* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 1.05rem/1.55 var(--sans);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 0.18em; }
a:hover { filter: brightness(0.92); }

.rail {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem clamp(1rem, 3vw, 1.75rem);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  border-bottom: 1px solid transparent;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: border-color 0.2s ease;
}
.rail.scrolled { border-bottom-color: var(--line); }
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--ink);
}
.brand img { width: 1.55rem; height: 1.55rem; border-radius: 0.35rem; display: block; }
.brand .wm { font-weight: 700; letter-spacing: -0.03em; font-size: 1rem; }
.rail-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.85rem;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.rail-links a { color: var(--ink-soft); text-decoration: none; }
.rail-links a:hover, .rail-links a.on { color: var(--accent); }
.stamp {
  font: 700 0.62rem/1 var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 0.28rem 0.5rem;
  border: 1px solid var(--ship-blocked);
  color: var(--ship-blocked);
  border-radius: var(--radius);
}

.dots {
  position: fixed;
  right: 1.1rem;
  top: 50%;
  transform: translateY(-50%);
  z-index: 25;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}
.dots a {
  width: 0.45rem;
  height: 0.45rem;
  border-radius: 999px;
  background: var(--line);
  text-decoration: none;
  transition: background 0.15s ease, transform 0.15s ease;
}
.dots a.on { background: var(--accent); transform: scale(1.35); }
@media (max-width: 720px) {
  .dots, .rail-links { display: none; }
}

.chapter {
  min-height: 100svh;
  display: grid;
  align-content: center;
  padding: 6.5rem clamp(1.1rem, 4vw, 2.5rem) 4.5rem;
  position: relative;
  border-bottom: 1px solid var(--line);
}
.chapter .inner { width: min(920px, 100%); margin: 0 auto; }
.chapter.wide .inner { width: min(1080px, 100%); }
.chapter > .inner { position: relative; z-index: 1; }

.kicker {
  margin: 0 0 0.75rem;
  font: 700 0.7rem/1 var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
}
.chapter h1, .chapter h2 {
  margin: 0 0 1rem;
  font: 700 clamp(2.4rem, 7vw, 4.6rem)/1.02 var(--sans);
  letter-spacing: -0.045em;
  color: var(--ink);
  max-width: 22ch;
}
.chapter h1 .stop, .chapter h2 .stop { color: var(--accent); }
.chapter .lede {
  margin: 0;
  max-width: 36rem;
  font-size: clamp(1.1rem, 2.4vw, 1.4rem);
  line-height: 1.45;
  color: var(--ink-mid);
  font-weight: 500;
}
.chapter .body {
  margin: 1.15rem 0 0;
  max-width: 38rem;
  font-size: 1.05rem;
  line-height: 1.55;
  color: var(--ink-mid);
}
.chapter .body p { margin: 0 0 0.95rem; }
.chapter .body p:last-child { margin-bottom: 0; }
.chapter code, .lede code {
  font-family: var(--mono);
  font-size: 0.86em;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.05em 0.35em;
}

.glow {
  position: absolute;
  inset: 10% auto auto -12%;
  width: min(36rem, 80vw);
  height: min(36rem, 80vw);
  border-radius: 50%;
  background: radial-gradient(circle, color-mix(in srgb, var(--accent) 18%, transparent), transparent 70%);
  pointer-events: none;
  z-index: 0;
}
.glow.ok {
  background: radial-gradient(circle, color-mix(in srgb, var(--ship-ok) 22%, transparent), transparent 70%);
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 1.5rem;
  align-items: center;
}
.btn, button.act, .tenants button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1rem;
  border-radius: var(--radius);
  font: 600 0.82rem/1 var(--mono);
  letter-spacing: 0.02em;
  text-decoration: none;
  border: 1px solid transparent;
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
}
.btn-primary, button.primary {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: var(--accent);
}
.btn-primary:hover { filter: none; background: color-mix(in srgb, var(--accent) 88%, var(--ink)); }
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); filter: none; }
button.act[disabled], .tenants button[disabled] {
  opacity: 0.4;
  cursor: not-allowed;
}
button.danger { color: var(--bad); border-color: color-mix(in srgb, var(--bad) 40%, var(--line)); background: transparent; }

.chip {
  font-family: var(--mono);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.28rem 0.55rem;
  border-radius: var(--radius);
  display: inline-flex;
  align-items: center;
}
.chip.inflight { background: var(--ship-inflight); color: var(--ship-inflight-ink); }
.chip.ok { background: var(--ship-ok); color: var(--ship-ok-ink); }
.chip.blocked { background: var(--ship-blocked); color: var(--ship-blocked-ink); }
.chip.failed { background: var(--ship-failed); color: var(--ship-failed-ink); }

.doctrine {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1rem;
  align-items: center;
  margin-top: 1.75rem;
  padding-top: 1.15rem;
  border-top: 1px solid var(--line);
  max-width: 40rem;
}
.doctrine p { margin: 0; font-size: 0.92rem; color: var(--ink-soft); line-height: 1.4; }
.doctrine strong { color: var(--ink); font-weight: 600; }

.hero-lamps {
  display: flex;
  gap: 1.1rem;
  margin: 0 0 1.4rem;
}
.hero-lamps .bulb {
  width: 1.35rem;
  height: 1.35rem;
  border-radius: 50%;
  border: 2px solid var(--line);
  background: var(--surface);
}
.hero-lamps .bulb.on {
  background: var(--ship-ok);
  border-color: var(--ship-ok);
  box-shadow: 0 0 0 5px color-mix(in srgb, var(--ship-ok) 18%, transparent);
}

.agents { margin-top: 1.5rem; max-width: 40rem; background: var(--raised); border: 1px solid var(--line); border-radius: 0.55rem; overflow: hidden; }
.agent {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.25rem 0.75rem;
  width: 100%;
  text-align: left;
  border: 0;
  border-bottom: 1px solid var(--line);
  border-left: 3px solid transparent;
  background: transparent;
  color: inherit;
  padding: 0.95rem 1.05rem;
  font: inherit;
  cursor: pointer;
}
.agent:last-child { border-bottom: 0; }
.agent:hover { background: var(--surface); }
.agent[aria-pressed="true"] {
  background: color-mix(in srgb, var(--accent) 10%, var(--surface));
  border-left-color: var(--accent);
}
.agent .who { font-weight: 700; font-size: 1.02rem; }
.agent .meta { grid-column: 1 / -1; font-family: var(--mono); font-size: 0.72rem; color: var(--ink-soft); }

.bus {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  position: relative;
  margin-top: 2rem;
  max-width: 40rem;
}
.bus::before {
  content: "";
  position: absolute;
  left: 10%;
  right: 10%;
  top: 2.15rem;
  height: 4px;
  background: var(--line);
  border-radius: 99px;
  transition: background 0.35s ease;
}
.bus.live::before { background: var(--ship-ok); }
.bus.ask::before { background: var(--accent); }
.lamp {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.85rem;
  border: 0;
  background: transparent;
  color: inherit;
  font: inherit;
  cursor: pointer;
  padding: 0;
}
.lamp .bulb {
  width: clamp(3.6rem, 9vw, 4.6rem);
  height: clamp(3.6rem, 9vw, 4.6rem);
  border-radius: 50%;
  border: 3px solid var(--line);
  background: var(--surface);
  box-shadow: inset 0 0 0 6px var(--raised);
  transition: background 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease, transform 0.25s ease;
}
.lamp.on .bulb {
  background: var(--ship-ok);
  border-color: var(--ship-ok);
  box-shadow: 0 0 0 10px color-mix(in srgb, var(--ship-ok) 20%, transparent);
  transform: scale(1.04);
}
.lamp .name {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.lamp:focus-visible { outline: 2px solid var(--accent); outline-offset: 6px; }

.gate-face {
  margin-top: 1.6rem;
  max-width: 40rem;
  padding: 1.4rem 1.3rem;
  background: var(--raised);
  border: 1px solid var(--line);
  border-left: 4px solid var(--line);
  border-radius: 0.55rem;
}
.gate-face.open { border-left-color: var(--ship-ok); }
.gate-face.closed { border-left-color: var(--ship-blocked); }
.gate-face .status {
  font: 700 0.72rem/1 var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0 0 0.55rem;
}
.gate-face.open .status { color: var(--ship-ok); }
.gate-face.closed .status { color: var(--ship-blocked); }
.gate-face p { margin: 0 0 1rem; color: var(--ink-mid); }

.tenants {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.5rem;
  max-width: 40rem;
}
.tenants button[aria-pressed="true"] {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: var(--accent);
}

.receipt, .install pre {
  margin: 1.35rem 0 0;
  padding: 1.1rem 1.15rem;
  background: var(--raised);
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  overflow-x: auto;
  font: 400 0.82rem/1.65 var(--mono);
  color: var(--ink);
  max-width: 42rem;
  white-space: pre-wrap;
}
.install .prompt, .receipt .prompt { color: var(--accent); user-select: none; }

footer.chapter {
  min-height: auto;
  padding: 2.5rem clamp(1.1rem, 4vw, 2.5rem) 3rem;
  align-content: start;
}
footer .foot {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1.2rem;
  justify-content: space-between;
  color: var(--ink-soft);
  font: 500 0.7rem/1.4 var(--mono);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  width: min(920px, 100%);
  margin: 0 auto;
}
footer .foot a { color: var(--ink-soft); text-decoration: none; }
footer .foot a:hover { color: var(--accent); }

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}
.reveal.in { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: 0.06s; }
.reveal.d2 { transition-delay: 0.12s; }
.reveal.d3 { transition-delay: 0.18s; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

.pile {
  margin-top: 1.5rem;
  max-width: 40rem;
  position: relative;
}
.pile.messy .agent {
  transform: rotate(var(--tilt));
  margin-left: var(--shove);
}
.pile.desk .agent.stale { opacity: 0.38; }
.pile.desk .agent.live {
  border-left-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, var(--raised));
}
.pile.desk::after {
  content: "";
  position: absolute;
  left: 1.15rem;
  top: 1.2rem;
  bottom: 1.2rem;
  width: 2px;
  background: var(--accent);
  opacity: 0.45;
  pointer-events: none;
}
.agent {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.15rem 0.75rem;
  width: 100%;
  text-align: left;
  border: 1px solid var(--line);
  border-left: 3px solid var(--line);
  background: var(--raised);
  color: inherit;
  padding: 0.85rem 1.05rem;
  font: inherit;
  cursor: pointer;
  margin-bottom: -1px;
  transition: transform 0.45s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.35s ease, margin 0.45s ease, background 0.3s ease, border-color 0.3s ease;
}
.agent .who { font-weight: 700; font-size: 1.02rem; }
.agent .doing { grid-column: 1 / -1; color: var(--ink-mid); font-size: 0.92rem; }
.agent .meta {
  grid-column: 1 / -1;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-soft);
}
.agent[aria-pressed="true"] { outline: 2px solid var(--accent); outline-offset: -2px; }
.talk {
  margin-top: 0.85rem;
  max-width: 40rem;
  min-height: 4.2rem;
  padding: 0.95rem 1.05rem;
  background: var(--raised);
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--ink-mid);
  white-space: pre-wrap;
}
.talk .on { color: var(--ink); }

.jewels {
  margin-top: 1.6rem;
  max-width: 42rem;
  border: 1px solid var(--line);
  border-radius: 0.55rem;
  overflow: hidden;
  background: var(--raised);
}
.jewel {
  display: grid;
  grid-template-columns: 7.2rem 1fr auto;
  gap: 0.55rem 0.9rem;
  align-items: baseline;
  padding: 0.88rem 1.05rem;
  border-bottom: 1px solid var(--line);
}
.jewel:last-child { border-bottom: 0; }
.jewel .name { font-weight: 700; }
.jewel .why { color: var(--ink-mid); font-size: 0.92rem; }
.jewel .crown {
  font: 700 0.62rem/1 var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
}
@media (max-width: 640px) {
  .jewel { grid-template-columns: 1fr auto; }
  .jewel .why { grid-column: 1 / -1; }
}