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

/* Mobile First - Base Styles */
body {
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: #1a1a1a;
    padding: 1rem;
    background: #fff;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

main {
    max-width: 800px;
    margin: 0 auto;
}

/* Hero Section */
.hero {
    margin: 3rem 0;
}

h1 {
    font-size: 2rem;
    font-weight: 300;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.subtitle {
    font-size: 1.125rem;
    color: #666;
    font-weight: 300;
}

/* About Section */
.about {
    margin: 3rem 0;
}

h2 {
    font-size: 1.5rem;
    font-weight: 400;
    margin-bottom: 1rem;
}

.about p {
    margin-bottom: 1rem;
    color: #333;
}

/* Download Section */
.download {
    margin: 3rem 0;
}

.btn-download {
    display: inline-block;
    padding: 1rem 2rem;
    background: #1a1a1a;
    color: white;
    text-decoration: none;
    border-radius: 4px;
    font-size: 1rem;
    transition: all 0.3s ease;
    border: 2px solid #1a1a1a;
    /* Mobile: Volle Breite für einfacheres Tippen */
    width: 100%;
    text-align: center;
    min-height: 44px; /* Apple Touch-Guideline */
}

.btn-download:hover {
    background: white;
    color: #1a1a1a;
}

.btn-download:active {
    transform: scale(0.98);
}

/* Footer */
footer {
    margin: 4rem 0 2rem;
    padding-top: 2rem;
    border-top: 1px solid #e0e0e0;
    color: #666;
    font-size: 0.875rem;
}

/* Tablet & Desktop */
@media (min-width: 768px) {
    body {
        padding: 2rem;
    }

    .hero {
        margin: 6rem 0;
    }

    h1 {
        font-size: 3.5rem;
    }

    .subtitle {
        font-size: 1.5rem;
    }

    h2 {
        font-size: 2rem;
    }

    .about {
        margin: 4rem 0;
    }

    /* Desktop: Button nicht volle Breite */
    .btn-download {
        width: auto;
    }
}

/* Large Desktop */
@media (min-width: 1200px) {
    .hero {
        margin: 8rem 0;
    }
}