/* Game tool shell (shared layout with theme) */
.game-tool {
    max-width: 1100px;
    margin: 0 auto;
}

.game-tool.editor-section,
.editor-section.game-tool {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.game-tool .card {
    border: 1px solid var(--color-border, #e5e7eb);
    box-shadow: var(--shadow-sm, 0 1px 3px rgba(0, 0, 0, 0.06));
    border-radius: var(--radius, 12px);
    background: var(--color-surface, #fff);
}

.game-tool .card-body {
    padding: 1.25rem 1.35rem;
}

.game-tool .card-title {
    color: var(--color-text, #1f2937);
    font-weight: 700;
    font-size: 1.05rem;
}

.game-tool .form-control,
.game-tool .form-select,
.game-tool .select-input,
.game-tool textarea {
    border-radius: 8px;
    border: 1px solid var(--color-border, #e5e7eb);
}

.game-tool .form-control:focus,
.game-tool .form-select:focus,
.game-tool textarea:focus {
    border-color: var(--color-primary, #0d9488);
    box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.15);
}

.game-tool .btn-primary {
    background: var(--color-primary, #0d9488);
    border-color: var(--color-primary, #0d9488);
}

.game-tool .btn-primary:hover {
    background: var(--color-primary-hover, #0f766e);
    border-color: var(--color-primary-hover, #0f766e);
}

.game-tool .alert {
    border-radius: 10px;
}

[data-theme="dark"] .game-tool .card {
    background: var(--color-surface, #1f2937);
    border-color: var(--color-border, #374151);
}

[data-theme="dark"] .game-tool .card-title,
[data-theme="dark"] .game-tool .form-label,
[data-theme="dark"] .game-tool {
    color: var(--color-text, #f9fafb);
}

[data-theme="dark"] .game-tool .text-muted,
[data-theme="dark"] .game-tool .form-text {
    color: var(--color-text-secondary, #9ca3af) !important;
}

[data-theme="dark"] .game-tool .form-control,
[data-theme="dark"] .game-tool .form-select,
[data-theme="dark"] .game-tool textarea {
    background: #111827;
    color: var(--color-text, #f9fafb);
    border-color: var(--color-border, #374151);
}

/* --- tool: sudoku-game --- */
.sudoku-game-tool {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.control-panel {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 1.5rem;
    border-radius: 15px;
    color: white;
}

.control-panel .form-floating label {
    color: rgba(255, 255, 255, 0.8);
}

.control-panel .form-select {
    background-color: rgba(255, 255, 255, 0.9);
    border: none;
    border-radius: 10px;
}

.info-card {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: white;
    padding: 1rem;
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.info-value {
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
}

.info-label {
    font-size: 0.9rem;
    opacity: 0.9;
}

.sudoku-container {
    background: white;
    padding: 2rem;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.sudoku-grid {
    display: inline-grid;
    gap: 1px;
    background: #333;
    padding: 2px;
    border-radius: 10px;
}

.sudoku-grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

.sudoku-grid-6 {
    grid-template-columns: repeat(6, 1fr);
}

.sudoku-grid-9 {
    grid-template-columns: repeat(9, 1fr);
}

.sudoku-cell {
    width: 50px;
    height: 50px;
    background: white;
    border: none;
    font-size: 1.2rem;
    font-weight: bold;
    text-align: center;
    cursor: pointer;
    transition: background-color 0.2s ease;
    position: relative;
}

.sudoku-grid-6 .sudoku-cell {
    width: 45px;
    height: 45px;
    font-size: 1.1rem;
}

.sudoku-grid-9 .sudoku-cell {
    width: 40px;
    height: 40px;
    font-size: 1rem;
}

.sudoku-cell:hover {
    background: #e3f2fd;
}

.sudoku-cell:focus {
    background: #bbdefb;
    outline: none;
    box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.3);
}

.sudoku-cell.original {
    background: #f5f5f5;
    color: #333;
    cursor: not-allowed;
}

.sudoku-cell.original:hover {
    background: #f5f5f5;
}

.sudoku-cell.error {
    background: #ffebee;
    color: #c62828;
}

.sudoku-cell.correct {
    background: #e8f5e8;
    color: #2e7d32;
}

.sudoku-cell.highlighted {
    background: #fff3e0;
    border: 2px solid #ff9800;
}

.sudoku-cell.selected {
    background: #e3f2fd;
    border: 2px solid #2196f3;
}

/* 宫格边框 */
.sudoku-grid-4 .sudoku-cell:nth-child(2n) {
    border-right: 2px solid #333;
}

.sudoku-grid-4 .sudoku-cell:nth-child(n+9):nth-child(-n+16) {
    border-bottom: 2px solid #333;
}

.sudoku-grid-6 .sudoku-cell:nth-child(3n) {
    border-right: 2px solid #333;
}

.sudoku-grid-6 .sudoku-cell:nth-child(n+19):nth-child(-n+36) {
    border-bottom: 2px solid #333;
}

.sudoku-grid-9 .sudoku-cell:nth-child(3n) {
    border-right: 2px solid #333;
}

.sudoku-grid-9 .sudoku-cell:nth-child(n+28):nth-child(-n+54) {
    border-bottom: 2px solid #333;
}

.sudoku-grid-9 .sudoku-cell:nth-child(n+55):nth-child(-n+81) {
    border-bottom: 2px solid #333;
}

.number-panel {
    margin-top: 1.5rem;
}

.number-buttons {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.number-btn {
    width: 45px;
    height: 45px;
    border: 2px solid #ddd;
    background: white;
    border-radius: 50%;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.number-btn:hover {
    background: #e3f2fd;
    border-color: #2196f3;
    transform: scale(1.05);
}

.number-btn.active {
    background: #2196f3;
    color: white;
    border-color: #2196f3;
}

.action-buttons .btn {
    padding: 0.75rem 1.5rem;
    border-radius: 25px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.action-buttons .btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.15);
}

.game-result {
    background: white;
    padding: 2rem;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.result-stats {
    margin-top: 1.5rem;
}

.result-item {
    padding: 1rem;
}

.result-value {
    font-size: 2rem;
    font-weight: bold;
    color: #2196f3;
    margin-bottom: 0.5rem;
}

.result-label {
    font-size: 0.9rem;
    color: #666;
}

.sudoku-info .alert {
    border-radius: 15px;
    border: none;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .sudoku-cell {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
    
    .sudoku-grid-6 .sudoku-cell {
        width: 35px;
        height: 35px;
        font-size: 0.9rem;
    }
    
    .sudoku-grid-9 .sudoku-cell {
        width: 30px;
        height: 30px;
        font-size: 0.8rem;
    }
    
    .number-btn {
        width: 35px;
        height: 35px;
        font-size: 0.9rem;
    }
}