/* Importing Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@400;500;700&display=swap');

/* CSS Variables for Easy Theming */
:root {
    --primary-color: #0078D4; /* Microsoft Blue */
    --secondary-color: #f3f2f1; /* Light Gray */
    --accent-color: #ffffff; /* White */
    --text-color: #323130; /* Dark Gray */
    --heading-color: #323130; /* Dark Gray */
    --border-color: #edebe9; /* Light Border */
    --button-hover-color: #005a9e; /* Darker Blue */
    --danger-color: #a4262c; /* Red for Delete Buttons */
    --danger-hover-color: #83151b; /* Darker Red */
    --font-family: 'Roboto', sans-serif;
    --transition-speed: 0.3s;
    --max-width: 1200px;
    --container-padding: 20px;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--secondary-color);
    color: var(--text-color);
    line-height: 1.6;
    padding: var(--container-padding);
}

header.header {
    text-align: center;
    margin-bottom: 30px;
}

h1, h2, h3 {
    color: var(--heading-color);
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

h2 {
    font-size: 1.8rem;
    margin-bottom: 15px;
}

h3 {
    font-size: 1.4rem;
    margin-bottom: 10px;
}

/* Container */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
}

/* Card Styles */
.card {
    background-color: var(--accent-color);
    padding: 25px 30px;
    margin-bottom: 30px;
    border-radius: 6px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: box-shadow var(--transition-speed);
}

.card:hover {
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

/* Form Group */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text-color);
}

.form-group .form-control {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1rem;
    transition: border-color var(--transition-speed), box-shadow var(--transition-speed);
}

.form-group .form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(0, 120, 212, 0.2); /* Light blue shadow */
    outline: none;
}

/* Divider */
.divider {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: 30px 0;
}

/* Table Styles */
.table-responsive {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 15px;
}

table thead {
    background-color: var(--primary-color);
    color: var(--accent-color);
}

table th,
table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    font-size: 1rem;
}

table th.action-column,
table td.action-column {
    text-align: center;
}

table tbody tr:nth-child(even) {
    background-color: #f3f2f1;
}

table tbody tr:hover {
    background-color: #eaeaea;
}

/* Button Styles */
.button-group {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

button {
    padding: 10px 20px;
    background-color: var(--primary-color);
    color: var(--accent-color);
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color var(--transition-speed), transform var(--transition-speed);
    min-width: 150px;
    text-align: center;
}

button:hover {
    background-color: var(--button-hover-color);
    transform: translateY(-2px);
}

button:active {
    transform: translateY(0);
}

.btn-primary {
    background-color: #0078D4; /* Microsoft Blue */
}

.btn-primary:hover {
    background-color: #005a9e;
}

.btn-success {
    background-color: #28a745; /* Green */
}

.btn-success:hover {
    background-color: #218838;
}

.btn-danger {
    background-color: var(--danger-color);
    padding: 6px 12px;
    font-size: 0.9rem;
}

.btn-danger:hover {
    background-color: var(--danger-hover-color);
}

/* Delete Button */
.deleteBtn {
    background-color: var(--danger-color);
    padding: 6px 12px;
    font-size: 0.9rem;
    color: var(--accent-color);
}

.deleteBtn:hover {
    background-color: var(--danger-hover-color);
}

/* Hidden Class */
.hidden {
    display: none;
}

/* Preview Section */
#previewContainer {
    background-color: #f3f2f1;
    padding: 15px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    overflow-x: auto;
}

#previewData {
    font-family: 'Roboto Mono', monospace;
    background-color: #eaeaea;
    padding: 10px;
    border-radius: 4px;
    max-height: 400px;
    overflow-y: auto;
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    .container {
        padding: 0 10px;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    h3 {
        font-size: 1.2rem;
    }

    .button-group {
        flex-direction: column;
        align-items: stretch;
    }

    button {
        width: 100%;
    }
}