/* Coffee Shop Theme Styles */
:root {
    --coffee-dark: #3e2723;
    --coffee-medium: #5d4037;
    --coffee-light: #8d6e63;
    --cream: #f5f5dc;
    --foam: #ffffff;
    --espresso: #1a0e0a;
    --accent-green: #4caf50;
    --accent-red: #f44336;
    --accent-yellow: #ffeb3b;
}

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

body {
    font-family: 'Georgia', serif;
    background: linear-gradient(135deg, var(--cream) 0%, #f0e68c 100%);
    color: var(--coffee-dark);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 2400px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.header {
    text-align: center;
    margin-bottom: 40px;
    padding: 30px 20px;
    background: var(--coffee-dark);
    color: var(--cream);
    border-radius: 15px;
    box-shadow: 0 8px 25px rgba(0,0,0,0.2);
}

.logo-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-bottom: 15px;
}

.logo-link {
    text-decoration: none;
    transition: transform 0.3s ease;
}

.logo-link:hover {
    transform: scale(1.1);
}

.logo {
    width: 60px;
    height: 60px;
    filter: drop-shadow(2px 2px 4px rgba(0,0,0,0.3));
}

.title {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.title i {
    margin-right: 15px;
    color: var(--accent-green);
}

.subtitle {
    font-size: 1.2rem;
    opacity: 0.9;
    font-style: italic;
}

.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.hero-section {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.story-box {
    background: var(--foam);
    padding: 25px;
    border-radius: 12px;
    border: 3px solid var(--coffee-medium);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.story-box h2 {
    color: var(--coffee-dark);
    margin-bottom: 15px;
    font-size: 1.8rem;
}

.story-box h2 i {
    color: var(--accent-red);
    margin-right: 10px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
}

.feature-card {
    background: var(--foam);
    padding: 30px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
    border: 2px solid var(--coffee-light);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

.feature-card i {
    font-size: 3rem;
    color: var(--coffee-medium);
    margin-bottom: 15px;
}

.feature-card h3 {
    color: var(--coffee-dark);
    margin-bottom: 10px;
    font-size: 1.4rem;
}

.feature-card p {
    color: var(--coffee-light);
    margin-bottom: 20px;
}

.btn {
    display: inline-block;
    padding: 12px 24px;
    text-decoration: none;
    border-radius: 8px;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.3s ease;
}

.btn-primary {
    background: var(--coffee-medium);
    color: var(--cream);
    border: 2px solid var(--coffee-medium);
}

.btn-primary:hover {
    background: var(--coffee-dark);
    border-color: var(--coffee-dark);
    transform: translateY(-2px);
}

.challenge-info {
    background: var(--foam);
    padding: 30px;
    border-radius: 12px;
    border: 2px solid var(--coffee-light);
}

.challenge-info h2 {
    text-align: center;
    color: var(--coffee-dark);
    margin-bottom: 25px;
    font-size: 2rem;
}

.rules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.rule-item {
    padding: 20px;
    background: linear-gradient(135deg, var(--cream), #faf8f0);
    border-radius: 8px;
    border-left: 4px solid var(--coffee-medium);
}

.rule-item h4 {
    color: var(--coffee-dark);
    margin-bottom: 10px;
    font-size: 1.2rem;
}

.rule-item h4 i {
    margin-right: 8px;
    color: var(--accent-green);
}

.rule-item p {
    color: var(--coffee-light);
}

.footer {
    text-align: center;
    padding: 20px;
    margin-top: 40px;
    color: var(--coffee-light);
    border-top: 2px solid var(--coffee-light);
}

/* Grid Generator Styles */
.grid-generator-section {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 30px;
    margin-bottom: 40px;
}

.controls-panel {
    background: var(--cream);
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    border: 2px solid var(--coffee-light);
}

.controls-panel h2 {
    color: var(--coffee-dark);
    margin-bottom: 20px;
    border-bottom: 2px solid var(--coffee-light);
    padding-bottom: 10px;
}

.controls-panel h3 {
    color: var(--coffee-medium);
    margin: 20px 0 10px 0;
}

.size-buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 25px;
}

.btn-size {
    padding: 12px 20px;
    background: var(--coffee-medium);
    color: var(--cream);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.btn-size:hover {
    background: var(--coffee-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.custom-size {
    border-top: 1px solid var(--coffee-light);
    padding-top: 20px;
}

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

.input-group label {
    display: block;
    margin-bottom: 5px;
    color: var(--coffee-dark);
    font-weight: bold;
}

.input-group input {
    width: 100%;
    padding: 10px;
    border: 2px solid var(--coffee-light);
    border-radius: 5px;
    font-size: 1rem;
}

.input-group input:focus {
    outline: none;
    border-color: var(--coffee-medium);
    box-shadow: 0 0 5px rgba(93, 64, 55, 0.3);
}

.grid-display-section {
    background: var(--foam);
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    border: 2px solid var(--coffee-light);
    min-height: 400px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.grid-container h3 {
    color: var(--coffee-dark);
    margin-bottom: 15px;
    text-align: center;
}

.grid-metadata {
    background: var(--cream);
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    border: 1px solid var(--coffee-light);
}

.grid-metadata pre {
    margin: 0;
    color: var(--coffee-dark);
    font-size: 0.9rem;
}

.grid-display {
    font-family: 'Courier New', monospace;
    font-size: 1.2rem;
    line-height: 1.4;
    background: var(--foam);
    padding: 20px;
    border-radius: 8px;
    border: 2px solid var(--coffee-light);
    margin-bottom: 20px;
    max-height: 400px;
    overflow: auto;
}

.grid-row {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 5px;
}

.grid-cell {
    display: inline-block;
    width: 30px;
    height: 30px;
    text-align: center;
    line-height: 30px;
    background: var(--cream);
    border: 1px solid var(--coffee-light);
    border-radius: 4px;
    font-weight: bold;
    color: var(--coffee-dark);
}

.export-options {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.loading-indicator {
    text-align: center;
    color: var(--coffee-medium);
    font-size: 1.2rem;
}

.loading-indicator i {
    font-size: 2rem;
    display: block;
    margin-bottom: 10px;
}

.error-message {
    background: var(--accent-red);
    color: white;
    padding: 15px;
    border-radius: 8px;
    margin: 20px 0;
    text-align: center;
}

.success-message {
    background: var(--accent-green);
    color: white;
    padding: 15px;
    border-radius: 8px;
    margin: 20px 0;
    text-align: center;
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.instructions {
    background: var(--cream);
    padding: 25px;
    border-radius: 10px;
    margin-top: 30px;
    border: 2px solid var(--coffee-light);
}

.instructions h2 {
    color: var(--coffee-dark);
    margin-bottom: 15px;
}

.instructions ol {
    color: var(--coffee-dark);
    padding-left: 20px;
}

.instructions li {
    margin-bottom: 8px;
}

/* Dictionary Management Styles */
.dictionary-management-section {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 30px;
    margin-bottom: 40px;
}

.category-options {
    margin-bottom: 25px;
}

.category-buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 20px;
}

.btn-category {
    padding: 12px 20px;
    background: var(--coffee-light);
    color: var(--cream);
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
    text-align: left;
}

.btn-category:hover {
    background: var(--coffee-medium);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.btn-category.active {
    background: var(--coffee-dark);
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

.combined-dictionary {
    border-top: 1px solid var(--coffee-light);
    padding-top: 20px;
    margin-bottom: 25px;
}

.combined-dictionary p {
    color: var(--coffee-light);
    font-size: 0.9rem;
    margin-bottom: 15px;
}

.dictionary-display-section {
    background: var(--foam);
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    border: 2px solid var(--coffee-light);
    min-height: 500px;
}

.dictionary-container h3 {
    color: var(--coffee-dark);
    margin-bottom: 15px;
    text-align: center;
    font-size: 1.5rem;
}

.dictionary-metadata {
    background: var(--cream);
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    border: 1px solid var(--coffee-light);
}

.dictionary-metadata pre {
    margin: 0;
    color: var(--coffee-dark);
    font-size: 0.9rem;
}

.dictionary-words {
    background: var(--foam);
    padding: 20px;
    border-radius: 8px;
    border: 2px solid var(--coffee-light);
    margin-bottom: 20px;
    max-height: 400px;
    overflow-y: auto;
}

.words-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 8px;
    justify-items: center;
}

.word-item {
    background: var(--cream);
    padding: 8px 12px;
    border-radius: 6px;
    border: 1px solid var(--coffee-light);
    font-family: 'Courier New', monospace;
    font-weight: bold;
    color: var(--coffee-dark);
    font-size: 0.9rem;
    text-align: center;
    min-width: 80px;
    transition: all 0.2s ease;
}

.word-item:hover {
    background: var(--coffee-light);
    color: var(--cream);
    transform: scale(1.05);
}

.category-descriptions {
    background: var(--cream);
    padding: 20px;
    border-radius: 8px;
    margin-top: 20px;
    border: 1px solid var(--coffee-light);
}

.category-descriptions h3 {
    color: var(--coffee-dark);
    margin-bottom: 15px;
}

.category-desc {
    margin-bottom: 10px;
    color: var(--coffee-dark);
    font-size: 0.95rem;
}

.category-desc strong {
    color: var(--coffee-medium);
}

.btn-secondary {
    background: var(--coffee-light);
    color: var(--cream);
    border: 2px solid var(--coffee-light);
}

.btn-secondary:hover {
    background: var(--coffee-medium);
    border-color: var(--coffee-medium);
    transform: translateY(-2px);
}

.btn-secondary:disabled {
    background: #ccc;
    color: #666;
    border-color: #ccc;
    cursor: not-allowed;
    transform: none;
}

.btn-secondary:disabled:hover {
    background: #ccc;
    border-color: #ccc;
    transform: none;
}

.button-group {
    display: flex;
    gap: 10px;
    margin-top: 10px;
    flex-wrap: wrap;
}

.button-group .btn {
    flex: 1;
    min-width: 150px;
}

@media (max-width: 768px) {
    .title {
        font-size: 2rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .rules-grid {
        grid-template-columns: 1fr;
    }
    
    .container {
        padding: 10px;
    }
    
    .grid-generator-section {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .dictionary-management-section {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .size-buttons {
        flex-direction: column;
    }
    
    .export-options {
        flex-direction: column;
        align-items: center;
    }
    
    .grid-cell {
        width: 25px;
        height: 25px;
        line-height: 25px;
        font-size: 0.9rem;
    }
    
    .words-grid {
        grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
        gap: 6px;
    }
    
    .word-item {
        font-size: 0.8rem;
        padding: 6px 8px;
        min-width: 70px;
    }
}

/* Solution Validation Styles */
.solution-validation-section {
    display: flex;
    flex-direction: column;
    gap: 30px;
    margin-bottom: 40px;
}

.input-section {
    background: var(--foam);
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    border: 2px solid var(--coffee-light);
}

.input-section h2 {
    color: var(--coffee-dark);
    margin-bottom: 20px;
    text-align: center;
}

.input-section h3 {
    color: var(--coffee-medium);
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.grid-input,
.dictionary-selection,
.solution-input {
    margin-bottom: 25px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--coffee-light);
}

.grid-input:last-child,
.dictionary-selection:last-child,
.solution-input:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.input-methods {
    display: flex;
    gap: 10px;
    align-items: center;
    margin-bottom: 15px;
    flex-wrap: wrap;
}

.grid-input textarea,
.solution-input textarea {
    width: 100%;
    padding: 15px;
    border: 2px solid var(--coffee-light);
    border-radius: 8px;
    background: var(--cream);
    color: var(--coffee-dark);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    resize: vertical;
    min-height: 150px;
}

.grid-input textarea:focus,
.solution-input textarea:focus {
    outline: none;
    border-color: var(--coffee-medium);
    box-shadow: 0 0 10px rgba(93, 64, 55, 0.3);
}

.dictionary-selection select,
.input-methods select {
    padding: 10px 15px;
    border: 2px solid var(--coffee-light);
    border-radius: 8px;
    background: var(--cream);
    color: var(--coffee-dark);
    font-size: 1rem;
    cursor: pointer;
}

.dictionary-selection select:focus,
.input-methods select:focus {
    outline: none;
    border-color: var(--coffee-medium);
}

/* Tab Navigation */
.tab-navigation {
    display: flex;
    gap: 5px;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--coffee-light);
}

.tab-btn {
    padding: 12px 20px;
    background: var(--cream);
    color: var(--coffee-dark);
    border: none;
    border-radius: 8px 8px 0 0;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
    border-bottom: 3px solid transparent;
}

.tab-btn:hover {
    background: var(--coffee-light);
    color: var(--cream);
}

.tab-btn.active {
    background: var(--coffee-medium);
    color: var(--cream);
    border-bottom-color: var(--coffee-dark);
}

.tab-content {
    display: none;
    padding: 20px 0;
}

.tab-content.active {
    display: block;
}

/* File Upload */
.file-upload-area {
    margin-bottom: 15px;
}

.file-drop-area {
    border: 3px dashed var(--coffee-light);
    border-radius: 10px;
    padding: 40px 20px;
    text-align: center;
    background: var(--cream);
    cursor: pointer;
    transition: all 0.3s ease;
    color: var(--coffee-dark);
}

.file-drop-area:hover,
.file-drop-area.drag-over {
    border-color: var(--coffee-medium);
    background: var(--foam);
    transform: scale(1.02);
}

.file-drop-area i {
    color: var(--coffee-light);
    margin-bottom: 15px;
}

.file-drop-area p {
    margin-bottom: 15px;
    color: var(--coffee-medium);
}

.file-info {
    background: var(--cream);
    padding: 15px;
    border-radius: 8px;
    border: 1px solid var(--coffee-light);
    margin-bottom: 15px;
}

.file-details {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--coffee-dark);
}

.file-name {
    font-weight: bold;
}

.file-size {
    color: var(--coffee-light);
    font-size: 0.9rem;
}

/* Results Section */
.results-section {
    background: var(--foam);
    padding: 25px;
    border-radius: 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    border: 2px solid var(--coffee-light);
}

.results-section h2 {
    color: var(--coffee-dark);
    margin-bottom: 25px;
    text-align: center;
}

.results-section h3 {
    color: var(--coffee-medium);
    margin-bottom: 15px;
}

/* Statistics Panel */
.statistics-panel {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 15px;
    margin-bottom: 30px;
}

.stat-card {
    background: var(--cream);
    padding: 20px;
    border-radius: 10px;
    border: 2px solid var(--coffee-light);
    display: flex;
    align-items: center;
    gap: 15px;
    transition: all 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0,0,0,0.15);
}

.stat-card.accuracy {
    border-color: var(--accent-green);
}

.stat-card.completeness {
    border-color: #2196f3;
}

.stat-card.correct {
    border-color: var(--accent-green);
}

.stat-card.incorrect {
    border-color: var(--accent-red);
}

.stat-card.missed {
    border-color: var(--accent-yellow);
}

.stat-icon {
    font-size: 2rem;
    color: var(--coffee-medium);
}

.stat-card.accuracy .stat-icon {
    color: var(--accent-green);
}

.stat-card.completeness .stat-icon {
    color: #2196f3;
}

.stat-card.correct .stat-icon {
    color: var(--accent-green);
}

.stat-card.incorrect .stat-icon {
    color: var(--accent-red);
}

.stat-card.missed .stat-icon {
    color: #f57f17;
}

.stat-value {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--coffee-dark);
}

.stat-label {
    font-size: 0.9rem;
    color: var(--coffee-light);
}

/* Visual Grid */
/* Grid and Solution Visualization */
.visual-grid-section {
    margin-bottom: 30px;
    /* Allow horizontal overflow for very large grids */
    overflow-x: auto;
}

.grid-wrapper {
    position: relative;
    display: inline-block;
}

.solution-lines-overlay {
    position: absolute;
    top: 0;
    left: 0;
    pointer-events: none;
    z-index: 1;
}

.solution-line {
    stroke-width: 3;
    stroke-opacity: 0.6;
    fill: none;
    stroke-linecap: round;
}

.solution-line.correct-line {
    stroke: var(--coffee-medium);
}

.solution-line.incorrect-line {
    stroke: var(--coffee-medium);
}

.solution-line.missed-line {
    stroke: var(--coffee-medium);
}

.grid-legend {
    display: flex;
    gap: 20px;
    margin-bottom: 15px;
    flex-wrap: wrap;
    justify-content: center;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 15px;
    border-radius: 6px;
    background: var(--cream);
    border: 1px solid var(--coffee-light);
    font-size: 0.9rem;
    color: var(--coffee-dark);
}

.legend-color {
    width: 16px;
    height: 16px;
    border-radius: 3px;
    border: 1px solid rgba(0,0,0,0.2);
}

.legend-item.correct .legend-color {
    background: var(--accent-green);
}

.legend-item.incorrect .legend-color {
    background: var(--accent-red);
}

.legend-item.missed .legend-color {
    background: var(--accent-yellow);
}

.visual-grid {
    display: flex;
    justify-content: center;
    overflow-x: auto;
    padding: 20px;
    background: var(--cream);
    border-radius: 8px;
    border: 1px solid var(--coffee-light);
    /* Allow horizontal expansion for very large grids */
    min-width: 0;
    width: max-content;
    max-width: 100vw;
}

.grid-table {
    border-collapse: collapse;
    font-family: 'Courier New', monospace;
    font-weight: bold;
}

.grid-cell {
    width: 35px;
    height: 35px;
    line-height: 35px;
    text-align: center;
    border: 1px solid var(--coffee-light);
    background: var(--foam);
    color: var(--coffee-dark);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.grid-cell:hover {
    background: var(--cream);
    transform: scale(1.1);
    z-index: 10;
    position: relative;
}

.grid-cell.correct-solution {
    background: var(--accent-green);
    color: white;
    box-shadow: inset 0 0 0 2px rgba(255,255,255,0.5);
}

.grid-cell.incorrect-solution {
    background: var(--accent-red);
    color: white;
    box-shadow: inset 0 0 0 2px rgba(255,255,255,0.5);
}

.grid-cell.missed-solution {
    background: var(--accent-yellow);
    color: var(--coffee-dark);
    box-shadow: inset 0 0 0 2px rgba(0,0,0,0.3);
}

/* Challenge Breakdown */
.challenge-breakdown {
    margin-bottom: 30px;
}

.challenge-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 15px;
}

.challenge-stat-item {
    background: var(--cream);
    padding: 15px;
    border-radius: 8px;
    border: 1px solid var(--coffee-light);
    text-align: center;
}

.challenge-level {
    font-weight: bold;
    color: var(--coffee-dark);
    margin-bottom: 5px;
}

.challenge-count {
    color: var(--coffee-medium);
    font-size: 1.1rem;
}

/* Detailed Results */
.detailed-results {
    background: var(--cream);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--coffee-light);
}

.result-tabs {
    display: flex;
    gap: 5px;
    margin-bottom: 20px;
    border-bottom: 2px solid var(--coffee-light);
    flex-wrap: wrap;
}

.result-tab-btn {
    padding: 10px 15px;
    background: var(--foam);
    color: var(--coffee-dark);
    border: none;
    border-radius: 6px 6px 0 0;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s ease;
    border-bottom: 3px solid transparent;
    white-space: nowrap;
}

.result-tab-btn:hover {
    background: var(--coffee-light);
    color: var(--cream);
}

.result-tab-btn.active {
    background: var(--coffee-medium);
    color: var(--cream);
    border-bottom-color: var(--coffee-dark);
}

.result-tab-content {
    display: none;
}

.result-tab-content.active {
    display: block;
}

.solution-list {
    max-height: 300px;
    overflow-y: auto;
}

.solution-item {
    background: var(--foam);
    padding: 12px;
    border-radius: 6px;
    border: 1px solid var(--coffee-light);
    margin-bottom: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.solution-word {
    font-weight: bold;
    color: var(--coffee-dark);
    font-family: 'Courier New', monospace;
    font-size: 1.1rem;
}

.solution-coords {
    color: var(--coffee-medium);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
}

.solution-direction {
    color: var(--coffee-light);
    font-size: 0.8rem;
    font-style: italic;
}

.no-solutions {
    text-align: center;
    color: var(--coffee-light);
    font-style: italic;
    padding: 20px;
}

#validationReport {
    background: var(--foam);
    padding: 20px;
    border-radius: 6px;
    border: 1px solid var(--coffee-light);
    color: var(--coffee-dark);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    margin-bottom: 15px;
    white-space: pre-wrap;
    max-height: 400px;
    overflow-y: auto;
}

/* Format Info */
.format-info {
    background: var(--cream);
    padding: 20px;
    border-radius: 8px;
    margin-top: 20px;
    border: 1px solid var(--coffee-light);
}

.format-info h3 {
    color: var(--coffee-dark);
    margin-bottom: 15px;
}

.format-info code {
    background: var(--foam);
    padding: 2px 6px;
    border-radius: 3px;
    color: var(--coffee-dark);
    font-family: 'Courier New', monospace;
}

.format-info pre {
    background: var(--foam);
    padding: 15px;
    border-radius: 6px;
    border: 1px solid var(--coffee-light);
    color: var(--coffee-dark);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    margin: 10px 0;
    overflow-x: auto;
}

/* Responsive Design for Solution Validation */
@media (max-width: 768px) {
    .statistics-panel {
        grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
        gap: 10px;
    }
    
    .stat-card {
        padding: 15px;
        flex-direction: column;
        text-align: center;
        gap: 8px;
    }
    
    .stat-icon {
        font-size: 1.5rem;
    }
    
    .stat-value {
        font-size: 1.4rem;
    }
    
    .grid-legend {
        flex-direction: column;
        align-items: center;
    }
    
    .grid-cell {
        width: 25px;
        height: 25px;
        line-height: 25px;
        font-size: 0.8rem;
    }
    
    .result-tabs {
        flex-direction: column;
    }
    
    .result-tab-btn {
        border-radius: 6px;
        border-bottom: none;
        border-left: 3px solid transparent;
    }
    
    .result-tab-btn.active {
        border-left-color: var(--coffee-dark);
        border-bottom: none;
    }
    
    .solution-item {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .input-methods {
        flex-direction: column;
        align-items: stretch;
    }
    
    .tab-navigation {
        flex-direction: column;
    }
    
    .tab-btn {
        border-radius: 6px;
        border-bottom: none;
        border-left: 3px solid transparent;
    }
    
    .tab-btn.active {
        border-left-color: var(--coffee-dark);
        border-bottom: none;
    }
}

/* Enhanced Grid Features */
.grid-container-with-coords {
    display: inline-block;
    font-family: 'Courier New', monospace;
}

.grid-header-row {
    display: flex;
    margin-bottom: 2px;
}

.grid-coord-header {
    width: 35px;
    height: 25px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--coffee-light);
    color: var(--cream);
    font-size: 0.8rem;
    font-weight: bold;
    border: 1px solid var(--coffee-medium);
    margin-right: 0px;
}

.grid-row-header {
    width: 35px !important;
    height: 35px !important;
    background: var(--coffee-light) !important;
    color: var(--cream) !important;
    text-align: center !important;
    vertical-align: middle !important;
    font-weight: bold !important;
    font-size: 0.8rem !important;
    border: 1px solid var(--coffee-medium) !important;
}

/* Enhanced Grid Cell Features */
.grid-cell.zoomed {
    transform: scale(1.5);
    z-index: 100;
    position: relative;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
    border: 3px solid var(--coffee-dark);
}

.grid-cell.hidden-solution {
    background: var(--foam) !important;
    color: var(--coffee-dark) !important;
    box-shadow: none !important;
}

.grid-cell.visible-solution {
    /* Maintain existing solution highlighting */
}

/* Solution Toggle Controls */
.solution-toggle-controls {
    background: var(--cream);
    padding: 15px;
    border-radius: 8px;
    border: 1px solid var(--coffee-light);
    margin: 15px 0;
}

.solution-toggle-controls h4 {
    color: var(--coffee-dark);
    margin: 0 0 10px 0;
    font-size: 1rem;
}

.toggle-switches {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.toggle-switch-container {
    display: flex;
    align-items: center;
    gap: 10px;
}

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 25px;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 25px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 19px;
    width: 19px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--accent-green);
}

input:checked + .slider.accent-red {
    background-color: var(--accent-red);
}

input:checked + .slider.accent-yellow {
    background-color: var(--accent-yellow);
}

input:checked + .slider:before {
    transform: translateX(25px);
}

.toggle-label {
    color: var(--coffee-dark);
    font-size: 0.9rem;
    white-space: nowrap;
}

/* Direction Toggle Controls */
.direction-toggle-controls {
    background: var(--cream);
    padding: 15px;
    border-radius: 8px;
    border: 1px solid var(--coffee-light);
    margin: 15px 0;
}

.direction-toggle-controls h4 {
    color: var(--coffee-dark);
    margin: 0 0 10px 0;
    font-size: 1rem;
}

.direction-toggles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 8px;
}

.direction-toggle-container {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--foam);
    padding: 6px 10px;
    border-radius: 6px;
    border: 1px solid var(--coffee-light);
    font-size: 0.85rem;
}

.direction-icon {
    font-size: 1.1rem;
    font-weight: bold;
    color: var(--coffee-medium);
    min-width: 18px;
    text-align: center;
}

.direction-toggle-switch {
    position: relative;
    display: inline-block;
    width: 35px;
    height: 18px;
}

.direction-toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.direction-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 18px;
}

.direction-slider:before {
    position: absolute;
    content: "";
    height: 14px;
    width: 14px;
    left: 2px;
    bottom: 2px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .direction-slider {
    background-color: var(--coffee-medium);
}

input:checked + .direction-slider:before {
    transform: translateX(17px);
}

.direction-label {
    color: var(--coffee-dark);
    font-size: 0.8rem;
    white-space: nowrap;
    user-select: none;
}

/* Cell visibility states */
.grid-cell.hidden-by-filter {
    opacity: 0.3;
}

/* Cell Info Popup */
.cell-info-popup {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--coffee-dark);
    color: var(--cream);
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
    z-index: 1000;
    font-size: 0.9rem;
    min-width: 150px;
}

/* Enhanced Hover Effects */
.grid-cell:hover::before {
    content: attr(data-col) ',' attr(data-row);
    position: absolute;
    bottom: -25px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--coffee-dark);
    color: var(--cream);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.7rem;
    white-space: nowrap;
    z-index: 10;
}

/* Responsive Enhancements */
@media (max-width: 768px) {
    .toggle-switches {
        flex-direction: column;
        gap: 10px;
    }
    
    .grid-coord-header {
        width: 30px;
        font-size: 0.7rem;
    }
    
    .grid-row-header {
        width: 30px !important;
        height: 30px !important;
        font-size: 0.7rem !important;
    }
    
    .grid-cell {
        width: 30px;
        height: 30px;
        line-height: 30px;
        font-size: 0.9rem;
    }
    
    .cell-info-popup {
        position: fixed;
        top: 10px;
        left: 10px;
        right: 10px;
        max-width: none;
    }
}