/* KB Web Viewer - Nexus Knowledge Base - DARK THEME */

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

:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --bg-hover: #30363d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    --border-color: #30363d;
    --accent-blue: #58a6ff;
    --accent-green: #3fb950;
    --accent-purple: #a371f7;
    --accent-orange: #d29922;
    --code-bg: #0d1117;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: var(--accent-blue);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Navigation */
.nav {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 0.75rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-brand a {
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: bold;
}

.nav-brand a:hover {
    color: var(--accent-blue);
    text-decoration: none;
}

.nav-search {
    flex: 1;
    max-width: 400px;
}

.nav-search form {
    display: flex;
}

.nav-search input {
    flex: 1;
    padding: 0.5rem 0.75rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px 0 0 6px;
    font-size: 0.9rem;
    color: var(--text-primary);
}

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

.nav-search input:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.2);
}

.nav-search button {
    padding: 0.5rem 1rem;
    background: var(--accent-blue);
    color: var(--bg-primary);
    border: none;
    border-radius: 0 6px 6px 0;
    cursor: pointer;
    font-weight: 500;
}

.nav-search button:hover {
    background: #79b8ff;
}

.nav-user {
    margin-left: auto;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Main Content */
.main {
    flex: 1;
    padding: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 1rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* KB List (Home) */
.kb-list h1 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.kb-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
}

.kb-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.25rem;
    display: flex;
    gap: 1rem;
    transition: border-color 0.2s, transform 0.2s;
    color: inherit;
}

.kb-card:hover {
    border-color: var(--accent-blue);
    transform: translateY(-2px);
    text-decoration: none;
}

.kb-card-icon {
    font-size: 2rem;
}

.kb-card-content h2 {
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.kb-card-content p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.kb-card-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Tree View */
.tree-view {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
}

.tree-header {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.tree-header h1 {
    margin: 0.5rem 0;
    color: var(--text-primary);
}

.back-link {
    font-size: 0.9rem;
    color: var(--accent-blue);
}

.kb-description {
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

/* Tree Structure */
.tree {
    list-style: none;
}

.tree ul {
    list-style: none;
    padding-left: 1.5rem;
}

.tree li {
    margin: 0.25rem 0;
}

.tree .caret {
    cursor: pointer;
    user-select: none;
    display: inline-block;
    padding: 0.25rem 0;
    color: var(--text-primary);
}

.tree .caret::before {
    content: '\25B6';
    color: var(--text-muted);
    display: inline-block;
    margin-right: 0.5rem;
    transition: transform 0.2s;
    font-size: 0.7rem;
}

.tree .caret-down::before {
    transform: rotate(90deg);
}

.tree .caret:hover {
    color: var(--accent-blue);
}

.tree .nested {
    display: none;
}

.tree .nested.active {
    display: block;
}

.tree .tree-leaf {
    display: inline-block;
    padding: 0.25rem 0;
    color: var(--text-primary);
}

.tree .tree-leaf:hover {
    color: var(--accent-blue);
}

.tree .tree-link {
    color: var(--text-primary);
}

.tree .tree-link:hover {
    color: var(--accent-blue);
}

.tree .has-content {
    color: var(--accent-green);
    margin-left: 0.25rem;
}

/* Node View */
.node-view {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
}

/* Breadcrumb */
.breadcrumb {
    font-size: 0.9rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.breadcrumb a {
    color: var(--accent-blue);
}

.breadcrumb .sep {
    margin: 0 0.5rem;
    color: var(--text-muted);
}

.breadcrumb .current {
    color: var(--text-primary);
    font-weight: 500;
}

/* Node Header */
.node-header {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.node-type-badge {
    display: inline-block;
    background: var(--accent-purple);
    color: var(--bg-primary);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    text-transform: uppercase;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.node-header h1 {
    font-size: 1.75rem;
    margin: 0.25rem 0;
    color: var(--text-primary);
}

.node-description {
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

.node-tags {
    margin-top: 0.75rem;
}

.tag {
    display: inline-block;
    background: var(--bg-tertiary);
    color: var(--accent-blue);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-size: 0.8rem;
    margin-right: 0.5rem;
    border: 1px solid var(--border-color);
}

/* Node Content (Markdown) */
.node-content {
    line-height: 1.7;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.node-content h1, .node-content h2, .node-content h3,
.node-content h4, .node-content h5, .node-content h6 {
    margin: 1.5rem 0 0.75rem;
    color: var(--text-primary);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5rem;
}

.node-content h1 { font-size: 1.5rem; }
.node-content h2 { font-size: 1.3rem; }
.node-content h3 { font-size: 1.15rem; }

.node-content p {
    margin: 0.75rem 0;
}

.node-content ul, .node-content ol {
    margin: 0.75rem 0;
    padding-left: 2rem;
}

.node-content li {
    margin: 0.25rem 0;
}

.node-content code {
    background: var(--bg-tertiary);
    padding: 0.15rem 0.4rem;
    border-radius: 3px;
    font-family: 'Fira Code', 'Consolas', monospace;
    font-size: 0.9em;
    color: var(--accent-orange);
}

.node-content pre {
    background: var(--code-bg);
    border: 1px solid var(--border-color);
    padding: 1rem;
    border-radius: 6px;
    overflow-x: auto;
    margin: 1rem 0;
}

.node-content pre code {
    background: none;
    padding: 0;
    color: var(--text-primary);
}

.node-content blockquote {
    border-left: 4px solid var(--accent-blue);
    padding-left: 1rem;
    color: var(--text-secondary);
    margin: 1rem 0;
    background: var(--bg-tertiary);
    padding: 0.75rem 1rem;
    border-radius: 0 6px 6px 0;
}

.node-content table {
    border-collapse: collapse;
    width: 100%;
    margin: 1rem 0;
}

.node-content th, .node-content td {
    border: 1px solid var(--border-color);
    padding: 0.5rem 0.75rem;
    text-align: left;
}

.node-content th {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.node-content a {
    color: var(--accent-blue);
}

/* Children List */
.node-children {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.node-children h2 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.children-list {
    list-style: none;
}

.children-list li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.children-list li:last-child {
    border-bottom: none;
}

.children-list a {
    color: var(--text-primary);
}

.children-list a:hover {
    color: var(--accent-blue);
}

.child-desc {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Node Meta */
.node-meta {
    margin-top: 1.5rem;
    padding: 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.node-meta strong {
    color: var(--text-primary);
}

.node-nav {
    margin-top: 1.5rem;
}

.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--accent-blue);
    color: var(--bg-primary);
    border-radius: 6px;
    font-weight: 500;
}

.btn:hover {
    background: #79b8ff;
    text-decoration: none;
}

/* Search */
.search-view h1 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.search-form {
    display: flex;
    margin-bottom: 1.5rem;
}

.search-form input {
    flex: 1;
    padding: 0.75rem 1rem;
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: 6px 0 0 6px;
    font-size: 1rem;
    color: var(--text-primary);
}

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

.search-form input:focus {
    outline: none;
    border-color: var(--accent-blue);
}

.search-form button {
    padding: 0.75rem 1.5rem;
    background: var(--accent-blue);
    color: var(--bg-primary);
    border: none;
    border-radius: 0 6px 6px 0;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
}

.search-form button:hover {
    background: #79b8ff;
}

.results-count {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.results-list {
    list-style: none;
}

.result-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 1rem;
    margin-bottom: 0.75rem;
    border-radius: 6px;
}

.result-item:hover {
    border-color: var(--accent-blue);
}

.result-title {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--accent-blue);
}

.result-path {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin: 0.25rem 0;
}

.result-snippet {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
}

.empty-state .muted {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

/* Error */
.error-view {
    text-align: center;
    padding: 3rem;
    color: var(--text-primary);
}

.error-view h1 {
    margin-bottom: 1rem;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
    .nav {
        flex-wrap: wrap;
        gap: 0.75rem;
    }
    
    .nav-search {
        order: 3;
        width: 100%;
        max-width: none;
    }
    
    .main {
        padding: 1rem;
    }
    
    .kb-grid {
        grid-template-columns: 1fr;
    }
}