:root{--primary: #1976D2;--primary-dark: #1565C0;--primary-light: #42A5F5;--success: #4CAF50;--danger: #E53935;--warning: #FF9800;--bg: #f5f5f5;--surface: #ffffff;--text: #212121;--text-secondary: #757575;--text-hint: #BDBDBD;--border: #e0e0e0;--divider: #eeeeee;--radius: 12px;--radius-sm: 8px}.loading-screen{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:100vh;color:var(--text-secondary)}.spinner{width:32px;height:32px;border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite;margin-bottom:12px}@keyframes spin{to{transform:rotate(360deg)}}.shell{display:flex;min-height:100vh}.sidebar{width:240px;background:var(--primary);color:#fff;padding:24px 0;display:flex;flex-direction:column;position:fixed;top:0;left:0;bottom:0;z-index:10}.sidebar-header{padding:0 20px 20px;border-bottom:1px solid rgba(255,255,255,.15);margin-bottom:8px}.sidebar-header 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