/* Go Serif! shared inner-page styles: same tokens as the homepage. */
:root {
  --void: #030710;
  --void-2: #060d1b;
  --panel: rgba(13, 24, 44, 0.55);
  --panel-edge: rgba(94, 234, 212, 0.14);
  --text: #e8f0f6;
  --text-dim: #93a3b8;
  --text-faint: #56677e;
  --cyan: #4be0c8;
  --blue: #4f9dff;
  --glow: rgba(75, 224, 200, 0.55);
  --serif: "Instrument Serif", Georgia, serif;
  --sans: "Outfit", "Avenir Next", sans-serif;
  --mono: "JetBrains Mono", "SF Mono", monospace;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  font-weight: 300;
  background:
    radial-gradient(900px 600px at 80% -10%, rgba(79, 157, 255, 0.10), transparent 60%),
    radial-gradient(1000px 700px at -10% 40%, rgba(75, 224, 200, 0.07), transparent 60%),
    var(--void);
  color: var(--text);
  font-size: 16.5px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
::selection { background: var(--cyan); color: var(--void); }

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 300;
  background: var(--cyan); color: var(--void);
  padding: 10px 18px; font-family: var(--mono); font-size: 0.8rem;
}
.skip-link:focus { left: 12px; top: 12px; }

a:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 4px;
}

.wrap { max-width: 980px; margin: 0 auto; padding: 0 28px; }

/* ---------- header / nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(3, 7, 16, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(94, 234, 212, 0.1);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 18px; padding: 14px 28px; max-width: 1200px; margin: 0 auto;
}
.wordmark {
  font-family: var(--serif); font-size: 1.45rem; text-decoration: none;
  color: var(--text); display: inline-flex; align-items: center; gap: 10px; flex-shrink: 0;
}
.wordmark em { font-style: italic; color: var(--cyan); text-shadow: 0 0 18px var(--glow); }
.wordmark .mark { width: 28px; height: 28px; border-radius: 8px; border: 1px solid rgba(94, 234, 212, 0.2); }
.nav-links { display: flex; gap: 22px; align-items: center; }
.nav-links a {
  font-family: var(--mono); font-size: 0.64rem; text-transform: uppercase;
  letter-spacing: 0.14em; text-decoration: none; color: var(--text-dim);
}
.nav-links a:hover { color: var(--cyan); }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px;
  font-family: var(--mono); font-size: 0.7rem; text-transform: uppercase;
  letter-spacing: 0.14em; text-decoration: none; padding: 13px 26px;
  border-radius: 999px; border: 1px solid rgba(94, 234, 212, 0.35);
  color: var(--cyan); background: rgba(75, 224, 200, 0.06); cursor: pointer;
  transition: background 0.25s, box-shadow 0.25s;
}
.btn:hover { background: rgba(75, 224, 200, 0.14); box-shadow: 0 0 30px rgba(75, 224, 200, 0.25); }
.btn-solid {
  background: linear-gradient(96deg, var(--cyan), var(--blue));
  color: var(--void); border: none; font-weight: 500;
  box-shadow: 0 0 24px rgba(75, 224, 200, 0.35);
}
.btn-solid:hover { box-shadow: 0 0 44px rgba(75, 224, 200, 0.55); }
.nav-links a.btn-solid { color: var(--void); }

.menu-toggle {
  display: none; background: none; border: 1px solid rgba(94, 234, 212, 0.3);
  border-radius: 9px; color: var(--cyan); width: 42px; height: 42px;
  font-size: 1.1rem; cursor: pointer;
}
#mobile-menu {
  border-top: 1px solid rgba(94, 234, 212, 0.12);
  background: rgba(3, 7, 16, 0.97); padding: 18px 28px 26px;
}
#mobile-menu ul { list-style: none; display: flex; flex-direction: column; gap: 4px; }
#mobile-menu a {
  display: block; padding: 12px 4px; text-decoration: none;
  font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--text-dim);
  border-bottom: 1px solid rgba(94, 234, 212, 0.08);
}
#mobile-menu a:hover { color: var(--cyan); }
#mobile-menu .btn-solid { margin-top: 14px; color: var(--void); border-bottom: none; text-align: center; }

/* ---------- page scaffolding ---------- */
main { padding: 64px 0 90px; }
.marker {
  font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.22em;
  text-transform: uppercase; color: var(--cyan);
  display: inline-flex; align-items: center; gap: 12px; margin-bottom: 26px;
  padding: 7px 16px; border: 1px solid rgba(94, 234, 212, 0.25);
  border-radius: 999px; background: rgba(75, 224, 200, 0.05);
}
.marker::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%;
  background: var(--cyan); box-shadow: 0 0 10px var(--glow);
}
h1, h2, h3 { font-family: var(--serif); font-weight: 400; line-height: 1.12; letter-spacing: 0.005em; }
h1 { font-size: clamp(2.3rem, 5.4vw, 3.6rem); max-width: 22ch; margin-bottom: 22px; }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.4rem); margin: 64px 0 16px; max-width: 26ch; }
h3 { font-size: 1.3rem; margin: 34px 0 10px; }
h1 em, h2 em { font-style: italic; color: var(--cyan); }
p { color: var(--text-dim); max-width: 68ch; margin-bottom: 14px; }
.lede { font-size: 1.12rem; color: var(--text-dim); max-width: 62ch; }
strong { color: var(--text); font-weight: 500; }
main a { color: var(--cyan); text-decoration: underline; text-decoration-color: rgba(75, 224, 200, 0.4); text-underline-offset: 3px; }
main a:hover { text-decoration-color: var(--cyan); }
main a.btn, main a.btn-solid { text-decoration: none; }

ul.list, ol.list { margin: 6px 0 18px; padding-left: 0; list-style: none; max-width: 68ch; }
ul.list li, ol.list li {
  padding: 9px 0 9px 24px; position: relative;
  border-bottom: 1px solid rgba(94, 234, 212, 0.08); color: var(--text-dim);
}
ul.list li::before { content: "▸"; position: absolute; left: 2px; color: var(--cyan); }
ol.list { counter-reset: li; }
ol.list li { counter-increment: li; padding-left: 34px; }
ol.list li::before {
  content: counter(li, decimal-leading-zero); position: absolute; left: 0;
  font-family: var(--mono); font-size: 0.7rem; color: var(--cyan); top: 12px;
}

.tag {
  font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--cyan); display: block; margin-bottom: 10px;
}
.rule { border: none; height: 1px; background: rgba(94, 234, 212, 0.12); margin: 52px 0; }

.panel {
  border: 1px solid var(--panel-edge); border-radius: 14px;
  background: var(--panel); padding: 30px 28px; margin: 22px 0;
}
.panel-quiet { background: rgba(6, 13, 27, 0.5); }

.example-flow {
  border-left: 2px solid var(--cyan); border-radius: 0 12px 12px 0;
  background: rgba(75, 224, 200, 0.04); padding: 22px 24px; margin: 22px 0; max-width: 70ch;
}
.example-flow .tag { color: var(--text-faint); }
.example-flow ol { margin-top: 8px; }

/* breadcrumbs */
.crumbs { font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.12em; text-transform: uppercase; margin-bottom: 30px; }
.crumbs ol { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; }
.crumbs li + li::before { content: "/"; color: var(--text-faint); margin-right: 8px; }
.crumbs a { color: var(--text-faint); text-decoration: none; }
.crumbs a:hover { color: var(--cyan); }
.crumbs [aria-current] { color: var(--cyan); }

/* comparison tables */
.table-scroll { overflow-x: auto; margin: 24px 0; border: 1px solid var(--panel-edge); border-radius: 12px; }
table.compare { border-collapse: collapse; width: 100%; min-width: 640px; font-size: 0.9rem; }
table.compare caption {
  text-align: left; font-family: var(--mono); font-size: 0.62rem;
  letter-spacing: 0.16em; text-transform: uppercase; color: var(--text-faint); padding: 14px 16px 4px;
}
table.compare th, table.compare td {
  text-align: left; padding: 12px 16px; vertical-align: top;
  border-bottom: 1px solid rgba(94, 234, 212, 0.08); color: var(--text-dim);
}
table.compare thead th {
  font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--cyan); border-bottom: 1px solid rgba(94, 234, 212, 0.25);
}
table.compare tbody th { color: var(--text); font-weight: 500; font-family: var(--sans); }

/* FAQ */
details.faq-item {
  border: 1px solid var(--panel-edge); border-radius: 12px;
  background: var(--panel); margin-bottom: 12px;
}
details.faq-item[open] { border-color: rgba(94, 234, 212, 0.4); }
details.faq-item summary {
  cursor: pointer; list-style: none; padding: 18px 22px;
  display: flex; justify-content: space-between; align-items: center; gap: 20px;
  font-family: var(--serif); font-size: 1.15rem; color: var(--text);
}
details.faq-item summary::-webkit-details-marker { display: none; }
details.faq-item summary::after { content: "+"; font-family: var(--mono); color: var(--cyan); flex-shrink: 0; }
details.faq-item[open] summary::after { content: "×"; }
.faq-body { padding: 0 22px 20px; color: var(--text-dim); max-width: 64ch; font-size: 0.95rem; }

/* level rail navigation (adjacent levels) */
.adjacent {
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  margin-top: 46px; padding-top: 26px; border-top: 1px solid rgba(94, 234, 212, 0.12);
  font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.1em; text-transform: uppercase;
}
.adjacent a { text-decoration: none; color: var(--text-dim); }
.adjacent a:hover { color: var(--cyan); }

/* CTA band */
.cta-band {
  margin-top: 64px; padding: 40px 34px; text-align: center;
  border: 1px solid var(--panel-edge); border-radius: 16px;
  background: linear-gradient(170deg, rgba(75, 224, 200, 0.07), rgba(13, 24, 44, 0.5) 55%);
}
.cta-band h2 { margin: 0 auto 12px; }
.cta-band p { margin: 0 auto 22px; }
.cta-note { font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--text-faint); margin-top: 14px; }

/* dot motif for level pages */
.level-glyph { display: inline-block; margin-bottom: 18px; color: var(--cyan); }

/* footer */
.site-footer { border-top: 1px solid rgba(94, 234, 212, 0.1); padding: 46px 0 60px; }
.footer-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 38px; max-width: 1200px; margin: 0 auto; padding: 0 28px; }
.footer-grid h2 { font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.2em; text-transform: uppercase; color: var(--text-faint); margin: 0 0 14px; }
.footer-grid ul { list-style: none; }
.footer-grid li { padding: 4px 0; }
.footer-grid a { color: var(--text-dim); text-decoration: none; font-size: 0.9rem; }
.footer-grid a:hover { color: var(--cyan); }
.brand-tag {
  font-family: var(--mono); font-size: 0.6rem; letter-spacing: 0.3em;
  text-transform: uppercase; color: var(--text-faint);
  display: flex; align-items: center; gap: 10px; margin: 8px 0 14px;
}
.brand-tag::before, .brand-tag::after { content: ""; height: 1px; width: 22px; background: rgba(94, 234, 212, 0.35); }
.footer-story { color: var(--text-faint); font-size: 0.84rem; max-width: 40ch; }
.fine { font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-faint); text-align: center; margin-top: 40px; padding: 0 28px; }

@media (max-width: 860px) {
  .nav-links { display: none; }
  .menu-toggle { display: grid; place-items: center; }
  .footer-grid { grid-template-columns: 1fr; gap: 26px; }
  main { padding: 44px 0 70px; }
}
@media (min-width: 861px) { #mobile-menu { display: none !important; } }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}