:root {
  --blue: #002fa7;
  --blue-deep: #001b69;
  --blue-soft: #eaf0ff;
  --yellow: #ffc62f;
  --ink: #121212;
  --muted: #656565;
  --line: #dedede;
  --paper: #ffffff;
  --max: 1160px;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC",
    "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--paper);
  font-synthesis: none;
  scroll-behavior: smooth;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

.topbar {
  position: sticky;
  z-index: 20;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 70px;
  padding: 10px max(24px, calc((100vw - var(--max)) / 2));
  border-bottom: 1px solid rgba(18, 18, 18, 0.1);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(20px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.brand img {
  width: 46px;
  height: 46px;
  border-radius: 11px;
}

.brand span {
  display: grid;
  line-height: 1.05;
}

.brand strong {
  font-size: 17px;
  letter-spacing: 0.02em;
}

.brand small {
  margin-top: 4px;
  color: var(--blue);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

nav {
  display: flex;
  gap: 28px;
  font-size: 14px;
  font-weight: 650;
}

nav a:hover,
nav a:focus-visible {
  color: var(--blue);
}

.hero {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  min-height: 700px;
  overflow: hidden;
  color: white;
  background: var(--blue);
}

.hero-copy,
.hero-art {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 90px max(40px, calc((100vw - var(--max)) / 2));
}

.hero-copy {
  padding-right: 50px;
}

.hero-art {
  position: relative;
  align-items: center;
  padding-left: 30px;
  background: var(--blue-deep);
}

.hero-art::before {
  position: absolute;
  width: 440px;
  height: 440px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 50%;
  content: "";
}

.icon-stage {
  position: relative;
  z-index: 1;
  width: min(360px, 72vw);
  filter: drop-shadow(0 34px 45px rgba(0, 0, 0, 0.32));
  transform: rotate(4deg);
}

.hero-art p {
  position: relative;
  z-index: 1;
  margin-top: 34px;
  font-size: 14px;
  font-weight: 650;
  letter-spacing: 0.1em;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--blue);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.hero .eyebrow,
.blue-section .eyebrow {
  color: var(--yellow);
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 720px;
  margin-bottom: 22px;
  font-size: clamp(52px, 6vw, 92px);
  font-weight: 820;
  letter-spacing: -0.06em;
  line-height: 1.02;
}

.lead {
  margin-bottom: 34px;
  color: rgba(255, 255, 255, 0.82);
  font-size: clamp(20px, 2vw, 28px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 20px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 999px;
  font-size: 14px;
  font-weight: 750;
}

.button.primary {
  border-color: var(--yellow);
  color: #171100;
  background: var(--yellow);
}

.button.secondary:hover,
.button.secondary:focus-visible {
  background: rgba(255, 255, 255, 0.12);
}

.facts {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin: 42px 0 0;
  padding: 0;
  color: rgba(255, 255, 255, 0.7);
  font-size: 12px;
  list-style: none;
}

.facts li::before {
  margin-right: 7px;
  color: var(--yellow);
  content: "●";
}

.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 110px 24px;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 48px;
}

.section-heading h2,
.privacy h2 {
  margin-bottom: 14px;
  font-size: clamp(36px, 4.4vw, 64px);
  font-weight: 790;
  letter-spacing: -0.045em;
  line-height: 1.08;
}

.section-heading > p:last-child {
  color: var(--muted);
  font-size: 18px;
}

.feature-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.contact-grid {
  grid-template-columns: repeat(3, 1fr);
}

.contact-grid a {
  color: var(--blue);
}

.contact-grid a:hover,
.contact-grid a:focus-visible {
  text-decoration: underline;
}

.feature-strip article {
  display: grid;
  gap: 10px;
  min-height: 150px;
  padding: 30px 24px;
  border-right: 1px solid var(--line);
}

.feature-strip article:last-child {
  border-right: 0;
}

.feature-strip strong {
  font-size: 22px;
}

.feature-strip span {
  color: var(--muted);
  font-size: 14px;
}

.blue-section {
  max-width: none;
  padding-right: max(24px, calc((100vw - var(--max)) / 2));
  padding-left: max(24px, calc((100vw - var(--max)) / 2));
  color: white;
  background: var(--blue);
}

.section-heading.light p:last-child {
  color: rgba(255, 255, 255, 0.72);
}

.download-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 22px;
  padding: 22px 24px;
  border: 1px solid rgba(255, 255, 255, 0.24);
  border-radius: 20px;
  background: rgba(0, 0, 0, 0.16);
}

.download-panel > div:first-child {
  display: grid;
  gap: 7px;
}

.download-panel strong {
  font-size: 18px;
}

.download-panel span {
  color: rgba(255, 255, 255, 0.72);
  font-size: 14px;
}

.download-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 14px;
}

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.2);
}

.steps article {
  min-height: 300px;
  padding: 34px;
  background: var(--blue);
}

.step-number {
  display: grid;
  width: 36px;
  height: 36px;
  margin-bottom: 42px;
  place-items: center;
  border-radius: 50%;
  color: #171100;
  background: var(--yellow);
  font-weight: 800;
}

.steps h3,
.trouble-section .faq-grid h3 {
  margin-bottom: 12px;
  font-size: 24px;
}

.steps p,
.trouble-section .faq-grid p {
  color: rgba(255, 255, 255, 0.74);
  font-size: 15px;
}

.install-note {
  margin-top: 22px;
  padding: 20px 24px;
  border-left: 4px solid var(--yellow);
  color: rgba(255, 255, 255, 0.82);
  background: rgba(0, 0, 0, 0.16);
}

.gesture-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 26px;
}

.gesture-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: white;
}

.gesture-card img {
  width: 100%;
  aspect-ratio: 1.35;
  border-bottom: 1px solid var(--line);
  background: white;
  object-fit: contain;
  object-position: center;
}

.gesture-copy {
  position: relative;
  padding: 28px 30px 30px;
}

.gesture-index {
  position: absolute;
  top: 30px;
  right: 30px;
  color: var(--blue);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
}

.gesture-copy h3 {
  margin-bottom: 10px;
  font-size: 25px;
}

.gesture-copy p {
  max-width: 90%;
  color: var(--muted);
  font-size: 15px;
}

.gesture-copy small {
  display: inline-block;
  padding: 5px 10px;
  border-radius: 999px;
  color: var(--blue);
  background: var(--blue-soft);
  font-size: 12px;
  font-weight: 700;
}

.gesture-rules {
  display: grid;
  grid-template-columns: 0.7fr 1.3fr;
  gap: 50px;
  margin-top: 26px;
  padding: 32px;
  border-radius: 18px;
  color: white;
  background: var(--ink);
}

.gesture-rules h3,
.gesture-rules p {
  margin: 0;
}

.gesture-rules p {
  color: rgba(255, 255, 255, 0.72);
}

.feedback-section {
  max-width: none;
  padding-right: max(24px, calc((100vw - var(--max)) / 2));
  padding-left: max(24px, calc((100vw - var(--max)) / 2));
  background: #f5f6f8;
}

.feedback-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.feedback-demo {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 12px;
  align-items: center;
  min-height: 70px;
  padding: 0 18px;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 20px;
  background: white;
  box-shadow: 0 18px 60px rgba(20, 20, 30, 0.12);
}

.live-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #28c65b;
  box-shadow: 0 0 0 5px rgba(40, 198, 91, 0.12);
}

.handle {
  color: #777;
  font-size: 22px;
}

.feedback-layout ul {
  display: grid;
  gap: 10px;
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
}

.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.trouble-section .faq-grid {
  gap: 1px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.2);
}

.trouble-section .faq-grid article {
  min-height: 220px;
  padding: 34px;
  color: white;
  background: var(--blue);
}

.privacy {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 80px;
  border-top: 1px solid var(--ink);
}

.privacy p {
  color: var(--muted);
}

code {
  padding: 2px 5px;
  border-radius: 5px;
  color: var(--blue);
  background: var(--blue-soft);
}

footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 32px max(24px, calc((100vw - var(--max)) / 2));
  color: rgba(255, 255, 255, 0.72);
  background: var(--blue-deep);
}

.footer-brand strong {
  color: white;
}

footer p {
  margin: 0;
  font-size: 13px;
}

@media (max-width: 860px) {
  nav {
    gap: 14px;
  }

  .hero {
    grid-template-columns: 1fr;
  }

  .hero-copy,
  .hero-art {
    padding: 70px 24px;
  }

  .hero-art {
    min-height: 520px;
  }

  .feature-strip,
  .steps,
  .gesture-grid,
  .faq-grid {
    grid-template-columns: 1fr 1fr;
  }

  .feature-strip article:nth-child(2) {
    border-right: 0;
  }

  .steps article {
    min-height: 260px;
  }

  .feedback-layout,
  .privacy {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .download-panel {
    align-items: flex-start;
    flex-direction: column;
  }

  .download-actions {
    justify-content: flex-start;
  }
}

@media (max-width: 600px) {
  .topbar nav {
    display: none;
  }

  h1 {
    font-size: 52px;
  }

  .section {
    padding-top: 80px;
    padding-bottom: 80px;
  }

  .feature-strip,
  .steps,
  .gesture-grid,
  .faq-grid,
  .gesture-rules {
    grid-template-columns: 1fr;
  }

  .feature-strip article {
    min-height: 110px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .feature-strip article:last-child {
    border-bottom: 0;
  }

  .gesture-copy p {
    max-width: none;
  }

  footer {
    align-items: flex-start;
    flex-direction: column;
    gap: 22px;
  }
}

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

@media print {
  .topbar,
  .hero-actions {
    display: none;
  }

  .hero {
    min-height: auto;
    color: black;
    background: white;
  }

  .hero-copy {
    padding: 40px 24px;
  }

  .hero-art {
    display: none;
  }

  .hero .eyebrow,
  .lead {
    color: black;
  }

  .section {
    padding-top: 40px;
    padding-bottom: 40px;
  }
}