:root{
  --bg:#f6faf8;--panel:#ffffff;--soft:#eef7f4;--text:#172522;--muted:#6e827c;
  --line:#d9e8e3;--accent:#0aa892;--accent2:#54d786;--shadow:0 16px 45px rgba(23,37,34,.10);
}
*{box-sizing:border-box}html,body{height:100%}body{margin:0;background:linear-gradient(180deg,#f8fffc,#eef7f4);color:var(--text);font:16px/1.55 "DejaVu Sans","Segoe UI",sans-serif;overflow:hidden}button,textarea,select{font:inherit}.app{height:100vh;width:min(1500px,96vw);margin:0 auto;display:flex;flex-direction:column;min-height:0}.topbar{height:74px;display:flex;align-items:center;justify-content:space-between;gap:18px;border-bottom:1px solid var(--line);flex:0 0 auto}.brand{display:flex;align-items:center;gap:13px;min-width:0}.logo,.empty-logo{display:grid;place-items:center;background:linear-gradient(135deg,var(--accent),var(--accent2));color:white;font-weight:900;box-shadow:0 10px 28px rgba(10,168,146,.22)}.logo{width:44px;height:44px;border-radius:14px}.brand h1{margin:0;font-size:1.18rem;letter-spacing:-.03em}.brand p{margin:1px 0 0;color:var(--muted);font-size:.86rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.brand code{color:#247b70}.top-actions{display:flex;align-items:center;gap:10px}.top-actions button,.top-actions select,.chips button{border:1px solid var(--line);background:var(--panel);color:var(--text);border-radius:12px;padding:9px 12px;cursor:pointer}.top-actions button:hover,.chips button:hover{border-color:#9fd8cf;background:#fafffd}.switch{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:.9rem;cursor:pointer}.switch input{display:none}.switch span{width:36px;height:21px;border-radius:999px;background:#c9d9d4;position:relative}.switch span:before{content:"";position:absolute;width:15px;height:15px;top:3px;left:3px;border-radius:50%;background:white;transition:.16s}.switch input:checked+span{background:var(--accent)}.switch input:checked+span:before{transform:translateX(15px)}.messages{flex:1 1 auto;min-height:0;overflow:auto;padding:28px 4vw 18px;display:flex;flex-direction:column;gap:18px;scroll-behavior:smooth}.empty-state{margin:auto;max-width:780px;text-align:center}.empty-logo{width:64px;height:64px;border-radius:20px;margin:0 auto 18px}.empty-state h2{font-size:2.6rem;line-height:1;margin:0 0 12px;letter-spacing:-.06em}.empty-state p{margin:0 auto;color:var(--muted);max-width:640px}.chips{margin-top:24px;display:flex;gap:10px;flex-wrap:wrap;justify-content:center}.message{width:100%;display:flex}.message.user{justify-content:flex-end}.message.assistant{justify-content:flex-start}.message.user .bubble{background:#e7f7f2;border-color:#bde7dc;max-width:min(860px,78%)}.message.assistant .bubble{background:var(--panel);width:min(1120px,88vw);max-width:88vw}.bubble{border:1px solid var(--line);border-radius:22px;padding:16px 18px;box-shadow:0 6px 22px rgba(23,37,34,.06);white-space:pre-wrap;overflow-wrap:anywhere}.message-meta{display:flex;align-items:center;gap:10px;margin-bottom:10px;color:var(--muted);font-size:.88rem}.message-meta strong{color:var(--text)}.copy{margin-left:auto;border:1px solid var(--line);background:#fafdfc;border-radius:10px;padding:5px 9px;color:var(--muted);cursor:pointer}.answer{font-size:1rem;color:var(--text)}.answer p{margin:.25rem 0 .85rem}.answer pre{background:#10201d;color:#eafff8;border-radius:14px;padding:14px;overflow:auto;white-space:pre}.answer code{font-family:"DejaVu Sans Mono","Consolas",monospace}.actions{margin-top:12px;border-top:1px solid var(--line);padding-top:10px;color:var(--muted);font-size:.9rem}.action-ok{color:#087c67}.action-bad{color:#c33}.composer{flex:0 0 auto;padding:14px 4vw 22px;background:linear-gradient(180deg,rgba(246,250,248,0),rgba(246,250,248,.95) 26%,#f6faf8)}.input-card{display:flex;align-items:flex-end;gap:12px;background:var(--panel);border:1px solid #bcded6;border-radius:24px;padding:12px 12px 12px 18px;box-shadow:var(--shadow)}.input-card:focus-within{border-color:var(--accent);box-shadow:0 0 0 4px rgba(10,168,146,.10),var(--shadow)}textarea{flex:1;min-height:38px;max-height:170px;resize:none;border:0;outline:0;background:transparent;color:var(--text);padding:8px 0;font-size:1rem}#sendBtn{border:0;border-radius:17px;padding:12px 20px;background:linear-gradient(135deg,var(--accent),var(--accent2));color:white;font-weight:850;cursor:pointer}#sendBtn:disabled{opacity:.55;cursor:not-allowed}.subline{display:flex;justify-content:space-between;color:var(--muted);font-size:.8rem;padding:8px 8px 0}.hidden{display:none!important}@media(max-width:760px){body{overflow:hidden}.app{width:100vw}.topbar{height:auto;min-height:70px;padding:10px 12px}.brand p{display:none}.top-actions select{display:none}.top-actions button{padding:8px 10px}.switch{font-size:.8rem}.messages{padding:18px 12px 10px}.empty-state h2{font-size:2rem}.message.user .bubble,.message.assistant .bubble{max-width:94%}.composer{padding:10px 12px 14px}.input-card{border-radius:20px}.chips{display:none}}

.thinking-panel{margin:4px 0 14px;border:1px solid var(--line);background:#f8fcfa;border-radius:16px;overflow:hidden}
.thinking-panel summary{cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:12px;padding:10px 12px;color:#667a74;font-size:.9rem;list-style:none}
.thinking-panel summary::-webkit-details-marker{display:none}
.thinking-panel summary span{font-weight:750;color:#465a54}
.thinking-panel summary em{font-style:normal;color:#8aa098;font-size:.78rem}
.thinking-text{margin:0;padding:0 12px 12px;max-height:260px;overflow:auto;white-space:pre-wrap;color:#6e7f7a;font:13px/1.55 "DejaVu Sans Mono","Consolas",monospace}
.thinking-panel:not([open]) .thinking-text{display:none}

.thinking-panel{background:rgba(248,252,250,.72);backdrop-filter:blur(8px);transition:opacity .28s ease, transform .28s ease, background .28s ease}
.thinking-panel.thinking-live{background:rgba(238,247,244,.78);animation:thinkingBreath 1.45s ease-in-out infinite}
.thinking-panel.thinking-done{opacity:.72}
.thinking-panel.thinking-done:hover,.thinking-panel[open]{opacity:1}
.thinking-panel.thinking-live summary span:after{content:"";display:inline-block;width:1.2em;text-align:left;animation:thinkingDots 1.2s steps(4,end) infinite}
@keyframes thinkingBreath{0%,100%{box-shadow:0 0 0 rgba(10,168,146,0);transform:translateY(0)}50%{box-shadow:0 10px 24px rgba(10,168,146,.08);transform:translateY(-1px)}}
@keyframes thinkingDots{0%{content:""}25%{content:"."}50%{content:".."}75%,100%{content:"..."}}


.working-line{color:var(--muted);animation:softPulse 1.2s ease-in-out infinite}
@keyframes softPulse{0%,100%{opacity:.45}50%{opacity:1}}
.actions:empty{display:none}
.actions{font-size:.86rem;color:#55736b}
.action-ok,.action-bad{border-left:3px solid currentColor;padding:7px 0 7px 10px;margin-top:8px}
@media(max-width:760px){.message.assistant .bubble{width:94%;max-width:94%}.message.user .bubble{max-width:94%}}