:root{--ink:#0b1220;--navy:#0f172a;--muted:#55657a;--line:#dfe7f1;--surface:#f4f8fe;--blue:#1677ff;--link:#1d4ed8;--display:'Crimson Pro',Georgia,serif;--body:'Inter',system-ui,-apple-system,'Segoe UI',sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;font-family:var(--body);color:var(--ink);background:#fff;line-height:1.65;font-size:17px}
img{max-width:100%;display:block}a{color:var(--link)}
.wrap{width:min(1100px,calc(100% - 32px));margin-inline:auto}
.narrow{width:min(780px,calc(100% - 32px));margin-inline:auto}
.skip{position:fixed;left:16px;top:-80px;z-index:99;background:#fff;color:#111827;padding:10px 14px;border-radius:12px}.skip:focus{top:16px}
.top{background:var(--navy);color:#fff;position:sticky;top:0;z-index:20}
.nav{display:flex;align-items:center;gap:20px;min-height:64px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;color:#fff;text-decoration:none;font-weight:800;font-size:18px}
.brand img{width:38px;height:38px;border-radius:50%}
.nav-links{display:flex;gap:18px;margin-left:auto;flex-wrap:wrap}
.nav-links a{color:#cfdbea;text-decoration:none;font-size:15px}.nav-links a:hover,.nav-links a[aria-current]{color:#fff}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:0 22px;border-radius:14px;font-weight:800;text-decoration:none;border:0;cursor:pointer;font:inherit;font-weight:800}
.btn-wa{background:linear-gradient(135deg,#16a34a,#22c55e);color:#fff;box-shadow:0 14px 30px rgba(22,163,74,.22)}
.btn-ghost{background:#eef5ff;color:#124da5}
.btn-sm{min-height:40px;padding:0 16px;font-size:15px}
.hero{background:radial-gradient(1200px 500px at 80% -10%,#1e3a8a 0,transparent 60%),var(--navy);color:#fff;padding:56px 0 64px}
.crumbs{font-size:14px;color:#9fb2c8;margin-bottom:18px}.crumbs a{color:#cfdbea}
.eyebrow{font:700 12px/1 'IBM Plex Mono',monospace;letter-spacing:.14em;text-transform:uppercase;color:#7cc4ff}
h1{font:600 clamp(36px,5.4vw,58px)/1.04 var(--display);letter-spacing:-.02em;margin:10px 0 16px}
.hero p.lead{font-size:19px;color:#cfdbea;max-width:62ch;margin:0 0 26px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap}
main section{padding:56px 0}
main section.alt{background:var(--surface)}
h2{font:600 clamp(28px,3.6vw,40px)/1.12 var(--display);margin:0 0 14px;letter-spacing:-.01em}
h3{font-size:19px;margin:22px 0 6px;line-height:1.35}
p{margin:0 0 14px}.muted{color:var(--muted)}
ul.check{list-style:none;padding:0;margin:0;display:grid;gap:10px}
ul.check li{padding-left:30px;position:relative}
ul.check li::before{content:'';position:absolute;left:0;top:6px;width:18px;height:18px;border-radius:6px;background:#dbeafe url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M5 10.5l3 3 7-7' fill='none' stroke='%231d4ed8' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/14px no-repeat}
.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:18px}
.card{background:#fff;border:1px solid var(--line);border-radius:22px;padding:24px}
.card h3{margin-top:0}
.steps{counter-reset:s;display:grid;gap:14px;padding:0;list-style:none}
.steps li{counter-increment:s;padding:18px 18px 18px 66px;position:relative;background:#fff;border:1px solid var(--line);border-radius:18px}
.steps li::before{content:counter(s);position:absolute;left:18px;top:16px;width:34px;height:34px;border-radius:50%;background:var(--navy);color:#fff;display:grid;place-items:center;font-weight:800}
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:18px;background:#fff}
table{border-collapse:collapse;width:100%;min-width:620px;font-size:15.5px}
th,td{text-align:left;padding:12px 14px;border-bottom:1px solid var(--line);vertical-align:top}
th{background:#eef4fc;font-size:14px;text-transform:uppercase;letter-spacing:.04em;color:#334155}
tr:last-child td{border-bottom:0}
.formula{font:500 20px/1.5 'IBM Plex Mono',ui-monospace,monospace;background:#0f172a;color:#e2e8f0;border-radius:16px;padding:18px 20px;overflow-x:auto;margin:10px 0 16px}
.note{background:#fff7ed;border:1px solid #fed7aa;border-radius:16px;padding:14px 16px;color:#7c2d12;font-size:15.5px}
details{background:#fff;border:1px solid var(--line);border-radius:16px;padding:14px 18px;margin-bottom:10px}
summary{font-weight:700;cursor:pointer}details p{margin:10px 0 0}
.cta{background:var(--navy);color:#fff;border-radius:26px;padding:34px;display:flex;gap:20px;align-items:center;justify-content:space-between;flex-wrap:wrap}
.cta h2{color:#fff;margin:0 0 6px}.cta p{color:#cfdbea;margin:0}
.calc{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:22px}
.field{display:grid;gap:6px;margin-bottom:14px}
.field label{font-weight:700;font-size:15px}
.field input,.field select,.field textarea{font:inherit;padding:11px 12px;border:1px solid #c7d4e4;border-radius:12px;background:#fff;color:var(--ink);width:100%}
.field small{color:var(--muted);font-size:13.5px}
.result{background:var(--navy);color:#fff;border-radius:22px;padding:24px}
.result .big{font:600 64px/1 var(--display);margin:6px 0}
.result .row{display:flex;justify-content:space-between;gap:12px;border-top:1px solid rgba(255,255,255,.12);padding:9px 0;font-size:15px;color:#cfdbea}
.result .row b{color:#fff}
.strata-out td:last-child,.strata-out th:last-child{text-align:right}
.author{display:flex;gap:14px;align-items:center;margin-top:18px;color:#cfdbea;font-size:15px}
.author img{width:44px;height:44px;border-radius:50%}
.post-list{display:grid;gap:16px}
.post-list a.card{text-decoration:none;color:inherit;display:block}.post-list a.card:hover{border-color:#93c5fd}
article.prose h2{margin-top:34px}
:focus-visible{outline:3px solid #2563eb;outline-offset:3px;border-radius:6px}
footer{background:#0b1220;color:#9fb2c8;padding:28px 0;font-size:15px}
footer .row{display:flex;gap:14px 22px;flex-wrap:wrap;align-items:center}
footer a{color:#cfdbea;text-decoration:none}
@media (max-width:820px){.grid2,.grid3,.calc{grid-template-columns:1fr}.nav-links{order:3;width:100%;margin-left:0;gap:14px;padding-bottom:10px;overflow-x:auto;flex-wrap:nowrap}.nav .btn{margin-left:auto}main section{padding:42px 0}.cta{padding:26px}}