/* Critical CSS for above-the-fold content - loads first */

/* Essential variables and base styles */
:root {
  --primary-purple: #8B5CF6;
  --glass-bg: rgba(139, 92, 246, 0.1);
  --text-primary: #F8FAFC;
}

/* Critical layout styles */
body {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  background-attachment: fixed;
  min-height: 100vh;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text-primary);
  margin: 0;
  padding: 0;
}

/* Container and layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* Essential glassmorphism card */
.glass-card {
  background: rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 20px;
  box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
}

/* Critical header styles */
.main-header h1 {
  font-size: 3.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, #C4B5FD, #8B5CF6);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-align: center;
  margin: 1rem 0;
}

/* Essential button styles */
.btn-primary {
  background: linear-gradient(135deg, var(--primary-purple), #A855F7);
  border: none;
  border-radius: 12px;
  color: white;
  padding: 12px 24px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s;
}

.btn-primary:hover {
  transform: translateY(-2px);
}

/* File input styling */
.file-input-wrapper {
  position: relative;
  overflow: hidden;
  display: inline-block;
  width: 100%;
}

.file-input-wrapper input[type=file] {
  position: absolute;
  left: -9999px;
}

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

.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid #ffffff;
  border-radius: 50%;
  border-top-color: transparent;
  animation: spin 1s linear infinite;
}

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

/* Mobile-first responsive design */
@media (max-width: 768px) {
  .main-header h1 {
    font-size: 2.5rem;
  }
  
  .container {
    padding: 0 0.5rem;
  }
  
  .glass-card {
    margin: 1rem 0;
    padding: 1.5rem;
  }
}