:root{--bg:#f6f7f9;--panel:#fff;--panel-soft:#f1f4f8;--text:#18202d;--muted:#667085;--line:#d8dee8;--primary:#176b87;--primary-strong:#0f5065;--accent:#c4752d;--ok:#16835c;--danger:#b42318}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:Arial,PingFang SC,Microsoft YaHei,sans-serif}button,input,select,textarea{font:inherit}.app-shell{display:grid;grid-template-columns:244px 1fr;min-height:100vh}.sidebar{background:#111827;color:#f9fafb;padding:20px 16px}.brand{display:flex;flex-direction:column;gap:4px;padding:4px 8px 24px}.brand-title{font-size:18px;font-weight:700}.brand-subtitle{color:#b7c0d1;font-size:12px}.nav{display:grid;grid-gap:4px;gap:4px}.nav-item{display:flex;align-items:center;gap:10px;width:100%;height:40px;border:0;border-radius:6px;background:transparent;color:#d7deea;cursor:pointer;padding:0 10px;text-align:left}.nav-item.active,.nav-item:hover{background:#233044;color:#fff}.main{display:grid;grid-template-rows:64px 1fr;min-width:0}.topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;border-bottom:1px solid var(--line);background:var(--panel);padding:0 24px}.topbar h1{margin:0;font-size:20px}.user-pill{display:flex;align-items:center;gap:8px;color:var(--muted);font-size:14px}.content{padding:24px;overflow:auto}.grid{display:grid;grid-gap:16px;gap:16px}.grid.cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}.panel{background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:16px}.panel h2{margin:0 0 12px;font-size:16px}.detail-panel{display:grid;grid-gap:20px;gap:20px}.detail-section{overflow-x:auto}.detail-section h3{margin:0 0 10px;font-size:14px}.metric{display:flex;align-items:baseline;justify-content:space-between;gap:12px}.metric strong{font-size:28px}.muted{color:var(--muted)}.toolbar{display:flex;justify-content:space-between;margin-bottom:12px}.button,.toolbar{gap:8px;align-items:center}.button{display:inline-flex;justify-content:center;min-height:36px;border:1px solid var(--line);border-radius:6px;background:var(--panel);color:var(--text);cursor:pointer;padding:0 12px}.button.primary{border-color:var(--primary);background:var(--primary);color:#fff}.button.primary:hover{background:var(--primary-strong)}.input,.select,.textarea{width:100%;border:1px solid var(--line);border-radius:6px;background:#fff;color:var(--text);padding:9px 10px}.textarea{min-height:112px;resize:vertical}.form-grid{display:grid;grid-gap:10px;gap:10px}.filter-bar{display:grid;grid-template-columns:minmax(220px,2fr) repeat(4,minmax(130px,1fr)) auto;grid-gap:10px;gap:10px;align-items:center}.session-layout{display:grid;grid-template-columns:minmax(280px,.8fr) minmax(0,1.6fr);grid-gap:16px;gap:16px}.message-list,.session-list{display:grid;grid-gap:10px;gap:10px}.session-row{display:flex;align-items:center;gap:8px;border-bottom:1px solid var(--line);padding-bottom:10px}.session-open{display:grid;flex:1 1;grid-gap:4px;gap:4px;border:0;background:transparent;color:var(--text);cursor:pointer;text-align:left}.message{display:grid;grid-gap:8px;gap:8px;border-left:3px solid var(--line);background:var(--panel-soft);padding:12px}.message.assistant{border-left-color:var(--primary)}.message.user{border-left-color:var(--accent)}.reference-detail{margin:0;overflow:auto;color:var(--muted);font-size:12px;white-space:pre-wrap}.table{width:100%;border-collapse:collapse;font-size:14px}.panel{overflow-x:auto}.table td,.table th{border-bottom:1px solid var(--line);padding:10px 8px;text-align:left;vertical-align:top;max-width:360px;overflow-wrap:anywhere}.table th{font-weight:600}.table th,.tag{color:var(--muted)}.tag{display:inline-flex;align-items:center;min-height:24px;border-radius:4px;background:var(--panel-soft);padding:0 8px;font-size:12px}.login-page{min-height:100vh;display:grid;place-items:center;padding:24px}.login-box{width:min(420px,100%);background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:24px}.login-box h1{margin:0 0 8px;font-size:22px}.login-box p{margin:0 0 20px;color:var(--muted)}.error{color:var(--danger);font-size:14px}@media (max-width:900px){.app-shell{grid-template-columns:1fr}.sidebar{position:-webkit-sticky;position:sticky;top:0;z-index:10}.nav{grid-template-columns:repeat(3,minmax(0,1fr))}.filter-bar,.grid.cols-3,.session-layout{grid-template-columns:1fr}}