/* ---- Tokens & Reset ---- */
:root {
  --serif: "Fraunces", Georgia, serif;
  --sans: "Inter", ui-sans-serif, system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --accent: #ff6a4d;
  --max-w: 1240px;
  /* Unified deep base for the cinematic dark theme; each chapter supplies only its
     accent (below), which colours the background glow. */
  --chapter-base: #0b0a08;
  --chapter-mid: #1a140f;
  --chapter-accent: #ff5a44;
  --nav-h: 72px;
}

body[data-ink="dark"] {
  --fg: #1a1714;
  --fg-soft: rgba(26, 23, 20, .78);
  --muted: rgba(26, 23, 20, .58);
  --line: rgba(26, 23, 20, .16);
  --line-soft: rgba(26, 23, 20, .08);
  --accent: #c83b2c;
  --accent-ink: #fff;
  --chip-bg: rgba(255, 255, 255, .34);
  --win-bg: rgba(252, 250, 246, .86);
  --win-line: rgba(26, 23, 20, .14);
}

body[data-ink="light"] {
  --fg: #f6f1e9;
  --fg-soft: rgba(246, 241, 233, .82);
  --muted: rgba(246, 241, 233, .58);
  --line: rgba(246, 241, 233, .2);
  --line-soft: rgba(246, 241, 233, .1);
  --accent: #ff6a4d;
  --accent-ink: #1a0d08;
  --chip-bg: rgba(0, 0, 0, .22);
  --win-bg: rgba(12, 10, 8, .6);
  --win-line: rgba(246, 241, 233, .16);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-h);
  /* clip (not hidden): kills horizontal overflow from the oversized ghost numerals
     without creating a new scroll container. */
  overflow-x: clip;
  /* Deep ground behind the fixed .bg-cinematic layer (z-index: -1). The body MUST
     stay transparent: an opaque body background would paint over the negative-z
     background layer. */
  background: #0b0a08;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  min-width: 320px;
  overflow-x: hidden;
  background-color: transparent;
  color: var(--fg);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  transition: color .8s ease;
}

/* Without WebGL the gradient fallback (body.no-webgl::before) carries the chapter
   color; with JS off entirely, the body grounds itself on the chapter base. */
html:not(.js) body,
body.no-webgl {
  background-color: var(--chapter-base);
  transition: background-color 1.1s ease, color .8s ease;
}

body,
.btn,
.chip,
.win,
a,
.eyebrow,
.mark,
.mark-glyph,
.chapter-hud,
.prose,
.section-intro,
.tool-blurb,
.faq-item,
summary,
.win-bar,
.code,
.site-nav {
  transition:
    color .8s ease,
    background-color .8s ease,
    border-color .8s ease,
    box-shadow .8s ease;
}

::selection {
  background: var(--accent);
  color: var(--accent-ink);
}

a {
  color: inherit;
  text-decoration: none;
}

button,
summary {
  font: inherit;
}

img,
svg {
  display: block;
  max-width: 100%;
}

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

/* ---- Chapter Accents ----
   One deep base for the whole document (set in :root); each chapter supplies only
   its signature accent, which tints the base and colours the spotlight glow. This
   is what gives every chapter its identity in the cinematic dark theme. */
body[data-chapter="prologue"]            { --chapter-accent: #ff5a44; }
body[data-chapter="manifesto"]           { --chapter-accent: #ff6a4d; }
body[data-chapter="workflow"]            { --chapter-accent: #ff6a4d; }
body[data-chapter="tools"]               { --chapter-accent: #ff6147; }
body[data-chapter="tool-railwyrm"]       { --chapter-accent: #ff7a3c; }
body[data-chapter="tool-rails-audit"]    { --chapter-accent: #f0bd55; }
body[data-chapter="tool-boorails"]       { --chapter-accent: #46cda3; }
body[data-chapter="tool-prompt-refiner"] { --chapter-accent: #9a9cff; }
body[data-chapter="tool-roundhouse"]     { --chapter-accent: #ff5a68; }
body[data-chapter="tool-dev-loop"]       { --chapter-accent: #ffa64d; }
body[data-chapter="terminal"]            { --chapter-accent: #ff6a4d; }
body[data-chapter="about"]               { --chapter-accent: #ff5a44; }
body[data-chapter="install"]             { --chapter-accent: #ff6a4d; }
body[data-chapter="faq"]                 { --chapter-accent: #ff6147; }
body[data-chapter="epilogue"]            { --chapter-accent: #ff5a44; }

/* ---- Cinematic Background ---- */
/* A deep, near-black surface tinted by the chapter accent, with a single soft
   spotlight glow behind the hero, fine film grain, and a vignette — focused and
   material, in the spirit of luxury-tech dark mode. Layers recolour smoothly per
   chapter via currentColor transitions. Pure CSS; renders with JS disabled. */
.bg-cinematic {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  background-color: #0b0a08;
}

/* Whole-field accent wash so the near-black carries the chapter's colour. */
.bp-tint {
  position: absolute;
  inset: 0;
  color: var(--chapter-accent);
  background: currentColor;
  opacity: .055;
  transition: color 1.1s ease;
}

/* The spotlight: a soft glow descending from above, behind the hero, plus a
   quieter off-axis bloom for asymmetry. Recolours per chapter. */
.bp-glow {
  position: absolute;
  inset: 0;
  color: var(--chapter-accent);
  background:
    radial-gradient(78% 58% at 50% -6%, currentColor 0%, transparent 60%),
    radial-gradient(64% 46% at 80% 14%, currentColor 0%, transparent 55%);
  opacity: .17;
  transition: color 1.1s ease;
}

/* Fine film grain for material, cinematic depth. */
.bp-grain {
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 180px 180px;
  opacity: .07;
  mix-blend-mode: overlay;
  pointer-events: none;
}

/* Cinematic vignette to frame and ground the field. */
.bp-vignette {
  position: absolute;
  inset: 0;
  background: radial-gradient(135% 115% at 50% 42%, transparent 50%, rgba(0, 0, 0, .55) 100%);
  pointer-events: none;
}

@media (prefers-reduced-motion: reduce) {
  .bp-tint,
  .bp-glow { transition: none; }
}

/* ---- Layout ---- */
.chapter {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 100svh;
  padding: clamp(96px, 14vh, 160px) 0;
}

.chapter > .container,
.chapter > .container-md,
.chapter > .container-sm,
.terminal-stage,
.footer-grid,
.legal-row {
  position: relative;
  z-index: 1;
}

.container,
.container-md,
.container-sm {
  width: 100%;
  margin: 0 auto;
  padding: 0 28px;
}

.container {
  max-width: var(--max-w);
}

.container-md {
  max-width: 1080px;
}

.container-sm {
  max-width: 880px;
}

#epilogue {
  display: block;
  min-height: auto;
  padding: clamp(56px, 8vh, 96px) 0 40px;
}

/* ---- Typography ---- */
.h-display,
.h-section,
.tool-name {
  margin: 0;
  color: var(--fg);
  font-family: var(--serif);
  font-weight: 400;
  text-wrap: balance;
}

.h-display {
  max-width: 11ch;
  font-size: clamp(54px, 8.5vw, 124px);
  line-height: .94;
  letter-spacing: -.03em;
}

.h-section {
  max-width: 13ch;
  font-size: clamp(36px, 4.8vw, 68px);
  line-height: 1.02;
  letter-spacing: -.02em;
}

.tool-name {
  font-size: clamp(48px, 7vw, 104px);
  line-height: .95;
  letter-spacing: -.025em;
}

.h-display em,
.h-section em,
.tool-name em,
.is-em .wi {
  color: var(--accent);
  font-style: italic;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 22px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .16em;
  line-height: 1.5;
  text-transform: uppercase;
}

.tool-tag {
  margin-bottom: 0;
}

.accent-dot {
  color: var(--accent);
  letter-spacing: 0;
}

.eyebrow-rail {
  display: inline-block;
  flex: 1 1 80px;
  height: 1px;
  min-width: 64px;
  background: var(--line);
  transform-origin: left;
}

.lede {
  max-width: 36ch;
  margin: 28px 0 0;
  color: var(--fg-soft);
  font-size: clamp(18px, 2vw, 22px);
  line-height: 1.45;
}

.prose {
  max-width: 62ch;
  margin: 24px 0 0;
  color: var(--fg-soft);
  font-size: clamp(17px, 1.6vw, 19px);
  line-height: 1.68;
}

.prose-coda {
  color: var(--fg);
  font-family: var(--serif);
  font-size: clamp(22px, 2.6vw, 32px);
  font-style: italic;
  line-height: 1.28;
}

.dropcap::first-letter {
  float: left;
  padding: .04em .12em 0 0;
  color: var(--accent);
  font-family: var(--serif);
  font-size: 5.2em;
  font-weight: 600;
  line-height: .82;
}

.section-intro {
  max-width: 58ch;
  margin: 26px 0 0;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.55;
}

.signature {
  margin: 30px 0 0;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.w {
  display: inline-block;
  overflow: hidden;
  margin-bottom: -.08em;
  padding-bottom: .08em;
  vertical-align: top;
}

.wi {
  display: inline-block;
  will-change: transform;
}

html.js [data-reveal] {
  opacity: 0;
}

/* ---- Navigation ---- */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 100;
  width: 100%;
  color: var(--fg);
}

body[data-ink="light"] .site-nav,
body[data-ink="light"] .chapter-hud {
  text-shadow: 0 1px 18px rgba(0, 0, 0, .34);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px 28px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 13px;
}

.nav-links a,
.nav-github {
  border-radius: 999px;
}

.nav-links a:hover,
.nav-github:hover {
  color: var(--fg);
}

.nav-github {
  color: var(--muted);
  font-size: 12px;
  letter-spacing: .04em;
}

.nav-progress {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
}

.mark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--fg);
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .04em;
}

.mark-glyph {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border: 1.5px solid var(--accent);
  border-radius: 6px;
  background: color-mix(in oklab, var(--accent) 10%, transparent);
  color: var(--accent);
  font-family: var(--serif);
  font-size: 14px;
  font-weight: 600;
  line-height: 1;
}

.mark-glyph::before {
  content: "";
  position: absolute;
  top: 50%;
  right: 4px;
  left: 4px;
  height: 1.5px;
  background: var(--accent);
  opacity: .35;
  transform: translateY(-50%);
}

.mark-glyph span {
  position: relative;
  z-index: 1;
  padding: 0 1px;
  background: var(--chapter-base);
  transition: background-color 1.1s ease;
}

.chapter-hud {
  position: fixed;
  bottom: 24px;
  left: 28px;
  z-index: 90;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.hud-numeral {
  color: var(--accent);
  font-family: var(--serif);
  font-size: 18px;
  letter-spacing: 0;
  text-transform: none;
}

.hud-rule {
  width: 28px;
  height: 1px;
  background: var(--line);
}

/* ---- Controls & Surfaces ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 46px;
  padding: 13px 20px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--fg);
  cursor: pointer;
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 600;
  line-height: 1;
  white-space: nowrap;
  transition:
    color .8s ease,
    background-color .8s ease,
    border-color .8s ease,
    transform .18s ease,
    filter .18s ease;
}

.btn:hover {
  border-color: var(--fg);
  transform: translateY(-1px);
}

.btn-primary {
  border-color: transparent;
  background: var(--accent);
  color: var(--accent-ink);
}

.btn-primary:hover {
  filter: brightness(1.05);
}

.btn-ghost {
  background: transparent;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 28px;
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--chip-bg);
  color: var(--fg-soft);
  font-family: var(--mono);
  font-size: 11px;
  line-height: 1.2;
  white-space: nowrap;
}

.chip .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  flex: 0 0 auto;
}

.win {
  overflow: hidden;
  border: 1px solid var(--win-line);
  border-radius: 14px;
  background: var(--win-bg);
  box-shadow: 0 1px 0 rgba(255, 255, 255, .06) inset, 0 24px 60px -30px rgba(0, 0, 0, .5);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.win-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  min-height: 40px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--win-line);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11.5px;
}

.win-dots {
  display: flex;
  gap: 6px;
  flex: 0 0 auto;
}

.win-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.win-dot.r {
  background: #ff5f57;
}

.win-dot.y {
  background: #febc2e;
}

.win-dot.g {
  background: #28c840;
}

.win-title {
  flex: 1 1 auto;
  overflow: hidden;
  text-align: center;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.win-actions {
  flex: 0 1 auto;
  overflow: hidden;
  opacity: .66;
  text-align: right;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.win-body {
  overflow-x: auto;
}

.win-body::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

.win-body::-webkit-scrollbar-thumb {
  border-radius: 999px;
  background: var(--line);
}

pre.code {
  margin: 0;
  padding: 22px 24px;
  color: var(--fg-soft);
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1.75;
}

.t-line {
  display: block;
  min-height: 1.75em;
  white-space: pre;
}

.t-blank {
  color: transparent;
}

.kw,
.cursor {
  color: var(--accent);
}

.com {
  color: var(--muted);
  font-style: italic;
}

@keyframes blink {
  0%,
  49% {
    opacity: 1;
  }

  50%,
  100% {
    opacity: 0;
  }
}

.blink {
  animation: blink 1.1s steps(1) infinite;
}

/* ---- Hero & Scroll Cue ---- */
#prologue .container {
  padding-bottom: 52px;
}

#prologue .h-display + [data-reveal],
#prologue .lede + [data-reveal] {
  margin-top: 32px;
}

#prologue .lede + [data-reveal],
#about .prose + [data-reveal],
#install .win + [data-reveal] {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.scroll-cue {
  position: absolute;
  bottom: 28px;
  left: 50%;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: 10px;
  letter-spacing: .2em;
  transform: translateX(-50%);
}

.cue-line {
  width: 1px;
  height: 44px;
  background: var(--line);
}

/* ---- Pipeline ---- */
.pipeline {
  position: relative;
  margin-top: 56px;
}

.pipeline-rail {
  position: absolute;
  top: 0;
  right: 0;
  left: 0;
  height: 2px;
  background: var(--accent);
  transform-origin: left;
}

.stations {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 28px;
  margin: 0;
  padding: 40px 0 0;
  list-style: none;
}

.station {
  position: relative;
  min-width: 0;
  padding-top: 18px;
  border-top: 1px solid var(--line);
}

.station-num {
  display: block;
  margin-bottom: 12px;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.station-name {
  margin: 0;
  color: var(--fg);
  font-family: var(--serif);
  font-size: clamp(22px, 2.4vw, 28px);
  font-weight: 500;
  line-height: 1.1;
}

.station-desc {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
}

.station-arrow {
  position: absolute;
  top: 14px;
  right: -20px;
  color: var(--accent);
  font-family: var(--serif);
  font-size: 24px;
  line-height: 1;
}

/* ---- Tool Scenes ---- */
.tool-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  align-items: center;
  gap: clamp(32px, 6vw, 80px);
}

.tool-copy {
  display: flex;
  grid-column: 1;
  flex-direction: column;
  gap: 22px;
  max-width: 640px;
}

.tool-scene--alt .tool-copy {
  grid-column: 2;
  justify-self: end;
}

.paint-stroke {
  width: min(280px, 40vw);
  height: 10px;
  border-radius: 999px 2px 999px 2px;
  background: linear-gradient(90deg, var(--accent), color-mix(in srgb, var(--accent) 40%, transparent));
  filter: blur(.2px);
  opacity: .85;
  transform-origin: left;
}

.tool-blurb {
  max-width: 52ch;
  margin: 0;
  color: var(--fg-soft);
  font-size: clamp(17px, 1.7vw, 20px);
  line-height: 1.6;
}

.tool-meta,
.tool-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.tool-actions {
  gap: 10px;
}

/* ---- Terminal ---- */
#terminal {
  display: block;
  padding: 0;
}

.terminal-stage {
  display: flex;
  align-items: center;
  min-height: 100svh;
  padding: 96px 0;
}

#terminal .win,
#install .win {
  margin-top: 34px;
}

#install .win {
  max-width: 100%;
}

/* ---- FAQ ---- */
.faq-item {
  border-top: 1px solid var(--line);
}

.faq-item:last-of-type {
  border-bottom: 1px solid var(--line);
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding: 24px 0;
  color: var(--fg);
  cursor: pointer;
  list-style: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.q {
  font-family: var(--serif);
  font-size: clamp(20px, 2.2vw, 24px);
  line-height: 1.22;
}

.plus {
  flex: 0 0 auto;
  color: var(--accent);
  font-family: var(--serif);
  font-size: 28px;
  line-height: 1;
}

.plus::before {
  content: "+";
}

details[open] .plus::before {
  content: "−";
}

.a {
  max-width: 64ch;
  padding: 4px 0 22px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.65;
}

.a p {
  margin: 0;
}

@supports (interpolate-size: allow-keywords) {
  :root {
    interpolate-size: allow-keywords;
  }

  .faq-item::details-content {
    block-size: 0;
    opacity: 0;
    overflow: hidden;
    transition: block-size .32s ease, opacity .32s ease;
  }

  .faq-item[open]::details-content {
    block-size: auto;
    opacity: 1;
  }
}

/* ---- Footer ---- */
.track-line {
  height: 28px;
  margin: 0 28px 56px;
  opacity: .86;
  background:
    repeating-linear-gradient(90deg, transparent 0 22px, var(--accent) 22px 30px, transparent 30px 52px),
    linear-gradient(var(--accent), var(--accent));
  background-position: center, center;
  background-repeat: repeat-x, no-repeat;
  background-size: auto 22px, 100% 2px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 28px;
}

.footer-grid h3,
.footer-grid h4 {
  margin: 0 0 14px;
  color: var(--fg);
}

.footer-grid h4 {
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .16em;
  text-transform: uppercase;
}

.footer-grid p {
  max-width: 30ch;
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.65;
}

.footer-grid ul {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-grid a {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 13px;
}

.footer-grid a:hover {
  color: var(--fg);
}

.legal-row {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  width: calc(100% - 56px);
  max-width: calc(var(--max-w) - 56px);
  margin: 56px auto 0;
  padding-top: 24px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
  line-height: 1.5;
}

/* ---- A11y ---- */
.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 200;
  padding: 10px 14px;
  border-radius: 999px;
  background: var(--accent);
  color: var(--accent-ink);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  opacity: 0;
  transform: translateY(-150%);
}

.skip-link:focus {
  opacity: 1;
  transform: translateY(0);
}

:where(a, button, summary, .btn):focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

.mark:focus-visible,
.nav-links a:focus-visible,
.nav-github:focus-visible {
  border-radius: 999px;
}

/* ---- Lenis ---- */
html.lenis {
  height: auto;
}

.lenis.lenis-smooth {
  scroll-behavior: auto !important;
}

.lenis.lenis-smooth [data-lenis-prevent] {
  overscroll-behavior: contain;
}

.lenis.lenis-stopped {
  overflow: hidden;
}

.lenis.lenis-scrolling iframe {
  pointer-events: none;
}

/* ---- Responsive ---- */
@media (max-width: 900px) {
  .stations,
  .tool-grid {
    grid-template-columns: 1fr;
  }

  .pipeline-rail,
  .station-arrow {
    display: none;
  }

  .stations {
    gap: 22px;
    padding-top: 0;
  }

  .station {
    padding: 0 0 0 18px;
    border-top: 0;
    border-left: 2px solid var(--accent);
  }

  .tool-scene--alt .tool-copy,
  .tool-copy {
    grid-column: 1;
    justify-self: start;
  }

  .tool-grid {
    align-content: center;
  }
}

@media (max-width: 760px) {
  .container,
  .container-md,
  .container-sm,
  .footer-grid {
    padding-right: 20px;
    padding-left: 20px;
  }

  .nav-inner {
    padding: 16px 20px;
  }

  .nav-links,
  .chapter-hud {
    display: none;
  }

  .nav-inner {
    justify-content: space-between;
  }

  .nav-github {
    max-width: 42vw;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .chapter {
    padding: 92px 0;
  }

  .h-section {
    max-width: 11ch;
  }

  .eyebrow {
    align-items: flex-start;
    letter-spacing: .12em;
  }

  .eyebrow-rail {
    min-width: 40px;
  }

  .terminal-stage {
    padding: 88px 0;
  }

  pre.code {
    padding: 18px 18px;
    font-size: 12px;
    line-height: 1.72;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .track-line {
    margin-right: 20px;
    margin-left: 20px;
  }

  .legal-row {
    flex-direction: column;
    width: calc(100% - 40px);
    max-width: none;
  }
}

@media (max-width: 480px) {
  .container,
  .container-md,
  .container-sm,
  .footer-grid {
    padding-right: 18px;
    padding-left: 18px;
  }

  .nav-inner {
    padding-right: 18px;
    padding-left: 18px;
  }

  .mark-word {
    display: none;
  }

  .h-display {
    font-size: clamp(42px, 11vw, 64px);
    line-height: .98;
    letter-spacing: -.02em;
  }

  .h-section {
    font-size: clamp(34px, 10vw, 48px);
  }

  .tool-name {
    font-size: clamp(44px, 13vw, 68px);
  }

  .lede,
  .tool-blurb {
    max-width: none;
  }

  .btn {
    width: 100%;
  }

  .tool-actions,
  #prologue .lede + [data-reveal],
  #about [data-reveal]:has(.btn),
  #install [data-reveal]:has(.btn) {
    width: 100%;
  }

  .chip {
    max-width: 100%;
    white-space: normal;
  }

  .win-bar {
    gap: 8px;
  }

  .win-actions {
    display: none;
  }

  .scroll-cue {
    bottom: 18px;
  }

  .track-line {
    margin-right: 18px;
    margin-left: 18px;
  }

  .legal-row {
    width: calc(100% - 36px);
  }
}

/* ---- Reduced Motion ---- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: .001ms;
    animation-iteration-count: 1;
    scroll-behavior: auto;
  }

  html.js [data-reveal] {
    opacity: 1;
  }

  .wi {
    transform: none;
  }

  .blink {
    animation: none;
  }

  .btn:hover {
    transform: none;
  }
}