:root{--header-h:64px;--brand-color:#0f1a3a;--blur-strength:8px;--logo-h:50px;--burger-gap:2px;--burger-line:2px}.site-header{position:sticky;top:0;z-index:1000;height:var(--header-h);display:flex;align-items:center;justify-content:space-between;padding:0 20px;background:linear-gradient(to bottom,rgba(0,0,0,0.25),rgba(0,0,0,0));color:var(--brand-color);backdrop-filter:blur(2px)}@media (max-width:640px){.site-header{background:linear-gradient( to bottom,rgba(0,0,0,0.15),rgba(0,0,0,0) );backdrop-filter:blur(2px)}}@media (prefers-color-scheme:dark){.site-header{--brand-color:#ffffff}}html[data-theme="dark"] .site-header{--brand-color:#ffffff}html[data-theme="dark"] .brand img{filter:brightness(0) invert(1)}.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--brand-color);min-height:44px}.brand img,.brand picture{display:block;height:var(--logo-h);width:auto;max-width:200px}.burger{display:inline-flex;flex-direction:column;justify-content:center;align-items:center;width:44px;height:44px;border:0;background:transparent;cursor:pointer}.burger span{display:block;height:var(--burger-line);width:22px;background:var(--brand-color);transition:transform .25s ease,opacity .25s ease,width .25s ease;will-change:transform,opacity,width}.burger span + span{margin-top:var(--burger-gap)}.backdrop[hidden]{display:none !important}.backdrop{position:fixed;inset:0;background:rgba(15,26,58,.28);backdrop-filter:blur(0);opacity:0;pointer-events:none;transition:opacity .35s ease,backdrop-filter .35s ease;z-index:1100}.nav-drawer{position:fixed;top:0;right:0;height:100dvh;width:min(320px,86vw);background:#ffffff;box-shadow:-10px 0 30px rgba(0,0,0,.12);transform:translateX(100%);transition:transform .35s ease;z-index:1200;display:flex;flex-direction:column;padding:calc(16px + env(safe-area-inset-top))}.nav-drawer nav a{display:block;padding:12px 10px;color:#17154c;text-decoration:none;font-family:Arial,Helvetica,sans-serif;font-size:18px;border-radius:10px;transition:color .2s ease,background-color .2s ease,transform .2s ease}.nav-drawer nav a:hover,.nav-drawer nav a:focus-visible{background-color:#f3f4f6;color:var(--brand-color);transform:translateX(4px)}html.nav-open .nav-drawer{transform:translateX(0%)}html.nav-open .backdrop{opacity:1;backdrop-filter:blur(var(--blur-strength));pointer-events:auto}html.nav-open .burger span:nth-child(1){transform:translateY(calc(var(--burger-line) + var(--burger-gap))) rotate(45deg)}html.nav-open .burger span:nth-child(2){opacity:0}html.nav-open .burger span:nth-child(3){transform:translateY(calc(-1 * (var(--burger-line) + var(--burger-gap)))) rotate(-45deg)}@media (prefers-reduced-motion:reduce){.backdrop,.nav-drawer,.burger span{transition:none !important}}.nav-drawer nav a.ar-locked{color:#9a4b00;background:rgba(154,75,0,0.06);cursor:not-allowed;font-variant-numeric:tabular-nums;pointer-events:none}