:root{
  --bg:#f7f9fc;--panel:#fff;--text:#162033;--muted:#64748b;--border:#dbe3ee;
  --accent:#2563eb;--accent-dark:#1d4ed8;--soft:#eaf1ff;--danger:#b42318;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--bg);color:var(--text);line-height:1.5}
a{color:var(--accent)}
button,input,select{font:inherit}
button{cursor:pointer}
.container{width:min(1120px,calc(100% - 32px));margin:auto}
.site-header{background:rgba(255,255,255,.94);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:10;backdrop-filter:blur(10px)}
.header-row,.footer-row{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:16px 0}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--text)}
.brand-icon{display:grid;place-items:center;width:42px;height:42px;border-radius:12px;background:var(--accent);color:#fff;font-size:28px}
.brand strong,.brand small{display:block}
.brand small{color:var(--muted)}
nav{display:flex;gap:22px}
nav a{text-decoration:none;color:var(--text)}
main{padding:54px 0}
section{margin-bottom:58px}
.hero{padding-top:8px}
.eyebrow,.section-heading p,.note,.status,.metric-card span,.metric-card small{color:var(--muted)}
h1{font-size:clamp(2rem,6vw,4.5rem);line-height:1.05;margin:8px 0 28px;overflow-wrap:anywhere}
h2{font-size:1.65rem;margin:0 0 6px}
.metric-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.metric-card,.tool-panel,.privacy{background:var(--panel);border:1px solid var(--border);border-radius:18px;padding:20px}
.metric-card strong{display:block;margin:6px 0;font-size:1.08rem;overflow-wrap:anywhere}
.metric-card a{font-size:.92rem}
.actions{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin-top:20px}
button{border:1px solid var(--border);background:#fff;color:var(--text);padding:11px 16px;border-radius:12px}
button:hover{border-color:#9bb3d4}
button.primary{background:var(--accent);border-color:var(--accent);color:#fff}
button.primary:hover{background:var(--accent-dark)}
.note{max-width:850px;font-size:.92rem}
.section-heading{margin-bottom:18px}
.tool-panel{display:grid;gap:12px}
label{font-weight:600}
input,select{width:100%;border:1px solid var(--border);border-radius:12px;background:#fff;color:var(--text);padding:12px}
input:focus,select:focus,button:focus{outline:3px solid rgba(37,99,235,.2);outline-offset:2px}
.tool-buttons{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.result{min-height:120px;border-radius:14px;background:#0f172a;color:#dbeafe;padding:18px;white-space:pre-wrap;overflow-wrap:anywhere;font-family:ui-monospace,SFMono-Regular,Menlo,monospace}
.subnet-panel{display:grid;grid-template-columns:2fr 120px auto;align-items:end;gap:12px;margin-bottom:16px}
.privacy{background:var(--soft)}
footer{border-top:1px solid var(--border);background:#fff;color:var(--muted);font-size:.92rem}
.error{color:#ffb4ab}
@media(max-width:850px){
  .metric-grid{grid-template-columns:repeat(2,1fr)}
  .tool-buttons{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:620px){
  .header-row,.footer-row{align-items:flex-start;flex-direction:column}
  nav{gap:14px;flex-wrap:wrap}
  main{padding-top:34px}
  .metric-grid,.tool-buttons,.subnet-panel{grid-template-columns:1fr}
}