:root {
    --primary-color: #4CAF50;
    --dark-background: #121212;
    --light-background: #1a1a1a;
    --text-light: #f0f0f0;
    --text-medium: #a0a0a0;
    --font-family: 'Inter', sans-serif;
    --transition-speed: 0.3s;
}

/* GRUNDEINSTELLUNGEN */
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font-family);
    background-color: var(--dark-background);
    color: var(--text-light);
    line-height: 1.7;
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 6rem 2rem;
}

/* HERO SECTION */
.hero {
    position: relative;
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: #fff;
}
.video-background { position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: -2; }
video { width: 100%; height: 100%; object-fit: cover; }
.overlay { position: absolute; top: 0; left: 0; width: 100%; height: 100%; background: rgba(18, 18, 18, 0.7); z-index: -1; }
.hero-logo { max-width: 350px; margin-bottom: 2rem; filter: drop-shadow(0 0 25px rgba(76, 175, 80, 0.4)); }
.hero-content h1 {
    font-size: 3.5rem;
    font-weight: 700;
    max-width: 25ch;
    margin: 0 auto 1rem;
    text-shadow: 0 2px 20px rgba(0,0,0,0.5);
}
.subtitle { font-size: 1.2rem; font-weight: 300; max-width: 60ch; margin: 0 auto 2.5rem; color: var(--text-medium); }
.cta-button {
    background-color: var(--primary-color);
    color: #fff;
    padding: 1rem 2.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 500;
    transition: all var(--transition-speed) ease;
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}
.cta-button:hover { transform: translateY(-3px); background-color: #5cb85c; }

/* VALUE PROPOSITION SECTION */
.value-proposition { background-color: var(--light-background); text-align: center; }
.value-proposition h2 { font-size: 2.5rem; margin-bottom: 4rem; }
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 3rem; }
.feature-item { text-align: left; }
.feature-icon { font-size: 3rem; margin-bottom: 1rem; }
.feature-item h3 { font-size: 1.5rem; margin-bottom: 0.5rem; color: var(--text-light); }
.feature-item p { color: var(--text-medium); }

/* WHY BIOENERGY SECTION */
.why-bioenergy { background-color: var(--dark-background); }
.container-split {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}
.text-content h2 { font-size: 2.5rem; margin-bottom: 2rem; line-height: 1.3; }
.text-content p { color: var(--text-medium); margin-bottom: 1rem; }
.image-content img { width: 100%; height: auto; border-radius: 10px; }

/* CONTACT FOOTER */
.contact-footer { background-color: var(--light-background); text-align: center; padding: 6rem 2rem 2rem; }
.contact-footer h2 { font-size: 2.8rem; margin-bottom: 1rem; }
.contact-footer > .container > p { margin-bottom: 3rem; font-size: 1.2rem; color: var(--text-medium); }
.contact-email {
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--primary-color);
    text-decoration: none;
    display: inline-block;
    margin-bottom: 6rem;
    position: relative;
}
.contact-email::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 2px;
    bottom: -5px;
    left: 0;
    background-color: var(--primary-color);
    transform: scaleX(0);
    transform-origin: bottom right;
    transition: transform var(--transition-speed) ease-out;
}
.contact-email:hover::after { transform: scaleX(1); transform-origin: bottom left; }
.footer-bottom { border-top: 1px solid #333; padding-top: 2rem; color: var(--text-medium); font-size: 0.9rem; }


/* RESPONSIVE DESIGN */
@media(max-width: 900px) {
    .container-split { grid-template-columns: 1fr; }
    .image-content { grid-row: 1; } /* Bild nach oben auf Mobilgeräten */
    .hero-content h1 { font-size: 2.8rem; }
}
@media(max-width: 600px) {
    body { text-align: left; }
    h1, h2 { text-align: center; }
    .hero-content h1 { font-size: 2.2rem; }
    .subtitle { font-size: 1.1rem; }
    .value-proposition h2, .text-content h2, .contact-footer h2 { font-size: 2rem; }
    .container { padding: 4rem 1.5rem; }
    .contact-footer { padding: 4rem 1.5rem 1.5rem; }
}