/* ============================================================
   NEXUS FLOW — MAIN STYLES
   Structure:
     1. Base & typography
     2. Nav
     3. Act 1 — the stage (origin node, errors, transform)
     4. Nodes (shared component)
     5. Act 2 — split section
     6. Act 3 — merge + CTA form
     7. Footer
     8. Wires & packets
     9. Responsive
    10. Reduced motion / no-anim fallbacks
   ============================================================ */


/* ---- 1. BASE ------------------------------------------------ */

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Blueprint grid painted on the whole page, very faint */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 48px 48px;
  z-index: 0;
}

main { position: relative; z-index: 1; }

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 750;
  font-stretch: 112%;
  line-height: 1.08;
  letter-spacing: -0.015em;
  margin: 0 0 0.6em;
}
h1 { font-size: var(--fs-hero); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); line-height: 1.25; }

h1 em { font-style: normal; color: var(--signal); }

p { margin: 0 0 1em; }
.lede { color: var(--ink-dim); font-size: calc(var(--fs-body) * 1.08); max-width: 34em; }
.micro { font-family: var(--font-mono); font-size: var(--fs-micro); color: var(--ink-faint); letter-spacing: 0.04em; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  font-weight: 600;
  letter-spacing: 0.22em;
  margin-bottom: 1.1rem;
}
.eyebrow--signal  { color: var(--signal); }
.eyebrow--error   { color: var(--error); }
.eyebrow--success { color: var(--success); }

a { color: var(--signal); }

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--signal); color: var(--bg);
  padding: 0.6rem 1rem; z-index: 100;
  font-family: var(--font-mono); font-size: var(--fs-small);
}
.skip-link:focus { left: 0; }

:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 3px;
  border-radius: 4px;
}


/* ---- 2. NAV -------------------------------------------------- */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.9rem var(--pad-x);
  z-index: 50;
  background: linear-gradient(to bottom, rgba(10,14,21,0.92), rgba(10,14,21,0));
  pointer-events: none;
}
.nav > * { pointer-events: auto; }

.nav__brand {
  display: flex; align-items: center; gap: 0.55rem;
  text-decoration: none; color: var(--ink);
}
.nav__led {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 8px var(--success-glow), 0 0 2px var(--success);
  animation: led-breathe 2.6s ease-in-out infinite;
}
@keyframes led-breathe {
  0%, 100% { opacity: 1; } 50% { opacity: 0.45; }
}
.nav__word {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  font-weight: 600;
  letter-spacing: 0.18em;
}
.nav__cta {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--ink);
  text-decoration: none;
  border: 1px solid var(--node-stroke);
  border-radius: 999px;
  padding: 0.5rem 1.05rem;
  background: rgba(13, 20, 32, 0.7);
  backdrop-filter: blur(6px);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.nav__cta:hover {
  border-color: var(--signal);
  color: var(--signal);
  box-shadow: 0 0 18px var(--signal-glow);
}


/* ---- 3. ACT 1 — THE STAGE ------------------------------------ */

/* Tall track supplies the scroll distance; stage stays pinned */
.stage-track { height: 520vh; position: relative; }

.stage {
  position: sticky;
  top: 0;
  height: 100vh;
  height: 100svh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: clamp(0.75rem, 3vh, 2rem);
  overflow: hidden;
  padding: clamp(3.5rem, 9vh, 5.5rem) 0 2rem;
}

.stage__grid {
  position: absolute; inset: 0;
  background: radial-gradient(ellipse 60% 50% at 50% 45%, rgba(86,200,255,0.05), transparent 70%);
}

/* Copy zone reserves a fixed block of vertical space in the flex
   stack, so the node below is GUARANTEED to never overlap the text —
   this holds at any viewport height, not just the ones tested. The
   four .copy-block variants crossfade on top of each other inside it. */
.copy-zone {
  position: relative;
  width: min(92%, 760px);
  min-height: clamp(210px, 40vh, 400px); /* JS overrides with a measured value on load */
  flex: none;
}

.copy-block {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  opacity: 0;
  transform: translateY(14px);
  transition: opacity var(--dur-slow) var(--ease), transform var(--dur-slow) var(--ease);
  pointer-events: none;
}
.copy-block.on {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.bridge-line {
  font-family: var(--font-display);
  font-stretch: 108%;
  font-weight: 650;
  font-size: clamp(1.3rem, 3vw, 2rem);
  color: var(--ink);
}

/* ── the node + orbiting errors ── */
.node-wrap {
  position: relative;
  flex: none;
}

/* Error tooltips */
.node-err {
  position: absolute;
  max-width: 240px;
  background: rgba(20, 12, 14, 0.88);
  border: 1px solid rgba(255, 98, 87, 0.5);
  border-left: 3px solid var(--error);
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.8rem;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  line-height: 1.45;
  opacity: 0;
  transform: translateY(10px) scale(0.96);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
  box-shadow: 0 6px 24px rgba(0,0,0,0.4), 0 0 20px var(--error-glow);
  z-index: 3;
}
.node-err.on { opacity: 1; transform: translateY(0) scale(1); }
.node-err.clear {
  opacity: 0;
  transform: translateY(-14px) scale(0.9);
  transition-duration: 0.45s;
}
.node-err__code {
  display: block;
  color: var(--error);
  font-weight: 600;
  letter-spacing: 0.14em;
  margin-bottom: 0.15rem;
}
.node-err__text { color: var(--ink-dim); }

/* Orbit positions (desktop) */
.node-err--1 { right: calc(100% + 2rem); top: -3.2rem; }
.node-err--2 { left:  calc(100% + 2rem); top: -2rem; }
.node-err--3 { right: calc(100% + 2.6rem); bottom: -1.4rem; }
.node-err--4 { left:  calc(100% + 2.6rem); bottom: -2.4rem; }

/* HUD chip */
.hud {
  position: absolute;
  top: calc(100% + 1.4rem);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 0.7rem;
  align-items: baseline;
  font-family: var(--font-mono);
  white-space: nowrap;
}
.hud__key { font-size: var(--fs-micro); letter-spacing: 0.16em; color: var(--ink-faint); }
.hud__val { font-size: 1.25rem; font-weight: 600; color: var(--warn); transition: color var(--dur) var(--ease); }
body[data-stage="6"] .hud__val,
body[data-stage="7"] .hud__val { color: var(--success); }
body[data-stage="0"] .hud { opacity: 0; }
.hud { transition: opacity var(--dur) var(--ease); }

/* Scroll cue */
.scroll-cue {
  position: absolute;
  bottom: 4.4rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center; gap: 0.5rem;
  transition: opacity var(--dur) var(--ease);
}
body:not([data-stage="0"]) .scroll-cue { opacity: 0; }
.scroll-cue__text {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.18em;
  color: var(--ink-faint);
}
.scroll-cue__line {
  width: 1px; height: 34px;
  background: linear-gradient(var(--signal), transparent);
  animation: cue-drop 1.8s var(--ease) infinite;
}
@keyframes cue-drop {
  0% { transform: scaleY(0); transform-origin: top; }
  55% { transform: scaleY(1); transform-origin: top; }
  56% { transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

.skip-story {
  position: absolute;
  bottom: 1.3rem;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.1em;
  color: var(--ink-faint);
  text-decoration: none;
  transition: color var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.skip-story:hover { color: var(--signal); }
body:not([data-stage="0"]) .skip-story { opacity: 0; pointer-events: none; }


/* ---- 4. NODES (shared component) ------------------------------ */

.node {
  position: relative;
  background: var(--node-fill);
  border: 1px solid var(--node-stroke);
  border-radius: var(--radius);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.45);
  transition:
    border-color var(--dur-slow) var(--ease),
    box-shadow var(--dur-slow) var(--ease),
    transform var(--dur) var(--ease);
}

.node__head {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.75rem 1rem;
  background: var(--node-fill-2);
  border-bottom: 1px solid var(--node-stroke);
  border-radius: var(--radius) var(--radius) 0 0;
  font-family: var(--font-mono);
}
.node__led {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--warn);
  box-shadow: 0 0 8px rgba(255,180,84,0.5);
  transition: background var(--dur-slow) var(--ease), box-shadow var(--dur-slow) var(--ease);
  flex: none;
}
.node__led--ok    { background: var(--success); box-shadow: 0 0 8px var(--success-glow); }
.node__led--pulse { background: var(--signal); box-shadow: 0 0 10px var(--signal-glow); animation: led-breathe 2s ease-in-out infinite; }
.node__label {
  font-size: var(--fs-micro);
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--ink);
}
.node__id {
  margin-left: auto;
  font-size: var(--fs-micro);
  color: var(--ink-faint);
  letter-spacing: 0.08em;
}

.node__port {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--node-stroke);
  transition: border-color var(--dur-slow) var(--ease), box-shadow var(--dur-slow) var(--ease);
}
.node__port--out { bottom: -7px; }
.node__port--in  { top: -7px; }

/* ── the ORIGIN node — bigger, more chrome, "expensive" ── */
.node--origin {
  width: min(88vw, 380px);
  border-width: 2px;
}
.node--origin::after { /* soft ambient glow */
  content: "";
  position: absolute; inset: -28px;
  border-radius: calc(var(--radius) + 28px);
  background: radial-gradient(ellipse at center, var(--signal-glow), transparent 68%);
  opacity: 0.35;
  z-index: -1;
  transition: opacity var(--dur-slow) var(--ease), background var(--dur-slow) var(--ease);
  animation: origin-breathe 4.5s ease-in-out infinite;
}
@keyframes origin-breathe {
  0%, 100% { opacity: 0.28; } 50% { opacity: 0.45; }
}

/* Corner ticks that make it feel machined */
.node__corners::before, .node__corners::after {
  content: "";
  position: absolute;
  width: 14px; height: 14px;
  border: 2px solid var(--node-stroke);
  transition: border-color var(--dur-slow) var(--ease);
}
.node__corners::before { top: -7px; left: -7px; border-right: none; border-bottom: none; }
.node__corners::after  { bottom: -7px; right: -7px; border-left: none; border-top: none; }

.node--origin .node__body { padding: 1.1rem 1.15rem 1.25rem; display: grid; gap: 0.8rem; }

.metric {
  display: grid;
  grid-template-columns: 6.4rem 1fr;
  align-items: center;
  gap: 0.7rem;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--ink-faint);
  letter-spacing: 0.06em;
}
.metric__bar {
  height: 5px;
  background: rgba(255,255,255,0.06);
  border-radius: 3px;
  overflow: hidden;
}
.metric__bar i {
  display: block;
  height: 100%;
  width: var(--w, 70%);
  background: var(--signal);
  border-radius: 3px;
  transition: width 1s var(--ease), background 1s var(--ease);
}

/* ── STRAIN STATES (driven by body[data-stage]) ── */

/* Metrics degrade as errors stack */
body[data-stage="2"] .node--origin .metric i { width: calc(var(--w) * 0.72); background: var(--warn); }
body[data-stage="3"] .node--origin .metric i { width: calc(var(--w) * 0.5); background: var(--warn); }
body[data-stage="4"] .node--origin .metric i,
body[data-stage="5"] .node--origin .metric i { width: calc(var(--w) * 0.3); background: var(--error); }

/* Border + LED shift through warn → error */
body[data-stage="2"] .node--origin,
body[data-stage="3"] .node--origin { border-color: rgba(255,180,84,0.65); }
body[data-stage="2"] .node--origin::after,
body[data-stage="3"] .node--origin::after { background: radial-gradient(ellipse at center, rgba(255,180,84,0.28), transparent 68%); }
body[data-stage="3"] .node--origin .node__led,
body[data-stage="4"] .node--origin .node__led { background: var(--error); box-shadow: 0 0 10px var(--error-glow); animation: led-panic 0.7s steps(2) infinite; }
@keyframes led-panic { 50% { opacity: 0.25; } }

body[data-stage="4"] .node--origin,
body[data-stage="5"] .node--origin {
  border-color: var(--error);
  animation: node-flicker 2.4s linear infinite;
}
body[data-stage="4"] .node--origin::after,
body[data-stage="5"] .node--origin::after { background: radial-gradient(ellipse at center, var(--error-glow), transparent 68%); }

@keyframes node-flicker {
  0%, 100% { opacity: 1; }
  92% { opacity: 1; }
  93% { opacity: 0.82; }
  94% { opacity: 1; }
  97% { opacity: 0.88; }
  98% { opacity: 1; }
}

/* ── SUCCESS STATE ── */
body[data-stage="6"] .node--origin,
body[data-stage="7"] .node--origin {
  border-color: var(--success);
  animation: none;
  box-shadow: 0 16px 48px rgba(0,0,0,0.45), 0 0 42px var(--success-glow);
}
body[data-stage="6"] .node--origin::after,
body[data-stage="7"] .node--origin::after { background: radial-gradient(ellipse at center, var(--success-glow), transparent 68%); opacity: 0.5; }
body[data-stage="6"] .node--origin .node__led,
body[data-stage="7"] .node--origin .node__led { background: var(--success); box-shadow: 0 0 10px var(--success-glow); animation: led-breathe 2.4s ease-in-out infinite; }
body[data-stage="6"] .node--origin .metric i,
body[data-stage="7"] .node--origin .metric i { width: calc(var(--w) * 1.18); max-width: 100%; background: var(--success); }
body[data-stage="6"] .node--origin .node__corners::before,
body[data-stage="6"] .node--origin .node__corners::after,
body[data-stage="7"] .node--origin .node__corners::before,
body[data-stage="7"] .node--origin .node__corners::after { border-color: var(--success); }
body[data-stage="7"] .node--origin .node__port--out { border-color: var(--success); box-shadow: 0 0 12px var(--success-glow); }

/* One-shot pulse when success lands (class added by JS) */
.node--origin.pulse { animation: success-pulse 0.9s var(--ease) 1; }
@keyframes success-pulse {
  0% { transform: scale(1); }
  35% { transform: scale(1.035); }
  100% { transform: scale(1); }
}


/* ---- 5. ACT 2 — SPLIT ----------------------------------------- */

.split { position: relative; padding: 0 var(--pad-x) clamp(4rem, 9vh, 7rem); }

.split__grid {
  max-width: var(--page-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1.2rem, 2.4vw, 2rem);
}

.split-card {
  opacity: 0;
  transform: translateY(36px);
  transition: opacity var(--dur-slow) var(--ease), transform var(--dur-slow) var(--ease);
}
.split-card.is-visible { opacity: 1; transform: none; }
.split-card:nth-child(2) { transition-delay: 0.12s; }
.split-card:nth-child(3) { transition-delay: 0.24s; }

.node--card { height: 100%; display: flex; flex-direction: column; }
.node--card .node__content { padding: 1.3rem 1.4rem 1.5rem; }
.node--card:hover {
  border-color: var(--signal);
  box-shadow: 0 16px 48px rgba(0,0,0,0.45), 0 0 26px var(--signal-glow);
  transform: translateY(-4px);
}

.steps {
  list-style: none;
  margin: 0.4rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.65rem;
}
.steps li {
  position: relative;
  padding-left: 1.35rem;
  color: var(--ink-dim);
  font-size: var(--fs-small);
  line-height: 1.55;
}
.steps li::before {
  content: "";
  position: absolute;
  left: 0; top: 0.5em;
  width: 8px; height: 8px;
  border-radius: 2px;
  background: var(--success);
  box-shadow: 0 0 6px var(--success-glow);
}
.steps strong { color: var(--ink); font-weight: 600; }
.node--card p { color: var(--ink-dim); font-size: var(--fs-small); }
.node--card h3 { color: var(--ink); }


/* ---- 6. ACT 3 — MERGE + CTA ------------------------------------ */

.merge { position: relative; padding: 0 var(--pad-x) clamp(5rem, 10vh, 8rem); }

.cta-wrap { max-width: 620px; margin: 0 auto; }

.cta-node {
  opacity: 0;
  transform: translateY(36px);
  transition: opacity var(--dur-slow) var(--ease), transform var(--dur-slow) var(--ease),
              border-color var(--dur-slow) var(--ease), box-shadow var(--dur-slow) var(--ease);
}
.cta-node.is-visible {
  opacity: 1; transform: none;
  border-color: var(--signal);
  box-shadow: 0 24px 64px rgba(0,0,0,0.5), 0 0 44px var(--signal-glow);
}
.cta-node.is-visible .node__port--in { border-color: var(--signal); box-shadow: 0 0 12px var(--signal-glow); }

.cta-node .node__content { padding: clamp(1.4rem, 3.5vw, 2.2rem); }
.cta-node h2 { margin-bottom: 0.35em; }

.intake { display: grid; gap: 1.1rem; margin-top: 1.6rem; }

.field { display: grid; gap: 0.45rem; }
.field--split { grid-template-columns: 1fr 1fr; gap: 1rem; }
.field--split > div { display: grid; gap: 0.45rem; }

.field label {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.06em;
  color: var(--ink-dim);
}

.intake input,
.intake textarea {
  width: 100%;
  background: rgba(10, 14, 21, 0.75);
  border: 1px solid var(--node-stroke);
  border-radius: var(--radius-sm);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--fs-small);
  padding: 0.75rem 0.9rem;
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
  resize: vertical;
}
.intake input::placeholder,
.intake textarea::placeholder { color: var(--ink-faint); }
.intake input:focus,
.intake textarea:focus {
  outline: none;
  border-color: var(--signal);
  box-shadow: 0 0 0 3px rgba(86, 200, 255, 0.15);
}
.intake input.invalid,
.intake textarea.invalid { border-color: var(--error); }

.hp { position: absolute; left: -9999px; opacity: 0; height: 0; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  width: 100%;
  padding: 0.95rem 1.4rem;
  background: var(--signal);
  color: #06202E;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-display);
  font-stretch: 106%;
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), background var(--dur) var(--ease);
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 8px 28px var(--signal-glow); }
.btn:active { transform: translateY(0); }
.btn[disabled] { opacity: 0.6; cursor: wait; }
.btn__arrow { transition: transform var(--dur) var(--ease); }
.btn:hover .btn__arrow { transform: translateX(4px); }

.form-note {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  color: var(--ink-faint);
  text-align: center;
  margin: 0.2rem 0 0;
}
.form-note.error { color: var(--error); }

.intake-done { text-align: center; padding: 1.6rem 0 0.6rem; }
.intake-done__led {
  display: inline-block;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 14px var(--success-glow);
  margin-bottom: 0.9rem;
  animation: led-breathe 2.2s ease-in-out infinite;
}
.intake-done p { color: var(--ink-dim); font-size: var(--fs-small); }


/* ---- 7. FOOTER -------------------------------------------------- */

.footer {
  border-top: 1px solid rgba(51, 65, 92, 0.4);
  padding: 3rem var(--pad-x) 3.4rem;
}
.footer__inner {
  max-width: var(--page-max);
  margin: 0 auto;
  display: grid;
  gap: 0.7rem;
  text-align: center;
  justify-items: center;
}
.footer__brand { display: flex; align-items: center; gap: 0.55rem; }
.footer__tag {
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.1em;
  color: var(--ink-faint);
  margin: 0;
}
.footer__mail {
  font-family: var(--font-mono);
  font-size: var(--fs-small);
  color: var(--signal);
  text-decoration: none;
}
.footer__mail:hover { text-decoration: underline; }
.footer__legal { font-size: var(--fs-micro); color: var(--ink-faint); margin: 0.6rem 0 0; }


/* ---- 8. WIRES & PACKETS ------------------------------------------ */

.wire-zone {
  position: relative;
  height: clamp(180px, 26vh, 280px);
  max-width: var(--page-max);
  margin: 0 auto;
}
.wire-svg {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  overflow: visible;
}
.wire-svg path {
  fill: none;
  stroke: var(--wire-idle);
  stroke-width: 2;
}
.wire-svg path.lit { stroke: var(--signal); filter: drop-shadow(0 0 5px var(--signal-glow)); }

.packet-layer { position: absolute; inset: 0; pointer-events: none; }
.packet {
  position: absolute;
  top: 0; left: 0;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 9px var(--signal-glow), 0 0 3px var(--signal);
  opacity: 0;
  offset-rotate: 0deg;
}
.live .packet { animation: packet-travel var(--pk-dur, 3.2s) linear var(--pk-delay, 0s) infinite; }
@keyframes packet-travel {
  0%   { offset-distance: 0%;   opacity: 0; }
  8%   { opacity: 1; }
  88%  { opacity: 1; }
  100% { offset-distance: 100%; opacity: 0; }
}


/* ---- 9. RESPONSIVE ------------------------------------------------ */

@media (max-width: 900px) {
  .split__grid { grid-template-columns: 1fr; max-width: 560px; }
  .wire-zone { height: 130px; }
}

@media (max-width: 760px) {
  .stage-track { height: 560vh; }

  /* Error tooltips stack near the node instead of orbiting wide */
  .node-err { max-width: 200px; }
  .node-err--1 { right: auto; left: -1.2rem;  top: -4.6rem; }
  .node-err--2 { left: auto;  right: -1.2rem; top: -2.6rem; }
  .node-err--3 { right: auto; left: -0.8rem;  bottom: -3.4rem; top: auto; }
  .node-err--4 { left: auto;  right: -0.8rem; bottom: -5rem;  top: auto; }

  .node--origin { width: min(78vw, 320px); }
  .hud { top: calc(100% + 4.6rem); }

  .field--split { grid-template-columns: 1fr; }

  /* Hero/transform copy wraps to more lines on narrow screens —
     give the reserved zone more room so it still never collides
     with the node below. */
  .copy-zone { min-height: clamp(220px, 44vh, 400px); }
  .stage { gap: clamp(1.5rem, 5vh, 3rem); padding: clamp(4rem, 11vh, 6rem) 0 1.5rem; }
}

@media (max-width: 400px) {
  .copy-zone { min-height: clamp(240px, 48vh, 420px); }
}


/* ---- 10. REDUCED MOTION / FALLBACKS -------------------------------- */

/* If the visitor prefers reduced motion, or if GSAP fails to load
   (body gets .no-anim from js/main.js), everything renders resolved
   and readable with no scroll choreography. */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

body.no-anim .stage-track { height: auto; }
body.no-anim .stage {
  position: static;
  height: auto;
  padding: 7rem 0 4rem;
  flex-direction: column;
  gap: 2.5rem;
  overflow: visible;
}
body.no-anim .copy-zone { min-height: auto; }
body.no-anim .copy-block {
  position: static;
  inset: auto;
  transform: none;
  opacity: 1;
  pointer-events: auto;
}
body.no-anim .copy-bridge { display: none; }
body.no-anim .node-err {
  position: static;
  opacity: 1;
  transform: none;
  max-width: 100%;
  margin: 0.4rem auto;
}
body.no-anim .node-wrap {
  margin-top: 1rem;
  display: grid;
  gap: 0.6rem;
  justify-items: center;
}
body.no-anim .hud, body.no-anim .scroll-cue, body.no-anim .skip-story { display: none; }
body.no-anim .split-card, body.no-anim .cta-node { opacity: 1; transform: none; }
body.no-anim .wire-zone { height: 70px; }
body.no-anim .wire-svg path { stroke: var(--wire-idle); }
body.no-anim .packet { display: none; }
/* In no-anim mode show the success state permanently */
body.no-anim .node--origin { border-color: var(--success); }
body.no-anim .node--origin .node__led { background: var(--success); }