/* Inhaltsverzeichnis
   4. HEADER & NAVIGATION
      4.1 Basis-Konfiguration
      4.2 Dynamischer Kontrast & Glass-Effekte
      4.3 Navigation Links & Underline (Adaptive)
      4.4 Mega-Menü (Desktop)
      4.5 Mobile Navigation (Overlay & Akkordeon)
*/

/* ==============================
   4.1 Basis-Konfiguration
   ============================== */
:root {
    --header-height: 80px;
    --nav-item-spacing: 2.5rem;
    --glass-bg: rgba(8, 27, 78, 0.9);
    --glass-border: rgba(255, 255, 255, 0.1);
    --transition-header: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --underline-color: var(--color-primary);
}

body.is-index,
body.scrolled {
    --underline-color: var(--color-accent);
    /* Dynamisch Hell */
}

header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--header-height);
    display: flex;
    align-items: center;
    transition: var(--transition-header);
    background: transparent;
}

.visually-hidden-focusable:not(:focus):not(:active) {
    clip: rect(0 0 0 0);
    clip-path: inset(50%);
    height: 1px;
    overflow: hidden;
    position: absolute;
    white-space: nowrap;
    width: 1px;
}

/* ==============================
   4.2 Dynamischer Kontrast & Glass-Effekte
   ============================== */
.backdrop {
    position: absolute;
    inset: 0;
    z-index: -1;
    transition: var(--transition-header);
}

body.scrolled header .backdrop {
    background: var(--glass-bg);
    backdrop-filter: blur(15px) saturate(1.2);
    -webkit-backdrop-filter: blur(15px) saturate(1.2);
}

.backdrop-edge {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 1px;
    background: var(--glass-border);
    opacity: 0;
    transition: opacity 0.3s;
}

body.scrolled .backdrop-edge {
    opacity: 1;
}

.navbar {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
}

.logo img {
    height: 42px;
    transition: transform 0.3s;
}

/* ==============================
   4.3 Desktop Navigation Links
   ============================== */
/* Standardmäßig anzeigen (wird in Mobile Query versteckt) */
.nav-links {
    display: flex;
    gap: var(--nav-item-spacing);
    list-style: none;
    align-items: center;
    margin: 0;
    padding: 0;
}

.main-links {
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    padding: 0.5rem 0;
    position: relative;
    transition: color 0.3s;
    color: var(--color-primary);
}

body.is-index .main-links,
body.scrolled .main-links {
    color: var(--color-light);
}

.main-links::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--underline-color);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.main-links:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

/* ==============================
   4.4 Mega-Menü (Desktop)
   ============================== */
@media (min-width: 992px) {
    .burger {
        display: none !important;
    }

    /* Sicherstellen, dass Burger weg ist */
    .overlay {
        display: none !important;
    }

    /* Overlay auf Desktop niemals zeigen */

    .has-dropdown {
        position: relative;
        padding-bottom: 25px;
        margin-bottom: -25px;
    }

    .mega-menu {
        position: absolute;
        top: 100%;
        left: 50%;
        transform: translateX(-50%) translateY(15px);
        background: var(--color-light);
        min-width: 580px;
        padding: 35px;
        border-radius: 24px;
        box-shadow: 0 25px 60px rgba(0, 0, 0, 0.18);
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 30px;
        opacity: 0;
        visibility: hidden;
        transition: all 0.35s;
    }

    .mega-menu::before {
        content: '';
        position: absolute;
        top: -30px;
        inset: 0;
        height: 30px;
    }

    .has-dropdown:hover .mega-menu {
        opacity: 1;
        visibility: visible;
        transform: translateX(-50%) translateY(0);
    }

    .dropdown-title {
        font-weight: 800;
        color: var(--color-primary);
        font-size: 0.85rem;
        text-transform: uppercase;
        border-bottom: 2px solid var(--color-accent);
        padding-bottom: 6px;
        margin-bottom: 8px;
    }

    .dropdown-links {
        text-decoration: none;
        color: #444;
        padding: 10px 15px;
        border-radius: 12px;
        transition: 0.2s;
        background: #f9fbfd;
        display: block;
        margin-top: 32px;
    }

    .dropdown-links:hover {
        background: var(--color-accent);
        color: var(--color-primary);
        transform: translateX(5px);
    }
}

/* ==============================
   4.5 Mobile Navigation (Overlay & Akkordeon)
   ============================== */
@media (max-width: 991px) {

    /* Desktop-Elemente sauber verstecken */
    .nav-links {
        display: none !important;
    }

    /* Burger Button */
    .burger {
        display: flex;
        flex-direction: column;
        justify-content: center;
        border: none;
        background: transparent;
        cursor: pointer;
        padding: 5px;
        z-index: 100;
        /* Normaler Index, wird vom Overlay überlagert */
    }

    .burger span {
        display: block;
        width: 26px;
        height: 2px;
        margin: 4px 0;
        background: var(--color-primary);
        transition: 0.3s;
    }

    body.is-index .burger span,
    body.scrolled .burger span {
        background: var(--color-light);
    }

    /* Mobile Overlay Styles */
    .overlay {
        position: fixed;
        inset: 0;
        background: var(--color-primary);
        z-index: 1001;
        /* Liegt über ALLEM (auch über dem Burger) */
        display: flex;
        flex-direction: column;
        padding: 80px 30px 40px;
        opacity: 0;
        visibility: hidden;
        transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        overflow-y: auto;
    }

    .overlay.active {
        opacity: 1;
        visibility: visible;
    }

    .close-overlay {
        position: fixed;
        top: 25px;
        right: 25px;
        background: none;
        border: none;
        color: var(--color-light);
        font-size: 3rem;
        line-height: 1;
        cursor: pointer;
        z-index: 1002;
        transition: transform 0.3s;
    }

    .close-overlay:hover {
        transform: scale(1.1);
    }

    .mobile-nav-links {
        list-style: none;
        padding: 0;
        margin: 0;
    }

    .mobile-nav-links>li {
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .mobile-nav-links a {
        display: block;
        padding: 20px 0;
        color: var(--color-light);
        text-decoration: none;
        font-size: 1.4rem;
        font-weight: 600;
        transition: padding-left 0.3s ease, color 0.3s ease;
    }

    .mobile-nav-links a:hover,
    .mobile-dropdown-toggle:hover {
        color: var(--color-accent);
        padding-left: 10px;
    }

    /* Mobile Accordion */
    .mobile-dropdown-menu {
        list-style: none;
        padding: 0 0 0 20px;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.4s ease-out;
    }

    .has-dropdown.open .mobile-dropdown-menu {
        max-height: 500px;
        padding-bottom: 20px;
    }

    .mobile-dropdown-toggle {
        display: flex;
        justify-content: space-between;
        align-items: center;
    }

    .has-dropdown.open .mobile-dropdown-toggle .icon {
        transform: rotate(180deg);
    }

    .nested-category {
        color: var(--color-accent);
        font-size: 0.8rem;
        text-transform: uppercase;
        letter-spacing: 0.1em;
        margin: 15px 0 5px;
        font-weight: 800;
        opacity: 0.8;
    }

    .mobile-menu-footer {
        margin-top: auto;
        padding-top: 40px;
    }

    .mobile-call-btn {
        display: flex;
        align-items: center;
        justify-content: center;
        gap: 10px;
        background: var(--color-accent);
        color: var(--color-primary) !important;
        padding: 18px;
        border-radius: 12px;
        font-weight: 800;
    }

    .mobile-call-btn:hover {
        background: var(--color-light);
        padding-left: 0;
    }
}

/* Scroll Lock (wird per JS getriggert) */
body.no-scroll {
    overflow: hidden;
}