:root{--bg:#f6f4ef;--panel:#ffffff;--border:#e4e0d8;--text:#2b2a33;--muted:#7a7785;--accent:#8fb3a9;--accent-2:#7aa69b;--accent-ink:#1f3a34;--user:#e9f0ec;--radius:14px;--danger:#d98b8b;--ok:#9fcfae;--peach:#f5d9c6;--lilac:#dcd6ee}
@media(prefers-color-scheme:dark){:root{--bg:#1c1c22;--panel:#24242c;--border:#34343e;--text:#ecebf0;--muted:#a3a1ad;--user:#2c3a36;--accent:#8fb3a9;--accent-2:#a3c4bb;--accent-ink:#13241f;--peach:#5a4538;--lilac:#3e3952}}
*{box-sizing:border-box}html,body{height:100%;margin:0}[hidden]{display:none!important}
body{font:15px/1.5 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;background:var(--bg);color:var(--text)}
button,input,textarea,select{font:inherit;color:inherit}
a{color:var(--accent)}
.muted{color:var(--muted)}.small{font-size:13px}.pad{padding:8px 10px}.grow{flex:1}.error{color:var(--danger)}
.app{display:grid;grid-template-columns:270px 1fr auto;height:100dvh;overflow:hidden}
/* sidebar */
.sidebar{display:flex;flex-direction:column;gap:12px;padding:14px;background:var(--panel);border-right:1px solid var(--border);overflow:hidden}
.sb-head{display:flex;align-items:center;justify-content:space-between}
.logo{font-weight:700;letter-spacing:.2px;display:flex;align-items:center;gap:8px}.logo-dot{width:12px;height:12px;border-radius:50%;background:var(--accent);display:inline-block}
.sb-section{display:flex;flex-direction:column;gap:4px;min-height:0}.sb-section.grow{flex:1}.sb-title{font-size:12px;text-transform:uppercase;letter-spacing:.6px;color:var(--muted);display:flex;justify-content:space-between;align-items:center;padding:4px 6px}
.list{overflow:auto;display:flex;flex-direction:column;gap:2px}
.item{display:flex;align-items:center;gap:8px;padding:8px 10px;border-radius:10px;cursor:pointer;color:inherit}.item:hover{background:var(--bg)}.item.active{background:var(--user)}
.item .t{flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.item .t small{display:block;color:var(--muted);font-size:12px}.item .ic{flex:none}
.item .mini{opacity:0}.item:hover .mini{opacity:1}
.mini{border:0;background:transparent;cursor:pointer;color:var(--muted);padding:2px 6px;border-radius:6px}.mini:hover{background:var(--border);color:var(--text)}
.sb-foot{display:flex;flex-direction:column;gap:6px;border-top:1px solid var(--border);padding-top:10px}
.user{display:flex;align-items:center;gap:8px;font-weight:600}.user img{width:28px;height:28px;border-radius:50%}
.link{border:0;background:none;color:var(--accent);cursor:pointer;padding:2px 0;text-align:left;display:inline-flex;align-items:center;gap:6px}
.dot{width:9px;height:9px;border-radius:50%;background:#bbb;display:inline-block}.dot.on{background:var(--ok)}
.btn{border:1px solid var(--border);background:var(--panel);border-radius:10px;padding:8px 14px;cursor:pointer;text-decoration:none;display:inline-flex;align-items:center;gap:6px}.btn:hover{border-color:var(--accent)}
.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}.btn.primary:hover{background:var(--accent-2)}.btn.danger{color:var(--danger)}.btn.wide{width:100%;justify-content:center}
.icon-btn{border:0;background:transparent;cursor:pointer;font-size:17px;padding:6px 8px;border-radius:8px;color:var(--muted)}.icon-btn:hover{background:var(--bg);color:var(--text)}
/* main */
.main{display:flex;flex-direction:column;min-width:0;height:100dvh}
.top{display:flex;align-items:center;gap:8px;padding:10px 14px;border-bottom:1px solid var(--border);background:var(--panel)}
.crumbs{flex:1;min-width:0;display:flex;align-items:center;gap:8px}.crumb{font-size:12px;background:var(--lilac);padding:2px 8px;border-radius:999px;white-space:nowrap}.crumb-title{font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.model-btn{border:1px solid var(--border);background:var(--bg);border-radius:999px;padding:6px 12px;cursor:pointer;font-weight:600;white-space:nowrap}.model-btn:hover{border-color:var(--accent)}
.messages{flex:1;overflow:auto;padding:20px 0;scroll-behavior:smooth}
.empty{max-width:640px;margin:14vh auto 0;text-align:center;padding:0 20px}.empty h2{font-size:28px;margin:0 0 8px}.chips{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;margin-top:20px}
.chip{border:1px solid var(--border);background:var(--peach);border-radius:999px;padding:8px 14px;cursor:pointer}.chip:hover{border-color:var(--accent)}
.msg{max-width:820px;margin:0 auto 18px;padding:0 20px;display:flex;gap:12px}
.msg.user{justify-content:flex-end}.msg.user .bubble{background:var(--user);padding:10px 14px;border-radius:var(--radius);max-width:80%;white-space:pre-wrap;word-break:break-word}
.msg .att{display:block;max-width:260px;max-height:260px;border-radius:8px;margin-bottom:6px}
.msg.assistant .avatar{flex:none;width:30px;height:30px;border-radius:50%;background:var(--peach);color:var(--accent-ink);display:flex;align-items:center;justify-content:center;font-size:14px}
.msg.assistant .body{min-width:0;flex:1}.msg.streaming .md::after{content:"▍";animation:blink 1s infinite;color:var(--accent)}@keyframes blink{50%{opacity:0}}
.md{word-break:break-word}.md>:first-child{margin-top:0}.md>:last-child{margin-bottom:0}.md pre{background:var(--panel);border:1px solid var(--border);padding:12px;border-radius:10px;overflow:auto}.md code{background:var(--panel);padding:1px 5px;border-radius:5px;font-size:.92em}.md pre code{background:none;padding:0}.md table{border-collapse:collapse}.md td,.md th{border:1px solid var(--border);padding:5px 10px}.md img{max-width:100%}
.action{display:inline-flex;gap:8px;align-items:center;margin-top:8px;padding:6px 12px;border:1px dashed var(--border);border-radius:10px;color:var(--muted);font-size:14px}
.doc-card{display:flex;gap:10px;align-items:center;margin:10px 0;padding:10px 14px;border:1px solid var(--border);border-radius:12px;background:var(--panel);cursor:pointer}.doc-card:hover{border-color:var(--accent)}.doc-card .ic{font-size:22px}
.msg.tool{display:block}.tool-res{margin-left:42px;font-size:13px;color:var(--muted)}.tool-res summary{cursor:pointer}.tool-res pre{white-space:pre-wrap;max-height:300px;overflow:auto;background:var(--panel);border:1px solid var(--border);padding:8px;border-radius:8px}.tool-res .shot{display:block;max-width:100%;border:1px solid var(--border);border-radius:8px;margin-top:6px}
.composer{padding:10px 20px 14px;background:var(--bg)}
.composer-box{max-width:820px;margin:0 auto;display:flex;align-items:flex-end;gap:6px;background:var(--panel);border:1px solid var(--border);border-radius:18px;padding:8px 8px 8px 6px}.composer-box:focus-within{border-color:var(--accent)}
.composer textarea{flex:1;border:0;background:transparent;resize:none;outline:none;padding:8px 4px;max-height:220px;line-height:1.45}
.send{border:0;width:38px;height:38px;border-radius:12px;background:var(--accent);color:var(--accent-ink);cursor:pointer;font-size:16px}.send:hover{background:var(--accent-2)}.send.stop{background:var(--danger);color:#fff}
.hint{text-align:center;color:var(--muted);font-size:12px;margin-top:6px}
.attach-preview{max-width:820px;margin:0 auto 6px;display:flex;align-items:flex-start;gap:4px}.attach-preview img{max-height:90px;border-radius:8px;border:1px solid var(--border)}
/* right panel */
.panel{width:0;overflow:hidden;background:var(--panel);border-left:1px solid var(--border);display:flex;flex-direction:column;gap:10px;transition:width .2s}.panel.open{width:300px;padding:14px}
.panel-head{display:flex;align-items:center;justify-content:space-between}.panel-sub{font-size:12px;text-transform:uppercase;letter-spacing:.6px;color:var(--muted);display:flex;justify-content:space-between;align-items:center;margin-top:6px}
.panel-text{font-size:13px;color:var(--muted);white-space:pre-wrap;max-height:160px;overflow:auto}
/* modals */
.modal{position:fixed;inset:0;background:rgba(43,42,51,.35);display:flex;align-items:center;justify-content:center;padding:16px;z-index:50}
.modal-card{background:var(--panel);border-radius:16px;width:min(520px,100%);max-height:92dvh;overflow:auto;padding:18px;display:flex;flex-direction:column;gap:12px;border:1px solid var(--border)}.modal-card.wide{width:min(760px,100%)}.modal-card.doc{height:92dvh}
.modal-head{display:flex;align-items:center;justify-content:space-between;gap:10px}
.modal input,.modal textarea,.modal select{width:100%;border:1px solid var(--border);background:var(--bg);border-radius:10px;padding:9px 12px;outline:none}.modal input:focus,.modal textarea:focus{border-color:var(--accent)}
.modal label{display:flex;flex-direction:column;gap:4px;font-size:13px;color:var(--muted)}.modal form{display:flex;flex-direction:column;gap:10px}
.row{display:flex;gap:8px;align-items:center;flex-wrap:wrap}.col{display:flex;flex-direction:column;gap:8px}.row input{flex:1}
.model-list{display:flex;flex-direction:column;gap:4px;max-height:50dvh;overflow:auto}.model{display:flex;justify-content:space-between;align-items:center;gap:8px;padding:8px 10px;border-radius:10px;cursor:pointer;border:1px solid transparent}.model:hover{background:var(--bg)}.model.active{border-color:var(--accent)}
.tag{font-size:11px;background:var(--lilac);padding:1px 7px;border-radius:999px;margin-left:6px}
.title-input{font-weight:700;font-size:17px}.doc-toolbar{display:flex;gap:6px;flex-wrap:wrap;align-items:center}.doc-view{flex:1;overflow:auto;padding:4px 2px}.doc-editor{flex:1;min-height:50dvh;font-family:ui-monospace,Menlo,monospace;font-size:13px}
.steps{padding-left:20px;display:flex;flex-direction:column;gap:6px;font-size:14px}code{background:var(--bg);padding:1px 5px;border-radius:5px}
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:var(--accent-ink);color:#fff;padding:10px 16px;border-radius:10px;z-index:100;font-size:14px}
/* login */
.login-body{display:flex;align-items:center;justify-content:center;padding:16px}
.login-card{background:var(--panel);border:1px solid var(--border);border-radius:20px;padding:36px 32px;width:min(440px,100%);display:flex;flex-direction:column;gap:14px;text-align:center}.login-card h1{margin:4px 0 0;font-size:26px}
.btn-yandex{display:flex;align-items:center;justify-content:center;gap:10px;background:#2b2a33;color:#fff;border-radius:12px;padding:12px;text-decoration:none;font-weight:600}.btn-yandex.disabled{opacity:.4;pointer-events:none}
.divider{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:12px}.divider::before,.divider::after{content:"";flex:1;height:1px;background:var(--border)}
.login-card form{display:flex;flex-direction:column;gap:8px}.login-card input{border:1px solid var(--border);background:var(--bg);border-radius:10px;padding:10px 12px;outline:none}
/* mobile */
@media(max-width:900px){
  .app{grid-template-columns:1fr}
  .sidebar{position:fixed;inset:0 auto 0 0;width:min(300px,85vw);z-index:40;transform:translateX(-100%);transition:transform .2s}.sidebar.open{transform:none;border-right:1px solid var(--border)}
  .panel{position:fixed;inset:0 0 0 auto;z-index:40}.panel.open{width:min(340px,90vw)}
  .item .mini{opacity:1}.msg.user .bubble{max-width:92%}
}
@media(min-width:901px){#sb-open,#sb-close{display:none}}