:root{--bg:#0f1012;--surface:#17181c;--surface-2:#1f2127;--border:#2a2d35;--text:#ececf1;--text-dim:#9b9ca7;--accent:#6c5ce7;--accent-soft:#8a7bff;--user-bubble:#2b2f3a;--danger:#ff6b6b;--radius:12px;--sidebar-w:268px}:root[data-theme=light]{--bg:#f7f7f8;--surface:#fff;--surface-2:#f0f0f3;--border:#e2e2e7;--text:#1f2024;--text-dim:#6b6c76;--user-bubble:#e8e8f0;--danger:#c0392b}*{box-sizing:border-box}html,body,#root{height:100%}body{background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;margin:0;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}button{font:inherit;cursor:pointer}.login-screen{background:radial-gradient(900px 500px at 15% -10%, #6c5ce747, transparent 60%), radial-gradient(700px 500px at 95% 110%, #8a7bff33, transparent 60%), var(--bg);place-items:center;min-height:100%;padding:24px 16px;display:grid}.login-card{background:var(--surface);border:1px solid var(--border);border-radius:18px;flex-direction:column;gap:8px;width:100%;max-width:400px;padding:32px 28px;display:flex;box-shadow:0 24px 60px #0000004d}.login-mark{background:linear-gradient(135deg, var(--accent), var(--accent-soft));color:#fff;border-radius:14px;place-items:center;width:48px;height:48px;margin-bottom:6px;display:grid}.login-card h1{letter-spacing:-.02em;margin:0;font-size:24px}.login-sub{color:var(--text-dim);margin:0 0 14px;font-size:14px}.login-card label{color:var(--text-dim);margin-top:8px;font-size:13px;font-weight:500}.login-card input{border:1px solid var(--border);background:var(--surface-2);width:100%;color:var(--text);border-radius:10px;outline:none;padding:11px 13px;font-size:14px}.login-card input:focus{border-color:var(--accent)}.password-row{gap:8px;display:flex}.ghost-btn{border:1px solid var(--border);color:var(--text-dim);background:0 0;border-radius:10px;padding:0 12px;font-size:13px}.ghost-btn:hover{color:var(--text)}.primary-btn{background:linear-gradient(135deg, var(--accent), var(--accent-soft));color:#fff;border:0;border-radius:10px;margin-top:18px;padding:12px;font-size:15px;font-weight:600}.primary-btn:hover{filter:brightness(1.08)}.login-error{color:var(--danger);background:#ff6b6b1f;border-radius:9px;margin-top:12px;padding:9px 12px;font-size:13px}.app{height:100%;display:flex;overflow:hidden}.scrim{z-index:15;background:#00000080;position:fixed;inset:0}.sidebar{width:var(--sidebar-w);flex:0 0 var(--sidebar-w);background:var(--surface);border-right:1px solid var(--border);flex-direction:column;gap:10px;padding:12px;display:flex}.sidebar-top{align-items:center;gap:8px;display:flex}.new-chat-btn{border:1px solid var(--border);background:var(--surface-2);color:var(--text);border-radius:10px;flex:1;align-items:center;gap:8px;padding:10px 12px;font-size:14px;font-weight:500;display:flex}.new-chat-btn:hover{border-color:var(--accent)}.plus{color:var(--accent-soft);font-size:17px;line-height:1}.chat-list{flex-direction:column;flex:1;gap:2px;display:flex;overflow-y:auto}.chat-item{cursor:pointer;color:var(--text-dim);border-radius:9px;align-items:center;gap:6px;padding:9px 10px;font-size:13.5px;display:flex}.chat-item:hover{background:var(--surface-2);color:var(--text)}.chat-item.is-active{background:var(--surface-2);color:var(--text);font-weight:500}.chat-title{text-overflow:ellipsis;white-space:nowrap;flex:1;overflow:hidden}.chat-actions{opacity:0;gap:2px;display:flex}.chat-item:hover .chat-actions,.chat-item.is-active .chat-actions{opacity:1}.rename-input{border:1px solid var(--accent);background:var(--bg);color:var(--text);border-radius:6px;outline:none;flex:1;padding:4px 6px;font-size:13.5px}.icon-btn{width:28px;height:28px;color:var(--text-dim);background:0 0;border:0;border-radius:7px;place-items:center;font-size:13px;display:grid}.icon-btn:hover{background:var(--border);color:var(--text)}.icon-btn.is-lg{width:38px;height:38px;color:var(--text);border-radius:9px}.icon-btn.is-lg:hover{background:var(--surface-2);color:var(--accent-soft)}.sidebar-bottom{border-top:1px solid var(--border);flex-direction:column;gap:2px;padding-top:8px;display:flex}.subtle-btn{text-align:left;color:var(--text-dim);background:0 0;border:0;border-radius:9px;padding:9px 10px;font-size:13px}.subtle-btn:hover{background:var(--surface-2);color:var(--text)}.main{flex-direction:column;flex:1;min-width:0;display:flex}.topbar{border-bottom:1px solid var(--border);background:var(--surface);align-items:center;gap:10px;padding:12px 18px;display:flex}.topbar-title{flex:1;align-items:center;gap:10px;min-width:0;display:flex}.topbar-title strong{text-overflow:ellipsis;white-space:nowrap;font-size:14.5px;font-weight:600;overflow:hidden}.model-chip{border:1px solid var(--border);background:var(--surface-2);color:var(--text-dim);border-radius:999px;flex:none;padding:3px 9px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:11px}.thread{flex:1;overflow-y:auto}.messages{flex-direction:column;gap:20px;max-width:780px;margin:0 auto;padding:26px 20px 8px;display:flex}.row{align-items:flex-start;gap:12px;display:flex}.row.user{flex-direction:row-reverse}.avatar{background:var(--surface-2);height:30px;color:var(--text-dim);border:1px solid var(--border);border-radius:9px;flex:0 0 30px;place-items:center;font-size:11px;font-weight:600;display:grid}.row.model .avatar{background:linear-gradient(135deg, var(--accent), var(--accent-soft));color:#fff;border-color:#0000;font-size:14px}.bubble{background:var(--surface);border:1px solid var(--border);overflow-wrap:anywhere;border-radius:14px;max-width:calc(100% - 54px);padding:11px 15px;font-size:14.5px;line-height:1.65}.row.user .bubble{background:var(--user-bubble);border-color:#0000}.bubble.is-error{border-color:var(--danger);color:var(--danger)}.bubble>:first-child{margin-top:0}.bubble>:last-child{margin-bottom:0}.bubble pre{background:var(--bg);border:1px solid var(--border);border-radius:9px;padding:12px;font-size:13px;overflow-x:auto}.bubble code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.92em}.bubble :not(pre)>code{background:var(--surface-2);border-radius:5px;padding:2px 5px}.bubble table{border-collapse:collapse;width:100%;font-size:13.5px}.bubble th,.bubble td{border:1px solid var(--border);text-align:left;padding:6px 9px}.dots{gap:4px;padding:3px 0;display:inline-flex}.dots i{background:var(--text-dim);border-radius:50%;width:6px;height:6px;animation:1.3s ease-in-out infinite blink}.dots i:nth-child(2){animation-delay:.18s}.dots i:nth-child(3){animation-delay:.36s}@keyframes blink{0%,80%,to{opacity:.25;transform:translateY(0)}40%{opacity:1;transform:translateY(-2px)}}.empty-state{text-align:center;flex-direction:column;justify-content:center;align-items:center;gap:6px;height:100%;padding:40px 20px;display:flex}.empty-mark{color:#fff;background:linear-gradient(135deg, var(--accent), var(--accent-soft));border-radius:16px;place-items:center;width:52px;height:52px;margin-bottom:10px;font-size:24px;display:grid}.empty-state h2{letter-spacing:-.02em;margin:0;font-size:25px}.empty-state p{color:var(--text-dim);margin:0 0 18px;font-size:14px}.suggestions{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;width:100%;max-width:560px;display:grid}.suggestions button{border:1px solid var(--border);background:var(--surface);color:var(--text);text-align:left;border-radius:11px;padding:13px 15px;font-size:13.5px;line-height:1.45}.suggestions button:hover{border-color:var(--accent);background:var(--surface-2)}.composer-wrap{width:100%;max-width:780px;margin:0 auto;padding:12px 20px 16px}.composer{border:1px solid var(--border);background:var(--surface);border-radius:16px;flex-direction:column;gap:8px;padding:9px;display:flex}.composer:focus-within{border-color:var(--accent)}.composer.is-dragging{border-color:var(--accent);background:var(--surface-2);border-style:dashed}.composer-row{align-items:flex-end;gap:8px;display:flex}.attach-btn{border:1px solid var(--border);height:34px;color:var(--text-dim);background:0 0;border-radius:10px;flex:0 0 34px;place-items:center;display:grid}.attach-btn:hover:not(:disabled){color:var(--accent-soft);border-color:var(--accent)}.attach-btn:disabled{opacity:.4;cursor:not-allowed}.thumbs{flex-wrap:wrap;gap:8px;padding:2px 2px 0;display:flex}.thumb{width:62px;height:62px;position:relative}.thumb img{object-fit:cover;border:1px solid var(--border);border-radius:9px;width:100%;height:100%;display:block}.thumb-x{background:var(--danger);color:#fff;border:0;border-radius:50%;place-items:center;width:19px;height:19px;font-size:10px;line-height:1;display:grid;position:absolute;top:-6px;right:-6px}.msg-images{flex-wrap:wrap;gap:8px;margin-bottom:8px;display:flex}.msg-images img{border:1px solid var(--border);border-radius:10px;max-width:230px;max-height:230px;display:block}.composer-error{text-align:center;color:var(--danger);margin:8px 0 0;font-size:12px}.composer textarea{resize:none;min-width:0;color:var(--text);scrollbar-width:thin;scrollbar-color:var(--border) transparent;background:0 0;border:0;outline:none;flex:1;max-height:200px;padding:5px 0;font-size:14.5px;line-height:1.6}.send-btn{background:linear-gradient(135deg, var(--accent), var(--accent-soft));color:#fff;border:0;border-radius:10px;flex:0 0 34px;height:34px;font-size:15px}.send-btn:disabled{opacity:.4;cursor:not-allowed}.send-btn.is-stop{background:var(--danger);font-size:11px}.composer-note{text-align:center;color:var(--text-dim);margin:8px 0 0;font-size:11.5px}.composer textarea::-webkit-scrollbar{width:8px;height:8px}.thread::-webkit-scrollbar{width:8px;height:8px}.chat-list::-webkit-scrollbar{width:8px;height:8px}.bubble pre::-webkit-scrollbar{width:8px;height:8px}.composer textarea::-webkit-scrollbar-track{background:0 0}.thread::-webkit-scrollbar-track{background:0 0}.chat-list::-webkit-scrollbar-track{background:0 0}.bubble pre::-webkit-scrollbar-track{background:0 0}.composer textarea::-webkit-scrollbar-thumb{background:var(--border);background-clip:content-box;border:2px solid #0000;border-radius:999px}.thread::-webkit-scrollbar-thumb{background:var(--border);background-clip:content-box;border:2px solid #0000;border-radius:999px}.chat-list::-webkit-scrollbar-thumb{background:var(--border);background-clip:content-box;border:2px solid #0000;border-radius:999px}.bubble pre::-webkit-scrollbar-thumb{background:var(--border);background-clip:content-box;border:2px solid #0000;border-radius:999px}.composer textarea::-webkit-scrollbar-thumb:hover{background:var(--text-dim);background-clip:content-box}.thread::-webkit-scrollbar-thumb:hover{background:var(--text-dim);background-clip:content-box}.chat-list::-webkit-scrollbar-thumb:hover{background:var(--text-dim);background-clip:content-box}.bubble pre::-webkit-scrollbar-thumb:hover{background:var(--text-dim);background-clip:content-box}.thread,.chat-list,.bubble pre{scrollbar-width:thin;scrollbar-color:var(--border) transparent}.only-mobile{display:none}@media (width<=768px){.only-mobile{display:grid}.sidebar{z-index:20;transition:transform .22s;position:fixed;inset:0 auto 0 0;transform:translate(-100%)}.sidebar.is-open{transform:translate(0)}.messages{padding:18px 16px 8px}.composer-wrap{padding:10px 16px 14px}.suggestions{grid-template-columns:1fr}.empty-state h2{font-size:21px}}