body {
  font-family: system-ui, -apple-system, sans-serif;
  margin: 0;
  padding: 0;
  display: flex;
  height: 100vh;
  background: #f8f9fa;
}

#sidebar {
  width: 320px;
  background: #ffffff;
  padding: 20px;
  box-shadow: 2px 0 5px rgba(0, 0, 0, 0.05);
  overflow-y: auto;
}

#main {
  flex-grow: 1;
  padding: 20px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

#plot {
  flex-grow: 1;
  width: 100%;
  height: 100%;
  background: white;
  border-radius: 8px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

h2 {
  font-size: 1.2rem;
  margin-top: 0;
  color: #333;
}

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

label {
  display: block;
  font-weight: 600;
  font-size: 0.85rem;
  margin-bottom: 5px;
  color: #555;
}

input[type="file"],
input[type="number"] {
  width: 100%;
  padding: 8px;
  border: 1px solid #ccc;
  border-radius: 4px;
  box-sizing: border-box;
}

.checkbox-group {
  display: flex;
  align-items: center;
  gap: 8px;
}

.checkbox-group input {
  width: auto;
}

button {
  width: 100%;
  padding: 10px;
  background: #0066cc;
  color: white;
  border: none;
  border-radius: 4px;
  font-weight: bold;
  cursor: pointer;
  transition: background 0.2s;
}

button:hover {
  background: #0052a3;
}

.results {
  margin-top: 20px;
  padding: 15px;
  background: #eef2f5;
  border-radius: 4px;
  font-size: 0.9rem;
  display: none;
}

.results strong {
  color: #0066cc;
}