:root{--bg:#0b0f14;--bg-2:#0f1620;--panel:#121a24;--border:#1e2a3a;--text:#e7edf3;--muted:#8aa0b4;--accent:#5cf79a;--accent-2:#6cb8ff;--danger:#ff6b6b;--code-bg:#0a0f16}*{box-sizing:border-box}body,html{margin:0;padding:0;height:100%}body{background:var(--bg);color:var(--text);font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-size:15px;line-height:1.55}a{color:var(--accent-2)}button{font:inherit;color:var(--text);background:var(--bg-2);border:1px solid var(--border);padding:8px 12px;border-radius:6px;cursor:pointer}button:hover{border-color:var(--accent)}button[disabled]{opacity:.5;cursor:not-allowed}input,textarea{font:inherit;color:var(--text);background:var(--bg-2);border:1px solid var(--border);border-radius:6px;padding:10px 12px;width:100%}input:focus,textarea:focus{outline:none;border-color:var(--accent)}.app{display:grid;grid-template-columns:280px 1fr;height:100vh}.sidebar{background:var(--bg-2);border-right:1px solid var(--border);display:flex;flex-direction:column;padding:14px;gap:10px;overflow-y:auto}.sidebar h1{font-size:16px;margin:0 0 6px;display:flex;align-items:center;gap:8px}.sidebar h1 .dot{width:8px;height:8px;background:var(--accent);border-radius:50%}.sidebar .user{font-size:12px;color:var(--muted);margin-bottom:10px}.conv-list{display:flex;flex-direction:column;gap:4px;flex:1 1;min-height:0}.conv-item{padding:8px 10px;border-radius:6px;cursor:pointer;font-size:13px;color:var(--muted);display:flex;justify-content:space-between;align-items:center}.conv-item.active,.conv-item:hover{background:var(--panel);color:var(--text)}.conv-item.active{border:1px solid var(--border)}.conv-item .del{background:transparent;border:none;color:var(--muted);padding:2px 6px}.conv-item .del:hover{color:var(--danger)}.main{display:flex;flex-direction:column;height:100vh;min-width:0}.header{padding:12px 18px;border-bottom:1px solid var(--border);display:flex;justify-content:space-between;align-items:center;background:var(--bg-2)}.header h2{margin:0;font-size:14px;color:var(--muted);font-weight:500}.messages{flex:1 1;overflow-y:auto;padding:18px;display:flex;flex-direction:column;gap:14px}.msg{max-width:850px;width:100%;align-self:flex-start;background:var(--panel);border:1px solid var(--border);border-radius:8px;padding:12px 14px}.msg.user{align-self:flex-end;background:#17263a;border-color:#233a5c}.msg.tool{background:#0e1a14;border-color:#1b3a22;font-size:13px;color:var(--muted)}.msg .role{font-size:11px;text-transform:uppercase;color:var(--muted);letter-spacing:.08em;margin-bottom:6px}.msg.user .role{color:var(--accent-2)}.msg.assistant .role{color:var(--accent)}.msg pre{border:1px solid var(--border);border-radius:6px;padding:12px;overflow-x:auto;font-size:13px}.msg code,.msg pre{background:var(--code-bg);font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace}.msg code{padding:1px 5px;border-radius:4px;font-size:.92em}.msg pre code{background:transparent;padding:0}.composer{border-top:1px solid var(--border);padding:14px 18px;background:var(--bg-2)}.composer form{display:flex;gap:8px;align-items:flex-end;max-width:1000px;margin:0 auto}.composer textarea{min-height:56px;max-height:240px;resize:vertical}.composer button.send{background:var(--accent);color:#052715;border-color:var(--accent);font-weight:600}.composer button.send:hover{filter:brightness(1.1)}.composer .hint{color:var(--muted);font-size:12px;margin-top:6px;text-align:center}.auth{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px}.auth .card{background:var(--panel);border:1px solid var(--border);border-radius:10px;padding:22px;width:100%;max-width:380px}.auth h1{margin:0 0 4px;font-size:20px}.auth .sub{color:var(--muted);font-size:13px;margin-bottom:16px}.auth .field{margin-bottom:10px}.auth .field label{display:block;font-size:12px;color:var(--muted);margin-bottom:4px}.auth .toggle{text-align:center;margin-top:10px;font-size:13px;color:var(--muted)}.auth .toggle button{background:transparent;border:none;color:var(--accent-2);padding:0}.auth .error{color:var(--danger);font-size:13px;margin-bottom:10px}.empty{color:var(--muted);text-align:center;padding:40px 20px}.empty h3{color:var(--text);margin:0 0 6px}