:root{color-scheme:light;font-family:PingFang SC,Noto Sans SC,Microsoft YaHei,sans-serif;--bg: #f6f8fc;--surface: #ffffff;--surface-soft: #f7faff;--ink: #1f2937;--muted: #64748b;--line: #dbe4f2;--brand: #1d4ed8;--brand-weak: #dbeafe;--danger: #dc2626;--shadow: 0 18px 40px -24px rgba(15, 23, 42, .32)}*{box-sizing:border-box}body{margin:0;background:radial-gradient(circle at 0% 0%,rgba(37,99,235,.13),transparent 42%),radial-gradient(circle at 100% 0%,rgba(14,165,233,.12),transparent 36%),var(--bg);color:var(--ink);min-height:100vh}a{color:inherit;text-decoration:none}.expert-shell{min-height:100vh;display:flex;flex-direction:column}.expert-header{position:sticky;top:0;z-index:20;display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:16px;padding:14px 24px;border-bottom:1px solid 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#e2e8f0;background:#fff;color:#64748b;display:inline-flex;align-items:center;justify-content:center;flex-shrink:0}.expert-chat-avatar-fallback{background:#e0e7ff;color:#4338ca;border-color:#c7d2fe}.expert-chat-user-avatar{background:#eef2ff;color:#4338ca;border-color:#c7d2fe}.expert-chat-bubble{max-width:min(78%,720px);border-radius:16px;padding:10px 12px;box-shadow:0 6px 14px -12px #0f172a66}.expert-chat-bubble.is-ai{background:#fff;border:1px solid #dbe4f2;border-top-left-radius:6px;color:#1f2937}.expert-chat-bubble.is-user{background:#6c5ce7;color:#fff;border-top-right-radius:6px}.expert-chat-text{white-space:pre-wrap;word-break:break-word;line-height:1.55;font-size:13px}.expert-chat-current-tag{margin-top:8px;display:inline-flex;align-items:center;padding:2px 8px;border-radius:999px;font-size:11px;background:#ede9fe;color:#5b21b6}.expert-chat-meta{margin-top:8px;display:flex;flex-wrap:wrap;gap:6px;font-size:11px;color:#ffffffe6}.expert-chat-meta span{border:1px solid 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ease}.expert-chat-send:hover{background:#5b4cdb}.expert-chat-send:disabled{opacity:.45;cursor:not-allowed}@media(max-width:960px){.expert-header{grid-template-columns:1fr;align-items:stretch;gap:10px;padding:12px 14px}.expert-header-actions{justify-content:flex-start}.expert-content{padding:16px 12px 28px}.expert-page-head{flex-direction:column;align-items:stretch}.expert-page-actions{justify-content:flex-start}.grid.two,.grid.three,.upload-row{grid-template-columns:1fr}.expert-chat-scroll{max-height:62vh;min-height:280px}.expert-chat-bubble{max-width:86%}}