:root {
  --primary-color: #0052CC;
  --secondary-color: #172B4D;
  --accent-color: #36B37E;
  --light-bg: #F4F5F7;
  --border-color: #DFE1E6;
  --text-color: #172B4D;
  --text-light: #6B778C;
  --white: #FFFFFF;
  --shadow: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--light-bg);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

header {
  background-color: var(--white);
  padding: 20px 0;
  box-shadow: var(--shadow);
  margin-bottom: 30px;
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

h1, h2, h3, h4 {
  color: var(--secondary-color);
  margin-bottom: 15px;
}

h1 {
  font-size: 2.2rem;
  font-weight: 600;
}

h2 {
  font-size: 1.8rem;
  font-weight: 500;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 10px;
  margin-top: 40px;
}

h3 {
  font-size: 1.4rem;
  font-weight: 500;
  margin-top: 30px;
}

p {
  margin-bottom: 15px;
}

.card {
  background-color: var(--white);
  border-radius: 3px;
  box-shadow: var(--shadow);
  padding: 20px;
  margin-bottom: 20px;
}

.chart-container {
  height: 400px;
  margin-bottom: 30px;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 30px;
}

.data-table th, .data-table td {
  padding: 12px 15px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.data-table th {
  background-color: var(--light-bg);
  font-weight: 600;
}

.data-table tr:hover {
  background-color: var(--light-bg);
}

.highlight {
  color: var(--primary-color);
  font-weight: 600;
}

.positive {
  color: var(--accent-color);
}

.negative {
  color: #FF5630;
}

.neutral {
  color: #FF991F;
}

.review-card {
  background-color: var(--white);
  border-left: 4px solid var(--primary-color);
  padding: 15px;
  margin-bottom: 15px;
  border-radius: 3px;
  box-shadow: var(--shadow);
}

.review-card .stars {
  color: #FF991F;
  margin-bottom: 5px;
}

.review-card .date {
  color: var(--text-light);
  font-size: 0.9rem;
  margin-bottom: 10px;
}

.review-card .text {
  font-style: italic;
}

.summary-box {
  display: flex;
  justify-content: space-between;
  margin-bottom: 30px;
}

.summary-item {
  flex: 1;
  background-color: var(--white);
  padding: 20px;
  border-radius: 3px;
  box-shadow: var(--shadow);
  margin: 0 10px;
  text-align: center;
}

.summary-item:first-child {
  margin-left: 0;
}

.summary-item:last-child {
  margin-right: 0;
}

.summary-item .value {
  font-size: 2rem;
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: 10px;
}

.summary-item .label {
  color: var(--text-light);
  font-size: 0.9rem;
}

.tabs {
  display: flex;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}

.tab {
  padding: 10px 20px;
  cursor: pointer;
  border-bottom: 3px solid transparent;
}

.tab.active {
  border-bottom: 3px solid var(--primary-color);
  font-weight: 600;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

footer {
  background-color: var(--secondary-color);
  color: var(--white);
  padding: 20px 0;
  margin-top: 50px;
  text-align: center;
}

@media (max-width: 768px) {
  .container {
    padding: 10px;
  }
  
  .summary-box {
    flex-direction: column;
  }
  
  .summary-item {
    margin: 0 0 10px 0;
  }
  
  .chart-container {
    height: 300px;
  }
}