:root {
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --bg-color: #f9fafb;
  --text-color: #1f2937;
  --card-bg: #ffffff;
  --border-color: #e5e7eb;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

.container {
  background: var(--card-bg);
  padding: 2.5rem;
  border-radius: 12px;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  max-width: 400px;
  width: 100%;
  text-align: center;
}

h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: #111827;
}

h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

p {
  color: #6b7280;
  margin-bottom: 1.5rem;
  line-height: 1.5;
}

.product {
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.price {
  font-size: 2rem;
  font-weight: 800;
  color: #111827;
  margin: 1rem 0;
}

input {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  margin-bottom: 1rem;
  font-size: 1rem;
  box-sizing: border-box;
}

input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

button {
  background-color: var(--primary);
  color: white;
  border: none;
  padding: 0.875rem 1.5rem;
  border-radius: 6px;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  width: 100%;
  transition: background-color 0.2s;
}

button:hover {
  background-color: var(--primary-dark);
}

.spinner {
  border: 4px solid #f3f3f3;
  border-top: 4px solid var(--primary);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
  margin: 20px auto;
}

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

#success h2 { color: #10b981; }
#pending h2 { color: #f59e0b; }
#nameMismatch h2 { color: #ef4444; }

.amount span {
  font-weight: bold;
  color: #111827;
}