/* ==========================================================================
   CoVince new home - platform tour  (owner: agent 4)
   Semantic tokens from css/tokens.css only; cinematic utilities from css/cinema.css.
   Desktop >= 1000px: sticky full-bleed stage behind the chapter text, a ring rail
   on the right. Below 1000px: chapters stacked, each with its own picture.
   ========================================================================== */

#nh-platform.plt-mounted { min-height: 0; padding: 0; }

.plt {
  --plt-ease: var(--nh-ease-cinema, cubic-bezier(0.22, 1, 0.36, 1));
  --plt-dur: var(--nh-dur-cinema, 1400ms);
  position: relative;
  padding-block: var(--nh-section-y) 0;
  color: var(--nh-text);
}

.plt-sr {
  position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap; border: 0;
}
.plt-ico { width: 1.2em; height: 1.2em; flex: none; display: inline-block; vertical-align: middle; }

/* ------------------------------------------------------------------ intro */
.plt-intro {
  max-width: 60rem;
  margin: 0 auto;
  padding: 0 var(--nh-gutter) var(--nh-space-8);
  text-align: center;
}
.plt-kicker, .plt-step__kicker {
  margin: 0 0 var(--nh-space-4);
  font-family: var(--nh-font-display);
  font-size: var(--nh-fs-xs);
  font-weight: var(--nh-weight-medium);
  letter-spacing: var(--nh-tracking-eyebrow);
  text-transform: uppercase;
  color: var(--nh-accent);
}
.plt-title {
  margin: 0 auto;
  max-width: 16ch;
  font-family: var(--nh-font-display);
  font-size: var(--nh-fs-display);
  font-weight: var(--nh-weight-medium);
  line-height: var(--nh-lh-tight);
  letter-spacing: var(--nh-tracking-display);
  color: var(--nh-heading);
  text-wrap: balance;
}
.plt-lede {
  margin: var(--nh-space-5) auto 0;
  max-width: 38rem;
  font-size: var(--nh-fs-lg);
  line-height: var(--nh-lh-text);
  color: var(--nh-text-muted);
  text-wrap: pretty;
}

/* motion toggle (pause everything that moves by itself) */
.plt-motion {
  display: inline-flex; align-items: center; gap: 0.5em;
  min-height: var(--nh-tap); padding: 0 1em; margin-top: var(--nh-space-5);
  border: 1px solid var(--nh-border-strong); border-radius: var(--nh-radius-pill);
  background: transparent; color: var(--nh-text-muted);
  font: inherit; font-size: var(--nh-fs-sm); cursor: pointer;
  transition: color var(--nh-dur-fast), border-color var(--nh-dur-fast), background-color var(--nh-dur-fast);
}
.plt-motion:hover { color: var(--nh-text); border-color: var(--nh-text); }
.plt-motion .plt-ico { width: 1em; height: 1em; }
.plt-motion:focus-visible { border-radius: var(--nh-radius-pill); }

/* ------------------------------------------------------------------ story */
.plt-story { position: relative; }
.plt-steps { list-style: none; margin: 0; padding: 0; position: relative; z-index: 1; }

.plt-step__kicker { display: flex; align-items: baseline; flex-wrap: wrap; gap: 0.35em 0.9em; }
.plt-step__num {
  font-variant-numeric: tabular-nums;
  color: var(--nh-text-subtle);
  letter-spacing: 0.08em;
}
.plt-step__day { color: var(--nh-text-muted); letter-spacing: 0.12em; }
.plt-step__day::before { content: ""; display: inline-block; width: 1.6em; height: 1px; margin-right: 0.9em; vertical-align: middle; background: var(--nh-border-strong); }
.plt-step__title {
  margin: 0;
  max-width: 15ch;
  font-family: var(--nh-font-display);
  font-size: clamp(2rem, 1.35rem + 2.1vw, 3.25rem);
  font-weight: var(--nh-weight-medium);
  line-height: var(--nh-lh-heading);
  letter-spacing: var(--nh-tracking-heading);
  color: var(--nh-heading);
  text-wrap: balance;
}
.plt-step__text {
  margin: var(--nh-space-4) 0 0;
  max-width: 33rem;
  font-size: clamp(1.0625rem, 1rem + 0.25vw, 1.1875rem);
  line-height: var(--nh-lh-text);
  /* QA 2026-09-27: over the grained, fading stage the muted token read 4.27:1 in light; a step closer to --nh-text keeps the hierarchy and clears 4.5 */
  color: color-mix(in srgb, var(--nh-text) 80%, var(--nh-bg));
  text-wrap: pretty;
}
.plt-step__proof { list-style: none; margin: var(--nh-space-4) 0 0; padding: 0; display: grid; gap: var(--nh-space-2); }
.plt-step__proof li { display: flex; align-items: flex-start; gap: 0.7em; font-size: var(--nh-fs-base); line-height: 1.45; color: var(--nh-text); }
.plt-step__proof .plt-ico { color: var(--nh-accent); width: 1.15em; height: 1.15em; margin-top: 0.12em; }

.plt-link {
  display: inline-flex; align-items: center; gap: 0.55em;
  min-height: var(--nh-tap); margin-top: var(--nh-space-3);
  font-family: var(--nh-font-display); font-weight: var(--nh-weight-medium); font-size: var(--nh-fs-base);
  color: var(--nh-accent); text-decoration: none;
}
.plt-link span { background: linear-gradient(currentColor, currentColor) 0 100% / 0 1px no-repeat; transition: background-size var(--nh-dur-base) var(--nh-ease-out); padding-block: 2px; }
.plt-link:hover span { background-size: 100% 1px; }
.plt-link .plt-ico { transition: transform var(--nh-dur-base) var(--nh-ease-out); }
.plt-link:hover .plt-ico { transform: translateX(calc(4px * var(--nh-move, 1))); }

/* the step text arrives (JS adds .is-in; without JS nothing is hidden) */
.plt-js .plt-step__card > * { transition: opacity var(--nh-dur-slower) var(--nh-ease-out), transform var(--nh-dur-slower) var(--nh-ease-out); }
.plt-js .plt-step:not(.is-in) .plt-step__card > * { opacity: 0; transform: translateY(calc(var(--nh-reveal-distance, 28px))); }
.plt-js .plt-step.is-in .plt-step__card > :nth-child(2) { transition-delay: 60ms; }
.plt-js .plt-step.is-in .plt-step__card > :nth-child(3) { transition-delay: 120ms; }
.plt-js .plt-step.is-in .plt-step__card > :nth-child(n+4) { transition-delay: 180ms; }

/* ------------------------------------------------------------------ media frames */
.plt-frame { background: radial-gradient(120% 90% at 60% 40%, var(--nh-p-teal-800, #073a3a), var(--nh-p-ink-950, #050808)); }
.plt-frame > video, .plt-frame > img { opacity: 0; transition: opacity var(--nh-dur-slower) ease-out; }
.plt-frame.is-ready > video, .plt-frame > img { opacity: 1; }

/* ------------------------------------------------------------------ interface vignettes (decorative) */
.plt-vig { position: absolute; z-index: 5; pointer-events: none; }
.plt-ui {
  width: 100%;
  padding: 16px 18px;
  border-radius: var(--nh-radius-lg);
  background: var(--nh-surface-glass);
  border: 1px solid var(--nh-border);
  -webkit-backdrop-filter: blur(18px) saturate(1.2);
  backdrop-filter: blur(18px) saturate(1.2);
  box-shadow: var(--nh-shadow-3);
  color: var(--nh-text);
  font-size: 14px;
  line-height: 1.4;
}
.plt-ui p { margin: 0; }
.plt-ui .plt-ico { width: 16px; height: 16px; }
.plt-ui__head { display: flex; align-items: center; gap: 8px; margin-bottom: 12px; font-weight: var(--nh-weight-medium); font-size: 13px; letter-spacing: 0.02em; }
.plt-ui__meta { margin-left: auto; color: var(--nh-text-subtle); font-weight: var(--nh-weight-regular); font-variant-numeric: tabular-nums; }
.plt-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--nh-accent); box-shadow: 0 0 0 4px var(--nh-accent-soft); }
.plt-rec { width: 9px; height: 9px; border-radius: 50%; background: var(--nh-bad); box-shadow: 0 0 0 4px rgba(255, 107, 107, 0.18); }

/* items inside a vignette arrive one by one when their chapter is on */
.plt-ui [style*="--i"] { opacity: 0; transform: translateY(calc(10px * var(--nh-move, 1))); transition: opacity 500ms var(--nh-ease-out), transform 600ms var(--nh-ease-out); transition-delay: calc(350ms + var(--i) * 260ms); }
.plt-shot.is-active .plt-ui [style*="--i"],
.plt-step.is-in .plt-ui [style*="--i"],
html:not(.nh-js) .plt-ui [style*="--i"] { opacity: 1; transform: none; }

.plt-msg { display: flex; gap: 10px; align-items: flex-start; padding: 8px 0; border-top: 1px solid var(--nh-divider); }
.plt-msg:first-of-type { border-top: 0; }
.plt-av { flex: none; width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center; font-size: 12px; font-weight: var(--nh-weight-semibold); color: var(--nh-p-teal-950, #021312); }
.plt-av--a { background: var(--nh-p-teal-300, #62d6cd); }
.plt-av--b { background: var(--nh-p-dawn-300, #ffd9a0); }
.plt-check { flex: none; width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center; color: var(--nh-accent); border: 1px solid var(--nh-accent); }
.plt-check .plt-ico { width: 14px; height: 14px; }
.plt-msg--action p, .plt-line--act p { color: var(--nh-accent); font-weight: var(--nh-weight-medium); padding-top: 3px; }

.plt-ui--memory { display: flex; flex-wrap: wrap; gap: 8px; }
.plt-ui--memory .plt-ui__head { width: 100%; margin-bottom: 4px; }
.plt-ring-ico { display: grid; place-items: center; width: 26px; height: 26px; border-radius: 50%; border: 1px solid var(--nh-accent); color: var(--nh-accent); }
.plt-chip { display: inline-block; padding: 6px 12px; border-radius: var(--nh-radius-pill); border: 1px solid var(--nh-border-strong); font-size: 13px; }

.plt-say { font-size: 16px; font-family: var(--nh-font-display); line-height: 1.35; }
.plt-wave { display: flex; align-items: center; gap: 3px; height: 26px; margin: 10px 0 12px; color: var(--nh-accent); }
.plt-wave i { width: 3px; height: 30%; border-radius: 2px; background: currentColor; animation: plt-wave 1.1s ease-in-out infinite; }
.plt-wave i:nth-child(3n) { animation-delay: -0.3s; }
.plt-wave i:nth-child(3n+1) { animation-delay: -0.6s; }
.plt-wave i:nth-child(4n) { animation-delay: -0.85s; }
@keyframes plt-wave { 0%, 100% { height: 22%; } 50% { height: 100%; } }
.plt-opt { display: block; margin-top: 8px; padding: 9px 12px; border-radius: var(--nh-radius-sm); border: 1px solid var(--nh-border-strong); font-size: 13.5px; }
.plt-opt:first-of-type { border-color: var(--nh-accent); background: var(--nh-accent-soft); }

.plt-line { display: grid; grid-template-columns: 44px 1fr; gap: 8px; align-items: start; padding: 7px 0; border-top: 1px solid var(--nh-divider); }
.plt-line:first-of-type { border-top: 0; }
.plt-line b { font-weight: var(--nh-weight-medium); font-variant-numeric: tabular-nums; color: var(--nh-accent); font-size: 13px; padding-top: 1px; }
.plt-line--act { grid-template-columns: 26px 1fr; gap: 12px; }

.plt-ui--slides { position: relative; padding: 14px; }
.plt-slide { position: relative; aspect-ratio: 16 / 9; border-radius: var(--nh-radius-sm); background: var(--nh-surface); border: 1px solid var(--nh-border); padding: 9% 8%; display: grid; align-content: start; gap: 8px; }
.plt-slide i { display: block; border-radius: 3px; background: var(--nh-border-strong); }
.plt-slide__t { width: 58%; height: 12px; background: var(--nh-text) !important; opacity: 0.8; }
.plt-slide__l { width: 44%; height: 6px; }
.plt-slide__l--s { width: 32%; }
.plt-slide__img { position: absolute; right: 8%; top: 22%; width: 34%; aspect-ratio: 1; border-radius: 50% !important; background: radial-gradient(circle at 35% 35%, var(--nh-p-dawn-300, #ffd9a0), var(--nh-p-teal-500, #13989a)) !important; }
.plt-cursor { position: absolute; display: flex; align-items: flex-start; gap: 2px; color: var(--nh-p-dawn-300, #ffd9a0); animation: plt-drift-a 7s ease-in-out infinite; }
.plt-cursor em { font-style: normal; font-size: 11px; font-weight: var(--nh-weight-semibold); padding: 2px 7px; margin-top: 12px; border-radius: var(--nh-radius-pill); background: currentColor; }
.plt-cursor em { color: var(--nh-p-teal-950, #021312); }
.plt-cursor--a { left: 22%; top: 46%; }
.plt-cursor--a em { background: var(--nh-p-dawn-300, #ffd9a0); }
.plt-cursor--b { left: 62%; top: 16%; color: var(--nh-p-teal-300, #62d6cd); animation-name: plt-drift-b; animation-duration: 9s; }
.plt-cursor--b em { background: var(--nh-p-teal-300, #62d6cd); }
@keyframes plt-drift-a { 0%, 100% { transform: translate(0, 0); } 40% { transform: translate(40px, -14px); } 70% { transform: translate(18px, 12px); } }
@keyframes plt-drift-b { 0%, 100% { transform: translate(0, 0); } 35% { transform: translate(-36px, 30px); } 75% { transform: translate(-10px, 48px); } }

.plt-ui--tiles { display: grid; grid-template-columns: 1.4fr 1fr 0.8fr; gap: 10px; padding: 12px; }
.plt-tile { position: relative; display: flex; flex-direction: column; justify-content: flex-end; gap: 6px; min-height: 92px; padding: 10px; border-radius: var(--nh-radius-sm); background: var(--nh-accent-soft); border: 1px solid var(--nh-border); color: var(--nh-accent); }
.plt-tile svg { width: 100%; height: 44px; }
.plt-tile span { color: var(--nh-text-muted); font-size: 12px; }
.plt-tile--bars { flex-direction: row; align-items: flex-end; gap: 5px; padding-bottom: 28px; }
.plt-tile--bars i { flex: 1; height: var(--h); border-radius: 3px 3px 0 0; background: currentColor; opacity: 0.85; transform-origin: bottom; transform: scaleY(0.2); transition: transform 900ms var(--nh-ease-out) 500ms; }
.plt-shot.is-active .plt-tile--bars i, .plt-step.is-in .plt-tile--bars i { transform: none; }
.plt-tile--bars span { position: absolute; left: 10px; bottom: 8px; }
.plt-tile--ring { align-items: center; justify-content: center; }
.plt-tile--ring svg { width: 52px; height: 52px; }
.plt-tile--ring span { position: absolute; inset: 0; display: grid; place-items: center; color: var(--nh-text); font-size: 13px; font-weight: var(--nh-weight-medium); padding-bottom: 0; }

/* Syner Suite: three walls of three portrait screens, seen from inside the room */
.plt-ui--walls { padding: 16px 16px 12px; }
.plt-room { display: flex; justify-content: center; align-items: center; gap: 4px; perspective: 420px; height: 96px; }
.plt-wall { display: flex; gap: 3px; height: 100%; }
.plt-wall i { display: block; width: 22px; height: 100%; border-radius: 3px; border: 1px solid var(--nh-accent); background: linear-gradient(180deg, var(--nh-accent-soft), rgba(98, 214, 205, 0.28)); }
.plt-wall--c i { width: 26px; }
.plt-wall--l { transform: rotateY(38deg); transform-origin: right center; }
.plt-wall--r { transform: rotateY(-38deg); transform-origin: left center; }
.plt-wall--c i:nth-child(2) { background: linear-gradient(180deg, var(--nh-p-dawn-300, #ffd9a0), var(--nh-p-teal-500, #13989a)); border-color: transparent; }
.plt-room__cap { margin: 10px 0 0 !important; text-align: center; font-size: 12.5px; color: var(--nh-text-muted); letter-spacing: 0.02em; }

.plt-ui--devices { display: flex; flex-wrap: wrap; gap: 8px; padding: 10px; }
.plt-ui--devices span { flex: 1 1 auto; display: inline-flex; align-items: center; justify-content: center; gap: 7px; padding: 10px 12px; border-radius: var(--nh-radius-pill); border: 1px solid var(--nh-border-strong); font-size: 13px; }
.plt-ui--devices .plt-ico { color: var(--nh-accent); }

/* ------------------------------------------------------------------ CrewMate playground */
.plt-cm {
  margin-top: var(--nh-space-5);
  padding: var(--nh-space-5);
  max-width: 34rem;
  border-radius: var(--nh-radius-lg);
  background: var(--nh-surface-glass);
  border: 1px solid var(--nh-border);
  -webkit-backdrop-filter: blur(16px);
  backdrop-filter: blur(16px);
  box-shadow: var(--nh-shadow-2);
}
.plt-cm__head { display: flex; align-items: center; gap: 10px; }
.plt-cm__title { font-family: var(--nh-font-display); font-weight: var(--nh-weight-medium); font-size: var(--nh-fs-lg); color: var(--nh-heading); }
.plt-cm__tag { margin-left: auto; padding: 3px 10px; border-radius: var(--nh-radius-pill); border: 1px solid var(--nh-border-strong); font-size: var(--nh-fs-2xs); letter-spacing: 0.08em; text-transform: uppercase; color: var(--nh-text-muted); }
.plt-cm__hint { margin: 6px 0 14px; font-size: var(--nh-fs-sm); color: var(--nh-text-muted); }
.plt-cm__jobs { display: flex; flex-wrap: wrap; gap: 8px; }
.plt-cm__job {
  min-height: var(--nh-tap); padding: 0 16px;
  border-radius: var(--nh-radius-pill);
  border: 1px solid var(--nh-btn-secondary-border);
  background: var(--nh-btn-secondary-bg);
  color: var(--nh-text);
  font: inherit; font-size: var(--nh-fs-sm);
  cursor: pointer;
  transition: background-color var(--nh-dur-fast), border-color var(--nh-dur-fast), color var(--nh-dur-fast);
}
.plt-cm__job:hover { border-color: var(--nh-accent); color: var(--nh-accent); }
.plt-cm__job[aria-pressed="true"] { background: var(--nh-btn-primary-bg); color: var(--nh-btn-primary-text); border-color: transparent; }
.plt-cm__job:focus-visible { border-radius: var(--nh-radius-pill); }
.plt-cm__chat { display: none; margin-top: 16px; }
.plt-cm__chat.is-open { display: grid; gap: 12px; }
.plt-cm__you {
  justify-self: end; max-width: 85%;
  padding: 9px 14px; border-radius: 18px 18px 4px 18px;
  background: var(--nh-accent-soft); border: 1px solid var(--nh-border);
  font-size: var(--nh-fs-sm);
}
.plt-cm__bot { display: grid; gap: 8px; }
.plt-cm__who { display: inline-flex; align-items: center; gap: 8px; font-size: var(--nh-fs-sm); font-weight: var(--nh-weight-medium); }
.plt-cm__avatar { position: relative; display: grid; place-items: center; width: 28px; height: 28px; border-radius: 50%; color: var(--nh-accent); border: 1px solid var(--nh-accent); }
.plt-cm__avatar::after { content: ""; position: absolute; inset: -5px; border-radius: 50%; border: 1px solid var(--nh-accent); opacity: 0.35; }
.plt-cm__avatar .plt-ico { width: 15px; height: 15px; }
.plt-cm__status { font-size: var(--nh-fs-xs); color: var(--nh-text-subtle); font-variant-numeric: tabular-nums; min-height: 1.4em; }
.plt-cm__bar { height: 2px; border-radius: 2px; background: var(--nh-divider); overflow: hidden; }
.plt-cm__bar i { display: block; height: 100%; width: 0; background: var(--nh-accent); transition: width 500ms var(--nh-ease-out); }
.plt-cm__plan { margin: 4px 0 0; padding-left: 1.4em; display: grid; gap: 6px; font-size: var(--nh-fs-sm); line-height: 1.5; min-height: 0; }
.plt-cm__plan li::marker { color: var(--nh-accent); font-variant-numeric: tabular-nums; }
.plt-cm__plan li.is-typing::after { content: ""; display: inline-block; width: 2px; height: 1em; margin-left: 2px; vertical-align: -0.15em; background: var(--nh-accent); animation: plt-caret 0.8s steps(2) infinite; }
@keyframes plt-caret { 50% { opacity: 0; } }

/* ------------------------------------------------------------------ rail */
.plt-rail { display: none; }

/* ================================================================== desktop stage */
@media (min-width: 1000px) {
  .plt-story { display: grid; grid-template-columns: minmax(0, 1fr); }
  .plt-stage, .plt-steps, .plt-rail { grid-area: 1 / 1; }

  .plt-stage {
    position: sticky; top: 0; align-self: start;
    height: 100vh; height: 100svh;
    overflow: hidden; z-index: 0;
  }
  .plt-shot {
    position: absolute; inset: 0;
    /* the concentric language: each chapter opens as a widening circle */
    clip-path: circle(0% at 68% 50%);
    transition: clip-path var(--plt-dur) var(--plt-ease);
  }
  .plt-shot.is-active, .plt-shot.is-past { clip-path: circle(150% at 68% 50%); }
  .plt-frame--stage { position: absolute; inset: 0 0 0 26%; }
  .plt-shot .plt-frame--stage > video, .plt-shot .plt-frame--stage > img { transform: scale(1.12); transition: transform 2.4s var(--plt-ease), opacity var(--nh-dur-slower) ease-out; }
  .plt-shot.is-active .plt-frame--stage > video, .plt-shot.is-active .plt-frame--stage > img { transform: scale(1.02); }
  .plt-frame--stage > video.nh-grade { filter: saturate(0.82) contrast(1.06) brightness(0.86); }
  /* the ken burns push-in from cinema.css runs on top of our settle only while active */
  .plt-shot:not(.is-active) .nh-kenburns > video { animation-play-state: paused; }

  .plt-shot .plt-vig { right: calc(max(var(--nh-gutter), calc((100vw - var(--nh-container-wide)) / 2 + var(--nh-gutter))) + 0px); bottom: 104px; width: clamp(280px, 24vw, 380px); opacity: 0; transform: translateY(calc(24px * var(--nh-move, 1))); transition: opacity 700ms var(--nh-ease-out) 300ms, transform 900ms var(--nh-ease-out) 300ms; }
  .plt-shot.is-active .plt-vig { opacity: 1; transform: none; }

  .plt-scrim {
    position: absolute; inset: 0; z-index: 6; pointer-events: none;
    background:
      linear-gradient(90deg, var(--nh-bg) 0%, var(--nh-bg) 28%, color-mix(in srgb, var(--nh-bg) 72%, transparent) 40%, color-mix(in srgb, var(--nh-bg) 25%, transparent) 52%, transparent 64%),
      linear-gradient(180deg, var(--nh-bg) 0%, transparent 16%, transparent 84%, var(--nh-bg) 100%);
  }

  .plt-steps { padding-left: max(var(--nh-gutter), calc((100vw - var(--nh-container-wide)) / 2 + var(--nh-gutter))); width: min(46rem, 50vw); }
  .plt-step { min-height: 100vh; min-height: 100svh; display: flex; align-items: center; padding-block: calc(var(--nh-nav-h, 64px) + 4vh) 96px; }
  .plt-step__card { max-width: 34rem; }
  .plt-step__media { display: none; }

  /* chapter menu: one solid plate docked at the bottom of the stage, in the band the stage already fades out;
     counter ring, every chapter by number and name, and the pause button all live inside it */
  .plt-rail {
    display: flex; align-items: flex-end; justify-content: center;
    position: sticky; top: 0; align-self: start;
    height: 100vh; height: 100svh; z-index: 7;
    padding: 0 var(--nh-gutter) 20px;
    pointer-events: none;
  }
  .plt-rail__plate {
    pointer-events: auto;
    display: flex; align-items: center; gap: 6px;
    max-width: 100%;
    padding: 6px 6px 6px 8px;
    border-radius: var(--nh-radius-pill);
    background: var(--nh-surface);
    border: 1px solid var(--nh-border-strong);
    box-shadow: var(--nh-shadow-3);
    color: var(--nh-text);
  }
  .plt-rail__ring { position: relative; flex: none; width: 44px; height: 44px; color: var(--nh-accent); }
  .plt-rail__ring svg { display: block; }
  .plt-rail__track { fill: none; stroke: currentColor; stroke-opacity: 0.22; stroke-width: 3; }
  .plt-rail__fill { fill: none; stroke: currentColor; stroke-width: 3; stroke-linecap: round; transition: stroke-dashoffset var(--nh-dur-slower) var(--nh-ease-out); }
  .plt-rail__num { position: absolute; inset: 0; display: grid; place-items: center; font-family: var(--nh-font-display); font-size: 13px; font-weight: var(--nh-weight-semibold); font-variant-numeric: tabular-nums; color: var(--nh-text); }
  .plt-rail__list { list-style: none; margin: 0; padding: 0; display: flex; gap: 2px; min-width: 0; }
  .plt-rail__btn {
    display: inline-flex; align-items: center; gap: 7px;
    min-height: var(--nh-tap); padding: 0 12px;
    border: 0; border-radius: var(--nh-radius-pill);
    background: transparent; color: var(--nh-text-muted);
    font: inherit; font-size: 14px; white-space: nowrap; cursor: pointer;
    transition: background-color var(--nh-dur-fast), color var(--nh-dur-fast);
  }
  .plt-rail__no { font-size: 11.5px; font-variant-numeric: tabular-nums; letter-spacing: 0.04em; color: var(--nh-text-subtle); }
  .plt-rail__btn.is-past { color: var(--nh-text); }
  .plt-rail__btn:hover { background: var(--nh-accent-soft); color: var(--nh-text); }
  .plt-rail__btn[aria-current] { background: var(--nh-btn-primary-bg); color: var(--nh-btn-primary-text); font-weight: var(--nh-weight-medium); }
  .plt-rail__btn[aria-current] .plt-rail__no { color: inherit; opacity: 0.75; }
  .plt-rail__btn:focus-visible { border-radius: var(--nh-radius-pill); }
  .plt-motion--rail {
    flex: none; width: var(--nh-tap); height: var(--nh-tap); min-height: 0; margin: 0 0 0 4px; padding: 0; justify-content: center;
    border: 1px solid var(--nh-border-strong); background: transparent; color: var(--nh-text);
  }
  .plt-motion--rail .plt-ico { width: 18px; height: 18px; }
  .plt-motion--rail:hover { border-color: var(--nh-text); color: var(--nh-text); }
  /* the rail is visible only while the story is on screen */
  .plt-rail { opacity: 0; visibility: hidden; transition: opacity var(--nh-dur-slow), visibility 0s linear var(--nh-dur-slow); }
  .plt-story.is-onscreen .plt-rail { opacity: 1; visibility: visible; transition: opacity var(--nh-dur-slow), visibility 0s; }
  .plt-intro .plt-motion { display: none; }
}

/* very wide screens: the picture keeps its framing, the words stay close */
@media (min-width: 1800px) {
  .plt-frame--stage { inset: 0 0 0 30%; }
}

/* ================================================================== phone + tablet: stacked chapters */
@media (max-width: 999.98px) {
  .plt-stage { display: none; }
  .plt-steps { display: grid; gap: var(--nh-space-9); padding: 0 var(--nh-gutter); }
  .plt-step__media {
    position: relative;
    margin: 0 calc(var(--nh-gutter) * -0.5) var(--nh-space-6);
    border-radius: var(--nh-radius-lg);
    overflow: hidden;
    aspect-ratio: 4 / 3;
    box-shadow: var(--nh-shadow-3);
  }
  .plt-frame--step { position: absolute; inset: 0; }
  .plt-step__media .plt-vig { left: 12px; right: 12px; bottom: 12px; max-width: 360px; }
  .plt-step__media .plt-ui { font-size: 13px; padding: 12px 14px; }
  .plt-step__media .plt-ui--tiles .plt-tile { min-height: 72px; }
  .plt-step__media .plt-ui--timeline .plt-msg:nth-of-type(2) { display: none; }
  .plt-step__media .plt-ui--report .plt-line:nth-of-type(2) { display: none; }
  .plt-step__media .plt-ui--choice .plt-opt:nth-of-type(2) { display: none; }
  .plt-step__title { max-width: 18ch; }
  .plt-intro { padding-bottom: var(--nh-space-7); }
}
@media (min-width: 640px) and (max-width: 999.98px) {
  .plt-step__media { aspect-ratio: 16 / 9; margin-inline: 0; }
}
@media (max-width: 420px) {
  .plt-step__media { aspect-ratio: 4 / 5; }
  .plt-cm { padding: var(--nh-space-4); }
}

/* ================================================================== more in the box */
.plt-more { padding-top: var(--nh-section-y); }
.plt-more__head {
  display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: var(--nh-space-4) var(--nh-space-5);
  max-width: var(--nh-container-wide); margin: 0 auto var(--nh-space-6);
  padding: 0 var(--nh-gutter);
}
.plt-more__title {
  margin: 0;
  font-family: var(--nh-font-display); font-size: var(--nh-fs-2xl); font-weight: var(--nh-weight-medium);
  line-height: var(--nh-lh-heading); letter-spacing: var(--nh-tracking-heading); color: var(--nh-heading);
}
.plt-more__lede { margin: 8px 0 0; color: var(--nh-text-muted); font-size: var(--nh-fs-base); }
.plt-more__nav { display: flex; gap: 10px; flex: none; }
.plt-round {
  display: grid; place-items: center;
  width: 48px; height: 48px; border-radius: 50%;
  border: 1px solid var(--nh-border-strong); background: var(--nh-btn-secondary-bg); color: var(--nh-text);
  cursor: pointer; transition: border-color var(--nh-dur-fast), background-color var(--nh-dur-fast), opacity var(--nh-dur-fast);
}
.plt-round:hover { border-color: var(--nh-text); }
.plt-round[aria-disabled="true"] { opacity: 0.4; cursor: default; }
.plt-round:focus-visible { border-radius: 50%; }

.plt-row {
  list-style: none; margin: 0; padding: 12px max(var(--nh-gutter), calc((100vw - var(--nh-container-wide)) / 2 + var(--nh-gutter))) 28px;
  display: flex; gap: clamp(12px, 1.4vw, 20px);
  overflow-x: auto; overscroll-behavior-x: contain;
  scroll-snap-type: x mandatory;
  scroll-padding-inline: max(var(--nh-gutter), calc((100vw - var(--nh-container-wide)) / 2 + var(--nh-gutter)));
  scrollbar-width: none;
}
.plt-row::-webkit-scrollbar { display: none; }
.plt-card { flex: 0 0 clamp(248px, 24vw, 340px); scroll-snap-align: start; }
.plt-card__link {
  position: relative; display: block; overflow: hidden;
  aspect-ratio: 3 / 4;
  border-radius: var(--nh-radius-lg);
  color: #fff; text-decoration: none;
  background: var(--nh-p-ink-900, #0c1211);
  box-shadow: var(--nh-shadow-2);
  transform: translateZ(0);
  transition: transform var(--nh-dur-slow) var(--nh-ease-out), box-shadow var(--nh-dur-slow) var(--nh-ease-out);
}
.plt-card__link:focus-visible { border-radius: var(--nh-radius-lg); outline-offset: 4px; }
.plt-frame--card { position: absolute; inset: 0; }
.plt-frame--card > video { filter: saturate(0.75) brightness(0.8); transition: filter var(--nh-dur-slower) ease-out, opacity var(--nh-dur-slower) ease-out, transform 1.6s var(--nh-ease-out); transform: scale(1.04); }
.plt-card.is-hot .plt-frame--card > video { filter: none; transform: scale(1); }
.plt-card__link::after {
  content: ""; position: absolute; inset: 0; z-index: 4; pointer-events: none;
  background: linear-gradient(180deg, rgba(5, 8, 8, 0) 30%, rgba(5, 8, 8, 0.55) 58%, rgba(5, 8, 8, 0.94) 100%);
}
.plt-card__body { position: absolute; left: 0; right: 0; bottom: 0; z-index: 5; display: grid; gap: 8px; padding: 22px; }
.plt-card__ico { display: grid; place-items: center; width: 40px; height: 40px; border-radius: 50%; border: 1px solid rgba(255, 255, 255, 0.55); color: #fff; margin-bottom: 4px; transition: background-color var(--nh-dur-base), border-color var(--nh-dur-base), color var(--nh-dur-base); }
.plt-card__ico .plt-ico { width: 20px; height: 20px; }
.plt-card__name { font-family: var(--nh-font-display); font-size: var(--nh-fs-xl); font-weight: var(--nh-weight-medium); line-height: 1.15; }
.plt-card__text { font-size: var(--nh-fs-sm); line-height: 1.5; color: rgba(255, 255, 255, 0.86); }
@media (hover: hover) and (pointer: fine) {
  .plt-card.is-hot .plt-card__link { transform: translateY(calc(-6px * var(--nh-move, 1))) scale(calc(1 + 0.02 * var(--nh-move, 1))); box-shadow: var(--nh-shadow-4), var(--nh-shadow-glow); }
}
.plt-card.is-hot .plt-card__ico { background: var(--nh-p-teal-300, #62d6cd); border-color: var(--nh-p-teal-300, #62d6cd); color: var(--nh-p-teal-950, #021312); }

/* ------------------------------------------------------------------ closing door */
.plt-door { display: grid; justify-items: center; gap: var(--nh-space-4); padding: var(--nh-space-8) var(--nh-gutter) var(--nh-section-y); text-align: center; }
.plt-door__sub { margin: 0; color: var(--nh-text-muted); font-size: var(--nh-fs-sm); }
.plt-door__sub a { color: var(--nh-accent); display: inline-block; padding: 12px 4px; }
.plt-btn .plt-ico { transition: transform var(--nh-dur-base) var(--nh-ease-out); }
.plt-btn:hover .plt-ico { transform: translateX(calc(3px * var(--nh-move, 1))); }

/* ------------------------------------------------------------------ motion off (button or OS setting) */
.plt[data-motion="off"] .plt-wave i,
.plt[data-motion="off"] .plt-cursor,
.plt[data-motion="off"] .plt-cm__plan li.is-typing::after,
.plt[data-motion="off"] .nh-kenburns > video,
.plt[data-motion="off"] .nh-grain::after { animation: none; }

@media (prefers-reduced-motion: reduce) {
  .plt-shot { transition: opacity 500ms ease-out; clip-path: none !important; opacity: 0; }
  .plt-shot.is-active { opacity: 1; }
  .plt-shot .plt-frame--stage > video, .plt-shot .plt-frame--stage > img { transform: none !important; }
  .plt-wave i, .plt-cursor, .plt-cm__plan li.is-typing::after { animation: none; }
  .plt-js .plt-step:not(.is-in) .plt-step__card > * { transform: none; }
  .plt-card__link, .plt-frame--card > video { transition: none; transform: none !important; }
}

/* ------------------------------------------------------------------ Windows high contrast */
@media (forced-colors: active) {
  .plt-ui, .plt-cm, .plt-card__link { border: 1px solid CanvasText; }
  .plt-rail__plate { border: 1px solid CanvasText; }
  .plt-rail__btn[aria-current] { outline: 2px solid Highlight; }
}

/* ------------------------------------------------------------------ fix round (QA F6, F10) */
/* phone: the pause control is a quiet round icon button, not the loudest thing under the intro */
.plt-intro .plt-motion {
  width: var(--nh-tap); height: var(--nh-tap); min-height: 0; padding: 0; justify-content: center;
  border-color: var(--nh-border); color: var(--nh-text-muted); margin-top: var(--nh-space-4);
}
.plt-intro .plt-motion .plt-ico { width: 18px; height: 18px; }

@media (min-width: 1000px) {
  /* the CrewMate chapter must fit a 900 px laptop with the plan typed out */
  .plt-step--play .plt-step__text { margin-top: var(--nh-space-3); }
  .plt-cm { margin-top: var(--nh-space-4); padding: var(--nh-space-4) var(--nh-space-5); }
  .plt-cm__hint, .plt-cm__you { display: none !important; }
  .plt-cm__head { margin-bottom: 12px; }
  .plt-cm { max-width: 37rem; }
  .plt-cm__jobs { flex-wrap: nowrap; gap: 6px; }
  .plt-cm__job { min-height: var(--nh-tap); padding: 0 12px; font-size: 13.5px; white-space: nowrap; }
  .plt-cm__chat { margin-top: 12px; }
  .plt-cm__chat.is-open { gap: 8px; }
  .plt-cm__plan { gap: 3px; font-size: 14px; line-height: 1.45; }
}
/* a laptop-height screen: the chapter (eyebrow, title, text, points, link) fits above the fold */
@media (min-width: 1000px) and (max-height: 960px) {
  .plt-step { padding-block: calc(var(--nh-nav-h, 64px) + 1vh) 84px; }
  .plt-step__title { font-size: clamp(2rem, 1rem + 3.6vh, 2.75rem); }
  .plt-step__kicker { margin-bottom: var(--nh-space-3); }
  .plt-step__text { font-size: 1.0625rem; margin-top: var(--nh-space-3); }
  .plt-step__proof { margin-top: var(--nh-space-3); gap: 4px; }
  .plt-step__proof li:nth-child(3) { display: none; }
  .plt-link { margin-top: var(--nh-space-2); }
}

@media (min-width: 1000px) and (max-width: 1279.98px) {
  .plt-cm__jobs { flex-wrap: wrap; }
}

/* narrower desktops: the numbers stay, only the current chapter keeps its name */
@media (min-width: 1000px) and (max-width: 1279.98px) {
  .plt-rail__btn:not([aria-current]) .plt-rail__name { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
  .plt-rail__btn { padding: 0 10px; }
}