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

html {
  scroll-behavior: smooth;
}

body {
  background: #fff;
  color: #000;
  font-family: Genos, sans-serif;
  -webkit-font-smoothing: antialiased;
}

#particles {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.hero {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 6rem 2rem 4rem;
  overflow: hidden;
}

.hero-copy {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2.25rem;
  width: min(92vw, 42rem);
  opacity: 0;
  animation: fade-up 0.8s ease 0.15s forwards;
}

.testimonials {
  position: relative;
  z-index: 1;
}

header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.75rem 2rem;
  background: #fff;
  opacity: 0;
  animation: fade-in 0.7s ease forwards;
}

.logo {
  color: #000;
  text-decoration: none;
  font-weight: 600;
  font-size: clamp(1.35rem, 2.4vw, 1.85rem);
  letter-spacing: 0.06em;
  line-height: 1;
}

nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

nav a {
  color: #000;
  text-decoration: none;
  font-weight: 400;
  font-size: 0.95rem;
  letter-spacing: 0.1em;
  transition: opacity 0.2s ease;
}

nav a:hover,
nav a:focus-visible {
  opacity: 0.45;
  outline: none;
}

.tagline {
  font-family: Inter, sans-serif;
  width: 100%;
  text-align: left;
  font-weight: 900;
  font-size: clamp(2.5rem, 6.5vw, 4.5rem);
  letter-spacing: -0.03em;
  line-height: 1.05;
  color: #000;
}

.subhead {
  font-family: Inter, sans-serif;
  width: 100%;
  max-width: 28rem;
  text-align: left;
  font-weight: 400;
  font-size: clamp(1rem, 2vw, 1.2rem);
  letter-spacing: -0.01em;
  line-height: 1.4;
  color: #000;
  opacity: 0.55;
  margin-top: -1.1rem;
}

#partner {
  appearance: none;
  background: #000;
  color: #fff;
  border: 1px solid #000;
  font-family: Inter, sans-serif;
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  padding: 0.95rem 2.5rem;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease;
}

#partner:hover,
#partner:focus-visible {
  background: #fff;
  color: #000;
  outline: none;
}

#partner:active {
  transform: scale(0.97);
}

.testimonials {
  max-width: 40rem;
  margin: 0 auto;
  padding: 4rem 2rem 6rem;
  display: flex;
  flex-direction: column;
  gap: 3.5rem;
}

.testimonials blockquote p {
  font-weight: 300;
  font-size: clamp(1.05rem, 2.2vw, 1.25rem);
  letter-spacing: 0.02em;
  line-height: 1.55;
}

.testimonials footer {
  margin-top: 1.25rem;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 0.85rem;
}

.testimonials cite {
  font-style: normal;
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
}

.testimonials footer span {
  font-weight: 300;
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  opacity: 0.55;
}

@keyframes fade-in {
  to {
    opacity: 1;
  }
}

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

  header,
  .hero-copy {
    animation: none;
    opacity: 1;
  }
}

@media (max-width: 480px) {
  header {
    padding: 1.25rem;
  }

  nav {
    gap: 1rem;
  }

  nav a {
    font-size: 0.85rem;
    letter-spacing: 0.06em;
  }

  .hero-copy {
    width: min(92vw, 42rem);
    gap: 1.75rem;
  }

  .tagline {
    letter-spacing: -0.02em;
  }

  .testimonials {
    padding: 3rem 1.25rem 4.5rem;
    gap: 2.75rem;
  }
}