/* Header - Navigation bar, logo, search form, and header layout */

header {
    position: relative;
    z-index: 1;
    height: 9rem;
}

header li {
    display: inline-block;
}

.header-a svg {
    color: var(--color-primary);
}

.logo-svg {
    width: var(--space-xl);
    height: var(--space-xl);
    transform: rotate(-15deg);
}

.header {
    overflow: hidden;
    padding: var(--grid-gutter);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-lg, 1.5rem);
    color: var(--color-foreground);
}

.header a {
    color: var(--color-foreground);
    text-align: center;
    text-decoration: none;
    border-radius: 4px;
}

.header a.logo {
    font-size: 25px;
    color: var(--color-foreground);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 var(--space-lg, 1.5rem);
    flex: 0 0 auto;
}

.header a:hover {
    color: var(--color-muted);
}

.header a.active {
    color: var(--color-muted);
}

.header-a, .header-b {
    display: flex;
    align-items: center;
    flex: 1 1 0;
}

.header-a {
    justify-content: flex-start;
    gap: var(--space-md, 1rem);
}

.header-b {
    justify-content: flex-end;
    gap: var(--space-sm, .75rem);
}

.header-a svg, .header-b svg {
    vertical-align: middle;
}

nav.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-m);
    padding: var(--space-xs) var(--grid-gutter);
    background-color: transparent;
}

nav.header .logo {
    flex-shrink: 0;
}

nav.header .logo-svg {
    height: 2rem;
    width: auto;
}

.search-form {
    flex: 1;
    max-width: 40rem;
    margin-inline: auto;
    display: flex;
    align-items: center;
    gap: var(--space-3xs);
}

.search-form .md3-field {
    flex: 1;
    margin-bottom: 0;
    min-block-size: 2.5rem;
    --field-size: 2.5rem;
}

.search-form .md3-field > input {
    min-block-size: 2.5rem;
    font-size: var(--step--1);
}

.search-form .md3-field > label {
    font-size: var(--step--1);
}

.search-form .md3-field:is(:focus-within, :has(input:not(:placeholder-shown))) > label {
    font-size: var(--step--2);
}

.search-form button {
    padding: var(--space-3xs) var(--space-s);
    background-color: var(--color-primary);
    color: var(--color-foreground-inverse);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-family: var(--font-family-san-serif);
    font-weight: 500;
    font-size: var(--step--1);
    transition: background-color 0.15s ease;
    align-self: stretch;
}

.search-form button:hover {
    opacity: 0.9;
}