:root{--primary: #4f46e5;--primary-light: #818cf8;--primary-dark: #3730a3;--success: #10b981;--warning: #f59e0b;--danger: #ef4444;--info: #3b82f6;--bg: #f1f5f9;--bg-card: #ffffff;--text: #1e293b;--text-secondary: #64748b;--border: #e2e8f0;--shadow: 0 1px 3px rgba(0,0,0,.1);--shadow-lg: 0 4px 12px rgba(0,0,0,.1);--radius: 8px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}.btn{display:inline-flex;align-items:center;gap:6px;padding:8px 18px;border:none;border-radius:var(--radius);cursor:pointer;font-size:14px;font-weight:500;transition:all 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