.header{z-index:20;padding:1rem 0;transition:transform .2s;position:sticky;top:0}.header-visible{transform:translateY(0)}.header-hidden{transform:translateY(-130%)}.header-top{width:100%}.container{width:min(1120px,92vw);margin:0 auto}.header-top-content{justify-content:center;padding-left:410px;padding-right:410px;display:flex}.nav-shell{border:1px solid var(--surface-border);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);background:var(--surface-bg);border-radius:18px;flex-direction:column;gap:0;width:100%;max-width:920px;padding:.85rem 1rem;transition:border-radius .2s,gap .2s;display:flex}.nav-shell-open{border-radius:24px;gap:.75rem}.nav-shell-header{justify-content:space-between;align-items:center;gap:1.5rem;display:flex}.nav-logo-mark{color:inherit;align-items:center;gap:.75rem;text-decoration:none;display:inline-flex}.nav-logo-icon{border:1px solid var(--surface-border);background:var(--logo-bg);border-radius:50%;justify-content:center;align-items:center;width:2.1rem;height:2.1rem;font-size:.82rem;font-weight:700;transition:transform .2s;display:inline-flex}.nav-logo-clicked{transform:scale(.94)}.nav-logo-text{letter-spacing:.02em;font-weight:700}.nav-menu-toggle{border:1px solid var(--surface-border);color:inherit;cursor:pointer;background:0 0;border-radius:999px;align-items:center;gap:.5rem;padding:.38rem .65rem;display:inline-flex}.nav-menu-label{font-size:.85rem}.nav-menu-icon{flex-direction:column;gap:3px;display:inline-flex}.nav-menu-icon span{background:currentColor;width:14px;height:1px;transition:transform .2s}.nav-menu-icon-open span:first-child{transform:translateY(2px)rotate(45deg)}.nav-menu-icon-open span:last-child{transform:translateY(-2px)rotate(-45deg)}.nav-menu{opacity:0;max-height:0;padding-top:0;transition:max-height .22s ease-in-out,opacity .18s ease-in-out,padding-top .18s ease-in-out;overflow:hidden}.nav-menu-open{opacity:1;max-height:480px;padding-top:.25rem}.nav-menu-closed{padding-top:0}.nav-menu-list-wrapper{grid-template-columns:1fr 1fr;gap:1rem;display:grid}.nav-menu-list{gap:.4rem;margin:0;padding:0;list-style:none;display:grid}.nav-menu-link{width:100%;color:inherit;text-align:left;opacity:0;background:0 0;border:1px solid #0000;border-radius:10px;padding:.38rem .55rem;text-decoration:none;transition:opacity .2s,transform .2s,border-color .2s;display:inline-block;transform:translate(16px)}.nav-menu-open .nav-menu-link{opacity:1;transform:translate(0)}.nav-menu-link:hover{border-color:var(--surface-border)}.nav-menu-link-inner{height:1.2rem;display:block;overflow:hidden}.nav-menu-link-line{line-height:1.2rem;display:block}.nav-menu-link-line-duplicate{color:var(--text-soft)}.theme-toggle-in-menu{cursor:pointer;align-items:center;gap:.5rem;display:inline-flex}.theme-toggle-in-menu input{display:none}.theme-toggle-track{border:1px solid var(--surface-border);border-radius:999px;width:2rem;height:1.1rem;padding:1px}.theme-toggle-thumb{background:var(--text-main);border-radius:50%;width:.85rem;height:.85rem;transition:transform .2s;display:block}.theme-toggle-in-menu input:checked+.theme-toggle-label-text+.theme-toggle-track .theme-toggle-thumb{transform:translate(.85rem)}@media (max-width:760px){.nav-menu-list-wrapper{grid-template-columns:1fr}}