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

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

.container {
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    max-width: 800px;
    width: 100%;
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 30px;
    font-size: 2.5em;
}

h2 {
    text-align: center;
    color: #555;
    margin-bottom: 25px;
    font-size: 1.3em;
}

/* 入力セクション */
.input-section {
    width: 100%;
}

.input-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    margin-bottom: 30px;
}

.input-grid input {
    padding: 15px;
    font-size: 1em;
    border: 2px solid #ddd;
    border-radius: 8px;
    transition: all 0.3s;
    text-align: center;
}

.input-grid input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 10px rgba(102, 126, 234, 0.3);
}

.input-grid input::placeholder {
    color: #aaa;
}

/* ボタン */
.btn {
    width: 100%;
    padding: 15px;
    font-size: 1.2em;
    font-weight: bold;
    color: white;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.btn:active {
    transform: translateY(0);
}

/* ビンゴカードセクション */
.bingo-section {
    width: 100%;
}

.bingo-card {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 30px;
    aspect-ratio: 1;
}

.cell {
    background: white;
    border: 3px solid #333;
    border-radius: 15px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.2em;
    font-weight: bold;
    color: #333;
    text-align: center;
    padding: 20px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: all 0.3s;
    word-wrap: break-word;
    word-break: break-word;
    line-height: 1.4;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}

.cell:hover:not(.punched) {
    transform: scale(1.05);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
}

/* マスを開けた時のスタイル */
.cell.punched {
    background: #000;
    color: #fff;
}

/* レスポンシブ対応 */
@media (max-width: 600px) {
    .container {
        padding: 20px;
    }

    h1 {
        font-size: 1.8em;
    }

    h2 {
        font-size: 1.1em;
    }

    .cell {
        font-size: 0.9em;
        padding: 15px;
    }

    .input-grid input {
        padding: 12px;
        font-size: 0.9em;
    }
}