:root{--bg-canvas: #f8fafc;--bg-surface: #ffffff;--bg-subtle: #f1f5f9;--border: #e2e8f0;--border-strong: #cbd5e1;--text-primary: #0f172a;--text-secondary: #475569;--text-muted: #64748b;--accent: #2563eb;--accent-hover: #1d4ed8;--accent-soft: #eff6ff;--danger: #dc2626;--danger-soft: #fef2f2;--danger-border: #fecaca;--success: #15803d;--success-soft: #f0fdf4;--radius-md: 8px;--radius-lg: 12px;--shadow-xs: 0 1px 2px rgba(15, 23, 42, .04)}*,*:before,*:after{box-sizing:border-box}html,body{margin:0;padding:0;background-color:var(--bg-canvas);color:var(--text-primary);font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;font-size:15px;line-height:1.5;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button,input{font:inherit}.app-shell{min-height:100vh;display:flex;flex-direction:column;background-color:var(--bg-canvas);overflow-x:clip}.app-header{background-color:var(--bg-surface);border-bottom:1px solid 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