:root{--blue:#1769ff;--navy:#10233f;--yellow:#ffd43b;--bg:#f4f8ff;--card:#fff;--muted:#667085}*{box-sizing:border-box}body{margin:0;font-family:Arial,Helvetica,sans-serif;background:var(--bg);color:var(--navy)}button,input,select{font:inherit}.topbar{display:flex;align-items:center;justify-content:space-between;padding:14px 22px;background:#fff;border-bottom:1px solid #dfe7f3;position:sticky;top:0;z-index:10}.brand{font-weight:900;font-size:24px;color:var(--blue)}.nav{display:flex;gap:8px;flex-wrap:wrap}.nav button,.btn{border:0;border-radius:14px;padding:11px 16px;cursor:pointer;font-weight:700}.nav button{background:#eef4ff;color:var(--navy)}.btn-primary{background:var(--blue);color:#fff}.btn-yellow{background:var(--yellow);color:#20263a}.container{max-width:1120px;margin:auto;padding:28px 18px}.hero{display:grid;grid-template-columns:1.2fr .8fr;gap:24px;align-items:center}.hero h1{font-size:clamp(42px,7vw,78px);line-height:.95;margin:0 0 18px}.hero p{font-size:19px;color:var(--muted)}.mascot{background:linear-gradient(145deg,#1769ff,#6ea2ff);border-radius:36px;min-height:340px;display:flex;align-items:center;justify-content:center;font-size:120px;box-shadow:0 18px 45px #1769ff33}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:24px}.panel{background:#fff;border-radius:22px;padding:22px;box-shadow:0 8px 25px #10233f12}.panel h3{margin-top:0}.flash-wrap{max-width:720px;margin:20px auto;text-align:center}.flashcard{background:#fff;border-radius:34px;min-height:390px;padding:28px;display:flex;flex-direction:column;justify-content:center;align-items:center;box-shadow:0 18px 55px #10233f1f;border:5px solid #eaf1ff}.equation{font-size:clamp(64px,13vw,130px);font-weight:900}.visual{font-size:120px}.prompt{font-size:28px;font-weight:800;margin:18px 0}.status{min-height:30px;font-weight:800}.controls{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:16px}.manual{width:160px;padding:13px;border:2px solid #cddaf0;border-radius:14px;text-align:center}.timer{font-size:34px;font-weight:900}.score{font-size:54px;font-weight:900;color:var(--blue)}.stars{font-size:48px}.statrow{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.stat{text-align:center;background:#f7faff;border-radius:16px;padding:14px}.stat strong{display:block;font-size:26px}.table{width:100%;border-collapse:collapse}.table th,.table td{text-align:left;padding:12px;border-bottom:1px solid #e7edf7}.badge{display:inline-block;background:#eaf1ff;border-radius:999px;padding:6px 10px;font-weight:700}.small{color:var(--muted);font-size:14px}@media(max-width:800px){.hero{grid-template-columns:1fr}.grid{grid-template-columns:1fr}.statrow{grid-template-columns:repeat(2,1fr)}.mascot{min-height:220px}.topbar{align-items:flex-start;gap:10px;flex-direction:column}}