:root{--bg: #ffffff;--panel: #f7f7f8;--border: #e3e3e6;--text: #1f1f23;--muted: #6b6b72;--accent: #4f7cff;--user: #eef2ff;--bubble: #f4f4f6}[data-theme=dark]{--bg: #131316;--panel: #1b1b20;--border: #2a2a31;--text: #ececf1;--muted: #9a9aa5;--accent: #7aa2ff;--user: #23314f;--bubble: #1f1f25}*{box-sizing:border-box}html{height:100%}body,#root{margin:0;height:100vh;height:100dvh}body{background:var(--bg);color:var(--text);font:15px/1.55 system-ui,-apple-system,Segoe UI,Roboto,sans-serif}.app{display:grid;grid-template-columns:260px minmax(0,1fr);height:100vh;height:100dvh;min-width:0}.sidebar{background:var(--panel);border-right:1px solid var(--border);padding:12px;display:flex;flex-direction:column;gap:8px;overflow-y:auto}.new-chat{padding:10px;border-radius:10px;border:1px solid var(--border);background:var(--bg);color:var(--text);cursor:pointer}.chat-list{display:flex;flex-direction:column;gap:2px}.chat-item{display:flex;justify-content:space-between;align-items:center;padding:8px 10px;border-radius:8px;cursor:pointer}.chat-item:hover{background:var(--bubble)}.chat-item.active{background:var(--user)}.chat-title{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.del{border:none;background:none;color:var(--muted);cursor:pointer}.main{display:flex;flex-direction:column;height:100vh;height:100dvh;min-width:0}.header{display:flex;justify-content:space-between;align-items:center;padding:12px 20px;border-bottom:1px solid var(--border)}.brand{font-weight:600}.header-actions{display:flex;gap:8px}.icon-btn{border:1px solid var(--border);background:var(--bg);color:var(--text);border-radius:8px;padding:6px 10px;cursor:pointer}.chat-view{flex:1;overflow-y:auto;padding:24px;max-width:820px;margin:0 auto;width:100%}.empty{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px}.msg{display:flex;gap:12px;margin-bottom:22px}.avatar{width:32px;height:32px;border-radius:50%;flex:none;display:grid;place-items:center;font-size:12px;background:var(--bubble)}.msg.user .avatar{background:var(--accent);color:#fff}.bubble{background:var(--bubble);padding:4px 16px;border-radius:12px;max-width:100%;min-width:0;overflow-wrap:anywhere}.msg.user .bubble{background:var(--user)}.bubble pre{background:var(--panel);padding:10px;border-radius:8px;overflow-x:auto}.sources{display:flex;flex-wrap:wrap;gap:6px;margin:8px 0 12px}.chip{font-size:12px;padding:3px 8px;border-radius:999px;border:1px solid var(--border);color:var(--accent);text-decoration:none}.composer{display:flex;gap:8px;padding:16px;border-top:1px solid var(--border);max-width:820px;margin:0 auto;width:100%}.composer textarea{flex:1;resize:none;padding:12px 14px;border-radius:12px;border:1px solid var(--border);background:var(--bg);color:var(--text);font:inherit;min-height:46px;max-height:160px}.send{width:44px;border:none;border-radius:12px;background:var(--accent);color:#fff;font-size:16px;cursor:pointer}.send.stop{background:var(--muted)}.muted{color:var(--muted)}.disclaimer{max-width:820px;margin:0 auto;width:100%;padding:0 16px 12px;color:var(--muted);font-size:12px;line-height:1.35;text-align:center}.login-wrap{height:100vh;display:grid;place-items:center}.login-card{display:flex;flex-direction:column;gap:12px;width:min(320px,calc(100vw - 32px));padding:28px;border:1px solid var(--border);border-radius:16px;background:var(--panel)}.login-card input{padding:11px;border-radius:10px;border:1px solid var(--border);background:var(--bg);color:var(--text)}.login-card button{padding:11px;border-radius:10px;border:none;background:var(--accent);color:#fff;cursor:pointer}.error{color:#e5484d;font-size:13px}@media (max-width: 700px){body{overflow:hidden}.app{grid-template-columns:minmax(0,1fr);grid-template-rows:auto minmax(0,1fr)}.sidebar{min-width:0;flex-direction:row;align-items:center;gap:8px;padding:8px;border-right:0;border-bottom:1px solid var(--border);overflow-x:auto;overflow-y:hidden}.new-chat{flex:0 0 auto;padding:8px 12px;white-space:nowrap}.chat-list{min-width:0;flex:1 1 auto;flex-direction:row;gap:6px;overflow-x:auto}.chat-item{flex:0 0 min(220px,54vw);padding:7px 9px}.main{height:auto;min-height:0}.header{min-width:0;gap:12px;padding:10px 12px}.brand{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.header-actions{flex:0 0 auto}.icon-btn{min-width:38px;min-height:34px;padding:6px 8px}.chat-view{min-height:0;padding:16px 12px}.empty{min-height:0;padding:24px 16px;text-align:center}.msg{gap:8px;margin-bottom:16px}.avatar{width:28px;height:28px;font-size:11px}.bubble{padding:4px 12px}.composer{gap:8px;padding:10px 12px}.disclaimer{padding:0 12px calc(8px + env(safe-area-inset-bottom));font-size:11px}.composer textarea{min-width:0;padding:10px 12px}.send{flex:0 0 42px;width:42px}.login-wrap{padding:16px}.login-card{padding:24px}}