:root{--blue:#0866d6;--navy:#0a1f38;--ink:#172033;--muted:#667085;--bg:#f5f8fc;--card:#fff;--line:#dce4ee}
*{box-sizing:border-box}body{margin:0;font-family:Inter,Segoe UI,Arial,sans-serif;background:var(--bg);color:var(--ink)}
header{background:#fff;padding:18px 20px;border-bottom:1px solid var(--line)}
.brand{max-width:980px;margin:auto;display:flex;align-items:center;justify-content:center}
.brand-logo{display:block;width:min(420px,90vw);height:auto;max-height:115px;object-fit:contain}
main{max-width:980px;margin:42px auto;padding:0 20px}.hero{text-align:center;margin-bottom:28px}.hero h2{font-size:34px;margin:0 0 12px}.hero p{color:var(--muted);font-size:17px;max-width:700px;margin:auto;line-height:1.5}
.grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:25px;box-shadow:0 8px 25px rgba(20,43,80,.06)}
.card h3{margin-top:0;font-size:22px}.card p{color:var(--muted);line-height:1.5}.badge{display:inline-block;background:#eaf3ff;color:#075bb8;border-radius:999px;padding:5px 9px;font-size:12px;font-weight:700}
label{display:block;font-weight:650;margin:14px 0 6px}textarea,input,select{width:100%;padding:12px 13px;border:1px solid #cbd5e1;border-radius:9px;font:inherit;background:white}textarea{min-height:125px;resize:vertical}
button,.button{display:inline-block;border:0;border-radius:9px;padding:12px 16px;background:var(--blue);color:white;font-weight:700;cursor:pointer;text-decoration:none;margin-top:14px}
button.secondary{background:#eef3f8;color:#26394f}.result{margin-top:16px;padding:14px;background:#eff8ff;border:1px solid #bfe0ff;border-radius:10px;word-break:break-all}.warn{background:#fff8e6;border-color:#f1d48a}.error{color:#b42318;font-weight:650}
.secret{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;white-space:pre-wrap;word-break:break-word;background:#0e1726;color:#f8fafc;padding:18px;border-radius:12px;font-size:16px}
footer{text-align:center;color:#7b8798;padding:30px 20px;font-size:13px}.hidden{display:none}
@media(max-width:760px){.grid{grid-template-columns:1fr}.hero h2{font-size:28px}.brand-logo{max-height:90px}}