html, body {
  margin: 0;
  background: radial-gradient(circle at center, #05091a, #02040a);
  overflow: hidden;
}

canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
}

.overlay {
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at left center, rgba(0,0,0,0.55), rgba(0,0,0,0.15));
  z-index: 1;
}

.ui {
  position: relative;
  z-index: 2;
  width: 100vw;
  height: 100vh;
  color: #fff;
  font-family: Inter, system-ui, sans-serif;
}

.top {
  position: fixed;
  top: 24px;
  left: 24px;
  right: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 4;
}

.logo {
  font-weight: 700;
  letter-spacing: 0.12em;
  font-size: 0.9rem;
}

.burger {
  width: 28px;
  height: 18px;
  display: none;
  flex-direction: column;
  justify-content: space-between;
  cursor: pointer;
}

.burger span {
  height: 2px;
  background: #fff;
  opacity: 0.8;
}

.hero {
  position: absolute;
  inset: 0;
  max-width: 520px;
  padding: 120px 100px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transform: translateY(40px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.hero.active {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.hero .section {
  font-size: 4.5rem;
  opacity: 0.2;
}

.hero h1 {
  font-size: 2.8rem;
  margin: 0 0 20px;
}

.hero p {
  line-height: 1.7;
  opacity: 0.9;
}

.start {
  margin-top: 28px;
  padding: 14px 22px;
  background: transparent;
  border: 1px solid rgba(255,255,255,0.35);
  color: #fff;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: all 0.3s ease;
  width: fit-content;
  text-decoration: none;
}

.start:hover {
  border-color: #1e90ff;
  color: #1e90ff;
  background-color: rgba(255,210,77,0.08);
}

.side {
  position: fixed;
  right: 48px;
  top: 50%;
  transform: translateY(-50%);
  text-align: right;
  z-index: 3;
}

.side span {
  display: block;
  margin: 14px 0;
  opacity: 0.4;
  font-size: 0.8rem;
  cursor: pointer;
}

.side .active {
  opacity: 1;
  color: #1e90ff;
}

.mobile-menu {
  position: fixed;
  inset: 0;
  background: rgba(2,4,10,0.96);
  z-index: 5;
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.mobile-menu span {
  font-size: 1.4rem;
  margin: 14px 0;
  opacity: 0.9;
  cursor: pointer;
}

a {
  word-wrap: break-word;
  color: white;
  text-decoration: none;
  padding: 2px;
}

@media (max-width: 900px) {
  .hero {
    padding: 96px 32px;
    max-width: none;
  }

  .side {
    display: none;
  }

  .burger {
    display: flex;
  }
}