body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: #f0f2f5;
  margin: 0;
  padding: 0;
}
#app-root {
  max-width: 1100px;
  margin: 30px auto;
  padding: 30px;
  background: #ffffff;
  border-radius: 20px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.05);
}
h1 {
  font-size: 2em;
  margin-bottom: 20px;
}
.tabs {
  display: flex;
  margin-bottom: 20px;
  gap: 10px;
}
.tab-btn {
  flex: 1;
  padding: 12px 20px;
  background: #e0e0e0;
  border: none;
  border-radius: 10px;
  font-weight: bold;
  cursor: pointer;
  transition: background 0.2s;
}
.tab-btn.active {
  background-color: #007BFF;
  color: white;
}
.tab-btn:hover {
  background-color: #c0c0c0;
}
form label {
  display: block;
  margin: 12px 0 6px;
}
input[type="text"] {
  width: 100%;
  padding: 10px;
  border-radius: 8px;
  border: 1px solid #ccc;
  box-sizing: border-box;
}
section {
  margin: 30px 0;
}
.table-scroll {
  max-height: 200px;
  overflow-y: auto;
  border-radius: 10px;
  border: 1px solid #ccc;
  background: #fafafa;
}
table {
  width: 100%;
  border-collapse: collapse;
}
th {
  background-color: #f5f5f5;
}
th, td {
  border: 1px solid #ddd;
  padding: 10px;
  text-align: left;
}
.chart-placeholder {
  width: 300px;
  height: 200px;
  background: #fff;
  border-radius: 10px;
  border: 1px solid #ccc;
  margin-top: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.chart-placeholder img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}