/* =====================================================================
       SITE SHELL – gemeinsamer Header, Hamburger-Menü, Off-Canvas-Nav
       ===================================================================== */

    :root {
        --shell-header-h: 56px;
        --shell-nav-w: 300px;
        --shell-header-bg: rgba(255, 255, 255, 0.97);
        --shell-border: rgba(148, 163, 184, 0.18);
        --shell-shadow: 0 1px 20px rgba(15, 23, 42, 0.06);
    }

    /* ---- Site Header ---- */
    .site-header {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        height: var(--shell-header-h);
        background: var(--shell-header-bg);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        border-bottom: 1px solid var(--shell-border);
        box-shadow: var(--shell-shadow);
        display: flex;
        align-items: center;
        gap: 12px;
        padding: 0 20px;
        z-index: 60;
    }

    .site-header-brand {
        font-weight: 800;
        font-size: 1.05rem;
        color: var(--slate-800);
        text-decoration: none;
        letter-spacing: -0.01em;
        white-space: nowrap;
    }

    .site-header-brand:hover {
        color: var(--primary);
    }

    .site-header-sep {
        color: var(--slate-300);
        font-size: 1.1rem;
        user-select: none;
    }

    .site-header-page {
        font-size: 0.9rem;
        font-weight: 600;
        color: var(--slate-500);
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    @media (display-mode: fullscreen) {
        body[data-view="presentation"] .site-header {
            display: none !important;
            position: static !important;
            height: 0 !important;
            border-bottom: none !important;
            box-shadow: none !important;
            background: transparent !important;
            backdrop-filter: none !important;
            -webkit-backdrop-filter: none !important;
        }

        body[data-view="presentation"] .presentation-view {
            padding-top: 10px !important;
        }
    }

    /* ---- Hamburger Button ---- */
    .site-hamburger {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        width: 40px;
        height: 40px;
        padding: 0;
        border: none;
        background: transparent;
        border-radius: 10px;
        cursor: pointer;
        flex-shrink: 0;
        transition: background 0.15s ease;
        box-sizing: border-box;
        line-height: 0;
    }

    .site-hamburger:hover {
        background: var(--slate-100);
    }

    .site-hamburger svg {
        display: block;
        width: 22px;
        height: 22px;
        flex-shrink: 0;
    }

    .site-hamburger line {
        stroke: var(--slate-800);
        stroke-width: 2.4;
        stroke-linecap: round;
        vector-effect: non-scaling-stroke;
        shape-rendering: geometricPrecision;
    }

    /* ---- Off-Canvas Overlay ---- */
    .site-nav-overlay {
        position: fixed;
        inset: 0;
        background: rgba(15, 23, 42, 0.32);
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.22s ease;
        z-index: 90;
    }

    .site-nav-overlay.is-open {
        opacity: 1;
        pointer-events: auto;
    }

    /* ---- Off-Canvas Nav Drawer ---- */
    .site-nav-drawer {
        position: fixed;
        top: 0;
        left: 0;
        width: var(--shell-nav-w);
        height: 100vh;
        background: #ffffff;
        border-right: 1px solid var(--shell-border);
        box-shadow: 24px 0 60px rgba(15, 23, 42, 0.14);
        transform: translateX(-100%);
        transition: transform 0.24s cubic-bezier(0.4, 0, 0.2, 1);
        z-index: 100;
        display: flex;
        flex-direction: column;
        overflow-y: auto;
    }

    .site-nav-drawer.is-open {
        transform: translateX(0);
    }

    .site-nav-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 18px 18px 14px;
        border-bottom: 1px solid var(--shell-border);
        flex-shrink: 0;
    }

    .site-nav-title {
        font-size: 1.1rem;
        font-weight: 800;
        color: var(--slate-800);
    }

    .site-nav-close {
        border: none;
        background: transparent;
        cursor: pointer;
        font-size: 1rem;
        color: var(--slate-500);
        width: 32px;
        height: 32px;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: 8px;
        transition: background 0.15s ease;
        flex-shrink: 0;
    }

    .site-nav-close:hover {
        background: var(--slate-100);
    }

    .site-nav-list {
        padding: 10px;
        display: flex;
        flex-direction: column;
        gap: 2px;
    }

    .site-nav-item {
        display: flex;
        align-items: center;
        gap: 12px;
        padding: 10px 12px;
        border-radius: 12px;
        text-decoration: none;
        color: var(--slate-800);
        transition: background 0.15s ease;
        outline-offset: 2px;
    }

    .site-nav-item:hover {
        background: var(--slate-100);
    }

    .site-nav-item.is-active {
        background: rgba(0, 128, 0, 0.08);
        color: var(--primary);
    }

    .site-nav-item-icon {
        font-size: 1.35rem;
        width: 30px;
        text-align: center;
        flex-shrink: 0;
    }

    .site-nav-item-text {
        display: flex;
        flex-direction: column;
        gap: 1px;
        min-width: 0;
    }

    .site-nav-item-text strong {
        font-size: 0.92rem;
        font-weight: 700;
        line-height: 1.2;
    }

    .site-nav-item-text span {
        font-size: 0.76rem;
        color: var(--slate-500);
        line-height: 1.3;
    }

    .site-nav-item.is-active .site-nav-item-text span {
        color: inherit;
        opacity: 0.75;
    }

    /* ---- Footer / Impressum ---- */
    .site-footer {
        margin-top: 0px;
        padding: 20px;
        background: #ffffff;
        color: var(--slate-700);
    }

    .site-footer__inner {
        max-width: 1180px;
        margin: 0 auto;
        height: 20px;
        text-align: center;
    }

    .site-footer__toggle {
        appearance: none;
        border: none;
        background: transparent;
        padding: 0 0 12px;
        font: inherit;
        font-size: 0.9rem;
        font-weight: 800;
        letter-spacing: 0.08em;
        text-transform: uppercase;
        color: var(--slate-500);
        cursor: pointer;
        text-align: center;
    }

    .site-footer__toggle:hover,
    .site-footer__toggle:focus-visible {
        color: var(--primary);
        outline: none;
    }

    .site-footer__content {
        display: none;
    }

    .site-footer.is-open .site-footer__content {
        display: block;
    }

    .site-footer__grid {
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
        gap: 18px 28px;
        font-size: 0.92rem;
        line-height: 1.6;
        padding-top: 8px;
        text-align: left;
    }

    body:has(.presentation-view.dark-mode) .site-footer {
        background: #000000;
        border-top-color: #000000;
        color: #475569;
    }

    body:has(.presentation-view.dark-mode) .site-footer__inner {
        border-top: 1px solid #000000;
    }

    body:has(.presentation-view.dark-mode) .site-footer__toggle {
        color: #9ca3af;
    }

    body:has(.presentation-view.dark-mode) .site-footer__toggle:hover,
    body:has(.presentation-view.dark-mode) .site-footer__toggle:focus-visible {
        color: #9ca3af;
    }

    body:has(.presentation-view.dark-mode) .site-footer__grid,
    body:has(.presentation-view.dark-mode) .site-footer__grid strong,
    body:has(.presentation-view.dark-mode) .site-footer__grid a {
        color: #475569;
    }

    .site-footer a {
        color: var(--primary);
        text-decoration: none;
    }

    .site-footer a:hover {
        text-decoration: underline;
    }

    /* ---- Generator-Toolbar: Hamburger neben Aufgabenauswahl ---- */
    .toolbar-hamburger {
        flex-shrink: 0;
    }

    /* ---- Generator-Home-Topbar ---- */
    .generator-home-topbar {
        max-width: 1180px;
        margin: 0 auto 8px;
        display: flex;
        align-items: center;
        gap: 10px;
    }

    .generator-home-back-link {
        font-size: 0.88rem;
        font-weight: 600;
        color: var(--slate-500);
        text-decoration: none;
        transition: color 0.15s ease;
    }

    .generator-home-back-link:hover {
        color: var(--primary);
    }




    @media (max-width: 640px) {
        .site-header {
            padding: 0 14px;
        }

        .site-header-page {
            display: none;
        }
    }