#oekaki-shiritori-game {
    max-width: 500px;
    margin: 20px auto;
    padding: 20px;
    border: 3px solid #f0f0f0;
    border-radius: 15px;
    background: #fff;
    font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
}

#oekaki-shiritori-game h3 {
    margin-top: 0;
    color: #333;
    text-align: center;
}

.canvas-container, .canvas-wrapper {
    margin: 15px 0;
    text-align: center;
}

#shiritori-canvas {
    max-width: 100%;
    height: auto;
    background-color: #fff;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

.input-group, .draw-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 15px;
    justify-content: center;
}

.draw-controls input[type="text"] {
    min-width: 120px;
}

#oekaki-shiritori-game input[type="text"] {
    padding: 10px;
    border: 2px solid #ddd;
    border-radius: 5px;
    flex-grow: 1;
}

#oekaki-shiritori-game button {
    padding: 10px 20px;
    background-color: #4CAF50;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-weight: bold;
    transition: background 0.3s;
}

#oekaki-shiritori-game button:hover {
    background-color: #45a049;
}

#clear-canvas {
    background-color: #f44336 !important;
}

#clear-canvas:hover {
    background-color: #da190b !important;
}

#guess-result {
    text-align: center;
    font-weight: bold;
    margin-top: 10px;
}

#word-hint {
    text-align: center;
    font-weight: bold;
    color: #ff5722;
    font-size: 1.1em;
}

.oekaki-history-list {
    margin-top: 40px;
}

.history-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
}

.history-item img {
    border-radius: 5px;
}