body {
  font-family: 'Segoe UI', sans-serif;
  background: #f9f9f9;
  padding: 40px 20px;
}

.tool-tabs {
  max-width: 600px;
  margin: auto;
  background: white;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.05);
}

h2 {
  text-align: center;
  margin-bottom: 20px;
}

.tabs {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 20px;
}

.tab-btn {
  padding: 10px 20px;
  border: none;
  background: #eee;
  border-radius: 5px;
  font-weight: 600;
  cursor: pointer;
}

.tab-btn.active {
  background-color: #00c896;
  color: white;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

input, select {
  width: 100%;
  padding: 10px;
  margin: 8px 0;
  border-radius: 6px;
  border: 1px solid #ccc;
  font-size: 16px;
}

button[type="submit"] {
  width: 100%;
  padding: 12px;
  background-color: #00c896;
  color: white;
  border: none;
  font-size: 16px;
  margin-top: 10px;
  cursor: pointer;
  border-radius: 6px;
}

button[type="submit"]:hover {
  background-color: #00b083;
}

.result {
  margin-top: 20px;
  font-weight: bold;
  text-align: center;
  color: #333;
}