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

body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    margin: 0;
    padding: 20px;
    background-color: #f5f5f5;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 40px;
}

.form-section {
    background: #f5f5f5;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.form-section h2 {
    margin-top: 0;
    color: #444;
    margin-bottom: 20px;
}

.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    color: #555;
    font-weight: bold;
}

.input-group input {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
    box-sizing: border-box;
}

.input-group input:focus {
    outline: none;
    border-color: #2196F3;
    box-shadow: 0 0 0 2px rgba(33,150,243,0.2);
}

.submit-button {
    display: block;
    width: 100%;
    padding: 12px;
    background: #4CAF50;
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.3s;
}

.submit-button:hover {
    background: #45a049;
}

.error-message {
    margin-top: 20px;
    padding: 10px;
    background: #ffebee;
    color: #c62828;
    border-radius: 4px;
    text-align: center;
}

.players-list {
    background-color: white;
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.players-list ul {
    list-style: none;
}

.players-list li {
    padding: 0.5rem;
    border-bottom: 1px solid #eee;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.invite-section {
    background-color: white;
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.game-container {
    display: flex;
    gap: 20px;
    margin-top: 20px;
}

.gojuon-container {
    flex: 1;
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.gojuon-grid {
    display: flex;
    flex-direction: column;
    gap: 1px;
}

.gojuon-row {
    display: flex;
    gap: 1px;
    justify-content: center;
}

.gojuon-table {
    border-collapse: separate;
    border-spacing: 1px;
    margin: 20px auto;
}

.gojuon-table td {
    padding: 0;
    text-align: center;
}

.gojuon-button {
    width: 32px;
    height: 32px;
    font-size: 16px;
    border: 1px solid #ccc;
    border-radius: 3px;
    background-color: #fff;
    cursor: pointer;
    transition: background-color 0.2s;
    padding: 0;
    margin: 0;
    display: block;
}

.gojuon-button:hover {
    background-color: #e0e0e0;
}

.gojuon-button.used {
    background-color: #ffcdd2;
    cursor: not-allowed;
}

.gojuon-button.current {
    background-color: #c8e6c9;
}

.gojuon-section {
    flex: 1;
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    text-align: center;
}

.players-container {
    flex: 1;
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.player-item {
    margin-bottom: 20px;
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 8px;
    background: white;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.player-item.eliminated {
    background: #ffebee;
    border-color: #ffcdd2;
}

.player-item.current {
    background: #e3f2fd;
    border-color: #2196F3;
}

.answer-input {
    display: flex;
    gap: 10px;
    margin-top: 10px;
}

.answer-input input {
    flex: 1;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.answer-display {
    display: flex;
    gap: 2.5px;
    margin-top: 10px;
    justify-content: center;
    width: 100%;
    overflow-x: auto;
    padding: 5px 0;
}

.dots {
    display: flex;
    flex-direction: row;
    gap: 2.5px;
    justify-content: center;
    align-items: center;
    flex-wrap: nowrap;
}

.dot {
    width: 35px;
    height: 35px;
    min-width: 35px;
    min-height: 35px;
    border: 1px solid #ddd;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    background: white;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    flex-shrink: 0;
}

/* モーダルのスタイル */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-content {
    background: white;
    padding: 20px;
    border-radius: 8px;
    text-align: center;
}

.join-message {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    background-color: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 10px 20px;
    border-radius: 5px;
    z-index: 1000;
    animation: fadeInOut 3s ease-in-out;
}

@keyframes fadeInOut {
    0% { opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { opacity: 0; }
}