5s;
}

.cloud3 {
  width: 120px;
  height: 50px;
  top: 80%;
  left: -120px;
  animation-delay: -10s;
}

@keyframes float {
  0%, 100% { 
    transform: translateX(0) translateY(0) rotate(0deg) scale(1); 
  }
  25% { 
    transform: translateX(calc(25vw)) translateY(-20px) rotate(90deg) scale(1.1); 
  }
  50% { 
    transform: translateX(calc(50vw)) translateY(10px) rotate(180deg) scale(0.9); 
  }
  75% { 
    transform: translateX(calc(75vw)) translateY(-15px) rotate(270deg) scale(1.05); 
  }
  100% { 
    transform: translateX(calc(100vw + 200px)) translateY(0) rotate(360deg) scale(1); 
  }
}

/* Navigation */
.navbar {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  position: sticky;
  top: 0;
  z-index: 100;
  padding: var(--spacing-sm) 0;
  box-shadow: var(--box-shadow-md);
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: var(--font-size-xl);
  font-weight: 700;
  background: var(--gradient-highlight);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 10px var(--color-primary));
}

.nav-logo i {
  font-size: var(--font-size-2xl);
  color: var(--color-primary);
  filter: drop-shadow(0 0 10px var(--color-primary));
}

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

.nav-link {
  text-decoration: none;
  color: var(--color-light);
  font-weight: 600;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius-md);
  transition: var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.nav-link::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--gradient-primary);
  opacity: 0;
  transition: var(--transition-normal);
}

.nav-link:hover, 
.nav-link.active {
  color: var(--color-light);
  transform: translateY(-2px);
  box-shadow: var(--glow-gradient);
}

.nav-link:hover::before,
.nav-link.active::before {
  opacity: 0.2;
}

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

.main-content {
  min-height: calc(100vh - 80px);
  padding: var(--spacing-lg) 0;
}

.hero-section {
  text-align: center;
  padding: var(--spacing-xl) 0;
  background: var(--glass-bg);
  backdrop-filter: blur(30px);
  border-radius: var(--border-radius-lg);
  margin: var(--spacing-lg) 0;
  box-shadow: var(--box-shadow-lg);
  border: 1px solid var(--glass-border);
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--gradient-primary);
  opacity: 0.1;
  z-index: -1;
}

.hero-title {
  font-size: var(--font-size-4xl);
  font-weight: 800;
  margin-bottom: var(--spacing-md);
  line-height: 1.1;
}

.gradient-text {
  background: var(--gradient-highlight);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  filter: drop-shadow(0 0 20px var(--color-primary));
}

.hero-description {
  font-size: var(--font-size-lg);
  color: var(--color-gray);
  margin-bottom: var(--spacing-lg);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.7;
}

.hero-buttons {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-lg);
  border: none;
  border-radius: var(--border-radius-lg);
  font-size: var(--font-size-base);
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: 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 0.5s;
}

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

.btn-primary {
  background: var(--gradient-primary);
  color: var(--color-light);
  box-shadow: var(--glow-gradient);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 0 40px rgba(0, 178, 255, 0.6);
  filter: brightness(1.1);
}

.btn-secondary {
  background: transparent;
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
  backdrop-filter: blur(15px);
}

.btn-secondary:hover {
  background: var(--color-primary);
  color: var(--color-light);
  transform: translateY(-2px);
  box-shadow: var(--glow-gradient);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* Features Section */
.features-section {
  padding: var(--spacing-xl) 0;
}

.section-title {
  text-align: center;
  font-size: var(--font-size-3xl);
  font-weight: 700;
  margin-bottom: var(--spacing-xl);
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.feature-card {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
  box-shadow: var(--box-shadow-md);
  border: 1px solid var(--glass-border);
  transition: var(--transition-normal);
  position: relative;
  overflow: hidden;
}

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

.feature-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--glow-violet);
  border-color: var(--color-violet);
}

.feature-card:hover::before {
  opacity: 0.1;
}

.feature-icon {
  width: 80px;
  height: 80px;
  background: var(--gradient-accent);
  border-radius: var(--border-radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--spacing-md);
  color: var(--color-light);
  font-size: var(--font-size-2xl);
  box-shadow: var(--glow-gradient);
  position: relative;
  z-index: 2;
}

.feature-card h3 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--color-light);
  position: relative;
  z-index: 2;
}

.feature-card p {
  color: var(--color-gray);
  line-height: 1.6;
  position: relative;
  z-index: 2;
}

.upload-container, 
.download-container {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--box-shadow-lg);
  margin: var(--spacing-lg) 0;
  border: 1px solid var(--glass-border);
  position: relative;
  overflow: hidden;
}

.upload-container::before,
.download-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--gradient-primary);
  opacity: 0.05;
  z-index: -1;
}

.upload-header, 
.download-header {
  text-align: center;
  margin-bottom: var(--spacing-lg);
}

.upload-header h1, 
.download-header h1 {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--color-light);
  margin-bottom: var(--spacing-xs);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
}

.upload-header p, 
.download-header p {
  color: var(--color-gray);
  font-size: var(--font-size-md);
}

.file-drop-zone {
  border: 3px dashed var(--color-primary);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  text-align: center;
  background: rgba(0, 178, 255, 0.05);
  margin-bottom: var(--spacing-lg);
  transition: var(--transition-normal);
  cursor: pointer;
  position: relative;
  backdrop-filter: blur(10px);
}

.file-drop-zone:hover, 
.file-drop-zone.drag-over {
  border-color: var(--color-violet);
  background: rgba(139, 92, 246, 0.1);
  transform: scale(1.02);
  box-shadow: var(--glow-violet);
}

.drop-icon {
  font-size: var(--font-size-4xl);
  color: var(--color-primary);
  margin-bottom: var(--spacing-sm);
  transition: var(--transition-normal);
  filter: drop-shadow(0 0 10px var(--color-primary));
}

.file-drop-zone:hover .drop-icon, 
.file-drop-zone.drag-over .drop-icon {
  color: var(--color-violet);
  transform: scale(1.1);
}

.drop-zone-content h3 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-light);
  margin-bottom: var(--spacing-xs);
}

.drop-zone-content p {
  color: var(--color-gray);
  font-size: var(--font-size-md);
}

#fileInput {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

/* Selected Files */
.selected-files {
  margin-bottom: var(--spacing-lg);
}

.file-item {
  background: var(--glass-bg);
  border-radius: var(--border-radius-md);
  padding: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-left: 4px solid var(--color-primary);
  backdrop-filter: blur(10px);
  transition: var(--transition-normal);
  border: 1px solid var(--glass-border);
}

.file-item:hover {
  transform: translateX(5px);
  box-shadow: var(--glow-gradient);
}

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

.file-icon {
  width: 50px;
  height: 50px;
  background: var(--gradient-accent);
  border-radius: var(--border-radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-light);
  font-size: var(--font-size-xl);
  box-shadow: var(--glow-gradient);
}

.file-details h4 {
  font-weight: 600;
  color: var(--color-light);
  margin-bottom: 0.25rem;
}

.file-details p {
  color: var(--color-gray);
  font-size: var(--font-size-sm);
}

.upload-controls {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
}

/* Progress Section */
.progress-section {
  margin: var(--spacing-lg) 0;
}

.progress-card {
  background: var(--glass-bg);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  border-left: 6px solid var(--color-primary);
  backdrop-filter: blur(20px);
  box-shadow: var(--box-shadow-lg);
  border: 1px solid var(--glass-border);
}

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

.progress-header h3 {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-light);
}

.progress-status {
  font-size: var(--font-size-lg);
  font-weight: 700;
  background: var(--gradient-text);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.progress-bar-container {
  margin-bottom: var(--spacing-md);
}

.progress-bar {
  width: 100%;
  height: 12px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 6px;
  overflow: hidden;
  position: relative;
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.3);
}

.progress-fill {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: 6px;
  transition: width 0.3s ease;
  position: relative;
  box-shadow: var(--glow-gradient);
}

.progress-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, transparent 30%, rgba(255,255,255,0.3) 50%, transparent 70%);
  animation: shimmer 2s infinite;
}

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

.progress-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-sm);
}

.stat-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm);
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--border-radius-md);
  box-shadow: var(--box-shadow-sm);
  border: 1px solid var(--glass-border);
  transition: var(--transition-normal);
}

.stat-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--glow-gradient);
}

.stat-item i {
  color: var(--color-primary);
  width: 20px;
  text-align: center;
}

.stat-item span {
  color: var(--color-gray);
  flex: 1;
}

.stat-item strong {
  color: var(--color-light);
  font-weight: 700;
}

.upload-result, 
.download-result, 
.download-error, 
.file-info {
  margin: var(--spacing-lg) 0;
}

.result-card, 
.info-card {
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--box-shadow-md);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
}

.result-card.success, 
.info-card {
  background: linear-gradient(135deg, rgba(0, 255, 204, 0.1), var(--glass-bg));
  border-left: 6px solid var(--color-accent);
  box-shadow: 0 0 30px rgba(0, 255, 204, 0.2);
}

.result-card.error {
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.1), var(--glass-bg));
  border-left: 6px solid #ef4444;
  box-shadow: 0 0 30px rgba(239, 68, 68, 0.2);
}

.result-header, 
.info-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
}

.result-header i {
  font-size: var(--font-size-xl);
}

.result-card.success .result-header i, 
.info-header i {
  color: var(--color-accent);
}

.result-card.error .result-header i {
  color: #ef4444;
}

.result-header h3, 
.info-header h3 {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-light);
}

.download-link-container {
  margin-bottom: var(--spacing-md);
}

.download-link-container label {
  display: block;
  font-weight: 600;
  color: var(--color-light);
  margin-bottom: var(--spacing-xs);
}

.link-box {
  display: flex;
  gap: var(--spacing-xs);
}

.link-box input {
  flex: 1;
  padding: var(--spacing-sm);
  border: 2px solid var(--glass-border);
  border-radius: var(--border-radius-md);
  background: var(--glass-bg);
  font-family: monospace;
  color: var(--color-light);
  backdrop-filter: blur(10px);
  transition: var(--transition-normal);
}

.link-box input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: var(--glow-gradient);
}

.copy-btn {
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--gradient-primary);
  border: none;
  border-radius: var(--border-radius-md);
  color: var(--color-light);
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition-normal);
  box-shadow: var(--glow-gradient);
}

.copy-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 40px rgba(0, 178, 255, 0.6);
  filter: brightness(1.1);
}

.result-actions {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.download-input-section {
  margin-bottom: var(--spacing-lg);
}

.input-group {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xs);
}

.input-group input {
  flex: 1;
  padding: var(--spacing-sm);
  border: 2px solid var(--glass-border);
  border-radius: var(--border-radius-md);
  font-size: var(--font-size-base);
  background: var(--glass-bg);
  color: var(--color-light);
  transition: var(--transition-normal);
  backdrop-filter: blur(10px);
}

.input-group input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: var(--glow-gradient);
}

.input-help {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--color-gray);
  font-size: var(--font-size-sm);
}

.input-help i {
  color: var(--color-primary);
}

.info-content {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.info-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-xs) 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

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

.info-row span {
  color: var(--color-gray);
}

.info-row strong {
  color: var(--color-light);
  font-weight: 600;
}

/* Log Section */
.log-section {
  margin-top: var(--spacing-xl);
}

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

.log-header h3 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-light);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.clear-log-btn {
  background: none;
  border: none;
  color: var(--color-gray);
  cursor: pointer;
  padding: var(--spacing-xs);
  border-radius: var(--border-radius-sm);
  transition: var(--transition-normal);
}

.clear-log-btn:hover {
  background: rgba(239, 68, 68, 0.1);
  color: #ef4444;
}

.log-container {
  background: var(--color-darkest);
  color: var(--color-light);
  font-family: 'SF Mono', monospace;
  font-size: var(--font-size-sm);
  padding: var(--spacing-md);
  border-radius: var(--border-radius-md);
  height: 300px;
  overflow-y: auto;
  border: 1px solid var(--glass-border);
  white-space: pre-wrap;
  line-height: 1.4;
  box-shadow: inset 0 2px 20px rgba(0, 0, 0, 0.5);
}

.log-container::-webkit-scrollbar {
  width: 6px;
}

.log-container::-webkit-scrollbar-track {
  background: rgba(0, 0, 0, 0.3);
}

.log-container::-webkit-scrollbar-thumb {
  background: var(--color-primary);
  border-radius: 3px;
}

.footer {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  text-align: center;
  padding: var(--spacing-lg) 0;
  border-top: 1px solid var(--glass-border);
  color: var(--color-gray);
  box-shadow: 0 -4px 25px rgba(0, 0, 0, 0.2);
}

@media (max-width: 768px) {
  :root {
    --font-size-4xl: 2.5rem;
    --font-size-3xl: 2rem;
    --font-size-2xl: 1.75rem;
    --font-size-xl: 1.25rem;
    --container-padding: 1rem;
  }

  .container {
    padding: 0 var(--spacing-sm);
  }

  .hero-title {
    font-size: var(--font-size-3xl);
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .nav-container {
    padding: 0 var(--spacing-sm);
  }

  .nav-links {
    gap: var(--spacing-sm);
  }

  .upload-container, 
  .download-container {
    padding: var(--spacing-md);
  }

  .file-drop-zone {
    padding: var(--spacing-lg) var(--spacing-sm);
  }

  .progress-stats {
    grid-template-columns: 1fr;
  }

  .input-group {
    flex-direction: column;
  }

  .result-actions {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: var(--font-size-2xl);
  }

  .upload-header h1, 
  .download-header h1 {
    font-size: var(--font-size-2xl);
  }

  .feature-card {
    padding: var(--spacing-lg) var(--spacing-md);
  }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(50px); }
  to { opacity: 1; transform: translateY(0); }
}

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

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

.fade-in {
  animation: fadeIn 0.8s ease-out;
}

.slide-up {
  animation: slideUp 0.8s ease-out;
}

.result-card.success {
  animation: pulse 0.6s ease-out;
}

.loading-spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(255,255,255,0.2);
  border-radius: 50%;
  border-top-color: var(--color-primary);
  animation: spin 1s ease-in-out infinite;
}

::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-darker);
}

::-webkit-scrollbar-thumb {
  background: var(--gradient-primary);
  border-radius: 6px;
  transition: background 0.3s ease;
}

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