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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #f0f0f0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.cf-wrapper {
  width: 100%;
  max-width: 480px;
  padding: 2rem;
}

.cf-card {
  background: white;
  border-radius: 12px;
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.08);
  overflow: hidden;
}

.cf-header {
  padding: 1.5rem 2rem;
  border-bottom: 1px solid #eee;
  text-align: center;
}

.cf-body {
  padding: 2rem;
  text-align: center;
}

.cf-shield {
  margin-bottom: 1.5rem;
}

.cf-title {
  font-size: 1.4rem;
  font-weight: 700;
  color: #1a1a1a;
  margin-bottom: 0.5rem;
}

.cf-subtitle {
  font-size: 0.9rem;
  color: #666;
  margin-bottom: 2rem;
}

.cf-challenge {
  background: #fafafa;
  border: 1px solid #e5e5e5;
  border-radius: 8px;
  padding: 2rem;
  margin-bottom: 1.5rem;
  min-height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.cf-spinner {
  display: flex;
  align-items: center;
  justify-content: center;
}

.spinner-ring {
  width: 40px;
  height: 40px;
  border: 3px solid #e5e5e5;
  border-top-color: #F48120;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

.cf-verify-content {
  width: 100%;
}

.verify-instruction {
  font-size: 0.9rem;
  font-weight: 600;
  color: #333;
  margin-bottom: 1rem;
}

.verify-steps {
  text-align: left;
  margin-bottom: 1.5rem;
}

.step {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 0;
  font-size: 0.85rem;
  color: #444;
}

.step-num {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #F48120;
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
}

kbd {
  background: #eee;
  border: 1px solid #ccc;
  border-radius: 3px;
  padding: 0.1rem 0.4rem;
  font-size: 0.8rem;
  font-family: monospace;
}

.cf-copy-btn {
  width: 100%;
  padding: 0.8rem;
  background: #F48120;
  color: white;
  border: none;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.cf-copy-btn:hover {
  background: #d96f10;
}

.cf-copy-btn.copied {
  background: #28a745;
}

.cf-note {
  margin-top: 1rem;
  font-size: 0.8rem;
  color: #888;
}

.cf-footer-info {
  font-size: 0.75rem;
  color: #999;
}

.cf-footer-info p {
  line-height: 1.5;
}