:root{
  --bg:#f5f7fb;
  --panel:#ffffff;
  --ink:#0f1b2d;
  --muted:#5b6b82;
  --line:#e4e9f2;
  --brand:#12326b;
  --brand2:#1f4fa3;
  --accent:#0f9d6b;
  --accent-d:#0c7d55;
  --warn:#b45309;
  --warn-bg:#fff7ed;
  --shadow:0 10px 30px rgba(16,35,74,.08);
  --radius:14px;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font:16px/1.55 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--brand2);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1040px;margin:0 auto;padding:0 18px}
.mono{font-family:var(--mono)}

/* header */
.site-header{background:var(--panel);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--brand);font-size:18px}
.brand .logo{width:30px;height:30px;border-radius:8px;background:linear-gradient(135deg,var(--brand),var(--brand2));display:grid;place-items:center;color:#fff;font-size:16px}
.badge-free{font-size:12.5px;font-weight:700;color:var(--accent-d);background:#e7f6ef;border:1px solid #bfe6d4;padding:5px 10px;border-radius:999px}

/* hero */
.hero{padding:46px 0 26px}
.hero h1{font-size:34px;line-height:1.15;margin:0 0 12px;letter-spacing:-.02em}
.hero p.sub{font-size:18px;color:var(--muted);margin:0;max-width:720px}
.trustbar{display:flex;flex-wrap:wrap;gap:10px 22px;margin-top:20px;color:var(--muted);font-size:14px}
.trustbar span{display:inline-flex;align-items:center;gap:7px}
.trustbar b{color:var(--ink)}

/* cards / steps */
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:24px;margin-top:22px}
.card h2{margin:0 0 6px;font-size:20px}
.card .hint{color:var(--muted);font-size:14px;margin:0 0 16px}
.step-label{display:inline-flex;align-items:center;gap:8px;font-weight:700;color:var(--brand);font-size:14px;margin-bottom:12px}
.step-label .n{width:22px;height:22px;border-radius:50%;background:var(--brand);color:#fff;display:grid;place-items:center;font-size:13px}

label{display:block;font-weight:600;font-size:14px;margin-bottom:7px}
input[type=text],input[type=email]{
  width:100%;padding:13px 14px;border:1px solid var(--line);border-radius:10px;
  font-size:15px;background:#fbfcfe;color:var(--ink);
}
input[type=text]:focus,input[type=email]:focus{outline:none;border-color:var(--brand2);background:#fff;box-shadow:0 0 0 3px rgba(31,79,163,.12)}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;cursor:pointer;
  border:0;border-radius:10px;padding:13px 20px;font-size:15px;font-weight:700;transition:.15s}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand2)}
.btn-accent{background:var(--accent);color:#fff}
.btn-accent:hover{background:var(--accent-d)}
.btn-ghost{background:#eef2f8;color:var(--brand);border:1px solid var(--line)}
.btn-ghost:hover{background:#e5ebf5}
.btn-block{width:100%}
.row{display:flex;gap:12px;flex-wrap:wrap}
.row .grow{flex:1 1 260px}

/* detected panel */
.detect{display:none;margin-top:18px;padding:16px;border-radius:12px;background:#eef7f2;border:1px solid #bfe6d4}
.detect.show{display:block}
.detect .ttl{font-weight:700;color:var(--accent-d);margin-bottom:8px}
.detect dl{margin:0;display:grid;grid-template-columns:auto 1fr;gap:5px 14px;font-size:14px}
.detect dt{color:var(--muted)}
.detect dd{margin:0;font-family:var(--mono);word-break:break-all}
.spinner{width:16px;height:16px;border:2px solid #bfe6d4;border-top-color:var(--accent-d);border-radius:50%;display:inline-block;animation:sp 1s linear infinite;vertical-align:-3px}
@keyframes sp{to{transform:rotate(360deg)}}

/* options */
.options{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:8px}
.opt{border:1px solid var(--line);border-radius:12px;padding:18px;background:#fbfcfe}
.opt h3{margin:0 0 6px;font-size:16px}
.opt p{margin:0 0 12px;color:var(--muted);font-size:14px}
.opt .rec{font-size:11.5px;font-weight:800;letter-spacing:.04em;color:var(--accent-d);text-transform:uppercase}
.addr-box{background:#0f1b2d;color:#eaf0fb;border-radius:10px;padding:12px 14px;font-family:var(--mono);font-size:13px;word-break:break-all;display:flex;gap:10px;align-items:center;justify-content:space-between}
.addr-box button{background:#1f4fa3;color:#fff;border:0;border-radius:7px;padding:6px 10px;font-size:12px;cursor:pointer;white-space:nowrap}
.addr-box button:hover{background:#2a5fbf}
.qr{display:block;margin:12px auto 0;width:150px;height:150px;border:1px solid var(--line);border-radius:10px;background:#fff}
.fee-note{font-size:13px;color:var(--muted);margin-top:10px}
.fee-note b{color:var(--ink)}

/* seed inputs */
.seed-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:9px;margin-bottom:14px}
.seed-grid input{padding:11px 10px;font-size:13.5px;text-transform:lowercase}
.seed-grid input::placeholder{color:#9aa7ba;text-transform:none}
.reassure{font-size:13px;color:var(--muted);margin-top:12px;display:flex;gap:8px;align-items:flex-start}
.reassure svg{flex:none;margin-top:2px}

/* result */
.result{display:none;margin-top:18px;padding:18px;border-radius:12px;background:#eef7f2;border:1px solid #bfe6d4}
.result.show{display:block}
.result .ttl{font-weight:800;color:var(--accent-d);font-size:16px;margin-bottom:6px}
.result p{margin:0;color:var(--ink);font-size:14.5px}
.result .txid{font-family:var(--mono);font-size:12.5px;color:var(--muted);word-break:break-all;margin-top:10px}

/* sections */
.section{padding:34px 0}
.section h2{font-size:24px;margin:0 0 18px;letter-spacing:-.01em}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.feat{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:18px}
.feat .ic{width:38px;height:38px;border-radius:10px;background:#eef2f8;display:grid;place-items:center;color:var(--brand);font-size:18px;margin-bottom:12px}
.feat h3{margin:0 0 6px;font-size:16px}
.feat p{margin:0;color:var(--muted);font-size:14px}

/* why / faq */
.why{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:22px}
.why p{margin:0 0 12px;color:#33415a;font-size:15px}
.why p:last-child{margin-bottom:0}
.faq details{border-bottom:1px solid var(--line);padding:14px 0}
.faq summary{cursor:pointer;font-weight:700;font-size:15.5px;list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:22px;color:var(--brand2);font-weight:400}
.faq details[open] summary::after{content:"–"}
.faq details p{margin:10px 0 0;color:var(--muted);font-size:14.5px}
.sources{font-size:13.5px;color:var(--muted);margin-top:14px}
.sources a{margin-right:14px}

/* footer */
.site-footer{border-top:1px solid var(--line);background:var(--panel);padding:26px 0;margin-top:20px}
.site-footer .wrap{display:flex;flex-wrap:wrap;gap:14px;justify-content:space-between;align-items:center;font-size:13.5px;color:var(--muted)}
.site-footer nav{display:flex;gap:16px;flex-wrap:wrap}
.disclaimer{font-size:12.5px;color:#8592a6;max-width:760px;margin-top:10px}

@media(max-width:760px){
  .hero h1{font-size:27px}
  .options{grid-template-columns:1fr}
  .grid3{grid-template-columns:1fr}
  .seed-grid{grid-template-columns:repeat(3,1fr)}
  .detect dl{grid-template-columns:1fr;gap:2px 0}
  .detect dd{margin-bottom:8px}
}