body {
    background-color: #121212;
    color: #e0e0e0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    margin: 0;
    line-height: 1.6;
}

.container {
    width: 80%;
    max-width: 960px;
    margin: 0 auto;
    padding: 20px;
}

/* Navigation Bar */
.top-nav {
    background-color: #1e1e1e;
    border-bottom: 1px solid #333;
    padding: 10px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.nav-brand-group {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: bold;
    color: #ffffff;
}

.nav-subtitle {
    font-size: 0.8rem;
    color: #888888;
    margin-top: -5px;
}

.nav-links {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
}

.nav-links li {
    margin-left: 25px;
}

.nav-links a {
    font-size: 1rem;
}

header {
    text-align: center;
    padding: 100px 0;
}

header h1 {
    font-size: 4rem;
    color: #ffffff;
    margin-bottom: 10px;
}

header .subtitle {
    font-size: 1.5rem;
    color: #a0a0a0;
}

/* Download Button */
.btn-download {
    display: inline-block;
    background-color: #007aff;
    color: #ffffff;
    padding: 12px 25px;
    border-radius: 25px;
    font-weight: bold;
    text-decoration: none;
    transition: background-color 0.3s ease;
}

.button-group {
    margin-top: 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.btn-manual {
    color: #8BC34A; /* Light Green */
    font-size: 0.9rem;
    font-weight: bold;
}

.btn-manual:hover {
    color: #9CCC65; /* Lighter green on hover */
}

.btn-download:hover {
    background-color: #0056b3;
    text-decoration: none;
}

main {
    display: block;
}

section {
    padding: 60px 0;
    border-bottom: 1px solid #333;
}

section:last-of-type {
    border-bottom: none;
}

h2 {
    font-size: 2.5rem;
    color: #ffffff;
    text-align: center;
    margin-bottom: 40px;
}

.logo {
    display: block;
    margin: 0 auto 30px auto;
    max-width: 150px;
    border-radius: 12px;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-item {
    background-color: #1e1e1e;
    padding: 25px;
    border-radius: 8px;
    border: 1px solid #333;
}

.feature-item h3 {
    font-size: 1.25rem;
    color: #ffffff;
    margin-top: 0;
}

.tech-stack ul {
    list-style: none;
    padding: 0;
}

.tech-stack li {
    background-color: #1e1e1e;
    padding: 15px;
    margin-bottom: 10px;
    border-radius: 5px;
    border-left: 3px solid #007aff;
}

footer {
    text-align: center;
    padding: 50px 0;
    margin-top: 40px;
}

footer p {
    font-size: 1rem;
    color: #a0a0a0;
}

a {
    color: #007aff;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 3rem;
    }
    header .subtitle {
        font-size: 1.2rem;
    }
    h2 {
        font-size: 2rem;
    }
}