/* ==============================================
   BLOG POST DARK THEME — SCOPED STYLES
   css/blog-post-dark.css
   Extracted from blog-post-1/2/3.html internal <style> blocks
   Dark purple theme; uses --c-* custom properties
   ============================================== */

:root {
  --c-primary: #4f46e5;
  --c-primary-d: #3730a3;
  --c-primary-l: #818cf8;
  --c-accent: #10b981;
  --c-accent-d: #059669;
  --c-gold: #f59e0b;
  --c-dark: #06080f;
  --c-dark-2: #0d1117;
  --c-dark-3: #111827;
  --c-text: #e2e8f0;
  --c-muted: #94a3b8;
  --c-border: rgba(255,255,255,.08);
  --c-card: rgba(255,255,255,.04);
  --c-card-h: rgba(255,255,255,.07);
  --radius-sm: .5rem;
  --radius: .875rem;
  --radius-lg: 1.25rem;
  --shadow: 0 4px 24px rgba(0,0,0,.35);
  --shadow-lg: 0 8px 48px rgba(0,0,0,.5);
  --transition: all 0.25s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { font-family: 'Inter', system-ui, sans-serif; background: var(--c-dark); color: var(--c-text); line-height: 1.7; overflow-x: hidden; }

.skip-nav { position: absolute; top: -100%; left: 0; background: var(--c-primary); color: #fff; padding: .75rem 1.5rem; z-index: 9999; font-weight: 700; font-size: .875rem; border-radius: 0 0 8px 0; transition: top .2s; }
.skip-nav:focus { top: 0; }

h1, h2, h3, h4, h5 { font-family: 'Sora', sans-serif; line-height: 1.2; }
h1 { font-size: clamp(1.9rem, 4vw, 2.75rem); font-weight: 800; letter-spacing: -.02em; }
h2 { font-size: clamp(1.35rem, 2.8vw, 1.85rem); font-weight: 700; letter-spacing: -.015em; }
h3 { font-size: clamp(1.05rem, 2vw, 1.25rem); font-weight: 700; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }

/* ── Post hero ── */
.post-hero { background: linear-gradient(145deg, #06080f 0%, #0c0f1f 40%, #0d1117 100%); padding: 7.5rem 0 3.5rem; border-bottom: 1px solid var(--c-border); position: relative; overflow: hidden; }
.post-hero::before { content: ''; position: absolute; inset: 0; background: radial-gradient(ellipse 65% 55% at 80% 40%, rgba(79,70,229,.13) 0%, transparent 70%); pointer-events: none; }
.post-hero-inner { position: relative; max-width: 820px; }
.breadcrumb { display: flex; align-items: center; gap: .45rem; font-size: .78rem; color: var(--c-muted); margin-bottom: 1.25rem; flex-wrap: wrap; }
.breadcrumb a { color: var(--c-muted); transition: color .2s; }
.breadcrumb a:hover { color: var(--c-primary-l); }
.breadcrumb-sep { color: #334155; }
.post-cat-badge { display: inline-flex; align-items: center; gap: .4rem; background: rgba(79,70,229,.15); border: 1px solid rgba(79,70,229,.35); color: var(--c-primary-l); font-size: .72rem; font-weight: 700; padding: .25rem .8rem; border-radius: 99px; text-transform: uppercase; letter-spacing: .06em; margin-bottom: .9rem; }
.post-hero h1 { margin-bottom: 1rem; }
.post-hero-meta { display: flex; flex-wrap: wrap; gap: .65rem 1.5rem; margin-top: 1.25rem; font-size: .8rem; color: #64748b; }
.post-hero-meta span { display: flex; align-items: center; gap: .4rem; }
.post-hero-meta i { color: var(--c-primary-l); font-size: .7rem; }
.author-chip { display: flex; align-items: center; gap: .55rem; }
.author-av { width: 30px; height: 30px; border-radius: 50%; background: linear-gradient(135deg, var(--c-primary), var(--c-primary-d)); display: flex; align-items: center; justify-content: center; font-size: .65rem; font-weight: 800; color: #fff; flex-shrink: 0; }
.post-tags-row { display: flex; flex-wrap: wrap; gap: .4rem; margin-top: 1rem; }
.tag { font-size: .68rem; font-weight: 600; padding: .18rem .6rem; border-radius: 99px; border: 1px solid; letter-spacing: .03em; }
.tag-indigo { color: var(--c-primary-l); border-color: rgba(79,70,229,.35); background: rgba(79,70,229,.08); }
.tag-green  { color: #34d399; border-color: rgba(52,211,153,.3); background: rgba(52,211,153,.07); }
.tag-gold   { color: #fbbf24; border-color: rgba(251,191,36,.3); background: rgba(251,191,36,.07); }

/* ── Article layout ── */
.article-layout { display: grid; grid-template-columns: 1fr 300px; gap: 3rem; padding: 3rem 0 5rem; align-items: start; }
@media(max-width:960px) { .article-layout { grid-template-columns: 1fr; } }

/* ── Article body ── */
.article-body { min-width: 0; }
.article-body p { color: #cbd5e1; line-height: 1.85; margin-bottom: 1.35rem; font-size: .975rem; }
.article-body h2 { color: #fff; margin: 2.5rem 0 1rem; padding-top: .5rem; border-top: 1px solid var(--c-border); }
.article-body h2:first-of-type { border-top: none; margin-top: 0; }
.article-body h3 { color: #e2e8f0; margin: 1.75rem 0 .75rem; }
.article-body h4 { color: var(--c-primary-l); font-size: .95rem; font-weight: 700; margin: 1.25rem 0 .5rem; font-family: 'Sora', sans-serif; }
.article-body ul, .article-body ol { padding-left: 1.4rem; margin-bottom: 1.35rem; color: #cbd5e1; font-size: .975rem; }
.article-body li { margin-bottom: .5rem; line-height: 1.75; }
.article-body a { color: var(--c-primary-l); text-decoration: underline; text-decoration-color: rgba(129,140,248,.35); text-underline-offset: 3px; transition: color .2s, text-decoration-color .2s; }
.article-body a:hover { color: #fff; text-decoration-color: rgba(129,140,248,.7); }
.article-body strong { color: #e2e8f0; font-weight: 600; }
.article-body em { color: var(--c-gold); font-style: italic; }

/* Key takeaway box */
.key-box { background: rgba(79,70,229,.1); border: 1px solid rgba(79,70,229,.3); border-left: 4px solid var(--c-primary); border-radius: .875rem; padding: 1.25rem 1.5rem; margin: 1.75rem 0; }
.key-box-title { font-size: .72rem; font-weight: 800; text-transform: uppercase; letter-spacing: .1em; color: var(--c-primary-l); margin-bottom: .5rem; display: flex; align-items: center; gap: .4rem; }
.key-box p { margin: 0; font-size: .92rem; color: #c7d2fe; }

/* Info box */
.info-box { background: rgba(16,185,129,.08); border: 1px solid rgba(16,185,129,.25); border-left: 4px solid var(--c-accent); border-radius: .875rem; padding: 1.25rem 1.5rem; margin: 1.75rem 0; }
.info-box-title { font-size: .72rem; font-weight: 800; text-transform: uppercase; letter-spacing: .1em; color: #34d399; margin-bottom: .5rem; display: flex; align-items: center; gap: .4rem; }
.info-box p { margin: 0; font-size: .92rem; color: #a7f3d0; }

/* Warning box */
.warn-box { background: rgba(245,158,11,.07); border: 1px solid rgba(245,158,11,.25); border-left: 4px solid var(--c-gold); border-radius: .875rem; padding: 1.25rem 1.5rem; margin: 1.75rem 0; }
.warn-box-title { font-size: .72rem; font-weight: 800; text-transform: uppercase; letter-spacing: .1em; color: #fbbf24; margin-bottom: .5rem; display: flex; align-items: center; gap: .4rem; }
.warn-box p { margin: 0; font-size: .92rem; color: #fde68a; }

/* Comparison table */
.comp-table-wrap { overflow-x: auto; margin: 1.75rem 0; border-radius: .875rem; border: 1px solid var(--c-border); }
table { width: 100%; border-collapse: collapse; font-size: .88rem; }
thead { background: rgba(79,70,229,.2); }
thead th { padding: .85rem 1rem; text-align: left; font-family: 'Sora', sans-serif; font-weight: 700; font-size: .8rem; text-transform: uppercase; letter-spacing: .06em; color: var(--c-primary-l); white-space: nowrap; }
thead th:first-child { color: var(--c-muted); }
tbody tr { border-top: 1px solid var(--c-border); transition: background .15s; }
tbody tr:hover { background: rgba(255,255,255,.03); }
tbody td { padding: .85rem 1rem; color: #cbd5e1; vertical-align: top; }
tbody td:first-child { font-weight: 600; color: #e2e8f0; white-space: nowrap; }
.tc-good { color: #34d399; }
.tc-warn { color: #fbbf24; }
.tc-bad  { color: #f87171; }

/* Plan diagram */
.plan-diagram { background: var(--c-card); border: 1px solid var(--c-border); border-radius: 1rem; padding: 1.75rem; margin: 1.75rem 0; text-align: center; }
.plan-diagram-title { font-size: .72rem; font-weight: 800; text-transform: uppercase; letter-spacing: .1em; color: var(--c-muted); margin-bottom: 1.25rem; }
.diagram-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
@media(max-width:500px) { .diagram-grid { grid-template-columns: 1fr; } }
.diag-box { background: var(--c-dark-3); border: 1px solid var(--c-border); border-radius: .75rem; padding: 1.25rem; }
.diag-box h4 { font-size: .9rem; margin-bottom: 1rem; display: flex; align-items: center; gap: .5rem; }
.diag-tree { display: flex; flex-direction: column; align-items: center; gap: .5rem; font-size: .75rem; }
.diag-node { background: rgba(79,70,229,.2); border: 1px solid rgba(79,70,229,.4); border-radius: .5rem; padding: .35rem .85rem; font-weight: 600; color: var(--c-primary-l); white-space: nowrap; }
.diag-node.sponsor { background: linear-gradient(135deg, var(--c-primary), var(--c-primary-d)); border-color: transparent; color: #fff; }
.diag-node.green { background: rgba(16,185,129,.2); border-color: rgba(16,185,129,.4); color: #34d399; }
.diag-row { display: flex; gap: .5rem; justify-content: center; flex-wrap: wrap; }
.diag-connector { width: 1px; height: 20px; background: var(--c-border); margin: 0 auto; }
.diag-connector-h { display: flex; align-items: center; gap: .25rem; }
.diag-connector-h::before, .diag-connector-h::after { content: ''; flex: 1; height: 1px; background: var(--c-border); }

/* Pros/Cons */
.pros-cons-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; margin: 1.75rem 0; }
@media(max-width:560px) { .pros-cons-grid { grid-template-columns: 1fr; } }
.pros-box, .cons-box { background: var(--c-card); border: 1px solid var(--c-border); border-radius: .875rem; padding: 1.25rem; }
.pros-box { border-top: 3px solid var(--c-accent); }
.cons-box { border-top: 3px solid #f43f5e; }
.pros-cons-title { font-size: .78rem; font-weight: 800; text-transform: uppercase; letter-spacing: .08em; margin-bottom: .85rem; display: flex; align-items: center; gap: .4rem; }
.pros-cons-title.good { color: #34d399; }
.pros-cons-title.bad  { color: #f87171; }
.pros-box ul, .cons-box ul { list-style: none; padding: 0; margin: 0; }
.pros-box li, .cons-box li { font-size: .85rem; padding: .4rem 0; border-bottom: 1px solid var(--c-border); display: flex; align-items: flex-start; gap: .5rem; color: #cbd5e1; }
.pros-box li:last-child, .cons-box li:last-child { border-bottom: none; }
.pros-box li::before { content: '\f00c'; font-family: 'Font Awesome 6 Free'; font-weight: 900; color: var(--c-accent); font-size: .72rem; margin-top: .28rem; flex-shrink: 0; }
.cons-box li::before { content: '\f00d'; font-family: 'Font Awesome 6 Free'; font-weight: 900; color: #f87171; font-size: .72rem; margin-top: .28rem; flex-shrink: 0; }

/* Decision framework */
.decision-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; margin: 1.75rem 0; }
@media(max-width:560px) { .decision-grid { grid-template-columns: 1fr; } }
.decision-card { background: var(--c-card); border: 1px solid var(--c-border); border-radius: .875rem; padding: 1.4rem; }
.decision-card.binary   { border-top: 3px solid var(--c-primary); }
.decision-card.unilevel { border-top: 3px solid var(--c-accent); }
.decision-card h4 { margin-bottom: .85rem; display: flex; align-items: center; gap: .5rem; font-size: .92rem; }
.decision-card h4 i { font-size: .9rem; }
.decision-card ul { list-style: none; padding: 0; margin: 0; }
.decision-card li { font-size: .82rem; padding: .35rem 0; border-bottom: 1px solid var(--c-border); color: #cbd5e1; display: flex; gap: .5rem; align-items: flex-start; }
.decision-card li:last-child { border-bottom: none; }
.decision-card li i { color: var(--c-primary-l); font-size: .72rem; margin-top: .3rem; flex-shrink: 0; }
.decision-card.unilevel li i { color: #34d399; }

/* Stats highlight */
.stats-row { display: grid; grid-template-columns: repeat(3,1fr); gap: 1rem; margin: 1.75rem 0; }
@media(max-width:500px) { .stats-row { grid-template-columns: 1fr 1fr; } }
.stat-highlight { background: var(--c-card); border: 1px solid var(--c-border); border-radius: .875rem; padding: 1.1rem; text-align: center; }
.stat-highlight .val { font-size: 1.6rem; font-weight: 800; font-family: 'Sora', sans-serif; background: linear-gradient(135deg, #fff, var(--c-primary-l)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; line-height: 1.1; margin-bottom: .25rem; }
.stat-highlight .lbl { font-size: .72rem; color: var(--c-muted); line-height: 1.4; }

/* Share bar */
.share-bar { display: flex; align-items: center; gap: .75rem; flex-wrap: wrap; padding: 1.25rem 0; border-top: 1px solid var(--c-border); border-bottom: 1px solid var(--c-border); margin: 2.5rem 0; }
.share-bar-label { font-size: .75rem; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--c-muted); }
.share-btn { display: inline-flex; align-items: center; gap: .4rem; padding: .45rem 1rem; border-radius: .6rem; font-size: .78rem; font-weight: 600; transition: var(--transition); border: 1px solid var(--c-border); color: var(--c-muted); }
.share-btn:hover { transform: translateY(-2px); }
.share-btn.tw:hover { border-color: #1d9bf0; color: #1d9bf0; background: rgba(29,155,240,.08); }
.share-btn.li:hover { border-color: #0a66c2; color: #0a66c2; background: rgba(10,102,194,.08); }
.share-btn.wa:hover { border-color: #25d366; color: #25d366; background: rgba(37,211,102,.08); }
.share-btn.cp:hover { border-color: var(--c-primary-l); color: var(--c-primary-l); background: rgba(79,70,229,.08); }

/* Author bio */
.author-bio { background: var(--c-card); border: 1px solid var(--c-border); border-radius: 1rem; padding: 1.5rem; display: flex; gap: 1.25rem; align-items: flex-start; margin: 2rem 0; }
.author-avatar-lg { width: 58px; height: 58px; border-radius: 50%; background: linear-gradient(135deg, var(--c-primary), var(--c-primary-d)); display: flex; align-items: center; justify-content: center; font-size: 1.1rem; font-weight: 800; color: #fff; flex-shrink: 0; font-family: 'Sora', sans-serif; }
.author-bio-content h4 { font-size: .95rem; margin-bottom: .25rem; }
.author-bio-content p { font-size: .82rem; color: var(--c-muted); margin: 0; line-height: 1.6; }

/* Related posts */
.related-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; margin-top: 1.25rem; }
@media(max-width:500px) { .related-grid { grid-template-columns: 1fr; } }
.related-card { background: var(--c-card); border: 1px solid var(--c-border); border-radius: .875rem; padding: 1.25rem; transition: var(--transition); }
.related-card:hover { background: var(--c-card-h); border-color: rgba(79,70,229,.35); transform: translateY(-3px); }
.related-card .rc-cat { font-size: .68rem; font-weight: 700; text-transform: uppercase; letter-spacing: .07em; color: var(--c-primary-l); margin-bottom: .5rem; }
.related-card h4 { font-size: .88rem; line-height: 1.4; margin-bottom: .5rem; }
.related-card h4 a { transition: color .2s; }
.related-card h4 a:hover { color: var(--c-primary-l); }
.related-card p { font-size: .78rem; color: var(--c-muted); line-height: 1.55; }

/* Sidebar */
.sidebar { display: flex; flex-direction: column; gap: 1.5rem; position: sticky; top: 5.5rem; }
.sidebar-card { background: var(--c-card); border: 1px solid var(--c-border); border-radius: 1rem; padding: 1.4rem; }
.sidebar-title { font-size: .72rem; font-weight: 800; text-transform: uppercase; letter-spacing: .1em; color: var(--c-muted); margin-bottom: 1rem; display: flex; align-items: center; gap: .5rem; }
.sidebar-title i { color: var(--c-primary-l); }
.toc-list { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: .25rem; }
.toc-list li a { display: block; padding: .4rem .65rem; border-radius: .5rem; font-size: .82rem; color: #64748b; transition: var(--transition); border-left: 2px solid transparent; }
.toc-list li a:hover, .toc-list li a.active { color: var(--c-primary-l); background: rgba(79,70,229,.08); border-left-color: var(--c-primary-l); }
.toc-list li a.sub { padding-left: 1.25rem; font-size: .77rem; }
.sidebar-links { display: flex; flex-direction: column; gap: .4rem; }
.sidebar-link { display: flex; align-items: center; gap: .65rem; padding: .55rem .7rem; border-radius: .5rem; font-size: .83rem; color: var(--c-muted); transition: var(--transition); }
.sidebar-link:hover { background: rgba(79,70,229,.1); color: #fff; padding-left: .95rem; }
.sidebar-link i { color: var(--c-primary-l); font-size: .78rem; width: 16px; text-align: center; flex-shrink: 0; }
.cta-sidebar { background: linear-gradient(135deg, rgba(79,70,229,.15), rgba(16,185,129,.1)); border: 1px solid rgba(79,70,229,.3); border-radius: 1rem; padding: 1.5rem; text-align: center; }
.cta-sidebar h3 { font-size: 1rem; margin-bottom: .45rem; }
.cta-sidebar p { font-size: .8rem; color: var(--c-muted); margin-bottom: 1rem; }
.btn-cta-s { display: block; padding: .65rem 1.1rem; background: linear-gradient(135deg, var(--c-primary), var(--c-primary-d)); color: #fff; border-radius: .7rem; font-weight: 700; font-size: .83rem; text-align: center; transition: var(--transition); margin-bottom: .5rem; }
.btn-cta-s:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(79,70,229,.4); }
.btn-cta-s.outline { background: transparent; border: 1px solid rgba(255,255,255,.12); color: var(--c-muted); }
.btn-cta-s.outline:hover { border-color: rgba(79,70,229,.5); color: #fff; background: rgba(79,70,229,.1); }

/* Progress bar */
.reading-progress { position: fixed; top: 0; left: 0; height: 3px; background: linear-gradient(90deg, var(--c-primary), var(--c-primary-l)); width: 0%; z-index: 9999; transition: width .1s linear; }

/* Footer */
footer { background: var(--c-dark-2); border-top: 1px solid var(--c-border); padding: 2.5rem 0 1.5rem; }
.footer-simple { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 1rem; }
.footer-logo-r { display: flex; align-items: center; gap: .65rem; }
.footer-logo-icon-r { width: 32px; height: 32px; border-radius: .5rem; background: linear-gradient(135deg, var(--c-primary), var(--c-primary-d)); display: flex; align-items: center; justify-content: center; color: #fff; font-size: .85rem; }
.footer-logo-text-r { font-family: 'Sora', sans-serif; font-weight: 700; font-size: .88rem; color: #fff; }
.footer-links-r { display: flex; gap: 1.25rem; flex-wrap: wrap; }
.footer-links-r a { font-size: .78rem; color: #475569; transition: color .2s; }
.footer-links-r a:hover { color: var(--c-primary-l); }
.footer-copy { width: 100%; text-align: center; font-size: .72rem; color: #334155; margin-top: 1.25rem; padding-top: 1rem; border-top: 1px solid var(--c-border); }

/* Sticky mobile bar */
.sticky-mobile-bar { display: none; position: fixed; bottom: 0; left: 0; right: 0; z-index: 980; background: rgba(13,17,23,.97); border-top: 1px solid var(--c-border); backdrop-filter: blur(12px); padding: .5rem .75rem; gap: .5rem; }
@media(max-width:640px) { .sticky-mobile-bar { display: flex; } }
.smb-call, .smb-demo, .smb-wa { flex: 1; display: flex; align-items: center; justify-content: center; gap: .4rem; padding: .65rem .4rem; border-radius: .625rem; font-size: .78rem; font-weight: 700; transition: var(--transition); }
.smb-call { background: rgba(255,255,255,.06); color: var(--c-text); border: 1px solid var(--c-border); }
.smb-demo { background: linear-gradient(135deg, var(--c-primary), var(--c-primary-d)); color: #fff; }
.smb-wa   { background: rgba(37,211,102,.12); color: #25d366; border: 1px solid rgba(37,211,102,.25); }

#btt { position: fixed; bottom: 5rem; right: 1.25rem; width: 40px; height: 40px; border-radius: 50%; background: var(--c-primary); color: #fff; border: none; cursor: pointer; display: flex; align-items: center; justify-content: center; font-size: .85rem; opacity: 0; transform: translateY(12px); transition: opacity .3s, transform .3s; z-index: 900; box-shadow: 0 4px 14px rgba(79,70,229,.4); }
#btt.show { opacity: 1; transform: none; }
@media(min-width:641px) { #btt { bottom: 1.5rem; } }