body {
  background-color: #f3f4f6;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh; /* Changed to min-height for better mobile scrolling */
  margin: 0;
  padding: 20px; /* Adds breathing room on mobile edges */
  box-sizing: border-box;
}

.card {
  background: white;
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  
  /* RESPONSIVE WIDTH SETTINGS */
  width: 90%;       /* Fits 90% of screen on mobile */
  max-width: 400px; /* Stops growing at 400px on desktop */
  margin: 0 auto;
}

/* Centered Title */
h2 {
  margin-top: 0;
  font-size: 18px;
  margin-bottom: 10px;
  text-align: center;
}

.form-group { margin-bottom: 15px; }

label {
  display: block;
  margin-bottom: 5px;
  font-size: 14px;
  color: #333;
  font-weight: 500;
}

.input-field {
  width: 100%;
  padding: 12px;
  border: 1px solid #ddd;
  border-radius: 6px;
  box-sizing: border-box;
  font-size: 16px; /* 16px prevents iOS zooming on focus */
}

.total-section {
  background-color: #f9fafb;
  padding: 1rem;
  border-radius: 6px;
  margin: 1.5rem 0;
}

hr { border: 0; border-top: 1px solid #eee; margin: 20px 0; }
p { margin: 5px 0; color: #555; font-size: 14px; }

button {
  width: 100%;
  padding: 15px;
  border: none;
  border-radius: 6px;
  font-size: 16px;
  font-weight: bold;
  cursor: pointer;
  background-color: #ccc;
  color: white;
  transition: background 0.2s;
}

button:enabled {
  background-color: #4f46e5;
}