body {
  font-family: 'Segoe UI', sans-serif;
  background: #f9f9f9;
  margin: 0;
  padding: 20px;
}

.container {
  max-width: 800px;
  margin: auto;
  background: #fff;
  padding: 30px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  border-radius: 8px;
}

h1, h2 {
  text-align: center;
}

.input-group {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.input-group label {
  margin-top: 10px;
}

.input-group input {
  padding: 8px;
  font-size: 16px;
}

.input-group button,
#exportBtn {
  padding: 10px;
  font-size: 18px;
  background-color: #0078D7;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

.input-group button:hover,
#exportBtn:hover {
  background-color: #005fa3;
}

#result {
  margin-top: 20px;
  text-align: center;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 20px;
}

thead {
  background-color: #0078D7;
  color: white;
}

table, th, td {
  border: 1px solid #ccc;
}

th, td {
  padding: 10px;
  text-align: center;
}

/* 🌙 Dark Mode */
body.dark {
  background-color: #121212;
  color: #e0e0e0;
}

body.dark .container {
  background: #1e1e1e;
  box-shadow: none;
}

body.dark input,
body.dark button {
  background-color: #333;
  color: #fff;
  border: 1px solid #666;
}

body.dark table {
  border-color: #444;
}

body.dark thead {
  background-color: #333;
}