:root{--ink:#10243f;--blue:#2457c5;--green:#168f63;--paper:#f7f9fc;--line:#dce5ef;--muted:#5d6b7d;--white:#fff;--amber:#f5b82e;--font:'Manrope',sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--font);line-height:1.72}a{color:inherit}.container{width:min(1120px,calc(100% - 40px));margin:auto}.header{position:sticky;top:0;z-index:20;border-bottom:1px solid var(--line);background:rgba(255,255,255,.94)}.nav{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:24px}.logo{display:flex;align-items:center;gap:11px;text-decoration:none;font-weight:900}.logo img{width:44px;height:44px}.nav-links{display:flex;gap:24px;margin:0;padding:0;list-style:none;font-weight:750}.nav-links a{text-decoration:none}.hero{padding:76px 0 58px;background:linear-gradient(135deg,#eef5ff,#fff 52%,#eef8f4)}.eyebrow{color:var(--green);font-size:.82rem;font-weight:900;letter-spacing:.08em;text-transform:uppercase}.hero h1{max-width:900px;margin:12px 0 20px;font-size:clamp(2.25rem,5vw,4.4rem);line-height:1.04;letter-spacing:-.045em}.hero p{max-width:780px;margin:0;color:var(--muted);font-size:clamp(1.05rem,2vw,1.25rem)}.meta{margin-top:22px;color:var(--muted);font-size:.9rem}.layout{display:grid;grid-template-columns:minmax(0,760px) 280px;gap:52px;align-items:start;padding:58px 0 84px}.article{min-width:0}.article h2{margin:44px 0 14px;font-size:clamp(1.55rem,3vw,2.2rem);line-height:1.18;letter-spacing:-.025em}.article h3{margin:28px 0 10px;font-size:1.2rem}.article p,.article li{font-size:1.04rem}.article ul,.article ol{padding-left:1.35rem}.article li+li{margin-top:9px}.callout{margin:30px 0;padding:24px 26px;border-left:5px solid var(--green);border-radius:0 16px 16px 0;background:#eaf7f2;font-weight:720}.checklist{display:grid;gap:12px;margin:25px 0}.check{padding:17px 18px;border:1px solid var(--line);border-radius:14px;background:var(--white)}.check strong{display:block;margin-bottom:3px}.table-wrap{overflow-x:auto;margin:28px 0}table{width:100%;border-collapse:collapse;background:var(--white)}th,td{padding:15px;border:1px solid var(--line);text-align:left;vertical-align:top}th{background:#edf3fb}.sidebar{position:sticky;top:94px;padding:24px;border:1px solid var(--line);border-radius:20px;background:var(--white)}.sidebar h2{margin:0 0 12px;font-size:1.2rem}.sidebar a{display:block;margin-top:10px;color:var(--blue);font-weight:750}.cta{margin-top:48px;padding:34px;border-radius:24px;background:var(--ink);color:var(--white)}.cta h2{margin:0 0 10px;color:var(--white)}.cta p{color:#d8e2ee}.button{display:inline-flex;margin-top:12px;padding:14px 20px;border-radius:12px;background:var(--amber);color:var(--ink);font-weight:900;text-decoration:none}.related{margin-top:42px;padding-top:28px;border-top:1px solid var(--line)}.related a{color:var(--blue);font-weight:800}.footer{padding:28px 0;border-top:1px solid var(--line);background:var(--white);color:var(--muted);font-size:.9rem}.footer .container{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}.footer a{color:var(--blue)}@media(max-width:800px){.container{width:min(100% - 28px,720px)}.nav{min-height:64px}.nav-links a:not(:last-child){display:none}.hero{padding:48px 0 40px}.layout{grid-template-columns:1fr;gap:34px;padding:38px 0 60px}.sidebar{position:static;order:-1}.article p,.article li{font-size:1rem}.cta{padding:25px 21px}th,td{min-width:150px;padding:12px;font-size:.92rem}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

/* Shared Alfa Chess shell */
.header .hamburger{display:none;width:42px;height:42px;padding:9px;border:0;background:transparent}.header .hamburger span{display:block;height:2px;margin:5px 0;background:#10243f}.header .nav-mobile{display:none}.footer{padding:64px 0 24px;background:#10243f;color:#fff}.footer>.container{display:block;width:min(1344px,calc(100% - 96px));max-width:none}.footer-grid{display:grid;grid-template-columns:1.35fr repeat(3,1fr);gap:48px}.footer .logo{color:#fff}.footer .logo-text{color:#fff;font-size:1.35rem}.footer h4{margin:0 0 18px;color:#fff;font-size:1rem}.footer ul{margin:0;padding:0;list-style:none}.footer li+li{margin-top:10px}.footer a{color:rgba(255,255,255,.72);text-decoration:none}.footer a:hover{color:#f5b82e}.footer-bottom{margin-top:44px;padding-top:22px;border-top:1px solid rgba(255,255,255,.14);color:rgba(255,255,255,.58)}.footer-bottom p{margin:0}@media(max-width:1023px){.header .hamburger{display:block}.header .nav-mobile.is-open{display:block;position:absolute;top:72px;left:0;width:100%;padding:12px 24px 20px;background:#fff;border-bottom:1px solid #e3e9f1;box-shadow:0 16px 28px rgba(16,36,63,.1)}.header .nav-mobile-links{margin:0;padding:0;list-style:none}.header .nav-mobile-links a{display:block;padding:12px;color:#10243f;font-weight:800;text-decoration:none}.footer-grid{grid-template-columns:1fr 1fr}}@media(max-width:767px){.footer{padding-top:44px}.footer>.container{width:calc(100% - 32px)}.footer-grid{grid-template-columns:1fr;gap:30px}.footer-bottom{margin-top:30px}}

.header .header-cta{text-decoration:none!important}.header .nav-mobile{display:none}


.move-diagram{margin:22px 0 38px;padding:18px;border:1px solid var(--line);border-radius:0;background:#fff;box-shadow:0 14px 38px rgba(16,36,63,.07)}
.move-diagram img{display:block;width:100%;height:auto;border-radius:0;background:#fff}
.move-diagram figcaption{margin-top:14px;color:var(--muted);font-size:.94rem;font-weight:700;line-height:1.5}
@media(min-width:700px){.move-diagram{max-width:620px}}
@media(max-width:800px){.move-diagram{margin:18px 0 30px;padding:10px;border-radius:0}.move-diagram figcaption{padding:0 4px 4px;font-size:.9rem}}