:root{--primary: #007AFF;--primary-hover: #0063CC;--bg: #F5F7FA;--card-bg: #FFFFFF;--text-main: #1D1D1F;--text-secondary: #86868B;--border: #D2D2D7;--success: #34C759;--error: #FF3B30;--warning: #FF9500;--radius: 12px}*{box-sizing:border-box;margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background-color:var(--bg);color:var(--text-main);line-height:1.5;-webkit-font-smoothing:antialiased}button{cursor:pointer;border:none;font:inherit;transition:all .2s ease}input,textarea{font:inherit;border:1px solid var(--border);border-radius:8px;padding:10px 14px}.container{max-width:800px;margin:0 auto;padding:20px}.card{background:var(--card-bg);border-radius:var(--radius);box-shadow:0 4px 12px #0000000d;padding:24px}