/**
 * RTC Computer GmbH - Navigation v2
 * Full-width mega menu inspired by coder.com
 *
 * Features:
 * - Fixed header with hide/show on scroll
 * - Full-width dropdown spanning entire browser
 * - Feature Cards with icons and descriptions
 * - Link columns with category titles
 * - Smooth hover transitions
 * - Mobile full-screen overlay menu
 */

/* ============================================
   CSS CUSTOM PROPERTIES
   ============================================ */
:root {
    --nav-height: 160px;
    --nav-height-mobile: 64px;
    --nav-height-scrolled: 66px;
    --nav-bg: rgba(255, 255, 255, 0.92);
    --nav-bg-scrolled: rgba(255, 255, 255, 0.95);
    --nav-text: #1a1a1a;
    --nav-text-secondary: #666666;
    --nav-text-hover: #2c2c2c;
    --nav-indicator: #2c2c2c;
    --nav-indicator-accent: #3d3d3d;
    --nav-border: #e5e5e5;
    --nav-shadow: rgba(0, 0, 0, 0.05) 0px 1px 0px, rgba(0, 0, 0, 0.08) 0px 4px 20px;
    --nav-transition: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --dropdown-bg: #ffffff;
    --dropdown-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --feature-card-bg: #f8f9fa;
    --feature-card-hover: #f0f1f3;
}

/* ============================================
   HEADER / NAV BASE
   ============================================ */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 2600;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.5rem 5%;
    transition:
        padding var(--nav-transition),
        box-shadow var(--nav-transition),
        top var(--nav-transition);
    border-bottom: 1px solid var(--nav-border);
    /* Override style.css - prevent containing block for fixed dropdowns */
    background: transparent !important;
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;
    transform: none !important;
}

/* Nav background with blur - using ::before to avoid containing block issues */
nav::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--nav-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: -1;
    transition: background-color var(--nav-transition);
}

/* Scrolled state - compact header */
nav.scrolled {
    padding: 0.5rem 5%;
    box-shadow: var(--nav-shadow);
}

nav.scrolled::before {
    background: var(--nav-bg-scrolled);
}

/* Hidden on scroll down - use top instead of transform to avoid containing block */
nav.nav-hidden {
    top: -200px;
    pointer-events: none;
}

/* Visible on scroll up */
nav.nav-visible {
    top: 0;
}

/* ============================================
   LOGO
   ============================================ */
nav .logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    flex-shrink: 0;
    z-index: 10;
}

nav .logo-image {
    height: 140px;
    width: auto;
    object-fit: contain;
    transition: height var(--nav-transition);
}

nav.scrolled .logo-image {
    height: 50px;
}

/* ============================================
   NAVIGATION LINKS CONTAINER
   ============================================ */
nav .nav-links {
    display: flex;
    align-items: center;
    gap: 0;
    list-style: none;
    margin: 0;
    padding: 0;
    height: 100%;
}

nav .nav-links > li {
    position: relative;
    height: 100%;
    display: flex;
    align-items: center;
}

/* ============================================
   NAVIGATION LINK STYLING
   ============================================ */
nav .nav-links > li > a {
    position: relative;
    display: flex;
    align-items: center;
    padding: 8px 16px;
    font-size: 15px;
    font-weight: 500;
    color: var(--nav-text);
    text-decoration: none;
    transition: color 0.2s ease;
    white-space: nowrap;
    height: 100%;
}

nav .nav-links > li > a:hover {
    color: var(--nav-text-hover);
}

/* Hover Indicator Dot */
nav .nav-links > li > a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 3px;
    background: var(--nav-indicator);
    border-radius: 3px 3px 0 0;
    transform: translateX(-50%);
    transition: width 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

nav .nav-links > li > a:hover::after,
nav .nav-links > li.active > a::after,
nav .nav-links > li.has-dropdown:hover > a::after,
nav .nav-links > li.has-dropdown.dropdown-open > a::after {
    width: 6px;
}

/* ============================================
   ICON LINKS (Fernwartung, WhatsApp)
   ============================================ */
nav .nav-links > li > a[download],
nav .nav-links > li > a[target="_blank"] {
    padding: 8px 12px;
}

nav .nav-links > li > a[download]::after,
nav .nav-links > li > a[target="_blank"]::after {
    display: none;
}

nav .nav-links > li > a svg {
    width: 22px;
    height: 22px;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

nav .nav-links > li > a:hover svg {
    transform: scale(1.1);
    opacity: 0.7;
}

/* ============================================
   FULL-WIDTH DROPDOWN / MEGA MENU
   Header expands downward effect
   ============================================ */
nav .dropdown-menu {
    position: fixed;
    /* Initial: Logo 140px + padding 48px (1.5rem*2) = ~188px, use calc */
    top: calc(140px + 3rem);
    left: 0 !important;
    right: 0 !important;
    width: 100vw !important;
    max-width: 100vw !important;
    margin-left: 0;
    background: #ffffff;
    border-bottom: 1px solid var(--nav-border);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    /* Override navigation-dropdown.css transform */
    transform: translateY(-20px) translateX(0) !important;
    transition:
        opacity 0.3s ease,
        transform 0.3s ease,
        visibility 0.3s,
        top var(--nav-transition);
    z-index: 2500;
}

/* Blur overlay for page content when dropdown is open */
.dropdown-blur-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.3s ease, visibility 0.3s;
    z-index: 2400;
}

.dropdown-blur-overlay.active {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    cursor: pointer;
}

/* Scrolled state adjusts dropdown position */
nav.scrolled .dropdown-menu {
    /* Scrolled: Logo 50px + padding 16px (0.5rem*2) = ~66px */
    top: calc(50px + 1rem);
}

/* Hover bridge for smooth mouse transition */
nav .has-dropdown::before {
    content: '';
    position: absolute;
    top: 100%;
    left: -20px;
    right: -20px;
    height: 20px;
    background: transparent;
}

/* Dropdown visible when JS adds .dropdown-open class */
nav .has-dropdown.dropdown-open .dropdown-menu {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0) translateX(0) !important;
}

/* ============================================
   DROPDOWN CONTENT LAYOUT - FULL WIDTH EDGE-TO-EDGE
   ============================================ */
nav .dropdown-content {
    width: 100%;
    max-width: 100%;
    margin: 0;
    padding: 40px 5%;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px 40px;
}

/* For Produkte - 2 Feature Cards + 3 Link Columns = 5 columns */
nav .dropdown-menu.extra-wide .dropdown-content {
    grid-template-columns: repeat(5, 1fr);
}

/* For Leistungen - 2 Feature Cards + 2 Link Columns = 4 columns */
nav .dropdown-menu.full-width .dropdown-content {
    grid-template-columns: repeat(4, 1fr);
}

/* For Narrow dropdowns (Unternehmen) - 2 columns (1 link column + 1 feature card) */
nav .dropdown-menu.narrow .dropdown-content {
    grid-template-columns: repeat(2, 1fr);
}

/* Each grid item gets padding and separator border */
nav .dropdown-content > * {
    padding: 0 32px;
    border-right: 1px solid var(--nav-border);
}

/* First element - no left padding needed (container has padding) */
nav .dropdown-content > *:first-child {
    padding-left: 0;
}

/* Last element gets extra right padding and no border */
nav .dropdown-content > *:last-child {
    border-right: none;
    padding-right: clamp(48px, 5vw, 80px);
}

/* ============================================
   FEATURE CARDS - Coder.com Style
   ============================================ */
nav .dropdown-features {
    display: contents;
}

nav .feature-card {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 0;
    padding: 0;
    background: transparent;
    border-radius: 0;
    text-decoration: none;
    transition: opacity 0.2s ease;
    overflow: visible;
}

nav .feature-card:hover {
    opacity: 0.85;
}

nav .feature-card-content {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 24px;
}

nav .feature-card-icon {
    display: none;
}

nav .feature-card-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--nav-text);
    line-height: 1.3;
    margin: 0;
}

nav .feature-card-description {
    font-size: 14px;
    color: var(--nav-text-secondary);
    line-height: 1.6;
    margin: 0;
}

nav .feature-card-image {
    width: calc(100% - 24px);
    height: 140px;
    min-height: 140px;
    max-height: 140px;
    background-size: cover;
    background-position: center;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

nav .feature-card:hover .feature-card-image {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.18);
}

/* ============================================
   LINK COLUMNS - Coder.com Style
   ============================================ */
nav .dropdown-links {
    display: contents;
}

nav .link-column {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

nav .link-column-title {
    font-size: 11px;
    font-weight: 500;
    color: var(--nav-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 20px;
}

nav .link-column a {
    position: relative;
    display: block;
    padding: 8px 0 8px 12px;
    font-size: 15px;
    font-weight: 400;
    color: var(--nav-text);
    text-decoration: none;
    transition: color 0.15s ease;
}

/* Hover Indicator Rectangle - slides in from left */
nav .link-column a::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%) scaleX(0);
    transform-origin: left center;
    width: 3px;
    height: 50%;
    background: var(--nav-indicator);
    border-radius: 0 2px 2px 0;
    transition: transform 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

nav .link-column a:hover {
    color: var(--nav-text-hover);
}

nav .link-column a:hover::before {
    transform: translateY(-50%) scaleX(1);
}

nav .link-column a .link-icon {
    display: none;
}

nav .link-column a .link-text {
    flex: 1;
}

nav .link-column a .link-description {
    font-size: 12px;
    color: var(--nav-text-secondary);
    font-weight: 400;
}

/* View all link styling */
nav .link-column a.view-all {
    color: var(--nav-text-hover);
    font-weight: 600;
    margin-top: 8px;
}

nav .link-column a.view-all::after {
    content: '→';
    margin-left: 4px;
    transition: transform 0.2s ease;
}

nav .link-column a.view-all:hover::after {
    transform: translateX(4px);
}

/* ============================================
   ALTERNATIVE: GRID LAYOUT FOR CATEGORIES
   ============================================ */
nav .dropdown-grid {
    display: grid;
    gap: 24px;
}

nav .dropdown-grid.three-columns,
nav .dropdown-grid.three-col {
    grid-template-columns: repeat(3, 1fr);
}

nav .dropdown-grid.two-columns {
    grid-template-columns: repeat(2, 1fr);
}

/* Category styling for grid layout */
nav .dropdown-category {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

nav .category-title-link {
    display: block;
    padding: 16px;
    margin-bottom: 8px;
    border-radius: 12px;
    text-decoration: none;
    background: var(--feature-card-bg);
    transition: background 0.2s ease, transform 0.2s ease;
}

nav .category-title-link:hover {
    background: var(--feature-card-hover);
    transform: translateY(-2px);
}

nav .category-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--nav-text);
    margin-bottom: 6px;
}

nav .category-description {
    font-size: 13px;
    color: var(--nav-text-secondary);
    line-height: 1.4;
}

/* Dropdown items in category */
nav .dropdown-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 10px 12px;
    border-radius: 8px;
    text-decoration: none;
    transition: background 0.2s ease;
}

nav .dropdown-item:hover {
    background: var(--feature-card-bg);
}

nav .dropdown-item-icon {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--feature-card-bg);
    border-radius: 8px;
    font-size: 11px;
    font-weight: 700;
    color: var(--nav-text);
    letter-spacing: -0.02em;
}

nav .dropdown-item-content {
    flex: 1;
    min-width: 0;
}

nav .dropdown-item-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--nav-text);
    margin-bottom: 2px;
    line-height: 1.3;
}

nav .dropdown-item-description {
    font-size: 12px;
    color: var(--nav-text-secondary);
    line-height: 1.4;
}

/* ============================================
   MOBILE MENU BUTTON (Hamburger)
   ============================================ */
nav .mobile-menu-btn {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 48px;
    height: 48px;
    min-width: 48px;
    min-height: 48px;
    padding: 0;
    border: none;
    cursor: pointer;
    z-index: 2700;
    position: relative;
    background: transparent;
    /* Hide the text character */
    font-size: 0;
    color: transparent;
    /* iOS touch fixes */
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    user-select: none;
    touch-action: manipulation;
}

nav .mobile-menu-btn::before,
nav .mobile-menu-btn::after {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 22px;
    height: 2px;
    background: var(--nav-text);
    border-radius: 2px;
    transition: transform 0.3s ease, top 0.3s ease, box-shadow 0.3s ease;
}

/* Top line + Middle line (via box-shadow) */
nav .mobile-menu-btn::before {
    top: 15px;
    box-shadow: 0 8px 0 var(--nav-text);
}

/* Bottom line */
nav .mobile-menu-btn::after {
    top: 31px;
}

/* Hamburger to X animation */
nav .mobile-menu-btn.active::before {
    top: 23px;
    transform: translateX(-50%) rotate(45deg);
    box-shadow: none;
}

nav .mobile-menu-btn.active::after {
    top: 23px;
    transform: translateX(-50%) rotate(-45deg);
}

/* ============================================
   MOBILE MENU CLOSE BUTTON
   ============================================ */
nav .mobile-menu-close {
    display: none;
}

/* ============================================
   MOBILE MENU OVERLAY
   ============================================ */
.mobile-menu-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    opacity: 0;
    visibility: hidden;
    z-index: 2500;
    transition: opacity 0.3s ease, visibility 0.3s;
}

.mobile-menu-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* ============================================
   RESPONSIVE - TABLET & MOBILE
   ============================================ */
@media (max-width: 1400px) {
    nav .dropdown-menu.extra-wide .dropdown-content {
        grid-template-columns: repeat(3, 1fr);
        gap: 32px 48px;
    }

    nav .dropdown-menu.full-width .dropdown-content {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px 48px;
    }

    /* Hide feature card images on smaller desktops */
    nav .feature-card-image {
        display: none;
    }
}

@media (max-width: 1200px) {
    nav .dropdown-content {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 24px 32px;
    }
}

@media (max-width: 1024px) {
    nav {
        padding: 0.75rem 5%;
    }

    nav .logo-image {
        height: 48px;
    }

    nav.scrolled {
        padding: 0.5rem 5%;
    }

    nav.scrolled .logo-image {
        height: 40px;
    }

    /* Show hamburger */
    nav .mobile-menu-btn {
        display: flex;
    }

    /* Hide desktop nav, show as mobile menu */
    nav .nav-links {
        position: fixed;
        top: 0;
        bottom: 0;
        /* iOS Safari 100vh fix - use multiple fallbacks */
        height: 100vh;
        height: 100dvh; /* Dynamic viewport height - iOS 15.4+ */
        height: -webkit-fill-available; /* iOS Safari fallback */
        width: 100%;
        max-width: 400px;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: calc(var(--nav-height-mobile) + 20px) 24px 24px;
        background: var(--nav-bg);
        /* iOS: Use transform for animation */
        right: 0;
        transform: translateX(100%);
        -webkit-transform: translateX(100%);
        transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1), -webkit-transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        overflow-y: auto;
        -webkit-overflow-scrolling: touch; /* iOS smooth scrolling */
        overscroll-behavior: contain; /* Prevent scroll chaining */
        z-index: 2600;
        box-shadow: -10px 0 30px rgba(0, 0, 0, 0.1);
    }

    nav .nav-links.active {
        transform: translateX(0);
        -webkit-transform: translateX(0);
    }

    nav .nav-links > li {
        height: auto;
        border-bottom: 1px solid var(--nav-border);
    }

    nav .nav-links > li:last-child {
        border-bottom: none;
    }

    nav .nav-links > li > a {
        width: 100%;
        padding: 18px 0;
        font-size: 17px;
        justify-content: space-between;
        height: auto;
    }

    /* Add padding-right for dropdown arrow */
    nav .nav-links > li.has-dropdown > a {
        padding-right: 20px;
    }

    /* Remove hover indicator on mobile */
    nav .nav-links > li > a::after {
        display: none;
    }

    /* Dropdown arrow for mobile */
    nav .nav-links > li.has-dropdown > a::before {
        content: '' !important;
        display: block !important;
        position: absolute !important;
        left: auto !important;
        right: 0 !important;
        top: 50%;
        width: 8px;
        height: 8px;
        border-right: 2px solid var(--nav-text);
        border-bottom: 2px solid var(--nav-text);
        border-left: none !important;
        border-top: none !important;
        background: transparent !important;
        transform: translateY(-50%) rotate(45deg);
        transition: transform 0.3s ease;
    }

    nav .nav-links > li.has-dropdown.mobile-open > a::before {
        transform: translateY(-50%) rotate(-135deg);
    }

    /* Mobile dropdown - accordion style */
    nav .dropdown-menu {
        position: static !important;
        transform: none !important;
        top: auto !important;
        left: auto !important;
        right: auto !important;
        width: 100% !important;
        max-width: 100% !important;
        max-height: 0;
        overflow: hidden;
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
        border: none;
        border-top: none;
        box-shadow: none;
        background: #f8f9fa;
        margin: 0;
        padding: 0;
        transition: max-height 0.35s ease;
    }

    nav .has-dropdown.mobile-open .dropdown-menu {
        max-height: 2000px;
    }

    nav .dropdown-content {
        padding: 12px 16px !important;
        display: flex !important;
        flex-direction: column;
        gap: 12px;
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        overflow: hidden !important;
    }

    /* Remove borders and reset padding on mobile */
    nav .dropdown-content > * {
        padding: 0 !important;
        border-right: none !important;
        margin: 0 !important;
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
    }

    nav .dropdown-content > *:first-child,
    nav .dropdown-content > *:last-child {
        padding: 0 !important;
    }

    /* Hide Feature Cards on Mobile - only show link columns */
    nav .dropdown-menu .feature-card,
    nav .dropdown-content .feature-card,
    .feature-card {
        display: none !important;
    }

    /* Hide images on mobile */
    nav .feature-card-image {
        display: none;
    }

    /* Link Columns on Mobile */
    nav .link-column {
        padding: 12px 16px 8px;
        margin: 0;
        border-top: 1px solid var(--nav-border);
    }

    nav .link-column-title {
        margin-bottom: 8px;
        font-size: 10px;
    }

    nav .link-column a {
        padding: 8px 0;
        font-size: 14px;
        padding-left: 0;
    }

    nav .link-column a::before {
        display: none;
    }

    /* Remove hover bridge on mobile */
    nav .has-dropdown::before {
        display: none;
    }

    /* Icon links row */
    nav .nav-links > li > a[download],
    nav .nav-links > li > a[target="_blank"] {
        padding: 18px 0;
    }
}

@media (max-width: 640px) {
    nav .nav-links {
        max-width: 100%;
    }
}

/* ============================================
   iOS SAFARI SPECIFIC FIXES
   ============================================ */
@supports (-webkit-touch-callout: none) {
    /* iOS Safari specific styles */
    nav .nav-links {
        /* Fix for iOS Safari momentum scrolling issues */
        -webkit-overflow-scrolling: touch;
    }

    /* Larger touch targets for iOS */
    nav .mobile-menu-btn {
        min-width: 48px;
        min-height: 48px;
        /* Prevent text selection on long press */
        -webkit-user-select: none;
        user-select: none;
        /* Prevent callout menu on long press */
        -webkit-touch-callout: none;
    }

    /* Prevent double-tap zoom on buttons */
    nav .nav-links > li > a,
    nav .link-column a {
        touch-action: manipulation;
    }

    /* Fix tap highlight */
    nav .nav-links > li > a,
    nav .mobile-menu-btn,
    nav .link-column a,
    nav .feature-card {
        -webkit-tap-highlight-color: transparent;
    }
}

/* ============================================
   PRINT STYLES
   ============================================ */
@media print {
    nav {
        display: none;
    }
}

/* ============================================
   MOBILE FEATURE CARD OVERRIDE - MAX SPECIFICITY
   ============================================ */
@media screen and (max-width: 1024px) {
    nav .dropdown-menu .dropdown-content a.feature-card,
    nav .dropdown-content a.feature-card,
    nav a.feature-card,
    .dropdown-menu a.feature-card,
    a.feature-card {
        display: none !important;
        visibility: hidden !important;
        height: 0 !important;
        overflow: hidden !important;
        margin: 0 !important;
        padding: 0 !important;
    }
}