* { box-sizing: border-box; }
/* Die Kontoeinstellungen können die Breite zentral am Dokument umschalten. */
:root {
    --scrollbar-style: auto;
    --scrollbar-size: 14px;
    --scrollbar-thumb-border: 3px;
    scroll-padding-block-start: calc(var(--site-header-height, 6rem) + 0.75rem);
}
:root[data-scrollbar="thin"] { --scrollbar-style:thin; --scrollbar-size:8px; --scrollbar-thumb-border:2px; }
:root[data-scrollbar="wide"] { --scrollbar-style:auto; --scrollbar-size:14px; --scrollbar-thumb-border:3px; }

/* Auch kleine Mausfenster und Touch-Geräte mit Maus verwenden die Einstellung.
   Ohne präzisen Zeiger oder bei System-Kontrastfarben bleibt alles nativ. */
@media (any-pointer: fine) and (forced-colors: none) {
    * { scrollbar-width: var(--scrollbar-style, auto); }
    :root { scrollbar-color: var(--color-accent) var(--color-surface); }
    *::-webkit-scrollbar { display: block; }
    /* Fallback für Browser ohne standardisiertes scrollbar-color. */
    @supports not (scrollbar-color: red white) {
        ::-webkit-scrollbar { width: var(--scrollbar-size); height: var(--scrollbar-size); }
        ::-webkit-scrollbar-track, ::-webkit-scrollbar-corner { background: var(--color-surface); }
        ::-webkit-scrollbar-thumb {
            background: var(--color-accent);
            border: var(--scrollbar-thumb-border) solid var(--color-surface);
            border-radius: 999px;
        }
        ::-webkit-scrollbar-thumb:hover { background: var(--color-accent-hover); }
        ::-webkit-scrollbar-button { display: none; width: 0; height: 0; }
    }
}
.scrollbar-measure {
    position: fixed;
    left: -9999px;
    top: 0;
    width: 100px;
    height: 100px;
    padding: 0;
    border: 0;
    overflow: scroll;
    visibility: hidden;
    pointer-events: none;
    contain: strict;
}

body {
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    margin: 0;
    color: var(--color-text);
    background: var(--color-background);
    font-family: var(--font-body);
    line-height: 1.5;
}
a { color: var(--color-accent); }
button, summary, [role="button"], .button,
input[type="button"], input[type="submit"], input[type="reset"],
nav a, .site-brand, .notifications-all {
    -webkit-user-select: none;
    user-select: none;
}
.page-container {
    /* Nur fehlende Scrollbar-Breite ausgleichen; Hintergründe bleiben vollflächig. */
    --scrollbar-compensation: max(0px, calc(var(--scrollbar-width, 0px) - (100vw - 100%)));
    width: min(calc(100% - var(--scrollbar-compensation)), var(--page-width));
    margin-inline-start: max(0px, calc((100% - var(--scrollbar-compensation) - var(--page-width)) / 2));
    margin-inline-end: auto;
    padding: var(--space-medium);
}
main.page-container { flex: 1; padding-block: 1.5rem; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 40;
    flex-shrink: 0;
    background: var(--color-background);
    border-top: 4px solid var(--color-accent);
    border-bottom: 1px solid var(--color-border);
}
.header-content { display: flex; align-items: center; justify-content: space-between; gap: var(--space-medium); flex-wrap: wrap; }
.site-brand { display: inline-flex; align-items: center; gap: 0.375rem; font-size: 1.25rem; font-weight: 700; text-decoration: none; }
.site-brand img { display: block; object-fit: contain; }
.site-nav { display: flex; align-items: center; gap: var(--space-medium); flex-wrap: wrap; }
.site-nav a { padding: var(--space-small); font: inherit; color: var(--color-text); text-decoration: none; }
.site-nav a[aria-current="page"] { color: var(--color-accent); text-decoration: underline; text-underline-offset: 0.4rem; }
.site-nav a:hover { color: var(--color-accent-hover); }
.site-footer {
    border-top: 1px solid var(--color-border);
    color: var(--color-muted);
    background: var(--color-surface);
}
.footer-content {
    display: grid;
    grid-template-columns: 1fr;
    align-items: center;
    gap: var(--space-small);
    padding-block: 1.25rem;
    font-size: 0.875rem;
    text-align: center;
}
.footer-copyright, .footer-project { margin: 0; }
.footer-copyright { justify-self: center; white-space: nowrap; }
.footer-nav { justify-self: center; display: flex; flex-direction: column; gap: 0.25rem; }
.footer-nav-row { display: flex; justify-content: center; flex-wrap: wrap; gap: 0.25rem var(--space-medium); }
.footer-nav a { display: inline-flex; align-items: center; min-height: 2.75rem; padding-block: 0.5rem; color: inherit; text-underline-offset: 0.2rem; }
.footer-nav a:hover { color: var(--color-accent-hover); }
.footer-project { justify-self: center; text-align: center; }
@media (min-width: 48rem) {
    main.page-container { padding-block: var(--space-large); }
    .site-brand { gap: var(--space-small); font-size: 1.5rem; }
    .footer-content { grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr); text-align: left; gap: var(--space-medium); }
    .footer-copyright { justify-self: start; }
    .footer-project { justify-self: end; text-align: right; }
    .footer-project-institution { display: block; white-space: nowrap; }
    .footer-nav-row { column-gap:1.5rem; }
    .footer-nav-row>:is(a,button) { position:relative; }
    .footer-nav-row>:is(a,button)+:is(a,button)::before {
        content:""; position:absolute; inset-inline-start:-.75rem; top:50%;
        height:.875rem; border-inline-start:1px solid var(--color-control-subtle);
        transform:translateY(-50%);
    }
}
.skip-link { position: fixed; z-index: 50; top: -10rem; left: var(--space-medium); }
.skip-link:focus {
    top: var(--space-small);
    padding: var(--space-small);
    background: var(--color-background);
}
.form-panel { max-width: 28rem; margin: var(--space-medium) auto; }
@media (min-width: 48rem) {
    .form-panel { margin-block: var(--space-large); }
}
.eyebrow { color: var(--color-accent); font-weight: 600; }
h1 { margin-block: 0 var(--space-medium); font-size: clamp(1.8rem, 5vw, 2.5rem); line-height: 1.2; overflow-wrap: anywhere; }
.intro-text { color: var(--color-muted); }
.information-page { max-width: 48rem; overflow-wrap: anywhere; }
.information-date { color: var(--color-muted); font-size: 0.875rem; }
.information-page > section { margin-block-start: var(--space-large); }
.information-page h2 { margin-block: 0 var(--space-small); font-size: 1.25rem; line-height: 1.35; }
.information-page p, .information-page ul, .information-page dl { margin-block: var(--space-medium); }
.information-page li + li { margin-block-start: var(--space-small); }
.information-page ul { padding-inline-start: 1.25rem; }
.information-page address { font-style: normal; }
.information-note { padding: var(--space-medium); background: var(--color-surface); border-left: 3px solid var(--color-control-border); }
.information-list dt { font-weight: 600; }
.information-list dd { margin: var(--space-small) 0 var(--space-medium); }
.information-return { padding-block-start: var(--space-medium); border-top: 1px solid var(--color-border); }
.information-page kbd { font: inherit; font-weight: 600; }
.form-field { margin-block: 1.25rem; }
.form-field label { display: block; margin-bottom: var(--space-small); font-weight: 600; }
.form-help { font-size:.875rem; color:var(--color-muted); margin-top:.5rem; }
.form-help ul { padding-left:1.25rem; }
.form-panel input:not([type="hidden"]), .form-panel select, .form-panel textarea {
    display: block;
    width: 100%;
    min-height: 2.75rem;
    padding: 0.75rem;
    border: 1px solid var(--color-control-border);
    border-radius: var(--radius-control);
    font: inherit;
    color: var(--color-text);
    background: var(--color-background);
}
.form-panel textarea { resize:vertical; }
.form-panel :is(input,textarea,select)[aria-invalid="true"] { border-color:var(--color-error); }
.button {
    min-height: 2.75rem;
    padding: var(--space-small) var(--space-medium);
    /* Im normalen Design unsichtbar; System-Kontrastfarben machen ihn erkennbar. */
    border: 1px solid transparent;
    border-radius: var(--radius-control);
    background: var(--color-accent);
    color: var(--color-on-accent);
    font: inherit;
    cursor: pointer;
}
.button:hover { background: var(--color-accent-hover); }
.form-panel .button { width: 100%; }
.form-panel button:disabled { opacity:.65; cursor:not-allowed; }
:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 3px; }
.errorlist, .form-error { color: var(--color-error); }
.form-error { border-left: 3px solid var(--color-error); padding: var(--space-medium); background: var(--color-surface); }

.error-page { max-width: 42rem; margin: clamp(1rem, 6vh, 4rem) auto; text-align: center; }
.error-code { margin: 0 0 var(--space-medium); color: var(--color-accent); font-size: clamp(4.5rem, 18vw, 8rem); font-weight: 700; line-height: 1; }
.error-page .intro-text { font-size: 1.125rem; }
.error-home-link { display: inline-flex; align-items: center; justify-content: center; margin-top: var(--space-medium); text-decoration: none; }