:root {
  --ink: #111;
  --paper: #f6f3ec;
  --line: #1a1a1a;
  --muted: #57534a;
  --accent: #0a6b2e;
  --pop: #d63a1f;
  --soft: rgba(0,0,0,0.08);
}
* , *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: ui-sans-serif, system-ui, -apple-system, "Helvetica Neue", Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  line-height: 1.5;
}
a { color: inherit; }

/* ---------- Header ---------- */
.site-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 18px 28px;
  border-bottom: 1px solid var(--soft);
  position: sticky; top: 0; background: var(--paper); z-index: 50;
}
.logo {
  font-weight: 800; letter-spacing: 0.04em; text-decoration: none;
  font-size: 14px;
}
.primary-nav {
  display: flex; gap: 22px;
  font-size: 13px; text-transform: uppercase; letter-spacing: 0.08em;
}
.primary-nav a { text-decoration: none; color: var(--muted); }
.primary-nav a:hover { color: var(--ink); }
.nav-toggle {
  display: none; background: none; border: 1.5px solid var(--line);
  padding: 8px 10px; font-size: 14px; font-weight: 700;
  letter-spacing: 0.08em; text-transform: uppercase; cursor: pointer;
  color: var(--ink); font-family: inherit;
}
@media (max-width: 720px) {
  .nav-toggle { display: inline-flex; align-items: center; gap: 6px; }
  .primary-nav {
    display: none; position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; gap: 0; background: var(--paper);
    border-bottom: 1px solid var(--soft); padding: 8px 0;
  }
  .primary-nav.open { display: flex; }
  .primary-nav a { padding: 14px 28px; font-size: 14px; border-top: 1px solid var(--soft); }
  .primary-nav a:first-child { border-top: none; }
  .site-header { position: relative; }
}

/* ---------- Article inline CTA ---------- */
.article-cta {
  margin: 48px 0; padding: 28px;
  border: 2px solid var(--line); background: var(--paper);
  display: flex; flex-direction: column; gap: 14px; align-items: flex-start;
}
.article-cta-headline {
  font-size: 22px; font-weight: 800; letter-spacing: -0.01em; margin: 0;
}
.article-cta-line { font-size: 15px; color: var(--muted); margin: 0; }
.article-cta-row { display: flex; align-items: baseline; gap: 12px; }
.article-cta-price { font-size: 32px; font-weight: 800; letter-spacing: -0.02em; }
.article-cta-price-unit { font-size: 13px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; }
.article-cta-btn {
  display: inline-block; padding: 12px 22px;
  background: var(--ink); color: var(--paper); text-decoration: none;
  font-weight: 700; font-size: 14px; letter-spacing: 0.06em;
  text-transform: uppercase; border: 1.5px solid var(--line);
}
.article-cta-btn:hover { background: transparent; color: var(--ink); }

/* ---------- Article meta (author + date) ---------- */
.article-meta {
  font-size: 12px; color: var(--muted); letter-spacing: 0.06em;
  text-transform: uppercase; margin: 0 0 24px;
}
.article-meta a { color: inherit; text-decoration: none; border-bottom: 1px dotted currentColor; }

/* ---------- Back to top ---------- */
.back-to-top {
  position: fixed; bottom: 24px; right: 24px;
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--ink); color: var(--paper);
  border: 1.5px solid var(--line); cursor: pointer;
  font-size: 18px; line-height: 1;
  display: none; align-items: center; justify-content: center;
  z-index: 60; box-shadow: 0 2px 8px rgba(0,0,0,0.15);
  text-decoration: none;
}
.back-to-top.show { display: flex; }
.back-to-top:hover { transform: translateY(-2px); }

/* ---------- FAQ details/summary ---------- */
.article .faq details {
  border: 1px solid var(--soft); padding: 14px 18px;
  margin-bottom: 10px;
}
.article .faq summary {
  cursor: pointer; font-weight: 700; font-size: 16px;
  list-style: none; outline: none;
}
.article .faq summary::-webkit-details-marker { display: none; }
.article .faq summary::before {
  content: "+"; display: inline-block; width: 20px;
  font-weight: 400; color: var(--muted);
}
.article .faq details[open] summary::before { content: "−"; }
.article .faq details[open] summary { margin-bottom: 10px; }
.article .faq p { margin: 0; color: var(--muted); }
.article .faq h2 { margin-top: 56px; }

main { max-width: 1080px; margin: 0 auto; padding: 24px; }

/* ---------- Hero ---------- */
.hero { text-align: center; padding: 56px 16px 32px; }
.badge {
  font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--muted); margin-bottom: 28px;
}
.badge .dot {
  display: inline-block; width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent); margin-right: 8px; vertical-align: 1px;
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.4} }
.mark { width: min(36vw, 160px); margin-bottom: 24px; opacity: .92; }
h1 {
  font-size: clamp(34px, 5.6vw, 64px);
  letter-spacing: -0.025em; line-height: 1.04;
  margin: 0 0 18px; font-weight: 800;
  max-width: 20ch; margin-left: auto; margin-right: auto;
}
.tag {
  font-size: clamp(18px, 2.4vw, 24px);
  font-weight: 500; margin: 0 0 8px; font-style: italic;
  color: var(--muted);
}

/* ---------- Tether pop ---------- */
.tether-pop {
  margin: 48px 0;
  display: flex; justify-content: center;
}
.tether-pop-inner {
  display: flex; align-items: center; gap: 28px;
  max-width: 760px;
  padding: 28px 32px;
  background: var(--ink); color: var(--paper);
  border: 2px solid var(--ink);
  position: relative;
}
.tether-pop-inner::before {
  content: "";
  position: absolute; inset: -8px;
  border: 2px dashed var(--ink);
  pointer-events: none;
}
.tether-label {
  font-size: clamp(40px, 7vw, 72px);
  font-weight: 900; letter-spacing: -0.03em;
  line-height: 1; color: var(--pop);
  text-shadow: 2px 2px 0 var(--paper);
  flex-shrink: 0;
}
.tether-line {
  margin: 0; font-size: clamp(15px, 1.8vw, 18px);
  line-height: 1.5;
}
@media (max-width: 600px) {
  .tether-pop-inner { flex-direction: column; text-align: center; }
}

/* ---------- Features ---------- */
.features {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px;
  margin: 64px 0;
}
.feature {
  border: 1.5px solid var(--line); padding: 24px 20px;
  display: flex; flex-direction: column;
}
.feature-icon { font-size: 28px; margin-bottom: 12px; }
.feature-glyph { width: 48px; height: 48px; margin-bottom: 14px; color: var(--ink); }
.feature-glyph text { font-family: ui-sans-serif, system-ui, sans-serif; }
.feature h3 { margin: 0 0 8px; font-size: 17px; font-weight: 700; letter-spacing: -0.01em; }
.feature p { margin: 0 0 14px; font-size: 14px; color: var(--muted); flex: 1; }
.feature a { font-size: 13px; font-weight: 600; text-decoration: none; border-bottom: 1px solid currentColor; align-self: flex-start; }
@media (max-width: 800px) { .features { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .features { grid-template-columns: 1fr; } }

/* ---------- Heights ---------- */
.heights-section { text-align: center; margin: 72px 0; }
.heights-section h2 {
  font-size: clamp(24px, 3.6vw, 34px);
  margin: 0 0 24px; letter-spacing: -0.02em;
}
.heights {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 16px; max-width: 640px; margin: 0 auto 20px;
}
.h-card {
  border: 1.5px solid var(--line); padding: 20px 14px;
  text-align: center;
}
.h-card .club {
  font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--muted); margin-bottom: 6px;
}
.h-card .height { font-size: clamp(28px, 4vw, 36px); font-weight: 800; letter-spacing: -0.02em; }
.h-card .qty { font-size: 11px; color: var(--muted); margin-top: 4px; letter-spacing: 0.04em; }
.h-link {
  display: inline-block; margin-top: 10px;
  font-size: 12px; text-decoration: none; color: var(--muted);
  border-bottom: 1px solid currentColor;
}
.h-link:hover { color: var(--ink); }
.heights-foot { font-size: 14px; color: var(--muted); max-width: 540px; margin: 12px auto 0; }
.heights-foot a { color: var(--ink); border-bottom: 1px solid var(--ink); text-decoration: none; }
@media (max-width: 540px) { .heights { grid-template-columns: 1fr; } }

/* ---------- CTA ---------- */
.cta-section { margin: 64px 0; display: flex; flex-direction: column; align-items: center; }
.price-row { display: flex; align-items: baseline; gap: 10px; margin-bottom: 20px; }
.price { font-size: clamp(40px, 6vw, 56px); font-weight: 800; letter-spacing: -0.02em; }
.price-unit { font-size: 13px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.08em; }
.cta-row { display: flex; flex-direction: column; gap: 10px; width: 100%; max-width: 440px; }
.btn {
  padding: 16px 22px; font-size: 16px; font-weight: 700;
  background: var(--ink); color: var(--paper);
  border: 1.5px solid var(--line); border-radius: 0;
  cursor: pointer; font-family: inherit; text-decoration: none;
  text-transform: uppercase; letter-spacing: 0.06em;
  text-align: center; display: inline-block; width: 100%;
  transition: background .12s, color .12s;
}
.btn:hover { background: transparent; color: var(--ink); }
.btn.disabled { opacity: .4; cursor: not-allowed; pointer-events: none; }
.btn-secondary { background: transparent; color: var(--ink); }
.btn-secondary:hover { background: var(--ink); color: var(--paper); }
form#notify { display: flex; gap: 8px; flex-wrap: wrap; }
input[type=email] {
  flex: 1 1 220px; min-width: 0; padding: 14px 16px; font-size: 16px;
  background: transparent; color: var(--ink); border: 1.5px solid var(--line);
  border-radius: 0; font-family: inherit;
}
input[type=email]:focus { outline: 2px solid var(--ink); outline-offset: 1px; }
.sub { font-size: 13px; color: var(--muted); margin: 6px 0 0; text-align: center; }
.status { margin-top: 12px; font-size: 14px; min-height: 20px; color: var(--muted); text-align: center; }
.status.ok { color: var(--accent); }
.status.err { color: #9b1a1a; }

/* ---------- Proverb ---------- */
.proverb {
  margin: 80px auto; max-width: 640px; text-align: center;
  padding: 32px; border-top: 1px solid var(--soft); border-bottom: 1px solid var(--soft);
}
.proverb blockquote { margin: 0 0 12px; font-size: clamp(20px, 2.8vw, 26px); font-style: italic; }
.proverb cite { display: block; margin-top: 12px; font-size: 13px; font-style: normal; color: var(--muted); letter-spacing: 0.04em; }
.proverb p { font-size: 14px; color: var(--muted); margin: 0; }

/* ---------- Content index ---------- */
.content-index { margin: 64px 0; }
.content-index h2 {
  font-size: clamp(22px, 3vw, 28px);
  margin: 0 0 28px; letter-spacing: -0.02em;
}
.content-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 24px; }
.content-col h4 {
  font-size: 12px; text-transform: uppercase; letter-spacing: 0.1em;
  margin: 0 0 12px; font-weight: 700;
}
.content-col h4 a { text-decoration: none; border-bottom: 1.5px solid currentColor; }
.content-col ul { list-style: none; padding: 0; margin: 0; font-size: 13px; }
.content-col li { margin-bottom: 6px; }
.content-col li a { color: var(--muted); text-decoration: none; }
.content-col li a:hover { color: var(--ink); }
@media (max-width: 900px) { .content-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .content-grid { grid-template-columns: 1fr; } }

/* ---------- Price compare + countdown chip ---------- */
.price-compare {
  font-size: 14px; color: var(--muted); margin: -8px 0 24px;
  max-width: 32ch; text-align: center;
}
.countdown-chip {
  display: inline-flex; flex-direction: column; align-items: center;
  padding: 18px 28px; border: 2px solid var(--line);
  background: var(--paper); margin-bottom: 4px;
  width: 100%; max-width: 440px; gap: 4px;
}
.countdown-label {
  font-size: 11px; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--muted); font-weight: 700;
}
.countdown-time {
  font-size: 22px; font-weight: 800; letter-spacing: -0.01em;
}
.countdown-relative { font-size: 13px; color: var(--muted); font-weight: 500; }

/* ---------- Form trust ---------- */
.form-label {
  display: block; font-size: 13px; color: var(--muted);
  margin-bottom: 8px; letter-spacing: 0.02em;
}
.form-row { display: flex; gap: 8px; flex-wrap: wrap; }
.form-privacy {
  font-size: 12px; color: var(--muted); margin: 10px 0 0;
}
.form-privacy a { color: inherit; }

/* ---------- America strip ---------- */
.america-strip {
  margin-top: 22px; font-size: 12px; letter-spacing: 0.18em;
  color: var(--muted); display: inline-flex; gap: 10px; align-items: center;
}
.america-strip .usa { font-weight: 700; }
.america-strip .dot-sep { opacity: 0.5; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--soft); padding: 32px 24px;
  display: flex; flex-direction: column; gap: 10px; align-items: center;
  font-size: 12px; color: var(--muted); letter-spacing: 0.04em;
  text-align: center;
}
.footer-row { display: flex; gap: 14px; flex-wrap: wrap; justify-content: center; align-items: center; }
.footer-links { display: flex; gap: 18px; flex-wrap: wrap; justify-content: center; }
.footer-links a { color: var(--muted); text-decoration: none; }
.footer-links a:hover { color: var(--ink); }
.footer-meta a { color: var(--muted); text-decoration: none; }
.footer-meta a:hover { color: var(--ink); }
.footer-meta .sep { opacity: 0.4; }
.usa-foot { letter-spacing: 0.16em; font-weight: 600; padding-top: 8px; }

/* ---------- Content page (used by /why-tethered etc.) ---------- */
.article {
  max-width: 720px; margin: 48px auto; padding: 0 24px;
  font-size: 17px; line-height: 1.65;
}
.article .breadcrumb {
  font-size: 12px; color: var(--muted); text-transform: uppercase;
  letter-spacing: 0.08em; margin-bottom: 24px;
}
.article .breadcrumb a { color: inherit; text-decoration: none; border-bottom: 1px dotted currentColor; }
.article h1 {
  font-size: clamp(32px, 4.8vw, 48px); letter-spacing: -0.025em;
  margin: 0 0 16px; max-width: none; text-align: left;
}
.article .lead {
  font-size: clamp(18px, 2vw, 22px); color: var(--muted);
  margin: 0 0 36px; line-height: 1.5; font-weight: 400;
}
.article h2 {
  font-size: clamp(22px, 2.6vw, 28px); margin: 48px 0 12px;
  letter-spacing: -0.02em;
}
.article h3 {
  font-size: 18px; margin: 32px 0 8px; font-weight: 700;
}
.article p { margin: 0 0 16px; }
.article ul { margin: 0 0 20px; padding-left: 22px; }
.article li { margin-bottom: 6px; }
.article blockquote {
  margin: 24px 0; padding: 0 0 0 20px;
  border-left: 3px solid var(--ink);
  font-style: italic; color: var(--muted);
}
.article .next-up {
  margin: 56px 0 0; padding: 28px; background: rgba(0,0,0,0.03);
  border: 1px solid var(--soft);
}
.article .next-up h4 {
  margin: 0 0 12px; font-size: 12px; text-transform: uppercase;
  letter-spacing: 0.1em; color: var(--muted);
}
.article .next-up ul { margin: 0; padding-left: 18px; }
.article .next-up li { font-size: 15px; }
.article .next-up a { color: inherit; text-decoration: none; border-bottom: 1px solid currentColor; }

@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f1ece2; --paper: #15140f; --line: #f1ece2; --muted: #8e887e;
    --accent: #34c46a; --pop: #ff5a3a; --soft: rgba(255,255,255,0.1);
  }
}