:root {
  --ink: #07172b;
  --ink-soft: #132b47;
  --blue: #1f62f3;
  --blue-soft: #dce8ff;
  --teal: #16998d;
  --teal-soft: #dff5f1;
  --gold: #c89a42;
  --gold-soft: #f8eed9;
  --paper: #f4f7fb;
  --white: #ffffff;
  --line: #cad5e2;
  --muted: #607086;
  --display: "Trebuchet MS", Arial, sans-serif;
  --body: Arial, Helvetica, sans-serif;
  --mono: "SFMono-Regular", Consolas, monospace;
  --max-width: 1240px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body {
  margin: 0;
  overflow-x: hidden;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--body);
  line-height: 1.55;
}
a { color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { font: inherit; }

.skip-link {
  position: fixed;
  top: -80px;
  left: 20px;
  z-index: 100;
  padding: 10px 14px;
  background: var(--white);
  border-radius: 8px;
}
.skip-link:focus { top: 16px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 28px;
  align-items: center;
  min-height: 68px;
  padding: 10px clamp(20px, 4vw, 64px);
  color: var(--white);
  background: rgba(7, 23, 43, 0.94);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid rgba(255,255,255,0.12);
}
.brand { display: flex; gap: 10px; align-items: center; text-decoration: none; font-weight: 700; }
.brand-mark { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 10px; color: var(--ink); background: var(--white); font-size: 13px; }
.site-nav { display: flex; justify-content: center; gap: 26px; }
.site-nav a { color: #cbd6e5; text-decoration: none; font-size: 14px; }
.site-nav a:hover, .site-nav a.is-active { color: var(--white); }
.mode-button { padding: 10px 14px; color: var(--white); background: transparent; border: 1px solid rgba(255,255,255,0.35); border-radius: 999px; cursor: pointer; }
.mode-button:hover { background: rgba(255,255,255,0.08); }
.mobile-nav { display: none; }
.presentation-controls { display: none; }

.story-section { position: relative; padding: clamp(84px, 9vw, 140px) clamp(24px, 6vw, 92px); }
.story-section > * { width: min(100%, var(--max-width)); margin-inline: auto; }
.eyebrow { margin: 0 0 16px; color: var(--blue); font: 700 12px/1 var(--mono); letter-spacing: 0.13em; text-transform: uppercase; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3 { font-family: var(--display); line-height: 1.05; }
h1 { max-width: 840px; margin-bottom: 24px; font-size: clamp(48px, 6.5vw, 92px); letter-spacing: -0.055em; }
h2 { margin-bottom: 22px; font-size: clamp(38px, 4.6vw, 68px); letter-spacing: -0.045em; }
h3 { font-size: clamp(22px, 2.4vw, 32px); }
.section-lead, .section-heading > p, .hero-lead { color: var(--muted); font-size: clamp(18px, 1.8vw, 23px); }
.section-heading { max-width: 880px; margin-bottom: 52px; }

.hero {
  min-height: calc(100vh - 68px);
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(440px, 1.08fr);
  align-items: center;
  gap: clamp(46px, 7vw, 100px);
  color: var(--white);
  background:
    linear-gradient(90deg, rgba(31,98,243,0.16) 1px, transparent 1px) 0 0 / 88px 88px,
    linear-gradient(rgba(31,98,243,0.13) 1px, transparent 1px) 0 0 / 88px 88px,
    var(--ink);
}
.hero > * { width: auto; margin: 0; }
.hero .eyebrow { color: #77a4ff; }
.hero-lead { max-width: 680px; color: #c4d2e3; }
.primary-action { padding: 13px 18px; color: var(--white); background: var(--blue); border-radius: 10px; text-decoration: none; font-weight: 700; }
.text-action { color: #c9d8eb; text-underline-offset: 5px; }
.hero-stage { overflow: hidden; border: 1px solid rgba(255,255,255,0.18); border-radius: 24px; background: rgba(255,255,255,0.06); box-shadow: 0 30px 80px rgba(0,0,0,0.3); }
.stage-tabs { display: flex; gap: 6px; padding: 14px; border-bottom: 1px solid rgba(255,255,255,0.12); }
.stage-tab { padding: 9px 12px; color: #aebfd3; background: transparent; border: 0; border-radius: 8px; cursor: pointer; }
.stage-tab.is-active { color: var(--white); background: rgba(255,255,255,0.12); }
.stage-screen { min-height: 520px; display: grid; grid-template-rows: auto 1fr; gap: 34px; padding: 34px; }
.stage-kicker { color: #7fb6ff; font: 700 11px var(--mono); letter-spacing: 0.1em; }
.stage-screen h2 { max-width: 520px; margin: 10px 0 14px; font-size: clamp(32px, 3.2vw, 52px); }
.stage-screen p { max-width: 520px; color: #bfcde0; }
.stage-placeholder { display: grid; place-items: center; min-height: 250px; padding: 34px; color: #9fb1c8; background: rgba(2,12,25,0.42); border: 1px dashed rgba(255,255,255,0.28); border-radius: 18px; text-align: center; }

.product-definition { background: var(--white); }
.platform-stack { display: grid; gap: 0; }
.platform-stack-layer, .platform-foundation-layer { padding: 16px 22px 18px; border: 1px solid var(--line); }
.platform-stack-layer > header, .platform-foundation-layer > header { display: flex; align-items: baseline; justify-content: space-between; gap: 20px; margin-bottom: 13px; }
.platform-stack-layer > header span, .platform-foundation-layer > header span { color: var(--blue); font: 700 10px/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; }
.platform-stack-layer > header strong, .platform-foundation-layer > header strong { font: 700 15px/1.2 var(--display); }
.platform-user-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.platform-user-grid article { min-width: 0; padding-top: 12px; border-top: 3px solid var(--blue); }
.platform-user-grid article > div { display: flex; align-items: center; justify-content: space-between; gap: 10px; }
.platform-user-grid article > div span { color: var(--blue); font: 700 10px/1 var(--mono); letter-spacing: 0.07em; text-transform: uppercase; }
.platform-user-grid em { padding: 4px 7px; color: #315eae; background: var(--blue-soft); border-radius: 999px; font: 700 8px/1 var(--mono); font-style: normal; letter-spacing: 0.04em; text-transform: uppercase; }
.platform-user-grid h3 { margin: 15px 0 6px; font-size: 21px; }
.platform-user-grid p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.4; }
.platform-user-grid .platform-school-value { border-top-color: var(--gold); }
.platform-user-grid .platform-school-value > div span { color: #98660c; }
.platform-school-value em { color: #7a5410; background: var(--gold-soft); }
.platform-stack-connector { position: relative; display: grid; place-items: center; height: 27px; }
.platform-stack-connector::before { content: ""; position: absolute; top: 0; bottom: 0; width: 2px; background: var(--blue); }
.platform-stack-connector::after { content: ""; position: absolute; bottom: 0; width: 8px; height: 8px; border-right: 2px solid var(--blue); border-bottom: 2px solid var(--blue); transform: rotate(45deg); }
.platform-stack-connector span { position: relative; z-index: 1; padding: 3px 9px; color: var(--muted); background: var(--white); font: 700 8px/1 var(--mono); letter-spacing: 0.05em; text-transform: uppercase; }
.platform-experience-layer { background: #edf3fb; }
.platform-experience-grid { display: grid; grid-template-columns: minmax(0, 1fr) 118px minmax(0, 1fr); gap: 14px; align-items: stretch; }
.platform-experience-grid article { min-width: 0; padding: 13px 17px; background: var(--white); border: 1px solid var(--line); }
.platform-experience-grid article > span { color: var(--blue); font: 700 9px/1 var(--mono); letter-spacing: 0.07em; text-transform: uppercase; }
.platform-experience-grid h3 { margin: 11px 0 5px; font-size: 20px; }
.platform-experience-grid p { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.4; }
.platform-experience-bridge { display: grid; place-content: center; padding: 8px; color: var(--white); background: var(--ink); border-radius: 18px; text-align: center; }
.platform-experience-bridge b { color: #82aaff; font-size: 24px; line-height: 1; }
.platform-experience-bridge span { margin-top: 7px; color: #c1cfe1; font-size: 9px; line-height: 1.45; }
.platform-phase-note { margin: 9px 0 0; color: var(--muted); font-size: 10px; text-align: center; }
.platform-foundation-layer { color: var(--white); background: var(--ink); border-color: var(--ink); }
.platform-foundation-layer > header span { color: #82aaff; }
.platform-foundation-layer > header strong { color: var(--white); }
.platform-foundation-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); }
.platform-foundation-grid article { min-width: 0; padding: 8px 15px; border-left: 1px solid rgba(255,255,255,0.16); }
.platform-foundation-grid article:first-child { border-left: 0; }
.platform-foundation-grid strong { display: block; font: 700 15px/1.15 var(--display); }
.platform-foundation-grid span { display: block; margin-top: 5px; color: #b9c8dc; font-size: 11px; }

.course-scale-story { background: var(--paper); }
.course-scale-map { display: grid; justify-items: center; }
.course-source { width: min(100%, 540px); padding: 16px 24px; background: var(--white); border: 1px solid var(--line); border-top: 4px solid var(--blue); text-align: center; }
.course-source span { display: block; color: var(--blue); font: 700 11px/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; }
.course-source strong { display: block; margin-top: 10px; font: 700 19px/1.2 var(--display); }
.course-engine { width: min(100%, 650px); margin-top: 14px; padding: 18px 28px; color: var(--white); background: var(--ink); border-radius: 22px; text-align: center; }
.course-engine small { color: #82aaff; font: 700 10px/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; }
.course-engine strong { display: block; margin: 8px 0 4px; font: 700 25px/1.05 var(--display); }
.course-engine p { margin: 0; color: #bdcce0; font-size: 13px; }
.course-fan-lines { width: min(100%, 1100px); height: 72px; fill: none; stroke: #7ea6e6; stroke-width: 2; stroke-dasharray: 7 7; }
.learner-paths { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 12px; width: 100%; }
.learner-paths article { min-width: 0; padding: 15px 16px 17px; background: var(--white); border-top: 4px solid var(--blue); }
.learner-paths i { display: block; color: var(--blue); font: 700 10px/1 var(--mono); font-style: normal; }
.learner-paths strong { display: block; margin: 18px 0 6px; font: 700 17px/1.15 var(--display); }
.learner-paths span { display: block; color: var(--muted); font-size: 12px; line-height: 1.4; }
.course-scale-note { display: flex; justify-content: center; gap: 10px 24px; margin-top: 20px; color: var(--muted); text-align: center; }
.course-scale-note strong { color: var(--ink); }

.learner-overview { background: var(--paper); }
.learner-overview-stage { display: grid; grid-template-columns: minmax(320px, 0.78fr) minmax(440px, 1.22fr); gap: 48px; align-items: start; }
.learner-overview-stage > * { width: auto; margin: 0; }
.learner-overview-stage .outcome-list { margin-top: 0; }
.outcome-list { list-style: none; margin: 34px 0 0; padding: 0; border-top: 1px solid var(--line); }
.outcome-list li { display: grid; grid-template-columns: 150px 1fr; gap: 18px; padding: 18px 0; border-bottom: 1px solid var(--line); }
.outcome-list span { color: var(--muted); }
.media-sequence { display: grid; gap: 22px; }
.media-placeholder { margin: 0; overflow: hidden; background: var(--white); border: 1px solid var(--line); border-radius: 18px; }
.media-placeholder > div { min-height: 320px; display: grid; place-items: center; padding: 28px; color: #75879d; background: linear-gradient(135deg, #edf3fb, #f9fbfd); border-bottom: 1px dashed var(--line); text-align: center; }
.media-placeholder figcaption { padding: 14px 18px; color: var(--muted); font-size: 13px; }
.teacher-create { background: var(--white); }
.course-creation-modes { display: grid; grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr); gap: 18px; }
.course-creation-mode { min-width: 0; padding: 22px; background: var(--paper); border: 1px solid var(--line); border-radius: 20px; }
.course-creation-mobile { display: grid; grid-template-columns: minmax(150px, 0.82fr) minmax(180px, 1fr); gap: 20px; align-items: center; }
.course-mode-copy span { color: var(--blue); font: 700 11px/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; }
.course-mode-copy h3 { margin: 16px 0 10px; font-size: clamp(22px, 2.2vw, 30px); }
.course-mode-copy p { margin: 0; color: var(--muted); }
.course-mode-copy .youtube-action { margin-top: 18px; }
.course-creation-mobile .phone-frame img { height: 340px; }
.course-creation-web .course-mode-copy { margin-bottom: 18px; }
.course-creation-web .product-shot img { height: 310px; aspect-ratio: auto; object-fit: cover; object-position: top; }
.media-wide > div { min-height: 560px; }

.agent-story { color: var(--white); background: var(--ink-soft); }
.section-heading-light > p { color: #bccadd; }
.agent-sequence { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2px; overflow: hidden; border-radius: 18px; background: rgba(255,255,255,0.12); }
.agent-sequence article { min-height: 230px; padding: 30px; background: #10263f; }
.agent-sequence span { color: #7ca9ff; font: 700 12px var(--mono); text-transform: uppercase; }
.agent-sequence p { margin-top: 52px; font-size: 20px; }
.future-video-slot { margin-top: 26px; padding: 18px; color: #a9bbd1; border: 1px dashed rgba(255,255,255,0.28); border-radius: 14px; text-align: center; }

.management { background: #edf5f4; }
.management-flow { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.management-flow article { padding: 28px; background: var(--white); border-top: 4px solid var(--teal); }
.management-flow span { color: var(--teal); font: 700 12px var(--mono); text-transform: uppercase; }
.management-flow p { margin-top: 42px; color: var(--muted); }

.admin-story { background: var(--white); }
.admin-overview-stage .compact-list { margin-top: 22px; }
.compact-list { margin: 30px 0 0; padding-left: 20px; color: var(--muted); }
.compact-list li { margin: 10px 0; }
.admin-console { display: grid; grid-template-columns: 180px 1fr; overflow: hidden; min-height: 450px; border: 1px solid var(--line); border-radius: 20px; box-shadow: 0 24px 60px rgba(17,40,68,0.12); }
.admin-console aside { display: flex; flex-direction: column; gap: 8px; padding: 25px 18px; color: #bed0df; background: #0b3040; }
.admin-console aside strong { margin-bottom: 22px; color: var(--white); }
.admin-console aside span { padding: 10px; border-radius: 8px; }
.admin-console aside .is-selected { color: var(--white); background: rgba(255,255,255,0.12); }
.console-main { padding: 28px; background: #f5f8fb; }
.console-topline { display: flex; justify-content: space-between; margin-bottom: 28px; }
.console-topline span { color: var(--teal); }
.capability-row { display: grid; grid-template-columns: 1fr 0.8fr auto; gap: 16px; align-items: center; padding: 20px 0; border-bottom: 1px solid var(--line); }
.capability-row b { color: var(--muted); font-weight: 400; }
.capability-row i { padding: 6px 9px; color: #086056; background: var(--teal-soft); border-radius: 999px; font-style: normal; font-size: 12px; }

.integration { background: var(--paper); }
.integration-map { display: grid; grid-template-columns: 0.8fr 1.1fr 0.9fr; gap: 28px; align-items: stretch; }
.system-stack, .deployment-stack { display: grid; gap: 10px; }
.system-stack span, .deployment-stack article { display: flex; flex-direction: column; justify-content: center; min-height: 68px; padding: 14px 18px; background: var(--white); border: 1px solid var(--line); }
.connection-core { display: grid; place-items: center; padding: 30px; color: var(--white); background: var(--ink); border-radius: 18px; text-align: center; }
.connection-core span { color: #83adff; font: 700 11px var(--mono); text-transform: uppercase; }
.connection-core strong { font: 700 clamp(34px, 4vw, 58px) var(--display); }
.connection-core small { color: #b6c6d9; }
.deployment-stack article { border-left: 4px solid var(--gold); }
.deployment-stack span { margin-top: 6px; color: var(--muted); font-size: 14px; }

.impact-story { background: var(--white); }
.impact-metrics { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.impact-metric { min-width: 0; overflow: hidden; background: var(--paper); border: 1px solid var(--line); border-radius: 20px; }
.impact-metric-head { min-height: 176px; padding: 26px 28px; color: var(--white); background: var(--ink); }
.impact-metric-head strong { display: block; margin-bottom: 18px; color: #7faaff; font: 700 clamp(52px, 5vw, 76px)/0.9 var(--display); letter-spacing: -0.05em; }
.impact-metric-head h3 { margin: 0; font-size: clamp(21px, 2vw, 27px); }
.metric-comparison { display: grid; grid-template-columns: 1fr 1fr; }
.metric-comparison > div { min-width: 0; padding: 18px 20px 21px; }
.metric-comparison > div + div { border-left: 1px solid var(--line); }
.metric-comparison span { display: block; min-height: 28px; margin-bottom: 8px; color: var(--muted); font: 700 10px/1.35 var(--mono); letter-spacing: 0.05em; text-transform: uppercase; }
.metric-comparison b { display: block; font: 700 clamp(20px, 2vw, 27px)/1.05 var(--display); }
.metric-comparison .is-shifu { color: var(--blue); background: var(--blue-soft); }
.metric-comparison .is-shifu span { color: #315eae; }
.data-note { margin-top: 18px; color: var(--muted); font-size: 13px; }

.operations-story { color: var(--white); background: var(--ink); }
.operations-story .section-heading > p { color: #bccadd; }
.operations-stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 2px; overflow: hidden; background: rgba(255,255,255,0.14); border-radius: 20px; }
.operations-stats article { position: relative; min-width: 0; min-height: 250px; padding: 28px; background: var(--ink-soft); }
.operations-stats article::after { content: ""; position: absolute; inset: auto 0 0; height: 6px; background: var(--blue); }
.operations-stats small { display: block; color: #7faaff; font: 700 11px/1 var(--mono); }
.operations-stats strong { display: block; margin: 58px 0 18px; font: 700 clamp(42px, 4.2vw, 64px)/0.92 var(--display); letter-spacing: -0.05em; }
.operations-stats span { color: #c7d5e6; font-size: 18px; }
.operations-note { margin-top: 20px; color: #92a7c0; font: 700 11px/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; }

.cases { background: #edf5f4; }
.case-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.case-pair article { padding: clamp(28px, 4vw, 52px); background: var(--white); border-radius: 18px; }
.case-pair article > span { color: var(--teal); font: 700 11px var(--mono); text-transform: uppercase; }
.case-pair h3 { margin: 26px 0 12px; font-size: clamp(30px, 3.1vw, 44px); letter-spacing: -0.035em; }
.case-pair h4 { margin: 0 0 18px; color: var(--teal); font: 700 clamp(17px, 1.6vw, 21px)/1.2 var(--display); }
.case-pair p { color: var(--muted); }

.closing { color: var(--white); background: var(--ink); }
.closing .eyebrow { color: #75a4ff; }
.closing .section-heading { margin-bottom: 0; }
.closing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin-top: 56px; background: rgba(255,255,255,0.15); }
.closing-grid article { padding: 30px; background: var(--ink); }
.closing-grid p { color: #b9c8db; }
.final-statement { display: flex; flex-wrap: wrap; gap: 12px 28px; margin-top: 70px; font: 700 clamp(28px, 4vw, 54px) var(--display); }
.final-statement span:nth-child(2) { color: #7ba8ff; }
.final-statement span:nth-child(3) { color: #7ed1c6; }

.chapter-label { margin: 12px 0 16px; color: var(--blue); font: 700 11px/1 var(--mono); letter-spacing: 0.1em; text-transform: uppercase; }
.agent-story .chapter-label, .language-story .chapter-label, .closing .chapter-label { color: #7faaff; }
.cover-section { grid-template-columns: 1fr; }
.cover-section .hero-copy { max-width: 1120px; }
.cover-section h1 { max-width: 1100px; margin-bottom: 32px; font-size: clamp(72px, 9vw, 136px); line-height: 0.94; }
.cover-statement { max-width: 920px; color: #c4d2e3; font-size: clamp(22px, 2.3vw, 32px); line-height: 1.45; }
.agenda { background: var(--white); }
.agenda-grid { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid var(--line); }
.agenda-grid a { display: flex; flex-direction: column; gap: 8px; min-height: 140px; padding: 28px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); text-decoration: none; }
.agenda-grid a:nth-child(even) { border-right: 0; }
.agenda-grid a:hover { background: var(--paper); }
.agenda-grid strong { font: 700 24px/1.15 var(--display); }
.agenda-grid span { color: var(--muted); }
.storyboard-three, .data-evidence { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.storyboard-three article, .data-evidence article { padding: 28px; background: var(--white); border-top: 4px solid var(--blue); }
.storyboard-three span { color: var(--blue); font: 700 11px/1 var(--mono); text-transform: uppercase; }
.storyboard-three strong, .data-evidence strong { display: block; margin: 34px 0 12px; font: 700 22px/1.15 var(--display); }
.storyboard-three p, .data-evidence p { color: var(--muted); }
.boundary-note { margin-top: 22px; color: var(--muted); font-size: 13px; }
.two-panel { background: var(--white); }
.question-flow { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 18px; }
.question-flow blockquote { margin: 0; padding: 34px; color: var(--white); background: var(--blue); border-radius: 18px; font: 700 28px/1.25 var(--display); }
.question-flow > div { padding: 28px; background: var(--paper); border: 1px solid var(--line); border-radius: 18px; }
.question-flow p { color: var(--muted); }
.language-story { color: var(--white); background: var(--ink-soft); }
.language-story .section-heading > p, .language-story .boundary-note { color: #bccadd; }
.listen-mode-gallery { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.listen-mode-gallery figure { min-width: 0; margin: 0; }
.multilingual-story { background: var(--paper); }
.language-adaptation-map { display: grid; gap: 14px; width: min(100%, 1040px); margin-inline: auto; }
.course-foundation, .language-output { display: grid; grid-template-columns: minmax(260px, 0.76fr) minmax(0, 1.24fr); gap: 32px; align-items: center; padding: 18px 24px; background: var(--white); border: 1px solid var(--line); border-radius: 18px; }
.language-step-copy > span { color: var(--blue); font: 700 11px/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; }
.language-step-copy h3 { margin: 9px 0 6px; }
.language-step-copy p { margin: 0; color: var(--muted); }
.course-lines { display: grid; gap: 8px; margin: 0; }
.course-lines i { display: block; width: 100%; height: 9px; background: #dce4ef; border-radius: 999px; }
.course-lines i:nth-child(2) { width: 82%; }
.course-lines i:nth-child(3) { width: 66%; }
.course-lines i:nth-child(4) { width: 44%; background: var(--blue-soft); }
.language-engine { position: relative; justify-self: center; display: grid; grid-template-columns: auto auto minmax(260px, 1fr); gap: 18px; align-items: center; width: min(78%, 760px); min-height: 94px; padding: 18px 28px; color: var(--white); background: var(--blue); border-radius: 48px; box-shadow: 0 18px 42px rgba(31,98,243,0.22); }
.language-engine::before, .language-engine::after { content: ""; position: absolute; left: 50%; width: 2px; height: 16px; background: var(--blue); transform: translateX(-50%); }
.language-engine::before { top: -15px; }
.language-engine::after { bottom: -15px; }
.language-engine small { font: 700 10px/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; }
.language-engine strong { font: 700 28px/1 var(--display); }
.language-engine p { margin: 0; font-size: 13px; }
.language-pills { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 9px; margin: 0; }
.language-pills b { padding: 9px 13px; color: var(--ink); background: var(--paper); border: 1px solid var(--line); border-radius: 999px; font-size: 13px; }
.language-adaptation-note { margin-top: 16px; color: var(--muted); text-align: center; font: 700 12px/1 var(--mono); letter-spacing: 0.06em; text-transform: uppercase; }
.data-story { background: var(--white); }
.data-evidence article { background: var(--paper); border-top-color: var(--teal); }
.data-placeholder { margin-top: 22px; }
.data-placeholder > div { min-height: 250px; }
.dual-data-view { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.dual-data-view > article { min-height: 370px; padding: 28px; border: 1px solid var(--line); border-radius: 18px; }
.dual-data-view > article > span { color: var(--teal); font: 700 11px/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; }
.dual-data-view h3 { margin: 34px 0 20px; }
.dual-data-view ul { margin: 20px 0 0; padding-left: 20px; color: var(--muted); }
.dual-data-view li { margin: 8px 0; }
.data-dashboard { background: var(--paper); }
.data-conversation { color: var(--white); background: var(--ink-soft); border-color: var(--ink-soft) !important; }
.data-conversation > span { color: #7faaff !important; }
.data-conversation blockquote { margin: 0 0 20px; padding: 18px; color: var(--white); background: var(--blue); border-radius: 14px 14px 4px 14px; font: 700 18px/1.35 var(--display); }
.data-conversation p { color: #bdcce0; }
.improvement-story { background: #edf5f4; }
.improvement-cycle { position: relative; width: min(100%, 1100px); height: 350px; margin-inline: auto; }
.cycle-ring { position: absolute; inset: 44px 168px; border: 3px solid #9bcfc7; border-radius: 50%; }
.cycle-center { position: absolute; top: 50%; left: 50%; z-index: 2; display: grid; place-items: center; gap: 8px; width: 230px; min-height: 100px; padding: 16px; color: var(--white); background: var(--teal); border-radius: 50px; text-align: center; transform: translate(-50%, -50%); box-shadow: 0 18px 42px rgba(22,153,141,0.24); }
.cycle-center strong { font: 700 20px/1.05 var(--display); }
.cycle-center span { font: 700 10px/1.3 var(--mono); letter-spacing: 0.06em; text-transform: uppercase; }
.cycle-step { position: absolute; z-index: 3; width: 230px; min-height: 94px; padding: 14px 16px; background: var(--white); border: 1px solid var(--line); border-top: 4px solid var(--teal); border-radius: 14px; box-shadow: 0 12px 30px rgba(17,40,68,0.08); }
.cycle-step span { color: var(--teal); font: 700 10px/1 var(--mono); }
.cycle-step strong { display: block; margin: 10px 0 5px; font: 700 19px/1.05 var(--display); }
.cycle-step p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.35; }
.cycle-teach { top: 0; left: 50%; transform: translateX(-50%); }
.cycle-measure { top: 50%; right: 0; transform: translateY(-50%); }
.cycle-improve { bottom: 0; left: 50%; transform: translateX(-50%); }
.cycle-approve { top: 50%; left: 0; transform: translateY(-50%); }
.cycle-arrow { position: absolute; z-index: 4; color: var(--blue); font: 700 34px/1 var(--display); font-style: normal; }
.cycle-arrow-one { top: 54px; right: 274px; }
.cycle-arrow-two { right: 274px; bottom: 54px; }
.cycle-arrow-three { bottom: 54px; left: 274px; }
.cycle-arrow-four { top: 54px; left: 274px; }
.dashboard-metrics { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 20px; }
.dashboard-metrics span { display: flex; flex-direction: column; gap: 12px; padding: 16px; background: var(--white); border: 1px solid var(--line); border-radius: 12px; }
.dashboard-metrics b { color: var(--muted); font-size: 12px; }
.dashboard-metrics strong { font-size: 24px; }
.access-story { background: var(--paper); }
.access-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; }
.access-grid article { padding: 24px; background: var(--white); border-bottom: 4px solid var(--blue); }
.access-grid strong { font: 700 22px var(--display); }
.access-grid p { color: var(--muted); }
.ecosystem-story { background: var(--white); }
.ecosystem-map { display: grid; grid-template-columns: 1fr 220px 1fr; gap: 20px; align-items: stretch; }
.ecosystem-map > div:not(.ecosystem-arrow) { display: grid; gap: 9px; padding: 26px; background: var(--paper); border: 1px solid var(--line); border-radius: 16px; }
.ecosystem-map span { margin-bottom: 12px; color: var(--blue); font: 700 11px/1 var(--mono); text-transform: uppercase; }
.ecosystem-zone p { color: var(--muted); }
.ecosystem-node-cloud { display: flex; gap: 12px; align-items: center; margin-top: 20px; }
.ecosystem-node-cloud i { display: block; width: 46px; height: 46px; border: 2px solid #9eb3ce; border-radius: 14px; background: var(--white); }
.ecosystem-node-cloud i:nth-child(2), .ecosystem-node-cloud i:nth-child(4) { width: 34px; height: 34px; border-radius: 50%; }
.ecosystem-node-cloud i:nth-child(3) { border-color: var(--blue); background: var(--blue-soft); }
.channel-chips { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.channel-chips strong { padding: 10px 14px; color: var(--ink); background: var(--white); border: 1px solid var(--line); border-radius: 999px; font-size: 13px; }
.ecosystem-arrow { position: relative; display: grid; place-items: center; align-content: center; gap: 16px; padding: 20px; color: var(--muted); border-top: 1px dashed var(--line); border-bottom: 1px dashed var(--line); text-align: center; font-size: 13px; }
.ecosystem-arrow::before, .ecosystem-arrow::after { content: ""; position: absolute; top: 50%; width: 22px; height: 2px; background: var(--blue); }
.ecosystem-arrow::before { left: -20px; }
.ecosystem-arrow::after { right: -20px; }
.integration-hub { display: grid; place-items: center; width: 132px; height: 132px; color: var(--white); background: var(--blue); border-radius: 50%; box-shadow: 0 20px 44px rgba(31,98,243,0.24); }
.integration-hub b { font: 700 30px/1 var(--display); }
.integration-hub strong { font: 700 16px/1 var(--display); }
.ecosystem-arrow p { max-width: 160px; margin: 0; }
.deployment-story { background: var(--paper); }
.deployment-modes { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.deployment-mode {
  position: relative;
  min-width: 0;
  padding: 22px 24px 26px;
  overflow: hidden;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 20px;
}
.deployment-mode::before { content: ""; position: absolute; inset: 0 0 auto; height: 5px; background: var(--blue); }
.deployment-mode-label { display: flex; justify-content: space-between; gap: 16px; align-items: center; color: var(--muted); font: 700 11px/1 var(--mono); letter-spacing: 0.07em; text-transform: uppercase; }
.deployment-mode-label span { color: var(--blue); }
.deployment-mode-label strong { font: inherit; }
.deployment-visual { height: 172px; margin: 18px 0 20px; color: var(--blue); background: #f7f9fd; border: 1px solid #dbe4f0; border-radius: 16px; }
.deployment-visual svg { display: block; width: 100%; height: 100%; }
.deployment-boundary, .deployment-cloud { fill: var(--white); stroke: #9eafc4; stroke-width: 2; stroke-dasharray: 5 5; }
.deployment-link { fill: none; stroke: var(--blue); stroke-width: 3; stroke-linecap: round; }
.deployment-link-bidirectional { stroke-dasharray: 6 6; }
.deployment-endpoint { fill: var(--blue-soft); stroke: var(--blue); stroke-width: 2; }
.deployment-core { fill: var(--blue); }
.deployment-server { fill: var(--white); stroke: var(--ink-soft); stroke-width: 2; }
.deployment-person, .deployment-detail { fill: none; stroke: var(--ink-soft); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.deployment-mark { fill: none; stroke: var(--white); stroke-width: 3; stroke-linecap: round; }
.deployment-mode h3 { margin: 0 0 10px; font-size: clamp(24px, 2.2vw, 30px); }
.deployment-mode p { margin: 0; color: var(--muted); font-size: 16px; line-height: 1.5; }
.deployment-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.deployment-pair article { padding: 38px; background: var(--white); border-left: 5px solid var(--gold); }
.deployment-pair span { color: var(--gold); font: 700 11px/1 var(--mono); text-transform: uppercase; }
.deployment-pair h3 { margin: 38px 0 14px; }
.product-shot { margin: 0; overflow: hidden; color: var(--ink); background: var(--white); border: 1px solid var(--line); border-radius: 18px; box-shadow: 0 18px 44px rgba(17,40,68,0.1); }
.product-shot img { display: block; width: 100%; height: auto; aspect-ratio: 16 / 10; object-fit: contain; object-position: top; background: var(--white); }
.product-shot figcaption { display: flex; justify-content: space-between; gap: 16px; align-items: center; min-height: 46px; padding: 11px 16px; color: var(--muted); background: var(--white); border-top: 1px solid var(--line); font-size: 13px; }
.product-shot-wide { width: min(100%, 1240px); margin-inline: auto; }
.youtube-action { display: inline-flex; align-items: center; min-height: 30px; padding: 6px 10px; color: var(--white); background: #ff0033; border-radius: 999px; text-decoration: none; font: 700 11px/1 var(--mono); letter-spacing: 0.04em; text-transform: uppercase; }
.youtube-action.is-pending { color: var(--muted); background: var(--paper); border: 1px solid var(--line); }
.phone-shot { display: grid; justify-items: center; gap: 9px; min-width: 0; margin: 0; }
.phone-frame { display: grid; place-items: center; padding: 8px; overflow: hidden; background: #10141b; border: 1px solid rgba(255,255,255,0.16); border-radius: 38px; box-shadow: 0 24px 62px rgba(7,23,43,0.22); }
.phone-frame img { display: block; width: auto; height: min(59vh, 570px); max-width: 100%; border-radius: 30px; background: var(--white); object-fit: contain; }
.phone-shot figcaption { color: var(--muted); font-size: 12px; text-align: center; }
.web-product-stage { display: grid; grid-template-columns: minmax(280px, 0.72fr) minmax(0, 1.28fr); gap: clamp(30px, 5vw, 72px); align-items: center; width: min(100%, 1180px); margin-inline: auto; }
.web-stage-copy h3 { margin: 0 0 14px; font-size: clamp(25px, 3vw, 40px); }
.web-stage-copy > p { color: var(--muted); font-size: 18px; }
.web-product-shot img { object-fit: contain; object-position: top; }
.closing-grid { grid-template-columns: repeat(4, 1fr); }
.thanks { min-height: calc(100vh - 68px); display: grid; place-items: center; color: var(--white); background: var(--ink); text-align: center; }
.thanks > div { max-width: 900px; }
.thanks h2 { font-size: clamp(70px, 10vw, 140px); }
.thanks p { margin-bottom: 36px; color: #bdcce0; font-size: 22px; }
.thanks .primary-action { display: inline-block; }

footer { display: flex; justify-content: space-between; gap: 20px; padding: 24px clamp(24px, 6vw, 92px); color: var(--muted); background: var(--white); font-size: 13px; }

body.presentation { height: 100vh; overflow: hidden; background: var(--ink); }
body.presentation main { position: relative; height: calc(100dvh - 68px); overflow: hidden; }
body.presentation .story-section {
  position: absolute;
  inset: 0;
  display: none;
  width: 100%;
  height: calc(100dvh - 68px);
  min-height: 0;
  padding: clamp(28px, 4vh, 46px) clamp(36px, 5vw, 72px) 76px;
  overflow: hidden;
  align-content: center;
}
body.presentation .story-section.is-presented {
  display: grid;
  animation: page-enter 260ms ease-out both;
}
body.presentation .site-header {
  grid-template-columns: auto auto;
  justify-content: space-between;
}
body.presentation .mode-button { width: auto; justify-self: end; }
body.presentation[data-slide-direction="previous"] .story-section.is-presented {
  animation-name: page-enter-previous;
}
body.presentation .hero { grid-template-columns: minmax(0, 0.92fr) minmax(420px, 1.08fr); gap: 44px; padding-top: 24px; padding-bottom: 66px; }
body.presentation .hero h1 { margin-bottom: 16px; font-size: clamp(42px, 5vw, 64px); }
body.presentation .cover-section { grid-template-columns: 1fr; }
body.presentation .cover-section .hero-copy { max-width: 1120px; }
body.presentation .cover-section h1 { margin-bottom: 28px; font-size: clamp(64px, 7vw, 104px); }
body.presentation h2 { font-size: clamp(34px, 3.8vw, 54px); }
body.presentation .section-heading { margin-bottom: 28px; }
body.presentation .section-heading > p,
body.presentation .section-lead,
body.presentation .hero-lead { font-size: clamp(16px, 1.35vw, 19px); }
body.presentation .stage-screen { min-height: 330px; padding: 24px; }
body.presentation .stage-placeholder { min-height: 150px; }
body.presentation .product-definition .section-heading { margin-bottom: 10px; }
body.presentation .platform-stack-layer, body.presentation .platform-foundation-layer { padding: 10px 18px 12px; }
body.presentation .platform-stack-layer > header, body.presentation .platform-foundation-layer > header { margin-bottom: 10px; }
body.presentation .platform-user-grid h3 { margin-top: 12px; font-size: 19px; }
body.presentation .platform-user-grid p { font-size: 11px; }
body.presentation .platform-stack-connector { height: 19px; }
body.presentation .platform-experience-grid article { padding: 10px 14px; }
body.presentation .platform-experience-grid h3 { margin-top: 8px; font-size: 18px; }
body.presentation .platform-foundation-grid article { padding: 6px 13px; }
body.presentation .course-scale-story .section-heading { margin-bottom: 18px; }
body.presentation .course-source { padding: 12px 20px; }
body.presentation .course-engine { margin-top: 10px; padding: 14px 24px; }
body.presentation .course-fan-lines { height: 58px; }
body.presentation .learner-paths article { padding: 12px 13px 14px; }
body.presentation .learner-paths strong { margin-top: 14px; font-size: 16px; }
body.presentation .course-scale-note { margin-top: 14px; }
body.presentation .learner-overview .section-heading { margin-bottom: 18px; }
body.presentation .learner-overview h2 { font-size: clamp(34px, 3.5vw, 50px); }
body.presentation .learner-overview-stage { grid-template-columns: minmax(300px, 0.85fr) minmax(390px, 1.15fr); gap: 34px; }
body.presentation .learner-overview-stage .product-shot img { max-height: 340px; }
body.presentation .course-creation-mode { padding: 18px; }
body.presentation .course-creation-mobile { grid-template-columns: minmax(140px, 0.78fr) minmax(170px, 1fr); gap: 16px; }
body.presentation .course-mode-copy h3 { margin: 12px 0 8px; font-size: 22px; }
body.presentation .course-mode-copy p { font-size: 14px; line-height: 1.45; }
body.presentation .course-creation-mobile .phone-frame img { height: 270px; }
body.presentation .course-creation-web .course-mode-copy { margin-bottom: 12px; }
body.presentation .course-creation-web .product-shot img { height: 235px; }
body.presentation .outcome-list { margin-top: 20px; }
body.presentation .outcome-list li { padding: 11px 0; }
body.presentation .media-sequence { grid-template-columns: 1fr 1fr; }
body.presentation .media-placeholder > div { min-height: 250px; }
body.presentation .media-wide > div { min-height: 370px; }
body.presentation .agent-sequence article { min-height: 180px; padding: 24px; }
body.presentation .agent-sequence p { margin-top: 28px; font-size: 18px; }
body.presentation .management-flow article { padding: 22px; }
body.presentation .management-flow p { margin-top: 26px; }
body.presentation .admin-console { min-height: 360px; }
body.presentation .integration-map { gap: 18px; }
body.presentation .system-stack span,
body.presentation .deployment-stack article { min-height: 54px; }
body.presentation .impact-metric-head { min-height: 138px; padding: 20px 22px; }
body.presentation .impact-metric-head strong { margin-bottom: 13px; font-size: 52px; }
body.presentation .impact-metric-head h3 { font-size: 20px; }
body.presentation .metric-comparison > div { padding: 14px 16px 16px; }
body.presentation .metric-comparison span { min-height: 24px; font-size: 9px; }
body.presentation .metric-comparison b { font-size: 21px; }
body.presentation .operations-stats article { min-height: 200px; padding: 23px; }
body.presentation .operations-stats strong { margin: 42px 0 14px; font-size: clamp(38px, 3.6vw, 54px); }
body.presentation .operations-stats span { font-size: 16px; }
body.presentation .case-pair article { padding: 30px 34px; }
body.presentation .case-pair h3 { margin-top: 20px; font-size: clamp(28px, 2.8vw, 38px); }
body.presentation .case-pair h4 { margin-bottom: 14px; font-size: 17px; }
body.presentation .closing-grid { margin-top: 34px; }
body.presentation .final-statement { margin-top: 38px; }
body.presentation .agenda-grid a { min-height: 100px; padding: 18px 22px; }
body.presentation .agenda-grid strong { font-size: 19px; }
body.presentation .storyboard-three article,
body.presentation .data-evidence article { padding: 22px; }
body.presentation .storyboard-three strong,
body.presentation .data-evidence strong { margin-top: 22px; font-size: 18px; }
body.presentation .language-story .section-heading { margin-bottom: 18px; }
body.presentation .language-story h2 { font-size: clamp(34px, 3.2vw, 46px); }
body.presentation .multilingual-story .section-heading { margin-bottom: 14px; }
body.presentation .multilingual-story h2 { font-size: clamp(34px, 3.2vw, 46px); }
body.presentation .course-foundation, body.presentation .language-output { padding: 12px 22px; }
body.presentation .course-foundation h3, body.presentation .language-output h3 { margin-top: 8px; font-size: 21px; }
body.presentation .language-step-copy p { font-size: 14px; }
body.presentation .course-lines { margin-top: 0; }
body.presentation .language-engine { min-height: 82px; }
body.presentation .language-pills { margin-top: 0; }
body.presentation .language-adaptation-note { margin-top: 10px; }
body.presentation .dual-data-view > article { min-height: 300px; padding: 22px; }
body.presentation .dual-data-view h3 { margin: 22px 0 14px; font-size: 20px; }
body.presentation .dual-data-view .dashboard-metrics { margin-bottom: 12px; }
body.presentation .dual-data-view li { margin: 4px 0; font-size: 14px; }
body.presentation .data-conversation blockquote { padding: 14px; font-size: 16px; }
body.presentation .question-flow blockquote { padding: 26px; font-size: 23px; }
body.presentation .question-flow > div { padding: 22px; }
body.presentation .access-grid article { padding: 18px; }
body.presentation .access-grid strong { font-size: 18px; }
body.presentation .ecosystem-map > div:not(.ecosystem-arrow) { padding: 18px; }
body.presentation .deployment-modes { gap: 16px; }
body.presentation .deployment-mode { padding: 18px 20px 22px; }
body.presentation .deployment-visual { height: 138px; margin: 14px 0 16px; }
body.presentation .deployment-mode h3 { margin-bottom: 7px; font-size: 22px; }
body.presentation .deployment-mode p { font-size: 14px; line-height: 1.42; }
body.presentation .deployment-pair article { padding: 28px; }
body.presentation .deployment-pair h3 { margin-top: 24px; }
body.presentation .product-shot img { max-height: 530px; }
body.presentation .product-shot figcaption { min-height: 40px; padding: 8px 13px; }
body.presentation .phone-frame img { height: min(56vh,540px); }
body.presentation .web-product-stage { gap: 40px; }
body.presentation .web-stage-copy h3 { font-size: clamp(24px, 2.5vw, 34px); }
body.presentation .web-stage-copy > p { font-size: 16px; }
body.presentation .web-product-shot img { max-height: 340px; }
body.presentation .admin-overview-stage .product-shot img { max-height: 340px; }
body.presentation .thanks h2 { font-size: clamp(66px, 9vw, 118px); }
body.presentation .site-nav,
body.presentation .mobile-nav,
body.presentation footer { display: none; }
body.presentation .presentation-controls {
  position: fixed;
  right: 24px;
  bottom: 20px;
  z-index: 90;
  display: grid;
  grid-template-columns: auto auto;
  gap: 8px;
  align-items: center;
  padding: 7px;
  color: var(--white);
  background: rgba(7, 23, 43, 0.9);
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: 999px;
  box-shadow: 0 14px 34px rgba(0,0,0,0.24);
  backdrop-filter: blur(16px);
}
body.presentation .presentation-controls button {
  padding: 9px 13px;
  color: var(--white);
  background: transparent;
  border: 0;
  border-radius: 999px;
  cursor: pointer;
}
body.presentation .presentation-controls button:hover { background: rgba(255,255,255,0.1); }
body.presentation .presentation-controls button:disabled { opacity: 0.35; cursor: default; }
.presentation-count { display: flex; gap: 4px; min-width: 54px; justify-content: center; font: 700 12px var(--mono); }

@keyframes page-enter {
  from { opacity: 0; transform: translateX(34px); }
  to { opacity: 1; transform: translateX(0); }
}
@keyframes page-enter-previous {
  from { opacity: 0; transform: translateX(-34px); }
  to { opacity: 1; transform: translateX(0); }
}

:focus-visible { outline: 3px solid #7da9ff; outline-offset: 3px; }

@media (max-width: 1000px) {
  .site-header { grid-template-columns: 1fr auto; }
  .site-nav { display: none; }
  .hero { grid-template-columns: 1fr; }
  .learner-overview-stage { grid-template-columns: 1fr; }
  body.presentation .learner-overview-stage { grid-template-columns: 1fr; gap: 28px; }
  .language-adaptation-map { grid-template-columns: 1fr; }
  .course-foundation, .language-output { grid-template-columns: 1fr; gap: 18px; }
  .language-engine { grid-template-columns: 1fr; width: 100%; min-height: 180px; border-radius: 90px; text-align: center; }
  .language-engine::before, .language-engine::after { left: 50%; width: 2px; height: 22px; transform: translateX(-50%); }
  .language-engine::before { top: -20px; }
  .language-engine::after { top: auto; right: auto; bottom: -20px; }
  .language-pills { justify-content: flex-start; }
  .web-product-stage { grid-template-columns: 1fr; }
  .course-creation-modes { grid-template-columns: 1fr; }
  .hero-stage { min-height: auto; }
  .platform-user-grid { grid-template-columns: 1fr 1fr; }
  .platform-school-value { grid-column: 1 / -1; }
  .platform-foundation-grid { grid-template-columns: 1fr 1fr; gap: 12px 0; }
  .platform-foundation-grid article:nth-child(3) { border-left: 0; }
  .learner-paths { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .management-flow, .closing-grid { grid-template-columns: 1fr 1fr; }
  .integration-map { grid-template-columns: 1fr; }
  .impact-metrics { grid-template-columns: 1fr; }
  .operations-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .access-grid { grid-template-columns: repeat(3, 1fr); }
  .ecosystem-map { grid-template-columns: 1fr; }
  .ecosystem-arrow { min-height: 70px; }
  .ecosystem-arrow::before, .ecosystem-arrow::after { left: 50%; width: 2px; height: 22px; transform: translateX(-50%); }
  .ecosystem-arrow::before { top: -20px; }
  .ecosystem-arrow::after { top: auto; right: auto; bottom: -20px; }
}

@media (min-width: 681px) and (max-width: 1000px) {
  body { padding-bottom: 74px; }
  .mobile-nav {
    position: fixed;
    right: auto;
    bottom: 12px;
    left: 50%;
    z-index: 60;
    display: grid;
    grid-template-columns: repeat(6, minmax(64px, 1fr));
    width: min(520px, calc(100% - 32px));
    padding: 7px;
    background: rgba(7, 23, 43, 0.96);
    border: 1px solid rgba(255,255,255,0.13);
    border-radius: 16px;
    box-shadow: 0 14px 38px rgba(7,23,43,0.3);
    backdrop-filter: blur(18px);
    transform: translateX(-50%);
  }
  .mobile-nav a {
    padding: 9px 5px;
    color: #aebed1;
    border-radius: 10px;
    text-align: center;
    text-decoration: none;
    font-size: 12px;
    font-weight: 700;
  }
  .mobile-nav a.is-active { color: var(--white); background: rgba(255,255,255,0.11); }
  body.presentation .mobile-nav { display: none; }
}

@media (max-width: 680px) {
  html { scroll-padding-top: 66px; }
  body { padding-bottom: calc(64px + env(safe-area-inset-bottom)); }
  .site-header {
    min-height: 60px;
    padding: 8px 16px;
    gap: 12px;
    background: rgba(7, 23, 43, 0.98);
  }
  .brand span:last-child { display: none; }
  .brand-mark { width: 34px; height: 34px; border-radius: 9px; }
  .mode-button {
    display: none;
  }

  .mobile-nav {
    position: fixed;
    inset: auto 10px calc(8px + env(safe-area-inset-bottom)) 10px;
    z-index: 60;
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    padding: 7px;
    background: rgba(7, 23, 43, 0.96);
    border: 1px solid rgba(255,255,255,0.13);
    border-radius: 16px;
    box-shadow: 0 14px 38px rgba(7,23,43,0.3);
    backdrop-filter: blur(18px);
  }
  .mobile-nav a {
    min-width: 0;
    padding: 9px 3px;
    color: #aebed1;
    border-radius: 10px;
    text-align: center;
    text-decoration: none;
    font-size: 10px;
    font-weight: 700;
  }
  .mobile-nav a.is-active { color: var(--white); background: rgba(255,255,255,0.11); }

  .story-section { padding: 66px 20px; }
  h1 { font-size: clamp(42px, 12.5vw, 54px); letter-spacing: -0.047em; }
  h2 { font-size: clamp(34px, 10vw, 44px); letter-spacing: -0.04em; }
  h3 { font-size: 24px; }
  .section-lead, .section-heading > p, .hero-lead { font-size: 17px; line-height: 1.62; }
  .section-heading { margin-bottom: 34px; }
  .hero { min-height: auto; gap: 54px; padding-top: 72px; padding-bottom: 72px; }
  .primary-action { width: 100%; padding: 14px 18px; text-align: center; }
  .status { padding: 7px 9px; font-size: 10px; }
  .hero-stage { border-radius: 18px; }
  .stage-tabs { gap: 2px; overflow-x: auto; padding: 9px; scrollbar-width: none; }
  .stage-tabs::-webkit-scrollbar { display: none; }
  .stage-tab { flex: 1 0 auto; padding: 10px 9px; font-size: 13px; }
  .stage-screen { min-height: 390px; gap: 24px; padding: 22px; }
  .stage-screen h2 { font-size: 32px; }
  .stage-placeholder { min-height: 180px; padding: 22px; }
  .platform-stack-layer, .platform-foundation-layer { padding: 18px; }
  .platform-stack-layer > header, .platform-foundation-layer > header { align-items: flex-start; flex-direction: column; gap: 7px; }
  .platform-user-grid { grid-template-columns: 1fr; gap: 18px; }
  .platform-school-value { grid-column: auto; }
  .platform-experience-grid { grid-template-columns: 1fr; }
  .platform-experience-bridge { min-height: 90px; }
  .platform-experience-bridge b { transform: rotate(90deg); }
  .platform-foundation-grid { grid-template-columns: 1fr 1fr; }
  .platform-foundation-grid article { padding: 11px 12px; }
  .course-source, .course-engine { width: 100%; }
  .course-fan-lines { display: none; }
  .learner-paths { grid-template-columns: 1fr; gap: 0; margin-top: 18px; }
  .learner-paths article { display: grid; grid-template-columns: auto 1fr; gap: 5px 14px; padding: 16px 0; background: transparent; border-top-width: 1px; }
  .learner-paths i { grid-row: 1 / span 2; padding-top: 4px; }
  .learner-paths strong { margin: 0; }
  .course-scale-note { align-items: center; flex-direction: column; }
  .management-flow, .closing-grid, .agent-sequence, .case-pair { grid-template-columns: 1fr; }
  .agenda-grid, .storyboard-three, .data-evidence, .question-flow, .deployment-pair, .deployment-modes { grid-template-columns: 1fr; }
  .dual-data-view { grid-template-columns: 1fr; }
  .dual-data-view > article { min-height: 0; padding: 24px; }
  .agenda-grid a { min-height: 0; padding: 24px 0; border-right: 0; }
  .cover-section h1 { font-size: clamp(52px, 15vw, 72px); }
  .listen-mode-gallery { grid-template-columns: 1fr; }
  .improvement-cycle { display: grid; height: auto; gap: 12px; }
  .cycle-ring, .cycle-arrow { display: none; }
  .cycle-center, .cycle-step { position: static; width: 100%; transform: none; }
  .cycle-center { order: -1; min-height: 140px; border-radius: 28px; }
  .cycle-step { min-height: 0; }
  .dashboard-metrics { grid-template-columns: 1fr; }
  .access-grid { grid-template-columns: 1fr 1fr; }
  .ecosystem-map { grid-template-columns: 1fr; }
  .deployment-mode { padding: 22px; }
  .deployment-visual { height: 160px; }
  .deployment-pair article { padding: 28px 24px; }
  .outcome-list li { grid-template-columns: 1fr; gap: 4px; }
  .media-sequence { gap: 16px; }
  .media-placeholder { border-radius: 14px; }
  .media-placeholder > div { min-height: 240px; padding: 22px; }
  .media-wide > div { min-height: 300px; }
  .agent-sequence { gap: 1px; border-radius: 14px; }
  .agent-sequence article { min-height: 0; padding: 24px; }
  .agent-sequence p { margin-top: 26px; font-size: 18px; }
  .management-flow { gap: 12px; }
  .management-flow article { padding: 24px; }
  .management-flow p { margin: 24px 0 0; }
  .admin-console { grid-template-columns: 1fr; }
  .admin-console aside { display: none; }
  .console-main { padding: 20px; }
  .console-topline { align-items: flex-start; flex-direction: column; gap: 6px; }
  .capability-row { grid-template-columns: 1fr auto; gap: 7px 12px; padding: 17px 0; }
  .capability-row b { grid-column: 1 / -1; grid-row: 2; font-size: 13px; }
  .capability-row i { grid-column: 2; grid-row: 1; }
  .system-stack { grid-template-columns: 1fr 1fr; }
  .system-stack span { min-height: 78px; padding: 13px; font-size: 13px; }
  .connection-core { min-height: 260px; padding: 24px; }
  .operations-stats { grid-template-columns: 1fr; }
  .operations-stats article { min-height: 180px; }
  .operations-stats strong { margin-top: 34px; }
  .case-pair { gap: 14px; }
  .case-pair article { padding: 28px 24px; }
  .case-pair h3 { margin-top: 22px; }
  .closing-grid { margin-top: 38px; }
  .closing-grid article { padding: 24px 0; border-bottom: 1px solid rgba(255,255,255,0.15); }
  .final-statement { flex-direction: column; }
  .product-shot { border-radius: 14px; }
  .product-shot figcaption { align-items: flex-start; flex-direction: column; }
  .web-product-stage { grid-template-columns: 1fr; }
  .course-creation-mobile { grid-template-columns: 1fr; }
  .course-creation-mobile .phone-frame img { height: 320px; }
  .course-creation-web .product-shot img { height: 240px; }
  footer { flex-direction: column; padding-bottom: 34px; }
  body.presentation .mobile-nav { display: none; }
  body.presentation main { height: calc(100dvh - 60px); }
  body.presentation .story-section {
    height: calc(100dvh - 60px);
    min-height: 0;
    padding: 24px 20px 76px;
    overflow-y: auto;
  }
  body.presentation .deployment-story,
  body.presentation .product-definition,
  body.presentation .course-scale-story,
  body.presentation .learner-overview,
  body.presentation .admin-story,
  body.presentation .two-panel,
  body.presentation .language-story,
  body.presentation .multilingual-story,
  body.presentation .ecosystem-story,
  body.presentation .teacher-create,
  body.presentation .data-story,
  body.presentation .improvement-story,
  body.presentation .impact-story,
  body.presentation .operations-story { align-content: start; }
  body.presentation .presentation-controls {
    right: 50%;
    bottom: calc(10px + env(safe-area-inset-bottom));
    transform: translateX(50%);
  }
}

@media (max-width: 430px) {
  .site-header { grid-template-columns: 1fr; }
  .brand span:last-child { display: inline; font-size: 14px; }
  .hero { padding-top: 62px; }
  .stage-tab { font-size: 12px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  body.presentation .story-section.is-presented { animation: none; }
}

@media print {
  .site-header, .stage-tabs { display: none !important; }
  .story-section { break-inside: avoid; min-height: auto; padding: 44px 34px; }
  .hero { color: var(--ink); background: var(--white); }
  .hero-lead, .hero .eyebrow { color: var(--muted); }
}