* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, sans-serif;
}

body {
    background-color: #0f0f0f;
    color: #ffffff;
}

header {
    background-color: #151515;
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 2px solid #1f1f1f;
}

.logo {
    font-size: 28px;
    font-weight: bold;
}

.logo span {
    color: #4caf50;
}

nav a {
    margin-left: 20px;
    color: #cccccc;
    text-decoration: none;
    cursor: pointer;
    transition: color 0.2s;
}

nav a:hover {
    color: #4caf50;
}

main {
    padding: 60px 20px;
    min-height: 80vh;
}

.section {
    display: none;
    max-width: 1000px;
    margin: auto;
    text-align: center;
}

.section.active {
    display: block;
}

h1 {
    font-size: 64px;
    margin-bottom: 10px;
}

.subtitle {
    font-size: 20px;
    opacity: 0.85;
}

.ip-box {
    margin: 40px auto;
    padding: 20px;
    max-width: 320px;
    border: 2px solid #4caf50;
    border-radius: 10px;
}

.ip-box strong {
    display: block;
    font-size: 26px;
    margin: 10px 0;
}

.ip-box button {
    padding: 10px 20px;
    background-color: #4caf50;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: bold;
}

.version {
    margin-top: 20px;
    opacity: 0.7;
}

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    margin-top: 40px;
}

.card {
    background-color: #161616;
    padding: 20px;
    border-radius: 10px;
    border: 1px solid #222;
}

.card h3 {
    margin-bottom: 10px;
    color: #4caf50;
}

ol, ul {
    max-width: 600px;
    margin: 30px auto;
    text-align: left;
}

li {
    margin-bottom: 10px;
}

footer {
    background-color: #151515;
    text-align: center;
    padding: 20px;
    opacity: 0.6;
}

@media (max-width: 768px) {
    h1 {
        font-size: 42px;
    }

    nav {
        display: none;
    }
}