css/header.css


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:root {
  --heading-height: 15em;
}
header {
  position: fixed;
  width: 100%;
  height: var(--heading-height);
}

[data-theme="light"],
:root:not([data-theme="dark"]) {
  --header-border-color: black;
  --header-border-thickness: 0.3em;
}

@media only screen and (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --header-border-color: white;
    --header-border-thickness: 0.2em;
  }
}

[data-theme="dark"] {
  --header-border-color: white;
  --header-border-thickness: 0.2em;
}

header::before {
  content: "";
  display: block;
  position: absolute;
  left: 0;
  bottom: 6em;
  width: 100%;
  height: calc(var(--heading-height) + 10em);
  z-index: -1;
  transform: skewY(-3.5deg);
  background: 
    linear-gradient(225deg, rgba(0, 0, 0, 0.55) 0%, rgba(0, 0, 0, 0.65) 100%),
    var(--banner-url) no-repeat center var(--scroll-percent);
  background-size: cover;
  border-bottom: var(--header-border-thickness) solid var(--header-border-color);
}

h1 {
  font-size: calc(0.8em + 2.6vw);
  font-weight: 700;
  letter-spacing: .01em;
  text-shadow: .05em .05em #111;
  color: #fff;
}

body {
    min-height: 100vh;
}

body > main {
  padding: var(--heading-height) 4em 0;
}

.site-title {
  margin: 0;
}

.nav-list {
  list-style: none;
  display: flex;
  gap: 1.5rem;
  padding: 0;
  margin: 0;
}

.header-aside {
  margin-left: auto;
  position: absolute;
  top: 0;
  right: 0;
}

.theme-dropdown summary {
  cursor: pointer;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: top;
  position: relative;

}

.header-main {
  display: flex;
  flex-direction: column;
}

.main-nav {
  margin-top: 0.5rem;
}

.dropdown-menu {
  display: flex;
  flex-direction: column;
}

.dropdown summary {
  border: none;
}

nav.theme-selector {
  position: absolute;
  top: 0;
  right: 0;
  z-index: 1000;
}

.theme-selector details summary {
  border-width: 2px;
}

.theme-selector {
  margin-top: 1em;
}

@media (max-width: var(--breakpoint-sm)) {
  .theme-selector {
    margin-top: 0.5em;
  }
}