:root {
    --background-color: #e9ecef;
    --accent-color: #007bff;
    --highlight-color: #0056b3;
    --text-color: #6c757d;
    --button-color: #007bff;
    --button-highlight-color: #0056b3;
    --section-color: #f8fafc;
}

body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--background-color);
}

main {
    padding: 1.5rem;
}

header {
    display: flex;
    justify-content: center;
    background-color: var(--accent-color);
    padding: 1rem;
    box-shadow: 0 0.25rem 0.5rem rgba(0, 0, 0, 0.2);
}

h1 {
    font-size: 2rem;
    color: white;
    margin: 0;
    font-weight: bold;
    text-align: center;
}

h2 {
    margin-top: 0;
}
.form-group {
    margin-bottom: 0.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

input[type="text"], input[type="number"] {
    padding: 0.5rem;
    width: 100%;
    box-sizing: border-box;
    border: 1px solid var(--text-color);
    border-radius: 0.25rem;
}

input[type="file"] {
    padding: 0.5rem;
    width: 100%;
    box-sizing: border-box;
    border: 1px solid var(--text-color);
    border-radius: 0.25rem;
    margin-bottom: 0.5rem;
}

select {
    padding: 0.5rem;
    width: 100%;
    box-sizing: border-box;
    border: 1px solid var(--text-color);
    border-radius: 0.25rem;
    background-color: white;
    appearance: none;
    cursor: pointer;
}

button {
    padding: 0.5rem 1rem;
    background-color: var(--button-color);
    color: white;
    border: none;
    border-radius: 0.25rem;
    cursor: pointer;
    margin-bottom: 1rem;
}

button:hover {
    background-color: var(--button-highlight-color);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

#result {
    padding: 0.5rem;
    border-radius: 0.25rem;
}

.column {
    padding: 0.5rem;
}

#insertion-column {
    width: 40%;
}

#queries-column {
    width: 40%;
}

#save-load-column {
    width: 20%;
}

section {
    background-color: var(--section-color);
    padding: 1rem;
    border-radius: 0.25rem;
    box-shadow: 0 0.25rem 0.5rem rgba(0, 0, 0, 0.2);
}

#column-section {
    display: flex;
    width: auto;
    column-gap: 1rem;
    padding-bottom: 0;
}

#result-section {
    margin-top: 1.5rem;
}

#result table {
    border-collapse: collapse;
    width: 100%;
}

#result td, #result th {
    padding: 0.8rem;
}

#result tr:nth-child(odd) {
    background-color: #b3cdff;
}

#result tr:nth-child(even) {
    background-color: #e7f0ff;
}

#result th {
    padding-top: 1rem;
    padding-bottom: 1rem;
    text-align: left;
    background-color: var(--accent-color);
    color: white;
    font-weight: bold;
}

#status-section {
    margin-top: 1.5rem;
    padding: 1rem 1.5rem;
}

#status {
    padding: 0.5rem;
}

#status.success {
    background-color: #28a745;
    color: white;
}

#status.error {
    background-color: #ff6c6c;
    color: white;
}