:root{--bg: #f7f8fa;--panel: #ffffff;--border: #e4e7ec;--text: #1f2329;--muted: #8a9099;--accent: #2563eb;--accent-soft: #eef2ff;--user-bg: #eef2ff;--radius: 10px;font-family:system-ui,-apple-system,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--text)}.app{display:flex;flex-direction:column;height:100vh}.topbar{display:flex;align-items:center;justify-content:space-between;padding:10px 16px;background:var(--panel);border-bottom:1px solid var(--border)}.brand{font-weight:600;font-size:15px}.settings{display:flex;gap:8px}.input-key,.input-model{border:1px solid var(--border);border-radius:8px;padding:6px 10px;font-size:13px;background:var(--bg)}.input-key{width:240px}.input-model{width:140px}.input-base-url{border:1px solid var(--border);border-radius:8px;padding:6px 10px;font-size:13px;background:var(--bg);width:280px}.main{flex:1;display:grid;grid-template-columns:1.4fr 1fr;gap:0;min-height:0}.canvas-pane{position:relative;background:var(--panel);border-right:1px solid var(--border);display:flex;flex-direction:column}.canvas-status{position:absolute;top:8px;left:12px;z-index:5;font-size:12px;color:var(--muted);background:#fffc;padding:2px 8px;border-radius:6px}.ggb-container{flex:1;min-height:0}.chat-pane{display:flex;flex-direction:column;min-height:0;background:var(--bg)}.messages{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:14px}.empty{color:var(--muted);font-size:13px;text-align:center;margin-top:40px;line-height:1.8}.msg{max-width:92%}.msg.user{align-self:flex-end}.msg-role{font-size:11px;color:var(--muted);margin-bottom:4px}.msg.user .msg-role{text-align:right}.msg.user .markdown{background:var(--user-bg);border:1px solid #dbe4ff}.msg.assistant .markdown{background:var(--panel);border:1px solid var(--border)}.markdown{padding:10px 12px;border-radius:var(--radius);font-size:14px;line-height:1.65;word-break:break-word}.markdown :where(p){margin:6px 0}.markdown :where(code){background:#0000000f;padding:1px 4px;border-radius:4px;font-size:13px}.markdown :where(pre){background:#1f2329;color:#e6e6e6;padding:10px;border-radius:8px;overflow-x:auto}.activity{display:flex;flex-wrap:wrap;gap:4px;margin:4px 0}.chip{font-size:11px;color:var(--muted);background:var(--panel);border:1px solid var(--border);border-radius:6px;padding:1px 6px}.composer{border-top:1px solid var(--border);background:var(--panel);padding:10px;display:flex;gap:8px}.composer textarea{flex:1;resize:none;height:64px;border:1px solid var(--border);border-radius:8px;padding:8px 10px;font-family:inherit;font-size:14px;background:var(--bg)}.send{border:none;background:var(--accent);color:#fff;border-radius:8px;padding:0 18px;font-size:14px;cursor:pointer}.send:disabled{opacity:.5;cursor:not-allowed}