* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f3f4f6;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

.container {
  background-color: white;
  padding: 30px;
  border-radius: 16px;
  box-shadow: 0 8px 16px rgba(0,0,0,0.1);
  max-width: 800px;
  width: 100%;
}

h1 {
  text-align: center;
  margin-bottom: 30px;
  color: #1f2937;
}

.offers {
  display: flex;
  gap: 20px;
  justify-content: space-between;
  margin-bottom: 30px;
}

.offer {
  flex: 1;
  padding: 20px;
  background-color: #f9fafb;
  border-radius: 12px;
  border: 1px solid #e5e7eb;
}

.offer h2 {
  margin-bottom: 15px;
  color: #111827;
  font-size: 20px;
}

.offer input,
.offer select {
  display: block;
  width: 100%;
  padding: 10px;
  margin-bottom: 15px;
  border-radius: 8px;
  border: 1px solid #d1d5db;
  font-size: 14px;
  background-color: #ffffff;
}

button {
  width: 100%;
  padding: 12px;
  font-size: 16px;
  background-color: #2563eb;
  color: white;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: background-color 0.2s ease;
  font-weight: 600;
}

button:hover {
  background-color: #1e40af;
}

#result {
  margin-top: 25px;
  font-size: 16px;
  font-weight: 500;
  text-align: center;
  color: #10b981;
}