body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 20px;
  background-color: #f4f4f4;
  color: #333;
  text-align: center;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
}

h2 {
  color: #007BFF;
  font-weight: bold;
  margin-bottom: 16px;
  font-size: 20px;
}

.flex-layout {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 20px;
}

.input-panel {
  flex: 1;
  max-width: 33%;
}

.chart-panel {
  flex: 2;
  max-width: 67%;
  position: relative;
}

.panel-title {
  font-size: 18px;
  font-weight: bold;
  text-align: center;
  margin-bottom: 10px;
  color: #007BFF;
  text-transform: uppercase;
}

#dataTable {
  border-collapse: collapse;
  font-size: 12px;
  margin: auto;
  width: 100%;
}

#dataTable th,
#dataTable td {
  border: 1px solid #ccc;
  padding: 2px 4px;
  text-align: center;
  white-space: nowrap;
}

.time-input,
.distance-input {
  width: 60px;
  padding: 2px;
  font-size: 12px;
  text-align: center;
}

select {
  padding: 2px 4px;
  font-size: 12px;
  width: 80px;
}

button {
  padding: 4px 8px;
  font-size: 12px;
  border-radius: 4px;
  cursor: pointer;
  margin: 2px;
}

#addRowBtn {
  background-color: #17a2b8;
  color: white;
  border: none;
}

#drawGraphBtn {
  background-color: #28a745;
  color: white;
  border: none;
}

#analyzeBtn {
  background-color: #ffc107;
  color: black;
  border: none;
}

.remove-row {
  background-color: transparent;
  border: none;
  font-size: 16px;
  color: #dc3545;
  cursor: pointer;
}

.remove-row:hover {
  color: #a71d2a;
}

.chart-panel canvas {
  width: 100% !important;
  height: 400px !important;
  background: white;
  border: 1px solid #ddd;
  border-radius: 8px;
}

/* PHÂN TÍCH ĐỒ THỊ - POPUP CỐ ĐỊNH */
.analysis-box {
  position: fixed;
  bottom: 10;
  right: 30;
  margin-right: 20px; /* căn sát hoặc điều chỉnh lề */
  width: 48.5%;          /* đúng bằng cột chart-panel */
  max-width: 800px;
  background-color: #fff;
  border: 2px solid #ccc;
  border-radius: 8px;
  padding: 20px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  font-size: 14px;
  z-index: 1000;
  text-align: left;
}

.analysis-box h3 {
  color: #007bff;
  margin-bottom: 10px;
}

.analysis-box .close-analysis {
  position: absolute;
  top: 10px;
  right: 14px;
  font-size: 22px;
  font-weight: bold;
  cursor: pointer;
  color: #555;
}

.analysis-box ul {
  list-style-position: inside;
  padding-left: 0;
  margin-left: 0;
  text-align: left;
}

.analysis-box li {
  margin-bottom: 4px;
  padding-left: 0;
  text-align: left;
}