/* リセット */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: Arial, sans-serif;
    background-color: #e6f7e0;
    color: #333;
    text-align: center;
}

header {
    margin-top: 20px;
}

h1 {
    font-size: 2rem;
    margin-bottom: 10px;
}

#menu {
    margin: 20px auto;
    padding: 10px;
    border: 1px solid #ccc;
    background-color: #fff;
    width: 80%;
    max-width: 500px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.menu-section {
    margin-bottom: 15px;
}

.menu-section h2 {
    font-size: 1.2rem;
    margin-bottom: 10px;
}

label {
    margin-right: 10px;
}

#start-btn {
    padding: 10px 20px;
    background-color: #4caf50;
    color: #fff;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

#game-area {
    margin: 20px auto;
    width: 80%;
    max-width: 800px;
    position: relative;
}

#text-line {
    height: 50px;
    background-color: #fff;
    border: 1px solid #666;
    line-height: 50px;
    font-size: 1.5rem;
    overflow: hidden;
    margin-bottom: 10px;
}

#cards-container {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
}

.card {
    width: 120px;
    height: 160px;
    border: 2px solid #999;
    cursor: pointer;
    background-color: #fff;
    transition: transform 0.2s;
}

.card img {
    width: 100%;
    height: 100%;
}

.card:hover {
    transform: scale(1.05);
}

#score-board {
    margin-top: 10px;
    font-size: 1.5rem;
    font-weight: bold;
}

footer {
    margin: 20px 0;
    font-size: 0.8rem;
    color: #555;
}