:root{color:#17202a;background:#f3f6f8;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Microsoft YaHei,sans-serif;font-synthesis:none;text-rendering:optimizeLegibility}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh}button,textarea{font:inherit}button{cursor:pointer}.app-shell{min-height:100vh;padding:28px;background:linear-gradient(135deg,rgba(17,96,128,.1),transparent 34%),linear-gradient(315deg,rgba(170,76,58,.1),transparent 36%),#f3f6f8}.workspace{display:grid;grid-template-rows:auto 1fr auto auto;width:min(1060px,100%);height:calc(100vh - 56px);min-height:620px;margin:0 auto;overflow:hidden;border:1px solid #d8e0e5;border-radius:8px;background:#ffffffeb;box-shadow:0 24px 70px #1a2b371f}.topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:22px 24px;border-bottom:1px solid #e4eaee;background:#fff}.top-actions{display:flex;align-items:center;gap:10px}.mode-button{min-width:92px;min-height:34px;padding:8px 12px;border:1px solid #cdd8df;border-radius:8px;color:#233746;background:#fff;font-size:13px;font-weight:800}.mode-button:hover{border-color:#247c73;color:#17645d}.mode-button:disabled{cursor:not-allowed;opacity:.55}.eyebrow{margin:0 0 6px;color:#64727c;font-size:12px;font-weight:700;letter-spacing:0;text-transform:uppercase}h1{margin:0;color:#17202a;font-size:24px;line-height:1.2}.status{display:inline-flex;align-items:center;gap:8px;min-width:max-content;padding:8px 11px;border:1px solid #b9d9c8;border-radius:999px;color:#1f6c44;background:#edf8f2;font-size:13px;font-weight:700}.status span{width:8px;height:8px;border-radius:999px;background:#20a45d}.status.mock{border-color:#f0d6a7;color:#8a5a12;background:#fff7e8}.status.mock span{background:#d48a18}.chat-panel{overflow-y:auto;padding:28px 24px 18px;background:linear-gradient(180deg,#ffffffb8,#f7fafcf0),radial-gradient(circle at top left,rgba(42,112,124,.07),transparent 28%)}.message-row{display:grid;grid-template-columns:38px minmax(0,1fr);gap:12px;max-width:860px;margin-bottom:18px}.message-row.user{grid-template-columns:minmax(0,1fr) 38px;margin-left:auto}.message-row.user .avatar{grid-column:2;grid-row:1;background:#27415b}.message-row.user .bubble{grid-column:1;justify-self:end;color:#fff;background:#27415b}.message-row.error .avatar,.message-row.error .bubble{background:#fff2f0;color:#9f2b1d}.message-row.error .avatar{border:1px solid #f2b7ae}.avatar{display:grid;place-items:center;width:38px;height:38px;border-radius:50%;color:#fff;background:#247c73;font-size:12px;font-weight:800}.bubble{width:fit-content;max-width:100%;padding:14px 16px;border-radius:8px;color:#1c2a34;background:#fff;box-shadow:0 10px 30px #23364214}.bubble pre{margin:0;white-space:pre-wrap;word-break:break-word;color:inherit;font-family:inherit;font-size:15px;line-height:1.72}.typing{display:inline-flex;align-items:center;gap:6px;min-height:48px}.typing i{width:7px;height:7px;border-radius:50%;background:#247c73;animation:pulse 1s infinite ease-in-out}.typing i:nth-child(2){animation-delay:.15s}.typing i:nth-child(3){animation-delay:.3s}.prompt-strip{display:flex;gap:10px;overflow-x:auto;padding:14px 24px;border-top:1px solid #e4eaee;background:#fbfcfd}.prompt-strip button{flex:0 0 auto;padding:8px 12px;border:1px solid #d2dde4;border-radius:999px;color:#304656;background:#fff;font-size:13px}.prompt-strip button:hover{border-color:#247c73;color:#17645d}.composer{display:grid;grid-template-columns:1fr auto;gap:12px;padding:16px 24px 22px;border-top:1px solid #e4eaee;background:#fff}.composer textarea{width:100%;min-height:48px;max-height:140px;resize:vertical;padding:13px 14px;border:1px solid #cdd8df;border-radius:8px;outline:none;color:#17202a;background:#f8fafb;line-height:1.5}.composer textarea:focus{border-color:#247c73;background:#fff;box-shadow:0 0 0 3px #247c731f}.composer button{width:92px;min-height:48px;border:0;border-radius:8px;color:#fff;background:#247c73;font-weight:800}.composer button:disabled{cursor:not-allowed;opacity:.55}@keyframes pulse{0%,80%,to{opacity:.3;transform:translateY(0)}40%{opacity:1;transform:translateY(-3px)}}@media(max-width:720px){.app-shell{padding:0}.workspace{width:100%;height:100vh;min-height:0;border:0;border-radius:0}.topbar{align-items:flex-start;padding:18px 16px}.top-actions{align-items:flex-end;flex-direction:column}h1{font-size:21px}.chat-panel{padding:20px 14px 12px}.message-row,.message-row.user{grid-template-columns:32px minmax(0,1fr);margin-left:0}.message-row.user .avatar{grid-column:1}.message-row.user .bubble{grid-column:2;justify-self:start}.avatar{width:32px;height:32px}.bubble{padding:12px 13px}.bubble pre{font-size:14px}.prompt-strip{padding:12px 14px}.composer{grid-template-columns:1fr;padding:12px 14px 16px}.composer button{width:100%}}