/* Sudoku Game Styles */

.sudoku-main {
    padding: 120px 0 80px;
    background: #faf8ef;
    min-height: 100vh;
}

.page-title {
    text-align: center;
    font-size: 2.5rem;
    color: #776e65;
    margin-bottom: 1rem;
    font-weight: 700;
}

.page-description {
    text-align: center;
    font-size: 1.1rem;
    color: #8f7a66;
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Game Controls */
.game-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.difficulty-selector {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.difficulty-selector label {
    font-weight: 600;
    color: #776e65;
}

.difficulty-selector select {
    padding: 10px 15px;
    border: 2px solid #8f7a66;
    border-radius: 6px;
    background: white;
    color: #776e65;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
}

/* Game Info */
.game-info {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.info-item {
    background: white;
    padding: 1rem 1.5rem;
    border-radius: 8px;
    text-align: center;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
    min-width: 100px;
}

.info-label {
    display: block;
    font-size: 0.9rem;
    color: #8f7a66;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.5rem;
}

.info-value {
    display: block;
    font-size: 1.2rem;
    font-weight: 700;
    color: #776e65;
}

/* Sudoku Container */
.sudoku-container {
    display: flex;
    justify-content: center;
    margin-bottom: 2rem;
}

.sudoku-grid {
    display: grid;
    grid-template-columns: repeat(9, 1fr);
    gap: 2px;
    background: #8f7a66;
    padding: 8px;
    border-radius: 8px;
    width: 450px;
    height: 450px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.sudoku-cell {
    background: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: #776e65;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    border-radius: 2px;
}

.sudoku-cell:hover {
    background: #f0f8ff;
}

.sudoku-cell.selected {
    background: #e6f3ff !important;
    box-shadow: inset 0 0 0 3px #4a90e2;
}

.sudoku-cell.given {
    background: #f5f5f5;
    color: #333;
    font-weight: 800;
    cursor: default;
}

.sudoku-cell.error {
    background: #ffebee;
    color: #d32f2f;
}

.sudoku-cell.highlight-row,
.sudoku-cell.highlight-col,
.sudoku-cell.highlight-box {
    background: #f0f4f8;
}

.sudoku-cell.same-number {
    background: #e8f5e8;
    color: #2e7d2e;
}

/* 3x3 Box Borders */
.sudoku-cell:nth-child(3n) {
    border-right: 3px solid #8f7a66;
}

.sudoku-cell:nth-child(n+19):nth-child(-n+27),
.sudoku-cell:nth-child(n+46):nth-child(-n+54) {
    border-bottom: 3px solid #8f7a66;
}

/* Notes in cells */
.sudoku-cell .notes {
    position: absolute;
    top: 2px;
    left: 2px;
    font-size: 0.6rem;
    color: #999;
    line-height: 1;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    width: calc(100% - 4px);
    height: calc(100% - 4px);
}

.sudoku-cell .notes span {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Game Actions */
.game-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.action-btn {
    background: white;
    border: 2px solid #8f7a66;
    padding: 12px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    color: #776e65;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    min-width: 80px;
    justify-content: center;
}

.action-btn:hover {
    background: #8f7a66;
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(143, 122, 102, 0.3);
}

.action-btn.active {
    background: #8f7a66;
    color: white;
}

.action-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn-icon {
    font-size: 1.2rem;
}

.btn-text {
    font-size: 0.9rem;
}

/* Number Keypad */
.number-keypad {
    display: grid;
    grid-template-columns: repeat(9, 1fr);
    gap: 8px;
    max-width: 450px;
    margin: 0 auto 3rem;
}

.number-btn {
    background: white;
    border: 2px solid #8f7a66;
    padding: 15px;
    border-radius: 8px;
    font-size: 1.5rem;
    font-weight: 700;
    color: #776e65;
    cursor: pointer;
    transition: all 0.2s ease;
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.number-btn:hover {
    background: #f2b179;
    color: white;
    transform: scale(1.05);
}

.number-btn.selected {
    background: #8f7a66;
    color: white;
}

.number-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
    transform: none;
}

/* Intro Text */
.intro-text {
    max-width: 900px;
    margin: 0 auto 3rem;
    text-align: center;
}

.intro-text .page-description {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #776e65;
    margin-bottom: 0;
}

/* Game Instructions */
.game-instructions {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    max-width: 800px;
    margin: 0 auto;
}

.game-instructions h3 {
    color: #776e65;
    margin-bottom: 1rem;
    font-size: 1.5rem;
    text-align: center;
}

.game-instructions h4 {
    color: #8f7a66;
    margin: 1.5rem 0 1rem;
    font-size: 1.2rem;
}

.game-instructions p {
    color: #776e65;
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.game-instructions ul {
    list-style: none;
    padding: 0;
}

.game-instructions li {
    color: #8f7a66;
    margin-bottom: 0.8rem;
    padding-left: 1.5rem;
    position: relative;
}

.game-instructions .rules-list li:before {
    content: "❌";
    position: absolute;
    left: 0;
    color: #d32f2f;
    font-weight: bold;
}

.game-instructions .controls-list li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #4caf50;
    font-weight: bold;
}

/* About Sudoku Section */
.about-sudoku {
    padding: 80px 0;
    background: white;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-content p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #776e65;
    margin-bottom: 1.5rem;
}

/* Sudoku Tips Section */
.sudoku-tips {
    padding: 80px 0;
    background: #faf8ef;
}

.tips-intro {
    max-width: 800px;
    margin: 0 auto 3rem;
    text-align: center;
}

.tips-intro p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #776e65;
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.tip-card {
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    position: relative;
    border: 2px solid transparent;
}

.tip-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    border-color: #8f7a66;
}

.tip-number {
    position: absolute;
    top: -15px;
    left: 25px;
    background: #8f7a66;
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.2rem;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.2);
}

.tip-card h3 {
    color: #776e65;
    margin: 1rem 0 1rem;
    font-size: 1.3rem;
    font-weight: 600;
}

.tip-card p {
    color: #8f7a66;
    line-height: 1.7;
    font-size: 1rem;
    margin: 0;
}

.tips-conclusion {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    background: white;
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.tips-conclusion p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #776e65;
    margin: 0;
}

.tips-conclusion strong {
    color: #8f7a66;
}

/* Active navigation link */
.nav-link.active {
    background: #8f7a66;
    color: #f9f6f2 !important;
    padding: 0.5rem 1rem;
    border-radius: 3px;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .sudoku-grid {
        width: 350px;
        height: 350px;
        gap: 1px;
        padding: 6px;
    }

    .sudoku-cell {
        font-size: 1.2rem;
    }

    .number-keypad {
        grid-template-columns: repeat(3, 1fr);
        max-width: 250px;
        gap: 10px;
    }

    .number-btn {
        padding: 12px;
        font-size: 1.3rem;
    }

    .game-actions {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.5rem;
    }

    .action-btn {
        padding: 10px 15px;
        font-size: 0.9rem;
    }

    .btn-text {
        display: none;
    }

    .game-info {
        gap: 1rem;
    }

    .info-item {
        padding: 0.8rem 1rem;
        min-width: 80px;
    }

    .tips-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .tip-card {
        padding: 1.5rem;
    }

    .tip-number {
        width: 35px;
        height: 35px;
        font-size: 1rem;
        top: -12px;
        left: 20px;
    }

    .game-instructions {
        padding: 1.5rem;
        margin: 0 15px;
    }

    .intro-text,
    .tips-intro,
    .tips-conclusion {
        padding: 0 15px;
    }
}

@media (max-width: 480px) {
    .sudoku-grid {
        width: 300px;
        height: 300px;
    }

    .sudoku-cell {
        font-size: 1rem;
    }

    .page-title {
        font-size: 2rem;
    }

    .game-controls {
        flex-direction: column;
        gap: 1rem;
    }

    .difficulty-selector {
        flex-direction: column;
        text-align: center;
    }

    .game-instructions {
        padding: 1.5rem;
        margin: 0 15px;
    }

    .tips-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .tip-card {
        padding: 1.2rem;
        margin: 0 10px;
    }

    .tip-card h3 {
        font-size: 1.1rem;
    }

    .tip-number {
        width: 30px;
        height: 30px;
        font-size: 0.9rem;
        top: -10px;
        left: 15px;
    }

    .intro-text .page-description {
        font-size: 1rem;
        padding: 0 10px;
    }

    .tips-conclusion {
        margin: 0 10px;
        padding: 1.5rem;
    }
}

/* Game Over Modal */
.game-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.game-modal.show {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: white;
    padding: 3rem 2rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    max-width: 400px;
    width: 90%;
}

.modal-content h2 {
    color: #776e65;
    margin-bottom: 1rem;
    font-size: 2rem;
}

.modal-content p {
    color: #8f7a66;
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.modal-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.modal-btn {
    padding: 12px 24px;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.modal-btn.primary {
    background: #8f7a66;
    color: white;
}

.modal-btn.secondary {
    background: transparent;
    color: #8f7a66;
    border: 2px solid #8f7a66;
}

.modal-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}