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/* SYSTEMS 3.0 1.5: one active view at a time, preserves every section. */
[hidden]{display:none!important}
.top{position:sticky;top:0;z-index:20;background:#06111cf2;backdrop-filter:blur(16px);padding:13px 0}
.top nav{align-items:center;justify-content:center;gap:5px}
.top nav a{padding:9px 11px;border-radius:9px;font-size:13px;white-space:nowrap}
.top nav a[aria-current="page"]{color:#06111c;background:#67deed;font-weight:700}
.top nav a:focus-visible,.menu-toggle:focus-visible{outline:2px solid #67deed;outline-offset:3px}
.menu-toggle{display:none;background:#0d2b3a;border:1px solid #286078;color:#ddf7ff;border-radius:10px;padding:9px 13px;font:inherit;font-weight:650;cursor:pointer}
.section{scroll-margin-top:90px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
@media(max-width:1180px){.top{flex-wrap:wrap;gap:10px}.menu-toggle{display:block;margin-left:auto}.top .clock{margin-left:6px}.top nav{display:none;order:4;flex:0 0 100%;flex-direction:column;align-items:stretch;padding:10px;background:#0a2230;border:1px solid #285369;border-radius:12px}.top nav.is-open{display:flex}.top nav a{font-size:15px;padding:12px 14px}}
@media(max-width:600px){.shell{padding:0 14px}.top{padding:10px 0}.brand b{font-size:20px}.brand small{font-size:8px}.top .clock{font-size:12px}.hero{padding:26px 18px}}