:root {
    --color-bg:      #ffffff;
    --color-surface: #ffffff;
    --color-ink:     #0b1f33;
    --color-navy:    #011e3d;
    --color-accent:  #e8791c;
    --color-benefit: #8a8f98;
    --color-line:    #e4e4e4;
    --color-muted:   #6b7280;

    --radius: 10px;
    --font-display: 'IBM Plex Sans', -apple-system, Segoe UI, Roboto, sans-serif;
    --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
}

@media (prefers-reduced-motion: no-preference) {
    .card, .overview-card, .deptswitch__tab { transition: transform .15s ease, box-shadow .15s ease, background-color .15s ease; }
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    background: var(--color-bg);
    color: var(--color-ink);
    font-family: var(--font-display);
}

a { color: inherit; text-decoration: none; }

/* ---------- Topbar ---------- */

.topbar {
    background: #ffffff;
    border-bottom: 1px solid var(--color-line);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2.5rem;
    flex-wrap: wrap;
    gap: .5rem;
}

.brand {
    display: flex;
    align-items: center;
    padding: .9rem 0;
}

.brand-logo {
    height: 52px;
    width: auto;
    display: block;
}

.deptswitch {
    display: flex;
    gap: .3rem;
    align-self: stretch;
}

.deptswitch__tab {
    display: flex;
    align-items: center;
    padding: 0 1.1rem;
    color: var(--color-muted);
    font-size: .92rem;
    font-weight: 600;
    border-bottom: 3px solid transparent;
    position: relative;
    top: 1px;
}

.deptswitch__tab:hover {
    color: var(--color-navy);
    background: rgba(1,30,61,.03);
}

.deptswitch__tab.is-active {
    color: var(--color-navy);
    border-bottom-color: var(--dept-color, var(--color-accent));
}

/* ---------- Content shell ---------- */

.content {
    max-width: 1600px;
    margin: 0 auto;
    padding: 3rem 3rem 4rem;
    min-height: calc(100vh - 130px);
}

/* ---------- Department header ---------- */

.deptheader {
    border-left: 6px solid var(--dept-color, var(--color-accent));
    padding-left: 1.3rem;
    margin-bottom: 2.5rem;
}

.deptheader h1 {
    margin: 0 0 .2rem;
    font-size: 2.4rem;
    letter-spacing: -.01em;
}

.deptheader p {
    margin: 0;
    color: var(--color-muted);
    font-family: var(--font-mono);
    font-size: .9rem;
}

/* ---------- Tool grid (department view) ---------- */

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
    gap: 1.4rem;
}

.card {
    background: var(--color-surface);
    border: 1px solid var(--color-line);
    border-top: 4px solid var(--dept-color, var(--color-accent));
    border-radius: var(--radius);
    padding: 2rem 1.2rem 1.5rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    justify-content: flex-start;
    gap: .5rem;
    min-height: 200px;
}

.card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 22px rgba(1,30,61,.12);
    border-color: var(--dept-color, var(--color-accent));
}

.card__icon {
    width: 76px;
    height: 76px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 14px;
    background: #fff;
    border: 1px solid var(--color-line);
    padding: 12px;
    margin-bottom: .6rem;
}

.card__icon img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.card__name {
    font-weight: 600;
    font-size: 1.15rem;
}

.card__arrow {
    margin-top: .6rem;
    font-size: .78rem;
    font-family: var(--font-mono);
    letter-spacing: .05em;
    text-transform: uppercase;
    color: var(--color-muted);
    opacity: .55;
}

.card:hover .card__arrow {
    color: var(--dept-color, var(--color-accent));
    opacity: 1;
}

/* ---------- Overview (root "/") ---------- */

.overview-hero {
    text-align: center;
    margin-bottom: 2.2rem;
}

.overview-hero h1 {
    margin: 0 0 .3rem;
    font-size: 2rem;
}

.overview-hero p {
    color: var(--color-muted);
    margin: 0;
}

.overview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.4rem;
}

.overview-card {
    background: var(--color-surface);
    border: 1px solid var(--color-line);
    border-top: 4px solid var(--dept-color, var(--color-accent));
    border-radius: var(--radius);
    padding: 1.8rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: .4rem;
}

.overview-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 24px rgba(1,30,61,.1);
}

.overview-card__index {
    font-family: var(--font-mono);
    font-size: .75rem;
    letter-spacing: .08em;
    color: var(--dept-color, var(--color-accent));
    font-weight: 700;
}

.overview-card__name {
    font-size: 1.25rem;
    font-weight: 600;
}

.overview-card__tagline {
    color: var(--color-muted);
    font-size: .88rem;
}

.overview-card__count {
    margin-top: .5rem;
    font-family: var(--font-mono);
    font-size: .75rem;
    color: var(--color-muted);
}

/* ---------- Benefits (globaler Bereich unter jeder Abteilung) ---------- */

.benefits-divider {
    border: none;
    border-top: 1px solid var(--color-line);
    margin: 3rem 0 2rem;
}

.benefits__title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-muted);
    text-transform: uppercase;
    letter-spacing: .06em;
    margin: 0 0 1.2rem;
}

/* ---------- 404 ---------- */

.notfound ul { padding-left: 1.2rem; }
.notfound a { color: var(--color-accent); font-weight: 600; }

/* ---------- Footer ---------- */

.footer {
    text-align: center;
    padding: 1.2rem 0 2rem;
    color: var(--color-muted);
    font-size: .78rem;
}

/* ---------- Mobile ---------- */

@media (max-width: 640px) {
    .topbar { flex-direction: column; align-items: flex-start; }
    .deptswitch { width: 100%; overflow-x: auto; }
    .content { padding: 1.5rem 1rem 2.5rem; }
}

/* ---------- Focus visibility ---------- */

a:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}