:root{--ink:#13213a;--muted:#61708a;--blue:#1769e0;--blue2:#0f56bc;--sky:#eef5ff;--line:#dfe7f2;--paper:#fff;--soft:#f7f9fc;--green:#0b7a53;--radius:18px;--shadow:0 14px 40px rgba(20,45,80,.08)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font:16px/1.7 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--paper)}
a{color:var(--blue);text-decoration:none}a:hover{text-decoration:underline}.wrap{width:min(1160px,calc(100% - 36px));margin:auto}
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.97);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.navbar{min-height:72px;display:flex;align-items:center;gap:22px}.brand{display:flex;align-items:center;gap:9px;font-weight:850;font-size:21px;color:var(--ink);white-space:nowrap}.brand:hover{text-decoration:none}
.mark{width:34px;height:34px;border:2px solid var(--blue);border-radius:50%;display:grid;place-items:center;color:var(--blue);font-size:17px;transform:rotate(-20deg)}
.navlinks{display:flex;gap:19px;margin-left:auto;align-items:center}.navlinks a{color:#33435e;font-weight:650;font-size:14px}.header-actions{display:flex;align-items:center;gap:10px}.menu{display:none;background:none;border:0;font-size:26px;padding:6px;line-height:1;cursor:pointer}
.btn{display:inline-flex;align-items:center;justify-content:center;padding:11px 17px;border-radius:11px;background:var(--blue);color:#fff!important;font-weight:800;text-decoration:none!important;border:0;white-space:nowrap}.btn:hover{background:var(--blue2)}
.header-cta{font-size:14px;padding:10px 14px}.btn.secondary{background:#fff;color:var(--blue)!important;border:1px solid #b9cff0}
.hero{padding:78px 0 64px;background:linear-gradient(135deg,#f7faff 0%,#eef5ff 65%,#fff 100%);border-bottom:1px solid var(--line)}.hero-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:52px;align-items:center}
.eyebrow{font-size:13px;text-transform:uppercase;letter-spacing:.12em;font-weight:850;color:var(--blue)}h1{font-size:clamp(40px,6vw,66px);line-height:1.03;letter-spacing:-.04em;margin:.2em 0}.lead{font-size:20px;color:var(--muted);max-width:720px}
.hero-card,.card,.decision,.toc,.notice,.compare,.sidebar-card{border:1px solid var(--line);background:#fff;border-radius:var(--radius);box-shadow:var(--shadow)}.hero-card,.card,.sidebar-card{padding:24px}
.ticks{padding:0;list-style:none}.ticks li{padding:8px 0;border-bottom:1px solid var(--line)}.ticks li:before{content:"✓";color:var(--green);font-weight:900;margin-right:9px}
.section{padding:62px 0}.section.soft{background:var(--soft)}.section h2{font-size:34px;line-height:1.15;letter-spacing:-.025em;margin:0 0 14px}.sub{color:var(--muted);max-width:760px;margin-bottom:30px}.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.grid2{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}.card h3{margin:6px 0 8px;line-height:1.25}.card p{color:var(--muted);margin:0 0 12px}
.tag{display:inline-block;font-size:12px;font-weight:850;text-transform:uppercase;letter-spacing:.07em;color:var(--blue);background:var(--sky);padding:5px 8px;border-radius:7px}
.article{padding:46px 0 76px}.article-grid{display:grid;grid-template-columns:minmax(0,780px) 290px;gap:48px}.article h1{font-size:48px}.article h2{font-size:30px;line-height:1.2;margin-top:42px}.article h3{font-size:21px;margin-top:28px}.article p,.article li{color:#33435e}.article .intro{font-size:19px}
.breadcrumbs{font-size:13px;color:var(--muted);margin-bottom:24px}.sidebar{height:max-content}.toc{padding:20px;margin-bottom:18px}.toc strong{display:block;margin-bottom:8px}.toc a{display:block;padding:5px 0;font-size:14px}.sidebar-card h3{margin-top:0}.sidebar-card p{color:var(--muted);font-size:14px}
.notice{padding:16px 18px;background:#fff9e9;border-color:#f0d98c;margin:22px 0}.affiliate{font-size:13px;color:var(--muted);border-left:3px solid var(--blue);padding-left:12px;margin:18px 0}.decision{padding:24px;margin:28px 0;background:var(--sky)}.decision h3{margin-top:0}
.compare{overflow:auto;margin:24px 0}.compare table{width:100%;border-collapse:collapse;min-width:540px}.compare th,.compare td{padding:14px 16px;border-bottom:1px solid var(--line);text-align:left}.compare th{background:var(--soft)}
.cta{padding:28px;border-radius:var(--radius);background:var(--ink);color:#fff;margin:36px 0}.cta h3{margin:0 0 7px;font-size:25px}.cta p{color:#d9e4f5}.cta .btn{background:#4b91f7}
.footer{padding:48px 0;background:#0f1b30;color:#d5deed}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:36px}.footer a{color:#d5deed}.footer small{color:#98a8c2}.footer h4{color:#fff}.listlinks{padding:0;list-style:none}.listlinks li{margin:7px 0}.muted{color:var(--muted)}
.sitemap-list{columns:2;column-gap:36px}.sitemap-list li{break-inside:avoid;margin:8px 0}
@media(max-width:900px){
 .navbar{gap:8px;min-height:66px}.brand{font-size:18px;min-width:0}.mark{width:30px;height:30px}.navlinks{display:none;position:absolute;top:66px;left:0;right:0;background:#fff;padding:18px 24px;border-bottom:1px solid var(--line);flex-direction:column;align-items:flex-start;box-shadow:0 12px 28px rgba(20,45,80,.1)}.navlinks.open{display:flex}
 .header-actions{margin-left:auto;gap:4px}.menu{display:block}.header-cta{font-size:12px;padding:8px 10px}.hero-grid,.article-grid,.grid3,.grid2,.footer-grid{grid-template-columns:1fr}.hero{padding-top:50px}.article h1{font-size:39px}.sitemap-list{columns:1}
}
@media(max-width:430px){.brand .mark{display:none}.brand{font-size:16px}.header-cta{padding:8px 9px}.wrap{width:min(100% - 24px,1160px)}}

.offer-popup[hidden]{display:none}.offer-popup{position:fixed;inset:0;z-index:200;display:grid;place-items:center;padding:20px;background:rgba(8,18,34,.58)}
.offer-popup__panel{position:relative;width:min(520px,100%);background:#fff;border-radius:20px;padding:30px;box-shadow:0 24px 80px rgba(0,0,0,.28)}
.offer-popup__panel h2{font-size:28px;line-height:1.15;margin:0 36px 10px 0}.offer-popup__panel p{color:var(--muted);margin:0 0 22px}.offer-popup__actions{display:flex;gap:10px;flex-wrap:wrap}
.popup-close{position:absolute;right:14px;top:12px;border:0;background:transparent;font-size:30px;line-height:1;color:#53627a;cursor:pointer;padding:5px}
.popup-stay{background:#fff;color:var(--ink)!important;border:1px solid var(--line)}
@media(max-width:900px){
 .navlinks,.menu{display:none!important}
 .navbar{justify-content:space-between}
 .header-actions{margin-left:auto}
 .header-cta{font-size:14px;padding:11px 15px}
 .brand{font-size:18px}
}
@media(max-width:430px){
 .brand{font-size:16px}.header-cta{font-size:13px;padding:10px 12px}
 .offer-popup__panel{padding:25px 20px}.offer-popup__actions{display:grid}.offer-popup__actions .btn{width:100%}
}

/* Desktop library navigation */
.nav-item{position:relative;display:flex;align-items:center}.nav-top{display:block;padding:24px 2px}
.mega-menu{display:none;position:absolute;top:62px;left:-18px;width:300px;padding:18px;background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:0 18px 48px rgba(20,45,80,.14);z-index:80}
.nav-item:hover .mega-menu,.nav-item:focus-within .mega-menu{display:block}.mega-menu strong{display:block;padding:3px 8px 9px;font-size:13px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted)}.mega-menu a{display:block!important;padding:8px;border-radius:8px}.mega-menu a:hover{background:var(--soft);text-decoration:none}
.article-meta{display:flex;gap:10px;flex-wrap:wrap;color:var(--muted);font-size:13px;margin:12px 0 18px}.article-meta span{padding:5px 9px;border:1px solid var(--line);border-radius:999px;background:var(--soft)}
.takeaways{padding:20px 22px;border:1px solid #b9cff0;background:var(--sky);border-radius:14px;margin:22px 0}.takeaways strong{font-size:17px}.takeaways ul{margin-bottom:0}
.cluster-nav{border:1px solid var(--line);border-radius:16px;padding:20px;margin:26px 0;background:#fff}.cluster-nav h2{font-size:23px!important;margin:3px 0 15px!important}.cluster-links{display:grid;grid-template-columns:repeat(2,1fr);gap:8px}.cluster-links a{display:flex;justify-content:space-between;gap:10px;padding:9px 10px;background:var(--soft);border-radius:9px;font-size:14px}.cluster-links small{white-space:nowrap;color:var(--muted)}
.faq{margin-top:42px}.faq details{border-top:1px solid var(--line);padding:15px 0}.faq details:last-child{border-bottom:1px solid var(--line)}.faq summary{font-weight:800;cursor:pointer}.faq details p{margin-bottom:0}
.next-reads{margin:42px 0}.next-reads .card{display:flex;flex-direction:column;gap:8px;box-shadow:none}.next-reads .card span{color:var(--blue);font-size:14px}
.hub-section{padding:34px 0;border-top:1px solid var(--line)}.hub-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.hub-card{border:1px solid var(--line);border-radius:14px;padding:18px;background:#fff}.hub-card small{display:block;color:var(--muted);margin-top:5px}
@media(max-width:900px){.navlinks{display:none!important}.cluster-links,.hub-grid{grid-template-columns:1fr}.article-meta{gap:6px}}