*{box-sizing:border-box}body{margin:0;font-family:Segoe UI,Helvetica Neue,Arial,sans-serif}#root{min-height:100svh}:root{--sidebar-bg:#f3f5f9;--sidebar-hover:#e4e9f2;--main-bg:#fffffe;--card-bg:#fffffd;--blue:#1e3a6e;--blue-hover:#16294f;--red:#c0392b;--border:#dbe1ec;--text-primary:#12213f;--text-secondary:#5a6a85;--text-muted:#9aa6ba}.auth-page{background:var(--main-bg);justify-content:center;align-items:center;min-height:100vh;font-family:Segoe UI,Helvetica Neue,Arial,sans-serif;display:flex}.auth-card{background:var(--card-bg);border:1px solid var(--border);text-align:center;border-radius:16px;width:400px;max-width:90vw;padding:36px 32px 32px}.auth-logo{background:var(--blue);border-radius:14px;justify-content:center;align-items:center;width:56px;height:56px;margin:0 auto;display:flex}.auth-logo span{color:#fff;font-size:26px;font-weight:700}.auth-card h1{color:var(--text-primary);margin:14px 0 2px;font-size:20px;font-weight:700}.auth-subtitle{color:var(--text-secondary);margin:0 0 24px;font-size:13px}.auth-fields{text-align:left}.auth-fields label{color:var(--text-secondary);margin-bottom:4px;font-size:13px;font-weight:700;display:block}.auth-fields input{background:var(--sidebar-bg);border:1px solid var(--border);width:100%;height:42px;color:var(--text-primary);border-radius:8px;margin-bottom:14px;padding:0 12px;font-family:inherit;font-size:14px}.auth-fields input::placeholder{color:var(--text-muted)}.auth-fields input:focus{border-color:var(--blue);outline:none}.auth-error{min-height:16px;color:var(--red);text-align:center;margin:8px 0 0;font-size:12px}.auth-btn-primary{background:var(--blue);color:#fff;cursor:pointer;border:none;border-radius:10px;width:100%;height:44px;margin-top:20px;font-family:inherit;font-size:14px;font-weight:700;transition:background .15s}.auth-btn-primary:hover{background:var(--blue-hover)}.auth-btn-primary:disabled{background:var(--text-muted);cursor:default}.auth-divider{text-align:center;margin-top:20px}.auth-divider span{background:var(--border);height:1px;display:block}.auth-divider p{color:var(--text-muted);margin:8px 0 0;font-size:12px}.auth-btn-outline{border:1px solid var(--border);width:100%;height:40px;color:var(--text-secondary);cursor:pointer;background:0 0;border-radius:10px;margin-top:8px;font-family:inherit;font-size:13px;text-decoration:none;transition:background .15s;display:block}.auth-btn-outline:hover{background:var(--sidebar-hover)}:root{--blue:#1e3a6e;--blue-hover:#16294f;--border:#dbe1ec;--sidebar-bg:#f3f5f9;--sidebar-hover:#e4e9f2;--text-primary:#12213f;--text-secondary:#5a6a85;--text-muted:#9aa6ba;--red:#c0392b}.chat-layout{height:100vh;font-family:Segoe UI,Helvetica Neue,Arial,sans-serif;display:flex}.chat-sidebar{background:var(--sidebar-bg);border-right:1px solid var(--border);flex-direction:column;flex-shrink:0;width:240px;padding:16px;display:flex}.chat-sidebar h2{color:var(--text-primary);margin:0 0 12px;font-size:15px}.chat-new-btn{border:1px solid var(--border);width:100%;height:36px;color:var(--text-primary);cursor:pointer;background:#fff;border-radius:8px;margin-bottom:12px;font-size:13px}.chat-new-btn:hover{background:var(--sidebar-hover)}.chat-session-list{flex:1;overflow-y:auto}.chat-session-item{cursor:pointer;color:var(--text-secondary);border-radius:8px;justify-content:space-between;align-items:center;margin-bottom:4px;padding:8px 10px;font-size:13px;display:flex}.chat-session-item:hover{background:var(--sidebar-hover)}.chat-session-item.active{color:var(--text-primary);border:1px solid var(--border);background:#fff}.chat-session-item .title{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.chat-session-item button{color:var(--text-muted);cursor:pointer;background:0 0;border:none;font-size:12px}.chat-session-item button:hover{color:var(--red)}.chat-logout{border:1px solid var(--border);height:36px;color:var(--text-secondary);cursor:pointer;background:0 0;border-radius:8px;margin-top:12px;font-size:13px}.chat-logout:hover{background:var(--sidebar-hover)}.chat-main{background:#fff;flex-direction:column;flex:1;display:flex}.chat-messages{flex-direction:column;flex:1;gap:16px;padding:24px;display:flex;overflow-y:auto}.chat-empty{text-align:center;color:var(--text-muted);margin:auto}.chat-bubble{white-space:pre-wrap;border-radius:14px;max-width:70%;padding:12px 16px;font-size:14px;line-height:1.5}.chat-bubble.user{background:var(--blue);color:#fff;align-self:flex-end}.chat-bubble.assistant{background:var(--sidebar-bg);color:var(--text-primary);border:1px solid var(--border);align-self:flex-start}.chat-files{flex-wrap:wrap;gap:8px;padding:0 24px;display:flex}.chat-file-chip{background:var(--sidebar-bg);border:1px solid var(--border);color:var(--text-secondary);border-radius:999px;padding:4px 10px;font-size:12px}.chat-composer{border-top:1px solid var(--border);gap:8px;padding:16px 24px;display:flex}.chat-composer textarea{resize:none;border:1px solid var(--border);border-radius:8px;flex:1;height:44px;padding:10px 12px;font-family:inherit;font-size:14px}.chat-composer textarea:focus{border-color:var(--blue);outline:none}.chat-composer button,.chat-attach-btn{background:var(--blue);color:#fff;cursor:pointer;border:none;border-radius:8px;height:44px;padding:0 16px;font-size:14px}.chat-composer button:hover,.chat-attach-btn:hover{background:var(--blue-hover)}.chat-composer button:disabled{background:var(--text-muted);cursor:default}.chat-attach-btn{color:var(--text-secondary);border:1px solid var(--border);background:0 0}.chat-attach-btn:hover{background:var(--sidebar-hover)}.chat-error{color:var(--red);padding:8px 24px;font-size:13px}