#blazor-error-ui {
    color-scheme: light only;
    background: lightyellow;
    bottom: 0;
    box-shadow: 0 -1px 2px rgba(0, 0, 0, 0.2);
    box-sizing: border-box;
    display: none;
    left: 0;
    padding: 0.6rem 1.25rem 0.7rem 1.25rem;
    position: fixed;
    width: 100%;
    z-index: 1000;
}

    #blazor-error-ui .dismiss {
        cursor: pointer;
        position: absolute;
        right: 0.75rem;
        top: 0.5rem;
    }

/* Header: pinned to the top while the page scrolls, so the brand and (on mobile)
   the hamburger button are always reachable. It is a plain block child of <body>
   (NOT a flex item) -- a stretched flex child fills its cell and never sticks.
   z-index keeps it above the content; the opaque background stops content showing
   through as it scrolls underneath. */
.site-header {
    /* Brand-blue bar with a warm accent underline -- the strongest, most visible
       cue that carries the friendly tone across every page. Uses its own header
       token so it stays deep blue in dark mode too (see app.css). */
    background: var(--color-header);
    border-bottom: 3px solid var(--color-accent);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 20;
}

.header-inner {
    max-width: var(--content-width);
    margin: 0 auto;
    padding: var(--space-3) 1.25rem;
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: var(--space-2) var(--space-4);
}

.brand {
    font-size: 1.35rem;
    font-weight: 700;
    color: #fff;
    text-decoration: none;
    white-space: nowrap;
}

.main-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem 1.25rem;
}

/* The hamburger button, its state checkbox, and the mobile-only home link are
   hidden on wide screens; the media query below turns them on for narrow ones.
   (On wide screens the brand is the home link, so a "Start" entry is redundant.) */
.nav-toggle,
.nav-toggle-label,
.nav-home-mobile {
    display: none;
}

/* The link colours/states for .main-nav a live in the GLOBAL app.css, not here.
   Reason: NavLink renders plain <a> elements that carry no scoped-CSS attribute
   (b-xxxxx), so a scoped rule ".main-nav a" would not match them. See app.css. */

/* Content: at least tall enough that the footer sits at the bottom of the viewport
   on short pages. 100dvh - 4rem leaves room for the header (which sits above in
   normal flow); dvh follows the mobile browser's shrinking toolbar. On long pages
   the content simply grows past this and pushes the footer down naturally. */
.content {
    min-height: calc(100dvh - 4rem);
    box-sizing: border-box;
    width: 100%;
    max-width: var(--content-width);
    margin: 0 auto;
    padding: var(--space-4) 1.25rem var(--space-6);
}

/* Footer */
.site-footer {
    border-top: 1px solid var(--color-border);
    background: var(--color-surface);
    color: var(--color-text-soft);
    font-size: 0.9rem;
}

.footer-inner {
    max-width: var(--content-width);
    margin: 0 auto;
    padding: var(--space-3) 1.25rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: var(--space-2) var(--space-4);
}

.footer-nav {
    display: flex;
    gap: var(--space-4);
}

.footer-nav a {
    color: var(--color-text-soft);
    text-decoration: none;
}

.footer-nav a:hover {
    color: var(--color-brand);
    text-decoration: underline;
}

/* Mobile: on narrow screens the nav collapses behind a hamburger button. This is
   pure CSS -- the #nav-toggle checkbox holds the open/closed state and its
   :checked state reveals the nav. No JavaScript, so it works under static SSR. */
@media (max-width: 40rem) {
    /* The brand stays on the left, the hamburger goes to the right, and the nav
       occupies its own full-width row below both. */
    .header-inner {
        flex-wrap: wrap;
        align-items: center;
        justify-content: space-between;
    }

    /* Show the hamburger button. */
    .nav-toggle-label {
        display: block;
        cursor: pointer;
        padding: 0.5rem;
        margin: -0.5rem;   /* keep the tap target large without shifting layout */
    }

    /* The three-bar icon, drawn with one element plus its ::before/::after. */
    .nav-toggle-bar,
    .nav-toggle-bar::before,
    .nav-toggle-bar::after {
        display: block;
        width: 1.5rem;
        height: 2px;
        background: #fff;   /* on the blue header bar */
        content: "";
    }

    .nav-toggle-bar::before {
        transform: translateY(-6px);
    }

    .nav-toggle-bar::after {
        transform: translateY(4px);   /* 6px minus the bar's own 2px height */
    }

    /* The nav takes its own row and is hidden until the checkbox is checked. */
    .main-nav {
        flex-basis: 100%;
        flex-direction: column;
        gap: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.2s ease;
    }

    /* Checked state: reveal the stacked links. The max-height caps the open menu
       to the space below the sticky header; a longer list scrolls inside it
       instead of running off the screen. */
    .nav-toggle:checked ~ .main-nav {
        max-height: 70vh;
        overflow-y: auto;
        margin-top: 0.5rem;
    }

    /* The mobile-only home link reappears as the first entry in the menu. */
    .nav-home-mobile {
        display: block;
    }

    /* Mobile per-link spacing/separators for .main-nav a are in the global app.css
       too, for the same scoped-attribute reason as above. */
}