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

body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    width: 100%;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    min-height: 100vh;
    text-align: center;
    padding: 10px 20px;
}

h1 {
    color: #333;
    margin-bottom: 10px;
}

.intro {
    font-size: 16px;
    color: #555;
    margin-bottom: 20px;
}

.crypto-box {
    display: flex;
    justify-content: space-between;
    gap: 20px;
    width: 100%;
}

.input-section, .output-section {
    flex: 1;
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.15);
}

label {
    display: block;
    font-weight: bold;
    margin-bottom: 10px;
    color: #555;
}

textarea {
    width: 100%;
    height: 400px;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    resize: vertical;
    font-family: monospace;
    font-size: 14px;
}

textarea:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 5px rgba(0,123,255,0.3);
}

@media (max-width: 768px) {
    .crypto-box {
        flex-direction: column;
    }
}

.footer a {
    color: #007bff;
    text-decoration: none;
    font-size: 16px;
}

.footer a:hover {
    text-decoration: underline;
}