/* CSS Variables für einfache Anpassungen */
:root {
    --primary-color: #0066cc;
    --secondary-color: #003d7a;
    --text-dark: #1a1a1a;
    --text-light: #666;
    --bg-light: #f8f9fa;
    --white: #ffffff;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 5px 20px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s ease;
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --primary-color: #4d9fff;
    --secondary-color: #6db3ff;
    --text-dark: #e0e0e0;
    --text-light: #b0b0b0;
    --bg-light: #1a1a1a;
    --white: #242424;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 5px 20px rgba(0, 0, 0, 0.4);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background: var(--white);
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    background: var(--white);
    padding: 20px 0;
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    text-align: center;
    margin: 0;
}

.header-wrapper {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 60px;
}

/* Dark Mode Toggle */
.theme-toggle {
    position: absolute;
    right: 0;
    background: none;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.5rem;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.theme-toggle:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: rotate(20deg);
}

/* Hero Section */
.hero {
    width: 100%;
    position: relative;
    background: #000;
}

.hero .video-wrapper {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%; /* 16:9 Aspect Ratio */
    height: 0;
    overflow: hidden;
}

.hero .video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

/* USP Section */
.usp {
    padding: 80px 0;
    background: var(--bg-light);
}

.usp h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 60px;
    color: var(--text-dark);
}

.usp-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
}

.usp-card {
    background: var(--white);
    padding: 40px 30px;
    border-radius: 12px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.usp-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.usp-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.usp-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.usp-card p {
    color: var(--text-light);
    line-height: 1.8;
}

/* Demo Videos Carousel */
.demos {
    padding: 80px 0;
    background: var(--white);
}

.demos h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 60px;
    color: var(--text-dark);
}

.carousel {
    position: relative;
    max-width: 1100px;
    margin: 0 auto;
}

.carousel-container {
    overflow: hidden;
    padding: 0 60px;
}

.carousel-track {
    display: flex;
    transition: transform 0.5s ease;
}

.demo-card {
    min-width: 100%;
    padding: 0 15px;
}

.demo-card .video-wrapper {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}

.demo-card .video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border-radius: 12px;
}

.demo-card h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.demo-card p {
    color: var(--text-light);
}

.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: var(--primary-color);
    color: var(--white);
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    font-size: 2rem;
    cursor: pointer;
    transition: var(--transition);
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}

.carousel-btn:hover {
    background: var(--secondary-color);
    transform: translateY(-50%) scale(1.1);
}

.carousel-btn.prev {
    left: 0;
}

.carousel-btn.next {
    right: 0;
}

/* Contact Section */
.contact {
    padding: 80px 0;
    background: var(--bg-light);
    text-align: center;
}

.contact h2 {
    font-size: 2.5rem;
    margin-bottom: 30px;
    color: var(--text-dark);
}

.contact-content p {
    font-size: 1.2rem;
    color: var(--text-light);
    margin-bottom: 30px;
}

.btn {
    display: inline-block;
    background: var(--primary-color);
    color: var(--white);
    padding: 15px 40px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 600;
    transition: var(--transition);
    margin-bottom: 30px;
}

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

.contact-info {
    margin-top: 40px;
}

.contact-info p {
    font-size: 1.1rem;
    color: var(--text-dark);
    margin: 10px 0;
}

/* Footer */
footer {
    background: #1a1a1a;
    color: #ffffff;
    padding: 30px 0;
}

[data-theme="dark"] footer {
    background: #0a0a0a;
    border-top: 1px solid #333;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

footer a {
    color: #ffffff;
    text-decoration: none;
    transition: var(--transition);
}

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

[data-theme="dark"] footer a:hover {
    color: #4d9fff;
}

/* Responsive Design */
@media (min-width: 600px) and (max-width: 900px) {
    /* Fix for 3 cards on 2-column layout - center the orphan card */
    .usp-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .usp-card:nth-child(3) {
        grid-column: 1 / -1;
        max-width: 400px;
        justify-self: center;
    }
}

@media (max-width: 768px) {
    .logo {
        font-size: 1.5rem;
    }
    
    .theme-toggle {
        width: 40px;
        height: 40px;
        font-size: 1.2rem;
    }

    .usp h2,
    .demos h2,
    .contact h2 {
        font-size: 2rem;
    }

    .usp,
    .demos,
    .contact {
        padding: 60px 0;
    }

    .usp-grid {
        gap: 30px;
    }

    .carousel-container {
        padding: 0 50px;
    }

    .carousel-btn {
        width: 40px;
        height: 40px;
        font-size: 1.5rem;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .carousel-container {
        padding: 0 40px;
    }

    .carousel-btn {
        width: 35px;
        height: 35px;
        font-size: 1.2rem;
    }

    .btn {
        padding: 12px 30px;
        font-size: 1rem;
    }
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}