:root{--bg:#0b0d12;--card:#141821;--line:#232a36;--txt:#e7ecf3;--mut:#8b97a8;--acc:#4ade80}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--txt);font:16px/1.55 system-ui,-apple-system,Segoe UI,Inter,sans-serif}a{color:inherit}.wrap{max-width:1080px;margin:0 auto;padding:0 20px}header{border-bottom:1px solid var(--line)}header .wrap{display:flex;justify-content:space-between;align-items:center;height:60px}.logo{font-weight:800;text-decoration:none}.logo span{color:var(--acc)}.hero{padding:64px 0 32px}h1{font-size:clamp(30px,5vw,48px);line-height:1.1;margin:0 0 12px;letter-spacing:-.02em}.sub{color:var(--mut);font-size:18px;max-width:640px}.ctrl{display:flex;gap:10px;flex-wrap:wrap;margin:24px 0}input,select{background:var(--card);border:1px solid var(--line);color:var(--txt);padding:12px 14px;border-radius:10px;font-size:15px}input{flex:1 1;min-width:220px}.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));grid-gap:14px;gap:14px;margin-bottom:48px}.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px;text-decoration:none;display:block;transition:border-color .15s}a.card:hover{border-color:var(--acc)}.card h3{margin:0 0 4px;font-size:18px}.mut{font-size:14px}.mut,.tag{color:var(--mut)}.tag{display:inline-block;font-size:12px;padding:2px 8px;border-radius:99px;border:1px solid var(--line);margin-right:6px}.easy{color:#4ade80;border-color:#4ade8055}.medium{color:#facc15;border-color:#facc1555}.hard{color:#f87171;border-color:#f8717155}.stats{display:flex;gap:16px;margin:10px 0;font-size:14px}.box{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:22px;margin:24px 0}.news{display:flex;gap:10px;flex-wrap:wrap}button{background:var(--acc);color:#04120a;border:0;padding:12px 18px;border-radius:10px;font-weight:700;cursor:pointer}footer{border-top:1px solid var(--line);padding:24px 0;color:var(--mut);font-size:14px}.prompt{position:relative;margin-top:12px}.prompt pre{background:#0a0c10;border:1px solid var(--line);border-radius:10px;padding:16px;white-space:pre-wrap;font:13px/1.5 ui-monospace,Menlo,monospace;color:#cfd8e3;max-height:420px;overflow:auto}.copy{position:absolute;top:10px;right:10px;padding:8px 12px;font-size:13px}