:root{--color-background:#f8fafc;--color-text:#0f172a;--color-text-secondary:#475569;--color-text-muted:#64748b;--color-accent:#0f766e;--color-border:#e2e8f0;--font-family-base:Arial,"Apple SD Gothic Neo","Malgun Gothic",sans-serif}*,:after,:before{box-sizing:border-box}body,h1,h2,h3,p{margin:0}button,input,select,textarea{font:inherit}html{color-scheme:light;background:var(--color-background);color:var(--color-text);font-family:var(--font-family-base);line-height:1.5}body{min-width:320px}