/* Knowledge Base - Minimal Black & White Design */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --kb-font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --kb-font-family: var(--kb-font);
  --kb-bg: #ffffff;
  --kb-text: #1a1a1a;
  --kb-text-muted: #666666;
  --kb-border: #e5e5e5;
  --kb-hover: #f5f5f5;
  --kb-active: #1a1a1a;
  --kb-active-text: #ffffff;
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--kb-font-family);
  line-height: 1.6;
  color: var(--kb-text);
  background-color: var(--kb-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Layout */
.kb-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.kb-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--kb-bg);
  border-bottom: 1px solid var(--kb-border);
}

.kb-header-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.kb-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--kb-text);
  font-weight: 600;
  font-size: 18px;
}

.kb-logo img {
  height: 32px;
  width: auto;
}

.kb-search {
  flex: 1;
  max-width: 400px;
  position: relative;
}

.kb-search-input {
  width: 100%;
  padding: 10px 16px 10px 40px;
  border: 1px solid var(--kb-border);
  border-radius: 8px;
  font-size: 14px;
  color: var(--kb-text);
  background: var(--kb-bg);
  transition: border-color 0.15s;
}

.kb-search-input:focus {
  outline: none;
  border-color: var(--kb-text);
}

.kb-search-input::placeholder {
  color: var(--kb-text-muted);
}

.kb-search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 18px;
  height: 18px;
  color: var(--kb-text-muted);
}

.kb-search-results {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  background: var(--kb-bg);
  border: 1px solid var(--kb-border);
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  max-height: 400px;
  overflow-y: auto;
  display: none;
}

.kb-search-results.active {
  display: block;
}

.kb-search-result {
  display: block;
  padding: 12px 16px;
  text-decoration: none;
  color: var(--kb-text);
  border-bottom: 1px solid var(--kb-border);
  transition: background 0.15s;
}

.kb-search-result:last-child {
  border-bottom: none;
}

.kb-search-result:hover {
  background: var(--kb-hover);
}

.kb-search-result-title {
  font-weight: 500;
  font-size: 14px;
  margin-bottom: 4px;
}

.kb-search-result-desc {
  font-size: 12px;
  color: var(--kb-text-muted);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.kb-menu-btn {
  display: none;
  background: none;
  border: none;
  padding: 8px;
  cursor: pointer;
  color: var(--kb-text);
}

/* Main Layout */
.kb-main {
  flex: 1;
  display: flex;
  max-width: 1400px;
  margin: 0 auto;
  width: 100%;
}

/* Sidebar */
.kb-sidebar {
  width: 280px;
  flex-shrink: 0;
  border-right: 1px solid var(--kb-border);
  padding: 24px;
  height: calc(100vh - 64px);
  position: sticky;
  top: 64px;
  overflow-y: auto;
}

.kb-sidebar-overlay {
  display: none;
}

.kb-category {
  margin-bottom: 8px;
}

.kb-category-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 12px;
  cursor: pointer;
  border-radius: 6px;
  transition: background 0.15s;
  user-select: none;
}

.kb-category-header:hover {
  background: var(--kb-hover);
}

.kb-category-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--kb-text);
}

.kb-category-icon {
  width: 16px;
  height: 16px;
  color: var(--kb-text-muted);
  transition: transform 0.2s;
}

.kb-category.collapsed .kb-category-icon {
  transform: rotate(-90deg);
}

.kb-category-content {
  overflow: hidden;
  transition: max-height 0.25s ease;
  max-height: 2000px;
}

.kb-category.collapsed .kb-category-content {
  max-height: 0;
}

.kb-article-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.kb-article-link {
  display: block;
  padding: 8px 12px 8px 24px;
  font-size: 14px;
  color: var(--kb-text-muted);
  text-decoration: none;
  border-radius: 6px;
  transition: all 0.15s;
}

.kb-article-link:hover {
  background: var(--kb-hover);
  color: var(--kb-text);
}

.kb-article-link.active {
  background: var(--kb-active);
  color: var(--kb-active-text);
  font-weight: 500;
}

/* Content */
.kb-content {
  flex: 1;
  min-width: 0;
  padding: 40px 48px;
  max-width: 800px;
}

.kb-breadcrumb {
  font-size: 12px;
  color: var(--kb-text-muted);
  margin-bottom: 24px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.kb-title {
  font-size: 36px;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 16px;
  color: var(--kb-text);
}

.kb-description {
  font-size: 18px;
  color: var(--kb-text-muted);
  line-height: 1.6;
  margin-bottom: 32px;
}

/* Prose Content */
.kb-prose {
  font-size: 16px;
  line-height: 1.75;
}

.kb-prose h2 {
  font-size: 28px;
  font-weight: 600;
  margin-top: 48px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--kb-border);
  scroll-margin-top: 80px;
}

.kb-prose h3 {
  font-size: 22px;
  font-weight: 600;
  margin-top: 36px;
  margin-bottom: 12px;
  scroll-margin-top: 80px;
}

.kb-prose h4 {
  font-size: 18px;
  font-weight: 600;
  margin-top: 28px;
  margin-bottom: 10px;
  scroll-margin-top: 80px;
}

.kb-prose p {
  margin-bottom: 16px;
}

.kb-prose ul,
.kb-prose ol {
  margin-bottom: 16px;
  padding-left: 28px;
}

.kb-prose li {
  margin-bottom: 8px;
}

.kb-prose strong {
  font-weight: 600;
}

.kb-prose code {
  background: var(--kb-hover);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 14px;
  font-family: 'Monaco', 'Menlo', monospace;
}

.kb-prose pre {
  background: #1a1a1a;
  color: #f5f5f5;
  padding: 20px;
  border-radius: 8px;
  overflow-x: auto;
  margin: 24px 0;
}

.kb-prose pre code {
  background: none;
  padding: 0;
  font-size: 14px;
  color: inherit;
}

.kb-prose img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  margin: 24px 0;
}

.kb-prose a {
  color: var(--kb-text);
  text-decoration: underline;
}

.kb-prose a:hover {
  text-decoration: none;
}

.kb-prose blockquote {
  border-left: 3px solid var(--kb-text);
  padding-left: 16px;
  margin: 24px 0;
  color: var(--kb-text-muted);
  font-style: italic;
}

.kb-prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
}

.kb-prose th,
.kb-prose td {
  border: 1px solid var(--kb-border);
  padding: 10px 14px;
  text-align: left;
}

.kb-prose th {
  background: var(--kb-hover);
  font-weight: 600;
}

/* TOC */
.kb-toc {
  width: 220px;
  flex-shrink: 0;
  padding: 40px 24px;
  position: sticky;
  top: 64px;
  height: calc(100vh - 64px);
  overflow-y: auto;
}

.kb-toc-title {
  font-size: 11px;
  font-weight: 700;
  color: var(--kb-text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 16px;
}

.kb-toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.kb-toc-link {
  display: block;
  padding: 6px 0;
  font-size: 13px;
  color: var(--kb-text-muted);
  text-decoration: none;
  transition: color 0.15s;
}

.kb-toc-link:hover {
  color: var(--kb-text);
}

.kb-toc-link.active {
  color: var(--kb-text);
  font-weight: 500;
}

/* Empty State */
.kb-empty {
  text-align: center;
  padding: 80px 24px;
}

.kb-empty-title {
  font-size: 24px;
  font-weight: 600;
  margin-bottom: 12px;
}

.kb-empty-desc {
  color: var(--kb-text-muted);
}

/* Mobile */
@media (max-width: 1024px) {
  .kb-toc {
    display: none;
  }
  
  .kb-content {
    max-width: none;
    padding: 32px 24px;
  }
}

@media (max-width: 768px) {
  .kb-menu-btn {
    display: block;
  }
  
  .kb-search {
    display: none;
  }
  
  .kb-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 300px;
    height: 100vh;
    z-index: 200;
    background: var(--kb-bg);
    transform: translateX(-100%);
    transition: transform 0.25s ease;
    border-right: 1px solid var(--kb-border);
    padding-top: 64px;
  }
  
  .kb-sidebar.open {
    transform: translateX(0);
  }
  
  .kb-sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.4);
    z-index: 150;
  }
  
  .kb-sidebar-overlay.active {
    display: block;
  }
  
  .kb-title {
    font-size: 28px;
  }
  
  .kb-content {
    padding: 24px 16px;
  }
}

/* Print */
@media print {
  .kb-header,
  .kb-sidebar,
  .kb-toc,
  .kb-menu-btn {
    display: none !important;
  }
  
  .kb-content {
    max-width: none;
    padding: 0;
  }
}

/* Theme Toggle Button */
.kb-theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: 1px solid var(--kb-border);
  border-radius: 8px;
  background: var(--kb-bg);
  cursor: pointer;
  transition: all 0.15s ease;
  flex-shrink: 0;
}

.kb-theme-toggle:hover {
  background: var(--kb-hover);
  border-color: var(--kb-text-muted);
}

.kb-theme-toggle svg {
  width: 20px;
  height: 20px;
  color: var(--kb-text);
}

.kb-theme-toggle .kb-theme-icon-light {
  display: none;
}

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

/* Dark Mode */
.dark {
  --kb-bg: #0a0a0a;
  --kb-text: #fafafa;
  --kb-text-muted: #a1a1a1;
  --kb-border: #262626;
  --kb-hover: #1a1a1a;
  --kb-active: #fafafa;
  --kb-active-text: #0a0a0a;
}

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

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

.dark .kb-search-results {
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

.dark .kb-category-card {
  background: #141414;
  border-color: var(--kb-border);
}

.dark .kb-category-card:hover {
  background: #1a1a1a;
  border-color: #404040;
}

.dark .kb-toc {
  background: #141414;
  border-color: var(--kb-border);
}

.dark .kb-sidebar-overlay {
  background: rgba(0,0,0,0.6);
}

.dark pre,
.dark code {
  background: #1a1a1a;
}

.dark blockquote {
  border-left-color: #404040;
  background: #141414;
}

.dark table th {
  background: #1a1a1a;
}

.dark table td,
.dark table th {
  border-color: var(--kb-border);
}