:root {
    /* Light Mode - Clean White & Grey */
    --background-color-light: #ffffff;
    --text-color-light: #212529;
    --header-bg-light: #ffffff;
    --card-bg-light: #ffffff;
    --about-bg-light: #ffffff;
    --logo-color-light: #212529;
    --nav-link-color-light: #495057;
    --h2-color-light: #212529;
    --footer-bg-light: #f8f9fa;
    --footer-text-light: #6c757d;
    --input-bg-light: #f1f3f5;
    --input-border-light: #ced4da;

    /* Dark Mode - Black & Grey */
    --background-color-dark: #121212;
    --text-color-dark: #e9ecef;
    --header-bg-dark: #1c1c1c;
    --card-bg-dark: #212121;
    --about-bg-dark: #121212;
    --logo-color-dark: #e9ecef;
    --nav-link-color-dark: #adb5bd;
    --h2-color-dark: #e9ecef;
    --footer-bg-dark: #1c1c1c;
    --footer-text-dark: #adb5bd;
    --input-bg-dark: #2c2c2c;
    --input-border-dark: #495057;

    /* Accent Color - Grey */
    --primary-color: #888888;
    --primary-color-hover: #666666;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    -ms-overflow-style: none;  /* IE and Edge */
    scrollbar-width: none;  /* Firefox */
    scroll-behavior: smooth;
}
html::-webkit-scrollbar {
    display: none; /* Chrome, Safari, and Opera */
}

body {
    font-family: 'Poppins', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--background-color-light);
    color: var(--text-color-light);
    line-height: 1.6;
    transition: background-color 0.4s ease, color 0.4s ease;
    overflow-x: hidden; /* Prevent horizontal scrolling */
}

html.dark-mode body {
    background-color: var(--background-color-dark);
    color: var(--text-color-dark);
}

header {
    background-color: transparent;
    padding: 1rem 5%;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: background-color 0.4s ease, box-shadow 0.4s ease;
}

/* Base styles for logo and nav links (hero section or scrolled) */
.logo-img {
    height: 40px;
    width: auto;
    transition: filter 0.4s ease;
    filter: invert(1); /* Inverted by default for hero */
}

.logo-text {
    color: white;
    font-size: 2rem;
    font-weight: 700;
    margin-left: 0.5rem;
    transition: color 0.4s ease;
}

.desktop-nav li a {
    text-decoration: none;
    color: white;
    font-weight: 500;
    transition: color 0.3s ease;
}

#theme-toggle, #language-switcher, #mobile-theme-toggle, #mobile-language-switcher {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    color: white;
    line-height: 1;
    transition: color 0.4s ease;
}

.sun-icon, .moon-icon {
    stroke: white;
}

/* Styles when scrolled */
header.scrolled {
    background-color: var(--header-bg-light);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

header.scrolled .logo-img {
    filter: none;
}

header.scrolled .logo-text {
    color: var(--logo-color-light);
}

header.scrolled .desktop-nav li a {
    color: var(--nav-link-color-light);
}

header.scrolled #theme-toggle, header.scrolled #language-switcher {
    color: var(--nav-link-color-light);
}

header.scrolled .sun-icon, header.scrolled .moon-icon {
    stroke: var(--nav-link-color-light);
}

/* Dark mode styles for scrolled header */
html.dark-mode header.scrolled {
    background-color: var(--header-bg-dark);
    box-shadow: 0 2px 10px rgba(0,0,0,0.4);
}

html.dark-mode header.scrolled .logo-img {
    filter: invert(1);
}

html.dark-mode header.scrolled .logo-text {
    color: var(--logo-color-dark);
}

html.dark-mode header.scrolled .desktop-nav li a {
    color: var(--nav-link-color-dark);
}

html.dark-mode header.scrolled #theme-toggle, html.dark-mode header.scrolled #language-switcher {
    color: var(--nav-link-color-dark);
}

html.dark-mode header.scrolled .sun-icon, html.dark-mode header.scrolled .moon-icon {
    stroke: var(--nav-link-color-dark);
}

/* Styles for pages without a hero section (e.g., impressum, datenschutz) */
body.no-hero-page header {
    background-color: var(--header-bg-light);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

body.no-hero-page .logo-img {
    filter: none;
}

body.no-hero-page .logo-text {
    color: var(--logo-color-light);
}

body.no-hero-page .desktop-nav li a {
    color: var(--nav-link-color-light);
}

body.no-hero-page #theme-toggle, body.no-hero-page #language-switcher {
    color: var(--nav-link-color-light);
}

body.no-hero-page .sun-icon, body.no-hero-page .moon-icon {
    stroke: var(--nav-link-color-light);
}

/* Dark mode styles for pages without a hero section */
html.dark-mode body.no-hero-page header {
    background-color: var(--header-bg-dark);
    box-shadow: 0 2px 10px rgba(0,0,0,0.4);
}

html.dark-mode body.no-hero-page .logo-img {
    filter: invert(1);
}

html.dark-mode body.no-hero-page .logo-text {
    color: var(--logo-color-dark);
}

html.dark-mode body.no-hero-page .desktop-nav li a {
    color: var(--nav-link-color-dark);
}

html.dark-mode body.no-hero-page #theme-toggle, html.dark-mode body.no-hero-page #language-switcher {
    color: var(--nav-link-color-dark);
}

html.dark-mode body.no-hero-page .sun-icon, html.dark-mode body.no-hero-page .moon-icon {
    stroke: var(--nav-link-color-dark);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
}

.logo-link {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: inherit;
}


.desktop-nav {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    align-items: center;
}

.desktop-nav li {
    margin-left: 2.5rem;
    display: flex;
    align-items: center;
}

.desktop-nav li a:hover {
    color: var(--primary-color);
}

.moon-icon { display: none; }
.sun-icon { display: block; }

html.dark-mode .moon-icon { display: block; }
html.dark-mode .sun-icon { display: none; }

.flag-icon {
    width: 28px;
    height: auto;
    vertical-align: middle;
}

/* Mobile Navigation */
.mobile-nav-toggle {
    display: none; /* Hidden by default */
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
}

.mobile-nav-toggle span, .mobile-nav-toggle span:before, .mobile-nav-toggle span:after {
    content: '';
    display: block;
    width: 28px;
    height: 3px;
    background-color: var(--text-color-light);
    transition: all 0.3s ease-in-out;
    position: relative;
}

/* Default color for mobile toggle in light mode, no hero or scrolled */
body.no-hero-page .mobile-nav-toggle span,
body.no-hero-page .mobile-nav-toggle span:before,
body.no-hero-page .mobile-nav-toggle span:after,
header.scrolled .mobile-nav-toggle span,
header.scrolled .mobile-nav-toggle span:before,
header.scrolled .mobile-nav-toggle span:after {
    background-color: var(--logo-color-light);
}

/* Default color for mobile toggle in light mode, hero section, unscrolled */
.mobile-nav-toggle span,
.mobile-nav-toggle span:before,
.mobile-nav-toggle span:after {
    background-color: white; /* Changed from var(--text-color-light) */
}


/* Dark mode for mobile toggle */
html.dark-mode .mobile-nav-toggle span,
html.dark-mode .mobile-nav-toggle span:before,
html.dark-mode .mobile-nav-toggle span:after {
    background-color: white; /* Changed this line */
}

html.dark-mode header.scrolled .mobile-nav-toggle span,
html.dark-mode header.scrolled .mobile-nav-toggle span:before,
html.dark-mode header.scrolled .mobile-nav-toggle span:after,
html.dark-mode body.no-hero-page .mobile-nav-toggle span,
html.dark-mode body.no-hero-page .mobile-nav-toggle span:before,
html.dark-mode body.no-hero-page .mobile-nav-toggle span:after {
    background-color: var(--logo-color-dark);
}


.mobile-nav-toggle span:before {
    top: -8px;
}

.mobile-nav-toggle span:after {
    top: 8px;
}

.mobile-nav-toggle.active span {
    background-color: transparent;
}

.mobile-nav-toggle.active span:before {
    transform: rotate(45deg);
    top: 0;
}

.mobile-nav-toggle.active span:after {
    transform: rotate(-45deg);
    top: 0;
}

.mobile-nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 300px;
    height: 100%;
    background-color: var(--card-bg-light);
    box-shadow: -5px 0 15px rgba(0,0,0,0.1);
    transition: right 0.4s ease-in-out;
    z-index: 999;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

html.dark-mode .mobile-nav {
    background-color: var(--card-bg-dark);
}

.mobile-nav.active {
    right: 0;
}

.mobile-nav ul {
    list-style: none;
    padding: 0;
    margin: 0;
    text-align: center;
}

.mobile-nav ul li {
    margin: 2rem 0;
}

.mobile-nav ul li a {
    text-decoration: none;
    color: var(--nav-link-color-light);
    font-size: 1.5rem;
    font-weight: 500;
}

html.dark-mode .mobile-nav ul li a {
    color: var(--nav-link-color-dark);
}

.mobile-nav-footer {
    position: absolute;
    bottom: 2rem;
    display: flex;
    gap: 2rem;
}

#mobile-theme-toggle .sun-icon, #mobile-theme-toggle .moon-icon {
    stroke: var(--nav-link-color-light);
}

html.dark-mode #mobile-theme-toggle .sun-icon, html.dark-mode #mobile-theme-toggle .moon-icon {
    stroke: var(--nav-link-color-dark);
}

section {
    padding: 8rem 5%;
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.reveal-on-scroll {
    opacity: 0;
    transform: translateY(50px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
    will-change: opacity, transform;
}

.reveal-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}

@media (max-width: 992px) {
    .desktop-nav { display: none; }
    .mobile-nav-toggle { display: block; }

    .service-cards {
        flex-direction: column;
    }
    .process-arrow {
        transform: rotate(90deg);
        margin: 1rem 0;
    }
    .about-content {
        flex-direction: column;
        text-align: center;
    }
    .about-text h2 {
        text-align: center;
    }
    .hero-content h1 {
        font-size: 3rem;
    }
    .hero-content p {
        font-size: 1.2rem;
    }
    section {
        padding: 6rem 3%; /* Adjusted for medium screens */
    }
}

@media (max-width: 768px) {
    .form-row {
        flex-direction: column;
        gap: 0;
    }
    .hero-content h1 {
        font-size: 2.5rem;
    }
    .hero-content p {
        font-size: 1rem;
    }
    section {
        padding: 4rem 3%; /* Adjusted for small screens */
    }
}

@media (max-width: 480px) {
    header {
        padding: 0.8rem 3%;
    }
    .logo-text {
        font-size: 1.5rem;
    }
    .logo-img {
        height: 30px;
    }
    .hero-content h1 {
        font-size: 2rem;
    }
    .hero-content p {
        font-size: 0.9rem;
    }
    section {
        padding: 3rem 2%; /* Further adjusted for very small screens */
    }
    .mobile-nav {
        width: 100%; /* Take full width on very small screens */
        max-width: none;
    }
}

@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600;700&display=swap');