:root{--main:#197b99;--accent:#0ea5a4;--bg:#f6f7fb;--card:#fff;--sol:#ecfdf5;--border:#b7e4d0;--text:#1f2937}
*{box-sizing:border-box} body{margin:0;background:var(--bg);font-family:"Amiri","Noto Naskh Arabic","Times New Roman",serif;color:var(--text);direction:rtl;line-height:2;font-size:20px}.page{max-width:900px;margin:24px auto;padding:16px}.card{background:var(--card);border-radius:18px;box-shadow:0 8px 30px rgba(0,0,0,.08);padding:32px}h1{margin:0 0 20px;text-align:center;color:var(--main);font-size:32px}.subtitle{text-align:center;color:#666;margin-top:-10px}.exercise{font-size:22px}.q{margin:.55rem 0}.math{direction:ltr;unicode-bidi:isolate;display:inline-block}.tbl{border-collapse:collapse;margin:16px auto;direction:ltr}.tbl td,.tbl th{border:2px solid #555;padding:10px 18px;text-align:center;min-width:78px}.btn{display:block;margin:24px 0 18px auto;background:var(--main);color:white;border:0;border-radius:10px;padding:11px 20px;font-size:18px;cursor:pointer}.solution{display:none;background:var(--sol);border-right:7px solid #10b981;border-radius:14px;padding:24px;margin-top:14px;overflow-x:auto}.solution.show{display:block}.solution h2{margin-top:0;color:#111}.step{margin:.7rem 0}.note{color:#777;font-size:16px;text-align:center;margin-top:22px}.wide{overflow-x:auto}mjx-container{direction:ltr;unicode-bidi:isolate;max-width:100%;overflow-x:auto;overflow-y:hidden} .ltr{direction:ltr;unicode-bidi:isolate;display:inline-block} @media(max-width:600px){body{font-size:18px}.page{padding:10px;margin:8px auto}.card{padding:20px 14px;border-radius:14px}h1{font-size:27px}.exercise{font-size:19px}.tbl td,.tbl th{padding:8px 10px;min-width:50px}.solution{padding:18px 12px}.btn{font-size:16px}}