:root {
    --primary-color: #007BFF;
    --secondary-color: #dc3545;
    --text-color: #333;
    --title-color: #004d99;
    --bg-gradient: linear-gradient(135deg, #e6f7ff, #f0f8ff);
    --base-font-size: clamp(1rem, 2vw, 1.2rem); 
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-gradient);
    margin: 0;
    padding: 0;
    color: var(--text-color);
    font-size: var(--base-font-size);
}

h1 {
    color: var(--title-color);
    margin: 1rem 0;
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
    text-align: center;
    font-family: 'Georgia', serif;
}

#main {
    background-color: #fff;
    border-radius: 15px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    padding: clamp(1.5rem, 3vw, 2.5rem);
    width: clamp(300px, 85vw, 90%); 
    max-width: 90%; 
    margin: 2rem auto;
    transition: transform 0.3s ease;
    box-sizing: border-box; 
}

#main:hover {
    transform: scale(1.02);
}

.step-title {
    color: var(--title-color);
    font-size: clamp(1.3rem, 2.5vw, 1.6rem);
    margin-bottom: 1.2rem;
    padding-bottom: 0.5rem;
    font-family: 'Brush Script MT', cursive;
    font-style: italic;
    letter-spacing: 1px;
    border-bottom: 2px solid rgba(0, 77, 153, 0.2);
}

textarea {
    width: 100%;
    height: clamp(120px, 25vh, 200px);
    padding: 1rem;
    margin-bottom: 1.5rem;
    border: 1px solid #ccc;
    border-radius: 8px;
    box-sizing: border-box;
    resize: vertical;
    font-size: var(--base-font-size);
    transition: border-color 0.3s ease;
    font-family: 'Segoe UI', sans-serif;
}

textarea:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 5px rgba(0, 123, 255, 0.5);
}

#format-detection {
    font-size: 1.1em;
    color: #555;
    margin-bottom: 15px;
    padding: 10px;
    background-color: #f5f5f5;
    border-radius: 5px;
    border-left: 4px solid #007BFF;
}

#format-detection #detectedFormatLabel {
    font-weight: bold;
    color: #004d99;
}

.radio-group {
    margin: 1rem 0;
    padding: 1rem;
    background-color: #f9f9f9;
    border-radius: 8px;
    transition: all 0.3s ease;
}

.radio-group input[type="radio"] + br {
    display: none;
}

.radio-group input[type="radio"] {
    display: block;
    margin-bottom: 1.2rem;
}

.radio-group input[type="radio"] {
    appearance: none;
    -webkit-appearance: none;
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    outline: none;
    cursor: pointer;
    position: relative;
}

.radio-group input[type="radio"]:checked::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 0.75rem;
    height: 0.75rem;
    background-color: var(--primary-color);
    border-radius: 50%;
}

.radio-group input[type="radio"]::after {
    content: attr(data-text);
    display: inline;
    margin-left: 3rem; 
    font-size: 24px; 
    color: var(--text-color);
    cursor: pointer;
}

.radio-group input[type="radio"]:hover {
    border-color: var(--title-color);
}

.radio-group input[type="radio"]:hover::after {
    color: var(--title-color);
}

.radio-group input[type="radio"]:checked::after {
    font-weight: 600;
    color: var(--title-color);
}

input[type="button"] {
    padding: clamp(0.8rem, 2vw, 1rem) clamp(1.2rem, 3vw, 1.8rem);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: var(--base-font-size);
    transition: all 0.3s ease;
    font-weight: 500;
}

input[type="button"]:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

input[type="button"]:active {
    transform: translateY(-1px);
}

input[type="button"][value="Submit"],
input[type="button"][value="Convert"] {
    background: linear-gradient(135deg, #007BFF, #0056b3);
    color: #fff;
}

input[type="button"][value="Exit"] {
    background: linear-gradient(135deg, #dc3545, #bd2130);
    color: #fff;
}

#resultBox {
    background-color: #f9f9f9;
    border: 1px solid #eee;
    border-radius: 8px;
    padding: 1.2rem;
    margin-bottom: 1.5rem;
    white-space: pre-wrap;
    font-family: 'Courier New', monospace;
    font-size: clamp(0.9rem, 1.8vw, 1.1rem);
    min-height: 80px;
    box-shadow: inset 0 0 5px rgba(0, 0, 0, 0.1);
}

@media (max-width: 480px) {
    .button-group {
        flex-direction: column;
    }

    input[type="button"] {
        width: 100%;
        margin-bottom: 0.8rem;
    }

    label {
        display: block;
        margin-bottom: 0.5rem;
    }
}