/* Demo-Institut – neutral layout, structure modelled on a typical university page */

:root {
    --color-primary: #1f4e5f;
    --color-primary-dark: #163843;
    --color-accent: #e0a526;
    --color-text: #1d2327;
    --color-muted: #5b6770;
    --color-border: #d9dee2;
    --color-bg-soft: #f3f5f6;
    --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --max-width: 1140px;
}

*, *::before, *::after { box-sizing: border-box; }

body {
    margin: 0;
    font-family: var(--font);
    font-size: 1.0625rem;
    line-height: 1.6;
    color: var(--color-text);
    background: #fff;
}

a { color: var(--color-primary); }
a:hover, a:focus { color: var(--color-primary-dark); }

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 16px;
}

.visually-hidden {
    position: absolute;
    width: 1px; height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
}

/* ---- Skip links (visible on keyboard focus only) ---- */
.skip-links a {
    position: absolute;
    left: -9999px;
    top: 0;
    z-index: 100;
    padding: 8px 12px;
    background: var(--color-accent);
    color: #000;
}
.skip-links a:focus { left: 8px; }

/* ---- Header ---- */
.topbar {
    background: var(--color-primary-dark);
    color: #fff;
    font-size: 0.875rem;
}
.topbar-inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 16px;
    min-height: 40px;
}
.topbar a { color: #fff; text-decoration: none; }
.topbar a:hover { text-decoration: underline; }

.demo-badge {
    margin-right: auto;
    padding: 2px 8px;
    border-radius: 3px;
    background: var(--color-accent);
    color: #000;
    font-weight: 600;
}

.language-menu {
    display: flex;
    gap: 8px;
    margin: 0;
    padding: 0;
    list-style: none;
}
.language-menu .active a { font-weight: 700; text-decoration: underline; }

.search input {
    width: 180px;
    padding: 3px 8px;
    border: 0;
    border-radius: 3px;
}

.brandbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding-top: 20px;
    padding-bottom: 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--color-text);
}
.logo-mark {
    display: grid;
    place-items: center;
    width: 48px; height: 48px;
    background: var(--color-primary);
    color: #fff;
    font-weight: 700;
    font-size: 1.25rem;
}
.logo-text { font-size: 1.25rem; font-weight: 600; }

.main-navigation ul {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin: 0;
    padding: 0;
    list-style: none;
}
.main-navigation a {
    display: block;
    padding: 8px 14px;
    text-decoration: none;
    font-weight: 600;
    color: var(--color-text);
    border-bottom: 3px solid transparent;
}
.main-navigation a:hover,
.main-navigation .active a { border-bottom-color: var(--color-primary); }

/* ---- Breadcrumb ---- */
.breadcrumb {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding-top: 10px;
    padding-bottom: 10px;
    font-size: 0.875rem;
    color: var(--color-muted);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}
.breadcrumb ol {
    display: flex;
    flex-wrap: wrap;
    margin: 0;
    padding: 0;
    list-style: none;
}
.breadcrumb li + li::before { content: "›"; margin: 0 8px; }

/* ---- Page body: sub navigation + content ---- */
.page-body {
    display: grid;
    grid-template-columns: 1fr;
    gap: 32px;
    padding-top: 32px;
    padding-bottom: 48px;
}
@media (min-width: 900px) {
    .page-body:has(.sub-navigation) { grid-template-columns: 240px 1fr; }
}

.sub-navigation ul { margin: 0; padding: 0; list-style: none; }
.sub-navigation ul ul { padding-left: 16px; }
.sub-navigation a {
    display: block;
    padding: 8px 12px;
    text-decoration: none;
    color: var(--color-text);
    border-left: 3px solid var(--color-border);
}
.sub-navigation .active > a { border-left-color: var(--color-primary); }
.sub-navigation .current > a { background: var(--color-bg-soft); font-weight: 700; }

.content { min-width: 0; }
.content h1 { margin: 0 0 4px; font-size: 2.25rem; line-height: 1.2; color: var(--color-primary-dark); }
.content .subtitle { margin: 0 0 24px; color: var(--color-muted); }
.content h2 { margin-top: 40px; font-size: 1.6rem; color: var(--color-primary-dark); }
.content h3 { margin-top: 32px; font-size: 1.25rem; }
.content .frame { margin-bottom: 24px; }

/* Image placeholder and contact box (HTML content elements) */
.placeholder-image {
    display: grid;
    place-items: center;
    aspect-ratio: 16 / 6;
    background: repeating-linear-gradient(45deg, var(--color-bg-soft), var(--color-bg-soft) 12px, #e8ecee 12px, #e8ecee 24px);
    color: var(--color-muted);
    font-weight: 600;
}
.placeholder-caption { font-size: 0.85rem; color: var(--color-muted); }

.contact-box {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    padding: 20px;
    background: var(--color-bg-soft);
}
.contact-photo {
    width: 120px; height: 150px;
    display: grid;
    place-items: center;
    background: #dfe4e7;
    color: var(--color-muted);
    font-size: 0.8rem;
}

/* Experiment: consent box, then the iframe */
.consent-box {
    padding: 20px 24px;
    background: var(--color-bg-soft);
    border-left: 4px solid var(--color-primary);
}
.consent-box h2 { margin-top: 0; }
.consent-check {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    margin: 16px 0;
    font-weight: 600;
}
.consent-check input { width: 20px; height: 20px; margin-top: 4px; flex: none; }
.consent-button {
    padding: 10px 20px;
    border: 0;
    background: var(--color-primary);
    color: #fff;
    font: inherit;
    font-weight: 600;
    cursor: pointer;
}
.consent-button:disabled { background: #9aa6ad; cursor: not-allowed; }

.experiment-frame {
    border: 1px solid var(--color-border);
    background: #000;
}
.experiment-frame iframe {
    display: block;
    width: 100%;
    height: 85vh;
    min-height: 720px;   /* the PsychoJS start dialog needs about 650px */
    border: 0;
}
.experiment-hint {
    padding: 12px 16px;
    background: #fff8e6;
    border-left: 4px solid var(--color-accent);
}

/* ---- Footer ---- */
.site-footer {
    background: var(--color-primary-dark);
    color: #e6ecef;
    font-size: 0.95rem;
}
.site-footer a { color: #fff; }
.site-footer h2 { font-size: 1rem; text-transform: uppercase; letter-spacing: 0.05em; }
.footer-columns {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
    padding-top: 32px;
    padding-bottom: 24px;
}
.footer-columns ul { margin: 0; padding: 0; list-style: none; }
.footer-columns address { font-style: normal; }
.footer-note {
    padding-top: 12px;
    padding-bottom: 16px;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    font-size: 0.85rem;
}