.header {
  position: sticky;
  top: 0;
  z-index: 100;

  /*  すりガラス表現  */
  backdrop-filter: blur(16px) brightness(1.1);
  box-shadow: inset 0 -1px 0 rgb(255 255 255 / 0.1);
}
.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1600px;
  padding: 1em 1.5em;
  margin-inline: auto;
}

/* 以下、ダミーコンテンツ */
.header__logo {
  font-weight: 900;
  font-size: 1.5em;
  line-height: 1;
}
.header__nav {
  display: flex;
}
.header__nav > a {
  padding: 0.25em 0.5em;
  color: inherit;
}
.hero {
  width: 100%;
  aspect-ratio: 21/9;
}
.hero > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.section {
  min-height: 70vh;
  padding: 4em 1.5em;
}
.section > * {
  max-width: 1000px;
  margin-inline: auto;
}
.section:nth-child(2n) {
  background: #eee;
  background-image: radial-gradient(circle, #ddd 2px, transparent 0%);
  background-size: 20px 20px;
}
