:root{--color-primary: #2563eb;--color-primary-hover: #1d4ed8;--color-bg: #f8fafc;--color-surface: #ffffff;--color-border: #e2e8f0;--color-text: #1e293b;--color-text-secondary: #64748b;--color-success: #10b981;--color-warning: #f59e0b;--color-error: #ef4444;--radius: 8px;--shadow-sm: 0 1px 2px rgba(0,0,0,.05);--shadow-md: 0 4px 6px -1px rgba(0,0,0,.1)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--color-bg);color:var(--color-text);line-height:1.6}.app-container{min-height:100vh;display:flex;flex-direction:column}.app-header{background:var(--color-surface);border-bottom:1px solid var(--color-border);padding:0 24px;height:60px;display:flex;align-items:center;justify-content:space-between;box-shadow:var(--shadow-sm)}.header-brand{display:flex;align-items:center;gap:10px}.brand-icon{font-size:24px}.header-brand 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