/* Blog-specific styles — extends main site design system */
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,600;0,700;0,900;1,400;1,700&family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

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

:root {
  --ink: #111111;
  --ink-light: #444444;
  --ink-muted: #888888;
  --paper: #faf9f6;
  --paper-dark: #f0ede6;
  --red: #c0392b;
  --red-dark: #a93226;
  --border: #e0dbd2;
  --white: #ffffff;
  --font-serif: 'Playfair Display', Georgia, serif;
  --font-sans: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --max-w: 1100px;
  --prose-w: 720px;
}

html { scroll-behavior: smooth; }
body { background: var(--paper); color: var(--ink); font-family: var(--font-sans); font-size: 16px; line-height: 1.6; -webkit-font-smoothing: antialiased; }

/* NAV — scoped to page nav, not .toc nav */
nav:not(.toc) { position: sticky; top: 0; z-index: 100; background: var(--paper); border-bottom: 1px solid var(--border); padding: 0 24px; }
.nav-inner { max-width: var(--max-w); margin: 0 auto; display: flex; align-items: center; justify-content: space-between; height: 60px; }
.logo { font-family: var(--font-serif); font-size: 20px; font-weight: 700; color: var(--ink); text-decoration: none; }
.logo span { color: var(--red); }
.nav-links { display: flex; align-items: center; gap: 28px; }
.nav-links a { color: var(--ink-light); text-decoration: none; font-size: 14px; font-weight: 500; transition: color 0.15s; }
.nav-links a:hover { color: var(--ink); }
.btn-nav { background: var(--ink) !important; color: var(--white) !important; padding: 8px 16px; border-radius: 4px; font-size: 13px !important; }
.btn-nav:hover { background: var(--red) !important; }

/* ARTICLE LAYOUT */
.article-wrap { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; display: grid; grid-template-columns: 1fr 300px; gap: 64px; padding-top: 56px; padding-bottom: 96px; }

/* ARTICLE HEADER */
.article-header { max-width: var(--prose-w); margin-bottom: 40px; }
.post-category { display: inline-block; font-family: var(--font-mono); font-size: 10px; font-weight: 500; letter-spacing: 2px; text-transform: uppercase; color: var(--red); border: 1px solid var(--red); padding: 4px 10px; border-radius: 2px; margin-bottom: 20px; text-decoration: none; }
.article-header h1 { font-family: var(--font-serif); font-size: clamp(30px, 4vw, 48px); font-weight: 900; line-height: 1.15; letter-spacing: -1px; color: var(--ink); margin-bottom: 20px; }
.article-meta { display: flex; align-items: center; gap: 20px; font-size: 13px; color: var(--ink-muted); padding: 16px 0; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); margin-bottom: 32px; }
.article-meta span { display: flex; align-items: center; gap: 6px; }
.article-lede { font-size: 18px; color: var(--ink-light); line-height: 1.7; max-width: var(--prose-w); margin-bottom: 40px; font-family: var(--font-serif); font-style: italic; }

/* TABLE OF CONTENTS — in sidebar */
.toc { background: var(--paper-dark); border: 1px solid var(--border); border-radius: 6px; padding: 20px 24px; margin-bottom: 20px; }
.toc-title { font-family: var(--font-mono); font-size: 10px; font-weight: 500; letter-spacing: 2px; text-transform: uppercase; color: var(--ink-muted); margin-bottom: 14px; }
.toc ol { padding-left: 20px; display: flex; flex-direction: column; gap: 6px; }
.toc li a { font-size: 14px; color: var(--ink-light); text-decoration: none; line-height: 1.4; transition: color 0.15s; }
.toc li a:hover { color: var(--red); }

/* PROSE */
.prose { max-width: var(--prose-w); }
.prose h2 { font-family: var(--font-serif); font-size: clamp(22px, 2.5vw, 30px); font-weight: 700; line-height: 1.25; letter-spacing: -0.3px; color: var(--ink); margin: 48px 0 16px; padding-top: 8px; }
.prose h3 { font-family: var(--font-serif); font-size: clamp(18px, 2vw, 22px); font-weight: 700; color: var(--ink); margin: 32px 0 12px; }
.prose p { color: var(--ink-light); line-height: 1.78; margin-bottom: 20px; font-size: 16px; }
.prose p strong { color: var(--ink); font-weight: 600; }
.prose ul, .prose ol { padding-left: 24px; margin-bottom: 24px; }
.prose li { color: var(--ink-light); line-height: 1.7; margin-bottom: 8px; font-size: 16px; }
.prose li strong { color: var(--ink); }
.prose a { color: var(--red); text-decoration: underline; text-underline-offset: 3px; }
.prose a:hover { color: var(--red-dark); }

.prose blockquote { border-left: 3px solid var(--red); padding: 16px 20px; margin: 32px 0; background: var(--paper-dark); font-family: var(--font-serif); font-size: 17px; font-style: italic; color: var(--ink); }
.prose blockquote cite { display: block; font-family: var(--font-sans); font-size: 12px; font-style: normal; color: var(--ink-muted); margin-top: 8px; }

.prose .callout { background: var(--paper-dark); border: 1px solid var(--border); border-left: 3px solid var(--red); border-radius: 0 6px 6px 0; padding: 20px 24px; margin: 32px 0; }
.prose .callout p { margin-bottom: 0; }

.prose table { width: 100%; border-collapse: collapse; margin: 32px 0; font-size: 14px; }
.prose th { background: var(--ink); color: var(--white); padding: 12px 16px; text-align: left; font-weight: 600; font-size: 13px; }
.prose td { padding: 12px 16px; border-bottom: 1px solid var(--border); color: var(--ink-light); vertical-align: top; }
.prose tr:hover td { background: var(--paper-dark); }

.prose .key-num { font-family: var(--font-serif); font-size: 40px; font-weight: 700; color: var(--red); line-height: 1; display: block; margin-bottom: 4px; }

/* POST CTA */
.post-cta { background: var(--ink); border-radius: 8px; padding: 40px; margin: 48px 0; max-width: var(--prose-w); }
.post-cta h3 { font-family: var(--font-serif); font-size: 24px; font-weight: 700; color: var(--white); margin-bottom: 12px; }
.post-cta p { color: #aaaaaa; font-size: 15px; margin-bottom: 20px; }
.post-cta a { display: inline-block; background: var(--red); color: var(--white); padding: 12px 24px; border-radius: 4px; font-size: 14px; font-weight: 600; text-decoration: none; transition: background 0.15s; }
.post-cta a:hover { background: var(--red-dark); }

/* SIDEBAR — sticky, scrolls with page */
.sidebar { padding-top: 0; position: sticky; top: 76px; align-self: start; max-height: calc(100vh - 96px); overflow-y: auto; scrollbar-width: none; }
.sidebar::-webkit-scrollbar { display: none; }
.sidebar-card { background: var(--white); border: 1px solid var(--border); border-radius: 6px; padding: 24px; margin-bottom: 20px; }
.sidebar-title { font-family: var(--font-mono); font-size: 10px; font-weight: 500; letter-spacing: 2px; text-transform: uppercase; color: var(--ink-muted); margin-bottom: 16px; }
.sidebar-card h3 { font-family: var(--font-serif); font-size: 16px; font-weight: 700; color: var(--ink); margin-bottom: 8px; line-height: 1.3; }
.sidebar-card p { font-size: 13px; color: var(--ink-light); line-height: 1.6; margin-bottom: 14px; }
.sidebar-card a.btn-side { display: block; text-align: center; background: var(--red); color: var(--white); padding: 10px 16px; border-radius: 4px; font-size: 13px; font-weight: 600; text-decoration: none; transition: background 0.15s; }
.sidebar-card a.btn-side:hover { background: var(--red-dark); }

.related-posts { list-style: none; display: flex; flex-direction: column; gap: 12px; }
.related-posts li a { font-size: 14px; color: var(--ink); text-decoration: none; line-height: 1.4; font-weight: 500; transition: color 0.15s; }
.related-posts li a:hover { color: var(--red); }
.related-posts li span { display: block; font-size: 12px; color: var(--ink-muted); margin-top: 2px; }

/* FAQ */
.faq-section { max-width: var(--prose-w); margin-top: 48px; }
.faq-section h2 { font-family: var(--font-serif); font-size: 26px; font-weight: 700; margin-bottom: 24px; }
.faq-item { border-bottom: 1px solid var(--border); }
.faq-item summary { font-size: 15px; font-weight: 600; color: var(--ink); padding: 18px 0; cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 16px; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '+'; font-size: 20px; font-weight: 300; color: var(--ink-muted); flex-shrink: 0; }
.faq-item[open] summary::after { content: '−'; }
.faq-item p { font-size: 14px; color: var(--ink-light); line-height: 1.7; padding-bottom: 18px; }

/* BLOG INDEX */
.blog-header { padding: 64px 0 48px; border-bottom: 1px solid var(--border); }
.blog-header h1 { font-family: var(--font-serif); font-size: clamp(36px, 5vw, 56px); font-weight: 900; letter-spacing: -1px; margin-bottom: 12px; }
.blog-header p { font-size: 17px; color: var(--ink-light); max-width: 500px; }
.blog-grid { max-width: var(--max-w); margin: 0 auto; padding: 56px 24px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.post-card { position: relative; background: var(--white); border: 1px solid var(--border); border-radius: 6px; padding: 28px; display: flex; flex-direction: column; gap: 12px; transition: border-color 0.15s, transform 0.15s; cursor: pointer; }
.post-card:hover { border-color: var(--red); transform: translateY(-2px); }
.post-card-cat { font-family: var(--font-mono); font-size: 10px; font-weight: 500; letter-spacing: 1.5px; text-transform: uppercase; color: var(--red); }
.post-card h2 { font-family: var(--font-serif); font-size: 18px; font-weight: 700; line-height: 1.35; color: var(--ink); }
.post-card h2 a { text-decoration: none; color: inherit; }
.post-card h2 a::after { content: ''; position: absolute; inset: 0; border-radius: 6px; }
.post-card h2 a:hover { color: var(--red); }
.post-card p { font-size: 13px; color: var(--ink-muted); line-height: 1.6; flex: 1; }
.post-card-meta { font-size: 12px; color: var(--ink-muted); display: flex; gap: 12px; padding-top: 8px; border-top: 1px solid var(--border); }
.read-more { font-size: 13px; font-weight: 600; color: var(--red); text-decoration: none; }
.read-more:hover { color: var(--red-dark); }

/* FOOTER */
footer { background: var(--ink); border-top: 1px solid #222; padding: 32px 24px; }
.footer-inner { max-width: var(--max-w); margin: 0 auto; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px; }
.footer-logo { font-family: var(--font-serif); font-size: 18px; font-weight: 700; color: var(--white); }
.footer-logo span { color: var(--red); }
.footer-links { display: flex; gap: 24px; flex-wrap: wrap; }
.footer-links a { font-size: 13px; color: #666; text-decoration: none; transition: color 0.15s; }
.footer-links a:hover { color: var(--white); }
.footer-copy { font-size: 12px; color: #444; }

@media (max-width: 900px) {
  .article-wrap { grid-template-columns: 1fr; gap: 40px; }
  .sidebar { display: none; }
  .blog-grid { grid-template-columns: 1fr 1fr; }
  .nav-links { display: none; }
}
@media (max-width: 600px) {
  .blog-grid { grid-template-columns: 1fr; }
  .article-header h1 { font-size: 28px; }
}