:root{
  --bg:#f4f7fc;
  --bg-2:#eef3fb;
  --panel:#ffffff;
  --panel-2:#f9fbff;
  --line:#d9e4f2;
  --line-2:#c7d7ec;
  --text:#102033;
  --muted:#5f728f;
  --primary:#4f8fff;
  --primary-2:#7d6dff;
  --glow:rgba(79,143,255,.16);
  --shadow:0 18px 42px rgba(26,49,86,.10);
  --shadow-soft:0 10px 24px rgba(26,49,86,.08);
  --radius:22px;
}
*{box-sizing:border-box}
html{font-size:16px}
body{
  margin:0;
  font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;
  color:var(--text);
  background:
    radial-gradient(circle at top left, rgba(125,109,255,.08), transparent 30rem),
    radial-gradient(circle at top right, rgba(79,143,255,.10), transparent 30rem),
    linear-gradient(180deg,var(--bg),var(--bg-2));
}
.lab-surface::before{
  content:"";
  position:fixed;
  inset:0;
  background-image:
    linear-gradient(rgba(16,32,51,.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(16,32,51,.03) 1px, transparent 1px);
  background-size:36px 36px;
  mask-image:linear-gradient(180deg, rgba(255,255,255,.7), transparent 78%);
  pointer-events:none;
}
a{color:inherit}
.site-header,.site-footer{position:relative;z-index:2}
.header-shell{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:1rem .25rem .25rem}
.brand{display:inline-flex;align-items:center;text-decoration:none}
.brand img{display:block;height:34px;width:auto}
.site-nav{display:flex;flex-wrap:wrap;gap:.85rem}
.site-nav a,.footer-note a{text-decoration:none;color:#315cae;font-weight:700}
.site-shell{width:min(1120px, calc(100% - 1rem));margin:0 auto;padding:.9rem .25rem 3rem;position:relative}
.breadcrumbs{display:flex;flex-wrap:wrap;gap:.45rem;margin-bottom:.65rem;color:var(--muted);font-size:.92rem}
.breadcrumbs a{text-decoration:none}
.hero,.content-card,.tool-card,.result-card,.calculator-card,.mini-tool-card{position:relative;overflow:hidden}
.hero,
.content-card,
.tool-card,
.result-card,
.calculator-card{
  background:linear-gradient(180deg, rgba(255,255,255,.96), rgba(249,252,255,.96));
  border:1px solid var(--line);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
}
.content-card{padding:1rem}
.hero{
  padding:1.15rem;
  margin-top:.55rem;
}
.hero::before,
.tool-card::before,
.content-card::before,
.result-card::before,
.calculator-card::before{
  content:"";
  position:absolute;
  inset:auto -4rem -4rem auto;
  width:12rem;
  height:12rem;
  background:radial-gradient(circle, var(--glow), transparent 68%);
  pointer-events:none;
}
.hero-brand-row{display:flex;align-items:center;gap:.7rem;margin-bottom:.4rem}
.hero-logo{display:block;width:min(300px, 62vw);height:auto}
.logo-text{
  font-weight:800;
  font-size:1.55rem;
  letter-spacing:-.03em;
  line-height:1;
  color:#102033;
}
.logo-text span{
  color:#4f8fff;
}
.eyebrow{
  display:inline-flex;
  padding:.42rem .72rem;
  border-radius:999px;
  background:rgba(79,143,255,.08);
  color:#315cae;
  border:1px solid rgba(79,143,255,.14);
  font-size:.8rem;
  font-weight:800;
  letter-spacing:.02em;
}
.hero h1{margin:.25rem 0 .55rem;font-size:clamp(2rem,7vw,3.35rem);line-height:1.03;letter-spacing:-.035em}
.hero-copy{margin:0;color:var(--muted);font-size:1rem;line-height:1.6;max-width:46rem}
.hero-badges{display:grid;grid-template-columns:1fr;gap:.55rem;margin-top:1rem}
.hero-badge{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:2.6rem;padding:.7rem .9rem;border-radius:14px;
  background:#f5f9ff;border:1px solid var(--line-2);font-weight:700;color:#28456f
}
.intro-card{margin-top:1rem}
.section-head h2{margin:0 0 .35rem}
.section-head p{margin:0;color:var(--muted);line-height:1.6}
.calculator-grid-section{margin-top:1rem}
.calculator-grid{display:grid;grid-template-columns:1fr;gap:.85rem}
.tool-card{padding:1rem;text-decoration:none}
.tool-card h3{margin:0 0 .45rem;font-size:1.15rem}
.tool-card p{margin:0;color:var(--muted);line-height:1.55}
.text-link{display:inline-block;margin-top:.75rem;color:#315cae;font-weight:700;text-decoration:none}
.calculator-layout{display:grid;grid-template-columns:1fr;gap:.85rem;margin-top:1rem}
.calculator-card,.result-card{padding:1rem}
.toggle-row{display:grid;grid-template-columns:1fr;gap:.55rem;margin-bottom:.8rem}
.mode-toggle,.unit-toggle,.currency-pill,.mini-tool-card{
  width:100%;
  min-height:2.8rem;
  border-radius:14px;
  border:1px solid var(--line-2);
  background:#ffffff;
  color:var(--text);
  font-weight:700;
}
.mode-toggle.is-active,.unit-toggle.is-active,.currency-pill.is-active{
  background:linear-gradient(135deg, rgba(79,143,255,.12), rgba(125,109,255,.12));
  border-color:#7aa8ff;
  color:#18375f;
  box-shadow:0 0 0 1px rgba(79,143,255,.06), 0 0 18px rgba(79,143,255,.08);
}
.calculator-form .field-grid{display:grid;grid-template-columns:1fr;gap:.8rem}
.calculator-form label{display:grid;gap:.38rem}
.calculator-form span{font-size:.92rem;font-weight:700}
.form-note{margin:.2rem 0 0;color:var(--muted);line-height:1.6}
.calculator-form input{
  width:100%;
  min-height:3rem;
  border-radius:14px;
  border:1px solid var(--line-2);
  padding:.8rem .9rem;
  font:inherit;
  background:#ffffff;
  color:var(--text);
}
.btn{
  display:inline-flex;justify-content:center;align-items:center;text-decoration:none;
  border-radius:16px;min-height:3rem;padding:.8rem 1rem;font-weight:800;border:1px solid transparent
}
.btn-primary{
  color:#ffffff;
  background:linear-gradient(135deg,var(--primary),#7ca8ff);
  box-shadow:0 12px 24px rgba(79,143,255,.16)
}
.btn-block{width:100%}
.result-kicker{font-size:.8rem;font-weight:800;color:#4b78bc;text-transform:uppercase;letter-spacing:.04em}
.result-main{margin:.35rem 0 .5rem;font-size:clamp(1.45rem,6vw,2.05rem);line-height:1.08}
.result-sub{margin:0;color:var(--muted);line-height:1.55}
.currency-pills{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:.45rem;margin-top:.9rem}
.result-breakdown{margin-top:1rem}
.break-row{display:flex;justify-content:space-between;gap:1rem;padding:.68rem 0;border-top:1px solid var(--line)}
.break-row span{color:var(--muted)}
.break-row strong{color:var(--text)}
.quality-strip{display:grid;grid-template-columns:1fr;gap:.85rem;margin-top:1rem}
.quality-card{padding:1rem}
.quality-kicker{font-size:.8rem;font-weight:800;color:#4b78bc;text-transform:uppercase;letter-spacing:.04em}
.quality-card h2{margin:.35rem 0 .45rem;font-size:1.1rem}
.quality-card p{margin:0;color:var(--muted);line-height:1.6}
.calc-note{margin-top:.8rem;padding-top:.8rem;border-top:1px solid var(--line);color:var(--muted);font-size:.95rem;line-height:1.5}
.related-tools{margin-top:1rem}
.mini-tool-grid{display:grid;grid-template-columns:1fr;gap:.7rem}
.mini-tool-card{
  display:flex;align-items:center;justify-content:center;
  text-decoration:none;padding:.85rem 1rem
}
.prose-card h2{margin:.1rem 0 .55rem}
.prose-card p{margin:0;color:var(--muted);line-height:1.65}
.stack-grid{display:grid;grid-template-columns:1fr;gap:.85rem;margin-top:1rem}
.ad-slot{margin:1rem 0;padding:.85rem;border:1px dashed var(--line-2);border-radius:18px;background:rgba(255,255,255,.68)}
.ad-slot-label{font-size:.8rem;font-weight:800;color:#4b78bc;text-transform:uppercase;letter-spacing:.04em}
.ad-slot-box{margin-top:.45rem;min-height:90px;border-radius:14px;background:linear-gradient(135deg, rgba(79,143,255,.08), rgba(125,109,255,.08));display:flex;align-items:center;justify-content:center;color:var(--muted);font-weight:700}
.footer-grid{padding:0 .25rem 2rem}
.footer-note{display:flex;flex-wrap:wrap;gap:.8rem;margin-top:.5rem}
@media (min-width:720px){
  .site-shell{width:min(1120px, calc(100% - 2rem));padding:1rem .5rem 4rem}
  .stack-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .hero{padding:1.35rem}
  .hero-badges{grid-template-columns:repeat(3,max-content);justify-content:flex-start}
  .calculator-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .quality-strip{grid-template-columns:repeat(3,minmax(0,1fr))}
  .toggle-row{grid-template-columns:repeat(3,minmax(0,1fr))}
  .units-row{grid-template-columns:repeat(2,minmax(0,1fr))}
  .calculator-form .field-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .mini-tool-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (min-width:1024px){
  .calculator-layout{grid-template-columns:minmax(0,1.2fr) minmax(320px,.8fr);align-items:start}
  .result-card{position:sticky;top:1rem}
  .calculator-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
  .mini-tool-grid{grid-template-columns:repeat(4,minmax(0,1fr))}
}