:root{--bg: #f3f7fa;--panel: #ffffff;--border: #e3e9ef;--text: #1f2a37;--muted: #6b7785;--accent: #5b9bd5;--accent-hover: #4a8fc4;--green: #93c83d;--user: #eaf3fb;--sidebar-bg: #fafcfe;--shadow: 0 1px 3px rgba(31, 42, 55, .06), 0 1px 2px rgba(31, 42, 55, .04)}*{box-sizing:border-box}html,body{height:100%}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text)}.app{height:100vh;display:flex;flex-direction:column}.header{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;border-bottom:1px solid var(--border);flex-shrink:0}.brand{display:flex;align-items:center;gap:10px}.logo{height:36px;width:auto;display:block}.brand-name{font-size:17px;font-weight:600;letter-spacing:.2px}.user{display:flex;align-items:center;gap:12px;color:var(--muted);font-size:14px}button{background:var(--accent);color:#fff;border:none;padding:9px 16px;border-radius:8px;cursor:pointer;font-size:14px;transition:background .15s ease}button:hover:not(:disabled){background:var(--accent-hover)}button:disabled{opacity:.55;cursor:default}.user button{background:transparent;border:1px solid var(--border);color:var(--muted)}.user button:hover:not(:disabled){background:#f0f4f8;color:var(--text)}.centered{flex:1;display:flex;align-items:center;justify-content:center}.muted{color:var(--muted)}.workspace{flex:1;display:flex;min-height:0}.sidebar{width:272px;flex-shrink:0;border-right:1px solid var(--border);background:var(--sidebar-bg);display:flex;flex-direction:column;padding:12px;gap:10px;overflow:hidden}.new-chat{width:100%}.conv-list{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:2px}.conv-empty{color:var(--muted);font-size:13px;padding:8px 10px}.conv-item{display:flex;align-items:center;gap:6px;padding:8px 10px;border-radius:8px;cursor:pointer;font-size:14px}.conv-item:hover{background:#eef3f8}.conv-item.active{background:#e2edf8}.conv-title{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.conv-actions{display:none;gap:2px}.conv-item:hover .conv-actions{display:flex}.conv-actions button{background:transparent;border:none;padding:2px 5px;color:var(--muted);font-size:13px;border-radius:6px}.conv-actions button:hover:not(:disabled){color:var(--text);background:#dde7f1}.conv-edit{width:100%;padding:5px 8px;border:1px solid var(--accent);border-radius:6px;font-size:14px;color:var(--text)}.conv-edit:focus{outline:none}.chat-area{flex:1;min-width:0;display:flex;flex-direction:column}.mobile-menu-btn{display:none;align-self:flex-start;margin:10px 0 0 12px;background:transparent;border:1px solid var(--border);color:var(--muted);font-size:13px;padding:7px 12px}.mobile-menu-btn:hover{background:#f0f4f8;color:var(--text)}.sidebar-overlay{display:none}.chat{flex:1;min-width:0;display:flex;flex-direction:column;padding:16px 20px}.messages{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:16px;width:100%;max-width:760px;margin:0 auto;padding-right:4px}.empty{color:var(--muted);text-align:center;margin-top:48px;line-height:1.5}.msg{display:flex;flex-direction:column;gap:4px}.msg .role{font-size:12px;color:var(--muted)}.msg .content{white-space:pre-wrap;line-height:1.55;padding:11px 14px;border-radius:10px;background:var(--panel);border:1px solid var(--border);box-shadow:var(--shadow)}.msg.user{align-items:flex-end}.msg.user .content{background:var(--user);border-color:#d6e7f6;align-self:flex-end;max-width:80%}.composer{display:flex;gap:8px;width:100%;max-width:760px;margin:12px auto 0}.composer textarea{flex:1;resize:none;padding:11px 13px;background:var(--panel);border:1px solid var(--border);border-radius:8px;color:var(--text);font-family:inherit;font-size:14px}.composer textarea::placeholder{color:#9aa6b2}.composer textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px #5b9bd526}.login{flex:1;display:flex;align-items:center;justify-content:center}.card{background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:30px;width:380px;max-width:100%;box-shadow:var(--shadow)}.card h2{margin:0 0 8px;font-size:19px}.hint{color:var(--muted);font-size:13.5px;line-height:1.5;margin:0 0 18px}.card input{width:100%;padding:11px 13px;margin-bottom:12px;background:#fbfdfe;border:1px solid var(--border);border-radius:8px;color:var(--text);font-size:14px}.card input::placeholder{color:#9aa6b2}.card input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px #5b9bd526}.card>button[type=submit]{width:100%}.link-btn{background:transparent;color:var(--accent);padding:8px 0}.link-btn:hover:not(:disabled){background:transparent;color:var(--accent-hover)}.dev-box{margin:4px 0 14px;padding:12px;background:#f3f8fc;border:1px dashed #c7dcef;border-radius:8px;word-break:break-all}.dev-box a{color:var(--accent);font-size:13px}.error{color:#d6453b;font-size:13px;margin:8px auto 0;width:100%;max-width:760px}.attach-btn{background:transparent;border:1px solid var(--border);color:var(--muted);font-size:17px;padding:0 12px;border-radius:8px;flex-shrink:0}.attach-btn:hover:not(:disabled){background:#f0f4f8;color:var(--text)}.mic-btn.recording{background:#fdecec;border-color:#e6a3a3;color:#d6453b}@keyframes mic-pulse{0%,to{opacity:1}50%{opacity:.5}}.mic-btn.recording{animation:mic-pulse 1s ease-in-out infinite}.composer-files,.msg-files{display:flex;flex-wrap:wrap;gap:6px}.composer-files{width:100%;max-width:760px;margin:0 auto;padding-bottom:8px}.msg-files{margin-bottom:2px}.file-chip{display:inline-flex;align-items:center;gap:6px;background:#eef3f8;border:1px solid var(--border);color:var(--text);font-size:12.5px;padding:4px 9px;border-radius:14px;max-width:240px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.file-chip.removable button{background:transparent;border:none;color:var(--muted);padding:0;font-size:12px;line-height:1;cursor:pointer}.file-chip.removable button:hover{color:var(--text);background:transparent}.report-btn{background:transparent;border:1px solid var(--border);color:var(--muted);font-size:13px;padding:7px 12px}.report-btn:hover:not(:disabled){background:#f0f4f8;color:var(--text)}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#1f2a3773;display:flex;align-items:center;justify-content:center;z-index:100;padding:16px}.modal{position:relative;background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:26px;width:440px;max-width:100%;box-shadow:0 10px 40px #1f2a3733}.modal h2{margin:0 0 6px;font-size:18px}.modal-close{position:absolute;top:12px;right:12px;background:transparent;border:none;color:var(--muted);font-size:15px;padding:4px 8px;border-radius:6px}.modal-close:hover:not(:disabled){background:#f0f4f8;color:var(--text)}.field-label{display:block;font-size:13px;color:var(--muted);margin:12px 0 5px}.modal select,.modal textarea{width:100%;padding:10px 12px;background:#fbfdfe;border:1px solid var(--border);border-radius:8px;color:var(--text);font-size:14px;font-family:inherit}.modal textarea{resize:vertical}.modal select:focus,.modal textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px #5b9bd526}.modal form>button[type=submit],.modal-sent button{width:100%;margin-top:16px}.modal-sent{text-align:center}@media (max-width: 768px){.header{padding:10px 14px}.brand-name{font-size:15px}.logo{height:30px}.report-btn{padding:6px 10px;font-size:12px}.user{gap:8px;font-size:13px}.sidebar{position:fixed;top:0;left:0;height:100%;width:82%;max-width:300px;transform:translate(-100%);transition:transform .2s ease;z-index:60;box-shadow:2px 0 18px #1f2a372e}.sidebar.open{transform:translate(0)}.sidebar-overlay{display:block;position:fixed;top:0;right:0;bottom:0;left:0;background:#1f2a3773;z-index:55}.mobile-menu-btn{display:inline-flex}.chat{padding:8px 12px 12px}.conv-actions{display:flex}}@media (max-width: 560px){.user .email,.brand-name{display:none}.modal{padding:20px}.msg.user .content{max-width:92%}.composer textarea{font-size:16px}}