* {
  box-sizing: border-box;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #f4f6f9;
  color: #2c3e50;
  margin: 0;
  padding: 0;
}

.container {
  max-width: 1000px;
  margin: 20px auto;
  padding: 15px;
}

h1 {
  text-align: center;
  color: #2c3e50;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 20px;
  background: white;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  border-radius: 8px;
  overflow: hidden;
}

th, td {
  padding: 12px 10px;
  text-align: left;
  border-bottom: 1px solid #ecf0f1;
}

th {
  background: #3498db;
  color: white;
  font-weight: 600;
}

tr:hover {
  background-color: #f8f9fa;
}

.loader {
  text-align: center;
  margin: 20px 0;
  color: #7f8c8d;
  font-style: italic;
}

.positive {
  color: #27ae60;
  font-weight: bold;
}

.negative {
  color: #e74c3c;
  font-weight: bold;
}

footer {
  text-align: center;
  margin-top: 40px;
  color: #95a5a6;
  font-size: 0.9em;
}