:root {
    --nav-bg: rgba(255, 255, 255, 0.32);
    --nav-bg-shrink: rgba(255, 255, 255, 0.99);
    --nav-border: rgba(0, 0, 0, 0.06);
    --nav-text: #0f1115;
    --nav-link: #0f1115;
    --nav-link-muted: rgba(15, 17, 21, 0.72);
    --nav-brand: var(--brand);
}

body.nav-open {
    overflow: hidden;
}

/* ==========================================
   BASIS-STYLES (Allgemeines Layout & Optik)
   ========================================== */
header.nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 50;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 22px;
    transition: padding 0.28s ease, background 0.28s ease, box-shadow 0.28s ease;
}

header.nav.shrink {
    padding: 5px 22px;
    background: var(--nav-bg-shrink);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

header.nav .logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-weight: 700;
    letter-spacing: 0.2px;
}

header.nav .logo img {
    display: block;
    height: 40px;
    width: auto;
}

header.nav .logo__dot {
    width: 10px; height: 10px;
    border-radius: 999px;
    background: var(--nav-brand);
}

header.nav nav a {
    display: inline-flex;
    align-items: center;
    padding: 0.55rem 0.7rem;
    margin-left: 0.25rem;
    text-decoration: none;
    font-weight: 600;
    color: var(--nav-link-muted);
    border-radius: 10px;
    transition: color 0.2s ease, background-color 0.2s ease;
}

header.nav nav a:hover,
header.nav nav a:not([aria-current='page']):hover {
    color: var(--nav-link);
    background: rgba(190, 190, 190, 0.55);
}

header.nav nav a[href='#kapitel-0'][aria-current='page'] {
    background: transparent;
    color: var(--nav-link-muted);
}

/* CTA Button */
header.nav .cta {
    margin-left: 0.4rem;
    background: var(--brand2);
    color: #fff;
    padding: 0.6rem 0.9rem;
    border-radius: 12px;
    border: none;
    box-shadow: 0 6px 18px rgba(125, 95, 255, 0.25);
    font-weight: 600;
    text-decoration: none;
}

/* Externer Link Icon */
header.nav nav a.nav-external {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    border: 1.5px solid transparent;
    transition: all 0.2s ease-in-out;
}

header.nav nav a.nav-external:hover {
    border-color: var(--brand2);
    color: var(--nav-link);
    background: rgba(190, 190, 190, 0.55);
}

.external-link-icon {
    width: 15px; height: 15px;
    opacity: 0.7;
    transition: opacity 0.3s ease-in-out;
}

header.nav nav a.nav-external:hover .external-link-icon {
    opacity: 1;
}

/* Burger Menu Button (Grundstruktur, sichtbar in Mobile) */
.menu-toggle-btn {
    display: none;
    position: fixed;
    top: 14px; right: 22px;
    z-index: 101;
    background: transparent;
    border: none;
    cursor: pointer;
    width: 32px; height: 32px;
    padding: 0;
}

.menu-toggle-btn .icon-open,
.menu-toggle-btn .icon-close {
    position: absolute;
    inset: 0;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.menu-toggle-btn .icon-close { opacity: 0; transform: scale(0.8); }
.menu-toggle-btn svg path { stroke: var(--fg); }
.nav-open .menu-toggle-btn .icon-open { opacity: 0; transform: scale(0.8); }
.nav-open .menu-toggle-btn .icon-close { opacity: 1; transform: scale(1); }

/* Submenu Basis Styles */
header.nav .submenu {
    position: absolute;
    background: #fff;
    border: 1px solid var(--nav-border);
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, .10);
    z-index: 1000;
}

/* HIER FEHLTE DIE KLASSE FÜRS AUFKLAPPEN! */
header.nav .submenu.submenu--open {
    display: block !important;
}

header.nav .submenu .menu-group {
    list-style: none;
    margin: 0;
    padding: 4px;
}

header.nav .submenu a {
    display: block;
    padding: .5rem .65rem;
    border-radius: 8px;
    color: var(--fg);
}

header.nav .submenu a:hover {
    background: rgba(0, 0, 0, .06);
}

header.nav .menu-label {
    font-size: .78rem;
    letter-spacing: .04em;
    text-transform: uppercase;
    opacity: .65;
    padding: .2rem .65rem .35rem;
}

header.nav .menu-sep {
    height: 1px; border: 0;
    background: var(--nav-border);
    opacity: .6; margin: 6px 4px;
}

header.nav .submenu .menu-category {
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--nav-link);
    opacity: 0.8;
    padding: 0.5rem 0.65rem 0.2rem 1.1rem; 
    display: block;
}

header.nav .submenu .menu-category:not(:first-of-type) {
    margin-top: 1.2rem; /* Etwas mehr Luft als Trenner */
    padding-top: 0;     /* Kein Padding mehr nötig */
    border-top: none;   /* Strich entfernt! */
}

header.nav .submenu li.menu-category.first-category {
    padding-top: 0 !important;
    margin-top: 10px !important; 
}

header.nav .submenu .menu-group--location [role="menuitem"] a {
    padding-top: 0.25rem;
    padding-bottom: 0.25rem;
    font-size: 0.95rem;
    padding-left: 1.7rem; 
}


/* ==========================================
   DESKTOP (ab 992px)
   ========================================== */
@media (min-width: 992px) {
    header.nav nav {
        display: flex;
        align-items: center;
        gap: .25rem;
        flex-wrap: nowrap;
    }

    header.nav nav .has-sub {
        display: inline-flex;
        align-items: center;
        position: relative;
    }

    /* Hover Brücke */
    header.nav .has-sub:hover::after,
    header.nav .has-sub:focus-within::after {
        content: ""; position: absolute; left: 0; right: 0; top: 100%; height: 25px;
    }

    header.nav .menu-parent {
        display: inline-flex; align-items: center; gap: .4rem;
        padding: .55rem .7rem; border: 0; background: transparent; cursor: pointer;
        color: var(--nav-link); opacity: 0.72; border-radius: 10px;
        font-weight: 600; font-family: inherit; font-size: inherit; margin-left: 0.25rem;
    }

    header.nav .menu-parent:hover {
        opacity: 1; background: rgba(190, 190, 190, 0.55);
    }

  /* Submenu Layout Desktop (3 Spalten) */
    header.nav .submenu {
        display: flex; flex-direction: row; align-items: flex-start;
        top: calc(100% + 25px); left: auto; right: 0;
        width: 780px; min-width: 780px; padding: 15px; gap: 0;
        opacity: 0; transform: translateY(-6px);
        transition: opacity .18s ease, transform .18s ease;
        pointer-events: none;
    }

  /* 1. Spalte: Branchenlösungen (Ganz links) */
    header.nav .submenu > .menu-group--branches {
        order: 1; width: 250px; flex: none; 
        padding: 4px 10px 4px 4px;
        border-right: 1px solid rgba(0, 0, 0, 0.05); margin: 0;
    }

    /* 2. Spalte: Regionale Leistungen (Mitte) */
    header.nav .submenu > .menu-group--location {
        order: 2; width: 250px; flex: none; 
        padding: 4px 10px;
        border-right: 1px solid rgba(0, 0, 0, 0.05); margin: 0;
    }

    /* 3. Spalte: Allgemeine Leistungen (Rechts) */
    header.nav .submenu > .menu-group--services {
        order: 3; width: 250px; flex: none; 
        padding: 4px 4px 4px 10px; 
        border-right: none; margin: 0;
    }

    header.nav .submenu .menu-sep { display: none; }

    /* DAS HIER WIEDER EINFÜGEN */
    header.nav .has-sub:hover > .submenu,
    header.nav .has-sub:focus-within > .submenu,
    header.nav .submenu:hover {
        opacity: 1; 
        transform: translateY(0); 
        pointer-events: auto;
    }

  /* Caret Pfeil - Grundzustand (bestimmt das VERSCHWINDEN) */
header.nav .has-sub::before {
    content: ""; position: absolute; left: 50%; top: calc(100% + 19px);
    width: 12px; height: 12px; transform: translateX(-50%) rotate(45deg);
    background: #fff; box-shadow: -1px -1px 0 0 var(--nav-border);
    z-index: 1001; opacity: 0; 
    
    /* HIER ÄNDERN: Extrem schnelles Ausblenden beim Wegziehen der Maus */
    transition: opacity 0.05s ease, transform 0.1s ease;
}

/* Caret Pfeil - Hover-Zustand (bestimmt das ERSCHEINEN) */
header.nav .has-sub:hover::before,
header.nav .has-sub:focus-within::before {
    opacity: 1; 
    transform: translateX(-50%) translateY(0) rotate(45deg);
    
    /* HIER ÄNDERN: 0.04s Verzögerung ganz am Ende hinzugefügt */
    transition: opacity 0.18s ease 0.04s, transform 0.18s ease 0.04s;
}
}


/* ==========================================
   MOBILE & TABLET (bis 991px)
   ========================================== */
@media (max-width: 991px) {
    header.nav nav {
        position: fixed; top: 0; left: 0;
        width: 100vw; height: 100vh;
        background: rgba(248, 249, 250, 0.9);
        -webkit-backdrop-filter: blur(18px); /* Wichtig für iOS! */
        backdrop-filter: blur(18px);
        display: flex; flex-direction: column; justify-content: flex-start;
        overflow-y: auto;
        padding: 12vh 2rem 5rem 2rem; gap: 0.5rem;
        transform: translateX(-100%);
        transition: transform 0.4s cubic-bezier(0.23, 1, 0.32, 1);
        z-index: 100; opacity: 0; pointer-events: none;
    }

    header.nav nav.is-open {
        transform: translateX(0); opacity: 1; pointer-events: auto;
    }

    header.nav nav a {
        display: block; width: 100%; text-align: center;
        font-size: 1rem; color: #222222ff;
        padding: 0.75rem 1rem; border-radius: 10px;
        opacity: 0; transform: translateY(15px);
        transition: opacity 0.3s ease, transform 0.3s ease;
    }

    header.nav nav a:hover { background: rgba(255, 255, 255, 0.1); color: #fff; }
    header.nav nav a[aria-current='page'] { background: rgba(255, 255, 255, 0.36) !important; }
    
    header.nav nav a.cta {
        color: #fff; margin-top: 1rem; background: var(--brand2);
        width: auto; align-self: center; padding-left: 3rem; padding-right: 3rem;
    }
    
    header.nav nav a.cta:hover { opacity: 0.9; }
    header.nav nav a.cta[aria-current='page'] { box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.4); }
    header.nav nav a.nav-external { justify-content: center; }

    header.nav .has-sub {
        display: block; width: 100%; position: relative;
    }

    header.nav .menu-parent {
        display: flex; justify-content: center; align-items: center; width: 100%;
        font-size: 1rem; color: #222222ff; background: transparent;
        padding: 0.75rem 1rem; border-radius: 10px; margin: 0; border: none;
        font-weight: 600; 
    font-family: inherit;
    }
    
    header.nav .menu-parent:hover { background: rgba(255, 255, 255, 0.1); color: #1e1e1e; }

    /* Fade-in Animation Staggering */
    header.nav nav.is-open .has-sub,
    header.nav nav.is-open .menu-parent,
    header.nav nav.is-open a {
        opacity: 1; transform: translateY(0);
    }
    header.nav nav.is-open a:nth-child(1) { transition-delay: 0.1s; }
    header.nav nav.is-open .has-sub { transition-delay: 0.13s; }
    header.nav nav.is-open a:nth-child(3) { transition-delay: 0.16s; }
    header.nav nav.is-open a:nth-child(4) { transition-delay: 0.19s; }
    header.nav nav.is-open a:nth-child(5) { transition-delay: 0.22s; }
    header.nav nav.is-open a:nth-child(6) { transition-delay: 0.25s; }
    header.nav nav.is-open a:nth-child(7) { transition-delay: 0.28s; }
    header.nav nav.is-open a:nth-child(8) { transition-delay: 0.31s; }

    .menu-toggle-btn { display: block; top: 23px; right: 22px; }
    .nav-open .menu-toggle-btn svg path { stroke: #313131ff; }
    header.nav .logo img { height: 34px; }
    header.nav.shrink { padding-top: 18px; padding-bottom: 18px; }

    /* Mobile Submenu (Einspaltig) */
    header.nav .submenu {
        position: static; width: 100%; max-width: none;
        padding: 0.5rem 0; margin: 0.25rem 0 1rem 0; border: 0;
        border-radius: 10px; box-shadow: none; background: rgba(0, 0, 0, 0.04);
        opacity: 1; transform: none; pointer-events: auto; display: none;
        max-height: none; overflow: hidden;
    }

    header.nav .submenu a { font-size: 0.9rem; padding: 0.4rem 0.65rem; font-weight: 400; }
    
/* --- START: Mobiles Akkordeon-Menü --- */
/* 1. Hintergründe der Gruppen transparent machen */
header.nav .submenu .menu-group {
    background: transparent !important; 
    padding: 0 !important;
    margin-bottom: 0.5rem;
}

/* 2. Alle Unterpunkte (Links/Kategorien) initial verstecken */
header.nav .submenu .menu-group > li:not(.menu-label) {
    display: none;
}

/* 3. Unterpunkte anzeigen, wenn die Gruppe offen ist */
header.nav .submenu .menu-group.is-open > li:not(.menu-label) {
    display: block !important;
}

/* 4. Die Überschriften (Labels) als klickbare Buttons stylen */
header.nav .submenu .menu-label {
    cursor: pointer;
    display: flex;
    justify-content: center; /* Zentriert den Inhalt (Text + Pfeil) */
    align-items: center;
    gap: 0.4rem; /* Zieht den Pfeil direkt an das Wort heran */
    padding: 0.75rem 1rem;
    background: transparent; /* Entfernt den grauen Balken */
    color: #222222ff; /* Gleiche Farbe wie die Hauptpunkte */
    font-weight: 600;
    font-size: 1rem; /* Gleiche Größe wie die Hauptpunkte */
    text-transform: none;
    pointer-events: auto; 
}

/* 5. Kleiner Pfeil nach unten für die Labels */
header.nav .submenu .menu-label::after {
    content: "";
    display: block;
    width: 8px;
    height: 8px;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: translateY(-2px) rotate(45deg);
    transition: transform 0.3s ease;
}

/* 6. Pfeil drehen, wenn Akkordeon offen ist */
header.nav .submenu .menu-group.is-open .menu-label::after {
    transform: translateY(2px) rotate(225deg);
}
/* --- ENDE: Mobiles Akkordeon-Menü --- */

   /* SICHERHEITS-NETZ FÜR MOBILE AUFKLAPPEN (als Flexbox zum Sortieren) */
    header.nav .has-sub.open > .submenu { 
        display: flex !important; 
        flex-direction: column;
        margin-bottom: clamp(12px, 1.8vh, 20px); 
    }

    /* Mobile Sortierung der Leistungen */
    header.nav .submenu .menu-group--services { order: 1; }
    header.nav .submenu .menu-group--branches { order: 2; }
    header.nav .submenu .menu-group--location { order: 3; }

    /* Trennlinien auf Mobile verstecken, da sie beim Umordnen im Weg sind */
    header.nav .submenu .menu-sep { display: none; }
    
    header.nav .has-sub.open + a { margin-top: 15px; }
    
    header.nav .submenu::before,
    header.nav .submenu::after,
    header.nav .has-sub::before { display: none; }

    header.nav .submenu .menu-label,
    header.nav .submenu .menu-category {
        text-align: center; padding-left: 0; text-transform: none; font-size: 0.9rem;
    }
    
    header.nav .submenu .menu-group--location [role="menuitem"] a {
        padding-left: 0.65rem; text-align: center;
    }
}