.site-header {
    position: sticky;
    top: 0;
    z-index: 101;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px var(--pad);
    border-bottom: 1px solid var(--border);
    background: rgba(17,17,22,.80);
    backdrop-filter: blur(18px);
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    position: relative;
    z-index: 102;
}

.brand-mark {
    width: 46px;
    height: 46px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    background: var(--accent);
    color: #111116;
    font-size: .82rem;
    font-weight: 900;
    letter-spacing: -.04em;
    transform: rotate(-7deg);
}

.brand-copy {
    display: grid;
}

.brand-copy strong {
    font-size: .88rem;
    text-transform: uppercase;
    letter-spacing: .08em;
}

.brand-copy small {
    color: var(--text-muted);
    font-size: .7rem;
    letter-spacing: .12em;
    text-transform: uppercase;
}

.menu-toggle {
    position: relative;
    z-index: 102;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: transparent;
    color: var(--text);
    border: 1px solid var(--border-strong);
    border-radius: 999px;
    cursor: pointer;
}

.menu-toggle span {
    margin-right: 4px;
    font-size: .72rem;
    letter-spacing: .14em;
    font-weight: 800;
}

.menu-toggle i {
    display: block;
    width: 14px;
    height: 1px;
    background: currentColor;
    transition: transform .25s ease;
}

.menu-open .menu-toggle i:nth-of-type(1) {
    transform: translate(3px, 2px) rotate(45deg);
}

.menu-open .menu-toggle i:nth-of-type(2) {
    transform: translate(-3px, -2px) rotate(-45deg);
}

.main-nav {
    position: fixed;
    inset: 0;
    z-index: 100;
    width: 100vw;
    height: 100dvh;
    padding: 110px var(--pad) 35px;
    background:
        radial-gradient(circle at 80% 15%, rgba(169,120,255,.18), transparent 28rem),
        var(--bg);
    transform: translateY(-105%);
    visibility: hidden;
    pointer-events: none;
    transition:
        transform .5s cubic-bezier(.76,0,.24,1),
        visibility 0s linear .5s;
    overflow-y: auto;
    overscroll-behavior: contain;
}

.menu-open .main-nav {
    transform: translateY(0);
    visibility: visible;
    pointer-events: auto;
    transition:
        transform .5s cubic-bezier(.76,0,.24,1),
        visibility 0s;
}

.main-nav-inner {
    max-width: var(--container);
    margin: 0 auto;
}

.main-nav-kicker {
    margin-bottom: 24px;
    color: var(--text-muted);
    font-size: .72rem;
    letter-spacing: .16em;
    text-transform: uppercase;
}

.nav-item {
    display: grid;
    grid-template-columns: 55px 1fr auto;
    align-items: center;
    min-height: clamp(52px, 5vw, 76px);
    border-top: 1px solid var(--border);
    transition: color .2s ease, padding-left .2s ease;
}

.nav-item:last-of-type {
    border-bottom: 1px solid var(--border);
}

.nav-item:hover,
.nav-item.is-active {
    color: var(--accent);
    padding-left: 8px;
}

.nav-index {
    color: var(--text-muted);
    font-size: .68rem;
    letter-spacing: .12em;
}

.nav-label {
    font-size: clamp(1.5rem, 3.1vw, 3.3rem);
    font-weight: 780;
    letter-spacing: -.045em;
}

.nav-arrow {
    font-size: 1.5rem;
}

.main-nav-meta {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    padding-top: 22px;
    color: var(--text-muted);
    font-size: .68rem;
    letter-spacing: .12em;
}

.page-hero {
    max-width: var(--container);
    margin: 0 auto;
    padding: clamp(70px, 10vw, 150px) var(--pad) clamp(60px, 9vw, 120px);
    display: grid;
    grid-template-columns: minmax(60px, 150px) 1fr;
    gap: 24px;
}

.page-number {
    color: var(--accent-secondary);
    font-size: .76rem;
    letter-spacing: .18em;
    padding-top: 14px;
}

.page-hero h1 {
    margin: 14px 0 24px;
    max-width: 1100px;
    font-size: clamp(3.2rem, 10vw, 9.5rem);
    line-height: .85;
    letter-spacing: -.075em;
    text-wrap: balance;
}

.placeholder-section {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 var(--pad) clamp(80px, 10vw, 160px);
}

.placeholder-card {
    padding: clamp(28px, 5vw, 64px);
    border: 1px solid var(--border);
    border-radius: var(--radius-l);
    background: linear-gradient(135deg, rgba(255,255,255,.035), rgba(255,255,255,.012));
    box-shadow: var(--shadow);
}

.placeholder-card h2 {
    margin: 18px 0 12px;
    max-width: 700px;
    font-size: clamp(2rem, 5vw, 4.6rem);
    line-height: .95;
    letter-spacing: -.055em;
}

.placeholder-card p {
    max-width: 700px;
    color: var(--text-muted);
    line-height: 1.7;
}

.site-footer {
    margin-top: 40px;
    border-top: 1px solid var(--border);
    padding: clamp(50px, 7vw, 100px) var(--pad) 32px;
}

.footer-top,
.footer-bottom {
    max-width: var(--container);
    margin: 0 auto;
}

.footer-top {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 30px;
}

.footer-top h2 {
    margin: 18px 0 0;
    font-size: clamp(3rem, 8vw, 8rem);
    line-height: .84;
    letter-spacing: -.07em;
}

.round-link {
    flex: 0 0 auto;
    width: clamp(74px, 10vw, 140px);
    height: clamp(74px, 10vw, 140px);
    display: grid;
    place-items: center;
    border-radius: 50%;
    background: var(--accent);
    color: #111116;
    font-size: clamp(1.8rem, 3vw, 3.3rem);
    transition: transform .25s ease;
}

.round-link:hover {
    transform: rotate(9deg) scale(1.03);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    gap: 30px;
    padding-top: 60px;
    margin-top: 60px;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: .76rem;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 16px 24px;
}

.footer-links a:hover {
    color: var(--accent);
}

@media (max-width: 700px) {
    .brand-copy {
        display: none;
    }

    .page-hero {
        grid-template-columns: 1fr;
    }

    .page-number {
        padding-top: 0;
    }

    .footer-top,
    .footer-bottom {
        align-items: flex-start;
        flex-direction: column;
    }

    .main-nav {
        padding-top: 95px;
    }

    .nav-item {
        grid-template-columns: 42px 1fr auto;
    }
}


/* --- Hierarchische Hauptnavigation --- */

.nav-group {
    border-top: 1px solid var(--border);
}

.nav-group:last-of-type {
    border-bottom: 1px solid var(--border);
}

.nav-group > .nav-item {
    width: 100%;
    border: 0;
}

.nav-group-toggle {
    appearance: none;
    background: transparent;
    color: inherit;
    text-align: left;
    cursor: pointer;
}

.nav-plus {
    position: relative;
    width: 22px;
    height: 22px;
    justify-self: end;
}

.nav-plus::before,
.nav-plus::after {
    content: "";
    position: absolute;
    left: 50%;
    top: 50%;
    width: 18px;
    height: 1px;
    background: currentColor;
    transform: translate(-50%, -50%);
    transition: transform .25s ease, opacity .25s ease;
}

.nav-plus::after {
    transform: translate(-50%, -50%) rotate(90deg);
}

.nav-group-toggle[aria-expanded="true"] .nav-plus::after {
    transform: translate(-50%, -50%) rotate(0deg);
    opacity: 0;
}

.nav-group.is-active > .nav-group-toggle,
.nav-group.is-open > .nav-group-toggle {
    color: var(--accent);
}

.nav-submenu {
    display: grid;
    grid-template-rows: 0fr;
    opacity: 0;
    transition:
        grid-template-rows .35s cubic-bezier(.76,0,.24,1),
        opacity .25s ease;
}

.nav-submenu.is-open {
    grid-template-rows: 1fr;
    opacity: 1;
}

.nav-submenu-inner {
    min-height: 0;
    overflow: hidden;
    padding-left: 55px;
}

.nav-subitem {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 20px;
    align-items: center;
    padding: 16px 0;
    border-top: 1px solid rgba(255,255,255,.08);
    color: var(--text-muted);
    font-size: clamp(1rem, 1.8vw, 1.4rem);
    font-weight: 650;
    transition: color .2s ease, padding-left .2s ease;
}

.nav-subitem:hover,
.nav-subitem.is-active {
    color: var(--accent);
    padding-left: 8px;
}

.nav-subitem:last-child {
    padding-bottom: 22px;
}

@media (max-width: 700px) {
    .nav-submenu-inner {
        padding-left: 42px;
    }

    .nav-subitem {
        font-size: 1rem;
        padding-top: 13px;
        padding-bottom: 13px;
    }
}


/* =========================================================
   GLOBALER DESKTOP-CANVAS
   Öffentliche Seiten mit dem globalen Header werden auf
   breiten Monitoren bewusst schmaler und mittig dargestellt.
   ========================================================= */
@media (min-width: 1100px) {
    body > .site-header,
    body > .site-header ~ main,
    body > .site-footer {
        width: min(100%, var(--site-desktop-width, 1280px)) !important;
        max-width: var(--site-desktop-width, 1280px) !important;
        margin-left: auto !important;
        margin-right: auto !important;
    }

    body > .site-header,
    body > .site-header ~ main {
        border-left: 1px solid var(--border);
        border-right: 1px solid var(--border);
    }

    body > .site-header {
        left: auto;
        right: auto;
    }

    /* Das Vollbild-Menü bleibt trotzdem bildschirmfüllend. */
    .main-nav {
        width: 100vw !important;
        max-width: none !important;
        margin: 0 !important;
    }

    .main-nav-inner {
        max-width: var(--container, 1180px);
    }
}