:root{--bg-primary:#fff;--bg-secondary:#f5f5f7;--text-primary:#1d1d1f;--text-secondary:#86868b;--accent:#06c;--border:#d2d2d7;--shadow-sm:0 2px 8px rgba(0,0,0,.08);--shadow-md:0 4px 16px rgba(0,0,0,.12);--shadow-lg:0 8px 32px rgba(0,0,0,.16);--transition:0.2s ease-out}*{margin:0;padding:0;box-sizing:border-box}body,html{font-family:-apple-system,BlinkMacSystemFont,SF Pro Display,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;background:var(--bg-primary);color:var(--text-primary);line-height:1.5;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button{font-family:inherit;cursor:pointer;border:none;background:none}img{max-width:100%;height:auto}