:root{--bg-primary: #ffffff;--bg-secondary: #f5f5f7;--bg-tertiary: #e8e8ed;--text-primary: #1d1d1f;--text-secondary: #86868b;--text-tertiary: #a1a1a6;--accent-blue: #0071e3;--accent-blue-hover: #0077ed;--success: #34c759;--warning: #ff9500;--error: #ff3b30;--border: rgba(0, 0, 0, .08);--shadow-sm: 0 2px 8px rgba(0, 0, 0, .04);--shadow-md: 0 4px 20px rgba(0, 0, 0, .08);--radius-sm: 12px;--radius-md: 16px;--radius-lg: 20px}*{box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,SF Pro Display,SF Pro Text,Helvetica Neue,PingFang SC,sans-serif;background-color:var(--bg-secondary);color:var(--text-primary);line-height:1.5;-webkit-font-smoothing:antialiased}.app-container{max-width:980px;margin:0 auto;padding:20px;min-height:100vh}.app-header{display:flex;justify-content:space-between;align-items:center;padding:16px 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