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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.game-container {
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    padding: 20px;
    max-width: 700px;
    width: 100%;
}

.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid #eee;
}

.game-title {
    font-size: 24px;
    font-weight: bold;
    color: #333;
}

.level-info {
    font-size: 18px;
    color: #666;
}

.level-info span {
    color: #667eea;
    font-weight: bold;
}

.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #f0f0f0;
    color: #333;
}

.btn-secondary:hover {
    background: #e0e0e0;
}

.btn-outline {
    background: transparent;
    border: 2px solid #667eea;
    color: #667eea;
}

.btn-outline:hover {
    background: #667eea;
    color: white;
}

.game-main {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.game-boards {
    display: flex;
    gap: 30px;
    flex-wrap: wrap;
    justify-content: center;
}

.puzzle-board,
.preview-board {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.puzzle-board h3,
.preview-board h3 {
    font-size: 16px;
    color: #666;
}

.puzzle-container {
    background: #f8f8f8;
    border-radius: 12px;
    padding: 10px;
    display: flex;
    justify-content: center;
}

.preview-container {
    background: #f8f8f8;
    border-radius: 12px;
    padding: 10px;
    display: flex;
    justify-content: center;
}

#puzzle-canvas {
    border-radius: 8px;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

#preview-image {
    max-width: 280px;
    max-height: 280px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: #eee;
    border-radius: 4px;
    overflow: hidden;
    margin-top: 10px;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #4CAF50, #8BC34A);
    border-radius: 4px;
    transition: width 0.3s ease;
}

.game-info {
    display: flex;
    gap: 30px;
}

.info-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
}

.info-icon {
    font-size: 24px;
}

.info-label {
    font-size: 12px;
    color: #888;
}

.info-value {
    font-size: 18px;
    font-weight: bold;
    color: #333;
}

.game-controls {
    margin-top: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
}

.action-btns {
    display: flex;
    gap: 10px;
}

.tips {
    background: #fff3e0;
    border-radius: 8px;
    padding: 10px 20px;
    text-align: center;
}

.tips p {
    font-size: 13px;
    color: #ff9800;
    margin: 0;
}

.message-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.message-overlay.show {
    opacity: 1;
    visibility: visible;
}

.message-content {
    background: white;
    border-radius: 20px;
    padding: 40px;
    text-align: center;
    transform: scale(0.8);
    transition: transform 0.3s ease;
}

.message-overlay.show .message-content {
    transform: scale(1);
}

.message-icon {
    font-size: 64px;
    margin-bottom: 15px;
}

.message-title {
    font-size: 28px;
    font-weight: bold;
    color: #333;
    margin-bottom: 10px;
}

.message-text {
    font-size: 16px;
    color: #666;
    margin-bottom: 15px;
}

.message-stars {
    font-size: 32px;
    margin-bottom: 20px;
}

@media (max-width: 768px) {
    .game-container {
        padding: 15px;
    }

    .game-header {
        flex-direction: column;
        gap: 10px;
    }

    .game-boards {
        flex-direction: column;
        gap: 15px;
    }

    .game-info {
        gap: 20px;
    }

    .action-btns {
        flex-wrap: wrap;
        justify-content: center;
    }

    .btn {
        padding: 8px 16px;
        font-size: 13px;
    }

    #preview-image {
        max-width: 200px;
        max-height: 200px;
    }
}