/* ============================================
   TOOLLOOM BLOG THEME — Standalone Design System
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #1e293b;
  --bg-card-hover: #334155;
  --bg-nav: rgba(15, 23, 42, 0.85);
  --bg-glass: rgba(30, 41, 59, 0.7);
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --text-link: #818cf8;
  --accent-start: #6366f1;
  --accent-end: #06b6d4;
  --accent-gradient: linear-gradient(135deg, var(--accent-start), var(--accent-end));
  --border-color: rgba(148, 163, 184, 0.12);
  --border-hover: rgba(99, 102, 241, 0.4);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 14px rgba(0,0,0,0.35);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 20px rgba(99,102,241,0.15);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'Fira Code', 'Consolas', monospace;
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --max-content: 1280px;
  --max-article: 780px;
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; font-size: 16px; }
body.blog-theme {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--text-link); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--accent-end); }
ul, ol { list-style: none; }

/* --- Reading Progress Bar --- */
.blog-progress-bar {
  position: fixed; top: 0; left: 0; height: 3px; z-index: 10001;
  background: var(--accent-gradient);
  width: 0%; transition: width 0.1s linear;
}

/* --- Navigation --- */
.blog-nav {
  position: sticky; top: 0; z-index: 10000;
  background: var(--bg-nav);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-color);
  transition: background var(--transition-smooth), box-shadow var(--transition-smooth);
}
.blog-nav.scrolled { box-shadow: var(--shadow-md); background: rgba(15,23,42,0.95); }
.blog-nav-inner {
  max-width: var(--max-content); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 24px; height: 64px;
}
.blog-nav-logo img { height: 32px; }
.blog-nav-logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.25rem; color: var(--text-primary); }

.blog-nav-menu { display: flex; align-items: center; gap: 4px; }
.blog-nav-menu > li { position: relative; }
.blog-nav-menu > li > a {
  display: flex; align-items: center; gap: 6px;
  padding: 8px 16px; border-radius: var(--radius-sm);
  font-size: 0.9rem; font-weight: 500; color: var(--text-secondary);
  transition: all var(--transition-fast);
}
.blog-nav-menu > li > a:hover,
.blog-nav-menu > li > a.active { color: var(--text-primary); background: rgba(99,102,241,0.1); }
.blog-nav-menu > li > a .nav-chevron {
  width: 14px; height: 14px; transition: transform var(--transition-fast);
}
.blog-nav-menu > li:hover > a .nav-chevron { transform: rotate(180deg); }

/* Tools Mega Dropdown */
.blog-tools-dropdown {
  position: absolute; top: 100%; right: 0;
  min-width: 720px; max-height: 75vh; overflow-y: auto;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: 24px 24px 16px;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 0 24px;
  opacity: 0; visibility: hidden;
  transform: translateY(4px);
  transition: opacity var(--transition-smooth), transform var(--transition-smooth), visibility var(--transition-smooth);
  pointer-events: none;
}
/* Invisible bridge to prevent hover gap */
.blog-nav-menu > li > .blog-tools-dropdown::before {
  content: ''; position: absolute; top: -12px; left: 0; right: 0; height: 12px;
}
.blog-nav-menu > li:hover > .blog-tools-dropdown {
  opacity: 1; visibility: visible; transform: translateY(0); pointer-events: auto;
}
.blog-tools-dropdown::-webkit-scrollbar { width: 5px; }
.blog-tools-dropdown::-webkit-scrollbar-track { background: transparent; }
.blog-tools-dropdown::-webkit-scrollbar-thumb { background: var(--text-muted); border-radius: 3px; }
.dropdown-category-group {
  padding-bottom: 16px; margin-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}
.dropdown-category-group:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }
.dropdown-category-title {
  font-size: 0.7rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 1.2px; color: var(--accent-end); margin-bottom: 10px;
  padding-bottom: 8px; border-bottom: 1px solid rgba(6,182,212,0.15);
  display: flex; align-items: center; gap: 8px;
}
.dropdown-category-title i { color: var(--accent-start); font-size: 0.8rem; width: 16px; text-align: center; }
.dropdown-tool-link {
  display: block; padding: 5px 8px 5px 24px; border-radius: var(--radius-sm);
  font-size: 0.84rem; color: var(--text-secondary); transition: all var(--transition-fast);
  position: relative;
}
.dropdown-tool-link::before {
  content: ''; position: absolute; left: 10px; top: 50%; transform: translateY(-50%);
  width: 4px; height: 4px; border-radius: 50%; background: var(--text-muted);
  transition: background var(--transition-fast);
}
.dropdown-tool-link:hover { background: rgba(99,102,241,0.1); color: var(--text-primary); }
.dropdown-tool-link:hover::before { background: var(--accent-start); }

/* Mobile Hamburger */
.blog-hamburger {
  display: none; flex-direction: column; gap: 5px; cursor: pointer;
  padding: 8px; background: none; border: none;
}
.blog-hamburger span {
  width: 22px; height: 2px; background: var(--text-primary);
  border-radius: 2px; transition: all var(--transition-fast);
}
.blog-hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.blog-hamburger.open span:nth-child(2) { opacity: 0; }
.blog-hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

/* Mobile Menu Drawer */
.blog-mobile-drawer {
  display: none; position: fixed; inset: 64px 0 0 0; z-index: 9999;
  background: var(--bg-primary); padding: 24px;
  overflow-y: auto; transform: translateX(100%);
  transition: transform var(--transition-smooth);
}
.blog-mobile-drawer.open { transform: translateX(0); }
.blog-mobile-drawer a {
  display: block; padding: 12px 0; font-size: 1rem; color: var(--text-secondary);
  border-bottom: 1px solid var(--border-color);
}
.blog-mobile-drawer a:hover { color: var(--text-primary); }
.mobile-tools-section { margin-top: 16px; }
.mobile-tools-section summary {
  cursor: pointer; padding: 12px 0; font-weight: 600; color: var(--text-primary);
  border-bottom: 1px solid var(--border-color); list-style: none;
  display: flex; align-items: center; justify-content: space-between;
}
.mobile-tools-section summary::after { content: '▾'; font-size: 0.8rem; }
.mobile-tools-section[open] summary::after { content: '▴'; }
.mobile-cat-title {
  font-size: 0.7rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 1px; color: var(--text-muted); padding: 16px 0 4px 8px;
}

/* --- Layout --- */
.blog-container { max-width: var(--max-content); margin: 0 auto; padding: 0 24px; }
.blog-main { padding: 40px 0 60px; }

/* --- Hero Section --- */
.blog-hero {
  text-align: center; padding: 48px 20px 40px;
  background: linear-gradient(180deg, rgba(99,102,241,0.06) 0%, transparent 100%);
}
.blog-hero h1 {
  font-size: clamp(2rem, 4vw, 3rem); font-weight: 800;
  background: var(--accent-gradient); -webkit-background-clip: text;
  -webkit-text-fill-color: transparent; background-clip: text;
  margin-bottom: 12px; line-height: 1.2;
}
.blog-hero p { font-size: 1.1rem; color: var(--text-secondary); max-width: 560px; margin: 0 auto; }

/* --- Card Grid --- */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.blog-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-smooth);
  display: flex; flex-direction: column;
}
.blog-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-glow);
}
.blog-card-img-wrap { position: relative; overflow: hidden; aspect-ratio: 16/9; }
.blog-card-img-wrap img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform var(--transition-smooth);
}
.blog-card:hover .blog-card-img-wrap img { transform: scale(1.05); }
.blog-card-img-wrap .card-badge {
  position: absolute; top: 12px; left: 12px;
  background: var(--accent-gradient);
  color: #fff; font-size: 0.7rem; font-weight: 600;
  padding: 4px 10px; border-radius: 20px; text-transform: uppercase; letter-spacing: 0.5px;
}
.blog-card-body { padding: 20px; display: flex; flex-direction: column; flex: 1; }
.blog-card-body h2 {
  font-size: 1.1rem; font-weight: 700; line-height: 1.4; margin-bottom: 10px;
}
.blog-card-body h2 a { color: var(--text-primary); }
.blog-card-body h2 a:hover { color: var(--text-link); }
.blog-card-excerpt {
  font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6;
  flex: 1; margin-bottom: 16px;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
}
.blog-card-meta {
  display: flex; align-items: center; gap: 16px;
  font-size: 0.8rem; color: var(--text-muted);
  padding-top: 14px; border-top: 1px solid var(--border-color);
}
.blog-card-meta span { display: flex; align-items: center; gap: 5px; }
.blog-card-meta svg { width: 14px; height: 14px; stroke: currentColor; fill: none; }

/* QA Card variation */
.qa-card { background: var(--bg-card); border: 1px solid var(--border-color); border-radius: var(--radius-md); padding: 24px; transition: all var(--transition-smooth); }
.qa-card:hover { border-color: var(--border-hover); box-shadow: var(--shadow-glow); transform: translateY(-2px); }
.qa-card + .qa-card { margin-top: 16px; }
.qa-card h2 { font-size: 1.15rem; font-weight: 700; margin-bottom: 8px; line-height: 1.5; }
.qa-card h2 a { color: var(--text-primary); }
.qa-card h2 a:hover { color: var(--text-link); }
.qa-card-excerpt { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.6; margin-bottom: 14px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.qa-card-footer { display: flex; align-items: center; justify-content: space-between; }
.qa-card-footer .qa-date { font-size: 0.8rem; color: var(--text-muted); display: flex; align-items: center; gap: 5px; }
.qa-card-footer .qa-read-btn {
  font-size: 0.8rem; font-weight: 600; color: var(--accent-start);
  display: flex; align-items: center; gap: 4px;
}
.qa-card-footer .qa-read-btn:hover { color: var(--accent-end); }
.qa-source-badge {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: 0.75rem; font-weight: 500; color: #f48024; background: rgba(244,128,36,0.1);
  padding: 3px 10px; border-radius: 20px;
}

/* --- Pagination --- */
.blog-pagination { display: flex; justify-content: center; align-items: center; gap: 6px; margin-top: 48px; }
.blog-pagination a, .blog-pagination span {
  display: flex; align-items: center; justify-content: center;
  min-width: 40px; height: 40px; padding: 0 12px;
  border-radius: var(--radius-sm); font-size: 0.9rem; font-weight: 500;
  border: 1px solid var(--border-color); color: var(--text-secondary);
  transition: all var(--transition-fast);
}
.blog-pagination a:hover { border-color: var(--accent-start); color: var(--text-primary); background: rgba(99,102,241,0.1); }
.blog-pagination .current { background: var(--accent-gradient); color: #fff; border-color: transparent; font-weight: 700; }
.blog-pagination .disabled { opacity: 0.3; pointer-events: none; }
.blog-pagination .ellipsis { border: none; color: var(--text-muted); }

/* --- Breadcrumbs --- */
.blog-breadcrumbs {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  font-size: 0.85rem; color: var(--text-muted); margin-bottom: 24px;
}
.blog-breadcrumbs a { color: var(--text-secondary); }
.blog-breadcrumbs a:hover { color: var(--text-link); }
.blog-breadcrumbs .bc-sep { color: var(--text-muted); font-size: 0.7rem; }
.blog-breadcrumbs .bc-current { color: var(--text-primary); font-weight: 500; }

/* --- Article Detail --- */
.article-layout {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 40px;
  max-width: 1100px;
  margin: 0 auto;
}
.article-content { min-width: 0; }
.article-sidebar { position: relative; }
.article-sidebar-inner { position: sticky; top: 84px; }

.article-header { margin-bottom: 32px; }
.article-header h1 {
  font-size: clamp(1.8rem, 3.5vw, 2.5rem); font-weight: 800;
  line-height: 1.3; margin-bottom: 16px;
}
.article-meta {
  display: flex; align-items: center; flex-wrap: wrap; gap: 16px;
  font-size: 0.85rem; color: var(--text-muted);
}
.article-meta span { display: flex; align-items: center; gap: 5px; }
.article-meta svg { width: 15px; height: 15px; stroke: currentColor; fill: none; }
.article-featured-img {
  width: 100%; border-radius: var(--radius-lg); margin: 28px 0;
  aspect-ratio: 16/9; object-fit: cover;
}

/* Article Body Typography */
.article-body { font-size: 1.05rem; line-height: 1.85; color: var(--text-primary); }
.article-body h2 { font-size: 1.6rem; font-weight: 700; margin: 40px 0 16px; padding-top: 20px; border-top: 1px solid var(--border-color); }
.article-body h3 { font-size: 1.3rem; font-weight: 600; margin: 32px 0 12px; }
.article-body h4 { font-size: 1.1rem; font-weight: 600; margin: 24px 0 10px; }
.article-body p { margin-bottom: 18px; }
.article-body ul, .article-body ol { padding-left: 24px; margin-bottom: 18px; }
.article-body ul { list-style: disc; }
.article-body ol { list-style: decimal; }
.article-body li { margin-bottom: 6px; }
.article-body blockquote {
  border-left: 3px solid var(--accent-start); padding: 16px 20px;
  margin: 24px 0; background: rgba(99,102,241,0.06); border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-secondary); font-style: italic;
}
.article-body a { color: var(--text-link); text-decoration: underline; text-underline-offset: 3px; }
.article-body img { border-radius: var(--radius-md); margin: 24px 0; }
.article-body pre {
  background: #0d1117 !important; border: 1px solid var(--border-color);
  border-radius: var(--radius-md) !important; padding: 20px !important;
  margin: 24px 0 !important; overflow-x: auto; font-size: 0.88rem !important;
}
.article-body code {
  font-family: var(--font-mono) !important; font-size: 0.88rem !important;
}
.article-body p code, .article-body li code {
  background: rgba(99,102,241,0.12); padding: 2px 7px;
  border-radius: 4px; font-size: 0.85em;
}
.article-body table {
  width: 100%; border-collapse: collapse; margin: 24px 0;
  border: 1px solid var(--border-color); border-radius: var(--radius-sm); overflow: hidden;
}
.article-body th, .article-body td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--border-color); font-size: 0.95rem; }
.article-body th { background: var(--bg-secondary); font-weight: 600; color: var(--text-primary); }
.article-body td { color: var(--text-secondary); }

/* Table of Contents (Sidebar) */
.toc-widget {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius-md); padding: 20px;
  margin-bottom: 24px;
}
.toc-widget-title {
  font-size: 0.75rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 1px; color: var(--text-muted); margin-bottom: 14px;
}
.toc-list a {
  display: block; padding: 6px 0; font-size: 0.85rem;
  color: var(--text-secondary); border-left: 2px solid transparent;
  padding-left: 12px; transition: all var(--transition-fast);
}
.toc-list a:hover, .toc-list a.active {
  color: var(--text-link); border-left-color: var(--accent-start);
}
.toc-list a.toc-h3 { padding-left: 24px; font-size: 0.8rem; }

/* Recommended Tools Widget */
.tools-widget {
  background: var(--bg-card); border: 1px solid var(--border-color);
  border-radius: var(--radius-md); padding: 20px;
}
.tools-widget-title {
  font-size: 0.75rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: 1px; color: var(--text-muted); margin-bottom: 14px;
}
.tools-widget a {
  display: flex; align-items: center; gap: 10px;
  padding: 8px; border-radius: var(--radius-sm);
  font-size: 0.85rem; color: var(--text-secondary);
  transition: all var(--transition-fast);
}
.tools-widget a:hover { background: rgba(99,102,241,0.08); color: var(--text-primary); }
.tools-widget a i { color: var(--accent-start); width: 18px; text-align: center; }

/* --- Related Content --- */
.related-section { margin-top: 60px; padding-top: 40px; border-top: 1px solid var(--border-color); }
.related-section-title {
  font-size: 1.4rem; font-weight: 700; margin-bottom: 24px;
  display: flex; align-items: center; gap: 10px;
}
.related-section-title::before {
  content: ''; width: 4px; height: 24px; border-radius: 2px;
  background: var(--accent-gradient);
}
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }

/* --- Footer --- */
.blog-footer {
  background: var(--bg-secondary); border-top: 1px solid var(--border-color);
  padding: 40px 24px; margin-top: 80px;
}
.blog-footer-inner {
  max-width: var(--max-content); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px;
}
.blog-footer-copy { font-size: 0.85rem; color: var(--text-muted); }
.blog-footer-links { display: flex; gap: 20px; }
.blog-footer-links a { font-size: 0.85rem; color: var(--text-secondary); }
.blog-footer-links a:hover { color: var(--text-link); }

/* --- Empty State --- */
.blog-empty {
  text-align: center; padding: 80px 20px; color: var(--text-muted);
}
.blog-empty svg { width: 64px; height: 64px; margin-bottom: 16px; stroke: var(--text-muted); }
.blog-empty h2 { font-size: 1.3rem; font-weight: 600; color: var(--text-secondary); margin-bottom: 8px; }

/* --- Share Buttons --- */
.share-buttons { display: flex; gap: 8px; margin-top: 16px; }
.share-btn {
  display: flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--bg-card); border: 1px solid var(--border-color);
  color: var(--text-secondary); font-size: 0.9rem;
  transition: all var(--transition-fast); cursor: pointer;
}
.share-btn:hover { border-color: var(--accent-start); color: var(--accent-start); background: rgba(99,102,241,0.1); }

/* --- Back to top --- */
.back-to-top {
  position: fixed; bottom: 24px; right: 24px; z-index: 9000;
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--accent-gradient); border: none; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; visibility: hidden; transform: translateY(10px);
  transition: all var(--transition-smooth);
  box-shadow: var(--shadow-md);
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top svg { width: 20px; height: 20px; stroke: #fff; fill: none; }

/* --- Responsive --- */
@media (max-width: 1200px) {
  .blog-grid { grid-template-columns: repeat(2, 1fr); }
  .related-grid { grid-template-columns: repeat(2, 1fr); }
  .blog-tools-dropdown { min-width: 540px; grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 900px) {
  .article-layout { grid-template-columns: 1fr; }
  .article-sidebar { display: none; }
}
@media (max-width: 768px) {
  .blog-grid { grid-template-columns: 1fr; gap: 20px; }
  .related-grid { grid-template-columns: 1fr; }
  .blog-nav-menu { display: none; }
  .blog-hamburger { display: flex; }
  .blog-mobile-drawer { display: block; }
  .blog-hero { padding: 32px 16px 24px; }
  .blog-hero h1 { font-size: 1.8rem; }
  .blog-container { padding: 0 16px; }
  .blog-main { padding: 24px 0 40px; }
  .blog-footer-inner { flex-direction: column; text-align: center; }
  .blog-tools-dropdown { display: none !important; }
  .article-header h1 { font-size: 1.6rem; }
}
@media (max-width: 480px) {
  .blog-card-body { padding: 16px; }
  .blog-pagination a, .blog-pagination span { min-width: 36px; height: 36px; font-size: 0.85rem; }
  .article-meta { flex-direction: column; align-items: flex-start; gap: 8px; }
}

/* --- Prism Override for dark theme --- */
.article-body pre[class*="language-"] { background: #0d1117 !important; }
.article-body .token.comment { color: #8b949e !important; }
.article-body .token.keyword { color: #ff7b72 !important; }
.article-body .token.string { color: #a5d6ff !important; }
.article-body .token.function { color: #d2a8ff !important; }
.article-body .token.number { color: #79c0ff !important; }

/* Print styles */
@media print {
  .blog-nav, .blog-footer, .blog-progress-bar, .back-to-top, .share-buttons,
  .article-sidebar, .related-section { display: none !important; }
  body.blog-theme { background: #fff; color: #000; }
  .article-body a { color: #000; text-decoration: underline; }
}