/* TwistedBrain - Base Styles */
/* Clean, minimal, documentation-style design */
/* Light/Dark theme with system preference support */

/* Light theme (default) */
:root {
    /* Colours - Light */
    --color-bg: #ffffff;
    --color-bg-secondary: #f8f9fa;
    --color-text: #1a1a1a;
    --color-text-muted: #666666;
    --color-border: #e5e5e5;
    --color-link: #0066cc;
    --color-link-hover: #004499;
    --color-accent: #0066cc;
    --color-code-bg: #f5f5f5;

    /* Shadows */
    --shadow-dropdown: 0 4px 12px rgba(0, 0, 0, 0.15);

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SF Mono", Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;

    /* Layout */
    --max-width: 1200px;
    --sidebar-width: 280px;
    --content-max-width: 750px;

    /* Theme toggle icon visibility */
    --icon-sun: block;
    --icon-moon: none;
    --icon-system: none;
}

/* Dark theme */
[data-theme="dark"] {
    --color-bg: #0a0a0a;
    --color-bg-secondary: #141414;
    --color-text: #e5e5e5;
    --color-text-muted: #999999;
    --color-border: #2a2a2a;
    --color-link: #6db3f2;
    --color-link-hover: #9dcbf7;
    --color-accent: #6db3f2;
    --color-code-bg: #1a1a1a;

    --shadow-dropdown: 0 4px 16px rgba(0, 0, 0, 0.5);

    --icon-sun: none;
    --icon-moon: block;
    --icon-system: none;
}

/* System theme indicator */
[data-theme="system"] {
    --icon-sun: none;
    --icon-moon: none;
    --icon-system: block;
}

/* System preference: dark */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --color-bg: #0a0a0a;
        --color-bg-secondary: #141414;
        --color-text: #e5e5e5;
        --color-text-muted: #999999;
        --color-border: #2a2a2a;
        --color-link: #6db3f2;
        --color-link-hover: #9dcbf7;
        --color-accent: #6db3f2;
        --color-code-bg: #1a1a1a;
        --shadow-dropdown: 0 4px 16px rgba(0, 0, 0, 0.5);
    }
}

/* Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

/* Base */
html {
    font-size: 16px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg);
    transition: background-color 0.2s ease, color 0.2s ease;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.125rem; }

p {
    margin-bottom: var(--spacing-md);
}

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

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

code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    background: var(--color-code-bg);
    padding: 0.125em 0.375em;
    border-radius: 3px;
}

pre {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    background: var(--color-code-bg);
    padding: var(--spacing-md);
    border-radius: 6px;
    overflow-x: auto;
    margin-bottom: var(--spacing-md);
}

pre code {
    background: none;
    padding: 0;
}

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: color 0.2s ease, background-color 0.2s ease;
}

.theme-toggle:hover {
    color: var(--color-text);
    background: var(--color-code-bg);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
}

.theme-toggle .icon-sun { display: var(--icon-sun); }
.theme-toggle .icon-moon { display: var(--icon-moon); }
.theme-toggle .icon-system { display: var(--icon-system); }

/* Header / Navigation */
.site-header {
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color 0.2s ease, border-color 0.2s ease;
}

.navbar {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
}

.logo:hover {
    text-decoration: none;
}

/* Site title styling (for multi-part titles like [lpmwfx][EU]) */
.brand-suffix {
    color: #00e5ff;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-links a {
    display: flex;
    align-items: center;
    justify-content: center;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--color-text);
}

.nav-icon {
    opacity: 0.7;
    transition: opacity 0.2s ease, filter 0.2s ease;
}

.nav-links a:hover .nav-icon,
.nav-links a.active .nav-icon {
    opacity: 1;
}

/* Theme-based icon colors */
[data-theme="dark"] .nav-icon {
    filter: invert(1);
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .nav-icon {
        filter: invert(1);
    }
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.search-trigger {
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: color 0.2s ease, background-color 0.2s ease;
}

.search-trigger:hover {
    color: var(--color-text);
    background: var(--color-code-bg);
}

.lang-indicator {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    font-weight: 500;
}

/* Layout */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
    display: flex;
    gap: var(--spacing-xxl);
}

.sidebar {
    width: var(--sidebar-width);
    flex-shrink: 0;
}

.content {
    flex: 1;
    max-width: var(--content-max-width);
    min-width: 0;
}

/* TOC Sidebar */
.toc {
    position: sticky;
    top: calc(60px + var(--spacing-xl));
}

.toc-title {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
}

.toc-list,
.toc-sublist {
    list-style: none;
}

.toc-item {
    margin-bottom: var(--spacing-sm);
}

.toc-link {
    display: flex;
    align-items: center;
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.toc-link:hover,
.toc-item.active > .toc-link {
    color: var(--color-text);
}

.toc-sublist {
    margin-left: var(--spacing-md);
    margin-top: var(--spacing-sm);
}

/* Blog Post */
.blog-post .post-header {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.blog-post h1 {
    margin-bottom: var(--spacing-sm);
}

.post-meta {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.post-tags {
    margin-top: var(--spacing-md);
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.tag {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-code-bg);
    border-radius: 4px;
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.tag:hover {
    background: var(--color-border);
    text-decoration: none;
}

.post-content {
    margin-bottom: var(--spacing-xl);
}

/* Article */
.article .article-header {
    margin-bottom: var(--spacing-xl);
}

.article-description {
    font-size: 1.125rem;
    color: var(--color-text-muted);
}

/* Navigation (prev/next) */
.post-navigation,
.article-navigation {
    display: flex;
    justify-content: space-between;
    gap: var(--spacing-lg);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

.prev-post, .next-post,
.prev-article, .next-article {
    display: flex;
    flex-direction: column;
    max-width: 45%;
}

.next-post, .next-article {
    text-align: right;
    margin-left: auto;
}

.nav-label {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.nav-title {
    font-weight: 500;
}

/* Index Pages */
.index-header {
    margin-bottom: var(--spacing-xl);
}

.posts-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.post-card {
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.post-card h2 {
    margin-bottom: var(--spacing-sm);
}

.post-card h2 a {
    color: var(--color-text);
}

.post-excerpt {
    color: var(--color-text-muted);
}

.topic-group {
    margin-bottom: var(--spacing-xl);
}

.topic-title {
    margin-bottom: var(--spacing-md);
}

.topic-description {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
}

.articles-in-topic {
    list-style: none;
}

.articles-in-topic li {
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--color-border);
}

.articles-in-topic p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin: var(--spacing-xs) 0 0;
}

/* Topics grid (articles index) */
.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.topic-card {
    display: block;
    position: relative;
    padding: var(--spacing-lg);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 8px;
    text-decoration: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.topic-card:hover {
    border-color: var(--color-accent);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.topic-card .topic-title {
    margin: 0 0 var(--spacing-sm);
    color: var(--color-text);
    font-size: 1.25rem;
}

.topic-card .topic-count {
    margin: 0;
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

/* Level icons (chapter/section/page) */
.level-icon {
    display: inline-flex;
    align-items: center;
    color: var(--color-text-muted);
    opacity: 0.5;
    margin-right: var(--spacing-xs);
    flex-shrink: 0;
}

.topic-card .level-icon {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    margin-right: 0;
}

.toc-link .level-icon {
    opacity: 0.4;
}

.toc-item.active .level-icon {
    opacity: 0.8;
    color: var(--color-accent);
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

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

/* Recent Posts Sidebar */
.post-meta-sidebar,
.tags-sidebar {
    margin-bottom: var(--spacing-xl);
}

.post-meta-sidebar h3,
.tags-sidebar h3 {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
}

.recent-posts {
    list-style: none;
}

.recent-posts li {
    margin-bottom: var(--spacing-md);
}

.recent-posts a {
    display: block;
    color: var(--color-text);
    font-size: 0.9rem;
}

.recent-posts time {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.tag-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    list-style: none;
}

/* Search Modal */
.search-modal {
    position: fixed;
    inset: 0;
    z-index: 200;
}

.search-modal[hidden] {
    display: none;
}

.search-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
}

.search-container {
    position: absolute;
    top: 15%;
    left: 50%;
    transform: translateX(-50%);
    width: 90%;
    max-width: 600px;
    background: var(--color-bg);
    border-radius: 8px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    overflow: hidden;
}

.search-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.search-header svg {
    color: var(--color-text-muted);
    flex-shrink: 0;
}

#search-input,
#lang-input {
    flex: 1;
    border: none;
    outline: none;
    font-size: 1rem;
    font-family: inherit;
    background: transparent;
    color: var(--color-text);
}

#search-input::placeholder,
#lang-input::placeholder {
    color: var(--color-text-muted);
}

.search-header kbd {
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-code-bg);
    border-radius: 4px;
    font-size: 0.75rem;
    font-family: var(--font-mono);
    color: var(--color-text-muted);
}

.search-results {
    max-height: 400px;
    overflow-y: auto;
    padding: var(--spacing-md) var(--spacing-lg);
}

.search-hint {
    color: var(--color-text-muted);
    text-align: center;
    padding: var(--spacing-lg);
}

.search-group {
    margin-bottom: var(--spacing-lg);
}

.search-group-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-sm);
}

.search-result {
    display: block;
    padding: var(--spacing-sm);
    border-radius: 4px;
    color: var(--color-text);
}

.search-result:hover,
.search-result.active {
    background: var(--color-code-bg);
    text-decoration: none;
}

.search-result-title {
    font-weight: 500;
}

.search-result-excerpt {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

/* Error Page */
.error-page {
    text-align: center;
    padding: var(--spacing-xxl);
}

.error-page h1 {
    font-size: 6rem;
    color: var(--color-text-muted);
}

.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-accent);
    color: white;
    border-radius: 4px;
    margin-top: var(--spacing-lg);
}

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

/* Footer */
.site-footer {
    border-top: 1px solid var(--color-border);
    margin-top: var(--spacing-xxl);
}

.footer-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-lg);
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

.footer-nav {
    display: flex;
    gap: var(--spacing-md);
}

.footer-nav a {
    color: var(--color-text-muted);
}

.footer-icon {
    display: flex;
    align-items: center;
    justify-content: center;
}

.footer-icon svg {
    opacity: 0.7;
    transition: opacity 0.2s ease;
}

.footer-icon:hover svg {
    opacity: 1;
}

.footer-brand {
    width: 100%;
    margin-top: var(--spacing-md);
    text-align: center;
}

.footer-brand img {
    opacity: 0.8;
    transition: opacity 0.2s ease;
}

.footer-brand img:hover {
    opacity: 1;
}

/* DSL Components */

/* Callouts/Admonitions */
.callout {
    padding: var(--spacing-md);
    border-radius: var(--radius);
    margin: var(--spacing-lg) 0;
    border-left: 4px solid;
}

.callout-title {
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.callout-note {
    background: var(--bg-secondary);
    border-color: var(--primary);
}

.callout-tip {
    background: rgba(34, 197, 94, 0.1);
    border-color: #22c55e;
}

.callout-warning {
    background: rgba(234, 179, 8, 0.1);
    border-color: #eab308;
}

.callout-danger {
    background: rgba(239, 68, 68, 0.1);
    border-color: #ef4444;
}

.callout-info {
    background: rgba(59, 130, 246, 0.1);
    border-color: #3b82f6;
}

/* Grid */
.grid {
    margin: var(--spacing-lg) 0;
}

.grid-item {
    padding: var(--spacing-md);
}

/* Cards */
.card {
    display: block;
    background: var(--bg-secondary);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    text-decoration: none;
    color: inherit;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

a.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.card h3 {
    margin: 0 0 var(--spacing-sm) 0;
    color: var(--primary);
}

.card-icon {
    margin-right: var(--spacing-xs);
}

.card-content {
    color: var(--text-secondary);
}

/* Tabs */
.tabs-container {
    margin: var(--spacing-lg) 0;
}

.tab-list {
    display: flex;
    gap: var(--spacing-xs);
    border-bottom: 2px solid var(--border);
    margin-bottom: 0;
}

.tab-button {
    padding: var(--spacing-sm) var(--spacing-md);
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    margin-bottom: -2px;
    cursor: pointer;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.2s, border-color 0.2s;
}

.tab-button:hover {
    color: var(--text);
}

.tab-button.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.tab-panel {
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: 0 0 var(--radius) var(--radius);
}

.tab-panel[hidden] {
    display: none;
}

/* Figures */
figure {
    margin: var(--spacing-lg) 0;
    text-align: center;
}

figure img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius);
}

figcaption {
    margin-top: var(--spacing-sm);
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-style: italic;
}

/* Responsive */
@media (max-width: 900px) {
    .container {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        order: 1;
    }

    .content {
        order: 0;
        max-width: 100%;
    }

    .toc {
        position: static;
    }
}

@media (max-width: 600px) {
    .navbar {
        flex-wrap: wrap;
        gap: var(--spacing-md);
    }

    .nav-links {
        order: 1;
        width: 100%;
        justify-content: center;
    }

    .footer-content {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
}

/* TREF Wrapper - Official AIBlocks Style */
.tref-wrapper {
    border: 1px solid var(--color-border);
    border-radius: 8px;
    padding: 12px;
    background: var(--color-code-bg);
    margin-bottom: var(--spacing-md);
}

.tref-header {
    display: flex;
    align-items: center;
    gap: 8px;
}

.tref-icon {
    display: inline-flex;
    width: 32px;
    height: 32px;
    cursor: grab;
    transition: transform 0.15s;
    flex-shrink: 0;
}

.tref-icon:hover {
    transform: scale(1.1);
}

.tref-icon:active {
    cursor: grabbing;
}

.tref-icon svg {
    width: 100%;
    height: 100%;
}

.tref-id {
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--color-text-muted);
    background: var(--color-border);
    padding: 2px 6px;
    border-radius: 4px;
    transition: all 0.2s;
}

.tref-label {
    font-size: 12px;
    color: var(--color-text-muted);
}

.tref-actions {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: 4px;
    opacity: 0;
    transition: opacity 0.15s;
}

.tref-wrapper:hover .tref-actions {
    opacity: 1;
}

.tref-hint {
    font-size: 11px;
    color: var(--color-text-muted);
    margin-right: 4px;
}

.tref-btn {
    background: transparent;
    border: none;
    padding: 4px;
    cursor: pointer;
    color: var(--color-text-muted);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s;
}

.tref-btn:hover {
    background: var(--color-border);
    color: var(--color-text);
}

.tref-btn svg {
    width: 14px;
    height: 14px;
}

/* Dragging state */
.tref-dragging .tref-icon {
    opacity: 0.7;
}

/* Toast notification */
.tref-toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: #2D1B4E;
    color: white;
    border-radius: 6px;
    font-size: 0.875rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
    opacity: 0;
    transition: transform 0.3s, opacity 0.3s;
    z-index: 1000;
}

.tref-toast-show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* Article footer */
.article-footer {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}