* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

body {
    background-color: #f5f5f5;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    background-color: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    width: 90%;
    max-width: 600px;
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 2rem;
}

.input-section {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

input {
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
}

button {
    padding: 0.8rem;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #45a049;
}

.result-section {
    display: grid;
    gap: 1rem;
}

.result-box {
    background-color: #f8f9fa;
    padding: 1rem;
    border-radius: 5px;
    border: 1px solid #dee2e6;
}

.result-box h3 {
    color: #495057;
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

#dnsResult, #portResult {
    color: #666;
    font-size: 0.95rem;
    line-height: 1.4;
}

.success {
    color: #28a745;
}

.error {
    color: #dc3545;
}

@media (max-width: 480px) {
    .container {
        padding: 1rem;
    }
    
    h1 {
        font-size: 1.5rem;
    }
}