:root{
  --bg:#0d0f11;
  --bg-side:#121417;
  --bg-raise:#16191d;
  --bg-hover:#1c2025;
  --bg-bubble:#1e2227;
  --line:#24282e;
  --text:#e8ecef;
  --text-2:#a8b1b9;
  --text-3:#6e7880;
  --accent:#3ecfb2;
  --accent-dim:#1d3e39;
  --danger:#e0705f;
  --ok:#5ec98f;
  --radius:10px;
  --side-w:302px;
}
*{box-sizing:border-box}
/* Author display rules beat the UA stylesheet's [hidden]{display:none}, so
   anything toggled with el.hidden needs this to actually disappear. */
[hidden]{display:none!important}
html,body{height:100%}
body{
  margin:0;background:var(--bg);color:var(--text);
  font-family:Inter,system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:15px;line-height:1.6;-webkit-font-smoothing:antialiased;
  overscroll-behavior:none;
}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
input,textarea,select{font-family:inherit;font-size:15px}

/* ---------- gate ---------- */
.gate{position:fixed;inset:0;background:var(--bg);display:grid;place-items:center;z-index:100;padding:24px}
.gate-box{width:100%;max-width:320px;text-align:center;display:flex;flex-direction:column;gap:14px}
.gate-mark{width:44px;height:44px;border-radius:50%;background:var(--accent);margin:0 auto 6px;position:relative}
.gate-mark::before,.gate-mark::after{content:"";position:absolute;top:15px;width:5px;height:14px;border-radius:3px;background:#0d0f11}
.gate-mark::before{left:13px}.gate-mark::after{right:13px}
.gate h1{margin:0;font-size:26px;font-weight:700;letter-spacing:-.02em}
.gate p{margin:0;color:var(--text-3);font-size:14px}
.gate input{
  width:100%;padding:13px 16px;border-radius:var(--radius);border:1px solid var(--line);
  background:var(--bg-raise);color:var(--text);text-align:center;letter-spacing:.4em;font-size:18px;
}
.gate input:focus{outline:2px solid var(--accent-dim);border-color:var(--accent)}
.gate button{
  padding:12px;border-radius:var(--radius);background:var(--accent);color:#06231d;font-weight:600;font-size:15px;
}
.gate button:hover{filter:brightness(1.08)}
.gate-err{color:var(--danger);font-size:13px}

/* ---------- layout ---------- */
.app{display:flex;height:100dvh;overflow:hidden}
.sidebar{
  width:var(--side-w);flex:0 0 var(--side-w);background:var(--bg-side);
  border-right:1px solid var(--line);display:flex;flex-direction:column;min-height:0;
}
.main{flex:1;display:flex;flex-direction:column;min-width:0;min-height:0}

.brand{display:flex;align-items:center;gap:10px;padding:16px 14px;border-bottom:1px solid var(--line)}
.brand-mark{width:24px;height:24px;border-radius:50%;background:var(--accent);position:relative;flex:none}
.brand-mark::before,.brand-mark::after{content:"";position:absolute;top:8px;width:3px;height:8px;border-radius:2px;background:#0d0f11}
.brand-mark::before{left:7px}.brand-mark::after{right:7px}
.brand-name{font-weight:600;font-size:16px;letter-spacing:-.01em}
.brand-new{margin-left:auto;font-size:19px;line-height:1}

.icon-btn{
  width:30px;height:30px;border-radius:7px;color:var(--text-3);
  display:grid;place-items:center;font-size:15px;flex:none;
}
.icon-btn:hover{background:var(--bg-hover);color:var(--text)}

.agent-list{flex:1;overflow-y:auto;padding:8px 8px 20px;min-height:0}
.agent{margin-bottom:2px}
.agent-row{
  display:flex;align-items:center;gap:9px;padding:8px 8px;border-radius:8px;cursor:pointer;
  user-select:none;
}
.agent-row:hover{background:var(--bg-hover)}
.agent-row.active{background:var(--bg-hover)}
.a-avatar{width:22px;height:22px;border-radius:50%;flex:none;position:relative}
.a-avatar::before,.a-avatar::after{content:"";position:absolute;top:7px;width:3px;height:7px;border-radius:2px;background:rgba(0,0,0,.65)}
.a-avatar::before{left:6px}.a-avatar::after{right:6px}
.a-dot{width:6px;height:6px;border-radius:50%;background:var(--ok);flex:none}
.a-name{font-size:14.5px;font-weight:500;flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.a-caret{color:var(--text-3);font-size:11px;transition:transform .15s ease;flex:none}
.agent.open .a-caret{transform:rotate(90deg)}
.a-new{opacity:0;font-size:17px}
.agent-row:hover .a-new{opacity:1}

/* Drag starts only from the grip, so the sidebar still scrolls on touch. */
.a-grip{
  color:var(--text-3);font-size:13px;line-height:1;flex:none;cursor:grab;
  padding:2px 3px;opacity:0;touch-action:none;
}
.agent-row:hover .a-grip{opacity:.7}
.a-grip:hover{opacity:1!important;color:var(--text-2)}
.a-grip:active{cursor:grabbing}
@media (hover:none){ .a-grip{opacity:.5} }

/* Lifted row: raised above its neighbours and following the finger. */
.agent.drag-lift{
  position:relative;z-index:20;
  box-shadow:0 8px 22px rgba(0,0,0,.5);
  border-radius:8px;
}
.agent.drag-lift .agent-row{
  background:var(--bg-hover);
  outline:1px solid var(--accent-dim);
  border-radius:8px;
}
.agent:not(.drag-lift){transition:transform .15s ease}
body.dragging-agent{cursor:grabbing;user-select:none}

.chat-list{display:none;padding:2px 0 6px 26px}
.agent.open .chat-list{display:block}
.chat-item{
  display:flex;align-items:center;gap:6px;padding:6px 9px;border-radius:7px;
  font-size:13.5px;color:var(--text-2);cursor:pointer;
}
.chat-item:hover{background:var(--bg-hover);color:var(--text)}
.chat-item.active{background:var(--bg-hover);color:var(--text)}
.chat-title{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.chat-del{opacity:0;color:var(--text-3);font-size:13px;padding:0 2px}
.chat-item:hover .chat-del{opacity:1}
.chat-del:hover{color:var(--danger)}
.no-chats{padding:6px 9px;font-size:13px;color:var(--text-3)}

.sidebar-foot{
  border-top:1px solid var(--line);padding:10px 12px;display:flex;align-items:center;gap:10px;
}
.who{display:flex;align-items:center;gap:9px;flex:1;min-width:0}
.who-dot{
  width:28px;height:28px;border-radius:50%;background:var(--bg-hover);display:grid;place-items:center;
  font-size:12px;font-weight:600;color:var(--text-2);flex:none;
}
.who-text{display:flex;flex-direction:column;line-height:1.25;min-width:0}
.who-text strong{font-size:13.5px;font-weight:600}
.who-text span{font-size:11.5px;color:var(--text-3)}

/* ---------- topbar ---------- */
.topbar{
  display:flex;align-items:center;gap:10px;padding:0 14px;height:56px;
  border-bottom:1px solid var(--line);flex:none;
}
.menu-btn{display:none}
.top-dot{width:22px;height:22px;border-radius:50%;background:var(--line);flex:none;position:relative}
.top-dot::before,.top-dot::after{content:"";position:absolute;top:7px;width:3px;height:7px;border-radius:2px;background:rgba(0,0,0,.65)}
.top-dot::before{left:6px}.top-dot::after{right:6px}
.top-name{font-weight:600;font-size:15.5px}
.spacer{flex:1}

/* ---------- thread ---------- */
.thread{flex:1;overflow-y:auto;padding:26px 0 10px;min-height:0;scroll-behavior:smooth}
.inner{max-width:820px;margin:0 auto;padding:0 22px}
.empty{max-width:460px;margin:14vh auto;text-align:center;padding:0 22px}
.empty-mark{width:46px;height:46px;border-radius:50%;background:var(--bg-hover);margin:0 auto 18px}
.empty h2{font-size:20px;margin:0 0 8px;font-weight:600}
.empty p{color:var(--text-3);margin:0;font-size:14.5px}

.msg{margin-bottom:26px}
.msg.user{display:flex;justify-content:flex-end}
.msg.user .bubble{
  background:var(--bg-bubble);border-radius:14px;padding:11px 16px;max-width:75%;
  white-space:pre-wrap;word-wrap:break-word;
}
.msg.assistant .body{max-width:100%}

/* One activity block per turn: live timer, caret, steps hidden underneath. */
.act{
  border:1px solid var(--line);border-radius:10px;background:var(--bg-raise);
  margin-bottom:14px;overflow:hidden;max-width:460px;
}
.act-head{
  display:flex;align-items:center;gap:10px;padding:9px 13px;user-select:none;
}
.act.expandable .act-head{cursor:pointer}
.act.expandable .act-head:hover{background:var(--bg-hover)}
.act-caret{
  color:var(--text-3);font-size:10px;width:10px;flex:none;visibility:hidden;
  transition:transform .15s ease;
}
.act.expandable .act-caret{visibility:visible}
.act.open .act-caret{transform:rotate(90deg)}
.act-label{font-size:13.5px;color:var(--text-2);font-weight:500}
.act-time{
  margin-left:auto;font-family:"IBM Plex Mono",monospace;font-size:12px;
  color:var(--text-3);font-variant-numeric:tabular-nums;flex:none;
}
.act-body{display:none;border-top:1px solid var(--line);padding:5px 0}
.act.open .act-body{display:block}
.act-row{
  display:flex;align-items:baseline;gap:10px;padding:5px 13px;
  font-family:"IBM Plex Mono",monospace;font-size:12px;color:var(--text-2);
}
.act-row .st{color:var(--ok);flex:none;width:10px}
.act-row.running .st{color:var(--text-3)}
.act-row.err .st{color:var(--danger)}
.act-row .nm{flex:none}
.act-row .arg{
  color:var(--text-3);flex:1;min-width:0;overflow:hidden;
  text-overflow:ellipsis;white-space:nowrap;
}
.act-row .dur{color:var(--text-3);flex:none;font-variant-numeric:tabular-nums}

/* Spinner inside the activity header while a turn is live. */
.act-dots{display:flex;align-items:center;gap:4px;flex:none;height:12px}
.act-dots i{width:5px;height:5px;border-radius:50%;background:var(--text-3);opacity:.45}
.act .tickmark{color:var(--ok);font-size:12px;flex:none;width:12px;text-align:center}
@media (prefers-reduced-motion:no-preference){
  .act-dots i{animation:bounce 1.25s ease-in-out infinite}
  .act-dots i:nth-child(2){animation-delay:.16s}
  .act-dots i:nth-child(3){animation-delay:.32s}
}

.files{display:flex;flex-wrap:wrap;gap:9px;margin-top:14px}
.file{
  display:inline-flex;align-items:center;gap:9px;padding:9px 15px;border-radius:9px;
  background:var(--bg-raise);border:1px solid var(--line);color:var(--text);
  font-size:13.5px;font-weight:500;text-decoration:none;
}
.file:hover{background:var(--bg-hover);border-color:#333a42}
.file .dl{color:var(--text-3)}
.file .sz{color:var(--text-3);font-size:12px;font-weight:400}

.notice{color:var(--text-3);font-size:13px;font-style:italic;margin-bottom:10px}
.err-line{color:var(--danger);font-size:13.5px;margin-bottom:10px}

/* markdown */
.body p{margin:0 0 13px}
.body p:last-child{margin-bottom:0}
.body h1,.body h2,.body h3{margin:20px 0 10px;font-weight:600;line-height:1.3}
.body h1{font-size:21px}.body h2{font-size:18px}.body h3{font-size:16px}
.body ul,.body ol{margin:0 0 13px;padding-left:22px}
.body li{margin-bottom:5px}
.body a{color:var(--accent)}
.body code{
  font-family:"IBM Plex Mono",monospace;font-size:.87em;background:var(--bg-raise);
  padding:2px 6px;border-radius:5px;border:1px solid var(--line);
}
.body pre{
  background:var(--bg-raise);border:1px solid var(--line);border-radius:9px;
  padding:14px 16px;overflow-x:auto;margin:0 0 14px;
}
.body pre code{background:none;border:none;padding:0;font-size:13px;line-height:1.55}
.body blockquote{border-left:3px solid var(--line);margin:0 0 13px;padding-left:14px;color:var(--text-2)}
.table-wrap{overflow-x:auto;margin:0 0 15px}
.body table{border-collapse:collapse;width:100%;font-size:14px}
.body th,.body td{text-align:left;padding:10px 14px;border-bottom:1px solid var(--line)}
.body th{font-weight:600;color:var(--text)}
.body td{color:var(--text-2)}
.body tr:last-child td{border-bottom:none}
.cursor{display:inline-block;width:7px;height:15px;background:var(--accent);vertical-align:-2px;margin-left:2px;border-radius:1px}
@media (prefers-reduced-motion:no-preference){
  .cursor{animation:blink 1s steps(2) infinite}
  @keyframes blink{0%,50%{opacity:1}51%,100%{opacity:0}}
}

/* ---------- composer ---------- */
.composer-wrap{flex:none;padding:8px 0 20px}
.composer{
  max-width:820px;margin:0 auto;display:flex;align-items:flex-end;gap:8px;
  background:var(--bg-raise);border:1px solid var(--line);border-radius:14px;
  padding:8px 8px 8px 16px;
}
.composer:focus-within{border-color:#333a42}
.composer textarea{
  flex:1;background:none;border:none;color:var(--text);resize:none;outline:none;
  max-height:200px;padding:7px 0;line-height:1.55;
}
.composer textarea::placeholder{color:var(--text-3)}
.send-btn,.stop-btn{
  width:34px;height:34px;border-radius:9px;display:grid;place-items:center;flex:none;font-size:14px;
}
.send-btn{background:var(--accent);color:#06231d}
.send-btn:hover{filter:brightness(1.08)}
.send-btn:disabled{background:var(--bg-hover);color:var(--text-3);cursor:default;filter:none}
.stop-btn{background:var(--danger);color:#fff;font-size:11px}

/* ---------- modal ---------- */
.modal{position:fixed;inset:0;background:rgba(0,0,0,.62);display:grid;place-items:center;z-index:60;padding:20px}
.modal-box{
  width:100%;max-width:560px;max-height:88dvh;background:var(--bg-side);
  border:1px solid var(--line);border-radius:14px;display:flex;flex-direction:column;overflow:hidden;
}
.modal-head{display:flex;align-items:center;padding:16px 18px;border-bottom:1px solid var(--line)}
.modal-head h2{margin:0;font-size:16.5px;font-weight:600;flex:1}
.modal-body{padding:18px;overflow-y:auto;display:flex;flex-direction:column;gap:15px}
.modal-body label{display:flex;flex-direction:column;gap:7px;font-size:13px;color:var(--text-2);font-weight:500}
.modal-body input,.modal-body textarea{
  background:var(--bg-raise);border:1px solid var(--line);border-radius:9px;
  padding:10px 13px;color:var(--text);outline:none;width:100%;
}
.modal-body textarea{resize:vertical;line-height:1.6}
.modal-body input:focus,.modal-body textarea:focus{border-color:var(--accent)}
.modal-body input[type=color]{padding:4px;height:42px;cursor:pointer}
.row{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px}
.hint{font-size:11.5px;color:var(--text-3);font-weight:400;font-family:"IBM Plex Mono",monospace}

.lookup{position:relative}
.lookup-menu{
  position:absolute;left:0;right:0;top:calc(100% + 4px);z-index:5;
  background:var(--bg-raise);border:1px solid var(--line);border-radius:9px;
  max-height:220px;overflow-y:auto;box-shadow:0 12px 32px rgba(0,0,0,.5);
}
.lookup-opt{
  padding:9px 13px;font-family:"IBM Plex Mono",monospace;font-size:12.5px;
  color:var(--text-2);cursor:pointer;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.lookup-opt:hover,.lookup-opt.sel{background:var(--bg-hover);color:var(--text)}
.lookup-opt b{color:var(--accent);font-weight:600}
.lookup-none{padding:9px 13px;font-size:12.5px;color:var(--text-3)}
.modal-foot{display:flex;gap:9px;align-items:center;padding:14px 18px;border-top:1px solid var(--line)}
.modal-foot button{padding:9px 17px;border-radius:9px;font-size:14px;font-weight:500}
.primary{background:var(--accent);color:#06231d;font-weight:600}
.ghost{background:var(--bg-hover);color:var(--text)}
.danger{background:none;color:var(--danger);padding-left:0!important}
.danger:hover{text-decoration:underline}

/* ---------- mobile ---------- */
@media (max-width:820px){
  .menu-btn{display:grid}
  .sidebar{
    position:fixed;left:0;top:0;bottom:0;z-index:50;transform:translateX(-100%);
    transition:transform .2s ease;box-shadow:0 0 40px rgba(0,0,0,.5);
  }
  .sidebar.open{transform:none}
  .inner,.composer{padding-left:16px;padding-right:16px}
  .composer{margin:0 12px;padding-left:14px}
  .msg.user .bubble{max-width:88%}
  .row{grid-template-columns:1fr}
}