:root{--bg:#f8fafc;--card:#fff;--text:#0f172a;--muted:#64748b;--border:#e5e7eb;--primary:#2563eb;--primary2:#1d4ed8;--soft:#eff6ff}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:Arial,Helvetica,sans-serif;line-height:1.7}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}.wrap{max-width:1160px;margin:auto;padding:0 18px}.topbar{background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:10}.nav{min-height:72px;display:flex;align-items:center;justify-content:space-between;gap:16px}.brand{font-weight:900;font-size:25px;color:#0f172a}.brand span{color:var(--primary)}nav{display:flex;gap:16px;flex-wrap:wrap}nav a{font-weight:700;color:#334155}.hero{padding:58px 0 34px}.hero h1{font-size:48px;line-height:1.08;margin:0 0 14px}.hero p{font-size:18px;color:var(--muted);max-width:820px}.btn{display:inline-block;background:var(--primary);color:#fff;padding:12px 18px;border:0;border-radius:13px;font-weight:800;cursor:pointer}.btn:hover{background:var(--primary2);color:#fff;text-decoration:none}.btn.secondary{background:#fff;color:#0f172a;border:1px solid var(--border)}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(245px,1fr));gap:18px;margin:24px 0 42px}.card{background:var(--card);border:1px solid var(--border);border-radius:18px;padding:22px;box-shadow:0 10px 30px rgba(15,23,42,.05)}.card h2,.card h3{margin-top:0}.badge{display:inline-block;background:var(--soft);color:var(--primary);border-radius:999px;padding:4px 10px;font-size:12px;font-weight:900;margin-bottom:10px}.article{background:#fff;border:1px solid var(--border);border-radius:20px;padding:30px;margin:28px 0}.article h1{font-size:38px;line-height:1.15}.article h2{font-size:26px;margin-top:34px}.article p,.article li{color:#334155}.post p{font-size:17px}.toolbox{background:#f8fafc;border:1px solid var(--border);border-radius:18px;padding:18px;margin:20px 0}textarea,input,select{width:100%;padding:12px;border:1px solid var(--border);border-radius:12px;font-size:16px;background:#fff;margin:7px 0}textarea{min-height:145px}.row{display:grid;grid-template-columns:1fr 1fr;gap:12px}.result{background:#0f172a;color:#fff;border-radius:14px;padding:16px;margin-top:14px;white-space:pre-wrap;overflow:auto}.footer{border-top:1px solid var(--border);background:#fff;margin-top:50px;padding:28px 0;color:#475569}.links{display:flex;gap:16px;flex-wrap:wrap;margin-top:8px}@media(max-width:700px){.hero h1{font-size:34px}.row{grid-template-columns:1fr}.nav{align-items:flex-start;flex-direction:column;padding:14px 0}.article{padding:20px}}