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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    background-color: #f5f5f5;
    color: #333;
}

.container {
    max-width: 800px;
    margin: 2rem auto;
    padding: 2rem;
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    color: #2c3e50;
    margin-bottom: 2rem;
}

h2 {
    color: #34495e;
    margin: 1rem 0;
}

.input-section {
    margin-bottom: 2rem;
}

textarea {
    width: 100%;
    height: 150px;
    padding: 1rem;
    border: 2px solid #ddd;
    border-radius: 5px;
    resize: vertical;
    font-size: 1rem;
}

textarea:focus {
    outline: none;
    border-color: #3498db;
}

.indices-section {
    margin-bottom: 2rem;
}

.checkbox-group {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1rem;
    margin: 1rem 0;
    padding: 1rem;
    border: 1px solid #eee;
    border-radius: 5px;
}

label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 1rem;
}

input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

button {
    display: block;
    width: 100%;
    padding: 1rem;
    background-color: #3498db;
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #2980b9;
}

.results-section {
    margin-top: 2rem;
    padding-top: 2rem;
    border-top: 2px solid #eee;
}

#resultsContent {
    margin-top: 1rem;
}

.result-item {
    background-color: #f8f9fa;
    padding: 1rem;
    margin-bottom: 1rem;
    border-radius: 5px;
    border-left: 4px solid #3498db;
}

.result-item h3 {
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

.result-item p {
    margin-bottom: 0.5rem;
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .container {
        margin: 1rem;
        padding: 1rem;
    }
    
    .checkbox-group {
        grid-template-columns: 1fr;
    }
}