/* Sudoku Solver & Player - Complete Styling */

.sudoku-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
}

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

.sudoku-header h2 {
    font-size: 28px;
    color: #333;
    margin-bottom: 10px;
}

.sudoku-header p {
    color: #666;
    font-size: 16px;
}

.sudoku-body {
    background: white;
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.1);
}

/* Controls */
.sudoku-controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.control-group label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
    color: #333;
    font-size: 14px;
}

.control-icon {
    font-size: 18px;
}

.control-group select {
    padding: 10px 15px;
    border: 2px solid #e5e7eb;
    border-radius: 10px;
    font-size: 14px;
    background: white;
    cursor: pointer;
    transition: border-color 0.3s;
}

.control-group select:focus {
    outline: none;
    border-color: #3b82f6;
}

.control-buttons {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    grid-column: 1 / -1;
}

.control-btn {
    padding: 12px 20px;
    border: 2px solid #e5e7eb;
    border-radius: 10px;
    background: white;
    color: #333;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.control-btn:hover {
    background: #f3f4f6;
    border-color: #3b82f6;
    transform: translateY(-2px);
}

.control-btn span {
    font-size: 18px;
}

/* Game Stats */
.game-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    margin-bottom: 25px;
    max-width: 500px;
    margin: auto;
    margin-bottom: 10px;
}

.stat-item {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    padding: 15px;
    border-radius: 12px;
    text-align: center;
}

.stat-label {
    display: block;
    font-size: 14px;
    color: #64748b;
    margin-bottom: 5px;
}

.stat-value {
    display: block;
    font-size: 20px;
    font-weight: 700;
    color: #1e40af;
}

/* Sudoku Grid */
.sudoku-grid {
    display: grid;
    grid-template-columns: repeat(9, 1fr);
    gap: 0;
    max-width: 500px;
    margin: 0 auto 25px;
    background: #1e293b;
    padding: 2px;
    border-radius: 0px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.sudoku-cell {
    aspect-ratio: 1;
    background: white;
    border: 1px solid #cbd5e1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    position: relative;
}

.sudoku-cell:hover:not(.given):not(.solved) {
    background: #f0f9ff;
}

.sudoku-cell.selected {
    background: #dbeafe !important;
    border: 2px solid #3b82f6 !important;
    z-index: 10;
}

.sudoku-cell.given {
    background: #f1f5f9;
    color: #1e293b;
    font-weight: 700;
    cursor: default;
}

.sudoku-cell.user-input {
    color: #3b82f6;
}

.sudoku-cell.error {
    background: #fee2e2 !important;
    color: #dc2626 !important;
}

.sudoku-cell.hint {
    background: #fef3c7 !important;
    color: #d97706 !important;
    animation: hintPulse 0.5s ease;
}

.sudoku-cell.solved {
    background: #dcfce7 !important;
    color: #16a34a !important;
}

/* Box borders */
.sudoku-cell:nth-child(9n+3),
.sudoku-cell:nth-child(9n+6) {
    border-right: 3px solid #1e293b;
}

.sudoku-cell:nth-child(n+19):nth-child(-n+27),
.sudoku-cell:nth-child(n+46):nth-child(-n+54) {
    border-bottom: 3px solid #1e293b;
}

@keyframes hintPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

/* Number Pad */
.number-pad {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 10px;
    margin-bottom: 20px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.num-btn {
    aspect-ratio: 1;
    background: linear-gradient(135deg, #60a5fa 0%, #3b82f6 100%);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 20px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 10px rgba(59, 130, 246, 0.3);
}

.num-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 15px rgba(59, 130, 246, 0.4);
}

.num-btn:active {
    transform: translateY(0);
}

.erase-btn {
    background: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    box-shadow: 0 4px 10px rgba(239, 68, 68, 0.3);
    font-size: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 5px;
}

.erase-btn:hover {
    box-shadow: 0 6px 15px rgba(239, 68, 68, 0.4);
}

/* Game Options */
.game-options {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
    margin-bottom: 25px;
    padding: 15px;
    background: #f8fafc;
    border-radius: 10px;
}

.option-item {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 14px;
    color: #475569;
}

.option-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

/* Keyboard Shortcuts */
.keyboard-shortcuts {
    background: linear-gradient(135deg, #f0fdf4 0%, #dcfce7 100%);
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 20px;
}

.keyboard-shortcuts h4 {
    color: #166534;
    margin-bottom: 15px;
    font-size: 16px;
}

.shortcuts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 12px;
}

.shortcut-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: #166534;
}

kbd {
    background: white;
    border: 2px solid #86efac;
    border-radius: 6px;
    padding: 4px 8px;
    font-family: monospace;
    font-size: 12px;
    font-weight: 600;
    color: #166534;
}

/* Info Box */
.sudoku-info-box {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    padding: 20px;
    border-radius: 12px;
}

.sudoku-info-box h4 {
    color: #92400e;
    margin-bottom: 15px;
    font-size: 16px;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

.info-item {
    background: white;
    padding: 15px;
    border-radius: 10px;
    font-size: 13px;
    color: #78350f;
    line-height: 1.6;
}

.info-item strong {
    display: block;
    color: #92400e;
    margin-bottom: 5px;
    font-size: 14px;
}

/* Responsive */
@media (max-width: 768px) {
    .sudoku-body {
        padding: 20px 15px;
    }
    
    .game-stats {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .sudoku-cell {
        font-size: 18px;
    }
    
    .number-pad {
        grid-template-columns: repeat(5, 1fr);
        gap: 8px;
    }
    
    .num-btn {
        font-size: 18px;
    }
    
    .control-buttons {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .sudoku-grid {
        max-width: 95%;
    }
    
    .sudoku-cell {
        font-size: 16px;
    }
    
    .num-btn {
        font-size: 16px;
    }
    
    .shortcuts-grid {
        grid-template-columns: 1fr;
    }
}









.info-grid {
	grid-template-columns: repeat(4, 1fr);
	gap: 15px;
}
.control-buttons {
	grid-template-columns: repeat(4, 1fr);
}
.number-pad {
    grid-template-columns: repeat(10, 1fr);
    gap: 10px;
    max-width: 1000px;
}

@media (max-width:480px){
	.tool-header h1 {
		font-size: 32px;
	}
	.tool-icon-large {
		font-size: 42px;
	}
	p.tool-subtitle {
		font-size: 16px;
	}
	.sudoku-controls {
		grid-template-columns: repeat(2, 1fr);
		display: grid;
	}
	.control-buttons {
		grid-template-columns: repeat(2, 1fr);
	}
	.game-stats {
        gap: 5px;
        grid-template-columns: repeat(3, 1fr);
    }
	.number-pad {
        grid-template-columns: repeat(5, 1fr);
        gap: 5px;
    }
	.num-btn {
        padding: 0px;
        line-height: 0px;
        font-size: 12px;
    }
	.info-grid {
		grid-template-columns: repeat(2, 1fr);
		gap: 5px;
	}
}

@media (max-width:767px) and (min-width:481px) {
	.tool-header h1 {
		font-size: 32px;
	}
	.tool-icon-large {
		font-size: 42px;
	}
	p.tool-subtitle {
		font-size: 16px;
	}
	.sudoku-controls {
		grid-template-columns: repeat(2, 1fr);
		display: grid;
	}
	.control-buttons {
        grid-template-columns: repeat(4, 1fr);
    }
	.game-stats {
        gap: 5px;
        grid-template-columns: repeat(3, 1fr);
    }
	.number-pad {
        grid-template-columns: repeat(10, 1fr);
        gap: 5px;
        margin: auto;
        max-width: 500px;
    }
	.num-btn {
        padding: 0px;
        line-height: 0px;
        font-size: 10px;
    }
	.info-grid {
		grid-template-columns: repeat(4, 1fr);
		gap: 5px;
	}
	
}

@media (max-width:1024px) and (min-width:768px) {
	.sudoku-controls {
		grid-template-columns: repeat(2, 1fr);
		display: grid;
	}
	.control-buttons {
        grid-template-columns: repeat(4, 1fr);
    }
	.game-stats {
        gap: 5px;
        grid-template-columns: repeat(3, 1fr);
    }
	.number-pad {
        grid-template-columns: repeat(10, 1fr);
        gap: 5px;
        margin: auto;
        max-width: 600px;
    }
	.num-btn {
        padding: 0px;
        line-height: 0px;
        font-size: 10px;
    }
	.info-grid {
		grid-template-columns: repeat(4, 1fr);
		gap: 5px;
	}
}
@media (max-width:1280px) and (min-width:1024px) {
	.info-grid {
		grid-template-columns: repeat(4, 1fr);
		gap: 8px;
	}	
	.number-pad {
        grid-template-columns: repeat(10, 1fr);
        gap: 5px;
        margin: auto;
        max-width: 700px;
    }
	.num-btn {
        padding: 0px;
        line-height: 0px;
        font-size: 14px;
    }
}
@media (min-width:1280px) and (max-width:1400px) {
	.info-grid {
		grid-template-columns: repeat(4, 1fr);
		gap: 15px;
	}	
}


html {
    scroll-behavior: smooth;
}