:root{--bg:#f4f7fb;--panel:#fff;--line:#dde5f0;--text:#1f2937;--muted:#526075;--blue:#3157b7;--blue-dark:#1f3c88;--green:#22c55e;--shadow:0 6px 18px rgba(31,41,55,.06)}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif}.app-shell{width:min(1180px,calc(100vw - 28px));margin:10px auto}.hero{padding:14px 18px;border-radius:14px;color:#fff;background:linear-gradient(135deg,var(--blue-dark),var(--blue));box-shadow:0 8px 22px rgba(31,60,136,.16)}.hero h1{margin:0 0 4px;font-size:24px}.hero p{margin:0;color:rgba(255,255,255,.92);font-size:13px}.workspace{display:grid;grid-template-columns:minmax(0,3fr) minmax(250px,1fr);gap:12px;margin-top:10px}.case-card,.chat-card,.help-card,.result-card{border:1px solid var(--line);border-radius:14px;background:var(--panel);box-shadow:var(--shadow)}.case-card,.help-card,.result-card{padding:12px 14px}.case-label{color:#4267aa;font-size:11px;font-weight:700;letter-spacing:.1em}.case-card h2{margin:6px 0;font-size:18px}.case-card p,.help-card p{margin:0;color:var(--muted);font-size:14px;line-height:1.55}.help-card p+p{margin-top:12px}.chat-card{margin-top:10px;overflow:hidden}.chat-title{padding:10px 14px;border-bottom:1px solid var(--line);color:#44536a;font-size:14px;font-weight:700}.chat-window{height:345px;overflow-y:auto;padding:14px;background:#fbfcfe}.message{max-width:82%;margin:8px 0;padding:10px 12px;border-radius:12px;font-size:14px;line-height:1.55;white-space:pre-wrap;word-break:break-word}.assistant-message{margin-right:auto;border:1px solid #e2e8f0;background:#fff}.user-message{margin-left:auto;border:1px solid #c9dbff;background:#eaf2ff}.pending-message{color:#6b7a90;font-style:italic}.question-header{display:flex;justify-content:space-between;gap:12px;margin:10px 2px 6px;color:#38465a;font-size:14px}.question-header strong{color:#526075}.composer input{width:100%;min-height:43px;padding:0 13px;border:1px solid #cfd9e8;border-radius:10px;outline:none;background:#fff;font-size:14px}.composer input:focus{border-color:#7ea2ef;box-shadow:0 0 0 3px rgba(49,87,183,.1)}.buttons{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:8px;margin-top:8px}button{min-height:40px;border:1px solid #d9e1ec;border-radius:9px;background:#fff;color:#314159;cursor:pointer;font-size:14px;font-weight:700}button.primary{border-color:var(--blue);background:var(--blue);color:#fff}button:disabled{cursor:not-allowed;opacity:.55}.model-row{display:flex;align-items:center;gap:7px;margin-top:12px;padding-top:10px;border-top:1px solid #e6ebf2;color:#66758b;font-size:13px}.online-dot{width:9px;height:9px;border-radius:50%;background:var(--green);box-shadow:0 0 0 3px rgba(34,197,94,.14)}#result-panel{margin-top:10px}.result-card{display:flex;gap:12px;align-items:flex-start;font-size:14px}.result-card h3{margin:0 0 6px;font-size:18px}.result-card p{margin:3px 0;line-height:1.5}.result-icon{font-size:24px}.success-card{border-color:#7bd3a6;background:#ecfdf5}.giveup-card{border-color:#efc46d;background:#fffbeb}.timeout-card{border-color:#c6cfdb;background:#f8fafc}.error-card{border-color:#f0a3a3;background:#fff1f2}code{padding:2px 5px;border-radius:5px;background:#f0f3f8}@media(max-width:820px){.workspace{grid-template-columns:1fr}.chat-window{height:300px}.side-column{display:flex;flex-direction:column;gap:10px}#result-panel{margin-top:0}}