:root{--color-text: #2c3e50;--color-muted: #7f8c8d;--color-bg: #f5f7fa;--color-surface: #ffffff;--color-border: #e0e0e0;--color-primary: #1976d2;--color-danger: #e74c3c;--color-success: #27ae60}*,*:before,*:after{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Hiragino Kaku Gothic ProN,Hiragino Sans,Meiryo,sans-serif;font-size:14px;color:var(--color-text);background:var(--color-bg);& a{color:var(--color-primary);&:hover{text-decoration:underline}}}button{font-family:inherit}