:root{--bg:#f4f7fb;--surface:#fff;--ink:#0b1733;--text:#26364d;--muted:#64748b;--line:#dbe3ef;--primary:#3157d5;--primary2:#7c3aed;--green:#08775c;--red:#b42318;--max:1160px;--shadow:0 10px 30px rgba(15,31,65,.08)}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}img,svg{display:block;max-width:100%;height:auto}button,input,select,textarea{font:inherit}.container{width:min(var(--max),calc(100% - 44px));margin-inline:auto}.small,.v21-meta,.meta,.breadcrumbs{color:var(--muted);font-size:.9rem}.breadcrumbs{margin-bottom:10px}.breadcrumbs a,.article-v21 a{color:#284ebc;text-decoration:underline;text-underline-offset:3px}
h1,h2,h3{overflow-wrap:break-word}h1{font-family:Georgia,"Times New Roman",serif;letter-spacing:-.045em}h2{font-size:clamp(1.7rem,3.2vw,2.45rem);line-height:1.15;letter-spacing:-.025em}h3{line-height:1.3}
.topbar{background:#07142e;color:#d9e4fb;font-size:.78rem}.topbar .container{min-height:34px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.96);border-bottom:1px solid var(--line);box-shadow:0 4px 18px rgba(15,31,65,.04)}.nav{min-height:72px;display:flex;align-items:center;gap:24px}.brand{display:inline-flex;align-items:center;flex:0 0 auto}.brand img{width:168px;aspect-ratio:35/8;object-fit:contain}.primary-nav{display:flex;align-items:center;gap:20px;margin-left:auto}.primary-nav a{font-size:.9rem;font-weight:750;color:#344054;white-space:nowrap}.primary-nav a:hover{color:var(--primary)}.nav-cta{padding:9px 13px;color:#fff!important;border-radius:11px;background:linear-gradient(135deg,var(--primary),var(--primary2))}.menu-toggle{display:none;width:44px;height:44px;padding:0;border:1px solid var(--line);border-radius:13px;background:#fff;color:var(--ink)}.menu-toggle span,.menu-toggle::before,.menu-toggle::after{content:"";display:block;width:20px;height:2px;margin:5px auto;background:currentColor;border-radius:99px}.menu-toggle[aria-expanded="true"] span{opacity:0}.menu-toggle[aria-expanded="true"]::before{transform:translateY(7px) rotate(45deg)}.menu-toggle[aria-expanded="true"]::after{transform:translateY(-7px) rotate(-45deg)}
.v21-header{background:linear-gradient(135deg,#07142e,#152b59);color:#fff;padding:clamp(44px,7vw,82px) 0;border-bottom:5px solid #4f74ef}.v21-header h1{max-width:930px;margin:14px 0;font-size:clamp(2.45rem,7vw,5.15rem);line-height:.98}.v21-header p{max-width:760px;margin:0;color:#d9e4fb;font-size:clamp(1.03rem,2vw,1.24rem);line-height:1.7}.v21-badge,.tag,.eyebrow{display:inline-flex;padding:7px 11px;border-radius:999px;font-size:.78rem;font-weight:800}.v21-badge{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.16)}.tag,.eyebrow{background:#eaf1ff;color:#28489e}.v21-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:25px}.btn{display:inline-flex;align-items:center;justify-content:center;padding:12px 18px;border:0;border-radius:12px;background:linear-gradient(135deg,var(--primary),var(--primary2));color:#fff!important;font-weight:800;text-decoration:none!important}.btn.secondary{background:transparent;border:1px solid rgba(255,255,255,.34)}
.v21-proof{position:relative;z-index:2;display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:-28px}.v21-proof div{padding:20px;border:1px solid var(--line);background:#fff;border-radius:18px;box-shadow:var(--shadow)}.v21-proof strong{display:block;margin-bottom:5px}.v21-proof span{color:var(--muted);font-size:.9rem}
.v21-section{padding:clamp(40px,5vw,66px) 0;border-bottom:1px solid var(--line)}.v21-section.alt{background:#eaf0f8}.v21-section h2{margin:.25rem 0 .65rem}.v21-intro{max-width:720px;color:var(--text)}.v21-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin-top:24px}.v21-card{display:block;padding:25px;border:1px solid var(--line);border-radius:20px;background:#fff;box-shadow:0 8px 24px rgba(15,31,65,.055)}.v21-card:hover{border-color:#9aace0;box-shadow:var(--shadow)}.v21-card h3{margin:12px 0 8px;font-size:1.3rem}.v21-card p{margin:0;color:var(--text)}.source-link{display:inline-block;margin-top:14px;color:#284ebc;font-weight:800}.v21-tool{padding:clamp(22px,4vw,36px);border:1px solid var(--line);border-radius:22px;background:#fff;box-shadow:var(--shadow)}
.page-wrap{padding:clamp(28px,5vw,52px) 0}.article-v21{max-width:920px;margin:0 auto;padding:clamp(24px,5vw,50px);background:#fff;border:1px solid var(--line);border-radius:24px;box-shadow:0 9px 30px rgba(15,31,65,.065)}.article-v21 h1{font-size:clamp(2.3rem,6vw,4.35rem);line-height:1.02;margin:.5rem 0 1rem}.article-v21 h2{margin-top:2.1rem;padding-top:1rem;border-top:1px solid var(--line);font-size:clamp(1.4rem,3vw,1.95rem)}.article-v21 h3{margin-top:1.4rem}.article-v21 p,.article-v21 li{color:var(--text);font-size:1.01rem;line-height:1.8}.article-v21 li{margin:.4rem 0}.v21-summary,.v21-stop,.v21-caution{padding:18px 20px;border-left:5px solid var(--primary);border-radius:14px;background:#eaf1ff}.v21-stop{border-color:var(--red);background:#fff1f0;color:#7a271a}.v21-caution{border-color:#d97706;background:#fff8e8;color:#713b00}.v21-byline{display:flex;gap:12px;align-items:center;padding:16px 0;border-block:1px solid var(--line);margin:20px 0}.v21-byline strong{display:block}.v21-byline span{color:var(--muted);font-size:.9rem}.v21-sources{margin-top:30px;padding:20px;border:1px solid var(--line);border-radius:16px;background:#f8fafc}.v21-sources h2{border:0;padding:0;margin:0 0 10px;font-size:1.25rem}
.v21-table-wrap{overflow-x:auto}.v21-table{width:100%;border-collapse:collapse;margin:20px 0}.v21-table th,.v21-table td{padding:13px;text-align:left;vertical-align:top;border:1px solid var(--line)}.v21-table th{background:#edf3fb}.v21-check{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin:18px 0}.v21-check label{display:flex;align-items:flex-start;gap:10px;padding:14px;border:1px solid var(--line);border-radius:13px;background:#fbfdff}.v21-check input{margin-top:4px;width:18px;height:18px}.v21-progress{height:12px;overflow:hidden;background:#e4eaf3;border-radius:99px}.v21-progress span{display:block;width:0;height:100%;background:linear-gradient(90deg,var(--primary),var(--green));transition:.2s}.v21-score{font-weight:850!important;color:var(--green)!important}
.diagnostic{display:grid;grid-template-columns:minmax(230px,.7fr) minmax(0,1.3fr);gap:18px;margin-top:18px}.diagnostic-panel,.diagnostic-result{padding:20px;border:1px solid var(--line);border-radius:16px;background:#f8fafc}.diagnostic-panel label{display:block;margin-bottom:10px}.diagnostic-panel select{width:100%;padding:12px;border:1px solid #b9c5d8;border-radius:10px;background:#fff;color:var(--ink)}.diagnostic-result h2{margin:.7rem 0}.diagnostic-result h3{margin:1.2rem 0 .35rem;font-size:1.05rem}.diagnostic-result ul,.diagnostic-result ol{padding-left:22px}.check-list li{margin:.35rem 0;color:var(--text)}.severity{display:inline-flex;padding:6px 10px;border-radius:999px;background:#fff1f0;color:#9b2c23;font-size:.77rem;font-weight:850}.danger{margin-top:18px;padding:14px;border-left:4px solid var(--red);border-radius:10px;background:#fff1f0;color:#7a271a}.empty-state{color:var(--muted)}
.ad-slot{min-height:0}.ad-slot:empty{display:none}.site-footer{margin-top:38px;color:#cbd5e1;background:#09111f}.site-footer::before{content:"";display:block;height:4px;background:linear-gradient(90deg,var(--primary),#06b6d4,var(--primary2))}.footer-main{padding:46px 0 32px}.footer-grid{display:grid;grid-template-columns:minmax(250px,1.8fr) repeat(3,minmax(120px,1fr));gap:32px}.footer-brand img{width:166px}.footer-brand p{max-width:420px;color:#aeb9cc}.site-footer h3{margin:0 0 12px;color:#fff;font:800 .94rem/1.4 Inter,ui-sans-serif,system-ui,sans-serif;letter-spacing:.01em}.site-footer a{display:block;width:max-content;max-width:100%;margin:7px 0;color:#cbd5e1;font-size:.89rem}.footer-bottom{border-top:1px solid rgba(255,255,255,.09)}.footer-bottom .container{min-height:60px;display:flex;align-items:center;justify-content:space-between;gap:20px;color:#94a3b8;font-size:.82rem}.footer-bottom-links{display:flex;gap:18px;flex-wrap:wrap}.footer-bottom-links a{margin:0;color:#94a3b8}
@media(min-width:761px){main>.v21-section{content-visibility:auto;contain-intrinsic-size:700px}}
@media(max-width:900px){.primary-nav{gap:12px}.footer-grid{grid-template-columns:1.4fr repeat(3,1fr);gap:22px}}
@media(max-width:760px){.container{width:calc(100% - 28px)}.topbar{display:none}.nav{min-height:66px;gap:10px}.brand img{width:142px}.menu-toggle{display:block;margin-left:auto}.primary-nav{position:absolute;left:14px;right:14px;top:calc(100% + 7px);display:none;flex-direction:column;align-items:stretch;gap:0;padding:10px;border:1px solid var(--line);border-radius:17px;background:#fff;box-shadow:0 18px 50px rgba(15,31,65,.18)}.primary-nav.open{display:flex}.primary-nav a{padding:11px 12px;border-radius:9px}.nav-cta{margin-top:5px;text-align:center}.v21-header{padding:38px 0}.v21-header h1{font-size:clamp(2.6rem,12.5vw,3.85rem)}.v21-actions{display:grid}.v21-actions .btn{width:100%}.v21-proof,.v21-grid,.v21-check,.diagnostic{grid-template-columns:1fr}.v21-proof{margin-top:18px}.article-v21{padding:23px 18px;border-radius:18px}.v21-table th,.v21-table td{min-width:145px;padding:10px}.footer-grid{grid-template-columns:1fr 1fr;gap:26px 20px}.footer-brand{grid-column:1/-1}.footer-bottom .container{padding:16px 0;min-height:0;align-items:flex-start;flex-direction:column}.footer-main{padding:34px 0 24px}}
@media(max-width:420px){.container{width:calc(100% - 24px)}.brand img{width:132px}.footer-grid{grid-template-columns:1fr}.footer-brand{grid-column:auto}}