/* AI Theme Variables */
:root {
  --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  --dark-bg: #0f0f23;
  --card-bg: #1a1a2e;
  --text-primary: #ffffff;
  --text-secondary: #b8b8d1;
  --accent-blue: #4f46e5;
  --accent-purple: #7c3aed;
  --success-color: #10b981;
  --error-color: #ef4444;
  --border-radius: 12px;
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--dark-bg);
  background-image: 
    radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
    radial-gradient(circle at 80% 20%, rgba(255, 119, 198, 0.3) 0%, transparent 50%),
    radial-gradient(circle at 40% 40%, rgba(120, 119, 198, 0.2) 0%, transparent 50%);
  min-height: 100vh;
  color: var(--text-primary);
  line-height: 1.6;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

header {
  text-align: center;
  margin-bottom: 3rem;
  position: relative;
}

header::before {
  content: '';
  position: absolute;
  top: -20px;
  left: 50%;
  transform: translateX(-50%);
  width: 100px;
  height: 4px;
  background: var(--primary-gradient);
  border-radius: 2px;
}

header h1 {
  font-size: 3rem;
  font-weight: 700;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
  text-align: center;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 1.2rem;
  font-weight: 400;
  margin-top: 0.5rem;
}

main {
  width: 100%;
  max-width: 500px;
}

.upload-card {
  background: var(--card-bg);
  border-radius: var(--border-radius);
  padding: 3rem;
  box-shadow: var(--shadow-xl);
  border: 1px solid rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
}

.upload-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--primary-gradient);
}

.upload-form {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.form-label {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.ai-icon {
  width: 20px;
  height: 20px;
  background: var(--primary-gradient);
  border-radius: 4px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
}

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

.file-input {
  position: absolute;
  left: -9999px;
  opacity: 0;
}

.file-input-button {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 1.25rem 2rem;
  background: rgba(255, 255, 255, 0.05);
  border: 2px dashed rgba(255, 255, 255, 0.2);
  border-radius: var(--border-radius);
  color: var(--text-secondary);
  font-size: 1rem;
  cursor: pointer;
  transition: all 0.3s ease;
  text-align: center;
  min-height: 120px;
  flex-direction: column;
}

.file-input-button:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--accent-blue);
  color: var(--text-primary);
  transform: translateY(-2px);
}

.file-input-button.has-file {
  background: rgba(79, 70, 229, 0.1);
  border-color: var(--accent-blue);
  color: var(--text-primary);
}

.upload-icon {
  width: 48px;
  height: 48px;
  background: var(--primary-gradient);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: 0.5rem;
}

.process-button {
  background: var(--primary-gradient);
  color: white;
  border: none;
  border-radius: var(--border-radius);
  padding: 1.25rem 2rem;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  box-shadow: var(--shadow-lg);
}

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

.process-button:active {
  transform: translateY(0);
}

.process-button::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;
}

.process-button:hover::before {
  left: 100%;
}

.process-button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.button-content {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.button-icon {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Loading Spinner */
.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top: 2px solid white;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Flash Messages */
.flashes {
  list-style: none;
  margin-bottom: 2rem;
  width: 100%;
}

.flashes li {
  padding: 1rem 1.5rem;
  border-radius: var(--border-radius);
  margin-bottom: 1rem;
  font-weight: 500;
  border-left: 4px solid;
  backdrop-filter: blur(10px);
}

.flashes li.error {
  background: rgba(239, 68, 68, 0.1);
  color: #fca5a5;
  border-left-color: var(--error-color);
}

.flashes li.success {
  background: rgba(16, 185, 129, 0.1);
  color: #6ee7b7;
  border-left-color: var(--success-color);
}

/* Footer */
.footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(26, 26, 46, 0.9);
  backdrop-filter: blur(10px);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 1rem 2rem;
  text-align: center;
}

.powered-by {
  color: var(--text-secondary);
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.ai-badge {
  background: var(--primary-gradient);
  color: white;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 1rem;
  }
  
  header h1 {
    font-size: 2.5rem;
  }
  
  .upload-card {
    padding: 2rem;
  }
  
  .footer {
    padding: 1rem;
  }
  
  .powered-by {
    flex-direction: column;
    gap: 0.25rem;
  }
}

@media (max-width: 480px) {
  header h1 {
    font-size: 2rem;
  }
  
  .upload-card {
    padding: 1.5rem;
  }
  
  .process-button {
    padding: 1rem 1.5rem;
    font-size: 1rem;
  }
}

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

.upload-card {
  animation: fadeInUp 0.6s ease-out;
}

header {
  animation: fadeInUp 0.6s ease-out 0.2s both;
}

/* Loading Overlay */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(15, 15, 35, 0.95);
  backdrop-filter: blur(5px);
  display: none;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  flex-direction: column;
  gap: 2rem;
}

.loading-overlay.show {
  display: flex;
}

.loading-content {
  text-align: center;
  color: var(--text-primary);
}

.loading-spinner {
  width: 60px;
  height: 60px;
  border: 4px solid rgba(255, 255, 255, 0.1);
  border-top: 4px solid var(--accent-blue);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 1.5rem;
}

.loading-text {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.loading-subtext {
  color: var(--text-secondary);
  font-size: 1rem;
}