@font-face{font-family:"IBM Plex Sans";font-weight:400;font-display:swap;src:url(/app/fonts/IBMPlexSans-Regular.woff2) format("woff2")}
@font-face{font-family:"IBM Plex Sans";font-weight:600;font-display:swap;src:url(/app/fonts/IBMPlexSans-SemiBold.woff2) format("woff2")}
@font-face{font-family:"IBM Plex Sans";font-weight:700;font-display:swap;src:url(/app/fonts/IBMPlexSans-Bold.woff2) format("woff2")}
:root{--bg:#F3F5F8;--c:#fff;--ch:#EEF1F5;--ink:#111820;--muted:#5A6572;--line:#DCE2E9;--primary:#1F6F8B;--on:#fff}
@media(prefers-color-scheme:dark){:root{--bg:#0B0F14;--c:#151B23;--ch:#1B222C;--ink:#E7EDF4;--muted:#93A0AF;--line:#28313C;--primary:#6FC3E0;--on:#042230}}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.7 "IBM Plex Sans",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
a{color:var(--primary)}.wrap{max-width:1080px;margin:0 auto;padding:0 20px}.row{display:flex;align-items:center;gap:16px}
h1{font-size:clamp(1.9rem,4vw,2.8rem);line-height:1.15;letter-spacing:-.02em;margin:.6em 0 .3em}h2{font-size:1.45rem;margin:1.6em 0 .4em;letter-spacing:-.01em}h3{margin:1.2em 0 .3em}
header.top{position:sticky;top:0;z-index:5;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
header.top .row{height:64px}.brand{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--ink);text-decoration:none;font-size:1.1rem}.brand img{border-radius:9px}
nav.main{display:flex;gap:4px;margin-left:auto}nav.main a{padding:6px 12px;border-radius:99px;color:var(--muted);text-decoration:none;font-weight:600;font-size:.95rem}nav.main a.on,nav.main a:hover{color:var(--ink);background:var(--ch)}
@media(max-width:760px){nav.main{display:none}header.top .btn{margin-left:auto}}
.btn{display:inline-flex;align-items:center;gap:8px;padding:.6rem 1.1rem;border-radius:99px;font-weight:600;text-decoration:none;border:1px solid var(--line);color:var(--primary);white-space:nowrap}
.btn.primary{background:var(--primary);color:var(--on);border-color:transparent}
.hero{background:linear-gradient(135deg,#0E1B27,#14394B);color:#fff;border-radius:28px;padding:44px 36px;margin:28px 0;display:grid;grid-template-columns:1.2fr 1fr;gap:28px;align-items:center}
.hero h1{margin-top:0;color:#fff}.hero p{color:#CFE6F2;font-size:1.1rem}.hero .btn{border-color:rgba(255,255,255,.4);color:#fff}.hero .btn.primary{background:#6FC3E0;color:#042230}
.hero img{width:100%;max-width:340px;justify-self:center;border-radius:20px}@media(max-width:860px){.hero{grid-template-columns:1fr;padding:30px 22px}}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;margin:16px 0}
.card{background:var(--c);border-radius:20px;padding:20px;border:1px solid var(--line)}.card h3{margin-top:0}.card p{margin:.3em 0;color:var(--muted);font-size:.97rem}
a.card{text-decoration:none;color:inherit;display:block;transition:transform .12s}a.card:hover{transform:translateY(-2px)}
.tag{display:inline-block;font-size:.75rem;font-weight:600;padding:1px 10px;border-radius:99px;background:var(--ch);color:var(--muted);margin-right:6px}
article{max-width:760px}article p,article li,article dd{color:var(--ink)}.lead{font-size:1.15rem;color:var(--muted)}
dl dt{font-weight:700;margin-top:1em}dl dd{margin-left:0}.formula{font-family:"IBM Plex Mono",monospace;background:var(--ch);padding:12px 16px;border-radius:12px}
.moves{list-style:none;padding:0}.moves li{padding:10px 0;border-bottom:1px solid var(--line)}.moves b{font-family:"IBM Plex Mono",monospace;margin-right:8px}
.diagram{margin:18px 0;display:inline-block}.diagram svg{border-radius:10px;max-width:100%;height:auto;display:block}.diagram figcaption{font-size:.9rem;color:var(--muted);text-align:center;margin-top:6px}
.diagrams{display:flex;flex-wrap:wrap;gap:18px}.diagrams .diagram{width:min(320px,100%)}
details{background:var(--ch);border-radius:12px;padding:10px 14px;margin:8px 0}summary{cursor:pointer;font-weight:600}
.cta{background:var(--c);border:1px solid var(--line);border-radius:20px;padding:20px;margin:28px 0;display:flex;gap:16px;align-items:center;flex-wrap:wrap;justify-content:space-between}
.crumbs{font-size:.88rem;color:var(--muted);margin-top:18px}.crumbs a{color:var(--muted)}
.small{font-size:.88rem;color:var(--muted)}.faq h3{font-size:1.05rem}
footer{border-top:1px solid var(--line);margin-top:60px;padding:30px 0 20px;background:var(--c)}footer .cols{display:grid;grid-template-columns:2fr 1fr 1fr;gap:24px}
footer .cols div{display:flex;flex-direction:column;gap:6px}footer a{color:var(--muted);text-decoration:none}footer .btn{align-self:flex-start;color:var(--primary)}
@media(max-width:760px){footer .cols{grid-template-columns:1fr}}