:root{--bg:#0b0c10;--panel:#12141a;--border:#232834;--text:#e9ecf1;--muted:#a7afbe}
*{box-sizing:border-box}
body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:var(--bg);color:var(--text)}
.topbar{display:flex;align-items:center;justify-content:space-between;padding:10px 12px;border-bottom:1px solid var(--border);background:var(--panel)}
.brand{font-weight:800;letter-spacing:.2px}
.top-actions{display:flex;gap:8px;align-items:center}
.btn{border:1px solid var(--border);background:#1a1f2b;color:var(--text);padding:8px 10px;border-radius:10px;cursor:pointer;font-size:13px;text-decoration:none}
.btn:hover{filter:brightness(1.08)}
.btn-ghost{background:transparent}
.app{display:grid;grid-template-columns:340px 1fr;height:calc(100vh - 52px)}
.sidebar{border-right:1px solid var(--border);background:#0f1117;padding:10px;display:flex;flex-direction:column;gap:10px}
.search{width:100%;padding:10px;border-radius:10px;border:1px solid var(--border);background:#0b0c10;color:var(--text)}
.small{color:var(--muted);font-size:12px}
.list{overflow:auto;flex:1}
.conv{width:100%;text-align:left;border:1px solid var(--border);background:#12141a;color:var(--text);
  padding:10px;border-radius:12px;margin-bottom:8px;cursor:pointer}
.conv.active{outline:2px solid #3b82f6}
.conv-title{font-weight:700;font-size:13px;margin-bottom:4px}
.conv-meta{color:var(--muted);font-size:12px}
.main{background:#0b0c10;display:flex;flex-direction:column}
.header{padding:12px;border-bottom:1px solid var(--border);background:#0f1117}
.h-title{font-weight:800}
.h-sub{color:var(--muted);font-size:12px;margin-top:4px}
.empty{padding:18px}
.card{border:1px solid var(--border);background:#0f1117;border-radius:16px;padding:16px;max-width:620px}
.card h2{margin:0 0 6px 0}
.card p{margin:0;color:var(--muted)}
.chat{flex:1;overflow:auto;padding:12px;position:relative}
.loading{position:sticky;top:0;background:#0f1117;border:1px solid var(--border);border-radius:12px;padding:10px;margin-bottom:10px;color:var(--muted)}
.msg{border:1px solid var(--border);background:#0f1117;border-radius:14px;padding:12px;margin-bottom:10px}
.msg-head{display:flex;justify-content:space-between;gap:10px;margin-bottom:8px}
.badge{font-weight:800;font-size:12px}
.time{color:var(--muted);font-size:12px}
pre{white-space:pre-wrap;word-wrap:break-word;margin:0;font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;font-size:12.5px;color:var(--text)}