:root{--bg:#f7f8fc;--panel:#fff;--text:#172033;--muted:#697386;--line:#e6e9f0;--accent:#5967e8;--accent-soft:#eef0ff;--user:#e9edff}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,sans-serif}button,textarea{font:inherit}button{cursor:pointer}.shell{display:flex;min-height:100vh}.sidebar{width:272px;padding:24px 16px;background:var(--panel);border-right:1px solid var(--line);display:flex;flex-direction:column;gap:22px}.brand{display:flex;align-items:center;gap:10px;padding:0 10px;font-weight:800;letter-spacing:-.03em;font-size:20px}.brand-mark{display:grid;place-items:center;width:32px;height:32px;border-radius:11px;color:#fff;background:linear-gradient(135deg,#7b8cff,#4f54c9);box-shadow:0 7px 18px #5967e833}.new-chat{border:0;border-radius:13px;padding:12px 15px;background:var(--accent-soft);color:#4651bd;text-align:left;font-weight:700}.history-title{color:var(--muted);font-size:12px;font-weight:800;text-transform:uppercase;letter-spacing:.1em;padding:0 10px}.history{display:flex;flex-direction:column;gap:4px;overflow:auto}.history-item{border:0;background:transparent;color:var(--text);border-radius:9px;padding:10px;text-align:left;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.history-item:hover{background:#f2f4f9}.settings{margin-top:auto;border:1px solid var(--line);border-radius:13px;padding:12px;color:var(--muted);background:#fbfbfd;font-size:13px}.main{flex:1 1;display:flex;flex-direction:column;min-width:0}.topbar{height:70px;padding:0 32px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);background:#ffffffaa;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.topbar h1{font-size:15px;margin:0}.status{font-size:12px;color:var(--muted);display:flex;gap:7px;align-items:center}.dot{width:8px;height:8px;border-radius:50%;background:#4dc38a}.chat{width:min(860px,100%);flex:1 1;margin:0 auto;padding:48px 28px 26px;display:flex;flex-direction:column}.welcome{margin:auto 0;padding-bottom:80px}.eyebrow{color:var(--accent);font-size:13px;font-weight:800;letter-spacing:.08em;text-transform:uppercase}.welcome h2{font-size:clamp(34px,5vw,56px);line-height:1.05;letter-spacing:-.06em;margin:14px 0;max-width:650px}.welcome p{color:var(--muted);max-width:510px;line-height:1.7}.messages{display:flex;flex-direction:column;gap:22px;padding-bottom:24px}.message{display:flex;gap:12px;align-items:flex-start}.message.user{justify-content:flex-end}.bubble{max-width:min(720px,85%);padding:14px 17px;border-radius:18px;line-height:1.65;white-space:pre-wrap;overflow-wrap:anywhere}.assistant .bubble{background:var(--panel);border:1px solid var(--line);border-top-left-radius:5px}.user .bubble{background:var(--user);border-top-right-radius:5px}.avatar{flex:0 0 30px;height:30px;border-radius:10px;display:grid;place-items:center;font-size:12px;font-weight:800;color:#fff;background:var(--accent)}.composer-wrap{margin-top:auto}.error{margin-bottom:10px;color:#b4233c;background:#fff0f2;border:1px solid #ffd3da;border-radius:11px;padding:10px 13px;font-size:13px}.composer{display:flex;gap:10px;align-items:flex-end;padding:10px;background:var(--panel);border:1px solid #dfe3ed;border-radius:18px;box-shadow:0 8px 30px #2e3d6512}textarea{resize:none;flex:1 1;min-height:42px;max-height:150px;border:0;outline:0;padding:10px 8px;background:transparent;color:var(--text)}.send{border:0;width:42px;height:42px;border-radius:13px;color:#fff;background:var(--accent);font-size:18px}.send:disabled{opacity:.45;cursor:not-allowed}.hint{color:var(--muted);font-size:11px;padding:8px 5px 0;text-align:center}@media(max-width:700px){.sidebar{width:68px;padding:18px 10px;align-items:center}.brand span,.history,.history-title,.settings{display:none}.new-chat{width:44px;height:44px;padding:0;text-align:center;font-size:0}.new-chat:after{content:"+";font-size:24px}.topbar{padding:0 18px}.chat{padding:28px 16px 18px}.welcome{padding-bottom:45px}}.message-link{color:#365bd6;text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:2px;overflow-wrap:anywhere}.message-link:hover{color:#233da2}.file-input{display:none}.attach{width:42px;height:42px;border-radius:13px;display:grid;place-items:center;color:var(--muted);font-size:25px;cursor:pointer}.attach:hover{background:var(--accent-soft);color:var(--accent)}.attachments{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:8px}.attachment{display:inline-flex;align-items:center;gap:6px;padding:7px 10px;border:1px solid var(--line);border-radius:10px;background:var(--panel);font-size:12px;color:var(--muted)}.attachment button{border:0;background:transparent;color:var(--muted);font-size:17px;line-height:1;padding:0 0 0 3px}