:root {
  --calc-bg: #fff7f4;
  --calc-card: rgba(255, 255, 255, .9);
  --calc-border: rgba(51, 58, 68, .13);
  --calc-text: #1f2937;
  --calc-muted: #5f6b7a;
  --calc-green: #516526;
  --calc-green-2: #6b8434;
  --calc-rose: #904b3b;
  --calc-soft: #ffe6df;
  --calc-shadow: 0 16px 44px rgba(46, 24, 12, .1);
}

html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--calc-text);
  background:
    radial-gradient(circle at 0 0, rgba(255, 223, 211, .88), transparent 27rem),
    radial-gradient(circle at 100% 8%, rgba(107, 132, 52, .09), transparent 25rem),
    var(--calc-bg);
  font-family: Inter, system-ui, sans-serif;
}
* { box-sizing: border-box; }
a { color: var(--calc-green); }
.calc-shell { width: min(1060px, calc(100% - 32px)); margin-inline: auto; }
.calc-nav { padding: 24px 0; }
.calc-nav-inner {
  min-height: 70px; display: flex; align-items: center; justify-content: space-between;
  gap: 20px; padding: 12px 18px; border: 1px solid var(--calc-border);
  border-radius: 20px; background: rgba(255,255,255,.82); box-shadow: 0 10px 30px rgba(46,24,12,.07);
}
.calc-brand { display: flex; align-items: center; gap: 12px; color: var(--calc-text); text-decoration: none; }
.calc-brand img { width: 48px; height: 48px; object-fit: contain; border-radius: 12px; }
.calc-brand strong, .calc-brand span { display: block; }
.calc-brand span { margin-top: 2px; color: var(--calc-muted); font-size: .78rem; }
.calc-nav-links { display: flex; gap: 18px; align-items: center; }
.calc-nav-links a { font-weight: 700; text-decoration: none; }
.calc-button {
  display: inline-flex; align-items: center; justify-content: center; min-height: 48px;
  padding: 0 20px; border: 0; border-radius: 14px; cursor: pointer; font: inherit;
  font-weight: 800; text-decoration: none; color: white;
  background: linear-gradient(135deg, var(--calc-green), var(--calc-green-2));
  box-shadow: 0 12px 26px rgba(81,101,38,.22);
}
.calc-button.secondary { color: var(--calc-text); background: white; border: 1px solid var(--calc-border); box-shadow: none; }
.calc-hero { padding: 42px 0 60px; }
.calc-breadcrumb { margin-bottom: 24px; color: var(--calc-muted); font-size: .9rem; }
.calc-breadcrumb a { text-decoration: none; }
.calc-eyebrow { color: var(--calc-rose); font-size: .8rem; font-weight: 800; letter-spacing: .11em; text-transform: uppercase; }
.calc-hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; align-items: center; gap: 48px; }
h1, h2, h3 { font-family: Poppins, Inter, sans-serif; letter-spacing: -.035em; }
h1 { margin: 12px 0 20px; max-width: 780px; font-size: clamp(2.5rem, 5.4vw, 4.8rem); line-height: 1.03; }
h1 span { color: var(--calc-green); }
.calc-lead { max-width: 760px; color: var(--calc-muted); font-size: 1.08rem; line-height: 1.75; }
.calc-meta { color: var(--calc-muted); font-size: .85rem; }
.calculator-card, .article-card, .related-card {
  border: 1px solid var(--calc-border); border-radius: 26px; background: var(--calc-card); box-shadow: var(--calc-shadow);
}
.calculator-card { padding: 26px; }
.calculator-card h2 { margin: 0 0 6px; font-size: 1.55rem; }
.calculator-card > p { margin-top: 0; color: var(--calc-muted); line-height: 1.55; }
.form-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 15px; }
.form-field.full { grid-column: 1 / -1; }
.form-field label { display: block; margin-bottom: 7px; font-size: .88rem; font-weight: 800; }
.form-field input, .form-field select {
  width: 100%; min-height: 48px; padding: 10px 12px; color: var(--calc-text); background: white;
  border: 1px solid rgba(51,58,68,.2); border-radius: 12px; font: inherit;
}
.form-field input:focus, .form-field select:focus { outline: 3px solid rgba(107,132,52,.16); border-color: var(--calc-green-2); }
.form-actions { margin-top: 18px; }
.calc-result { display: none; margin-top: 20px; padding: 18px; border-radius: 18px; background: #f2f6e9; border: 1px solid rgba(81,101,38,.2); }
.calc-result.show { display: block; }
.calc-result strong.result-main { display: block; color: var(--calc-green); font-family: Poppins, sans-serif; font-size: 2rem; }
.calc-result.warning { background: #fff2d8; border-color: rgba(202, 127, 31, .35); }
.calc-result.warning strong.result-main { color: #a65f13; }
.calc-result p { margin: 6px 0 0; line-height: 1.55; }
.result-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; margin-top: 14px; }
.result-stat { padding: 12px; border-radius: 12px; background: white; }
.result-stat.healthy { border-left: 4px solid var(--calc-green); }
.result-stat.warning { border-left: 4px solid #d58a2a; background: #fffaf0; }
.result-stat span { display: block; color: var(--calc-muted); font-size: .78rem; }
.result-stat strong { display: block; margin-top: 3px; }
.calc-note { margin-top: 14px; color: var(--calc-muted); font-size: .79rem; line-height: 1.5; }
.content-section { padding: 34px 0; }
.article-card { padding: clamp(24px, 5vw, 54px); }
.article-card h2 { margin: 38px 0 12px; font-size: clamp(1.7rem, 3vw, 2.45rem); }
.article-card h2:first-child { margin-top: 0; }
.article-card h3 { margin: 28px 0 10px; font-size: 1.3rem; }
.article-card p, .article-card li { color: var(--calc-muted); font-size: 1.02rem; line-height: 1.8; }
.article-card strong { color: var(--calc-text); }
.formula { margin: 22px 0; padding: 20px; overflow-wrap: anywhere; border-left: 4px solid var(--calc-green); border-radius: 0 14px 14px 0; background: #f2f6e9; font-weight: 800; }
.info-box { margin: 24px 0; padding: 20px; border-radius: 16px; background: var(--calc-soft); color: #68382d; line-height: 1.65; }
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; margin: 18px 0 26px; }
th, td { padding: 13px; border-bottom: 1px solid var(--calc-border); text-align: left; }
th { color: var(--calc-text); background: #f8f5f1; }
td { color: var(--calc-muted); }
.faq details { padding: 18px 0; border-bottom: 1px solid var(--calc-border); }
.faq summary { cursor: pointer; font-weight: 800; }
.faq details p { margin-bottom: 0; }
.source-list { font-size: .92rem; }
.related { padding: 36px 0 72px; }
.related h2 { font-size: clamp(1.8rem, 3vw, 2.5rem); }
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.related-card { padding: 22px; color: var(--calc-text); text-decoration: none; }
.related-card span { color: var(--calc-rose); font-size: .78rem; font-weight: 800; text-transform: uppercase; }
.related-card h3 { margin: 9px 0; font-size: 1.15rem; }
.related-card p { margin-bottom: 0; color: var(--calc-muted); line-height: 1.55; }
.calc-cta { margin-bottom: 60px; padding: 34px; color: white; border-radius: 26px; background: linear-gradient(135deg, var(--calc-green), var(--calc-green-2)); }
.calc-cta h2 { margin: 0; font-size: clamp(1.7rem, 3vw, 2.5rem); }
.calc-cta p { max-width: 720px; color: rgba(255,255,255,.85); line-height: 1.65; }
.calc-cta .calc-button { color: var(--calc-green); background: white; }
@media (max-width: 820px) {
  .calc-hero-grid { grid-template-columns: 1fr; }
  .calc-nav-links a:not(.calc-button) { display: none; }
  .related-grid { grid-template-columns: 1fr; }
}
@media (max-width: 520px) {
  .form-grid, .result-grid { grid-template-columns: 1fr; }
  .form-field.full { grid-column: auto; }
  .calc-brand span { display: none; }
  .calc-nav-inner { padding: 10px 12px; }
  .calc-button { padding-inline: 15px; }
  h1 { font-size: 2.35rem; }
  .calculator-card { padding: 20px; }
}