.search-result-header {
    display: flex;
    flex-direction: column;
    gap: 0.1em;
}

.search-result-anchor {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    margin-bottom: 0.1em;
    font-family: var(--font-mono, monospace);
    opacity: 0.7;
    letter-spacing: 0.01em;
}

.search-container {
    width: auto;
    max-width: 400px;
    position: relative;
}

@media (max-width: 640px) {
    .search-container {
        width: 100%;
        max-width: none;
    }
}

.search-results-panel {

    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    max-height: 60vh;
    overflow-y: auto;
    margin-top: 4px;
    background: var(--color-background-primary);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
    z-index: 100;
    padding: 0.5rem 0;
    display: flex;
    flex-direction: column;
    gap: 0;
    scrollbar-width: thin;
    scrollbar-color: transparent transparent;
    transition: scrollbar-color 0.3s ease 0.5s;
}

.search-results-panel:hover {
    scrollbar-color: var(--color-scrollbar-thumb) transparent;
    transition: scrollbar-color 0.15s ease;
}

.search-results-panel::-webkit-scrollbar {
    width: 6px;
    background: transparent;
}

.search-results-panel:hover::-webkit-scrollbar-thumb {
    background: var(--color-scrollbar-thumb);
    border-radius: 8px;
}

.search-results-panel::-webkit-scrollbar-thumb {
    background: transparent;
    border-radius: 8px;
}

.search-result-item {
    display: block;
    padding: 0.5rem 1rem;
    color: var(--color-text-primary);
    text-decoration: none;
    border: none;
    background: none;
    cursor: pointer;
    border-radius: 0;
    transition: background 0.15s;
}

.search-result-item:hover,
.search-result-item:focus {
    background: var(--color-background-secondary);
}

.search-result-title {
    font-size: var(--font-size-sm);
    margin: 0;
    font-weight: 500;
}

.search-result-snippet {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    margin: 0.25rem 0 0 0;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 100%;
    white-space: normal;
}

:root {
    /* Gray scale */
    --color-white: hsl(0deg 0% 100%);
    --color-black: hsl(0deg 0% 0%);
    --color-gray-05: hsl(212deg 10% 10%);
    --color-gray-10: hsl(212deg 8% 15%);
    --color-gray-15: hsl(212deg 8% 18%);
    --color-gray-20: hsl(212deg 7% 22%);
    --color-gray-30: hsl(212deg 6% 32%);
    --color-gray-40: hsl(212deg 5% 45%);
    --color-gray-50: hsl(212deg 5% 55%);
    --color-gray-60: hsl(212deg 5% 65%);
    --color-gray-70: hsl(212deg 5% 75%);
    --color-gray-80: hsl(212deg 7% 93.5%);
    --color-gray-90: hsl(212deg 7% 97%);

    /* Blue scale */
    --color-blue-05: hsl(217deg 100% 12%);
    --color-blue-10: hsl(217deg 100% 18%);
    --color-blue-20: hsl(217deg 100% 32%);
    --color-blue-30: hsl(217deg 100% 42%);
    --color-blue-40: hsl(217deg 100% 50%);
    --color-blue-50: hsl(217deg 100% 60%);
    --color-blue-60: hsl(217deg 100% 70%);
    --color-blue-70: hsl(217deg 100% 78%);
    --color-blue-80: hsl(217deg 91% 85%);

    /* Yellow scale */
    --color-yellow-10: hsl(43deg 100% 18%);
    --color-yellow-20: hsl(43deg 100% 30%);
    --color-yellow-50: hsl(43deg 100% 50%);
    --color-yellow-80: hsl(43deg 100% 85%);

    /* Semantic colors - Dark theme */
    --color-background-page: var(--color-gray-05);
    --color-background-primary: var(--color-gray-10);
    --color-background-secondary: var(--color-gray-15);
    --color-background-tertiary: var(--color-gray-20);
    --color-background-code: hsl(212deg 12% 8%);
    --color-background-blue: hsl(217deg 50% 15%);
    --color-background-yellow: hsl(43deg 50% 15%);

    --color-text-primary: var(--color-white);
    --color-text-secondary: var(--color-gray-60);
    --color-text-tertiary: var(--color-gray-50);
    --color-text-link: var(--color-blue-70);
    --color-text-link-hover: var(--color-blue-80);

    --color-border-primary: var(--color-gray-20);
    --color-border-secondary: var(--color-gray-30);

    /* Code */
    --color-text-code: var(--color-gray-80);

    /* Tags */
    --color-tag-text: var(--color-blue-70);
    --color-tag-border: var(--color-blue-20);

    /* Scrollbar */
    --color-scrollbar-thumb: var(--color-gray-30);
    --color-scrollbar-thumb-hover: var(--color-gray-40);

    /* Typography */
    --font-family-base: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-family-code: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;

    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    --line-height-tight: 1.2;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.7;

    /* Layout */
    --layout-sidebar-width: 15rem;
    --layout-toc-width: 12rem;
    --layout-content-max: 50rem;
    --layout-gap: 2rem;
    --layout-side-padding: 1.5rem;
    --sticky-header-height: 3.5rem;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;

    /* Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
}

/* ==========================================================================
   Light Theme
   ========================================================================== */

@media (prefers-color-scheme: light) {
    :root {
        /* Semantic colors - Light theme */
        --color-background-page: var(--color-gray-90);
        --color-background-primary: var(--color-white);
        --color-background-secondary: hsl(212deg 7% 96%);
        --color-background-tertiary: hsl(212deg 7% 92%);
        --color-background-code: hsl(212deg 10% 96%);
        --color-background-blue: hsl(217deg 80% 95%);
        --color-background-yellow: hsl(43deg 80% 95%);

        --color-text-primary: var(--color-gray-05);
        --color-text-secondary: var(--color-gray-30);
        --color-text-tertiary: var(--color-gray-40);
        --color-text-link: var(--color-blue-30);
        --color-text-link-hover: var(--color-blue-20);

        --color-border-primary: hsl(212deg 7% 85%);
        --color-border-secondary: var(--color-gray-60);

        /* Code */
        --color-text-code: var(--color-gray-20);

        /* Tags - darker blue for better contrast */
        --color-tag-text: var(--color-blue-20);
        --color-tag-border: hsl(217deg 60% 60%);

        /* Scrollbar - lighter for light mode */
        --color-scrollbar-thumb: var(--color-gray-70);
        --color-scrollbar-thumb-hover: var(--color-gray-60);
    }
}

/* ==========================================================================
   Reset & Base
   ========================================================================== */

*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
    color: var(--color-text-primary);
    background: var(--color-background-page);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--color-text-link);
    text-decoration: underline;
    text-underline-offset: 2px;
}

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

/* Hide grain for cleaner CODE-SHELL look */
.grain {
    display: none;
}

/* ==========================================================================
   Navigation / Header
   ========================================================================== */

.shell {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.header {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--sticky-header-height);
    padding: 0 var(--layout-side-padding);
    background: var(--color-background-primary);
    border-bottom: 1px solid var(--color-border-primary);
}

.logo-group {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    text-decoration: none;
    color: var(--color-text-primary);
}

.logo {
    /* Will be inverted in light mode */
}

@media (prefers-color-scheme: light) {
    .logo {
        filter: invert(1);
    }
}

.logo-text {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    letter-spacing: -0.01em;
    margin-left: -18px;
}

.badge {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    padding: var(--space-1) var(--space-2);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--radius-sm);
}

/* Search Bar */
.search-bar {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: 6px var(--space-3);
    background: var(--color-background-primary);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--radius-md);
    cursor: text;
    min-width: 320px;
    transition: border-color 0.15s, background-color 0.15s;
}

.search-bar:hover {
    border-color: var(--color-border-secondary);
    background: var(--color-background-secondary);
}

.search-bar:focus-within {
    border-color: var(--color-blue-50);
    background: var(--color-background-secondary);
}

.search-icon {
    width: 16px;
    height: 16px;
    color: var(--color-text-secondary);
    flex-shrink: 0;
}

.search-input {
    flex: 1;
    border: none;
    background: transparent;
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    font-family: inherit;
    outline: none;
    min-width: 0;
}

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

.search-shortcut {
    font-family: var(--font-sans);
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    background: var(--color-background-primary);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--radius-sm);
    padding: 2px 6px;
    line-height: 1;
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.nav a {
    color: var(--color-text-secondary);
    text-decoration: none;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    transition: color 0.15s, background-color 0.15s;
}

.nav a:hover {
    color: var(--color-text-primary);
    background: var(--color-background-secondary);
}

/* ==========================================================================
   Page Layout (3-column)
   ========================================================================== */

.page {
    flex: 1;
    width: 100%;
    max-width: calc(var(--layout-sidebar-width) + var(--layout-content-max) + var(--layout-toc-width) + var(--layout-gap) * 2 + var(--layout-side-padding) * 2);
    margin: 0 auto;
    padding: 0 var(--layout-side-padding);
}

.layout {
    display: grid;
    grid-template-columns: var(--layout-sidebar-width) minmax(0, var(--layout-content-max)) var(--layout-toc-width);
    gap: var(--layout-gap);
    align-items: start;
    padding: var(--space-8) 0;
}

/* ==========================================================================
   Left Sidebar
   ========================================================================== */

.scrollable-sidebar {
    position: sticky;
    top: calc(var(--sticky-header-height) + var(--space-8));
    max-height: calc(100vh - var(--sticky-header-height) - var(--space-8));
    overflow-y: auto;
    align-self: start;

    /* Natural Safari-like scrollbar - hidden until hover */
    scrollbar-width: thin;
    scrollbar-color: transparent transparent;
    transition: scrollbar-color 0.3s ease 0.5s;
}

.scrollable-sidebar:hover {
    scrollbar-color: var(--color-scrollbar-thumb) transparent;
    transition: scrollbar-color 0.15s ease;
}

.scrollable-sidebar::-webkit-scrollbar {
    width: 6px;
}

.scrollable-sidebar::-webkit-scrollbar-track {
    background: transparent;
}

.scrollable-sidebar::-webkit-scrollbar-thumb {
    background-color: transparent;
    border-radius: 3px;
    transition: background-color 0.3s ease 0.5s;
}

.scrollable-sidebar:hover::-webkit-scrollbar-thumb {
    background-color: var(--color-scrollbar-thumb);
    transition: background-color 0.15s ease;
}

.scrollable-sidebar:hover::-webkit-scrollbar-thumb:hover {
    background-color: var(--color-scrollbar-thumb-hover);
}

.sidebar {
    padding-right: var(--space-4);
}

.sidebar-label {
    margin: 0 0 var(--space-2);
    color: var(--color-text-secondary);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.sidebar-label a {
    color: var(--color-text-secondary);
    text-decoration: none;
}

.sidebar-title {
    margin: 0 0 var(--space-4);
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
}

.sidebar-nav a {
    display: block;
    padding: var(--space-2) var(--space-3);
    margin-left: 2px;
    color: var(--color-text-primary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    border-left: 2px solid var(--color-border-primary);
    transition: color 0.15s, border-color 0.15s, background-color 0.15s;
}

.sidebar-nav a:hover {
    color: var(--color-text-link);
    border-left-color: var(--color-blue-50);
    background: var(--color-background-blue);
}

.sidebar-nav a.active {
    color: var(--color-text-link);
    border-left-color: var(--color-blue-50);
    background: var(--color-background-blue);
    font-weight: var(--font-weight-medium);
}

.sidebar-group {
    margin-bottom: var(--space-4);
}

.sidebar-group-title {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin: var(--space-3) 0 var(--space-2) var(--space-3);
}

.sidebar-divider {
    height: 1px;
    margin: var(--space-3) 0;
    background: var(--color-border-primary);
}

/* ==========================================================================
   Main Article Content
   ========================================================================== */

.article {
    min-width: 0;
}

.breadcrumb {
    margin-bottom: var(--space-4);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    display: flex;
    align-items: center;
    gap: 0.25em;
}

.breadcrumb a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color 0.15s, border-color 0.15s;
    font-weight: 500;
}

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

/* ==========================================================================
   Hero
   ========================================================================== */

.hero {
    margin-bottom: var(--space-8);
}

.hero-content h1 {
    margin: 0 0 var(--space-4);
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-normal);
    line-height: var(--line-height-tight);
    color: var(--color-text-primary);
}

.hero-content .lead {
    margin: 0 0 var(--space-4);
    font-size: var(--font-size-base);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
}

.eyebrow {
    margin: 0 0 var(--space-2);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-text-secondary);
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-top: var(--space-4);
}

.tag {
    display: inline-flex;
    align-items: center;
    padding: var(--space-1) var(--space-3);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    color: var(--color-tag-text);
    background: var(--color-background-blue);
    border: 1px solid var(--color-tag-border);
    border-radius: 9999px;
}

/* ==========================================================================
   Cards
   ========================================================================== */

.hero-meta {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--space-3);
    margin-top: var(--space-6);
    padding-top: var(--space-6);
    border-top: 1px solid var(--color-border-primary);
}

.card {
    padding: var(--space-3) var(--space-4);
    background: var(--color-background-secondary);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--radius-md);
}

.card-label {
    margin: 0 0 var(--space-1);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-secondary);
}

.card p,
.card a {
    margin: 0;
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
}

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

.card-stage {
    border-left: 3px solid var(--color-blue-50);
}

.card-availability {
    border-left: 3px solid var(--color-blue-50);
}

.card-spec {
    border-left: 3px solid var(--color-blue-50);
}

/* ==========================================================================
   Card Grid (Summary Cards)
   ========================================================================== */

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--space-4);
    margin: var(--space-8) 0;
}

.card-grid .card {
    padding: var(--space-4);
}

.card-grid .card .card-title {
    margin: 0 0 var(--space-2);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
}

.card-grid .card p {
    margin: 0;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
}

/* ==========================================================================
   Content Sections
   ========================================================================== */

.section {
    margin-top: var(--space-10);
    scroll-margin-top: calc(var(--sticky-header-height) + var(--space-4));
}

.section-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-4);
    margin-bottom: var(--space-4);
}

.section-header h2 {
    margin: 0;
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    line-height: var(--line-height-tight);
}

.anchor-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: var(--font-size-lg);
    opacity: 0;
    transition: opacity 0.15s;
}

.section-header:hover .anchor-link {
    opacity: 1;
}

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


.section>div>p {
    margin: var(--space-4) 0;
    color: var(--color-text-primary);
    line-height: var(--line-height-relaxed);
}

/* ==========================================================================
   Inline Elements
   ========================================================================== */

.note {
    margin: var(--space-4) 0;
    padding: var(--space-3) var(--space-4);
    background: var(--color-background-yellow);
    border-left: 3px solid var(--color-yellow-50);
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
}

.list {
    margin: var(--space-4) 0;
    padding-left: var(--space-6);
    color: var(--color-text-primary);
}

.list li {
    margin-bottom: var(--space-2);
    line-height: var(--line-height-relaxed);
}

.list li::marker {
    color: var(--color-text-secondary);
}

/* ==========================================================================
   Code Blocks
   ========================================================================== */

.code-figure {
    margin: var(--space-4) 0;
    background: var(--color-background-code);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.code-figure figcaption {
    margin: 0;
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    background: var(--color-background-tertiary);
    border-bottom: 1px solid var(--color-border-primary);
}

.code,
pre.code {
    margin: 0;
    padding: var(--space-4);
    font-family: var(--font-family-code);
    font-size: var(--font-size-sm);
    line-height: var(--line-height-normal);
    color: var(--color-text-code);
    background: var(--color-background-code);
    white-space: pre;
    overflow-x: auto;
    tab-size: 2;
}

code {
    font-family: var(--font-family-code);
    font-size: 0.9em;
    padding: 0.1em 0.3em;
    background: var(--color-background-tertiary);
    border-radius: var(--radius-sm);
}

pre code {
    padding: 0;
    background: none;
    border-radius: 0;
}

/* ==========================================================================
   Definition Lists
   ========================================================================== */

.dl {
    margin: var(--space-4) 0;
    padding: 0;
}

.dl>div {
    display: grid;
    grid-template-columns: 14rem 1fr;
    gap: var(--space-2) var(--space-4);
    padding: var(--space-2) 0;
    border-bottom: 1px solid var(--color-border-primary);
}

.dl>div:last-child {
    border-bottom: none;
}

.dl dt {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    min-width: 0;
}

.dl dt a {
    color: inherit;
    text-decoration: none;
}

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

.hero-value {
    margin: var(--space-4) 0;
}

.value-link {
    text-decoration: none;
    display: block;
}

.value-link:hover .code {
    border-color: var(--color-text-link);
}

.dl dd {
    margin: 0;
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
}

/* ==========================================================================
   Examples Section
   ========================================================================== */

.examples {
    display: grid;
    gap: var(--space-6);
}

.example {
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--color-border-primary);
}

.example-header {
    padding: var(--space-1) var(--space-3);
    background: var(--color-background-tertiary);
    border-bottom: 1px solid var(--color-border-primary);
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.example-title {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
}

.example-desc {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
}

.example .code {
    margin: 0;
    padding: var(--space-4);
    background: var(--color-background-code);
    border: none;
    border-radius: 0;
}

.example-footer {
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
}

.example-output-label {
    color: var(--color-gray-60);
    margin-right: var(--space-1);
}

.callout {
    margin-top: var(--space-3);
    padding: var(--space-3);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    background: var(--color-background-tertiary);
    border-radius: var(--radius-sm);
}

/* ==========================================================================
   See Also / Link Lists
   ========================================================================== */

.links {
    list-style: none;
    margin: var(--space-4) 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.links li {
    font-size: var(--font-size-sm);
}

.links a {
    color: var(--color-text-link);
}

.links a:hover {
    color: var(--color-text-link-hover);
}

/* ==========================================================================
   Right TOC Panel (On this page)
   ========================================================================== */

.toc {
    padding-left: var(--space-4);
}

.toc-content {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.toc-title {
    margin: 0;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-secondary);
}

.toc nav {
    display: flex;
    flex-direction: column;
}

.toc nav a {
    display: block;
    padding: var(--space-2) var(--space-3);
    margin-left: 2px;
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    text-decoration: none;
    border-left: 2px solid var(--color-border-primary);
    transition: color 0.15s, border-color 0.15s;
}

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

.toc-cta {
    margin-top: var(--space-4);
    padding: var(--space-3);
    background: var(--color-background-secondary);
    border: 1px solid var(--color-border-primary);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
}

.toc-cta p {
    margin: 0 0 var(--space-2);
    color: var(--color-text-secondary);
}

/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
    margin-top: auto;
    padding: var(--space-4) var(--layout-side-padding);
    background: var(--color-background-secondary);
    border-top: 1px solid var(--color-border-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
}

.footer a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: color 0.15s;
}

.footer a:hover {
    color: var(--color-text-link);
}

.footer-links {
    display: flex;
    gap: var(--space-1);
}

.footer-links::before {
    content: "·";
    color: var(--color-text-secondary);
}

.footer-links a {
    padding: 0 var(--space-1);
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 1200px) {
    .layout {
        grid-template-columns: var(--layout-sidebar-width) minmax(0, 1fr);
    }

    .toc {
        display: none;
    }
}

@media (max-width: 900px) {
    .layout {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: relative;
        top: 0;
        max-height: none;
        padding: var(--space-4);
        margin-bottom: var(--space-4);
        background: var(--color-background-secondary);
        border: 1px solid var(--color-border-primary);
        border-radius: var(--radius-md);
    }

    .hero-meta {
        grid-template-columns: 1fr;
    }

    .card-grid {
        grid-template-columns: 1fr;
    }

    .dl>div {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    :root {
        --layout-side-padding: 1rem;
    }

    .header {
        flex-wrap: wrap;
        gap: var(--space-2);
        height: auto;
        padding: var(--space-3) var(--layout-side-padding);
    }

    .search-bar {
        order: 3;
        width: 100%;
        min-width: unset;
    }

    .nav {
        width: 100%;
        justify-content: flex-start;
        flex-wrap: wrap;
    }

    .hero-content h1 {
        font-size: var(--font-size-2xl);
    }
}