:root{--fg:#1a1a1a;--bg:#fafafa;--primary:#0066cc;--border:#e0e0e0;--muted:#666;--ok:#16a34a;--bad:#dc2626}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Helvetica Neue,PingFang TC,sans-serif;background:var(--bg);color:var(--fg);line-height:1.6}.container{max-width:960px;margin:0 auto;padding:16px}.header{background:white;border-bottom:1px solid var(--border)}.header .container{display:flex;align-items:center;gap:24px}.header .brand{font-weight:700;font-size:1.1em;color:var(--fg);text-decoration:none}.header nav a{margin-right:16px;color:var(--muted);text-decoration:none}.header nav a:hover{color:var(--primary)}footer{text-align:center;color:var(--muted);padding:24px 0}.card{background:white;border:1px solid var(--border);border-radius:8px;padding:16px;margin-bottom:16px}button,input,textarea{font:inherit}button{background:var(--primary);color:white;border:0;padding:8px 16px;border-radius:6px;cursor:pointer}button:disabled{background:#999;cursor:not-allowed}input,textarea{width:100%;padding:8px;border:1px solid var(--border);border-radius:6px;background:white}.status-grid{display:grid;grid-template-columns:repeat(3,1fr);grid-gap:12px;gap:12px}.status-grid .card{text-align:center}.dot{display:inline-block;width:10px;height:10px;border-radius:50%;margin-right:6px}.dot.ok{background:var(--ok)}.dot.bad{background:var(--bad)}.chat-log{max-height:400px;overflow-y:auto;padding:8px;border:1px solid var(--border);border-radius:6px;background:#fff}.chat-log .row{padding:6px 0;border-bottom:1px solid var(--border)}.chat-log .row.user{color:var(--primary)}.chat-log .row.bot{color:var(--fg)}.chat-log .row.error{color:var(--bad)}.muted{color:var(--muted);font-size:.9em}