*{margin:0;padding:0;box-sizing:border-box}:root{--primary: #4f46e5;--primary-light: #818cf8;--primary-dark: #3730a3;--accent: #f05a28;--accent-glow: rgba(240,90,40,.15);--bg: #ffffff;--bg-chat: #f8fafb;--surface: #ffffff;--text: #1e293b;--text-secondary: #64748b;--text-muted: #94a3b8;--border: #e2e8f0;--shadow-sm: 0 1px 2px rgba(0,0,0,.04);--shadow: 0 2px 8px rgba(0,0,0,.06);--shadow-lg: 0 8px 30px rgba(0,0,0,.1);--radius: 6px;--radius-lg: 10px;--transition: .18s ease}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Noto Sans HK,Roboto,sans-serif;background:var(--bg);color:var(--text);min-height:100vh;height:100dvh;min-height:100dvh;-webkit-font-smoothing:antialiased}#app{max-width:780px;margin:0 auto;height:100vh;height:100dvh;display:flex;flex-direction:column;background:var(--surface);box-shadow:var(--shadow-lg)}.chat-header{background:#fff;color:var(--text);border-bottom:1px solid var(--border);padding:18px 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.18s ease,transform .18s ease}.btn-login:hover{opacity:.92;transform:translateY(-1px)}.btn-login:disabled{opacity:.55;cursor:not-allowed;transform:none}.error-msg{color:var(--accent);font-size:13px;margin-top:6px;min-height:20px}.back-link{display:block;text-align:center;margin-top:18px;color:#64748b;font-size:13px;text-decoration:none;transition:color .18s ease}.back-link:hover{color:var(--primary)}.agent-layout{display:flex;min-height:100vh;height:100dvh;min-height:100dvh}.agent-sidebar{width:230px;background:#fff;color:var(--text);border-right:1px solid var(--border);padding:24px 0;flex-shrink:0;display:flex;flex-direction:column;position:sticky;top:0;height:100vh;height:100dvh;overflow-y:auto}.agent-sidebar h2{padding:0 22px;font-size:15px;margin-bottom:28px;font-weight:600;letter-spacing:.02em;opacity:.9}.agent-sidebar .user-info{padding:0 22px 18px;border-bottom:1px solid var(--border);margin-bottom:20px;font-size:13px}.agent-sidebar .user-info 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