:root {
  --sky-top: #ffffff;
  --sky-mid: #f6fbff;
  --sky-low: #eef7ff;
  --text: #122033;
  --muted: #5d6a79;
  --teal: #0f766e;
  --sky-blue: #69c6ff;
  --cyan-soft: rgba(105, 198, 255, 0.11);
  --violet-soft: rgba(167, 139, 250, 0.06);
  --font-sans: 'IBM Plex Sans', system-ui, sans-serif;
  --font-serif: 'Newsreader', Georgia, serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }

body {
  position: relative;
  overflow: hidden;
  font-family: var(--font-sans);
  color: var(--text);
  background: linear-gradient(180deg, var(--sky-top) 0%, var(--sky-mid) 56%, var(--sky-low) 100%);
}

.sky,
.cloud {
  position: fixed;
  inset: 0;
  pointer-events: none;
}

.sky-back {
  background:
    radial-gradient(circle at 18% 18%, var(--cyan-soft), transparent 24%),
    radial-gradient(circle at 82% 12%, var(--violet-soft), transparent 20%),
    radial-gradient(circle at 55% 74%, rgba(125, 211, 252, 0.045), transparent 20%);
  animation: sky-shift 26s ease-in-out infinite;
}

.sky-front {
  background: linear-gradient(180deg, rgba(255,255,255,0.34), rgba(255,255,255,0));
}

.cloud {
  opacity: 0.72;
  filter: blur(1px);
}

.cloud::before,
.cloud::after {
  content: "";
  position: absolute;
  background: rgba(255, 255, 255, 0.78);
  border-radius: 999px;
}

.cloud-a {
  top: 12%; left: -10%; width: 26rem; height: 9rem;
  animation: drift-a 42s linear infinite;
}
.cloud-a::before { inset: 16% 12% 22% 18%; }
.cloud-a::after { inset: 30% 0 10% 34%; }

.cloud-b {
  top: 26%; right: -8%; width: 22rem; height: 8rem;
  animation: drift-b 48s linear infinite;
}
.cloud-b::before { inset: 20% 18% 20% 12%; }
.cloud-b::after { inset: 34% 2% 10% 40%; }

.cloud-c {
  bottom: 20%; left: 8%; width: 18rem; height: 6rem;
  opacity: 0.5;
  animation: drift-c 54s linear infinite;
}
.cloud-c::before { inset: 18% 12% 20% 12%; }
.cloud-c::after { inset: 34% 0 8% 42%; }

.cloud-d {
  bottom: 10%; right: 12%; width: 14rem; height: 5rem;
  opacity: 0.42;
  animation: drift-d 58s linear infinite;
}
.cloud-d::before { inset: 20% 10% 24% 12%; }
.cloud-d::after { inset: 36% 0 8% 46%; }

.landing {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  max-width: clamp(20rem, 92vw, 70rem);
  margin: 0 auto;
  padding: clamp(5rem, 16vh, 9rem) clamp(1.5rem, 4vw, 3rem) clamp(4rem, 10vh, 7rem);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.signal-mark {
  width: clamp(3.5rem, 12vw, 5rem);
  height: clamp(3.5rem, 12vw, 5rem);
  margin-bottom: clamp(1.25rem, 3vw, 1.75rem);
  border-radius: 999px;
  background: rgba(255,255,255,0.74);
  border: 1px solid rgba(18, 32, 51, 0.08);
  box-shadow: inset 0 1px 0 rgba(255,255,255,0.95), 0 0.75rem 1.75rem rgba(126, 146, 173, 0.07);
  position: relative;
  backdrop-filter: blur(6px);
}

.signal-mark::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  box-shadow: 0 0 0 0 rgba(105, 198, 255, 0.34);
  animation: pulse-ring 4.8s ease-out infinite;
}

.signal-mark::after {
  content: "";
  position: absolute;
  inset: clamp(0.9rem, 3.5vw, 1.1rem);
  border-radius: 999px;
  border: 1.5px solid rgba(105, 198, 255, 0.32);
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--teal);
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 700;
}
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(4.25rem, 13vw, 9rem);
  line-height: 0.93;
  letter-spacing: -0.05em;
  font-weight: 500;
}

.tagline {
  max-width: 13ch;
  margin: clamp(1rem, 2vw, 1.25rem) auto;
  font-family: var(--font-serif);
  font-size: clamp(1.7rem, 4.4vw, 3.1rem);
  line-height: 1.06;
  letter-spacing: -0.035em;
  color: rgba(18, 32, 51, 0.95);
  font-weight: 400;
}

.lede {
  max-width: 40rem;
  margin: 0;
  font-family: var(--font-sans);
  color: var(--muted);
  font-size: clamp(1rem, 2vw, 1.15rem);
  line-height: 1.72;
}

@keyframes sky-shift {
  0%, 100% { transform: translate3d(0, 0, 0); }
  50% { transform: translate3d(0, -1.5%, 0); }
}

@keyframes drift-a {
  from { transform: translateX(0); }
  to { transform: translateX(18vw); }
}

@keyframes drift-b {
  from { transform: translateX(0); }
  to { transform: translateX(-16vw); }
}

@keyframes drift-c {
  from { transform: translateX(0); }
  to { transform: translateX(12vw); }
}

@keyframes drift-d {
  from { transform: translateX(0); }
  to { transform: translateX(-10vw); }
}

@keyframes pulse-ring {
  0% { box-shadow: 0 0 0 0 rgba(105, 198, 255, 0.30); }
  70% { box-shadow: 0 0 0 1.15rem rgba(105, 198, 255, 0); }
  100% { box-shadow: 0 0 0 0 rgba(105, 198, 255, 0); }
}

/* 768+ */
@media (min-width: 48rem) {
  .landing {
    padding-top: clamp(6rem, 17vh, 10rem);
    padding-bottom: clamp(5rem, 12vh, 8rem);
  }

  .cloud-a { width: 30rem; }
  .cloud-b { width: 25rem; }
  .cloud-c { width: 20rem; }
}

/* 1024+ */
@media (min-width: 64rem) {
  .landing {
    max-width: 74rem;
  }

  .tagline {
    max-width: 13ch;
  }
}

/* 1440+ */
@media (min-width: 90rem) {
  .landing {
    max-width: 80rem;
  }

  .cloud-a { width: 34rem; }
  .cloud-b { width: 28rem; }
}