:root {
  --gf-bg: #faf7ef;
  --gf-surface: #fffdf8;
  --gf-surface-2: #f2eadb;
  --gf-text: #243123;
  --gf-muted: #62705f;
  --gf-primary: #315c35;
  --gf-primary-dark: #203f25;
  --gf-accent: #c9852b;
  --gf-accent-soft: #fff1d9;
  --gf-leaf: #7e9f62;
  --gf-border: rgba(36, 49, 35, .13);
  --gf-shadow: 0 18px 50px rgba(29, 51, 31, .11);
  --gf-radius: 22px;
  --gf-radius-sm: 14px;
  --gf-max: 1160px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--gf-text);
  background: radial-gradient(circle at 18% 4%, rgba(126,159,98,.18), transparent 24rem), var(--gf-bg);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
}
a { color: var(--gf-primary); text-underline-offset: .18em; }
a:hover { color: var(--gf-primary-dark); }
img, svg { max-width: 100%; height: auto; }
.container { width: min(var(--gf-max), calc(100% - 2rem)); margin-inline: auto; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(250,247,239,.90);
  border-bottom: 1px solid var(--gf-border);
}
.navbar { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 1rem 0; }
.logo { display: flex; align-items: center; gap: .7rem; font-weight: 850; font-size: 1.1rem; text-decoration: none; color: var(--gf-text); letter-spacing: -.02em; }
.logo-mark { display: grid; place-items: center; width: 38px; height: 38px; border-radius: 12px; background: linear-gradient(135deg, var(--gf-primary), var(--gf-leaf)); color: #fff; box-shadow: var(--gf-shadow); font-weight: 900; }
.nav-links { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; }
.nav-links a { color: var(--gf-text); text-decoration: none; font-weight: 700; font-size: .96rem; }
.nav-links a:hover { color: var(--gf-primary); }
.hero { padding: 4.5rem 0 3rem; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(280px, .85fr); gap: 2.2rem; align-items: center; }
.eyebrow { display: inline-flex; align-items: center; gap: .45rem; padding: .35rem .7rem; border-radius: 999px; background: rgba(49, 92, 53, .10); color: var(--gf-primary-dark); font-weight: 800; font-size: .88rem; }
h1, h2, h3 { line-height: 1.12; letter-spacing: -.045em; margin: 0 0 1rem; }
h1 { font-size: clamp(2.6rem, 6vw, 5.3rem); max-width: 11ch; }
h2 { font-size: clamp(2rem, 3.6vw, 3.2rem); }
h3 { font-size: clamp(1.25rem, 2vw, 1.55rem); }
p { margin: 0 0 1rem; }
.lead { font-size: clamp(1.1rem, 2vw, 1.35rem); color: #42513f; max-width: 64ch; }
.btn-row { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 1.5rem; }
.btn { display: inline-flex; align-items: center; justify-content: center; gap: .5rem; min-height: 46px; padding: .78rem 1.1rem; border-radius: 999px; text-decoration: none; font-weight: 850; border: 1px solid transparent; transition: transform .16s ease, box-shadow .16s ease; }
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: var(--gf-primary); color: #fff; box-shadow: 0 12px 25px rgba(49,92,53,.22); }
.btn-primary:hover { color: #fff; background: var(--gf-primary-dark); }
.btn-secondary { background: var(--gf-surface); border-color: var(--gf-border); color: var(--gf-text); }
.btn-secondary:hover { color: var(--gf-text); box-shadow: var(--gf-shadow); }
.hero-card { background: linear-gradient(145deg, #fffdf8, #eef4e4); border: 1px solid var(--gf-border); border-radius: 30px; padding: 1.4rem; box-shadow: var(--gf-shadow); }
.formula-visual { position: relative; min-height: 380px; overflow: hidden; border-radius: 24px; background: linear-gradient(160deg, #203f25, #315c35 48%, #8f6a33); color: #fff; padding: 1.3rem; }
.formula-visual:before { content: ""; position: absolute; width: 280px; height: 280px; border-radius: 50%; background: radial-gradient(circle, rgba(255,255,255,.25), transparent 62%); top: -80px; right: -80px; }
.tree-svg { position: absolute; right: -8px; bottom: -6px; width: 74%; opacity: .95; }
.metric-card { position: relative; z-index: 1; max-width: 250px; background: rgba(255,255,255,.14); border: 1px solid rgba(255,255,255,.25); backdrop-filter: blur(8px); border-radius: 18px; padding: 1rem; margin-bottom: .8rem; }
.metric-card strong { display: block; font-size: 1.7rem; line-height: 1; margin-bottom: .25rem; }
.section { padding: 3.3rem 0; }
.section-header { max-width: 780px; margin-bottom: 1.7rem; }
.grid { display: grid; gap: 1rem; }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.card, .panel, .tool-box, .article-card, .provider-card { background: var(--gf-surface); border: 1px solid var(--gf-border); border-radius: var(--gf-radius); padding: 1.25rem; box-shadow: 0 8px 24px rgba(29,51,31,.055); }
.card h3, .article-card h3 { margin-bottom: .55rem; }
.card p, .article-card p { color: var(--gf-muted); }
.panel { background: linear-gradient(135deg, var(--gf-surface), #f2f7ea); box-shadow: var(--gf-shadow); }
.tool-box { border-left: 5px solid var(--gf-accent); }
.badge { display: inline-flex; width: fit-content; align-items: center; gap: .35rem; padding: .3rem .65rem; border-radius: 999px; background: var(--gf-accent-soft); color: #805014; font-weight: 850; font-size: .84rem; margin-bottom: .75rem; }
.muted { color: var(--gf-muted); }
.kpi-list { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .8rem; margin-top: 1.2rem; }
.kpi { background: rgba(255,255,255,.68); border: 1px solid var(--gf-border); border-radius: var(--gf-radius-sm); padding: .9rem; }
.kpi strong { display: block; color: var(--gf-primary-dark); font-size: 1.35rem; }
.table-wrap { overflow-x: auto; border-radius: 18px; border: 1px solid var(--gf-border); background: var(--gf-surface); }
table { width: 100%; border-collapse: collapse; min-width: 720px; }
th, td { text-align: left; padding: .9rem; border-bottom: 1px solid var(--gf-border); vertical-align: top; }
th { background: #edf3e5; color: var(--gf-primary-dark); }
tr:last-child td { border-bottom: 0; }
.callout { border-radius: var(--gf-radius); background: #fff7e9; border: 1px solid rgba(201,133,43,.28); padding: 1.1rem; }
.cta { background: linear-gradient(135deg, var(--gf-primary-dark), var(--gf-primary)); color: #fff; border-radius: 30px; padding: clamp(1.5rem, 4vw, 2.5rem); box-shadow: var(--gf-shadow); }
.cta h2, .cta p { color: #fff; }
.cta .btn-secondary { color: var(--gf-text); }
.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 285px; gap: 1.6rem; align-items: start; }
.toc { position: sticky; top: 88px; background: var(--gf-surface); border: 1px solid var(--gf-border); border-radius: 18px; padding: 1rem; }
.toc a { display: block; text-decoration: none; padding: .28rem 0; color: var(--gf-muted); font-weight: 650; }
.toc a:hover { color: var(--gf-primary); }
.content-card { background: var(--gf-surface); border-radius: var(--gf-radius); border: 1px solid var(--gf-border); padding: clamp(1.2rem, 3vw, 2rem); }
.answer-box { background: #eef6e7; border-left: 5px solid var(--gf-primary); padding: 1rem; border-radius: 16px; margin: 1rem 0 1.4rem; }
.calculator { display: grid; gap: .8rem; background: var(--gf-surface); border: 1px solid var(--gf-border); border-radius: var(--gf-radius); padding: 1.2rem; box-shadow: 0 8px 24px rgba(29,51,31,.055); }
.field-grid { display: grid; grid-template-columns: repeat(2, minmax(0,1fr)); gap: .8rem; }
label { display: grid; gap: .28rem; font-weight: 800; color: var(--gf-primary-dark); }
input, select { width: 100%; border: 1px solid var(--gf-border); border-radius: 12px; padding: .75rem .8rem; background: #fff; color: var(--gf-text); font: inherit; }
.result { display: none; background: #edf6e6; border: 1px solid rgba(49,92,53,.2); border-radius: 16px; padding: 1rem; }
.result.is-visible { display: block; }
.ad-slot { border: 1px dashed rgba(36,49,35,.28); background: rgba(255,255,255,.55); border-radius: 16px; color: var(--gf-muted); padding: 1rem; text-align: center; font-size: .92rem; }
.site-footer { margin-top: 3rem; padding: 2.4rem 0; border-top: 1px solid var(--gf-border); background: rgba(255,253,248,.55); }
.footer-grid { display: grid; grid-template-columns: 1.4fr .8fr .8fr; gap: 1rem; }
.footer-grid a { display: block; text-decoration: none; margin: .2rem 0; color: var(--gf-muted); }
.footer-grid a:hover { color: var(--gf-primary); }
.legal { font-size: .92rem; color: var(--gf-muted); }
@media (max-width: 900px) {
  .hero-grid, .article-layout, .footer-grid { grid-template-columns: 1fr; }
  .grid-3, .grid-4, .grid-2, .kpi-list { grid-template-columns: 1fr; }
  .toc { position: static; }
  h1 { max-width: 100%; }
}
@media (max-width: 620px) {
  .navbar { align-items: flex-start; }
  .nav-links { display: none; }
  .hero { padding-top: 2.8rem; }
  .field-grid { grid-template-columns: 1fr; }
  .formula-visual { min-height: 310px; }
}