:root{--bg:#f5f7fb;--surface:#fff;--ink:#0f1c33;--muted:#56637a;--line:#dde3ee;--accent:#2453f5;--accent-ink:#fff;--accent-soft:#e6ecff;--mark:#f2b23b;--ok:#1f9d63;--bad:#c0392b;--r:12px;
--f:"Instrument Sans","Segoe UI",system-ui,sans-serif;--fd:"Bricolage Grotesque","Segoe UI",system-ui,sans-serif;--fm:"JetBrains Mono",ui-monospace,Consolas,monospace}
@media(prefers-color-scheme:dark){:root{--bg:#0b1322;--surface:#121d31;--ink:#e9eefa;--muted:#9aa7c0;--line:#22314d;--accent:#5b80ff;--accent-ink:#06102a;--accent-soft:#18264a;--ok:#3cc487;--bad:#ff8a7a;color-scheme:dark}}
*{box-sizing:border-box}html,body{height:100%}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.5 var(--f)}
h1,h2,h3{font-family:var(--fd);margin:0;letter-spacing:-.02em;line-height:1.1}
a{color:var(--accent)}button,input,textarea,select{font:inherit;color:inherit}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;font-weight:600;padding:.6rem 1.1rem;border-radius:999px;border:1.5px solid var(--ink);background:transparent;cursor:pointer;text-decoration:none;white-space:nowrap}
.btn.primary{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.btn.sm{padding:.35rem .8rem;font-size:.85rem}.btn:disabled{opacity:.5;cursor:not-allowed}
.btn:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible,a:focus-visible{outline:3px solid var(--mark);outline-offset:2px}
input,textarea,select{width:100%;padding:.65rem .8rem;border:1px solid var(--line);border-radius:10px;background:var(--surface)}
label{display:block;font:500 .72rem var(--fm);letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin:0 0 4px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:20px}
.center{min-height:100%;display:grid;place-items:center;padding:20px}
.login{width:100%;max-width:400px;display:grid;gap:14px}
.logo{font-family:var(--fd);font-weight:800;font-size:1.25rem;display:flex;gap:.5rem;align-items:center}
.logo i{width:24px;height:24px;border-radius:6px;background:var(--accent);color:var(--accent-ink);display:grid;place-items:center;font-style:normal;font-size:.8rem}
.err{color:var(--bad);font-size:.92rem;min-height:1.3em}.ok{color:var(--ok)}.muted{color:var(--muted);font-size:.92rem}
/* app shell */
.shell{display:grid;grid-template-rows:auto 1fr;height:100vh;height:100dvh}
.top{display:flex;gap:10px;align-items:center;flex-wrap:wrap;padding:10px 14px;border-bottom:1px solid var(--line);background:var(--surface)}
.top .sp{flex:1}.top select{width:auto;max-width:220px}
.main{display:grid;grid-template-columns:380px 1fr;min-height:0}
.chat{display:grid;grid-template-rows:1fr auto;border-right:1px solid var(--line);min-height:0;background:var(--surface)}
.log{overflow:auto;padding:14px;display:flex;flex-direction:column;gap:10px}
.msg{max-width:92%;padding:10px 13px;border-radius:12px;font-size:.95rem;white-space:pre-wrap;word-break:break-word}
.msg.u{align-self:flex-end;background:var(--accent);color:var(--accent-ink);border-bottom-right-radius:4px}
.msg.a{align-self:flex-start;background:var(--bg);border:1px solid var(--line);border-bottom-left-radius:4px}
.msg.sys{align-self:center;color:var(--muted);font-size:.85rem;background:none}
.compose{padding:12px;border-top:1px solid var(--line);display:grid;gap:8px}
.compose textarea{min-height:84px;resize:vertical}
.row{display:flex;gap:8px;align-items:center;justify-content:space-between;flex-wrap:wrap}
.prev{display:grid;grid-template-rows:auto 1fr;min-height:0;min-width:0}
.prev .bar{display:flex;gap:8px;align-items:center;padding:8px 12px;border-bottom:1px solid var(--line);flex-wrap:wrap}
.prev iframe{width:100%;height:100%;border:0;background:#fff}
.url{font:.8rem var(--fm);color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;flex:1;min-width:120px}
.tabs{display:none}
.spin{width:14px;height:14px;border:2px solid var(--line);border-top-color:var(--accent);border-radius:50%;display:inline-block;animation:sp 1s linear infinite;vertical-align:-2px;margin-right:6px}
@keyframes sp{to{transform:rotate(360deg)}}
dialog{border:1px solid var(--line);border-radius:var(--r);background:var(--surface);color:var(--ink);max-width:560px;width:calc(100% - 32px);padding:20px}
dialog::backdrop{background:rgba(11,20,36,.5)}
table{width:100%;border-collapse:collapse;font-size:.92rem}th,td{text-align:left;padding:8px 10px;border-bottom:1px solid var(--line);vertical-align:top}
th{font:500 .7rem var(--fm);letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.wrap{max-width:980px;margin:0 auto;padding:20px;display:grid;gap:18px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
code,.mono{font-family:var(--fm);font-size:.88rem;background:var(--accent-soft);padding:2px 6px;border-radius:6px;word-break:break-all}
@media(max-width:820px){
 .main{grid-template-columns:1fr;grid-template-rows:auto 1fr}
 .tabs{display:flex;border-bottom:1px solid var(--line);background:var(--surface)}
 .tabs button{flex:1;padding:10px;border:0;background:none;font-weight:600;border-bottom:3px solid transparent;cursor:pointer}
 .tabs button[aria-selected=true]{border-color:var(--accent);color:var(--accent)}
 .chat{border-right:0}.main[data-tab=chat] .prev,.main[data-tab=prev] .chat{display:none}
 .grid2{grid-template-columns:1fr}}
@media(prefers-reduced-motion:reduce){*{animation:none!important}}