@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@500&family=IBM+Plex+Sans:wght@400;500;600&family=Source+Serif+4:opsz,wght@8..60,600&display=swap');
:root{--ink:#0B1B33;--blue:#1D4ED8;--blue-dark:#1E3A8A;--bg:#F5F7FA;--soft:#EDF1F6;--card:#FFFFFF;--line:#DCE1E8;--muted:#4B5563;--text:#1F2937;--allow:#1F5673;--hold:#8A5A0B;--block:#9B2C2C;--light:#C9D1D9;--r:12px}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:'IBM Plex Sans',Helvetica,Arial,sans-serif;font-size:17px;line-height:1.6}
img{max-width:100%;height:auto}a{color:var(--blue)}a:hover{color:var(--blue-dark)}
.wrap{max-width:1200px;margin:0 auto;padding:0 28px}
h1,h2{font-family:'Source Serif 4',Georgia,serif;font-weight:600;color:var(--ink);line-height:1.12;margin:0 0 16px}
h1{font-size:clamp(36px,5vw,58px)}h2{font-size:clamp(28px,3.4vw,42px)}
h3{font-size:21px;line-height:1.3;color:var(--ink);margin:0 0 8px;font-weight:600}
p{margin:0 0 14px}.lead{font-size:19px;color:#334155;max-width:640px}
.eyebrow{font-family:'IBM Plex Mono',monospace;font-size:13px;letter-spacing:2px;text-transform:uppercase;color:var(--muted);margin-bottom:12px}
.eyebrow.light{color:#AEB8C2}.mono{font-family:'IBM Plex Mono',monospace}
section{padding:88px 0}section.soft{background:var(--soft)}section.dark{background:var(--ink);color:var(--light)}
section.dark h2,section.dark h3{color:#F5F7FA}
.section-head{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:end;margin-bottom:40px}.section-head p{color:var(--muted);margin:0}
section.dark .section-head p{color:#9FB0C4}
/* nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(245,247,250,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav .inner{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand img{height:34px;display:block}
.desktop-nav{display:flex;align-items:center;gap:26px;font-size:15px}
.desktop-nav>a{color:var(--ink);text-decoration:none}.desktop-nav>a:hover{color:var(--blue)}
.product-menu{position:relative}.product-menu summary{cursor:pointer;list-style:none;color:var(--ink)}.product-menu summary::-webkit-details-marker{display:none}
.product-menu summary::after{content:" ▾";font-size:12px}
.drop{position:absolute;top:36px;left:-16px;width:320px;background:#fff;border:1px solid var(--line);border-radius:var(--r);box-shadow:0 16px 40px rgba(11,27,51,.12);padding:8px}
.drop a{display:block;padding:12px 14px;border-radius:8px;text-decoration:none;color:var(--ink)}.drop a:hover{background:var(--soft)}
.drop strong{display:block;font-weight:600}.drop span{font-size:14px;color:var(--muted)}
.drop .tag{display:inline-block;margin-left:6px;font-family:'IBM Plex Mono',monospace;font-size:11px;color:#0B6B43;background:#E3F4EA;padding:1px 6px;border-radius:4px}
.btn{display:inline-block;background:var(--blue);color:#fff!important;text-decoration:none;padding:14px 22px;border-radius:8px;font-weight:500;border:1px solid var(--blue)}
.btn:hover{background:var(--blue-dark)}.btn.small{padding:9px 16px;font-size:14px}
.btn.alt{background:transparent;color:var(--ink)!important;border-color:var(--ink)}.btn.alt:hover{background:#fff}
.btn.light{background:#fff;color:var(--ink)!important;border-color:#fff}
.mobile-toggle{display:none;background:none;border:1px solid var(--line);border-radius:8px;font-size:20px;padding:4px 10px;cursor:pointer}
.mobile-panel{display:none;flex-direction:column;padding:10px 28px 20px;border-top:1px solid var(--line)}
.mobile-panel a{padding:10px 0;color:var(--ink);text-decoration:none;border-bottom:1px solid var(--line)}.mobile-panel a.sub{padding-left:16px}
.nav.open .mobile-panel{display:flex}
/* hero */
.hero{padding:88px 0 80px}.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:center}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:28px}
.slogan{font-family:'IBM Plex Mono',monospace;color:var(--blue);font-size:15px;letter-spacing:1px;margin-top:22px}
.decision-card{background:var(--ink);color:#F5F7FA;border-radius:16px;padding:26px 28px;box-shadow:0 30px 60px rgba(11,27,51,.2)}
.decision-card .req{background:#16294A;border-radius:10px;padding:14px 16px;margin-bottom:18px}
.decision-card .req small{font-family:'IBM Plex Mono',monospace;font-size:12px;color:#AEB8C2}
.decision-card .row{display:flex;justify-content:space-between;gap:16px;padding:10px 0;border-bottom:1px solid #22385A;font-size:16px}
.decision-card .v{font-family:'IBM Plex Mono',monospace;color:#6B7785;white-space:nowrap}
.v.yes{color:#8FC1DA}.v.unk{color:#F2B96B}
.verdict{margin-top:18px;border-radius:8px;padding:12px 16px;font-family:'IBM Plex Mono',monospace;letter-spacing:1px;text-align:center;background:#22385A;color:#AEB8C2;transition:background .3s}
.verdict.hold{background:var(--hold);color:#fff}.verdict.ok{background:var(--allow);color:#fff}
.verdict-note{font-size:14px;color:#AEB8C2;text-align:center;margin-top:10px;min-height:44px}
/* cards */
.grid2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.grid3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px}.grid4{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:22px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:28px;transition:transform .2s,box-shadow .2s}
.card:hover{transform:translateY(-3px);box-shadow:0 12px 28px rgba(11,27,51,.08)}
.card p{color:var(--muted);margin:0}.card .num{font-family:'IBM Plex Mono',monospace;font-size:13px;color:var(--muted);margin-bottom:10px}
.card.dark{background:var(--ink);border-color:var(--ink)}.card.dark h3{color:#F5F7FA}.card.dark p{color:var(--light)}
.lane{padding:34px}.lane h3{font-size:26px}.lane .links{display:flex;flex-direction:column;gap:10px;margin-top:18px}
.lane .links a{font-weight:500;text-decoration:none}
.badge{display:inline-block;font-family:'IBM Plex Mono',monospace;font-size:12px;padding:3px 10px;border-radius:5px;letter-spacing:1px}
.badge.now{background:#E3F4EA;color:#0B6B43}.badge.allow{background:var(--allow);color:#fff}.badge.hold{background:var(--hold);color:#fff}.badge.block{background:var(--block);color:#fff}
.q{border-top:3px solid var(--ink);padding-top:20px}.q.accent{border-top-color:var(--blue)}
.q .num{font-family:'IBM Plex Mono',monospace;color:var(--muted);font-size:14px}
.q p{color:var(--muted)}
.callout{margin-top:32px;background:#fff;border-left:5px solid var(--blue);padding:20px 24px;border-radius:6px}
.callout strong{color:var(--ink)}
/* tabs */
.tabs{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:24px}
.tab{cursor:pointer;font-family:'IBM Plex Mono',monospace;font-size:14px;letter-spacing:1px;padding:10px 16px;border-radius:8px;border:1px solid #3B4A5A;background:transparent;color:var(--light)}
.tab.active{background:#F5F7FA;color:var(--ink);border-color:#F5F7FA}
section:not(.dark) .tab{border-color:var(--line);color:var(--ink)}section:not(.dark) .tab.active{background:var(--ink);color:#fff;border-color:var(--ink)}
.panel{display:none}.panel.active{display:block}
.steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}
.stepbox{background:#16294A;border-radius:10px;padding:20px;opacity:0;transform:translateY(8px);animation:rise .5s ease forwards}
.stepbox small{font-family:'IBM Plex Mono',monospace;color:#AEB8C2;font-size:12px}.stepbox p{margin:6px 0 0;color:#F5F7FA}
.stepbox.warn p{color:#F2B96B}.stepbox.good p{color:#8FC1DA}
.panel .result{font-family:'Source Serif 4',Georgia,serif;font-size:30px;margin-top:22px;opacity:0;animation:rise .5s ease forwards}
@keyframes rise{to{opacity:1;transform:none}}
/* path diagram */
.path{display:flex;align-items:center;gap:14px;margin-top:16px;font-size:15px}
.node{border:1px solid var(--ink);border-radius:8px;padding:9px 14px;white-space:nowrap;background:#fff}
.node.core{background:var(--ink);color:#fff;border-color:var(--ink)}.node.ghost{border-style:dashed;color:var(--muted);background:transparent}
.line{position:relative;flex:1;height:2px;background:#9AA5B1}.line.dashed{background:none;border-top:2px dashed #9AA5B1}
.pk{position:absolute;top:-6px;width:14px;height:14px;border-radius:50%;background:var(--blue);animation:travel 2.6s linear infinite}.pk.d2{animation-delay:1.3s}
.bounce{position:absolute;top:-8px;width:14px;height:14px;border-radius:50%;background:var(--hold);animation:bounce 2.8s ease-in-out infinite}
.nokey{position:absolute;left:46%;top:-26px;font-family:'IBM Plex Mono',monospace;font-size:13px;color:var(--hold)}
@keyframes travel{0%{left:0;opacity:0}10%{opacity:1}90%{opacity:1}100%{left:calc(100% - 14px);opacity:0}}
@keyframes bounce{0%{left:0;opacity:0}10%{opacity:1}55%{left:44%}70%{left:38%}100%{left:38%;opacity:0}}
/* table */
.tablewrap{overflow-x:auto}table.cmp{width:100%;border-collapse:collapse;background:#fff;border-radius:var(--r);overflow:hidden;font-size:15px}
.cmp th,.cmp td{padding:14px 16px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.cmp th{background:var(--ink);color:#fff;font-weight:500}.cmp td.h{color:var(--ink);font-weight:600;background:#F0F5FF}
.stack{display:flex;flex-direction:column}.stack .layer{background:#fff;border:1px solid var(--line);padding:20px 24px}
.stack .layer:first-child{border-radius:10px 10px 0 0}.stack .layer.h{background:var(--ink);color:#fff;border-color:var(--ink);border-radius:0 0 10px 10px}
.stack .layer small{font-family:'IBM Plex Mono',monospace;color:var(--muted)}.stack .layer.h small{color:#AEB8C2}
.stack .layer p{margin:4px 0 0;font-size:19px}
ul.clean{margin:10px 0 0;padding-left:20px;color:var(--muted)}ul.clean li{margin:6px 0}
.card.dark ul.clean{color:var(--light)}
/* masking example */
.mask{display:grid;grid-template-columns:1fr 1fr;gap:18px}.mask pre{white-space:pre-wrap;font-family:'IBM Plex Mono',monospace;font-size:14px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:18px;margin:0;min-height:120px}
.mask h4{margin:0 0 8px;font-size:14px;color:var(--muted);font-weight:500}.pm{background:#E0E9FF;color:var(--blue-dark);border-radius:4px;padding:0 4px}
/* cta + footer */
.cta{background:var(--blue);color:#fff;padding:72px 0}.cta .inner{display:flex;justify-content:space-between;align-items:center;gap:40px}
.cta h2{color:#fff}.cta p{color:#E0E9FF;max-width:720px;margin:0}
.footer{background:var(--ink);color:var(--light);padding:56px 0 28px;font-size:15px}
.foot{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px}.foot h4{color:#fff;margin:0 0 12px;font-size:15px}
.foot a{display:block;color:var(--light);text-decoration:none;margin:6px 0}.foot a:hover{color:#fff}
.foot img{height:32px;filter:brightness(0) invert(1)}
.legal{display:flex;justify-content:space-between;gap:20px;border-top:1px solid #22385A;margin-top:36px;padding-top:20px;font-size:14px;color:#91A2B7;flex-wrap:wrap}
.note{font-size:14px;color:var(--muted)}
@media (max-width:980px){.desktop-nav>a,.product-menu,.desktop-nav .btn{display:none}.mobile-toggle{display:block}
.hero-grid,.section-head,.grid2,.grid3,.grid4,.steps,.mask,.foot{grid-template-columns:1fr}.cta .inner{flex-direction:column;align-items:flex-start}.path{flex-wrap:wrap}.line{min-width:40px}section{padding:64px 0}}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}.stepbox,.panel .result{opacity:1;transform:none}html{scroll-behavior:auto}}
/* v1.1 additions: masking product + guides */
.chips{display:flex;gap:10px;flex-wrap:wrap;margin-top:18px}.chip{font-size:14px;border:1px solid var(--line);background:#fff;border-radius:999px;padding:6px 14px;color:var(--ink)}
.flow{display:grid;grid-template-columns:1fr auto 1fr auto 1fr;gap:14px;align-items:stretch}
.flow .box{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px}.flow .box.vpc{border:2px solid var(--blue)}
.flow .box small{font-family:'IBM Plex Mono',monospace;color:var(--muted);font-size:12px}.flow .box strong{display:block;color:var(--ink);margin:4px 0}
.flow .box p{margin:0;font-size:15px;color:var(--muted)}.flow .arr{align-self:center;font-size:22px;color:var(--muted)}
.vpcwrap{border:2px dashed #9DB5F5;border-radius:16px;padding:18px;background:#F4F7FF}.vpcwrap>.eyebrow{color:var(--blue)}
.check{list-style:none;padding:0;margin:0}.check li{padding:14px 0 14px 34px;border-bottom:1px solid var(--line);position:relative}
.check li::before{content:"✓";position:absolute;left:4px;top:13px;color:var(--blue);font-weight:600}.check li strong{color:var(--ink);display:block}
section.dark .check li{border-color:#22385A}section.dark .check li strong{color:#F5F7FA}
.guide{max-width:820px}.guide h2{margin-top:40px}.guide h3{margin-top:26px}.guide p,.guide li{color:#334155}
ol.steps-list{padding-left:22px}ol.steps-list li{margin:10px 0}
.faq details{background:#fff;border:1px solid var(--line);border-radius:10px;padding:16px 20px;margin-bottom:12px}
.faq summary{cursor:pointer;font-weight:600;color:var(--ink)}.faq details p{margin:10px 0 0;color:var(--muted)}
.email-note{font-size:14px;color:#E0E9FF;margin-top:10px}.email-note.dark{color:var(--muted)}
.split{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.boundary{display:grid;grid-template-columns:1fr auto 1fr;gap:16px;align-items:center}
.boundary .side{background:#fff;border:1px solid var(--line);border-radius:12px;padding:22px}.boundary .side.cust{border:2px solid var(--blue)}
.boundary ul{margin:8px 0 0;padding-left:18px;color:var(--muted)}.boundary .mid{font-family:'IBM Plex Mono',monospace;text-align:center;color:var(--blue);font-size:13px}
@media (max-width:980px){.flow,.split,.boundary{grid-template-columns:1fr}.flow .arr{transform:rotate(90deg);justify-self:center}}