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35%, transparent);display:block;position:fixed;inset:0}}@media (width<=600px){:root{--rail-width:0px}.brand-rail{display:none}.chat-header{min-height:64px;padding:10px 12px}.header-actions{display:none}.mobile-menu-trigger{display:grid}.sidebar-trigger{display:none}.mobile-nav-overlay{z-index:50;background:color-mix(in srgb, var(--black) 42%, transparent);border:0;display:block;position:fixed;inset:0}.mobile-nav-panel{z-index:60;width:min(300px,86vw);padding:12px 16px max(18px, env(safe-area-inset-bottom));background:var(--background);border-right:1px solid var(--border);box-shadow:18px 0 45px color-mix(in srgb, var(--black) 16%, transparent);visibility:hidden;flex-direction:column;transition:transform .2s,visibility .2s;display:flex;position:fixed;inset:0 auto 0 0;transform:translate(-105%)}.mobile-nav-panel.is-open{visibility:visible;transform:translate(0)}.mobile-nav-heading{justify-content:space-between;align-items:flex-start;min-height:96px;display:flex}.mobile-nav-actions{flex-direction:column;gap:10px;display:flex}.mobile-nav-footer{flex-direction:column;gap:10px;margin-top:auto;padding-top:20px;display:flex}.mobile-about-chevron{margin-left:auto;transition:transform .15s}.mobile-about .mobile-nav-button[aria-expanded=true] .mobile-about-chevron{transform:rotate(180deg)}.mobile-about-content{color:var(--muted);background:var(--surface);border-radius:12px;margin-top:8px;padding:12px 14px;font-size:13px;line-height:1.5}.mobile-about-content p{white-space:pre-line;margin:0}.mobile-theme-toggle{margin-top:0}.history-sidebar{width:min(300px,86vw);left:0}.welcome-area{padding:0 12px max(16px, env(safe-area-inset-bottom));grid-template-rows:minmax(0,1fr) auto;justify-items:stretch;display:grid;overflow:hidden}.welcome-rook-logo{width:280px;height:280px;margin-bottom:14px}.welcome-logo-mark{width:168px;height:168px}.welcome-logo-wordmark{width:154px;height:60px;margin-top:-8px}.welcome-heading{flex-direction:column;align-self:center;align-items:center;width:100%;max-width:none;margin-bottom:0;display:flex}.welcome-title{letter-spacing:-.045em;width:100%;font-size:16px}.message-composer{border-radius:27px;gap:8px;padding:8px 9px 8px 16px}.message-composer textarea{font-size:16px}.active-composer{padding:0 12px max(16px, env(safe-area-inset-bottom))}.message-list{padding:20px 16px}.message-user{max-width:95%;padding:10px 16px}.auth-page{padding:16px}.auth-form{padding:22px 18px}.admin-navigation{min-height:58px;padding:7px 10px}.admin-navigation nav button{min-height:38px;padding:0 11px}.admin-sign-out{border:0;min-height:38px;padding:0 11px}.knowledge-page{padding:24px 14px}.knowledge-header,.upload-panel,.documents-heading{flex-direction:column;align-items:stretch}.knowledge-header{gap:14px}.sync-state{align-self:flex-start}.upload-controls{flex-direction:column;align-items:stretch}.documents-actions{flex-direction:column-reverse;align-items:stretch}.file-picker{max-width:none}.document-row{flex-wrap:wrap;align-items:flex-start}.document-details{flex-basis:calc(100% - 40px);width:calc(100% - 40px)}.document-status{margin-left:35px}}@media (height<=550px){.welcome-area{padding-top:0}.welcome-rook-logo{width:170px;height:170px;margin-bottom:8px}.welcome-logo-mark{width:100px;height:100px}.welcome-logo-wordmark{width:96px;height:38px;margin-top:-5px}.welcome-heading{margin-bottom:16px}}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition:none!important;animation:none!important}}