/* ===================================
   CSS Custom Properties (Variables)
   =================================== */
:root {
    /* Colors based on logo */
    --primary-color: #545454;
    --primary-dark: #343434;
    --primary-light: #aaa6a6;
    --secondary-color: #1a1a1a;
    --text-dark: #343434;
    --text-light: #666;
    --white: #ffffff;
    --light-bg: #f8f9fa;
    --gray-bg: #e9ecef;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* Typography */
    --font-primary: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --line-height: 1.6;

    /* Transitions */
    --transition: all 0.3s ease;

    /* Borders */
    --border-radius: 8px;
    --border-radius-sm: 4px;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.15);
}

/* ===================================
   Reset & Base Styles
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: var(--line-height);
    color: var(--text-dark);
    background-color: var(--white);
    overflow-x: hidden;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
    /* Better image rendering */
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    -webkit-transform: translateZ(0);
    transform: translateZ(0);
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

ul {
    list-style: none;
}

/* ===================================
   Container & Layout
   =================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.section {
    padding: var(--spacing-xl) 0;
}

/* ===================================
   Navigation
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--white);
    box-shadow: var(--shadow-md);
    z-index: 1000;
    transition: var(--transition);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
}

.navbar .logo img {
    height: 100px;
    width: auto;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-link {
    font-weight: 500;
    color: var(--text-dark);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--primary-color);
    background-color: var(--light-bg);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--primary-color);
    transition: var(--transition);
    border-radius: 2px;
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: linear-gradient(var(--secondary-color) 0%, var(--text-dark) 100%);
    background-image: url('../img/about/voltbite_transporter.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    background-repeat: no-repeat;
    color: var(--white);
    text-align: center;
    margin-top: 120px;
}

/* Fix for mobile devices - parallax doesn't work well on mobile */
@media (max-width: 768px) {
    .hero {
        background-attachment: scroll;
        min-height: 80vh;
    }
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(26,26,26,0.85) 0%, rgba(44,44,44,0.75) 100%);
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    padding: var(--spacing-md);
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    animation: fadeInUp 1s ease;
}

.hero-subtitle {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 1s ease 0.2s both;
}

.hero-tagline {
    font-size: clamp(1rem, 2vw, 1.5rem);
    margin-bottom: var(--spacing-lg);
    color: var(--primary-light);
    animation: fadeInUp 1s ease 0.4s both;
}

/* ===================================
   Buttons
   =================================== */
.btn {
    display: inline-block;
    padding: 1rem 2rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    font-size: 0.95rem;
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: var(--white);
}

/* ===================================
   Section Headers
   =================================== */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    color: var(--secondary-color);
    margin-bottom: var(--spacing-sm);
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    border-radius: 2px;
}

.section-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-light);
    max-width: 700px;
    margin: var(--spacing-md) auto 0;
}

/* ===================================
   About Section
   =================================== */
.about {
    background-color: var(--white);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.about-text h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    color: var(--secondary-color);
    margin-bottom: var(--spacing-md);
}

.about-text p {
    margin-bottom: var(--spacing-md);
    color: var(--text-light);
}

.about-image {
    position: relative;
    overflow: hidden;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    min-height: 400px;
}

.about-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    transition: transform 0.5s ease;
}

.about-image:hover img {
    transform: scale(1.05);
}

/* ===================================
   Services Section
   =================================== */
.services {
    background-color: var(--light-bg);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.service-card {
    background-color: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    text-align: center;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.service-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 2rem;
}

.service-card h3 {
    font-size: 1.5rem;
    color: var(--secondary-color);
    margin-bottom: var(--spacing-sm);
}

.service-card p {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* ===================================
   Expertise Banner
   =================================== */
.expertise-banner {
    background: linear-gradient(135deg, var(--secondary-color) 0%, var(--text-dark) 100%);
    color: var(--white);
    padding: var(--spacing-xl) 0;
    text-align: center;
}

.expertise-content h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    margin-bottom: var(--spacing-md);
}

.expertise-content p {
    max-width: 900px;
    margin: 0 auto var(--spacing-lg);
    font-size: var(--font-size-lg);
    color: rgba(255,255,255,0.9);
}

/* ===================================
   Smart Home Section
   =================================== */
.smarthome {
    background-color: var(--white);
}

.smarthome-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--spacing-lg);
}

.smarthome-intro p {
    font-size: var(--font-size-lg);
    color: var(--text-light);
}

/* Gallery */
.gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.gallery-item {
    position: relative;
    overflow: hidden;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    aspect-ratio: 4/3;
    cursor: pointer;
    background-color: var(--gray-bg);
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    transition: transform 0.5s ease;
    display: block;
}

.gallery-item:hover img {
    transform: scale(1.1);
}

/* Mobile optimization for gallery */
@media (max-width: 768px) {
    .gallery {
        grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
        gap: var(--spacing-sm);
    }

    .gallery-item {
        aspect-ratio: 16/9;
    }
}

@media (max-width: 480px) {
    .gallery {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }

    .gallery-item {
        aspect-ratio: 16/10;
        min-height: 200px;
    }
}

/* ===================================
   Partners Section
   =================================== */
.partners {
    background-color: var(--light-bg);
    padding: var(--spacing-lg) 0;
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    align-items: center;
    justify-items: center;
}

.partner-item {
    background-color: var(--white);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    max-width: 250px;
}

.partner-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.partner-item img {
    max-height: 100px;
    max-width: 100%;
    width: auto;
    height: auto;
    object-fit: contain;
}

/* Mobile optimization for partners */
@media (max-width: 480px) {
    .partner-item {
        max-width: 200px;
        padding: var(--spacing-sm);
    }

    .partner-item img {
        max-height: 80px;
    }
}

/* ===================================
   Legal Pages (Impressum & Datenschutz)
   =================================== */
.legal-page {
    padding-top: 140px;
}

.legal-content {
    max-width: 900px;
    margin: 0 auto;
}

.legal-content h2 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    color: var(--secondary-color);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.legal-content h3 {
    font-size: clamp(1.25rem, 2.5vw, 1.5rem);
    color: var(--text-dark);
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.legal-content h4 {
    font-size: var(--font-size-lg);
    color: var(--text-dark);
    margin-top: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}

.legal-content p {
    margin-bottom: var(--spacing-sm);
    color: var(--text-light);
    line-height: 1.8;
}

.legal-content ul {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-md);
}

.legal-content ul li {
    list-style: disc;
    margin-bottom: var(--spacing-xs);
    color: var(--text-light);
}

.legal-content a {
    color: var(--primary-color);
    text-decoration: underline;
}

.legal-content a:hover {
    color: var(--primary-dark);
}

/* ===================================
   Contact Section
   =================================== */
.contact {
    background-color: var(--white);
}

.contact-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.contact-method {
    text-align: center;
    padding: var(--spacing-lg);
    background-color: var(--light-bg);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.contact-method:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.contact-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.75rem;
}

.contact-method h3 {
    font-size: 1.25rem;
    color: var(--secondary-color);
    margin-bottom: var(--spacing-sm);
}

.contact-method a {
    color: var(--primary-color);
    font-weight: 600;
    font-size: var(--font-size-lg);
}

.contact-method a:hover {
    color: var(--primary-dark);
}

/* Contact Form */
.contact-form-wrapper {
    max-width: 800px;
    margin: 0 auto;
    background-color: var(--light-bg);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
}

.contact-form .form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm);
    border: 2px solid var(--gray-bg);
    border-radius: var(--border-radius-sm);
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group textarea {
    resize: vertical;
    min-height: 150px;
}

.contact-form button[type="submit"] {
    width: 100%;
}

/* ===================================
   Footer
   =================================== */
.footer {
    background-color: var(--secondary-color);
    color: var(--white);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-section h3 {
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

.footer-section p {
    color: rgba(255,255,255,0.8);
}

.footer-section ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-section ul li a {
    color: rgba(255,255,255,0.8);
    transition: var(--transition);
}

.footer-section ul li a:hover {
    color: var(--primary-color);
    padding-left: 5px;
}

.social-links {
    display: flex;
    gap: var(--spacing-sm);
}

.social-links a {
    width: 40px;
    height: 40px;
    background-color: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.25rem;
    transition: var(--transition);
}

.social-links a:hover {
    background-color: var(--primary-dark);
    transform: translateY(-3px);
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-bottom p {
    color: rgba(255,255,255,0.6);
}

.footer-links {
    display: flex;
    gap: var(--spacing-md);
}

.footer-links a {
    color: rgba(255,255,255,0.8);
}

.footer-links a:hover {
    color: var(--primary-color);
}

/* ===================================
   WhatsApp Button
   =================================== */
.whatsapp-button {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    background-color: #25D366;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 2rem;
    box-shadow: var(--shadow-lg);
    z-index: 999;
    transition: var(--transition);
}

.whatsapp-button:hover {
    transform: scale(1.1);
    box-shadow: 0 10px 30px rgba(37, 211, 102, 0.4);
}

/* ===================================
   Scroll to Top Button
   =================================== */
.scroll-top {
    position: fixed;
    bottom: 100px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    border: none;
    border-radius: 50%;
    color: var(--white);
    font-size: 1.25rem;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-top:hover {
    background-color: var(--primary-dark);
    transform: translateY(-5px);
}

/* ===================================
   Animations
   =================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===================================
   Responsive Design
   =================================== */

/* Tablets */
@media (max-width: 768px) {
    .navbar .logo img {
        height: 80px;
    }

    .nav-toggle {
        display: flex;
        z-index: 1001;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        left: -100%;
        width: 100%;
        height: 100vh;
        background-color: var(--white);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        padding: var(--spacing-xl) var(--spacing-lg);
        transition: left 0.3s ease;
        box-shadow: var(--shadow-lg);
        z-index: 1000;
        gap: var(--spacing-md);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-link {
        width: 100%;
        text-align: center;
        padding: var(--spacing-md);
        font-size: var(--font-size-lg);
        font-weight: 600;
        border-radius: var(--border-radius);
    }

    .nav-link:hover {
        background-color: var(--light-bg);
        color: var(--primary-color);
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .about-image {
        order: -1;
    }

    .services-grid {
        grid-template-columns: 1fr;
    }

    /* Ensure images don't overflow on tablets */
    img {
        max-width: 100%;
        height: auto;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-sm);
    }
}

/* Mobile */
@media (max-width: 480px) {
    :root {
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
    }

    .container {
        padding: 0 var(--spacing-sm);
    }

    .hero {
        margin-top: 60px;
        min-height: 70vh;
    }

    .navbar .logo img {
        height: 8   0px;
    }

    /* Better image rendering on small screens */
    img {
        max-width: 100%;
        height: auto;
        image-rendering: -webkit-optimize-contrast;
        image-rendering: crisp-edges;
    }

    /* Service cards more compact on mobile */
    .service-card {
        padding: var(--spacing-md);
    }

    .service-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }

    /* Contact form optimization */
    .contact-form-wrapper {
        padding: var(--spacing-md);
    }

    .contact-form .form-row {
        grid-template-columns: 1fr;
    }

    /* Contact methods stacked on mobile */
    .contact-methods {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .contact-method {
        padding: var(--spacing-md);
    }

    /* Buttons full width on mobile */
    .btn {
        width: 100%;
        padding: 0.875rem 1.5rem;
    }

    /* WhatsApp and scroll buttons */
    .whatsapp-button {
        width: 50px;
        height: 50px;
        font-size: 1.5rem;
        bottom: 20px;
        right: 20px;
    }

    .scroll-top {
        bottom: 80px;
        right: 20px;
        width: 45px;
        height: 45px;
    }

    /* Expertise banner text */
    .expertise-content {
        padding: 0 var(--spacing-sm);
    }
}

/* Extra Small Mobile Devices */
@media (max-width: 375px) {
    .section-title {
        font-size: 1.75rem;
    }

    .hero-content {
        padding: var(--spacing-sm);
    }

    .service-card,
    .contact-method,
    .partner-item {
        padding: var(--spacing-sm);
    }

    .gallery-item {
        min-height: 180px;
    }

    /* Smaller icons on very small screens */
    .service-icon,
    .contact-icon {
        width: 50px;
        height: 50px;
        font-size: 1.25rem;
    }

    /* Make sections less tall on small screens */
    .section {
        padding: var(--spacing-md) 0;
    }
}

/* Large Screens */
@media (min-width: 1400px) {
    .container {
        max-width: 1320px;
    }
}