/* ============================================================
   pleNx — promo site
   Aesthetic: "instruction manual" — Nintendo game-box flat
   design language, dark edition. Warm near-black ground, paper
   ink, ruled lines, condensed black uppercase display type,
   mono spec labels, hard flat color blocks. No glows, no
   gradients, no glass, no pills. The footer is a reversed
   paper block (the page's negative).
   Brand accents from the X logomark: amber / red / cyan.
   ============================================================ */

:root {
  --bg: #14110d;
  --surface: #1f1b15;
  --text: #f0ede3;
  --text-soft: #a59d8e;
  --amber: #e5a00d;
  --on-amber: #1c1812;
  --amber-deep: #9c6f06;
  --red: #ff4554;
  --cyan: #00b8d8;
  --rule: #e6e2d4;
  --rule-soft: rgba(240, 237, 227, 0.16);
  --font-display: "Archivo", sans-serif;
  --font-body: "Hanken Grotesk", sans-serif;
  --font-mono: "Fragment Mono", monospace;
  --wrap: 1200px;
  --gutter: clamp(1.2rem, 4vw, 2.5rem);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1.02rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--amber); color: var(--on-amber); }

a { color: var(--text); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1.5px; }
/* the box-shadow pads the highlight without shifting the text */
a:hover {
  background: var(--amber);
  color: var(--on-amber);
  text-decoration: none;
  box-shadow: 0 0 0 0.22em var(--amber);
}

img { max-width: 100%; height: auto; display: block; }

h1, h2, h3 {
  font-family: var(--font-display);
  font-stretch: 66%;
  font-weight: 860;
  text-transform: uppercase;
  line-height: 0.94;
  letter-spacing: 0;
}

code, kbd, .mono {
  font-family: var(--font-mono);
}

code {
  font-size: 0.84em;
  background: var(--surface);
  border: 1px solid var(--rule-soft);
  padding: 0.08em 0.4em;
}

kbd {
  font-size: 0.78em;
  border: 1.5px solid var(--text);
  padding: 0.08em 0.5em;
  background: var(--bg);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 3000;
  background: var(--text);
  color: var(--bg);
  padding: 0.6rem 1rem;
  font-family: var(--font-mono);
}
.skip-link:focus { left: 0; }

:focus-visible {
  outline: 2.5px solid var(--text);
  outline-offset: 2px;
}

/* ============ Nav ============ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  padding: 0.9rem var(--gutter);
  background: var(--bg);
  border-bottom: 1.5px solid var(--rule);
}

.nav-brand { border: none; text-decoration: none; }
.nav-brand:hover { background: none; box-shadow: none; }
.nav-brand img { height: 26px; width: auto; }

.nav-links {
  display: flex;
  gap: clamp(0.9rem, 2.5vw, 1.8rem);
  margin-left: auto;
  flex-wrap: wrap;
}
.nav-links a {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 0.2rem 0;
  border-bottom: 2px solid transparent;
}
.nav-links a:hover { background: none; box-shadow: none; color: var(--text); border-bottom-color: var(--amber); }
.nav-links a[aria-current="page"] { border-bottom-color: var(--text); }

.nav-gh { display: flex; padding: 0.2rem; text-decoration: none; }
.nav-gh:hover { background: var(--amber); }

/* On the homepage the hero owns the branding: the nav stays out of
   the way until the spec box has scrolled past (JS toggles .nav-shown).
   Scoped to .js — set pre-paint by the inline head script — so the nav
   is hidden from the very first frame, and stays sticky without JS. */
.js .nav-float {
  position: fixed;
  left: 0;
  right: 0;
  visibility: hidden;
  transform: translateY(-100%);
  transition: transform 0.25s ease-out, visibility 0s linear 0.25s;
}
.js .nav-float.nav-shown {
  visibility: visible;
  transform: none;
  transition: transform 0.25s ease-out;
}

/* ============ Hero ============ */
.hero {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(2.2rem, 5.5vh, 4rem) var(--gutter) 0;
}

/* Brand row: app icon (a homebrew-menu tile) at left, the wordmark
   with its dictionary entry centered, the spec box at right */
.hero-app-icon {
  width: clamp(92px, 11vw, 124px);
  height: auto;
  border-radius: 26%;
  border: 1.5px solid var(--rule-soft);
}

.hero-mark {
  align-self: center;
  justify-self: start;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.8rem;
}
.hero-mark img {
  width: clamp(190px, 24vw, 320px);
  height: auto;
}
.hero-mark-say {
  font-family: var(--font-mono);
  font-size: clamp(0.7rem, 1.1vw, 0.8rem);
  letter-spacing: 0.14em;
  line-height: 1;
  color: var(--text-soft);
  white-space: nowrap;
}

.hero-top {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 2.5rem;
  align-items: start;
  margin-bottom: clamp(2rem, 4.5vh, 3rem);
}

.hero h1 {
  font-size: clamp(3rem, 9.5vw, 7.2rem);
  margin-top: 6rem;
  text-align: center;
}
.nb { white-space: nowrap; }
.hero h1 .hl {
  background: var(--amber);
  color: var(--on-amber);
  padding: 0 0.08em;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
}

.hero h1 .h1-line { display: block; }

/* Regulatory side label, like the back of a game box */
.hero-spec {
  border: 1.5px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  min-width: 170px;
}
.hero-spec > div {
  padding: 0.55rem 0.8rem;
  border-bottom: 1px solid var(--rule-soft);
}
.hero-spec > div:last-child { border-bottom: none; }
.hero-spec .spec-strong {
  background: var(--text);
  color: var(--bg);
}
.hero-spec .spec-muted {
  font-size: 0.5rem;
  color: var(--text-soft);
}
.hero-spec a { text-decoration: none; color: inherit; display: block; margin: -0.55rem -0.8rem; padding: 0.55rem 0.8rem; }
.hero-spec a:hover { background: var(--amber); color: var(--on-amber); box-shadow: none; }

.hero-lead {
  margin-top: 2rem;
  margin-right: auto;
  margin-left: auto;
  max-width: 58ch;
  font-size: clamp(1.02rem, 1.5vw, 1.15rem);
  color: var(--text-soft);
  text-align: center;
}
.hero-lead strong { color: var(--text); }

.hero-cta {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
  margin-top: 1.8rem;
  justify-content: center;
}

/* ============ Buttons — flat, hard, print ============ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  border: 1.5px solid var(--text);
  padding: 0.85rem 1.5rem;
  transition: background 0.12s, color 0.12s;
}
.btn:hover { box-shadow: none; }
.btn-primary {
  background: var(--amber);
  border-color: var(--amber);
  color: var(--on-amber);
}
.btn-primary:hover {
  background: transparent;
  color: var(--amber);
}
.btn-ghost {
  background: transparent;
  color: var(--text);
}
.btn-ghost:hover {
  background: var(--text);
  color: var(--bg);
}

/* ============ Hero figure (the real console) ============ */
.hero-figure {
  margin: clamp(2.5rem, 6vh, 4.5rem) calc(var(--gutter) * -0) 0;
}
.hero-figure img {
  width: min(100%, 980px);
  margin: 0 auto;
}
.hero-figure figcaption {
  max-width: var(--wrap);
  margin: 1.4rem auto 0;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-soft);
  display: flex;
  align-items: center;
  gap: 0.7rem;
}
.fig-tag {
  background: var(--text);
  color: var(--bg);
  padding: 0.15rem 0.5rem;
  flex: none;
}

/* ============ Spec strip — game-box back panel ============ */
.spec-strip {
  margin-top: clamp(3rem, 7vh, 5rem);
  border-block: 1.5px solid var(--rule);
  display: flex;
  flex-wrap: wrap;
}
.spec-strip li {
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  padding: 0.8rem 1.3rem;
  border-right: 1px solid var(--rule-soft);
  flex: 1 1 auto;
  text-align: center;
  white-space: nowrap;
}
.spec-strip li:last-child { border-right: none; }
.spec-strip .spec-label {
  background: var(--text);
  color: var(--bg);
  flex: 0 0 auto;
  text-align: left;
}
.spec-strip .spec-k {
  color: var(--text-soft);
  margin-right: 0.55em;
}

/* ============ Sections ============ */
.section {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: clamp(4rem, 9vh, 6.5rem) var(--gutter) 0;
}

.sec-head {
  display: flex;
  align-items: flex-end;
  gap: 1.1rem;
  padding-bottom: 1.1rem;
  border-bottom: 1.5px solid var(--rule);
}
.sec-num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  background: var(--amber);
  color: var(--on-amber);
  padding: 0.35rem 0.6rem;
  flex: none;
}
.sec-head h2 {
  font-size: clamp(2.1rem, 5.5vw, 3.6rem);
}
.sec-note {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-soft);
  text-align: right;
  padding-bottom: 0.4rem;
  display: none;
}
@media (min-width: 760px) { .sec-note { display: block; } }

.section-sub {
  color: var(--text-soft);
  max-width: 60ch;
  margin-top: 1.1rem;
}
.section-sub a { color: var(--text); }

/* ============ Features — ruled grid, like a spec table ============ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--rule-soft);
  border-top: none;
  margin-top: 2.2rem;
}
.feature {
  padding: 1.5rem 1.4rem 1.7rem;
  border-right: 1px solid var(--rule-soft);
  border-top: 1px solid var(--rule-soft);
  transition: background 0.12s;
}
.feature:nth-child(4n) { border-right: none; }
.feature:hover { background: var(--surface); }

.feature-head {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  margin-bottom: 0.8rem;
}
.feature-head svg {
  width: 22px;
  height: 22px;
  flex: none;
}
.feature h3 {
  font-family: var(--font-body);
  font-stretch: 100%;
  font-weight: 800;
  text-transform: none;
  font-size: 1.05rem;
  line-height: 1.25;
  letter-spacing: -0.01em;
}
.feature p {
  font-size: 0.9rem;
  color: var(--text-soft);
}
.feature p kbd { color: var(--text); }

.codec-list {
  margin-top: 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text);
  border-top: 1px solid var(--rule-soft);
  padding-top: 0.7rem;
}

/* ============ Screens rail — numbered figures ============ */
.section-screens { max-width: none; padding-inline: 0; }
.section-screens > .sec-wrap {
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.screens-rail {
  display: flex;
  gap: 1.6rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding: 2.2rem max(1.5rem, calc((100vw - var(--wrap)) / 2 + var(--gutter) - 1.5rem)) 1.4rem;
  scrollbar-width: thin;
  scrollbar-color: var(--text) transparent;
}

.screens-rail figure {
  flex: 0 0 min(76vw, 580px);
  scroll-snap-align: center;
}

.shot {
  display: block;
  width: 100%;
  border: 1.5px solid var(--text);
  padding: 0;
  background: var(--bg);
  cursor: zoom-in;
  transition: outline-color 0.12s;
  outline: 3px solid transparent;
}
.shot:hover { outline-color: var(--amber); }
.shot img { width: 100%; }

.screens-rail figcaption {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-soft);
  margin-top: 0.8rem;
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

.rail-hint {
  max-width: var(--wrap);
  margin: 0.4rem auto 0;
  padding-inline: var(--gutter);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-soft);
}

/* ============ Install — numbered manual steps ============ */
.steps {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: 1px solid var(--rule-soft);
  border-top: none;
  margin-top: 2.2rem;
}
.step {
  padding: 1.6rem 1.5rem 1.8rem;
  border-right: 1px solid var(--rule-soft);
  border-top: 1px solid var(--rule-soft);
}
.step:last-child { border-right: none; }

.step-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 1rem;
  background: var(--amber);
  color: var(--on-amber);
  padding: 0.3rem 0.65rem;
  margin-bottom: 1rem;
}
.step h3 {
  font-family: var(--font-body);
  font-stretch: 100%;
  font-weight: 800;
  text-transform: none;
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}
.step p { color: var(--text-soft); font-size: 0.92rem; }

.install-cta {
  display: flex;
  gap: 0.8rem;
  flex-wrap: wrap;
  align-items: center;
  margin-top: 2rem;
}

/* ============ Console bar (in-app footer tribute) ============ */
.console-bar {
  margin-top: clamp(4rem, 9vh, 6.5rem);
  background: var(--surface);
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 0.85rem var(--gutter);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  border-top: 1px solid var(--rule-soft);
}

.cb-left { display: flex; align-items: center; gap: 0.85rem; }
.cb-left time { letter-spacing: 0.08em; }

.cb-right { display: flex; align-items: center; gap: 1.6rem; }

.cb-hint {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: var(--text);
  text-decoration: none;
}
.cb-hint:hover { background: none; box-shadow: none; color: var(--amber); }

.btn-glyph {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.55em;
  height: 1.55em;
  border-radius: 50%;
  border: 1.5px solid currentColor;
  font-size: 0.78em;
  font-style: normal;
}
.btn-glyph-a {
  background: var(--amber);
  border-color: var(--amber);
  color: var(--on-amber);
}

/* ============ Footer — reversed paper block (the page's negative) ============ */
.footer {
  background: var(--text);
  color: var(--bg);
  padding: 3.2rem var(--gutter) 1.8rem;
}

.footer a { color: var(--bg); }
.footer a:hover { background: var(--amber); color: var(--on-amber); }

.footer-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr;
  gap: 2.5rem;
}

.footer-brand img { width: 165px; margin-bottom: 1.1rem; }
.footer-brand p { color: rgba(20, 17, 13, 0.7); font-size: 0.9rem; }
.footer-brand a { color: var(--bg); }

.footer-col { display: flex; flex-direction: column; gap: 0.5rem; align-items: flex-start; }
.footer-col h3 {
  font-family: var(--font-mono);
  font-stretch: 100%;
  font-size: 0.68rem;
  font-weight: 400;
  letter-spacing: 0.18em;
  color: var(--amber-deep);
  margin-bottom: 0.5rem;
}
.footer-col a {
  font-size: 0.92rem;
  color: rgba(20, 17, 13, 0.75);
  text-decoration: none;
}
.footer-col a:hover { background: var(--amber); color: var(--on-amber); }

.footer-legal {
  max-width: var(--wrap);
  margin: 2.8rem auto 0;
  padding-top: 1.4rem;
  border-top: 1px solid rgba(20, 17, 13, 0.3);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.06em;
  color: rgba(20, 17, 13, 0.65);
}
.footer-legal a { color: rgba(20, 17, 13, 0.65); text-decoration: underline; }
.footer-legal a:hover { background: var(--amber); color: var(--on-amber); }

/* ============ Lightbox ============ */
.lightbox {
  /* the global margin reset kills the UA's `margin: auto` that
     centers a modal dialog — restore it */
  margin: auto;
  border: none;
  background: transparent;
  padding: 0;
  max-width: 92vw;
  max-height: 88vh;
  overflow: visible;
}
.lightbox::backdrop {
  background: rgba(24, 21, 17, 0.92);
}
.lightbox img {
  max-width: 92vw;
  max-height: 84vh;
  width: auto;
  height: auto;
  border: 1.5px solid var(--text);
}
.lightbox-close {
  position: absolute;
  top: -2.6rem;
  right: 0;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: none;
  border: none;
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  cursor: pointer;
}

/* ============ Player's Guide ============ */
.guide {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.guide-hero {
  padding: clamp(3rem, 7vh, 5rem) 0 0;
}
.guide-hero h1 {
  font-size: clamp(2.6rem, 7vw, 5rem);
}
.guide-kicker {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-soft);
  margin-bottom: 1rem;
}

.toc {
  display: flex;
  flex-direction: column;
  border: 1.5px solid var(--rule);
  margin-top: 2.2rem;
}
.toc a {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--rule-soft);
}
.toc a:last-child { border-bottom: none; }
.toc a:hover { background: var(--amber); color: var(--on-amber); box-shadow: none; }
.toc-num {
  font-family: var(--font-mono);
  background: var(--text);
  color: var(--bg);
  padding: 0.1rem 0.45rem;
  font-size: 0.72rem;
  flex: none;
}

.guide-section {
  padding-top: clamp(3rem, 7vh, 4.5rem);
  scroll-margin-top: 4.5rem;
}
.guide-section .sec-head { margin-bottom: 1.4rem; }
.guide-section .sec-head h2 { font-size: clamp(1.8rem, 4vw, 2.6rem); }

.guide-body { color: var(--text-soft); }
.guide-body > * + * { margin-top: 1rem; }
.guide-body strong { color: var(--text); }
.guide-body ol, .guide-body ul { padding-left: 1.5rem; }
.guide-body li { margin-top: 0.5rem; }
.guide-body li::marker {
  color: var(--text);
  font-family: var(--font-mono);
  font-weight: 700;
}

.guide-body pre {
  background: var(--text);
  color: var(--bg);
  padding: 0.9rem 1.1rem;
  overflow-x: auto;
  margin-top: 0.8rem;
}
.guide-body pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 0.84rem;
  color: inherit;
}

.note {
  background: var(--amber);
  padding: 1rem 1.2rem;
  font-size: 0.95rem;
  color: var(--on-amber);
}
.note strong { color: var(--on-amber); }

.platform-list div {
  border-top: 1px solid var(--rule-soft);
  padding: 1rem 0;
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 1rem;
}
.platform-list div:last-child { border-bottom: 1px solid var(--rule-soft); }
.platform-list dt {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text);
  padding-top: 0.15rem;
}
.platform-list dd pre { margin-top: 0.6rem; }

.controls {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  border: 1px solid var(--rule-soft);
}
.controls th {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 400;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  background: var(--text);
  color: var(--bg);
  text-align: left;
  padding: 0.6rem 0.9rem;
}
.controls td {
  padding: 0.6rem 0.9rem;
  border-bottom: 1px solid var(--rule-soft);
  border-right: 1px solid var(--rule-soft);
}
.controls td:last-child { color: var(--text); border-right: none; }
.controls .btn-glyph { font-size: 0.7rem; color: var(--text); }

.guide-body details {
  border: 1px solid var(--rule-soft);
  border-bottom: none;
}
.guide-body details:last-child { border-bottom: 1px solid var(--rule-soft); }
.guide-body summary {
  cursor: pointer;
  list-style: none;
  font-weight: 700;
  color: var(--text);
  padding: 0.9rem 1.2rem;
  position: relative;
}
.guide-body summary::-webkit-details-marker { display: none; }
.guide-body summary::after {
  content: "+";
  position: absolute;
  right: 1.1rem;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
}
.guide-body details[open] summary::after { content: "−"; }
.guide-body summary:hover { background: var(--surface); }
.guide-body details > *:not(summary) { margin: 0 1.2rem 1rem; }
.guide-body details p + pre { margin-top: 0.6rem; }
.guide-body details + details { margin-top: 0; }

/* ============ 404 — error report page ============ */
.page-404 {
  display: flex;
  flex-direction: column;
  min-height: 100svh;
}
.page-404 main {
  flex: 1;
  width: 100%;
}

.err-panel {
  border: 1.5px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  max-width: 620px;
  margin-top: 0.6rem;
}
.err-panel > div {
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--rule-soft);
}
.err-panel > div:last-child { border-bottom: none; }
.err-panel .err-strong {
  background: var(--text);
  color: var(--bg);
}
.err-panel .err-soft { color: var(--text-soft); }

/* ============ Reveals (scoped to JS being available) ============ */
.js .reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s ease-out, transform 0.5s ease-out;
  transition-delay: calc(var(--i, 0) * 70ms);
}
.js .reveal.in { opacity: 1; transform: none; }

/* ============ Responsive ============ */
@media (max-width: 980px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .feature:nth-child(4n) { border-right: 1px solid var(--rule-soft); }
  .feature:nth-child(2n) { border-right: none; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: span 2; }
  .hero-top { grid-template-columns: 1fr; }
  .hero-mark { justify-self: start; align-items: flex-start; }
  .hero-mark img { width: clamp(190px, 40vw, 280px); }
  .hero-spec { max-width: 280px; }
}

@media (max-width: 640px) {
  .nav-gh { order: 2; margin-left: auto; }
  .nav-links { order: 3; flex-basis: 100%; margin-left: 0; }
  .feature-grid, .steps { grid-template-columns: 1fr; }
  .feature, .feature:nth-child(4n), .feature:nth-child(2n), .step { border-right: none; }
  .footer-inner { grid-template-columns: 1fr; }
  .footer-brand { grid-column: span 1; }
  .spec-strip .spec-label { flex-basis: 100%; }
  .cb-right { gap: 1rem; }
  .console-bar { font-size: 0.72rem; }
  .platform-list div { grid-template-columns: 1fr; gap: 0.3rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .reveal { opacity: 1; transform: none; transition: none; }
  .btn, .feature, .nav-links a, .nav-gh, .shot, .toc a, .cb-hint,
  .guide-body summary, .js .nav-float, .js .nav-float.nav-shown { transition: none; }
}