/*
 * PainMap Blog Stylesheet
 * Standalone CSS for static blog pages — no Tailwind/bundler required.
 * Mirrors the PainMap design system defined in src/index.css:
 *   Primary:    hsl(239, 84%, 67%)  — indigo/violet
 *   Secondary:  hsl(173, 58%, 39%)  — teal-green
 *   Foreground: hsl(222, 47%, 11%)  — dark navy
 *   Fonts: Nunito (headings), DM Sans (body), DM Mono (code)
 */

/* ── Fonts ──────────────────────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=DM+Mono:wght@400;500&family=DM+Sans:wght@400;500;600;700&family=Nunito:wght@700;800;900&display=swap');

/* ── Design Tokens ───────────────────────────────────────────────────── */
:root {
  --primary:        hsl(239, 84%, 67%);
  --primary-light:  hsl(239, 100%, 95%);
  --secondary:      hsl(173, 58%, 39%);
  --secondary-light:hsl(173, 58%, 94%);
  --success:        hsl(160, 84%, 39%);
  --fg:             hsl(222, 47%, 11%);
  --muted:          hsl(215, 16%, 47%);
  --border:         hsl(214, 32%, 91%);
  --accent-bg:      hsl(210, 40%, 96%);
  --bg:             #ffffff;
  --card-bg:        rgba(255, 255, 255, 0.78);
  --radius:         0.75rem;
  --font-heading:   'Nunito', sans-serif;
  --font-body:      'DM Sans', sans-serif;
  --font-mono:      'DM Mono', monospace;
  --max-content:    720px;
  --max-page:       1200px;
}

/* ── Reset ───────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font-body);
  font-size: 18px;
  line-height: 1.7;
  color: var(--fg);
  background: var(--bg);
}
img { display: block; max-width: 100%; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Layout Helpers ──────────────────────────────────────────────────── */
.container {
  max-width: var(--max-page);
  margin: 0 auto;
  padding: 0 24px;
}
@media (max-width: 768px) { .container { padding: 0 16px; } }

/* ── Navigation ──────────────────────────────────────────────────────── */
.blog-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.blog-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.nav-logo {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 20px;
  color: var(--fg);
  text-decoration: none;
  letter-spacing: -0.02em;
}
.nav-logo span { color: var(--primary); }
.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
}
.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.15s;
}
.nav-link:hover { color: var(--fg); text-decoration: none; }
.nav-link.active { color: var(--fg); font-weight: 600; }
.nav-cta {
  display: inline-flex;
  align-items: center;
  padding: 8px 18px;
  background: var(--primary);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  border-radius: 999px;
  text-decoration: none;
  transition: opacity 0.15s;
}
.nav-cta:hover { opacity: 0.88; text-decoration: none; }

/* ── Breadcrumb ──────────────────────────────────────────────────────── */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--muted);
  padding: 20px 0 0;
}
.breadcrumb a { color: var(--muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb-sep { color: var(--border); }
.breadcrumb-current { color: var(--fg); font-weight: 500; }

/* ── Article Hero Header ─────────────────────────────────────────────── */
.article-hero {
  padding: 40px 0 32px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 48px;
}
.article-category {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-radius: 999px;
  margin-bottom: 20px;
}
.article-hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(28px, 5vw, 48px);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--fg);
  max-width: 820px;
  margin-bottom: 20px;
}
.article-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 14px;
  color: var(--muted);
}
.article-meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
}
.article-meta-dot {
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--border);
}

/* ── Two-Column Layout: TOC + Content ────────────────────────────────── */
.article-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 48px;
  align-items: start;
  padding-bottom: 80px;
}
@media (max-width: 1024px) {
  .article-layout { grid-template-columns: 1fr; }
  .toc-sidebar { display: none; }
}

/* ── Table of Contents ───────────────────────────────────────────────── */
.toc-sidebar {
  position: sticky;
  top: 80px;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
}
.toc-inner {
  background: var(--accent-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}
.toc-title {
  font-family: var(--font-heading);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 14px;
}
.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.toc-list li a {
  display: block;
  font-size: 13px;
  line-height: 1.4;
  color: var(--muted);
  text-decoration: none;
  padding: 4px 8px;
  border-radius: 6px;
  transition: all 0.15s;
}
.toc-list li a:hover,
.toc-list li a.active {
  color: var(--primary);
  background: var(--primary-light);
  text-decoration: none;
}
.toc-list .toc-h3 a { padding-left: 20px; font-size: 12px; }

/* ── Article Body Prose ──────────────────────────────────────────────── */
.article-body {
  max-width: var(--max-content);
  min-width: 0;
}
.article-body p {
  margin-bottom: 24px;
  color: var(--fg);
}
.article-body h2 {
  font-family: var(--font-heading);
  font-size: 26px;
  font-weight: 800;
  letter-spacing: -0.025em;
  line-height: 1.25;
  color: var(--fg);
  margin: 48px 0 20px;
  padding-top: 8px;
  border-top: 2px solid var(--primary);
  padding-top: 20px;
}
.article-body h3 {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.3;
  color: var(--fg);
  margin: 36px 0 14px;
}
.article-body h4 {
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 700;
  color: var(--fg);
  margin: 24px 0 10px;
}
.article-body ul, .article-body ol {
  margin: 0 0 24px 24px;
}
.article-body li {
  margin-bottom: 8px;
  line-height: 1.65;
}
.article-body strong { font-weight: 700; color: var(--fg); }
.article-body em { font-style: italic; }
.article-body a { color: var(--primary); text-decoration: underline; text-underline-offset: 3px; }
.article-body a:hover { opacity: 0.8; }
.article-body hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 40px 0;
}
.article-body blockquote {
  border-left: 3px solid var(--primary);
  padding: 12px 20px;
  margin: 24px 0;
  background: var(--primary-light);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-style: italic;
  color: var(--muted);
}
.article-body code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--accent-bg);
  border: 1px solid var(--border);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--fg);
}
.article-body pre {
  background: hsl(222, 47%, 11%);
  border-radius: var(--radius);
  padding: 20px;
  overflow-x: auto;
  margin: 24px 0;
}
.article-body pre code {
  background: none;
  border: none;
  padding: 0;
  color: #e2e8f0;
  font-size: 14px;
}

/* ── Comparison Table ────────────────────────────────────────────────── */
.article-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  margin: 32px 0;
  overflow-x: auto;
  display: block;
}
.article-body thead th {
  text-align: left;
  padding: 10px 14px;
  background: var(--fg);
  color: #fff;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.article-body thead th:first-child { border-radius: 8px 0 0 0; }
.article-body thead th:last-child  { border-radius: 0 8px 0 0; }
.article-body tbody tr:nth-child(even) { background: var(--accent-bg); }
.article-body tbody tr:hover { background: var(--primary-light); }
.article-body tbody td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
  line-height: 1.4;
  white-space: nowrap;
}
.article-body tbody td:first-child { font-weight: 600; color: var(--fg); }

/* ── Blog CTA Block ──────────────────────────────────────────────────── */
.blog-cta {
  background: linear-gradient(135deg, hsl(239, 84%, 97%), hsl(173, 58%, 94%));
  border: 1.5px solid var(--primary);
  border-radius: var(--radius);
  padding: 28px 32px;
  margin: 40px 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.blog-cta-eyebrow {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--primary);
}
.blog-cta h3 {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--fg);
  margin: 0;
}
.blog-cta p {
  font-size: 15px;
  color: var(--muted);
  margin: 0;
}
.blog-cta .blog-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  background: var(--primary);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  border-radius: 999px;
  text-decoration: none;
  width: max-content;
  margin-top: 4px;
  transition: opacity 0.15s;
}
.blog-cta .blog-cta-btn:hover { opacity: 0.88; text-decoration: none; }

/* ── Share Buttons ───────────────────────────────────────────────────── */
.share-section {
  padding: 32px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin: 48px 0;
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.share-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  color: var(--fg);
  text-decoration: none;
  background: var(--bg);
  cursor: pointer;
  transition: all 0.15s;
}
.share-btn:hover { border-color: var(--primary); color: var(--primary); text-decoration: none; }

/* ── Blog Index Page ─────────────────────────────────────────────────── */
.blog-hero {
  padding: 64px 0 48px;
  border-bottom: 1px solid var(--border);
}
.blog-hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--secondary);
  margin-bottom: 16px;
}
.blog-hero-eyebrow::before {
  content: '';
  display: block;
  width: 20px;
  height: 2px;
  background: var(--secondary);
  border-radius: 2px;
}
.blog-hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1.1;
  color: var(--fg);
  margin-bottom: 16px;
}
.blog-hero p {
  font-size: 18px;
  color: var(--muted);
  max-width: 600px;
  line-height: 1.65;
}

/* ── Blog Post Grid ──────────────────────────────────────────────────── */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  padding: 48px 0;
}
@media (max-width: 768px) { .blog-grid { grid-template-columns: 1fr; } }

/* ── Post Card ───────────────────────────────────────────────────────── */
.post-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  text-decoration: none;
  color: inherit;
}
.post-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px -8px rgba(99, 102, 241, 0.12);
  text-decoration: none;
}
.post-card-category {
  display: inline-flex;
  padding: 3px 10px;
  background: var(--primary-light);
  color: var(--primary);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  border-radius: 999px;
  width: max-content;
}
.post-card h2 {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.3;
  color: var(--fg);
}
.post-card p {
  font-size: 15px;
  color: var(--muted);
  line-height: 1.6;
  flex: 1;
}
.post-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  color: var(--muted);
}

/* ── Related Posts ───────────────────────────────────────────────────── */
.related-section {
  padding: 48px 0;
  border-top: 1px solid var(--border);
}
.related-section h2 {
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
  color: var(--fg);
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
@media (max-width: 640px) { .related-grid { grid-template-columns: 1fr; } }

/* ── Back Link ───────────────────────────────────────────────────────── */
.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--muted);
  text-decoration: none;
  padding: 20px 0 8px;
  transition: color 0.15s;
}
.back-link:hover { color: var(--primary); }

/* ── Footer ──────────────────────────────────────────────────────────── */
.blog-footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  margin-top: 48px;
}
.blog-footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
  color: var(--muted);
}
.blog-footer a { color: var(--muted); text-decoration: none; }
.blog-footer a:hover { color: var(--primary); }

/* ── Utilities ───────────────────────────────────────────────────────── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border-width: 0;
}
.text-muted { color: var(--muted); }
.mt-0 { margin-top: 0 !important; }