/* Kalkula — minimal tool-first stylesheet. Mobile-first, no frameworks. */
:root {
  --green: #1a5c3f;
  --green-dark: #12402c;
  --accent: #e8a33d;
  --bg: #ffffff;
  --surface: #f4f7f5;
  --text: #1c2420;
  --muted: #5c6b62;
  --border: #dfe7e2;
  --radius: 12px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Noto Sans", Arial, sans-serif;
  line-height: 1.65; font-size: 17px;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 0 18px; }
a { color: var(--green); }
img { max-width: 100%; }

/* Header */
.site-header { background: var(--green); color: #fff; padding: 14px 0; }
.site-header a { color: #fff; }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font-size: 22px; font-weight: 800; }
.tagline { margin: 4px 0 8px; font-size: 14px; opacity: .85; }
.lang-switch { display: flex; flex-wrap: wrap; gap: 8px; font-size: 14px; }
.lang-link { background: rgba(255,255,255,.14); padding: 4px 12px; border-radius: 20px; text-decoration: none; }
.lang-link:hover { background: rgba(255,255,255,.28); }
.lang-current { padding: 4px 12px; border-radius: 20px; background: #fff; color: var(--green-dark); font-weight: 700; }

/* Main */
main { padding: 26px 0 40px; }
h1 { font-size: 30px; line-height: 1.25; margin: 0 0 6px; }
.subtitle { color: var(--muted); margin-top: 0; }
.breadcrumb { font-size: 14px; color: var(--muted); margin-bottom: 14px; }
.breadcrumb a { color: var(--muted); }

/* Calculator widget */
.calc { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; margin: 20px 0; }
.calc-label { display: block; font-weight: 700; margin-bottom: 8px; }
.calc-input {
  width: 100%; max-width: 320px; padding: 12px 14px; font-size: 17px;
  border: 1.5px solid var(--border); border-radius: 8px; background: #fff; color: var(--text);
}
.calc-input:focus { outline: 2px solid var(--green); border-color: var(--green); }
.calc-result { margin-top: 16px; }
.calc-hint { color: var(--muted); margin: 0; }
.calc-error { color: #b3261e; font-weight: 600; margin: 0; }
.age-big { font-size: 20px; margin: 0 0 10px; }
.age-num { font-size: 34px; font-weight: 800; color: var(--green-dark); }
.age-facts { list-style: none; padding: 0; margin: 0; display: grid; gap: 6px; }
.age-facts li { background: #fff; border: 1px solid var(--border); border-radius: 8px; padding: 8px 12px; font-size: 15px; }
.calc-copy {
  margin-top: 14px; padding: 10px 20px; font-size: 16px; font-weight: 700;
  background: var(--green); color: #fff; border: 0; border-radius: 8px; cursor: pointer;
}
.calc-copy:hover { background: var(--green-dark); }

/* Content */
.tool-page h2 { font-size: 22px; margin: 30px 0 10px; }
.tool-page h3 { font-size: 18px; margin: 22px 0 8px; }
.tool-box p, .faq-block p { margin: 0 0 14px; }
.formula { background: #fff; border: 1px dashed var(--green); border-radius: 8px; padding: 12px 16px; font-family: ui-monospace, monospace; }

/* FAQ */
.faq-block details { border: 1px solid var(--border); border-radius: 8px; margin-bottom: 8px; background: #fff; }
.faq-block summary { padding: 12px 14px; cursor: pointer; font-weight: 600; }
.faq-block details p { padding: 0 14px 12px; margin: 0; color: var(--text); }

/* Related / also-in */
.related-tools ul, .also-in ul { list-style: none; padding: 0; display: grid; gap: 8px; }
.related-tools li a, .also-in li a {
  display: block; padding: 10px 14px; background: var(--surface);
  border: 1px solid var(--border); border-radius: 8px; text-decoration: none; font-weight: 600;
}
.related-tools li a:hover, .also-in li a:hover { border-color: var(--green); }

/* Hub */
.tool-grid { display: grid; gap: 12px; margin: 20px 0; }
.tool-card { border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; background: #fff; }
.tool-card h2 { margin: 0 0 6px; font-size: 20px; }
.tool-card h2 a { text-decoration: none; color: var(--green-dark); }
.tool-card p { margin: 0; color: var(--muted); font-size: 15px; }
.tool-soon { opacity: .55; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); padding: 22px 0 40px; font-size: 14px; color: var(--muted); }
.also-from-us { margin: 0 0 8px; }
.copyright { margin: 0; }

/* Gateway */
.gateway { text-align: center; padding: 40px 18px; max-width: 560px; margin: 0 auto; }
.gateway h1 { font-size: 34px; }
.gateway-links { display: grid; gap: 10px; margin-top: 24px; }
.gateway-links a {
  display: block; padding: 14px; border-radius: var(--radius); text-decoration: none;
  background: var(--green); color: #fff; font-size: 19px; font-weight: 700;
}
.gateway-links a:hover { background: var(--green-dark); }
.gateway-links small { display: block; font-weight: 400; font-size: 14px; opacity: .85; }

@media (min-width: 640px) {
  h1 { font-size: 36px; }
  .tool-grid { grid-template-columns: 1fr 1fr; }
}

/* Responsive tables (BMI categories, worked examples) — scrolls on narrow screens */
.tool-page table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 15px; display: block; overflow-x: auto; }
.tool-page thead, .tool-page tbody { display: table; width: 100%; }
.tool-page th, .tool-page td { padding: 8px 10px; border: 1px solid var(--border); text-align: left; white-space: nowrap; }
.tool-page th { background: var(--green); color: #fff; }