:root {
  /* Purple scale */
  --color-purple-darkest: #4a148c;
  --color-purple-dark: #6a1b9a;
  --color-purple-medium: #7e57c2;
  --color-purple-light: #b39ddb;
  --color-purple-lightest: #d1c4e9;
  --color-purple-pale: #CCBEE7;
  
  /* Blue scale */
  --color-blue-dark: #1565c0;
  --color-blue-medium: #42a5f5;
  --color-blue-badge: #5C9ED1;
  
  /* Backgrounds */
  --bg-body: #BEC5E7;
  --bg-white: white;
  
  /* Semantic color names */
  --text-primary: var(--color-purple-darkest);
  --text-secondary: var(--color-purple-dark);
  --border-primary: var(--color-purple-light);
  --border-secondary: var(--color-purple-lightest);
  --accent-comments: var(--color-blue-medium);
  --accent-complete: var(--color-blue-dark);
  
  /* Typography - Font Sizes */
  --font-size-xs: 10px;
  --font-size-sm: 11px;
  --font-size-base: 12px;
  --font-size-md: 14px;
  --font-size-lg: 15px;
  --font-size-xl: 16px;
  --font-size-2xl: 18px;
  
  /* Typography - Font Weights */
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  
  /* Typography - Line Heights */
  --line-height-tight: 1.3;
  --line-height-normal: 1.4;
  --line-height-relaxed: 1.6;
  --line-height-loose: 1.7;
  
  /* Spacing */
  --spacing-xs: 2px;
  --spacing-sm: 4px;
  --spacing-md: 6px;
  --spacing-lg: 8px;
  --spacing-xl: 16px;
  --spacing-2xl: 20px;
}

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

/* === BODY === */
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  font-weight: var(--font-weight-light);
  background: var(--bg-body);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* === HEADER === */
.header {
  background: linear-gradient(to bottom, var(--color-purple-pale), var(--color-purple-medium));
  border-bottom: var(--spacing-xs) solid var(--border-primary);
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-xs) var(--spacing-lg);
}

.header-title {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.header-title span {
  color: var(--bg-white);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-light);
}

.window-controls {
  display: flex;
  gap: var(--spacing-xs);
}

.window-controls button {
  background: rgba(255, 255, 255, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.4);
  color: var(--bg-white);
  padding: 0 var(--spacing-md);
  font-size: var(--font-size-base);
  cursor: pointer;
  font-weight: var(--font-weight-light);
}

.window-controls button:hover {
  background: rgba(255, 255, 255, 0.3);
}

.window-controls button.active {
  background: rgba(0, 0, 0, 0.15);
  border-color: rgba(0, 0, 0, 0.2);
}

.window-controls button.active:hover {
  background: rgba(0, 0, 0, 0.2);
}

/* === MAIN CONTAINER === */
.main-container {
  display: flex;
  flex: 1;
}

/* === BASE COMPONENT SYSTEM === */

/* Base List Component */
.base-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.base-list-item, .base-list-item a {
  border-bottom: 1px solid var(--border-secondary);
  padding: var(--spacing-xs) 0;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-light);
  color: var(--text-primary);
  text-decoration: none;
}

.base-list-item:last-child {
  border-bottom: none;
}

/* List Modifiers */
.base-list-item--card {
  border: 1px solid var(--border-primary);
  padding: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
}

.base-list-item--card:last-child {
  margin-bottom: 0;
  border-bottom: 1px solid var(--border-primary);
}

.base-list-item--compact {
  padding: var(--spacing-xs) var(--spacing-sm);
}

.base-list-item--no-border {
  border-bottom: none;
}

/* Text Elements within Lists/Grids */
.item-title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-light);
  color: var(--text-primary);
  margin: 0;
}

.item-subtitle {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin: 0;
}

.item-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-sm);
}

.item-comments {
  color: var(--accent-comments);
  font-size: var(--font-size-sm);
  white-space: nowrap;
}

/* Base Grid Component */
.base-grid {
  display: grid;
  gap: var(--spacing-sm);
}

.base-grid--2col {
  grid-template-columns: 1fr 1fr;
}

.base-grid--3col {
  grid-template-columns: repeat(3, 1fr);
}

.base-grid-item {
  border: 1px solid var(--border-primary);
  padding: var(--spacing-sm);
}

.base-grid-item--center {
  text-align: center;
}

/* === SIDEBAR === */
.sidebar {
  width: 160px;
  background: var(--bg-white);
  transition: transform 0.3s ease, opacity 0.3s ease;
  transform: translateX(0);
  opacity: 1;
}

.sidebar-left {
  border-right: var(--spacing-xs) solid var(--border-primary);
}

.sidebar-left.hidden {
  transform: translateX(-100%);
  opacity: 0;
  pointer-events: none;
}

.sidebar-right {
  border-left: var(--spacing-xs) solid var(--border-primary);
  width: 176px;
}

.sidebar-right.hidden {
  transform: translateX(100%);
  opacity: 0;
  pointer-events: none;
}

.sidebar-header {
  background: linear-gradient(to top, var(--color-purple-pale), var(--bg-white));
  border-bottom: var(--spacing-xs) solid var(--border-primary);
  padding: var(--spacing-xs) var(--spacing-md);
}

.sidebar-header h2 {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  color: var(--text-primary);
}

/* Sidebar hover effects for compact items */
.base-list-item--compact {
  cursor: pointer;
}

.base-list-item--compact:hover {
  background: var(--border-secondary);
}

.base-list-item--compact a {
  color: var(--text-primary);
  text-decoration: none;
}

/* Sidebar Tabbed Section */
.sidebar-tabs {
  display: flex;
  border-bottom: 1px solid var(--border-primary);
}

.sidebar-tab {
  flex: 1;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-light);
  background: linear-gradient(to top, var(--color-purple-pale), var(--bg-white));
  border-bottom: var(--spacing-xs) solid var(--border-primary);
  border-right: 1px solid var(--border-secondary);
  border-top: 0;
  border-left: 0;
  cursor: pointer;
  color: var(--text-secondary);
}

.sidebar-tab:last-child {
  border-right: none;
}

.sidebar-tab.active {
  background: linear-gradient(to bottom, var(--color-purple-pale), var(--bg-white));
  font-weight: var(--font-weight-normal);
}

.sidebar-tab:hover {
  background: var(--border-secondary);
}

.sidebar-tab-content {
  display: none;
}

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

/* === MAIN CONTENT === */
.main-content {
  flex: 1;
  padding: var(--spacing-md);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-md);
  transition: all 0.3s ease;
}

/* Content Box Grid Spanning */
.content-box-wide {
  grid-column: span 2;
}

.content-box-half {
  grid-column: span 1;
}

.content-box-full {
  grid-column: span 3;
}

/* Content Box Structure */
.content-box {
  border: var(--spacing-xs) solid var(--border-primary);
  background: var(--bg-white);
}

.content-box-header {
  background: linear-gradient(to bottom, var(--bg-white), var(--color-purple-pale));
  border-bottom: 1px solid var(--border-primary);
  padding: var(--spacing-xs) var(--spacing-md);
}

.content-box-header h3 {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  color: var(--text-primary);
}

.content-box-body {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-light);
  color: var(--text-primary);
}

.content-box-wide .content-box-body {
  padding: var(--spacing-sm);
}

/* Custom Box Content */
.box-subtitle {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  color: var(--text-primary);
  display: block;
  margin-bottom: var(--spacing-sm);
}

.box-paragraph {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-light);
  color: var(--text-primary);
  margin: 0;
  line-height: var(--line-height-normal);
}

/* Stats - Definition List (keeping this specific component as it uses <dl>) */
.stat-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.stat-item {
  display: flex;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-secondary);
  padding: var(--spacing-xs) 0;
  font-size: var(--font-size-base);
}

.stat-item:last-child {
  border-bottom: none;
}

.stat-list dt {
  font-weight: var(--font-weight-light);
}

.stat-list dd {
  margin: 0;
  font-weight: var(--font-weight-light);
}

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

.in-progress {
  color: var(--accent-comments);
}

/* Stat numbers in grids */
.stat-number {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-light);
  color: var(--text-primary);
}

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

/* News Badge */
.news-badge {
  background: var(--color-blue-badge);
  color: var(--bg-white);
  font-size: var(--font-size-xs);
  padding: 1px var(--spacing-md);
  flex-shrink: 0;
  border-radius: var(--spacing-lg);
}

/* === STATUS BAR === */
.status-bar {
  background: var(--border-secondary);
  border-top: var(--spacing-xs) solid var(--border-primary);
  padding: 0 var(--spacing-lg);
  display: flex;
  justify-content: space-between;
}

.status-bar span {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-light);
  color: var(--text-primary);
}

/* Sidebar sections should keep bottom borders on last items */
.sidebar .base-list-item:last-child {
  border-bottom: 1px solid var(--border-secondary);
}

/* Base link styles */
a {
  color: var(--text-primary);
  text-decoration: none;
}

a:hover {
  color: var(--text-secondary);
  text-decoration: underline;
}

a:visited {
  color: var(--text-secondary);
}

/* Expanded mode links */
.main-content.expanded a {
  color: var(--text-primary);
}

.main-content.expanded a:hover {
  color: var(--text-secondary);
  text-decoration: underline;
}

/* === EXPANDED STATE - ACCESSIBILITY MODE === */
.main-content.expanded {
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
  max-width: 900px;
  margin: 0 auto;
  padding: var(--spacing-xl);
}

.main-content.expanded .content-box-body {
  padding: var(--spacing-xl) var(--spacing-2xl);
  font-size: 18px;
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-loose);
}

.main-content.expanded .content-box-header h3 {
  font-size: 24px;
  font-weight: var(--font-weight-medium);
}

/* All text elements scale consistently */
.main-content.expanded .item-title,
.main-content.expanded .base-list-item,
.main-content.expanded .stat-item dt,
.main-content.expanded .stat-item dd {
  font-size: 18px;
  font-weight: var(--font-weight-normal);
}

.main-content.expanded .item-subtitle,
.main-content.expanded .item-comments,
.main-content.expanded .stat-label {
  font-size: 16px;
  font-weight: var(--font-weight-normal);
}

.main-content.expanded .box-subtitle {
  font-size: 20px;
  font-weight: var(--font-weight-medium);
}

.main-content.expanded .box-paragraph {
  font-size: 18px;
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-loose);
}

.main-content.expanded .stat-number {
  font-size: 28px;
  font-weight: var(--font-weight-normal);
}

/* Single column layout for better readability */
.main-content.expanded .content-box-wide,
.main-content.expanded .content-box-half,
.main-content.expanded .content-box-full {
  grid-column: span 1;
}

/* Larger grids in expanded mode */
.main-content.expanded .base-grid {
  gap: var(--spacing-lg);
}

.main-content.expanded .base-grid--3col {
  grid-template-columns: repeat(2, 1fr);
}

/* More spacing for list items in expanded mode */
.main-content.expanded .base-list-item {
  padding: var(--spacing-lg) 0;
}

.main-content.expanded .base-list-item--card {
  padding: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
}

.main-content.expanded .base-list-item a {
  font-size: 18px;
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height-relaxed);
  text-decoration: none;
  border-bottom: none;
}

.main-content.expanded .base-list-item a:hover {
  text-decoration: none;
}

/* === RESPONSIVE MEDIA QUERIES === */
/* Medium screens - 2 columns */
@media (max-width: 1200px) {
  .main-content {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .content-box-wide {
    grid-column: span 2;
  }
  
  .content-box-half {
    grid-column: span 1;
  }
  
  .content-box-full {
    grid-column: span 2;
  }
}

/* Small screens - 1 column */
@media (max-width: 768px) {
  .main-content {
    grid-template-columns: 1fr;
  }
  
  .content-box-wide,
  .content-box-half,
  .content-box-full {
    grid-column: span 1;
  }
  
  .sidebar-left,
  .sidebar-right {
    display: none;
  }
  
  .main-content {
    padding: var(--spacing-sm);
  }
}