/* ============================================================
   ghost-geo-theme-2026 — screen.css
   Zero Bloat: Native CSS3 + Custom Properties + Vanilla JS
   ============================================================ */

/* ------------------------------------------------------------
   CSS Custom Properties
   ------------------------------------------------------------ */
:root {
  --gh-font-heading: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif;
  --gh-font-body: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif;

  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-primary-light: #dbeafe;
  --color-text: #1e293b;
  --color-text-secondary: #64748b;
  --color-text-tertiary: #94a3b8;
  --color-background: #ffffff;
  --color-surface: #f8fafc;
  --color-surface-hover: #f1f5f9;
  --color-border: #e2e8f0;
  --color-border-light: #f1f5f9;
  --color-code-bg: #0f172a;
  --color-code-text: #e2e8f0;
  --color-blockquote-border: #2563eb;
  --color-blockquote-bg: #f0f7ff;
  --color-success: #16a34a;
  --color-warning: #f59e0b;
  --color-error: #dc2626;

  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Fira Mono', 'Roboto Mono', 'Cascadia Code', Consolas, monospace;
  --font-serif: Georgia, 'Times New Roman', serif;

  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.05);

  --container-max: 1200px;
  --content-max: 780px;
  --header-height: 64px;

  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

/* ------------------------------------------------------------
   Dark Theme
   ------------------------------------------------------------ */
[data-theme="dark"] {
  --color-primary: #3b82f6;
  --color-primary-hover: #60a5fa;
  --color-primary-light: #1e3a5f;
  --color-text: #e2e8f0;
  --color-text-secondary: #94a3b8;
  --color-text-tertiary: #64748b;
  --color-background: #0f172a;
  --color-surface: #1e293b;
  --color-surface-hover: #334155;
  --color-border: #334155;
  --color-border-light: #1e293b;
  --color-code-bg: #020617;
  --color-code-text: #cbd5e1;
  --color-blockquote-border: #3b82f6;
  --color-blockquote-bg: #172554;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.4), 0 2px 4px -2px rgba(0,0,0,0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.5), 0 4px 6px -4px rgba(0,0,0,0.3);
}

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

html {
  font-size: 100%;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--gh-font-body, var(--font-sans));
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

img, svg, video, canvas { display: block; max-width: 100%; height: auto; }
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--color-primary-hover); text-decoration: underline; }
button { cursor: pointer; font-family: inherit; font-size: inherit; }
ul, ol { padding-left: 1.5rem; }
:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 2px; }
::selection { background: var(--color-primary); color: #fff; }

/* ------------------------------------------------------------
   Fluid Typography (clamp-based)
   ------------------------------------------------------------ */
h1, .h1 { font-family: var(--gh-font-heading, var(--font-sans)); font-size: clamp(1.75rem, 4vw, 2.5rem); line-height: 1.2; font-weight: 800; letter-spacing: -0.02em; }
h2, .h2 { font-family: var(--gh-font-heading, var(--font-sans)); font-size: clamp(1.35rem, 3vw, 1.875rem); line-height: 1.3; font-weight: 700; letter-spacing: -0.01em; margin-top: var(--spacing-2xl); margin-bottom: var(--spacing-md); }
h3, .h3 { font-family: var(--gh-font-heading, var(--font-sans)); font-size: clamp(1.15rem, 2.5vw, 1.5rem); line-height: 1.35; font-weight: 600; margin-top: var(--spacing-xl); margin-bottom: var(--spacing-sm); }
h4 { font-family: var(--gh-font-heading, var(--font-sans)); font-size: clamp(1rem, 2vw, 1.25rem); line-height: 1.4; font-weight: 600; }
p { font-size: clamp(1rem, 2vw, 1.125rem); margin-bottom: var(--spacing-lg); }

/* ------------------------------------------------------------
   Layout: Site Wrapper
   ------------------------------------------------------------ */
.site-wrapper {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
.site-main {
  flex: 1;
  padding-top: calc(var(--header-height) + var(--spacing-xl));
}

/* ------------------------------------------------------------
   Header
   ------------------------------------------------------------ */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--header-height);
  background-color: var(--color-background);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.header-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-lg);
}

.site-logo { display: flex; align-items: center; flex-shrink: 0; }
.site-logo img { height: 32px; width: auto; }
.site-title { font-size: 1.25rem; font-weight: 700; color: var(--color-text); white-space: nowrap; }

.site-nav { display: flex; align-items: center; }
.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; padding: 4px; }
.nav-toggle-bar { display: block; width: 24px; height: 2px; background: var(--color-text); border-radius: 1px; transition: transform var(--transition-base), opacity var(--transition-base); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
.nav-menu { display: flex; list-style: none; gap: var(--spacing-xs); padding-left: 0; align-items: center; flex-wrap: wrap; }
.nav-item a {
  display: block; padding: var(--spacing-xs) var(--spacing-sm);
  color: var(--color-text-secondary); font-weight: 500; font-size: 0.9375rem;
  border-radius: var(--radius-sm); transition: background var(--transition-fast), color var(--transition-fast);
}
.nav-item a:hover, .nav-item.nav-current a { color: var(--color-primary); background: var(--color-primary-light); text-decoration: none; }

.theme-toggle { background: none; border: 1px solid var(--color-border); border-radius: var(--radius-md); width: 36px; height: 36px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; transition: border-color var(--transition-fast); }
.theme-toggle:hover { border-color: var(--color-primary); }
.theme-toggle-icon {
  display: block; width: 18px; height: 18px; border-radius: 50%;
  background: var(--color-text); box-shadow: inset 0 0 0 1px var(--color-background);
  position: relative;
}
[data-theme="dark"] .theme-toggle-icon { background: #fbbf24; box-shadow: none; }

/* ------------------------------------------------------------
   Post Feed Grid
   ------------------------------------------------------------ */
.post-feed { padding: var(--spacing-2xl) var(--spacing-lg); }
.feed-inner { max-width: var(--container-max); margin: 0 auto; }
.feed-header { text-align: center; margin-bottom: var(--spacing-3xl); }
.feed-title { margin-bottom: var(--spacing-sm); }
.feed-description { color: var(--color-text-secondary); font-size: 1.125rem; max-width: 600px; margin: 0 auto; }

.post-feed-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--spacing-xl);
}

/* ------------------------------------------------------------
   Post Card
   ------------------------------------------------------------ */
.post-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}
.post-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.post-card-link { display: block; color: inherit; }
.post-card-link:hover { color: inherit; text-decoration: none; }
.post-card-image { position: relative; overflow: hidden; aspect-ratio: 16 / 9; background: var(--color-border-light); }
.post-card-img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--transition-base); }
.post-card:hover .post-card-img { transform: scale(1.03); }
.post-card-content { padding: var(--spacing-lg); }
.post-card-tag {
  display: inline-block; font-size: 0.75rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: 0.05em; color: var(--color-primary); margin-bottom: var(--spacing-sm);
}
.post-card-title { font-size: clamp(1.1rem, 2.2vw, 1.3rem); line-height: 1.3; font-weight: 700; margin-bottom: var(--spacing-sm); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.post-card-excerpt { font-size: 0.9375rem; color: var(--color-text-secondary); margin-bottom: var(--spacing-md); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.post-card-meta { display: flex; gap: var(--spacing-md); font-size: 0.8125rem; color: var(--color-text-tertiary); }

/* ------------------------------------------------------------
   Article Layout (Desktop: content + sidebar ToC)
   ------------------------------------------------------------ */
.article-layout {
  max-width: var(--container-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
  padding: 0 var(--spacing-lg);
}
@media (min-width: 1100px) {
  .article-layout {
    grid-template-columns: 220px 1fr;
  }
}
.article-body {
  max-width: var(--content-max);
  width: 100%;
  margin: 0 auto;
  padding-bottom: var(--spacing-3xl);
}

/* Sidebar ToC */
.article-sidebar { display: none; }
@media (min-width: 1100px) {
  .article-sidebar { display: block; }
}
.toc-nav {
  position: sticky; top: calc(var(--header-height) + var(--spacing-xl));
  padding: var(--spacing-lg) 0;
}
.toc-title { font-size: 0.8125rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.05em; color: var(--color-text-tertiary); margin-bottom: var(--spacing-md); }
.toc-list { list-style: none; padding-left: 0; border-left: 1px solid var(--color-border); }
.toc-item a {
  display: block; padding: var(--spacing-xs) var(--spacing-md); font-size: 0.875rem;
  color: var(--color-text-secondary); border-left: 2px solid transparent; margin-left: -1px;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}
.toc-item a:hover, .toc-item a.toc-active { color: var(--color-primary); border-left-color: var(--color-primary); text-decoration: none; }
.toc-sublist { list-style: none; padding-left: var(--spacing-md); }
.toc-item-h3 a { font-size: 0.8125rem; }

/* ------------------------------------------------------------
   Post Header
   ------------------------------------------------------------ */
.post-header { margin-bottom: var(--spacing-2xl); }
.post-meta { display: flex; align-items: center; gap: var(--spacing-md); flex-wrap: wrap; font-size: 0.875rem; color: var(--color-text-secondary); margin-bottom: var(--spacing-md); }
.post-primary-tag {
  display: inline-block; padding: 2px var(--spacing-sm); font-size: 0.75rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.05em; background: var(--color-primary-light);
  color: var(--color-primary); border-radius: var(--radius-sm);
}
.post-primary-tag:hover { text-decoration: none; background: var(--color-primary); color: #fff; }

.post-title { margin-bottom: var(--spacing-lg); margin-top: 0; }

/* Answer-First Summary */
.post-summary {
  background: var(--color-surface);
  border-left: 4px solid var(--color-primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  padding: var(--spacing-lg) var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}
.post-summary p { font-size: 1.1rem; color: var(--color-text); margin-bottom: 0; }
[data-theme="dark"] .post-summary { background: var(--color-primary-light); }

/* Author Card (top) */
.post-author-card { display: flex; align-items: center; gap: var(--spacing-md); margin-bottom: var(--spacing-xl); padding: var(--spacing-md) 0; border-bottom: 1px solid var(--color-border-light); }
.author-avatar-wrap { flex-shrink: 0; }
.author-avatar { border-radius: 50%; width: 48px; height: 48px; object-fit: cover; }
.author-name { font-weight: 600; font-size: 0.9375rem; color: var(--color-text); }
.author-name:hover { color: var(--color-primary); text-decoration: none; }
.author-bio { font-size: 0.8125rem; color: var(--color-text-secondary); }

/* Feature Image */
.post-feature-image { margin-bottom: var(--spacing-2xl); border-radius: var(--radius-lg); overflow: hidden; }
.post-feature-img { width: 100%; border-radius: var(--radius-lg); }
.post-feature-image figcaption { font-size: 0.875rem; color: var(--color-text-secondary); text-align: center; margin-top: var(--spacing-sm); }

/* ------------------------------------------------------------
   Main Content Core — Typography & Rich Content
   ------------------------------------------------------------ */
.main-content-core { overflow-wrap: break-word; }
.main-content-core > *:first-child { margin-top: 0; }

/* Headings with anchor links */
.main-content-core h2, .main-content-core h3 { scroll-margin-top: calc(var(--header-height) + 20px); position: relative; }
.heading-anchor {
  position: absolute; left: -1.5em; top: 50%; transform: translateY(-50%);
  opacity: 0; color: var(--color-text-tertiary); transition: opacity var(--transition-fast);
  display: inline-flex; align-items: center; justify-content: center; width: 1.2em; height: 1.2em;
}
.main-content-core h2:hover .heading-anchor,
.main-content-core h3:hover .heading-anchor { opacity: 1; }
.heading-anchor:hover { color: var(--color-primary); }

/* Links in content */
.main-content-core a { text-decoration: underline; text-underline-offset: 2px; }

/* Images in content */
.main-content-core img { border-radius: var(--radius-md); margin: var(--spacing-lg) 0; }

/* Horizontal rules */
.main-content-core hr { border: none; border-top: 1px solid var(--color-border); margin: var(--spacing-2xl) 0; }

/* ------------------------------------------------------------
   Koenig Editor: Wide & Full Width Images
   ------------------------------------------------------------ */
.kg-width-wide { width: 100%; }
.kg-width-wide img { width: 100%; }
@media (min-width: 768px) {
  .kg-width-wide { width: calc(100% + var(--spacing-2xl)); margin-left: calc(-1 * var(--spacing-xl)); }
}
.kg-width-full { width: 100vw; position: relative; left: 50%; right: 50%; margin-left: -50vw; margin-right: -50vw; }
.kg-width-full img { width: 100%; }

/* ------------------------------------------------------------
   Tables
   ------------------------------------------------------------ */
.main-content-core table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
  margin: var(--spacing-xl) 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-border);
}
.main-content-core thead { background: var(--color-surface); }
.main-content-core th {
  padding: var(--spacing-sm) var(--spacing-md);
  text-align: left;
  font-weight: 600;
  border-bottom: 2px solid var(--color-border);
  white-space: nowrap;
}
.main-content-core td {
  padding: var(--spacing-sm) var(--spacing-md);
  border-bottom: 1px solid var(--color-border-light);
}
.main-content-core tr:last-child td { border-bottom: none; }
.main-content-core tbody tr:hover { background: var(--color-surface-hover); }

@media (max-width: 768px) {
  .main-content-core table { display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; white-space: nowrap; }
}

/* ------------------------------------------------------------
   Lists
   ------------------------------------------------------------ */
.main-content-core ul { list-style: none; padding-left: 0; margin: var(--spacing-lg) 0; }
.main-content-core ul li {
  position: relative; padding-left: 1.5em; margin-bottom: var(--spacing-sm);
}
.main-content-core ul li::marker { display: none; }
.main-content-core ul li::before {
  content: ''; position: absolute; left: 0; top: 0.6em;
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--color-primary);
}

.main-content-core ol { padding-left: 1.5rem; margin: var(--spacing-lg) 0; }
.main-content-core ol li { margin-bottom: var(--spacing-sm); padding-left: 0.25rem; }
.main-content-core ol li::marker { color: var(--color-primary); font-weight: 700; }

.main-content-core li p { margin-bottom: var(--spacing-xs); }

/* ------------------------------------------------------------
   Blockquote
   ------------------------------------------------------------ */
.main-content-core blockquote {
  border-left: 4px solid var(--color-blockquote-border);
  background: var(--color-blockquote-bg);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin: var(--spacing-xl) 0;
  padding: var(--spacing-lg) var(--spacing-xl);
  font-size: clamp(1rem, 2.2vw, 1.125rem);
  color: var(--color-text);
}
.main-content-core blockquote p { margin-bottom: var(--spacing-sm); }
.main-content-core blockquote p:last-child { margin-bottom: 0; }

/* ------------------------------------------------------------
   Code & Pre
   ------------------------------------------------------------ */
.main-content-core code {
  font-family: var(--font-mono); font-size: 0.875em;
  background: var(--color-surface); color: var(--color-primary);
  padding: 0.15em 0.4em; border-radius: var(--radius-sm); border: 1px solid var(--color-border-light);
  word-break: break-word;
}
.main-content-core pre {
  background: var(--color-code-bg); color: var(--color-code-text);
  padding: var(--spacing-lg) var(--spacing-xl);
  border-radius: var(--radius-md);
  overflow-x: auto; -webkit-overflow-scrolling: touch;
  margin: var(--spacing-xl) 0;
  font-size: 0.875rem; line-height: 1.6;
}
.main-content-core pre code {
  background: none; color: inherit; padding: 0; border: none; font-size: inherit;
}
@media (max-width: 768px) {
  .main-content-core pre { margin-left: calc(-1 * var(--spacing-lg)); margin-right: calc(-1 * var(--spacing-lg)); border-radius: 0; }
}

/* Inline code in headings */
.main-content-core h2 code, .main-content-core h3 code, .main-content-core h4 code { font-size: 0.8em; }

/* ------------------------------------------------------------
   FAQ / Details-Summary
   ------------------------------------------------------------ */
.main-content-core details {
  margin: var(--spacing-md) 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.main-content-core summary {
  padding: var(--spacing-md) var(--spacing-lg);
  font-weight: 600; cursor: pointer;
  background: var(--color-surface);
  list-style: none;
  display: flex; align-items: center; gap: var(--spacing-sm);
}
.main-content-core summary::-webkit-details-marker { display: none; }
.main-content-core summary::before {
  content: '+'; display: inline-flex; align-items: center; justify-content: center;
  font-size: 1.1rem; font-weight: 700; width: 1.2em; color: var(--color-primary);
  transition: transform var(--transition-fast);
}
.main-content-core details[open] summary::before { content: '\2212'; }
.main-content-core details .details-content,
.main-content-core details > :not(summary) { padding: var(--spacing-md) var(--spacing-lg); margin: 0; }

/* ------------------------------------------------------------
   Footer
   ------------------------------------------------------------ */
.site-footer { border-top: 1px solid var(--color-border); background: var(--color-surface); margin-top: var(--spacing-3xl); }
.footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-lg);
  flex-wrap: wrap;
}
.footer-info { font-size: 0.875rem; color: var(--color-text-secondary); }
.footer-info p { margin-bottom: 0; font-size: inherit; }
.footer-ghost { margin-top: var(--spacing-xs); }
.footer-nav { font-size: 0.875rem; }
.footer-nav ul { list-style: none; display: flex; gap: var(--spacing-md); padding-left: 0; }
.footer-nav a { color: var(--color-text-secondary); }
.footer-nav a:hover { color: var(--color-primary); }

/* ------------------------------------------------------------
   Pagination
   ------------------------------------------------------------ */
.pagination { margin-top: var(--spacing-3xl); }
.pagination-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--spacing-md); flex-wrap: wrap;
}
.pagination-numbers { display: flex; gap: var(--spacing-xs); }
.pagination-number, .pagination-current {
  display: inline-flex; align-items: center; justify-content: center;
  min-width: 2.25rem; height: 2.25rem; padding: 0 var(--spacing-sm);
  border-radius: var(--radius-sm); font-size: 0.9375rem;
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}
.pagination-number:hover { background: var(--color-primary-light); color: var(--color-primary); border-color: var(--color-primary); text-decoration: none; }
.pagination-current { background: var(--color-primary); color: #fff; border-color: var(--color-primary); font-weight: 600; }
.pagination-arrow { font-size: 0.9375rem; color: var(--color-text-secondary); padding: var(--spacing-xs) var(--spacing-sm); transition: color var(--transition-fast); }
.pagination-arrow:hover { color: var(--color-primary); text-decoration: none; }
.pagination-disabled { opacity: 0.4; pointer-events: none; }

/* ------------------------------------------------------------
   Share Button
   ------------------------------------------------------------ */
.share-btn {
  display: inline-flex; align-items: center; gap: var(--spacing-sm);
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-md); padding: var(--spacing-sm) var(--spacing-lg);
  font-size: 0.9375rem; color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}
.share-btn:hover { background: var(--color-primary-light); color: var(--color-primary); border-color: var(--color-primary); }
.share-icon { flex-shrink: 0; }
.share-copied-text { display: none; }
.share-btn.share-copied .share-label { display: none; }
.share-btn.share-copied .share-copied-text { display: inline; }

/* ------------------------------------------------------------
   Post Footer
   ------------------------------------------------------------ */
.post-footer { margin-top: var(--spacing-3xl); border-top: 1px solid var(--color-border); padding-top: var(--spacing-xl); }
.post-footer-row { display: flex; justify-content: space-between; align-items: center; gap: var(--spacing-md); flex-wrap: wrap; }
.post-tags-label { font-size: 0.875rem; font-weight: 600; color: var(--color-text-secondary); }
.post-tags { display: flex; align-items: center; gap: var(--spacing-sm); flex-wrap: wrap; }
.post-tag {
  display: inline-block; padding: 2px var(--spacing-sm); font-size: 0.8125rem;
  color: var(--color-text-secondary); background: var(--color-surface);
  border-radius: var(--radius-sm); border: 1px solid var(--color-border);
  transition: all var(--transition-fast);
}
.post-tag:hover { color: var(--color-primary); border-color: var(--color-primary); text-decoration: none; }

/* Author Full Card (bottom) */
.author-full-card { display: flex; gap: var(--spacing-lg); margin-top: var(--spacing-xl); padding: var(--spacing-lg); background: var(--color-surface); border-radius: var(--radius-lg); align-items: flex-start; }
.author-full-avatar img { width: 72px; height: 72px; border-radius: 50%; object-fit: cover; }
.author-full-name a { color: var(--color-text); font-size: 1.125rem; font-weight: 700; }
.author-full-name a:hover { color: var(--color-primary); text-decoration: none; }
.author-full-bio { font-size: 0.9375rem; color: var(--color-text-secondary); margin-top: var(--spacing-sm); }
.author-full-links { display: flex; gap: var(--spacing-md); margin-top: var(--spacing-sm); }
.author-link { font-size: 0.875rem; color: var(--color-primary); }

/* ------------------------------------------------------------
   Page Template
   ------------------------------------------------------------ */
.page-article { padding: var(--spacing-xl) var(--spacing-lg); }
.page-inner { max-width: var(--content-max); margin: 0 auto; }
.page-header { margin-bottom: var(--spacing-2xl); }
.page-title { margin-top: 0; margin-bottom: var(--spacing-lg); }
.page-feature-image { margin-bottom: var(--spacing-xl); border-radius: var(--radius-lg); overflow: hidden; }
.page-feature-img { width: 100%; border-radius: var(--radius-lg); }
.page-feature-image figcaption { font-size: 0.875rem; color: var(--color-text-secondary); text-align: center; margin-top: var(--spacing-sm); }

/* ------------------------------------------------------------
   Tag Page
   ------------------------------------------------------------ */
.tag-page { padding: var(--spacing-2xl) var(--spacing-lg); }
.tag-inner { max-width: var(--container-max); margin: 0 auto; }
.tag-header { margin-bottom: var(--spacing-2xl); text-align: center; }
.tag-name { margin-bottom: var(--spacing-md); }
.tag-description { max-width: 700px; margin: 0 auto var(--spacing-lg); color: var(--color-text-secondary); font-size: 1.0625rem; }
.tag-meta { font-size: 0.875rem; color: var(--color-text-tertiary); }
.tag-image { margin-bottom: var(--spacing-xl); border-radius: var(--radius-lg); overflow: hidden; }

/* ------------------------------------------------------------
   Author Page
   ------------------------------------------------------------ */
.author-page { padding: var(--spacing-2xl) var(--spacing-lg); }
.author-inner { max-width: var(--container-max); margin: 0 auto; }
.author-header { margin-bottom: var(--spacing-2xl); }
.author-profile { display: flex; gap: var(--spacing-xl); align-items: flex-start; flex-wrap: wrap; }
.author-profile-avatar img { width: 96px; height: 96px; border-radius: 50%; object-fit: cover; }
.author-profile-name { margin-top: 0; margin-bottom: var(--spacing-sm); }
.author-profile-bio { font-size: 1.0625rem; color: var(--color-text-secondary); max-width: 600px; }
.author-profile-meta { display: flex; gap: var(--spacing-md); margin-top: var(--spacing-sm); font-size: 0.9375rem; color: var(--color-text-secondary); }
.author-profile-social { display: flex; gap: var(--spacing-md); margin-top: var(--spacing-sm); }
.social-link { font-size: 0.9375rem; }
.author-stats { margin-top: var(--spacing-sm); font-size: 0.9375rem; color: var(--color-text-tertiary); }

/* ------------------------------------------------------------
   Error Page
   ------------------------------------------------------------ */
.error-page { display: flex; align-items: center; justify-content: center; min-height: 60vh; text-align: center; padding: var(--spacing-xl); }
.error-code { font-size: clamp(3rem, 10vw, 6rem); font-weight: 800; color: var(--color-primary); line-height: 1; margin-bottom: var(--spacing-md); }
.error-message { font-size: 1.25rem; color: var(--color-text-secondary); margin-bottom: var(--spacing-xl); }
.error-link { display: inline-block; padding: var(--spacing-sm) var(--spacing-xl); background: var(--color-primary); color: #fff; border-radius: var(--radius-md); font-weight: 600; transition: background var(--transition-fast); }
.error-link:hover { background: var(--color-primary-hover); color: #fff; text-decoration: none; }

/* ------------------------------------------------------------
   Landing Page
   ------------------------------------------------------------ */
.landing-page { padding: 0; }
.landing-hero { text-align: center; padding: var(--spacing-3xl) var(--spacing-lg) var(--spacing-2xl); background: var(--color-surface); }
.landing-title { margin-bottom: var(--spacing-md); }
.landing-subtitle { font-size: 1.25rem; color: var(--color-text-secondary); max-width: 600px; margin: 0 auto var(--spacing-xl); }
.landing-cta a { display: inline-block; padding: var(--spacing-sm) var(--spacing-xl); background: var(--color-primary); color: #fff; border-radius: var(--radius-md); font-weight: 600; transition: background var(--transition-fast); }
.landing-cta a:hover { background: var(--color-primary-hover); color: #fff; text-decoration: none; }

.landing-features { padding: var(--spacing-2xl) var(--spacing-lg); }
.features-grid { max-width: var(--container-max); margin: 0 auto; display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: var(--spacing-lg); }
.feature-card { display: block; padding: var(--spacing-lg); background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); text-align: center; transition: transform var(--transition-base), box-shadow var(--transition-base); color: var(--color-text); }
.feature-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); text-decoration: none; color: var(--color-text); }
.feature-title { font-size: 1.0625rem; margin-bottom: var(--spacing-xs); }
.feature-description { font-size: 0.875rem; color: var(--color-text-secondary); }

.landing-posts { padding: var(--spacing-2xl) var(--spacing-lg); }
.section-title { text-align: center; margin-bottom: var(--spacing-2xl); }
.landing-more { text-align: center; margin-top: var(--spacing-2xl); }
.landing-more a { display: inline-block; padding: var(--spacing-sm) var(--spacing-xl); border: 1px solid var(--color-primary); color: var(--color-primary); border-radius: var(--radius-md); font-weight: 600; transition: all var(--transition-fast); }
.landing-more a:hover { background: var(--color-primary); color: #fff; text-decoration: none; }

/* ------------------------------------------------------------
   Hub Page
   ------------------------------------------------------------ */
.hub-page { padding: var(--spacing-2xl) var(--spacing-lg); }
.hub-inner { max-width: var(--container-max); margin: 0 auto; }
.hub-header { text-align: center; margin-bottom: var(--spacing-2xl); }
.hub-title { margin-bottom: var(--spacing-sm); }
.hub-subtitle { font-size: 1.125rem; color: var(--color-text-secondary); }
.hub-tags { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: var(--spacing-lg); }
.hub-tag-card { display: flex; flex-direction: column; background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); overflow: hidden; transition: transform var(--transition-base), box-shadow var(--transition-base); color: var(--color-text); }
.hub-tag-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); text-decoration: none; color: var(--color-text); }
.hub-tag-image { aspect-ratio: 16/9; overflow: hidden; background: var(--color-border-light); }
.hub-tag-image img { width: 100%; height: 100%; object-fit: cover; }
.hub-tag-info { padding: var(--spacing-md) var(--spacing-lg); flex: 1; }
.hub-tag-name { font-size: 1.0625rem; margin-bottom: var(--spacing-xs); }
.hub-tag-desc { font-size: 0.875rem; color: var(--color-text-secondary); -webkit-line-clamp: 2; display: -webkit-box; -webkit-box-orient: vertical; overflow: hidden; }
.hub-tag-count { display: block; margin-top: var(--spacing-sm); font-size: 0.8125rem; color: var(--color-text-tertiary); }

/* ------------------------------------------------------------
   Buttons Utility
   ------------------------------------------------------------ */
.btn { display: inline-block; font-weight: 600; border: none; cursor: pointer; text-align: center; border-radius: var(--radius-md); transition: all var(--transition-fast); }
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: var(--color-primary-hover); color: #fff; text-decoration: none; }
.btn-secondary { background: transparent; color: var(--color-primary); border: 1px solid var(--color-primary); }
.btn-secondary:hover { background: var(--color-primary); color: #fff; text-decoration: none; }

/* ------------------------------------------------------------
   Responsive: Mobile Nav
   ------------------------------------------------------------ */
@media (max-width: 768px) {
  .nav-menu { display: none; position: absolute; top: var(--header-height); left: 0; right: 0; background: var(--color-background); border-bottom: 1px solid var(--color-border); padding: var(--spacing-md); flex-direction: column; align-items: stretch; box-shadow: var(--shadow-lg); }
  .nav-menu.nav-open { display: flex; }
  .nav-item a { padding: var(--spacing-sm) var(--spacing-md); }
  .nav-toggle { display: flex; }
  .post-feed-grid { grid-template-columns: 1fr; }
  .post-footer-row { flex-direction: column; align-items: flex-start; }
  .features-grid { grid-template-columns: 1fr 1fr; }
  .hub-tags { grid-template-columns: 1fr; }
}

/* ------------------------------------------------------------
   Utility: Screen Reader Only
   ------------------------------------------------------------ */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ------------------------------------------------------------
   Skip-to-content
   ------------------------------------------------------------ */
.skip-to-content {
  position: absolute; top: -100%; left: var(--spacing-md);
  background: var(--color-primary); color: #fff; padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-sm); font-weight: 600; z-index: 200;
  transition: top var(--transition-fast);
}
.skip-to-content:focus { top: var(--spacing-sm); text-decoration: none; color: #fff; }

/* ------------------------------------------------------------
   Breadcrumbs
   ------------------------------------------------------------ */
.c-breadcrumbs { padding: var(--spacing-md) var(--spacing-lg) 0; font-size: 0.8125rem; color: var(--color-text-tertiary); }
.c-breadcrumbs ol { list-style: none; padding-left: 0; display: flex; flex-wrap: wrap; gap: 0; margin: 0; }
.c-breadcrumbs li { display: inline-flex; align-items: center; }
.c-breadcrumbs li + li::before { content: '/'; margin: 0 var(--spacing-xs); color: var(--color-border); }
.c-breadcrumbs a { color: var(--color-text-secondary); text-decoration: none; }
.c-breadcrumbs a:hover { color: var(--color-primary); }
.c-breadcrumbs [aria-current="page"] { color: var(--color-text); }

/* ------------------------------------------------------------
   Search Page
   ------------------------------------------------------------ */
.search-page { padding: var(--spacing-2xl) var(--spacing-lg); }
.search-inner { max-width: var(--content-max); margin: 0 auto; }
.search-title { margin-bottom: var(--spacing-xl); }

/* ------------------------------------------------------------
   Error Recovery
   ------------------------------------------------------------ */
.error-recovery { display: flex; gap: var(--spacing-md); justify-content: center; flex-wrap: wrap; }

/* ------------------------------------------------------------
   Reduced Motion
   ------------------------------------------------------------ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ------------------------------------------------------------
   Post Comments
   ------------------------------------------------------------ */
.post-comments { padding: 0 var(--spacing-lg) var(--spacing-2xl); }
.comments-inner { max-width: var(--content-max); margin: 0 auto; border-top: 1px solid var(--color-border); padding-top: var(--spacing-xl); }
.comments-title { font-size: 1.25rem; margin-bottom: var(--spacing-lg); }

/* ------------------------------------------------------------
   Subscribe CTA
   ------------------------------------------------------------ */
.subscribe-cta { padding: var(--spacing-2xl) var(--spacing-lg); background: var(--color-surface); }
.cta-inner { max-width: var(--content-max); margin: 0 auto; text-align: center; }
.cta-title { margin-bottom: var(--spacing-sm); }
.cta-text { font-size: 1.0625rem; color: var(--color-text-secondary); margin-bottom: var(--spacing-lg); }
.cta-inner .btn { padding: var(--spacing-sm) var(--spacing-xl); font-size: 1rem; }

/* ------------------------------------------------------------
   Reading Progress Bar
   ------------------------------------------------------------ */
.reading-progress {
  position: fixed; top: 0; left: 0; height: 3px;
  background: var(--color-primary); width: 0%;
  z-index: 101; transition: width 0.05s linear;
}

/* ------------------------------------------------------------
   Empty State
   ------------------------------------------------------------ */
.empty-state { grid-column: 1 / -1; text-align: center; color: var(--color-text-tertiary); padding: var(--spacing-3xl) var(--spacing-lg); font-size: 1.125rem; }

/* ------------------------------------------------------------
   Related Posts
   ------------------------------------------------------------ */
.related-posts { padding: var(--spacing-2xl) var(--spacing-lg); border-top: 1px solid var(--color-border); }
.related-title { text-align: center; margin-bottom: var(--spacing-xl); }

/* ------------------------------------------------------------
   Copy Code Button
   ------------------------------------------------------------ */
.copy-code-btn {
  position: absolute; top: var(--spacing-sm); right: var(--spacing-sm);
  padding: 2px var(--spacing-sm); font-size: 0.75rem; font-family: var(--font-sans);
  font-weight: 600; border: 1px solid var(--color-border); border-radius: var(--radius-sm);
  background: var(--color-surface); color: var(--color-text-secondary); cursor: pointer;
  opacity: 0; transition: opacity var(--transition-fast);
}
.main-content-core pre:hover .copy-code-btn,
.main-content-core pre:focus-within .copy-code-btn { opacity: 1; }
.copy-code-btn:hover { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }

/* ------------------------------------------------------------
   Lightbox
   ------------------------------------------------------------ */
.lightbox-overlay {
  position: fixed; inset: 0; z-index: 9999;
  background: rgba(0,0,0,0.9); display: flex;
  align-items: center; justify-content: center;
  cursor: pointer;
}
.lightbox-img { max-width: 90vw; max-height: 90vh; object-fit: contain; border-radius: var(--radius-md); cursor: default; }
.lightbox-close {
  position: absolute; top: var(--spacing-lg); right: var(--spacing-lg);
  background: none; border: none; color: #fff; font-size: 2rem;
  line-height: 1; cursor: pointer; z-index: 1;
}
.lightbox-close:hover { color: var(--color-primary); }

/* ------------------------------------------------------------
   Print Styles
   ------------------------------------------------------------ */
@media print {
  .site-header, .site-footer, .article-sidebar, .post-share, .toc-nav, .nav-toggle, .theme-toggle { display: none !important; }
  .site-wrapper { display: block; }
  .site-main { padding-top: 0; }
  body { background: #fff; color: #000; font-size: 12pt; }
  a { color: #000; }
}