.modern-header{height:var(--header-height);background:var(--surface);border-bottom:1px solid var(--border);display:grid;grid-template-columns:240px minmax(600px,1fr) 245px;align-items:stretch;position:sticky;top:0;z-index:50}.modern-brand{display:flex;align-items:center;padding-left:22px;text-decoration:none}.modern-brand>span{font-size:26px;font-weight:var(--weight-bold);letter-spacing:-1.8px;color:var(--primary)}.modern-brand>span>span{color:#212529}.modern-brand em{font-size:12px;letter-spacing:0;color:var(--primary);font-style:normal}.modern-header nav{display:flex;justify-content:center;height:100%}.modern-header nav a{min-width:84px;padding:10px 8px 7px;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:5px;text-decoration:none;color:#273444;border-bottom:2px solid transparent}.modern-header nav a:hover,.modern-header nav a.active{background:var(--primary-soft);color:var(--primary);border-color:var(--primary)}.modern-header nav img{width:20px;height:20px}.modern-account{display:flex;align-items:center;justify-content:flex-end;gap:8px;padding-right:18px}.modern-account a,.modern-account button{height:42px;border:1px solid var(--border);border-radius:var(--radius-md);background:#fff;display:grid;place-items:center;padding:0 16px;text-decoration:none;font-weight:var(--weight-bold)}.modern-account .join{background:var(--primary);border-color:var(--primary);color:#fff}.modern-account img{width:18px}.shell{max-width:var(--content-max);margin:0 auto;padding:16px;display:grid;grid-template-columns:var(--left-width) minmax(0,1fr) var(--right-width);gap:14px}.content-column{min-width:0}.sidebar-left,.sidebar-right{display:flex;flex-direction:column;gap:12px;align-self:start}.modern-footer{background:#fff;border-top:1px solid var(--border);display:grid;grid-template-columns:repeat(5,minmax(140px,1fr)) auto;gap:18px;align-items:center;padding:14px 28px}.modern-footer>div{display:flex;gap:9px;align-items:center}.modern-footer i{width:29px;height:29px;border:1px solid var(--border);border-radius:7px;display:grid;place-items:center;font-style:normal}.modern-footer span{display:flex;flex-direction:column}.modern-footer small{color:var(--muted)}.modern-footer nav{display:flex;align-items:center;gap:7px}.modern-footer nav a{width:30px;height:30px;border:1px solid var(--border);border-radius:50%;display:grid;place-items:center}.modern-footer nav img{width:16px;height:16px}@media(min-width:1101px){.sidebar-left,.sidebar-right{position:sticky;top:calc(var(--header-height) + 12px);max-height:calc(100vh - var(--header-height) - 24px);overflow:auto;scrollbar-width:thin}}@media(max-width:1220px){:root{--left-width:190px;--right-width:250px}.modern-header{grid-template-columns:205px minmax(560px,1fr) 220px}.modern-header nav a{min-width:76px}.shell{padding:12px;gap:10px}}@media(max-width:1100px){.modern-header{grid-template-columns:1fr auto;height:64px}.modern-header nav{display:none}.modern-account{padding-right:12px}.shell{display:block;padding:10px}.sidebar-left,.sidebar-right{display:none}.modern-footer{grid-template-columns:repeat(2,1fr);padding:14px}.modern-footer nav{grid-column:1/-1}.modern-footer .legal{grid-column:1/-1}}@media(max-width:560px){.modern-brand{padding-left:14px}.modern-brand>span{font-size:22px}.modern-account a,.modern-account button{height:40px;padding:0 12px}.modern-account button{display:none}.modern-footer{grid-template-columns:1fr}.modern-footer nav,.modern-footer .legal{grid-column:auto}}
/* UI completion: persistent header controls and content-aware sticky sidebars. */
.modern-brand>span{font-size:31px}
@media(min-width:1101px){.sidebar-left,.sidebar-right{position:sticky;top:min(calc(var(--header-height) + 12px),calc(100vh - var(--sidebar-height,600px) - 12px));max-height:none;overflow:visible;scrollbar-width:auto;transform:none!important}}
@media(max-width:560px){.modern-brand>span{font-size:25px}.modern-account a,.modern-account button{padding:0 10px}.modern-account #theme-toggle{display:none}}
.modern-account .mobile-menu-toggle,.mobile-navigation,.mobile-nav-backdrop{display:none!important}.mobile-menu-toggle{width:42px;height:42px;padding:10px!important;flex-direction:column;justify-content:center;gap:4px}.mobile-menu-toggle span{display:block;width:20px;height:2px;background:currentColor;border-radius:2px}.mobile-navigation{position:fixed;z-index:102;top:0;right:0;width:min(330px,88vw);height:100dvh;padding:14px;background:var(--surface);border-left:1px solid var(--border);box-shadow:-12px 0 35px rgba(0,0,0,.2)}.mobile-navigation header{display:flex;align-items:center;justify-content:space-between;padding:4px 3px 13px;border-bottom:1px solid var(--border)}.mobile-navigation header button{width:40px;height:40px;border:0;background:transparent;color:var(--text);font-size:27px}.mobile-navigation>a{display:flex;align-items:center;gap:12px;min-height:48px;padding:8px;border-bottom:1px solid var(--border);font-weight:700;text-decoration:none}.mobile-navigation>a img{width:22px;height:22px}.mobile-nav-backdrop{position:fixed;inset:0;z-index:101;background:rgba(0,0,0,.48)}body.mobile-menu-open{overflow:hidden}@media(max-width:1100px){.modern-account .mobile-menu-toggle,.mobile-navigation:not([hidden]),.mobile-nav-backdrop:not([hidden]){display:flex!important}.mobile-navigation:not([hidden]){flex-direction:column}.modern-account #theme-toggle{display:none!important}}