:root{
  --bg:#0e1117;--panel:#161b22;--line:#232a34;--text:#e6edf3;--muted:#8b949e;
  --accent:#3b82f6;--accent2:#2563eb;--ok:#22c55e;--bad:#ef4444;--user:#1f6feb;
  --chip:#1c2430;--radius:16px;
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;background:var(--bg);color:var(--text);
  font:16px/1.55 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  -webkit-text-size-adjust:100%;overscroll-behavior-y:none;
}
#app{height:100dvh;display:flex;flex-direction:column}

/* ---------- login ---------- */
.login{max-width:360px;margin:14vh auto;padding:24px;width:calc(100% - 32px)}
.login h1{font-size:22px;margin:0 0 4px;display:flex;align-items:center;gap:8px}
.login p{color:var(--muted);font-size:14px;margin:0 0 20px}
.login input{width:100%;padding:13px;margin-bottom:10px;border-radius:12px;
  border:1px solid var(--line);background:var(--panel);color:var(--text);font-size:16px}
.login button{width:100%;padding:13px;border:0;border-radius:12px;background:var(--accent);
  color:#fff;font-size:16px;font-weight:600;cursor:pointer}
.login button:disabled{opacity:.5}
.login .err{color:var(--bad);font-size:14px;min-height:20px;margin-top:6px}

/* ---------- chat shell ---------- */
.top{display:flex;align-items:center;gap:10px;padding:10px 12px;
  padding-top:calc(10px + env(safe-area-inset-top));
  border-bottom:1px solid var(--line);background:var(--panel);position:sticky;top:0;z-index:5}
.top .nav{flex:1;display:flex;align-items:center;gap:4px;min-width:0;overflow-x:auto}
.top .nav a{color:var(--muted);text-decoration:none;font-size:13.5px;padding:6px 9px;border-radius:9px;white-space:nowrap}
.top .nav a.on{color:var(--text);background:var(--chip);font-weight:600}
.top .acts{display:flex;gap:8px;flex:none}
.top .dot{width:8px;height:8px;border-radius:50%;background:var(--bad);flex:none;margin-right:2px}
.top .dot.on{background:var(--ok)}
.top .nav .proj{flex:none;max-width:42vw;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:600;padding:6px 9px;font-size:13.5px}
.top button{background:transparent;border:1px solid var(--line);color:var(--text);
  border-radius:10px;padding:7px 11px;font-size:14px;cursor:pointer}

.stream{flex:1;overflow-y:auto;padding:16px 12px 8px;-webkit-overflow-scrolling:touch}
.wrap{max-width:820px;margin:0 auto;display:flex;flex-direction:column;gap:14px}

.msg{display:flex;flex-direction:column;max-width:88%}
.msg.user{align-self:flex-end;align-items:flex-end}
.msg.assistant{align-self:flex-start;align-items:flex-start}
.bubble{padding:11px 14px;border-radius:var(--radius);white-space:pre-wrap;word-wrap:break-word;
  overflow-wrap:anywhere;font-size:15.5px}
.msg.user .bubble{background:var(--user);color:#fff;border-bottom-right-radius:5px}
.msg.assistant .bubble{background:var(--panel);border:1px solid var(--line);border-bottom-left-radius:5px}
.bubble.error{border-color:var(--bad);color:#fecaca}
.bubble code{background:#0b0f16;border:1px solid var(--line);border-radius:5px;padding:1px 5px;
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13.5px}
.bubble pre.code{background:#0b0f16;border:1px solid var(--line);border-radius:10px;padding:10px;
  overflow-x:auto;margin:6px 0;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px}

/* ---------- rendered markdown inside assistant bubbles ---------- */
.bubble .content{display:block;white-space:normal}
.bubble .content>*:first-child{margin-top:0}
.bubble .content>*:last-child{margin-bottom:0}
.bubble .content p{margin:0 0 8px}
.bubble .content h1,.bubble .content h2,.bubble .content h3,
.bubble .content h4,.bubble .content h5,.bubble .content h6{
  margin:14px 0 6px;line-height:1.3;font-weight:600}
.bubble .content h1{font-size:20px}
.bubble .content h2{font-size:18px}
.bubble .content h3{font-size:16.5px}
.bubble .content h4,.bubble .content h5,.bubble .content h6{font-size:15.5px;color:var(--muted)}
.bubble .content ul,.bubble .content ol{margin:6px 0;padding-left:22px}
.bubble .content li{margin:2px 0}
.bubble .content li>ul,.bubble .content li>ol{margin:2px 0}
.bubble .content blockquote{margin:8px 0;padding:2px 12px;border-left:3px solid var(--line);color:var(--muted)}
.bubble .content hr{border:0;border-top:1px solid var(--line);margin:12px 0}
.bubble .content a{color:var(--accent);text-decoration:none}
.bubble .content a:hover{text-decoration:underline}
.bubble .content strong{font-weight:600}
.bubble .content del{color:var(--muted)}
.bubble .content table{border-collapse:collapse;margin:8px 0;font-size:14px;display:block;overflow-x:auto}
.bubble .content th,.bubble .content td{border:1px solid var(--line);padding:6px 10px;text-align:left}
.bubble .content th{background:var(--chip);font-weight:600}

.tools{display:flex;flex-direction:column;gap:6px;margin-top:8px;width:100%}
.chip{background:var(--chip);border:1px solid var(--line);border-radius:10px;font-size:13px;
  color:var(--muted);overflow:hidden}
.chip .head{display:flex;align-items:center;gap:8px;padding:8px 10px;cursor:pointer}
.chip .ic{flex:none}
.chip .nm{color:var(--text);font-weight:500}
.chip .sm{color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;flex:1;
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12.5px}
.chip .st{flex:none;font-size:12px}
.chip .st.run{animation:pulse 1s ease-in-out infinite}
.chip .body{display:none;padding:0 10px 10px;white-space:pre-wrap;word-break:break-all;
  font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:12.5px;color:var(--muted)}
.chip.open .body{display:block}
@keyframes pulse{50%{opacity:.35}}

.typing{display:inline-block;width:7px;height:14px;background:var(--accent);border-radius:2px;
  animation:blink 1s step-start infinite;vertical-align:text-bottom;margin-left:1px}
@keyframes blink{50%{opacity:0}}
.meta{color:var(--muted);font-size:11.5px;margin-top:5px}

/* ---------- composer ---------- */
.composer{border-top:1px solid var(--line);background:var(--panel);
  padding:10px 12px calc(10px + env(safe-area-inset-bottom))}
.composer .row{max-width:820px;margin:0 auto;display:flex;gap:8px;align-items:flex-end}
.composer textarea{flex:1;resize:none;max-height:40vh;min-height:44px;padding:11px 13px;
  border-radius:14px;border:1px solid var(--line);background:var(--bg);color:var(--text);
  font:16px/1.4 system-ui,sans-serif}
.composer .send,.composer .stop{flex:none;width:44px;height:44px;border:0;border-radius:50%;
  color:#fff;font-size:18px;cursor:pointer;display:flex;align-items:center;justify-content:center}
.composer .send{background:var(--accent)}
.composer .send:disabled{opacity:.4}
.composer .stop{background:var(--bad)}
.toast{position:fixed;left:50%;transform:translateX(-50%);bottom:calc(84px + env(safe-area-inset-bottom));
  background:#000;border:1px solid var(--line);color:var(--text);padding:9px 14px;border-radius:20px;
  font-size:13.5px;opacity:0;transition:opacity .2s;pointer-events:none;z-index:9}
.toast.show{opacity:.95}
.empty{color:var(--muted);text-align:center;margin-top:18vh;font-size:15px;padding:0 24px}

/* ---------- session drawer ---------- */
.drawer{position:fixed;inset:0;background:rgba(0,0,0,.55);opacity:0;pointer-events:none;transition:opacity .2s;z-index:20}
.drawer.open{opacity:1;pointer-events:auto}
.sheet{position:absolute;top:0;left:0;bottom:0;width:min(88vw,380px);background:var(--panel);
  border-right:1px solid var(--line);transform:translateX(-100%);transition:transform .22s ease;
  display:flex;flex-direction:column}
.drawer.open .sheet{transform:none}
.sheet-head{display:flex;justify-content:space-between;align-items:center;padding:16px;
  padding-top:calc(16px + env(safe-area-inset-top));border-bottom:1px solid var(--line);font-weight:600}
.sheet-head .x{cursor:pointer;color:var(--muted);font-size:18px;padding:4px 8px}
.sheet-list{flex:1;overflow-y:auto;padding:8px}
.ses{display:flex;align-items:center;gap:6px;padding:8px 8px 8px 12px;border-radius:10px;border:1px solid transparent}
.ses:hover,.ses:active{background:var(--bg)}
.ses.on{border-color:var(--accent)}
.ses-body{flex:1;min-width:0;cursor:pointer;padding:3px 0}
.ses-del{flex:none;background:transparent;border:0;color:var(--muted);font-size:15px;cursor:pointer;opacity:.5;padding:8px;border-radius:8px;line-height:1}
.ses-del:hover{opacity:1;color:var(--bad);background:var(--panel)}
.ses-t{font-size:14.5px;margin-bottom:3px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.ses-m{font-size:12px;color:var(--muted)}
.ses-empty{color:var(--muted);padding:14px;font-size:14px}
.run-dot{color:var(--ok);font-size:10px;vertical-align:middle;animation:pulse 1s ease-in-out infinite}