:root{color-scheme:light;--bg:#f7f4ef;--panel:#fffdf8;--panel-2:#f0ece5;--text:#22201d;--muted:#756f66;--muted-2:#9b9489;--line:#ded7cd;--line-soft:#ece6dc;--accent:#4f4a42;--accent-2:#6c6458;--danger:#8a3d30;--shadow:0 18px 50px rgba(46,40,32,0.12);--radius:22px;--safe-bottom:env(safe-area-inset-bottom,0px)}*{box-sizing:border-box}body,html{margin:0;min-height:100%;background:var(--bg);color:var(--text);font-family:ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}body{min-height:100dvh}button,input,select,textarea{font:inherit}button{border:none;cursor:pointer}button:disabled{cursor:not-allowed;opacity:.58}a{color:inherit;text-decoration:none}.app-shell{min-height:100dvh;display:grid;grid-template-columns:304px 1fr;background:radial-gradient(circle at top left,rgba(255,255,255,.8),transparent 34rem),var(--bg)}.sidebar{border-right:1px solid var(--line);background:rgba(255,253,248,.74);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);height:100dvh;position:-webkit-sticky;position:sticky;top:0;flex-direction:column;padding:16px}.brand,.sidebar{display:flex;gap:12px}.brand{align-items:center;justify-content:space-between;padding:4px 2px 12px}.brand-mark{width:34px;height:34px;border-radius:12px;background:linear-gradient(145deg,#4f4a42,#8a8173);box-shadow:inset 0 1px 0 rgba(255,255,255,.35)}.brand-title{font-size:16px;font-weight:720;letter-spacing:-.02em}.brand-subtitle{color:var(--muted);font-size:12px;margin-top:1px}.sidebar-actions{display:grid;grid-gap:8px;gap:8px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:42px;padding:10px 14px;border-radius:14px;background:var(--panel-2);color:var(--text);border:1px solid var(--line-soft);transition:transform .16s ease,background .16s ease,box-shadow .16s ease}.btn:hover{transform:translateY(-1px);box-shadow:0 8px 22px rgba(48,42,35,.08)}.btn.primary{background:var(--accent);color:#fffaf1}.btn.ghost,.btn.primary{border-color:transparent}.btn.ghost{background:transparent;color:var(--muted)}.btn.small{min-height:34px;padding:7px 10px;border-radius:11px;font-size:13px}.conversation-list{overflow:auto;flex:1 1;padding:4px 0;display:flex;flex-direction:column;gap:6px}.conversation-item{text-align:left;display:grid;grid-gap:4px;gap:4px;padding:12px;border-radius:14px;background:transparent;color:var(--text);border:1px solid transparent}.conversation-item.active,.conversation-item:hover{background:rgba(255,255,255,.68);border-color:var(--line-soft)}.conversation-item-title{font-size:14px;font-weight:620;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}.conversation-item-meta,.sidebar-footer{font-size:12px;color:var(--muted)}.sidebar-footer{border-top:1px solid var(--line-soft);padding-top:12px;display:grid;grid-gap:8px;gap:8px}.main{min-width:0;height:100dvh;display:grid;grid-template-rows:auto 1fr auto}.topbar{height:64px;display:flex;align-items:center;justify-content:space-between;padding:10px 18px;border-bottom:1px solid var(--line);background:rgba(247,244,239,.78);-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);position:-webkit-sticky;position:sticky;top:0;z-index:10}.topbar-actions,.topbar-left{display:flex;align-items:center;gap:8px;min-width:0}.mobile-only{display:none}.chat-title{font-size:15px;font-weight:700;letter-spacing:-.01em;max-width:min(42vw,520px)}.chat-title,.model-pill{overflow:hidden;white-space:nowrap;text-overflow:ellipsis}.model-pill{font-size:12px;color:var(--muted);border:1px solid var(--line-soft);border-radius:999px;padding:6px 9px;background:rgba(255,253,248,.58);max-width:260px}.messages-wrap{overflow-y:auto;padding:18px 18px 24px;scroll-behavior:smooth}.messages-inner{width:min(880px,100%);margin:0 auto;display:flex;flex-direction:column;gap:14px}.empty-state{min-height:calc(100dvh - 220px);display:grid;align-content:center;justify-items:center;grid-gap:16px;gap:16px;text-align:center;color:var(--muted);padding:28px}.empty-state h1{margin:0;font-size:clamp(28px,6vw,44px);letter-spacing:-.04em;color:var(--text)}.empty-state p{max-width:520px;margin:0;line-height:1.7}.load-older{align-self:center;margin:4px 0 12px}.message{display:flex;gap:12px;align-items:flex-start}.message.user{flex-direction:row-reverse}.avatar{width:32px;height:32px;border-radius:50%;display:grid;place-items:center;background:var(--panel-2);color:var(--muted);flex:0 0 auto;border:1px solid var(--line-soft)}.message.user .avatar{background:#ded8ce;color:#403a32}.bubble{max-width:min(720px,calc(100% - 48px));border-radius:20px;padding:13px 15px;background:rgba(255,253,248,.9);border:1px solid var(--line-soft);box-shadow:0 8px 28px rgba(48,42,35,.04);line-height:1.7;font-size:15px;overflow-wrap:anywhere}.message.user .bubble{background:#ebe6dd;border-color:#ded7cd}.message-content{white-space:pre-wrap}.message-meta{margin-top:8px;font-size:12px;color:var(--muted);display:flex;align-items:center;gap:8px}.dot-pulse{width:6px;height:6px;border-radius:999px;background:var(--muted);display:inline-block;animation:pulse 1s ease-in-out infinite}@keyframes pulse{0%,to{opacity:.35;transform:scale(.9)}50%{opacity:1;transform:scale(1.2)}}.attachments-grid{display:grid;grid-template-columns:repeat(2,minmax(0,160px));grid-gap:8px;gap:8px;margin-top:10px}.attachment-image{width:100%;border-radius:14px;border:1px solid var(--line-soft);background:var(--panel-2);object-fit:cover;max-height:220px}.composer-shell{padding:12px 18px calc(12px + var(--safe-bottom));background:linear-gradient(to top,var(--bg) 72%,rgba(247,244,239,0))}.composer{width:min(880px,100%);margin:0 auto;background:rgba(255,253,248,.94);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:24px;padding:10px;display:grid;grid-gap:9px;gap:9px}.composer textarea{width:100%;min-height:48px;max-height:180px;border:none;outline:none;resize:none;background:transparent;color:var(--text);padding:8px 10px;line-height:1.55}.composer textarea::placeholder,.login-card input::placeholder{color:var(--muted-2)}.composer-bottom{display:flex;align-items:center;justify-content:space-between;gap:8px}.composer-left,.composer-right{display:flex;align-items:center;gap:8px;min-width:0}.model-select{max-width:320px;min-height:36px;border-radius:12px;border:1px solid var(--line-soft);background:var(--panel-2);color:var(--text);padding:0 10px;outline:none}.icon-button{width:38px;height:38px;border-radius:13px;display:inline-grid;place-items:center;background:var(--panel-2);color:var(--text);border:1px solid var(--line-soft)}.send-button{width:40px;height:40px;border-radius:14px;display:inline-grid;place-items:center;background:var(--accent);color:#fffaf1}.preview-row{display:flex;gap:8px;overflow-x:auto;padding:2px 2px 0}.preview-card{position:relative;width:74px;height:74px;border-radius:16px;overflow:hidden;border:1px solid var(--line-soft);background:var(--panel-2);flex:0 0 auto}.preview-card img{width:100%;height:100%;object-fit:cover}.preview-card button{position:absolute;top:4px;right:4px;width:24px;height:24px;border-radius:50%;display:grid;place-items:center;background:rgba(34,32,29,.72);color:#fffaf1}.notice{border:1px solid var(--line);background:rgba(255,253,248,.78);color:var(--muted);border-radius:14px;padding:11px 12px;font-size:13px;line-height:1.55}.toast{position:fixed;z-index:50;left:50%;bottom:calc(18px + var(--safe-bottom));transform:translateX(-50%);background:rgba(34,32,29,.88);color:#fffaf1;border-radius:999px;padding:10px 14px;font-size:13px;box-shadow:var(--shadow)}.login-page{min-height:100dvh;display:grid;place-items:center;padding:22px;background:radial-gradient(circle at 20% 10%,rgba(255,255,255,.9),transparent 28rem),var(--bg)}.login-card{width:min(420px,100%);background:rgba(255,253,248,.9);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:28px;padding:26px;display:grid;grid-gap:16px;gap:16px}.login-card h1{margin:0;font-size:28px;letter-spacing:-.04em}.login-card p{margin:0;color:var(--muted);line-height:1.65}.field{display:grid;grid-gap:7px;gap:7px}.field label{font-size:13px;color:var(--muted)}.field input{min-height:48px;border-radius:15px;border:1px solid var(--line);background:#fffdf8;padding:0 14px;outline:none;color:var(--text)}.error-text{color:var(--danger);font-size:13px;line-height:1.5}.drawer-backdrop{display:none}.shared-shell{min-height:100dvh;display:grid;grid-template-rows:auto 1fr}.shared-header{padding:16px 18px;border-bottom:1px solid var(--line);background:rgba(247,244,239,.86);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);position:-webkit-sticky;position:sticky;top:0;z-index:10}.shared-header-inner{width:min(880px,100%);margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:12px}.shared-title{font-weight:760;letter-spacing:-.02em}@media (max-width:760px){.app-shell{display:block}.mobile-only{display:inline-grid}.sidebar{position:fixed;z-index:40;width:min(86vw,320px);left:0;top:0;bottom:0;transform:translateX(-105%);transition:transform .2s ease;box-shadow:var(--shadow)}.sidebar.open{transform:translateX(0)}.drawer-backdrop{display:block;position:fixed;inset:0;z-index:35;background:rgba(34,32,29,.28);opacity:0;pointer-events:none;transition:opacity .18s ease}.drawer-backdrop.open{opacity:1;pointer-events:auto}.main{height:100dvh}.topbar{height:58px;padding:8px 10px}.chat-title{max-width:46vw;font-size:14px}.model-pill,.topbar-actions .btn.small span{display:none}.messages-wrap{padding:13px 10px 18px}.messages-inner{gap:12px}.message{gap:8px}.avatar{width:28px;height:28px}.bubble{max-width:calc(100% - 36px);border-radius:18px;padding:11px 12px;font-size:15px}.composer-shell{padding:8px 8px calc(8px + var(--safe-bottom))}.composer{border-radius:22px;padding:8px}.composer textarea{min-height:46px;max-height:150px;padding:7px 8px;font-size:16px}.composer-bottom{gap:6px}.composer-left,.model-select{min-width:0;flex:1 1}.model-select{font-size:12px}.icon-button{width:36px;height:36px;border-radius:12px}.send-button{width:38px;height:38px;border-radius:13px}.empty-state{min-height:calc(100dvh - 210px);padding:16px}.attachments-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.login-card{border-radius:24px;padding:22px}}.icon-button svg,.send-button svg,.spin{flex:0 0 auto}.spin,button:disabled svg[data-lucide=loader-2],label svg[data-lucide=loader-2]{animation:spin .9s linear infinite}@keyframes spin{to{transform:rotate(1turn)}}