:root {
  --bg: #f5f5f7;
  --surface: #ffffff;
  --surface-soft: #fbfbfd;
  --ink: #1d1d1f;
  --muted: #6e6e73;
  --line: #d2d2d7;
  --accent: #0071e3;
  --shadow-lg: 0 30px 80px rgba(15, 23, 42, 0.12);
  --shadow-md: 0 18px 42px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(210, 225, 255, 0.55), transparent 30%),
    radial-gradient(circle at top right, rgba(223, 236, 255, 0.55), transparent 26%),
    var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.6;
}

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

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

.site-header,
.hero,
.asset-ribbon,
.split-section,
.overview-band,
.product-story,
.card-stage,
.support-section,
.site-footer {
  width: min(1200px, calc(100% - 48px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  padding: 0 4px;
  background: rgba(245, 245, 247, 0.78);
  backdrop-filter: blur(18px);
}

.brand,
.nav,
.hero-actions {
  display: flex;
  align-items: center;
}

.brand {
  gap: 12px;
}

.brand-mark {
  width: 36px;
  height: 36px;
  flex: 0 0 auto;
  border-radius: 8px;
}

.brand-name {
  font-size: 18px;
  font-weight: 700;
}

.nav {
  gap: 26px;
  color: var(--muted);
  font-size: 14px;
}

.nav a:hover {
  color: var(--ink);
}

.hero {
  padding: 72px 0 44px;
  text-align: center;
}

.eyebrow {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 14px;
  font-weight: 700;
}

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

h1 {
  max-width: 980px;
  margin-right: auto;
  margin-left: auto;
  margin-bottom: 20px;
  font-size: clamp(42px, 6vw, 82px);
  line-height: 1.02;
  letter-spacing: -0.02em;
}

h2 {
  margin-bottom: 16px;
  font-size: clamp(30px, 3.8vw, 54px);
  line-height: 1.08;
  letter-spacing: -0.02em;
}

h3 {
  margin-bottom: 10px;
  font-size: 24px;
  line-height: 1.18;
}

.hero-lead,
.copy-block p,
.section-heading p,
.metric-grid p,
.product-card p,
.support-contact p,
.qr-card p {
  color: var(--muted);
}

.hero-lead {
  max-width: 760px;
  margin-right: auto;
  margin-left: auto;
  font-size: 21px;
}

.hero-actions {
  justify-content: center;
  gap: 12px;
  margin: 34px 0 48px;
}

.primary-action,
.secondary-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 20px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
}

.primary-action {
  color: #fff;
  background: #1d1d1f;
}

.secondary-action {
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(210, 210, 215, 0.95);
}

.hero-visual,
.showcase-visual,
.device-shot,
.settings-shot {
  overflow: hidden;
  margin-bottom: 0;
}

.hero-visual img,
.showcase-visual img,
.device-shot img,
.settings-shot img {
  width: 100%;
  height: auto;
}

.hero-visual {
  border-radius: 34px;
  box-shadow: var(--shadow-lg);
}

.asset-ribbon {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  padding: 14px 0 92px;
}

.asset-ribbon span {
  padding: 10px 18px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(210, 210, 215, 0.88);
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
}

.split-section,
.product-story {
  display: grid;
  grid-template-columns: minmax(340px, 0.78fr) minmax(0, 1fr);
  gap: 72px;
  align-items: center;
  padding: 98px 0;
}

.split-section.reverse {
  grid-template-columns: minmax(0, 1fr) minmax(340px, 0.78fr);
}

.copy-block {
  max-width: 490px;
}

.copy-block p {
  font-size: 18px;
}

.overview-band {
  padding: 112px 0;
  border-radius: 42px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.82), rgba(248, 248, 250, 0.98));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.65);
}

.section-heading {
  max-width: 760px;
  margin: 0 auto 42px;
  text-align: center;
}

.section-heading.narrow {
  max-width: 720px;
}

.metric-grid,
.card-grid {
  display: grid;
  gap: 18px;
}

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

.metric-grid article,
.product-card {
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid rgba(210, 210, 215, 0.8);
  box-shadow: var(--shadow-md);
}

.metric-grid article {
  min-height: 230px;
  padding: 28px;
}

.metric-grid span {
  color: var(--accent);
  font-size: 14px;
  font-weight: 700;
}

.metric-grid strong {
  display: block;
  margin: 26px 0 14px;
  font-size: 30px;
  line-height: 1.08;
}

.product-story {
  grid-template-columns: minmax(0, 0.95fr) minmax(320px, 0.7fr);
}

.device-shot,
.settings-shot {
  padding: 36px;
  border-radius: 32px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.95), rgba(240, 244, 248, 0.88));
  box-shadow: var(--shadow-lg);
}

.card-stage {
  padding: 108px 0;
}

.card-grid {
  grid-template-columns: repeat(2, 1fr);
}

.product-card {
  overflow: hidden;
}

.product-card img {
  width: 100%;
  background: #eef3f7;
}

.product-card div {
  padding: 28px;
}

.support-section {
  padding: 108px 0 84px;
}

.support-layout {
  display: grid;
  grid-template-columns: minmax(320px, 0.9fr) repeat(2, minmax(220px, 0.65fr));
  gap: 18px;
  align-items: stretch;
}

.support-contact,
.qr-card {
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(210, 210, 215, 0.8);
  box-shadow: var(--shadow-md);
}

.support-contact {
  display: flex;
  min-height: 100%;
  flex-direction: column;
  justify-content: center;
  padding: 34px;
}

.support-contact span {
  color: var(--accent);
  font-size: 14px;
  font-weight: 700;
}

.support-contact a {
  width: fit-content;
  margin: 18px 0 16px;
  color: var(--ink);
  font-size: 30px;
  font-weight: 700;
  line-height: 1.15;
  overflow-wrap: anywhere;
}

.support-contact a:hover {
  color: var(--accent);
}

.support-contact p {
  margin-bottom: 0;
  font-size: 17px;
}

.qr-card {
  overflow: hidden;
}

.qr-card img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  background: #fff;
}

.qr-card div {
  padding: 24px;
}

.qr-card p {
  margin-bottom: 0;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 42px 0 58px;
  color: var(--muted);
}

.footer-brand {
  display: flex;
  gap: 16px;
  align-items: center;
}

.site-footer strong {
  color: var(--ink);
}

.icp-link {
  color: inherit;
  text-decoration: none;
  white-space: nowrap;
}

.icp-link:hover {
  color: var(--ink);
}

@media (max-width: 980px) {
  .split-section,
  .split-section.reverse,
  .product-story,
  .metric-grid,
  .card-grid,
  .support-layout {
    grid-template-columns: 1fr;
  }

  .copy-block,
  .section-heading {
    max-width: none;
  }

  .copy-block {
    order: 2;
  }

  .showcase-visual,
  .device-shot,
  .settings-shot {
    order: 1;
  }
}

@media (max-width: 640px) {
  .site-header,
  .hero,
  .asset-ribbon,
  .split-section,
  .overview-band,
  .product-story,
  .card-stage,
  .support-section,
  .site-footer {
    width: min(100% - 32px, 1200px);
  }

  .site-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    padding: 14px 0;
  }

  .nav {
    width: 100%;
    justify-content: space-between;
    gap: 10px;
  }

  .hero {
    padding-top: 34px;
  }

  .hero-lead {
    font-size: 18px;
  }

  h1 {
    font-size: 44px;
  }

  h2 {
    font-size: 34px;
  }

  .copy-block p {
    font-size: 16px;
  }

  .split-section,
  .product-story,
  .card-stage {
    padding: 74px 0;
  }

  .support-section {
    padding: 74px 0 58px;
  }

  .overview-band {
    padding: 72px 20px;
    border-radius: 28px;
  }

  .device-shot,
  .settings-shot,
  .hero-visual,
  .metric-grid article,
  .product-card,
  .support-contact,
  .qr-card {
    border-radius: 22px;
  }

  .support-contact {
    padding: 28px;
  }

  .support-contact a {
    font-size: 24px;
  }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }

  .footer-brand {
    align-items: flex-start;
    flex-direction: column;
    gap: 4px;
  }
}