:root {
  --ink: #111827;
  --ink-2: #182233;
  --paper: #ffffff;
  --cream: #f7f5ef;
  --soft: #eef1f5;
  --line: #d9dee7;
  --muted: #667184;
  --yellow: #f4b728;
  --blue: #4f6dba;
  --green: #45b36b;
  --orange: #f06828;
  --pale-blue: #e9eef9;
  --pale-green: #e7f6eb;
  --pale-orange: #fff0e8;
  --pale-yellow: #fff4cf;
  color-scheme: light;
  font-family: Arial, Helvetica, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-snap-type: y mandatory; }
body { margin: 0; color: var(--ink); background: var(--cream); }
button, a { font: inherit; }
a { color: inherit; }

.presentation-nav {
  position: fixed;
  z-index: 50;
  top: 16px;
  left: 50%;
  width: min(calc(100% - 32px), 1320px);
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 10px 12px 10px 18px;
  border: 1px solid rgb(217 222 231 / 72%);
  border-radius: 16px;
  background: rgb(255 255 255 / 88%);
  box-shadow: 0 12px 36px rgb(17 24 39 / 10%);
  backdrop-filter: blur(14px);
}

.brand { text-decoration: none; font-weight: 800; font-size: 18px; line-height: 1; }
.brand-accent, .brand-inline > span { color: var(--yellow); }
.brand small, .brand-inline small { display: block; margin-top: 5px; font-size: 10px; font-weight: 400; color: var(--muted); }
.nav-actions { display: flex; align-items: center; gap: 8px; }
.nav-actions button {
  width: 38px;
  height: 38px;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: var(--paper);
  color: var(--ink);
  cursor: pointer;
}
.nav-actions button:hover, .nav-actions button:focus-visible { border-color: var(--blue); outline: none; }
.slide-counter { margin-right: 5px; color: var(--muted); font-size: 13px; }
.slide-counter strong { color: var(--ink); }

.slide {
  min-height: 100svh;
  scroll-snap-align: start;
  scroll-snap-stop: always;
  position: relative;
  overflow: hidden;
}
.slide-dark { background: var(--ink); color: var(--paper); }
.slide-light { background: var(--cream); }
.slide-white { background: var(--paper); }
.slide-shell {
  width: min(100%, 1440px);
  min-height: 100svh;
  margin: 0 auto;
  padding: clamp(94px, 9vh, 124px) clamp(24px, 6vw, 92px) 64px;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

h1, h2, h3, h4, p { margin-top: 0; }
h1 { margin-bottom: 70px; font-size: clamp(48px, 6vw, 92px); line-height: .98; letter-spacing: -.045em; }
h2 { max-width: 1180px; margin-bottom: 24px; font-size: clamp(38px, 4.5vw, 68px); line-height: 1.02; letter-spacing: -.035em; }
.intro { max-width: 920px; margin-bottom: 52px; color: var(--muted); font-size: clamp(19px, 2vw, 28px); line-height: 1.35; }
.slide-dark .intro { color: #b7c1cf; }
.lead { max-width: 740px; color: #c6ceda; font-size: clamp(20px, 2.1vw, 30px); line-height: 1.4; }
.eyebrow {
  margin-bottom: 38px;
  color: var(--muted);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: .02em;
  text-transform: uppercase;
}
.eyebrow::before { content: ""; display: inline-block; width: 28px; height: 5px; margin-right: 14px; border-radius: 5px; vertical-align: middle; background: currentColor; }
.eyebrow.yellow::before { background: var(--yellow); }
.eyebrow.blue::before { background: var(--blue); }
.eyebrow.green::before { background: var(--green); }
.eyebrow.orange::before { background: var(--orange); }
.footer { position: absolute; right: clamp(24px, 6vw, 92px); bottom: 24px; left: clamp(24px, 6vw, 92px); display: flex; justify-content: space-between; margin: 0; color: var(--muted); font-size: 13px; }
.slide-dark .footer { color: #aeb8c8; }
.note { color: #8f9cae; font-size: 14px; font-style: italic; }

.cover-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(280px, 390px); align-items: center; gap: clamp(48px, 8vw, 130px); }
.brand-inline { margin-bottom: 88px; font-size: clamp(25px, 2.4vw, 34px); font-weight: 800; }
.brand-inline small { color: #aeb8c8; }
.brand-dark small { color: var(--muted); }
.responsible { margin-top: 90px; color: #8f9cae; font-size: 14px; }
.cover-sequence { position: relative; margin: 0; padding: 0 0 0 48px; list-style: none; }
.cover-sequence::before { content: ""; position: absolute; top: 22px; bottom: 22px; left: 18px; width: 2px; background: #364155; }
.cover-sequence li { position: relative; margin: 0 0 56px; color: var(--paper); font-size: 17px; font-weight: 800; text-transform: uppercase; }
.cover-sequence li:last-child { margin-bottom: 0; }
.cover-sequence li::before { content: ""; position: absolute; left: -48px; top: -8px; width: 36px; height: 36px; border-radius: 50%; background: var(--accent); }

.fragment-cloud { display: grid; grid-template-columns: repeat(6, minmax(120px, 1fr)); align-items: center; gap: 18px; margin: 16px 0 56px; }
.chip { min-height: 76px; display: flex; align-items: center; padding: 18px 18px 18px 24px; border-left: 8px solid currentColor; border-radius: 15px; color: var(--ink); font-size: clamp(17px, 1.7vw, 24px); font-weight: 800; }
.chip.blue { background: var(--pale-blue); border-color: var(--blue); }
.chip.green { background: var(--pale-green); border-color: var(--green); }
.chip.orange { background: var(--pale-orange); border-color: var(--orange); }
.chip.yellow { background: var(--pale-yellow); border-color: var(--yellow); }
.chip.neutral { background: var(--soft); border-color: var(--muted); }
.chip.ink { background: var(--paper); border-color: var(--ink); }
.statement { border-top: 1px solid var(--line); padding-top: 34px; }
.statement strong, .statement b { display: block; }
.statement strong { margin-bottom: 18px; font-size: clamp(20px, 2vw, 28px); }
.statement b { max-width: 900px; color: var(--blue); font-size: clamp(27px, 3vw, 42px); line-height: 1.12; }

.vision-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 70px; align-items: center; }
.vision-callout { max-width: 640px; margin-top: 90px; padding: 28px 34px; border-radius: 16px; background: var(--yellow); color: var(--ink); font-size: clamp(23px, 2.4vw, 34px); font-weight: 800; }
.number-list { margin: 0; padding: 0; list-style: none; }
.number-list li { display: grid; grid-template-columns: 60px 1fr; gap: 18px; padding: 18px 0; border-bottom: 1px solid #354155; font-size: clamp(22px, 2.3vw, 34px); font-weight: 800; }
.number-list span { color: var(--yellow); font-size: 14px; }

.method-flow { position: relative; display: grid; grid-template-columns: repeat(6, 1fr); gap: 18px; margin: 58px 0 58px; padding: 0; list-style: none; }
.method-flow::before { content: ""; position: absolute; z-index: 0; top: 30px; right: 7%; left: 7%; height: 3px; background: var(--line); }
.method-flow li { position: relative; z-index: 1; display: grid; justify-items: center; text-align: center; }
.method-flow span { width: 62px; height: 62px; display: grid; place-items: center; margin-bottom: 30px; border-radius: 50%; background: var(--accent); color: var(--paper); font-weight: 800; }
.method-flow li.yellow span { color: var(--ink); }
.method-flow strong { color: var(--ink); font-size: clamp(17px, 1.6vw, 22px); }
.method-flow small { margin-top: 18px; color: var(--muted); font-size: 16px; line-height: 1.3; }
.method-result { margin: 0; padding: 22px; border-radius: 12px; background: var(--cream); text-align: center; font-size: clamp(19px, 2vw, 27px); font-weight: 800; }

.pattern-groups { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.pattern-card { min-height: 330px; padding: 34px 38px; border-left: 12px solid currentColor; border-radius: 20px; }
.pattern-card.blue { background: var(--pale-blue); color: var(--blue); }
.pattern-card.orange { background: var(--pale-orange); color: var(--orange); }
.pattern-card.green { background: var(--pale-green); color: var(--green); }
.pattern-card h3 { font-size: 16px; text-transform: uppercase; }
.pattern-card ul { margin: 34px 0 0; padding: 0; list-style: none; color: var(--ink); }
.pattern-card li { padding: 11px 0; border-bottom: 1px solid rgb(255 255 255 / 86%); font-size: clamp(20px, 2vw, 28px); font-weight: 800; }
.pattern-card li:last-child { border-bottom: 0; }

.applications-grid { display: grid; grid-template-columns: .9fr 1.1fr; gap: 70px; align-items: center; }
.sector-map { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; align-items: stretch; }
.sector-center { grid-column: 1 / -1; justify-self: center; width: min(300px, 80%); display: grid; place-items: center; padding: 28px; border-radius: 22px; background: var(--paper); color: var(--ink); text-align: center; font-size: 24px; text-transform: uppercase; }
.sector { display: grid; place-items: center; min-height: 72px; padding: 18px; border: 1px solid #344156; border-left: 8px solid var(--accent); border-radius: 16px; background: var(--ink-2); color: var(--paper); text-align: center; font-size: 18px; font-weight: 800; }

.operation-flow { display: grid; grid-template-columns: repeat(9, minmax(112px, 1fr)); gap: 12px; margin: 10px 0 62px; padding: 0; overflow-x: auto; list-style: none; scrollbar-width: thin; }
.operation-flow li { min-height: 82px; display: grid; place-items: center; padding: 17px 10px; border-top: 8px solid currentColor; border-radius: 15px; color: var(--ink); text-align: center; font-weight: 800; }
.operation-flow li.blue { background: var(--pale-blue); border-color: var(--blue); }
.operation-flow li.yellow { background: var(--pale-yellow); border-color: var(--yellow); }
.operation-flow li.orange { background: var(--pale-orange); border-color: var(--orange); }
.operation-flow li.green { background: var(--pale-green); border-color: var(--green); }
.operation-flow li.ink { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.possibilities-title { margin-bottom: 30px; font-size: 24px; }
.possibilities { display: grid; grid-template-columns: repeat(4, 1fr); gap: 34px; }
.possibilities article { padding-top: 20px; border-top: 5px solid var(--accent); }
.possibilities h4 { margin-bottom: 16px; color: var(--ink); font-size: 20px; }
.possibilities p { color: var(--muted); font-size: 16px; line-height: 1.4; }

.case-grid { display: grid; grid-template-columns: 330px 1fr; gap: 42px; align-items: start; }
.tswitch-logo { width: min(100%, 300px); max-height: 90px; object-fit: contain; object-position: left center; margin-bottom: 30px; }
.case-copy .intro { margin-bottom: 24px; font-size: 20px; }
.modules { font-size: 18px; font-weight: 800; }
.verified-list { margin: 38px 0 0; padding: 0; list-style: none; }
.verified-list li { position: relative; margin-bottom: 23px; padding-left: 24px; color: var(--ink); font-weight: 800; line-height: 1.35; }
.verified-list li::before { content: ""; position: absolute; top: 0; bottom: 0; left: 0; width: 8px; border-radius: 5px; background: var(--accent); }
.screenshots { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.shot { position: relative; min-height: 148px; margin: 0; overflow: hidden; border: 1px solid #aab4c4; border-radius: 18px; background: var(--paper); }
.shot-main { grid-column: 1 / -1; min-height: 280px; }
.shot::before { content: ""; position: absolute; z-index: 1; top: 18px; left: 18px; width: 48px; height: 7px; border-radius: 4px; background: var(--accent); }
.shot-main::before { width: 72px; }
.shot img { position: absolute; z-index: 3; inset: 0; width: 100%; height: 100%; object-fit: cover; background: var(--paper); }
.shot figcaption { position: absolute; inset: 0; display: grid; place-content: center; gap: 22px; padding: 34px 18px 18px; text-align: center; }
.shot figcaption small { color: var(--muted); font-size: 12px; font-weight: 800; text-transform: uppercase; }
.shot figcaption strong { color: var(--ink); font-size: 17px; }
.shot-main figcaption strong { font-size: 24px; }

.responsibility-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 24px; margin: 42px 0 48px; }
.responsibility-grid article { min-height: 175px; padding: 40px 20px 24px; border: 1px solid #344156; border-top: 8px solid var(--accent); border-radius: 16px; background: var(--ink-2); color: var(--paper); text-align: center; }
.responsibility-grid h3 { font-size: 20px; }
.responsibility-grid p { margin: 0; color: #b7c1cf; font-size: 15px; line-height: 1.35; }

.cta-grid { display: grid; grid-template-columns: 1.25fr .75fr; gap: 72px; align-items: center; }
.cta-grid h2 { font-size: clamp(54px, 6vw, 88px); }
.primary-cta { display: inline-flex; align-items: center; justify-content: center; margin-top: 30px; padding: 22px 34px; border-radius: 16px; background: var(--yellow); text-decoration: none; text-transform: uppercase; font-weight: 800; }
.primary-cta:hover, .primary-cta:focus-visible { box-shadow: 0 12px 28px rgb(244 183 40 / 34%); outline: 3px solid rgb(79 109 186 / 35%); }
.contact-card { padding-left: clamp(32px, 5vw, 72px); border-left: 1px solid var(--line); font-style: normal; }
.contact-card h3 { margin-bottom: 8px; font-size: clamp(30px, 3vw, 42px); }
.contact-card > p { color: var(--muted); font-size: 18px; }
.contact-card dl { margin: 70px 0; }
.contact-card dl div { margin-bottom: 42px; }
.contact-card dt { margin-bottom: 13px; font-size: 13px; font-weight: 800; text-transform: uppercase; }
.contact-card dd { margin: 0; font-size: clamp(20px, 2vw, 28px); font-weight: 800; }
.contact-card dd a { text-decoration: none; }
.contact-card dd a:hover, .contact-card dd a:focus-visible { text-decoration: underline; outline: none; }
.contact-card small { color: var(--muted); font-size: 14px; }

.yellow { --accent: var(--yellow); }
.blue { --accent: var(--blue); }
.green { --accent: var(--green); }
.orange { --accent: var(--orange); }
.green-text { color: var(--green); }
.blue-text { color: var(--blue); }

.slide-dots { position: fixed; z-index: 45; top: 50%; right: 16px; display: grid; gap: 8px; transform: translateY(-50%); }
.slide-dots button { width: 9px; height: 9px; padding: 0; border: 0; border-radius: 50%; background: #9aa4b5; opacity: .42; cursor: pointer; }
.slide-dots button.is-active { transform: scale(1.45); background: var(--yellow); opacity: 1; }

@media (max-width: 1050px) {
  html { scroll-snap-type: none; }
  .slide { min-height: auto; overflow: visible; }
  .slide-shell { min-height: auto; padding-top: 112px; padding-bottom: 88px; }
  .cover-grid, .vision-grid, .applications-grid, .cta-grid { grid-template-columns: 1fr; }
  .cover-sequence { max-width: 420px; }
  .fragment-cloud { grid-template-columns: repeat(3, 1fr); }
  .method-flow { grid-template-columns: repeat(3, 1fr); }
  .method-flow::before { display: none; }
  .pattern-groups { grid-template-columns: 1fr; }
  .pattern-card { min-height: 0; }
  .case-grid { grid-template-columns: 1fr; }
  .responsibility-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-card { padding: 42px 0 0; border-top: 1px solid var(--line); border-left: 0; }
  .contact-card dl { margin: 48px 0; }
}

@media (max-width: 680px) {
  .presentation-nav { top: auto; bottom: 12px; }
  .brand small { display: none; }
  .slide-shell { padding: 76px 20px 104px; }
  h1 { margin-bottom: 44px; }
  .brand-inline { margin-bottom: 56px; }
  .responsible { margin-top: 54px; }
  .fragment-cloud { grid-template-columns: repeat(2, 1fr); }
  .chip { min-height: 64px; padding: 14px 12px 14px 16px; border-left-width: 6px; }
  .method-flow { grid-template-columns: repeat(2, 1fr); }
  .method-flow li { min-height: 170px; }
  .sector-map, .possibilities, .responsibility-grid { grid-template-columns: 1fr; }
  .screenshots { grid-template-columns: 1fr; }
  .shot-main { grid-column: auto; min-height: 220px; }
  .shot { min-height: 180px; }
  .footer { right: 20px; bottom: 76px; left: 20px; }
  .slide-dots { display: none; }
  .contact-card dd { overflow-wrap: anywhere; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

@media print {
  .presentation-nav, .slide-dots { display: none; }
  .slide, .slide-shell { min-height: 100vh; break-after: page; }
}