:root{--bg: #0f1115;--card: #171a21;--text: #e8e8ea;--sub: #9aa0ac;--accent: #5b8cff;--border: #2a2f3a;--code: #1d2129}@media (prefers-color-scheme: light){:root{--bg: #f5f6f8;--card: #ffffff;--text: #1c1f26;--sub: #5b6270;--accent: #2a5fd9;--border: #e1e4ea;--code: #eef0f4}}.app{min-height:100vh;display:flex;flex-direction:column}.app-header{padding:16px 20px;border-bottom:1px solid var(--border);background:var(--card)}.app-header h1{font-size:1.2rem;margin:0 0 4px;color:var(--accent)}.app-header p{font-size:.85rem;color:var(--sub);margin:0}.app-header-top{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}.lang-switch{display:flex;gap:6px;flex:none}.lang-switch-btn{background:var(--code);color:var(--sub);border:1px solid var(--border);border-radius:8px;padding:5px 10px;font-size:.78rem;cursor:pointer}.lang-switch-btn:hover{color:var(--text)}.lang-switch-btn.active{background:var(--accent);color:#fff;border-color:var(--accent)}.app-error{background:#4a1f1f;color:#ffb4b4;padding:10px 20px;font-size:.85rem}.visually-hidden-input{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.app-body{flex:1;display:flex;gap:16px;padding:16px;min-height:0}.app-left{flex:1;min-width:0;display:flex;flex-direction:column;gap:12px}.app-right{flex:1;min-width:0;display:flex;flex-direction:column}@media (max-width: 900px){.app-body{flex-direction:column}}.filedrop{background:var(--card);border:1px solid var(--border);border-radius:10px;padding:14px}.filedrop-label{display:block;font-size:.9rem;cursor:pointer}.filedrop-current{margin-top:10px;font-size:.85rem;color:var(--sub)}.filedrop-current button{margin-left:10px;background:none;border:1px solid var(--border);border-radius:6px;color:var(--text);cursor:pointer;padding:2px 8px}.filedrop-hint{margin-top:8px;font-size:.75rem;color:var(--sub)}.chatpanel{flex:1;display:flex;flex-direction:column;background:var(--card);border:1px solid var(--border);border-radius:10px;padding:12px;min-height:300px}.chatpanel-messages{flex:1;overflow-y:auto;margin-bottom:10px;display:flex;flex-direction:column;gap:10px}.chatpanel-empty{color:var(--sub);font-size:.85rem;text-align:center;padding:30px 10px}.chat-bubble{max-width:85%;padding:8px 12px;border-radius:10px;font-size:.88rem;white-space:pre-wrap}.chat-user{align-self:flex-end;background:var(--accent);color:#fff}.chat-assistant{align-self:flex-start;background:var(--code);border:1px solid var(--border)}.chat-role{font-size:.7rem;opacity:.7;margin-bottom:2px}.chat-loading{opacity:.7}.chatpanel-input{border-top:1px solid var(--border);padding-top:10px}.chatpanel-websearch{display:flex;align-items:center;gap:6px;font-size:.8rem;color:var(--sub);margin-bottom:6px}.chatpanel-input textarea{width:100%;background:var(--code);border:1px solid var(--border);border-radius:8px;color:var(--text);padding:8px;font-family:inherit;font-size:.88rem;resize:vertical}.chatpanel-input button{margin-top:6px;background:var(--accent);color:#fff;border:none;border-radius:8px;padding:8px 16px;cursor:pointer;font-size:.85rem}.chatpanel-input button:disabled{opacity:.5;cursor:not-allowed}.resultpanel{flex:1;display:flex;flex-direction:column;background:var(--card);border:1px solid var(--border);border-radius:10px;padding:12px;min-height:300px}.resultpanel-actions{display:flex;gap:10px;margin-bottom:10px}.resultpanel-actions button{background:var(--accent);color:#fff;border:none;border-radius:8px;padding:8px 16px;cursor:pointer;font-size:.85rem}.resultpanel-actions button:disabled{opacity:.5;cursor:not-allowed}.resultpanel-download{background:var(--code)!important;color:var(--text)!important;border:1px solid var(--border)!important}.resultpanel-empty{flex:1;display:flex;align-items:center;justify-content:center;color:var(--sub);font-size:.85rem;text-align:center;padding:20px}.resultpanel-preview{flex:1;width:100%;border:1px solid var(--border);border-radius:8px;background:#fff}.watermark-toggle{display:flex;align-items:center;gap:6px;font-size:.78rem;color:var(--sub);margin-bottom:8px}