* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f5f7fa;
  color: #1a1f29;
}

.container {
  max-width: 1300px;
  margin: 0 auto;
  padding: 16px;
}

.header h1 {
  margin: 0 0 8px;
}

.header p {
  margin: 0 0 20px;
  color: #445066;
}

.controls {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  background: #ffffff;
  padding: 14px;
  border-radius: 10px;
  border: 1px solid #d5dbe5;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.control-group label {
  font-size: 13px;
  color: #334056;
}

.control-group input,
.control-group select {
  height: 36px;
  border: 1px solid #c9d2df;
  border-radius: 8px;
  padding: 0 10px;
  background: #ffffff;
  color: #1a1f29;
}

.control-group select {
  appearance: none;
}

.checkbox-group {
  flex-direction: row;
  align-items: center;
  gap: 8px;
  min-height: 36px;
  padding: 0 8px;
  border: 1px solid #c9d2df;
  border-radius: 8px;
}

.checkbox-group input[type="checkbox"] {
  width: 18px;
  height: 18px;
  margin: 0;
  padding: 0;
  border: 0;
}

.checkbox-group label {
  margin: 0;
  font-size: 12px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.summary {
  margin-top: 16px;
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.class-info {
  margin-top: 14px;
  background: #ffffff;
  border: 1px solid #d5dbe5;
  border-radius: 10px;
  padding: 12px;
  font-size: 13px;
  color: #2b3648;
}

.class-info strong {
  color: #1a1f29;
}

.class-info .class-grid {
  margin-top: 8px;
  display: grid;
  gap: 6px;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

.summary-card {
  background: #ffffff;
  border: 1px solid #d5dbe5;
  border-radius: 10px;
  padding: 12px;
}

.summary-card h2 {
  font-size: 14px;
  margin: 0 0 8px;
  color: #334056;
}

.summary-card p {
  margin: 0;
  font-size: 21px;
  font-weight: 600;
}

.summary-card .summary-calc {
  display: inline;
  margin-left: 8px;
  font-size: 13px;
  font-weight: 400;
  color: #56637b;
}

.chart-panel {
  margin-top: 16px;
  background: #ffffff;
  border: 1px solid #d5dbe5;
  border-radius: 10px;
  padding: 10px;
}

#chart {
  width: 100%;
  height: 560px;
}