/* --- Variables & Reset --- */
:root {
    --bg-dark: #111111;
    --bg-light: #ffffff;
    --text-main: #111111;
    --text-light: #f4f4f4;
    --accent: #3b82f6; /* Subtle Tech Blue */
    --gray: #888888;
    --font-stack: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-stack);
    line-height: 1.6;
    color: var(--text-main);
}

/* --- Utilities --- */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }

/* --- Navigation --- */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid #eee;
}

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

.logo {
    font-weight: 700;
    font-size: 1.5rem;
    letter-spacing: -0.05em;
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 500;
}

/* --- Hero Section --- */
.hero {
    background-color: var(--bg-dark);
    color: var(--text-light);
    height: 85vh; /* Takes up most of the screen */
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.hero h1 {
    font-size: 3.5rem;
    line-height: 1.1;
    margin-bottom: 20px;
    letter-spacing: -0.02em;
}

.subtitle {
    font-size: 1.2rem;
    color: var(--gray);
    max-width: 600px;
    margin: 0 auto 40px auto;
}

/* --- Buttons --- */
.btn {
    display: inline-block;
    padding: 12px 30px;
    background-color: var(--text-light);
    color: var(--bg-dark);
    border-radius: 4px;
    font-weight: 600;
    transition: transform 0.2s ease;
}

.btn:hover {
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--text-light);
    color: var(--text-light);
    cursor: pointer;
    font-size: 1rem;
}

.btn-outline:hover {
    background: var(--text-light);
    color: var(--bg-dark);
}

/* --- Features Section --- */
.section-light {
    padding: 100px 0;
    background: var(--bg-light);
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
}

.card p {
    color: #555;
}

/* --- Contact Section --- */
.section-dark {
    padding: 100px 0;
    background-color: #1a1a1a;
    color: var(--text-light);
}

.contact-container {
    max-width: 600px;
    text-align: center;
}

.contact-container h2 {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.contact-form {
    margin-top: 40px;
    text-align: left;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.9rem;
    color: var(--gray);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    background: #222;
    border: 1px solid #333;
    color: #fff;
    border-radius: 4px;
    font-family: inherit;
}

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

/* --- Footer & Imprint --- */
#impressum {
    background: #000;
    color: #666;
    padding: 60px 0;
    font-size: 0.85rem;
    border-top: 1px solid #222;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
}

.footer-block h4 {
    color: #fff;
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.footer-block h5 {
    color: #999;
    margin-bottom: 10px;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 1px;
}

.legal-text p {
    margin-bottom: 15px;
    line-height: 1.5;
}

.legal-text a {
    color: #fff;
    text-decoration: underline;
}

/* --- Mobile Responsiveness --- */
@media (max-width: 768px) {
    .hero h1 { font-size: 2.5rem; }
    .nav-links { display: none; /* Hide nav links on small mobile for simplicity */ }
    .grid-3 { grid-template-columns: 1fr; }
}