:root {
    --primary-color: #007bff;
    --secondary-color: #28a745;
    --bg-light: #f8f9fa;
    --border-color: #dee2e6;
    --shadow-light: 0 4px 12px rgba(0, 0, 0, 0.05);
    --input-bg: #fff;
    --accent-light: #e6f3ff;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-light);
    color: #343a40;
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
}

.container {
    background-color: #fff;
    padding: 30px 40px;
    border-radius: 12px;
    box-shadow: var(--shadow-light);
    max-width: 900px;
    width: 100%;
}

h1 {
    color: var(--primary-color);
    text-align: center;
    padding-bottom: 15px;
    margin-bottom: 30px;
    border-bottom: 3px solid var(--primary-color);
    font-size: 2em;
}

.section-title {
    color: #495057;
    margin-top: 0;
    font-size: 1.5em;
    padding-bottom: 5px;
    border-bottom: 1px solid var(--border-color);
}

.form-section {
    margin-bottom: 30px;
    padding: 20px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--input-bg);
}

.form-group {
    margin-bottom: 15px;
}

label {
    display: block;
    font-weight: 600;
    margin-bottom: 5px;
}

input[type="number"], select {
    width: 100%;
    padding: 10px;
    margin-top: 5px;
    border: 1px solid #ced4da;
    border-radius: 6px;
    box-sizing: border-box;
    transition: border-color 0.3s;
}

input[type="number"]:focus, select:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

small {
    display: block;
    color: #6c757d;
    margin-top: 5px;
    font-style: italic;
}

/* --- Radio Group Styling (Step 2: Leftovers Check) --- */
.radio-group {
    display: flex;
    gap: 15px;
    margin-top: 10px;
}

.radio-group input[type="radio"] {
    position: absolute;
    opacity: 0;
}

.radio-group label {
    display: block;
    padding: 10px 20px;
    background-color: var(--bg-light);
    border: 2px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.3s, border-color 0.3s;
    text-align: center;
    font-weight: 500;
    flex-grow: 1;
}

.radio-group input[type="radio"]:checked + label {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

.radio-group label:hover {
    background-color: #f0f0f0;
}

/* --- Leftovers Grid (Step 3) --- */
.leftovers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 15px;
    padding: 15px;
    background-color: var(--bg-light);
    border-radius: 6px;
}

.leftover-item {
    padding: 10px;
    border: 1px solid #cce5ff;
    border-radius: 4px;
    background-color: var(--accent-light);
}

/* --- Checkbox Styling for Leftover Items (Step 3: Modern Buttons) --- */

.leftover-item .checkbox-control {
    display: block;
    position: relative;
    padding-left: 25px; /* Space for custom checkmark */
    cursor: pointer;
    font-size: 16px;
    user-select: none;
    margin-bottom: 10px;
}

.leftover-item .checkbox-control input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

/* Custom Checkbox Appearance */
.leftover-item .checkmark {
    position: absolute;
    top: 0;
    left: 0;
    height: 18px;
    width: 18px;
    background-color: #eee;
    border-radius: 3px;
    transition: background-color 0.3s;
}

.leftover-item .checkbox-control:hover input ~ .checkmark {
    background-color: #ccc;
}

.leftover-item .checkbox-control input:checked ~ .checkmark {
    background-color: var(--secondary-color);
}

/* Checkmark dot/indicator */
.leftover-item .checkmark:after {
    content: "";
    position: absolute;
    display: none;
}

.leftover-item .checkbox-control input:checked ~ .checkmark:after {
    display: block;
}

.leftover-item .checkbox-control .checkmark:after {
    left: 6px;
    top: 2px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 3px 3px 0;
    transform: rotate(45deg);
}

/* Input field style */
.leftover-input {
    width: 100%;
    margin-top: 5px;
    padding: 8px;
}
.leftover-input:disabled {
    background-color: #f0f0f0;
    cursor: not-allowed;
}

/* --- General Button & Output Styling --- */

#generate-button {
    display: block;
    width: 100%;
    padding: 15px;
    background-color: var(--secondary-color);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1.2em;
    font-weight: bold;
    margin-top: 30px;
    transition: background-color 0.3s;
}

#generate-button:hover {
    background-color: #1e7e34;
}

#requisition-output {
    margin-top: 40px;
    padding-top: 20px;
    border-top: 2px solid var(--primary-color);
}

.summary-box {
    background-color: #f0f8ff;
    padding: 15px;
    border: 1px solid #b8daff;
    border-radius: 6px;
    margin-bottom: 20px;
}

.table-title {
    font-size: 1.3em;
    color: #495057;
    margin-top: 20px;
    margin-bottom: 10px;
}

#requisition-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
    font-size: 0.9em;
}

#requisition-table th, #requisition-table td {
    border: 1px solid var(--border-color);
    padding: 12px 10px;
    text-align: left;
}

#requisition-table th {
    background-color: var(--primary-color);
    color: white;
    font-weight: 600;
}

#requisition-table tr:nth-child(even) {
    background-color: #f7f7f7;
}

.note {
    margin-top: 20px;
    padding: 10px;
    background-color: #fff3cd;
    border: 1px solid #ffeeba;
    border-radius: 4px;
    color: #856404;
}

/* --- RESPONSIVENESS (Media Queries) --- */

/* Tablet and smaller screens */
@media (max-width: 900px) {
    .container {
        padding: 20px;
        margin: 0 10px;
    }
    h1 {
        font-size: 1.8em;
    }
}

/* Mobile screens */
@media (max-width: 600px) {
    h1 {
        font-size: 1.5em;
    }
    .section-title {
        font-size: 1.3em;
    }
    
    /* Stack radio buttons vertically */
    .radio-group {
        flex-direction: column;
        gap: 10px;
    }

    /* Adjust grid layout for leftovers on small screens */
    .leftovers-grid {
        grid-template-columns: 1fr; /* Single column */
    }

    /* Make table content scrollable horizontally */
    #requisition-output {
        overflow-x: auto;
    }
    #requisition-table {
        min-width: 500px; /* Ensure table content doesn't shrink too much */
    }
}