/* SmartCalc.net — design system
   System font stack only (zero font downloads -> perf 100).
   Signature: calculator results render as a "ledger" — monospace,
   tabular figures, thin blue rules — like a bank statement line item. */

:root{
  --bg:#ffffff;
  --surface:#F8FAFC;
  --surface-blue:#EFF6FF;
  --ink:#0B1324;
  --ink-soft:#47536B;
  --ink-faint:#7C8AA5;
  --border:#E4E9F2;
  --blue:#1D4ED8;
  --blue-dark:#15348F;
  --blue-ring:#BFD4FF;
  --green:#15803D;
  --radius:10px;
  --max:1120px;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Consolas, "Liberation Mono", Menlo, monospace;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:var(--sans);
  color:var(--ink);
  background:var(--bg);
  line-height:1.55;
  font-size:16px;
}
img{max-width:100%;display:block}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3{font-family:var(--sans);color:var(--ink);line-height:1.2;letter-spacing:-0.01em;margin:0 0 .5em}
h1{font-size:clamp(1.7rem,1.2rem + 2vw,2.5rem);font-weight:700}
h2{font-size:1.35rem;font-weight:700}
h3{font-size:1.05rem;font-weight:600}
p{margin:0 0 1em;color:var(--ink-soft)}
.wrap{max-width:var(--max);margin:0 auto;padding:0 20px}
.visually-hidden{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}

/* skip link for a11y */
.skip-link{position:absolute;left:-999px;top:0;background:var(--blue);color:#fff;padding:10px 16px;z-index:100;border-radius:0 0 8px 0}
.skip-link:focus{left:0}

/* header */
.site-header{border-bottom:1px solid var(--border);background:var(--bg)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{font-weight:800;font-size:1.15rem;color:var(--ink);letter-spacing:-0.01em;display:flex;align-items:center;gap:8px}
.logo .mark{width:9px;height:22px;background:var(--blue);border-radius:2px;display:inline-block}
.logo .dot{color:var(--blue)}
nav.main-nav ul{list-style:none;display:flex;gap:28px;margin:0;padding:0}
nav.main-nav a{color:var(--ink-soft);font-weight:600;font-size:.95rem}
nav.main-nav a:hover{color:var(--blue);text-decoration:none}
.crumbs{font-size:.85rem;color:var(--ink-faint);padding:14px 0}
.crumbs a{color:var(--ink-faint)}
.crumbs a:hover{color:var(--blue)}

/* hero */
.hero{padding:56px 0 40px;border-bottom:1px solid var(--border)}
.hero .eyebrow{color:var(--blue);font-weight:700;font-size:.8rem;letter-spacing:.08em;text-transform:uppercase;margin-bottom:10px}
.hero p.lead{font-size:1.15rem;max-width:640px}

/* card / calculator shell */
.calc-shell{display:grid;grid-template-columns:1.1fr 1fr;gap:0;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;margin:32px 0;background:var(--bg)}
@media (max-width:800px){.calc-shell{grid-template-columns:1fr}}

.calc-form{padding:32px;border-right:1px solid var(--border)}
@media (max-width:800px){.calc-form{border-right:none;border-bottom:1px solid var(--border)}}
.field{margin-bottom:20px}
.field label{display:flex;justify-content:space-between;font-weight:600;font-size:.9rem;margin-bottom:6px;color:var(--ink)}
.field label .unit{color:var(--ink-faint);font-weight:500}
.field input, .field select{
  width:100%;padding:11px 12px;border:1px solid var(--border);border-radius:8px;
  font-size:1rem;font-family:var(--mono);font-variant-numeric:tabular-nums;color:var(--ink);background:#fff;
}
.field input:focus, .field select:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px var(--blue-ring)}
.field .hint{font-size:.8rem;color:var(--ink-faint);margin-top:4px}
.btn{
  appearance:none;border:none;background:var(--blue);color:#fff;font-weight:700;font-size:.95rem;
  padding:13px 22px;border-radius:8px;cursor:pointer;width:100%;transition:background .12s ease;
}
.btn:hover{background:var(--blue-dark)}
.btn:focus-visible{outline:3px solid var(--blue-ring);outline-offset:2px}

/* ledger-style results */
.ledger{padding:32px;background:var(--surface)}
.ledger h2{font-size:.8rem;text-transform:uppercase;letter-spacing:.08em;color:var(--ink-faint);font-weight:700;margin-bottom:18px}
.ledger-row{display:flex;justify-content:space-between;align-items:baseline;padding:11px 0;border-bottom:1px dashed var(--border);font-family:var(--mono);font-variant-numeric:tabular-nums}
.ledger-row .label{font-family:var(--sans);color:var(--ink-soft);font-size:.92rem;font-weight:500}
.ledger-row .value{font-size:1rem;color:var(--ink);font-weight:600}
.ledger-row.total{border-bottom:none;border-top:2px solid var(--blue);margin-top:6px;padding-top:16px}
.ledger-row.total .label{color:var(--ink);font-weight:700;font-family:var(--sans)}
.ledger-row.total .value{color:var(--blue);font-size:1.5rem;font-weight:800}
.ledger-note{font-size:.8rem;color:var(--ink-faint);margin-top:16px}

/* content sections */
.section{padding:40px 0;border-top:1px solid var(--border)}
.section h2{margin-bottom:14px}
.grid-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:16px;margin-top:20px}
.card-link{display:block;border:1px solid var(--border);border-radius:var(--radius);padding:20px;background:#fff;transition:border-color .12s ease}
.card-link:hover{border-color:var(--blue);text-decoration:none}
.card-link .cat{font-size:.72rem;text-transform:uppercase;letter-spacing:.06em;color:var(--blue);font-weight:700;margin-bottom:6px}
.card-link h3{margin-bottom:6px}
.card-link p{margin:0;font-size:.9rem;color:var(--ink-faint)}

/* country picker */
.country-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:14px;margin-top:20px}
.country-card{border:1px solid var(--border);border-radius:var(--radius);padding:18px;text-align:center;background:#fff;font-weight:700;color:var(--ink)}
.country-card:hover{border-color:var(--blue);text-decoration:none}
.country-card .flag{font-size:1.6rem;display:block;margin-bottom:8px}
.country-card .count{display:block;font-weight:500;font-size:.78rem;color:var(--ink-faint);margin-top:2px}

/* faq */
.faq details{border-bottom:1px solid var(--border);padding:14px 0}
.faq summary{cursor:pointer;font-weight:600;font-size:1rem;color:var(--ink);list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--blue);font-size:1.3rem;font-weight:400;margin-left:12px}
.faq details[open] summary::after{content:"–"}
.faq p{margin-top:10px}

/* footer */
.site-footer{border-top:1px solid var(--border);padding:36px 0;margin-top:40px;background:var(--surface)}
.site-footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:20px;font-size:.85rem;color:var(--ink-faint)}
.site-footer nav ul{list-style:none;display:flex;gap:20px;margin:0;padding:0}
.site-footer a{color:var(--ink-faint)}
.disclaimer{font-size:.78rem;color:var(--ink-faint);margin-top:14px;line-height:1.6}

@media (prefers-reduced-motion: reduce){
  *{transition:none !important;animation:none !important}
}