* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: "Inter", "Noto Sans JP", sans-serif;
  overflow: hidden;
  background: #fff;
  color: #111;
}
.hero {
  width: 100%;
  min-height: 100svh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 32px;
  background: linear-gradient(180deg, #fff, #fafafa);
}
.hero-box {
  width: 100%;
  max-width: 720px;
  text-align: center;
  padding: 32px;
}

h1 {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.3;
  margin: 22px 0 18px;
  letter-spacing: -0.03em;
}
p {
  max-width: 520px;
  margin: 0 auto;
  color: #666;
  font-size: 12px;
  line-height: 1.9;
}
.btn-primary {
  display: inline-block;
  margin-top: 34px;
  padding: 14px 28px;
  border-radius: 999px;
  background: #111;
  color: #fff;
  text-decoration: none;
  font-size: 0.9rem;
  transition: 0.3s;
}
.btn-primary:hover {
  transform: translateY(-2px);
}
@media (max-width: 768px) {
  .hero-box {
    padding: 20px;
  }
  h1 {
    font-size: 1.8rem;
  }
  p {
    font-size: 0.88rem;
    line-height: 1.8;
  }
}