*{box-sizing:border-box}:root{--bg:#f5f5f7;--text:#1a1a1a;--card:#fff;--border:#e0e0e0;--input-bg:#f0f0f2;--accent:#2563eb;--user-bubble:#2563eb;--assistant-bubble:#eee;--assistant-text:#1a1a1a;--muted:#888}[data-theme=dark]{--bg:#1a1a1a;--text:#eee;--card:#242424;--border:#3a3a3a;--input-bg:#2a2a2a;--accent:#3b82f6;--user-bubble:#2563eb;--assistant-bubble:#333;--assistant-text:#eee;--muted:#999}body{background:var(--bg);color:var(--text);margin:0;font-family:system-ui,sans-serif;transition:background .2s,color .2s}.app{max-width:800px;margin:0 auto;padding:24px}.top-bar{justify-content:space-between;align-items:center;margin-bottom:24px;display:flex}h1{margin:0;font-size:24px}.theme-toggle{background:var(--card);border:1px solid var(--border);color:var(--text);cursor:pointer;border-radius:20px;padding:8px 14px;font-size:14px}.repo-input-row{gap:8px;margin-bottom:16px;display:flex}input{background:var(--input-bg);border:1px solid var(--border);color:var(--text);border-radius:8px;flex:1;padding:12px;font-size:14px}button{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:8px;padding:12px 18px;font-size:14px}button:disabled{opacity:.5;cursor:not-allowed}.placeholder-text{color:var(--muted);font-size:14px}.chat-window{background:var(--card);border:1px solid var(--border);scrollbar-width:thin;scrollbar-color:var(--border) transparent;border-radius:12px;flex-direction:column;height:450px;margin-bottom:16px;padding:20px;display:flex;overflow-y:auto}.chat-window::-webkit-scrollbar{width:6px}.chat-window::-webkit-scrollbar-thumb{background:var(--border);border-radius:10px}.message-row{margin-bottom:14px;display:flex}.message-row.user{justify-content:flex-end}.message-row.assistant{justify-content:flex-start}.message{border-radius:16px;max-width:75%;padding:10px 16px;font-size:14px;line-height:1.5}.message.user{background:var(--user-bubble);color:#fff;border-bottom-right-radius:4px}.message.assistant{background:var(--assistant-bubble);color:var(--assistant-text);border-bottom-left-radius:4px}.message-label{opacity:.6;text-transform:uppercase;letter-spacing:.3px;margin-bottom:4px;font-size:11px;font-weight:600}.message p{margin:0}.sources{color:var(--muted);border-top:1px solid #80808033;margin-top:8px;padding-top:8px;font-size:11px}.typing-indicator{gap:4px;padding:10px 16px;display:flex}.typing-indicator span{background:var(--muted);border-radius:50%;width:6px;height:6px;animation:1.4s ease-in-out infinite both bounce}.typing-indicator span:first-child{animation-delay:-.32s}.typing-indicator span:nth-child(2){animation-delay:-.16s}@keyframes bounce{0%,80%,to{transform:scale(0)}40%{transform:scale(1)}}.ask-row{background:var(--card);border:1px solid var(--border);border-radius:12px;gap:8px;padding:8px;display:flex}.ask-row input{background:0 0;border:none}.ask-row button{border-radius:8px}.mode-toggle-row{align-items:center;gap:10px;margin-bottom:16px;display:flex}.toggle-switch{background:var(--border);cursor:pointer;border-radius:20px;width:44px;height:24px;transition:background .2s;position:relative}.toggle-switch.active{background:var(--accent)}.toggle-knob{background:#fff;border-radius:50%;width:18px;height:18px;transition:transform .2s;position:absolute;top:3px;left:3px}.toggle-switch.active .toggle-knob{transform:translate(20px)}.mode-label{color:var(--text);font-size:14px}.mode-label span{color:var(--muted);font-size:12px;display:block}