:root{--primary: #1f6f43;--primary-dark: #185334;--bg: #f5f6f4;--card: #ffffff;--border: #d9deda;--text: #212b25;--muted: #5d6b62;--danger: #b3261e;--pass: #1f6f43;--fail: #b3261e}*{box-sizing:border-box}body{margin:0;font-family:Microsoft YaHei,PingFang SC,Noto Sans CJK SC,system-ui,sans-serif;background:var(--bg);color:var(--text);font-size:15px}.app{max-width:1080px;margin:0 auto;padding:24px 20px 60px}.app-header{text-align:center;margin-bottom:20px}.app-header h1{margin:0 0 4px;font-size:26px;color:var(--primary-dark)}.subtitle{color:var(--muted);margin:0 0 14px}.steps{display:flex;justify-content:center;gap:28px;list-style:none;padding:0;margin:0;color:var(--muted)}.steps li.active{color:var(--primary);font-weight:700;border-bottom:2px solid var(--primary);padding-bottom:4px}.card{background:var(--card);border:1px solid var(--border);border-radius:10px;padding:24px 28px;box-shadow:0 1px 3px #0000000d}.card h2{margin-top:0;color:var(--primary-dark)}.card h3{margin:14px 0 8px}.card h4{margin:18px 0 8px}.field{margin-bottom:14px;display:flex;flex-direction:column;gap:4px;max-width:420px}.field label{font-weight:600}.field input,.field select{padding:8px 10px;border:1px solid var(--border);border-radius:6px;font-size:15px}.hint{color:var(--muted);font-size:13px;margin:2px 0 0}.errors,.tips{color:var(--danger)}ul.errors{color:var(--danger);padding-left:20px}.error-text{color:var(--danger);font-weight:600}.actions{margin-top:18px;display:flex;gap:12px}button{padding:9px 18px;border-radius:6px;border:1px solid var(--border);background:#fff;cursor:pointer;font-size:15px}button.primary{background:var(--primary);color:#fff;border-color:var(--primary)}button.primary:disabled{opacity:.6;cursor:not-allowed}button.link{border:none;background:none;color:var(--primary);text-decoration:underline;padding:0}.feed-table,.result-table{width:100%;border-collapse:collapse;margin:10px 0 16px}.feed-table th,.feed-table td,.result-table th,.result-table td{border:1px solid var(--border);padding:7px 9px;text-align:left}.feed-table th,.result-table th{background:#eef2ef}.feed-table input[type=number]{width:110px;padding:5px 7px;border:1px solid var(--border);border-radius:5px}.tag{display:inline-block;font-size:11px;background:#f3e8c6;color:#7a5c00;border-radius:4px;padding:1px 5px;margin-left:6px}.override-row td{background:#fafbfa}.override-grid{display:grid;grid-template-columns:repeat(3,minmax(180px,1fr));gap:8px 18px}.override-grid .field{max-width:none;margin-bottom:6px}.override-grid input{width:100%}.pass{color:var(--pass);font-weight:700}.fail{color:var(--fail);font-weight:700}.infeasible{background:#fdf0ef;border:1px solid #f0c4c0;border-radius:8px;padding:14px 18px}.infeasible h3{margin-top:0;color:var(--danger)}.advice{font-weight:600}.ai-box{border-top:1px dashed var(--border);margin-top:20px;padding-top:14px}.approximate-warning{background:#fdf3e3;border:1px solid #e6b93d;border-radius:8px;padding:12px 16px;margin-bottom:14px}.approximate-warning h3{margin:0 0 6px;color:#7a5c00}.approximate-warning p{margin:6px 0 0}ul.unmet{color:var(--danger);padding-left:20px}.app-footer{text-align:center;color:var(--muted);font-size:13px;margin-top:28px}