body {
    font-family: sans-serif;
    background-color: #f0f0f0;
    color: #333;
    text-align: center;
    padding: 20px;
}

#game-container {
    max-width: 900px;
    margin: 20px auto;
    padding: 20px;
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
}

#game-layout {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    gap: 20px;
}

#puzzle-board {
    display: grid;
    border: 2px dashed #ccc;
    background-color: #fafafa;
}

#controls {
    padding-top: 20px;
}

#check-button {
    padding: 15px 25px;
    font-size: 1.2em;
    font-weight: bold;
    cursor: pointer;
    border: none;
    background-color: #4CAF50;
    color: white;
    border-radius: 8px;
    transition: background-color 0.3s;
}

#check-button:hover {
    background-color: #45a049;
}

#message-box {
    min-height: 30px;
    margin-bottom: 15px;
    font-size: 1.1em;
    font-weight: bold;
    color: #d32f2f;
    opacity: 0;
    transition: opacity 0.5s;
}

#message-box.show {
    opacity: 1;
}

#piece-tray {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    min-height: 100px;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    margin-top: 20px;
}

.drop-zone {
    border: 1px solid #ddd;
    background-color: #e9e9e9;
}

.puzzle-piece {
    background-size: cover;
    background-position: center;
    cursor: grab;
    transition: transform 0.2s, box-shadow 0.2s;
    border: 1px solid #333;
}

.puzzle-piece:hover {
    transform: scale(1.1);
    box-shadow: 0 0 10px rgba(0,0,0,0.5);
}

.dragging {
    opacity: 0.5;
    cursor: grabbing;
}

.drag-over {
    background-color: #c8e6c9;
    border-color: #4caf50;
}

#reveal-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.85);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.reveal-content {
    text-align: center;
    color: white;
}

#final-image {
    max-width: 90vw;
    max-height: 80vh;
    border: 5px solid white;
    border-radius: 10px;
}

#reset-button, #open-image-button {
    margin-top: 20px;
    padding: 10px 20px;
    font-size: 1.2em;
    cursor: pointer;
    border: none;
    background-color: #2196F3;
    color: white;
    border-radius: 8px;
    transition: background-color 0.3s;
    margin-left: 10px;
}

#reset-button {
    background-color: #4CAF50;
}

#reset-button:hover {
    background-color: #45a049;
}

#open-image-button:hover {
    background-color: #1976D2;
}

.hidden {
    display: none !important;
}

#puzzle-board.completed {
    position: relative;
}