* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  color: #fff;
  font-family: Inter, Arial, sans-serif;
  background:
    radial-gradient(circle at 50% 20%, rgba(48, 151, 255, .28), transparent 35%),
    linear-gradient(135deg, #06152d 0%, #082d5a 48%, #061b38 100%);
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(120deg, rgba(255,255,255,.04), transparent 35%, rgba(73,169,255,.04));
}

.header {
  position: relative;
  z-index: 5;
  height: 86px;
  padding: 12px 5%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid rgba(255,255,255,.08);
  background: rgba(3, 15, 34, .42);
  backdrop-filter: blur(14px);
}

.brand img {
  width: 155px;
  height: 62px;
  object-fit: contain;
  display: block;
}

.nav {
  display: flex;
  gap: 34px;
}

.nav a {
  color: rgba(255,255,255,.86);
  text-decoration: none;
  font-weight: 600;
  transition: .2s ease;
}

.nav a:hover {
  color: #54b7ff;
}

.hero {
  min-height: calc(100vh - 86px);
  display: grid;
  place-items: center;
  padding: 70px 20px 100px;
  position: relative;
  z-index: 1;
}

.hero-content {
  max-width: 820px;
  text-align: center;
  animation: appear .8s ease both;
}

h1 {
  font-size: clamp(52px, 9vw, 104px);
  line-height: .95;
  letter-spacing: -4px;
  font-weight: 900;
  text-shadow: 0 15px 45px rgba(0,0,0,.25);
}

h1 span {
  color: #ffd51c;
}

.hero p {
  max-width: 650px;
  margin: 28px auto 34px;
  color: rgba(231,243,255,.75);
  line-height: 1.75;
  font-size: 17px;
}

.buttons {
  display: flex;
  justify-content: center;
}

.download-btn {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: #04162d;
  background: linear-gradient(135deg, #64c5ff, #258cf1);
  text-decoration: none;
  font-weight: 800;
  padding: 16px 28px;
  border-radius: 13px;
  box-shadow: 0 12px 35px rgba(25, 141, 239, .25);
  transition: transform .2s ease, box-shadow .2s ease;
}

.download-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 17px 40px rgba(25, 141, 239, .38);
}

.download-btn span {
  font-size: 12px;
}

.hint {
  margin-top: 15px;
  font-size: 12px;
  color: rgba(255,255,255,.4);
}

footer {
  padding: 25px;
  text-align: center;
  color: rgba(255,255,255,.35);
  font-size: 12px;
  border-top: 1px solid rgba(255,255,255,.06);
}

.background-glow {
  position: fixed;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  filter: blur(100px);
  opacity: .18;
  pointer-events: none;
}

.glow-1 {
  background: #008cff;
  top: 10%;
  left: -180px;
}

.glow-2 {
  background: #1e75ff;
  right: -180px;
  bottom: 5%;
}

@keyframes appear {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 650px) {
  .header {
    height: 76px;
    padding: 8px 18px;
  }

  .brand img {
    width: 120px;
    height: 58px;
  }

  .nav {
    gap: 16px;
    font-size: 14px;
  }

  .hero {
    min-height: calc(100vh - 76px);
    padding: 50px 18px 80px;
  }

  h1 {
    letter-spacing: -2px;
  }

  .hero p {
    font-size: 15px;
  }
}