:root{--bg-primary: #1a1a2e;--bg-secondary: #16213e;--bg-tertiary: #0f3460;--text-primary: #eaeaea;--text-secondary: #a0a0a0;--accent-primary: #e94560;--accent-secondary: #533483;--border-color: #2a2a4a;--success: #4caf50;--warning: #ff9800;--error: #f44336}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background-color:var(--bg-primary);color:var(--text-primary);line-height:1.6;min-height:100vh}.app{display:flex;flex-direction:column;min-height:100vh}.app-header{background:linear-gradient(135deg,var(--bg-secondary),var(--bg-tertiary));padding:1.5rem 2rem;text-align:center;border-bottom:2px solid var(--accent-primary)}.app-header h1{font-size:2rem;margin-bottom:.25rem;color:var(--accent-primary)}.app-header .subtitle{color:var(--text-secondary);font-size:1rem}.app-main{display:grid;grid-template-columns:400px 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