:root {
  --bg: #07111f;
  --bg-soft: #0c1728;
  --bg-card: rgba(17, 28, 46, 0.88);
  --text: #eef4ff;
  --muted: #9fb0ca;
  --line: rgba(255, 255, 255, 0.10);
  --line-dark: rgba(12, 24, 40, 0.12);
  --white: #ffffff;
  --navy: #0d1c34;
  --accent: #6bb3ff;
  --accent-2: #79ffd4;
  --accent-3: #ffc776;
  --danger: #ff7984;
  --success: #6be69a;
  --warning: #ffb86b;
  --ink: #1b2b43;
  --shadow: 0 18px 52px rgba(3, 10, 20, 0.20);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 18px;
  --radius-sm: 14px;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; }
body {
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: linear-gradient(160deg, #091423 0%, #0b1628 55%, #112140 100%);
  color: var(--text);
  overflow: hidden;
}
a { color: inherit; }
button { font: inherit; }
.app-shell { height: 100vh; position: relative; }
.topbar {
  position: fixed;
  top: 16px;
  left: 24px;
  right: 24px;
  height: 60px;
  z-index: 40;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(7, 17, 31, 0.68);
  backdrop-filter: blur(16px);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 12px 8px 10px;
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.16);
}
.brand-wrap { display: flex; align-items: center; gap: 12px; min-width: 0; }
.brand-mark {
  width: 44px; height: 44px; border-radius: 14px;
  background: linear-gradient(135deg, rgba(121, 255, 212, 0.92), rgba(107, 179, 255, 0.95));
  color: #08213c; font-weight: 900; display: grid; place-items: center; letter-spacing: -.03em;
}
.brand-copy { display: flex; flex-direction: column; min-width: 0; }
.brand-copy strong { font-size: 14px; }
.brand-copy span { font-size: 11px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.topbar-actions { display: flex; gap: 10px; align-items: center; }
.ghost-btn, .primary-btn {
  border: 1px solid var(--line); border-radius: 999px; padding: 10px 16px; text-decoration: none;
  display: inline-flex; align-items: center; justify-content: center; cursor: pointer; transition: .25s ease;
}
.ghost-btn { background: rgba(255,255,255,.04); color: var(--text); }
.ghost-btn:hover, .primary-btn:hover, .icon-btn:hover { transform: translateY(-1px); }
.primary-btn { background: linear-gradient(135deg, var(--accent), #9bd0ff); color: #061629; font-weight: 800; border: none; }
.ghost-btn.large { padding-inline: 20px; }
.icon-btn {
  width: 48px; height: 48px; border-radius: 50%; border: 1px solid var(--line);
  background: rgba(255,255,255,.04); color: var(--text); cursor: pointer; font-size: 26px; line-height: 1;
  display: grid; place-items: center;
}
.side-nav {
  position: fixed; right: 18px; top: 50%; transform: translateY(-50%); z-index: 25;
  display: flex; flex-direction: column; gap: 10px;
}
.side-dot {
  width: 14px; height: 14px; border-radius: 999px; border: 1px solid rgba(22, 41, 70, 0.30);
  background: rgba(130, 146, 168, 0.24); cursor: pointer; position: relative; transition: .25s ease;
  box-shadow: 0 0 0 2px rgba(255,255,255,.26);
}
.side-dot.active { background: linear-gradient(135deg, var(--accent-2), var(--accent)); transform: scale(1.18); border-color: transparent; box-shadow: 0 0 0 3px rgba(107,179,255,.22); }
.side-dot span {
  position: absolute; right: 24px; top: 50%; transform: translateY(-50%);
  white-space: nowrap; opacity: 0; pointer-events: none; transition: .2s ease;
  background: rgba(7,17,31,.92); color: #fff; padding: 8px 12px; border-radius: 999px; border: 1px solid var(--line); font-size: 12px;
}
.side-dot:hover span { opacity: 1; }
.deck {
  height: 100vh;
  display: flex;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
}
.deck::-webkit-scrollbar { display: none; }
.slide {
  position: relative;
  flex: 0 0 100vw;
  height: 100vh;
  padding: 92px 56px 76px;
  overflow: hidden;
  scroll-snap-align: start;
}
.slide::before {
  content: "";
  position: absolute; inset: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(255,255,255,.03) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.03) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(circle at 50% 50%, #000 58%, transparent 94%);
  opacity: .42;
}
.theme-light { color: var(--ink); background: linear-gradient(180deg, #f7fbff 0%, #edf3fb 100%); }
.theme-light::before { background-image: linear-gradient(rgba(11,23,40,.038) 1px, transparent 1px), linear-gradient(90deg, rgba(11,23,40,.038) 1px, transparent 1px); opacity: .72; }
.theme-dark { color: var(--text); }
.hero {
  background:
    radial-gradient(circle at 18% 30%, rgba(121,255,212,.10), transparent 18%),
    radial-gradient(circle at 78% 22%, rgba(107,179,255,.16), transparent 22%),
    linear-gradient(180deg, #07111f 0%, #0a1527 100%);
}
.slide-inner { width: min(1380px, 100%); height: 100%; margin: 0 auto; position: relative; z-index: 1; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; align-items: center; }
.split-60 { grid-template-columns: 1.12fr .92fr; }
.split-58 { grid-template-columns: 1.08fr .92fr; }
.split-52 { grid-template-columns: .96fr 1.04fr; }
.split-48 { grid-template-columns: 1fr .94fr; }
.hero-grid { grid-template-columns: 1.02fr .98fr; }
.fit-height { align-items: stretch; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 10px; margin: 0 0 14px;
  font-size: 12px; text-transform: uppercase; letter-spacing: .16em; font-weight: 800; color: var(--accent-2);
}
.eyebrow::before { content: ""; width: 32px; height: 2px; border-radius: 999px; background: currentColor; }
.eyebrow.dark { color: #3b77c6; }
h1, h2, h3, p, ul { margin: 0; }
h1 {
  font-size: clamp(54px, 5.8vw, 86px);
  line-height: .94; letter-spacing: -.07em; max-width: 860px;
}
h1 span { color: #8ac8ff; }
h2 {
  font-size: clamp(34px, 4.2vw, 66px);
  line-height: .96; letter-spacing: -.055em; max-width: 920px;
}
h3 { font-size: 20px; letter-spacing: -.03em; }
.lede, .subhead {
  font-size: clamp(16px, 1.55vw, 22px); line-height: 1.44; max-width: 840px; margin-top: 14px;
  color: var(--muted);
}
.subhead.dark { color: #51627e; }
.compact-head { margin-bottom: 18px; }
.hero-copy { align-self: center; }
.chip-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.chip {
  display: inline-flex; align-items: center; padding: 10px 14px; border-radius: 999px;
  border: 1px solid var(--line); background: rgba(255,255,255,.04); color: #d9e6fb; font-size: 14px; font-weight: 650;
}
.story-rail {
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; margin-top: 26px; max-width: 700px;
}
.story-rail div { padding: 12px 14px; border-radius: 16px; background: rgba(255,255,255,.04); border: 1px solid var(--line); }
.story-rail small { display: block; color: var(--accent-2); font-weight: 800; letter-spacing: .1em; margin-bottom: 6px; }
.story-rail span { font-size: 14px; color: #eaf1ff; }
.hero-visual { position: relative; padding: 6px 18px; }
.image-frame { border-radius: var(--radius-xl); overflow: hidden; box-shadow: var(--shadow); position: relative; }
.image-frame img { width: 100%; height: 100%; display: block; object-fit: cover; }
.image-frame.tall { height: min(67vh, 700px); }
.glow-frame::after, .dark-frame::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(180deg, rgba(7,17,31,.02) 0%, rgba(7,17,31,.18) 100%);
}
.paper-frame {
  background: #fff; padding: 14px; border: 1px solid var(--line-dark); box-shadow: 0 14px 40px rgba(11,23,40,.10);
}
.paper-frame img { object-fit: contain; background: #fff; }
.dark-frame { background: rgba(255,255,255,.05); padding: 14px; border: 1px solid rgba(255,255,255,.12); }
.labelled-frame { padding-top: 42px; }
.image-title-overlay {
  position: absolute; top: 10px; left: 50%; transform: translateX(-50%); z-index: 3;
  font-size: 18px; font-weight: 800; letter-spacing: -.02em; color: #16335f;
  background: rgba(255,255,255,.96); padding: 6px 14px; border-radius: 999px; box-shadow: 0 4px 14px rgba(15,30,53,.08);
}
.dark-labelled .image-title-overlay { background: rgba(9, 19, 35, .92); color: #dfeaff; box-shadow: none; }
.large-visual .image-frame { height: 100%; max-height: 72vh; }
.narrow-text { display: flex; flex-direction: column; justify-content: center; }
.slide-installation .narrow-text h2,
.slide-target .narrow-text h2,
.slide-placement .narrow-text h2 { font-size: clamp(34px, 4vw, 62px); }
.floating-stat {
  position: absolute; max-width: 220px; padding: 14px 16px; border-radius: 18px; background: rgba(7,17,31,.82); border: 1px solid var(--line);
  box-shadow: 0 12px 32px rgba(0,0,0,.18);
}
.floating-stat strong { display: block; margin-bottom: 6px; font-size: 15px; }
.floating-stat span { color: var(--muted); font-size: 13px; line-height: 1.42; }
.stat-a { left: -8px; bottom: 12px; }
.stat-b { right: -8px; top: 92px; }
.section-head { margin-bottom: 18px; }
.kpi-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; margin-top: 22px; }
.kpi-card {
  padding: 18px; border-radius: var(--radius-lg); border: 1px solid var(--line); background: rgba(255,255,255,.05); box-shadow: var(--shadow);
  display: flex; flex-direction: column;
}
.card-visual {
  height: 90px; margin-bottom: 14px; border-radius: 18px; overflow: hidden; background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.12);
}
.card-visual img { width: 100%; height: 100%; object-fit: cover; display: block; }
.kpi-card strong { display: block; font-size: 38px; line-height: .96; letter-spacing: -.05em; margin: 6px 0 4px; }
.kpi-card p { color: var(--muted); line-height: 1.42; font-size: 14px; margin-top: 10px; }
.kpi-label { display: inline-flex; font-size: 12px; text-transform: uppercase; letter-spacing: .16em; font-weight: 800; color: #bbd5f8; }
.kpi-unit { display: block; font-size: 14px; color: #dce6fa; min-height: 40px; }
.kpi-card.success { border-color: rgba(107,230,154,.26); }
.kpi-card.warning { border-color: rgba(255,184,107,.3); }
.kpi-card.highlight { border-color: rgba(121,255,212,.26); background: linear-gradient(180deg, rgba(121,255,212,.09), rgba(107,179,255,.06)); }
.visual-column, .text-column { min-width: 0; }
.bullet-stack { display: grid; gap: 12px; margin-top: 18px; }
.bullet-stack.compact { gap: 10px; }
.bullet-stack.tighter .bullet-card { padding: 16px 18px; }
.bullet-card {
  padding: 18px 20px; border-radius: 20px; background: rgba(255,255,255,.78); border: 1px solid rgba(14,31,53,.08);
  box-shadow: 0 10px 24px rgba(13,28,52,.05);
}
.bullet-card h3 { font-size: 18px; margin-bottom: 6px; }
.bullet-card p { color: #4f617c; line-height: 1.45; font-size: 15px; }
.bullet-card.accent { background: linear-gradient(180deg, rgba(107,179,255,.12), rgba(121,255,212,.10)); border-color: rgba(59,119,198,.16); }
.dark-cards .bullet-card, .theme-dark .bullet-card { background: rgba(255,255,255,.06); border-color: rgba(255,255,255,.08); box-shadow: none; }
.dark-cards .bullet-card p, .theme-dark .bullet-card p { color: var(--muted); }
.mini-kpis { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; margin: 18px 0 6px; }
.mini-kpis div { padding: 14px; background: rgba(14,31,53,.05); border: 1px solid rgba(14,31,53,.08); border-radius: 16px; }
.mini-kpis strong { display: block; font-size: 24px; letter-spacing: -.04em; margin-bottom: 4px; }
.mini-kpis span { color: #5d6f8a; font-size: 13px; }
.analysis-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; margin-top: 18px; }
.analysis-card {
  background: rgba(255,255,255,.92); border: 1px solid rgba(14,31,53,.08); border-radius: 22px; padding: 20px; box-shadow: 0 12px 28px rgba(13,28,52,.07);
}
.analysis-card .tag { display: inline-flex; padding: 7px 10px; border-radius: 999px; background: rgba(59,119,198,.08); color: #3b77c6; font-size: 12px; font-weight: 800; text-transform: uppercase; letter-spacing: .12em; }
.analysis-card h3 { margin: 12px 0 8px; font-size: 20px; }
.analysis-card p, .analysis-card li { color: #51627e; line-height: 1.46; font-size: 15px; }
.analysis-card ul { padding-left: 18px; display: grid; gap: 5px; margin-top: 10px; }
.analysis-card.good-border { border-color: rgba(107,230,154,.34); }
.analysis-card.accent-card { background: linear-gradient(180deg, rgba(107,179,255,.10), rgba(121,255,212,.08)); }
.big-number { font-size: 48px; line-height: .92; letter-spacing: -.06em; color: #112c51; }
.big-number span { font-size: 18px; color: #5d6f8a; margin-left: 6px; }
.compare-grid { display: grid; grid-template-columns: 1fr 1fr .95fr; gap: 16px; margin-top: 18px; }
.compare-card, .quote-card, .mode-card, .road-card, .summary-card { border-radius: 24px; box-shadow: var(--shadow); }
.compare-card, .mode-card { padding: 20px; border: 1px solid var(--line); background: rgba(255,255,255,.05); }
.bad-tone { background: linear-gradient(180deg, rgba(255,121,132,.12), rgba(255,184,107,.05)); }
.good-tone { background: linear-gradient(180deg, rgba(107,230,154,.16), rgba(107,179,255,.08)); }
.mini-signal { height: 52px; width: 74px; margin-bottom: 10px; }
.mini-signal img { width: 100%; height: 100%; object-fit: contain; }
.compare-title { display: block; color: #d6e5ff; font-size: 14px; font-weight: 700; min-height: 42px; }
.compare-metric { margin-top: 12px; display: flex; align-items: baseline; gap: 8px; }
.compare-metric strong { font-size: 54px; line-height: .9; letter-spacing: -.07em; }
.compare-metric span { color: #d3deef; font-size: 14px; }
.compare-metric.warn strong { color: #ffcf83; }
.compare-detail { margin-top: 4px; color: var(--muted); font-size: 13px; }
.quote-card { background: rgba(255,255,255,.04); border: 1px solid var(--line); padding: 24px; }
.quote-card blockquote { margin: 0 0 14px; font-size: 30px; line-height: 1.08; letter-spacing: -.05em; font-weight: 850; }
.quote-card p { color: var(--muted); line-height: 1.55; }
.before-after { display: grid; grid-template-columns: 1fr 86px 1.08fr; gap: 18px; align-items: stretch; margin-top: 18px; }
.mode-head { display: flex; justify-content: space-between; align-items: end; gap: 10px; margin-bottom: 16px; }
.mode-head span { color: var(--muted); font-size: 14px; }
.result-list { list-style: none; padding: 0; display: grid; gap: 10px; }
.result-list li { display: flex; justify-content: space-between; gap: 16px; border-top: 1px solid rgba(255,255,255,.08); padding-top: 10px; }
.arrow-card { display: grid; place-items: center; font-size: 52px; color: var(--accent-2); font-weight: 900; }
.impact-banner, .note-banner {
  margin-top: 16px; padding: 16px 18px; border-radius: 18px; border: 1px solid var(--line); background: rgba(255,255,255,.05); display: flex; gap: 12px; align-items: start;
}
.impact-banner strong, .note-banner strong { white-space: nowrap; }
.impact-banner span, .note-banner span { color: var(--muted); line-height: 1.5; }
.placement-table { margin-top: 18px; border-radius: 22px; overflow: hidden; border: 1px solid rgba(14,31,53,.08); background: #fff; box-shadow: 0 14px 30px rgba(13,28,52,.08); }
.placement-head, .placement-row { display: grid; grid-template-columns: 1fr 1.25fr; gap: 14px; align-items: center; padding: 14px 16px; }
.placement-head { background: #f2f7fc; font-size: 12px; text-transform: uppercase; letter-spacing: .1em; color: #5f718c; font-weight: 800; }
.placement-row { border-top: 1px solid rgba(14,31,53,.08); color: #263851; font-size: 15px; }
.placement-row strong { letter-spacing: -.02em; }
.placement-row.win { background: linear-gradient(180deg, rgba(107,230,154,.16), rgba(107,179,255,.06)); }
.roadmap { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; margin-top: 18px; }
.road-card {
  position: relative; background: #fff; border: 1px solid rgba(14,31,53,.08); padding: 18px; color: #263851; box-shadow: 0 14px 30px rgba(13,28,52,.08);
  display: flex; flex-direction: column;
}
.road-illustration { height: 74px; border-radius: 16px; overflow: hidden; background: #f4f8fe; border: 1px solid rgba(14,31,53,.06); margin-bottom: 14px; }
.road-illustration img { width: 100%; height: 100%; object-fit: cover; display: block; }
.road-card h3 { margin: 14px 0 8px; font-size: 18px; }
.road-card p { color: #4f617c; line-height: 1.45; font-size: 15px; min-height: 98px; }
.road-card small { color: #6d7f99; display: block; margin-top: 12px; font-size: 13px; }
.step-index { width: 40px; height: 40px; border-radius: 14px; display: grid; place-items: center; font-weight: 900; color: #fff; }
.priority-1 .step-index { background: #2fc179; }
.priority-2 .step-index { background: #4e8eff; }
.priority-3 .step-index { background: #7f64f7; }
.priority-4 .step-index { background: #f2994a; }
.result-strip { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 12px; margin-top: 18px; }
.result-strip div { padding: 14px; border-radius: 18px; background: rgba(255,255,255,.06); border: 1px solid var(--line); }
.result-strip strong { display: block; margin-bottom: 6px; }
.result-strip span { color: var(--muted); font-size: 14px; }
.final-slide {
  background:
    radial-gradient(circle at 80% 18%, rgba(121,255,212,.10), transparent 16%),
    radial-gradient(circle at 25% 78%, rgba(107,179,255,.16), transparent 18%),
    linear-gradient(180deg, #07111f 0%, #0a1527 100%);
}
.next-actions { display: grid; gap: 10px; margin-top: 20px; }
.next-actions div { padding: 16px 18px; border: 1px solid var(--line); border-radius: 18px; background: rgba(255,255,255,.04); }
.next-actions span { display: block; color: var(--accent-2); font-size: 12px; text-transform: uppercase; letter-spacing: .14em; font-weight: 800; margin-bottom: 8px; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 22px; }
.summary-card { background: linear-gradient(180deg, rgba(255,255,255,.08), rgba(255,255,255,.04)); border: 1px solid var(--line); padding: 26px; min-height: 360px; display: flex; flex-direction: column; justify-content: center; }
.summary-top { color: var(--accent-2); text-transform: uppercase; letter-spacing: .16em; font-size: 12px; font-weight: 800; margin-bottom: 10px; }
.summary-big { font-size: 46px; line-height: .96; letter-spacing: -.06em; font-weight: 900; max-width: 480px; }
.summary-card ul { padding-left: 20px; color: var(--muted); display: grid; gap: 10px; margin: 18px 0 0; }
.summary-foot { margin-top: 20px; color: #dce6fb; font-size: 14px; }
.controls {
  position: fixed; left: 50%; bottom: 16px; transform: translateX(-50%); z-index: 30;
  display: flex; align-items: center; gap: 12px; padding: 8px 12px; border-radius: 999px;
  background: rgba(7,17,31,.68); border: 1px solid var(--line); backdrop-filter: blur(14px);
}
.control-center { display: flex; align-items: center; gap: 12px; min-width: 240px; }
.control-center span { font-variant-numeric: tabular-nums; font-weight: 800; }
.progress-track { width: 160px; height: 6px; background: rgba(255,255,255,.12); border-radius: 999px; overflow: hidden; }
.progress-fill { height: 100%; width: 0%; background: linear-gradient(90deg, var(--accent-2), var(--accent)); border-radius: inherit; }
.overview {
  position: fixed; inset: 0; background: rgba(6, 12, 21, 0.58); backdrop-filter: blur(12px); z-index: 55; display: none; align-items: center; justify-content: center; padding: 28px;
}
.overview.open { display: flex; }
.overview-panel { width: min(1180px, 100%); max-height: 86vh; overflow: auto; border-radius: 28px; background: rgba(7,17,31,.96); border: 1px solid var(--line); box-shadow: var(--shadow); padding: 28px; }
.overview-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 18px; }
.overview-header h2 { font-size: 32px; }
.overview-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.overview-item { padding: 20px; border-radius: 20px; border: 1px solid var(--line); background: rgba(255,255,255,.04); cursor: pointer; }
.overview-item small { color: var(--accent-2); font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.overview-item strong { display: block; font-size: 20px; margin: 8px 0 10px; }
.overview-item p { color: var(--muted); line-height: 1.5; font-size: 14px; }
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .65s ease, transform .65s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }
.delay-1 { transition-delay: .12s; }
.delay-2 { transition-delay: .24s; }
.small-shadow { box-shadow: 0 18px 40px rgba(13,28,52,.10); }

/* Slide-specific tuning */
.slide-hero .lede { max-width: 760px; }
.slide-verdict .kpi-card { min-height: 330px; }
.slide-repeater .quote-card { align-self: stretch; display: flex; flex-direction: column; justify-content: center; }
.slide-placement .large-visual .image-frame,
.slide-installation .large-visual .image-frame,
.slide-wifi-direct .large-visual .image-frame,
.slide-target .large-visual .image-frame { max-height: 70vh; }
.slide-target .result-strip { margin-top: auto; }
.compact-strip div { min-height: 78px; }
.reverse-balance { grid-template-columns: .92fr 1.08fr; }
.compact-actions strong { font-size: 16px; }
.compact-summary .summary-big { font-size: 42px; }

@media (max-width: 1500px) {
  .slide { padding-inline: 46px; }
  h2 { font-size: clamp(32px, 4vw, 58px); }
  .summary-big { font-size: 40px; }
  .slide-target .narrow-text h2,
  .slide-installation .narrow-text h2,
  .slide-placement .narrow-text h2 { font-size: clamp(32px, 3.8vw, 54px); }
}
@media (max-width: 1280px) {
  .slide { padding-inline: 36px; }
  .two-col, .split-60, .split-58, .split-52, .split-48, .hero-grid { gap: 22px; }
  .kpi-card strong { font-size: 34px; }
  .card-visual { height: 80px; }
  .analysis-grid, .kpi-grid, .roadmap, .compare-grid { gap: 14px; }
  .road-card p { min-height: 112px; }
  .summary-big { font-size: 36px; }
}
@media (max-width: 1100px) {
  body { overflow: auto; }
  .topbar, .side-nav, .controls { display: none; }
  .deck { display: block; overflow: visible; height: auto; }
  .slide { height: auto; min-height: 100vh; padding: 92px 20px 42px; }
  .slide::before { mask-image: none; }
  .two-col, .hero-grid, .split-60, .split-58, .split-52, .split-48,
  .analysis-grid, .kpi-grid, .compare-grid, .before-after, .roadmap, .mini-kpis, .result-strip, .overview-grid {
    grid-template-columns: 1fr;
  }
  .hero-visual { order: -1; }
  .image-frame.tall, .large-visual .image-frame { height: auto; max-height: none; }
  .story-rail { grid-template-columns: 1fr 1fr; }
  .floating-stat { position: static; margin-top: 12px; max-width: none; }
  .placement-head, .placement-row { grid-template-columns: 1fr; }
  .summary-card { min-height: auto; }
  .road-card p { min-height: 0; }
}

/* v4 corrections from screen review */
.card-visual,
.road-illustration {
  background: #fff;
  display: grid;
  place-items: center;
}
.card-visual img,
.road-illustration img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.with-visuals .card-visual { height: 108px; padding: 4px; }
.road-illustration { height: 68px; padding: 4px; }
.labelled-frame { padding-top: 14px; }
.image-title-overlay { display: none !important; }

.slide-roadmap .slide-inner { padding-bottom: 54px; }
.slide-roadmap .section-head { margin-bottom: 12px; }
.slide-roadmap .roadmap { margin-top: 14px; }
.slide-roadmap .road-card { padding: 14px; }
.slide-roadmap .road-card h3 { font-size: 17px; margin: 10px 0 7px; }
.slide-roadmap .road-card p { font-size: 14px; line-height: 1.35; min-height: 78px; }
.slide-roadmap .road-card small { font-size: 12px; line-height: 1.25; margin-top: 8px; }
.slide-roadmap .note-banner { margin-top: 10px; padding: 12px 16px; font-size: 14px; line-height: 1.35; }
.slide-roadmap .step-index { width: 34px; height: 34px; border-radius: 12px; }

.overview-panel {
  max-height: 82vh;
  overflow-y: auto;
}
.overview-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}
.overview-item {
  color: var(--text);
  text-align: center;
  padding: 14px 12px;
  min-height: 122px;
}
.overview-item strong {
  color: #f1f6ff;
  font-size: 17px;
  line-height: 1.15;
}
.overview-item p {
  font-size: 12px;
  line-height: 1.35;
}

.final-slide .text-column h2 { font-size: clamp(34px, 3.6vw, 56px); }
.final-slide .subhead { font-size: clamp(15px, 1.35vw, 19px); line-height: 1.38; }
.final-slide .next-actions { margin-top: 14px; gap: 8px; }
.final-slide .next-actions div { padding: 12px 16px; }
.final-slide .next-actions span { margin-bottom: 5px; }
.final-slide .compact-actions strong { font-size: 15px; line-height: 1.35; }
.final-slide .cta-row { margin-top: 14px; }
.final-slide .summary-card { min-height: 320px; }
.final-slide .summary-big { font-size: 38px; }
.final-slide .summary-card ul { margin-top: 14px; gap: 7px; }

@media (max-height: 900px) and (min-width: 1101px) {
  .topbar { height: 56px; top: 14px; }
  .brand-mark { width: 40px; height: 40px; }
  .slide { padding-top: 84px; padding-bottom: 68px; }
  h1 { font-size: clamp(48px, 5.2vw, 76px); }
  h2 { font-size: clamp(30px, 3.8vw, 56px); }
  .lede, .subhead { font-size: clamp(15px, 1.35vw, 20px); line-height: 1.36; }
  .eyebrow { margin-bottom: 10px; }
  .section-head { margin-bottom: 12px; }
  .kpi-grid { margin-top: 14px; }
  .with-visuals .card-visual { height: 82px; }
  .kpi-card { padding: 14px; }
  .kpi-card strong { font-size: 32px; }
  .kpi-card p { font-size: 13px; line-height: 1.34; }
  .kpi-unit { min-height: 32px; font-size: 13px; }
  .large-visual .image-frame { max-height: 65vh !important; }
  .bullet-stack.tighter .bullet-card { padding: 12px 15px; }
  .bullet-card h3 { font-size: 16px; }
  .bullet-card p { font-size: 13.5px; line-height: 1.34; }
  .mini-kpis div { padding: 10px; }
  .mini-kpis strong { font-size: 21px; }
  .placement-row, .placement-head { padding: 10px 14px; }
  .controls { bottom: 8px; transform: translateX(-50%) scale(.92); }
  .road-illustration { height: 54px; }
  .slide-roadmap .road-card p { min-height: 64px; font-size: 13px; }
  .slide-roadmap .note-banner { font-size: 12.5px; padding: 10px 14px; }
  .final-slide .text-column h2 { font-size: clamp(30px, 3.1vw, 48px); }
  .final-slide .subhead { font-size: 15px; }
  .final-slide .next-actions div { padding: 10px 14px; }
  .final-slide .summary-big { font-size: 32px; }
  .summary-card { padding: 20px; }
}

/* V5 — cinematic experience layer */
.app-shell::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  background:
    radial-gradient(circle at var(--mx, 50%) var(--my, 50%), rgba(107,179,255,.08), transparent 18%),
    linear-gradient(90deg, rgba(121,255,212,.02), transparent 45%, rgba(107,179,255,.03));
  opacity: .75;
}
.topbar { z-index: 60; }
.guided-btn.active {
  background: linear-gradient(135deg, rgba(121,255,212,.22), rgba(107,179,255,.20));
  border-color: rgba(121,255,212,.42);
  box-shadow: 0 0 0 3px rgba(121,255,212,.08) inset;
}
.story-progress {
  position: fixed;
  left: 50%;
  transform: translateX(-50%);
  top: 88px;
  z-index: 38;
  display: flex;
  align-items: center;
  gap: 0;
  padding: 8px 10px;
  border: 1px solid rgba(255,255,255,.08);
  border-radius: 999px;
  background: rgba(7,17,31,.34);
  backdrop-filter: blur(12px);
  box-shadow: 0 10px 28px rgba(0,0,0,.12);
}
.story-step {
  position: relative;
  appearance: none;
  border: 0;
  background: transparent;
  color: rgba(224,236,255,.58);
  padding: 7px 14px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .10em;
  text-transform: uppercase;
}
.story-step:not(:last-child)::after {
  content: "";
  position: absolute;
  right: -8px;
  top: 50%;
  width: 16px;
  height: 1px;
  background: rgba(255,255,255,.16);
}
.story-step.active {
  color: #061629;
  background: linear-gradient(135deg, var(--accent-2), var(--accent));
}
.theme-light ~ .story-progress, .story-progress.light-mode {
  background: rgba(255,255,255,.50);
}
.deck { perspective: 1600px; }
.slide .slide-inner {
  transition: opacity .55s ease, transform .75s cubic-bezier(.2,.75,.22,1), filter .55s ease;
}
.slide:not(.is-active) .slide-inner {
  opacity: .35;
  transform: scale(.985) translateY(8px);
  filter: blur(.4px);
}
.slide.is-active .slide-inner {
  opacity: 1;
  transform: scale(1) translateY(0);
  filter: none;
}
.reveal {
  opacity: 0;
  transform: translateY(22px) scale(.985);
  filter: blur(4px);
  transition: opacity .72s ease, transform .78s cubic-bezier(.2,.75,.22,1), filter .72s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0) scale(1);
  filter: blur(0);
}
.kpi-card, .analysis-card, .bullet-card, .road-card, .mode-card, .compare-card, .quote-card, .summary-card {
  transform-origin: center;
  transition: transform .28s ease, box-shadow .28s ease, border-color .28s ease;
}
.kpi-card:hover, .analysis-card:hover, .bullet-card:hover, .road-card:hover, .mode-card:hover, .compare-card:hover, .quote-card:hover, .summary-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 22px 58px rgba(3,10,20,.18);
}
.theme-dark .kpi-card:hover,
.theme-dark .compare-card:hover,
.theme-dark .mode-card:hover,
.theme-dark .summary-card:hover {
  box-shadow: 0 24px 70px rgba(0,0,0,.26), 0 0 0 1px rgba(121,255,212,.12) inset;
}
.count-up { font-variant-numeric: tabular-nums; }
.big-number b { font: inherit; }
.count-up.pulsed {
  animation: numberPulse .9s cubic-bezier(.2,.75,.22,1);
}
@keyframes numberPulse {
  0% { transform: scale(.92); filter: brightness(.9); }
  55% { transform: scale(1.04); filter: brightness(1.16); }
  100% { transform: scale(1); filter: brightness(1); }
}
.ethernet-story {
  display: grid;
  grid-template-columns: 1fr 90px 1fr 90px 1fr;
  gap: 12px;
  align-items: center;
  margin: 14px 0 18px;
}
.signal-node {
  min-height: 92px;
  border-radius: 22px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,.05);
  display: grid;
  grid-template-columns: 54px 1fr;
  grid-template-rows: auto auto;
  align-items: center;
  column-gap: 14px;
  padding: 16px;
}
.signal-node span {
  grid-row: 1 / span 2;
  width: 54px;
  height: 54px;
  border-radius: 18px;
  position: relative;
  display: block;
}
.signal-node strong { font-size: 18px; }
.signal-node small { color: var(--muted); margin-top: 3px; }
.signal-node.wifi-bad span { background: radial-gradient(circle, #ffb86b 0 18%, transparent 19%), rgba(255,184,107,.12); }
.signal-node.ethernet-good span { background: linear-gradient(135deg, rgba(107,179,255,.85), rgba(121,255,212,.75)); }
.signal-node.wifi-good span { background: radial-gradient(circle, #79ffd4 0 18%, transparent 19%), rgba(121,255,212,.13); }
.signal-node.wifi-bad span::before,
.signal-node.wifi-good span::before {
  content: "";
  position: absolute;
  inset: 10px;
  border-radius: 50%;
  border: 4px solid currentColor;
  border-left-color: transparent;
  border-bottom-color: transparent;
  transform: rotate(-45deg);
  color: #ffb86b;
  animation: wifiPulse 1.5s ease-in-out infinite;
}
.signal-node.wifi-good span::before { color: #79ffd4; animation-duration: 2.1s; }
.signal-node.ethernet-good span::before {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  top: 25px;
  height: 5px;
  border-radius: 999px;
  background: #061629;
  box-shadow: 0 -12px 0 rgba(6,22,41,.72), 0 12px 0 rgba(6,22,41,.72);
}
@keyframes wifiPulse {
  0%,100% { opacity: .55; transform: rotate(-45deg) scale(.92); }
  50% { opacity: 1; transform: rotate(-45deg) scale(1.06); }
}
.story-link {
  height: 5px;
  border-radius: 999px;
  overflow: hidden;
  position: relative;
  background: rgba(255,255,255,.12);
}
.story-link::after {
  content: "";
  position: absolute;
  inset: 0;
  width: 45%;
  border-radius: inherit;
  animation: packetFlow 1.8s linear infinite;
}
.bad-link::after { background: linear-gradient(90deg, transparent, #ffb86b, transparent); animation-duration: 1.1s; }
.good-link::after { background: linear-gradient(90deg, transparent, var(--accent-2), transparent); }
@keyframes packetFlow {
  from { transform: translateX(-110%); }
  to { transform: translateX(260%); }
}
.transition-caption {
  position: fixed;
  left: 50%;
  bottom: 82px;
  transform: translateX(-50%);
  z-index: 29;
  max-width: min(820px, calc(100vw - 460px));
  padding: 10px 18px;
  border-radius: 999px;
  color: rgba(224,236,255,.88);
  background: rgba(7,17,31,.50);
  border: 1px solid rgba(255,255,255,.10);
  backdrop-filter: blur(12px);
  font-size: 13px;
  line-height: 1.35;
  text-align: center;
  opacity: .78;
  transition: opacity .25s ease, transform .25s ease;
}
.transition-caption.light {
  background: rgba(255,255,255,.66);
  color: #2a3e5d;
  border-color: rgba(14,31,53,.10);
}
.transition-caption.flash {
  opacity: 1;
  transform: translateX(-50%) translateY(-3px);
}
.controls { bottom: 18px; }
.slide-roadmap .note-banner { margin-bottom: 46px; }
.final-slide .slide-inner { padding-bottom: 42px; }
.overview-panel { max-height: 82vh; padding: 24px; }
.overview-grid { grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.overview-item { padding: 16px; min-height: 132px; color: #eaf2ff; text-align: left; }
.overview-item strong { color: #ffffff; font-size: 17px; }
.overview-item p { color: #c4d3ea; font-size: 13px; }
.overview-header h2 { color: #f2f7ff; }
@media (max-width: 1400px) {
  .story-progress { display: none; }
  .transition-caption { display: none; }
  .overview-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .ethernet-story { grid-template-columns: 1fr 50px 1fr 50px 1fr; }
}
@media (max-width: 1100px) {
  .story-progress, .transition-caption { display: none; }
  .slide:not(.is-active) .slide-inner { opacity: 1; transform: none; filter: none; }
  .ethernet-story { grid-template-columns: 1fr; }
  .story-link { height: 34px; width: 5px; margin: 0 auto; }
  .story-link::after { width: 100%; height: 45%; animation-name: packetFlowY; }
}
@keyframes packetFlowY {
  from { transform: translateY(-110%); }
  to { transform: translateY(260%); }
}

/* v6 — immersion sonore et apparition progressive */
.sound-btn.active,
.narrate-btn.active,
.guided-btn.active {
  background: linear-gradient(135deg, rgba(121,255,212,.20), rgba(107,179,255,.22));
  border-color: rgba(121,255,212,.45);
  color: #ffffff;
  box-shadow: 0 0 0 3px rgba(121,255,212,.10), 0 10px 28px rgba(0,0,0,.18);
}
.sound-toast {
  position: fixed;
  top: 92px;
  right: 24px;
  width: min(420px, calc(100vw - 48px));
  z-index: 60;
  display: grid;
  gap: 5px;
  padding: 16px 18px;
  border-radius: 20px;
  color: #ecf6ff;
  background: rgba(7, 17, 31, .88);
  border: 1px solid rgba(121,255,212,.22);
  box-shadow: 0 22px 60px rgba(0,0,0,.34);
  backdrop-filter: blur(18px);
  opacity: 0;
  transform: translateY(-10px) scale(.98);
  pointer-events: none;
  transition: opacity .45s ease, transform .45s ease;
}
.sound-toast.show {
  opacity: 1;
  transform: translateY(0) scale(1);
}
.sound-toast strong {
  font-size: 14px;
  letter-spacing: -.01em;
}
.sound-toast span {
  color: var(--muted);
  line-height: 1.45;
  font-size: 13px;
}
.audio-hint {
  margin-top: 18px;
  display: inline-flex;
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(121,255,212,.08);
  border: 1px solid rgba(121,255,212,.18);
  color: #dffdf5;
  font-size: 13px;
  font-weight: 700;
}
.stage-item {
  opacity: 0;
  transform: translate3d(0, 16px, 0) scale(.992);
  filter: blur(3px);
  transition:
    opacity .75s cubic-bezier(.2,.75,.2,1),
    transform .75s cubic-bezier(.2,.75,.2,1),
    filter .75s ease;
  will-change: opacity, transform, filter;
}
.stage-item.stage-visible {
  opacity: 1;
  transform: translate3d(0, 0, 0) scale(1);
  filter: blur(0);
}
.image-frame.stage-item {
  transform: translate3d(18px, 0, 0) scale(.985);
}
.image-frame.stage-item.stage-visible {
  transform: translate3d(0, 0, 0) scale(1);
}
.kpi-card.stage-item,
.analysis-card.stage-item,
.bullet-card.stage-item,
.road-card.stage-item,
.compare-card.stage-item,
.mode-card.stage-item {
  transform: translate3d(0, 22px, 0) scale(.985);
}
.kpi-card.stage-item.stage-visible,
.analysis-card.stage-item.stage-visible,
.bullet-card.stage-item.stage-visible,
.road-card.stage-item.stage-visible,
.compare-card.stage-item.stage-visible,
.mode-card.stage-item.stage-visible {
  transform: translate3d(0, 0, 0) scale(1);
}
.slide.is-active .image-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 4;
  pointer-events: none;
  background: linear-gradient(110deg, transparent 0%, rgba(255,255,255,.14) 38%, transparent 58%);
  transform: translateX(-120%);
  animation: imageSweep 1.8s ease .7s 1;
}
@keyframes imageSweep {
  from { transform: translateX(-120%); }
  to { transform: translateX(120%); }
}
.slide.is-active .hero-copy h1 span,
.slide.is-active h2 {
  text-shadow: 0 0 24px rgba(107,179,255,.12);
}
@media (prefers-reduced-motion: reduce) {
  .stage-item, .reveal, .deck, .image-frame.stage-item, .kpi-card.stage-item,
  .analysis-card.stage-item, .bullet-card.stage-item, .road-card.stage-item,
  .compare-card.stage-item, .mode-card.stage-item {
    transition: none !important;
    transform: none !important;
    filter: none !important;
    opacity: 1 !important;
  }
  .slide.is-active .image-frame::before { display: none; }
}
@media (max-width: 1280px) {
  .topbar-actions { gap: 6px; }
  .ghost-btn, .primary-btn { padding: 9px 12px; font-size: 13px; }
}
@media (max-width: 1100px) {
  .sound-toast { top: 18px; right: 18px; }
  .audio-hint { display: none; }
}