/* ==========================================================================
   Base Layout
   ========================================================================== */

body {
    font-family: Arial, sans-serif;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background-color: #f5f5f5;
}

.container {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

/* ==========================================================================
   Instructions
   ========================================================================== */

.instructions {
    background-color: #e3f2fd;
    padding: 12px;
    border-radius: 6px;
    margin-bottom: 20px;
    font-size: 14px;
    color: #1565c0;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

/* ==========================================================================
   Controls
   ========================================================================== */

.controls {
    margin-bottom: 20px;
    padding: 20px;
    background-color: #f8f9fa;
    border-radius: 8px;
}

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

label {
    display: inline-block;
    width: 120px;
    font-weight: bold;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

select, input, button {
    padding: 8px 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

button {
    background-color: #007bff;
    color: white;
    border: none;
    cursor: pointer;
    margin-right: 10px;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
    -webkit-tap-highlight-color: transparent;
}

button:hover {
    background-color: #0056b3;
}

button:disabled {
    background-color: #6c757d;
    cursor: not-allowed;
}

/* ==========================================================================
   Grid
   ========================================================================== */

#grid {
    display: grid;
    gap: 15px;
    margin: 20px 0;
    justify-content: center;
}

.grid-item {
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid #333;
    border-radius: 8px;
    background-color: white;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
    -webkit-tap-highlight-color: transparent;
}

.grid-item * {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    pointer-events: none;
}

.grid-item:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

.grid-item.clicked {
    background-color: #6c757d !important;
    border-color: #495057;
    opacity: 0.6;
    transform: scale(0.95);
}

.grid-item.clicked::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 20px;
    font-weight: bold;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.5);
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    pointer-events: none;
}

.grid-item.first-item {
    border-color: #28a745;
    border-width: 3px;
}

.grid-item.last-item {
    border-color: #dc3545;
    border-width: 3px;
}

/* ==========================================================================
   Timer
   ========================================================================== */

#timer {
    font-size: 24px;
    font-weight: bold;
    text-align: center;
    margin: 20px 0;
    color: #007bff;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

/* ==========================================================================
   Results Section
   ========================================================================== */

.results-section {
    margin-top: 30px;
    padding: 20px;
    background-color: #f8f9fa;
    border-radius: 8px;
}

.results-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

.results-table th, .results-table td {
    padding: 8px 12px;
    text-align: left;
    border-bottom: 1px solid #ddd;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

.results-table th {
    background-color: #e9ecef;
    font-weight: bold;
}

.results-table tr:hover {
    background-color: #f1f3f4;
}

.no-results {
    text-align: center;
    color: #6c757d;
    font-style: italic;
    margin-top: 15px;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

.clear-results {
    background-color: #dc3545;
    font-size: 14px;
    padding: 6px 10px;
}

.clear-results:hover {
    background-color: #c82333;
}

/* ==========================================================================
   Headings
   ========================================================================== */

h1, h2, h3 {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
}

/* ==========================================================================
   Global Touch / Selection Prevention
   ========================================================================== */

* {
    -webkit-touch-callout: none;
    -webkit-tap-highlight-color: transparent;
}

/* ==========================================================================
   SEO Content Section
   ========================================================================== */

.seo-content {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    margin-top: 20px;
    line-height: 1.7;
    color: #333;
}

.seo-content h2 {
    color: #333;
    margin-top: 30px;
    margin-bottom: 10px;
    font-size: 22px;
    -webkit-user-select: auto;
    -moz-user-select: auto;
    -ms-user-select: auto;
    user-select: auto;
}

.seo-content h3 {
    color: #555;
    margin-top: 20px;
    margin-bottom: 8px;
    font-size: 18px;
    -webkit-user-select: auto;
    -moz-user-select: auto;
    -ms-user-select: auto;
    user-select: auto;
}

.seo-content p, .seo-content li {
    font-size: 15px;
    color: #555;
    -webkit-user-select: auto;
    -moz-user-select: auto;
    -ms-user-select: auto;
    user-select: auto;
}

.seo-content ul {
    padding-left: 20px;
}

.seo-content li {
    margin-bottom: 6px;
}

.faq-item {
    margin-bottom: 20px;
}

.faq-item h3 {
    margin-bottom: 5px;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
    text-align: center;
    padding: 20px;
    margin-top: 20px;
    color: #999;
    font-size: 13px;
}

.site-footer a {
    color: #007bff;
    text-decoration: none;
}

.site-footer a:hover {
    text-decoration: underline;
}