:root {
  --color-primary: #0047ab;
  --color-secondary: #f4f6fa;
  --color-text: #333;
  --color-background: #ffffff;
  --color-border: #cccccc;
  --color-highlight: #ff6666;
  --color-hover: #0056b3;
  --font-family-sans: 'Arial', sans-serif;
  --font-size-base: 16px;
  --font-size-header: 1.6rem;
  --font-size-subheader: 1.3rem;
  --spacing-small: 8px;
  --spacing-medium: 16px;
  --spacing-large: 24px;
  --border-radius: 4px;
  --box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

body {
  font-family: var(--font-family-sans);
  font-size: var(--font-size-base);
  color: var(--color-text);
  background-color: var(--color-secondary);
  margin: 0;
  padding: 0;
}

#app-container {
  display: grid;
  grid-template-columns: 200px 1fr;
  grid-template-rows: auto 1fr;
  height: 100vh;
  grid-template-areas: 
    "header header"
    "sidebar main";
}

.app-header {
  grid-area: header;
  background-color: var(--color-primary);
  color: var(--color-background);
  padding: var(--spacing-medium);
  text-align: center;
  box-shadow: var(--box-shadow);
}

.sidebar {
  grid-area: sidebar;
  background-color: var(--color-background);
  box-shadow: var(--box-shadow);
  padding: var(--spacing-medium);
}

.sidebar ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.sidebar li {
  margin-bottom: var(--spacing-small);
}

.sidebar a {
  color: var(--color-text);
  text-decoration: none;
  font-weight: bold;
  transition: color 0.3s;
}

.sidebar a:hover {
  color: var(--color-hover);
}

.main-content {
  grid-area: main;
  background-color: var(--color-background);
  padding: var(--spacing-large);
  overflow-y: auto;
}

.view {
  display: none;
}

.view:target {
  display: block;
}

.controls {
  display: flex;
  align-items: center;
  gap: var(--spacing-medium);
  margin-bottom: var(--spacing-medium);
}

.controls label {
  font-size: var(--font-size-base);
}

.controls select,
.controls button,
.controls input {
  padding: var(--spacing-small);
  font-size: var(--font-size-base);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  background-color: var(--color-background);
  cursor: pointer;
  transition: background-color 0.3s, transform 0.2s;
}

.controls button:hover,
.controls select:hover,
.controls input:hover {
  background-color: var(--color-secondary);
  transform: scale(1.02);
}

.chart-container {
  width: 100%;
  margin: var(--spacing-large) 0;
  padding: var(--spacing-medium);
  background-color: var(--color-background);
  box-shadow: var(--box-shadow);
  border-radius: var(--border-radius);
}

#data-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: var(--spacing-large);
}

#data-table th,
#data-table td {
  padding: var(--spacing-small);
  text-align: left;
  border: 1px solid var(--color-border);
}

#data-table th {
  background-color: var(--color-primary);
  color: var(--color-background);
  font-weight: bold;
}

#data-table tr:nth-child(even) {
  background-color: var(--color-secondary);
}

#data-table tr:hover {
  background-color: var(--color-highlight);
  color: var(--color-background);
}

.anomaly {
  background-color: var(--color-highlight) !important;
  color: var(--color-background);
}

#performance-chart { 
  width: 800px; 
  height: 400px; 
}

@media (max-width: 768px) {
  #app-container {
    grid-template-areas: 
      "header"
      "main";
    grid-template-rows: auto 1fr;
    grid-template-columns: 1fr;
  }

  .sidebar {
    display: none;
  }
}

/* Accessibility enhancements */
.controls select,
.controls input {
  outline: none;
}

.controls select:focus,
.controls input:focus {
  box-shadow: 0 0 0 3px var(--color-primary);
}

.sidebar a,
.controls button {
  font-size: 1.1rem;
}

#data-table th, #data-table td {
  font-size: var(--font-size-base);
}

button {
  line-height: 1.5;
  text-transform: none;
}