/* Partner layout and component rules. The shared Risograph skin loaded
   after this file owns screen colors, typography, and opening composition. */
:root {
  --ink: #0b0b0c;
  --paper: #f2f2f0;
  --paper-72: color-mix(in srgb, var(--paper) 72%, transparent);
  --paper-56: color-mix(in srgb, var(--paper) 56%, transparent);
  --paper-42: color-mix(in srgb, var(--paper) 42%, transparent);
  --paper-28: color-mix(in srgb, var(--paper) 28%, transparent);
  --line: color-mix(in srgb, var(--paper) 11%, transparent);
  --line-strong: color-mix(in srgb, var(--paper) 22%, transparent);
  --caption: #e0bd6d;
  --mono: ui-monospace, SFMono-Regular, Menlo, monospace;

  --gutter-x: clamp(48px, 6.4vw, 116px);
  --gutter-y: clamp(42px, 5.2vh, 72px);
  --step: clamp(18px, 2.8vh, 40px);
  --fs-display: clamp(50px, 5.7vw, 90px);
  --fs-h2: clamp(36px, 3.55vw, 56px);
  --fs-h3: clamp(19px, 1.75vw, 27px);
  --fs-lede: clamp(15px, 1.15vw, 19px);
  --fs-body: clamp(12px, .95vw, 15px);
  --fs-label: clamp(11px, .8vw, 13px);
  --fs-mono: clamp(10px, .68vw, 12px);
  --fs-metric-xl: clamp(62px, 8.8vw, 136px);
  --fs-metric-result: clamp(50px, 6vw, 92px);
  --fs-metric-m: clamp(24px, 2.4vw, 37px);
}

* { box-sizing: border-box; }
html {
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
  background: var(--ink);
}
body {
  width: 100%;
  max-width: 100%;
  margin: 0;
  overflow: hidden;
  background: var(--ink);
  color: var(--paper);
  font-family: "Helvetica Neue", "Aptos", "Segoe UI Variable", -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  font-variant-numeric: lining-nums;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
button, a { color: inherit; font: inherit; }
button { cursor: pointer; }
a { text-decoration: none; }

.deck {
  position: relative;
  width: 100%;
  max-width: 100vw;
  height: 100dvh;
  overflow-x: hidden;
  overflow-y: auto;
  scroll-snap-type: y mandatory;
  scroll-behavior: smooth;
  background: var(--ink);
  scrollbar-width: none;
}
.deck::-webkit-scrollbar { width: 0; height: 0; }

/* Presenter chrome stays quiet: type only, no borders, no plates. */
.deck-controls { position: fixed; z-index: 100; top: 22px; right: var(--gutter-x); display: flex; align-items: center; gap: clamp(14px, 1.4vw, 22px); }
.control {
  border: 0; background: none; padding: 2px 0; color: var(--paper-28);
  font-family: var(--mono); font-size: var(--fs-mono); letter-spacing: .14em;
  text-transform: uppercase; transition: color 180ms ease;
}
.control:hover, .control:focus-visible { color: var(--paper); outline: none; }
#language-control {
  display: grid;
  min-width: 48px;
  min-height: 32px;
  place-items: center;
  padding: 0 14px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: color-mix(in srgb, var(--ink) 66%, transparent);
  box-shadow: inset 0 1px 0 color-mix(in srgb, var(--paper) 8%, transparent);
  color: var(--paper-72);
  font-weight: 600;
  letter-spacing: .08em;
}
#language-control:hover, #language-control:focus-visible {
  border-color: color-mix(in srgb, var(--caption) 54%, transparent);
  color: var(--caption);
}
.rail { position: fixed; z-index: 95; left: 0; top: 50%; display: flex; flex-direction: column; gap: 5px; padding: 18px 26px 18px 22px; opacity: 0; transform: translateY(-50%); transition: opacity 240ms ease; }
.rail:hover, .rail:focus-within { opacity: 1; }
.rail button { display: flex; align-items: center; width: 30px; height: 14px; border: 0; background: transparent; padding: 0; }
.rail button::before { content: ""; width: 9px; height: 1px; background: var(--paper-28); transition: width 180ms ease, background 180ms ease; }
.rail button:hover::before, .rail button.active::before { width: 26px; background: var(--paper); }
.progress { position: fixed; z-index: 100; bottom: 0; left: 0; width: 100%; height: 1px; background: color-mix(in srgb, var(--paper) 6%, transparent); }
.progress div { height: 100%; background: var(--paper-28); transition: width 420ms cubic-bezier(.2,.8,.2,1); }
.slide-count { position: fixed; z-index: 96; bottom: 20px; left: var(--gutter-x); display: flex; align-items: baseline; gap: 5px; font-family: var(--mono); color: var(--paper-28); font-size: var(--fs-mono); letter-spacing: .06em; }
.slide-count span:first-child { color: var(--paper-72); }

/* Shared slide frame: head, a body that fills, then the source line. */
.slide { position: relative; width: 100%; max-width: 100vw; min-height: 100dvh; overflow: hidden; scroll-snap-align: start; scroll-snap-stop: always; isolation: isolate; }
.slide-frame {
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  gap: var(--step);
  width: min(100%, 1520px);
  min-height: 100dvh;
  margin: 0 auto;
  padding: var(--gutter-y) var(--gutter-x) calc(var(--gutter-y) + 12px);
}
.slide-head { align-self: start; }
.slide-body { display: grid; grid-template-rows: auto; align-self: center; min-height: 0; width: 100%; }
:is(.problem-slide, .solution-slide, .glasses-slide, .connect-slide) .slide-body { grid-template-rows: minmax(0, 1fr); align-self: stretch; }
:is(.proof-slide, .market-slide, .partnership-slide) .slide-body { padding-bottom: clamp(14px, 3.6vh, 50px); }
.market-slide .slide-body { grid-template-rows: minmax(0, 1fr); align-self: stretch; }
.slide-body > * { min-height: 0; }
.slide-foot { align-self: end; display: flex; align-items: flex-end; justify-content: space-between; gap: 40px; min-height: 14px; }
.logo-mark { position: absolute; z-index: 10; right: var(--gutter-x); bottom: 20px; display: flex; align-items: center; gap: 8px; color: var(--paper-28); font-size: var(--fs-label); font-weight: 600; letter-spacing: .02em; transition: color 180ms ease; }
.logo-mark img { width: 17px; height: 17px; border-radius: 4px; filter: grayscale(1); opacity: .7; }
.logo-mark:hover { color: var(--paper-56); }
.slide h2 { max-width: 24ch; margin: 0; font-size: var(--fs-h2); font-weight: 550; letter-spacing: -.032em; line-height: 1.06; text-wrap: balance; }
.slide h2 span { display: block; color: var(--caption); }
.source-link { color: var(--paper-28); font-family: var(--mono); font-size: var(--fs-mono); letter-spacing: .04em; text-decoration: underline; text-decoration-color: var(--line-strong); text-underline-offset: 4px; transition: color 180ms ease; }
.source-link:hover { color: var(--paper-72); }
.slide-source { display: flex; flex-wrap: wrap; gap: 8px 22px; }
.slide-note { color: var(--paper-28); font-family: var(--mono); font-size: var(--fs-mono); letter-spacing: .1em; text-transform: uppercase; }

html[lang="zh-CN"] .slide h2 { max-width: 16em; font-size: clamp(31px, 3.15vw, 49px); letter-spacing: -.005em; line-height: 1.22; }
html[lang="zh-CN"] .opening-copy h1 { max-width: 14em; font-size: clamp(44px, 4.9vw, 78px); letter-spacing: 0; line-height: 1.2; }
html[lang="zh-CN"] .slide h3 { letter-spacing: 0; }

/* Motion: one soft rise per band, then a short cascade inside the body. */
.reveal { opacity: 0; transform: translateY(18px); }
.slide.is-visible .reveal { animation: reveal 620ms cubic-bezier(.17,.75,.22,1) forwards; }
.slide.is-visible .slide-body.reveal { animation-delay: 110ms; }
.slide.is-visible .slide-foot.reveal { animation-delay: 200ms; }
@keyframes reveal { to { opacity: 1; transform: translateY(0); } }
.pain-grid > article,
.technology-arc > article,
.connect-links > a { opacity: 0; transform: translateY(12px); }
.slide.is-visible :is(.pain-grid, .technology-arc, .connect-links) > * { animation: reveal 520ms cubic-bezier(.17,.75,.22,1) forwards; animation-delay: 220ms; }
.slide.is-visible :is(.pain-grid, .technology-arc, .connect-links) > :nth-child(2) { animation-delay: 310ms; }
.slide.is-visible :is(.pain-grid, .technology-arc, .connect-links) > :nth-child(3) { animation-delay: 400ms; }
.slide.is-visible .connect-links > :nth-child(4) { animation-delay: 490ms; }

/* 01 opening */
.opening-visual { position: absolute; z-index: -1; inset: 0; overflow: hidden; }
.opening-visual video { width: 100%; height: 100%; object-fit: cover; object-position: center; filter: saturate(.92) contrast(1.04) brightness(.9); transform: scale(1.025); }
.opening-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 78% at 50% 34%, transparent 48%, color-mix(in srgb, var(--ink) 42%, transparent) 100%),
    linear-gradient(0deg, var(--ink) 3%, color-mix(in srgb, var(--ink) 76%, transparent) 38%, color-mix(in srgb, var(--ink) 28%, transparent) 72%, color-mix(in srgb, var(--ink) 8%, transparent) 100%);
}
.opening-slide .slide-body { align-self: end; grid-template-rows: auto; }
.opening-copy { display: grid; gap: clamp(14px, 2vh, 24px); }
.opening-kicker { margin: 0; color: var(--paper-56); font-family: var(--mono); font-size: var(--fs-mono); letter-spacing: .14em; text-transform: uppercase; }
.opening-copy h1 { max-width: 18ch; margin: 0; font-size: var(--fs-display); font-weight: 550; letter-spacing: -.038em; line-height: 1.02; text-wrap: balance; }
.opening-line { display: block; color: var(--paper); }
.opening-line.opening-accent { color: var(--caption); }
.opening-kicker, .opening-line { opacity: 0; transform: translateY(28px); }
.opening-slide.is-visible .opening-kicker { animation: reveal 640ms cubic-bezier(.16,1,.3,1) 220ms forwards; }
.opening-slide.is-visible .opening-line { animation: reveal 760ms cubic-bezier(.16,1,.3,1) 340ms forwards; }
.opening-slide.is-visible .opening-accent { animation-delay: 470ms; }
@keyframes openingDrift { 0% { transform: scale(1.025) translate3d(0, 0, 0); } 50% { transform: scale(1.065) translate3d(-.6%, -.4%, 0); } 100% { transform: scale(1.025) translate3d(0, 0, 0); } }
@media (prefers-reduced-motion: no-preference) { .opening-visual video { animation: openingDrift 18s ease-in-out infinite; } }

/* 02 problem */
.problem-body { display: grid; grid-template-rows: minmax(0, 1fr) auto; gap: clamp(18px, 2.5vh, 30px); min-height: 0; }
.problem-figure { position: relative; overflow: hidden; width: 100%; min-height: 0; margin: 0; border: 1px solid var(--line); background: #070708; }
.problem-figure img { position: absolute; inset: 0; display: block; width: 100%; height: 100%; object-fit: cover; object-position: center 46%; filter: saturate(.72) brightness(.7); transform-origin: center 34%; transition: transform 1.2s cubic-bezier(.16,1,.3,1); }
.problem-slide.is-visible .problem-figure img { transform: scale(1.18); }
.problem-figure::after { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, color-mix(in srgb, var(--ink) 62%, transparent), transparent 55%); }
.foreign-caption { position: absolute; z-index: 2; left: 50%; bottom: 37%; display: grid; justify-items: center; gap: 9px; transform: translateX(-50%); padding: 9px 16px; background: color-mix(in srgb, #050506 76%, transparent); color: #f7f7f5; line-height: 1.2; white-space: nowrap; text-shadow: 0 1px 3px #050506; }
.foreign-caption strong { font-size: clamp(17px, 1.8vw, 27px); font-weight: 560; }
.foreign-caption span { color: var(--caption); font-size: clamp(12px, .88vw, 14px); font-weight: 500; letter-spacing: .03em; }
.pain-grid { display: grid; grid-template-columns: minmax(210px, .72fr) repeat(2, minmax(0, 1.14fr)); gap: clamp(18px, 2.4vw, 34px); padding-top: 13px; border-top: 1px solid var(--line-strong); }
.pain-grid > article { display: grid; grid-template-columns: 70px minmax(0, 1fr); gap: clamp(12px, 1.4vw, 20px); align-items: center; min-width: 0; }
.pain-grid > article > div:last-child { display: grid; gap: 4px; min-width: 0; }
.pain-grid > article.language-pain { align-items: start; }
.pain-grid > article.caption-pain { grid-template-columns: 108px minmax(0, 1fr); align-items: start; gap: 16px; }
.pain-symbol { position: relative; display: grid; place-items: center; width: 64px; height: 54px; color: var(--paper-56); }
.language-symbol { grid-template-columns: auto auto auto; gap: 5px; color: var(--paper-72); font-family: var(--mono); }
.language-symbol b { color: inherit; font-size: 20px; font-weight: 550; }
.language-symbol i { color: var(--caption); font-size: 18px; font-style: normal; }
.image-symbol { overflow: hidden; border: 1px solid var(--line-strong); background: #080809; }
.image-symbol img { display: block; width: 100%; height: 100%; object-fit: cover; filter: saturate(.82) contrast(1.04) brightness(.84); }
.caption-pain .image-symbol { width: 108px; height: 91px; }
.pain-grid strong { color: var(--paper); font-size: clamp(16px, 1.2vw, 19px); font-weight: 540; line-height: 1.18; }
.pain-grid p { margin: 0; color: var(--paper-56); font-size: clamp(13px, .9vw, 14px); line-height: 1.42; }
.pain-points { display: grid; gap: 2px; margin: 0; padding: 0; list-style: none; }
.pain-points li { position: relative; padding-left: 10px; color: var(--paper-56); font-size: clamp(11px, .78vw, 12.5px); line-height: 1.35; }
.pain-points li::before { content: ""; position: absolute; left: 0; top: .58em; width: 3px; height: 3px; background: var(--caption); }
.pain-source { justify-self: start; color: var(--paper-42); font-family: var(--mono); font-size: clamp(9px, .68vw, 11px); line-height: 1.3; text-decoration: underline; text-decoration-color: var(--line-strong); text-underline-offset: 3px; }
.pain-source:hover { color: var(--caption); }

/* 03 solution */
.solution-body { display: grid; grid-template-columns: minmax(190px, .6fr) 1.4fr; gap: clamp(32px, 5vw, 82px); align-items: stretch; }
.product-figure { display: grid; grid-template-rows: minmax(0, 1fr) auto; gap: 12px; margin: 0; }
.product-plate { position: relative; overflow: hidden; width: 100%; min-height: 0; border: 1px solid var(--line); background: #050506; }
.product-plate img { position: absolute; inset: 0; display: block; width: 100%; height: 100%; object-fit: cover; }
.product-figure figcaption { max-width: 34ch; color: var(--paper-42); font-size: var(--fs-label); line-height: 1.45; }
.solution-evidence { display: grid; align-content: center; gap: clamp(12px, 2vh, 24px); }
.hero-metric { display: grid; grid-template-columns: auto minmax(0, 1fr); align-items: baseline; column-gap: clamp(16px, 1.8vw, 28px); }
.hero-metric strong { grid-column: 1 / -1; color: var(--caption); font-size: var(--fs-metric-xl); font-weight: 540; letter-spacing: -.055em; line-height: .82; }
.user-count { font-variant-numeric: tabular-nums; }
.hero-metric span { margin-top: 12px; color: var(--paper); font-size: var(--fs-lede); font-weight: 520; }
.hero-metric > b { margin-top: 12px; color: var(--paper-42); font-family: var(--mono); font-size: var(--fs-mono); font-weight: 400; letter-spacing: .08em; }
.feedback-section { border-top: 1px solid var(--line-strong); padding-top: 12px; }
.feedback-heading { display: flex; align-items: flex-start; justify-content: flex-start; }
.feedback-heading > a { color: var(--paper); font-size: var(--fs-lede); font-weight: 560; }
.feedback-heading > a:hover { color: var(--caption); }
.feedback-wall { position: relative; display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); min-height: clamp(194px, 27vh, 230px); margin-top: 10px; perspective: 900px; }
/* Stable grid cells own hit testing; wider inert surfaces keep the overlapping fan. */
.feedback-card { --turn: 0deg; --lift: 0px; --deal-delay: 0ms; --z: 1; position: relative; z-index: var(--z); display: block; min-width: 0; height: clamp(116px, 11.6vw, 160px); margin-top: var(--lift); color: inherit; opacity: 0; cursor: pointer; }
.solution-slide.is-visible .feedback-card { animation: feedbackDeal 420ms cubic-bezier(.16,1,.3,1) var(--deal-delay) forwards; }
@keyframes feedbackDeal { from { opacity: 0; transform: translateY(32px) scale(.96); } to { opacity: 1; transform: none; } }
.feedback-card:nth-of-type(1) { --lift: 28px; --turn: -8deg; --z: 1; --deal-delay: 180ms; }
.feedback-card:nth-of-type(2) { --lift: 14px; --turn: -5deg; --z: 2; --deal-delay: 230ms; }
.feedback-card:nth-of-type(3) { --lift: 4px; --turn: -2deg; --z: 3; --deal-delay: 280ms; }
.feedback-card:nth-of-type(4) { --turn: 1deg; --z: 4; --deal-delay: 330ms; }
.feedback-card:nth-of-type(5) { --lift: 4px; --turn: 4deg; --z: 5; --deal-delay: 380ms; }
.feedback-card:nth-of-type(6) { --lift: 14px; --turn: 7deg; --z: 6; --deal-delay: 430ms; }
.feedback-card:nth-of-type(7) { --lift: 28px; --turn: 10deg; --z: 7; --deal-delay: 480ms; }
.feedback-card-surface { position: absolute; top: 0; left: 50%; display: flex; flex-direction: column; width: clamp(116px, 11.6vw, 160px); aspect-ratio: 1; padding: clamp(11px, 1.1vw, 15px); border: 1px solid var(--line-strong); background: #111113; transform: translateX(-50%) rotate(var(--turn)); transform-origin: 50% 100%; transition: opacity 180ms ease, transform 240ms cubic-bezier(.16,1,.3,1), border-color 120ms ease, background 120ms ease; pointer-events: none; }
.feedback-card:focus-visible { z-index: 30; outline: none; }
.feedback-card:focus-visible .feedback-card-surface { border-color: var(--caption); background: #181719; outline: 2px solid var(--caption); outline-offset: 2px; transform: translateX(-50%) translateY(-5px) rotate(0) scale(1.14); }
.feedback-wall:has(.feedback-card:focus-visible) .feedback-card:not(:focus-visible) .feedback-card-surface { opacity: .32; transform: translateX(-50%) translateY(7px) rotate(var(--turn)) scale(.965); }
@media (hover: hover) and (pointer: fine) {
  .feedback-card:hover { z-index: 30; }
  .feedback-card:hover .feedback-card-surface { border-color: var(--caption); background: #181719; transform: translateX(-50%) translateY(-5px) rotate(0) scale(1.14); }
  .feedback-wall:has(.feedback-card:hover) .feedback-card:not(:hover) .feedback-card-surface { opacity: .32; transform: translateX(-50%) translateY(7px) rotate(var(--turn)) scale(.965); }
}
.feedback-card p { display: -webkit-box; min-height: 4.05em; margin: 0; overflow: hidden; color: var(--paper); font-size: clamp(10px, .76vw, 12.5px); font-weight: 560; line-height: 1.35; -webkit-box-orient: vertical; -webkit-line-clamp: 3; }
.feedback-card footer { display: grid; gap: 5px; margin-top: auto; color: var(--paper-42); font-family: var(--mono); font-size: clamp(6px, .45vw, 8px); line-height: 1.25; }
.feedback-card footer > span { overflow: hidden; text-overflow: clip; white-space: nowrap; }
.feedback-author { display: block; }
.feedback-metrics { display: flex; align-items: center; gap: 6px; }
.feedback-metrics > span { display: inline-flex; align-items: center; gap: 2px; }
.feedback-metrics svg { width: 8px; height: 8px; fill: none; stroke: currentColor; stroke-linecap: round; stroke-linejoin: round; stroke-width: 1.7; }
.feedback-metrics b { color: var(--paper-56); font-weight: 500; }

/* 04 glasses */
.glasses-body { display: grid; grid-template-rows: minmax(0, 1fr) auto; gap: var(--step); min-height: 0; }
.experience-stage { display: grid; grid-template-columns: .8fr 46px 1.2fr; min-height: 0; }
.experience-panel { display: grid; gap: clamp(14px, 1.5vw, 22px); min-height: 0; padding: clamp(12px, 1.25vw, 18px); border: 1px solid var(--line); background: #0f0f11; opacity: 0; }
.phone-experience { grid-template-rows: auto minmax(0, 1fr); transform: translateX(-28px); }
.glasses-experience { grid-template-rows: minmax(145px, 1fr) auto; transform: translateX(28px); }
.glasses-slide.is-visible .experience-panel { animation: experienceIn 720ms cubic-bezier(.16,1,.3,1) 260ms forwards; }
.glasses-slide.is-visible .glasses-experience { animation-delay: 430ms; }
@keyframes experienceIn { to { opacity: 1; transform: translateX(0); } }
.experience-panel figure { position: relative; overflow: hidden; min-height: 0; margin: 0; background: #050506; }
.experience-panel figure::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 55%, color-mix(in srgb, var(--ink) 35%, transparent)); pointer-events: none; }
.experience-panel figure > img { position: absolute; inset: 0; display: block; width: 100%; height: 100%; object-fit: cover; transition: transform 900ms cubic-bezier(.16,1,.3,1); }
.glasses-experience figure > img { object-fit: contain; object-position: center; }
.experience-panel:hover figure > img { transform: scale(1.035); }
.even-hud-caption { position: absolute; z-index: 2; top: 64%; left: 50%; color: #9cff6b; font-family: var(--mono); font-size: clamp(9px, .8vw, 13px); font-weight: 560; letter-spacing: .08em; line-height: 1; white-space: nowrap; text-shadow: 0 0 1px currentColor, 0 0 3px rgba(111,255,79,.24); transform: translate(-50%, -50%); opacity: .82; }
.experience-copy { display: grid; align-content: center; gap: clamp(9px, 1.1vh, 14px); }
.experience-copy > span { color: var(--paper-42); font-family: var(--mono); font-size: var(--fs-mono); letter-spacing: .1em; text-transform: uppercase; }
.experience-copy h3 { margin: 0; font-size: clamp(20px, 1.8vw, 28px); font-weight: 530; line-height: 1.12; }
.glasses-experience .experience-copy h3 { color: var(--caption); }
.phone-experience .experience-copy { align-content: end; }
.phone-ledger { display: grid; min-height: 0; border-top: 1px solid var(--line); }
.phone-ledger figure { display: grid; grid-template-columns: auto minmax(0, 1fr); align-items: stretch; height: clamp(92px, 16.9vh, 182px); border-bottom: 1px solid var(--line); }
.phone-ledger figure::after { display: none; }
.phone-ledger figure > img { position: static; width: auto; height: 100%; min-height: 0; aspect-ratio: 256 / 216; object-fit: cover; filter: saturate(.9) contrast(1.04); }
.phone-ledger figcaption { display: grid; align-content: center; gap: 5px; min-width: 0; padding: 10px clamp(10px, 1.1vw, 18px) 10px clamp(14px, 1.35vw, 22px); }
.phone-ledger figcaption b { color: var(--paper); font-size: clamp(13px, 1vw, 16px); font-weight: 530; line-height: 1.2; }
.phone-ledger figcaption small { color: var(--paper-42); font-size: clamp(10px, .85vw, 13px); line-height: 1.45; }
.phone-experience:hover .phone-ledger figure > img { transform: none; }
.flow-transfer { display: grid; place-items: center; overflow: hidden; color: var(--paper-56); }
.flow-transfer svg { display: block; width: 18px; height: 18px; fill: currentColor; opacity: 0; transform: translateX(-8px); }
.glasses-slide.is-visible .experience-transfer svg, .partnership-slide.is-visible .rights-transition svg { animation: transferArrow 480ms cubic-bezier(.16,1,.3,1) 660ms forwards; }
@keyframes transferArrow { to { opacity: 1; transform: translateX(0); } }
.hardware-ribbon { display: grid; grid-template-columns: .7fr 1.3fr; border-top: 1px solid var(--line-strong); opacity: 0; transform: translateY(22px); }
.glasses-slide.is-visible .hardware-ribbon { animation: reveal 660ms cubic-bezier(.16,1,.3,1) 760ms forwards; }
.ideal-brief { display: grid; grid-template-rows: auto minmax(0, 1fr); }
.ideal-brief > span { padding: 8px 10px 7px 0; color: var(--paper-42); font-family: var(--mono); font-size: var(--fs-mono); letter-spacing: .1em; line-height: 1.35; text-transform: uppercase; }
.ideal-stack { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); }
.ideal-stack article { display: grid; align-items: center; min-height: 0; padding: 7px 12px; border-left: 1px solid var(--line); }
.ideal-stack article:first-child { border-left: 0; padding-left: 0; }
.ideal-stack article > div { display: grid; gap: 2px; }
.ideal-brief strong, .ideal-brief small { display: block; }
.ideal-brief strong { font-size: clamp(18px, 1.55vw, 24px); font-weight: 540; letter-spacing: -.035em; line-height: 1; }
.ideal-brief small { color: var(--paper-42); font-size: var(--fs-mono); line-height: 1.25; }
.vendor-state { display: grid; grid-template-columns: repeat(3, 1fr); border-left: 1px solid var(--line-strong); }
.vendor-state article { display: grid; align-content: center; gap: 4px; padding: 10px clamp(10px, 1.15vw, 18px); border-left: 1px solid var(--line); }
.vendor-state article:first-child { border-left: 0; }
.vendor-state article > span, .vendor-status > span { color: var(--paper-42); font-family: var(--mono); font-size: var(--fs-mono); letter-spacing: .07em; }
.vendor-state h3 { margin: 0; font-size: clamp(16px, 1.35vw, 21px); font-weight: 530; }
.vendor-state p { margin: 0; color: var(--paper-42); font-size: var(--fs-mono); line-height: 1.35; }
.vendor-status { display: flex; align-items: baseline; gap: 5px; min-width: 0; }
.vendor-community { display: flex; align-items: baseline; gap: 4px; color: var(--caption); font-family: var(--mono); font-size: clamp(7px, .6vw, 9px); line-height: 1.2; white-space: nowrap; }
.vendor-community i { color: var(--paper-42); font-style: normal; }

/* 05 market today */
.market-story { display: grid; grid-template-columns: minmax(0, 1.62fr) minmax(270px, .88fr); gap: clamp(28px, 4vw, 64px); min-height: 0; }
.market-history { display: grid; grid-template-rows: auto minmax(0, 1fr) auto; gap: clamp(10px, 1.35vh, 15px); min-width: 0; }
.market-future { display: grid; grid-template-rows: auto minmax(0, 1fr); gap: clamp(10px, 1.35vh, 15px); min-width: 0; padding-left: clamp(20px, 2.5vw, 40px); border-left: 1px solid var(--paper-56); }
.story-band { display: grid; gap: 4px; min-width: 0; padding-top: 7px; }
.story-band > span { color: var(--paper-42); font-family: var(--mono); font-size: var(--fs-mono); letter-spacing: .12em; text-transform: uppercase; }
.story-band > b { color: var(--paper-56); font-size: var(--fs-label); font-weight: 520; line-height: 1.3; }
.future-band > span, .future-band > b { color: var(--paper); }
.technology-arc { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: clamp(16px, 2vw, 30px); align-items: stretch; }
.technology-arc article { display: grid; align-content: start; grid-template-rows: minmax(96px, 14vh) auto auto auto auto minmax(0, 1fr); gap: clamp(5px, .75vh, 9px); }
.cinemacc-era { display: grid; align-content: start; grid-template-rows: minmax(164px, 23vh) auto auto auto minmax(0, 1fr); gap: clamp(7px, .95vh, 11px); }
.device-shot { display: grid; place-items: center; overflow: hidden; min-height: 0; margin: 0; background: #ececea; }
.device-shot > img { display: block; width: 100%; height: 100%; object-fit: cover; transition: transform 760ms cubic-bezier(.16,1,.3,1); }
.technology-arc article:hover .device-shot > img, .cinemacc-era:hover .device-shot > img { transform: scale(1.035); }
.technology-arc article:nth-child(2) .device-shot > img { object-fit: contain; object-position: center; }
.cinemacc-era .device-shot > img { object-fit: cover; object-position: center 46%; }
.cinemacc-market-shot { position: relative; }
.market-glasses-caption { position: absolute; top: 64%; left: 50%; color: #9cff6b; font-family: var(--mono); font-size: clamp(8px, .75vw, 12px); font-weight: 560; letter-spacing: .06em; line-height: 1.2; white-space: nowrap; text-shadow: 0 0 1px currentColor, 0 0 3px rgba(111,255,79,.24); transform: translate(-50%, -50%); opacity: .86; pointer-events: none; }
.market-brand { position: absolute; top: 8px; right: 8px; display: flex; align-items: center; gap: 5px; padding: 4px 6px; border-radius: 3px; background: rgba(8,7,6,.72); color: rgba(255,255,255,.88); font-size: clamp(7px, .55vw, 9px); line-height: 1; pointer-events: none; }
.market-brand img { width: 13px; height: 13px; border-radius: 3px; }
.market-brand b { font-weight: 600; }
.technology-arc article > span, .cinemacc-era > span { color: var(--paper-42); font-family: var(--mono); font-size: var(--fs-mono); letter-spacing: .1em; text-transform: uppercase; }
.technology-arc h3, .cinemacc-era h3 { margin: 0; font-size: var(--fs-h3); font-weight: 520; letter-spacing: -.02em; }
.cinemacc-era h3 { font-size: clamp(23px, 2.15vw, 34px); line-height: 1.08; }
.technology-arc h3 a, .cinemacc-era h3 a { color: inherit; }
.technology-arc strong { font-size: clamp(24px, 2.45vw, 38px); font-weight: 530; letter-spacing: -.035em; line-height: 1; }
.technology-arc strong small { font-size: .42em; font-weight: 500; letter-spacing: 0; }
.era-price { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 8px; align-items: baseline; border-top: 1px solid var(--line); padding-top: 6px; }
.era-price small { color: var(--paper-28); font-family: var(--mono); font-size: var(--fs-mono); }
.era-price b { color: var(--paper-72); font-size: clamp(14px, 1.2vw, 18px); font-weight: 560; text-align: right; white-space: nowrap; }
.future-cost { display: grid; gap: 4px; margin-top: 2px; padding-top: 9px; border-top: 1px solid var(--line-strong); }
.future-cost small { color: var(--paper-42); font-family: var(--mono); font-size: var(--fs-mono); }
.future-cost strong { color: var(--paper); font-size: clamp(30px, 3.2vw, 48px); font-weight: 540; letter-spacing: -.045em; line-height: 1; }
.technology-arc p, .cinemacc-era p { margin: 0; max-width: 34ch; color: var(--paper-42); font-size: var(--fs-label); line-height: 1.45; }
.technology-arc p a, .cinemacc-era p a { color: var(--paper-72); text-decoration: underline; text-decoration-color: var(--line-strong); text-underline-offset: 3px; }
.technology-arc a, .cinemacc-era a { transition: opacity 180ms ease; }
.technology-arc a:hover, .cinemacc-era a:hover { opacity: .76; }
.regulation-evidence { min-height: 106px; padding-top: 10px; border-top: 1px solid var(--line-strong); }
.regulation-copy { display: grid; align-content: start; gap: 6px; }
.regulation-meta { display: block; }
.regulation-meta small { color: var(--paper-42); font-family: var(--mono); font-size: var(--fs-mono); letter-spacing: .08em; text-transform: uppercase; }
.regulation-meta a { color: var(--paper-42); font-family: var(--mono); font-size: var(--fs-mono); text-decoration: underline; text-decoration-color: var(--line-strong); text-underline-offset: 3px; transition: color 180ms ease; }
.regulation-meta a:hover { color: var(--paper); }
.regulation-statement { display: flex; flex-wrap: wrap; align-items: baseline; gap: 2px 8px; color: var(--paper); }
.regulation-statement > span { font-size: clamp(15px, 1.35vw, 21px); font-weight: 540; line-height: 1.25; }
.regulation-statement strong { font-size: clamp(25px, 2.7vw, 42px); font-weight: 540; letter-spacing: -.045em; line-height: 1; }
.regulation-statement strong small { color: var(--paper-56); font-size: .36em; font-weight: 500; letter-spacing: 0; }
.regulation-copy > p { margin: 0; color: var(--paper-42); font-family: var(--mono); font-size: var(--fs-mono); line-height: 1.35; }

/* 06 market size */
.market-opportunity { display: grid; grid-template-columns: 1.1fr .9fr; grid-template-rows: minmax(0, 1fr) auto; gap: clamp(24px, 3.5vh, 42px) clamp(38px, 5vw, 76px); min-height: 0; height: 100%; }
.cinema-model, .adjacent-model { display: grid; align-content: center; min-width: 0; padding-top: clamp(12px, 1.8vh, 18px); }
.market-opportunity h3 { margin: 0; color: var(--paper-56); font-family: var(--mono); font-size: var(--fs-label); font-weight: 500; letter-spacing: .08em; text-transform: uppercase; }
.cinema-equation { display: grid; grid-template-columns: minmax(0, 1.25fr) auto minmax(0, .65fr) auto minmax(0, 1fr); gap: clamp(9px, 1.2vw, 18px); align-items: end; margin-top: clamp(24px, 4vh, 52px); }
.equation-term { display: grid; gap: 7px; min-width: 0; }
.equation-term strong { font-size: clamp(32px, 3.7vw, 57px); font-weight: 530; letter-spacing: -.045em; line-height: .95; white-space: nowrap; }
.equation-term strong sup { margin-left: 3px; color: var(--paper-42); font-family: var(--mono); font-size: .28em; font-weight: 500; letter-spacing: 0; vertical-align: top; }
.equation-term span { color: var(--paper-42); font-size: var(--fs-label); line-height: 1.35; }
.equation-operator { align-self: center; color: var(--paper-28); font-family: var(--mono); font-size: clamp(17px, 1.7vw, 26px); font-style: normal; }
.renewal-equation { display: grid; grid-template-columns: auto auto auto auto auto; gap: clamp(7px, .8vw, 13px); align-items: baseline; margin-top: clamp(22px, 3.5vh, 42px); padding-top: clamp(13px, 1.8vh, 20px); border-top: 1px solid var(--line); }
.renewal-equation b, .renewal-equation strong { font-size: clamp(16px, 1.55vw, 24px); font-weight: 540; white-space: nowrap; }
.renewal-equation i { color: var(--paper-28); font-family: var(--mono); font-style: normal; }
.renewal-equation strong { color: var(--paper); }
.renewal-equation span { grid-column: 1 / -1; color: var(--paper-42); font-size: var(--fs-label); line-height: 1.35; }
.adjacent-heading { display: flex; align-items: end; justify-content: space-between; gap: 18px; }
.adjacent-heading strong { font-size: clamp(34px, 4.2vw, 64px); font-weight: 530; letter-spacing: -.05em; line-height: .9; }
.adjacent-stack { display: grid; grid-template-columns: 600fr 208fr 208fr 143fr; gap: 2px; height: clamp(18px, 2.4vh, 26px); margin-top: clamp(24px, 3.8vh, 48px); overflow: visible; }
.adjacent-stack button { position: relative; display: block; min-width: 0; height: 100%; border: 0; appearance: none; padding: 0; background: var(--paper-72); transform: scaleX(0); transform-origin: left; transition: filter 120ms ease, outline-color 120ms ease; }
.adjacent-stack button:nth-child(2) { background: var(--paper-56); }
.adjacent-stack button:nth-child(3) { background: var(--paper-42); }
.adjacent-stack button:nth-child(4) { background: var(--paper-28); }
.market-slide.is-visible .adjacent-stack button { animation: marketSegmentIn 620ms cubic-bezier(.16,1,.3,1) 340ms forwards; }
.market-slide.is-visible .adjacent-stack button:nth-child(2) { animation-delay: 430ms; }
.market-slide.is-visible .adjacent-stack button:nth-child(3) { animation-delay: 520ms; }
.market-slide.is-visible .adjacent-stack button:nth-child(4) { animation-delay: 610ms; }
.adjacent-stack button::after { content: attr(data-label) "  " attr(data-value); position: absolute; z-index: 2; left: 50%; bottom: calc(100% + 9px); padding: 6px 8px; border: 1px solid var(--line-strong); background: #151517; color: var(--paper); font-family: var(--mono); font-size: var(--fs-mono); font-weight: 520; line-height: 1; white-space: nowrap; opacity: 0; pointer-events: none; transform: translate(-50%, 5px); transition: opacity 140ms ease, transform 140ms ease; }
.adjacent-stack button:first-child::after { left: 0; transform: translate(0, 5px); }
.adjacent-stack button:last-child::after { right: 0; left: auto; transform: translate(0, 5px); }
.adjacent-stack button:hover, .adjacent-stack button:focus { filter: brightness(1.35); outline: 1px solid var(--paper-72); outline-offset: 2px; }
.adjacent-stack button:hover::after, .adjacent-stack button:focus::after { opacity: 1; transform: translate(-50%, 0); }
.adjacent-stack button:first-child:hover::after, .adjacent-stack button:first-child:focus::after, .adjacent-stack button:last-child:hover::after, .adjacent-stack button:last-child:focus::after { transform: translate(0, 0); }
.adjacent-stack button:focus:not(:focus-visible) { outline-color: var(--line-strong); }
.adjacent-stack button:active { filter: brightness(1.5); }
@keyframes marketSegmentIn { to { transform: scaleX(1); } }
.adjacent-legend { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px clamp(14px, 1.6vw, 24px); margin-top: 14px; }
.adjacent-legend > div { display: grid; grid-template-columns: 7px minmax(0, 1fr) auto; gap: 8px; align-items: center; min-width: 0; }
.adjacent-legend i { width: 7px; height: 7px; background: var(--paper-72); }
.adjacent-legend > div:nth-child(2) i { background: var(--paper-56); }
.adjacent-legend > div:nth-child(3) i { background: var(--paper-42); }
.adjacent-legend > div:nth-child(4) i { background: var(--paper-28); }
.adjacent-legend span { color: var(--paper-56); font-size: var(--fs-label); line-height: 1.3; }
.adjacent-legend b { color: var(--paper-72); font-size: var(--fs-label); font-weight: 540; }
.adjacent-model > p { margin: clamp(15px, 2.2vh, 24px) 0 0; color: var(--paper-28); font-family: var(--mono); font-size: var(--fs-mono); }
.opportunity-total { grid-column: 1 / -1; display: grid; grid-template-columns: minmax(170px, .7fr) minmax(0, 1.3fr); align-items: center; gap: 28px; padding-top: clamp(14px, 2vh, 22px); border-top: 1px solid var(--line-strong); }
.opportunity-total > span { color: var(--paper-42); font-family: var(--mono); font-size: var(--fs-mono); letter-spacing: .08em; text-transform: uppercase; }
.opportunity-total > div { display: grid; grid-template-columns: auto auto auto auto auto auto auto; align-items: baseline; justify-content: end; gap: clamp(8px, 1.1vw, 18px); }
.opportunity-total b { color: var(--paper-72); font-size: clamp(20px, 2vw, 31px); font-weight: 530; }
.opportunity-total small { color: var(--paper-42); font-family: var(--mono); font-size: var(--fs-mono); }
.opportunity-total i { color: var(--paper-28); font-family: var(--mono); font-size: var(--fs-body); font-style: normal; }
.opportunity-total strong { color: var(--caption); font-size: clamp(36px, 4.4vw, 68px); font-weight: 540; letter-spacing: -.05em; line-height: .9; }
.market-footnote { max-width: 116ch; line-height: 1.5; text-transform: none; }
.market-footnote sup { color: var(--paper-72); font-size: .8em; vertical-align: top; }

/* 07 risk and partnership */
.partnership-body { display: grid; grid-template-rows: minmax(0, 1fr) auto; gap: clamp(24px, 3.2vh, 42px); min-height: 0; }
.rights-flow { display: grid; grid-template-columns: 1fr 74px 1fr; align-items: stretch; min-height: 0; }
.flow-state { display: grid; align-content: center; gap: clamp(12px, 1.6vh, 20px); padding: clamp(22px, 3vw, 46px); border: 1px solid var(--line); background: #0f0f11; opacity: 0; }
.today-state { transform: translateX(-28px); }
.needed-state { border-color: color-mix(in srgb, var(--caption) 32%, transparent); background: color-mix(in srgb, var(--caption) 5%, #0f0f11); transform: translateX(28px); }
.partnership-slide.is-visible .flow-state { animation: experienceIn 720ms cubic-bezier(.16,1,.3,1) 260ms forwards; }
.partnership-slide.is-visible .needed-state { animation-delay: 500ms; }
.flow-state > span { color: var(--paper-42); font-family: var(--mono); font-size: var(--fs-mono); letter-spacing: .12em; text-transform: uppercase; }
.flow-state h3 { max-width: 18ch; margin: 0; font-size: clamp(23px, 2.3vw, 36px); font-weight: 530; line-height: 1.16; }
.needed-state h3 { color: var(--caption); }
.state-sequence { display: grid; grid-template-columns: auto 1fr auto 1fr auto; align-items: center; gap: clamp(8px, 1.1vw, 16px); margin-top: clamp(8px, 1.4vh, 18px); }
.state-sequence b { color: var(--paper-72); font-size: var(--fs-label); font-weight: 520; white-space: nowrap; }
.state-sequence i { color: var(--paper-28); font-style: normal; text-align: center; }
.collaboration-landscape { display: grid; grid-template-columns: minmax(150px, .72fr) 1.28fr; align-items: stretch; border-top: 1px solid var(--line-strong); opacity: 0; transform: translateY(20px); }
.partnership-slide.is-visible .collaboration-landscape { animation: reveal 620ms cubic-bezier(.16,1,.3,1) 760ms forwards; }
.collaboration-landscape > span { align-self: center; max-width: 22ch; color: var(--paper-42); font-family: var(--mono); font-size: var(--fs-mono); letter-spacing: .1em; text-transform: uppercase; }
.collaboration-landscape > div { display: grid; grid-template-columns: repeat(3, 1fr); }
.collaboration-landscape article { display: grid; align-content: center; gap: 6px; min-height: 82px; padding: 12px clamp(13px, 1.6vw, 24px); border-left: 1px solid var(--line); }
.collaboration-landscape b { font-size: var(--fs-body); font-weight: 540; }
.collaboration-landscape p { margin: 0; color: var(--paper-42); font-size: var(--fs-label); line-height: 1.4; }


@media (max-width: 1180px) {
  :root { --gutter-x: 38px; --gutter-y: 40px; --step: 18px; }
  .problem-body, .solution-body, .connect-body { gap: 28px; }
  .experience-stage { grid-template-columns: .9fr 36px 1.1fr; }
  .experience-panel { gap: 12px; padding: 11px; }
  .glasses-experience { grid-template-columns: 1fr; grid-template-rows: minmax(132px, 1fr) auto; }
  .experience-copy { gap: 7px; }
  .experience-copy ul { gap: 5px; }
  .hardware-ribbon { grid-template-columns: .72fr 1.28fr; }
  .market-story { grid-template-columns: minmax(0, 1.5fr) minmax(260px, .86fr); gap: 28px; }
  .market-future { padding-left: 22px; }
  .market-opportunity { column-gap: 28px; }
  .collaboration-landscape { grid-template-columns: minmax(130px, .6fr) 1.4fr; }
}

/* Short fields: tighten the vertical rhythm rather than capping the plates,
   which would only leave a hole where the rest of the row used to be. */
@media (max-height: 760px) {
  :root { --gutter-y: 34px; --step: 16px; }
  .market-history, .market-future { gap: 8px; }
  .cinemacc-era { grid-template-rows: minmax(148px, 21vh) auto auto auto minmax(0, 1fr); }
  .regulation-evidence { min-height: 94px; padding-top: 8px; }
  .market-opportunity { gap: 18px 28px; }
  .cinema-equation { margin-top: 20px; }
  .renewal-equation { margin-top: 18px; padding-top: 12px; }
  .adjacent-stack { margin-top: 20px; }
  .opportunity-total { padding-top: 12px; }
  .solution-evidence { gap: 12px; }
  .feedback-wall { min-height: 205px; }
  .experience-panel { padding: 10px; }
  .experience-copy { gap: 6px; }
  .experience-copy ul { gap: 4px; }
  .ideal-stack article, .vendor-state article { padding-top: 6px; padding-bottom: 6px; }
  .flow-state { padding: 20px 24px; }
  .collaboration-landscape article { min-height: 70px; padding-top: 8px; padding-bottom: 8px; }
}

@media (max-width: 680px) {
  body { overflow-x: hidden; overflow-y: auto; }
  .deck { width: 100%; max-width: 100%; height: auto; overflow-x: hidden; overflow-y: visible; scroll-snap-type: none; }
  :root { --gutter-x: 22px; --gutter-y: 70px; }
  .deck-controls { top: 14px; right: 18px; }
  .rail { display: none; }
  .slide { min-height: 100dvh; overflow-x: hidden; overflow-y: visible; border-bottom: 1px solid var(--line); }
  .slide-frame { width: 100%; max-width: 100%; gap: 30px; padding-bottom: 78px; }
  .slide-frame,
  .slide-head,
  .slide-body,
  .slide-foot,
  .slide-body > *,
  .slide figure,
  .slide article { min-width: 0; max-width: 100%; }
  .slide img { max-width: 100%; object-position: center center; }
  .slide :is(.product-figure, .product-plate, .problem-figure, .device-shot, .image-symbol, .wechat-qr) {
    margin-right: auto;
    margin-left: auto;
  }
  .experience-panel figure {
    width: 100%;
    margin: 0;
  }
  .slide-body { align-self: center; grid-template-rows: none; }
  .slide-count { display: none; }
  .logo-mark { right: 22px; bottom: 16px; }
  .slide-foot { flex-direction: column; align-items: flex-start; gap: 12px; }
  .slide h2 { font-size: clamp(32px, 8.4vw, 46px); }
  html[lang="zh-CN"] .slide h2 { max-width: none; font-size: clamp(29px, 7.5vw, 42px); }
  .opening-copy h1 { font-size: clamp(40px, 10.5vw, 58px); }
  html[lang="zh-CN"] .opening-copy h1 { max-width: none; font-size: clamp(37px, 9.8vw, 54px); }
  .feedback-heading { align-items: flex-start; flex-direction: column; }
  .feedback-wall {
    display: grid;
    grid-template-columns: 1fr;
    min-height: 0;
    gap: 12px;
  }
  .feedback-card {
    height: auto;
    margin-top: 0;
    opacity: 1;
    animation: none;
  }
  .feedback-card-surface {
    position: relative;
    top: auto;
    left: auto;
    width: 100%;
    min-height: 132px;
    aspect-ratio: auto;
    padding: 18px;
    transform: none !important;
    transition: border-color 180ms ease, background 180ms ease;
  }
  .feedback-card p {
    display: block;
    min-height: 0;
    overflow: visible;
    font-size: 17px;
    line-height: 1.42;
    -webkit-line-clamp: initial;
  }
  .feedback-card footer {
    gap: 9px;
    margin-top: 28px;
    font-size: 12px;
    line-height: 1.35;
  }
  .feedback-card footer > span {
    overflow: visible;
    white-space: normal;
  }
  .feedback-metrics { gap: 14px; }
  .feedback-metrics > span { gap: 4px; }
  .feedback-metrics svg { width: 12px; height: 12px; }
  .solution-body, .problem-body, .connect-body, .market-opportunity { grid-template-columns: 1fr; }
  .problem-figure { min-height: 270px; }
  .pain-grid { grid-template-columns: 1fr; }
  .pain-grid > article,
  .pain-grid > article.caption-pain {
    grid-template-columns: 104px minmax(0, 1fr);
    align-items: start;
    gap: 16px;
  }
  .pain-symbol {
    width: 100px;
    height: 84px;
  }
  .language-symbol {
    align-content: start;
    justify-content: center;
    padding-top: 9px;
  }
  .caption-pain .image-symbol { width: 100px; height: 84px; }
  .experience-stage { grid-template-columns: 1fr; }
  .experience-panel { min-height: 260px; }
  .phone-experience { min-height: 420px; }
  .phone-ledger figure { min-height: 96px; }
  .glasses-experience { grid-template-columns: 1fr; grid-template-rows: minmax(180px, 1fr) auto; }
  .experience-transfer { height: 34px; }
  .flow-transfer svg, .glasses-slide.is-visible .experience-transfer svg, .partnership-slide.is-visible .rights-transition svg { opacity: 1; transform: rotate(90deg); animation: none; }
  .hardware-ribbon { grid-template-columns: 1fr; }
  .ideal-brief > span { padding: 10px 0; }
  .vendor-state { grid-template-columns: 1fr; }
  .vendor-state article { border-top: 1px solid var(--line); border-left: 0; padding: 11px 0; }
  .foreign-caption { width: calc(100% - 20px); white-space: normal; text-align: center; }
  .product-plate { height: auto; width: min(100%, 260px); aspect-ratio: 1290 / 1880; }
  .market-story { grid-template-columns: 1fr; gap: 34px; }
  .market-future { padding: 22px 0 0; border-top: 1px solid var(--paper-56); border-left: 0; }
  .technology-arc { grid-template-columns: 1fr; }
  .technology-arc article { grid-template-rows: 180px auto auto auto auto 1fr; }
  .cinemacc-era { grid-template-rows: 220px auto auto auto 1fr; }
  .market-opportunity { grid-template-rows: none; }
  .cinema-equation { margin-top: 24px; }
  .equation-term strong { font-size: clamp(27px, 8.3vw, 40px); }
  .renewal-equation { grid-template-columns: auto auto auto auto auto; }
  .adjacent-legend { grid-template-columns: 1fr; }
  .opportunity-total { grid-column: auto; grid-template-columns: 1fr; gap: 14px; }
  .opportunity-total > div { justify-content: start; }
  .rights-flow { grid-template-columns: 1fr; }
  .rights-transition { height: 40px; }
  .collaboration-landscape { grid-template-columns: 1fr; }
  .collaboration-landscape > span { padding: 12px 0; }
  .collaboration-landscape > div { grid-template-columns: 1fr; }
  .collaboration-landscape article { border-top: 1px solid var(--line); border-left: 0; padding-left: 0; }
  .wechat-qr img { width: min(100%, 280px); }
}

/* Mobile Safari renders beneath its floating toolbar. Keep the opening slide's
   background continuous to the physical screen edge while its content remains
   inside the currently visible viewport. */
@supports (height: 100lvh) {
  @media (max-width: 680px) {
    :root { --mobile-browser-chrome: max(0px, calc(100lvh - 100dvh)); }
    .opening-slide { min-height: 100lvh; }
    .opening-slide .slide-frame {
      min-height: 0;
      padding-bottom: calc(78px + var(--mobile-browser-chrome));
    }
    .opening-slide .logo-mark { bottom: calc(16px + var(--mobile-browser-chrome)); }
  }
}

/* Mobile polish: respect notches, provide a reliable language target, and let
   long contact details wrap without breaking the deck width. */
@media (max-width: 680px) {
  .slide-frame {
    padding-left: max(22px, env(safe-area-inset-left));
    padding-right: max(22px, env(safe-area-inset-right));
  }
  .deck-controls {
    position: absolute;
    top: max(12px, env(safe-area-inset-top));
    right: max(16px, env(safe-area-inset-right));
  }
  #language-control {
    min-width: 46px;
    min-height: 34px;
    padding: 0 13px;
    border-color: color-mix(in srgb, var(--paper) 24%, transparent);
    background: color-mix(in srgb, #171719 88%, transparent);
    box-shadow:
      inset 0 1px 0 color-mix(in srgb, var(--paper) 10%, transparent),
      0 8px 28px color-mix(in srgb, var(--ink) 36%, transparent);
    color: var(--paper);
    -webkit-backdrop-filter: blur(14px);
    backdrop-filter: blur(14px);
  }
  .control {
    display: grid;
    min-width: 44px;
    min-height: 44px;
    place-items: center;
    padding: 0;
  }
  .state-sequence {
    grid-template-columns: repeat(5, auto);
    justify-content: space-between;
    gap: 6px;
  }
  .state-sequence b {
    white-space: normal;
    text-align: center;
  }

  /* Keep the same opening film on every device. Phones crop its product focus
     into a portrait frame instead of substituting a different advertisement. */
  .opening-slide {
    display: flex;
    flex-direction: column;
  }
  .opening-visual {
    position: relative;
    z-index: 0;
    inset: auto;
    flex: 0 0 auto;
    width: 76vw;
    max-width: 360px;
    height: auto;
    aspect-ratio: 4 / 5;
    margin: max(54px, calc(env(safe-area-inset-top) + 44px)) auto 0;
    overflow: hidden;
    background: var(--ink);
  }
  .opening-visual video {
    position: absolute;
    inset: 0;
    width: 100%;
    max-width: 100%;
    height: 100%;
    margin: 0;
    object-fit: cover;
    object-position: 76% center;
    filter: saturate(.96) contrast(1.02) brightness(.95);
    transform: none;
    animation: none !important;
  }
  .opening-slide .slide-frame {
    flex: 0 0 auto;
    grid-template-rows: 0 auto 0;
    gap: 0;
    min-height: 0;
    padding-top: clamp(24px, 3.8dvh, 34px);
  }
  .opening-slide .slide-head,
  .opening-slide .slide-foot {
    min-height: 0;
    overflow: hidden;
  }
  .opening-slide .slide-body {
    align-self: start;
  }
  .opening-copy {
    position: relative;
    z-index: 1;
    gap: clamp(10px, 1.8dvh, 16px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .deck { scroll-behavior: auto; }
  .reveal,
  .opening-kicker,
  .opening-line,
  .pain-grid > article,
  .experience-panel,
  .hardware-ribbon,
  .technology-arc > article,
  .flow-state,
  .collaboration-landscape,
  .connect-links > a { opacity: 1; transform: none; }
  .slide.is-visible .reveal,
  .slide.is-visible :is(.pain-grid, .technology-arc, .connect-links) > *,
  .slide.is-visible :is(.opening-kicker, .opening-line, .experience-panel, .hardware-ribbon, .flow-state, .collaboration-landscape) { animation: none; }
  .opening-visual video { animation: none; transform: none; }
  .adjacent-stack button { animation: none; transform: scaleX(1); }
  .adjacent-stack button::after { transition: none; }
  .solution-slide.is-visible .feedback-card { opacity: 1; animation: none; }
  .feedback-card-surface { transition: none; }
  .flow-transfer svg { animation: none; opacity: 1; transform: none; }
  .progress div { transition: none; }
}

@media (min-width: 681px) and (prefers-reduced-motion: reduce) {
  .feedback-card-surface { transform: translateX(-50%) rotate(var(--turn)) !important; }
}

@media (max-width: 680px) and (prefers-reduced-motion: reduce) {
  .flow-transfer svg { transform: rotate(90deg); }
}

@media print {
  @page { size: 16in 9in; margin: 0; }
  body { overflow: visible; }
  .deck { height: auto; overflow: visible; }
  .slide { break-after: page; min-height: 100vh; }
  .deck-controls, .rail, .progress, .slide-count { display: none; }
  .reveal,
  .opening-kicker,
  .opening-line,
  .pain-grid > article,
  .experience-panel,
  .hardware-ribbon,
  .technology-arc > article,
  .flow-state,
  .collaboration-landscape,
  .connect-links > a { opacity: 1; transform: none; }
  .adjacent-stack button { transform: scaleX(1); }
  .adjacent-stack button::after { display: none; }
  .feedback-card { opacity: 1 !important; animation: none !important; }
}