:root{--bg:#f4f6fa;--surface:#fff;--border:#e3e8ef;--text:#1f2933;--muted:#6b7785;--primary:#2563eb;--primary-dark:#1d4ed8;--danger:#dc2626;--ok:#047857;--warn:#b45309;--radius:12px}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;font-family:system-ui,-apple-system,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;font-size:15px;line-height:1.6}h1{margin:0;font-size:22px;font-weight:600}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}.muted{color:var(--muted)}.small{font-size:13px}.center{text-align:center}.boot{text-align:center;color:var(--muted);padding:80px 20px}.page{flex-direction:column;gap:16px;max-width:720px;margin:0 auto;padding:32px 20px 64px;display:flex}.page--narrow{max-width:420px;padding-top:64px}.hero{text-align:center;margin-bottom:8px}.hero p{margin:6px 0 0;font-size:13px}.topbar{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;display:flex}.topbar p{margin:2px 0 0}.userbox{align-items:center;gap:10px;display:flex}.userbox__meta{flex-direction:column;min-width:0;line-height:1.3;display:flex}.userbox__meta strong{white-space:nowrap;text-overflow:ellipsis;max-width:140px;font-weight:500;overflow:hidden}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);flex-direction:column;gap:14px;padding:20px;display:flex}.field{flex-direction:column;gap:6px;display:flex}.field span{color:var(--muted);font-size:13px}input[type=text],input[type=email],input[type=password],textarea{border:1px solid var(--border);width:100%;font:inherit;color:inherit;background:#fbfcfe;border-radius:8px;padding:10px 12px;transition:border-color .15s,box-shadow .15s}input:focus,textarea:focus{border-color:var(--primary);background:#fff;outline:none;box-shadow:0 0 0 3px #2563eb1f}textarea{resize:vertical;min-height:84px}.composer__foot{justify-content:space-between;align-items:center;display:flex}.btn{font:inherit;cursor:pointer;white-space:nowrap;border:1px solid #0000;border-radius:8px;justify-content:center;align-items:center;gap:6px;padding:9px 16px;font-size:14px;transition:background .15s,border-color .15s;display:inline-flex}.btn:disabled,.btn.is-disabled{opacity:.55;cursor:not-allowed}.btn--primary{background:var(--primary);color:#fff}.btn--primary:not(:disabled):hover{background:var(--primary-dark)}.btn--ghost{background:var(--surface);border-color:var(--border);color:var(--text)}.btn--ghost:not(.is-disabled):hover{border-color:#c8d1dc}.link{color:var(--danger);font:inherit;cursor:pointer;background:0 0;border:none;padding:0;font-size:13px}.link:hover{text-decoration:underline}.alert{border:1px solid var(--border);background:#eef2f7;border-radius:8px;margin:0;padding:10px 14px;font-size:14px}.alert--error{color:var(--danger);background:#fef2f2;border-color:#fecaca}.alert--ok{color:var(--ok);background:#ecfdf5;border-color:#a7f3d0}.alert--warn{color:var(--warn);background:#fffbeb;border-color:#fde68a}.avatar{object-fit:cover;background:#e8edf5;border-radius:50%;flex:none}.avatar--fallback{color:#2c4a86;-webkit-user-select:none;user-select:none;background:linear-gradient(135deg,#c7d7f5,#a9c1ee);border-radius:50%;justify-content:center;align-items:center;font-weight:600;display:inline-flex}.list{flex-direction:column;gap:12px;display:flex}.message{flex-direction:row;align-items:flex-start;gap:14px;padding:16px 18px}.message__body{flex:auto;min-width:0}.message__head{flex-wrap:wrap;align-items:baseline;gap:10px;display:flex}.message__head strong{font-weight:500}.message__text{white-space:pre-wrap;word-break:break-word;margin:6px 0 0}@media (width<=520px){.topbar{align-items:flex-start}.userbox{flex-wrap:wrap}}