:root {
  /* Primary */
  --primary-color: #0078d4;
  --primary-dark: #005a9e;
  --primary-light: #0091ff;
  
  /* Accent */
  --accent-green: #107c10;
  --accent-orange: #f06402;
  --accent-red: #e81123;
  
  /* Neutral Colors */
  --text-primary: #333333;
  --text-secondary: #666666;
  --text-tertiary: #999999;
  --background-light: #f8f8f8;
  --card-background: #ffffff;
  --border-color: rgba(0, 0, 0, 0.1);
  
  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-xxl: 3rem;
  
  /* Type */
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.5rem;
  --font-size-xxl: 2rem;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-medium: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  
  /* Z-index layers */
  --z-dropdown: 100;
  --z-header: 200;
  --z-overlay: 300;
  --z-modal: 400;
  --z-toast: 500;
}

/* Dark mode var */
.dark-theme {
  --primary-color: #3a96dd;
  --primary-dark: #2a7ab9;
  --primary-light: #4ba9f5;
  
  --text-primary: #e0e0e0;
  --text-secondary: #b0b0b0;
  --text-tertiary: #888888;
  --background-light: #1a1a1a;
  --card-background: #252525;
  --border-color: rgba(255, 255, 255, 0.1);
  
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
}

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

body {
  font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: var(--font-size-md);
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--background-light);
  transition: background-color var(--transition-medium), color var(--transition-medium);
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background-color: var(--card-background);
  box-shadow: var(--shadow-sm);
  border-bottom: 1px solid var(--border-color);
  padding: var(--space-sm) 0;
}

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

.site-header .logo {
  display: flex;
  align-items: center;
}

.site-header .logo a {
  display: flex;
  align-items: center;
  font-weight: 600;
  font-size: var(--font-size-lg);
  color: var(--text-primary);
  text-decoration: none;
}

.site-header .logo img {
  height: 32px;
  margin-right: var(--space-sm);
}

.main-nav ul {
  display: flex;
  list-style: none;
  gap: var(--space-lg);
}

.main-nav .nav-link {
  color: var(--text-primary);
  font-weight: 500;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

.main-nav .nav-link:hover {
  background-color: rgba(0, 0, 0, 0.05);
  text-decoration: none;
}

.dark-theme .main-nav .nav-link:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.dropdown {
  position: relative;
}

.dropdown-content {
  position: absolute;
  top: 100%;
  left: 0;
  background-color: var(--card-background);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  min-width: 180px;
  z-index: var(--z-dropdown);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all var(--transition-medium);
}

.dropdown:hover .dropdown-content {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-content a {
  display: block;
  padding: var(--space-sm) var(--space-md);
  color: var(--text-primary);
  transition: background-color var(--transition-fast);
}

.dropdown-content a:hover {
  background-color: rgba(0, 0, 0, 0.05);
  text-decoration: none;
}

.dark-theme .dropdown-content a:hover {
  background-color: rgba(255, 255, 255, 0.05);
}

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

.header-actions button {
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color var(--transition-fast);
}

.header-actions button:hover {
  background-color: rgba(0, 0, 0, 0.05);
}

.dark-theme .header-actions button:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.theme-toggle .icon-sun {
  display: none;
}

.dark-theme .theme-toggle .icon-moon {
  display: none;
}

.dark-theme .theme-toggle .icon-sun {
  display: block;
}

.menu-toggle {
  display: none;
}

.settings-button {
  position: fixed;
  top: 15px;
  right: 15px;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  font-size: 24px;
  z-index: 1001;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: rgba(0, 0, 0, 0.05);
  transition: background-color var(--transition-fast);
}

.settings-button:hover {
  background-color: rgba(0, 0, 0, 0.1);
}

.dark-theme .settings-button {
  color: var(--text-primary);
  background-color: rgba(255, 255, 255, 0.1);
}

.dark-theme .settings-button:hover {
  background-color: rgba(255, 255, 255, 0.15);
}

.page-content {
  padding: var(--space-xl) 0;
}

.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: var(--space-xl);
  font-size: var(--font-size-sm);
  color: var(--text-tertiary);
}

.breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

.breadcrumb-separator {
  margin: 0 var(--space-xs);
}

.breadcrumb img {
  height: 16px;
  vertical-align: middle;
  margin-right: 4px;
}

.content-section {
  background-color: var(--card-background);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  padding: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.content-section h2 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-md);
  color: var(--text-primary);
  font-weight: 600;
}

.content-section h3 {
  font-size: var(--font-size-lg);
  margin-top: var(--space-lg);
  margin-bottom: var(--space-sm);
  color: var(--text-primary);
}

.content-section p {
  margin-bottom: var(--space-md);
  color: var(--text-secondary);
}

.collapsible-panel {
  margin-bottom: var(--space-md);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.collapsible-header {
  background-color: var(--primary-color);
  color: white;
  padding: var(--space-md);
  font-weight: 500;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background-color var(--transition-fast);
}

.collapsible-header:hover {
  background-color: var(--primary-dark);
}

.collapsible-header::after {
  content: '+';
  font-size: 1.5rem;
  transition: transform var(--transition-medium);
}

.collapsible-header.active::after {
  transform: rotate(45deg);
}

.collapsible-content {
  background-color: var(--card-background);
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-medium);
  border: 1px solid var(--border-color);
  border-top: none;
  border-bottom-left-radius: var(--radius-md);
  border-bottom-right-radius: var(--radius-md);
}

.collapsible-inner {
  padding: var(--space-lg);
}

.release-version {
  font-weight: 600;
  color: var(--text-primary);
}

.release-date {
  font-size: var(--font-size-sm);
  color: var(--text-tertiary);
  margin-top: var(--space-sm);
}

.feature-list {
  margin: var(--space-md) 0;
  padding-left: var(--space-lg);
}

.feature-item {
  margin-bottom: var(--space-sm);
}

.feature-new {
  color: var(--accent-green);
  font-weight: 500;
}

.feature-removed {
  color: var(--accent-red);
  text-decoration: line-through;
}

.bug-section {
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--border-color);
}

.bug-item {
  display: flex;
  align-items: flex-start;
  margin-bottom: var(--space-sm);
}

.bug-item img {
  margin-right: var(--space-xs);
}

.archive-link {
  margin-top: var(--space-md);
  font-size: var(--font-size-sm);
  display: flex;
  align-items: center;
}

.archive-link svg {
  margin-left: var(--space-xs);
}

.archive-note {
  font-style: italic;
  color: var(--text-tertiary);
  font-size: var(--font-size-sm);
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-lg);
    margin: var(--space-lg) 0;
}

.card {
    background-color: var(--card-background);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: transform var(--transition-medium), box-shadow var(--transition-medium);
    overflow: hidden;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.card-header {
    padding: var(--space-md);
    border-bottom: 1px solid var(--border-color);
}

.card-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.card-content {
    padding: var(--space-md);
}

.card-footer {
    padding: var(--space-md);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    align-items: center;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    font-weight: 500;
    border: none;
    cursor: pointer;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
    text-decoration: none;
}

.btn:hover {
    transform: translateY(-1px);
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    color: white;
    text-decoration: none;
}

.btn-secondary {
    background-color: rgba(0, 0, 0, 0.05);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background-color: rgba(0, 0, 0, 0.1);
    color: var(--text-primary);
    text-decoration: none;
}

.dark-theme .btn-secondary {
    background-color: rgba(255, 255, 255, 0.1);
}

.dark-theme .btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.15);
}

.cta-section {
    margin-top: var(--space-xl);
    text-align: center;
}

@media (max-width: 768px) {
    .grid {
        grid-template-columns: 1fr;
    }
}

.switch {
  position: relative;
  display: inline-block;
  width: 60px;
  height: 34px;
  margin-right: 10px;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.slider {
  position: absolute;
  cursor: pointer;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: #ccc;
  transition: 0.4s;
  border-radius: 34px;
}

.slider:before {
  position: absolute;
  content: "";
  height: 26px;
  width: 26px;
  left: 4px;
  bottom: 4px;
  background-color: white;
  transition: 0.4s;
  border-radius: 50%;
}

input:checked + .slider {
  background-color: var(--primary-color);
}

input:checked + .slider:before {
  transform: translateX(26px);
}

.settings-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 2000;
}

.settings-content {
  background-color: var(--card-background);
  padding: 20px;
  margin: 15% auto;
  width: 300px;
  border-radius: var(--radius-lg);
  position: relative;
  text-align: center;
  box-shadow: var(--shadow-lg);
}

.settings-content h2 {
  margin-top: 0;
  color: var(--text-primary);
}

.close-settings {
  position: absolute;
  top: 10px;
  right: 15px;
  font-size: 24px;
  cursor: pointer;
  color: var(--text-secondary);
}

.close-settings:hover {
  color: var(--text-primary);
}

.settings-option {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 20px 0;
}

.error-page {
  text-align: center;
  padding: var(--space-xl) 0;
}

.error-header h2 {
  color: var(--danger-color);
  font-size: 2.5rem;
  margin-bottom: var(--space-xl);
}

.error-icon {
  margin: var(--space-lg) 0;
}

.error-icon .material-icons {
  font-size: 5rem;
  color: var(--danger-color);
}

.error-content p {
  font-size: 1.2rem;
  max-width: 600px;
  margin: var(--space-lg) auto;
}

.error-actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  margin: var(--space-xl) 0;
}

.error-actions .btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.error-help {
  font-size: 1rem;
  color: var(--text-secondary);
}