:root{color-scheme:light;--bg: #f2f7ff;--ink: #13223b;--accent: #00a878;--card: #ffffff}*{box-sizing:border-box}body{margin:0;font-family:Avenir Next,Trebuchet MS,sans-serif;color:var(--ink);background:radial-gradient(circle at 20% 10%,#d9ebff,var(--bg))}.shell{max-width:900px;margin:0 auto;padding:1rem}.hero{display:flex;justify-content:space-between;align-items:center;gap:1rem}button{border:0;border-radius:999px;padding:.6rem 1rem;background:var(--accent);color:#fff;font-weight:700}.grid{list-style:none;display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:.8rem;padding:0}.card{background:var(--card);border-radius:14px;padding:.9rem;box-shadow:0 8px 24px #13223b14}.score{font-size:2rem;font-weight:800;margin:.2rem 0 0}.error{color:#a31937}