:root {
  --ink: #10241f;
  --muted: #5a6e67;
  --paper: #f3f7f5;
  --qa: #0b3d36;
  --qa-mid: #1a6b5c;
  --jushi: #0a6ebd;
  --jushi-deep: #064a82;
  --line: rgba(16, 36, 31, 0.1);
  --max: 1120px;
  --font: "Noto Sans SC", "PingFang SC", sans-serif;
  --display: "Syne", "Noto Sans SC", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.top {
  position: fixed;
  inset: 0 0 auto;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 28px;
  background: rgba(243, 247, 245, 0.78);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
}
.brand {
  font-family: var(--display);
  font-weight: 800;
  letter-spacing: 0.02em;
  font-size: 18px;
}
.brand span {
  margin-left: 8px;
  font-family: var(--font);
  font-weight: 700;
  font-size: 15px;
  color: var(--qa);
}
.top nav {
  display: flex;
  gap: 18px;
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
}
.top nav a:hover { color: var(--ink); }

.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  place-items: center;
  padding: 96px 24px 72px;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(1200px 600px at 12% 18%, rgba(26, 107, 92, 0.35), transparent 60%),
    radial-gradient(900px 500px at 88% 22%, rgba(10, 110, 189, 0.28), transparent 55%),
    linear-gradient(165deg, #0b3d36 0%, #134f45 38%, #1a3a4a 72%, #0e2a38 100%);
  transform: scale(1.02);
  animation: drift 18s ease-in-out infinite alternate;
}
.hero-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(
      -12deg,
      transparent 0 14px,
      rgba(255, 255, 255, 0.025) 14px 15px
    );
  opacity: 0.7;
}
@keyframes drift {
  from { transform: scale(1.02) translate3d(0, 0, 0); }
  to { transform: scale(1.06) translate3d(-1.5%, 1%, 0); }
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 820px;
  text-align: center;
  color: #f4faf8;
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}
.hero-inner.in {
  opacity: 1;
  transform: none;
}
.hero-brand {
  margin: 0 0 18px;
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(28px, 5vw, 42px);
  letter-spacing: 0.04em;
}
.hero h1 {
  margin: 0 0 16px;
  font-size: clamp(28px, 5.4vw, 48px);
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: 0.01em;
}
.hero-lead {
  margin: 0 auto 28px;
  max-width: 34em;
  font-size: 16px;
  color: rgba(244, 250, 248, 0.82);
}
.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 18px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 700;
  border: 1px solid transparent;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-qa {
  background: #e7f4f0;
  color: var(--qa);
}
.btn-jushi {
  background: #e8f3fc;
  color: var(--jushi-deep);
}
.hero .btn-qa {
  background: #fff;
  color: var(--qa);
}
.hero .btn-jushi {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.45);
}
.hero .btn-jushi:hover {
  background: rgba(255, 255, 255, 0.12);
}

.product {
  padding: 88px 0 40px;
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.product.in {
  opacity: 1;
  transform: none;
}
.product-qa {
  background:
    linear-gradient(180deg, #eef6f3 0%, var(--paper) 40%, #e8f1ee 100%);
}
.product-jushi {
  background:
    linear-gradient(180deg, #eef4fa 0%, #f5f8fb 45%, #e8eef5 100%);
}
.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px 48px;
}

.eyebrow {
  margin: 0 0 8px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.product-qa .eyebrow { color: var(--qa-mid); }
.product-jushi .eyebrow { color: var(--jushi); }

.product h2 {
  margin: 0 0 14px;
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 900;
  display: flex;
  align-items: center;
  gap: 12px;
}
.product-qa h2 { color: var(--qa); }
.product-jushi h2 { color: var(--jushi-deep); }
.app-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  box-shadow: 0 8px 20px rgba(10, 110, 189, 0.18);
}
.lead {
  margin: 0 0 28px;
  max-width: 38em;
  font-size: 17px;
  color: var(--muted);
}

.feats {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: grid;
  gap: 16px;
  max-width: 40em;
}
.feats li {
  padding-left: 0;
}
.feats strong {
  display: block;
  margin-bottom: 4px;
  font-size: 16px;
}
.feats span {
  color: var(--muted);
  font-size: 14px;
}
.product-qa .feats strong { color: var(--qa); }
.product-jushi .feats strong { color: var(--jushi-deep); }

.how, .dl-note {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}
.dl-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}
.product-jushi .btn-jushi {
  background: var(--jushi);
  color: #fff;
}
.product-jushi .btn-jushi:hover {
  background: var(--jushi-deep);
}

.shot-rail {
  margin-top: 40px;
  display: grid;
  grid-template-columns: repeat(6, minmax(140px, 1fr));
  gap: 16px;
  align-items: end;
  overflow-x: auto;
  padding-bottom: 8px;
  scroll-snap-type: x mandatory;
}
.phone {
  margin: 0;
  border-radius: 22px;
  overflow: hidden;
  background: #111;
  box-shadow:
    0 18px 40px rgba(16, 36, 31, 0.14),
    0 0 0 1px rgba(255, 255, 255, 0.35) inset;
  scroll-snap-align: start;
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}
.phone.in {
  opacity: 1;
  transform: none;
}
.phone img {
  width: 100%;
  aspect-ratio: 9 / 16;
  object-fit: cover;
  object-position: top center;
  background: #dde6e2;
}
.tilt-a.in { transform: rotate(-1.2deg); }
.tilt-b.in { transform: rotate(1.2deg); }
.phone:nth-child(1).in { transition-delay: 0.05s; }
.phone:nth-child(2).in { transition-delay: 0.1s; }
.phone:nth-child(3).in { transition-delay: 0.15s; }
.phone:nth-child(4).in { transition-delay: 0.2s; }
.phone:nth-child(5).in { transition-delay: 0.25s; }
.phone:nth-child(6).in { transition-delay: 0.3s; }

.site-foot {
  padding: 36px 24px 48px;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
  background: #e7eeea;
}
.site-foot p { margin: 0 0 8px; }
.site-foot a:hover { color: var(--qa); text-decoration: underline; }

@media (max-width: 960px) {
  .shot-rail {
    grid-template-columns: repeat(6, minmax(160px, 180px));
  }
}
@media (max-width: 640px) {
  .top { padding: 12px 16px; }
  .top nav { gap: 12px; font-size: 13px; }
  .hero { padding: 88px 18px 64px; }
  .product { padding-top: 64px; }
  .wrap { padding: 0 16px 36px; }
}