:root{
  --bg:#fafafa;
  --surface:#ffffff;
  --text:#111111;
  --muted:#6b7280;
  --border:rgba(17,17,17,0.08);
  --shadow:0 10px 30px rgba(0,0,0,0.06);
  --shadow-soft:0 4px 20px rgba(0,0,0,0.04);
  --accent:#4f46e5;
  --accent-soft:rgba(79,70,229,0.10);

  --radius-sm:12px;
  --radius-md:16px;

  --space-1:8px;
  --space-2:12px;
  --space-3:16px;
  --space-4:24px;
  --space-5:32px;
  --space-6:48px;

  --maxw:760px;
  --font:ui-sans-serif,system-ui,-apple-system,"Segoe UI",Inter,Roboto,Arial,"Noto Sans","Apple Color Emoji","Segoe UI Emoji";
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--text);
  font-family:var(--font);
  line-height:1.5;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}

a{color:inherit;text-decoration:none}
a:focus-visible,button:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{
  outline:none;
  box-shadow:0 0 0 3px var(--accent-soft);
  border-color:rgba(79,70,229,0.35)!important;
}

.skip-link{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden}
.skip-link:focus{
  left:var(--space-4);top:var(--space-4);width:auto;height:auto;
  background:var(--surface);padding:var(--space-2) var(--space-3);
  border-radius:var(--radius-sm);box-shadow:var(--shadow-soft);
}

.container{max-width:var(--maxw);margin:0 auto;padding:0 var(--space-4)}

.site-header{
  position:sticky;top:0;z-index:10;
  backdrop-filter:saturate(180%) blur(10px);
  background:rgba(250,250,250,0.75);
  border-bottom:1px solid rgba(17,17,17,0.06);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px}

/* Logo: thicker + slightly bigger */
.logo{
  font-weight:800;
  letter-spacing:-0.02em;
  font-size:16px;
}
@media (min-width:740px){
  .logo{font-size:17px}
}

.nav{display:flex;gap:var(--space-2);flex-wrap:wrap}
.nav-link{
  color:var(--muted);
  font-size:14px;
  padding:8px 10px;
  border-radius:10px;
}
.nav-link.is-active{color:var(--text);background:rgba(17,17,17,0.04)}

.hero{padding:var(--space-6) 0 var(--space-5)}
h1{
  font-size:32px;line-height:1.15;margin:0 0 var(--space-2);
  letter-spacing:-0.03em;
}
.lead{margin:0 0 var(--space-4);color:var(--muted);font-size:17px}

.section{padding:var(--space-5) 0}
.section-head{margin-bottom:var(--space-4)}
.section-head h2{margin:0;font-size:18px;letter-spacing:-0.01em}

.muted{color:var(--muted)}
.muted-link{color:var(--muted)}
.muted-link:hover{color:var(--text)}

.grid{display:grid;gap:var(--space-3);grid-template-columns:1fr}
@media (min-width:740px){ .grid{grid-template-columns:1fr 1fr} }

.card{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius-md);
  padding:var(--space-4);
  box-shadow:var(--shadow-soft);
  transition:transform 120ms ease, box-shadow 120ms ease;
}
.card:hover{transform:translateY(-2px);box-shadow:var(--shadow)}

/* Tool card icon */
.card-icon{
  width:44px;
  height:44px;
  display:block;
  margin-bottom:12px;
  border-radius:14px;
}

.card-title{font-weight:600;margin-bottom:6px}
.card-desc{color:var(--muted);font-size:14px;margin-bottom:var(--space-3)}
.card-cta{font-size:14px;color:var(--text)}

.page-head{padding:var(--space-5) 0 var(--space-3)}
.page-head h1{font-size:28px}

.site-footer{
  padding:var(--space-5) 0;
  border-top:1px solid rgba(17,17,17,0.06);
  margin-top:var(--space-6);
}
.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:var(--space-3);flex-wrap:wrap}
.footer-links{display:flex;gap:var(--space-3);flex-wrap:wrap}

.tool{padding-bottom:var(--space-6)}
.tool-grid{display:grid;grid-template-columns:1fr;gap:var(--space-3)}
@media (min-width:740px){ .tool-grid{grid-template-columns:1fr 1fr} }

.panel{
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius-md);
  padding:var(--space-4);
  box-shadow:var(--shadow-soft);
}
.panel.narrow{max-width:520px}
.h3{margin:0 0 var(--space-3);font-size:16px;letter-spacing:-0.01em}

.form-row{display:flex;flex-direction:column;gap:6px;margin-bottom:var(--space-3)}
label{font-size:13px;color:var(--muted)}

input,textarea,select{
  width:100%;
  padding:12px 12px;
  border-radius:var(--radius-sm);
  border:1px solid rgba(17,17,17,0.12);
  background:#fff;
  font-size:16px;
}
textarea{resize:vertical;min-height:180px}
select{appearance:none}

.hint{font-size:12px;margin-top:6px}
.actions{display:flex;gap:var(--space-3);margin-top:var(--space-4);flex-wrap:wrap}
.backline{padding:0 0 var(--space-6)}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 14px;border-radius:12px;
  border:1px solid rgba(17,17,17,0.10);
  background:rgba(17,17,17,0.92);
  color:#fff;font-weight:600;font-size:15px;cursor:pointer;
}
.btn:hover{background:rgba(17,17,17,0.98)}
.btn:active{transform:translateY(1px)}
.btn-ghost{background:rgba(17,17,17,0.04);color:var(--text)}
.btn-ghost:hover{background:rgba(17,17,17,0.06)}

.result{
  margin-top:var(--space-4);
  padding:var(--space-4);
  border-radius:var(--radius-md);
  border:1px solid rgba(17,17,17,0.08);
  background:rgba(17,17,17,0.02);
}
.result-label{font-size:12px;color:var(--muted);margin-bottom:6px}
.result-value{font-size:28px;font-weight:700;letter-spacing:-0.02em}
.result-sub{margin-top:6px;font-size:13px}

.stats{
  display:grid;grid-template-columns:1fr;gap:var(--space-3);margin-top:var(--space-4)
}
@media (min-width:740px){ .stats{grid-template-columns:1fr 1fr 1fr} }
.stat{
  padding:var(--space-3);
  border:1px solid rgba(17,17,17,0.08);
  border-radius:var(--radius-md);
  background:rgba(17,17,17,0.02);
}
.stat-label{font-size:12px;color:var(--muted);margin-bottom:6px}
.stat-value{font-size:22px;font-weight:700}

.ad-slot{
  margin-top:var(--space-4);
  border:1px dashed rgba(17,17,17,0.18);
  border-radius:var(--radius-md);
  background:rgba(255,255,255,0.7);
  padding:var(--space-4);
}
.ad-placeholder{color:var(--muted);font-size:13px}

.subtle-callout{margin-top:var(--space-5);padding:0}
.callout-inner{
  display:flex;align-items:center;justify-content:space-between;
  gap:var(--space-3);flex-wrap:wrap;
  background:rgba(17,17,17,0.02);
  border:1px solid rgba(17,17,17,0.06);
  border-radius:var(--radius-md);
  padding:var(--space-4);
}
.callout-title{font-weight:600;margin-bottom:4px}