:root{--bg:#0f1115;--panel:#171a21;--panel2:#1e222b;--line:#2a2f3a;--fg:#e6e9ef;--muted:#8b93a3;--accent:#5b8cff;--good:#3fb950;--warn:#d29922;--err:#f85149}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--fg);height:100vh}
.hidden{display:none!important}
.muted{color:var(--muted);font-weight:400;font-size:12px}
.error{color:var(--err);font-size:13px;margin-top:8px;min-height:16px}

/* Login */
.login-wrap{display:flex;align-items:center;justify-content:center;height:100vh}
.card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:32px;width:340px;display:flex;flex-direction:column;gap:12px}
.card h1{margin:0;font-size:20px}
.card input{background:var(--panel2);border:1px solid var(--line);border-radius:8px;padding:11px 12px;color:var(--fg);font-size:14px}
.card button,button{cursor:pointer;border:none;border-radius:8px;padding:11px 14px;font-size:14px;font-weight:600;background:var(--accent);color:#fff}
button.ghost{background:transparent;border:1px solid var(--line);color:var(--fg);font-weight:500}
button:disabled{opacity:.5;cursor:default}

/* App layout */
#app{display:flex;flex-direction:column;height:100vh}
header{display:flex;align-items:center;justify-content:space-between;padding:10px 16px;border-bottom:1px solid var(--line);background:var(--panel);gap:12px;flex-wrap:wrap}
.brand{font-weight:700}
.controls{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.ctl{font-size:12px;color:var(--muted);display:flex;align-items:center;gap:6px}
.ctl select{background:var(--panel2);border:1px solid var(--line);color:var(--fg);border-radius:8px;padding:7px 8px;font-size:13px}
.file-ctl{cursor:pointer;border:1px solid var(--line);border-radius:8px;padding:7px 10px;color:var(--fg)}
.toggle{cursor:pointer}

.doc-banner{padding:8px 16px;background:rgba(91,140,255,.12);border-bottom:1px solid var(--line);font-size:13px;color:var(--fg)}

main{flex:1;display:flex;overflow:hidden}
.chat{flex:1;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:14px}
.metrics{width:280px;border-left:1px solid var(--line);background:var(--panel);padding:16px;overflow-y:auto}
.metrics h3{margin:6px 0 10px;font-size:13px;text-transform:uppercase;letter-spacing:.5px;color:var(--muted)}
.metric{display:flex;justify-content:space-between;font-size:13px;padding:5px 0;border-bottom:1px dashed var(--line)}
.metric b{font-variant-numeric:tabular-nums}
.metrics hr{border:none;border-top:1px solid var(--line);margin:16px 0}

.msg{max-width:78%;padding:11px 14px;border-radius:12px;line-height:1.5;white-space:pre-wrap;font-size:14px}
.msg.user{align-self:flex-end;background:var(--accent);color:#fff}
.msg.assistant{align-self:flex-start;background:var(--panel2);border:1px solid var(--line)}
.msg.system{align-self:center;background:transparent;color:var(--muted);font-size:12px}

#chat-form{display:flex;gap:10px;padding:14px 16px;border-top:1px solid var(--line);background:var(--panel)}
#chat-form textarea{flex:1;resize:none;background:var(--panel2);border:1px solid var(--line);color:var(--fg);border-radius:10px;padding:11px 12px;font-size:14px;font-family:inherit;max-height:160px}
.pill{display:inline-block;font-size:11px;padding:2px 7px;border-radius:999px;font-weight:700}
.pill.hit{background:rgba(63,185,80,.2);color:var(--good)}
.pill.miss{background:rgba(210,153,34,.2);color:var(--warn)}