:root{color-scheme:light;--bg: #f4f5f7;--surface: #ffffff;--sidebar: #1d2433;--sidebar-muted: #8a93a6;--sidebar-hover: #2a3447;--text: #1c2230;--text-muted: #6b7280;--border: #e3e6ec;--primary: #3b6ef5;--primary-dark: #2f59c9;--danger: #d64545;--success: #1f8a5b;--warning: #a86a10;--radius: 10px;--shadow: 0 1px 2px rgba(20, 28, 45, .06), 0 8px 24px rgba(20, 28, 45, .05)}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;font-size:14px;line-height:1.5}h1,h2{margin:0;font-weight:600}h1{font-size:22px}h2{font-size:15px}code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:12px}.layout{display:grid;grid-template-columns:232px minmax(0,1fr);min-height:100%}.sidebar{display:flex;flex-direction:column;gap:24px;padding:24px 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var(--border);word-break:break-word;line-height:1.5}.chat-msg.mine .chat-msg-bubble{background:var(--primary);color:#fff;border-color:var(--primary)}.chat-msg-time{font-size:11px;color:var(--text-muted);margin-top:4px}.chat-input{display:flex;gap:10px;padding:14px 20px;border-top:1px solid var(--border);background:var(--surface)}.chat-input textarea{flex:1;resize:none;padding:10px 12px;border:1px solid var(--border);border-radius:var(--radius);font-family:inherit;font-size:14px;outline:none}.chat-input textarea:focus{border-color:var(--primary)}.chat-placeholder{flex:1;display:flex;align-items:center;justify-content:center;color:var(--text-muted);font-size:14px}.chat-error{padding:8px 20px;background:#d645451a;color:var(--danger);font-size:13px;border-top:1px solid var(--border)}.video-call-float{position:fixed;right:24px;bottom:24px;width:360px;background:#000;border-radius:12px;box-shadow:0 8px 32px 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