:root {
  --navy: #111827;
  --ink: #1f2937;
  --muted: #64748b;
  --blue: #156082;
  --red: #e82127;
  --green: #218b64;
  --orange: #e97132;
  --paper: #f7f8fa;
  --line: #dde5ef;
  --white: #fff;
}

* { box-sizing: border-box; }
html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  font-family: "Aptos", "Microsoft YaHei", Arial, sans-serif;
  color: var(--ink);
  background: #0b111b;
}

button { font: inherit; }

.deck {
  position: fixed;
  inset: 0;
  background: #0b111b;
}

.slide {
  position: absolute;
  inset: 0;
  display: none;
  width: 100vw;
  height: 100vh;
  padding: clamp(34px, 5.4vw, 82px);
  background: var(--paper);
  overflow: hidden;
}

.slide.active {
  display: block;
  animation: enter .24s ease-out;
}

@keyframes enter {
  from { opacity: .4; transform: translateX(18px); }
  to { opacity: 1; transform: translateX(0); }
}

.slide-head {
  max-width: min(1180px, 84vw);
  margin-bottom: clamp(20px, 3vw, 42px);
}

.slide-head p {
  margin: 0 0 9px;
  color: var(--blue);
  font-size: clamp(12px, 1vw, 16px);
  font-weight: 900;
  text-transform: uppercase;
}

h1,
h2,
h3,
p { letter-spacing: 0; }

h2 {
  margin: 0;
  color: var(--navy);
  font-size: clamp(36px, 5.6vw, 76px);
  line-height: 1.02;
  max-width: 1220px;
}

h3 {
  margin: 0;
  color: var(--navy);
  font-size: clamp(22px, 2.4vw, 34px);
  line-height: 1.12;
}

p {
  margin: 0;
  color: var(--muted);
  font-size: clamp(16px, 1.55vw, 24px);
  line-height: 1.42;
}

.cover {
  padding: 0;
  background: var(--navy);
}

.cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.shade {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(17,24,39,.88) 0%, rgba(17,24,39,.68) 42%, rgba(17,24,39,.08) 78%);
}

.cover-copy {
  position: absolute;
  left: clamp(38px, 8vw, 132px);
  bottom: clamp(48px, 13vh, 136px);
  max-width: 760px;
  color: var(--white);
}

.cover-copy p {
  margin-bottom: 18px;
  color: #d8e2ef;
  font-weight: 800;
}

.cover-copy h1 {
  margin: 0 0 22px;
  color: var(--white);
  font-size: clamp(58px, 9vw, 128px);
  line-height: .92;
}

.cover-copy span {
  color: #d8e2ef;
  font-size: clamp(16px, 1.7vw, 24px);
  font-weight: 800;
}

.agenda,
.three-col,
.metrics,
.two-col,
.feature-wall,
.value-grid,
.service-grid {
  display: grid;
  gap: clamp(16px, 1.5vw, 24px);
}

.agenda { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.three-col,
.value-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.metrics { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.two-col,
.service-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.feature-wall { grid-template-columns: repeat(5, minmax(0, 1fr)); }

.agenda article,
.three-col article,
.metrics article,
.two-col article,
.feature-wall article,
.value-grid article,
.service-grid article,
.proof article,
.headline-strip,
.specs article,
.process article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  box-shadow: 0 18px 40px rgba(15, 23, 42, .08);
}

.agenda article,
.three-col article,
.feature-wall article,
.value-grid article,
.service-grid article,
.two-col article {
  min-height: clamp(148px, 18vh, 240px);
  padding: clamp(18px, 2vw, 30px);
}

.agenda strong,
.metrics strong {
  display: block;
  margin-bottom: 18px;
  color: var(--red);
  font-size: clamp(34px, 4vw, 60px);
  line-height: 1;
}

.agenda p,
.three-col p,
.feature-wall p,
.value-grid p,
.service-grid p,
.two-col p {
  margin-top: 14px;
}

.metrics article {
  min-height: clamp(128px, 16vh, 190px);
  padding: clamp(18px, 2vw, 28px);
}

.metrics article:nth-child(2) strong { color: #1c4e88; }
.metrics article:nth-child(3) strong { color: var(--green); }
.metrics article:nth-child(4) strong { color: var(--orange); }

.metrics span {
  color: var(--navy);
  font-size: clamp(16px, 1.4vw, 23px);
  font-weight: 900;
}

.two-col { margin-top: clamp(16px, 2.4vw, 32px); }

.three-col article span,
.feature-wall article span {
  display: inline-grid;
  width: 42px;
  height: 42px;
  margin-bottom: 22px;
  place-items: center;
  border-radius: 50%;
  background: var(--blue);
  color: var(--white);
  font-weight: 900;
}

.headline-strip {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-top: clamp(20px, 2.5vw, 34px);
  padding: clamp(18px, 2.2vw, 28px);
}

.headline-strip strong {
  color: var(--red);
  font-size: clamp(48px, 6vw, 90px);
  line-height: .9;
}

.product-stage,
.media-layout,
.vertical-media-layout,
.control-stage {
  display: grid;
  gap: clamp(18px, 2vw, 28px);
}

.product-stage {
  grid-template-columns: minmax(420px, .95fr) minmax(430px, 1.05fr);
  align-items: start;
}

.statement {
  color: var(--ink);
  font-size: clamp(20px, 1.95vw, 30px);
  font-weight: 800;
}

.process {
  display: grid;
  gap: 12px;
  margin: clamp(18px, 2vw, 28px) 0;
}

.process article {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 3px 14px;
  padding: 16px;
}

.process span {
  grid-row: span 2;
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border-radius: 50%;
  background: var(--blue);
  color: var(--white);
  font-weight: 900;
}

.process strong {
  color: var(--navy);
  font-size: clamp(18px, 1.5vw, 24px);
}

.process p {
  font-size: clamp(14px, 1.15vw, 18px);
}

.specs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.specs article {
  padding: 16px;
}

.specs span {
  display: block;
  color: var(--muted);
  font-size: clamp(12px, 1vw, 16px);
  font-weight: 900;
  text-transform: uppercase;
}

.specs strong {
  display: block;
  margin-top: 8px;
  color: var(--blue);
  font-size: clamp(24px, 2.2vw, 36px);
}

video {
  width: 100%;
  background: #0f172a;
  border-radius: 8px;
  box-shadow: 0 22px 52px rgba(15, 23, 42, .18);
}

.product-stage video {
  aspect-ratio: 480 / 408;
  object-fit: contain;
}

.media-layout {
  grid-template-columns: minmax(560px, 1.25fr) minmax(310px, .75fr);
  align-items: center;
}

.media-layout video {
  aspect-ratio: 16 / 9;
  object-fit: contain;
}

.vertical-media-layout {
  grid-template-columns: minmax(320px, .7fr) minmax(420px, 1fr);
  align-items: center;
}

.vertical-media-layout video {
  max-height: 62vh;
  object-fit: contain;
}

.proof {
  display: grid;
  gap: 14px;
}

.proof article {
  padding: clamp(16px, 1.7vw, 24px);
}

.proof span {
  display: block;
  margin-bottom: 10px;
  color: var(--red);
  font-size: clamp(12px, 1vw, 15px);
  font-weight: 900;
  text-transform: uppercase;
}

.control-stage {
  grid-template-columns: .8fr 1.35fr .85fr;
  align-items: stretch;
}

.control-stage figure {
  display: grid;
  min-height: 38vh;
  margin: 0;
  padding: clamp(16px, 1.8vw, 26px);
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  box-shadow: 0 18px 40px rgba(15, 23, 42, .08);
}

.control-stage img {
  max-width: 100%;
  max-height: 44vh;
  object-fit: contain;
}

.control-stage .phone img { max-height: 50vh; }

.control-stage figcaption {
  margin-top: 12px;
  color: var(--navy);
  font-size: clamp(18px, 1.5vw, 24px);
  font-weight: 900;
}

.method-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: clamp(20px, 2.4vw, 34px);
}

.method-row span {
  border-radius: 999px;
  background: #edf4f8;
  color: var(--blue);
  padding: 12px 18px;
  font-size: clamp(15px, 1.2vw, 20px);
  font-weight: 900;
}

.feature-wall article {
  min-height: clamp(210px, 31vh, 350px);
}

.value-grid article strong {
  display: block;
  margin-top: clamp(26px, 4vw, 56px);
  color: var(--blue);
  font-size: clamp(18px, 1.6vw, 26px);
}

.closing-line {
  margin-top: clamp(22px, 3vw, 46px);
  color: var(--red);
  font-size: clamp(28px, 4vw, 58px);
  font-weight: 900;
}

.closing {
  background: var(--navy);
}

.closing .slide-head p,
.closing h2,
.closing h3,
.closing footer {
  color: var(--white);
}

.closing .slide-head p { color: #93c5fd; }

.closing h3 {
  max-width: 1020px;
  margin: clamp(16px, 2vw, 28px) 0 clamp(22px, 3vw, 42px);
  font-size: clamp(30px, 4vw, 58px);
}

.closing .service-grid article {
  background: #1b2636;
  border-color: #3d4c60;
  box-shadow: none;
}

.service-grid strong {
  color: var(--white);
  font-size: clamp(18px, 1.6vw, 26px);
}

.service-grid p {
  color: #d8e2ef;
}

.closing footer {
  position: absolute;
  left: clamp(34px, 5.4vw, 82px);
  bottom: clamp(28px, 4vw, 58px);
  font-size: clamp(16px, 1.5vw, 24px);
  font-weight: 900;
}

.progress {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 40;
  height: 5px;
  background: rgba(255, 255, 255, .16);
}

.progress span {
  display: block;
  width: 0;
  height: 100%;
  background: var(--red);
  transition: width .2s ease;
}

.counter {
  position: fixed;
  right: 24px;
  top: 22px;
  z-index: 42;
  min-width: 72px;
  padding: 8px 12px;
  border: 1px solid rgba(255, 255, 255, .18);
  border-radius: 999px;
  background: rgba(17, 24, 39, .6);
  color: var(--white);
  font-size: 14px;
  font-weight: 900;
  text-align: center;
  backdrop-filter: blur(12px);
}

.slide-nav {
  position: fixed;
  left: 50%;
  bottom: 20px;
  z-index: 42;
  display: flex;
  gap: 8px;
  transform: translateX(-50%);
}

.slide-nav button {
  width: 9px;
  height: 9px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: rgba(100, 116, 139, .45);
  cursor: pointer;
}

.slide-nav button.active {
  width: 28px;
  border-radius: 999px;
  background: var(--red);
}

.nav-button,
.fullscreen {
  position: fixed;
  z-index: 42;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, .18);
  border-radius: 50%;
  background: rgba(17, 24, 39, .55);
  color: var(--white);
  font-weight: 900;
  cursor: pointer;
  backdrop-filter: blur(12px);
}

.nav-button {
  top: 50%;
  width: 46px;
  height: 46px;
  font-size: 26px;
  transform: translateY(-50%);
}

.prev { left: 18px; }
.next { right: 18px; }

.fullscreen {
  right: 24px;
  bottom: 24px;
  width: 46px;
  height: 46px;
  font-size: 15px;
}

@media (max-width: 1100px) {
  .slide {
    position: relative;
    display: block;
    min-height: 100vh;
    height: auto;
    overflow: visible;
  }
  body { overflow: auto; }
  .slide:not(.active) { display: none; }
  .agenda,
  .three-col,
  .metrics,
  .two-col,
  .feature-wall,
  .value-grid,
  .service-grid,
  .product-stage,
  .media-layout,
  .vertical-media-layout,
  .control-stage {
    grid-template-columns: 1fr;
  }
  .feature-wall { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .control-stage figure { min-height: auto; }
  .nav-button { display: none; }
}

@media (max-width: 640px) {
  .slide { padding: 28px 18px 68px; }
  .cover-copy { left: 24px; right: 24px; bottom: 70px; }
  .feature-wall { grid-template-columns: 1fr; }
  .headline-strip { align-items: flex-start; flex-direction: column; }
  .specs { grid-template-columns: 1fr; }
  .slide-nav { max-width: 82vw; overflow-x: auto; }
}