body {
    font-family: 'Courier New', Courier, monospace;
    background-color: #000080; /* Navy Blue */
    color: #00FF00; /* Bright Green */
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    margin: 0;
    padding: 20px;
    box-sizing: border-box;
}

.container {
    background-color: #000000; /* Black */
    border: 2px solid #00FF00;
    box-shadow: 0 0 15px #00FF00;
    padding: 25px;
    border-radius: 8px;
    width: 100%;
    max-width: 800px;
    box-sizing: border-box;
    text-align: center;
}

h1 {
    color: #FFFF00; /* Yellow */
    text-shadow: 0 0 5px #FFFF00;
    margin-bottom: 25px;
}

.input-section {
    margin-bottom: 30px;
}

label {
    margin-right: 10px;
    font-size: 1.1em;
}

input[type="number"] {
    background-color: #333;
    color: #00FF00;
    border: 1px solid #00FF00;
    padding: 8px;
    border-radius: 4px;
    width: 120px;
    text-align: center;
    font-family: 'Courier New', Courier, monospace;
    font-size: 1em;
    margin-right: 10px;
}

button {
    background-color: #008000; /* Dark Green */
    color: white;
    border: 1px solid #00FF00;
    padding: 10px 15px;
    border-radius: 5px;
    cursor: pointer;
    font-family: 'Courier New', Courier, monospace;
    font-size: 1em;
    transition: background-color 0.2s, color 0.2s;
}

button:hover {
    background-color: #00FF00;
    color: #000;
}

.content-display {
    background-color: #000000;
    border: 1px dashed #00FF00;
    min-height: 300px;
    padding: 20px;
    text-align: left;
    overflow-y: auto;
    max-height: 500px;
    font-size: 0.95em;
    line-height: 1.6;
}

/* Specific styles for old internet content */
.old-internet {
    font-family: 'Comic Sans MS', cursive; /* A bit cheesy, but fitting for 90s */
    background-color: #C0C0C0; /* Light Gray */
    color: #000000; /* Black */
    border: 3px groove #808080; /* Gray */
    padding: 15px;
}

.old-internet p, .old-internet a, .old-internet span {
    color: #000000;
}

.old-internet h2 {
    color: #800080; /* Purple */
    text-align: center;
    border-bottom: 1px dashed #808080;
    padding-bottom: 5px;
    margin-bottom: 15px;
}

.old-internet .marquee-container {
    background-color: #FFCC00;
    padding: 5px;
    margin-bottom: 15px;
    border: 1px solid #CC9900;
    overflow: hidden;
}

.old-internet .marquee-text {
    display: inline-block;
    white-space: nowrap;
    animation: marquee 10s linear infinite;
}

@keyframes marquee {
    0% { transform: translateX(100%); }
    100% { transform: translateX(-100%); }
}

.old-internet .blink-text {
    animation: blinker 1s linear infinite;
    font-weight: bold;
    color: red;
}

@keyframes blinker {
    50% { opacity: 0; }
}

.old-internet table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

.old-internet table, .old-internet th, .old-internet td {
    border: 1px solid #A0A0A0;
    padding: 8px;
    text-align: center;
}

.old-internet a {
    color: #0000FF; /* Blue */
    text-decoration: underline;
}

.old-internet a:visited {
    color: #800080; /* Purple */
}

/* Modern internet style */
.modern-internet {
    font-family: 'Arial', sans-serif;
    background-color: #F8F8F8;
    color: #333;
    border: none;
    padding: 25px;
    text-align: left;
}

.modern-internet h2 {
    color: #007bff;
    text-align: left;
    border-bottom: 1px solid #eee;
    padding-bottom: 10px;
    margin-bottom: 20px;
}

.modern-internet p {
    color: #555;
    margin-bottom: 10px;
}

.modern-internet .card {
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    padding: 15px;
    margin-bottom: 15px;
}

.modern-internet .button {
    display: inline-block;
    background-color: #28a745;
    color: white;
    padding: 8px 15px;
    border-radius: 5px;
    text-decoration: none;
    margin-top: 10px;
}

/* Future internet style */
.future-internet {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #2c3e50, #34495e); /* Dark blue-grey gradient */
    color: #00FFFF; /* Cyan */
    border: 2px solid #00FFFF;
    box-shadow: 0 0 20px #00FFFF;
    padding: 30px;
    text-align: center;
    text-shadow: 0 0 5px #00FFFF;
}

.future-internet h2 {
    color: #FF00FF; /* Magenta */
    text-align: center;
    font-size: 2.2em;
    margin-bottom: 25px;
    border-bottom: 1px solid #FF00FF;
    padding-bottom: 10px;
}

.future-internet p {
    color: #B0E0E6; /* Light Blue */
    font-size: 1.1em;
    margin-bottom: 15px;
}

.future-internet .data-stream {
    display: inline-block;
    background-color: rgba(0, 255, 255, 0.1);
    padding: 10px 15px;
    border-radius: 20px;
    border: 1px solid #00FFFF;
    margin-top: 20px;
    font-weight: bold;
    letter-spacing: 1px;
}

.lottie-animation {
    width: 150px;
    height: 150px;
    margin: 20px auto;
}