:root {
  --gold: #FFD700;
  --silver: #C0C0C0;
  --bronze: #CD7F32;
  --primary: #4F46E5;
  --primary-dark: #4338CA;
  --secondary: #64748B;
  --success: #10B981;
  --error: #EF4444;
  --bg-light: #F8FAFC;
  --bg-white: #FFFFFF;
  --text-dark: #1E293B;
  --text-muted: #64748B;
  --border: #E2E8F0;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  color: var(--text-dark);
  line-height: 1.6;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

header {
  background: var(--bg-white);
  padding: 2rem;
  border-radius: 1rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  margin-bottom: 2rem;
}

header h1 {
  font-size: 2rem;
  color: var(--text-dark);
  margin-bottom: 1rem;
}

main {
  background: var(--bg-white);
  padding: 2rem;
  border-radius: 1rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 0.5rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  display: inline-block;
  text-align: center;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--primary);
  color: white;
}

.btn-primary:hover:not(:disabled) {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(79, 70, 229, 0.3);
}

.btn-secondary {
  background: var(--secondary);
  color: white;
}

.btn-secondary:hover:not(:disabled) {
  background: #475569;
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(100, 116, 139, 0.3);
}

.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.loading-overlay.hidden {
  display: none;
}

.spinner {
  width: 50px;
  height: 50px;
  border: 4px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

.loading-overlay p {
  color: white;
  margin-top: 1rem;
  font-size: 1.1rem;
}

.error-message {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: white;
  padding: 2rem;
  border-radius: 0.5rem;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
  z-index: 1001;
  max-width: 90%;
  width: 400px;
}

.error-message p {
  color: var(--error);
  margin-bottom: 1rem;
  font-weight: 500;
}

.progress-bar {
  position: relative;
  height: 30px;
  background: var(--bg-light);
  border-radius: 15px;
  overflow: hidden;
  margin-top: 1rem;
}

.progress-fill {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--primary-dark));
  transition: width 0.5s ease;
  border-radius: 15px;
}

.progress-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-weight: 600;
  color: var(--text-dark);
  z-index: 1;
}

@media (max-width: 768px) {
  .container {
    padding: 1rem;
  }

  header {
    padding: 1.5rem;
  }

  header h1 {
    font-size: 1.5rem;
  }

  main {
    padding: 1.5rem;
  }
}