:root{--bg:#0f172a;--ink:#0f172a;--muted:#64748b;--line:#e2e8f0;--brand:#2563eb;}
*{box-sizing:border-box;}
body{margin:0;font-family:-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;color:var(--ink);background:#f8fafc;font-size:16px;line-height:1.6;}
.pnav{display:flex;align-items:center;gap:16px;background:var(--bg);padding:14px 24px;}
.pnav a{color:#cbd5e1;text-decoration:none;padding:8px 12px;border-radius:8px;min-height:40px;display:inline-flex;align-items:center;}
.pnav a:hover{color:#fff;background:rgba(255,255,255,.08);}
.pbrand{color:#fff!important;font-weight:700;font-size:1.15rem;}
.pspacer{flex:1;}
.pbtn{background:var(--brand);color:#fff!important;}
.wrap{max-width:960px;margin:0 auto;padding:32px 20px 64px;}
.hero{padding:40px 0 20px;}
.hero h1{font-size:2rem;margin:0 0 12px;}
.hero p{color:var(--muted);max-width:70ch;font-size:1.1rem;}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;margin:24px 0;}
.tile{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px;}
.tile h3{margin:0 0 6px;font-size:1rem;}
.tile p{margin:0;color:var(--muted);font-size:.95rem;}
h2{font-size:1.3rem;margin:28px 0 10px;}
ul.plain{color:var(--muted);}
.card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:24px;max-width:420px;margin:24px auto;}
.card h1{margin:0 0 16px;font-size:1.4rem;}
label{display:block;margin:12px 0;font-size:.95rem;}
input{display:block;width:100%;margin-top:4px;padding:10px;font-size:1rem;border:1px solid var(--line);border-radius:8px;min-height:44px;}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:10px 18px;border:0;border-radius:8px;background:var(--brand);color:#fff;font-size:1rem;cursor:pointer;text-decoration:none;width:100%;}
.btn:hover{filter:brightness(1.05);}
.result-err{background:#fef2f2;color:#7f1d1d;border:1px solid #fca5a5;border-radius:8px;padding:10px 14px;margin:12px 0;}
.pfooter{border-top:1px solid var(--line);color:var(--muted);padding:20px;text-align:center;font-size:.9rem;}
.muted{color:var(--muted);}
@media (max-width:640px){.hero h1{font-size:1.6rem;}}