:root{--white:#FFFFFF;--bg:#FAF9F6;--bg-secondary:#F3F1EC;--text-primary:#1A1A1A;--text-secondary:#5C5C5C;--text-muted:#7F7F7F;--border:#ECECEC;--font:'Inter',-apple-system,sans-serif;--radius-md:12px;--radius-lg:16px;--radius-xl:24px;--radius-pill:100px}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--text-primary);background:var(--bg);overflow-x:hidden}
.nav{position:fixed;top:0;left:0;right:0;z-index:1000;background:var(--white);border-bottom:1px solid var(--border)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:56px;max-width:1280px;margin:0 auto;padding:0 24px}
.logo{font-family:'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;font-size:34px;color:var(--text-primary);text-decoration:none}
.nav-links{display:flex;align-items:center;gap:32px;list-style:none}
.nav-links a{font-size:15px;color:var(--text-secondary);text-decoration:none}
.nav-cta{background:var(--text-primary)!important;color:var(--white)!important;padding:10px 24px!important;border-radius:var(--radius-pill);font-size:14px!important;font-weight:600!important}
.burger{display:none;flex-direction:column;gap:5px;background:none;border:none;padding:8px}
.burger span{width:22px;height:2px;background:var(--text-primary)}
@media(max-width:768px){.burger{display:flex}.nav-links{position:fixed;top:56px;left:0;right:0;background:var(--white);flex-direction:column;padding:24px;gap:20px;border-bottom:1px solid var(--border);transform:translateY(-120%);opacity:0;pointer-events:none;transition:all 0.3s}.nav-links.open{transform:translateY(0);opacity:1;pointer-events:all}}
.article-hero{padding:100px 0 40px}
.article-hero .container{max-width:800px;margin:0 auto;padding:0 24px}
.article-back{display:inline-flex;gap:6px;font-size:14px;color:var(--text-muted);text-decoration:none;margin-bottom:24px}
.article-meta{font-size:13px;color:var(--text-muted);margin-bottom:12px}
.article-category{display:inline-block;background:var(--text-primary);color:var(--white);font-size:11px;font-weight:600;letter-spacing:1px;text-transform:uppercase;padding:5px 12px;border-radius:var(--radius-pill);margin-bottom:16px}
.article-hero h1{font-family:'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;font-size:clamp(30px,4.5vw,46px);font-weight:700;letter-spacing:-1.2px;line-height:1.1;margin-bottom:16px}
.article-hero .subtitle{font-size:18px;color:var(--text-secondary);line-height:1.6}
.article-cover{width:100%;max-width:800px;margin:0 auto 40px;padding:0 24px}
.article-cover img{width:100%;border-radius:var(--radius-xl);aspect-ratio:2/1;object-fit:cover;display:block}
.article-layout{max-width:1100px;margin:0 auto;padding:0 24px 80px;display:grid;grid-template-columns:1fr;gap:48px}
@media(min-width:1024px){.article-layout{grid-template-columns:220px 1fr;gap:60px}}
.toc-rail{position:sticky;top:80px;align-self:start;font-size:13.5px}
@media(max-width:1023px){.toc-rail{position:static;background:var(--bg-secondary);border-radius:var(--radius-lg);padding:20px 22px;margin-bottom:24px}}
.toc-rail .toc-label{font-size:11px;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;color:var(--text-muted);margin-bottom:14px}
.toc-rail ol{list-style:none;padding:0;margin:0;border-left:1px solid var(--border)}
.toc-rail ol li a{display:block;padding:7px 0 7px 18px;color:var(--text-secondary);text-decoration:none;border-left:2px solid transparent;margin-left:-1px;line-height:1.4;font-size:13.5px}
.toc-rail ol li a:hover{color:var(--text-primary);border-left-color:var(--text-primary)}
.article-body{max-width:680px;margin:0;padding:0}
.article-body h2{font-family:'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;font-size:26px;font-weight:700;margin:48px 0 16px;line-height:1.2;scroll-margin-top:80px}
.article-body h2:first-child{margin-top:0}
.article-body h3{font-family:'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;font-size:20px;font-weight:700;margin:32px 0 12px}
.article-body p{font-size:16.5px;line-height:1.8;color:var(--text-secondary);margin-bottom:16px}
.article-body ul,.article-body ol{margin:0 0 20px 22px}
.article-body li{font-size:16.5px;line-height:1.8;color:var(--text-secondary);margin-bottom:8px}
.article-body strong{color:var(--text-primary);font-weight:600}
.article-body a{color:var(--text-primary);text-decoration:underline}
.article-body cite{font-style:italic;font-size:14px;color:var(--text-muted)}
.callout{background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-lg);padding:24px 28px;margin:28px 0}
.callout p{margin:0;font-size:15.5px;color:var(--text-primary);line-height:1.7}
.stat-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:12px;margin:28px 0}
.stat-block{background:var(--bg-secondary);padding:20px;border-radius:var(--radius-md)}
.stat-num{font-family:'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;font-size:28px;font-weight:700;color:var(--text-primary);line-height:1.1;margin-bottom:4px}
.stat-label{font-size:12.5px;color:var(--text-secondary);line-height:1.4}
.comparison-table{width:100%;border-collapse:collapse;margin:24px 0;font-size:14px}
.comparison-table th{text-align:left;padding:12px 16px;background:var(--text-primary);color:var(--white);font-weight:600;font-size:13px;text-transform:uppercase}
.comparison-table td{padding:12px 16px;border-bottom:1px solid var(--border);color:var(--text-secondary);vertical-align:top}
.comparison-table td strong{color:var(--text-primary)}
.article-cta{max-width:680px;margin:0 auto 48px;padding:0 24px}
.article-cta-inner{padding:36px;background:var(--text-primary);border-radius:var(--radius-xl);text-align:center;color:var(--white)}
.article-cta-inner h3{font-size:22px;font-weight:700;margin-bottom:8px}
.article-cta-inner p{font-size:15px;color:rgba(255,255,255,0.65);margin-bottom:20px}
.btn{display:inline-flex;padding:14px 32px;border-radius:var(--radius-pill);font-size:15px;font-weight:600;text-decoration:none}
.btn-white{background:var(--white);color:var(--text-primary)}
.related{max-width:800px;margin:0 auto;padding:48px 24px 80px;border-top:1px solid var(--border)}
.related h3{font-size:22px;font-weight:700;margin-bottom:24px}
.related-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px}
.related-card{display:block;padding:20px;background:var(--white);border:1px solid var(--border);border-radius:var(--radius-lg);text-decoration:none;color:var(--text-primary)}
.related-card .rel-label{font-size:10.5px;font-weight:600;letter-spacing:1px;text-transform:uppercase;color:var(--text-muted);margin-bottom:8px}
.related-card h4{font-size:16px;font-weight:700;line-height:1.35}
.footer{background:var(--text-primary);padding:48px 0 24px;color:rgba(255,255,255,0.5)}
.footer .container{max-width:1280px;margin:0 auto;padding:0 24px}
.footer-inner{display:flex;justify-content:space-between;align-items:center}
.footer-brand{font-family:'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;font-size:24px;color:var(--white)}
.footer a{color:rgba(255,255,255,0.4);text-decoration:none;font-size:14px}
.footer-bottom{margin-top:24px;padding-top:16px;border-top:1px solid rgba(255,255,255,0.08);font-size:12px;text-align:center}