:root {
  --paper: #efe6d4;
  --paper-2: #e7dcc4;
  --ink: #1c1712;
  --ink-soft: #4a433a;
  --rule: rgba(28, 23, 18, 0.12);
  --rule-strong: rgba(28, 23, 18, 0.22);
  --forest: #1e5c48;
  --forest-2: #164536;
  --marker: #c4452d;
  --gold: #9a6b12;
  --white: #fbf7ee;
  --shadow: 0 24px 60px rgba(28, 23, 18, 0.12);
  --serif: "Fraunces", "Times New Roman", serif;
  --sans: "Public Sans", "Helvetica Neue", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background:
    linear-gradient(180deg, rgba(30, 92, 72, 0.05), transparent 28%),
    repeating-linear-gradient(
      to bottom,
      transparent,
      transparent 27px,
      var(--rule) 28px
    ),
    var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.5;
  min-height: 100vh;
}
.page-rule {
  position: fixed;
  inset: 0 auto 0 72px;
  width: 1px;
  background: var(--rule-strong);
  pointer-events: none;
  z-index: 2;
}
a { color: var(--forest); }
h1, h2, h3 {
  font-family: var(--serif);
  font-weight: 650;
  letter-spacing: -0.03em;
  line-height: 1.12;
  margin: 0 0 0.4em;
}
p { margin: 0 0 0.8em; }
.eyebrow, .kicker {
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold);
  font-weight: 600;
  margin-bottom: 0.6rem;
}

.site-header, .site-footer, main, .flash-wrap {
  width: min(1120px, calc(100% - 48px));
  margin-left: auto;
  margin-right: auto;
}
.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.4rem 0 1rem;
  position: relative;
  z-index: 3;
}
.wordmark {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--serif);
  font-weight: 720;
  font-size: 1.35rem;
  color: var(--ink);
  text-decoration: none;
}
.wordmark.small { font-size: 1.05rem; }
.mark {
  width: 14px;
  height: 28px;
  background:
    linear-gradient(var(--ink), var(--ink)) 0 0 / 100% 2px no-repeat,
    linear-gradient(var(--marker), var(--marker)) 0 50% / 70% 2px no-repeat,
    linear-gradient(var(--ink), var(--ink)) 0 100% / 100% 2px no-repeat,
    linear-gradient(var(--ink), var(--ink)) 0 0 / 2px 100% no-repeat;
}
nav { display: flex; gap: 1.1rem; align-items: center; }
nav a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
}
nav a:hover { color: var(--ink); }
.nav-lab {
  background: var(--ink);
  color: var(--white) !important;
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
}

.flash-wrap { margin-bottom: 0.5rem; }
.flash {
  background: var(--white);
  border-left: 4px solid var(--forest);
  padding: 0.8rem 1rem;
  box-shadow: var(--shadow);
}
.flash-error, .flash-warning { border-left-color: var(--marker); }

.hero {
  display: grid;
  grid-template-columns: 1fr 1.05fr;
  gap: 2.5rem;
  align-items: start;
  padding: 1.5rem 0 3rem;
}
.hero h1, .page-intro h1, .result-hero h1 {
  font-size: clamp(2.4rem, 6vw, 4.4rem);
  font-variation-settings: "opsz" 80;
}
.lede { font-size: 1.15rem; color: var(--ink-soft); max-width: 40rem; }
.truths {
  display: flex;
  gap: 1.2rem;
  padding: 0;
  list-style: none;
  margin: 1.4rem 0 0;
}
.truths li {
  background: var(--white);
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--rule-strong);
  font-size: 0.92rem;
}

.calc {
  background: var(--white);
  padding: 1.3rem 1.35rem 1.4rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--rule-strong);
}
.calc-top, .sex-row, .units, .grid-2 {
  display: flex;
  gap: 0.7rem;
}
.calc-top { justify-content: space-between; align-items: baseline; }
.units label, .chip {
  border: 1px solid var(--rule-strong);
  padding: 0.45rem 0.75rem;
  cursor: pointer;
  font-size: 0.85rem;
  background: var(--paper);
  position: relative;
  text-align: center;
}
.chip { flex: 1; }
.chip input, .units input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
  width: 0;
  height: 0;
}
.chip:has(input:checked), .units label:has(input:checked) {
  background: var(--forest);
  color: var(--white);
  border-color: var(--forest);
}
fieldset {
  border: 0;
  margin: 1rem 0 0;
  padding: 0;
}
legend {
  font-family: var(--serif);
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
}
label {
  display: flex;
  flex-direction: column;
  gap: 0.28rem;
  font-size: 0.82rem;
  font-weight: 600;
  flex: 1;
}
.hint { font-weight: 400; color: var(--ink-soft); }
input[type="number"], input[type="text"], input[type="email"], input[type="password"] {
  font: inherit;
  font-weight: 400;
  padding: 0.55rem 0.6rem;
  border: 1px solid var(--rule-strong);
  background: var(--paper);
  color: var(--ink);
}
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; }
.btn-primary, .btn-ghost {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  border: 0;
  cursor: pointer;
  font: inherit;
  font-weight: 600;
  padding: 0.85rem 1.1rem;
  margin-top: 1rem;
}
.btn-primary { background: var(--marker); color: #fff; width: 100%; }
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--ink);
}
.form-note, .fine, .cite, .authors, .source {
  font-size: 0.82rem;
  color: var(--ink-soft);
}

.strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  padding-bottom: 3rem;
}
.strip article, .stat-row article, .method-grid article, .parent-grid article,
.pillar, .protocol, .study-list article, .pricing article, .teaser-list article {
  background: var(--white);
  border: 1px solid var(--rule-strong);
  padding: 1.1rem 1.15rem;
}

.result-hero { padding: 1rem 0 0.5rem; }
.giant {
  font-family: var(--serif);
  font-size: clamp(3rem, 8vw, 6.2rem);
  font-weight: 720;
  line-height: 0.95;
  margin: 0.2rem 0;
}
.giant-sub { font-size: 1.15rem; }
.stat-row, .method-grid, .parent-grid, .pillar-grid, .pricing {
  display: grid;
  gap: 1rem;
  margin: 1.5rem 0 2rem;
}
.stat-row, .parent-grid { grid-template-columns: repeat(3, 1fr); }
.method-grid, .pillar-grid { grid-template-columns: repeat(2, 1fr); }
.pricing { grid-template-columns: repeat(3, 1fr); align-items: stretch; }
.method-grid .is-primary, .pricing .featured {
  background: var(--forest);
  color: var(--white);
  border-color: var(--forest);
}
.method-grid .is-primary .num, .price {
  font-family: var(--serif);
  font-size: 1.8rem;
}
.price span { font-size: 1rem; font-family: var(--sans); }

.chart-panel {
  background: var(--white);
  border: 1px solid var(--rule-strong);
  padding: 1rem 1rem 0.4rem;
  margin: 1.5rem 0 2rem;
}
#growth-chart { width: 100%; height: auto; display: block; }

.cta-band, .locked-preview {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 1.5rem;
  background: var(--ink);
  color: var(--white);
  padding: 1.8rem;
  margin: 1rem 0 3rem;
}
.cta-band a, .locked-preview .btn-primary { width: auto; }
.cta-actions { display: flex; flex-direction: column; justify-content: center; }
.cta-band .btn-ghost, .locked-copy .btn-ghost { color: var(--white); border-color: var(--white); }

.page-intro { padding: 1.2rem 0 0.4rem; max-width: 46rem; }
.callout, .band-note {
  background: var(--white);
  border-left: 4px solid var(--gold);
  padding: 0.9rem 1rem;
}
.pillar ul, .pricing ul, .truths { padding-left: 1.1rem; }
.locked-preview { background: var(--forest-2); }
.teaser-list { display: grid; gap: 0.7rem; }
.is-locked { opacity: 0.72; filter: saturate(0.7); }
.protocol-list { display: grid; gap: 1rem; padding-bottom: 3rem; }
.protocol ol { padding-left: 1.2rem; }
.protocol .sub { color: var(--ink-soft); font-size: 1.05rem; }
.avoid {
  background: var(--paper);
  padding: 0.75rem 0.85rem;
  border-left: 3px solid var(--marker);
}
.study-list { display: grid; gap: 0.9rem; padding-bottom: 3rem; }
.study-list h2 { font-size: 1.35rem; }
.auth-card {
  max-width: 28rem;
  background: var(--white);
  border: 1px solid var(--rule-strong);
  padding: 1.3rem 1.25rem;
  margin: 0 0 3rem;
  display: grid;
  gap: 0.85rem;
}
.auth-card .btn-primary,
.auth-card .btn-ghost { width: 100%; margin-top: 0; }
.auth-card form { display: grid; gap: 0.6rem; }
button:disabled { opacity: 0.45; cursor: not-allowed; }

.site-footer {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 2rem;
  padding: 2rem 0 3rem;
  border-top: 1px solid var(--rule-strong);
  color: var(--ink-soft);
}

@media (max-width: 860px) {
  .page-rule { display: none; }
  .hero, .strip, .stat-row, .method-grid, .parent-grid, .pillar-grid,
  .pricing, .cta-band, .locked-preview, .site-footer {
    grid-template-columns: 1fr;
  }
  .site-header {
    flex-wrap: wrap;
    gap: 0.8rem;
  }
  nav { flex-wrap: wrap; }
  .truths { flex-direction: column; }
}