:root{--bg:#ffffff;--bg-soft:#f6f7f9;--text:#111827;--text-muted:#4b5563;--primary:#0ea5e9;--primary-dark:#0284c7;--card:#ffffff;--border:#e5e7eb}html{box-sizing:border-box}*,:after,:before{box-sizing:inherit}body{margin:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,Noto Sans,"Apple Color Emoji","Segoe UI Emoji";line-height:1.6}button,input{border-radius:10px}button{background:var(--primary);color:#fff;border:0;padding:10px 14px;cursor:pointer}button:hover{background:var(--primary-dark)}input{width:100%;padding:10px;border:1px solid var(--border);background:var(--card);color:var(--text)}